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Partager le résultat de cette recherche Interroger des sources externesEtude du spray lors des phses d'injection et de combustion dans la chambre de combustion d'un moteur disel / Fatima Haddad
Titre : Etude du spray lors des phses d'injection et de combustion dans la chambre de combustion d'un moteur disel Type de document : texte imprimé Auteurs : Fatima Haddad ; Université Mentouri, Editeur scientifique ; S. Boudebous, Directeur de thèse Année de publication : 2005 Importance : 106 f. Note générale : 01 Disponible à la salle de recherche 02 Disponibles au magazin de la bibliothèque centrale 01 CD Langues : Français (fre) Tags : Spray Moteur diesel Code KIVA II Index. décimale : 620 Génie Mécanique En ligne : ../theses/gmecanique/HAD4291.pdf Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=680 Etude du spray lors des phses d'injection et de combustion dans la chambre de combustion d'un moteur disel [texte imprimé] / Fatima Haddad ; Université Mentouri, Editeur scientifique ; S. Boudebous, Directeur de thèse . - 2005 . - 106 f.
01 Disponible à la salle de recherche 02 Disponibles au magazin de la bibliothèque centrale 01 CD
Langues : Français (fre)
Tags : Spray Moteur diesel Code KIVA II Index. décimale : 620 Génie Mécanique En ligne : ../theses/gmecanique/HAD4291.pdf Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=680 Exemplaires
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Titre : Elaboration et caracterisation des couches minces d’oxyde de zinc et sulfure de zinc preparees par spray ultrasonique Type de document : texte imprimé Auteurs : Lilia Baghriche, Auteur ; Mohamed Salah Aida, Directeur de thèse Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2015 Importance : 119 f. Format : 30 cm. Note générale : 2 copies imprimées disponibles
Langues : Français (fre) Tags : Couches Minces ZnO ZnS Spray molarité propriétés optiques propriétés
électriques DRX MEB goutte impactant la tension superficielle Thin films Molarity DRX Optical properties Electrical
properties The droplet impact The surface tension ??????? ??????? ????? ????? ??????? ????? ???? ?????? ?????? ????? ?????? ??????? ??????? ??????????Index. décimale : 530 Physique Résumé : The present work deals with the preparation and the characterization of zinc oxide (ZnO) and zinc sulfide (ZnS) thin films by ultrasonic spray. Our goal is to carry a comprehensive study on the effect of the deposition parameters (substrate temperature and the nature of the precursor solution (zinc acetate and zinc nitrate) for ZnO, molarity and the nature of the precursor solution (zinc nitrate and zinc chloride) for ZnS) on the physical properties of zinc oxide and zinc sulfide thin films.
X-ray diffraction (XRD ) analysis reveals that at low temperature the films are
composed of nanocrystallites with a privileged orientation depending on the precursor nature;these orientations are along the plane (100) for the films deposited with zinc acetate and along (002) for films prepared with zinc nitrate precursor. However, with increasing deposition temperature, the privileged orientation disappears. The scanning electron microscopy (SEM) observations suggest that the liquid droplets react once they reach the substrate surface when zinc acetate precursor is used. However, in the case of zinc nitrate solution, the droplets spread first on the substrate surface followed by the subsequent surface
reaction. The surface tension of the starting solution controls the shape of the droplet impact and thereafter the film microstructure.
The ZnS thin films have an amorphous structure at 300°C. The growth rate is closely
related to the sulfide molarity and to the nature of the starting solution. It increases with sulfide molarity for both used solutions. MEB and optical microscope surface observations reveal that the increasing in sulphide molarity yields to denser and rougher films regardless the used precursors. The RMS value increase with an increase in sulfide molarity for the two precursors. The analysis of the transmittance spectra in the visible range allows us to deduce the optical band gap and disorder of ZnS thin films. The transparency in our films was more than 70% for the two precursors and absorption edge shifts towards blue with the decreasing
of the molarity of sulfide from 0,05 to 0.02mol/l is shown for Zinc chloride.
The electrical conductivity of zinc oxide and zinc sulfide thin films was deduced from transport measurement using two probes coplanar structure.Diplôme : Doctorat en sciences En ligne : ../theses/physique/BAG6807.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=10060 Elaboration et caracterisation des couches minces d’oxyde de zinc et sulfure de zinc preparees par spray ultrasonique [texte imprimé] / Lilia Baghriche, Auteur ; Mohamed Salah Aida, Directeur de thèse . - [S.l.] : جامعة الإخوة منتوري قسنطينة, 2015 . - 119 f. ; 30 cm.
2 copies imprimées disponibles
Langues : Français (fre)
Tags : Couches Minces ZnO ZnS Spray molarité propriétés optiques propriétés
électriques DRX MEB goutte impactant la tension superficielle Thin films Molarity DRX Optical properties Electrical
properties The droplet impact The surface tension ??????? ??????? ????? ????? ??????? ????? ???? ?????? ?????? ????? ?????? ??????? ??????? ??????????Index. décimale : 530 Physique Résumé : The present work deals with the preparation and the characterization of zinc oxide (ZnO) and zinc sulfide (ZnS) thin films by ultrasonic spray. Our goal is to carry a comprehensive study on the effect of the deposition parameters (substrate temperature and the nature of the precursor solution (zinc acetate and zinc nitrate) for ZnO, molarity and the nature of the precursor solution (zinc nitrate and zinc chloride) for ZnS) on the physical properties of zinc oxide and zinc sulfide thin films.
X-ray diffraction (XRD ) analysis reveals that at low temperature the films are
composed of nanocrystallites with a privileged orientation depending on the precursor nature;these orientations are along the plane (100) for the films deposited with zinc acetate and along (002) for films prepared with zinc nitrate precursor. However, with increasing deposition temperature, the privileged orientation disappears. The scanning electron microscopy (SEM) observations suggest that the liquid droplets react once they reach the substrate surface when zinc acetate precursor is used. However, in the case of zinc nitrate solution, the droplets spread first on the substrate surface followed by the subsequent surface
reaction. The surface tension of the starting solution controls the shape of the droplet impact and thereafter the film microstructure.
The ZnS thin films have an amorphous structure at 300°C. The growth rate is closely
related to the sulfide molarity and to the nature of the starting solution. It increases with sulfide molarity for both used solutions. MEB and optical microscope surface observations reveal that the increasing in sulphide molarity yields to denser and rougher films regardless the used precursors. The RMS value increase with an increase in sulfide molarity for the two precursors. The analysis of the transmittance spectra in the visible range allows us to deduce the optical band gap and disorder of ZnS thin films. The transparency in our films was more than 70% for the two precursors and absorption edge shifts towards blue with the decreasing
of the molarity of sulfide from 0,05 to 0.02mol/l is shown for Zinc chloride.
The electrical conductivity of zinc oxide and zinc sulfide thin films was deduced from transport measurement using two probes coplanar structure.Diplôme : Doctorat en sciences En ligne : ../theses/physique/BAG6807.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=10060 Exemplaires
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Titre : Etude structurale et optique de films minces ZnO élaborés par voie physique et/ou chimique Type de document : texte imprimé Auteurs : Adel Taabouche, Auteur ; A. Bouabellou, Directeur de thèse Editeur : Constantine : Université Mentouri Constantine Année de publication : 2015 Importance : 107 f. Format : 30 cm. Note générale : 2 copies imprimées disponibles
Langues : Français (fre) Tags : Sciences des matériaux Couche mince ZnO PLD Spray DRX AFM RBS M-lines UV-visible Effet Hall Thin films XRD Hall Effect ????? ????? ????????? ??????? ???? ??? ?????? ?????? ??????
??????? ??????? ??????? ??????? ?????? ??????? ??? ???Index. décimale : 530 Physique Résumé : In the present work, we have studied essentially the structural and optical properties of ZnO thin films elaborated using the physical technique s of the pulsed laser ablation (PLD) and the chemical method of the ultrasonic spray pyrolysis.
We have prepared undoped (ZnO) and cobalt-doped zinc oxide (CZO) thin films (Co: 3,5 at.%) by means of the PLD method. Synthesized films have been deposited on glass and silicon substrates heated at 450°C. The used source was a KrF eximer laser (248 nm, 25 ns, 2 J ⁄cm2). Different experimental techniques have been carried out to analyze the fabricated films: the X-ray diffraction (XRD), atomic force microscopy (AFM), Rutherford Backscattering spectrometry (RBS), UV-visible spectrophotometry, M-lines
spectroscopy and Hall effect.
While the ZnO films obtained by the ultrasonic spray technique have been deposited with different deposition times (10, 20, 30 min) on a glass substrate heated at 410 °C, and then they have characterized by XRD, AFM, UV-visible, M-lines and hall effect techniques.
The carried out study shows that all the prepared zinc oxide films have a hexagonal wurtzite-type structure and a preferentially oriented along the direction (002) confused with the c-axis perpendicular to the surface of the substrates. The grain sizes deducted from the XRD measurements vary between 24 and 40 nm. The optical coupling analysis realized by M-lines show that the ZnO films are monomode (for both TE and TM polarizations). However, the undoped ZnO film obtained by PLD is found to be two
guiding modes for TM. The films obtained have an optical transmission of 70 to 90% in the visible region of the spectrum and an optical band gap varying from 3.18 to 3.37 eV.
The electrical conductivity and the concentration of carriers, deduced from Hall effect measurements, are relatively low namely for the films prepared by spray pyrolysis technique.
Diplôme : Doctorat en sciences En ligne : ../theses/physique/TAA6719.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=9904 Etude structurale et optique de films minces ZnO élaborés par voie physique et/ou chimique [texte imprimé] / Adel Taabouche, Auteur ; A. Bouabellou, Directeur de thèse . - Constantine : Université Mentouri Constantine, 2015 . - 107 f. ; 30 cm.
2 copies imprimées disponibles
Langues : Français (fre)
Tags : Sciences des matériaux Couche mince ZnO PLD Spray DRX AFM RBS M-lines UV-visible Effet Hall Thin films XRD Hall Effect ????? ????? ????????? ??????? ???? ??? ?????? ?????? ??????
??????? ??????? ??????? ??????? ?????? ??????? ??? ???Index. décimale : 530 Physique Résumé : In the present work, we have studied essentially the structural and optical properties of ZnO thin films elaborated using the physical technique s of the pulsed laser ablation (PLD) and the chemical method of the ultrasonic spray pyrolysis.
We have prepared undoped (ZnO) and cobalt-doped zinc oxide (CZO) thin films (Co: 3,5 at.%) by means of the PLD method. Synthesized films have been deposited on glass and silicon substrates heated at 450°C. The used source was a KrF eximer laser (248 nm, 25 ns, 2 J ⁄cm2). Different experimental techniques have been carried out to analyze the fabricated films: the X-ray diffraction (XRD), atomic force microscopy (AFM), Rutherford Backscattering spectrometry (RBS), UV-visible spectrophotometry, M-lines
spectroscopy and Hall effect.
While the ZnO films obtained by the ultrasonic spray technique have been deposited with different deposition times (10, 20, 30 min) on a glass substrate heated at 410 °C, and then they have characterized by XRD, AFM, UV-visible, M-lines and hall effect techniques.
The carried out study shows that all the prepared zinc oxide films have a hexagonal wurtzite-type structure and a preferentially oriented along the direction (002) confused with the c-axis perpendicular to the surface of the substrates. The grain sizes deducted from the XRD measurements vary between 24 and 40 nm. The optical coupling analysis realized by M-lines show that the ZnO films are monomode (for both TE and TM polarizations). However, the undoped ZnO film obtained by PLD is found to be two
guiding modes for TM. The films obtained have an optical transmission of 70 to 90% in the visible region of the spectrum and an optical band gap varying from 3.18 to 3.37 eV.
The electrical conductivity and the concentration of carriers, deduced from Hall effect measurements, are relatively low namely for the films prepared by spray pyrolysis technique.
Diplôme : Doctorat en sciences En ligne : ../theses/physique/TAA6719.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=9904 Exemplaires
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Titre : Etude de la combustion turbulente dans une chambre de combustion tridimensionnelle d'un moteur Diesel Type de document : texte imprimé Auteurs : Daoud Daddi ouaissa ; Université Mentouri, Editeur scientifique ; Z. Nemouchi, Directeur de thèse Année de publication : 2006 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 : Spray Moteur diesel Code KIVA H Index. décimale : 620 Génie Mécanique En ligne : ../theses/gmecanique/DAD4736.pdf Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=886 Etude de la combustion turbulente dans une chambre de combustion tridimensionnelle d'un moteur Diesel [texte imprimé] / Daoud Daddi ouaissa ; Université Mentouri, Editeur scientifique ; Z. Nemouchi, Directeur de thèse . - 2006 . - 89 f.
01 Disponible à la salle de recherche 02 Disponibles au magazin de la B.U.C. 01 CD
Langues : Français (fre)
Tags : Spray Moteur diesel Code KIVA H Index. décimale : 620 Génie Mécanique En ligne : ../theses/gmecanique/DAD4736.pdf Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=886 Exemplaires
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Titre : Elaboration et caractérisation des hétérojonctions à base de couches minces de ZnO et ZnS Type de document : texte imprimé Auteurs : Hichem Lekiket ; Université Mentouri, Editeur scientifique ; Mohamed Salah Aida, Directeur de thèse Année de publication : 2008 Importance : 76 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 : Spray Couche mince ZnO Zns Hétérojonctions Index. décimale : 530 Physique En ligne : ../theses/physique/LeK5056.pdf Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=3543 Elaboration et caractérisation des hétérojonctions à base de couches minces de ZnO et ZnS [texte imprimé] / Hichem Lekiket ; Université Mentouri, Editeur scientifique ; Mohamed Salah Aida, Directeur de thèse . - 2008 . - 76 f.
01 Disponible à la salle de recherche 02 Disponibles au magazin de la B.U.C. 01 CD
Langues : Français (fre)
Tags : Spray Couche mince ZnO Zns Hétérojonctions Index. décimale : 530 Physique En ligne : ../theses/physique/LeK5056.pdf Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=3543 Exemplaires
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