Humboldt Kolleg The Third International Conference on “Research to Applications & Markets“ September 16-18, 2016 Hammamet, Tunisia Dear Colleagues, We are very happy to welcome you and all participants to the Third International Conference on “Research to Applications and Markets” (RAM). After the success of the Second and first edition of the International Conference RAM 2013 RAM 2011, we are pleased to organize the third edition of this conference with the support of the Alexander von Humboldt foundation, Sfax University, Faculty of Sciences of Sfax. The main aim of the Research to Applications & Markets conference is to allow researchers, graduate students and engineers as well as industry to present their research activities, and hence foster research relationships between universities and industry.
The kolleg’s program includes contributions from young and juniors researchers interested in Nanosciences, Biotechnologyand Applied Mathematics and computers. We are confident that the programme and the diverse subjects will be beneficial. We look forward to hosting you in Hammamet, Tunisia.
Prof. Dr. Mohamed Ellouze Chairman https://sites.google.com/site/kolleghumboldttunisia2016//
[RAM 2016]
Page 1
Chairman: Prof. Dr. Mohamed Ellouze Faculty of Sciences of Sfax B. P. 1171-3000, Sfax, Tunisia Tel:+216 98414707/ +216 23 414707 E-mail:
[email protected]
Honorared Members: •
Dr. Andreas Reinicke, Excellency Ambassador of the Federal Republic of Germany in Tunisia.
•
Prof. Sultan Abu-Orabi, Secretary General of Association of Arab Universities, Jordan.
•
Prof. Rafik Bouaziz, President of Sfax University, Sfax, Tunisia.
•
Prof. Dia_Eddin Arafa, President of Al Al-Bayt University, Jordan.
•
Prof. Schindler Kovats, Director of the DAAD Office, Tunisia.
Main Topics: •Nanosciences: Nanodevices, Nanomaterials and their applications, Nanotechnology in electronic and robotics, Materials for energy conversion. • Mathematics and Computer Applications. • Biotechnology, Pharmacology, Biomaterials, Biophotonics and environmental application
[RAM 2016]
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Humboldt - Kolleg Research to Applications & Markets
Hammamet, Tunisia, September16-18, 2018
International Scientific Committee
H. Redjem
Algeria
S. T. Abu-Orabi
Jordan
M. S-Rahal
Algeria
A. Sidorenko
Moldova
N. Ferhat
Algeria
R. Masrour
Morocco
I. Pajeva
Bulgaria
M. Abid
Morocco
H. Omran
Egypt
E. Elizalde
Spain
A. H. Abadi
Egypt
E. Dhahri
Tunisia
M. A. Metwally
Egypt
H. Ayadi
Tunisia
H. Elkebir
France
H. Khemakhem
Tunisia
M. Bourrous
France
M. Dammak
Tunisia
H. Limbach
Germany
M. Gargouri
Tunisia
H. Seliger
Germany
S. Guermazi
Tunisia
M. Schreiber
Germany
H. Guermazi
Tunisia
P. Langer
Germany
I. Kiziroglu
Turkey
S. Lakhdar
Germany
C. Baniotopoulos
UK
H. Kricheldorf
Germany
H. Eleuch
USA
M. Moussa
Jordan
B. Hamad
USA
[RAM 2016]
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Humboldt - Kolleg Research to Applications & Markets
Hammamet, Tunisia, September16-18, 2018
Organizing Committee Prof. Mohamed Hedi Ben Ghozlen - FSS, Tunisia Prof. S. Lakhdar - CNRS Cean, France Prof. Ahmed Debez - CBBC, Tunisia Prof. H. Khemakhem- FSS, Tunisia Dr. Z. Baccar - INRAP, Tunisia Dr. A. Slimani - FSS, Tunisia Dr. R. Rekik - FSG, Tunisia Dr. Adel Benali- FSS, Tunisia N. Ben Hamad - ISBS, Tunisia M. Amine Saïda - FSS, Tunisia C. Bouzid – FSS, Tunisia
[RAM 2016]
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Conference program RAM 2016 Thursday
Friday
Saturday
Sunday
September 15, 2016
September 16, 2016
September 17, 2016
September 18, 2016
08:30
10:00
Registration
Workshop
Opening Ceremony
Coffee Break
Coffee Break
10:30
Workshop 13:00
PL 1
PL 3
PL 2
PL 4
Oral NS 1
Oral BT 1
14:30
17:00
Coffee Break
Oral NS 2
Oral M
PL 13 PL 14
PL 15
PL 20
PL 21
PL 22
PL 23
PL 24
PL 25
PL 26
PL 27
Lunch
Lunch
PL 16
PL 8 PL 9 PL 10
PL 17
08:30
Coffee Break
Oral NS 7
PL 5 PL 6 PL 7
10:00 10:30
13:00 14:30
Closing Ceremony
Oral NS 5 Coffee Break
Poster session 1
Poster session 2
Poster BT 1
PL 19
Oral NS 4
Coffee Break
Poster NS 1
PL 18
Oral NS 6
Coffee Break
Oral BT 2
17:30
19:30
PL 12
Oral NS 3
Lunch
Lunch
Workshop
PL 11
Poster NS 2
17:00 17:30
Poster M
Dinner
Dinner
Dinner
PL: PLENARY LECTURES
NS: NANOSCIENCES
BT: BIOTECHNOLOGY
19:30
M: MATHEMATICS
Humboldt - Kolleg Research to Applications & Markets
Hammamet, Tunisia, September 16-18, 2016
Program Day before the Conference: September 15, 2016 Chairmen, Prof. Hans-Heinrich Limbach, Freie Universität Berlin, Germany Prof. Henning Hopf, Technical University of Braunschweig, Germany
“Communication in Science” 18:00
Registration of the participants
20:00
Dinner
First day, September 16, 2016 8:00
Registration
8:30
Opening Ceremony • Dr. Andreas Reinicke, Excellency Ambassador of the Federal Republic of Germany in Tunisia.
• Prof. Sultan Abu-Orabi, Secretary General of Association of Arab Universities, Jordan. • Prof. Rafik Bouaziz, President of Sfax University, Sfax, Tunisia. • Prof. Dia_Eddin Arafa, President of Al Al-Bayt University, Jordan. • Prof. Schindler Kovats, Director of the DAAD Office, Tunisia: Presentation of the DAAD in Tunisia.
10:00
[RAM 2016]
Coffee break
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Humboldt - Kolleg Research to Applications & Markets
Hammamet, Tunisia, September 16-18, 2016
Oral sessions Nanosciences (10:30- 13:00) NS1 Chairman: Prof. Anatolie Sidorenko PL1
Marwan
Mousa
Field Electron Emission from MW Carbon Nanotubes and its Potential as an Electron Source
PL2
Majda
Sekkal-
Enhancing hyperpolarizabilities of organic molecules. A quantum mechanics
Rahal
study.
Moulahi
Chadia
Determination Of Thermo-Physical Properties Of A Smart Composite
Djamila
Berrezzoug First-Principles Study Of The Half-Metallic Ii-N Compounds
Houda
Djebbar
First-Principles Study Of The Half-Metallic I-N Compounds
Asma
Bouabca
Half-Metallicy And Fully Compensated Ferrimagnetism In Cr Ba P Alloy
Ilhem
Zouari
Structural And Ferroelectric Properties Of Er Doped Bctyn Ceramics
Intissar
Ghamgui
Structural And Ferroelectric Properties Of ErO2 Doped Nbzt Ceramics
Ziyad
Yahiaoui
Synthesis And Optical Spectroscopy Of Eu
3+
Ions In YpO4 For Orange-Red
Phosphors Soltani
Sonia
Time-Resolved Photoluminescence Studies Of AlxGa1-Xn/Gan Epitaxial Films Grown On Sin Surface-Treated Sapphire Substrate By AtmosphericPressure MOVPE
Biotechnology (10:30- 13:00) BT1 Chairman: Prof. Fathy Abdelrazek PL3 Ahmed
Mazzah
Grafting of Amine Functions on Cellulose Acetate
PL4 Ashraf
Abadi
Intellectual Property of New Antiviral Medications
Ali
Performance of Two Underground Cooling Systems in Hot Arid Areas
Muhammed
Alzweiri
Targets for weight lossing
Najeh
Tka
Optically Pure Key-precursors From Natural Amino Acids, Synthesis and
Ahmed Hamza
Invesigation in Cyclization Reactions. Ben Yahia
Mohamed Modeling Of Adsorption Isotherms Of Lithium Chloride On A Thin Layer Of Hepta-Hélicènes By Statistical Physics Formalism
Ben Amar
Cheba
The Laser Technology For Fast Growing Biotechnology (An Overview)
Hamada
Elsayed
Extensive management of field margins enhances their potential for off-
Ali
site soil erosion mitigation
Zouaghi
Seasonal variation of the essential oil of fraxinus angustifolia vahl and its
Nafila
antimicrobial properties
13:00
[RAM 2016]
Lunch
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Humboldt - Kolleg Research to Applications & Markets
Hammamet, Tunisia, September 16-18, 2016
Nanosciences (14:30- 17:00) NS2 Chairman: Prof. Henning Hopf Charalampos Baniotopoulos
Wind Energy Technology Reconsideration to Enhance the Sustainability Features of Smart Cities
Hatem
Bentaher
Energetic Efficienty of a PVTSolar Drier
Lakhal
Amira
Modeling Of The Time Of Pricking In A Company Of Clothing
Tarak
Kallel
Studies of optical centers occupied by Erbium ions in AlN NPs
Aida
Benchaabane
Effect Of Cdse Nanoparticles Incorporation On The Performance Of P3Ot Organic Photovoltaic Cells
Nefzi
Chaima
Effect Of Gamma Radiations On Structural And Optical Properties Of Iron Doped Indium Oxide Thin Films
Slah
Hlali
Electrical Characteristics Of Metal-Isolant-Semiconductor (Mis) NanoDevice
Mohsen
Mhadhbi
Fabrication Of Nanocrystalline Ticrc Powders By Mechanical Alloying
Tarek
Hidouri
Impact Of Temperature Coupled With The V/Iii Ratio Variation And LSE Modelization Of The Exciton Transfer Between Localized States Of BxGa1-XAs/GaAs Epilayers
Hazem
Bouhamed
Improved Solid Oxide Fuel Cell Performance With Nanostructured Electrolytes.
Chatbouri
Samir
Interface Traps Effect On The Charge Storage Characteristics In Metal Oxide Semiconductor Structures Based On Silicon Nanocrystals
Biotechnology (14:30- 17:00) BT2 Chairman: Prof. Ashraf Abadi PL5
Heinz
Seliger
Some New Research on the Biomedical Application of Nucleic Acids
Hartmut PL6
Fathy
Abdelrazek Synthesis of Some Novel 1,4-phenylene-bis- Heterocyclic Compounds of Biological Interest
PL7
Mohamed
Zaghloul
Organisational redesign for research-based learning (SATIS)
PL8
Helmy
Omran
“Controlling some Native (Endogenous) Enzyme activities in Plant Foods”
PL9
Allal
Ghanmi
Analytic properties of generalized class of complex Hermite polynomials
Al-Hiari
Novel
PL10 Yusuf
heterocyclic
carboxamide
derivatives
as
potential
antihyperlipidaemic Agents: On Plasma Lipid Profile of Triton-WR-1339Induced Wistar Rats
Dalel
Belhaj
Oxidative stress induced by 17β-estradiol exposure in the Invertebrate Species Eisenia fetida
[RAM 2016]
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Humboldt - Kolleg Research to Applications & Markets
Hammamet, Tunisia, September 16-18, 2016 Houda
Bey
Structure and Dynamics of Complex Coacervates between Lysing enzyme from Trichoderma harzianum and poly allylamine hydrochloride
Mohammad Harb
[FeFe] Hydrogenase Models Containing Different Length Diselenolato Bridging Moieties
17:00
Coffee break
17:30
Poster Session NS1 and BT1
19:30
Dinner
Second day, September 17, 2016 Nanosciences (08:30- 10:00) NS3 Chairman: Prof. Marwan Mousa PL11 Azzedine Malek
Bendounan
Silicene, a promising new 2D materiel for science and nanotechnology
Fouzai
Mesogenic Propreties Of Two Supramolecular Liquid Crystals Induced By Intermolecular Hydrogen Bonding
Abdelghaffar Nasri
Modeling of Molecular Field Effect Transistor
Amine
Touati
Si-Single Electron Transistor Model
Baligh
Touati
Structural And Optical Characterization Of Pbs Thin Films Doped With Cd
Salah
Khalil
Structural, Electrical And Optical Properties Of Mgpc Doped H2O2 Thin Films Deposited By Spin Coating Method
Héla
Chamroukhi Synthesis And Characterization Of Hybrid Thin Films Based On Polyaniline (Pani)-Nanoparticles
Imen
Ammar
Synthesis And Characterization Of Tin Sulphide Chalcogenide Nanoparticles: Influence Of Reactants On The Chemical Composition
Rafika
Hamdi
Theoretical Investigation Of The Strontium Metal Solvated In A Xenon Complex
Karim
Affes
Thermal properties of a spin crossover nanoparticle investigated with an electro elastic model
Rim
Ben Brahim X-Ray Diffraction Patterns Of Nanoporous Silicon: Simulation Study
Rihab
Ben Ayed
Influence of iron concentration on the physical properties of sprayed Fe2O3 thin films
Aliani
Chedia
Effect Of The Rear Contact And Intrinsic Thin Layer On The Parameters Of N(A-Si:H)/I(A-Si:H)/P(C-Si) Heterojunction Solar Cells
[RAM 2016]
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Humboldt - Kolleg Research to Applications & Markets
Hammamet, Tunisia, September 16-18, 2016
Mathematics and Computer Applications (08:30- 10:00) M Chairman: Prof. Mohamed Ali Hammami PL12 Ihsen Latifa
Yengui
Algorithms for multivariate polynomials and applications
Debbi
Fractional stochastic Burgers Equation type in Hölder space Existence, Uniqueness and approximations-
Saliha
Hichar
Study of a semi linear elliptic problem from a nonlinear integral equation: Applications to a problem of Electrostatic
Raja
Rabhi
Lattice Boltzmann Method For Simulation Of Entropy Generation For An Axisymmetric Mhd Flow Under Thermal Non-Equilibrium In Porous Micro Duct
Laiadi
Abdelkader
Free surface flow over a multiple obstacles
Lotfi
Boudjenah
Optimal Control Of Non Linear Systems With Delay
Daoud
Houcem
Pseudospectra Of Linear Relations
Abbes
Rabhi
Recursive Estimation Of Conditional Risk Function
Safa
Bhar Layeb
Solving A Tree Network Design Problem To Optimality
Rabi
Rabi
A Theoretical
Investigation Of Spatial Distribution Of Radon In A
Typical Ventilated Room Ben Nasser Bacem
On uniform exponential stabilizability of some nonlinear dynamics on non uniform time domains
Slim
Chelly
Some Perturbation Results Of Relatively Weakly Demicompact Operators
Djemoui
Lalmi
Predictions of Isothermal Fuel-Air Mixing in a Dual-Swirl Gasturbine Combustor
10:00
Coffee break
Nanosciences (10:30- 13:00) NS4 Chairman: Prof. Bothina Hamad PL13 Peter
Langer
PL14 Yassen
Al-Soud "Design and Synthesis of Novel 1,2,4-Triazoles as Non-Steroidal Inhibitors of
New Anti-Cancer Agents Synthesis based on Red, Blue and Yellow Sugars
17-beta Hydroxysteroid Dehydrogenase Type 2" PL15 Mohammad El-
Substitution Reactions of Organoiron mono-, bi- and trithiocarbonate
khateeb Complexes Houcem
Kchaou Characterization Of The Phase Transition Of [(Ch3)3Nh]CdCl3 Compound
Sondes
Hajlaoui Synthesis,
structural
accomplished
with
characterization DFT
calculation
and of
vibrational the
spectroscopy
organic-inorganic
[(C3H7)4N][SnCl5(H2O)].2H2O compound
[RAM 2016]
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Humboldt - Kolleg Research to Applications & Markets
Hammamet, Tunisia, September 16-18, 2016 Jedli
Hedi
Adsorption Of Super Critique Co2 On Various Clays: Isotherm, And Kinetic Study
Rouis
Wiem
Direct Photocurrent Mapping Of Inorganic InAs/InGaAs/GaAs Solar Cell Using A Near-Field Scanning Optical Microscopy
Elwej
Rim
Hydrothermal synthesis, Characterization by single crystal XRD, structural discussion and electric, dielectrical properties of (C6H9N2)2(Hg0.12Zn0.88)Cl4 hybrid compound
Ahmad
Al-
Environmentally Safe Oxidants using H2O2 and O2 Catalyzed by Transition
Ajlouni
Metals
13:00
Lunch
Nanosciences (14:30- 17:00) NS5 Chairman: Prof. Redjem Hadef PL16 Anatolie Sidorenko
Functional Nanostructures for Microelectronics of 21st Century
PL17 Bothina
Hamad
Material design for thermoelectric energy harvesting
Amouri
Evidence
Amira
of
magnetoelectric
0.1Ba[Ti0.95(Yb0.5Nb0.5)0.05]O3
coupling
in
0.9BiFeO3-
ceramic
Imen
Djemel
Electrocaloric Effect Of BSTZ Ceramics
Turki
Olfa
The Samarium effects on dielectric, piezoelectric and ferroelectric properties in NBT-6BT
Farhat
Mizouri
Dielectric and magnetic properties of (1-x) BiFeO3-x (Ba0.9Ca0.1Ti0.9Sn0.1)O3 new multiferroic ceramics
Manel
Houda
Ben
Structural And Ferroelectric Properties Of BCTZ Ceramics Prepared By
Abdessalem
Solid State
Zaghouene
Electrocaloric
Effect
Of
Lead-Free
(Ba0.95Ca0.05)0.8875Bi0.075TiO3
Ferroelectric Ceramic Manel
Missaoui
Preparation
of
(1-x)
BiFeO3/x[(BaTiO3)(1-y)/(NaNbO3)y]
multiferroïc
ceramics Mourad
Smari
Correlation Between Structural, Magnetic And Electric Properties Of La0.5Ca0.3Te0.2MnO3 Based On The Study Of The Critical Behavior
17:00
Coffee break
17:30
Poster Session 2 (NS2 and M)
19:30
Dinner
[RAM 2016]
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Humboldt - Kolleg Research to Applications & Markets
Hammamet, Tunisia, September 16-18, 2016
Third day, September 18, 2016 Nanosciences (08:30- 10:00) NS6 Chairman: Prof. Yaseen Al-Soud PL18 Michael
Schreiber
Self-assembly of ferromagnetic colloidal particles - stirrers and movers actuated by oscillating fields
PL19 Hichem
Eleuch
Population transfer and pulse propagation in atomic media
PL20 Ahmad
Telfah
Real time Investigations of living cancer cells by using Nuclear Magnetic Resonance (NMR) based on planar waveguide NMR detector
PL21 Marian
Jaskula
Nanoporous oxide layers as potential drug delivery systems
Rachid
Masrour
Modeling Of The Magnetocaloric Effect In Ni2Mnga Materials
Rihab
Hamdi
Magnetic Memory Effect In Dy0.5(Sr0.7Ca0.3)0.5MnO3 Manganites
Kheyria
Sbissi
New Complex Magnetic Materials For An Application In Refrigerator
Fares
Ben
Magnetocaloric Effect And Magnetic Properties Of La0.67Ba0.22Sr0.11CoO3
Jemaa
Perovskite Oxide
Safwen
Investigation of magnetic phase transition and dielectric properties of ceramic
Elkossi
system La0.7Sr0.25Na0.05Mn0.9Al0.1O3
10:00
Coffee break
Nanosciences (10:30- 13:00) NS7 Chairman: Prof. Peter Langer PL22 Abdelkader
Souifi
Nanostructure-based
Resistive
Random-Access
Memories
for
3D
Access
to
integration PL23 Abdelghani
Adnane
Nanosensors: State of the Art and Perspectives
PL24 Sami
Lakhdar
Metal-Free,
Visible
Light-Mediated
Straightforward
Benzo[b]phosphole Oxides: Synthetic and Mechanistic Studies PL25 Redjem
Hadef
Predictions of Isothermal Fuel-Air Mixing in a Dual-Swirl Gas turbine Combustor
PL26 Mostefa
Belkhatir
Laboratory Study into the Effects of Initial Conditions on the Mechanical Behavior of Over consolidated Granular Sandy Soils
Lotfi
Belkhiri
The contribution of the DFT modeling to the electronic structure and magnetic properties of actinide molecular compounds
Mahmoud
Abdel-Aty
Entanglement Engineering of Many Atoms with Nanoresonators
Mohamed
Zaineb
Effect of iron on the structural, magnetic and magnetocaloric properties of La0.67Sr0.16Ca0.17MnO3 (LSCMO) manganite.
[RAM 2016]
Page 12
Humboldt - Kolleg Research to Applications & Markets
Hammamet, Tunisia, September 16-18, 2016 Mohammed Shabat PL27 Samir
El Zein
New artificial materials for solar cell and sensors Daily Stock Select, an online artificial platform for testing stocks trading strategies.
Arwa
Belkahla
Crystal
structure
and
electrical
properties
of
In-doped
La0.7Bi0.05Sr0.15Ca0.1Mn1-xInxO3 manganites Tarek
Hidouri
Localized State Exciton model investigation of B-content effect on optical properties of BGaAs/GaAsepilayers grown by MOCVD
13:00
Lunch
14:00
Poster Session
14:30
Closing Ceremony
[RAM 2016]
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Humboldt - Kolleg Research to Applications & Markets
Hammamet, Tunisia, September 16-18, 2016
Plenary lectures PL1
Jordan
Marwan
Mousa
Field Electron Emission from MW Carbon Nanotubes and its Potential as an Electron Source
PL2
Algeria
Majda
Sekkal-Rahal
Enhancing hyperpolarizabilities of organic molecules. A quantum mechanics study.
PL3
France
Ahmed
Mazzah
Grafting of Amine Functions on Cellulose Acetate
PL4
Egypt
Ashraf
Abadi
Intellectual Property of New Antiviral Medications
PL5
Germany Heinz
Seliger
Some New Research on the Biomedical Application of
Hartmut PL6
Egypt
Fathy
Nucleic Acids Abdelrazek
Synthesis of Some Novel 1,4-phenylene-bis- Heterocyclic Compounds of Biological Interest
PL7
Egypt
Mohamed
Zaghloul
OrganiSATional redesIgn for reSearch-based learning (SATIS)
PL8
Egypt
Helmy
Omran
“Controlling some Native (Endogenous) Enzyme activities in Plant Foods”
PL9
Morocco Allal
Ghanmi
Analytic properties of generalized class of complex Hermite polynomials
PL10 Jordan
Yusuf
Al-Hiari
Novel heterocyclic carboxamide derivatives as potential antihyperlipidaemic Agents: On Plasma Lipid Profile of Triton-WR-1339-Induced Wistar Rats
PL11 France
Azzedine
Bendounan
Silicene, a promising new 2D materiel for science and nanotechnology
PL12 Tunisia
Ihsen
Yengui
Algorithms for multivariate polynomials and applications
PL13 Germany Peter
Langer
New Anti-Cancer Agents Synthesis based on Red, Blue and Yellow Sugars
PL14 Jordan
Yassen
Al-Soud
"Design and Synthesis of Novel 1,2,4-Triazoles as NonSteroidal
Inhibitors
of
17-beta
Hydroxysteroid
Dehydrogenase Type 2" PL15 Jordan
Mohammad El-khateeb
Substitution Reactions of Organoiron mono-, bi- and trithiocarbonate Complexes
PL16 Moldova
Anatolie
Sidorenko
Functional Nanostructures for Microelectronics of 21st Century
PL17 USA
Bothina
PL18 Germany Michael
Hamad
Material design for thermoelectric energy harvesting
Schreiber
Self-assembly of ferromagnetic colloidal particles stirrers and movers actuated by oscillating fields
PL19 USA
[RAM 2016]
Hichem
Eleuch
Population transfer and pulse propagation in atomic
Page 14
Humboldt - Kolleg Research to Applications & Markets
Hammamet, Tunisia, September 16-18, 2016 media PL20 Germany Ahmad
Telfah
Real time Investigations of living cancer cells by using Nuclear Magnetic Resonance (NMR) based on planar waveguide NMR detector
PL21 Poland
Marian
Jaskula
“Nanoporous oxide layers as potential drug delivery systems”.
PL22 France
Abdelkader Souifi
Nanostructure-based
Resistive
Random-Access
Memories for 3D integration PL23 Tunisia
Abdelghani Adnane
Nanosensors: State of the Art and Perspectives
PL24 France
Sami
Metal-Free,
Lakhdar
Visible
Light-Mediated
Straightforward
Access to Benzo[b]phosphole Oxides: Synthetic and Mechanistic Studies PL25 Algeria
Redjem
Hadef
Predictions of Isothermal Fuel-Air Mixing in a Dual-Swirl Gasturbine Combustor
PL26 Algeria
Mostefa
Belkhatir
Laboratory Study into the Effects of Initial Conditions on the Mechanical Behavior of Over consolidated Granular Sandy Soils
PL27 Lebanon Samir
El Zein
Daily Stock Select, an online artificial platform for testing stocks trading strategies.
[RAM 2016]
Page 15
Humboldt - Kolleg Research to Applications & Markets
Hammamet, Tunisia, September 16-18, 2016
Poster Session 1, September 16, 2016 (17:30) Nanosciences (NS1) 1
Hadj
Baltach
Ab Initio Investigation Of Structural, Electronic And Magnetic Properties Of Tbni5 Compound
2
Radjaa
Benabboun
Etude Ab-Initio Des Propriétés Structurales, Électroniques Et Magnétique Des Composés Semi-Heusler De Type Xyz (Kbab Et Rbbab ) Avec La Gga Et La Tb-Mbj
3
Imane
Khelladi
Etude quantique des dérivés de tétracène et de pentacène
4
Imen
Rais
Etude structurale et magnétique des matériaux multiferoiques dopés
5
Bouayad
Meriem
Ferrocene As Bulky Functional Group In Glucopyranosides. Structural and energetical structures computations using dft methods.
6
Younes
Menni
Numerical Study Of Turbulent Forced-Convection Flow In A Channel With In-Line Baffles Of Various Shapes
7
Abdelkader
Elhorri
Miloud 8
Zouaoui
Theoretical
Investigation
Of
Derivatives
Benzene,
Stilbene
And
Diphenylacetylene. Structure And Nlo Properties. Mourad
Theoretical Study On Nonlinear Optical Properties And Electronic Spectra Of Pyrène Π –Conjugated In Push-Pull Molecules With DFT And Ab Initio
Rabah
Calculations. 9
Moncef
Ati
Thermodynamic Behavior Of Spin System Using Molecular Dynamcis.
10
Zakaria
Elaoud
Phase Transition And Electrical Properties In 4-Benzylpiperidinium Tetraoxoselenate Monohydrate
11
Abir
Nasri
Magnetic Entropy Changes Of Pr0.6Sr0.4MnO3 Compound.
12
Benmalem
Yasmina
Structural, Electronic And Thermal Properties Of The Cubic AntiperovskiteType GenCa3
13
Karima
Bendahou
Synthesis Of Mesoporous Chromium Silicates
14
Sabria
Terkhi
The Laser Wavelength Emitted By The Random Trimer Barrier Superlattices
15
Amrani
Bedia
The
Structural,
Elastic
And
Electronic
Properties
Of
Lutatium-
Monopnictides (Lun, Lup). 16
Rahmoune
Mohammed Theoretical Investigation Of The Electronic Structures And Magnetic Properties Of The Y-Based Quaternary Heusler Alloys
17
Jamila
Dhiflaoui
2+
+
Theoretical Study Of AlK Rg And AlK Rg (Alk=Be, Mg, Sr And Rg=He, Ar, Kr)
18
Benhamza
Hocine
19
Mohammedi Mohammed Electronic structure, magnetism and robust half-metallicity of new CoWalid
[RAM 2016]
Thermal Conductivity Modeling Of Oxide-Water Nanofluids Using “Jmp”
based quaternary Heusler alloys
Page 16
Humboldt - Kolleg Research to Applications & Markets
Hammamet, Tunisia, September 16-18, 2016 20
Imen
Saïdi
Band parameters of AlInAs/AlGaAsquantum dots: electronic properties study
21
Aymen
Bouali
Graphene based gas sensor
22
Fatima
Bendahma
Structural Parameters And Their Effect On The Electronic Transport Properties In Aperiodic Profile Superlattice
23
Ali
Hafs
Effect Of Cu Addition On Thermal Stability And The Glass Forming Ability In Fe–Nb–B–Si Bulk Glassy Alloy
24
Redjem
Hadef
Characterization of Turbulent Sooting Flame using Advanced Laser Diagnostics
25
Said
Chikha
Implementation of direct predictive control of variable speed wind energy conversion system based on DFIG
Biotechnology (BT) 1
Amel
Touilsag
Conformational Study Of Β-D-Neocarrabiose In Explicit Solvant
2
Chafika
Zidani
Design And Investigation Of A Conical Solar Furnace Powered By Optical Fibers
3
Fatma
Djilani
Etude Des Transfert De Charges Dans Les Molécules Conjuguées Par Les
Kobibi
Méthodes De Chimie Quantiques Hyperpolarizabilities Of Phenyl Amine Derivatives
4
Sabrina
Boualem
5
Nour El
Bensiradj Theoretical And Spectroscopic Study Of Zn(Ii) And Cd(Ii) Complexs Of Type[
Houda
M(Te Ph)2 ][Tmeda ]By Dft And Tddft
6
Naouel
Bouregba Wastewater Treatment System By O3 (Wwtp Of Mascara West Of Algeria)
7
Radhia
Fourati
Characterization of fluoride and lead accumulation in polluted soil in an industrial zone in Sfax city during two critical periods.
8
Soufiane
Bentout
Global Analysis Of Infection And Latency Ages Model With Non Linear Incidence Rates
9
Ibtissem
Missaoui
How Corruption Affects The Soundness Of Islamic Banks?
10
Natalia
Kulikova
Classical Languages In Medical And Legal Terminological Systems
11
Jihene
Jerbi
Computational study of the cytosine derivatives during demethylation process
12
Ahmed
Debez
Genetic variation for response to salt stress in parental genotypes of Medicago truncatula recombinant inbred lines
13
Dalal
Harkati
A theoretical investigation of reactivity and regioselectivity of Hydantoin and derivatives
14
Nadjib
15
Mohamed El-Deab
Ferhat
At the origin of the Maghreb populating Electrocatalysis by nanoparticles: Enhanced oxidation of formic acid at binary metal/metal oxide nanoparticles-modified electrodes
[RAM 2016]
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Hammamet, Tunisia, September 16-18, 2016
Poster Session 2, September 17, 2016 (17:30) Nanosciences (NS 2) 1
Fatma
Ben Slama Electrical proprieties of ITO/PCDTBT:Graphene/Al organic device
2
Saad
Ali
Polypyrrole/Ag/mesoporous silica nanocomposites: design by in situ UVinduced polymerization and antibacterial activity
3
Ali
Hafs
Investigation Of Glass Forming Ability, Crystallization Kinetics And Magnetic Properties Of Melt-Spun Fe72-XNb4B20Si4Cux Amorphous Alloys (X = 0, 2) In The Form Of Ribbons
4
Afaf
Gadalla
The size effect of core/shell semiconductors nanoparticle via optical properties
5
Sami Erchidi Elyacoubi
Magnetocaloric Effect in SmFe1-xMnxO3 perovskite
6
Lilia
Optical and Ac conductivity on heavely Zr-doped Mn3O4 thin films for
Ben Said
optoelectronic applications 7
Khadoudj
Guessoum Synthèse chimiques et caractérisation structurale des produits de corrosion des nouveaux alliages Zinc-terre rare.
8
9
Mohammedi
Gheriballah
Mohamed
A First-Principle Study On The Properties Of A New Series Of Quaternary
Walid
Heusler Alloys.
Slimane
A First-Principles Study Of Half-Metallicity And Magnetic Properties Of FullHeusler Alloys Zr2CrX (X = Ga, In)
10
Abdelkader
Hlel
Acceptor/Donor End Capped Phenylene-Thiophene Co-Oligomers Toward Efficiencies Organic Electronic Devices
11
Chahed
Abbes
Effect Of Doping And Pressure On The Magnetic Properties For Co-Based Quaternary Heusler Alloy.
12
Dorria
Fatnassi
Effect Of Iron On Magnetic And Magnetocaloric Properties Of La0.8Ca0.2Mn1XFexO3
13
Yamina
Sefir
Effect Of The Structural Parameters On Subbands Of Fibonacci AlxGa1XAs/GaAs
14
Nouara
Massout
Superlattices
Étude Dft: Calcul Des Constantes De Vitesse Des Équilibres Tautomères Du Médicament "Imexon"
15
Noureddine
Yousfi
Heterocyclic
Nonlinear
Optical
Chromophores
Composed
Of
Changes
In
Dicyanoimidazol 16
Rim
Cherif
Magnetic
Transition
And
Magnetic
Entropy
La0.6Pr0.1Ba0.3Mn0.9Fe0.1O3 17
Iskander
Walha
Magnetocaloric And Critical Behavior In The La0.6Ca0.3
0.1MnO3
Manganese
Oxide 18
Hayet
Moumeni
Nanostructured Fe Powders: Structure And Thermal Properties
19
Abderrafik
Nemamcha Production Of Palladium Nanoparticles/Silica Nanocomposite For Water Purification
[RAM 2016]
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Humboldt - Kolleg Research to Applications & Markets
Hammamet, Tunisia, September 16-18, 2016 20
Souhir
Mseddi
Propagation Of Bleustein-Gulyaev Waves In Piezoelectric Bst Layered Structures
21
Nasser
Chelouah
The effect of the addition of ground olive stones on the physical and mechanical properties of clay bricks
22
Imen
Saidi
Origin of indirect optical transitions in Al0.45In0.55As/Al0.66Ga0.34As quantum dots
23
Bahroune
Moufida
Corrosion behaviour of dc magnetron sputtered aluminium coatings
24
Yasser
Belkacem
Control of the Wind Power Generation using Doubly Fed Induction Generators
25
26
Mohamed
Ben
Influences Of Anisotropy On Band Gaps Of 2d Phononic Crystal With
Hedi
Ghozlen
Hexagonal Inclusions
Mousa
Al-Noaimi
Ruthenium (II) diamine complexes incorporating azoimine ancillary ligands. Synthesis, spectral, crystal structure and DFT calculations and catalytic activity in the hydrogenation of α,β-unsaturated aldehyde
Mathematics and Computer Applications (M) 1
Meriem
Djenaoui
A Mollification Method For A Cauchy Problem For The Laplace Equation
2
Firouz
Belmechri
Equation Integral Dans Les Espaces Fonctionelles
3
Mohamed
Houas
Existence Of Solutions For Fractional Differential Equations Involving Two Fractional Orders
4
Noureddine
Bahri
La Compacité Du Résolvante Pour L'Opérateur De Schrödinger Avec Champ Magnétique
5
Khemisti
Akmoum
Modeling Of Amorphization Kinetics In Sic Under Ion Implantation
6
Salah
Frioui
Simulation Of Multi-Stage-Flash Plant And Development Of A DataProcessing Program
7
Abdessamad Sekkal
Structural And Thermo-Elastic Properties Of The Ercu, Erag, Erau Dycu, Ndag, Lacd And Yin Intermetallics Compounds: Ab-Initio Calculation Analyzed With Data Mining Approach.
8
9
10
Mountassir
Nizar
Aicha
Hamdi
The Homotopy Perturbation Method For Solving Some Differential
Cherif
Equations.
Ben
ROI Selection of Breast cancer Microcalcifications Based Morphologic
Hamad
Operation and Mixture Parametric Distributions
Boussaha
A New Modified Scheme For Linear Shallow-Water Equations With Distant Propagation Of Irregular Wave Trains Tsunami Dispersion Type For Inviscid And Weakly Viscous Fluids
11
Dalal
Hachelfi
12
Nouioua
Tarek
[RAM 2016]
Trust Region With Conjugate Gradient Algorithms For A Class Of Nonlinear Optimization Interest Of Gpus Architecture For Accelerating Iterative Reconstruction Methods
Page 19
Humboldt - Kolleg Research to Applications & Markets
Hammamet, Tunisia, September 16-18, 2016
ABSTRACTS
Plenary lectures and Oral PRESENTATION
[RAM 2016]
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Humboldt - Kolleg Research to Applications & Markets
Hammamet, Tunisia, September 16-18, 2016
Nanosciences (NS1) PL1
Marwan
Mousa
Field Electron Emission from MW Carbon Nanotubes and its Potential as an Electron Source
PL2
Majda
Sekkal-
Enhancing hyperpolarizabilities of organic molecules. A quantum mechanics
Rahal
study.
Moulahi
Chadia
Determination Of Thermo-Physical Properties Of A Smart Composite
Djamila
Berrezzoug First-Principles Study Of The Half-Metallic Ii-N Compounds
Houda
Djebbar
First-Principles Study Of The Half-Metallic I-N Compounds
Asma
Bouabca
Half-Metallicy And Fully Compensated Ferrimagnetism In Cr Ba P Alloy
Ilhem
Zouari
Structural And Ferroelectric Properties Of Er Doped Bctyn Ceramics
Intissar
Ghamgui
Structural And Ferroelectric Properties Of Ero2 Doped Nbzt Ceramics
Ziyad
Yahiaoui
Synthesis And Optical Spectroscopy Of Eu3+ Ions In Ypo4 For Orange-Red Phosphors
Soltani
Sonia
Time-Resolved Photoluminescence Studies Of Alxga1-Xn/Gan Epitaxial Films Grown On Sin Surface-Treated Sapphire Substrate By AtmosphericPressure Movpe
[RAM 2016]
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Humboldt - Kolleg Research to Applications & Markets
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Field Electron Emission from MW Carbon Nanotubes and itsPotential as an Electron Source M.S. Mousa*,E.S. Bani Ali*, M.J. Hagmann**, Corresponding author:
[email protected][email protected] *Department of Physics, Mu’tah University, Al-Karak 61710, Jordan. * Surface Physics and Materials Tech Lab, Physics Dept, Mu'tahUniv, Al-Karak, Jordan. ** University of Utah, Dept. Elec. and Comp. Eng., Salt Lake City, Utah, USA, 84112.
Abstract: In thisstudyweusedNanocylTMNC 7000 ThinMultiwallCarbon Nanotubes (MWCNT) with a high aspect ratio (>150) made by the process of catalyticchemicalvapordeposition (CCVD). The MWCNT wereprepared by inserting in fine glass capillary tubes and pullingat high-temperatures to form a fine glass tip thatwascut. The distance from the MWCNT to the tin-oxidecoatedphosphorus glass anode was 10 mm. Fowler-Nordheim plots of the current-voltage characteristics show emissioncurrent switch-on for each of theseemitters. Measurementswerecarried out under ultra high vacuum (UHV) conditions witha base pressure of 10-9 mbar. The fieldelectronemission performance of this type of emitter shows promise as a reliable, stable, powerful and long-life electron source.
Keywords: Cold Field Emission, Carbon Nanotubes, Ultra High Vacuum, Fowler-Nordheim plot
[RAM 2016]
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Humboldt - Kolleg Research to Applications & Markets
Hammamet, Tunisia, September 16-18, 2016
Enhancing hyperpolarizabilities of organic molecules. A quantum mechanics study M. Sekkal-Rahal*, M. Zouaoui-Rabah* Laboratoire de Microscopie, Microanalyse et Spectroscopie Moléculaire (L2MSM), Faculty of Sciences. Djillali Liabes University of Sidi-Bel-Abbes, 22000 Sidi-Bel-Abbes. Algeria
[email protected] [email protected]
Abstract: A series of divinyl-pyrene derivatives consisting in D-vinyl-pyrene-vinyl-A, in which D corresponds to an electron donor group and A to an electron attractor group, systems were considered in this work. The first purpose was to determine the optimal HF % exchange as incorporated in a range of hybrid functional (M06HF, M062X,M06L,CAM-B3LYP, PBE0,BMK et B3LYP) capable to produce, reliably and as closest as possible to the those obtained from MP2 method, NLO parameters and particularly first order static hyperpolarizabilities. The CAM-B3LYP functional was revealed to be the most suitable one. The pair N(CH3)2/ NO2 was then determined as to be the most efficient couple groups in producing appreciable NLO responses. The effect of the substitution position on the pyrene moiety was also investigated, the direction aligning the two substituents involving the D and A groups to the dipole moment as in the (1,6 DVP) derivatives was shown to be the most favorable to perform the NLO parameters. Key words:Pyrene derivatives, NLO parameters, Intramolecular Charge Transfer (TCI), Hybrid Functionals, MP2 Method.
[RAM 2016]
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Humboldt - Kolleg Research to Applications & Markets
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Determination of thermo-physical properties of a gypsum composite PCM Moulahi chadia*, Trigui Abedlwaheb **, Boudaya chokri* Université de Sfax, Département de Physique, Route Sokra, C.P 3000 Sfax,Tunisie E-mail:
[email protected]
Abstract: Smart gypsum composite was manufactured by adding copper tubes containing Phase Change Materials in order to develop building materials with high thermal energy storage (TES) capacity useful for being applied in high comfort constructive systems. Firstly, an investigation by means of a differential scanning calorimeter (DSC) was carried out to obtain the latent heat and the transition temperature of paraffin. Secondly, an additional study was conducted to gauge the improvement of energy storage performance in classical construction material (Gypsum/copper tubes) filled with paraffin developed to improve different properties of PCM and open a wide field of applications to latent heat storage systems. Key words: Gypsum, Phase change material (PCM), Thermal Energy storage (TES), DSC analysis.
[RAM 2016]
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Humboldt - Kolleg Research to Applications & Markets
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First-principles study of the half-metallic II-N compounds B. Berrezzoug*, H. Djebbar, A. Lakdja, A. Chahed and H. Rozale Condensed Matter and Sustainable Development Laboratory, Physics Department,University of Sidi-BelAbbès, 22000 Sidi-Bel-Abbès, Algeria *
[email protected]
Abstract: The structural, electronic and magnetic properties of five alkaline-earth metal nitrides XN(X=Be, Mg, Ca, Sr and Ba) are investigated by means of the first-principales approach based on density functional theory (DFT). The calculations are performed using the pseudopotential method as implemented in Quantum-ESPRESSO code. The results on the structural properties confirm the stability of the II-N compounds in the B2 phase. In the other hand, the materials show a halfmetallic ferromagnetic state with a magnetic moment equal to 1µB. The only exeption is the BeN which is found to be non-magnetic. Key words:Alkaline-earth metal nitrides, Half-metal ferromagnets, Density functional theory.
[RAM 2016]
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Humboldt - Kolleg Research to Applications & Markets
Hammamet, Tunisia, September 16-18, 2016
First-principles study of the half-metallic I-N compounds H. Djebbar*, B. Berrezzoug, A. Lakdja, A. Chahed and H. Rozale Condensed Matter and Sustainable Development Laboratory, Physics Department,University of Sidi-BelAbbès, 22000 Sidi-Bel-Abbès, Algeria *
[email protected]
Abstract: We report a first-principles study of the hypothetical I-N compounds. The spin-polarized calculations indicate that these materials are half-metallic ferromagnets and exhibit an integer magneticmoment of 2µB. The most important property in these alkaline metal nitrides is that the half-metallicityis originated from the polarization of the p-N orbitals not present in the conventional transition metal orrare earth nitrides. Key words:Alkaline metal nitrides, Half-metal ferromagnets, Density functional theory.
[RAM 2016]
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Humboldt - Kolleg Research to Applications & Markets
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Half metallicity and fully compensated ferrimagnetisme in the Cr1-x BaxP alloy A.BOUABCA*, H.ROZALE*, A.AMMAR*, A.LAKDJA*, A.SAYEDE**,X.T. Wang ***
[email protected] [email protected] [email protected] [email protected]
Abstract: Thion the basic of ab_initio calculations we have systematically investigated the electronic andmagnetic properties of Cr1-x BaxP alloy,our calculations suggest that as we dope Bap with Cr atoms and move towards Cr1-x BaxP where x=0,0.25,0.5,0.75 and 0.875 all alloy are HMM ,interestingly Cr0.25Ba0.75P is a HMAFM otherwise fully componsated ferrimagnet,this alloy should be of special interset for applications since it creats no externel stray field and thus exibit minimal energy losses in addition, the robustness of half-metallicity with respect to the variation of lattice costants of Cr1-x BaxP is also discussed. Furthermore we found that this new HMFCF is stable according to its small formation energy Key words:DFT, HMM, HMFCF, alloy.
[RAM 2016]
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Structural and ferroelectric properties of Er doped BCTYN ceramics I. Zouari*, N. Abdelmoula*, Z. Sassi**, L. Seveyrat**, V. Perrin **, L.Lebrun ** and H. Khemakhem* *
Laboratory of Ferroelectric Materials, LR (R13ES22), Faculty of Sciences of Sfax, University of Sfax, BP 1171, 3000 Sfax, Tunisia
[email protected] [email protected] [email protected] **
Univ Lyon, INSA-LYON, LGEF, EA682, F-69621, VILLEURBANNE, FRANCE
[email protected] [email protected] [email protected] [email protected]
Abstract: Er doped BCTYN ceramics are prepared by the conventional solid state reaction method and their structural and dielectric properties were investigated. These polycrystalline samples are characterized using X-Ray diffraction (XRD), Dielectric measurements, Raman spectroscopy, hysteresis loop and piezoelectric measurements. X-ray diffraction analyses at room temperature showed that these samples crystallized in the tetragonal distorted perovskite structure. The dielectric measurements show classical ferroelectric behavior. The results of Raman spectra showed the vibrational modes at room temperature as well as transition electric existing and matched well with the dielectric results. Meanwhile, a good piezoelectric response was obtained for Er doped BCTYN ceramics and the observation of P–E hysteresis loops showed a slight increase of the remnant polarization (Pr) with the addition of Erbium.
Key words:Ceramics, XRD, Dielectric, Raman spectroscopy, piezoelectric, hysteresis loops.
[RAM 2016]
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Structural and ferroelectric properties of ErO2 doped NBZT ceramics I.Ghamgui*, A.Abdelhedi*, A.Maalej**, Z. Sassi**, L. Seveyrat**, V. Perrin **, L.Lebrun **andH.Khemakhem* *
Laboratoire des Matériaux Ferroélectriques (LMF), Unité de Physique Mathématiques, 05UR15-04, Université de Sfax, Faculté des Sciences de Sfax (FSS), Route de Soukra km 3.5, B.P. 1171, 3000, Sfax, Tunisie
**
[email protected] [email protected] [email protected] [email protected]
Univ Lyon, INSA-LYON, LGEF, EA682, F-69621, VILLEURBANNE, FRANCE
[email protected] [email protected] [email protected] [email protected]
Abstract: ErO2 doped Na1/2Bi1/2Ti0,975Zr0,025O3(NBZT) ceramics are prepared by the conventional solid state reaction method and their structural and dielectric properties were investigated. These polycrystalline samples are characterized using X-Ray diffraction (XRD), Dielectric measurements, Raman spectroscopy. X-ray diffraction analyses at room temperature showed that these samples crystallized in the tetragonal distorted perovskite structure. The dielectric measurements show relaxor ferroelectric behavior. The results of Raman spectra showed the vibrational modes at room temperature as well as transition electric existing and matched well with the dielectric results. Key words:Ceramics, XRD, Dielectric, Raman spectroscopy.
[RAM 2016]
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Synthesis and optical spectroscopy of Eu3+ ions in YPO4 for orange-red phosphors Z. Yahiaoui*, M.A. Hassairi* and M. Dammak* *
Université de Sfax, Laboratoire de Physique Appliquée, Groupe de Physique des matériaux luminescents, Faculté des Sciences de Sfax, département dePhysique, Université de Sfax, BP 1171, 3018 Sfax, Tunisie
[email protected] [email protected]
Abstract: YPO4:xmol%Eu3+ phosphors with different europium concentrations (x=3, 5, 8, 11, 13, 15) were synthesized via high temperature solid-state reaction. Detailed structural characterization was performed by X-ray diffraction (XRD), Raman and infrared (IR) spectroscopy. Under 375 nm wavelength excitation, the photoluminescence spectra display characteristic luminescence 5D0→7FJ (J = 1, 2, 3, and 4) intra-4f shell Eu3+ ion transitions. From these experimental data, the radiative lifetime and branching ratios were estimated using Judd–Ofelt intensity parameters Ω2 and Ω4. The optimal doping concentration for achieving maximum emission intensity was confirmed to be 11 mol%. The critical energy-transfer distance for the Eu3+ ions was evaluated and based on Dexter and Schulman theory the quenching mechanism was confirmed to be a dipole–dipole interaction. The temperature-dependent photoluminescence and CIE chromaticity coordinate of YPO4:Eu3+ phosphor were also investigated in this work. The results revealed that Eu3+ doped YPO4 exhibited good thermal stability and its emission intensity decreased slightly above room temperature. In particular, the color purity of this phosphor was as high as 94%, which made it a potential orangered material for application in the near-UV pumped white light emitting diodes. Key words:Concentration quenching, Judd-Ofelt theory, Luminescence, Phosphate
[RAM 2016]
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Time-resolved photoluminescence studies of AlxGa1xN/GaN epitaxial films grown by atmospheric-pressure MOVPE S. Soltani*, M. Bouzidi*, A. Toure *, M. Gerhard **, I. Halidou *, Z. Chine *, B. EL Jani *, M. K. Shakfa ** * Unité de recherche sur les Hétéro-Epitaxies et Applications (URHEA), 5000 Monastir, Tunisia ** Department of Physics and Material Sciences Center, Philipps-University of Marburg, Renthof 5, 35032 Marburg, Germany.
Abstract: In the present work, AlGaN/GaN epitaxial films have been grown on SiN surface-treated sapphire substrate by metal organic vapor phase epitaxy (MOVPE) under atmospheric-pressure. The Al content in the studied samples is varied between 3% and 15% though the change of the flow rate of trimethylaluminum (TMA) from 12 µmol/min to 32 µmol/min. The optical properties and carrier dynamics of the AlGaN/GaN epitaxial films are investigated by means of time-resolved Photoluminescence (TR-PL). Low temperature measurements show that the PL emission peak broadens and shifts to higher energies when the TMA flow rate is increased. Simultaneously, the PL decay time increases with increasing Al contents in the studied films. These observations can be attributed to the carrier localization effects in band tail states due to compositional fluctuations in the AlGaN layers. Remarkably, the PL spectrum of the epitaxial film with a relatively high Al content of 15 % reveals several peaks. In order to find out about the origin of these features, temperature-dependent PL measurements are performed in the range from 25 K to 300 K.
Keywords: AlGaN, Metal organic vapor phase epitaxy, Photoluminescence, time-resolved photoluminescence.
[RAM 2016]
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Nanosciences (NS2) Charalampos
Baniotopoulos Wind Energy Technology Reconsideration to Enhance the Sustainability Features of Smart Cities
Hatem
Bentaher
Energetic Efficienty of a PVTSolar Drier
Lakhal
Amira
Modeling Of The Time Of Pricking In A Company Of Clothing
Tarak
Kallel
Studies of optical centers occupied by Erbium ions in AlN NPs
Aida
Benchaabane Effect Of Cdse Nanoparticles Incorporation On The Performance Of P3Ot Organic Photovoltaic Cells
Nefzi
Chaima
Effect Of Gamma Radiations On Structural And Optical Properties Of Iron Doped Indium Oxide Thin Films
Slah
Hlali
Electrical Characteristics Of Metal-Isolant-Semiconductor (Mis) NanoDevice
Mohsen
Mhadhbi
Fabrication Of Nanocrystalline Ticrc Powders By Mechanical Alloying
Tarek
Hidouri
Impact Of Temperature Coupled With The V/Iii Ratio Variation And Lse Modelization Of The Exciton Transfer Between Localized States Of Bxga1-Xas/Gaas Epilayers
Hazem
Bouhamed
Improved Solid Oxide Fuel Cell Performance With Nanostructured Electrolytes.
Chatbouri
Samir
Interface Traps Effect On The Charge Storage Characteristics In Metal Oxide Semiconductor Structures Based On Silicon Nanocrystals
[RAM 2016]
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Wind Energy Technology Reconsideration to Enhance the Sustainability Features of Smart Cities C.C.Baniotopoulos *
School of Engineeering, University of Birmingham, Birmingham, B15 2TT U.K.
[email protected]
Abstract: Sustainable development is tightly related to the fate of sustainable energy. According to the Horizon 2020 decisions, EU countries ensured their commitment to reduce greenhouse gas emissions by 20% by 2020 with the objective of a further reduction up to 80-95% by 2050.Along this line, future cities aim at 15% of renewable energy in terms of produced energy by renewable sources. In other words, sustainable energy is energy obtained from non- exhaustible resources and in this sense, sustainable energy by definition serves the needs of the present without compromising the ability of future generations to meet their needs. Technologies that promote sustainable energy include renewable energy sources, such as wind energy, and also technologies designed to improve energy efficiency. Nowadays, the major contributors of locally produced renewable energy are photovoltaic systems, solar panels and combined heat power systems, and the significant potential from wind energy to complement them. During the last years the cost of sustainable energy has significantly fallen and continues to fall. Most of the aforementioned technologies are nowadays either economically competitive or close to being so. Increasingly, effective government policies support investor confidence leading to the expansion of these markets. Thus, considerable progress has been observed in the energy transition from fossil fuels to sustainable energies. It seems that it is now the appropriate time for all countries stakeholders to intensively collaborate in order to exchange expertise, to discuss open problems and disseminate the respective outcomes to stakeholders, engineers, designers, researchers, municipalities and governments. This presentationisfocused on two distinct research efforts thateffectivelycontribute to thisprocedure of the enhancement of sustainableenergy and in particular, the windenergy : the first one refers to repoweringthatis the replacement of the existingoldwind turbines withfewer and taller onesbeing able to yield more energy, whereas the other important effort to betterestablishwindenergyharvestingconcerns the builtenvironmentwindenergytechnology.
Key words:wind energy, sustainability, future smart cities.
[RAM 2016]
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Energetic Efficiency of a PVT Solar Drier H. Bentaher1,2,M. Fterich1, H. Chouikhi1,2and A. Elloumi1,2 1
LASEM laboratory, ENIS, Sfax 3038- Tunisia 2 ISSIG Gabès-Tunisia
[email protected]
Abstract: Solar Energy can be used to produce heat and/or electricity. PVT panels are a good application to produce both photovoltaic and Thermal energies. This induces an improvement of energetic efficiency of the panel since it is the summation of electric and thermal outputs. One of the applications of this hybrid panel is drying. In African countries, Agro-food products are subject of spoiling due to the fluctuations in production and the cost of product refrigeration. One of the used solutions is solar drying. However actually the main used method is open sun drying which causes the exposition of Agro-food products to dust and insects. To improve this process in order to reach International hygienic standards, the bilateral European Project Tunisia/Italy : ESSORENTREPRISE was funded by the CE. Its objective was to promote micro-enterprises in Agro-food sector by the introduction of small mechanized machines. In this scope, a PVT drier was constructed. Composed by two chambers to compare different working modes this drier used photovoltaic energy to power two fans for forced convection. Air can enter directly to drying chamber or after being pre-heated in the PVT panel. After the evaluation of the PVT efficiency, application of the mixed drying on tomatoes was compared to open sun drying. Temperature in the drier chamber reached 57°C however the ambient one did not exceed 37°C. This improved the drying process for the mixed dryer by shortening the drying time and reducing the remaining percentage of water in the dried tomatoes. Keywords: Solar mixed dryer, PV/T air collector, drying tomatoes
[RAM 2016]
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Modeling of the time of pricking in a company of clothing LAKHAL Amira*1, SEJRI Nejib2, CHAABOUNI Yassine3, JAAFAR Fadhel4 and CHEIKHROUHOU Morched5 *1
Corresponding author:
[email protected] 2 Co-author:
[email protected] 3 Co-author:
[email protected] 4 Co-author:
[email protected] 5 Co-author:
[email protected]
Abstract: The time in the clothing, industry is the most important element for the organization of work and for the company's gain. This study had for objective to modelization the time of pricking in a company of clothing. The method of the plans of experience used to find the best approach for the study. The software “TOP CHRONO VR3” used to performing tests. Then the analysis of results was doing by Minitab. The method of timing and the method of General Sewing Data are using to compare our model on the practical plan. The found model is statistically significant and representative. The practice validation of the model is made in two companies of clothing. The model is validated in practice. A model to calculate the time of pricking is founded. Indeed, this model is statistically significant, representative, and validated according to the law of Fisher-predictor. According to the practical study, the model is validated for articles intended for technical uses and articles for the clothing. The gaps between the used methods varies between “-0.22 %” and “4.3 %”, thus our model is practically validated for the studied articles. Key words:Time, prinking, method, GSD.
[RAM 2016]
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Studies of optical centers occupied by Erbium ions in AlN NPs T. Kallel*, T.Koubaa*, M. Dammak*, S.G. Pandya**, M. E .Kordesch**, J. Wang***, W. M. Jadwisienczak*** and Y. Wang**** *
Laboratoire de Physique Appliquée, Groupe des Matériaux Luminescents, Université de Sfax, Faculté des Sciences de Sfax, Département de Physique, Route de Soukra, Km 3.5, B.P. 1171 3000 Sfax, Tunisia *
[email protected] *
[email protected] *
[email protected] ** Department of Physics and Astronomy, Ohio University, USA ***School of Electrical Engineering and Computer Science, Ohio University, Athens, OH 45701, USA ****Center for Electrochemical Engineering Research, Ohio University, Athens, OH 45701, USA
Abstract: Optical properties of Er-doped AlN nanoparticles (NPs) synthesized by Inert Gas Condensation (IGC) on silicon (111) substrates were investigated. Transmission electron microscopy (TEM) and high resolution TEM (HR-TEM) were used to study the shapes, morphologies and size of the synthesized AlN: Er3+ NPs which have a spherical shape with a mean diameter between 12 nm and 15 nm. The optical properties of AlN: Er3+ NPs were assessed from low temperature cathodoluminescence spectra (CL). The CL spectra show visible and near infrared sharp and broad emission lines associated with Er3+ ions. The observed Er3+ ion transition lines broadening is due to the surface defect in studied NPs. Comparative investigations of the luminescent properties of AlN: Er3+NPs with those of AlN: Er3+ thin films show the presence of some similarities between the lattice sites occupied by Er3+ ions in these hosts. It was found that in AlN NPs the Er3+ ion occupy a second optical center, which is the VN-Er complex beside the ordinary substitutional ErAl center observed in the case of AlN: Er3+ epilayers. Assuming the presence of these two sites occupied by Er3+ ions, the majority of CL emission lines were attributed. The experimental Stark energy levels of Er3+ ion manifolds are established for the Er-doped AlN NPs and the correspondent crystal field parameters are calculated. Key words:AlN nanoparticles, Crystal-field calculation, Optical spectroscopy, Stark splitting;
[RAM 2016]
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Effect of CdSe nanoparticles incorporation on the performance of P3OT organic photovoltaic cells A. Benchaabane1,2, Z.Benhamed 2, M .Lejeune2, M.A. Sanhoury 3, F. Kouki1, A. Zeinert2 and H. Bouchriha1 1
Laboratoire Matériaux avancés et phénomènes quantiques, Faculté des Sciences de Tunis El Manar, Campus Universitaire, Université Tunis El-Manar, 2092 Tunis, Tunisia 2 Laboratoire de Physique de la Matière Condensée, UFR des Sciences d’Amiens, 80039 Amiens, France 3 Laboratoire de Chimie organique Structurale, Synthèse et études Physicochimiques, Campus Universitaire, 2092 Tunis, Université Tunis El-Manar, Tunisia E-mail:
[email protected]
Abstract: Photophysics of hybrid nanostructures of π-conjugated polymers and inorganic nanoparticles remains a frontier area of research due to the potentials of such structures in the development of optoelectronic, solar and light harvesting devices [1,2]. In this work, optoelectronic properties of P3OT:wt%CdSe composite films are investigated as a function of CdSe nanoparticles (NPs) concentration (wt%) incorporated in the films. The incorporation of CdSe NPs produces a quenching of the photoluminescence and improves the performance of solar cells based on the composites. These effects are explained in terms of exciton dissociation and charge separation occurring at P3OT/CdSe interfaces within the Förster formalism [3]. An exciton quenching rate constant of 1.4.10-10 cm3.s-1 was determined using the Stern-Volmer equation. In addition, scanning electron microscopy (SEM) images revealed that the whole surface morphology was changed following CdSe NPs incorporation, in agreement with FTIR spectra. The J-V characteristics of ITO/P3OT:%CdSe/Al photovoltaic cells are also reported and indicate a significant improvement of the photovoltaic parameters cells, in particularly the conversion efficiency become 20 times greater than the cell based on pure polymer. Key words: polymer, nanoparticles, photovoltaic cells. References [1]Z.BenHamed, N.Mastour, A.Benchaabane, F.Kouki, M.A.Sanhoury, H.Bouchriha, Journal of Luminescence, 170.,30–36 (2016) [2]S. Bhattacharyya, A. Patra, J. Photochem. Photobiol. C: Photochem. Rev, 20., 51-71 (2014) [3]Jayesh Patel, FrejMighri, AbdellahAjji, TapasK.Chaudhuri, Nano Energy, 5, 36–51 (2014)
[RAM 2016]
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Effect of gamma radiations on structural and optical properties of iron doped indium oxidethin films Chaima Nefzi 1*, Mehdi Souli 2**and Najoua Kamoun3*
[email protected] [email protected] [email protected]
Abstract: Iron-doped indium oxide thin films were prepared by spray pyrolysis technique on glass substrates and irradiated by 1 kGy of gamma dose. Structural and optical properties were investigated respectively by X-Ray diffraction and spectrophotometer. Experimental results show that structural properties of irradiated thin layers revealed that Fe doped In2O3 thin films exhibit the same cubic structure of predominant orientation (400) appears at 2θ=35,5° with a increase in crystallite size. Transmission values of irradiated thin layers were found to increase from 78% to 84%. The direct energy gap decreases from 3,06 eV to 2,94 eV. Systematic studies of optical constants such as refractive index n(λ) , extinction coefficient k(λ),real (εi) and imaginary (εj) part of the dielectric constant were calculated . Key words:Iron doped indium oxide thin films, Spray pyrolysis, Gamma radiation
[RAM 2016]
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Electrical characteristics of MIS nano-device Slah Hlali*, Neila Hizem** and Adel Kalboussi*** *
[email protected]
Abstract: Quantum correction in the inversion layer charge density calculation was investigated. This study is carried out for one-dimensional Metal-Insulator-Semiconductor (MIS) structure with (100) oriented P-type silicon as substrate. The purpose of this paper is to point out the differences between the semi-classical and quantum-mechanical charge description at the interface Al2O3/Si. And identify some electronic properties of our MIS device using different thickness of the high-K oxide and diverse temperature with different carrier statics (Fermi-Dirac statics and Boltzmann statics). In particular, capacitance voltage (C-V), Sheet electron density, relative position of the subband energies and their wave functions are performed to examine qualitatively and quantitatively the electron states and charging mechanisms in our device.
Keywords: Nanoscale device, MIS device, Quantum-Mechanical model, Semi-classical model, High-k/semiconductor interface, quantum confinement phenomenon.
[RAM 2016]
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Fabrication of nanocrystalline TiCrC powders by mechanical alloying Mohsen Mhadhbi* and Mohieddine Abdellaoui** 1
Laboratory of Useful Materials National Institute of Research and Physical-chemical Analysis Technopol of Sidi Thabet, 2020 Sidi Thabet, Ariana, Tunisia *
[email protected]
**
[email protected]
Abstract: Mechanical alloying, as a low-temperature solid-state powder processing technique, was applied to prepare homogeneous nanocrystalline TiCrC alloy, starting from the Ti, Cr and graphite elemental powders. The evolutions of constitution phases, microstructural features, and chemical compositions of the milled powders at various milling times were studied by the XRD, EDX and laser particle size analyzer.The results obtained showed that the TiCrC diffractioncrystallite size decreases tremendously and its microstrain increases as the milling duration increases. After 20 h of milling, the minimum crystallite size was found to be around 10 nm.
Key words:Nanostructures; Mechanical alloying; X-ray diffraction; TiCrC.
[RAM 2016]
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Impact of temperature coupled with the V/III ratio variation and LSE modelization of the exciton transfer between localized states of BxGa1-xAs/GaAsepilayers Tarek Hidouri*, Faouzi Saidi** and Hassen Maaref*
[email protected] [email protected] [email protected]
Abstract: In this work, BxGa1-xAs/GaAsepilayers with three different boron compositions were elaborated by metal organic chemical vapor deposition (MOCVD) on GaAs (001) substrate. High resolution X-ray diffraction (HRXRD) spectroscopy has been used to estimate the boron fraction. The luminescence keys were carried out as functions of temperature in the range 10–300 K, by the techniques of photoluminescence (PL). The low PL temperature has shown an abnormal emission appeared at low energy side witch attributed to the recombination through the deep levels. In all samples, the PL peak energy as well as the full width at half maximum (FWHM), present an anomalous behaviors as a result of competition process between localized and delocalized carriers. We propose the LSE model to explain the unusual photoluminescence behaviors. Electrical carriers generation, thermal escape, recapture, radiative and non-radiative life time are taken into account. The temperature-dependent PL keys were found to be in reasonable agreement with the model of localized states. We controlled the evolution of such parameters versus composition by varying the V/III to have a quantitative and qualitative understanding. At high temperatures, the model can be approximated to the band-tail-state emission.
Key words:Photoluminescence, HRXRD, BGaAs/GaAs, LSE, S-shaped.
[RAM 2016]
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Improved Solid Oxide Fuel Cell Performance with Nanostructured Electrolytes Hazem BOUHAMED Laboratoire de Chimie Industrielle (LCI), Ecole Nationale d’Ingénieurs de Sfax (ENIS), BP 1173 - 3038 Sfax, Tunisia
[email protected] Tel. : +216 74241403 ; Fax : +216 74246347
Abstract: Reducing of the operating temperature of Solid Oxide Fuel Cells (SOFCs) from 800°C 1000°C to 400°C - 600°C is of great importance, because it means both a prolonged stack life time and a cost reduction. 8YSZ co-doped with 4 mol% MxOy (YSZ-MxOy) powders have been elaborated by solid state reaction at 1500°C during 12 h. YSZ-CeO2, YSZ-ZnO and YSZ-CeO2ZnO have been fully stabilized cubic zirconia (c-ZrO2). Compared to the reference sample (8YSZ), all the doped electrolytes YSZ-MxOy have shown a modified dilatometric behavior with much lower linear thermal expansion coefficient in the temperature range 200°C - 1200°C. Electrical measurements between 400°C and 600°C have shown an important improvement of the ionic conductivity of YSZ-CeO2, YSZ-CeO2-ZnO and YSZ-ZnO, compared to 8YSZ. Finally, the performance tests of 200 μm thick film YSZ-MxOy as an electrolyte of SOFCs, have revealed spectacular results in terms of open circuit voltage (OCV about 1.03 V) and maximum power density (440 mW.cm-2), suggesting that (ZrO2)0.88(Y2O3)0.08(CeO2)0.03(ZnO)0.01 could be a good candidate as electrolyte for Low-Solid Oxide Fuel Cells (L-SOFCs). Key words:ceramics;Nanoparticles;SOFCs; Yttria-stabilized-zirconia; Electrical conductivity.
[RAM 2016]
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Interface Traps Effect on the Charge storage characteristics in metal oxide semiconductor structures based on silicon nanocrystals Samir.Chatbouri(1), Manel.Troudi(1),Adel. Kalboussi(1), Abdelkader.Souifi(2). 1
2
Laboratoire de Micro´électronique et Instrumentation (LR13ES12), Faculté des Sciences de Monastir, Avenue de l’environnement, Université de Monastir, 5019 Monastir, Tunisia
[email protected] [email protected] Institut des Nanotechnologies de Lyon - site INSA de Lyon, UMR CNRS 5270, Bât. Blaise Pascal, 7 avenue Jean Capelle, 69621 Villeurbanne cedex, France
[email protected]
Abstract: In this work we present the contribution of deep-level traps in the charge storage for the Metal-Oxide-Semiconductor (MOS) structures having a silicon nanocrystals (Si-NCs) in the SiOx=1.5 oxide matrix.Using the deep-level transient spectroscopy (DLTS) we observe a slow electron trap in the reference samples without Si-NCs.A clear series of electron traps are evidenced in DLTS spectra for MOS samples with Si-NCs. The dominance of the thermionic transition dot to dot from the conduction band of Poly-silicon layer to conduction band of silicon substrate via the Si-NCs in the oxide tunnel layer will be made for charge storage. Moreover, the DLTS response of individual Si-NC is treated as a single point deeper level defect in the oxide for a potential barrier at about 14 meV. The trapping mechanism in the Si-NCs quantum levels through a fine potential barrier will be made by a tunnel emission from dot to dot for low temperatures. These results are helpful to understand the principle of charge storage of MOS structures having a few Si-NCs number in the SiOx=1.5 oxide matrix. Key words:Silicon nanocrystals, Metal-Oxide-Semiconductor, oxide tunnel traps , DLTS measurements.
[RAM 2016]
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Nanosciences (NS3) PL11 Azzedine Malek
Bendounan
Silicene, a promising new 2D materiel for science and nanotechnology
Fouzai
Mesogenic Propreties Of Two Supramolecular Liquid Crystals Induced By Intermolecular Hydrogen Bonding
Abdelghaffar Nasri
Modeling of Molecular Field Effect Transistor
Amine
Touati
Si-Single Electron Transistor Model
Baligh
Touati
Structural And Optical Characterization Of Pbs Thin Films Doped With Cd
Salah
Khalil
Structural, Electrical And Optical Properties Of Mgpc Doped H2O2 Thin Films Deposited By Spin Coating Method
Héla
Chamroukhi Synthesis And Characterization Of Hybrid Thin Films Based On Polyaniline (Pani)-Nanoparticles
Imen
Ammar
Synthesis And Characterization Of Tin Sulphide Chalcogenide Nanoparticles: Influence Of Reactants On The Chemical Composition
Rafika
Hamdi
Theoretical Investigation Of The Strontium Metal Solvated In A Xenon Complex
Karim
Affes
Thermal properties of a spin crossover nanoparticle investigated with an electro elastic model
Rim
Ben Brahim X-Ray Diffraction Patterns Of Nanoporous Silicon: Simulation Study
Rihab
Ben Ayed
Influence of iron concentration on the physical properties of sprayed Fe2O3 thin films
Aliani
Chedia
Effect Of The Rear Contact And Intrinsic Thin Layer On The Parameters Of N(A-Si:H)/I(A-Si:H)/P(C-Si) Heterojunction Solar Cells
[RAM 2016]
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Silicene a promising new 2D materiel for science and nanotechnology H. Oughaddoua, H. Enriqueza, M. R. Tchalalaa,b, H. Yildirimc, A. J. Maynea, A. Bendounand,&, G. Dujardina, M. Ait-Alib and A. Karac a
Institut des Sciences Moléculaires d’Orsay, ISMO-CNRS, Bât. 210, Université Paris-Sud, F-91405 Orsay, France b Laboratoire de Chimie de Coordination et Catalyse, Département de Chimie, Faculté des SciencesSemlalia, Université Cadi Ayyad, Marrakech 40001, Morocco* c Department of Physics, University of Central Florida, Orlando, FL 32816, USA d Synchrotron SOLEIL, L’Orme des Merisiers Saint-Aubin, B.P. 48, 91192 Gif-sur-Yvette Cedex, France &
[email protected]
Abstract: Both fundamental and applied research as well as industrial development of nanoelectronics is focused essentially on alternatives to the metal–oxide–semiconductor (CMOS). At present, graphene is the best and the most sought-after candidate because of its exceptional properties. However, the metallic character and the absence of an energy band gap in graphene sheets complicate the fabrication of a large variety of devices. Faced with this difficulty, recent attention has been given to new 2D material candidates amenable to tuning their properties. From this point of view, silicene is considered to be promising novel materials for this purpose. Theoretical investigations so far have shown that both silicene and graphene can have similar properties; such as a large charge carrier mobility and Hall effect. Few studies have been performed, for example on the Ge/Ag and Si/Ag systems. However, so far only the Si/Ag system forms the 2D silicene honeycomb structures similar to graphene. We have succeeded in synthesizing silicene on both the Ag(110) and Ag(111) substrates. On the Ag(110) surface, parallel silicene nanoribbons (NRs) 1.6 nm wide were obtained. The silicene NRs were shown to be less reactive than silicon towards oxidation. Moreover angle-resolved photoelectron spectroscopy (ARPES) measurements showed quantum confined electronic states of a one-dimensional character with a dispersion along the direction of the NRs at the high symmetry point of the Brillouin zone, suggesting a behavior analogous to the Dirac cones of graphene.
[RAM 2016]
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Mesogenic propreties of two supramolecular liquid crystals induced by intermolecular hydrogen bonding M. Fouzai*, T. Soltani and T. Othman. Université de Tunis El Manar, Physique de la Matière Molle et de la Modélisation Electromagnétique, Faculté des Sciences de Tunis, Tunisie *corresponding author:
[email protected]
Abstract: Liquid crystal material has a major effect on many areas of sciences and engineering. Applications for this material are still being discovered and continue to provide effective solutions to many different problems. Most of the liquid crystals used in display technology are the eutectic mixtures that are developed by mixing two or more mesogenic materials. Hydrogen-bonded liquid crystals and their complex mixtures are an excellent example of the eutectic mixtures, they have interesting physical properties in accordance with the intermolecular hydrogen bonds. In the present work, two hydrogen-bonded liquid crystals and their mixtures are characterized for their mesophase behavior by differential scanning calorimetry (DSC), polarized-optical microscopy (POM), frequency domain dielectric spectroscopy and electro-optic methods. The (Temperature – Concentration) phase diagram is established. The effect of the fluoro substituent on the mesomorphic behavior is discussed as well.
Key words:Hydrogen-bonded liquid crystal, binary mixture,fluoro substitution.
[RAM 2016]
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Modeling of Molecular Field Effect Transistor A.Nasri1*, A.Boubaker1, B.Hafsi1.2,W.Khaldi1and A.Kalboussi1 1
University of Monastir, Faculty of Science of Monastir, Microelectronics and Instrumentation Laboratory, Avenue of the Environment -5019, Monastir, Tunisia 2 Institute of Electronic, Microelectronic and Nanotechnology, IEMN Laboratory, Avenue Poincaré-59652 Villeneuve d’Ascq Cedex, France *
[email protected]
Abstract: In this paper, a theoretical study of Single Molecule Transistor (SMT) operating as a molecular field effect transistor (MFET). We have applied the density functional theory (DFT) in conjugation with non equilibrium green’s function (NEGF) formalism on a pentacene device to obtain the I–V characteristics.A good agreement with numerical results was obtained. The electrical parameters influence on the I-V curves of the MFET was studied using MATLAB simulator. The negative differential resistance (NDR) effect, the dependance of the bias voltage and temperature has been outlined.
Key words:Quantum molecular devices, negative differential resistance, Organic semiconductors, molecular field effect transistor, Simulation.
[RAM 2016]
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Silicon Single-Electron Transistor model Amine Touati* and Adel Kalboussi* *
Laboratoire de Microélectronique et Instrumentation (UR/03/13-04) ,FSM, Avenue de l’environnement, 5019 Monastir, Tunisia
[email protected] [email protected]
Abstract: Semiconductor single-electron transistor (SET) has attracted much attention for small size, ultra low power and room temperature. A physically based analytical Silicon single-electron transistor model is proposed. This model uses the orthodox theory, which makes it particularlysuitable for hybrid simulation where the SET is biased by a current source. The model is validate experimentally with excellent agreement and compared to existing models. It isfound that our model is valid and accurate whatever the drain-gate voltage and faster than reportedmodels on the whole. A way to integrate into the model the effects of spin-degenerate quantumenergy level discreteness, in the case of a silicon-based SET, is also introduced and observedquantum mechanical effects, such as negative differential conductance (NDG). Key words:Single-electron transistor, Silicon, Spin, Orthodox theory, Negative Differential Conductance
[RAM 2016]
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Structural and optical characterization of PbS thin films doped with Cd Baligh Touati1, Abdelaziz Gassoumi 1, Alberto Vomiero2 and Najoua Kamoun Turki1. 1
Laboratoire de Physique de la Matière Condensée, Faculté des Sciences, Université de Tunis El Manar, Tunisie (2092), Tunisia. 2 Luleå University of Technology, Luleå, Sweden. * Corresponding author. Tel: +21625503320; fax: +21671885073 E-mail address:
[email protected]
Abstract: Lead sulphide (PbS) thin films represent a direct band gap IV–VI p-type semiconductor material (Eg= 0.41 eV) and have a good potential application in solar cells, infrared detector devices, sensors, etc. The structural and optical properties of PbS film can be tuned via doping with Cd2+. These ions have good ability to substitute Pb2+ locations in the PbS crystal lattice, and thus tune its energy band gap. Also, the structural properties of the film, such as the grain size, can depend on the dopant concentration and will affect the PbS band gap and conductivity. These features are important for instance, when PbS film are applied as photoactive materials in solar cells. Here we present an investigation on doping PbS thin films by Cd. Cd-doped PbS films were deposited through chemical bath deposition on ordinary glass substrates. XRD patterns of both Cddoped films are consistent with PbS. The morphology and topography of the doped PbS films were examined using tapping mode AFM (NT-MDT Ntegra) and high-resolution SEM (Magellan 400 XHR-SEM). The crystalline shape was triangular for undopedPbS films and quadratic for Cd-doped PbS films and did not change much with the dopant concentration increase from 0.5% to 2%. Films in the range 240 to 380 nm were considered. The optical parameters of PbS films showed very dependent of the change of Cd doping level. Therefore, Optical band gap is blue-shifted from 0.72 eV to 1.4 eV with increase in Cd doping concentration. The possibility of tuning both the electrical and optical properties of PbS thin films by doping represents a viable strategy for the development of suitable optically active materials for application in photovoltaics. Key words:PbS thin films; Chemical Bath Deposition ; morphological andproperties.
[RAM 2016]
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Structural, electrical and optical properties of MgPc doped H2O2thin films deposited by spin coating method Salah Khalil 1, Mehdi Souli 1, Cathy Guasch 2 and NajouaKamoun 1 1
Physics Laboratory of Condensed Matter, Faculty of Sciences of Tunis El Manar, Tunisia (2092), Tunisia Institute of South Electronics, Team RADIAC, University of Montpellier 2, CNRS-UM2, Building 5, 860 Rue St - Priest, 34090 Montpellier, France. Corresponding author: Tel.+216 21 237 411, E-Mail adress:
[email protected]
2
Abstract: Magnesium phthalocyanine (MgPc) doped 5%H2O2
in solution, has been deposited on
glass substrates by spin coating method. The interest of doping by H2O2 is to oxidize MgPc then to improve their electrical properties. MgPc/H2O2 thin films are characterized by X-ray diffraction (XRD), atomic force microscopy (AFM), scanning electronic microscope (SEM), Hall effect measurement and spectrophotometer. XRD analysis indicates a monoclinic structure of MgPcand MgPc/H2O2 in β phase, AFM measurements revealed that surface of our materials is locally homogeneous, dense and smooth. SEM shows spherical nanoparticles of MgPc and MgPc/H2O2 thin films. Electrical properties of MgPc/H2O2 have determined used Hall effect measurement. All optical properties are investigated by transmission and reflection measurements. Moss, HerveVandamme and Spizer-Fan models were used and validated for organic MgPc/H2O2 thin films. After doping, the obtained results indicate an improvement in crystalline structure, electrical and optical properties of MgPc thin films. Key words:Metal phthalocyanine thin films; spin coating; structural, optical and electrical properties.
[RAM 2016]
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Synthesis and characterizations of hybrid thin films based on Polyaniline (PANI)-Nanoparticles Chamroukhi Héla 1, M.Bassou 1, M.T.Ben Dhia2, M.N.Belgacem3 , H.Bouchriha1 1: Laboratoire des matériaux avancés et phénomènes quantiques (LMAPQ) , FST 2: Laboratoire de Chimie Organique Structurale : Synthèse et Etudes Physico-Chimiques (LCOS/SEPC) , Equipe de chimie de coordination ,FST 3:Laboratoire Génie des Procédés Papetiers (LGP2) UMR CNRS 5518, GRENOBLE INP PAGORA, France E-mail:
[email protected]
Abstract: Conductive polymers have generated a great interest because of their physical and chemical proprieties. The polyaniline (PANI) is a conductive conjugated-π polymer. When the conduction mechanism is through hole, it can be used in various applications due to itschemical stability, electrical and ease of synthesis and doping. The aim of this work is to prepare films by mixing organic polymer (Pani) solutions with several metallic and/or oxide nanoparticles by spin coating technique. We have varied the nanoparticles/PANI ratio varied from 15 to 60 w/w%. The prepared films were characterised by ( Fourier Transform infrared spectroscopy (FTIR), nanosizer particles, thermogravemetric analyses (TGA), Atomic Force Microscopy (AFM) and Scanning Electron Miscroscopy (SEM).The SEM micrographs showed that the prepared films were heteregeneous, whereas AFM was able to setect the added nanoparticles.
Key words:semi-conductor polymer,nanoparticles ,PANI, FTIR,AFM
[RAM 2016]
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Synthesis and characterization of tin sulphide chalcogenide nanoparticles: Influence of reactants on the chemical composition Ammar Imen, Anis akkari **Najoua Turki-Kamoun * *
Address of Author 1 & Author 3
[email protected],
[email protected] **
Address of author 2
[email protected]
Abstract: SnS thin films were deposited on glass substrates by chemical bath deposition from aqueous
solution containing triethanolamine (TEA) (C6H15NO3), trisodium citrate (C6H5Na3O7) (0.66M), ammonia (NH4OH) solution, ammonium chloride (NH4Cl), Sn2+(0.1 M) and thioacetamide (CH3CSNH2) with the aim of optimising the physical properties of this binary. These films were characterised with X-ray diffraction (XRD) and spectrophotometric measurements. The XRD analyses show that SnS films crystallize into orthorhombic structure. Optical analyses by means of transmission T(λ) and reflexion R(λ) measurements show a direct forbidden
and indirect allowed transitions which are nearly equal to the theoretical optimum value of 1,50 eV
for efficient light absorption. On the other hand, orthorhombic tin sulfide exhibit a high absorption coefficient up to 2 × 105 cm−1 . Optical constants such as the Urbach energy, optical conductivity, and the carrier concentration were determined from optical measurements.
The interesting remark note is that the physical properties of tin sulphide are affected by reactants concentration on the chemical deposition. Using the optimised conditions it is possible to produce thin films of tin sulphide that are suitable for use in thin film solar cell structures such as: Mo/SnS/ZnO/ZnO: Al/Al and Mo/SnS/In2 O3 /
In2 O3 : Mo/Al, where ZnO and In2 O3 are well grown in our laboratory by spray pyrolysis. Key words:CBD,chemical bath deposition, reactants concentration
[RAM 2016]
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Theoretical investigation of the strontium metal solvated in a xenon complex R.Hamdi1, a, S.Mtiri1, B.Oujia1, 2 1
Laboratoire de Physique Quantique, Département de Physique, Faculté des sciences de Monastir, Avenue de l’Environnement, 5019 Monastir, Tunisia. e-mail :
[email protected] [email protected] 2 Department of Physics, Faculty of Science, King Abdulaziz University, North Jeddah Branch, P.O. Box 80203, Jeddah 21589, Kingdom of Saudi Arabia. e-mail :
[email protected]
Abstract: Studies focused on alkaline-earth-rare gas clusters are of a great importance. Because of the nonbonding character of rare gas atoms, these systems can serve as prototypes for a number of studies interested in structural and optical properties of solvated atoms or molecules. Several fundamental problems in the fields of inorganic chemistry and biochemistry can be understood by studying clusters such as nucleation and solvation phenomena. In this context we have realized a theoretical study of the Sr+Xen clusters. We have determined the stable structures and the stability of these clusters. For this we have used the so-called “basin hopping” method to find the minimum energy. The stability of such clusters has been discussed using the primary and the second energy differences histograms. The most important conclusion is the high stability of Sr+Xe12which is related to the icosahedral structures on which all the structures of clusters have been constructed.
Key words:Clusters, Stability, magic numbers, icosahedral.
[RAM 2016]
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Thermal properties of a spin crossover nanoparticle investigated with an electro elastic model K. Affes1, A. Slimani1, K. Boukheddaden2, A. Maalej1and H. Khemakhem1 1Laboratoire
des Matériaux Ferroélectriques, Faculté de Science de Sfax, Route de la Soukra km 3.5, 3000, Sfax, Tunisie
[email protected] [email protected] [email protected]
2 GEMaC,
Université de Versailles Saint Quentin en Yvelines, Versailles, 78000, France
[email protected]
Abstract: The functionalization of spin crossover materials at low scales presents a big challenge to be surmounted. We considered a spin crossover nanoparticle embedded in a matrix and we studied the effect of the size of the nanoparticle, the elastic interaction between the molecules, the stiffness of the nanoparticle, and finally the position of the nanoparticle inside the matrix on the thermal properties of the spin crossover nanoparticle. The analysis was performed using an electro-elastic model based on the Monte Carlo method running on a distortable 2D square lattice whose sites are occupied by low spin (LS) and high spin molecules (HS). Such analysis reflects the crucial influence of the size, position, shape as well as of the surrounding environment on the behavior of the spin transition, and it supply reliable explanations founded on the elastic properties of the system.
Key words: Spin crossover, thermal transition, nanoparticle, Monte Carlo
[RAM 2016]
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X-ray diffraction patterns of nanoporous silicon: simulation study R. Ben Brahim*and A. Chehaidar* *
Laboratoire de Physique-Mathématique et Applications, Université de Sfax, Faculté des Sciences de Sfax, Département de Physique, B.P. 1171, 3000 Sfax, Tunisia
[email protected] [email protected]
Abstract: Nanoporous silicon stimulates the interest of the scientific community and technologists also due to itsunique optical, electrical and optoelectronic properties. Several experimental studies have revealed astrong dependence of its physical properties with its unique microstructure. As with all materials, theX-ray diffraction technique is preliminary to a direct exploration of the microstructure of nanoporoussilicon. Thus, several studies of characterization by XRD and SAXS (Small-Angle Xray Scattering) werereported in the literature for the nanoporous silicon. To help interpret the measured diffractionpatterns, and consequently better understand the organization of matter at the local level and to thenanoscale, the modeling technique proved to be the tool of choice. We propose in this work large atomistic models for nanoporous silicon, for which we simulate X-raydiffraction patterns. We pay special attention to the size effect of nanopores as well as the effect ofporosity rate on X-ray diffraction patterns. A detailed quantitative analysis of simulated patterns ispresented and comparison with available experimental data is made.
Key words:microstructure, modeling, nanoporous silicon, small-angle X-ray scattering, X-ray diffraction.
[RAM 2016]
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Hammamet, Tunisia, September 16-18, 2016
Influence of iron concentration on the physical properties of sprayed Fe2O3 thin films Rihab Ben Ayed*, MejdaAjili* and NajouaKamounTurki* *
Laboratoire de Physique de la Matière condensée, Faculté des Sciences de Tunis, Tunis El Manar 2092, Tunisia. e-mail address :
[email protected]
Abstract: Synthesis of iron oxide (Fe2O3 ) thin films on glass substrates was carried out by chemical spray pyrolysis technique, with a view to investigate the effects of variation of iron concentration ( C= [Fe3+] = 0.06, 0.1, 0.14, 0.2 and 0.3 mol.l-1) on the physical properties of the films. Structural characterization of the layers obtained by X-ray diffraction (XRD), revealed that they were α-Fe2O3. The best crystallinity was obtained for C = 0.14 mol.l-1since the maximum (104) preferential peak intensity was obtained at this iron concentration. The level of the residualmicrostrain and dislocation density seems to be reduced respectively to the values -0.25 x 10-2% and 1.99 x 108 lines .mm-2. The optical study showed that for C = 0.06, 0.1 and 0.14 mol.l-1,the as deposited films had a transmittance of about 60-80% in [750-2500] nm region of electromagnetic spectrum, but this was strongly reduced to a range of about 30-50% for the other concentrations. The decrease maybe due to the structural change. All these films displayed an average band gap equalsto 2.15 eV for direct transition and 2.01 eV for indirect transition whatever the iron concentration. Photoluminescence measurement were performed on α-Fe2O3 crystals and the analysis revealed the existence of three emission peaks observed at 402, 419 and 484 nm correspond to direct transition band to band. On the other hand, increasingthe concentration up to C = 0.14 mol.l-1 improves the electrical properties. Key words:Chemical spray pyrolysis, Iron oxide, Photoluminescence, Physical properties.
[RAM 2016]
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Hammamet, Tunisia, September 16-18, 2016
Effect of the rear contact and Intrinsic thin layer on the parameters of n(a-Si:H)/i(a-Si:H)/p(c-Si) heterojunction solar cells *
Chedia Aliani , Monem Krichen and Abdelaziz Zouari *
[email protected] [email protected] [email protected]
Abstract: In this work a simple analytical method to simulate the performance of n(a-Si:H)/i(a-Si:H)/p(cSi) heterojunction solar cell is developed. The dark current-voltage characteristics were investigated to determine the effect of metal/semiconductor contact on the local ideality factor𝑛𝑛1 (𝑉𝑉). It is
demonstrated that the voltage across the series resistance, calculated from𝑛𝑛1 (𝑉𝑉), follows the Ohm's law. Furthermore, the results obtained in this study show that the alloys Al/Ag as a rear contact increases the photovoltaic parameters by comparison with those of the cell wherein the back contact is formed by Al. This enhancement is due to the effective recombination velocity on the back surface and in addition the improvement made by the transport parameters in the base region (p). The effect of an intrinsic a-Si:H thin-layer on the dark current-voltage is discussed and the analytical results show that this layer decreases the saturation current in the space charge region also the diffusion in quasi-neutral regions. The obtained results show a good agreement with the experimental results presented in literature, and might open promising opportunities for enhancing the design parameters of heterojunction solar cells. Key words:Heterojunction solar cell; current-voltage characteristic;ideality factor;series resistance; saturation current.
[RAM 2016]
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Hammamet, Tunisia, September 16-18, 2016
Nanosciences (NS4) PL13 Peter
Langer
New Anti-Cancer Agents Synthesis based on Red, Blue and Yellow Sugars
PL14 Yassen
Al-Soud "Design and Synthesis of Novel 1,2,4-Triazoles as Non-Steroidal Inhibitors of 17-beta Hydroxysteroid Dehydrogenase Type 2"
PL15 Mohammad El-
Substitution Reactions of Organoiron mono-, bi- and trithiocarbonate
khateeb Complexes Houcem
Kchaou Characterization
Of
The
Phase
Transition
Of
[(Ch3)3Nh]Cdcl3
Compound Sondes
Hajlaoui Synthesis,
structural characterization and vibrational spectroscopy
accomplished
with
DFT
calculation
of
the
organic-inorganic
[(C3H7)4N][SnCl5(H2O)].2H2O compound Jedli
Hedi
Adsorption Of Super Critique Co2 On Various Clays: Isotherm, And Kinetic Study
Rouis
Wiem
Direct Photocurrent Mapping Of Inorganic Inas/Ingaas/Gaas Solar Cell Using A Near-Field Scanning Optical Microscopy
Elwej
Rim
Hydrothermal synthesis, Characterization by single crystal XRD, structural
discussion
and
electric,
dielectrical
properties
of
(C6H9N2)2(Hg0.12Zn0.88)Cl4 hybrid compound Ahmad
[RAM 2016]
Al-
Environmentally Safe Oxidants using H2O2 and O2 Catalyzed by
Ajlouni
Transition Metals
Page 58
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Hammamet, Tunisia, September 16-18, 2016
New Anti-Cancer Agents Synthesis based on Red, Blue and Yellow Sugars Dennis Kleeblatt, Friedrich Erben, Stefanie Libnow, Martin Hein, and Peter Langer* *Institut für Chemie, Universität Rostock, Albert-Einstein-Str. 3a, 18059 Rostock, Germany
[email protected]
Abstract: Red-, blue and yellow sugars are carbohydrate derivatives of indigoid bis-indoles, such as indigo, indirubin and isoindigo. In recent years, it has been shown that these compounds show activity against various human cancer cell lines based on their action as inhibitors of several kinases, such as CDKs and GSK-3β. We have demonstrated that thia- and selena-analogues of glycosylated indirubins are good candidates for the treatment of malignant melanoma. In this paper, we reportrecent resultsrelated to the synthesis of carbohydrate derivatives of indigo, its isomers and their hetero analogues and their pharmacological evaluation.
Key words: carbohydrates, anti-cancer drugs, heterocycles, organic synthesis. H2N
OH
O
H3C Cl
NH
OH
OO
O
N N H
O Akashine A
[RAM 2016]
O
Cl
AcO
N O OAc
OAc Natura
H3C HO
O
N
S O
OH OH Thia-analogous β-L-rhamnosyl indirubin
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Hammamet, Tunisia, September 16-18, 2016
Design and Synthesis of Novel 1,2,4-Triazoles as NonSteroidal Inhibitors of 17-beta Hydroxysteroid Dehydrogenase Type 2 Yaseen A. Al-Soud1* and Rolf W. Hartmann
2
1*Department of Chemistry, College of Science, University of Al al-Bayt, Al-Mafraq, Jordan 28.2 Pharmaceutical and Medicinal Chemistry, Saarland University, PO Box 15 11 50, D-66041
Saarbrücken, Germany
[email protected] [email protected]
Abstract: 17β-Hydroxysteroid dehydrogenases Type 1(17-HSD1) catalyse the transformation of estrone (E1) into the most potent estradiol (E2), which stimulates cell proliferation and decreases apoptosis. 17β-HSD1 is often strongly overexpressed in estrogen dependent diseases such as breast cancer and endometriosis. Thus, this enzyme is a promising target for the development of selective inhibitors which could be used as novel drugs for the treatment of these diseases. O
OH Z
Y 17-β-HSD1, NAD(P)H
X
+
17-β-HSD2, NAD
HO E1
OH
HO
HO E2
1
Scheme 1
Prompted by the varied biological activities of the azoles, and in continuation of our recent work on the azoles, we herein report on the synthesis of new azoles 1 with evaluation of their activity towards 17β-HSD1 and selectivity with regard to 17β-HSD2, the enzyme which is responsible for the deactivation of E2 into E1. Key words:1,2,4-Triazoles, 17β-Hydroxysteroid dehydrogenases type 2
[RAM 2016]
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Synthesis, Reactions and Characterization of Organoiron Selenocarboxylate Complexes Mohammad El-khateeb* *
Chemistry Department, Jordan University of Science and Technology, 22110, Irbid, JORDAN
[email protected]
Abstract: Heterocyclicironselenocarboxylato complexes CpFe(CO)2SeCO-het C4H3O,
-CH2-2-C4H3S]are
correspondingheterocyclicacidchlorides.
[het = 2-C4H3S, 2-
madefrom(µ-Se)[FeCp(CO)2]2andthe The
CO-substitution
reactions
of
theseselenocarboxylatesby ER3(E = P, R = Ph, OC2H5, E = As, Sb, R = Ph)produced the monosubstitutedproductsCpFe(CO)(ER3)SeCO-het in high yield. The new complexes have been characterized by UV-Vis, IR,1H- and31P-NMR) spectroscopyandelementalanalysis. The structuresof CpFe(CO)2SeCO-2-C4H3S,
CpFe(CO)(PPh3)SeCO-2-C4H3S,CpFe(CO)(AsPh3)SeCO-2-C4H3S
andCpFe(CO)(SbPh3)SeCO-2-C4H3S analysis.Theelectrochemicalbehaviorof
have
beendetermined the
by
X-ray
crystal
thiophenylderivativeshas
structure been
describedapplyingcyclicvoltammetry. An ECE mechanism has been proposed for the oxidation of the dicarbonylcomplex.
Key words:Iron, Subsititution, Selenocarboxylates,Cyclicvoltammetry, Characterization.
[RAM 2016]
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Hammamet, Tunisia, September 16-18, 2016
Characterization of the phase transition of [(CH3)3NH]CdCl3 Compound H. Kchaou*, A. Ben Rhaiem *andK. Karoui * *
Laboratoire de L’Etat Solide, Faculté des Sciences de Sfax-3000 Sfax TUNISIA.
[email protected] [email protected] [email protected]
Abstract: The X-ray powder diffraction patterns show that at room temperature [N(CH3)3H]CdCl3 crystallizes inthe orthorhombic system with Pbnm space group.Threeendothermic peaks at T1 = 355 K, T2 = 372 K and T3 = 415 K were observed by differential scanning calorimetric technique. The vibrational characteristics have been measured at room temperature by infrared spectroscopy (400– 3800 cm-1), and by polarized Raman spectroscopy (10–3800 cm-1) on microcrystals orientated with respect to the organic and inorganic sublattice.The temperature dependences of the real part of dielectric permittivity show a relaxation process at high temperature that can beexplained by reorientational motion of alkyl chains.The modulus plots were characterized by the presence of two peaks associated with the grain and grain boundaries.The temperature dependence of the electrical conductivityσdcand fpconfirm the observed transitions in the calorimetric study.
Key words:impedance spectra; equivalent circuit; electrical conductivity; phase transitions.
[RAM 2016]
Page 62
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Hammamet, Tunisia, September 16-18, 2016
Synthesis, structural characterization and vibrational spectroscopy accomplished with DFT calculation of the organic-inorganic [(C3H7)4N][SnCl5(H2O)].2H2O compound Sondes Hajlaoui*, IskandarChaabane*, Jérôme Lhoste**, Alain Bulou**, Kamel Guidara* *Unité de recherche de la matière condensée, Faculté des Sciences de Sfax, Université de Sfax, BP 1171, 3000 Sfax, Tunisie. ** LUNAM Université, Université du Maine, CNRS UMR 6283, Institut des Molécules et Matériaux du Mans (IMMM), Avenue Olivier Messiaen, 72085 Le Mans Cedex 9, France Email:
[email protected](S. Hajlaoui)
Abstract: The
crystal
structure
refinement
at
room
temperature
shows
that
the
[(C3H7)4N][SnCl5.(H2O)].2H2O compound belongs to the monoclinic compound with P121/c1 space group with the following unit cell parameters a= 8.2699(3) Å, b= 12.4665(4) Å, c = 22.3341(7) Å and β = 92.94(0) °.The crystal arrangement can be described by stacked organicinorganic layers in the c direction with two independent water molecules placed between each two layers. The detailed interpretations of the vibrational properties of the studied compound were performed using density functional theory (DFT) with the B3LYP/LanL2DZ basis set and has enabled us to make the detailed assignments by comparative study of the experimental and calculated Raman and IR spectra obtained in the weavnumber range 0-3800 cm-1. The small difference between experimental and calculated modes predicted by root mean square (RMS) value has been interpreted in terms of effect of intermolecular interactions. Moreover, the superposition analysis of the spectrum of the tetrapropylammonium chloride ligand[(C3H7)4N]Cl with those of the [(C3H7)4N][SnCl5.(H2O)].2H2O compound confirms the presence of the vibration modes of water molecules and the hydrogen bonds in the crystal.
Key words:[(C3H7)4N] [SnCl5(H2O)].2H2O compound; Single-crystal X-ray diffraction; FT-IR FT-Raman spectroscopies; DFT/B3LYP/LanL2DZ calculation.
[RAM 2016]
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Hammamet, Tunisia, September 16-18, 2016
Adsorption of CO2sc on various clays: Isothermandkinetic Study Jedli Hedi 1*, Jbara Absalem 2**, Hedfi Hachem and Slimi Khalifa 3* *
[email protected]
Abstract: In the present study, various cap rocks have been experimentally reacted in water with supercritical CO2 in geological storage conditions (P = 70 bar and T = 80 °C) for 25 days. In order to characterize the potential CO2–water– rock interactions, an experimental setup has been built to provide additional information concerning the effects of structure and surface characteristics changes due to CO2 injection with cap rocks. Also, CO2 adsorption capacities of different materials (i.e. clay evaporate and sandstone) are measured. These samples were characterized by XRD technique. The BET specific surface area was determined by nitrogen isotherms. The physical as well as chemical mechanisms of CO2 retention were determined. Adsorption isotherms were measured at different temperatures 298 K and 350 K.
Experimental data of CO2 adsorption
isotherms were modeled using Langmuir models. Keywords: carbon dioxide storage – adsorption –X-ray diffraction– scanning electron microscopy– thermal analysis.
[RAM 2016]
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Direct Photocurrent Mapping of inorganic InAs/InGaAs/GaAs Solar Cell Using a Near-Field Scanning Optical Microscopy W. Rouis*, M. Haggui**, L. Sfaxi*, R. M’ghaieth*and P. Fumagalli** *
Université de Monastir, Laboratoire de Micro-optoélectroniques et Nanostructures (LMON), Monastir 5000, Tunisie
[email protected] [email protected] [email protected] **
Freie Universität Berlin, Institut für Experimentalphysik, Arnimallee 14, Berlin 14195, Deutschland
[email protected] [email protected]
Abstract:
Direct photocurrent mapping of inorganic InAs/InGaAs/GaAs solar cells using a novel implementation of a near-field scanning optical microscope (NSOM) is described. By rastering the light output from the NSOM through the InZn top contact at two different wavelengths (visible, 800 nm, and near infrared, 1150 nm), it is possible to collect height and photocurrent images simultaneously with a lateral resolution that is governed by the NSOM aperture. In this work, we focus our interest on studying the near-field photocurrent (NPC) of InAs/InGaAs/GaAs quantumdot intermediate band solar cells which is generated by illumination via SNOM. This method is also called scanning photocurrent microscopy(SPCM). Using twowavelengths for illumination (800 and 1150
nm),
we
observed
astrong
correlation
between
the two-dimensional
maps
of
photocurrentdistribution and the topography at 800nm, whilethis correlation decreased more particularly in the QDs absorptionrange at 1150 nm for other samples. We have also successfully identified the photoactive layers in the solar cell. In analyzing the SPCM measurement, many processes were discussed; the lightabsorption, the carrier generation and thecarrier recombination. Indeed, the SPCM technique proves to be a suitable method for the investigation of intermediateband solar cells. Key words:near field scanning near field, quantum dot intermediate band solar cell, InAs/InGaAs/GaAs, SPCM, light absorption, carrier generation and recombination.
[RAM 2016]
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Hydrothermal synthesis, Characterization by single crystal XRD, structural discussion and electric, dielectrical properties of (C6H9N2)2(Hg0.12Zn0.88)Cl4 hybrid compound R. Elwej*a and F. Hlela *a
University of Sfax, Condensed Matter Laboratory, Faculty of Sciences, B.P. 1171, 3000 Sfax, Tunisia. Tel/Fax number: +216 74275541/ +216 74274437
[email protected] [email protected]
Abstract: The new hybrid compound “Bis-2-amino-4-picolinium tetrachloro-mercurate-zincate was prepared by hydrothermal method using HCl as solvent and characterized by XRDand electrical impedance spectroscopy. The XRD reveals that the compound was crystallized in the triclinic system, centrosymetric space group P1 .The AC electrical conductivity and the dielectric relaxation properties were measured in the frequency range of 209 Hz-5 MHz at different temperature. Both Z’ and Z’’ of complex impedance are well fitted to equivalent circuit model. The alternating current (AC) conductivity of the investigated compound obeys the Jonscher law: σ(ω)= σdc + Aωn. Keywords: Hybrid structure,Dielectric,Permittivity, Modulus.
π-
[RAM 2016]
π-
Page 66
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Environmentally Safe Oxidants using H2O2 and O2 Catalyzed by Transition Metals Ahmad M. Al-Ajlouni Basic Sciences Department, College of Science and Health Professions, King Saud binAbdulaziz University for Health Sciences, Riyadh 11481, Kingdom of Saudi Arabia. Department of Chemical Science, Jordan University of Science and Technology, Irbid 22110, Jordan. Email:
[email protected],
[email protected]
Abstract: Catalytic activation of hydrogen peroxide in water is of greatest environmental importance. We have been working on the catalytic activation of peroxides by transition metal catalysts toward oxidation of organic and inorganic substrates. Different Mo(VI), W(VI) and Mn(III) complexes are under investigation in our laboratory. We have prepared and design series of Mo(VI) and Mn(III) Schiff-base catalysts and studied their activity in oxidation of organic substrates by peroxides, such as epoxidation. Detail kinetic and mechanistic studies are all carried out in order to understand the role of the catalyst and the effect other variables, such as concentrations, solvent and temperature, on the reaction. We have found that the metal activates the peroxide by forming a metal-peroxo species, which is able to transfer an O atom to the organic substrate. It has been demonstrated that the presence of electron-withdrawal group(s) on the metal catalyst enhances its activity. Key words:Kinetic Study, Oxidation, Metal Peroxides, Catalytic, Green Chemistry
[RAM 2016]
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Nanosciences (NS5) PL16 Anatolie Sidorenko
Functional Nanostructures for Microelectronics of 21st Century
PL17 Bothina
Hamad
Material design for thermoelectric energy harvesting
Amouri
Evidence
Amira
of
magnetoelectric
coupling
in
0.9BiFeO3-
0.1Ba[Ti0.95(Yb0.5Nb0.5)0.05]O3 ceramic Imen
Djemel
Electrocaloric Effect Of Bstz Ceramics
Turki
Olfa
Ferroelectric And Dielectric Anomalies Properties Of Samarium-Modified Nbt-6Bt
Farhat
Mizouri
Dielectric
and
magnetic
properties
of
(1-x)
BiFeO3-x
(Ba0.9Ca0.1Ti0.9Sn0.1)O3 newmultiferroic ceramics Manel
Houda
Ben
Structural And Ferroelectric Properties Of Bctz Ceramics Prepared By
Abdessalem
Solid State
Zaghouene
Electrocaloric Effect Of Lead-Free (Ba0.95Ca0.05)0.8875Bi0.075Tio3 Ferroelectric Ceramic
Manel
Missaoui
Preparation of (1-x) BiFeO3 / x [(BaTiO3) (1-y) / (NaNbO3) y] multiferroïc ceramics
Mourad
Smari
Correlation Between Structural, Magnetic And Electric Properties Of La0.5Ca0.3Te0.2Mno3 Based On The Study Of The Critical Behavior
[RAM 2016]
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Functional Nanostructures for Microelectronics of 21st Century A. S. Sidorenko Institute of Electronic Engineering and Nanotechnologies ASM, MD2028 Kishinev, Moldova E-mail:
[email protected]
Abstract: Theory of superconductor-ferromagnet (S-F) heterostructures with two and more ferromagnetic layers predicts generation of a long-range, odd-in-frequency triplet pairing at noncollinear alignment (NCA) of the F-layers magnetizations. Following the ideas of the superconducting triplet spin-valve we have detected that triplet pairing: switching of the proximity effect coupled Co/CoOx/Cu41Ni59/Nb/Cu41Ni59 heterostructures from normal to superconducting state. The resistance of the sample as a function of an external magnetic field shows that the system is superconducting at the collinear alignment of the Cu41Ni59 and Co layers magnetic moments, but switches to the normal conducting state at the NCA configuration. The existence of the Tc minimum at the NCA regime is consistent with the theoretical prediction of the long-range triplet pairing appearance. The observed memory effect, caused by generation of the triplet pairing at noncollinear magnetic configurations in the investigated nanostructures, seems to be promising for practical applications in superconducting spintronics. The support by A.v.Humbold foundation grant “Institutspartnerschaften”, and STCU research project “Experimental investigation of the proximity effect in layered superconductor/ferromagnet hybrid structures”(registered STCU number # 5982), is gratefully acknowledged. Key words: Nanostructures, spintronics, superconductivity
[RAM 2016]
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Material Design for Thermoelectric Energy Harvesting Bothina Hamad1,2 1. Department of physics, The University of Jordan, Amman-11942, Jordan 2. Department of physics, University of Arkansas, Fayetteville, AR 72701, USA
[email protected] [email protected]
Abstract: The vast leap in technology has led to an exponential increase in energy consumption that caused problems like fossil fuel depletion, pollution and global warming, which urges the search for new renewable, clean and sustainable resources. Among these resources are thermoelectric (TE) solid state devices. In this talk, I will shed light on the recent investigations of materials that are promising for energy harvesting such as Fe2NbAl Heusler alloy.Using first principle calculations, the maximum power factor (PF) of this alloy was found to be 12×10-3 and 51×10-3 W/mK2 at hole concentrations of ~1.60×1021 and 1.45×10-3 cm-3 for the p-type material and about 18×10-3 and 42×10-3 W/mK2 at electron concentrations of ~1.65×1021 and 1.6×10-3 cm-3 for the n-type at 300K and 800K, respectively. These values are about 10 times higher than that of Bi2Te3, which has been extensively used in the construction of thermoelectric modules. This fact infers that Fe2NbAl is promising for TE applications with high efficiency and low cost fabrication. The PF of Fe2NbAl could also be increased by doping with Cr, Mn and Co at Fe and Nb sites, which indicates higher efficiencies and potential thermoelectric applications.
Key words:Thermoelectric, power factor, Fe2NbAl Heusler alloy, ab-initio calculations
[RAM 2016]
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Hammamet, Tunisia, September 16-18, 2016
Evidence of magnetoelectric coupling in0.9BiFeO30.1Ba[Ti0.95(Yb0.5Nb0.5)0.05]O3 ceramic A.AMOURI, N. ABDELMOULA, H.KHEMAKHEM Laboratoire des Matériaux Multifonctionnels et Applications (LMMA), et Applications, Université de Sfax, Faculté des Sciences de Sfax(FSS), Route de Soukra, km3,5, B.P.1171, 3000, Sfax, Tunisia author1@e-mail:
[email protected] author2@e-mail:
[email protected] author3@e-mail:
[email protected]
Abstract: A 0.9BiFeO3-0.1Ba[Ti0.95(Yb0.5Nb0.5)0.05]O3 ceramic is synthesized by conventional solidstate reaction method and investigated by structural, 57Fe Mössbauer spectroscopy, dielectric, Raman spectra, and magnetization properties. At room temperature, X-ray diffraction showed that this sample crystallized in tetragonal distorted perovskite structure with space group P4mm. Analysis of gradual structural evolution, as temperature increases, show that ceramic transforms into pseudo-cubic phase. Rietveld refinement reveals a very remarkable change of the Fe-O-Fe distorted angle and a significant shift in the atomic positions near the Neel temperature transition TN.The evolution of 57Fein-situ Mössbauer spectrums according to temperatures in the range of 300 – 650 K allows the determination of the magnetic transition temperature (TN∼568 K). In fact, at temperatures below the Neel one, Spectra show six lines pattern which turn intodoublet, above TN, expressing paramagnetic order. By following magnetic hyperfine modulation parameters, magnetic transition from modulated antiferromagnetic ordering to paramagnetic one is confirmed.Temperature dependence of the real part of the permittivityε′r and the dielectric loss tanδat different frequencies were investigated.During its evolutions, an anomaly has been detectedat around 568 K which corresponds to TN, as confirmed by 57Fe Mössbauer spectroscopy. A magnetic property is confirmed by the magnetic hysteresis loop (M–H) at room temperature. That revealed an antiferromagnetic behavior. The saturated magnetization Ms, at 29 kOe, the remnant magnetization Mr and the coercive field Hc were of 1.454 emug-1, 0.266 emug-1 and 434 kOe, respectively. These results prove the enhancement of the magnetic properties compared to undoped BiFeO3. Temperature-dependent Raman bands investigation confirms antiferromagnetic transition. Furthermore, these results reveal considerable spectral changes in the vicinity of the Neel temperature TN. Such behaviors indicate the existence of strong spin–phonon coupling in our sample. This study suggest that 0.9BiFeO3-0.1Ba[Ti0.95(Yb0.5Nb0.5)0.05]O3 bulk is a promising candidate for magnetoelectric coupling. Keywords:Ceramic,Structural distortions, 57Fe Mössbauer, dielectric, Raman, Magnetic.
[RAM 2016]
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Electrocaloric effect of BSTZ ceramics I. Djemel*, I. Kriaa *, N. Abdelmoula*and H. Khemakhem * *
Laboratoire des matériaux ferroélectriques (LMF), LR-Physique-Mathématiques et Applications, Université de Sfax, c, route de Soukra Km3.5, BP1171, 3000 Sfax, Tunisie.
[email protected] [email protected] [email protected] [email protected]
Abstract:
The ceramics BSTZ were prepared via the method of solid-state reaction. The aim of this work is to study the evolution of electrocaloric effect depending on the temperature for different electric fields. The electrocaloric study our compound is based on the indirect method. The best value (∆T) and / or entropy (∆S) is obtained when the field E = 10 KV / cm. Thus, in our study, we find that this effect increases electrocaloric following a doping Sn.
Key words:Ceramic, Ferroelectric, Perovskite, Electrocaloric.
[RAM 2016]
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The Samarium effects on dielectric, piezoelectric and ferroelectric properties in NBT-6BT O.Turki*, A.Slimani *,L. Seveyrat**, Z. Sassi**, V. Perrin **, L.Lebrun ** and H. Khemakhem* *
Laboratory of Ferroelectric Materials, LR (R13ES22), Faculty of Sciences of Sfax, University of Sfax, BP 1171, 3000 Sfax, Tunisia *
[email protected] [email protected] [email protected] **
Univ Lyon, INSA-LYON, LGEF, EA682, F-69621, VILLEURBANNE, FRANCE
[email protected] [email protected] [email protected] [email protected]
Abstract: The Samarium (Sm) doped NBT-6BT lead-free
ceramics
were
synthesized
by
conventional solid-state reaction. The effects of Samarium additionon dielectric, ferroelectric and piezoelectric are investigated. Dielectric studies show two diffuse phase transition Td and Tm. These anomalies are discussed in terms of ferroelectric–antiferroelectric andantiferroelectric paraelectric phase transition mechanisms. By Sm-doping, the dielectric properties were improved, which reveals a higher dielectric constant for a small amount of Sm2O3, while the depolarization temperature(Td) tend to decreases to lower temperature. Meanwhile, a good piezoelectric response was obtained for adding a small amount of Sm2O3 in NBT-6BT ceramics and the observation of P– E hysteresis loops showed a slight increase of the remnant polarization (Pr) and reduced the coercive field (Ec). Key words:Ceramics, dielectric properties, ferroelectric, piezoelectric.
[RAM 2016]
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Humboldt - Kolleg Research to Applications & Markets
Hammamet, Tunisia, September 16-18, 2016
Dielectric and magnetic properties of (1-x) BiFeO3-x (Ba0.9Ca0.1Ti0.9Sn0.1)O3 newmultiferroic ceramics F. Mizouri*, N. Abdelmoula*and H. Khemakhem* *
Laboratory of Ferroelectric Materials, LR, Physique Mathématiques et Applications (R13ES22), Faculty of Sciences of Sfax, University of Sfax, Road Soukra km 3.5, 3018 Sfax, Tunisia
[email protected] [email protected] [email protected]
Abstract: Polycrystalline BiFeO3 - (Ba0.9,Ca0.1Ti0.9Sn0.1)O3 (0 ≤ x ≤ 0.50) [(1 - x) BFO -x BCTS)] ceramics were fabricated by a solid state reaction method. The phase structure,Raman spectra, dielectric and magnetic properties of the (1 - x) BFO - x BCTS ceramics were systematically investigated. The crystal structure of the(1 - x) BFO - x BCTS ceramics transformed from rhombohedral to cubic with increasing x.New features related to the thermodynamic stability of the multiferroic BiFeO3 - (Ba0.9,Ca0.1Ti0.9Sn0.1)O3
ceramics were evidenced. The Raman activity
proved the existence of the local non-centrosymmetry and of some grain boundary characteristics at room temperature.The dependence of dielectric constant on temperature for various frequencies (100 Hz–1 MHz) has been determined. The diffuse transition is observed in the variation of dielectric constant and it provides evidence for the relaxor characteristics. All samples presented weak ferromagnetic ordering, indicating that the substitution of BCTS into the BFO matrix released its potential magnetization. Key words:Dielectric properties,Magnetic and Raman spectroscopy.
[RAM 2016]
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Humboldt - Kolleg Research to Applications & Markets
Hammamet, Tunisia, September 16-18, 2016
Ferroelectric, piezoelectric properties of BCZT ceramic M.Ben Abdessalem*,A.Aydi** ,Zina Sassi*** , N. Abdelmoula* and H. Khemakhem * *
Laboratoire des Matériaux Ferroélectriques (LMF), Unité´ de Physique-Mathématiques 05UR15-04, Université de Sfax, Faculté des Sciences de Sfax (FSS), Route de Soukra km 3,5 – B.P. 1171, 3000 Sfax, Tunisie
[email protected] [email protected] [email protected] **
Université de Sfax, Faculté des Sciences de Sfax, Département de Physique.
[email protected] *** INSA de LYON-Laboratoire de Génie Electrique et Ferroélectricité (LGEF), Bâtiment Gustave Ferrié, 8 rue de la Physique, 69621, Villeurbanne Cedex, France
[email protected]
Abstract: Lead free (Ba(1-x)Cax)(ZryTi(1-y))O3 ceramics were prepared successfully using of solid state reaction technique. The effects of the substitution content on the crystallographic structure. The morphotropic phase transitions from rhombohedral to tetragonal phase around room temperature.As a result, we have been able to present the evolution of the Raman spectra was also studied as a function of various compositions atdifferent temperatures, high dielectric constant, ferroelectric properties and exhibits an excellent pyroelectric response studies of BCZT ceramics. X-Ray diffraction analyses at room temperature showed that these samples crystallized in the tetragonal perovskite structure.The dielectric properties have been investigated as a function of temperature and frequency. The dielectric measurements are carried out in the frequency range 1000 Hz - 20000 KHz, at a temperature ranging between 150 and 500 K. The dielectric measurements show classical ferroelectric
behavior.The
excellent
piezoelectric
coefficient
of
d33=288pC/N,
the
electromechanical coupling factor Kp=40%, high dielectric 9105 at Tc=393 K. Key words:Ceramics, XRD, Dielectric, pyroelectric , Raman spectroscopy.
[RAM 2016]
Page 75
Humboldt - Kolleg Research to Applications & Markets
Hammamet, Tunisia, September 16-18, 2016
Electrocaloric Effect of Lead-Free (Ba0.95Ca0.05)0.8875Bi0.075TiO3Ferroelectric Ceramic H. Zaghouene 1*, H. Khemakhem 2* *
Laboratoire des Matériaux Ferroélectriques (LMF), Unité de Physique-Mathématiques 05UR15-04, Université de Sfax, Faculté des Sciences de Sfax (FSS), Route de Soukra km 3,5 – B.P. 1171, 3000 Sfax, Tunisie
[email protected] [email protected]
Abstract: In this study, (Ba0.95Ca0.05)0.8875Bi0.075TiO3 ferroelectric ceramic was fabricated by a conventional solid-state reaction method. The electrocaloric effect was investigated using P–E hysteresis loop characteristics in a wide temperature range from room temperature. The results showed that the temperature change ΔT could be calculated as a function of temperature using Maxwell’s relation, reaching a maximum value of 0.75 K under an applied electric field of 3.9 kV/mm. Key words:Ceramic, Electrocaloric effect, Ferroelectric,P–E hysteresis loops.
[RAM 2016]
Page 76
Humboldt - Kolleg Research to Applications & Markets
Hammamet, Tunisia, September 16-18, 2016
Preparation of (1-x) BiFeO3 / x [(BaTiO3) (1-y) / (NaNbO3) y] multiferroïc ceramics Manel Missaoui*, Nirina Randrianantoandro** and Mohamed Ellouze* *
Laboratoire des Matériaux Ferroélectriques (LMF), LR-Physique-Mathématiques et Applications, Université de Sfax, Faculté des Sciences de Sfax(FSS), Route de Soukra km3,5 B.P.1171, 3000 Sfax, Tunisie.
[email protected] [email protected] **
Institut des Molécules et Matériaux du Mans (IMMM), Université du Maine, Avenue Olivier Messaien, 72085 Le Mans Cedex, France.
[email protected]
Abstract: Bismuth ferrite is one of the rarest perovskite oxides presenting simultaneously the ferroelectric (TC ≈ 830°C) and the antiferromagnetic order (TN ≈ 370°C) at room temperature. This multiferroic behavior makes such materials promising for multifunctional devices, such as spintonic devices, capacitors andmagnetoelectric memories with low energy consumption… BiFeO3 has a rhombohedral structure with R3C group space. Magnetically, BiFeO3 presents an antiferromagnetic G-type order and a modulated cycloïdal spin structure having a long periodicity of 62 nm. Although bismuth ferrite presents two transition temperatures above room temperature, yet its magnetoelectric coupling still not strong, and the value of the maximum of permittivity is too low. Moreover, the major problem of BiFeO3-based ceramics is the current leakage affecting the dielectric measurements. Adding to that thedifficulty of synthesis of pure single phase BiFeO3. For these reasons, we chose to substitute the BiFeO3 with a ferroelectric material. The substitution with BaTiO3- being the most famous ferroelectric material- was widely studied and results confirm the increase of resistivity and of permittivity maxima, and the drop of current leakage. In other hand, many papers studied the dielectric properties of barium titanate (BaTiO3) doped with sodium niobate (NaNbO3)(called BTNN system), and it exhibit interesting results as dielectric free lead ceramics. In this workshop, we present the first results of our study of the BFO/BTNN system combination. We used X-ray diffractionto verify the purity of our samples and to fix the different structural parameters. These results were confirmed by57Fe Mössbauer spectroscopy used to follow the evolution of magnetic order as the substitution with BTNN increases. Key words:BiFeO3, Ceramics, Mössbauer spectroscopy, Multiferroïc system, X-ray diffraction.
[RAM 2016]
Page 77
Humboldt - Kolleg Research to Applications & Markets
Hammamet, Tunisia, September 16-18, 2016
Correlation between structural, magnetic and electric properties of La0.5Ca0.3Te0.2MnO3 based on the study of the critical behavior M.Smari1, I.Wallha1 and E. Dhahri1 Laboratoire Physique Appliquée, Faculté des Sciences, Université de Sfax, B.P. 1171, Sfax 3000, Tunisia
[email protected] [email protected] [email protected]
Abstract: The structural, magnetic and electrical properties are studied. The structural study showed that our compound crystallizes in the orthorhombic structure of Pnma space group. The study Hirshfeld surface reflects both the electrostatic intermolecular interactions are short range. Furthermore, this study verified that the magnetic interactions are still at close range. The values of the critical exponents obtained from the resistivity are very close to those predicted by the mean field tri-critical model. These results are in good agreement with the analysis of critical exponents from magnetic measurements. This study shows a descriptive report of a correlation between structural, magnetic and electrical properties.
Key words:Perovskite manganite; Hirshfeld surface; Critical behavior; Critical exponents; Magnetic phase transition.
[RAM 2016]
Page 78
Humboldt - Kolleg Research to Applications & Markets
Hammamet, Tunisia, September 16-18, 2016
Nanosciences (NS6) PL18 Michael
Schreiber
Self-assembly of ferromagnetic colloidal particles - stirrers and movers actuated by oscillating fields
PL19 Hichem
Eleuch
Population transfer and pulse propagation in atomic media
PL20 Ahmad
Telfah
Real time Investigations of living cancer cells by using Nuclear Magnetic Resonance (NMR) based on planar waveguide NMR detector
PL21 Marian
Jaskula
“Nanoporous oxide layers as potential drug delivery systems”.
Rachid
Masrour
Modeling Of The Magnetocaloric Effect In Ni2Mnga Materials
Rihab
Hamdi
Magnetic Memory Effect In Dy0.5(Sr0.7Ca0.3)0.5Mno3 Manganites
Kheyria
Sbissi
New Complex Magnetic Materials For An Application In Refrigerator
Fares
Ben
Magnetocaloric Effect And Magnetic Properties Of La0.67Ba0.22Sr0.11Coo3
Jemaa
Perovskite Oxide
Safwen
Investigation of magnetic phase transition and dielectric properties of ceramic
Elkossi
system La0.7Sr0.25Na0.05Mn0.9Al0.1O3
[RAM 2016]
Page 79
Humboldt - Kolleg Research to Applications & Markets
Hammamet, Tunisia, September 16-18, 2016
Self-assembly of ferromagnetic colloidal particles – stirrers and movers actuated by oscillating fields Michael Schreiber*, Artur Erbe+,Sibylle Gemming*+ and Gabi Steinbach*+ *
Technische Universität Chemnitz, Institute of Physics, 09107 Chemnitz, Germany
[email protected] [email protected]
+
Helmholtz-Zentrum Dresden-Rossendorf, Institute of Ion Beam Physics and Materials Research, Bautzner Landstraße 400, 01328 Dresden, Germany
[email protected] [email protected]
Abstract: Magnetic colloidal particles are suitable model systems for the investigation of complex self-assembly on the microscale. They facilitate the study of spontaneous and remotely controlled magnetic ordering processes in real space via transmission light microscopy. We demonstrate the potential of dispersed particles with asymmetric magnetization distribution. The asymmetry enables the design of complex networks and different clusters with structural/magnetic variability. Experimentally, we observed spontaneous formation of branched structures as a result of two coexisting self-assembly patterns, which is atypical for homogeneous systems. We show that the structural bistability can be reproduced by a model of spheres with radially shifted point dipoles. The interacting particles exhibit interesting non-equilibrium dynamics when exposed to timedependent fields. Reversible structural reconfigurations emerge from the anisotropic interactions between the shifted net magnetic moments. Under a combination of static and oscillating fields various structures can be created in a controlled and reversible way. We present a concept for the actuation of structurally non-deformingobjects under oscillating fields in a highly viscous environment, aprocess which so far is considered impossible. If the composing particles exhibit an off-centered dipole moment, an oscillating field, whichinduces only reciprocal motion on a single rigid particle, can propelsuch self-assembled clusters of colloidal particles that are held together solelyby magnetic forces. This unexpected experimental observation can be understood when taking into account that the magnetic interaction between such particlesin the cluster breaks time-reversal symmetry under oscillating fields.The respective magnetic configuration of a cluster determines itsmotion path. It can range from rotation over helical to directedpaths, where the orientation of the latter can be controlled by anadditional constant, weak magnetic field. The presented concept establishes a counterpart to the actuation of deforming objects, suchas artificial flagella, in oscillating fields, and to motion in rotating fields. Key words:actuation, anisotropic particles, magnetic colloids, microscopy, microswimmer.
[RAM 2016]
Page 80
Humboldt - Kolleg Research to Applications & Markets
Hammamet, Tunisia, September 16-18, 2016
Population transfer and pulse propagation in atomic media H. Eleuch Institute for Quantum Science and Engineering, Texas A&M University, College Station, Texas 77843, USA
[email protected]
Abstract: The first part of the talk deals with the excitation of atomic coherence using an off-resonant strong ultrashort laser pulses. Intense ultrashort pulses can excite remarkable coherence on high-frequency far detuned transitions and consequently multiphoton processes appearing due to the counter-rotating terms in the interaction Hamiltonian can substantially enhance population transfer in the two-level system. One can suppress such processes,e.g., by making the applied driving field circularly polarized. As a consequence, predictions of this work can be tested experimentally in various regimes using circularly or linearly polarized driving fields. This coherence holds promise for various applications such as the realization of the quantum memory. In the second part of the talk, analytical results for the pulse propagation in dense atomic media will be presented. Key words:Atomic Coherence, Population Transfer, Pulse Propagation, Analytical Results.
[RAM 2016]
Page 81
Humboldt - Kolleg Research to Applications & Markets
Hammamet, Tunisia, September 16-18, 2016
Real time Investigations of living cancer cells by using Nuclear Magnetic Resonance (NMR) based on planar waveguide NMR detector Ahmad Telfah, Jörg Lambert and Roland Hergenröder Bunsen-Kirchhoff-Str.11,44137 Dortmund, Germany
[email protected] [email protected]
Bunsen-Kirchhoff-Str.11,44137 Dortmund, Germany
[email protected]
Abstract: NMR spectroscopy is a reliable analytical method which gives comprehensive and rich chemical information about the composition of unknown materials. Typical NMR analyses are carried out in 5 mm sample tubes with approximately 700 µL sample, measuring small and ultrasmaller samples volumes are not accessible due to the limit of detection (LOD). Moreover, ensuring the viability and the proper living condition of cancer cell using the traditional NMR detectors is critical. A Microstrip NMR detector was designed to enable investigations of volume-limited samples in the low nanoliter range. Therefore, NMR spectra of sample quantities in the 100 pmol range can be obtained with this microprobe in a few seconds. Moreover, the planar geometry of the detector is suitable to the size and geometry requirements such different kind of microfluidic cellular sample holders. Since NMR is a nondestructive technique and high speciation performance, it is one of the major technologies for metabolic profiling, hence allows in vivo measurements of biological cells. In my investigations, I focus on metabolic analysis of living human cancer cells by using the Nuclear Magnetic Resonance, since the cell metabolism and its link to the signaling pathways have got special interest. The lack of proper analytical device and techniques for investigation the metabolism of living cell is the main constrains in this field. Therefore, I designed and fabricated a novel miniaturized microslot NMR detector with on-board heater integrated with a special NMR microfluidic. For the first time, a real time NMR investigations have been performed for a tumor spheroid. The dynamic processes of production and degradation of cellular metabolites were monitored. The high concentrations of lactate and alanine were observed, being an indicator for a shift from oxidative to glycolytic metabolism. A cellular microfluidic NMR sample holder was designed with temperature and proper gas atmosphere controlled environment in order to maintain the viability of the studied living cells at near physiological conditions for the long-term in vitro studies. Additionally, living cancer cells will be treated with anti-cancer drugs, the real time metabolomics respond will be investigated with the microslot NMR detector. Analyses will be employed to understand the molecular mechanism of anticancer drugs action, and to find out the transport mechanism through the cellular membrane, the pseudo-first-order rate constant for the reaction of anti-cancer drug with water will be defined, which is indeed a very important factor to monitor the efficiency, aging and degradation of metal-based anti-cancer drugs. Key words:Cancer cells, NMR, Microslot NMR
[RAM 2016]
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Humboldt - Kolleg Research to Applications & Markets
Hammamet, Tunisia, September 16-18, 2016
Nanoporous oxide layers as potential drug delivery systems M. Jarosz. A. Pawlik. G.D. Sulka. M. Jaskuła Department of Physical Chemistry & Electrochemistry, Jagiellonian University in Krakow, Ingardena 3, 30060 Krakow. Poland Email:
[email protected]
Abstract: The nanoparticles of various materials have very different, sometimes surprising applications. One of such interesting systems are oxide layers which can be use for transportation and controlled delivery of drugs. Among them the titanium dioxide (ATO) plays an important role because metallic titanium and its alloys are nowadays widely used as implant materials. They possess variety of advantages such as biocompatibility, non-toxicity and corrosion resistance. However, some drawback also occurs during the utilization. Therefore, finding a novel material that will reduce those downsides is of great importance. An oxide layer on Ti substrate enables to hasten the osseointegration between an implant and a bone. Such layer may be easy create by simple and low-cost anodization process. Moreover, anodization process allows to control the parameters of porous titania layer since pore diameter and oxide thickness are extremely important for osteoblastlike cells growth. One of the main drawbacks of titanium implants are bacterial infections that may occur during or after the operation. Some of the bacteria strains are extremely resistant to the most commonly used antibiotics. Infections may lead to implant failure, re-operations and prolonged hospitalization of the patient. Hence, an infection-free materialsare desired. In case of nanoporous ATO layers, there is a possibility to implement some antibacterial or antiinflammatory compounds inside pores. Therefore, ATO layers may act as drug delivery systems. We have conducted experiments regarding loading and releasing drugs such as ibuprofen and gentamicin inside ATO pores. Both medicines are quite easily loaded inside nanopores. Furthermore, the release profiles show extended in time release of those drugs to the PBF solution. The results show that nanoporous anodic titanium dioxide layers may be applied as a potential drug delivery systems, in particular when it comes to bone implants. Keywords: drug delivery, gentamicin, ibuprofen, implant, nanoparticles, titania dioxide,
[RAM 2016]
Page 83
Humboldt - Kolleg Research to Applications & Markets
Hammamet, Tunisia, September 16-18, 2016
Modeling of the magnetocaloric effect in Ni2MnGa materials R Masrour*, A. Jabar** Laboratory of Materials, Processes, Environment and Quality, Cady Ayyed University, National School of Applied Sciences, 63 46000, Safi, Morocco. * Address of Author 1
[email protected] **
Address of author 2
[email protected]
Abstract: Magnetic properties and magnetocaloric effect of the compound Ni2MnGaare studied by means of Monte Carlo simulation. The compound Ni2MnGais considered as composed by ferromagnetic. The thermal magnetization, dM/dT, magnetic entropy and the specific heat of Ni2MnGaare given for different values of magnetic field and exchange interactions with a fixed crystal field. The temperature dependence of the magnetic entropy and of the adiabatic temperature for different values of magnetic field, exchange interactions with a fixed crystal field are also find. The Curie temperature is obtained. The field dependence of relative cooling power of Ni2MnGahave been obtained for different values of exchanges interactions and magnetic field. The magnetic hysteresis cycle of Ni2MnGais obtained for different values of exchanges interactions and different values of temperatures. Key words:Ni2MnGa, Magnetocaloric effect, Entropy, Monte Carlo simulation.
[RAM 2016]
Page 84
Humboldt - Kolleg Research to Applications & Markets
Hammamet, Tunisia, September 16-18, 2016
Magnetic memory effect in Dy0.5(Sr0.7Ca0.3)0.5MnO3 manganites *
*
*
*
R. Hamdi 1 , A. Tozri 2 , M. Smari 3 , E. Dhahri 4 and L. Bessais5
**
*
Address of Authors 1, 2, 3 & 4
[email protected] [email protected] [email protected] [email protected] **
Address of author 5
[email protected]
Abstract: In this work, we investigatethe effect of Ca substitution in the appearance of magnetic memory effect in Dy0.5(Sr1-xCax)0.5MnO3(x = 0.3) manganitesannealed at different temperatures. Magnetization measurements depict the presence of magnetic memory effectin only samples substituted with Ca (x = 0.3), while it does not exist in samples with x = 0 of Ca amount.This can lead us to confirm that Ca substitution hasa great role on the appearance of magnetic memory phenomenon which is mainly due to the inter-particle interactions. Key words:Manganites, Magnetic memory effect, Nanoparticles,Zero field cooled/Field cooled magnetizations.
[RAM 2016]
Page 85
Humboldt - Kolleg Research to Applications & Markets
Hammamet, Tunisia, September 16-18, 2016
New complex magnetic materials for an application in refrigerator Kh. Sbissi*, M.L. Kahn**and M. Ellouze* *
Address of Author 1 & Author 3
[email protected] [email protected] ** Address of author 2
[email protected]
Abstract: This paper studies the effects of the Mn-site substitution by Fe on the magnetic properties and the magnetocaloric properties of Pr0.8Bi0.2FexMn1-xO3 elaborated by a sol-gel method. The variation of the magnetization as a function of temperature and applied magnetic field were carried out. Magnetic measurements show that all the materials exhibit a paramagnetic–ferromagnetic transition when the temperature decreases. The dependence of the Curie temperature (TC) and the magnetic entropy change (ΔSM) when varying the Fe doping content was investigated. The measured value of TC was 114 K, 97 K, 94 and 77 K for x = 0, 0.1, 0.2 and 0.3, respectively. The samples with x = 0 and x =0.1 present a second order phase transition, while the samples with x = 0.2 and x=0.3 exhibit a first order phase transition. As the concentration of Fe increases, the maximum entropy change,, decreases gradually, from 2.77 J. kg−1. K−1 (x = 0) to 1.05 J. kg−1. K−1 (x = 0.3), when the magnetic field changes from 0 to 5 T. Key words:Manganite, Magnetocaloric effect, RCP, sol gel method.
[RAM 2016]
Page 86
Humboldt - Kolleg Research to Applications & Markets
Hammamet, Tunisia, September 16-18, 2016
Magnetocaloric effect and magnetic properties of La0.67Ba0.22Sr0.11CoO3perovskite oxide F. Ben Jemaa*, M. Ellouze*, S. Mahmood** and E.K. Hlil*** * Sfax University, Faculty of Sciences, B. P. 1171 - 3000, TUNISIA.
[email protected] [email protected]
**The University of Jordan, Amman, Jordan
[email protected]
*** Institut Néel, CNRS et Université Joseph Fourier, B. P. 166, 38042 Grenoble, France
[email protected]
Abstract:
Perovskite-type manganites with general formula LaAMn1−xTxO3 (A: divalent alkalielement such as Ba, Sr, Ca etc, and T= Fe, Co and Ti) have many important effects such as magnetocaloric effect (MCE), colossal magnetoresistance (CMR) effect, charge ordering, orbital ordering, isotope effect, etc… have been observed by introduction rare earth or alkaline earth ions in to the Asites, these behaviors of original probably occurs in the systems due tothe mixed-valence state of Mn4+/Mn3+,which explains, a large number of studies have been devoted to the substitution of Mnsite by other elements preferably 3d-ferromagnetic transition metals. In this work, we report the synthesis, structure and magnetic properties of La0.67Ba0.22Sr0.11CoO3 synthesized by sol–gel method. Rietveld refinement from X-ray powder diffraction result shows that samples crystallize in the orthorhombic system with space group Pnma. We have performed also magnetic measurements. Our samples exhibit a paramagnetic to ferromagnetic states when the temperature decreases. The obtained Curie temperature is about 208K.
Key
words:Magnetic
properties,
Perovskite
manganites,
X-ray
diffraction,
Isothermal
magnetization, Magnetocaloric effect.
[RAM 2016]
Page 87
Humboldt - Kolleg Research to Applications & Markets
Hammamet, Tunisia, September 16-18, 2016
Investigation of magnetic phase transition and dielectric properties of ceramic system La0.7Sr0.25Na0.05Mn0.9Al0.1O3 S. EL. KOSSIa,d*, J. DHAHRIa ,E.K. HLILb, K. KHIROUNIc, a
Laboratory of Condensed Matter and Nanosciences, Faculty of Sciences of Monastir, , Tunisia. b institut Néel, CNRS et Université Joseph Fourier,BP 166 ,38042 Grenoble,France. c Laboratoryof Physics of Nanomaterials applied to the environnement, Faculty of Sciences of Gabes,Tunisi
Abstract: The
magnetic
phase
transition
anddielectricproperties
of
Polycrystalline
sample
La0.7Sr0.25Na0.05Mn0.9Al0.1O3 prepared by sol–gel synthesis methodhas been studied in detail. X-ray powder diffraction analysis indicates a rhombohedrally distorted structure with a space group R3� C. The inhomogeneous magnetic character coupled with core-shell structure was introduced to explain the magnetic properties of the material. However, a clear magnetic transition from paramagnetic to ferromagnetic state was investigated in term of Banerjee’s criteria and Franco’s universal curves. The electrical properties of this material have beenstudied using ac impedance spectroscopy technique over a wide range of temperaturesand frequency.Detail study of impedance parameters shows the non-Debyetemperature of relaxation phenomena in the system. This analysis enables us to separate grain andgrain boundary contribution of the materials. The dielectric properties and acconductivity in the samples are explained on the basis of space charge polarization according to the Maxwell–Wagner model and the Koop’s phenomenological theory.
Keywords: Manganite;Dielectric properties; magnetic phase transition *
Corresponding author: Tel: 21653180481; Fax: 216 73500278
E-mail address:
[email protected]
[RAM 2016]
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Humboldt - Kolleg Research to Applications & Markets
Hammamet, Tunisia, September 16-18, 2016
Nanosciences (NS7) PL22 Abdelkader
Souifi
Nanostructure-based
Resistive
Random-Access
Memories
for
3D
Access
to
integration PL23 Abdelghani
Adnane
Nanosensors: State of the Art and Perspectives
PL24 Sami
Lakhdar
Metal-Free,
Visible
Light-Mediated
Straightforward
Benzo[b]phosphole Oxides: Synthetic and Mechanistic Studies PL25 Redjem
Hadef
Predictions of Isothermal Fuel-Air Mixing in a Dual-Swirl Gasturbine Combustor
PL26 Mostefa
Belkhatir
Laboratory Study into the Effects of Initial Conditions on the Mechanical Behavior of Over consolidated Granular Sandy Soils
Lotfi
Belkhiri
The contribution of the DFT modeling to the electronic structure and magnetic properties of actinide molecular compounds
Mahmoud
Abdel-Aty
Entanglement Engineering of Many Atoms with Nanoresonators
Mohamed
Zaineb
Effect of iron on the structural, magnetic and magnetocaloric properties of La0.67Sr0.16Ca0.17MnO3 (LSCMO) manganite.
Mohammed Shabat PL27 Samir
El Zein
New artificial materials for solar cell and sensors Daily Stock Select, an online artificial platform for testing stocks trading strategies.
Arwa
Belkahla
Crystal
structure
and
electrical
properties
of
In-doped
La0.7Bi0.05Sr0.15Ca0.1Mn1-xInxO3 manganites Tarek
Hidouri
Localized State Exciton model investigation of B-content effect on optical properties of BGaAs/GaAsepilayers grown by MOCVD
[RAM 2016]
Page 89
Humboldt - Kolleg Research to Applications & Markets
Hammamet, Tunisia, September 16-18, 2016
Nanostructure-based Resistive Random-Access Memories for 3D integration Abdelkader Souifi et al. Institut des Nanotechnologies de Lyon (INL) - UMR CNRS 5270, Villeurbanne, France
Abstract: An attractive alternative for extending the scaling of embedded Flash-type memories is to replace the conventional floating gate by laterally isolated floating nodes in the form of nanoparticles. This floating-gate concept has led to the emergence of the so-called nanocrystal (NC) memories which have the potential of operating at lower voltages and higher speeds compared to the conventional NVMs, without compromising the criterion of non-volatility. The last few years, significant advances have been made in NC fabrication and prototypes of memory-based on NCs for lowpower microcontroller applications have recently been demonstrated. One alternative path to further increase the memory density is to investigate two terminals memory resistive devices such as metal oxide resistive switching memory (OxRAM). This presentation will describe new technological approaches for horizontal and vertical metal/insulator/metal (MIM) with embedded self-aligned nanocrystals (NCs) OxRAMs. Electrical characterization results of the first prototypes of NC-OxRAM memories will be presented
[RAM 2016]
Page 90
Humboldt - Kolleg Research to Applications & Markets
Hammamet, Tunisia, September 16-18, 2016
Functionalized Multiwall Carbon Nanotubes for Toxic Gases Detection A. Thamri, H.Baccar, A. Abdelghani* National Institute of Applied Science and Technology , Nanotechnology Group, 1080 Centre Urbain Nord, Charguia Cedex, Tunisia
[email protected] [email protected] [email protected]
Abstract: We developed sensors employing MWCNTs decorated with gold nanoparticles to improve the sensitivity and the response time of sensors for detecting toxic gases such as DMMP and DMF. Morphological and compositional analysis by Transmission Electron Microscopy (TEM), Fourier Transform Infra-red Spectroscopy (FTIR) and X-ray photoelectron spectroscopy were performed to characterize the gold nanoparticles modified MWCNTs. Additionally, gold nanoparticles loading enhances the kinetics of surface reactions and helps decreasing response time. The detection mechanism and the role of Au nanoparticles will be discussed in light of the experimental findings.
Key words:MWCNTs, Gas sensor, TEM, FTIR
Acknowledgement:This work is funded by the Science for Peace and Security Program of the North Atlantic Treaty Organization under grant no. SFP984511
[RAM 2016]
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Humboldt - Kolleg Research to Applications & Markets
Hammamet, Tunisia, September 16-18, 2016
Metal-Free, Visible Light-Mediated Straightforward Access to Benzo[b]phosphole Oxides: Synthetic and Mechanistic Studies Valentin Quint,[a] Fabrice Morlet-Savary,[b] Jacques Lalevée,[b]Annie-Claude Gaumont,[a]and Sami Lakhdar*[a] [a]Laboratoire de Chimie Moléculaire et Thio-organique, CNRS UMR 6507, Boulevard du Maréchal Juin, 14050 Caen, France, [b] IS2M (LRC CNRS 7228), ENSCMu-UHA, 15 rue Jean Starcky, 68057 Mulhouse Cedex (France)
[email protected]
Abstract: Due to their unique photophysical and electronic properties, Benzophosphole oxide derivatives 1have recently received increasing attention both in organic syntyhesis and material sciences.[1]One of the straightforward ways to access to thesemolecules has recently been reportedby the groups of Duan, Satoh and Miura, using a methodology based on combining secondary phosphine oxides2with alkynes3 in the presence of a stoichiometric amount of Ag(OAc) and at 100 °C.[2] The reaction is described to proceed through a radical process with the formation of the phosphinoyl radical 4as a key intermediate. While this method avoids the use of non prefunctionnalized substrates, it suffers, however, from the disadvantage of requiring high temperature and stoichiometric amount of metal oxidant to generate the active radical species 4. In this work, we show thatmost of these limitations can be circumvented by usingphotoredoxtechnology, where the generation of the phosphinoyl radical 4 is possible under very mild conditions and in the absence of any transition metal. Mechanistic investigations including UV-vis spectroscopy, fluorescence quenching and electron spin resonance (ESR) have been undertaken to understand mechanistic aspects of this photoreaction. [3] O R P H Ph 2 Previous work
I
Ag (1st eq.) Ag
0
R1 O R P
R1
I
3
H
R1
Ag R1 (2nd eq.)
Ag
0
H
P R O
4
PC unstable radical O R P H Ph 2
Organic oxidant
R
P O
PC
PC
R1
R1
P
R1
-H+
+
R1 H
R1
R1
R
O
P R
O 1
Visible light
PC*
PC: photocatalyst
This work: Organic photocatalyst Visible light Oxidant
[1]T. Baumgartner, R. Réau, Chem. Rev. 2006, 106, 4681–4727. [2]a) Y. R. Chen, W. L. Duan, J. Am. Chem. Soc. 2013, 135, 16754 –16757; b) Y. Unoh, K. Hirano, T. Satoh, M. Miura, Angew. Chem. Int. Ed. 2013, 52, 12975 – 12979; Angew. Chem. 2013, 125, 13213–13217. [3] V. Quentin, F. Morlet-Savary, J.-F. Lohier, J. Lalevée, A.-C. Gaumont, S. Lakhdar,J. Am. Chem. Soc.2016, DOI: 10.1021/jacs.6b04069
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Predictions of Isothermal Fuel-Air Mixing in a DualSwirl Gasturbine Combustor R.Hadef *, D. Lalmi** *
Département de Mécanique, Université Larbi Ben M’Hidi, Oum El Bouaghi, Algérie
[email protected] ** UREAR/CDER Ghardaia Algérie
[email protected]
Abstract: The Objective of this work is to verify the capabilities of the Reynolds-Averaged NavierStokes (RANS) approach for simulation of the unsteady three-dimensional two high co-swirling air streams surrounding an annular gaseous fuel stream in a model combustor. The eddy-viscosity modelSST k-ω turbulencemodel coupled with a curvature correction is employed. The time average simulation results comprise the profiles of mean velocities and the Reynolds-stresses componentsas well as the mean transported passive scalar and are directly validated against experimental data. The comparison confirms the weaknesses of the used RANS models especially for the prediction of high swirling flow.
Key words:CFD, Mixing, Swirl, Turbulence,
[RAM 2016]
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Laboratory Study into the Effects of Initial Conditions on the Mechanical Behavior of Overconsolidated Sandy Soils Y. Mahmoudi1, A. Cherif Taiba1, M. Belkhatir1, 2*, T. Schanz2 Laboratory of Material Sciences & Environment, University of Chlef (Algeria.)
1
Laboratory of Foundation Engineering, Soil and Rock Mechanics, Bochum Ruhr University (Germany)
2
Author 1:
[email protected], Author 2:
[email protected] Author 3:
[email protected], Author 4:
[email protected]
Abstract: Liquefaction of sandy soils is associated with a sudden loss of the shearstrength due to a dramatic increase of the excess pore water pressure in undrained conditions.Its occurrence usually causes significant damages to buildings and infrastructures duringearthquakes. Theproposed laboratory research investigation aims to study the effects of the sample depositionalmethods, initial relative density and overconsolidation ratio on the undrained shear strength ofChlef (Algeria) River sand samples subjected to static loading conditions. For this purpose, aseries of undrained monotonic triaxial tests were carried out on reconstituted saturated Chlefsand samples and subjected to different overconsolidation ratios (OCR=1, 2, 4 and 8). Theinitial confining pressure for all tests was kept constant (σ'3= 100 kPa). The samples wereprepared using two depositional methods named: dry funnel pluviation and wet deposition atthree selected relative densities (Dr = 18%, 52% and 88%). The obtained data confirm theexistence of a linear relationship between the undrained peak shear strength ofoverconsolidated Chlef sand samples (qpeak_OC) and undrained shear strength of normallyconsolidated Chlef sand (qpeak_NC) for the two sample preparation techniques (DFP and WD)and range of the initial relative density (18% ≤ Dr ≤ 88%) under consideration. Theoverconsolidation (OCR) and initial relative density (Dr) increase the dilativeness of thenormally
consolidated
and
overconsolidated
sandy
samples
for
the
two
sample
reconstitutiontechniques. The dry funnel pluviated sandy samples exhibit higher undrained shear strength(liquefaction resistance) than the wet deposited sandy samples. Moreover, the obtained datareveal that the wet deposited sandy samples were more vulnerable to liquefaction resistancethan dry funnel pluviated sandy samples for the range of the initial relative density (18% ≤ Dr≤ 88%) and lower overconsolidation ratios (1 ≤ OCR ≤ 4) Keywords:Overconsolidation ratio,Relative density, Sample preparation, Sand, Undrained shear strength
[RAM 2016]
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The contribution of the DFT modeling to the electronic structure and magnetic properties of actinide molecular compounds. Lotfi Belkhiria, Boucenina Seddika, Billel Teyara, Samir Meskaldjia, Michel Ephritikhineb and Abdou Boucekkinec. a
URCHEMS, Départment de Chimie, Université des Frères Mentouri Constantine. IRAMIS, UMR 3299 CEA/CNRS SIS2M, CEA/Saclay, 91191 Gif-sur-Yvette, France. c Laboratoire Sciences Chimiques de Rennes, UMR-CNRS 6226, Université de Rennes 1, France. b
E-mail :
[email protected]
Abstract: Since the first report of the landmark magnetic diuranium(V) para-imido [(MeC5H4)3U]2(µ1,4-N2C6H4) complex by Rosen et al. [1], which exhibits a significant antiferromagnetic 5f1-5f1 coupling, the chemistry of this new class of fascinating bimetallic systems became an active area of research with a great number of experimental X-ray structures and magnetic data provided [1bcd]. The purpose of this work, is computational investigations of electronic structures and magnetic properties of the μ-oxo polynuclear uranium(V) complexes, exhibiting [U(µ-O)2U] core with diamond- and T-shape structural motifs.Two binuclear and U3O3trinuclear magnetic complexes exhibiting U2O2diamond-shape and symmetrical triangular T-shape U3O3 cores, respectively, with 5f1-5f1 and 5f1-5f1-5f1 configurations, synthesized and characterized by K. Meyer et al. and M. Mazzanti et al [2ab]were computationally explored [2c]. The using of the scalar relativistic DFT/ZORA method combined with the Broken Symmetry (BS) approach and the B3LYP hybrid functional, allow a magnetic properties in well agreement with experimental data. Indeed, in the case of the binuclear pentavalent [UV(μ-O)2UV] 5f1-5f1 complex, the BS ground state has been found of lower energy than the high spin (HS) triplet state. This result indicates an antiferromagnetic character in agreement with experimental magnetic susceptibility measurements. As reported for related dioxo diuranium(V) systems, super-exchange is likely to be responsible for the antiferromagnetic coupling through the π-network orbital pathway within the (μ-O)2 bridge, the dissymmetrical structure of the U2O2 core playing a determining role. Finally, the MO analysis, in conjunction with NPA and QTAIM analyses, clarify the electronic structures of the studied complexes. Keywords: actinide compounds,electronic structure, magnetic properties, DFT/ZORA, broken symmetry, 5f orbital. References: [1]
[2]
(a) Rosen, R. K.; Andersen, R. A.; Edelstein, N. M. J. Am. Chem. Soc.1990, 112, 4588 (b) Edelmann, F.T. Coord. Chem. Rev. 2014, 255, 1834(c)Boucekkine A. and Belkhiri L. f-Element Complexes. In: Jan Reedijk and Kenneth Poeppelmeier, editors. Comprehensive Inorganic Chemistry II, Vol 9. Oxford: Elsevier; 2013. p. 277-319. (d) Mills, D. P.; Moro, F.; McMaster, J.; van Slageren, J.; Lewis, W.; Blake, A. J.; Liddle, S. T., Nature Chemistry 2011, 3, 454. (a) Schmidt, A.-C.; Heinemann, F. W.; Lukens, Jr., W. W.; Meyer, K., J. Am. Chem. Soc., 2014, 136, 11980 (b) Chatelain, L. ; Mougel, V. ; Pécaut J.; Mazzanti, M. ; Chem. Sci., 2012, 3, 1075 (c) Billel Teyar, Lotfi Belkhiri, Karine Costuas, Abdou Boucekkine, Karsten Meyer. "Electronic Structure and Peculiar Magnetic Properties of Dioxo-Bridged Diuranium Complexes with Diamond Core Structural Motifs. A Relativistic DFT Study." Inorg. Chem., 2016, 55, 2870.
[RAM 2016]
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Entanglement Engineering of Many Atoms with Nanoresonators Mahmoud Abdel-Aty Vice-president of AfricanAcademy of Science Head of MathematicsDepartment, Zewail City of Science and Technology, Egypt Faculty of Science, Sohag University, Egypt e-mail:
[email protected]
Abstract: In this communication wediscussdifferent aspects of information entropy and its application as an indicator of the quantum entanglement. We focus on the dynamics of multi-atomsystemscoupled to a nanomechanicalresonatorunder influence of both a phonon bath in contact with the resonator and irreversibledecay
of
the
qubits.
Even
in
the
presence
of
enviroment,
the
inherententanglementisfound to beratherrobust. Due to thisfact, togetherwith control of system parameters, the system maythereforebeespeciallysuited for quantum computer. Our findingsalso shed light on the evolution of open quantum many-body systems. Keywords : Entanglement, Nanomechanics,
[RAM 2016]
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Effect of iron on the structural, magnetic and magnetocaloric properties of La0.67Sr0.16Ca0.17MnO3 (LSCMO) manganite. Za. Mohamed1, J. Dhahri1, et E. K. Hlil2 1
Laboratoire de Physique de la matière condensée et des nanosciences, Faculté des Sciences, 5019, Université de Monastir, Tunisia. 2 Institut Néel, CNRS et Université Joseph Fourrier, B.P. 166, B.P.W-38042 Grenoble Cedex 9, France.
[email protected]
Abstract : The present study reports the effect of Fe doping on the structural, magnetic, electrical and magnetocaloric proprieties in the La0.67Sr0.16Ca0.17Mn1-xFexO3 (x =0.00 and x=0.25) perovskites. The studied samples were synthesized as powder samples by solid state reaction at high temperature. Their analysis by powder X-ray diffraction using Rietveld refinement showed that they crystallize in the rhombohedral system with the R3c space group. La0.67Sr0.16Ca0.17MnO3display a paramagnetic (PM)-ferromagnetic (FM) phase transitionat Curie temperature (TC). As previously reported in the literature paramagnetic (PM) to ferromagnetic (FM) phase transition has been observed in materials with low Fe doping (≤10%). In our x= 0.25 compound the Curie temperature (TC) is vanishedand another transitionantiferromagnetic (AFM)-paramagnetic (PM) appeared at Neel temperature (TN). From isothermal magnetization versus magnetic applied field, we deduced the magnetic entropy change ∆S M . Our results are interesting enough and suggest that the compound La0.67Sr0.16Ca0.17MnO3 may be suitable candidate as working substance in magnetic refrigeration. For the undoped compound (x = 0.00) doping electrical-resistivity measurement shows metal–semiconductor transition with a maximum peak of resistivity (ρmax) at a temperature TP close to TC. For 25% of Fe3+ doping amount the material exhibits only semiconductor behavior. Results are consistent with a reduction of the number of available hopping sites for the Mn eg(↑) electron due to substitution of Mn3+ by Fe3+ that suppress the double exchange (DE) interactions. Keywords: perovskite; critical behavior; second-order transition.
[RAM 2016]
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Artificial materials for solar energy applications Mohammed M. Shabat Physics Department, Physics Department, Islamic University of Gaza, Gaza, P.O.Box 108, Gaza Strip, Palestine
[email protected]
Abstract: Solar cells provide a renewable and clean energy by converting the sunlight to electricity. However, it is important to reduce the cost of the solar cell and increase the efficiency in order to be considered as a reliable energy source. In this communication, we present the importance of using new artificial materials as Metamaterials and nanoparticles in design and fabricate solar cells for energy. Numerical techniques as Finite Difference Time Domain method (FDTD), and Transfer Matrix methods are used to discretize the of Maxwell’s curl equations for the proposed structure in order to find out the transmission, reflection and absorption. We found that the new artificial materials are very promising candidates to increase the efficiency of solar cells.
Key words: Metamaterials, Nanoparticles, Finite Difference Time Domain method (FDTD), Transfer Matrix Method, Thin Film Solar Cell.
[RAM 2016]
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Artificial Intelligence strategies for pattern recognition in the stock markets Samir EL ZEIN BIAT, Chamber of commerce, Tripoli Lebanon
[email protected]
Abstract: Artificial intelligence methods are currently playing a key role in innovation technologies. In particular, Machine Learning shows some promising applications like for example the FACEBOOK facial recognition or GOOGLE self driving car... We have created a platform for traders on the stock markets to virtually test their trading strategies. Rather than spending a whole year for testing one strategy, our cloud based engines bring the numerical answer in 5-10 minutes. Several banks and universities are using it now as well as several hundreds finance students and traders around the globe. “Daily Stock Select” is creating state of the art algorithms for artificial intelligence, together with using some CNRS smart algorithms. We will summarize the concept and methodology of our work and the ways of funding and marketing it. Key words: Artificial Intelligence, Machine Learning, Stock Markets, Backtesting, Mathematical finance, Forecasting.
[RAM 2016]
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Crystal structure and electrical properties of In-doped La0.7Bi0.05Sr0.15Ca0.1Mn1-xInxO3 manganites Arwa Belkahla*, K.Cherif** and J.Dhahri* *
Laboratoire de la matière condensée et des nanosciences, Département de Physique, Faculté des Sciences de Monastir, 5000 Tunisie
[email protected] [email protected]
**
Laboratoire de la matière condensée et des nanosciences, Département de Physique, Faculté des Sciences de Monastir, 5000 Tunisie
[email protected]
Abstract: In this paper, we reported the effect of In doping on the structural and electrical properties of the La0.7Bi0.05Sr0.15Ca0.1Mn1-xInxO3 (0 ≤ x ≤ 0.3) samples which were synthesized by the Pechinisol-gel method. X-ray analyses confirm the crystalline nature with single phase rhombohedra structure having R-3c space group for all samples. Magnetic studies revealed that the ferromagnetic-paramagnetic temperature transition decrease with increasing In content from 330 K for x = 0 to 268 K for x = 0.3.The temperature dependence of electrical resistivity shows that all samples present a clear metal to insulator transition and having a peak at transition temperature TMSc.The
doping with In also decreases the transition temperature TM-Sc, in accordance with the
evolution of TC values. These materials indicated that the calculated magnetoresistance (MR) for a magnetic field of 5T increases gradually from 64% for x=0 to 84% for x=0.3. The simulation of the resistivity curves in the entire temperature range show that the percolation model is suitable to fit our results.
Key words:Conduction mechanism, Magnetic properties, Manganites, Percolation.
[RAM 2016]
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Localized State Exciton model investigation of Bcontent effect on optical properties of BGaAs/GaAsepilayers grown by MOCVD Tarek Hidouri, Faouzi Saidi and Hassen Maaref *
Laboratoire des Micro-Optoélectroniques et Nanostructures, Université de Monastir, Faculté des Sciences de Monastir, Avenue de l’Environnement 5019 Monastir, Tunisie
[email protected] [email protected] [email protected]
Abstract: In this work, BxGa1-xAs/GaAsepilayers with three different boron compositions were elaborated by Metal Organic Chemical Vapor Deposition (MOCVD) on GaAs (001) substrate. The boron fraction has been estimated using High resolution X-ray diffraction (HRXRD) spectroscopy. Using the photoluminescence spectroscopy (PL), the emission energy as well as the PL intensity was carried out as functions of temperature in the range 10–300 K. The temperature dependence of the PL peak energy has shown an S-shaped behavior. It is a result of the competition process between localized and delocalized states induced by the boron clusters. We have shown that the localization effects increase by increasing boron composition and then drops for high compositions (up to 8%). Qualitative and quantitative interpretations based on the Localized Exciton Model parameters evolution in order to explain the unusual photoluminescence behavior of the two luminescence keys. At high temperatures, the model can be approximated to the band-tail-state emission. The LSE model succeeds in accurately reproducing of the atypical PL peak emission and normalized intensity of BGaAs/GaAsepilayers.. Key words:HRXDX;Photoluminescence,BGaAs/GaAs, LSE, S-shaped, Normalized intensity.
[RAM 2016]
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Biotechnology (BT1) PL3 Ahmed
Mazzah
Grafting of Amine Functions on Cellulose Acetate
PL4 Ashraf
Abadi
Intellectual Property of New Antiviral Medications
Ali
Performance of Two Underground Cooling Systems in Hot Arid Areas
Muhammed
Alzweiri
Targets for weight lossing
Najeh
Tka
Entiopure Key-Precursors Derived From Natural Amino Acids, Synthesis
Ahmed Hamza
And Investigation In Cyclisation Reactions Ben Yahia
Mohamed Modeling Of Adsorption Isotherms Of Lithium Chloride On A Thin Layer Of Hepta-Hélicènes By Statistical Physics Formalism
Ben Amar
Cheba
The Laser Technology For Fast Growing Biotechnology (An Overview)
Hamada
Elsayed
Extensive management of field margins enhances their potential for off-
Ali
site soil erosion mitigation
Zouaghi
Seasonal variation of the essential oil of fraxinus angustifolia vahl and its
Nafila
antimicrobial properties
[RAM 2016]
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Grafting of amine functions on cellulose acetate Ahmed MAZZAH Université de Lille, CNRS, USR 3290, MSAP, Miniaturisation pour la Synthèse l'Analyse et la Protéomique, F-59000 Lille, France
[email protected]
Abstract: The aim of this work was to graft amino groups on cellulose acetate (CA) by cold plasma at low pressure using either NH3/He (5/95) or N2/H2 (5/95) gases. X-ray photoelectron spectroscopy (XPS) was used to characterise the surface. Results showed that in all cases NH2 groups were successfully grafted onto the surface of the CA fibres. The effects of plasma treatment duration and the plasma gas composition have been investigated. The best results (6.4% NH2 grafting) were obtained with NH3/He (5/95) plasma and a duration of 3000 s. Kinetics studies indicate that the maximum plate was not reached at this time. In other work, the Cellulose acetate tow filters (CA tow) coated with poly (ethyleneimine) (PEI) were used to investigate the influence of amine functions in the adsorption of volatile aldehyde from cigarette smoke. The adsorption mechanism is investigated by
13
C CP MAS solid-
sate NMR, and it is demonstrated that the aldehyde are chemically attached to the surface of CA tow in the form of imines and hemiaminals. Using low pressure argon plasma in order to improve the adsorption rate of PEI on CA tow have been investigated. The X-Ray photoelectron spectroscopy was used to study the degree of degradation of the attached PEI polymer caused by the plasma treatment. The modified surfaces are characterized with scanning electron microscopy, Xray photoelectron spectroscopy and electron probe micro-analyser (EPMA).
Key words:cellulose acetate, low pressure cold plasma, ammonia grafting, poly (ethyleneimine), cigarette smoke
[RAM 2016]
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“Intellectual Property of New Antiviral Medications” Ashraf H. Abadi Department of Pharmaceutical Chemistry, Faculty of Pharmacy and Biotechnology, German University in Cairo; Egypt
[email protected]
Abstract: Intellectual property (IP) is among the major factors determining the research and marketing in the field of pharmaceuticals. Hepatitis C Virus (HCV) is one of the most burdening diseases in Egypt and worldwide. The development of Direct Acting Antivirals (DAA), particularly Sofosbuvir is a milestone in eradicating the disease. The price of the medication varies considerably between different countries mainly due to IP issues. This story will be detailed as a model case for the use of IP for the benefit of developing countries. Key words:Intellectual property; hepatitis C virus
[RAM 2016]
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Performance of Two Underground Cooling Systems in Hot Arid Areas Ahmed Hamza H. Ali Mechanical Engineering Department, Faculty of Engineering, Assiut University, Assiut 71516, Egypt.
[email protected] Tel. +20 1223971265
Abstract: This isstudy is presenting an applied research project output which is targeting to designing, implementing and carryout measurement of residential scale subsurface cooling systems in thehot arid area at Upper Egypt.This to compare the cost performance of the two subsurface cooling systems experimentally, the first one is an open loop system using the groundwater as the heat transfer carrier that shown in figure (a), while the second system is using the air as a heat transfer carrier that shown in figure (a). The results in the hottest month in Assiut, Egypt (June) show that both systemshave a significant effect on the indoor thermal comfort at low cost compared with conventional air-conditioning units. Keywords:residential thermal comfort,underground cooling systems, hot arid area cooling.
(a)
[RAM 2016]
(b)
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Targets for weight lossing Dr Muhammed Alzweiri The University of Jordan, Amman, Jordan,
[email protected]
Abstract: Weight loss is a global obsession nowadays since the huge expenses paid for treating the obesity-attributed metabolic syndromes such as diabetes. The talk will introduce basic understanding of caloric-rich nutrients and therapeutic targets of weight loss at the molecular level in order to obtain effective and healthy weight loss regimen. Balancing the food with sufficient amount of proteins fortifies the growth of the muscle mass instead of the adipose tissue. Consequently, the body will consume larger amount of calories to maintain the basal metabolic rate. In addition, muscle cells have more insulin receptors than the adipose tissue. This will minimize the opportunity of insulin resistance occurrence. Moreover, the protein cannot be substituted by the other nutrients. In contrast the glucogenic amino acids can be converted to carbohydrates and lipid whenever necessary. On the other hand, unprocessed food contains better amount of fibers which hardly absorbed from the gut and also it prolongs the feel of fullness as well as induces the secretion of large bile juice quantities. The later will promote the liver to convert larger quantities of cholesterol to bile salts. Hence better lipid profile and weight loss will be obtained. Not all lipids are bad. Omega group oils (e.g. olive oil) are able to increase the level of HDL and decrease LDL, while the fully saturated fatty acids (e.g. palm oil) are the worst because they promotes the lever to denovo synthesize cholesterol. This endogenous cholesterol participates in almost 90% of the total body cholesterol. Lipids give twice the calories of carbohydrates and proteins. Thus lipid profile should be controlled by taking fiber-rich and less lipidogenic food. If necessary, there are effective drugs used in controlling the lipid profile such as resinous drugs which can complex with bile salts, the HMG analogues and the lipase inhibitors.
[RAM 2016]
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Optically Pure Key-precursors From Natural Amino Acids, Synthesis and Invesigation in Cyclization Reactions. Najeh TKA*, Faouzi ALOUI* and Peter LANGER** * Laboratory of asymmetric organic synthesis and homogenous catalysis, Faculty of sciences of Monastir, University of Monastir-Tunisia.
[email protected] [email protected]
**Laboratory of organic chemistry, Institute of chemistry of Rostock, University of Rostock-Germany.
[email protected]
Abstract: Development of efficient methodology to produce optically pure compounds is of fundamental importance, particularly for the synthesis of biologically active products. Optically active compounds can be obtained via three different approaches: the resolution of racemates, the use of enantiomerically pure natural synthons or "chiral pool" and the asymmetric synthesis. In the present work, natural amino acids, commercially available with low cost and high optical purity, have been suitably used as starting material in chiral pool synthesis to lead to a vast variety of enantiopure key-precursors. Amino acids were manipulated through stereospecific reactions to give the desired bielecttrophilic target molecules like: bromo acids chloride, bromo esters, bromo nitriles and binucleophilictarget molecules like: amidoximes, amino alcohols, amino acids hydrazides and amino acids phenyl hydrazides. Cyclization reaction of bromo acid chloride was first examined with amino amidoximes to afford new chiral 1,2,4-oxadiazin-6-ones, known as central nervous system stimulants, with high optical purity. In the same context, we reported a general and efficient method for the synthesis of1,2,4-oxadiazoles, a well-studied pharmacophoric scaffold, by condensing chiral amidoximes derivedfrom (L)-proline with both aliphatic or aromatic aldehydes. The study of the synthetic features of the obtained precursors to prepare new chiral heterocyclic compounds of biological interest is under investigation.
Key words: amino acids, enantiopure precursors, chiral heterocycles, cyclization reactions.
[RAM 2016]
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Modeling of Adsorption Isotherms of Lithium Chloride on a Thin Layer of Hepta-Hélicènesby Statistical Physics Formalism Mohamed Ben Yahia1, Salah Knani1,Manel Ben Yahia1, Moncef Tounsi2and Abdelmottaleb Ben Lamine1 1
Research Unit of Quantum Physics 11 ES 54, Faculty of Sciences of Monastir, Tunisia Interfaces Laboratory and Advanced Materials, (LIMA), Faculty of Sciences of Monastir, Tunisia Mohamed Ben Yahia1:
[email protected], Salah Knani1:
[email protected] Manel Ben Yahia1:
[email protected], Abdelmottaleb Ben Lamine1:
[email protected] Moncef Tounsi2:
[email protected] 2
Abstract The adsorption of a metal ion to a polycyclic aromatic molecule such as Helicene is the object of our study; for it Helicene could function as a chiral molecular clamp for the cationic alkali metal.Throughout the grand canonical ensemble, processing statistical physics has been used for modeling of adsorption isotherms of lithium on a thin layer Helicene.Actually, the Hill model has been chosen as an appropriate one to present a good correlationwithexperimentalisotherms. We have foundthat an increase in temperaturepromotesarise in the number of ions per site and raises the adsorption capacity. The thirdparameter has made us deduct, through the experimentalcurves, the adsorption’
energies
of
the
four
temperatures.
This
energycountingallowed
us
to
concludethatitisindeed a physical adsorption and that the Helicene canfunction as a lithium captor.We can notice that the entropy increases with the adsorbedquantity before the half-saturation and decreases after this particular point. It can also be noticed that for the isotherm studied, the Gibbs free energy is alwaysnegative, meaning the adsorption evolves spontaneously. The study of the internal energy has shown thatthe increase of the concentration always pulls a rise in module of the internal energy of system andduring adsorption the system releases energy outside. Keywords: Adsorption Isotherm; QCM; Lithium Chloride; Helicene; Statistical Physics.
[RAM 2016]
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The Laser Technology For Fast Growing Biotechnology (An Overview) Cheba Ben Amar Department of Biotechnology -Faculty of Nature and Life Sciences-University of Sciences and TechnologyOran Mohamed Boudiaf (USTOMB) Oran -Algeria E. mail :
[email protected]
Abstract: Over the last decades, laser technology has made great progress and explosive developments in biomedical field whereas in biology the laser technology open new eras and opportunities for both academic and applied research and provide new, rapid and very sensitive tools that meet to the fast growing biotechnology and to their complicated multisubdisciplines. In this review we discuses biolasers achievement
listing all most different laser
spectroscopic approaches with special focusing on somme selected and powerful techniques such as Matrix-Assisted Laser Desorption/Ionization-Mass Spectrometry (MALDI-MS), Laser Flow Cytometry(LFC), Laser Tweezers Raman Spectroscopy( LTRS) , Confocal Scanning Laser Microscopy (CSLM) , and whole-cell mass spectrometry (WC-MS) .Furthermore we review their utilities and potential as powerful tools in the bimolecular and biotechnological research ,as well as we discuss how this new laser optical technologies provide new knowledge revolution in biology and how promotes both academic and applied biotechnological researches.
Key words:Laser, techniques, applications, biotechnology,researches
[RAM 2016]
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Extensive management of field margins enhances their potential for off-site soil erosion mitigation Hamada E. Ali1* and Björn Reineking2** Botany Department, Faculty of Science, Suez Canal University, 41522 Ismailia, Egypt
[email protected] Irstea, UR EMGR, 2 rue de la Papeterie-BP 76, F-38402 St-Martin-d’Hères, France
[email protected]
Abstract: Soil erosion is a widespread problem in agricultural landscapes, particularly in regions with strong rainfall events. Vegetated field margins can mitigate negative impacts of soil erosion off-site by trapping eroded material. Here we analyse how local management affects the trapping capacity of field margins in a monsoon region of South Korea, contrasting intensively and extensively managed field margins on both steep and shallow slopes. Prior to the beginning of monsoon season, we equipped a total of 12 sites representing three replicates for each of four different types of field margins (“intensive managed flat”, “intensive managed steep”, “extensive managed flat” and “extensive managed steep”) with Astroturf mats. The mats (n = 15 / site) were placed before, within and after the field margin. Sediment was collected after each rain event until the end of the monsoon season. The effect of management and slope on sediment trapping was analysed using linear mixed effects models, using as response variable either the sediment collected within the field margin or the difference in sediment collected after and before the field margin. There was no difference in the amount of sediment reaching the different field margin types. In contrast, extensively managed field margins showed a large reduction in collected sediment before and after the field margins. This effect was pronounced in steep field margins, and increased with the size of rainfall events. We conclude that a field margin management promoting a dense vegetation cover is a key to mitigating negative off-site effects of soil erosion in monsoon regions, particularly in field margins with steep slopes.
Key words:Soil erosion, field margins, sediment retention, management, slope, agricultural landscape.
[RAM 2016]
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Seasonal variation of the essential oil of fraxinus angustifolia vahl and its antimicrobial properties Zouaghi Nafila1*,Bellal Cherifa 2*, Cavaleiro Carlos3**, Yousfi Mohamed 4***and Nadjemi Boubekeur 5* *
Laboratoire d’étude et de développement des techniques de traitement et d’épuration des eaux et de gestion environnementale. Ecole Normale Supérieure, Kouba, Algeria. *
[email protected] *
[email protected] *
[email protected] **
CNC.IBILI, Faculty of Pharmacy, University of Coimbra, Azinhaga de S. Comba 3000-354 Coimbra. **
[email protected]
***Laboratoire des Sciences Fondamentales, Université Amar Telidji, Laghouat, Laghouat, Algeria.
[email protected]
Abstract: FraxinusangustifoliaVahl, (Oleaceae) was studied for the seasonal influence on the volatile oil yield and composition. The essential oil was isolated by hydrodistillation and the composition was assessed by GC/MS and GC-FID analysis.Essential oil yield was higher in early summer (June .0.0416 % and 0.0412 % in July) comparing with spring yields (March 0.020%), April 0.013 % and May 0.021 %). Concerning the oil composition qualitative and quantitative differences were observed: plant material collected during winter produced oils with relevant amounts of abietatriene (10.9%) and α-cedrol (4.9%) or E-caryophyllene (13.0%), linalool (4.3%) and Germacrene D (4.0%). Plant material collected during spring rendered oils dominated by methyldocosane (30.2%) and pentacosane (28.5%). In early summer the concentration of the diterpenesisopimaradiene and manoyl oxide raise but not exceeding (20.1%) and (5.6%) respectively. α-Cadinol and
-cadinene
concentrations raise in summer to 16.6% and 5.9%, respectively. Oils were also tested against four bacteria (Bacillus subtilis, Staphylococcus aureus, Pseudomonas aeruginosa and Escherichia coli), using the Kirby Bauer disk-diffusion method. All bacteria were susceptible at 300 µg of volatile oil. Keywords: Fraxinusangustifolia; essential oil; seasonal variation
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Biotechnology (BT2) PL5
Heinz
Seliger
Some New Research on the Biomedical Application of Nucleic Acids
Hartmut PL6
Fathy
Abdelrazek Synthesis of Some Novel 1,4-phenylene-bis- Heterocyclic Compounds of Biological Interest
PL7
Mohamed
Zaghloul
OrganiSATional redesIgn for reSearch-based learning (SATIS)
PL8
Helmy
Omran
“Controlling some Native (Endogenous) Enzyme activities in Plant Foods”
PL9
Allal
Ghanmi
Analytic properties of generalized class of complex Hermite polynomials
Al-Hiari
Novel heterocyclic carboxamide derivatives as potential
PL10 Yusuf
antihyperlipidaemic Agents: On Plasma Lipid Profile of Triton-WR-1339Induced Wistar Rats
Dalel
Belhaj
Oxidative stress induced by 17β-estradiol exposure in the Invertebrate Species Eisenia fetida
Houda
Bey
Structure and Dynamics of Complex Coacervates between Lysing enzyme from Trichoderma harzianum and poly allylamine hydrochloride
Mohammad Harb
[FeFe] Hydrogenase Models Containing Different Length Diselenolato Bridging Moieties
[RAM 2016]
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Some New Research on the Biomedical Application of Nucleic Acids H. Seliger University of Ulm, Albert-Einstein-Allee 11, D 89081 Ulm, Germany E-Mail:
[email protected]
Abstract: Due to their specific recognition properties for nucleic acids and proteins oligonucleotides (i.e. short nucleic acid fragments) have a distinct potential for biomedical applications. Work in our laboratory was focused on two approaches using synthetic oligonucleotide derivatives: 1. The antisense approach aims at stable and selective binding of oligonucleotides to the mRNA of a pathogenic protein, thus blocking its expression. 2. The antigene approach targets DNA, thus aims at inactivating the genetic message. Unfortunately, in spite of an enormous input of money and labor, very few oligonucleotide pharmaceuticals have progressed from laboratory to market. This is due to a number of problems: (i) The cellular uptake is difficult. (ii) Inside cells and body fluids synthetic nucleic acids and their derivatives are rapidly degraded. (iii) The biological (therapeutic) action of antisense or antigene oligonucleotides should preferably be complete and irreversible. This is difficult to achieve with structurally modified, chemosynthetic nucleic acids. Examples of (i) antisense and (ii) antigene experiments will be discussed, directed against (i) mutated K-ras protein found in pancreatic tumor cells, or (ii) against mitochondriopathies like MERRF disease. The substitution of antisense oligonucleotides with polyethylene glycol was studied as a route to prolonged drug activity. The synthesis of nanoparticles with unusually high loading of oligonucleotides using the “supporton-support” technique was developed as a means to promote cellular uptake. Alternative methods for biomedical applications of oligonucleotides (for instance si RNA, CRISPR techniques) will be spotlighted.
Key words: Oligonucleotides, Bio-medical applications, Antisense approach, Antigene approach, Cellular uptake, Structural modifications for stability and prolonged activity.
[RAM 2016]
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Synthesis of Some Novel 1,4-phenylene-bis- Heterocyclic Compounds of Biological Interest Fathy M. Abdelrazek Chemistry Department, Faculty of Science, Cairo University, Giza, Egypt. E-Mail:
[email protected]
Abstract: In continuation with our program aiming to develop new simple routes for the synthesis of heterocyclic compounds of biological interest [1-4] we report in this presentation the synthesis of some novel 1,4-phenylene-bis-heterocyclic derivatives, of the type 1-8; Figure 1, of biological interest. Some plausible mechanisms will be discussed. NH O O
NH
O
R
O
NH
NH
NC
R
1
Ph
N
O CN
R
NH
NH
N Ph
S
S
O
O
N
N
S
NN H
N
N
CN
NH2
NH2
N N
N Ar
H N
R
N N R
4 H N
S NN H CH3
NH2
S
N
N
N
7
Ar
N N
H N S CH3
H NN
N N
CH3
S
N H
6
5 S
CN
H2N
NH2
N N R
CN
NC N N Ar
N
R
3
R
H2 N
NC
O
2
O NC
Ar
O
N
H3C S
N N
N H
N
8
Figure 1: Examples of the synthesized compounds
References: 1. F. M. Abdelrazek, N. H. Metwally, N. A. Kassab, N. A. Sobhy; J. Heterocyclic Chem. 2009, 46, 1380-1385. 2. F. M. Abdelrazek, N. H. Metwally, N. A. Kassab, N. A. Sobhy, P. Metz, A. Jaeger J. Heterocyclic Chem. 2010, 47, 384-388. 3. F. M. Abdelrazek, N. H. Metwally, N. A. Kassab, M. T. Jaafer, P. Metz, A. Jaeger J. Heterocyclic Chem.2014, 51, 1785-1790. 4. F. M. Abdelrazek, Y. M. Elkholy, A. M. Salah, N. M. Abdelazeem, Peter Metz; J. Heterocyclic Chem. 2014, 51, 824-829.
[RAM 2016]
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OrganiSATionalredesIgn for reSearch-based learning Mohamed S. Zaghloul, Samira R. Mansour, and Abdel-Raouf A. Moustafa Botany Department, Faculty of Science, Suez Canal University, Ismailia, Egypt.
[email protected] [email protected] [email protected]
Abstract: The SATIS project aims to establish a sustainable triple interacted structure Master degree including research, education and knowledge transfer for economic and societal benefit. Research is incorporated into teaching in order to meet the educational standards of the EHEA and the promotion of young academics’ innovative research approaches. In addition, research results will be brought to practical applications in order to respond to current and future societal challenges. The methodology proposed includes a demonstration pilot around an international MSc program in Ecology at SCU. The piloting MSc study program is based on the transfer of a research demonstration and education approach developed by the University of Bremen for the restoration of degraded soils and the afforestation of drylands (ReviTec®). Establishing a ReviTec® research, teaching and demonstration site at SCU Ismailia, the Egyptian MSc students together with their supervisors become directly involved in ongoing international research activities while learning at the same time according to an innovative educational concept to cope with the pressing problem of desertification. The SATIS project will also contribute to the improvement of university and educational system management driving to better university governance and promoting Egyptian national universities’ collaboration as well as international cooperation. The long established culture of collaboration between different research organizations for common benefit (win-win) is an important strength within the German science system. SATIS will help in setting up a long-term collaboration between Alexandria University and SCU for applied research, establishing the cooperation on specific scientific topics, sharing data and scientific knowledge, at national, continental and international level that will create the conditions for better understanding and solving the arid problems via the arid-specialized scientists. The future scientific outcomes of the project and concretely of the ReviTec site can be directly transferred to Egyptian stakeholders and generate subsequent targeted projects. Key words:Biodiversity, SATIS, research-based learning, ReviTec.
[RAM 2016]
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“Controlling some Native (Endogenous) Enzyme activities in Plant Foods” Prof. Dr. Helmy T. Omran Food Technology Department, Faculty of Agriculture, SCU, Ismailia, Egypt E-Mail:
[email protected] or
[email protected]
Abstract: The study of enzymes is a subjected of special importance for the food scientists in two aspects: The first one: Native Enzymes are known to cause numerous changes; desirable and/or undesirable, to the chemical and physical attributes of the food system during processing. The second: Application of commercial enzymes in food processing is nowadays a stand of technique for several food products. Inactivation of enzyme activities (native), or enzyme residual activities (commercial enzymes after achieving the desired effect)) during food manufacture is very important to get food product with high and stable quality. In this lecture we will treat only the native enzyme activities. A continuation of enzyme action may cause, for instance, a change in the color of the chlorophyll, or of the carotenoides, or cause browning of various foods. It may also cause change in the taste of carbohydrates, or cause rancidity in oils; it may cause changes in the flavor or in the nutritive value of proteins or vitamins. The presence of pectolytic activity may cause drastic changes in the texture and/or cloud stability of fruit juices. Some enzymes become regenerated after some time of cold storage. This depends on the depth of thermal inactivation and storage time and conditions. Man have to be sure that the technologically important native enzymes have been totally inactivated during Food processing to avoid their negative effect on the quality of the end product. For this raison it is very important to apply proper, simple and acurate methodes to extract and/or detect traces of rest enzyme activities in plant foods, during processing and Storage, in short time.
Key words:Endogenous Enzymes, Enzyme activities detection Methods, Food Quality, Plant Foods, Native Enzymes
[RAM 2016]
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Analytic properties of generalized class of complex Hermite polynomials Allal Ghanmi E.D.P. and Spectral Geometry, Laboratory of Analysis and Applications-URAC/03, Department of Mathematics, P.O. Box 1014, Faculty of Sciences, Mohammed V University in Rabat, Morocco
[email protected]
Abstract: We discuss some basic analytic properties of a class of complex Hermite polynomials and we present some applications of the obtained results.
Key words:Complex Hermite polynomials, Generating functions, Poisson kernel, Heat kernel.
[RAM 2016]
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Novel heterocyclic carboxamide derivatives as potential antihyperlipidaemic Agents: On Plasma Lipid Profile of Triton-WR-1339-Induced Wistar Rats. Yusuf M. Al-Hiari*, Rania Al-QiremTariq M. Al-Qirim**, Manal Al-Najdawi*, RanaAbuFarha* * Department of Pharmaceutical Sciences, Faculty of Pharmacy, The University of Jordan, Amman-11942, Jordan. E-mail:
[email protected] **Department of Pharmacy, Faculty of Pharmacy, Al-ZaytoonahUniversity of Jordan, Amman 11733 Jordan
Abstract: More than 5 heterocyclic systems were revealed with potential hypolipidemic activity by our group such as indole (I), pyrrole, furan, benzofuran and pyridine (II). All derivatives prepared holds carboxamide attached to highly lipophilic substituents such as benzophenones and antharaquinones. This presentation aims to prepare new 5-substituted indole-1H-indole-2-carboxamide derivatives I as a model and to investigate their hypolipidemic activity in-vivo using Triton WR-1339-induced hyperlipidemic rats as animal model. The novel compounds involve 5-Fluoro-1H-indole-2-carboxamide derivatives of benzophenones1 (series A; 5, 6, 12-15), anthraquinones2 (series B; 17, 19), anilines (series C; 21, 25) and acetophenones (series D; 26-27). The new derivatives represented by compounds 5, 6, 17m and 19 have shown a significant reduction in triglyceride levels (69-90%) compared to hyperlipidemic rats. The analogous 5-Chloro , 5Bromo and 5-methoxy-1H-indole-2-carboxamide derivatives did not change the pattern of activity with all active derivatives3. The elevated plasma triglyceride levels produced by Triton WR-1339 administration were significantly (p < 0.0001) suppressed in bezafibrate (79%), in compound (5) (90%), in compound (6) (83%), in compound (17m) (69%) and (79%) in compound (19) after 12 h in comparison to hyperlipidemic control (HG). At the same time, high-density-lipoprotein cholesterol levels were significantly increased after 12 h of Triton administration (+ 86% p < 0.0001) in compound (5), (+ 53% and +27% p<0.01) in compound (6), BF and (+ 16% and + 37% p<0.05) in compound (17m) and (19) respectively compared to hyperlipidemic control (HG). Similar wise, compounds of group II have showed even stronger hypolipidemic activity3,4. R/X
O
O
O R
N H
HN
O R
HN
N
I
II
Key words:Indole-2-carboxamides, hypolipidemicactivity, Triton WR-1339. 123-
4-
Synthesis and Anti-hyperlipidemic Evaluation of N-(benzoylphenyl)-5-fluoro-1H-indole-2-carboxamide Derivatives in Triton WR-1339 Induced Hyperlipidemic Rats, Molecules, 15, 5840-5849, 2010. The Pharmacological Effects of Novel 5-fluoro-N-(9,10-dihydro-9,10-dioxoanthracen-8-yl)-1H-indole-2-carboxamide Derivatives on Plasma Lipid Profile of Triton-WR-1339-Induced Wistar Rats, JEIMC,2013. Synthesis and Preliminary Biological Evaluation of New Heterocyclic Carboxamide Models, LLDD, 12, 417-429, 2015. The Pharmacological Effects of nicotonica cid-2-carboxamide Derivatives on Plasma Lipid Profile of Triton-WR-1339-Induced Wistar Rats, JEIMC,2016.
[RAM 2016]
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Oxidative stress induced by 17β-estradiol exposure in the Invertebrate Species Eisenia fetida Dalel Belhaj*,1, Khaled Athmouni1, Abdelfattah El Feki1, Monem Kallel2, John Zhou3, Habib Ayadi1 1,*
University of Sfax-Tunisia, FSS, Departement of Life Sciences, Laboratory of Biodiversity and Aquatic Ecosystems, Ecology and Planktonology, Street Soukra Km 3.5, BP 1171 CP 3000 Sfax, Tunisia
[email protected];
[email protected];
[email protected];
[email protected] 2
University of Sfax-Tunisia, ENIS. Laboratory of Water-Energy-Environment. Street Soukra Km 3.5. BP 1173 CP 3038Sfax, Tunisia
[email protected]
3
University of Technology Sydney, School of Civil and Environmental Engineering, Centre of Technology in Water and Wastewater, Broadway, NSW 2007, Australia
[email protected]
Abstract: The environmental impacts of various substances on all levels of organisms are under investigation. Among these substances, endocrine-disrupting compounds (EDCs) present a threat, although the environmental significance of these compounds remains largely unknown. To shed some light on this field, we assessed the effects of various concentrations of 17β-estradiol (0, 30, 50, 80 and 100 μg kg-1 soil) to Eisenia fetida after 1, 3, 5 and 8 weeks, respectively. Effect of 17βestradiol (E2) on growth and reproduction, reactive oxygen species (ROS) generation expressed as hydrogen peroxide (H2O2), antioxidant enzymes activity [superoxide dismutase (SOD) and glutathione peroxidase (GPx)] and malondialdehyde (MDA) content of the E. fetida was investigated. The results demonstrated that the highest applied concentrations of E2 (100 μg kg-1) induced 15% E. fetida mortality after 4 weeks. Notably, lower E2 doses (10, 30 and 50 μg kg-1) stimulated reproduction (expressed as the negative inhibition of reproduction at -10.9; -16.8 and -25%, respectively). However, higher concentrations (80 and 100 μg kg-1) significantly inhibited reproduction (29.1 and 53.7%), with an EC50 of 89.5 μg kg-1 for E2. A strong impact on ROS and MDA levels, leading to antioxidant responses in E. fetida, were observed. The SOD and GPx activity were significantly induced at most exposure intervals. The present study illustrates that even though most invertebrates do not possess estrogen receptors, these organisms can be affected by estrogen hormones, probably reflecting free diffusion into the cellular microenvironment with subsequent degradation to molecules that undergo redox cycling, producing ROS, thereby increasing environmental contamination that also hazardously affects keystone animals, forming lower trophic levels. Key words:E. fetida, Oxidative stress, 17β-estradiol
[RAM 2016]
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Structure and Dynamics of Complex Coacervates between Lysing enzyme from Trichoderma harzianum and poly allylamine hydrochloride BEY Houda*1, GTARI Wala1, ASCHI Adel1 and OTHMAN Tahar1 *Correspondance auteur:
[email protected]
Abstract: We study the formation and electrostatic complex mechanism between Lysing enzyme from Trichoderma harzianum LYS1 and polyallylamine hydrochloride PAH. The mass ratio of the mixture is adjusted by varying the concentration of the enzyme at constant concentration of polycation. In agreement with recent theories, the dynamic light scattering, turbidity and zeta potential measurements show phase diagram to weak and strong complexation2. In this work, we develop the influence of temperature on the formation of coacervates using small angle light scattering3, which leads to the formation of microcapsules. This work is widely used in many industrial applications in foods, pharmaceuticals, in particular for emulsions and encapsulation4.
Figure 1.(a) Optical micrograph of the dispersion liquid coacervate droplets being formed by the presence of pH. (b) Speckle images obtained by SALS.
Key words:Complex, Electrostatic interaction, Turbidity, Dynamic light scattering, Coacervats, Small Angle Light Scattering.
References: 1. Houda Bey, Wala Gtari, Adel Aschi, Tahar Othman,Structure and Properties of Native and Unfolded Lysing Enzyme from T. Harzianum: Chemical and pH. International Journal of Biological Macromolecules: 92 (2016) 860-866. 2. Othman M., Aschi A., OthmanT,Polyacrylic acids–bovine serum albumin complexation: Structure and dynamics. Materials Science and Engineering: C ,25(2015),316-323. 3.Cipelletti L., Carpineti M.,Giglio M, Two-color cross-correlation in small-angle static light scatterin,Physical Review,53,1997. 4. Matalanis A., Jones O.G., McClements J. Structured biopolymer based delivery systems for encapsulation, protection, and release of lipophilic compounds. Food Hydrocolloids, 25 (8), (2011), 1865-1880.
[RAM 2016]
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[FeFe] Hydrogenase Models Containing Different Length Diselenolato Bridging Moieties Mohammad K. Harb* Department of Pharmacy, Al-Zytoonah University of Jordan, Amman, Jordan.
[email protected]
Abstract: Models of [FeFe]-hydrogenases containing diselenolato ligands with different length bridging moieties will be prepared. Treatment of Fe3(CO)12 with one equivalent of NCSe(CH2)nSeCN in thf at reflux afforded of diiron compound Fe2(μ-Se(CH2)nSe-μ)(CO)6and tetrairon complex[Fe2(μ-Se(CH2)nSe-μ)(CO)6]2 (n = 7, 8, 9) . In order to elucidate the ability of prepared model complexes to catalyze the hydrogen production, the electrochemical properties of these complexes will be investigated. The catalytic activity of these models will be compared with reported model complexes. Key words:Iron / Selenium ligands / Hydrogenase / Bridging moieties / Electrocatalysis.
[RAM 2016]
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Mathematics and Computer Applications PL12 Ihsen Latifa
Yengui
Algorithms for multivariate polynomials and applications
Debbi
Fractional stochastic Burgers Equation type in Hölder space Existence, Uniqueness and approximations-
Saliha
Hichar
Study of a semi linear elliptic problem from a nonlinear integral equation: Applications to a problem of Electrostatic
Raja
Rabhi
Lattice Boltzmann Method For Simulation Of Entropy Generation For An Axisymmetric Mhd Flow Under Thermal Non-Equilibrium In Porous Micro Duct
Laiadi
Abdelkader
Free surface flow over a multiple obstacles
Lotfi
Boudjenah
Optimal Control Of Non Linear Systems With Delay
Daoud
Houcem
Pseudospectra Of Linear Relations
Abbes
Rabhi
Recursive Estimation Of Conditional Risk Function
Safa
Bhar Layeb
Solving A Tree Network Design Problem To Optimality
Rabi
Rabi
A Theoretical Investigation Of Spatial Distribution Of Radon In A Typical Ventilated Room
Ben Nasser Bacem
On uniform exponential stabilizability of some nonlinear dynamics on non uniform time domains
Slim
Chelly
Some Perturbation Results Of Relatively Weakly Demicompact Operators
Djemoui
Lalmi
Predictions of Isothermal Fuel-Air Mixing in a Dual-Swirl Gasturbine Combustor
[RAM 2016]
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Algorithms for multivariate polynomials and applications Ihsen Yengui Department of Mathematics, Faculty of Sciences of Sfax, University of Sfax, 3000 Sfax, Tunisia
[email protected]
Abstract: I will present an efficient algorithm for completing unimodular matrices over mutivariate Laurent polynomials with complex coefficients. Contrary to the existing algorithms, this algorithm does not convert the given Laurent polynomial vector to a ``regular" polynomial vector, it eliminates all the variables at one time (contrary to the polynomial case), and does not use maximal ideals nor Noetherianity. Note that in concrete applications in systems theory (e.g., in signal processing and control theory), most of the arising polynomial matrices are actually multivariate Laurent polynomial matrices (partly due to the time-delay).
For example, various signal
processing problems can be understood in terms of multi-input multi-output MIMO systems which are characterized by their transfer matrices whose entries are mutivariate polynomials. I will also cast light on the dynamical methods for computing Gröbner bases over rings with zerodivisors and show some applications. Key words: MIMO systems, Completion of unimodular marices, Laurent polynomials, Gröbner bases.
[RAM 2016]
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Fractional stochastic Burgers Equation type in Hölderspace-Existence, Uniqueness and approximationsLatifa Debbi* and Zineb Arab** *Institute of Electrical and Electronic Engineering (Former INELEC)\& Department of Mathematics, Faculty of Sciences, University M'hamedBougara, Avenue of the Independence 35000, Boumerdes, Algeria. *
[email protected] **Department of Mathematics, Faculty of sciences, University El-HadjLakhdher, Batna 05000,Algeria.\& Laboratory of Pure and Applied Mathematics, Faculty of Sciences, University Ferhat Abbas, El-MaaboudaSetif 19000,Algeria.
[email protected]
Abstract: In this work, we use the spectral Galerkin method to prove the existence and to obtain the regularity and the approximation of the solutions of a class of fractional stochatic equations of Burgers type in Hölderspaces. We also make precise the rate of convergence and we prove the path wise uniqueness of the solutions.
Key words:Galerkin approximation, fractional stochastic Burgers type equation, Holder space, and fractional Laplacian.
[RAM 2016]
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Study of a semi linear elliptic problem from a nonlinear integral equation: Applications to a problem of Electrostatic Saliha Hichar
[email protected]
Abstract: In this work we present the results of existence of solutions of nonlinear integralequations for Fredholm on half open intervals, after it was replaced by an ellipticequation with boundary conditions, we was solved by two methods,finally we have numerical results with the variational iteration method .
Key words:Integral equation of Fredholm, semi linear Elliptic Equation, variationaliteration method.
[RAM 2016]
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Lattice Boltzmann Method for simulation of Entropy generation for an axisymmetric MHD flow under thermal non-equilibrium in porous micro duct Raja Rabhi*, Bayssain Amami, Hacen Dhahri and Abdallah Mhimid National School of Engineers, Laboratory of Thermal and Energy Systems Studies Monastir University, Ibn Eljazzar Street, 5019 Monastir, Tunisia (* Corresponding author:
[email protected])
Abstract: Magnetic particles are widely used in a wide range of applications including data storage materials, pharmaceutical industries as magnetic separation tools, anti-cancer drug carriers and micro valve applications. The purpose of the current study is to investigate the irreversibility within a porousmicro duct subjected to an external oriented magnetic field.The Local Thermal Non Equilibrium (LTNE) is adoptedincluding viscous dissipation effects into the energy equation of fluid phase. The governing equations are solved via the modified Lattice Boltzmann Method. Efforts are focused on identifying the influence of magnetic field on theentropy generation with a change of various parameters such as Knudsen, Eckert and Biot numbers. The obtained results show thatthe irreversibility and the contribution of heat transfer irreversibility and fluid flowirreversibility are strongly affected by the presence of magnetic field.
Key words:Micro duct, Magnetic field, LTNE, Modified Lattice Boltzmann method,Viscous dissipation.
[RAM 2016]
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Free surface flow over a multiple obstacles Laiadi Abdelkader*, Merzougui Abdelkrim** *
Department of Mathematics,Biskra University Algeria
[email protected]
**
Department of Mathematics, M’SILA University Algeria
[email protected]
Abstract: Steady two-dimensional flows over a multible obstacles under the effects of gravity and surface tension in water of a constant depth, and in the presence of a uniform stream. The fluid is treated as inviscid and incompressible. The flow is assumed irrotational. The problem is solved numerically by using the boundary integral equation technique, based on Cauchy integral formula . It is shown that, for both supercritical and subcritical flows, solutions depend on three parameters: (i) the Froude number F, (ii) the Weber number (iii) the angles of obstacles . Finally, solution diagrams for all ow regimes are presented. Key words:Free surface flow, potential flow, Weber number, surface tension, Froude number.
[RAM 2016]
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Optimal control of nonlinear systems with delay Lotfi Boudjenah Department of Information and Communication Sciences, University of Oran1, BP 1524, Oran, 31000, Algeria.
[email protected]
Abstract: In the time-delay systems (called also hereditary or systems with aftereffects) theevolution of current states depends on the past values of states and/or controls.Their evolution is described by differential equations, which include informationon the past history, i.e. the present state of a timedelay system is determinedin some way by its past history. The reaction of real world systems to exogenoussignals is never instantaneously and it needs some delay. In general, a time-delaysystem arises as a result of inherent delays in the transmission of information between different parts of the system and/or as a deliberate introduction oftime delay into the system for control purposes. The delay effects on controlof dynamical systems (delays in the state and/or in the input) are problems ofrecurring interest since the delay presence may induce complex behaviors (oscillations, instability, bad performances). In this work we study the optimal control problem for nonlinear time-delaysystems via paratingent equation with delayed argument. We use an equivalenttheorem between solutions of differential inclusions with time-delay and solutions of paratingent equations with delayed argument. To show the existence ofoptimal control, we use the main topological properties of the set solutions ofparatingent equation with delayed argument.
Key words:Delayed argument, differential inclusion, minimization, optimal control, paratingent, set-valued, time-delay system, upper semicontinuous.
[RAM 2016]
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Pseudospectra of linear relations Daoud Houcem
[email protected]
Abstract: In this paper, we introduce and study the pseudospectra and the essential pseudospectra of linear relations. We start by giving the definition and we investigate the characterisation and some properties of these pseudospectra.
Key words:Linear relation, pseudospectra, essential pseudospectra,Fredholm and semi-Fredholm relation.
[RAM 2016]
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Recursive Estimation Of Conditional Risk Function Abbes Rabhi 1*, Amina Angelika Bouchentouf2** and Aboubacar Traoré 3*
[email protected] [email protected] [email protected]
Abstract: In this work, we introducea new nonparametric estimator of the conditionalhazard function, to this end a nonparametric estimators of the conditionalcumulative distribution and a conditional density function of a scalar response variable Y given a functional randomvariable X are determined. We estimate non-parametricallythe conditional cumulative distribution and
the
conditional densityfunction. After that we estimate the conditional hazard function. Our estimates are based onrecursive approach. We prove under generalconditions, the Almost sure convergence and thequadratic average convergence of the constructed estimates. Key words:Conditional density, conditional cumulative distribution,recursive estimation, functional random variable, kernel estimator, semi-metric space.
[RAM 2016]
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Solving a Tree Network Design Problem to Optimality Safa Bhar Layeb Université de Tunis El Manar, Ecole Nationale d’Ingénieurs de Tunis UROASIS : Optimisation et Analyse des Systèmes Industriels et de Services BP 37 Le Belvédère, 1002, Tunis, Tunisie
[email protected]
Abstract: The exponentially rapid development of the Information and Communication Technology sector during the last decades has prompted the emergence of several new challenging optimization problems, many of which are modeled as variants of the well-known Steiner tree problem. In this work, we investigate a Generalized version of the Prize Collecting Steiner Tree Problem (GPCSTP) on a graph. Given a nodes set partitioned into clusters, edge costs,nodes prizes and penalties, as well as a preset quota for each cluster, the GPCSTP seeks to find a tree thatcollects a total prize not smaller than each specified cluster’s quota, whileminimizing the sum of the total edge costs of the tree plus the penalties associated with the nodes that are not included in the tree. In telecommunication settings, the GPCSTP may arise while designing a fiber-optic backhaul network for a fixed wireless system. More precisely, the nodes represent the possible antenna sites, which are divided geographically into clusters. For each potential site, a revenue (prize) is estimated to be obtained from the customers who are reachable from this antenna site, as well as an opportunity cost (penalty) for not placing an antenna at this location. The cost of laying a fiber-optic cable between any pair of locations corresponds to an edge cost. For the profitable business of network operators, the problem is to design a minimum cost tree network that connects a selected subset of locations in each cluster such that the total corresponding collected revenue is not less than a preset goal. Not surprisely, this challenging network design problem is an NP-Hardcombinatorial optimization problem. The scope of this work is to propose a new formulation for the GPCSTP in order to tailor an exact Benders decomposition based approach.The proposed procedure is implemented using C# language in concert with the MIP solver CPLEX.In order to evaluate its computational performance, tests are carried on several instances. Optimal solutions are found in very reasonable times. Key words:Benders’s decomposition, Column Generation Algorithm, Network Design Problem, Prize Collecting Steiner Tree Problem.
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A theoretical investigation of spatial distribution of radon in a typical ventilated room R. RABI, L. OUFNI * Sultan Moulay Sliman University, Faculty of Sciences and Techniques, Department of Physics (LPM), B.P.523, 23000 Beni-Mellal, Morocco. E-mail address:
[email protected] ,
[email protected] (L. Oufni)
Abstract: Inhalation of radon (222Rn) and its daughter product are a major source of natural radiation exposure. It is known from recent surveys in many countries that radon and its progeny contribute significantly to total inhalation dose and it is fairly established that radon when inhaled in large quantity causes lung disorder. In recent times, Numerical modelling has become the cost effective replacement of experimental methods for the prediction and visualization of indoor pollutant distribution [1]. In this study, we developed a model based on the Finite Volume Method (FVM) implemented in FORTRAN software using SIMPLER algorithm to simulate the behavior of spatial and temporal distributions of (222Rn) and their progeny in the room air, as well as, to calculate their spatial distributions. This paper focuses on effects of exhalation from different sources (wall, floor and ceiling) and the ventilation profile on distribution the concentrations of radon and their progeny indoor. The radon exhalation rate from walls, floor and ceiling, and ventilation rate were measured as a part of this study and are used as input in FVM simulation. It has been found in this study, that the radon concentration and their progeny are distributed in non homogeneous way in the room this is due to the difference in the radon concentration from different sources (wall, floor and ceiling). Moreover, a higher concentration was observed near floor of the room, and decreases in the middle of the room this is due to the effect of air velocity [2]. As well as, have been found the distributions of unattached and attached fraction of 218Po, 214Pb and 214Po radionuclides are similar to that of 222 Rn. In addition, equilibrium fraction F and the unattached fraction ( fj ) of 218Po, 214Pb and 214Po radionuclides for different values of the attachment rate were evaluated. The experimental validation was performed by measuring radon concentration at different locations in room using active (Radon Scout Plus) technique [3]. We notice that the simulation results of radon concentration are in agreement with the results of studies experimental. The committed equivalent doses due to 218Po and 214Po radon short-lived progeny were evaluated in different tissues of the respiratory tract of workers from the inhalation of indoor air. Key words:Radon, Simulation, Finite Volume Method, Ventilated room, Reynolds number, Radon effective dose. [1] UNSCEAR. United Nations Scientific Committee on the Effect of Atomic Radiation., Report to the General Assembly. United Nation, New York (2008). [2] V. Urosevic, D. Nikezic, and S. Vulovic,. J. Environ. Radioact.,99(12), (2008) p. 1829 [3] C. G. SUMESH, A. VINOD KUMAR, R. M. TRIPATHI, AND V. D. PURANIK,. RADIAT PROT DOSIMETRY., 153(3), (2013) P. 309
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On uniform exponential stabilizability of somenonlinear dynamics on non uniform time domains Bacem Ben Nasser Department of Mathematics, Faculty of Sciences, University of Sfax-Tunisia. E-mail :
[email protected]
Abstract. In this talk we discuss the linear stabilization problem of some nonlinear dynamics on time scales. Some sufficient conditions are derived to design a state feedback controller fora class of nonlinear systems under vanishing perturbations on non uniform time domains. Usingsome Gronwall’s integral inequalities, the uniform exponential stabilizability, is guaranteed. Furthermore, based on the Lyapunov theory, new sufficient assumptions are proposed to derivethe controller ensuring the practical stabilizability for a class of time-invariant nonlinear systemsunder non-vanishing perturbations. Some numerical examples are given to support the theoreticalwork.
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Some Perturbations results of Weakly Relatively Demicompact Opertaors Slim chelly Abstract In this presentation, we introduce the concept of weakly demicompactnesswith respect to a weakly closed densely defined linear operator, as a generalization of theclass of demicompact operator introduced by Petryshyn (1966) and the class of relativelydemicompactness introduced by Krichen Bilel (2014) and we establish some new results inFredholm theory. Moreover, we apply the obtained results to discuss some perturbationresults of weakly relatively demicompact opertaors.
Key words Weakly demicompact linear operator; Weakly closed operator; Fredholmand semiFredholm operators; measure of noncompactness
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ABSTRACTS Poster session
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Biotechnology 1
Amel
Touilsag
Algeria
Conformational Study Of Β-D-Neocarrabiose In Explicit Solvant
2
Chafika
Zidani
Algeria
Design And Investigation Of A Conical Solar Furnace Powered By Optical Fibers
3
Fatma
Kobibi
Algeria
Etude Des Transfert De Charges Dans Les Molécules Conjuguées Par Les Méthodes De Chimie Quantiques
4
Sabrina
Boualem
5
Nour El
Bensiradj Algeria
Algeria
Houda
6
Naouel
Hyperpolarizabilities Of Phenyl Amine Derivatives Theoretical And Spectroscopic Study Of Zn(Ii) And Cd(Ii) Complexs Of Type[ M(Te Ph)2 ][Tmeda ]By Dft And Tddft
Bouregba Algeria
Wastewater Treatment System By O3 (Wwtp Of Mascara West Of Algeria)
7
Radhia
Fourati
Tunisia
Characterization of fluoride and lead accumulation in polluted soil in an industrial zone in Sfax city during two critical periods.
8
Soufiane
Bentout
Algeria
Global Analysis Of Infection And Latency Ages Model With Non Linear Incidence Rates
9
Ibtissem
Missaoui
Tunisia
How Corruption Affects The Soundness Of Islamic Banks?
10
Natalia
Kulikova
Russian
Classical Languages In Medical And Legal Terminological
Federation
Systems
Germany
Computational
11
Jihene
Jerbi
study
of
the
cytosine
derivatives
during
demethylation process
12
Ahmed
DEBEZ
Tunisia
Genetic variation for response to salt stress in parental genotypes of Medicago truncatula recombinant inbred lines
13
Dalal
HARKATI Algeria
A theoretical investigation of reactivity and regioselectivity of Hydantoin and derivatives
14
Nadjib
FERHAT
Algeria
At the origin of the Maghreb populating
15
Mohamed
El-Deab
Egypt
Electrocatalysis by nanoparticles: Enhanced oxidation of formic acid
at
binary
metal/metal
oxide
nanoparticles-modified
electrodes
[RAM 2016]
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Genetic variation for response to salt stress in parental genotypes of Medicago truncatula recombinant inbred lines Ahmed Debez*, Amina Ayadi*, Chedly Abdelly*, Mounawer Badri* *
Laboratory of Extremophile Plants, Centre of Biotechnology of Borj Cedria, B.P. 901, Hammam-Lif 2050, Tunisia Email:
[email protected],
[email protected] [email protected],
[email protected]
Abstract: Salt stress is one of the main factors limiting the productivity of legumes in the Mediterranean area. Medicago truncatula has been chosen as a model legume because of its several advantages. This study aims to analyze the genetic variation in ten parental genotypesofM. Truncatularecombinant inbred lines collected from different eco-geographical regions through the world. The ten lines of M. truncatulawere cultivated incontrol treatment (0mM NaCl), 75 mM, and 100 mM NaClunder greenhouse conditions. The analysis of response to saltstress was performed in studied lines using 25 morph-physiological traits.Results from ANOVA showed that the variation of measured traits was explained by the effects of line, treatment and their interaction. The salt response index (SRI) values revealed that F83005.5 line was the most sensitive whereas TN6.18 and TN8.3 were the most tolerant. The high broad sense heritability (H2) levels registered for flowering time, aerial dry weight, aerial water content, relative water content, weight of 100 pods suggest their utility as selection criteria for the variation of salt tolerance. Hierarchical classification of studied lines based on SRI values revealed that lines were clustered into two classes according to their response to salinity. On the other hand, results from ANOVA showed that the variation of photosynthetic parameters was explained by the effects of line, treatment and their interaction. Taking into account the SRI of photosynthetic parameters, F83005.5 was the most sensitive while TN6.18 was the most tolerant. Our results allow identifying the most appropriate segregating populations of recombinant lines that will be used to identify the QTLs for tolerance to salinity.
Keywords:
Medicago
truncatula,
morphological
traits,
parental
lines,
photosynthetic
parameters,salinity.
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Conformational study of β-D-neocarrabiose in explicit solvant Amel DERIET AMAR TOUILSAG, N. BESTAOUI and M. SEKKAL-RAHAL Laboratoire de Microscopie, Micro-analyse de la Matière et Spectrsocopie Moléculaire L2MSM, Faculté des Sciences Exactes. Université Djillali Liabes de Sidi Bel Abbès,B.P.89, Sidi Bel Abbès, 22000, ALGERIA
[email protected] [email protected] [email protected]
Abstract: Carragenans are linear sulfated polysaccharides occurring as cell wall constituents in red algae and are used as texturing agents in the food industry. Their skeleton is composed of D galactopyranose connected by links alternately α (1 → 3) and β (1 → 4) galactopyranose. The objective of our study is mainly to explore the conformational space and identify conformations corresponding to the lowest energies taking into account the geometrical parameters, the dihedral angles of the glycosidic bond. To achieve this goal, DFT methods were used in order to study the structures of β-D-neocarrabiose with the presence of an explicit solvent (with two and three molecules of water). For this aim, we first included the counterpoise BSSE correction. For this purpose we adopted two steps: the construction of adiabatic maps using the B3LYP/6-31G(d) level followed by a complete relaxation of the lowest energy conformations ,using the levels of theory B3LYP with several basis set also B3PW91;M06-2X with 6-31G(d).The principal results showed the Important effect of the augmentation the molecules of water in the system on the stabilityof carragenans.
Key words:β-D- neocarrabiose, DFT methods, B3LYP, explicit solvent, adiabatique maps.
[RAM 2016]
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Hyperpolarizabilities of phenyl amine derivatives S. S. BOUALEM, M. SEKKAL-RAHAL, F. DJILANI-KOBIBI Laboratoire de Microscopie, Micro-analyse de la Matière et Spectrsocopie Moléculaire L2MSM, Faculté des Sciences Exactes. Université Djillali Liabes de Sidi Bel Abbès,B.P.89, Sidi Bel Abbès, 22000, ALGERIA
[email protected] [email protected] [email protected]
Abstract: A theoretical study of some organic molecules of push-pull type for NLO applications is reported in this work. Ab initio calculations on chromphores D-phenyl-N=C-A to ensure optimization geometries with B3LYP functional with a base 6-31 g (d, p) were first performed. For this aim, functional hybrid M06-HF-PBE was used to obtain the preferable positions for substitutions that give highest NLO parameters. Mulliken charges and NBO are analyzed and HOMO and LUMO orbitals responsible for excitability of molecules were also determined. Key words:NLO , DFT, Push-Pull , hyberpolarisability.
[RAM 2016]
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Wastewater treatment system by O3(WWTP of Mascara west of Algeria) BOUREGBA Naouel 1*, BENMIMOUN Youcef 2** and TILMATINE Amar 3*
[email protected] [email protected] [email protected]
Abstract: Biological treatments are often used in the wastewatertreatment plants in Algeria. In such processes,the pollutants are biodegraded or mineralized by themicroorganisms. On the one hand, these treatmentsare inexpensive and reliable methods for eliminatingpollutants from wastewater, but there are substanceswith which they are unable to deal. On the otherhand, oxidation processes have shown utility for toxiccompound elimination and became a viable treatmentoption for wastewaters. Numerous techniques cancomplement or substitute biological processes toaccomplish a technically efficient treatment. Becauseof this, the oxidation by electrical methods which reststhis work is one of the most possible alternatives.
The objective of this workis to use theozone produced by dielectric barrier discharges(DBD)for wastewater treatment, which is considered to be a newtechnology in Algeria, using a new generator DBD ofhigh voltage (ozone generator), accomplished in ourresearch laboratory.The ozonated water are subjected to the analysis of differentparameters of wastewater characterization
Key words:wastewater, WWTP of Mascara, oxidation, ozone, DBD generator
[RAM 2016]
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Design And Investigation Of A Conical Solar Furnace Powered By Optical Fibers C.Zidani*, Y. Menni* and B. Benyoucef*
[email protected] [email protected] [email protected]
Abstract: A novel solar furnace used in photothermal system has been designed. This study dealt with the thermal study and performance assessment of the system based on the idea of transmission concentrated solar energy via optical fibres (TCSEvOF). The design can be used in the biotechnology and the biochemistry fields. The aim of this work is the study and modelling of a new design of photothermaldevice with reduced losses and high efficiency. We optimize the coupling of a paraboloidal dish, which concentrates direct solar irradiance with dual axes tracking component, and the optical fibre, which transmits concentrated solar energy; this study is aimed for the site of Tlemcen in Algeria. We present the daily power obtained at the output of the optical fibre, The power supply is estimated to be 39 W at the end of a 4 m long optical fibre. We show that the energy transported is diffused until the top of the cone then disperse inside them. The energy is absorbed by the inner surface of the cone, which is made by a selective surface. Temperatures of the solar furnace higher than 1000°C may be reached higher then maintaining very good efficiency. Key words:solar lighting, concentrated solar energy, optical fibre, solar furnace.
[RAM 2016]
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A theoretical investigation of reactivity and regioselectivity of Hydantoin and derivatives Dalal HARKATI*, Manel FELLOUSSI and Salah BELAIDI *
Faculty of Sciences, LMCE Laboratory, Department of Chemistry, Group of Computational and Pharmaceutical Chemistry, University of Biskra, 07000, Biskra, Algeria
[email protected] [email protected]
Abstract: Numerous families of five membered heterocycles have proven to be valuable in medicinal chemistry. Cyclic Hydantoin and derivatives represent an important class of compounds in medicinal chemistry due to its large spectrum of biological activities. The reactivity behavior of Hydantoïn, Oxazolidinedione and Thiazolidinedione toward an electrophilic attack has been the subject of different theoreticalinvestigations. Density functional theory (DFT) provides a powerful theoretical framework for the study of both reactivity and selectivity. From the DFT equations, many concepts widely used byexperimental chemists have found both mathematical basis andphysical meaning. In this work to aim to predict chemical reactivity and regioselectivity of heterocyclic compounds with five-membered ring of Hydantoin, oxazolidinedione and Thiazolidinedione in electrophilic substitution reactions. The geometric study was conducted for the purpose of selecting the base and a study of the reactivity to calculate global and local nucleophilicity, these calculations were performed with the Gaussian 09 program using the method DFT / B3LYP-6 311G ++ (d,p). The calculated results have been reported in the present work.
Key words:Reactivity, Conceptual DFT, Molecular modeling, Hydantoïn, Oxazolidinedione, Thiazolidinedione.
[RAM 2016]
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Charges transfer QM study in conjugated organic molecules F. F. Djilani-kobibi*, M. Sekkal-Rahal Laboratoire de Microscopie, Micro-analyse de la Matière et Spectrsocopie Moléculaire L2MSM, Faculté des Sciences Exactes. Université Djillali Liabes de Sidi Bel Abbès,B.P.89, Sidi Bel Abbès, 22000, ALGERIA E-mail:
[email protected]
Abstract: Pentacene (PEN) (Fig. 1) is one of the most widely used organic semiconductors due to its physical,chemical and morphological properties .Outstanding properties of PEN and its derivaties are their exceptionally high charge mobilities making them particularly intersting for property and the posibility to grow highly oriented thin films allowed for strong improvements in device performance. There have been numerous reports on basic properties as well as on applications of films in devices. All calculations have been performed using Gaussian 09 software. Structures have been first optimized using B3LYP functional combined with the 6- 31g+(d,p) basis set for the isolated molecules in their ground state. However, properties such as dipole moments, polarizabilities and hyperpolarizabilities have been acheived using the series of M06 functionals; M05 [8], M06 [8,9], M06- 2X [8], and CAMB3LYP.as well as the second order Møller Plesset perturabtion theory MP2 method that is considerred as a reference in this work and to which all our other calculations will be compared.
Fig. 1 Molecules considered with D : OCH3 , A =R: Br, CN, F , Cl,OCH3.
[RAM 2016]
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How corruption affects the soundness of Islamic banks? Missaoui Ibtissem *, Jallelddine ben Rejeb **
[email protected] [email protected]
Abstract: Islamic banking is growing rapidly worldwide and ever more recognized as an alternative mode of financing, especially in recent years while capitalism has shown its restrictions and weaknesses. However, this astronomical growth of banking and Islamic finance has been associated with a high level of corruption in many Muslim countries. This disease of corruption can prevent Islamic banking as an effective and significantly better path for poverty reduction and economic development. The intention of this article is to study the impact of corruption on the soundness of Islamic banks (ISB).Using a panel of 80 introducing brokers during the period 2007-2010, we give strong evidence that the level of corruption aggravates the problem of dubious funding.
Key words: Islamic banking; Corruption; Dynamic panel data, Islamic finance, economic development
[RAM 2016]
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Computational study of the cytosine derivatives during demethylation process Jihène Jerbi*, Michael Springborg* *
A Physical and theoretical chemistry, Saarland University
[email protected] [email protected]
Abstract: Cytosine methylationisawellknown DNA modification that has an extreme influence on the genomestability. However, the removal of the methyl group isstill ahardlyunderstood andcomplicatedprocess. Therefore, the aim of this study is to provide a computational insight into the reactivity properties of modified Cytosine in the gas-phase and during the demethylationprocess. Sincethisfieldisrelativelyincipient, our goal is to find the relationshipbetween the reactivity, stability and
lifetime
of
the
moleculesduring
the
demethylationprocess
in
orderto
understandtheirbiologicalfunction. The presence of methyl, hydroxymethyl, formyl and carboxygroups in the modified Cytosineis shown to affect the geometry of Cytosine-Guanine pairs especially when they are ionized. This is demonstrated through results of dispersion-corrected density functional calculations that show that the hydroxymethylCytosine-Guanine is found to be the most stable molecule among all the modified cytosine-Guanine pairs. Key words:Dispersion-correction, DFT calculations, DNA demethylation, Reactivity
[RAM 2016]
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At the origin of the Maghreb population Pr. Dr. Nadjib FERHAT C.N.R.P.A.H. – Algiers – ALGERIA
[email protected]
Abstract: The age of our ancestors goes back to the dawn of the humanity.They are buried in the earth on which we live. The ground and the sub ground of our Maghreb country retain the legacies of peoples who have inhabited these lands from the most ancient times of prehistory epoch. The oldest remains go back to two million years. Since these times back away, this area, the Maghreb, who is an African and a Mediterranean part of the world, was never emptied but has undergone during its history of various attempts on the part of peoples coming from distant lands, wanting to settle down , carrying the hope of finding shelter and prosperity. They are all outdated time, adapting to the vagaries of the climate from the Atlantic to the Red Sea and the Mediterranean Sea to the Saharo-Sahelian confines. Their presence in this space has not always been facilitated because its scope covering latitudes and very large longitudes by often extreme climates between cold and intense aridity. Often, in the varied places of the Maghreb region, we usually meet, in nowadays, traces, artifacts and remains of these ancestors. Each time, we perceive, the ingenuity and the capacity of this North African man to find ways of adaptation and acclimatization to these insensitive environments, making miracles by inventing and transforming materials derived from his direct environment to make diverse and varied objects and tools in order to meet his daily needs and exceed all the risks and hazards to which they were face. They have always managed to find the workarounds necessary to their survival Key words:Ancestors,Humanity,Legacies, Maghreb, prehistory epoch.
[RAM 2016]
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Classical languages in medical and legal terminological systems Natalia A. Kulikova Department of Translation and Theory of Translation,pr. Baidukova / ul. Gagarina, 1a/11, 440039, Penza, Russia, Email:
[email protected]
Abstract: The quantity of scientific terms grows constantly. A huge volume of the scientific vocabulary is an objective reality, since any science does not exist without its terminological base. The well-known fact is that the terminologies of the most different sciences, including sciences recently appeared, replenished and continue to replenish at the expense of active attraction, of the vocabulary and word-formation means of two classic languages of the Antiquity - Ancient Greek and Latin. Ancient Greek language and Latin language belong to the family of Indo-European languages. The terminology of a Greek-Latin origin easily assimilates in all these languages quite often through intermediate languages. A modern scientific terminology, proceeding from a language origin of words, forms of writing, function which is carrying out at national or international level, is divided into following basic groups: 1) primordial national names; 2) adoptions (loanwords) or artificial made (designed) classicisms (Greek and Latin loanwords); 3) primordial West European terms; 4) so-called Latin “termini technici” - the special terms used and unequivocally understood only by experts of corresponding areas of scientific knowledge. Keywords: Ancient Greek, family of languages, language,Latin, term, terminology
[RAM 2016]
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Theoretical and spectroscopic study of Zn(II) and Cd(II) complexs of type[ M(Te Ph)2 ][TMEDA ]by DFT and TDDFT N. E .H BENSIRADJ 1**, A. DEKHIRA 2* and O. OUAMERALI 3* Laboratoire de chimie théorique computationnelle et photonique Faculté de chimie, USTHB CP 16111 El Alia, ALGER, ALGERIE Ecole normale supérieur des enseignants Kouba ,ALGER,ALGERIE
[email protected] [email protected] [email protected]
Abstract: In recent years, nonmaterials have drawn enormous interest from scientists because of their special characteristics. The systems containing the zinc tellurium and cadmium tellurium are good candidates for potential applications in biology and medicine, namely for fluorescent marking of the biological molecules in the exploration of the human being. We proceeded to the study of the systems [ M(TePh)2 ][TMEDA ] M=Zn,Cd containing the ligands ZnTe and CdTe which have very promising applications in several domains and particularly in optoelectronics such as its usage in manufacturing lasers, solar cells and the detection of the THZ radiations. [Zn (TePh) 2][TMED] is a complex which is of biological and medicinal interest; it is generally used in the synthesis of the nano crystals like ZnTe. It was the subject of several studies, particularly crystallographic studies. The objective of our work involves the study of the ground state and the excited states for such system and [Cd (TePh) 2][TMED],which has not been previously studied . Density functional theory calculations at M06 and B3LYP method with LANL2DZ basis set are used in order to investigate the ground state structural and energetic properties. For the determination of the excited states and their properties, we have employed the TDDFT (CAM B3LYP) method implemented in the software G09. Key words: DFT, [M (Te Ph) 2][TMEDA], M= Zn , Cd, TDDFT, excited states.
[RAM 2016]
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Characterization of fluoride and lead accumulation in polluted soil in an industrial zone in Sfax city during two critical periods. Fourati, R. *, Ben Ahmed, Ch. **, Zouari, M. **, Mezghani, I *, Ben Rouina, B. **, Ben Abdallah, F. * *Laboratory of Plant Biodiversity and Ecosystem Dynamics in Arid Area, Faculty of Sciences of Sfax,Tunisia **Laboratory of Improvement of the Olive Production and Products Quality, Institute of Olive Tree in Sfax, Tunisia
Abstract: Recently, due to the increased industrial activities in Tunisia, in particular in Sfax, environmental pollution is becoming a serious problem not only for plants and animals, but also for soil preservation and human health. Our study deals with the effects of environmental pollution on soil fluoride and lead patterns over two critical periods among the crop seasons and their relationships with physic-chemical parameters of the soil. Analyses of different physicochemical and mineralogical traits of a polluted soil in comparison with those of a control one have enabled us to record a considerable reduction in both lead and fluorine content in the different soil horizons during the spring (April 2011) season over the summer one (July 2010). In addition, the study of the distribution of concentrations of lead and fluorine at the level of different horizons showed that these concentrations decreased as one moves away from the transmitting source and with the depth. Our data showed also that an acid pH appears to favour an increase in pollutants accumulation at ground level, as well as their mobility. Similarly, organic matter seems to play an important role in the complexation of these pollutants by adsorption on mineral and organic colloids. Furthermore, the results of analyses of the various correlations argue in favour of complexation of fluoride and lead with various organic and inorganic molecules.
Key words:Atmospheric pollution, fluoride, lead, soil characteristics, mineral elements, organic matter.
[RAM 2016]
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Electrocatalysis by nanoparticles: Enhancedoxidation of formicacidatbinary metal/metal oxide nanoparticlesmodified electrodes Mohamed S. El-Deab*, G. M. El-Nagar, A. M. Mohammad and B. E. El-Anadouli *
Department of Chemistry, Faculty of Science, Cairo University, Cairo, Egypt *
[email protected]
Abstract: The current study proposes a novel binary catalyst system (composed of metal/metal oxide nanoparticles) as a promising electrocatalyst in formic acid oxidation. The electro-catalytic oxidation of formic acid is carried out with binary catalysts of Pt nanoparticles (nano-Pt) and nickel oxide nanoparticles (nano-NiOx) electrodeposited onto glassy carbon (GC) electrodes. Cyclic voltammetric (CV) measurements showed that unmodified GC and nano-NiOx/GC electrodes have no catalytic activity. While two oxidation peaks were observed at nano-Pt/GC electrode at ca. 0.2 and 0.55 V (corresponding to the direct oxidation of formic acid and the oxidation of the poisoning CO intermediate, respectively). The combined use of nano-NiOx and nano-Pt results in superb enhancement of the direct oxidation pathway. Nano-NiOx is shown to facilitate the oxidation of CO (to CO2) by providing oxygen at low over-potential. This leads to retrieval of the Pt active sites necessary for the direct oxidation of formic acid. The higher catalytic activity of nano-NiOx/nanoPt/GC electrode (with Pt firstly deposited) compared to its mirror image electrode (i.e., with NiOx firstly deposited, nano-Pt/nano-NiOx/GC) reveals that the order of the electrodeposition is an essential parameter. Key words:Electrocatalysis, Energy conversion, Fuel Cells,Nanoparticles.
[RAM 2016]
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Poster session Mathematics and Computer Applications 1
Meriem
Djenaoui
A Mollification Method For A Cauchy Problem For The Laplace Equation
2
Firouz
Belmechri Equation Integral Dans Les Espaces Fonctionelles
3
Mohamed
Houas
Existence Of Solutions For Fractional Differential Equations Involving Two Fractional Orders
4
Noureddine
Bahri
La Compacité Du Résolvante Pour L'Opérateur De Schrödinger Avec Champ Magnétique
5
Khemisti
Akmoum
Modeling Of Amorphization Kinetics In Sic Under Ion Implantation
6
Salah
Frioui
Simulation Of Multi-Stage-Flash Plant And Development Of A DataProcessing Program
7
Abdessamad Sekkal
Structural And Thermo-Elastic Properties Of The Ercu, Erag, Erau Dycu, Ndag, Lacd And Yin Intermetallics Compounds: Ab-Initio Calculation Analyzed With Data Mining Approach.
8
9
Mountassir
Nizar
10 Aicha
Hamdi
The Homotopy Perturbation Method For Solving Some Differential
Cherif
Equations.
Ben
ROI Selection of Breast cancer Microcalcifications Based Morphologic
Hamad
Operation and Mixture Parametric Distributions
Boussaha A New Modified Scheme For Linear Shallow-Water Equations With Distant Propagation Of Irregular Wave Trains Tsunami Dispersion Type For Inviscid And Weakly Viscous Fluids
11 Dalal
Hachelfi
Trust Region With Conjugate Gradient Algorithms For A Class Of Nonlinear Optimization
12 Nouioua
Tarek
Interest Of Gpus Architecture For Accelerating Iterative Reconstruction Methods
[RAM 2016]
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Structural and Thermo-elastic properties of the ErCu, ErAg, ErAu DyCu, NdAg, LaCd and YIn intermetallics compounds: Ab-initio calculation analyzed with data mining approach. Abdessamad Sekkal* and Fatiha Saidi** *École Préparatoire Sciences et Techniques Alger - E. P. S. T. A Division Etude et Prédiction de Matériaux, Unité de Recherche Matériaux et Energies Renouvelables, Département de Physique, faculté des Sciences, Université Abou Bekr Belkaid B.P 119, 13000 Tlemcen, Algeria
[email protected] **École Préparatoire Sciences et Techniques Oran- E. P. S. T. O Division Etude et Prédiction de Matériaux,Unité de Recherche Matériaux et Energies Renouvelables, Département de Physique, faculté des Sciences, Université Abou Bekr Belkaid B.P 119, 13000 Tlemcen, Algeria
[email protected]
Abstract:
In this work, the full-potential linearized augmented plane wave (FLAPW) method has been employed within the generalized gradient approximation (GGA) to investigate the structural and elastic properties of ErCu, ErAg, ErAu, DyCu, NdAg, LaCd and YIn compounds. The calculated ground state properties such as lattice constants, bulk Modulus and elastic constants agree well with the experiment and theoretical values. The independent elastic constants and their related properties satisfy the requirement of mechanical stability, indicating that our compounds could be stable. The ductility or brittleness of these intermetallic compounds is predicted, the calculated results indicate that NdAg is the most ductile amongst the present compounds. Thermal effects
on some
macroscopic properties of ErCu and ErAu, LaCd, YIn and DyCu are predicted using the quasiharmonic Debye model in which the lattice vibrations are taken into account. The numerical estimation of the thermal properties is performed for these compounds and still await experimental confirmations. Mechanical and thermal properties were discussed, and analyzed with data mining approach. Key words:Intermetallic compounds, ab-initio calculations, elastic properties, Thermal properties, Data mining approach
[RAM 2016]
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A new modified scheme for linear shallow-water equations with distant propagation of irregular wave trains tsunami dispersion type for inviscid and weakly viscous fluids Aicha Boussaha Department of Mathematics, National Superior School of Mines and Metallurgy, Annaba, Algeria.
[email protected]
Abstract: We propose a modified scheme for simulating irregular wave trains propagation dispersive of tsunami with suitable initial and boundary conditions by applying the alternating direction implicit method (ADI). The convergence, stability and consistency criteria of the scheme have been studied. We introduce a weakly dissipative terms [1]into improved linear Boussinesq equations (ILBqs) [2] that permits the mathematical tool to simulating a transoceanic propagation dispersive of tsunami in both ocean and laboratory experimental. The new numerical dispersion of the proposed model is manipulated to replace the physical dispersion of ILBqs by controlling dispersion-correction parameters [3]. The new model developed in this study is applied to propagation of Heraklion tsunami scenario 1 (HTS1) [4] of the 365 AD earthquake. The resulting scheme is efficient and practical to implement. Furthermore, a comparison between the present results with another existing numerical method [5] has been reported and we found that they are in a good agreement. Key words:Improved Linear Boussinesq equations; Numerical dispersion-correction parameter; Dissipation effects; Tsunamis Références: [1] Y. S. Cho, D. H. Sohn and S. O. Lee, Practical modified scheme of linear shallow-water equations dor distant propagation, Ocean Engineering 34 (2007) 1769-1777. [2] D. Dutykh, O. Goubet, Derivation of dissipative Boussinesq equations using theDirichlet-to-Neumann operator approach, Mathematics and Computers in Simulation (2014). [3] E.T., Flouri, N., Kalligeris, G., Alexandrakis, N.A., Kampanis, and C.E., Synolakis, Application of a finite difference computational model to the simulation of earthquake generated tsunamis, Appl. Numer. Math., 67 (2013), pp. 111-125. [4] P. A. Madsen and O. R. Sørensen, A new form of the Boussinesq equations with improved linear dispersion characteristics, Part 2, Coastal Engineering 18 (1992) 183-204.
[RAM 2016]
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La Compacité Du Résolvante Pour L'Opérateur De Schrödinger Avec Champ Magnétique Bahri Noureddin Abstract: The rigorous study of Schrödinger operator, has become a highly developed mathematical discipline during the past 25 years for a systematic review, there has been much has study of Schrödinger operator with magnetic fields. In the present paper we shall consider the Schrödinger operator with magnetic fields. 𝑛𝑛
2
𝐻𝐻𝑉𝑉 (𝑎𝑎) = � �−𝑖𝑖𝜕𝜕𝑥𝑥 𝑗𝑗 − 𝑎𝑎𝑗𝑗 (𝑥𝑥)� + 𝑉𝑉(𝑥𝑥); 𝑖𝑖 = √−1 𝑗𝑗 =1
Where 𝑎𝑎𝑗𝑗 and 𝑉𝑉 are the operators of multiplication by real-valued function onℝ𝑛𝑛 , 𝑎𝑎𝑗𝑗 (𝑥𝑥) and𝑉𝑉(𝑥𝑥), respectively, 𝑉𝑉 and
𝑎𝑎(𝑥𝑥) = (𝑎𝑎1 (𝑥𝑥) + 𝑎𝑎2 (𝑥𝑥) + ⋯ + 𝑎𝑎𝑛𝑛 (𝑥𝑥)) ∈ 𝑪𝑪∞ (ℝ𝒏𝒏 , ℝ𝒏𝒏 , … , ℝ𝒏𝒏 ) Are called a scalar potential and a
(magnetic vector potential, respectively, and the corresponding magnetic fields is the skew symmetric Matrix-valued function 𝐵𝐵(𝑥𝑥) = �𝑏𝑏𝑖𝑖𝑖𝑖 (𝑥𝑥)�
1≤𝑖𝑖,𝑗𝑗 ≤𝑛𝑛
; 𝑏𝑏𝑖𝑖𝑖𝑖 (𝑥𝑥) = 𝜕𝜕𝑥𝑥 𝑗𝑗 𝑎𝑎𝑖𝑖 (𝑥𝑥) − 𝜕𝜕𝑥𝑥 𝑖𝑖 𝑎𝑎𝑗𝑗 (𝑥𝑥).
The aim of this work is to give the sufisantes conditions for compactness of the resolvent of such an operator, these conditions shall record the electric potential 𝑉𝑉 and the magnetic fields .
So what is the maximum power of 𝑏𝑏 for which the operator is associated Schrödinger compact resolvent?
[RAM 2016]
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Trust region with conjugate gradient algorithms for a class of nonlinear optimization D. Hachelfi*, Pr.Y. Laskri** and M. L. Sahari*
[email protected] [email protected] [email protected]
Abstract: Descent direction methods and trust region methods are usually used to solve the unconstrained optimization problem.In this work, we are interested in convergence results that use trust regionmethods which employ the conjugate gradient method Day-Yuan version as asubprogramfor each iteration. Further, we penalize the quadratic problemswith constraints and convert them into series of unconstrained problems. Key words:unconstrained optimization, conjugate gradient method Day-Yuan version, Wolf’s rule, trust region methods, penalty method.
[RAM 2016]
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Integral equation in functional spaces(Generalized Lebesgue space𝑳𝑳𝒑𝒑(𝒙𝒙) (𝛀𝛀). Belmechri Firouz
Department of Mathematics, El Bachir El Ibrahimi University, Bordj Bou Arreridj, Algeria
[email protected]
Abstract: The aim of this work is the study: the problem of existence of solutions for integral equation in different functional spaces. Then it is imperative to pass by an assumptional property: the compactness of the integral operator. The compactness of integral operator posses en general a big character in the resolution of several mathematics problems such that the existence of solution for integral equation, this character is based on the theory of: REISZ-FREDHOLM. In this case and in ower these Integral equation in functional spaces. We interested for the problem wish the the compactness of integral equation in functional spaces with using fundamental mathematics properties such that the restriction and the prolengement. Key words:Integral equation, Lebesgue space, Lebesgue space with variable exponent, Hardy littlewood maximal operator, Fractional maximal operator, Reisz fractional operator.
[RAM 2016]
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The homotopy perturbation method for solving some differential equations Mountassir HAMDI CHERIF 1*, Djelloul ZIANE2** 1*Department of Mathematics and informatics, Preparatory school in science and technology, Oran, Algeria.
[email protected]
2**Department of Mathematics, University of Chlef, Algeria
[email protected]
Abstract: In this work, we apply the homotopy perturbation method to numerically solve differential equations and nonlinear partial differential and fractional order. our results are compared with the exact solution, they are illustrated with graphs in Maple. Key words:Homotopy perturbation method, Cahn-Hilliard equation, nonlinear partial differential equations, fractional differential, Fisher's equation, numerical solution. References [1] He, J.H. A coupling method of homotopy technique and perturbation technique for nonlinear problems, Int. J. Non-Linear Mech., 35, (2000), 37-43. [2] S. Momani. M, Z. Odibat, “Homotopy perturbation method for nonlinear partial differential equations of fractional order”, Physics Letters A, 365(2007), 345-350. [3] Podlubny, “Fractional Differential equations”, Academic Press, New York, 1999. [4] S. Momani. M, Z. Odibat, “Homotopy perturbation method for nonlinear partial differential equations of fractional order”, Physics Letters A, 365(2007), 345-350. [5] A. Bouhassoun and M. Hamdi Cherif ; Homotopy Perturbation Method For Solving The Fractional Cahn-Hilliard Equation ; Journal of Interdisciplinary Mathematics., Vol. 18, No. 5, 513524, 2015. [6] Djelloul ZIANE, Kacem BELGHABA and Mountassir HAMDI CHERIF ; Fractional homotopy perturbation transform method for solving the time-fractional KdV, K(2,2) and Burgers equations ; Int. J. Open Problems Compt. Math., Vol. 8, No. 2, 63-75, 2015.
[RAM 2016]
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Modeling of Amorphization Kinetics in SiC Under Ion Implantation Khemisti Akmoum*and Fatiha Chérifi** *
Département Sciences de la Matière, Université El Bachir El Ibrahimi, 34000 Bordj Bou Arreridj, Algérie
[email protected] ** Département de Physique, Université Abdelhamid Ibn Badis, BP 227, 27000 Mostaganem, Algérie
[email protected]
Abstract: This work aims at determining a microscopic criterion for the order-disorder phase transition in SiC under dynamic loading. Our approach considers a statistical treatment of quantic collisions by assuming a Landau type second order transition. Equilibrium thermodynamics does not apply to these systems where an external energy flux exists. The following methodological steps are undertaken: -The construction of a free energy function within the mean field approximation BraggWilliams approximation is introduced for further simplification. -The construction of a kinetic model whose irradiation free steady states coincide with equilibrium states deduced from the thermodynamic model, while irradiation effects are embedded in the model by adding a ballistic jump frequency. -The construction of a stochastic model from a Fokker-Planck type equation to take account of the effect of cascade size. -The criterion for stability being taken as the amorphous phase, we present and discuss the variations of a thermodynamic potential describing the transition as a function of the Landau order parameter for SiC material for different values of the number of displaced atoms characterizing the density of the cascade. The effect of implantation temperature on the potential is also discussed. Key words:Ion implantation, Landau theory, Phase transition, Semiconductors
[RAM 2016]
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A mollification method for a Cauchy problem for the Laplace equation Djenaoui meriem
[email protected]
Saidouni sherif
[email protected]
Abstract: In this paper, we consider a Cauchy problem for the Laplace equation in the strip region 0< ξ < 1; ψ 2 R, where the Cauchy data is given at ξ = 0 and the solution is sought in the interval 0 < ξ · 1. The problem is ill-posed in the sense that the solution (if it exists) does not depend continuously on the data, and a small error in the data can destroys the numerical solution. To solve the problem numerically, a mollification method is considered. Error estimate between the exact solution and its approximation is given. The choices of mollificationparameter for a priori and a posteriori are discussed respectively. Numerical examples show that the method works effectively. Key words:Cauchy problem for Laplace equation; Ill-posed problem; Mollification method.
[RAM 2016]
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Existence of solutions for fractional differential equations involving two fractional orders Houas Mohamed,
[email protected]
Abstract: Differential equations of fractional order have been shown to be very useful in the study of models of many phenomena in various fields of science and engineering, such as visco-elasticity, electrochemistry, control, porous media, etc. Recently, much attention has been focused on the study of the existence of solutions for boundary value problems of fractional differential equations with tow fractional orders by the use of techniques of nonlinear analysis. In this work, we study the existence and uniqueness of solutions for fractional differential equations involving tow Caputo fractional orders. By using the Banach's fixed point theorem, O'Regan fixed point theorem the existence anduniqueness of solutions is obtained.
Key words:
[RAM 2016]
Caputo derivative, Existence, Fixed point theorem, Riemann-Liouville integral.
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ROI Selection of Breast cancer Microcalcifications Based Morphologic Operation and Mixture Parametric Distributions Nizar BEN HAMAD 1*, Med Salim BOUHLEL 2* *
R.U: SETIT – University of Sfax - TUNISIA
[email protected] [email protected]
Abstract: Today’s, Computer Vision applications have various challenges to tackle including analysis time and power savings. The first tool to take up those challenges in the Automated Computer Aided system (CAD) is the selection of the Region of Interest in the Breast. Mammography is recognized to be the best way of early detection of breast cancer. Breast cancer screening campaigns generate a huge flow of mammographic images to diagnosis. This large amount of images requires a large amount of time and energy to be analyzed. In this paper, we propose an effective method to fix the Region of Interest (ROI) in terms of the whole picture. Mathematical tools and morphological filters are used to define the ROI. This first step is followed by a series of pixel labeling and image segmentation based on mixture model of parametric distribution. The Expectation–Maximization algorithm (EM) is used to estimate the parameters of the mixture distributions and assign class labels to all pixels. Different parametric distributions are used to define a suitable finite mixture models for a better ROI selection. The proposed method is applied on CAD microcalcifications detection based wavelet multirésolution analysis. The experimental results show that half of analysis time and power can be saved. Key words:CAD, ROI, Morphological filters, Breast cancer, Microcalcifications, EM
[RAM 2016]
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Simulation of Multi-Stage-Flash plant and development of a data-processing program Salah Frioui Laboratoire LAIGM, Département de Génie des procédés, Faculté de Sciences et de la Technologie, Université 8 Mai 1945 de GuelmaB.P. 401, 24000 Algérie Fax: + 213 37 20 72 68;
[email protected]
Abstract: This paper presents a comprehensive design model of the Multi-Stage-Flash Brine recirculationdesalination plant for sea water. A mathematical model was developed for calculations of the physical properties of the vapor and liquid streams, heat transfer coefficients, and thermodynamic losses taking into consideration the nonlinearity of the thermo-physical properties of seawater and steam. This dependence of system variables on temperature and salinity makes the system equations nonlinear and requires an iterative solution. A computer program (named FLASH) was developed to simulate the operation of this process. The studies on this process have dealt mainly with the design problem where the number of specified stages, top brine temperature and seawater temperature, distillate production are specified and the heat transfer areas, specific heat consumption and operating conditions (temperatures, flow rates, salt concentrations, velocities, etc.) in all stages and the whole process are calculated and a well tested set of correlations. In order to validate the FLASH program, a comparison was made between the predicted results of the program and other simulated results and then calculations concerned a selected plant which was in the refinery in SKIKDA, Algeria. From this study, the program proved to be able to converge reasonably quickly on the desired solution even in wild guesses. Hence the direct substitution approach of solution proved to be successful in our study and such prediction error can be considered acceptable. Key words:MSF desalination plant, simulation, mathematical model, operating conditions. .
[RAM 2016]
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The efficiency GPUs architecture for accelerating iterative reconstruction methods T, NOUIOUA*, A, H, BELBACHIR** *
University of Tebessa (Algeria) tarek,nouioua@gmail,com
**
Auniversity of U S T Oran (Algeria) ahmedhafidbelbachir@gmail,com
Abstract: Iterative reconstruction methods are known for producing accurate image, compared with the analytical methods principally the Filtered Back Projection (FBP). The two methods have a series of backprojection operations which make theme consuming long time for calculation. Even more unfortunately, the iterative methods also incorporate a series of forward projection operations which increase considerably the computational cost. Cluster computers were used to accelerate the iterative methods. Different architectures were used to accelerate these process by using commercial custom-hardware such as Application Specific Integrated Circuit (ASIC) or the other approach which uses Field Programmable Logic Array (FPGA).Hence, while it is economically expensive to use such hardware boards in need for a proven and stable methods, less expensive and suitable solutions are desirable for researchers. Graphics Processing Units (GPUs) offer an alternative approach for accelerating computationally intensive process. This paper describes a fast method using Graphics Processor Units (GPUs) to accelerate iterative methods by performing Backprojection/Projection operations to be efficient as possible. Our approach is based on the use of an heterogeneous platform including CPU and GPU, and using OpenCL programming model on modern GPU platform which provides a parallel computing architecture. Key words: Computed Tomography -GPUs computing- H.P.C.- Image reconstruction - Iterative methods- OpenCL.
[RAM 2016]
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Poster session Nanosciences Section S1 1
Hadj
Baltach
Ab Initio Investigation Of Structural, Electronic And Magnetic Properties Of Tbni5 Compound
2
Radjaa
Benabboun
Etude Ab-Initio Des Propriétés Structurales, Électroniques Et Magnétique Des Composés Semi-Heusler De Type Xyz (Kbab Et Rbbab ) Avec La Gga Et La Tb-Mbj
3
Imane
Khelladi
Etude Quantique Des Dérivés De Tétracène Et De Pentacène
4
Imen
Rais
Etude Structurale Et Magnétique Des Matériaux Multiferoiques Dopés
5
Bouayad
Meriem
Ferrocene As Bulky Functional Group In Glucopyranosides. Structural And
Debbagh 6
Younes
Energetical Structures Computations Using Dft Methods. Menni
Numerical Study Of Turbulent Forced-Convection Flow In A Channel With In-Line Baffles Of Various Shapes
7
Abdelkader
Elhorri
Miloud 8
Zouaoui
Theoretical
Investigation
Of
Derivatives
Benzene,
Stilbene
And
Diphenylacetylene. Structure And Nlo Properties. Mourad
Theoretical Study On Nonlinear Optical Properties And Electronic Spectra Of Pyrène Π –Conjugated In Push-Pull Molecules With Dft And Ab Initio
Rabah
Calculations. 9
Moncef
Ati
Thermodynamic Behavior Of Spin System Using Molecular Dynamcis.
10
Zakaria
Elaoud
Phase Transition And Electrical Properties In 4-Benzylpiperidinium Tetraoxoselenate Monohydrate
11
Abir
Nasri
Magnetic Entropy Changes Of Pr0.6Sr0.4Mno3 Compound.
12
Benmalem
Yasmina
Structural,
Electronic
And
Thermal
Properties
Of
The
Cubic
Antiperovskite-Type Genca3 13
Karima
Bendahou
Synthesis Of Mesoporous Chromium Silicates
14
Sabria
Terkhi
The Laser Wavelength Emitted By The Random Trimer Barrier Superlattices
15
Amrani
Bedia
The
Structural,
Elastic
And
Electronic
Properties
Of
Lutatium-
Monopnictides (Lun, Lup). 16
Rahmoune
Mohammed Theoretical Investigation Of The Electronic Structures And Magnetic Properties Of The Y-Based Quaternary Heusler Alloys
17
Jamila
Dhiflaoui
Theoretical Study Of Alk2+Rg And Alk+Rg (Alk=Be, Mg, Sr And Rg=He, Ar, Kr)
18
Benhamza
RAM 2016
M. E.
Thermal Conductivity Modeling Of Oxide-Water Nanofluids Using “Jmp”
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20
Mohammedi Mohammed Electronic structure, magnetism and robust half-metallicity of new Co-
Imen
Walid
based quaternary Heusler alloys
Saïdi
Band parameters of AlInAs/AlGaAsquantum dots: electronic properties study
21
Aymen
Bouali
Graphene based gas sensor
22
Fatima
Bendahma
Structural Parameters And Their Effect On The Electronic Transport Properties In Aperiodic Profile Superlattice
23
Ali
Hafs
Effect Of Cu Addition On Thermal Stability And The Glass Forming Ability In Fe–Nb–B–Si Bulk Glassy Alloy
24
Redjem
HADEF
Characterization of Turbulent Sooting Flame using Advanced Laser Diagnostics
25
Said
Chikha
Implementation of direct predictive control of variable speed wind energy conversion system based on DFIG
RAM 2016
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Ab Initio Investigation of Structural, Electronic and Magnetic Properties of TbNi5 Compound H. Baltach*, M. A. Monir*, R. Khenata*, T. seddik* and D. Rached**. *
Laboratoire de Physique Quantique et de Modélisation Mathématique, Université de Mascara, 29000Algérie
[email protected] [email protected] [email protected] [email protected] ** Laboratoire des Matériaux Magnétiques, Faculté des Sciences, Université DjillaliLiabès de Sidi Bel-Abbès , Sidi Bel-Abbès (22000), Algérie
[email protected]
Abstract: The spin-polarized, electronic and magnetic properties of TbNi5 inter- metallic compound have been calculated by employing the full-potential linear augmented plane waves (FP-LAPW) within the density functional theory (DFT) and implemented in the WIEN2k package. In this approach, the exchange-correlation potential (XC) is described by the spin-polarized generalized gradient approximation of Perdew-Burke-Ernzerhof with Hubbard U-correction (PBE-GGA+U). The Hubbard term of Coulomb repulsion in the 4f –shell of Tb was taken as U = 3.5eVandJ = 0.7eV. The electronic structure such as band structure and density of states have been investigated. Total and local magnetic moment of Tb and Ni are also estimated it is shown that the total magnetic moment of this alloy is vigorously contributed by the local moment of terbium.
Key words :Density of states, Electronic structure, Intermetallic, Magnetic moment.
RAM 2016
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Ferromagnetism in the half-heusler XBaB (X=K, Rb) compounds from first-principles calculations Radjaa BENABBOUN*, Dalila MESRI** *
Condensed Matter and Sustainable Development Laboratory (LMCDD),Materials and Sustainable Development Department, Djillali Liabes University of Sidi Bel-Abbes, Sidi Bel-Abbes 22000, Algeria.
[email protected] **
Condensed Matter and Sustainable Development Laboratory (LMCDD),Materials and Sustainable Development Department, Djillali Liabes University of Sidi Bel-Abbes, Sidi Bel-Abbes 22000, Algeria.
[email protected]
Abstract: In this work, first principle calculation of structural, electronic, magnetic properties of the half-metallic ferromagnetic Half-Heusler compounds KBaB and RbBaB are presented. We have applied the full-potential linearized augmented plane waves plus local orbitals (FP-LAPW+lo) method based on the density functional theory (DFT). For the exchange and correlation potential generalized-gradient approximation (GGA) is used. We found that the KBaB and RbBaB in the ferromagnetic state are more favorable than the antiferromagnetic state and they exhibits half-metallic ferromagnetism, the computed equilibrium lattice parameters agree well with the available theoretical and experimental data. The calculated total magnetization of 2μB is in excellent agreement with recent experiments. We give also a comparison between the standard generalized gradient approximation (GGA) and the modified Becke–Johnson exchange potential approximation (mBJ–GGA) on the electronic and magnetic properties. Key words:Half-Heusler compound; Half-metallic; Half-metal; FPLAPW + lo
RAM 2016
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Etude Quantique Des Dérivés De Tétracène Et De Pentacène KHELLADI I. 1*, RAHMOUNI A. 2** and RAHAL-SEKKAL M. 3* *
L2MSM Université Djillali Liabes de Sidi Bel Abbes. Algeria
[email protected] [email protected] **
LMMC Université Tahar Moulay de Saida
[email protected]
Abstract: In this work, we report a quantum mechanics study of some organic molecules of interest in the field of NonLinear Optics. For this aim, ab initio calculations have been performed in order to determine some physical parameters such as the polarizabilities and first order hyperpolarizabilities of some tetracene derivatives. Actually, the tetracene molecule was substituted by variuos donors and attractors groups in a way to generate a charge transfer in the obtained system. This later will be responsible on the magnitude of polarizabilities and hyperpolarizabilities defined as NLO parameters. First, SP energy calculations were carried out on a number of isomers using DFT methods. Then full optimizations were further performed. NBO (Natural Bond Orbital) calculations were also done using MP2 method, HOMO and LUMO energies were obtained as well as the corresponding energy gaps. After that, hyperpolarizabilities were computed and compared.
Key words: DFT, MP2, NBO, ONL, tetracène, pentacene
RAM 2016
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Effect of Ni doping on structural and dielectric properties on GaFeO3 Imen Raies *,Rainer Schmidt ** Mongi Amami*
[email protected] [email protected]
Abstract: Multiferroic materials, which exhibit magnetoelectric effects, have attracted considerable attention owing to their scientific interest as well as exciting possibilities for practical applications. Gallium iron oxide GaFeO3 is a member of a multiferroic family, which exhibits ferrimagnetic and piezoelectric properties below room temperature. Herein we present the effect of nickel doping on the structure and dielectric properties, by preparing Ga Fe1-x NixO3 by solid-state reaction.
Key words:Multiferroic , gallium iron oxide ,dielectric properties
RAM 2016
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Ferrocene as bulky functional group in glucopyranosides. Structural and energetical structures computations using DFT methods M. Bouayad-debbagh, A. Benosman, M. Sekkal-Rahal Laboratoire L2MSM, Département de chimie, Faculty of sciences, University Djillali Liabes of Sidi-BelAbbes-22000 Sidi Bel Abbes,Algeria. Laboratoire de Physique Théorique. faculty of Sciences. University of Tlemcen. Algeria
[email protected]
Abstract: Despite their advantageous properties, monosaccharide derived ligands have been rarely applied in the synthesis of organometallic compounds and thus a few information are available about their coordination capabilities. Most of the established monosaccharide–metal complexes are based on late transition metals. Among early transition metals, monosaccharide complexes containing Fe are of importance. The combinations of ferrocene derivatives with this important ligands are of increasing interest especially concerning their medicinal applications, only a few examples using monosaccharides in organometallic chemistry are reported in the literature. Ferrocenyl substituted glucose derivatives are particularly of interest among metallocenes of group eight elements in combination with carbohydrates because of their pharmaceutical activity. The functionalization of methyl D-glucopyranosides at 4 and 6 positions with bulky moieties was carriedout by using ferrocenyl,in particular, we are investigating the 4 and 6 positions of methyl Dglucopyranosides as coordination sites for organometallic complexes of Fe. The quantum chemical molecular orbital method were used in this study, all the calculations were carried out with Gaussian 09, at density functional theory method DFT at the B3LYP level using the 6-31G(d), 6-31+G(d,p), 6-311G(d),6-31++G(d,p), cc-pvdz, and aug-cc-pvdz basis sets, the geometry of the organometallic was optimized. The calculated structural parameters and the total positions of the organometallic do not differ from the experimental data too much. Key words: Organometallic,Monosaccharides, Ferrocene, DFT, Optimization.
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Numerical Study Of Turbulent Forced-Convection Flow In A Channel With In-Line Baffles Of Various Shapes Y. Menni*, C. Zidani*, A. AZZI* and B. Benyoucef*
[email protected] [email protected] [email protected] [email protected]
Abstract: A numerical study of turbulent forced-convection airflow through a two-dimensional rectangular-channel with lower wall-mounted baffles is conducted using the Commercial CFD software Fluent. Several differently shaped baffles (i.e., flat, cascaded rectangular-triangular, and triangular-shaped) under similar operating condition are compared in an in-line arrangement. The computations are based on the finite volume method with the Simple algorithm for handling the pressure-velocity coupling. The effects of the baffle shape geometries as well as Reynolds numbers are examined. The results reveal essentially, that the flow structure of using different baffles is characterized by strong deformations and large recirculation regions. The heat and friction loss behaviors go up with an increase in the Reynolds number, but its values depend on the shape of baffles. The data indicates that the triangular-baffle has a substantially higher thermo-hydraulic performance than any other ones. Key words:flow dynamics, forced convection, cascaded rectangular-triangular baffle, CFD.
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Theoretical investigation of derivatives benzene, stilbene and diphenylacetylene. Structure and NLO properties. A.M. ELHORRI*, M. RAHAL-SEKKAL* and N. YOUSFI* *
Laboratoire de Microscopie, Microanalyse de la matière et Spectroscopie Moléculaire, Université Djilali Liabès, B.P 89, Sidi Bel Abbes 22000, Algerie, Algeria.
[email protected] [email protected] [email protected]
Abstract: MP2 method and different functionals such as M06-HF, M06-2X, CAM-B3LYP, PBE0, B3LYP and M06L incorporating different XC amounts were used to calculate the static first hyperpolarizabilies β(0) of eight molecules which are derivatives of benzene, stilbene and diphenylacetylene. The values were then compared to the experimental ones.The M06-2X functional was then selected for further calculations. NBO calculations were also performed to define the intramolecular charge transfer in each molecule.
Key words:First hyperpolarizability, DFT, TD-DFT, push-pull, molecules. NBO.
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Theoretical Study On Nonlinear Optical Properties And Electronic Spectra Of Pyrène Π –Conjugated In PushPull Molecules With Dft And Ab Initio Calculations. M. Zouaoui Rabah Mourad*, M.Majda Sekkal-Rahal **Yousfi Noureddine*
[email protected],
[email protected] [email protected]
Abstract: In this work, we present a quantum mechanics investigation on the 1,6-divinylpyrene molecule referenced as 1.6 DVP and its derivatives substituted in their ends by donating and withdrawing groups, to evaluate the nonlinear optical properties. Calculations were performed using the density functional theory (DFT) with different functionals (M06HF, M062X, M06L, CAMB3LYP, PBE0, BMK and B3LYP) each including a given exchange amount (% XC) and combined with cc-pvdz basis set.The obtained hyperpolarizabilities were compared with those achieved by MP2 method which is considered as a reference. We demonstrated that the best agreements are obtained with the functional cam- B3LYP. In a second step, we selected among various donor and withdrawing groups, the couple (attractor, donor) giving the best hyperpolarizabilities. Then,calculations of NLO parameters were carried out by testing the multi existing positions on the tree bands pyrene as possible substitutions positions for donor and attractor groups. The solvent effect is of interest in calculating NLO parameters. For this aim, we determined first the specific solvent for this kind of compounds. This study was based on calculating thermodynamic parameters in particular ΔGsolv by the SMD method. The properties of the excited states of the molecule 1.6 DVP di-substituted gas phase and different solvents were obtained by the method based on the "Time-Dependent-Density Functional" (TD-DFT), and the solvent effects were introduced by the model PCM (Polarized Continuum model).
Key words: pyrene,pyrene derivatives,DFT,ab initio,TD-DFT,Gibbs energy of solvation (ΔGsolv).
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Thermodynamic Behavior Of Spin System Using Molecular Dynamcis Simulation. ATI Moncef*, Rachid Bouamrane* *
University Of Sciences And Technology of Oran-Algeria
[email protected]
Abstract: We use molecular dynamics simulation to study the thermodynamics of spin interacting system in the one-dimensional ferromagnet in a linear chain range, where the temperature is controlled by the velocity scaling thermostat. A critical temperature Tc was found using different sizes N of the chain using the maximum of the heat of capacity. We have also calculated the fourth binder cumulant and the magnetization parameters for the model. Key words: molecular dynamics simulation, binder cumulant, spin-spin interacting, critical temperature.
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Phase transition and electrical properties in 4benzylpiperidinium tetraoxoselenate monohydrate Yassmin Kessentinia, Salah AL-Juaidb, Tahar Mhiria, Zakaria Elaouda * a
Laboratoire physico-chimie de l’Etat Solide, Faculté des Sciences de Sfax, BP. N° 1171, 3000, Tunisie.
[email protected]
b
University of king Abdulaziz, Department of Chemistry, Faculty of Sciences of Jeddah, Saudi Arabia.
Abstract:
The thermal properties of the organic-inorganic hybrid material(C12 H10 N)2 SeO4 H2 Ohave been
investigated using X-ray diffraction, Raman spectroscopy, impedance and modulus spectroscopy technique. Single X-ray diffraction recorded at three different temperatures: T1 = 82 K, T2 = 293 K
and T3 = 328 K reveals that the title compoundcrystallizes in the same space group (𝑃𝑃21/𝐶𝐶 ) for the
different temperature and the lattice parameters don’t exhibit a remarkable variation. This result indicates clearly that this material does not present a structural phase transition and confirm our previous interpretation of order disorder phase transition detected by DCS measurement at 300 K. Raman spectroscopy at various temperatures confirm the presence of the phase transition at 300 K and showed that both anionic and cationic motions contribute to the transition mechanisms. The character order disorder phase transition is undoubtedly related to the change in dynamical state of (𝑆𝑆𝑆𝑆𝑂𝑂4 )2− anion coupled with conformational change of [C6 H5 CH2 C5 H9 NH2 ]+cation above 300 K. The close values of activation energies obtained from the analysis of hopping frequency, electric
modulus and dc conductivity indicate that the transport in the title compound can be described through a simple hopping mechanism, dominated probably by the orientation of selenate anions. Key words:Hybrid compound, Crystal Structure, Impedance Spectroscopy.
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Magnetic entropy change of Pr0.6Sr0.4MnO3 A. Nasri*, M. Ellouze*, E.K. Hlil**, F. Elhalouani*** *
Sfax University, Faculty of Sciences of Sfax, B. P. 1171, 3000 Sfax, Tunisia
[email protected] [email protected]
**
Institut Néel, CNRS and Université Joseph Fourier, BP 166, F-38042 Grenoble cedex 9, France
[email protected] ***
Sfax University, National School of Engineers, LASEM B.P. W, 3038 Sfax,Tunisia.
[email protected]
Abstract: In the present work, we analyze the magnetic transition and magnetic entropy change ∆S M of Pr0.6Sr0.4MnO3 sample. Using Arrott plots, we report that the phase transition for Pr0.6Sr0.4MnO3 sample is of second-order. From the magnetization measurements at temperature close to the Curie temperature, the magnetic entropy change, ∆S M and the Relative Cooling Power (RCP) have been estimated. The maximum of magnetic entropy change ∆S Mmax reaches, under an applied magnetic field of 5 T, 3.58 J/kg K for ourcompound. The RCP value has been estimated to 159.37 J/kg. A large magnetocaloric effect is also observed in this sample near 279Ksuggesting that this material can be used as magnetic refrigerant.
Key words:Manganite, Magnetic transition, Magnetic entropy change.
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Structural, elastic, electronic and thermal properties of the cubic antiperovskite compoundsGeNCa3 Y.Benmalem*1, A.Abbad**1, H.A.Bentounes1,W.Benstaali2 ,T.lantri2 *
email :
[email protected] ** email :
[email protected]
Abstract: The structure of antiperovskite also called (perovskite-inverse) identical to the perovskite structure of the general formula ABX3, where A is a main group (III–V) element or a metallic element, B is carbon or nitrogen, and X is a transition metal, displays a wide range of interesting physical properties,such as giant magnetoresistance. This work presents a theoretical study, within the density functional theory framework (DFT) and the pseudo-potentials with planes waves approach, of the structural, electronic and thermodynamic properties of the antipérovskite compound GeNCa3 within the two approximations for exchangecorrelation energy: local density approximation (LSDA) and the generalized gradient approximation of Perdew-BurkeErnzerhof (GGA), as implemented in the Wien2kcomputer package. The thermodynamic properties ofGeNCa3under high temperature and high pressure have been investigated by using the GIBBSprogram which is based on the quasi-harmonic Debye model. The study of this compound has confirmed the effectiveness of the two approximations andthe ground-state properties are in good agreement withexperimental data and theoretical results available. Keywords:FP-LAPW,LSDA, GGA, antiperovskites, Electronic properties,Therodynamicpropertie.
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Synthesis of mesoporous Chromium silicates K. Bendahou a, L. Chérif a, S. Siffert b,c,d, A. Bengueddach e, A. Aboukaïs b,c a
Laboratoire de catalyse et synthèse en chimie organique PB 119, Université de Tlemcen, Algérie b
Univ Lille Nord de France, F-59000 Lille, France c ULCO, LCE, F-59140 Dunkerque, France d ULCO, CCM, F-59140 Dunkerque, France
[email protected] [email protected] a Laboratoire de catalyse et synthèse en chimie organique PB 119, Université de Tlemcen, Algérie
[email protected]
Abstract: The design and synthesis of metal-containing mesoporous materials having pore sizes greater than 2 nm are the main areas of research in the last decade, because their high surface area and pore size help to overcome the limitations of the conventional small pore zeolite catalysts Chromium–incorporated mesoporous silica materials (MCrS) have been successfully prepared in strong acidic media by assembly of preformed CrS1 precursors with triblock copolymer of the Pluronic type (P123) by a two steps procedure. Various technics including XRD, N2 adsorption, FT-IR spectroscopy, diffuse reflectance UV–vis (DRUV–vis) and EPR were employed for the materials characterization. MCrS materials have a hexagonal structure with uniform mesopores. Keywords: Zeolite precursors, CrS-1,Chromosilicates , Mesoporous
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The laser wavelength emitted by the random trimer barrier superlattices S. Terkhi, S. Bentata, Z. Aziz, Z. F. Meghoufel, S. Cherid and A. Sefir Laboratory of Technology and Solid’s Properties, Faculty of Sciences and Technology, Abdelhamid Ibn Badis University, BP 227, Algeria.
[email protected]
Abstract: We theoretically study the effects of short-range correlated disorder and applied bias on the nature the transport properties of InAs/Ga1-xInxAs superlattices. We consider layers having identical thickness where the (In) concentration x takes at random two different values with the constraint that one of them appears only in trimer, forming a Random Trimer Barrier Superlattices (RTBSL). The transfer-matrix technique and the exact Airy function formalism havebeen used to determine the miniband structure and the transmission coefficient of these stuctures. In the case of unbiased, we observed that the introduction of a disorder correlated into these systems prevent the localisation and causes delocalisation wide states. This behavior is due to the Trimer tunnelling state originated for the basics cells of three singular barriers. On the other hand, in the case of biased systems, we see the decrease of the miniband width until the complete disappearance for high values of Va. Finally, the electron in this structureemits in the middle infrared region. Thus, these dispositives canbe applied in the infrared photodetectors.
Key words:Random Timer Barrier, Transfer-matrix technique,Superlattice.
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Ab-initio of structural, electronic and elastic properties of lutatium mono-pnictides B. Amrani*, A. Chahed*, A. Amar*, H. Rozale*, A. Lakdja* and A. Sayede** *
Condensed Matter and sustainable development Laboratory (LMCDD), University of Sidi Bel-Abbes, Sidi Bel-Abbes 22000, Algeria
**
[email protected] [email protected] [email protected] [email protected] [email protected]
UCCS, CNRS-UMR 8181, Université d’Artois, Faculté des Sciences Jean Perrin, Rue Jean Souvraz, SP 18, 62307 Lens Cedex, France
[email protected]
Abstract: The structural, elastic and electronic properties of lutatium mono-pnictides (LuN and LuP) were analyzed using ab initio calculations based on thedensity functional theory and full-potential linearized augmented plane wave within generalized gradient approximation in the stable cubic with space group Fm-3m. The electronic structure calculations show that LuN is semiconductor at ambient conditions with an indirect band gap while other LuP are metallic. The structural properties, viz, equilibrium lattice constant, bulk modulus and its pressure derivative, equation of state, band gap and elastic moduli are presented and show good agreement with available data.
Keywords: Density functional theory; Lutatium mono-pnictides compounds; Band structure; Elastic constants.
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Phase Stability, Band Gap, and Electronic and Magnetic Properties of Y-based Quaternary Heusler alloys M. Rahmoune*, A. Chahed*, A. Amar*, H. Rozale*, A. Lakdja* and A. Sayede** *
Condensed Matter and sustainable development Laboratory (LMCDD), University of Sidi Bel-Abbes, Sidi Bel-Abbes 22000, Algeria
[email protected] [email protected] [email protected] [email protected] [email protected]
**
UCCS, CNRS-UMR 8181, Université d’Artois, Faculté des Sciences Jean Perrin, Rue Jean Souvraz, SP 18, 62307 Lens Cedex, France
[email protected]
Abstract: In this work, first-principles calculations of the structural, electronic and magnetic properties of the new Y-based Heusler alloys are presented. We have applied the full-potential linearized augmented plane waves (FP-LAPW) method based on the density functional theory (DFT). The structural results showed these compounds in the stable structure of type1+FM were true halfmetallic (HM) ferromagnets. The minority (half-metallic) band gaps were found to be large. The characteristic of energy bands and origin of minority band gaps were also studied. The half-metallic band gap arises from t1u-t2gsplitting but not eu-t1usplitting.The total magnetic moments are 4 μBper unit cell, following the Slater−Pauling rule with the total number of valence electrons minus 18 rather than 24. In addition, the effect of volumetric and tetragonal strain on HM character is studied. Also, we have investigated the structural, electronic and magnetic properties of the doped Heusler alloys (x= 0, 0.25, 0.5, 0.75, 1). The composition dependence of the lattice parameter obtained obeys Vegard’s law. All alloy compositions exhibit HM ferromagnetic behavior with a high Curie temperature (TC). Keywords:Density functional theory; Quaternary Heusler compounds; Half-metallic ferromagnetic; Magnetism
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Theoretical Investigation of the Electronic Structure and Spectra of M2+RG and M+RG (M=Be, Mg, Sr and RG= He, Ar, Kr). J. Dhiflaoui*, 1 and H. Berriche*,**, 2 *
Laboratory of Interfaces and Advanced Materials, Physics Department, Faculty of Science, University of Monastir, Avenue de L’Environnment, 5019 Monastir, Tunisia 1
[email protected]
*
Laboratory of Interfaces and Advanced Materials, Physics Department, Faculty of Science, University of Monastir, Avenue de L’Environnment, 5019 Monastir, Tunisia ** Department of Mathematics and Natural Sciences, School of Arts and Sciences, American University of Ras Al Khaimah, Ras Al Khaimah, P.O. Box, RAK, United Arab Emirates 2
[email protected]
Abstract: The potential energy curves, spectroscopic constants and dipole moment curves for the ground and excited states of M+RG system are calculated with an ab initio method using pseudopotential techniques and core polarization potentials. This technique is used to replace the effect of the M2+ core and the electron-RG interactions. Furthermore, a core-core interaction is included. This has allowed to reduce the number of active electrons of the M+RG van der Waals system to only one electron and to use large basis sets for the M+ and RG atoms. Therefore, the potential energy of the ground state as well as the excited states are performed at the SCF level and the spin-orbit interaction is incorporated. The core-core interaction for M2+RG ground state is included using accurate RCCSD (T) calculations. The spectroscopic constants of the M+RG states are derived and compared with the available theoretical works. Such comparison has shown a very good agreement for the ground and the first excited states. Moreover, the transition dipole function has been determined for a large and dense grid of internuclear distances including the spin-orbit effect. Key words:pseudopotential techniques, spin-orbit interaction, transition dipole function.
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Thermal conductivity modeling of oxide-water nanofluids using “JMP” Wassila Grine (1)& M. E. Hocine BENHAMZA (2) (1)(2)
Laboratoire d’Analyses Industrielles et Génie des Matériaux (L.A.I.G.M) Université 8 Mai 1945 Guelma, Algérie (1)
[email protected] (2)
[email protected]
Abstract: The nanofluids are solutions composed of particles of a nanometric size suspended in a liquid.Studies of these composite fluids show interesting aptitudes specifically: a better thermal conductivity and a coefficient of convective exchange significantly increased compared to traditional liquids, water in particular. Such an increase in the nanofluid thermal conductivity can not only be attributed to the greatest thermal conductivity of the suspended nanoparticles.The improvement comes also from a combination of several simultaneous physical factors with variable importance. On thisnanometricscaleand without doubt, the thermal behavior does not share the models of larger structures, and thus furtherresearch is requiredin order to develop other more suitable models with new factorsthat explain what is observed. Particular phenomena, which have a negligible influence in macroscopic structures, take all their importance when the scale size approaches that of the atoms.Among the most representative phenomena to explain the thermal potential of a nanofluid, are nanoparticles Brownian movement, scheduling of atoms of the liquid on their surface, regroupings effects which create fast ways for the transportation of energy as well as ballistic nature rather than diffusive nanoparticulesheat conduction. The present study consists of modeling these phenomena and finding an adequate model to be used in heat transfer nanofluides simulation.Thus the aim of the present study is to found an adequate model to estimate the Oxide-Water nanofluide thermal conductivity ratio (TCR) as a function of different factors, and that by using ExperimentsDesign “JMP”. Results show that the created model predicts well the phenomena with an excellent predictive ability. Key words:Design of experiments,nanoparticle, thermal conductivity, oxide-water nanofluides.
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Electronic structure, magnetism and robust halfmetallicity of new Co-based quaternary Heusler alloys M.W. Mohammedi*, A. Chahed*, A. Amar*, H. Rozale*, A. Lakdja* and A. Sayede** *
Condensed Matter and sustainable development Laboratory (LMCDD), University of Sidi Bel-Abbes, Sidi Bel-Abbes 22000, Algeria
**
[email protected] [email protected] [email protected] [email protected] [email protected]
UCCS, CNRS-UMR 8181, Université d’Artois, Faculté des Sciences Jean Perrin, Rue Jean Souvraz, SP 18, 62307 Lens Cedex, France
[email protected]
Abstract: A first-principles approach is used to study the structural, electronic and magnetic properties of new Co-based quaternary Heusler alloys using full-potential linearized augmented plane wave (FP-LAPW) scheme within the generalized gradient approximation (GGA) and GGA plus modified Becke and Johnson as the exchange correlation (GGA-mBJ) for comparison on the electronic and magnetic properties. Our calculations predict these alloys are half-metallic ferromagnets (HMFs) with a half-metallic gap EHM. We also find that the half-metallicity is maintained onawiderangeoflatticeconstants. Moreover, all of these alloys have a negative formationenergy, which implies that they can be synthesized experimentally.
Key words:Half-metallicity, Heusler alloy, Ferrimagnetism, Density functional theory
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Band parameters of AlInAs/AlGaAsquantum dots: electronic properties study I. Saïdi*, R. Ben Aich, S. Ben Radhia and K. Boujdaria** *
**
[email protected] [email protected]
Abstract: Recently, an increasing attention has been devoted to self-assembled semiconductor quantum dots (QDs) owing to of their meaning in physics and for many applications such astunable lasers [1, 2], light-emitting diodes [3] and biological markers [4]. In this work we present our theoretical approach to calculating the excitonic ground state of AlInAs/AlGaAs self-assembled QD. The theory used is based essentially on a good description of the electronic structure of strained constituent materials. The band structure calculation is generally used as the most important source of band parameters data. Moreover, the band offsets for such systems are among the important parameters which determine band alignment of the AlInAs/AlGaAs heterostructure.
Key words:quantum dots, type-I quantum dots, exciton binding energy References: [1] Klimov V I, Mikhailovsky A A, Xu S, Malko A,Hollingsworth J A, Leatherdale C A, Eisler H J andBawendi M G 2000 Science 290 314 [2] Klimov V I, Ivanov S A, Nanda J, Achermann M, Bezel I,McGuire J A and Piryatinski A 2007 Nature 447 441 [3] Schmidt R et al 2006 Appl. Phys. Lett. 88 121115 [4] Bruchez M, Moronne M, Gin P, Weiss S and Alivisatos A P1998 Science 281 2013
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Graphene based gas sensor A. Bouali*, A. Madouri** and F. Ben Cheikh Larbi* *Laboratoire de Physico-Chimie et de Microstructures et Microsystèmes IPEST, BP51 La Marsa, Tunisie,
[email protected] [email protected] ** Laboratoire de Photonique et de Nanostructures – CNRS, Route de Nozay, 91460 Marcoussis, France
[email protected]
Abstract: Graphene is one of the promising elements in technological development, especially in the manufacturing of sensors for toxic gases. Our work which is based on graphene cvd, consists in making circuits sensitive to extremely small flows of NO2 gas ( 2 sccm). For reasons of safety, the graphene used for detection is placed under high vacuum, with the hope of later establishing a law of variation as a function of the pressure. Owing to our efforts at controlling the quality of CVD graphene, we managed to obtain wafer that allows us to detect these low flows with a resistance variation of the order of 200 ohms in 10 seconds. Key words: Chemical vapor deposition, Gas sensor, Graphene, Nitrogen dioxide sensor.
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Structural parameters and their effect on the electronic transport properties in aperiodic profile superlattice F. Bendahma 1*, S. Cherid 2**, and Y. Sefir 3* *
University of Mostaganem
[email protected] [email protected]
**
University of Mostaganem
[email protected]
Abstract: We examine the electronic transport properties in AlxGa1-xAs/ GaAs superlattices. Using the transfer-matrix technique and the exact Airy function formalism, we investigate theoreticaly the effect of structural parameters on the electronic energy spectra of trimer thickness barrier (TTB). It’s shown that increasing the width of superlattice’s well dw allows to the minibands’s confinement inside quantum wells. The barrier thickness db2 and the barrier height V control respectely the intraction force between neighboring eigenstates and the structural disorder degree. We conclude that the variation of structural parameters measures the devices’s response based on these systems are using their resonant tunneling time. Key words:Electronic transport properties, Structural parameters, Superlattice, Transfer-matrix technique.
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Effect of Cu addition on thermal stability and the glass forming ability in Fe–Nb–B–Si bulk glassy alloy A.Hafs*, T.Hafs**, L.Redouani*, *
Physicochemical of materials laboratory,chadli bendjedid university, el tarf, Algeria.
**
[email protected] [email protected]
Laboratory study and research in instrumentation and advanced communication , University BadjiMokhtar, Annaba, Algeria.
[email protected]
Abstract: In the present work, the glass formation of Fe72-xNb4B20Si4Cux(x=0,2) alloys has been investigated. Wedge shaped bulk samples, with thickness from 4 mm, were prepared by copper mold casting technique. Thermal and structural properties were measured using High Temperature Differential Scanning Calorimetry and X-ray diffraction, respectively. Mechanical properties of bulk Fe72-xNb4B20Si4Cux(x=0,2) alloys measured by compression tests at room temperature.The fracture and morphologies after compression test observed by Scanning Electron Microscopy (SEM) a revealed the fragile plastic of the alloys.Thermal and structural properties were measured using High Temperature Differential Scanning Calorimetry and X-ray diffraction, respectively.
Key words: Bulk Metallic Glass; Glass Forming Ability; Thermal Stability; compression.
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Characterization of Turbulent Pressurized Sooting Flames using Advanced Laser-based Diagnostics R.Hadef *, K-P Geigle**, W. O’Loughlin**, M. Stöhr**, M. Köhler**, C. Eberle** and W.Meier** *
Département de Mécanique, Université Larbi Ben M’Hidi, Oum El Bouaghi, Algérie
[email protected]
**
Institute of Combustion Technology, German Aerospace Center (DLR), Stuttgart, Germany
Abstract: Multiple laser-based diagnostics were applied to sooting pressurized swirl flames, operated with ethylene/air in an aero-engine model combustor. The time-averaged quantities soot volume fraction, 3D velocity and temperature as well as distributions of OH and PAH provide a general description of the studied flames. More detailed understanding could be achieved by correlation of instantaneous distributions of the planar quantities. Instantaneous local coexistence of soot and OH is minor; soot is mainly present in gaps left in the OH distribution, and appears either isolated as transported soot or linked to clouds of polycyclic aromatic hydrocarbons (PAH) during the soot inception process. Soot formation mainly occurs in regions of low velocity and flow rates where long residence times for rich fluid elements prevail. Those conditions exist in the inner recirculation zone of the combustor. Detailed temperature statistics complement the data set and confirm a strong impact of oxidation air, which is injected after two thirds of the combustor, far upstream into the inner recirculation zone.In addition to the experimental characterization of the test cases the performance of a sophisticated soot model is demonstrated for some selected quantities. The shape of the predicted soot distribution agrees well with experiments while soot concentrations are predicted too high. Calculated soot live times seem to be too short, as soot decomposes early relative to experiments. The modeled instantaneous spatial correlation of soot and OH also agrees with experiments. Thus our modelling approach is promising for future application to technical combustion. In general, the experimental flow field characterization and the correlation with soot presence, in complement of the other quantities measured, are expected to provide a valuable contribution to soot model validation
Key words:Flame, Laser Induced Incandescence, Particle Image velocimetry, Soot, Turbulence
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Implementation of direct predictive control of variable speed wind energy conversion system based on DFIG Said Chikha*, Adel Mehdi**, Abdellatif Reama** and Kamel Barra* *
Oum El Bouaghi University, 04000, Algeria
[email protected] [email protected] **
ESIEE-ParisBP 99 2, Bd Blaise Pascal, Cité Descartes 93162 Noisy le Grand Cedex ddress of author 3
[email protected]
Abstract: The paper presents the design and the implementation of an improved predictive direct control of a variable speed wind energy conversion system. The conversion chain uses a Doubly Fed Induction Generator whereas the control method is based on Finite States Model Predictive Control. The proposed control method selects the optimal switching state of the inverter that minimizes a defined cost function. The proposed predictive control strategy uses two sample time predictions and it is intuitive since it is simple for implementation. In order to adjust the measured rotor currents to track their reference values, the error between orthogonal rotor current components predictions to their computed values are used to select the optimal vector and applied on the power converter in the rotor side at the next sampling time. The present control algorithm keeps the Dclink voltage constant and guarantee that the whole system functioning with unity power factor. Experimental results demonstrate the effectiveness and robustness of the proposed control strategy.
Key words:Cost function,DFIG, finite states-space model, predictive control, variable speed wind energy conversion system.
RAM 2016
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Poster session Nanosciences Section S2 1
Fatma
Ben Slama Electrical proprieties of ITO/PCDTBT:Graphene/Al organic device
2
Saad
Ali
Polypyrrole/Ag/mesoporous silica nanocomposites: design by in situ UVinduced polymerization and antibacterial activity
3
Ali
Hafs
Investigation Of Glass Forming Ability, Crystallization Kinetics And Magnetic Properties Of Melt-Spun Fe72-Xnb4B20Si4Cux Amorphous Alloys (X = 0, 2) In The Form Of Ribbons
4
Afaf
Gadalla
The size effect of core/shell semiconductors nanoparticle via optical properties
5
Sami
Elyacoubi
Magnetocaloric Effect in SmFe1-xMnxO3 perovskite
Ben Said
Optical and ac conductivity on heavely Zr-doped Mn3O4 thin films for
Erchidi 6
Lilia
optoelectronic applications 7
Khadoudj
Guessoum Synthèse chimiques et caractérisation structurale des produits de corrosion des nouveaux alliages Zinc-terre rare.
8
9
Mohammedi Mohamed
Gheriballah
A First-Principle Study On The Properties Of A New Series Of Quaternary
Walid
Heusler Alloys.
Slimane
A First-Principles Study Of Half-Metallicity And Magnetic Properties Of FullHeusler Alloys Zr2Crx (X = Ga, In)
10 Abdelkader
Hlel
Acceptor/Donor End Capped Phenylene-Thiophene Co-Oligomers Toward Efficiencies Organic Electronic Devices
11 Chahed
Abbes
Effect Of Doping And Pressure On The Magnetic Properties For Co-Based Quaternary Heusler Alloy.
12 Dorria
Fatnassi
Effect
Of
Iron
On
Magnetic
And
Magnetocaloric
Properties
Of
La0.8Ca0.2Mn1-Xfexo3 13 Yamina
Sefir
Effect Of The Structural Parameters On Subbands Of Fibonacci Alxga1Xas/Gaas Superlattices
14 Nouara
Massout
Étude Dft: Calcul Des Constantes De Vitesse Des Équilibres Tautomères Du Médicament "Imexon"
15 Noureddine
Yousfi
Heterocyclic
Nonlinear
Optical
Chromophores
Composed
Of
Changes
In
Dicyanoimidazol 16 Rim
RAM 2016
Cherif
Magnetic
Transition
And
Magnetic
Entropy
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Hammamet, Tunisia, September 16-18, 2016 La0.6Pr0.1Ba0.3Mn0.9Fe0.1O3 17 Iskander
Walha
Magnetocaloric And Critical Behavior In The La0.6Ca0.3O0.1Mno3 Manganese Oxide
18 Hayet
Moumeni
Nanostructured Fe Powders: Structure And Thermal Properties
19 Abderrafik
Nemamcha Production Of Palladium Nanoparticles/Silica Nanocomposite For Water Purification
20 Souhir
Mseddi
Propagation Of Bleustein-Gulyaev Waves In Piezoelectric Bst Layered Structures
21 Nasser
Chelouah
The effect of the addition of ground olive stones on the physical and mechanical properties of clay bricks
22 Imen
Saïdi
Origin of indirect optical transitions in Al0.45In0.55As/Al0.66Ga0.34As quantum dots
23 Bahroune
Moufida
Corrosion behaviour of dc magnetron sputtered aluminium coatings
24 Yasser
Belkacem
Control of the Wind Power Generation using Doubly Fed Induction Generators
25 Mohamed Hedi 26 Mousa
Ben
Influences Of Anisotropy On Band Gaps Of 2d Phononic Crystal With
Ghozlen
Hexagonal Inclusions
Al-Noaimi
Ruthenium (II) diamine complexes incorporating azoimine ancillary ligands. Synthesis, spectral, crystal structure and DFT calculations and catalytic activity in the hydrogenation of α,β-unsaturated aldehyde
RAM 2016
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Electrical proprieties of ITO/PCDTBT: Graphene/Al organic device F. Ben Slama*, R. Bkakri*, A. Bouazizi* *
Address of Author 1,2& Author 3
[email protected] [email protected] [email protected]
Abstract: The study of electrical proprieties of organic diode (OLEDs) based on PCDTBT:Graphene heterojunction, for two different weight ratio % of graphene 1.5 and 2wt. % have been investigated. The electrical characterization of ITO/PCDTBT/Al and ITO/PCDTBT: Graphene/Al structures have been determined from current-voltage characteristics in dark condition. The electrical conductivity results show that the addition of graphene layers in the PCDTBT matrix increase the current density and decrease the threshold voltage Vs. ITO/PCDTBT:Graphene/AL structures indicates a non-ideal current-voltage behavior. The conduction mechanisms was studied by analyzing the logarithmic I-V curves.
Key words: PCDTBT: Graphene, nanocomposite, charge transport,I-V characteristic, Dark condition.
RAM 2016
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Polypyrrole/Ag/mesoporous silica nanocomposites: design by in situ UV-induced polymerization and antibacterial activity Ali Saada,b,*, Eva Cabetc, Alain Lilienbaumc, Manef Abderrabbaa, Sena Hamadid, Mohamed M. Chehimid,* a) b) c) d)
Laboratory of Materials, Molecules and Applications, IPEST, University of Carthage, Sidi Bou Said road, B.P. 51 2070, La Marsa, Tunisia. Faculté des Sciences de Tunis, Université El Manar, PO Box 248, El Manar II, 2092, Tunis, Tunisia Univ Paris Diderot, Sorbonne Paris Cité, BFA, UMR CNRS 8251, 4 rue Marie-Andrée Lagroua Weill-Halle 75013, Paris, France Université Paris Est, ICMPE (UMR 7182), CNRS, UPEC, 2-8 rue Henri Dunant, 94320 Thiais, France.
Abstract: This work describes an easy and simple method for the synthesis of nanocomposites silver/polypyrole incorporated amine-functionalized mesoporous silica (SBA-15) by oxidative photopolymerization of pyrrole in the presence of aminosilanized SBA-15 silica acting as a support and using AgNO3 as a photosensitizer. Nanocomposites as well as their precursors, were characterized by several methods including infrared (IR), X-ray diffraction (XRD), N2 adsorption– desorption isotherms, X-ray photoelectron spectroscopy (XPS),thermogravimetric analysis (TGA) and transmission electron microscopy (TEM).These complementary techniques brought strong supporting evidence for the silanization process followed by oxidative photopolymerisation. The surface composition was found to be PPy-rich as judged by XPS. Petri dishes were loaded with various amounts of nanocomposites in order to compare at once their antibacterial effects. The antibacterial
performances
of
the
ternary
nanocomposites
depend
not
only
on
the
photopolymerization process but also on the efficient silanization of the underlying SBA-15. Indeed, this pretreatment step permits to tightly bind polypyrrole-silver to SBA-15 which ensures the robustness of the PPy/Ag/NH2-SBA-15 nanocomposites on the one hand, and continuous PPy/Ag top layer for maximal antibacterial effect. Keywords: mesoporous silica, polypyrrole, silver, photopolymerization, nanocomposite, antibacterial application Corresponding authors: Ali Saad:
[email protected] Mohamed M. Chehimi:
[email protected]
RAM 2016
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Investigation of glass forming ability, crystallization kinetics and magnetic properties of melt-spun Fe72-xNb4B20Si4Cux amorphous alloys (x=0, 2) in the form of ribbons A.Hafs*, T.Hafs**, L.Redouani*, *
Physicochemical of materials laboratory,chadli bendjedid university, el tarf, Algeria.
[email protected] [email protected]
**
Laboratory study and research in instrumentation and advanced communication , University BadjiMokhtar, Annaba, Algeria.
[email protected]
Abstract: Amorphous Fe72-xNb4B20Si4Cux (x = 0, 2) samples in the form of a ribbon with a thickness of approximately 30 μm and a width of about 4 mm have been investigated. The ribbons were obtained by a single roller melt-spinning method with the wheel linear velocity equal to 35 m/s.The absence of a crystalline phase was confirmed by X-ray diffraction and differential scanning calorimetry examinations. The effect of high temperature on the isothermal crystallization of Fe72xNb4B20Si4Cux
(x = 0, 2) ribbon was investigated by HTX-ray diffraction. In addition, these ribbon
glasses also exhibit good soft magnetic properties with M-H curvature measured under the magnetic fields between –1 kOe and 1 kOe.
Key words:Ribbons; Thermal Stability; HTX-raydiffraction;Magnetic.
RAM 2016
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Synthesis and Optical properties of Core/Shell SemiconductorsNanocrystals Afaf Gadalla Physics Department, Faculty of Science, Assiut University, Assiut-Egypt
[email protected]
Abstract: The introduction of quantum dots into semiconducting materials provides an avenue for measuring the effective band gap by of control of particle size. Here, we investigate a composite material consisting of CdSe particles (core) which have been synthesized by modified organometallic precursors with a larger band gap CdS as an inorganic (shell) material to coat CdSe Nanoparticles NPs. The shell sizes are estimated from x-ray diffraction by Debye-Scherer formula and compared with high resolution electron microscopy (HRTEM) and optical spectra. The shape of CdSe/CdS NPs is spherical and revels that the CdS shell (higher contrast) almost fully cover the CdSe core with thickness ~ 2-4 nm. Using UV-vis spectroscopy, a systematic red shift in the absorption and emission spectra are observed after the deposition of CdS which confirms the shell growth over the CdSe core. The Uv-vis absorption spectra of the synthesized Quantum Dot QD nanocomposites were recorded and show a blue shift which confirms the presence of quantum confinement. The measurements also show an increase in band gap size with decrease in nanoparticle size, as expected. The UV-vis spectra also show that the direct band gap of CdSe and CdSe/CdS is 2.26 EV. & 2, 47 EV., respectively. The emission spectra of the CdSe and CdSe/CdS are centered at 484 nm and 514 nm, respectively, which clear indication of strong dependence on the size distribution of the particles and on their surface states. These results suggest that CdSe/CdS QD nanoparticles are useful for numerous applications in optoelectronics and photonics.
Key Words: CdSe/CdS nanoparticle, Quantum dots, Optical spectra, X-ray and HRTEM
RAM 2016
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Magnetocaloric Effect in SmFe1-xMnxO3 perovskite S. E. ElYacoubi, R. Masrour, A. Jabar Laboratory of Materials, Processes, Environment and Quality, Cady Ayyed University, National School of Applied Sciences, PB 63 46000, Safi, Morocco.
Abstract: The magnetic properties of SmFe1-xMnxO3 (SFMO) complex perovskitesamples,are studied by Monte Carlo simulation. X-ray powder diffractionindicates the formation of single phaseperovskite with orthorhombic structure. The total and partial magnetizations of our system have been calculated. Lowmagnetic field calculations shows remarkable transition at 234 K related to spin reorientation. The critical temperatures of SFMO are obtained for different dilutions x. The entropyvariation from magnetocaloric effect shows power law as function of applied magneticfield with maximum entropy change is obtained. Critical exponentsextracted from ΔS vs. external magnetic field presents a remarkable sharp peak near antiferromagneticto weak ferromagnetic transition temperature.
RAM 2016
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Optical and ac conductivity investigations on heavily Zr-doped Mn3O4 thin films for optoelectronic applications L. Ben Said 1, 2, M. Amlouk 1,2 1
Unité de physique des dispositifs a semi-conducteurs, Faculté des sciences de Tunis, Tunis El Manar University, 2092 Tunis, Tunisia. 2 Faculté des Sciences de Bizerte, Zarzouna 702, Bizerte, Carthage University, Tunisia.
[email protected] [email protected]
Abstract: In this work some optical as well as electrical properties of Zr-doped Mn3O4 (0 up to 20 at.%) sprayed thin films have been discussed. The refractive index and the extinction coefficient values in terms of Zr content were deduced from transmittance and reflectance data. Moreover, the electrical conductivity and conduction mechanism have been investigated based on the impedance measurements in the frequency range (5 Hz – 13 MHz) at several temperatures ( 320°C – 450°C). The temperature dependence of ac conductivity is reasonably well interpreted by the correlated barrier (CBH) model. Key words:ac conductivity, Mn3O4, optical constants, thin films.
RAM 2016
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Chemical Synthesis and Structural Characterization of Corrosion Products from the New Alloys Zn-RE Khadoudj Guessoum1, D.Veys-Renaux2, E. Rocca3, K. Belhamel4. 1.4.
Département de Génie des Procédés, Faculté de Technologie, Université de Béjaia, Béjaia 06000, Algérie Institut Jean Lamour-UMR CNRS 7198, Université de Lorraine-CNRS, Vandoeuvre-lès-Nancy 54506, France
[email protected] [email protected]
2.3.
Abstract: New Zn-REalloys (RE=Ce, La) were synthesized by melting under controlled atmosphere and cast in plates. The electrochemical behaviour of these new alloys was investigated in a reference corrosive medium. In the specific case of cerium addition to zinc, an anodic inhibition was also observed and correlated with a chemical modification of the corrosion products. From results of controlled precipitation experiments of cerium and zinc salts performed in carbonated medium, the presence of cerium in the corrosion layer and its protective character could be attributed to the formation of a mixed double lamellar zinc-cerium product.
Key words:Zinc, Rare Earth, thermalsynthesis, microstructuralcharacterization, corrosion, sacrificial anodes, corrosion product...
RAM 2016
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A first-principles study of half-metallicity and magnetic properties of full-HeusleralloysZr2CrX (X = Ga, In) S. Gheriballah*, A. Chahed*, A. Amar*, H. Rozale*, A. Lakdja* and A. Sayede** *
Condensed Matter and sustainable development Laboratory (LMCDD), University of Sidi Bel-Abbes, Sidi Bel-Abbes 22000, Algeria
[email protected] [email protected] [email protected] [email protected] [email protected]
**
UCCS, CNRS-UMR 8181, Université d’Artois, Faculté des Sciences Jean Perrin, Rue Jean Souvraz, SP 18, 62307 Lens Cedex, France
[email protected]
Abstract: First-principles calculations based on density functional theory with in the generalized gradient approximation (GGA) were performed in order to study magnetic moments, density of states and half-metallicity of full-Heusler alloys with formula Zr2CrX (X = Ga, In). Half-metallicity in terms of totalspin-moments was discussed since perfect half-metals show Slater–Pauling (SP) behavior. The effectsof the atomic number on the lattice constants, the bulk moduli and the Curie temperature were shown.The equilibrium lattice constants are 6.635and 6.875 Åfor Zr2CrGa and Zr2CrIn, respectively. Under compression and expansion deformations within lattice constant ranges of 6.515–7.100 and 6.371–7.126Å for Zr2CrG aand Zr2CrIn, respectively, the Zr2CrX (X= Ga, In) maintain ahalf-metallic nature with a fixedtotalmagneticmomentof -1μB/f.u., following the Slater–Pauling ruleμt= Zt- 18, but the absolute values of the local magnetic moments on Zr and Cr atoms increase with increasing lattice constant.
Keywords: Density functional theory; Full-Heusler compounds; Half-metallic ferromagnetic; Magnetism
RAM 2016
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Acceptor/Donor end capped phenylene-thiophene cooligomers toward efficiencies organic electronic devices A. Hlel, S. Ghomrasni, K. Alimi Unité de Recherche, Matériaux Nouveaux et Dispositifs Electroniques Organiques(UR11ES55), Faculté des Sciences, Université de Monastir, Tunisie.
[email protected] [email protected] [email protected]
Abstract: In this work we demonstrate that the density functional theory (DFT) based on the B3LYP and CAM –B3LYP functional with 6-31G(d,p) basis set canpredict a variety of oligomers or polymers to be used as an active layer in organic electronic devices. In this context, we have exploited this theory to study the geometries, electronic structures and optical properties of thiophene-phenylene co-oligomers. In fact, based on theoretical calculations the effect of the terminal acceptor/donor (CN, NO2, and CF3) /OCH3, N(CH3)2 substituents as well as the charge transporting processon thiophene-phenylene derivative are highlighted. Furthermore, the absorption spectra, LUMOandHOMO energy levelshave been computedin the presence or not of solvent at PCM modelin chloroform. Thus, from DFT we have deduced that these co-oligomers are good candidates for optoelectronic devices. Key words:thiophene-phenylene, DFT, CAM–B3LYP, B3LYP.
RAM 2016
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First-principles study of structural, elastic, thermodynamic, electronic and magnetic properties for the quaternary Heusler alloys CoRuFeZ (Z = Si, Ge, Sn) A. Chahed*, A. Amar*, H. Rozale*, A. Lakdja* and A. Sayede** *
Condensed Matter and sustainable development Laboratory (LMCDD), University of Sidi Bel-Abbes, Sidi Bel-Abbes 22000, Algeria
[email protected] [email protected] [email protected] [email protected] ** UCCS, CNRS-UMR 8181, Université d’Artois, Faculté des Sciences Jean Perrin, Rue Jean Souvraz, SP 18, 62307 Lens Cedex, France
[email protected]
Abstract: The electronic structure and magnetic properties of CoRuFeZ (Z= Si, Ge, and Sn) quaternary Heusler compounds were investigated using the full-potential linearized augmented plane wave (FPLAPW) method in framework of the density functional theory (DFT). The results showed that CoRuFeZ (Z= Si, Ge, and Sn) compounds were stable in Y-type1 structure. By use the GGA-mBJ, the CoRuFeGe and CoRuFeSn compounds were true half-metallic (HM) ferromagnets. The CoRuFeSi had a nearly HM characteristic. The minority band gaps were 0.557 eV, 0.444 eV and 0.428 eV for CoRuFeSi, CoRuFeGe and CoRuFeSn, respectively. The total magnetic moments of CoRuFeGe and CoRuFeSn compounds were obtained 5μB per formula unit, which were in agreement with Slater-Pauling rule Mtot = (Ztot -24). CoFeTiSi alloy can transform from a nearly half-metallic to a half-metallic alloy by employing a little expansion stress (+1.725 % relatively to the equilibrium lattice constant a0). The half-metalliciy characteristic exists in relatively wide ranges of 5.9 - 6.9 Å, 5.825 - 6.063 Å and 5.921 - 7.187 Å for CoRuFeSi, CoRuFeGe and CoRuFeSn compounds, respectively, which makes them promising candidates in spintronics. Keywords:Density functional theory; Quaternary Heusler compounds; Half-metallic ferromagnetic; Magnetism; Elastic constants; Thermodynamic properties.
RAM 2016
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Magnetic and magnetocaloric properties of nano-sized La0.8Ca0.8Mn1-xFexO3 manganites prepared by sol–gel method D. Fatnassi*, K. Sbissi*, E. K. Hlil**, M. Ellouze* and F. El Halouani*** * Faculty of Sciences of Sfax, Sfax University, BP 1171-3000, Sfax, Tunisia
[email protected] [email protected] **
Institute Neel, CNRS andUniversity Joseph Fourier, BP 166, 38042 Grenoble Cedex 9, France
[email protected]
***National Engineering School of Sfax, BP W, 3038 Sfax, Tunisia
[email protected]
Abstract: We present an investigation on magnetic and magnetocaloric properties of nano-sized La0.8Ca0.2Mn1-xFexO3(x = 0, 0.01, 0.15, 0.2) manganites synthesized by sol–gel process. X-ray diffraction and magnetization measurements were performed to investigate both crystal-lographic structure and magnetocaloric properties,respectively. All samples show an orthorhombic structurewithPnma space group. Ferromagnetic–paramagnetic transitionsensitive to iron doping is observed at Curie temperature(TC) ranging from 223 K (x = 0) to 70 K (x = 0.2). Inaddition, a large magnetocaloric effect near TC is observed.Under a magnetic field change of 5 T, a maximum 𝑚𝑚𝑚𝑚𝑚𝑚 ofmagnetic entropy∆𝑆𝑆𝑀𝑀 reaches 4.42, 4.32, 1.6, and0.54 J kg-1K-1, for x = 0, x = 0.01, x = 0.15,
andx = 0.2, respectively.The relative cooling power (RCP)values were computed as well. RCP values of 164 and117J kg-1 were found for La0.8Ca0.2MnO3(LCM) andLa0.8Ca0.2Mn0.99Fe0.01O3
(LCMFe0.01), respectively. The large values of entropy changes and related RCP allowconcluding that our material could be a highly attractivecandidate for magnetic refrigeration. Key words:Manganites, Magnetocaloric effect, Pechini sol–gel, Relative cooling power (RCP).
RAM 2016
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Effect of the structural parameters onsubbands offibonacci AlxGa1-xAs/GaAs superlattices Y. Sefir*, Z. Aziz **, S.Bentata *, S.Cherid, Z.F. Meghoufel, S. Terkhi, B. Bouadjemi. A. Zitouni and F. Bendahama Laboratoire de Technologie et des Propriétés du solide, Université Abdelhamid Ibn Badis, BP 227,27000 Mostaganem, Algérie (*)E-mail :
[email protected] (*)E-mail :
[email protected] (**)E-mail :
[email protected]
Abstract: This work is to study theeffect of the variation of structural parameters on the band structure in the quasiperiodic Fibonacci superlattices AlxGa1-xAs/GaAs using the formalism of the transfer matrix and Airy functions. Ours results show that increasing the width of Fibonacci’s wells af allows to the confinement of subminibands with a widening of minigaps, this causes a consistent and coherent fragmentation. The barrier thickness of Fibonacci bf acts on thewidth of subminibands by controlling the interaction force between neighboring eigenstates. Its increase gives rise to singularly extended states. The barrier height Fibonacci Vf permitto control the degree of structural disorder in these structures. The variation of these parameters permits the design of laser with modulated wavelength.
Keywords:Laser with modulated wavelength– Quasiperiodic superlattices- Singularly localized and extended states- Structural parameters- Transmission coefficient
RAM 2016
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Étude DFT: Calcul des constantes de vitesse des équilibres tautomères du médicament "IMEXON" N. MASSOUT, D. KHEFFACHE, O. OUAMERALI Ecole Doctorale Physique Chimie Théorique Chimie Informatique Faculté de chimie USTHB, BP 32 El Alia Bab Ezzouar, Alger
[email protected] [email protected] [email protected]
Abstract: Le 4-imino-1,3-diazabicyclo[3,1,0]-hexan-2-one est un membre de la classe des dérivées aziridines actif contre une variété de tumeur, plus connu dans le milieu médical sous le nom d’imexon[1]. L’étude de la cinétique des processus de tautomérisation est très importante puisqu’elle nous permet de reconnaître l'ampleur, en temps réel, de la tautomérie des médicaments à différentes conditions de température. Etant donné que la tautomérie est capable d’affecter l’activitéchimiques et biologiques des médicaments, en particulier la diversité de leurspropriétés pharmacologiques, il est donc très important de connaître ces équilibres tautomères etles chemins réactionnelles mis en jeu. O
O H N
N C
N
N C
H H N
H
H Oxo-amino
O
H
C H
N N
C N
H Oxo-imino
N
H
Hydroxyl-imino
Figure 1: Les trois formes tautomères du médicament imexon identifiées expérimentalement [3,4]. Une étude mécanistique détaillée réalisée à l’aide de la théorie de la fonctionnelle de la densité DFT et la théorie de l’état de transition TST pour une meilleure compréhension de la cinétique chimique du processus tautomérisation présent dans le médicament imexon. Key words:DFT;TST; Imexon; Tautomérie.
RAM 2016
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Heterocyclic Nonlinear Optical Chromophores Composed of Dicyanoimidazole Yousfi Noureddine*, El Horri M.A.**, Zouaoui Rabah M.*, M. Sekkal-Rahal* Faculty of Science, L2MSM Laboratory, University Djillali Liabes of Sidi Bel Abbes, B.P.89, Sidi Bel Abbès, 22000, ALGERIA
[email protected] [email protected] [email protected] [email protected]
Abstract: Heterocyclic chemistry has a wide variety of chemical compounds interest, biological, pharmacological, industrial, cosmetic and agricultural. Heterocyclic molecules containing a nitrogen atom are among the elements present in the field of medicinal chemistry. Thus, heterocyclic chemistry has become the focus of a large community of experimenters and theorists chemists. We carried out a theoretical study, by the quantum methods, on some heterocyclic molecules for better knowing their effectiveness in the field of non-linearoptics (ONL). The comparison between our results and the experimental parameters allowed us to determine the method which gives the parameters closest to the experimental data, and to understand the mechanisms involved. The studied system is the molecule 4-5dicyanoimidazole modified: firstly, by grafting the donor N(CH3)2 in the molecule 4-5dicyanoimidazole (compound1C) and secondly, by grafting the molecule of benzene in our basic system (compound2C). We have used the density functional theory DFT with different functional, namely: B-LYP, M06-L, TPSSH, O3-LYP, B3-LYP, PBE1PBE, BMK, BHH-LYP, M06-2X, CAM- B3LYP, M06HF. In addition, calculations with post Hartree-Fock method MP2; were made using the aug-ccpvdz basis set to calculate the following parameters: energy gaps, maximum wavelength λmax and absorption energies EABS by the IEF-PCM method with two solvents that are Dichlométhane and acetonitrile. Key words:Heterocyclic, ONL, IEF-PCM, MP2, DFT, TD-DFT, TCI, NBO.
RAM 2016
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Magnetocaloric and Critical behavior in the La0.6Ca0.30.1MnO3 manganese oxide I. Walha 1*, E. K. Hlil2** and E. Dhahri3* *
Laboratoirede Physique Appliquée, Faculté des Sciences, B.P. 1171, 3000 Sfax, Université de Sfax, Tunisie
[email protected] **2
Institut Néel, CNRS – Université J. Fourier, BP 166, 38042 Grenoble, France
Abstract: The La0.6Ca0.30.1MnO3 compound has been elaborated using the conventional ceramic method at 1200 °C. X-ray diffraction patterns showed that our synthesized sample is single phase and crystallize in the orthorhombic system with Pnma space group using the solid-state reaction at high temperature. Magnetization measurements versus temperature in a magnetic applied field of 50mT showed that our sample is ferromagnetic at low temperature.The critical properties of perovskite at the ferromagnetic–paramagnetic transition have been analyzed. Experimental results revealed that our sample exhibit a second-order magnetic phase transition. The estimated critical exponents derived from the magnetic data using various techniques such as modified Arrott plot, Kouvel– Fisher method, and critical magnetization isotherms M (TC, H). The critical exponent values for the undoped compound were found to match well with those predicted for the three-dimensional Ising model. The magnetic phase transition and the magnetic entropy change (-∆Sm) in La0.6Ca0.30.1MnO3 manganite is investigated by measuring the magnetization as a function of temperature. The maximummagnetic entropy change (-∆Sm) and the relative cooling power (RCP) are found to be, respectively, 5.32J kg_1 K_1 and 240 J kg_1 for a 5-T field change, making of this material a promising candidate formagnetic refrigeration near room temperature. Key words:Powder diffraction, critical phenomena, magnetic properties, phase transitions.
RAM 2016
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Nanostructured Fe Powders: Structure and Thermal Properties Hayet Moumeni*, **, Abderrafik Nemamcha**, Jean Luc Rehspringer*** *
Département des Sciences de la Matière, Faculté des Mathématique et Informatique et Sciences de la Matière, Université 8 Mai 1945- Guelma, Algérie.
[email protected],
ou
[email protected]
**
Equipe : Nanostructures, surfaces et interfaces, Laboratoire d’Analyses Industrielles et Génies des Matériaux, Département de Génie des Procédés, Faculté de Sciences et de la Technologie, Université 8 Mai 1945-Guelma, Guelma, Algérie.
[email protected], ***
ou
[email protected]
Département de Chimie des Matériaux Inorganiques, Institut de Physique et Chimie des Matériaux de Strasbourg, UMR7504 CNRS - Université de Strasbourg, France.
[email protected]
Abstract: NanocrystallineMagnetic alloys have been greatly studied in the last decades and receive significant attention according to their exceptional magnetic properties and potential technological applications in magnetic devices. Mechanical alloying is nowadays one of the widely used preparation techniques to obtain nanocrystalline structures. This technique involves the synthesis of materials by high-energy ball milling, in which elemental blends (or prealloyed powders) are milled to achieve nanostructured alloys or composite materials. The work described here focuses principally on a detailed study of the structural, microstructural and thermal properties of nanostructured Fe powders prepared by high energy ball milling by means of X-ray diffraction (XRD) and DSC techniques. Rietveld analysis of XRD patterns reveals the decrease of crystallite size down to nanometer scale and the increase of internal level strains and dislocations density. The progress of milling process is accompanied by an increase of lattice parameter and the Debye-Waller factor revealing the Fe lattice distortion. DSC thermograms exhibit a broad exothermic peak mainly attributed to grain growth and strain relaxation. An increase of stored enthalpy corresponding to the defects recovery has been observed with increasing milling time. Key words: Nanostructured materials, Fe powder, Rietvels analysis, thermal properties, DSC, XRD.
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Production of Palladium Nanoparticles/Silica Nanocomposite for Water Purification Abderrafik Nemamcha*, Hayet Moumeni*, Jean Luc Rehspringer** *
Equipe : Nanostructures, surfaces et interfaces, Laboratoire d’Analyses Industrielles et Génies des Matériaux, Département de Génie des Procédés, Faculté de Sciences et de la Technologie, Université 8 Mai 1945-Guelma, B.P. 401, Guelma 24000, Algérie.
[email protected], ou
[email protected], ou **
[email protected] [email protected]
Département de Chimie des Matériaux Inorganiques, Institut de Physique et Chimie des Matériaux de Strasbourg, UMR7504 CNRS - Université de Strasbourg, France.
[email protected]
Abstract: Recently, nanoparticles and nanomembrane are well used for detection and removal of chemical substances in water. Nanomembranes reveal a good result than other techniques used in water purification because of its high surface area and high catalytic activity.
In this work, Palladium nanoparticles (Pdns) have been successfully encapsulated in the mesoporousceramic host, at room temperature, on two steps: (i) preparation of palladium nanoparticles suspension by sonochemical reduction of Pd(II) nitrate and (ii) elaboration of the composite material (ceramic +Pdns).
Pdns formation (particle size of about 2 nm) has been
investigated using UV-Visible spectroscopy, EDX and transmission electron microscopy (TEM). The textural results, obtained by SEM and mercury porosimetry on elaborate composite (ceramic membranes) confirm the influence of the introduction of the Pdns suspension. It appears that the presence of the nanoparticle stabilizer agent, PVP, combined with organic compounds, leads to the formation of high porous ceramic host with a sharply narrow pore size distribution around 20 nm, high total porosity 55 % and a low bulk density. According to the above results, the obtained material can be used for water nanofiltration.
Keywords: Nanostructured membranes, Palladium nanoparticles, Sonochemistry, UV-Vis spectroscopy, TEM, SEM, Mercury porosimetry.
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Propagation of Bleustein-Gulyaev Waves in Piezoelectric BST Layered Structures Souhir Mseddi 1*and Mohamed Hédi Ben Ghozlen**
[email protected] [email protected]
Abstract: Layered structures, especially thin film/coating substrate system play important roles in micro-electro-mechanical system and microelectronics packages.Surface electro-acoustic waves (Bleustein-Gulyaev waves) have very practical importance in many signal transmission, signal processing and information storage applications. Theoretical analysis of Bleustein–Gulyaev surface acoustic wave propagation in a layered piezoelectric structure is described. Numerical calculations are performed on BaxSr1-xTiO3 with x= (0.8, 0.9, 1) for the case that the layer and the substrate are identical except that they are polarized in opposite directions. The purpose of this study is to obtain and clarify the various mechanical material parameters of BaxSr1-xTiO3 as a function of composition. The behavior of the ratio x= (0.8, 0.9, 1) in BaxSr1-xTiO3 was investigated to understand its impact on the electromechanical coupling coefficient. The adopted numerical approach is based on the Ordinary Differential Equation (ODE) and Stiffness Matrix Method (SMM). Dispersive behaviors of BG type waves propagating were discussed. Electromechanical coupling coefficient (K2) is investigated for GHz-band applications. Obviously large impact of the Sr ratio of BaxSr1-xTiO3 was found on the coupling coefficients (K2). Key words:BG waves, piezoelectric BST films, ODE, SMM.
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The effect of the addition of ground olive stones on the physical and mechanical properties of clay bricks Chelouah Nasser 1*, Arezki Samia 2** and Tahakourt Abdelkader 3*
[email protected] [email protected] [email protected]
Abstract: This study deals with the effect of ground olive stones (GOS) on the performance of fired clay bricks. Seven different clay-GOS mixes with 0, 1, 2, 3, 4, 5 and 10 wt % of GOS respectively were used for making fired brick samples. All samples were fired at 900 °C. The technological properties of the resultant material were then determined, including shrinkage, apparent density, pore size distribution, thermal conductivity, water absorption, and compressive and flexural strength. The addition of GOS to the mixture reduced the compressive strength of fired clay bricks. All clay brick pieces exhibited low firing shrinkage. It was apparent that as the percentage of GOS increased in the body, there was a noticeable increase in porosity. The water absorption coefficient decreased with increasing additions. The results indicated that thermal conductivity decreases with decrease in density and increase in porosity in fired clay bricks.
Keywords Brick; Organic material; Temperature; Compressive strength; Thermal Analysis
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Origin of indirect optical transitions in Al0.45In0.55As/Al0.66Ga0.34As quantum dots I. Saïdi*, R. Neffati, S. Ben Radhia and K. Boujdaria** *
**
[email protected] [email protected]
Abstract: Due to their distinguished opto-electronic properties, type-II quantum dots (QDs) have attracted considerable attention over the last few years. Since they show optical properties quite different from those of type-I QDs, such as long radiative lifetime [1] d dot-shape-dependent oscillator strength [2] and large tunability of emitted photon.The published reports on optical properties of the system of AlInAs QDs embedded in an AlGaAs matrix are still rather limited. In order to understand the optical properties of systems type- II, we need to establish the electronic structure of AlInAs/AlGaAs QDs, which has been scarcely studied up to now. Thus, a more adequate calculation explaining band alignment of such structures and its optical transition is required (Figure). So we can us to interpret the QD emission originating from indirect type-II transitions involving electrons in X valley of Al0.66Ga0.34As and heavy holes (HH), with S and P symmetry, in Al0.45In0.55As QDs. In this work, we report the photoluminescence excitation measurements of Al0.45In0.55As /Al0.45In0.55As type II QDs. Given that the numerical modelingof optical properties of such structure is still lacking, we also present simulations of indirect optical transitions in real and reciprocal spaces jointly to our PEL study.
Key words:Quantum dots, photoluminescence, type II, indirect transition References:[1] U. E. H. Laheld, F. B. Pederson, and P. C. Hemmer, Phys. Rev. B 52, 2697 (1995). [2] Sun, G. Wang, J. E. Bowers, and M. H. Pilkuhn, Appl. Phys. Lett. 68, 1543(1996).
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Corrosion behaviour of dc magnetron sputtered aluminium coatings M. Bahroune *, A. Mosbah** and A. Saker** Department of CPST, National and Superior School of Mines, Annaba, Algeria
[email protected]
Department of physique, Badji-Mokhtar university, Annaba, Algeria
[email protected] [email protected]
Abstract: Protection of steel parts from corrosion is of ground importance for the industry as mechanical resistance is to be maintained. Corrosion protection by metal coatings using wet processes is still widely applied. However, such processes are not environmentally friendly because of the required disposal of heavy metal containing effluents. This is particularly true for hard chromium plating. Physical vapour deposition (PVD) offers a good alternative to replace the electrolytic deposits of hard chromium. For that purpose, base aluminium coatings (Al-M) were deposited by d.c magnetron sputtering and investigate in order to answer the mechanical and physico-chemical requirements. The objective of this study is to elaborate architecture multilayers nanostructured with base aluminium coatings. First of all, we elaborated and characterized the binary layers on base of Aluminium (Al-M: M = Mo, Mn and Mg). Afterward, classification by mean corrosion resistance, are done for finding the potential candidates as a sacrificial anode for steels of construction.
Key words: Cathode sputtering magnetron, thin films, nanostructure, corrosion, aluminium alloys.
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Control of the Wind Power Generationusing Doubly Fed Induction Generators Y. BELKACEM*, S. DRID*, A. MAKOUF*, L. CHRIFI-ALAOUI**, M. OURIAGLI*** *
Université de Batna 2, Laboratoire LSPIE-2000, Avenue Chahid Med Boukhlouf, 05000 Batna, Algérie.
[email protected],
[email protected],
[email protected]
**
Université de Picardie Jules Verne, Laboratoire LTI (EA, 3899), 13 AV. F. Mitterrand, 02880 Cuffies, France.
[email protected] ***
Université Sidi Mohammed Ben Abdellah, Laboratoire des Sciences de l’Ingénieur (LSI), Faculté polydisciplinaire de Taza Route d’Oujda, B.P :1223 Taza Maroc.
[email protected]
Abstract: This work deals with the control of the wind energy conversion system (WECS) equipped with two doubly-fed induction generators (DFIG). The main generator is controlled in order to keep the voltage and the frequency in the rates values. The second generator is connected when the power demand increase. But, before the connection, with the first generator, synchronization is done. After that, the system is switched on the power control. All controllers are designed using the Lyapunov theory. The simulation results confirm widely the feasibility and the effectiveness of the proposed control.
Key words:Wind Energy Conversion System, Doubly–Fed Induction Generator, Wound Rotor, Isolated Grid, Lyapunov Function.
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Influences Of Anisotropy On Band Gaps Of 2d Phononic Crystal With Hexagonal Inclusions Mohamed Hédi BEN GHOZLEN and Hassiba KETATA LPM, FSS B.P. 1171 C.P. 3000, SFAX (TUNISIA)
Abstract: The existence of gaps close to the audible frequency range makes phononic materials extremely coveted, and their scope is expanding. In this context we deal with the band gaps related to a two-dimensional phononic system. This composite is made of anisotropic cylindrical fillers incorporated in an isotropic matrix. The plane wave expansion method (PWE) is used to reduce the band structure problem to an eigen value problem. Such approach can be generalized to different types of symmetry and permit new physical properties as piezoelectricity to be added. Two types of periodic structures, namely, the square lattice and the triangular lattice are examined. For a hexagonal material implantation in phononic crystal, the band gap depends not only on periodic array but also on the angle between the symmetry axis (sixfold axis) and that of the periodic structure. Altering the angle, by rotation of the cylinder, pass bands and forbidden bands of the phononic crystal are changed. For illustration the numerical calculation is applied for the analysis of the dynamic behavior of several composites. The localization and width of band gaps are estimated for different implantation factor for different rotation angles and for several geometric shapes.
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Ruthenium(II) diamine complexes incorporating azoimine ancillary ligands. Synthesis, spectral, crystal structure and DFT calculations and catalytic activity in the hydrogenation of α,β-unsaturated aldehyde Mousa Al-Noaimia, Ayman Hammoudehb a
Department of Chemistry, Hashemite University, P.O.Box 150459, Zarqa-13115-Jordan
[email protected] b Depatment of Chemistry, Yarmouk University, Irbid, Jordan.
[email protected] Abstract: Six ruthenium complexes bearing phenylazo-(2-(phenylalkyl))phenylmethine ligands of the general type [RuII(bpy)(L)(Cl)2]PF6 (C1-C6) {L = (2-SR)C6H4N=NC(COCH3)=NC6H4X, L1, C1, X = H, R = Ph; L2, C2, X = CH3, R = Ph; L3, C3, X = F, R = Ph; L4, C4, X = NO2, R=Ph; L5, C5, X = H, R=CH3; L6, C6, X = H, R=H} and [RuII(phen)(L1)(Cl)]PF6 (C7) have been synthesized. The crystal structures for C1 is reported and show that the ligands are bind to ruthenium centres as NN'S tridentate ligands. Furthermore, these complexes have been characterized through spectroscopic (IR, UV/Vis. and NMR) and electrochemical (CV) techniques. The redox properties and electronic excitations in the complex are interpreted by DFT and TDDFT calculations. Key words: azoimine, ruthenium , X-ray , DFT calculations
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Extraction and characterization of cellulose microfibrils obtained from agricultural residues (Wood flour) Rim BAATI1, Albert MAGNIN², Sami BOUFI1,
Corresponding author:
[email protected] 1
Materials and Environmental Sciences Laboratory, University of Sfax, Faculty of Science, Tunisia 2
Rheology and processes laboratory, UJF Grenoble 1, Grenoble-INP, UMR CNRS Grenoble, France
Abstract:
In recent years, nanofibrillated cellulose is a growing interest both in the academic and industrial level thanks to the favorable properties it possesses. In the present work, nanofibrillated cellulose from wood flour was produced and their properties and morphological features fully characterized. The yield of fibrillation of NFC fractions, at different extrusion time, was evaluated by centrifugation and the reinforcing power is by Dynamic Mechanical Analysis .The rheological proproties were performed using an ARES rheometer supplied TA Instruments working under controlled strain, and conducted in oscillatory mode using parallel plate geometry. The evolution of transparency degree was analysed by UV-visible transmittance. Pulps with the highest extrusion time showed higher yields of nanofibrillated fraction and a better aptitude of the individualization of the microfibrils. Keywords: Nanofibrillated cellulose,Wood flour, Extrusion, Yield of fibrillation.
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List of countries Country
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1
Algeria
2
Egypt
3
France
4
Germany
5
Jordan
6
Lebanon
7
Moldova
8
Morocco
9
Palestine
10
Poland
11
Russian Federation
12
Tunisia
13
UK
14
USA
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