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Partager le résultat de cette recherche Interroger des sources externesCaractérisations des réactions interfaciales dans les couches minces métalliques binaires et multiples / Farida Kezai (Née Medjani)
Titre : Caractérisations des réactions interfaciales dans les couches minces métalliques binaires et multiples Type de document : texte imprimé Auteurs : Farida Kezai (Née Medjani) ; Université Mentouri, Editeur scientifique ; Rachid Halimi, Directeur de thèse Année de publication : 2007 Importance : 89 f. Note générale : 01 Disponible à la salle de recherche 02 Disponibles au magazin de la B.U.C. 01 CD Langues : Français (fre) Tags : Pulvérisation Morphologie Multicouches TiN/AlN Nanocomposite Propriétés structurales Résistivité électrique Nanodureté Sputtering Multilayers TiN/AlN Zr-Si-N Structural proprieties Morphology Electrical resistivity Nanohardness Index. décimale : 530 Physique Résumé : DC reactive magnetron co-sputtering was used for the deposition of Zr-Si-N thin films and a multilayers TiN/AlN.
Si content (CSi) was varied by changing the power applied on the Si target, whereas that on Zr target was kept constant. Four series of samples have been deposited at various substrate temperatures: room temperature, 240 °C, 440 °C and 640 °C. The evolution of morphology,
crystalline structure, grain size and lattice constant has been investigated by X-ray diffraction analyses. Nanohardness, stress and resistivity measurements provide complementary information, which validate the proposed 3-step model for the film formation of the Zr-Si-N system deposited by reactive magnetron cosputtering. For low Si content the Si atoms substitute the Zr atoms in the ZrN lattice. Above the solubility limit, a nanocomposite film containing ZrN:Si nanocrystallites and amorphous SiNy is formed. Further increase of Si content results in a reduction of grain size (D), while the thickness of the SiNy layer at the crystallite surface remains constant. The increasing amount of the SiNy amorphous phase in the films is realized by increasing the surface to volume ratio of the crystallites. In this concentration range, the size of the crystallites in the Zr-Si-N films decreases according to the relationship CSi ~1/D. With
increasing the substrate temperature, the solubility limit of Si in ZrN decreases whereas the films’ global nitruration (CN /(CSi + CZr)) increases. The concentration dependence of the electrical resistivity is interpreted in terms of the variation of the SiNy layer thickness.
By controlling the thickness of individual layers (1-50 nm) and substrate bias (Vb = -25 V and V b = - 100V) two series of samples were prepared. The films were characterized using X-ray diffraction (DRX), cross-sectional electron microscopy (MET) and nanoindentation. The
measured hardness of multilayer films were found to be always higher than the rule of the mixture, but the magnitude of hardness enhancement was found to be dependent on the bilayer thickness and bias substrate. Decreasing progressively the layer thickness favors the alignment of
(0002) basal plan of w-AlN on (111) plane of TiN, and results in the development of strong (111) texture, prerequisite for stabilization of c-AlN and formation of epitaxial coherent structures.Diplôme : Doctorat En ligne : ../theses/physique/KEZ5008.pdf Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=3347 Caractérisations des réactions interfaciales dans les couches minces métalliques binaires et multiples [texte imprimé] / Farida Kezai (Née Medjani) ; Université Mentouri, Editeur scientifique ; Rachid Halimi, Directeur de thèse . - 2007 . - 89 f.
01 Disponible à la salle de recherche 02 Disponibles au magazin de la B.U.C. 01 CD
Langues : Français (fre)
Tags : Pulvérisation Morphologie Multicouches TiN/AlN Nanocomposite Propriétés structurales Résistivité électrique Nanodureté Sputtering Multilayers TiN/AlN Zr-Si-N Structural proprieties Morphology Electrical resistivity Nanohardness Index. décimale : 530 Physique Résumé : DC reactive magnetron co-sputtering was used for the deposition of Zr-Si-N thin films and a multilayers TiN/AlN.
Si content (CSi) was varied by changing the power applied on the Si target, whereas that on Zr target was kept constant. Four series of samples have been deposited at various substrate temperatures: room temperature, 240 °C, 440 °C and 640 °C. The evolution of morphology,
crystalline structure, grain size and lattice constant has been investigated by X-ray diffraction analyses. Nanohardness, stress and resistivity measurements provide complementary information, which validate the proposed 3-step model for the film formation of the Zr-Si-N system deposited by reactive magnetron cosputtering. For low Si content the Si atoms substitute the Zr atoms in the ZrN lattice. Above the solubility limit, a nanocomposite film containing ZrN:Si nanocrystallites and amorphous SiNy is formed. Further increase of Si content results in a reduction of grain size (D), while the thickness of the SiNy layer at the crystallite surface remains constant. The increasing amount of the SiNy amorphous phase in the films is realized by increasing the surface to volume ratio of the crystallites. In this concentration range, the size of the crystallites in the Zr-Si-N films decreases according to the relationship CSi ~1/D. With
increasing the substrate temperature, the solubility limit of Si in ZrN decreases whereas the films’ global nitruration (CN /(CSi + CZr)) increases. The concentration dependence of the electrical resistivity is interpreted in terms of the variation of the SiNy layer thickness.
By controlling the thickness of individual layers (1-50 nm) and substrate bias (Vb = -25 V and V b = - 100V) two series of samples were prepared. The films were characterized using X-ray diffraction (DRX), cross-sectional electron microscopy (MET) and nanoindentation. The
measured hardness of multilayer films were found to be always higher than the rule of the mixture, but the magnitude of hardness enhancement was found to be dependent on the bilayer thickness and bias substrate. Decreasing progressively the layer thickness favors the alignment of
(0002) basal plan of w-AlN on (111) plane of TiN, and results in the development of strong (111) texture, prerequisite for stabilization of c-AlN and formation of epitaxial coherent structures.Diplôme : Doctorat En ligne : ../theses/physique/KEZ5008.pdf Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=3347 Exemplaires
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Titre : Caractéristiques marpho fonctionnelles des enfants sédentaires (filles et garçons) âgés de 13-15 ans du sud est Algérien commune de Biskra. Type de document : texte imprimé Auteurs : Abdelmalek Mellem ; Abdellah Bahri, Directeur de thèse ; Université Metouri, Editeur scientifique Année de publication : 2008 Importance : 93 f. Note générale : 01 disponible dans la salle de recherche
02 disponibles au magasin de la bibliothèque centraleLangues : Français (fre) Tags : Anaérobie alactique Morphologie Anaérobie lactique Aérobie Morphology Aerobe Anaerobe alactic Lactic Anaerobie. Puberty Age ????????? ?????? ????????? ?????? ?????????? ?????? ????? Index. décimale : 790 Loisirs et arts du spectacle Résumé : The aim of this investigation which is essentially description was to present in details the functional morphology characteristics of girls and boys according to their chronological age.
For that purpose, 200 children (99 boys and 101 girls ) aged between 13 and 15 , who study in middle schools in Biskra and don’t practise out – of- school sports activities , accepted to follow us in our researches during one school year .
they were divided into three groups taking into consideration the age and the sex . Measurement represented in height, weight and biceps, thighs, calves perimeters. in addition to calculations of the meagre weigh and fot heap percentage singe an indirect method :the cuttaneous pleats (durin and col 1974).the aerobe capacity l was determined indirectly by ( Leger and coll .1983). The anaerobe power by a race – track test of 45 m with 13m spring (Mathiewes and Fox 1976). The anaerobe capacity by a side leap test (song 1982). The results show that the quasi- totality of the boys morphological signs have significantly developed with a speeding up of a quick growing (age 13-15) . Whereas for the girls, the anthropometric signs were less significant from 13 to 15 years old and a soling- down of growth was remarks. The boy’s vo2 max had progressed in a non – significant manner with a relative flatting from 13to15 years old. But for girls it had significantly decreased during the same lapse . so , the vo2 max values of our boys are below norms for all ages whereas those of our girls correspond to the norms. Moreover, we remark an absence of a significant correlation of the vo2 max with the majority of morphological signs for both sexes.
The anaerobe capacity decreased significantly from 13-15 the values, set down , remain below normes presented by the author of this test (song 1982) .
The anaerobe power values observed in both girls and boys are scarcely avenage we remark also a significant correlation of the anaerobic capacity and anaerobic power with the majority of morphological signs especially weight, meagre weight and height .
The assessment of the morphological and functional characteristics of a sedentary population on open growth is very important to us. It would be benefit to follow our investigations on sportswomen in order to determine the influence of practising different sports on our children’s growth in the course of puberty.Diplôme : Magistère En ligne : ../theses/sport/MAL5197.pdf Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=5340 Caractéristiques marpho fonctionnelles des enfants sédentaires (filles et garçons) âgés de 13-15 ans du sud est Algérien commune de Biskra. [texte imprimé] / Abdelmalek Mellem ; Abdellah Bahri, Directeur de thèse ; Université Metouri, Editeur scientifique . - 2008 . - 93 f.
01 disponible dans la salle de recherche
02 disponibles au magasin de la bibliothèque centrale
Langues : Français (fre)
Tags : Anaérobie alactique Morphologie Anaérobie lactique Aérobie Morphology Aerobe Anaerobe alactic Lactic Anaerobie. Puberty Age ????????? ?????? ????????? ?????? ?????????? ?????? ????? Index. décimale : 790 Loisirs et arts du spectacle Résumé : The aim of this investigation which is essentially description was to present in details the functional morphology characteristics of girls and boys according to their chronological age.
For that purpose, 200 children (99 boys and 101 girls ) aged between 13 and 15 , who study in middle schools in Biskra and don’t practise out – of- school sports activities , accepted to follow us in our researches during one school year .
they were divided into three groups taking into consideration the age and the sex . Measurement represented in height, weight and biceps, thighs, calves perimeters. in addition to calculations of the meagre weigh and fot heap percentage singe an indirect method :the cuttaneous pleats (durin and col 1974).the aerobe capacity l was determined indirectly by ( Leger and coll .1983). The anaerobe power by a race – track test of 45 m with 13m spring (Mathiewes and Fox 1976). The anaerobe capacity by a side leap test (song 1982). The results show that the quasi- totality of the boys morphological signs have significantly developed with a speeding up of a quick growing (age 13-15) . Whereas for the girls, the anthropometric signs were less significant from 13 to 15 years old and a soling- down of growth was remarks. The boy’s vo2 max had progressed in a non – significant manner with a relative flatting from 13to15 years old. But for girls it had significantly decreased during the same lapse . so , the vo2 max values of our boys are below norms for all ages whereas those of our girls correspond to the norms. Moreover, we remark an absence of a significant correlation of the vo2 max with the majority of morphological signs for both sexes.
The anaerobe capacity decreased significantly from 13-15 the values, set down , remain below normes presented by the author of this test (song 1982) .
The anaerobe power values observed in both girls and boys are scarcely avenage we remark also a significant correlation of the anaerobic capacity and anaerobic power with the majority of morphological signs especially weight, meagre weight and height .
The assessment of the morphological and functional characteristics of a sedentary population on open growth is very important to us. It would be benefit to follow our investigations on sportswomen in order to determine the influence of practising different sports on our children’s growth in the course of puberty.Diplôme : Magistère En ligne : ../theses/sport/MAL5197.pdf Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=5340 Exemplaires
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Titre : Approche ostéo-morphométrique des têtes de la population ovine autochtone Type de document : texte imprimé Auteurs : Kenza Ami, Auteur ; Faiza Tekkouk (Née Zemmouchi), Directeur de thèse Editeur : constantine [Algérie] : Université Constantine 1 Année de publication : 2014 Importance : 148 f. Format : 30 cm. Note générale : 2 copies imprimées disponibles Langues : Français (fre) Tags : ostéométrie morphologie crâne mandibule Ovin osteometry morphology skull mandible Sheep ???? ?????? ?????????? ????? ??? Index. décimale : 636 Sciences Vétérinaires Résumé :
This study is the first study conducted on the morphological and ostéométriques characterization of kulls sheep in Algeria. It was worn on twenty-six quantitative variables and thirty-two qualitative variables for a sample of 30 heads (15 males and 15 females). There is a perfect agreement between the results of the qualitative and quantitative study, they show the presence of two major morph type of skull (thin and thick), more heads that bring some characteristics of the first and more of the second type, These results show that the diversity of sheep even affects his bone morphology, and that it also differs from his age group to another and from one sex to the other. So it gives us an assisted about the heterogeneity of herds, and about the existence of uncontrolled croisements between individuals of different races or cross breeding individuals.Diplôme : Magistère En ligne : ../theses/veterinaire/AMI6445.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=9479 Approche ostéo-morphométrique des têtes de la population ovine autochtone [texte imprimé] / Kenza Ami, Auteur ; Faiza Tekkouk (Née Zemmouchi), Directeur de thèse . - constantine (Route ain el bey, Algérie) : Université Constantine 1, 2014 . - 148 f. ; 30 cm.
2 copies imprimées disponibles
Langues : Français (fre)
Tags : ostéométrie morphologie crâne mandibule Ovin osteometry morphology skull mandible Sheep ???? ?????? ?????????? ????? ??? Index. décimale : 636 Sciences Vétérinaires Résumé :
This study is the first study conducted on the morphological and ostéométriques characterization of kulls sheep in Algeria. It was worn on twenty-six quantitative variables and thirty-two qualitative variables for a sample of 30 heads (15 males and 15 females). There is a perfect agreement between the results of the qualitative and quantitative study, they show the presence of two major morph type of skull (thin and thick), more heads that bring some characteristics of the first and more of the second type, These results show that the diversity of sheep even affects his bone morphology, and that it also differs from his age group to another and from one sex to the other. So it gives us an assisted about the heterogeneity of herds, and about the existence of uncontrolled croisements between individuals of different races or cross breeding individuals.Diplôme : Magistère En ligne : ../theses/veterinaire/AMI6445.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=9479 Exemplaires
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Titre : Elaboration des films minces d’oxyde de Zinc par evaporation et par pulverisation magnetron et etude de leurs proprietes Type de document : texte imprimé Auteurs : Noua Bouhssira, Auteur ; Mohamed Salah Aida, Directeur de thèse Editeur : constantine [Algérie] : Université Constantine 1 Année de publication : 2013 Importance : 120 f. Format : 30 cm. Note générale : 2 copies imprimées disponibles Langues : Français (fre) Tags : thin film ZnO structure morphology photoluminescence conductivity nano rode couche mince morphologie conductivité ??????? ??????? ????? ????? ?????? ????? ???? ???????? ???????? ?????????. Index. décimale : 530 Physique Résumé : Zinc oxide (ZnO) is direct wide band gap semiconductor (3.37 eV) with many interesting properties (structural, morphological, optical, electric, …). A wide range of applications makes it one of the most studied materials in the past decade.
In this research, we prepared by magnetron sputtering and thermal evaporation of thin layers of zinc oxide. In the first method of this work we deposited layers from a ZnO powder to study the influence of annealing temperature in the range from 2 hours to 6 hours on the structural properties of the films. While the second method, ZnO films were prepared from metallic Zn, and the influence of thermal annealing and annealing time on the structural, morphological, optical and electrical properties is the goal of this work.
These layers are transparent, and an electric conductivity with a semiconductor n-type nature, the structure has a hexagonal wurtzite type with a preferential orientation along the axis (002). The morphology of these layers indicates the presence of nano rodes.Diplôme : Doctorat en sciences En ligne : ../theses/physique/BOU6478.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=9523 Elaboration des films minces d’oxyde de Zinc par evaporation et par pulverisation magnetron et etude de leurs proprietes [texte imprimé] / Noua Bouhssira, Auteur ; Mohamed Salah Aida, Directeur de thèse . - constantine (Route ain el bey, Algérie) : Université Constantine 1, 2013 . - 120 f. ; 30 cm.
2 copies imprimées disponibles
Langues : Français (fre)
Tags : thin film ZnO structure morphology photoluminescence conductivity nano rode couche mince morphologie conductivité ??????? ??????? ????? ????? ?????? ????? ???? ???????? ???????? ?????????. Index. décimale : 530 Physique Résumé : Zinc oxide (ZnO) is direct wide band gap semiconductor (3.37 eV) with many interesting properties (structural, morphological, optical, electric, …). A wide range of applications makes it one of the most studied materials in the past decade.
In this research, we prepared by magnetron sputtering and thermal evaporation of thin layers of zinc oxide. In the first method of this work we deposited layers from a ZnO powder to study the influence of annealing temperature in the range from 2 hours to 6 hours on the structural properties of the films. While the second method, ZnO films were prepared from metallic Zn, and the influence of thermal annealing and annealing time on the structural, morphological, optical and electrical properties is the goal of this work.
These layers are transparent, and an electric conductivity with a semiconductor n-type nature, the structure has a hexagonal wurtzite type with a preferential orientation along the axis (002). The morphology of these layers indicates the presence of nano rodes.Diplôme : Doctorat en sciences En ligne : ../theses/physique/BOU6478.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=9523 Exemplaires
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Titre : Diversité génétique de l'espèce Aegilops geniculata Roth en Algérie par approches morphologique, biochimique et moléculaire Type de document : texte imprimé Auteurs : Asma Medouri, Auteur ; Douadi Khelifi, Directeur de thèse Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2016 Importance : 132 f. Format : 30 cm. Note générale : 2 copies imprimées disponibles
Langues : Français (fre) Tags : Aegilops geniculata Accession Algérie Diversité Morphologie Gluténines Gliadines RAPD Algeria Diversity Morphology Glutenins Gliadins ??????? ???? ?????? ??????? ?????????? ???????? Index. décimale : 570 Sciences de la vie. Biologie Résumé : The study of genetic diversity in a collection of the allotetraploid species Aegilops geniculata Roth(UM) collected in Algeria was assessed using morphological, biochemical and molecular approaches.
This was carried on a wide sampling following a climatic gradient throughout North Algeria. This estimation was preceded by assessing the genetic variability of the diploid progenitors of the tetraploid species (Ae. comosa and Ae. umbellulata) based on gluten proteins. For diploids, a significant variation
was revealed for the three classes of gluten proteins. Several new alleles corresponding to HMW-GS were identified and a nomenclature was proposed as: 8 alleles were found at the Glu-M1 locus (with 5 new alleles) and 3 alleles (with one new) at the Glu-U1 locus. For LMW-GS (B- zone), 14 and 7 alleles were revealed at Glu-M3 and Glu-U3 loci respectively. For gliadins, a typology was established.
Morphological diversity of Ae. geniculata was estimated using 15 descriptors. Individuals were morphologically homogenous and little differences were found between accessions. Results of PCA reveal that traits expressing the wide of the spike distinguished better between accessions. Biochemical analysis of glutenins showed a high level of polymorphism as; 15 alleles were recognized at the GluM1 locus and 12 at the Glu-U1 locus with a new subunit and several new alleles. For B-LMW-GS,
the locus Glu-M3 expressed 28 alleles and the locus Glu-U3 expressed 25 alleles. Thirty-two specific patterns were revealed for C-LMW-GS. With respect to gliadins, 61 polymorphic bands resulting in 35 gliadin blocks were found. The genetic diversity index indicated that ω-gliadins were the most polymorphic, followed by γ- and β-gliadin then α-gliadins. Molecular data based on RAPD showed a high polymorphism as 145 fragments were detected with a level of polymorphism of 79.31%.
The three studied approaches (morphology, proteins and DNA polymorphism) showed relationships between genetic variation of the accessions and ecogeographic conditions. Correlation between morphology and some climatic factors showed that some independent characters were correlated with the winter minimum temperature. The polymorphism detected in gliadins highlighted a strong correlation between ecogeographic parameters and some ω-gliadin bands especially the band B14.
RAPD polymorphism showed a strong correlation with ecological parameters."
Diplôme : Doctorat En ligne : ../theses/biologie/MED6917.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=10269 Diversité génétique de l'espèce Aegilops geniculata Roth en Algérie par approches morphologique, biochimique et moléculaire [texte imprimé] / Asma Medouri, Auteur ; Douadi Khelifi, Directeur de thèse . - [S.l.] : جامعة الإخوة منتوري قسنطينة, 2016 . - 132 f. ; 30 cm.
2 copies imprimées disponibles
Langues : Français (fre)
Tags : Aegilops geniculata Accession Algérie Diversité Morphologie Gluténines Gliadines RAPD Algeria Diversity Morphology Glutenins Gliadins ??????? ???? ?????? ??????? ?????????? ???????? Index. décimale : 570 Sciences de la vie. Biologie Résumé : The study of genetic diversity in a collection of the allotetraploid species Aegilops geniculata Roth(UM) collected in Algeria was assessed using morphological, biochemical and molecular approaches.
This was carried on a wide sampling following a climatic gradient throughout North Algeria. This estimation was preceded by assessing the genetic variability of the diploid progenitors of the tetraploid species (Ae. comosa and Ae. umbellulata) based on gluten proteins. For diploids, a significant variation
was revealed for the three classes of gluten proteins. Several new alleles corresponding to HMW-GS were identified and a nomenclature was proposed as: 8 alleles were found at the Glu-M1 locus (with 5 new alleles) and 3 alleles (with one new) at the Glu-U1 locus. For LMW-GS (B- zone), 14 and 7 alleles were revealed at Glu-M3 and Glu-U3 loci respectively. For gliadins, a typology was established.
Morphological diversity of Ae. geniculata was estimated using 15 descriptors. Individuals were morphologically homogenous and little differences were found between accessions. Results of PCA reveal that traits expressing the wide of the spike distinguished better between accessions. Biochemical analysis of glutenins showed a high level of polymorphism as; 15 alleles were recognized at the GluM1 locus and 12 at the Glu-U1 locus with a new subunit and several new alleles. For B-LMW-GS,
the locus Glu-M3 expressed 28 alleles and the locus Glu-U3 expressed 25 alleles. Thirty-two specific patterns were revealed for C-LMW-GS. With respect to gliadins, 61 polymorphic bands resulting in 35 gliadin blocks were found. The genetic diversity index indicated that ω-gliadins were the most polymorphic, followed by γ- and β-gliadin then α-gliadins. Molecular data based on RAPD showed a high polymorphism as 145 fragments were detected with a level of polymorphism of 79.31%.
The three studied approaches (morphology, proteins and DNA polymorphism) showed relationships between genetic variation of the accessions and ecogeographic conditions. Correlation between morphology and some climatic factors showed that some independent characters were correlated with the winter minimum temperature. The polymorphism detected in gliadins highlighted a strong correlation between ecogeographic parameters and some ω-gliadin bands especially the band B14.
RAPD polymorphism showed a strong correlation with ecological parameters."
Diplôme : Doctorat En ligne : ../theses/biologie/MED6917.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=10269 Exemplaires
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