Titre :	Contribution à la commande adaptative robuste d’une classe de systèmes non linéaires.
Type de document :	texte imprimé
Auteurs :	Nassira Zerari, Auteur ; Mohamed Chemachema, Auteur
Editeur :	Constantine : Université Mentouri Constantine
Année de publication :	2019
Importance :	155 f.
Format :	30 cm.
Note générale :	1 copies imprimées disponibles
Langues :	Français (fre)
Tags :	Electronique:Contrôle des systèmes  Réseau de neurones  commande adaptative  systèmes non linéaires  saturation  zone-morte  fonction de Nussbaum  Neural networks (NNs)  adaptive control  nonlinear systems  dead-zone  Nussbaum function  ا  ل  ش  ب  ك  ة  ع  ص  ي  ت  ح  م  ؤ  أ  ن  ظ  خ  ط  ق  د  س  و
Index. décimale :	621 Electronique
Résumé :	The main objective of this thesis is the development of adaptive control laws for particular classes of uncertain SISO and MIMO nonlinear systems. The cases of the affine and non-affine systems, the presence of the constraints on the outputs and/or the states as well as the external perturbations are studied. Furthermore, the saturation and dead-zone inputs nonlinearities of the dynamical systems are investigated. In all the proposed approaches, the neural networks are used as universal approximators to estimate the unknown nonlinearities of the dynamical systems. The structures of the proposed controllers deal with the famous problems of explosion of complexity while avoiding the use of the traditional back-stepping technique. The proposed adaptive neural controllers have few online learning parameters compared to similar works. In addition, stability analysis of all control loops is carried out by using the Lyapunov method, and for each scheme, simulation results are given to show its effectiveness.
Diplôme :	Doctorat en sciences
En ligne :	../theses/electronique/ZER7603.pdf
Format de la ressource électronique :	pdf
Permalink :	https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=11038

Contribution à la commande adaptative robuste d’une classe de systèmes non linéaires. [texte imprimé] / Nassira Zerari, Auteur ; Mohamed Chemachema, Auteur . - Constantine : Université Mentouri Constantine, 2019 . - 155 f. ; 30 cm.
1 copies imprimées disponibles
Langues : Français (fre)

Tags :	Electronique:Contrôle des systèmes  Réseau de neurones  commande adaptative  systèmes non linéaires  saturation  zone-morte  fonction de Nussbaum  Neural networks (NNs)  adaptive control  nonlinear systems  dead-zone  Nussbaum function  ا  ل  ش  ب  ك  ة  ع  ص  ي  ت  ح  م  ؤ  أ  ن  ظ  خ  ط  ق  د  س  و
Index. décimale :	621 Electronique
Résumé :	The main objective of this thesis is the development of adaptive control laws for particular classes of uncertain SISO and MIMO nonlinear systems. The cases of the affine and non-affine systems, the presence of the constraints on the outputs and/or the states as well as the external perturbations are studied. Furthermore, the saturation and dead-zone inputs nonlinearities of the dynamical systems are investigated. In all the proposed approaches, the neural networks are used as universal approximators to estimate the unknown nonlinearities of the dynamical systems. The structures of the proposed controllers deal with the famous problems of explosion of complexity while avoiding the use of the traditional back-stepping technique. The proposed adaptive neural controllers have few online learning parameters compared to similar works. In addition, stability analysis of all control loops is carried out by using the Lyapunov method, and for each scheme, simulation results are given to show its effectiveness.
Diplôme :	Doctorat en sciences
En ligne :	../theses/electronique/ZER7603.pdf
Format de la ressource électronique :	pdf
Permalink :	https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=11038

Titre :	Biodiversité des microarthropodes litéricoles (Hexapoda; Collembola) de quelques localités du Nord-Est algérien.
Type de document :	texte imprimé
Auteurs :	Mohamed Bendjaballah, Auteur ; Salah Hamra-Kroua, Auteur
Editeur :	Constantine : Université Mentouri Constantine
Année de publication :	2019
Langues :	Français (moyen) (frm)
Tags :	Biotechnologie  Biologie et Environnement  Biodiversité et Ecologie des Arthropodes  Biodiversité  faunistique  Collemboles  Nord-Est algérien  Biodiversity
Index. décimale :	570 Sciences de la vie. Biologie
Résumé :	The prospection of eight (08) localities of the North-East of Algeria belonging to three bioclimatic stages allows us to carry out a series of samplings in the edaphic environments. Samples analyzed at the laboratory of Biosystematics and arthropods ecology. The fauna encountered is composed of 89 species belonging to the four orders of known Collembola, to 17 families and 51 genera. The predominance of the Poduromorpha order with 43 species constitutes a remarkable character of this fauna. 24 species are reported here for the first time in Algeria including Isotomurus sp., Proisotoma sp. and Pseudosinella sp. 1, all three harvested at Collo, are new to Science and are being described. Among the eight localities surveyed, it is from the Collo forest that most of the species harvested and identified are found, ie 72 species. The richness of the Neanuridae massif is much greater than that of most other Mediterranean regions (excluding Corsica) sampled significantly. Diversity indices indicate that Oued Z'hor is the richest station among the four stations surveyed at Collo. Another major interest of this faunistic study is the discovery of biogeographically unexpected taxa, in particular Sensillanura austriaca with its unusual ""Collo - Northern Alps"" disjunction model. A common species in our samples that can be new has been described and drawn. This description revealed that the species may be related to the species Heteromurus tetrophthalmus Börner, 1903 of Sicily, insufficiently described and considered for more than 30 years as a synonym of H. nitidus Templeton, 1836. Today, this work makes the Collo Massif one of the richest sites in Algeria for the diversity of its fauna. It also illustrates the extent of geographical gaps in the knowledge of this Algerian fauna.
Diplôme :	Doctorat
En ligne :	../theses/biologie/BEN7451.pdf
Format de la ressource électronique :	pdf
Permalink :	https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=11037

Biodiversité des microarthropodes litéricoles (Hexapoda; Collembola) de quelques localités du Nord-Est algérien. [texte imprimé] / Mohamed Bendjaballah, Auteur ; Salah Hamra-Kroua, Auteur . - Constantine : Université Mentouri Constantine, 2019.
Langues : Français (moyen) (frm)

Tags :	Biotechnologie  Biologie et Environnement  Biodiversité et Ecologie des Arthropodes  Biodiversité  faunistique  Collemboles  Nord-Est algérien  Biodiversity
Index. décimale :	570 Sciences de la vie. Biologie
Résumé :	The prospection of eight (08) localities of the North-East of Algeria belonging to three bioclimatic stages allows us to carry out a series of samplings in the edaphic environments. Samples analyzed at the laboratory of Biosystematics and arthropods ecology. The fauna encountered is composed of 89 species belonging to the four orders of known Collembola, to 17 families and 51 genera. The predominance of the Poduromorpha order with 43 species constitutes a remarkable character of this fauna. 24 species are reported here for the first time in Algeria including Isotomurus sp., Proisotoma sp. and Pseudosinella sp. 1, all three harvested at Collo, are new to Science and are being described. Among the eight localities surveyed, it is from the Collo forest that most of the species harvested and identified are found, ie 72 species. The richness of the Neanuridae massif is much greater than that of most other Mediterranean regions (excluding Corsica) sampled significantly. Diversity indices indicate that Oued Z'hor is the richest station among the four stations surveyed at Collo. Another major interest of this faunistic study is the discovery of biogeographically unexpected taxa, in particular Sensillanura austriaca with its unusual ""Collo - Northern Alps"" disjunction model. A common species in our samples that can be new has been described and drawn. This description revealed that the species may be related to the species Heteromurus tetrophthalmus Börner, 1903 of Sicily, insufficiently described and considered for more than 30 years as a synonym of H. nitidus Templeton, 1836. Today, this work makes the Collo Massif one of the richest sites in Algeria for the diversity of its fauna. It also illustrates the extent of geographical gaps in the knowledge of this Algerian fauna.
Diplôme :	Doctorat
En ligne :	../theses/biologie/BEN7451.pdf
Format de la ressource électronique :	pdf
Permalink :	https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=11037

Titre :	Etude des propriétés physiques dans les cristaux magnéto photoniques
Type de document :	texte imprimé
Auteurs :	Rachid Deghdak, Auteur ; Mouhamed Bouchemat, Directeur de thèse
Editeur :	جامعة الإخوة منتوري قسنطينة
Année de publication :	2018
Importance :	130 f.
Format :	30 cm.
Note générale :	2 copies imprimées disponibles
Langues :	Français (fre)
Tags :	Guide d'ondes  cristal magnéto-photonique bidimensionnel planaire  structure Bi:YIG/SiO2  structure BIG/GGG  Bande interdite photonique complète  Effet Faraday  Capteur de champ magnétique sensible  2D MPC slab waveguide  Bi:YIG/SiO2 structure  BIG/GGG structure  Complete PBG  Faraday effect  Sensitive magnetic field sensor  ?????? ?????? ?????? ??????? ?????????-?????? ????? ??????? ??????  ???? Bi:YIG/SiO2  ???? BIG/GGG  ?????? ?????? ???????? ??????  ????? ???????  ??????? ???? ???????? ????
Index. décimale :	621 Electronique
Résumé :	This thesis is essentially dedicated to the study of physical properties in magneto-photonic crystals. The aim is to optimize a two-dimensional magneto-photonic crystal slab waveguide structure for producing a sensitive magnetic field sensor. We used two simulation software's that are perfectly suited to the study of structures based on magneto-photonic crystals. BandSOLVE uses the plane wave method (PWE) and BeamPPROP using the beam propagation method (BPM). We studied two types of structures: (Bi:YIG/SiO2) and (BIG/GGG), whose materials are bismuth iron garnet BIG and bismuth substituted yttrium iron garnet Bi:YIG which have very interesting magneto-optical properties. A kind of magnetic field sensor (MFS) using a two-dimensional (2D) magnetic photonic crystal (MPC) slab waveguide as the sensing structure is proposed and investigated numerically. The slab structure is based on bismuth iron garnet (BIG), a well-known magnetic material with effective magneto-optical (MO) properties, sandwiched with gadolinium gallium garnet (GGG) as substrate. The complete photonic band gap (PBG) of the 2D MPC is simulated and optimized for realization of polarization-independent waveguides. The simulation results show that the width and position of the complete PBG depend on the thickness of the BIG slab and the radius of the air holes used in the design. By reducing the lightwave propagation losses and enhancing the mode conversion ratio, increased sensitivity is obtained. Based on the Faraday effect, a good linear relationship is observed between the normalized output light intensity and the magnetic field strength as the gyrotropy parameter g is varied from 0.13 to 0.19, a g-range used as the sensor dynamic range. The remarkable enhancement in sensing performance due to the MO effect makes the designed device suitable for magnetic field sensing. The results are discussed to provide a basis for investigation of 2D MPC slab waveguides based on the same structure, which are of particular interest for development of highly sensitive MFSs.
Diplôme :	Doctorat
En ligne :	../theses/electronique/DEG7385.pdf
Format de la ressource électronique :	pdf
Permalink :	https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=11035

Etude des propriétés physiques dans les cristaux magnéto photoniques [texte imprimé] / Rachid Deghdak, Auteur ; Mouhamed Bouchemat, Directeur de thèse . - [S.l.] : جامعة الإخوة منتوري قسنطينة, 2018 . - 130 f. ; 30 cm.
2 copies imprimées disponibles

Langues : Français (fre)

Tags :	Guide d'ondes  cristal magnéto-photonique bidimensionnel planaire  structure Bi:YIG/SiO2  structure BIG/GGG  Bande interdite photonique complète  Effet Faraday  Capteur de champ magnétique sensible  2D MPC slab waveguide  Bi:YIG/SiO2 structure  BIG/GGG structure  Complete PBG  Faraday effect  Sensitive magnetic field sensor  ?????? ?????? ?????? ??????? ?????????-?????? ????? ??????? ??????  ???? Bi:YIG/SiO2  ???? BIG/GGG  ?????? ?????? ???????? ??????  ????? ???????  ??????? ???? ???????? ????
Index. décimale :	621 Electronique
Résumé :	This thesis is essentially dedicated to the study of physical properties in magneto-photonic crystals. The aim is to optimize a two-dimensional magneto-photonic crystal slab waveguide structure for producing a sensitive magnetic field sensor. We used two simulation software's that are perfectly suited to the study of structures based on magneto-photonic crystals. BandSOLVE uses the plane wave method (PWE) and BeamPPROP using the beam propagation method (BPM). We studied two types of structures: (Bi:YIG/SiO2) and (BIG/GGG), whose materials are bismuth iron garnet BIG and bismuth substituted yttrium iron garnet Bi:YIG which have very interesting magneto-optical properties. A kind of magnetic field sensor (MFS) using a two-dimensional (2D) magnetic photonic crystal (MPC) slab waveguide as the sensing structure is proposed and investigated numerically. The slab structure is based on bismuth iron garnet (BIG), a well-known magnetic material with effective magneto-optical (MO) properties, sandwiched with gadolinium gallium garnet (GGG) as substrate. The complete photonic band gap (PBG) of the 2D MPC is simulated and optimized for realization of polarization-independent waveguides. The simulation results show that the width and position of the complete PBG depend on the thickness of the BIG slab and the radius of the air holes used in the design. By reducing the lightwave propagation losses and enhancing the mode conversion ratio, increased sensitivity is obtained. Based on the Faraday effect, a good linear relationship is observed between the normalized output light intensity and the magnetic field strength as the gyrotropy parameter g is varied from 0.13 to 0.19, a g-range used as the sensor dynamic range. The remarkable enhancement in sensing performance due to the MO effect makes the designed device suitable for magnetic field sensing. The results are discussed to provide a basis for investigation of 2D MPC slab waveguides based on the same structure, which are of particular interest for development of highly sensitive MFSs.
Diplôme :	Doctorat
En ligne :	../theses/electronique/DEG7385.pdf
Format de la ressource électronique :	pdf
Permalink :	https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=11035

Titre :	Nanoagregats de Nickel et d’Argent : Mecanismes de formation et proprietes.
Type de document :	texte imprimé
Auteurs :	Mohamed Larbi Hioul, Auteur ; Nassira Keghouche, Directeur de thèse
Editeur :	جامعة الإخوة منتوري قسنطينة
Année de publication :	2018
Importance :	124 f.
Format :	30 cm.
Note générale :	2 copies imprimées disponibles
Langues :	Français (fre)
Tags :	clusters  agrégats  nickel  argent  radiolyse pulsée  aggregates  silver  pulse radiolysis  ???????????  ??????  ?????  ?????????????????
Index. décimale :	530 Physique
Résumé :	Metallic aggregates in colloidal phases or supported aggregates attract increasing attention of researchers because of the wide range of possible applications (catalysis, environment, non-linear optics, biology and medicine). Radiolysis ranks among the most effective methods for the reduction of ions, giving the possibility of synthesis of aggregates of atoms. It is a powerful method to control the size of the particles, their location on the surface or volume. In the first part of this work, the morphological and structural properties of silver aggregates supported on silica were studied. X-ray diffraction identified the Ag6Si2O7 phase for different Ag+ ion charges as well as heat-treated samples. The FTIR spectroscopy study of Ag/SiO2 samples revealed the vibrations of Si-O-Si, Si-OH, Ag-O and Ag-SO4 bonds at the respective wave numbers 468, 810, 615 and 641 cm-1. The study of the optical properties of Ag/SiO2 nanoagreggates by UV- visible spectrophotometry showed the presence, in addition to a broadband in the visible range, three peaks in the UV domain. After reduction under hydrogen, the metal Ag phase of nanometric size was identified by XRD. In the second part, we studied, by time-resolved pulse radiolysis, nickel clusters in suspension. The formation of Ni+ ions and then those of nickel atoms was observed. The ionizing radiation generation of nickel aggregates in solution was observed for the first time live during this work.
Diplôme :	Doctorat en sciences
En ligne :	../theses/physique/HIO7384.pdf
Format de la ressource électronique :	pdf
Permalink :	https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=11034

Nanoagregats de Nickel et d’Argent : Mecanismes de formation et proprietes. [texte imprimé] / Mohamed Larbi Hioul, Auteur ; Nassira Keghouche, Directeur de thèse . - [S.l.] : جامعة الإخوة منتوري قسنطينة, 2018 . - 124 f. ; 30 cm.
2 copies imprimées disponibles

Langues : Français (fre)

Tags :	clusters  agrégats  nickel  argent  radiolyse pulsée  aggregates  silver  pulse radiolysis  ???????????  ??????  ?????  ?????????????????
Index. décimale :	530 Physique
Résumé :	Metallic aggregates in colloidal phases or supported aggregates attract increasing attention of researchers because of the wide range of possible applications (catalysis, environment, non-linear optics, biology and medicine). Radiolysis ranks among the most effective methods for the reduction of ions, giving the possibility of synthesis of aggregates of atoms. It is a powerful method to control the size of the particles, their location on the surface or volume. In the first part of this work, the morphological and structural properties of silver aggregates supported on silica were studied. X-ray diffraction identified the Ag6Si2O7 phase for different Ag+ ion charges as well as heat-treated samples. The FTIR spectroscopy study of Ag/SiO2 samples revealed the vibrations of Si-O-Si, Si-OH, Ag-O and Ag-SO4 bonds at the respective wave numbers 468, 810, 615 and 641 cm-1. The study of the optical properties of Ag/SiO2 nanoagreggates by UV- visible spectrophotometry showed the presence, in addition to a broadband in the visible range, three peaks in the UV domain. After reduction under hydrogen, the metal Ag phase of nanometric size was identified by XRD. In the second part, we studied, by time-resolved pulse radiolysis, nickel clusters in suspension. The formation of Ni+ ions and then those of nickel atoms was observed. The ionizing radiation generation of nickel aggregates in solution was observed for the first time live during this work.
Diplôme :	Doctorat en sciences
En ligne :	../theses/physique/HIO7384.pdf
Format de la ressource électronique :	pdf
Permalink :	https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=11034

Titre :	Elaboration des Couches minces du Semiconducteur ZnO dopées au Cobalt et étude de leurs propriétés structurales, optiques et électriques.
Type de document :	texte imprimé
Auteurs :	Ahmed Reda Khantoul, Auteur ; Miloud Seffari, Directeur de thèse
Editeur :	جامعة الإخوة منتوري قسنطينة
Année de publication :	2018
Importance :	108 f.
Format :	30 cm.
Note générale :	2 copies imprimées disponibles
Langues :	Français (fre)
Tags :	Oxyde de zinc  Cobalt  Couches minces  Dip-Coating  Sol-Gel  DRX  MEB  AFM  Raman  UV-Visible  photoluminescence  Zinc oxide  cobalt  thin films  SEM  ????? ?????  ??????  ???? ????????  ???????-???????  ????? ???? ?????? ???????  ?????? ?????????? ??????  ???? ????? ??????  ?????? ????? ??????  ??????? ?????? ?????? ??? ?????????-???????  ????? ?????? ??????
Index. décimale :	530 Physique
Résumé :	The present work consists in the elaboration and characterization of the undoped and cobalt-doped ZnO with different concentrations of cobalt (Co) (0.5, 1, 5 and 10% in weight) thin films in order to improve the structural, morphological, optical and electrical properties of ZnO. The samples were prepared using the Sol-Gel method and deposited on glass substrates by the Dip-coating ""Dipping-Drawing"" technique. Structural haracterization showed the formation of ZnO of hexagonal structure (wurtzite) with a preferential orientation according to plane (002) and made it possible to determine the nanometric size of the crystallites. The SEM and AFM images revealed the nanometric character of our layers. Raman scattering confirmed the results of the XRD, namely the formation of ZnO with an hexagonal structure (wurtzite). UV-visible spectroscopy has shown that our layers have a transparency, in the visible, which varies between 80 and 98%. It has shown also that the gap decreases with the increase in doping. The hotoluminescence of the films showed ultraviolet (UV) and visible emissions related to defects. The codoping of aluminum to cobalt allowed us also to improve the structural and optical properties.
Diplôme :	Doctorat en sciences
En ligne :	../theses/physique/KHA7383.pdf
Format de la ressource électronique :	pdf
Permalink :	https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=11033

Elaboration des Couches minces du Semiconducteur ZnO dopées au Cobalt et étude de leurs propriétés structurales, optiques et électriques. [texte imprimé] / Ahmed Reda Khantoul, Auteur ; Miloud Seffari, Directeur de thèse . - [S.l.] : جامعة الإخوة منتوري قسنطينة, 2018 . - 108 f. ; 30 cm.
2 copies imprimées disponibles

Langues : Français (fre)

Tags :	Oxyde de zinc  Cobalt  Couches minces  Dip-Coating  Sol-Gel  DRX  MEB  AFM  Raman  UV-Visible  photoluminescence  Zinc oxide  cobalt  thin films  SEM  ????? ?????  ??????  ???? ????????  ???????-???????  ????? ???? ?????? ???????  ?????? ?????????? ??????  ???? ????? ??????  ?????? ????? ??????  ??????? ?????? ?????? ??? ?????????-???????  ????? ?????? ??????
Index. décimale :	530 Physique
Résumé :	The present work consists in the elaboration and characterization of the undoped and cobalt-doped ZnO with different concentrations of cobalt (Co) (0.5, 1, 5 and 10% in weight) thin films in order to improve the structural, morphological, optical and electrical properties of ZnO. The samples were prepared using the Sol-Gel method and deposited on glass substrates by the Dip-coating ""Dipping-Drawing"" technique. Structural haracterization showed the formation of ZnO of hexagonal structure (wurtzite) with a preferential orientation according to plane (002) and made it possible to determine the nanometric size of the crystallites. The SEM and AFM images revealed the nanometric character of our layers. Raman scattering confirmed the results of the XRD, namely the formation of ZnO with an hexagonal structure (wurtzite). UV-visible spectroscopy has shown that our layers have a transparency, in the visible, which varies between 80 and 98%. It has shown also that the gap decreases with the increase in doping. The hotoluminescence of the films showed ultraviolet (UV) and visible emissions related to defects. The codoping of aluminum to cobalt allowed us also to improve the structural and optical properties.
Diplôme :	Doctorat en sciences
En ligne :	../theses/physique/KHA7383.pdf
Format de la ressource électronique :	pdf
Permalink :	https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=11033

Titre :	Conception et intégration d’un nouveau piezo-generateur et d’un système de stockage hybride batteries-supercondensateurs pour la génération et l’amélioration de la qualité d’énergie électrique
Type de document :	texte imprimé
Auteurs :	Yahia Bouzelata, Auteur ; Rachid Chenni, Directeur de thèse
Editeur :	جامعة الإخوة منتوري قسنطينة
Année de publication :	2018
Importance :	208 f.
Format :	30 cm.
Note générale :	2 copies imprimées disponibles
Langues :	Français (fre)
Tags :	piézoélectricité  générateur PZT  circuits d’extraction  stokage hypride  batteries  supercondensateur  qualité d'énergie  piezoelectric  PZT generator  extraction circuit  hybrid storage  Battery-supercapacitor  energy quality  ?????? ?????  ???? ???? ????  ???? ?????????  ??????? ??????  ?????????  ???????? ???????  ????? ??????
Index. décimale :	622 Electro-Technique
Résumé :	A large number of studies have been published in the last decade on the possibility of harvesting vibratory energy using piezoelectricity as a conversion mechanism. Several aspects have been studied ranging from different electromechanical models through harvester forms maximizing performance to electrical circuits allowing an improvement of the harvesting energy. By spreading through the distribution electrical networks, the problem of harmonic pollution is becoming more and more worrying with the increasing use of electronic components and nonlinear loads, which leads to harmful consequences and therefore a malfunction of several devices sensitive to this kind of problems. Active power filtering is one of the most effective solutions to this problem. The contribution that brings this thesis, in the energy harvester and improvement field, consists to design a new optimal wind vibratory energy harvester using piezoelectric elements. The work of this thesis revolves around five objectives: 1. Design and experimental validation of a power generator based on piezoelectric transduction and wind flow. 2. Development of an analytical model to predict the performances and explain the chosen geometry of the piezoelectric wind energy harvester. 3. Development of an energy extraction circuit to maximize the harvested power by the piezoelectric elements and adapt the generated voltages to a high level. 4. Design of a hybrid supercapacitors batteries system to store the harvested energy by the wind piezoelectric generator and provide the power difference when an active power imbalance occurs in the harvester system. 5. Development of an active filter compensation model based on piezoelectric harvester not only to mitigate the harmonic currents and voltages in the distribution electrical networks but also to compensate the reactive power on the source side. In order to meet these objectives, at the beginning, we started with a reminder of the potential sources of harvested energy and the different conversion types including piezoelectric conversion and we have established a state of the art of the energy harvesting from piezoelectric elements. Then we presented theoretical notions of piezoelectricity followed by a detailed study of the piezoelectric phenomenon in order to use it in a vibratory energy harvesting structure and we have exposed a state of the art of piezoelectric generators with a macroscopic structure. Next, we have described bimetallic piezoelectric type structure as an example of application. After that, we presented the design, modeling, and the description of the proposed wind piezoelectric harvester, and we have established a literature review of the different generators models based on piezoelectric transduction and wind flow. In addition, the experimental validation of the piezoelectric generator model constituting our original contribution for that a large space was reserved for the presentation of the design process, fabrication and experimental assembly of the device after having developed a special analytical model. Besides, we showed how the extraction of the harvested energy can be conceived in order to maximize the power and adapt the generated voltages to the different electrical uses and how the storage of energy can be reached by a hybrid supercapacitors batteries system in a piezoelectric transduction mode. In the last step, we presented globally the problem of harmonics and the active filters as an effective solution. In addition, on the one hand, we applied a group of 8 identical PZT generators to the parallel active filter for current harmonics compensation, and on the other hand, we associated a group of 8 GEPZT to the series active filter to react against voltage harmonics and in the target to demonstrate its flexibility with piezoelectric systems.
Diplôme :	Doctorat
En ligne :	../theses/electrotec/BOU7382.pdf
Format de la ressource électronique :	pdf
Permalink :	https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=11032

Conception et intégration d’un nouveau piezo-generateur et d’un système de stockage hybride batteries-supercondensateurs pour la génération et l’amélioration de la qualité d’énergie électrique [texte imprimé] / Yahia Bouzelata, Auteur ; Rachid Chenni, Directeur de thèse . - [S.l.] : جامعة الإخوة منتوري قسنطينة, 2018 . - 208 f. ; 30 cm.
2 copies imprimées disponibles

Langues : Français (fre)

Tags :	piézoélectricité  générateur PZT  circuits d’extraction  stokage hypride  batteries  supercondensateur  qualité d'énergie  piezoelectric  PZT generator  extraction circuit  hybrid storage  Battery-supercapacitor  energy quality  ?????? ?????  ???? ???? ????  ???? ?????????  ??????? ??????  ?????????  ???????? ???????  ????? ??????
Index. décimale :	622 Electro-Technique
Résumé :	A large number of studies have been published in the last decade on the possibility of harvesting vibratory energy using piezoelectricity as a conversion mechanism. Several aspects have been studied ranging from different electromechanical models through harvester forms maximizing performance to electrical circuits allowing an improvement of the harvesting energy. By spreading through the distribution electrical networks, the problem of harmonic pollution is becoming more and more worrying with the increasing use of electronic components and nonlinear loads, which leads to harmful consequences and therefore a malfunction of several devices sensitive to this kind of problems. Active power filtering is one of the most effective solutions to this problem. The contribution that brings this thesis, in the energy harvester and improvement field, consists to design a new optimal wind vibratory energy harvester using piezoelectric elements. The work of this thesis revolves around five objectives: 1. Design and experimental validation of a power generator based on piezoelectric transduction and wind flow. 2. Development of an analytical model to predict the performances and explain the chosen geometry of the piezoelectric wind energy harvester. 3. Development of an energy extraction circuit to maximize the harvested power by the piezoelectric elements and adapt the generated voltages to a high level. 4. Design of a hybrid supercapacitors batteries system to store the harvested energy by the wind piezoelectric generator and provide the power difference when an active power imbalance occurs in the harvester system. 5. Development of an active filter compensation model based on piezoelectric harvester not only to mitigate the harmonic currents and voltages in the distribution electrical networks but also to compensate the reactive power on the source side. In order to meet these objectives, at the beginning, we started with a reminder of the potential sources of harvested energy and the different conversion types including piezoelectric conversion and we have established a state of the art of the energy harvesting from piezoelectric elements. Then we presented theoretical notions of piezoelectricity followed by a detailed study of the piezoelectric phenomenon in order to use it in a vibratory energy harvesting structure and we have exposed a state of the art of piezoelectric generators with a macroscopic structure. Next, we have described bimetallic piezoelectric type structure as an example of application. After that, we presented the design, modeling, and the description of the proposed wind piezoelectric harvester, and we have established a literature review of the different generators models based on piezoelectric transduction and wind flow. In addition, the experimental validation of the piezoelectric generator model constituting our original contribution for that a large space was reserved for the presentation of the design process, fabrication and experimental assembly of the device after having developed a special analytical model. Besides, we showed how the extraction of the harvested energy can be conceived in order to maximize the power and adapt the generated voltages to the different electrical uses and how the storage of energy can be reached by a hybrid supercapacitors batteries system in a piezoelectric transduction mode. In the last step, we presented globally the problem of harmonics and the active filters as an effective solution. In addition, on the one hand, we applied a group of 8 identical PZT generators to the parallel active filter for current harmonics compensation, and on the other hand, we associated a group of 8 GEPZT to the series active filter to react against voltage harmonics and in the target to demonstrate its flexibility with piezoelectric systems.
Diplôme :	Doctorat
En ligne :	../theses/electrotec/BOU7382.pdf
Format de la ressource électronique :	pdf
Permalink :	https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=11032

Titre :	Study of the order disorder transitions and the mechanical properties in the metallic alloys (AuCu and AuCuAg).
Type de document :	texte imprimé
Auteurs :	Imene Lamiri, Auteur ; Djamel Hamana, Directeur de thèse
Editeur :	جامعة الإخوة منتوري قسنطينة
Année de publication :	2018
Importance :	133 f.
Note générale :	2 copies imprimées disponibles
Langues :	Anglais (eng)
Tags :	12 and 18-carat  gold  silver  copper  thermal analyses  precipitation  dendrite  mechanical spectroscopy  anelasticity  internal dissipation  Zener relaxation  twin boundary relaxation  grainboundaries sliding relaxation  12 et 18 carats  or  argent  cuivre  analyses thermiques  précipitation  spectroscopie mécanique  anélasticité  dissipation interne  relaxation de Zener  relaxation des joints de macles  joints de grains  21? 18 ?????  ????  ???  ???????? ????????  ???????  ???? ????  ??????? ???????????  ??? ???  ??????? ???????  ??????? ????  ???? ??????? ?????????  ??????? ?????? ??????
Index. décimale :	530 Physique
Résumé :	This work is motivated by a scientific interest in gaining a better understanding of the phase transformations that govern the mechanical properties of gold alloys due to their huge industrial importance such as their common use in jewelry applications, luxury watch making, catalyses, electronic industries ...etc... The selected alloys fall in one of two categories of yellow gold, based on the binary system of GoldCopper and the ternary system Gold–Copper–Silver In this thesis, selected alloys from the two categories are studied, using two principal compositions of 12 and 18-carat. The study starts primarily by the thermal identification of the possible anomalies that could happen during the heating from the room temperature up to 973K (temperature near to the industrial use -1023K). Un expectable anomaly at low temperature has been noticed by the thermal analyses while the primary state before the heating process was the disorder. The fact that has orientate the study to the use of surface techniques in order to determine the relationship of the thermally detected anomalies with the surface aspect of the alloys. The study has lead to highlight new kind of metastable phase transition that precede the ordering reaction in gold alloys at low temperature presented in dendrite shape of precipitated phase on the surface. The participation of the silver in the alloy composition leads to accelerate the ordering reaction. 18-carat binary composition, has been treated in the thorough way in terms of structural study. Using the in-situ temperature XRD measurement with data acquisition frequency of 1 pattern/1.1min. Phase transition sequences and temperatures have been determined over the fitting of the obtained patterns and through the following of the behavior evolution of the intensities of the typical peak of every phase as well as the atomic volume occupancy. The analysis and interpretation of the experimental data stemming from the mechanical spectroscopy reveal three important anelastic relaxations (internal dissipation processes), which dominate the mechanical loss spectrum of the binary 18-carat alloy above room temperature. A Zener relaxation, due to directional ordering of atoms in the substitutional solid solution, occurs nearby the phase transition AuCuI - AuCuII upon heating and the classic Zener relaxation peak accompanies the phase transition A1 - AuCuI + AuCuII upon cooling. An antiphase boundaries relaxation peak has been highlighted as typical peak of the AuCuII. Grain boundaries sliding relaxation peak has been attributed to the pure disordered phase
Diplôme :	Doctorat
En ligne :	../theses/physique/LAM7381.pdf
Format de la ressource électronique :	pdf
Permalink :	https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=11031

Study of the order disorder transitions and the mechanical properties in the metallic alloys (AuCu and AuCuAg). [texte imprimé] / Imene Lamiri, Auteur ; Djamel Hamana, Directeur de thèse . - [S.l.] : جامعة الإخوة منتوري قسنطينة, 2018 . - 133 f.
2 copies imprimées disponibles

Langues : Anglais (eng)

Tags :	12 and 18-carat  gold  silver  copper  thermal analyses  precipitation  dendrite  mechanical spectroscopy  anelasticity  internal dissipation  Zener relaxation  twin boundary relaxation  grainboundaries sliding relaxation  12 et 18 carats  or  argent  cuivre  analyses thermiques  précipitation  spectroscopie mécanique  anélasticité  dissipation interne  relaxation de Zener  relaxation des joints de macles  joints de grains  21? 18 ?????  ????  ???  ???????? ????????  ???????  ???? ????  ??????? ???????????  ??? ???  ??????? ???????  ??????? ????  ???? ??????? ?????????  ??????? ?????? ??????
Index. décimale :	530 Physique
Résumé :	This work is motivated by a scientific interest in gaining a better understanding of the phase transformations that govern the mechanical properties of gold alloys due to their huge industrial importance such as their common use in jewelry applications, luxury watch making, catalyses, electronic industries ...etc... The selected alloys fall in one of two categories of yellow gold, based on the binary system of GoldCopper and the ternary system Gold–Copper–Silver In this thesis, selected alloys from the two categories are studied, using two principal compositions of 12 and 18-carat. The study starts primarily by the thermal identification of the possible anomalies that could happen during the heating from the room temperature up to 973K (temperature near to the industrial use -1023K). Un expectable anomaly at low temperature has been noticed by the thermal analyses while the primary state before the heating process was the disorder. The fact that has orientate the study to the use of surface techniques in order to determine the relationship of the thermally detected anomalies with the surface aspect of the alloys. The study has lead to highlight new kind of metastable phase transition that precede the ordering reaction in gold alloys at low temperature presented in dendrite shape of precipitated phase on the surface. The participation of the silver in the alloy composition leads to accelerate the ordering reaction. 18-carat binary composition, has been treated in the thorough way in terms of structural study. Using the in-situ temperature XRD measurement with data acquisition frequency of 1 pattern/1.1min. Phase transition sequences and temperatures have been determined over the fitting of the obtained patterns and through the following of the behavior evolution of the intensities of the typical peak of every phase as well as the atomic volume occupancy. The analysis and interpretation of the experimental data stemming from the mechanical spectroscopy reveal three important anelastic relaxations (internal dissipation processes), which dominate the mechanical loss spectrum of the binary 18-carat alloy above room temperature. A Zener relaxation, due to directional ordering of atoms in the substitutional solid solution, occurs nearby the phase transition AuCuI - AuCuII upon heating and the classic Zener relaxation peak accompanies the phase transition A1 - AuCuI + AuCuII upon cooling. An antiphase boundaries relaxation peak has been highlighted as typical peak of the AuCuII. Grain boundaries sliding relaxation peak has been attributed to the pure disordered phase
Diplôme :	Doctorat
En ligne :	../theses/physique/LAM7381.pdf
Format de la ressource électronique :	pdf
Permalink :	https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=11031

Titre :	Application du SIG et de la télédétection pour un outil cartographique d'aide à la gestion des feux de forêts dans la wilaya d'El Tarf
Type de document :	texte imprimé
Auteurs :	Azzedine Mohamed Touffik Arfa, Auteur ; Med EL Habib Benderradji, Directeur de thèse ; Thierry Saint-Gerand, Directeur de thèse
Editeur :	جامعة الإخوة منتوري قسنطينة
Année de publication :	2019
Importance :	195 f.
Format :	30 cm.
Note générale :	2 copies imprimées disponibles
Langues :	Français (fre)
Tags :	Feux  Forêts  SIG  Risque  Télédétection  fire  forst  GIS  risk  remet  sensing  ???????  ???? ????????? ?????????  ?????  ????????? ?? ???
Index. décimale :	570 Sciences de la vie. Biologie
Résumé :	This study examines the risk space of wildfires in the forest tracts of the province of El Tarf (North-East of Algeria). Wildfires have been a nation-wide concern for more than a decade now, and the various actions taken to prevent and suppress them did not result in a significant drop in their number or a decrease in the area of burnt land. Measures of punctual treatment of the visible symptoms of wildfires having reached their limits, this research aims at designing new forms of operational maps to be used for the management of forest lands in order to reduce the number and impact of wildfires. Earth observation satellite data associated with the different types of forest fire information, once integrated into a geographic information system, have proved to be a reliable option for monitoring emergencies, identifying areas at risk, and mapping the extent of the fires. The geographical database compiled in this work is an extremely useful tool for understanding and monitoring wildfires and will provide managers and decision takers with valid arguments to justify their decisions.
Diplôme :	Doctorat en sciences
En ligne :	../theses/biologie/ARF7462.pdf
Format de la ressource électronique :	pdf
Permalink :	https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=11030

Application du SIG et de la télédétection pour un outil cartographique d'aide à la gestion des feux de forêts dans la wilaya d'El Tarf [texte imprimé] / Azzedine Mohamed Touffik Arfa, Auteur ; Med EL Habib Benderradji, Directeur de thèse ; Thierry Saint-Gerand, Directeur de thèse . - [S.l.] : جامعة الإخوة منتوري قسنطينة, 2019 . - 195 f. ; 30 cm.
2 copies imprimées disponibles

Langues : Français (fre)

Tags :	Feux  Forêts  SIG  Risque  Télédétection  fire  forst  GIS  risk  remet  sensing  ???????  ???? ????????? ?????????  ?????  ????????? ?? ???
Index. décimale :	570 Sciences de la vie. Biologie
Résumé :	This study examines the risk space of wildfires in the forest tracts of the province of El Tarf (North-East of Algeria). Wildfires have been a nation-wide concern for more than a decade now, and the various actions taken to prevent and suppress them did not result in a significant drop in their number or a decrease in the area of burnt land. Measures of punctual treatment of the visible symptoms of wildfires having reached their limits, this research aims at designing new forms of operational maps to be used for the management of forest lands in order to reduce the number and impact of wildfires. Earth observation satellite data associated with the different types of forest fire information, once integrated into a geographic information system, have proved to be a reliable option for monitoring emergencies, identifying areas at risk, and mapping the extent of the fires. The geographical database compiled in this work is an extremely useful tool for understanding and monitoring wildfires and will provide managers and decision takers with valid arguments to justify their decisions.
Diplôme :	Doctorat en sciences
En ligne :	../theses/biologie/ARF7462.pdf
Format de la ressource électronique :	pdf
Permalink :	https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=11030

Titre :	Identification polyphasique des souches d’actinobactéries isolées d’échantillons de sols semi-arides : Caractérisation structurale des antibiotiques produits.
Type de document :	texte imprimé
Auteurs :	Nassima Leulmi, Auteur ; Abderrahmane Boulahrouf, Directeur de thèse
Editeur :	جامعة الإخوة منتوري قسنطينة
Année de publication :	2018
Importance :	174 f.
Format :	30 cm.
Note générale :	2 copies imprimées disponibles
Langues :	Français (fre)
Tags :	Actinobactéries  Streptomyces  sols semi-arides  antibiotiques  polyéthers ionophores  cytotoxicité  Actinobacteria  Semi-arid soils  Antibiotics  ionophoric polyethers  Cytotoxicity  ???????????????  ??? ??? ????  ???????? ???????  polyéthers  ionophores ?????? ??????
Index. décimale :	570 Sciences de la vie. Biologie
Résumé :	Actinobacteria are a group of filamentous bacteria, mainly inhabit the soil. They are known for producing a wide variety of bioactive molecules, especially antibiotics. Is in this context that our research work focused. A total of 99 isolates were recovered from a semi-arid soi,collected from; rhizospheric associated soil (Khenchela), mountain soil (Mount chélia region, khenchela) and Sebkha soil (Oum El bouaghi). Three strains (SF10, SFKH4 and SFKH10), were selected, based on preliminary screening for antimicrobial activity. The isolates were identified as belonging to the genus Streptomyces, based on phenotypic and chemotaxonomic study. Phylogenetic analysis revealed that the strains SF10, SFKH4 and SFKH10 were most closely related to Streptomyces youssoufiensis, Streptomyces spororaveus and Streptomyces coeruleorubidus with a pairwise 16S rRNA gene sequence similarity of 99, 8, 99 % and 99%. Ethyl acetate extracts provied by the culture of the strains on solid culture were tested for their antimicrobial activity against the test microorganisms. The structure elucidation of the biologically active molecules, purified by different chromatographic methods, was carried out by coupling several techniques of mass spectrometry and Nuclear Magnetic Resonance (1H NMR, 13C NMR, MS, MS tandem, IR and UV-Visible). Streptomyces youssoufiensis SF10 strain produced several molecules belonging to ionophoric polyethers family, abierixin, nigericin, epinigericin, and the newly isolated grisorixin methyl ester. Moreover, only one molecule, belonging to macrotetrolides family (dinactin), was obtained from Streptomyces coeruleorubidus SFKH10 strain. In addition, the partial characterization of the molecules secreted by S. spororaveus SFKH4 strain has shown its capacity to produce a large variety of complexes compounds having high molecular weight. The presence of epimeric forms of nigericin/epinigericin and grisorixin/epigrisorixin has spurred DFT (Density Functional Theory) computational calculations. This analysis was able to provide the relative stability of the most favored epimers. This consideration is of general interest and can be applied to the wide class of naturally occurring polycyclic polyethers. On the other hand, the study of the cytotoxicity of the purified and identified molecules revealed that both nigericin and grisorixin methyl ester showed to affect glioblastoma stem cells proliferation in a dose-dependent manner, with a higher activity for the more lipophilic grisorixin methyl ester (IC50 values of 3.85 and 3.05 μM for VIPI and COMI humain glioblastoma stem cells, respectively). In conclusion, the present study has revealed the potential of semi-arid Algerian ecosystems as a good source for bioactives molecules-producing actinobacteria, specialy Streptomyces youssoufienisis SF10 strain whose secondary metabolites profile has not been studied so far by bioguided method. The clear antiproliferative activity of grisorixin methyl ester on glioblastoma stem cells represents a promising starting point aimed to the development of new drug candidates in the treatment of glioblastoma multiforme.
Diplôme :	Doctorat en sciences
Permalink :	https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=11029

Identification polyphasique des souches d’actinobactéries isolées d’échantillons de sols semi-arides : Caractérisation structurale des antibiotiques produits. [texte imprimé] / Nassima Leulmi, Auteur ; Abderrahmane Boulahrouf, Directeur de thèse . - [S.l.] : جامعة الإخوة منتوري قسنطينة, 2018 . - 174 f. ; 30 cm.
2 copies imprimées disponibles

Langues : Français (fre)

Tags :	Actinobactéries  Streptomyces  sols semi-arides  antibiotiques  polyéthers ionophores  cytotoxicité  Actinobacteria  Semi-arid soils  Antibiotics  ionophoric polyethers  Cytotoxicity  ???????????????  ??? ??? ????  ???????? ???????  polyéthers  ionophores ?????? ??????
Index. décimale :	570 Sciences de la vie. Biologie
Résumé :	Actinobacteria are a group of filamentous bacteria, mainly inhabit the soil. They are known for producing a wide variety of bioactive molecules, especially antibiotics. Is in this context that our research work focused. A total of 99 isolates were recovered from a semi-arid soi,collected from; rhizospheric associated soil (Khenchela), mountain soil (Mount chélia region, khenchela) and Sebkha soil (Oum El bouaghi). Three strains (SF10, SFKH4 and SFKH10), were selected, based on preliminary screening for antimicrobial activity. The isolates were identified as belonging to the genus Streptomyces, based on phenotypic and chemotaxonomic study. Phylogenetic analysis revealed that the strains SF10, SFKH4 and SFKH10 were most closely related to Streptomyces youssoufiensis, Streptomyces spororaveus and Streptomyces coeruleorubidus with a pairwise 16S rRNA gene sequence similarity of 99, 8, 99 % and 99%. Ethyl acetate extracts provied by the culture of the strains on solid culture were tested for their antimicrobial activity against the test microorganisms. The structure elucidation of the biologically active molecules, purified by different chromatographic methods, was carried out by coupling several techniques of mass spectrometry and Nuclear Magnetic Resonance (1H NMR, 13C NMR, MS, MS tandem, IR and UV-Visible). Streptomyces youssoufiensis SF10 strain produced several molecules belonging to ionophoric polyethers family, abierixin, nigericin, epinigericin, and the newly isolated grisorixin methyl ester. Moreover, only one molecule, belonging to macrotetrolides family (dinactin), was obtained from Streptomyces coeruleorubidus SFKH10 strain. In addition, the partial characterization of the molecules secreted by S. spororaveus SFKH4 strain has shown its capacity to produce a large variety of complexes compounds having high molecular weight. The presence of epimeric forms of nigericin/epinigericin and grisorixin/epigrisorixin has spurred DFT (Density Functional Theory) computational calculations. This analysis was able to provide the relative stability of the most favored epimers. This consideration is of general interest and can be applied to the wide class of naturally occurring polycyclic polyethers. On the other hand, the study of the cytotoxicity of the purified and identified molecules revealed that both nigericin and grisorixin methyl ester showed to affect glioblastoma stem cells proliferation in a dose-dependent manner, with a higher activity for the more lipophilic grisorixin methyl ester (IC50 values of 3.85 and 3.05 μM for VIPI and COMI humain glioblastoma stem cells, respectively). In conclusion, the present study has revealed the potential of semi-arid Algerian ecosystems as a good source for bioactives molecules-producing actinobacteria, specialy Streptomyces youssoufienisis SF10 strain whose secondary metabolites profile has not been studied so far by bioguided method. The clear antiproliferative activity of grisorixin methyl ester on glioblastoma stem cells represents a promising starting point aimed to the development of new drug candidates in the treatment of glioblastoma multiforme.
Diplôme :	Doctorat en sciences
Permalink :	https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=11029

Titre :	Étude du comportement dynamique des composites stratifiés et sandwichs
Type de document :	texte imprimé
Auteurs :	Abdelhafid Rahmane, Auteur ; Toufik Benmansour, Directeur de thèse
Editeur :	جامعة الإخوة منتوري قسنطينة
Année de publication :	2018
Importance :	150 f.
Format :	30 cm.
Note générale :	2 copies imprimées disponibles
Langues :	Français (fre)
Tags :	Stratifié composite  Plaque sandwich  Masse attachée  Couches  Séquences d’empilement  Méthode de Taguchi  Fréquence propre  Laminate composite  Sandwich plate  Attached mass  Layers  Staking sequences  Taguchi method  Natural frequency  ??????? ???????  ???? ??????????  ???? ?????  ?????  ????? ??????
Index. décimale :	620 Génie Mécanique
Résumé :	Nowadays, the use of composite materials has taken a large place in civilian industries as well as in military and aerospace industries. In particular, composite structures with one or more attachments, such as different types of sensors, are often encountered in engineering applications. These attached masses affect the dynamic responses of the main structures. Therefore, the present thesis addresses the effect of attached mass on dynamic properties of composite laminate and sandwich plates, under flexural vibration, for clamped-free-free-free boundary conditions. Furthermore, factors influencing the effect of attached mass on the natural frequencies of laminate composite are studied using the Taguchi method. The considered factor parameters are: attached mass weight, attached mass locations from the clamped edge, staking sequences, and number of layers. In addition, the effects of the attached mass on the natural frequencies of sandwich plate according to several factors , these factors are the positions of the attached mass, the mechanical characteristics of the core, the ratios of thickness of core/ thickness the plate (hc / h), and the length / width ratios of the plate (a / b)). So, the study carried out is based on a model of calculation by the use of the finite element method. The results of this study indicate that the dynamic characteristics of the laminate composite and sandwich plates are sensitive to the attached mass, where the natural frequencies are found to be inversely proportional to the mass weight. The results were found that the locations of the attached mass are the most important factors affecting the natural frequencies of laminate plate, where the location of the masses fell into the antinodes area of vibration.
Diplôme :	Doctorat en sciences
En ligne :	../theses/gmecanique/RAH7379.pdf
Format de la ressource électronique :	pdf
Permalink :	https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=11028

Étude du comportement dynamique des composites stratifiés et sandwichs [texte imprimé] / Abdelhafid Rahmane, Auteur ; Toufik Benmansour, Directeur de thèse . - [S.l.] : جامعة الإخوة منتوري قسنطينة, 2018 . - 150 f. ; 30 cm.
2 copies imprimées disponibles

Langues : Français (fre)

Tags :	Stratifié composite  Plaque sandwich  Masse attachée  Couches  Séquences d’empilement  Méthode de Taguchi  Fréquence propre  Laminate composite  Sandwich plate  Attached mass  Layers  Staking sequences  Taguchi method  Natural frequency  ??????? ???????  ???? ??????????  ???? ?????  ?????  ????? ??????
Index. décimale :	620 Génie Mécanique
Résumé :	Nowadays, the use of composite materials has taken a large place in civilian industries as well as in military and aerospace industries. In particular, composite structures with one or more attachments, such as different types of sensors, are often encountered in engineering applications. These attached masses affect the dynamic responses of the main structures. Therefore, the present thesis addresses the effect of attached mass on dynamic properties of composite laminate and sandwich plates, under flexural vibration, for clamped-free-free-free boundary conditions. Furthermore, factors influencing the effect of attached mass on the natural frequencies of laminate composite are studied using the Taguchi method. The considered factor parameters are: attached mass weight, attached mass locations from the clamped edge, staking sequences, and number of layers. In addition, the effects of the attached mass on the natural frequencies of sandwich plate according to several factors , these factors are the positions of the attached mass, the mechanical characteristics of the core, the ratios of thickness of core/ thickness the plate (hc / h), and the length / width ratios of the plate (a / b)). So, the study carried out is based on a model of calculation by the use of the finite element method. The results of this study indicate that the dynamic characteristics of the laminate composite and sandwich plates are sensitive to the attached mass, where the natural frequencies are found to be inversely proportional to the mass weight. The results were found that the locations of the attached mass are the most important factors affecting the natural frequencies of laminate plate, where the location of the masses fell into the antinodes area of vibration.
Diplôme :	Doctorat en sciences
En ligne :	../theses/gmecanique/RAH7379.pdf
Format de la ressource électronique :	pdf
Permalink :	https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=11028

Titre :	Etude d’une chaine de conversion de l’energie Eolienne
Type de document :	texte imprimé
Auteurs :	Naim Cherfia, Auteur ; Djallel Kerdoun, Directeur de thèse
Editeur :	جامعة الإخوة منتوري قسنطينة
Année de publication :	2018
Importance :	144 f.
Format :	30 cm.
Note générale :	2 copies imprimées disponibles
Langues :	Français (fre)
Tags :	éolienne  MADA  Commande vectorielle  PI  commande par mode glissant  wind turbine  DFIM  Vector control  sliding mode control  ??????? ??????  ????? ????????? ?????? ???????  ?????? ???????  PI?????? ?????????
Index. décimale :	622 Electro-Technique
Résumé :	This work presents the study of the conversion of energy produced by Doubly Fed Induction generator connected directly to the network by its stator and driven by its rotor by two bidirectional converters. First, we presented the state of the art on wind energy and the conversion systems used (types of generators, most used configurations, etc ...). Then we exposed the mathematical models of each element of the wind turbine (the wind turbine and its command MPPT + the generator). Then we evaluated and examined two methods of vector control in power of the MADA in generator mode, the first to know: the direct command and the indirect command with the help of the correctors PI. According to the simulation results obtained, the indirect vector control with two cascade loops shows better performances for an invariant system. Finally, for nonlinear systems where with non-constant parameters, we applied the sliding mode control to control the active and reactive power with the use of an inverter controlled by the SVM technique to improve the electrical energy quality. to inject this energy into the electricity grid or we note that the simulation results show the reliability and robustness of this command which is given a good track of active stator power its reference with a negligible error.
Diplôme :	Doctorat en sciences
En ligne :	../theses/electrotec/CHE7378.pdf
Format de la ressource électronique :	pdf
Permalink :	https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=11027

Etude d’une chaine de conversion de l’energie Eolienne [texte imprimé] / Naim Cherfia, Auteur ; Djallel Kerdoun, Directeur de thèse . - [S.l.] : جامعة الإخوة منتوري قسنطينة, 2018 . - 144 f. ; 30 cm.
2 copies imprimées disponibles

Langues : Français (fre)

Tags :	éolienne  MADA  Commande vectorielle  PI  commande par mode glissant  wind turbine  DFIM  Vector control  sliding mode control  ??????? ??????  ????? ????????? ?????? ???????  ?????? ???????  PI?????? ?????????
Index. décimale :	622 Electro-Technique
Résumé :	This work presents the study of the conversion of energy produced by Doubly Fed Induction generator connected directly to the network by its stator and driven by its rotor by two bidirectional converters. First, we presented the state of the art on wind energy and the conversion systems used (types of generators, most used configurations, etc ...). Then we exposed the mathematical models of each element of the wind turbine (the wind turbine and its command MPPT + the generator). Then we evaluated and examined two methods of vector control in power of the MADA in generator mode, the first to know: the direct command and the indirect command with the help of the correctors PI. According to the simulation results obtained, the indirect vector control with two cascade loops shows better performances for an invariant system. Finally, for nonlinear systems where with non-constant parameters, we applied the sliding mode control to control the active and reactive power with the use of an inverter controlled by the SVM technique to improve the electrical energy quality. to inject this energy into the electricity grid or we note that the simulation results show the reliability and robustness of this command which is given a good track of active stator power its reference with a negligible error.
Diplôme :	Doctorat en sciences
En ligne :	../theses/electrotec/CHE7378.pdf
Format de la ressource électronique :	pdf
Permalink :	https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=11027

Titre :	Etude des propriétés de surface modifiée par différentes méthodes de l’alliage Ti6Al4V utilisé en odontologie.
Type de document :	texte imprimé
Auteurs :	Abdelghani Boucheham, Auteur ; A. Karaali, Directeur de thèse
Editeur :	جامعة الإخوة منتوري قسنطينة
Année de publication :	2018
Importance :	131 f.
Format :	30 cm.
Note générale :	2 copies imprimées disponibles
Langues :	Français (fre)
Tags :	Alliage de titane  implants dentaires  oxydation thermique  anodisation  TiO2 nanoporeux  spectroscopie d’impédance électrochimique  culture cellulaire  Titanium alloys  dental implants  thermal oxidation  anodization  nanoporous TiO2  electrochemical impedance spectroscopy  cells culture  ????? ??????????  ??? ???????  ??????? ????????  ? ??????? ????????  ???? ?????? ??  TiO2??????? ?????? ???????? ??????????????  ????? ???????
Index. décimale :	530 Physique
Résumé :	Nanostructured oxide layers formed on the surface of Ti6Al4V alloys by thermal oxidation, anodic oxidation and alkali-hydrothermal treatment play an important role in the enhancement of their resistant to wear and corrosion, biocompatibility and osseointegration in the human body. Different surface structures, morphologies and topographies were obtained as revealed by using the x-ray diffraction technique, scanning electron microscopy and atomic force microscopy. The nature of thermal compact oxides was found to be dependent on the temperature and the duration of oxidation, the anatase presents the predominant phase at 500°C, while it disappears at 700°C, where the rutile becomes the predominant phase with the presence of alumina phase. The layers thickness and roughness increase with the temperature and the duration of treatment. Diameters and lengths of anodic nanotubes increase with the increase of applied potentials, nanopores dimensions increase also with the increase of alkalin-hydrothermal treatment duration. All studied surfaces exhibit good wear and corrosion resistance and biocompatibility, as assessed by friction essays, open circuit potential, electrochemical impedance spectroscopy, cyclic polarisation curves and cells culture assays.
Diplôme :	Doctorat en sciences
En ligne :	../theses/physique/BOU7377.pdf
Format de la ressource électronique :	pdf
Permalink :	https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=11026

Etude des propriétés de surface modifiée par différentes méthodes de l’alliage Ti6Al4V utilisé en odontologie. [texte imprimé] / Abdelghani Boucheham, Auteur ; A. Karaali, Directeur de thèse . - [S.l.] : جامعة الإخوة منتوري قسنطينة, 2018 . - 131 f. ; 30 cm.
2 copies imprimées disponibles

Langues : Français (fre)

Tags :	Alliage de titane  implants dentaires  oxydation thermique  anodisation  TiO2 nanoporeux  spectroscopie d’impédance électrochimique  culture cellulaire  Titanium alloys  dental implants  thermal oxidation  anodization  nanoporous TiO2  electrochemical impedance spectroscopy  cells culture  ????? ??????????  ??? ???????  ??????? ????????  ? ??????? ????????  ???? ?????? ??  TiO2??????? ?????? ???????? ??????????????  ????? ???????
Index. décimale :	530 Physique
Résumé :	Nanostructured oxide layers formed on the surface of Ti6Al4V alloys by thermal oxidation, anodic oxidation and alkali-hydrothermal treatment play an important role in the enhancement of their resistant to wear and corrosion, biocompatibility and osseointegration in the human body. Different surface structures, morphologies and topographies were obtained as revealed by using the x-ray diffraction technique, scanning electron microscopy and atomic force microscopy. The nature of thermal compact oxides was found to be dependent on the temperature and the duration of oxidation, the anatase presents the predominant phase at 500°C, while it disappears at 700°C, where the rutile becomes the predominant phase with the presence of alumina phase. The layers thickness and roughness increase with the temperature and the duration of treatment. Diameters and lengths of anodic nanotubes increase with the increase of applied potentials, nanopores dimensions increase also with the increase of alkalin-hydrothermal treatment duration. All studied surfaces exhibit good wear and corrosion resistance and biocompatibility, as assessed by friction essays, open circuit potential, electrochemical impedance spectroscopy, cyclic polarisation curves and cells culture assays.
Diplôme :	Doctorat en sciences
En ligne :	../theses/physique/BOU7377.pdf
Format de la ressource électronique :	pdf
Permalink :	https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=11026

Titre :	Quelques problËmes en relativité et cosmologie : Théorie d’einstein-cartan comme alternative au problème de la matière sombre, théorie F(R) et transformation de Lorentz à l’échelle macroscopique
Type de document :	texte imprimé
Auteurs :	Amine Benachour, Auteur ; Sami Ryad Zouzou, Directeur de thèse
Editeur :	جامعة الإخوة منتوري قسنطينة
Année de publication :	2018
Importance :	98 f.
Format :	30 cm.
Note générale :	2 copies imprimées disponibles
Langues :	Français (fre)
Tags :	Einstein-Cartan theory  Spherical symmetry  Exact solutions  Mass formula  Dark matter  f(R) theory  Ricci scalar  Common solutions  Lorentz transformation  Length contraction  Thought experiment  Tape measure  Simultaneity  Macroscopic scale  Théorie d’Einstein-Cartan  Symétrie sphérique  Solutions exactes  Formule de masse  Matière sombre  Théorie f(R)  Scalaire de Ricci  Solutions communes  Transformation de Lorentz  Contraction des longueurs  Expérience de pensée  Mètre ruban  Simultanéité  Echelle macroscopique  ????? ???????? ?????  ????? ????  ???? ?????????  ????? ??????  ?????? ???????  ????? f(R)  ???? ????????  ???? ??????  ????? ?????  ???? ???????  ???? ????  ?????
Index. décimale :	530 Physique
Résumé :	Some current issues in cosmology lead us to consider theories of gravitation other than general relativity. It is in this context that this thesis is being taken by considering first the Einstein-Cartan theory for static and spherically symmetric spacetime where obtaining exact solutions has led to a general formula linking the internal mass of an object with spherical symmetry to its external mass, highlighting a difference in mass that would likely to provide an explanation for the dark matter problem in the universe. Another theory of gravitation which has been studied in this thesis often proposed as an alternative to the problem of dark energy; is the f(R) theory where the emphasis has been placed on its close link with general relativity by demonstrating the necessary and sufficient condition for a metric to be a solution of the two theories; whose consequences made possible the construction of f(R) theories equivalent to general relativity for a specific form of the Ricci scalar; and set the conditions on the parameters of a given model to have such equivalence. Finally, following the analysis of a thought experiment involving the measurement of the distance between two observers in motion by a tape measure, certain problems related to the application of the Lorentz transformation at the macroscopic scale have also been investigated and solved.
Diplôme :	Doctorat en sciences
En ligne :	../theses/physique/BEN7376.pdf
Format de la ressource électronique :	pdf
Permalink :	https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=11025

Quelques problËmes en relativité et cosmologie : Théorie d’einstein-cartan comme alternative au problème de la matière sombre, théorie F(R) et transformation de Lorentz à l’échelle macroscopique [texte imprimé] / Amine Benachour, Auteur ; Sami Ryad Zouzou, Directeur de thèse . - [S.l.] : جامعة الإخوة منتوري قسنطينة, 2018 . - 98 f. ; 30 cm.
2 copies imprimées disponibles

Langues : Français (fre)

Tags :	Einstein-Cartan theory  Spherical symmetry  Exact solutions  Mass formula  Dark matter  f(R) theory  Ricci scalar  Common solutions  Lorentz transformation  Length contraction  Thought experiment  Tape measure  Simultaneity  Macroscopic scale  Théorie d’Einstein-Cartan  Symétrie sphérique  Solutions exactes  Formule de masse  Matière sombre  Théorie f(R)  Scalaire de Ricci  Solutions communes  Transformation de Lorentz  Contraction des longueurs  Expérience de pensée  Mètre ruban  Simultanéité  Echelle macroscopique  ????? ???????? ?????  ????? ????  ???? ?????????  ????? ??????  ?????? ???????  ????? f(R)  ???? ????????  ???? ??????  ????? ?????  ???? ???????  ???? ????  ?????
Index. décimale :	530 Physique
Résumé :	Some current issues in cosmology lead us to consider theories of gravitation other than general relativity. It is in this context that this thesis is being taken by considering first the Einstein-Cartan theory for static and spherically symmetric spacetime where obtaining exact solutions has led to a general formula linking the internal mass of an object with spherical symmetry to its external mass, highlighting a difference in mass that would likely to provide an explanation for the dark matter problem in the universe. Another theory of gravitation which has been studied in this thesis often proposed as an alternative to the problem of dark energy; is the f(R) theory where the emphasis has been placed on its close link with general relativity by demonstrating the necessary and sufficient condition for a metric to be a solution of the two theories; whose consequences made possible the construction of f(R) theories equivalent to general relativity for a specific form of the Ricci scalar; and set the conditions on the parameters of a given model to have such equivalence. Finally, following the analysis of a thought experiment involving the measurement of the distance between two observers in motion by a tape measure, certain problems related to the application of the Lorentz transformation at the macroscopic scale have also been investigated and solved.
Diplôme :	Doctorat en sciences
En ligne :	../theses/physique/BEN7376.pdf
Format de la ressource électronique :	pdf
Permalink :	https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=11025

Titre :	Etude phytochimique et pharmacologique de deux plantes appartenant à la famille des Astéraceae et Fabaceae. : Cas de : Onopordum acanthium L. et Spartium junceum L.
Type de document :	texte imprimé
Auteurs :	Sofiane Habibatni, Auteur ; Djamila Zama, Directeur de thèse
Editeur :	جامعة الإخوة منتوري قسنطينة
Année de publication :	2018
Importance :	107 f.
Format :	30 cm.
Note générale :	0 copies imprimées disponibles
Langues :	Français (fre)
Tags :	d’O acanthium  S junceum Extrait BuOH  Activité antioxydante  Activité analgésique  oedémateuse et antipyéritique  O acanthium  Antioxidant activity  Analgesic  edematous and antipyretic activity  S junceum  O acanthium?????? BuOH???? ???? ???????  ???? ????  ?????? ????? ???????
Index. décimale :	570 Sciences de la vie. Biologie
Résumé :	The present work was focused on the phytochemical analytical studies and the evaluation of antioxidant and anti-inflammatory activities including analgesic and antipyretic activity of two plants belonging to asteraceae and fabaceae families namely O. acanthium and S. junceum. The various preparations of O. acanthium are mainly used against hepatic diseases, hemorrhoids, gastric disorders, gynecological diseases and as antipyretic. While those of S. junceum are cardiotonic, cathartic, diuretic, emetic and purgative. Phytochemical analysis of various parts of both the plants revealed the presence of phenols, flavonoïds, saponins, coumarins, tannins and anthraquinones. Onopordum and Spartium acetate extract had shown strongest antioxidant activity analysed with the DPPH test with IC50 values of 16.19 and 24.32 μg / mL respectively.With the ABTS+ radical cation reduction test, the acetate extract of the Onopordum and Spartium ethanolic flowers displayed IC50 values of 23.71 and 23.49 μg / mL respectively. With the ß-carotene bleaching test, the acetate extract and dichloromethane extract of O. acanthium flowers had IC50 equal to 2.51 and 20.77 respectively whereas the acetate extract of S. junceum had IC50 equal to 24.28 μg / mL. With iron reduction test, antioxidant activity of O. acanthium flowers of acetate extract followed by dichloromethane extract with IC50 value 6.48 and 10.08 respectively whereas butanolic extract of S. junceum leaves and acetate extract of S. junceum flowers showed very interesting activity with IC50 value 13.15 and 14.52 respectively. These extracts have the power to reduce Fe. An in-vivo study have shown an analgesic activity for the BuOH extract of the leaves and stems of O acanthium and S junceum respectively, with a notorious power of protection against abdominal cramps, at the dose of 600 mg / kg, after 25 min pretreatment with BuOH extracts of O acanthium and S junceum had a protective effect against pain comparable to that of aspirin at a dose of 500 mg / kg. The results obtained shown that the butanolic extracts of the two plants at the dose of 900 mg / kg had superior anti-inflammatory activity and highly significant to that of aspirin at 500 mg / kg. In addition, the BuOH extract of O acanthium leaves showed an anti-inflammatory and antipyretic effect. These results demonstrates as a starting point for therapeutic applications.
Diplôme :	Doctorat en sciences
En ligne :	../theses/biologie/HAB7375.pdf
Format de la ressource électronique :	pdf
Permalink :	https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=11024

Etude phytochimique et pharmacologique de deux plantes appartenant à la famille des Astéraceae et Fabaceae. : Cas de : Onopordum acanthium L. et Spartium junceum L. [texte imprimé] / Sofiane Habibatni, Auteur ; Djamila Zama, Directeur de thèse . - [S.l.] : جامعة الإخوة منتوري قسنطينة, 2018 . - 107 f. ; 30 cm.
0 copies imprimées disponibles

Langues : Français (fre)

Tags :	d’O acanthium  S junceum Extrait BuOH  Activité antioxydante  Activité analgésique  oedémateuse et antipyéritique  O acanthium  Antioxidant activity  Analgesic  edematous and antipyretic activity  S junceum  O acanthium?????? BuOH???? ???? ???????  ???? ????  ?????? ????? ???????
Index. décimale :	570 Sciences de la vie. Biologie
Résumé :	The present work was focused on the phytochemical analytical studies and the evaluation of antioxidant and anti-inflammatory activities including analgesic and antipyretic activity of two plants belonging to asteraceae and fabaceae families namely O. acanthium and S. junceum. The various preparations of O. acanthium are mainly used against hepatic diseases, hemorrhoids, gastric disorders, gynecological diseases and as antipyretic. While those of S. junceum are cardiotonic, cathartic, diuretic, emetic and purgative. Phytochemical analysis of various parts of both the plants revealed the presence of phenols, flavonoïds, saponins, coumarins, tannins and anthraquinones. Onopordum and Spartium acetate extract had shown strongest antioxidant activity analysed with the DPPH test with IC50 values of 16.19 and 24.32 μg / mL respectively.With the ABTS+ radical cation reduction test, the acetate extract of the Onopordum and Spartium ethanolic flowers displayed IC50 values of 23.71 and 23.49 μg / mL respectively. With the ß-carotene bleaching test, the acetate extract and dichloromethane extract of O. acanthium flowers had IC50 equal to 2.51 and 20.77 respectively whereas the acetate extract of S. junceum had IC50 equal to 24.28 μg / mL. With iron reduction test, antioxidant activity of O. acanthium flowers of acetate extract followed by dichloromethane extract with IC50 value 6.48 and 10.08 respectively whereas butanolic extract of S. junceum leaves and acetate extract of S. junceum flowers showed very interesting activity with IC50 value 13.15 and 14.52 respectively. These extracts have the power to reduce Fe. An in-vivo study have shown an analgesic activity for the BuOH extract of the leaves and stems of O acanthium and S junceum respectively, with a notorious power of protection against abdominal cramps, at the dose of 600 mg / kg, after 25 min pretreatment with BuOH extracts of O acanthium and S junceum had a protective effect against pain comparable to that of aspirin at a dose of 500 mg / kg. The results obtained shown that the butanolic extracts of the two plants at the dose of 900 mg / kg had superior anti-inflammatory activity and highly significant to that of aspirin at 500 mg / kg. In addition, the BuOH extract of O acanthium leaves showed an anti-inflammatory and antipyretic effect. These results demonstrates as a starting point for therapeutic applications.
Diplôme :	Doctorat en sciences
En ligne :	../theses/biologie/HAB7375.pdf
Format de la ressource électronique :	pdf
Permalink :	https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=11024

Titre :	Les interactions fonctionnelles des flavonoïdes de l’extrait butanolique de la plante Heliotropium undulatum vis-à-vis des mécanismes de l’hépatoxicité de l’hydrazine chez le rat.
Type de document :	texte imprimé
Auteurs :	Ouafa Deffa, Auteur ; Souad Ameddah, Directeur de thèse ; Ratiba Mekkiou, Directeur de thèse
Editeur :	جامعة الإخوة منتوري قسنطينة
Année de publication :	2018
Importance :	127 f.
Format :	30 cm.
Note générale :	2 copies imprimées disponibles
Langues :	Français (fre)
Tags :	Heliotropium undulatum  Hydrazine  Foie Stress oxydant  Inflammation  Cyp2E1  Mitochondrie  HPLC/MS  liver  Oxidative stress  Mitochondria  ??????????  ?????  ???????  ????????  ????????????
Index. décimale :	570 Sciences de la vie. Biologie
Résumé :	The work presented in this thesis contributes to the valorization of the aerial part of an endemic plant collected from the Algerian Sahara, Heliotropium undulatum Vahl (the family Boraginaceae). This study was conducted to evaluate the antioxidant and antiinflammatory activities of n-BuOH extracts of stems and leaves of H. undulatum using a rat- hydrazine model. In vitro studies (DPPH°, Chelation, FRAP, °OH) reveal that the n-BuOH extract of leaves has an antioxidant property. In vivo studies have also shown that the n-BuOH extract of 200 mg/kg leaves has demonstrated hepatoprotective activity by preserving liver function, modulating CYP2E1, neutralizing hepatic oxidative stress, and providing intra- mitochondrial redox status exhibited during treatment with hydrazine (300 mg/kg). The antiinflammatory activity was better pronounced by the n-BuOH extract of the stems, the demonstration of which is carried out using various in vitro tests (denaturation of albumin, HRBC, NO° scavenger). The study of modulatory pathways (hepatic carbonyl proteins, MPO, levels of NO, IL-ip and TNF-a) confirmed the in vivo anti-inflammatory potential of the n- BuOH extract of stems. The set of concomitant antioxidant and anti-inflammatory mechanisms characterizing the two extracts of Heliotropiuin undulatum is correlated with the qualitative and quantitative nature of the phenolic acids and flavonoids revealed via HPLC- MASS analysis and with the synergetic effect of all the phytoconstituents contained in this plant
Diplôme :	Doctorat en sciences
En ligne :	../theses/biologie/DEF7374.pdf
Format de la ressource électronique :	pdf
Permalink :	https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=11023

Les interactions fonctionnelles des flavonoïdes de l’extrait butanolique de la plante Heliotropium undulatum vis-à-vis des mécanismes de l’hépatoxicité de l’hydrazine chez le rat. [texte imprimé] / Ouafa Deffa, Auteur ; Souad Ameddah, Directeur de thèse ; Ratiba Mekkiou, Directeur de thèse . - [S.l.] : جامعة الإخوة منتوري قسنطينة, 2018 . - 127 f. ; 30 cm.
2 copies imprimées disponibles

Langues : Français (fre)

Tags :	Heliotropium undulatum  Hydrazine  Foie Stress oxydant  Inflammation  Cyp2E1  Mitochondrie  HPLC/MS  liver  Oxidative stress  Mitochondria  ??????????  ?????  ???????  ????????  ????????????
Index. décimale :	570 Sciences de la vie. Biologie
Résumé :	The work presented in this thesis contributes to the valorization of the aerial part of an endemic plant collected from the Algerian Sahara, Heliotropium undulatum Vahl (the family Boraginaceae). This study was conducted to evaluate the antioxidant and antiinflammatory activities of n-BuOH extracts of stems and leaves of H. undulatum using a rat- hydrazine model. In vitro studies (DPPH°, Chelation, FRAP, °OH) reveal that the n-BuOH extract of leaves has an antioxidant property. In vivo studies have also shown that the n-BuOH extract of 200 mg/kg leaves has demonstrated hepatoprotective activity by preserving liver function, modulating CYP2E1, neutralizing hepatic oxidative stress, and providing intra- mitochondrial redox status exhibited during treatment with hydrazine (300 mg/kg). The antiinflammatory activity was better pronounced by the n-BuOH extract of the stems, the demonstration of which is carried out using various in vitro tests (denaturation of albumin, HRBC, NO° scavenger). The study of modulatory pathways (hepatic carbonyl proteins, MPO, levels of NO, IL-ip and TNF-a) confirmed the in vivo anti-inflammatory potential of the n- BuOH extract of stems. The set of concomitant antioxidant and anti-inflammatory mechanisms characterizing the two extracts of Heliotropiuin undulatum is correlated with the qualitative and quantitative nature of the phenolic acids and flavonoids revealed via HPLC- MASS analysis and with the synergetic effect of all the phytoconstituents contained in this plant
Diplôme :	Doctorat en sciences
En ligne :	../theses/biologie/DEF7374.pdf
Format de la ressource électronique :	pdf
Permalink :	https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=11023