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Partager le résultat de cette recherche Interroger des sources externesRecherches théoriques et expérimentales sur les spectres Raman induits par les impuretés dans les cristaux cubiques d'oxydes alcalino-terreux / Alain Billat
Titre : Recherches théoriques et expérimentales sur les spectres Raman induits par les impuretés dans les cristaux cubiques d'oxydes alcalino-terreux Type de document : texte imprimé Auteurs : Alain Billat ; L. Bernard, Directeur de thèse ; Université de Reims, Editeur scientifique Année de publication : 1978 Importance : 269 f. Note générale : 01 Disponible au magazin de la B.U.C. Langues : Français (fre) Tags : Spectroscopie Oxyde Raman Index. décimale : 530 Physique Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=3269 Recherches théoriques et expérimentales sur les spectres Raman induits par les impuretés dans les cristaux cubiques d'oxydes alcalino-terreux [texte imprimé] / Alain Billat ; L. Bernard, Directeur de thèse ; Université de Reims, Editeur scientifique . - 1978 . - 269 f.
01 Disponible au magazin de la B.U.C.
Langues : Français (fre)
Tags : Spectroscopie Oxyde Raman Index. décimale : 530 Physique Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=3269 Exemplaires
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Titre : Diffusion Raman anti-Stokes cohérente au voisinage des résonances électroniques et réalisation d'un montage experimental Type de document : texte imprimé Auteurs : Sylvie Annette Jeanne Druet (Née Caumartin) ; Université de Paris-sud, Editeur scientifique ; M. Taran, Directeur de thèse Année de publication : 1976 Importance : 72 p. Note générale : 01 Disponible au magazin de la B.U.C. Langues : Français (fre) Tags : Diffusion Raman Résonance électronique Montage expérimental Index. décimale : 530 Physique Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=3316 Diffusion Raman anti-Stokes cohérente au voisinage des résonances électroniques et réalisation d'un montage experimental [texte imprimé] / Sylvie Annette Jeanne Druet (Née Caumartin) ; Université de Paris-sud, Editeur scientifique ; M. Taran, Directeur de thèse . - 1976 . - 72 p.
01 Disponible au magazin de la B.U.C.
Langues : Français (fre)
Tags : Diffusion Raman Résonance électronique Montage expérimental Index. décimale : 530 Physique Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=3316 Exemplaires
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Titre : Structure et spectroscopie (IR, Raman et neutron) des molécules aromatiques encagées dans des dérivés de triazines Type de document : texte imprimé Auteurs : Meriem Medjani, Auteur ; Ali Boudjada, Directeur de thèse Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2018 Importance : 196 f. Format : 30 cm. Note générale : 2 copies imprimées disponibles
Langues : Français (fre) Tags : diffraction des rayons X DFT spectroscopie IR Raman effet tunnel INS X-ray diffraction IR spectroscopy tunneling ?????? ?????? ??????? DFT ??? ?????? ??? ??????? ????? ????? ????? Index. décimale : 530 Physique Résumé : Our thesis was dedicated to systematically extend recent observations indicating that the molecular conformation and certain modes of vibration of the 4,6-dichloro-5-methylpyrimidine (4,6dC5MP), 3,5-dibromo-4- methylpyridine (3,5dB4MPn) and 2,4,6-Collidine encaged in the BrPOT from X-ray diffraction at ambient temperature.
Hirschfield’s surface analysis is generated through the Crystal Explorer program, providing information on the existing interactions in the structure of both products and helping to view and understand its crystalline stack.
In parallel to the experimental study, we made theoretical calculations of the conformation of the single molecule using the methods of the DFT (Density Functional Theory) well known for their precision and normal modes of vibration.
The results of calculation of quantum mechanics made by (DFT) with the functional MPW1PW91 and Lanl2DZ base led to similar results in the angles and bond lengths in relation to the experiment.
The theoretical calculations of spectroscopy allowed the identification of the different modes of vibration of the molecule.
The inelastic neutron scattering (INS) technique was used to study the tunneling effect of the methyl group of collidine encaged, and tunnel burstings were measured. These values correspond to the generator potential.
Diplôme : Doctorat En ligne : ../theses/physique/MED7301.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=10916 Structure et spectroscopie (IR, Raman et neutron) des molécules aromatiques encagées dans des dérivés de triazines [texte imprimé] / Meriem Medjani, Auteur ; Ali Boudjada, Directeur de thèse . - [S.l.] : جامعة الإخوة منتوري قسنطينة, 2018 . - 196 f. ; 30 cm.
2 copies imprimées disponibles
Langues : Français (fre)
Tags : diffraction des rayons X DFT spectroscopie IR Raman effet tunnel INS X-ray diffraction IR spectroscopy tunneling ?????? ?????? ??????? DFT ??? ?????? ??? ??????? ????? ????? ????? Index. décimale : 530 Physique Résumé : Our thesis was dedicated to systematically extend recent observations indicating that the molecular conformation and certain modes of vibration of the 4,6-dichloro-5-methylpyrimidine (4,6dC5MP), 3,5-dibromo-4- methylpyridine (3,5dB4MPn) and 2,4,6-Collidine encaged in the BrPOT from X-ray diffraction at ambient temperature.
Hirschfield’s surface analysis is generated through the Crystal Explorer program, providing information on the existing interactions in the structure of both products and helping to view and understand its crystalline stack.
In parallel to the experimental study, we made theoretical calculations of the conformation of the single molecule using the methods of the DFT (Density Functional Theory) well known for their precision and normal modes of vibration.
The results of calculation of quantum mechanics made by (DFT) with the functional MPW1PW91 and Lanl2DZ base led to similar results in the angles and bond lengths in relation to the experiment.
The theoretical calculations of spectroscopy allowed the identification of the different modes of vibration of the molecule.
The inelastic neutron scattering (INS) technique was used to study the tunneling effect of the methyl group of collidine encaged, and tunnel burstings were measured. These values correspond to the generator potential.
Diplôme : Doctorat En ligne : ../theses/physique/MED7301.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=10916 Exemplaires
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Titre : Elaboration et caractérisation de nanocomposites hybrides : Oxydes métalliques/polymères Type de document : texte imprimé Auteurs : Bariza Troudi, Auteur ; Ouahiba Halimi, Directeur de thèse Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2017 Importance : 121 f. Format : 30 cm. Note générale : 2 copies imprimées disponibles
Langues : Français (fre) Tags : Synthèse hydrothermale Nanocomposites Films minces CuO/PS CuO/PVC PbO/PS PbO/PVC DRX FT-IR Raman AFM Absorption UV-Visible photoluminescence Hydrothermal synthesis thin films UV-Visible Absorption ?????? ?????? ????? ????? ???????? ??? ????????- ???? ???????? ?????? Index. décimale : 530 Physique Résumé : Thin films of metal oxides/polymers nanocomposites were deposited on glass substrates by Spin-Coating and Dip-Coating techniques. The nanocomposites were elaborated by inserting, in the matrices of polystyrene (PS) and polyvinyl chloride (PVC) polymers, of nanoparticles of metal oxides such as copper oxide (CuO) and lead oxide (PbO). The nanoparticles of semiconductor CuO and PbO were synthesized beforehand by the hydrothermal method. The xray diffraction characterization of the obtained powders have revealed a monoclinic phase for CuO crystallites and an orthorhombic phase for PbO. The size of the crystallites of the two semiconductors is of a nanometic order. Calcul the of gap energy indicate a shift towards high energies compared to massive crystals. This shift is due to the effect of the quantum confinement induced by the nanometric size of the crystallites of the semiconductors. These nanocrystals are used for the preparation of the nanocomposites of CuO/PS, CuO/PVC, PbO/PS and PbO/PVC by
simple insertion of CuO and PbO nanoparticles in the PS and PVC polymers. The analysis of the elaborated nanocomposites by X-ray diffraction has allowed to notice the incorporation of the CuO and PbO crystallites into the PS and PVC polymers matrixes and analysis by Raman and infrared spectroscopies has confirmed the presence of CuO and PbO crystallites in the PS and PVC matrixes by revealing specific vibration modes to the Cu-O and Pb-O bonds. The surface morphology and topography of thin films of nanocomposites were highlighted with the help of atomic force microscopy (AFM) and have shown homogeneous dispersion of CuO and PbO crystallites and a low surface roughness. the characterization by measurement of the optical absorption in the UV-Visible domain allows to observe the increase in optical absorption which is attributed to CuO and PbO nanocrystallites because PS and PVC are optically transparent in the UV-Visible domain. A shift of the gap energy of the nanocomposites compared with the gap energy of the pure polymers and the massive crystallites of CuO and PbO was observed. This variation in gap energy is the result of the new optical behavior of the prepared nanocomposites.
The optical characterization by the measure of the photoluminescence has shown that the elaborated samples present intense luminescence bands in the visible range, hence the possibility of consider these matrices as optically active media and can be used for the making devices of specific optics properties.
Diplôme : Doctorat en sciences En ligne : ../theses/physique/TRO7142.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=10460 Elaboration et caractérisation de nanocomposites hybrides : Oxydes métalliques/polymères [texte imprimé] / Bariza Troudi, Auteur ; Ouahiba Halimi, Directeur de thèse . - [S.l.] : جامعة الإخوة منتوري قسنطينة, 2017 . - 121 f. ; 30 cm.
2 copies imprimées disponibles
Langues : Français (fre)
Tags : Synthèse hydrothermale Nanocomposites Films minces CuO/PS CuO/PVC PbO/PS PbO/PVC DRX FT-IR Raman AFM Absorption UV-Visible photoluminescence Hydrothermal synthesis thin films UV-Visible Absorption ?????? ?????? ????? ????? ???????? ??? ????????- ???? ???????? ?????? Index. décimale : 530 Physique Résumé : Thin films of metal oxides/polymers nanocomposites were deposited on glass substrates by Spin-Coating and Dip-Coating techniques. The nanocomposites were elaborated by inserting, in the matrices of polystyrene (PS) and polyvinyl chloride (PVC) polymers, of nanoparticles of metal oxides such as copper oxide (CuO) and lead oxide (PbO). The nanoparticles of semiconductor CuO and PbO were synthesized beforehand by the hydrothermal method. The xray diffraction characterization of the obtained powders have revealed a monoclinic phase for CuO crystallites and an orthorhombic phase for PbO. The size of the crystallites of the two semiconductors is of a nanometic order. Calcul the of gap energy indicate a shift towards high energies compared to massive crystals. This shift is due to the effect of the quantum confinement induced by the nanometric size of the crystallites of the semiconductors. These nanocrystals are used for the preparation of the nanocomposites of CuO/PS, CuO/PVC, PbO/PS and PbO/PVC by
simple insertion of CuO and PbO nanoparticles in the PS and PVC polymers. The analysis of the elaborated nanocomposites by X-ray diffraction has allowed to notice the incorporation of the CuO and PbO crystallites into the PS and PVC polymers matrixes and analysis by Raman and infrared spectroscopies has confirmed the presence of CuO and PbO crystallites in the PS and PVC matrixes by revealing specific vibration modes to the Cu-O and Pb-O bonds. The surface morphology and topography of thin films of nanocomposites were highlighted with the help of atomic force microscopy (AFM) and have shown homogeneous dispersion of CuO and PbO crystallites and a low surface roughness. the characterization by measurement of the optical absorption in the UV-Visible domain allows to observe the increase in optical absorption which is attributed to CuO and PbO nanocrystallites because PS and PVC are optically transparent in the UV-Visible domain. A shift of the gap energy of the nanocomposites compared with the gap energy of the pure polymers and the massive crystallites of CuO and PbO was observed. This variation in gap energy is the result of the new optical behavior of the prepared nanocomposites.
The optical characterization by the measure of the photoluminescence has shown that the elaborated samples present intense luminescence bands in the visible range, hence the possibility of consider these matrices as optically active media and can be used for the making devices of specific optics properties.
Diplôme : Doctorat en sciences En ligne : ../theses/physique/TRO7142.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=10460 Exemplaires
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Titre : Etude des méthodes d'évaluation et d'inhibition du pouvoir incrustant des eaux dures Type de document : texte imprimé Auteurs : Hadda Semine ras, Auteur ; Samira Ghizellaoui, Directeur de thèse Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2018 Importance : 218 f. Format : 30 cm. Note générale : 2 copies imprimées disponibles
Langues : Français (fre) Tags : Entartrage CaCO3 inhibition K2HPO4 K 3PO4 tripolyphosphates (STTP) chronoampérométrie chronoélectrogravimétrie impédancemétrie PCR RX Raman Scaling K3PO4 chroamperometry chronoelectrogravimetry impedancemetry FCP ???? ??????? ????????? ????? STTP K2HPO4????????????????
?????????????? ???????? ?????????????? ??????? ?????? ??????? ?????? ??????? ??? ?????Index. décimale : 540 Chimie et sciences connexes Résumé : The precipitation of an insulating layer of calcium carbonate on the walls of the water distribution of Hamma and Fourchi have serious consequences technique and economic , reduced heat transfer in heat exchangers, limit the efficiency of these devices (valves and taps) by decreasing the flow rate in the pipes.
The objective of this study is the inhibition of the scaling capacity of domestic and industrial hard water for Hamma and Fourchi in the presence of K2HPO4 and K3PO4 and STTP. Various processes (electrochemical and chemical) are used.
The study of the evaluation of the encrusting power of its waters was carried out by means of chronoamperometry which is based on the reduction of dissolved oxygen and showed that these waters are very scaling. To combat hard water scaling, we have shown that it is sufficient to add low concentrations of inhibitors (K2HPO4, K3PO4, Polyphosphates) in order to obtain a total inhibition of the precipitation of the calcium carbonate.
It is possible to determine by the chronoelectrogravimetric (depending on the mass of the calcium carbonate as a function of time) the amount of inhibitor to be added in order to obtain the total inhibition of the calcium carbonate deposition. K2HPO4, K3PO4 and tripolyphosphates (STTP) appear as inhibitors particularly well suited to hard waters.
Electrochemical Impedance Spectroscopy (EIS) is used to characterize the adhesion and compactness of calcium carbonate deposition on a metal surface by measuring the high frequency resistance (Rhf) and the high frequency capacitance (Chf).
The addition of the three inhibitors (K2HPO4, K3PO4 and tripolyphosphates STTP) resulted in a decrease in high frequency resistance and the high frequency capacity increased. This reflects the porous nature of the deposit and the effectiveness of the scaling inhibitors K2HPO4 and K3PO4 and tripolyphosphates STTP.
The Fast Controlled Precipitation test (FCP) developed by LEDION et al. (1997), in the presence of K2HPO4, K3PO4 and tripolyphosphate (STTP) at low concentrations, delayed precipitation of calcium carbonate.
The analysis of calcium carbonate deposition by (RX, Raman) changes the morphology of calcite in raw water to a mixture of (calcite, vaterite and aragonite). Among the inhibitors studied, STTP remains the best inhibitor because it acts at a very low concentration by blocking the (germination-growth) of calcium carbonate.
Diplôme : Doctorat en sciences En ligne : ../theses/chimie/SEM7263.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=10860 Etude des méthodes d'évaluation et d'inhibition du pouvoir incrustant des eaux dures [texte imprimé] / Hadda Semine ras, Auteur ; Samira Ghizellaoui, Directeur de thèse . - [S.l.] : جامعة الإخوة منتوري قسنطينة, 2018 . - 218 f. ; 30 cm.
2 copies imprimées disponibles
Langues : Français (fre)
Tags : Entartrage CaCO3 inhibition K2HPO4 K 3PO4 tripolyphosphates (STTP) chronoampérométrie chronoélectrogravimétrie impédancemétrie PCR RX Raman Scaling K3PO4 chroamperometry chronoelectrogravimetry impedancemetry FCP ???? ??????? ????????? ????? STTP K2HPO4????????????????
?????????????? ???????? ?????????????? ??????? ?????? ??????? ?????? ??????? ??? ?????Index. décimale : 540 Chimie et sciences connexes Résumé : The precipitation of an insulating layer of calcium carbonate on the walls of the water distribution of Hamma and Fourchi have serious consequences technique and economic , reduced heat transfer in heat exchangers, limit the efficiency of these devices (valves and taps) by decreasing the flow rate in the pipes.
The objective of this study is the inhibition of the scaling capacity of domestic and industrial hard water for Hamma and Fourchi in the presence of K2HPO4 and K3PO4 and STTP. Various processes (electrochemical and chemical) are used.
The study of the evaluation of the encrusting power of its waters was carried out by means of chronoamperometry which is based on the reduction of dissolved oxygen and showed that these waters are very scaling. To combat hard water scaling, we have shown that it is sufficient to add low concentrations of inhibitors (K2HPO4, K3PO4, Polyphosphates) in order to obtain a total inhibition of the precipitation of the calcium carbonate.
It is possible to determine by the chronoelectrogravimetric (depending on the mass of the calcium carbonate as a function of time) the amount of inhibitor to be added in order to obtain the total inhibition of the calcium carbonate deposition. K2HPO4, K3PO4 and tripolyphosphates (STTP) appear as inhibitors particularly well suited to hard waters.
Electrochemical Impedance Spectroscopy (EIS) is used to characterize the adhesion and compactness of calcium carbonate deposition on a metal surface by measuring the high frequency resistance (Rhf) and the high frequency capacitance (Chf).
The addition of the three inhibitors (K2HPO4, K3PO4 and tripolyphosphates STTP) resulted in a decrease in high frequency resistance and the high frequency capacity increased. This reflects the porous nature of the deposit and the effectiveness of the scaling inhibitors K2HPO4 and K3PO4 and tripolyphosphates STTP.
The Fast Controlled Precipitation test (FCP) developed by LEDION et al. (1997), in the presence of K2HPO4, K3PO4 and tripolyphosphate (STTP) at low concentrations, delayed precipitation of calcium carbonate.
The analysis of calcium carbonate deposition by (RX, Raman) changes the morphology of calcite in raw water to a mixture of (calcite, vaterite and aragonite). Among the inhibitors studied, STTP remains the best inhibitor because it acts at a very low concentration by blocking the (germination-growth) of calcium carbonate.
Diplôme : Doctorat en sciences En ligne : ../theses/chimie/SEM7263.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=10860 Exemplaires
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