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Auteur Wahiba Kaabar |
Documents disponibles écrits par cet auteur (5)
Affiner la recherche Interroger des sources externesEtude de l’adsorption des protéines à l’interface solide/liquide et des propriétés des membranes phospholipidiques supportées / Fairouz Dekkiche
Titre : Etude de l’adsorption des protéines à l’interface solide/liquide et des propriétés des membranes phospholipidiques supportées Type de document : texte imprimé Auteurs : Fairouz Dekkiche, Auteur ; Wahiba Kaabar, Directeur de thèse ; Jean-Paul Rieu, Directeur de thèse Editeur : Constantine : Université Mentouri Constantine Année de publication : 2011 Importance : 146 f. Format : 31 cm Note générale : Doctorat en sciences
2 copies imprimées disponiblesLangues : Français (fre) Catégories : Français - Anglais
ChimieTags : Microscopie à force atomique (AFM) Microscopie de Fluorescence Bicouches phospholipidiques Membranes cellulaires Adsorption Protéines Nanomécanique Biolubrification Ancres GPI. Index. décimale : 540 Chimie et sciences connexes Diplôme : Doctorat en sciences En ligne : ../theses/chimie/DEK6004.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=5911 Etude de l’adsorption des protéines à l’interface solide/liquide et des propriétés des membranes phospholipidiques supportées [texte imprimé] / Fairouz Dekkiche, Auteur ; Wahiba Kaabar, Directeur de thèse ; Jean-Paul Rieu, Directeur de thèse . - Constantine : Université Mentouri Constantine, 2011 . - 146 f. ; 31 cm.
Doctorat en sciences
2 copies imprimées disponibles
Langues : Français (fre)
Catégories : Français - Anglais
ChimieTags : Microscopie à force atomique (AFM) Microscopie de Fluorescence Bicouches phospholipidiques Membranes cellulaires Adsorption Protéines Nanomécanique Biolubrification Ancres GPI. Index. décimale : 540 Chimie et sciences connexes Diplôme : Doctorat en sciences En ligne : ../theses/chimie/DEK6004.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=5911 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité DEK/6004 DEK/6004 Thèse Bibliothèque principale Thèses Disponible
Titre : Modélisation numérique des processus physico-chimiques dans les milieux à haute température. Type de document : texte imprimé Auteurs : Razika Hadjadj ép. Assabaa, Auteur ; Wahiba Kaabar, Directeur de thèse Editeur : Constantine : Université Mentouri Constantine Année de publication : 2009 Importance : 94 f. Note générale : 01 Disponible à la salle de recherche 02 Disponibles au magazin de la B.U.C. 01 CD Langues : Français (fre) Catégories : Français - Anglais
ChimieTags : Chimie Analytique et Physique: Chimie physique Modélisation numérique Convection naturelle Transfert thermique Lampe à halogène Energie de Gibbs Numerical modeling halogen lamps heat transfer Gibbs energy natural convection نموذج عددي مصباح الهالوجين االنقل الحراري طاقةGibbs حمل حراري طبيعي Index. décimale : 540 Chimie et sciences connexes Résumé : The interior of an operating light source is a very hostile environment. In the familiar gas-filled incandescent lamps, large temperature gradients are present. The greatly different gas/solid boundary temperatures give rise to large temperature gradients in the near atmospheric pressure gas filling which, in turn, result in complex, buoyancy driven, recirculating flow patterns in the working gases. In this work a modeling investigation of an operating halogen lamp is described the halogen lamp was chosen to be the focus of the studies because it provided ready optical access to its axial, intra-coil regions, it allowed simple, accurate control of gas temperatures over a very wide range (300 K to more than 3,000 K) and the composition of its 5% HBr and 95% N2 cold-fill chemical dose responds in a significant and reversible manner to the changing conditions which result from changes in the filament temperature. High fidelity, Fluent 6 computational fluid dynamics (CFD) model of the lamp is created which included a sub-model to implement local Gibbs Energy minimization within the operating lamp. The finite volume method has been used to solve the equations of continuity, momentum (the Navier Stokes equations) and energy. The spatially precise knowledge of both physical conditions, and multispecies chemical composition, over a wide range of lamp operating conditions creates a unique and important opportunity to test and validate understanding of such complex systems through the use of computer based models. The model predictions were critically compared with the experimental measurements providing thereby many insights to lamp operation and guiding further modeling work. Amongst several important outcomes of the work is the observation of the effect of thermal diffusion on the relative concentration of Br atoms in the high temperature, intra-coil region. Diplôme : Magistère En ligne : ../theses/chimie/HAD5505.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=3771 Modélisation numérique des processus physico-chimiques dans les milieux à haute température. [texte imprimé] / Razika Hadjadj ép. Assabaa, Auteur ; Wahiba Kaabar, Directeur de thèse . - Constantine : Université Mentouri Constantine, 2009 . - 94 f.
01 Disponible à la salle de recherche 02 Disponibles au magazin de la B.U.C. 01 CD
Langues : Français (fre)
Catégories : Français - Anglais
ChimieTags : Chimie Analytique et Physique: Chimie physique Modélisation numérique Convection naturelle Transfert thermique Lampe à halogène Energie de Gibbs Numerical modeling halogen lamps heat transfer Gibbs energy natural convection نموذج عددي مصباح الهالوجين االنقل الحراري طاقةGibbs حمل حراري طبيعي Index. décimale : 540 Chimie et sciences connexes Résumé : The interior of an operating light source is a very hostile environment. In the familiar gas-filled incandescent lamps, large temperature gradients are present. The greatly different gas/solid boundary temperatures give rise to large temperature gradients in the near atmospheric pressure gas filling which, in turn, result in complex, buoyancy driven, recirculating flow patterns in the working gases. In this work a modeling investigation of an operating halogen lamp is described the halogen lamp was chosen to be the focus of the studies because it provided ready optical access to its axial, intra-coil regions, it allowed simple, accurate control of gas temperatures over a very wide range (300 K to more than 3,000 K) and the composition of its 5% HBr and 95% N2 cold-fill chemical dose responds in a significant and reversible manner to the changing conditions which result from changes in the filament temperature. High fidelity, Fluent 6 computational fluid dynamics (CFD) model of the lamp is created which included a sub-model to implement local Gibbs Energy minimization within the operating lamp. The finite volume method has been used to solve the equations of continuity, momentum (the Navier Stokes equations) and energy. The spatially precise knowledge of both physical conditions, and multispecies chemical composition, over a wide range of lamp operating conditions creates a unique and important opportunity to test and validate understanding of such complex systems through the use of computer based models. The model predictions were critically compared with the experimental measurements providing thereby many insights to lamp operation and guiding further modeling work. Amongst several important outcomes of the work is the observation of the effect of thermal diffusion on the relative concentration of Br atoms in the high temperature, intra-coil region. Diplôme : Magistère En ligne : ../theses/chimie/HAD5505.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=3771 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité HAD/5505 HAD/5505 Thèse Bibliothèque principale Thèses Disponible
Titre : Modélisation numérique tridimensionnelle des processus physico-chimiques dans une pile à combustible à membrane échangeuse de protons. Type de document : texte imprimé Auteurs : Razika Hadjadj ép. Assabaa, Auteur ; Wahiba Kaabar, Directeur de thèse Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2019 Importance : 176 f. Format : 30 cm. Note générale : 2 copies imprimées disponibles
Langues : Français (fre) Catégories : Français - Anglais
ChimieTags : Chimie: Chimie analytique et physique PEMFC CFD écoulement de fluide transfert de masse transfert de chaleur forme
des canaux humidité relative mass transfer heat transfer channels shape relative humidity خلیة وقود ذات غشاء نفوذ للبروتونات أشكال قنوات الغاز دینامیكیة الموائع الحسابیة نقل الكتلة نقل
الحرارة الرطوبة النسبیةIndex. décimale : 540 Chimie et sciences connexes Résumé :
In the current situation of global warming and depletion of oil reserves, the use of proton exchange membrane fuel cells (PEMFC) needs further improvements. In this work, two numerical 3D models have been developed; single-phasic and two-phase water transport coupled with heat transfer and electrochemical kinetics in a PEMFC with parallel, straight channels, characterized by three different shapes: rectangular, triangular and elliptical. The single-phase model describes the coupled transport of gaseous species in the electrodes of the cell and the transport of water in the membrane. The two-phase model considers liquid water in porous diffusers. The equations governing fluid and transfer phenomena vary between the continuous
medium in the gas channels and the porous medium in the diffusion and catalytic layers. The models are implemented into the commercial computational fluid dynamics (CFD) software package Fluent®6.3, with its user-defined functions (UDFs). The use of the models makes it possible to study the influence of the geometrical parameters and the impact of the cell potentiel and the humidification of the reactants on the performance of the cell. It is shown, on the basis of the monophasic model, that the geometry of the gas channels and the dimensions of the channel have a great influence on mass and heat transfer phenomena. The best performance is obtained for a triangular channel with 0.1 mm width. The performance of the cell can be greatly improved at low voltage and high relative humidity. The two-phase model indicates good hydration of the membrane at high current density. The liquid water saturation in the porous layer is the highest in the rectangular channel which generates a low current density. The simulations reveal that oxygen consumption at the catalytic surface is much lower in the two-phase model due to the accumulation of liquid water that blocks O2 access to the catalytic layer active sites. The consideration of the liquid water generates a lower limit current than in the monophasic case. In view of the results obtained, taking into account liquid water in the modelling of a PEMFC is essential. The geometrical and operating parameters in the different parts of an elementary cell affect greatly the performance of the fuel cell.Diplôme : Doctorat en sciences En ligne : ../theses/chimie/HAD7522.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=11362 Modélisation numérique tridimensionnelle des processus physico-chimiques dans une pile à combustible à membrane échangeuse de protons. [texte imprimé] / Razika Hadjadj ép. Assabaa, Auteur ; Wahiba Kaabar, Directeur de thèse . - جامعة الإخوة منتوري قسنطينة, 2019 . - 176 f. ; 30 cm.
2 copies imprimées disponibles
Langues : Français (fre)
Catégories : Français - Anglais
ChimieTags : Chimie: Chimie analytique et physique PEMFC CFD écoulement de fluide transfert de masse transfert de chaleur forme
des canaux humidité relative mass transfer heat transfer channels shape relative humidity خلیة وقود ذات غشاء نفوذ للبروتونات أشكال قنوات الغاز دینامیكیة الموائع الحسابیة نقل الكتلة نقل
الحرارة الرطوبة النسبیةIndex. décimale : 540 Chimie et sciences connexes Résumé :
In the current situation of global warming and depletion of oil reserves, the use of proton exchange membrane fuel cells (PEMFC) needs further improvements. In this work, two numerical 3D models have been developed; single-phasic and two-phase water transport coupled with heat transfer and electrochemical kinetics in a PEMFC with parallel, straight channels, characterized by three different shapes: rectangular, triangular and elliptical. The single-phase model describes the coupled transport of gaseous species in the electrodes of the cell and the transport of water in the membrane. The two-phase model considers liquid water in porous diffusers. The equations governing fluid and transfer phenomena vary between the continuous
medium in the gas channels and the porous medium in the diffusion and catalytic layers. The models are implemented into the commercial computational fluid dynamics (CFD) software package Fluent®6.3, with its user-defined functions (UDFs). The use of the models makes it possible to study the influence of the geometrical parameters and the impact of the cell potentiel and the humidification of the reactants on the performance of the cell. It is shown, on the basis of the monophasic model, that the geometry of the gas channels and the dimensions of the channel have a great influence on mass and heat transfer phenomena. The best performance is obtained for a triangular channel with 0.1 mm width. The performance of the cell can be greatly improved at low voltage and high relative humidity. The two-phase model indicates good hydration of the membrane at high current density. The liquid water saturation in the porous layer is the highest in the rectangular channel which generates a low current density. The simulations reveal that oxygen consumption at the catalytic surface is much lower in the two-phase model due to the accumulation of liquid water that blocks O2 access to the catalytic layer active sites. The consideration of the liquid water generates a lower limit current than in the monophasic case. In view of the results obtained, taking into account liquid water in the modelling of a PEMFC is essential. The geometrical and operating parameters in the different parts of an elementary cell affect greatly the performance of the fuel cell.Diplôme : Doctorat en sciences En ligne : ../theses/chimie/HAD7522.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=11362 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité HAD/7522 HAD/7522 Thèse Bibliothèque principale Thèses Disponible
Titre : Photodegradation of organic contaminants by photolysis and H2O2/UV processes : QSPR and kinetic modeling. Type de document : texte imprimé Auteurs : Nabila Djadi, Auteur ; Wahiba Kaabar, Directeur de thèse Mention d'édition : 29/12/2020 Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2020 Importance : 126 f. Format : 30 cm. Note générale : Doctorat 3éme CYCLE LMD.
1 copies imprimées disponibles
Langues : Anglais (eng) Catégories : Français - Anglais
ChimieTags : Chimie: Analytical Chemistry and Environment contaminants organiques procédé de photolyse directe procédé H2O2/UV modélisation cinétique modélisation QSPR organic contaminants direct photolysis process H2O2/UV process kinetic modeling QSPR modeling الملوثات العضوية عملية التحلل الضوئي المباشر عملية H2O2 / UVالنمذجة الحركية نمذجةQSP Index. décimale : 540 Chimie et sciences connexes Résumé :
Organic contaminants are an emerging concern in environmental sciences. The use of ultraviolet-initiated advanced oxidation processes (AOPs) is becoming an attractive alternative for the degradation of harmful organic contaminants that are not easily removed using conventional water treatment processes. Although several UV-initiated AOPs are available, the focus of the research undertaken in this thesis is the hydrogen peroxide-ultraviolet irradiation (H2O2/UV) process, in addition to direct photolysis. The main goal of this thesis is to develop kinetic models for the prediction of organic contaminants degradation and to elucidate the relevance of the computational predictive models that can be used to fill the lack of knowledge on photochemical properties for environmental issues. Quantitative structure property relationship (QSPR) models were used to predict the photochemical properties of organic compounds from their structures. These modeling techniques make use of existing experimental data to predict unknown chemical properties. The conceptual basis of QSPR models is that similar structures are expected to exhibit similar chemical properties. In this thesis computer simulations of combined QSPR and kinetic models were carried out to investigate the various photochemical parameters and the removal potential of organic contaminants. First a kinetic model, which predicts organic contaminants degradation by low-pressure UV irradiation in aqueous media, was developed and verified based on experimental results obtained from the literature. Pollutants with different chemical natures and belonging to various organic contaminant classes, including pharmaceuticals, pesticides and disinfection byproducts were selected as model compounds. The specific objective was to assess the predictive ability of the kinetic model with different organic contaminants and under various process and experimental conditions. The combined approach QSPR / kinetic modeling was then used to predict the photodegradation of commercially unavailable halogenated disinfection byproducts. Second a dynamic chemical kinetic model was developed to predict DBCP and Alachlor photodegradation by H2O2/UV process in aqueous media in a completely mixed batch reactor under various process and experimental conditions. The validated kinetic model was then combined with QSPR model to predict the photodegradation of p-Cresol by H2O2/UV process in aqueous media considering the formation and fate of its intermediate compounds. The validation of the combined approach was conducted by testing the prediction of the p-Cresol degradation under different initial concentrations of p-Cresol and H2O2. In this thesis, the stiff differential equations that describe the organic contaminants photodegradation were implemented and solved within the Matlab environment. QSPR models were constructed with QSARINS software by multiple linear regression and genetic algorithm analysis with the use of Dragon generated molecular descriptors and quantum descriptors performed with Gaussian software on the basis of density functional theory method.
Note de contenu :
Appendix.
Diplôme : Doctorat En ligne : ../theses/chimie/DJA7688.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=11522 Photodegradation of organic contaminants by photolysis and H2O2/UV processes : QSPR and kinetic modeling. [texte imprimé] / Nabila Djadi, Auteur ; Wahiba Kaabar, Directeur de thèse . - 29/12/2020 . - جامعة الإخوة منتوري قسنطينة, 2020 . - 126 f. ; 30 cm.
Doctorat 3éme CYCLE LMD.
1 copies imprimées disponibles
Langues : Anglais (eng)
Catégories : Français - Anglais
ChimieTags : Chimie: Analytical Chemistry and Environment contaminants organiques procédé de photolyse directe procédé H2O2/UV modélisation cinétique modélisation QSPR organic contaminants direct photolysis process H2O2/UV process kinetic modeling QSPR modeling الملوثات العضوية عملية التحلل الضوئي المباشر عملية H2O2 / UVالنمذجة الحركية نمذجةQSP Index. décimale : 540 Chimie et sciences connexes Résumé :
Organic contaminants are an emerging concern in environmental sciences. The use of ultraviolet-initiated advanced oxidation processes (AOPs) is becoming an attractive alternative for the degradation of harmful organic contaminants that are not easily removed using conventional water treatment processes. Although several UV-initiated AOPs are available, the focus of the research undertaken in this thesis is the hydrogen peroxide-ultraviolet irradiation (H2O2/UV) process, in addition to direct photolysis. The main goal of this thesis is to develop kinetic models for the prediction of organic contaminants degradation and to elucidate the relevance of the computational predictive models that can be used to fill the lack of knowledge on photochemical properties for environmental issues. Quantitative structure property relationship (QSPR) models were used to predict the photochemical properties of organic compounds from their structures. These modeling techniques make use of existing experimental data to predict unknown chemical properties. The conceptual basis of QSPR models is that similar structures are expected to exhibit similar chemical properties. In this thesis computer simulations of combined QSPR and kinetic models were carried out to investigate the various photochemical parameters and the removal potential of organic contaminants. First a kinetic model, which predicts organic contaminants degradation by low-pressure UV irradiation in aqueous media, was developed and verified based on experimental results obtained from the literature. Pollutants with different chemical natures and belonging to various organic contaminant classes, including pharmaceuticals, pesticides and disinfection byproducts were selected as model compounds. The specific objective was to assess the predictive ability of the kinetic model with different organic contaminants and under various process and experimental conditions. The combined approach QSPR / kinetic modeling was then used to predict the photodegradation of commercially unavailable halogenated disinfection byproducts. Second a dynamic chemical kinetic model was developed to predict DBCP and Alachlor photodegradation by H2O2/UV process in aqueous media in a completely mixed batch reactor under various process and experimental conditions. The validated kinetic model was then combined with QSPR model to predict the photodegradation of p-Cresol by H2O2/UV process in aqueous media considering the formation and fate of its intermediate compounds. The validation of the combined approach was conducted by testing the prediction of the p-Cresol degradation under different initial concentrations of p-Cresol and H2O2. In this thesis, the stiff differential equations that describe the organic contaminants photodegradation were implemented and solved within the Matlab environment. QSPR models were constructed with QSARINS software by multiple linear regression and genetic algorithm analysis with the use of Dragon generated molecular descriptors and quantum descriptors performed with Gaussian software on the basis of density functional theory method.
Note de contenu :
Appendix.
Diplôme : Doctorat En ligne : ../theses/chimie/DJA7688.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=11522 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité DJA/7688 DJA/7688 Thèse Bibliothèque principale Thèses Disponible
Titre : Simulation of signal generation volumes for non-linear laser spectroscopic techniques Type de document : texte imprimé Auteurs : Wahiba Kaabar ; University of Sheffield, Éditeur scientifique ; Robin Devonshire, Directeur de thèse Année de publication : 1991 Importance : 162 f. Note générale : 1 Disponible dans la salle de recherche Langues : Anglais (eng) Catégories : Français - Anglais
ChimieTags : Laser Chimie physique Index. décimale : 540 Chimie et sciences connexes Permalink : index.php?lvl=notice_display&id=4253 Simulation of signal generation volumes for non-linear laser spectroscopic techniques [texte imprimé] / Wahiba Kaabar ; University of Sheffield, Éditeur scientifique ; Robin Devonshire, Directeur de thèse . - 1991 . - 162 f.
1 Disponible dans la salle de recherche
Langues : Anglais (eng)
Catégories : Français - Anglais
ChimieTags : Laser Chimie physique Index. décimale : 540 Chimie et sciences connexes Permalink : index.php?lvl=notice_display&id=4253 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité KAA/2406 KAA/2406 Thèse Bibliothèque principale Thèses Disponible
