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Dissertations / Theses on the topic 'Porte de phase'

Author: Grafiati

Published: 7 July 2024

Last updated: 31 July 2025

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1

De, Grandpré Guillaume. "La dynamique locale : une porte d’entrée sur les mécanismes de formation de la phase vitreuse dans des molécules organiques." Mémoire, Université de Sherbrooke, 2016. http://hdl.handle.net/11143/8363.

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Les verres moléculaires suscitent depuis quelques années un intérêt croissant. Tapis dans l’ombre des verres polymériques, ils se sont révélés de bien meilleurs matériaux pour des utilisations fort intéressantes en photolithographie et en optoélectronique. Un intérêt particulier pour le laboratoire est qu’un simple changement structural peut amener à des propriétés du verre fort différentes. Les travaux présentés dans ce mémoire ont été motivés par le désir de mieux comprendre cet effet micro ayant un fort impact sur le macro. Pour rendre compte de ces changements, la modélisation moléculaire

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2

Ashkarin, Ivan. "Few-body Förster resonances in Rydberg atoms for the implementation of quantum computing." Electronic Thesis or Diss., université Paris-Saclay, 2023. http://www.theses.fr/2023UPASP199.

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L'application des résonances de Förster à plusieurs corps est étudiée pour réaliser des circuits de portes quantiques multi-qbits. Deux nouveaux types de transitions borroméennes à trois atomes utilisant un atome relais ont été proposées et étudiées numériquement. En particulier, une résonance de Förster à trois atomes non isolée et contrôlée par effet Stark entre des états S et P de niveaux élevés n = 80, 81, 82 avec des atomes de Rb isolés dans des pièges optiques a été modélisée. Une résonance de Förster isolée à trois atomes a également été démontrée pour les états n = 70, 71 des atomes Rb

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3

Messager, Valérie. "Nouveaux procédés pour la caractérisation cohérente d'impulsions Femtosecondes et pour la caractérisation des non linéarités du troisième ordre." Limoges, 2002. http://www.theses.fr/2002LIMO0044.

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La première partie de ce travail concerne une technique originale de caractérisation complète, en amplitude et en phase, du profil temporel d' impulsions femtosecondes. Cette technique est basée sur l' interférométrie spectrale à décalage. Les modulations spectrales sont isolées par une porte temporelle rapide. Un traitement numérique direct, permet d' accéder à la différence de phase du signal de battements puis de restituer l' amplitude et la phase temporelle de l' impulsion. La seconde partie porte sur une nouvelle technique de caractérisation des non linéarités Kerr d' origine électronique

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4

Suicmez, Vural Sander. "Pore scale simulation of three-phase flow." Thesis, Imperial College London, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.441972.

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5

Piri, Mohammad. "Pore scale modelling of three-phase flow." Thesis, Imperial College London, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.407699.

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6

Al-Gharbi, Mohammed Saif Hilal. "Dynamic pore-scale modelling of two-phase flow." Thesis, Imperial College London, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.409745.

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7

Yaghi, Mohammed. "Phase Field Modeling of Water Solidification : A Port-Hamiltonian Approach." Electronic Thesis or Diss., Lyon 1, 2024. http://www.theses.fr/2024LYO10198.

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Cette thèse présente une étude sur la modélisation, la formulation par le formalisme des Systèmes Hamiltoniens à ports et la discrétisation des processus de solidification dont l'interface est supposée diffuse et est modélisée par l'approche des champs de phase. Ses travaux traitent en détail de la solidification de l'eau dans le contexte de fournir des modèles numériques adaptés à la simulation, à la conception et au contrôle de procédés de purification de l'eau. Le premier chapitre rappelle d'abord de manière synthétique les modèles physiques de systèmes biphasique et de leur interface. Il p

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8

Topomondzo, Joseph Désiré. "Etude des effets de biréfringence induite dans les amplificateurs optiques à semi-conducteurs : applications dans les systèmes de communications optiques." Phd thesis, Télécom ParisTech, 2004. http://pastel.archives-ouvertes.fr/pastel-00001104.

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Dans le cadre des futurs réseaux de télécommunication optiques, les phénomènes non-linéaires dans les amplificateurs optiques à semi-conducteurs (AOS) telles que la modulation croisée de polarisation (XPolM) et la modulation de phase croisée sont exploités pour réaliser des fonctions de traitement tout-optique nouvelles. Ces fonctions sont dédiées au routage, à la commutation de paquets et la reconnaissance des en-têtes dans les réseaux de transmission optiques. L'objectif de ce travail était double: d'une part la compréhension de la biréfringence induite dans l'AOS et en particulier le phénom

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9

Al, Nahari Alhashmi Zaki Mahmoud Sharif. "Modelling single-phase fluid-fluid reactive transport at the pore-scale." Thesis, Imperial College London, 2015. http://hdl.handle.net/10044/1/41967.

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Reactive transport is an important field of study in the earth sciences. It captures both natural phenomena, and industrial and environmental applications, including transport of pollutants in the subsurface, nuclear waste storage, and carbon storage. The aim of this thesis is to provide a better understanding of coupled physico-chemical processes governing these phenomena as well as to be used as tools for better understanding these environmental applications. We introduce from first principles a novel pore-scale modelling approach capable of simulating single-phase fluid-fluid reactive trans

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10

Sisavath, Sourith. "Fundamental pore-scale modelling of single-phase flow through sedimentary rocks." Thesis, Imperial College London, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.394470.

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11

Correia, Márcia Sofia Barbosa. "Internship report in clinical studies coordination at IPO-Porto." Master's thesis, Universidade de Aveiro, 2014. http://hdl.handle.net/10773/12949.

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Mestrado em Biomedicina Farmacêutica<br>This report describes my activities as study coordinator (SC) intern, at the “Unidade de Investigação Clínica” (UIC) in the Oncology Portuguese Institute of Porto (IPOP). This training occurred during the second year of the Pharmaceutical Biomedicine Master at the University of Aveiro. My internship took place between 21st January, 2013 and 4th October, 2013 with the main objective to gain experience and expertise in oncology coordinating clinical trials. I present the state-of-the-art of clinical research with emphasis on current situation in Portugal a

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12

Cardoso, Ana Veronica Santos. "Pandemic Influenza A (H1N1)v in the North of Portugal - Epidemiology, Clinical Presentation and Prognosis during Containmente Phase." Master's thesis, Faculdade de Medicina da Universidade do Porto, 2009. http://hdl.handle.net/10216/50163.

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13

Cardoso, Ana Veronica Santos. "Pandemic Influenza A (H1N1)v in the North of Portugal - Epidemiology, Clinical Presentation and Prognosis during Containmente Phase." Dissertação, Faculdade de Medicina da Universidade do Porto, 2009. http://hdl.handle.net/10216/50163.

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14

Ernst, Vincent Y. "Caractérisation de deux-ports bruyants par la méthode de variation de phase/fréquence." Doctoral thesis, Universite Libre de Bruxelles, 1993. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/212776.

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15

Fang, Wei. "Model-based retrieval of phase-related quantities for two-port microwave devices." Thesis, University of Ottawa (Canada), 2005. http://hdl.handle.net/10393/26900.

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In this thesis a new method is proposed for the retrieval of phase-related quantities from magnitude-only measurements on two-port microwave systems. The method is applicable when a microwave system is manufactured in relatively large quantities. A reduced-order model is developed using the prototype of such a system. Such a reduced-order model will include a number of quantities or "coefficients" (other than frequency) whose value is determined using a full vector data set on the prototype. Establishing the form required for the reduce-order model acts as the additional constraints that are n

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16

Davis, R. G. "Two-port millimetre wave oscillators and their stabilisation with phase-locked loops." Thesis, Lancaster University, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.383542.

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17

Matharoo, Rishi. "1/f Additive Phase Noise Analysis for One-Port Injection Locked Oscillators." The Ohio State University, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=osu1430772754.

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18

Hippauf, Felix. "Tailoring Pore Size and Polarity for Liquid Phase Adsorption by Porous Carbons." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2017. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-223482.

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Adsorption is a versatile purification technique to selectively separate different peptide fractions from a mixture using mild operation conditions. Porous carbons are ideally suited to separate ACE-inhibiting dipeptides by combining tailored size exclusion and polarity selectivity. The desired peptide fraction is mostly hydrophobic and very small and should adsorb inside hydrophobic micropores. The second topic of this thesis is linked to energy storage. The lithium-sulfur battery is a promising alternative to common lithium-ion batteries with theoretical capacities of up to 1672 mAh g−1 sul

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19

Dearie, Helen Sara. "Capillary electrochromatography on conventional and wide pore stationary phases." Thesis, Imperial College London, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.248374.

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20

Sibold, Jeremias. "Phase separation of biomimetic membranes:." Doctoral thesis, Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2019. http://hdl.handle.net/21.11130/00-1735-0000-0005-12CA-3.

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21

Irizarry, Julia Tonge. "Modeling the effects of three-dimensional pore geometry on gas hydrate phase stability." Thesis, University of Oregon, 2015. http://pqdtopen.proquest.com/#viewpdf?dispub=1596317.

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<p> Porous media affect hydrate stability by forcing hydrate-liquid interfaces to form high curvature geometries and by forcing the molecules of the hydrate, liquid, and sedimentary particles that compose the medium to interact where they are in close proximity. To evaluate these effects we first create synthetic spherical packings to approximate pore space geometry. We use the synthetic pore space to calculate the perturbation to the chemical potential caused by the geometrical constraints. Our model predictions agree with published data for ice-water and water-vapor systems. When particles a

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22

Rabbani, Harris. "Pore-scale investigation of wettability effects on two-phase flow in porous media." Thesis, University of Manchester, 2018. https://www.research.manchester.ac.uk/portal/en/theses/porescale-investigation-of-wettability-effects-on-twophase-flow-in-porous-media(4da35c39-fc12-4d2c-8645-53bb617696aa).html.

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Physics of immiscible two-phase flow in porous media is relevant for various industrial and environmental applications. Wettability defined as the relative affinity of fluids with the solid surface has a significant impact on the dynamics of immiscible displacement. Although wettability effects on the macroscopic fluid flow behaviour are well known, there is a lack of pore-scale understanding. Considering the crucial role of wettability in a diverse range of applications; this research aims to provide a pore-scale picture of interface configuration induced by variations in the wetting characte

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23

Irizarry, Julia. "Modeling the Effects of Three-Dimensional Pore Geometry on Gas Hydrate Phase Stability." Thesis, University of Oregon, 2015. http://hdl.handle.net/1794/19304.

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Porous media affect hydrate stability by forcing hydrate-liquid interfaces to form high curvature geometries and by forcing the molecules of the hydrate, liquid, and sedimentary particles that compose the medium to interact where they are in close proximity. To evaluate these effects we first create synthetic spherical packings to approximate pore space geometry. We use the synthetic pore space to calculate the perturbation to the chemical potential caused by the geometrical constraints. Our model predictions agree with published data for ice-water and water-vapor systems. When particles are w

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24

Erzeybek, Selin. "Pore Network Modeling Of Fissured And Vuggy Carbonates." Master's thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/12609626/index.pdf.

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Carbonate rocks contain most of the world&rsquo<br>s proven hydrocarbon reserves. It is essential to predict flow properties and understand flow mechanisms in carbonates for estimating hydrocarbon recovery accurately. Pore network modeling is an effective tool in determination of flow properties and investigation of flow mechanisms. Topologically equivalent pore network models yield accurate results for flow properties. Due to their simple pore structure, sandstones are generally considered in pore scale studies and studies involving carbonates are limited. In this study, in order to understan

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25

Atig, Dyhia. "Propriétés physiques et mécaniques de l’hydrate de méthane à l’échelle du pore." Thesis, Pau, 2019. http://www.theses.fr/2019PAUU3021.

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Les hydrates de gaz sont des composés cristallins stables à haute pression et à basse température, très répandus sur terre, notamment dans les fonds marins au niveau des marges continentales, où ils contribuent à la stabilité des sédiments par leur cohésion et leur adhésion aux surfaces minérales. Cependant, le comportement mécanique des hydrates en soi a été peu ou pas étudié à l’échelle du pore. L’objectif de cette thèse est d’étudier les conditions de stabilité et les propriétés mécaniques en traction de l’hydrate de méthane à l’échelle du pore, dans une configuration comparable à celle qu’

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26

REYNAL, SYLVAIN. "Transitions de phase dans les systèmes de spins régis par des interactions à longue portée." Phd thesis, Université de Cergy Pontoise, 2005. http://tel.archives-ouvertes.fr/tel-00010256.

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Dans cette thèse, nous explorons le comportement critiques de chaînes de spins gouvernées par des interactions à décroissance algébrique. Dans une première partie, nous étudions le diagramme de phase d'une chaîne de Potts en utilisant un algorithme multicanonique. Nous proposons une nouvelle méthode de détection de l'ordre des transitions de phase exploitant les points spinodaux. A l'aide de cette méthode, nous localisons la ligne séparant les transitions du premier et du second ordre avec une précision sans précédent, et mettons en évidence un effet de taille finie inhabituel. Dans une deuxiè

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27

Kayser, Avril Freda Francina. "The lived experiences of intermediate phase teachers of curriculum renewal processes from 1998 to 2012 in Port Elizabeth." Thesis, Nelson Mandela Metropolitan University, 2013. http://hdl.handle.net/10948/d1020063.

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This research study has emerged as a result of my concern regarding many of my colleagues’ apparent low morale in the teaching profession. Since the new dispensation in 1994 the South African education system has undergone numerous and intensive curriculum changes as varying policies aimed at transforming education in South Africa have been implemented (Asmal, 2009). I, therefore, decided to investigate the lived experiences of Intermediate Phase teachers regarding curriculum renewal processes in South Africa over a fifteen year period from 1998 to 2012. This period encompasses the four curric

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28

Fédou, Roland. "Modélisation de l'infiltration chimique en phase vapeur, CVI isotherme et isobare : étude de l'infiltration d'un pore rectiligne par diverses céramiques." Bordeaux 1, 1992. http://www.theses.fr/1992BOR10512.

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La technique d'infiltration chimique en phase vapeur (cvi) est utilisee pour densifier des preformes poreuses constituees de fibres ceramiques en vue de preparer des composites thermostructuraux a matrice ceramique. Une modelisation numerique du procede cvi est proposee, qui prend en compte les couplages entre transferts de masse (par diffusion de fick et de knudsen) et processus chimiques heterogenes se produisant a l'interieur d'un pore rectiligne. Ce modele, qui peut integrer une loi cinetique quelconque representant la reaction de depot, est applique a divers systemes chimiques conduisant

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29

Puig, Montellà Eduard. "Modeling capillarity and two-phase flow in granular media : from pore-scale to network scale." Thesis, Université Grenoble Alpes (ComUE), 2019. http://www.theses.fr/2019GREAI046/document.

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Les simulations numériques à l'échelle du pore sont fréquemment utilisées pour étudier le comportement des écoulements multiphasiques largement rencontrées dans phénomènes naturels et applications industrielles. Dans ce travail, la morphologie de structures liquides et l'action capillaire sont examinées à l'échelle des pores par la méthode de Boltzmann sur réseau (LBM) à plusieurs composants selon le modèle de Shan-Chen. Les résultats numériques obtenus sont en bon accord avec les solutions théoriques. Les simulations numériques sont étendues à microstructures complexes au-delà du régime pendu

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30

Mirabelli, Thomas G. "The effect of gravity on the evolution of pore and grain structure during liquid-phase sintering." Thesis, Georgia Institute of Technology, 1999. http://hdl.handle.net/1853/20021.

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31

Scott, Brian Lee. "Fabrication and Characterization of a Porous Clad Optical Fiber Gas Sensor." Thesis, Virginia Tech, 2008. http://hdl.handle.net/10919/30906.

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An optical fiber has been developed that can be used as a chemical gas sensor. Fabrication of the optical fiber produces a fiber that has a solid core with a porous cladding. The porous cladding region is made from a spinodally phase separable glass where the secondary phase is removed through dilute acid leaching. A non-phase separable glass composition is used for the core region. The properties of the phase separable glass are dependent on the processing conditions and the thermal history of the glass after the porosity has been achieved. Investigation of how processing conditions affected

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32

Soll, Wendy Eileen. "Development of a pore-scale model for simulating two and three phase capillary pressure-saturation relationships." Thesis, Massachusetts Institute of Technology, 1991. http://hdl.handle.net/1721.1/13899.

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33

Al-Dhahli, Adnan. "Pore- to field-scale modelling of three-phase flow processes in heterogeneous reservoirs with arbitrary wettability." Thesis, Heriot-Watt University, 2013. http://hdl.handle.net/10399/2646.

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Most reservoirs, such as carbonate reservoirs not only have structural heterogeneities (e.g. complexly shaped geobodies or fractures). But they also have distributed wettabilities and are mixed- to oil-wet. The interplay of structural and wettability heterogeneities impacts sweep efficiency and oil recovery. Choosing the appropriate Improved Oil Recovery (IOR) or Enhanced Oil Recovery (EOR) technique based on adequate predictions of oil recovery requires a sound understanding of the fundamental controls on fluid flow in mixed- to oil-wet andstructurally complex rocks. The underlying multiphase

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34

Shi, Zhang. "Pore-scale modelling of two phase flow in porous media with dynamic wettability and topological disorder." Thesis, University of Sydney, 2020. https://hdl.handle.net/2123/23525.

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Multiphase flow into a porous medium is widely encountered in many fields, e.g., oil recovery, carbon geosequestration and soil science. In this dissertation, focuses are placed on investigating the microscopic dynamic wettability using liquid bridges with a varying contact line geometry, and the topological disorder effects in two-phase flow at the mesoscale level. Both the capillary tube and liquid bridge are modelled via using the lattice Boltzmann method (LBM), to compare dynamic contact angles in a liquid bridge with these in a capillary tube, which finds that the dynamic contact angle be

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35

Mancois, Vincent. "Non-equilibrium long-range phase transition in cold atoms : theory and experiment." Thesis, Sorbonne université, 2018. http://www.theses.fr/2018SORUS427.

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Nous avons étudié les effets de la force longue portée résultante de l’absorption de faisceaux lasers dans un nuage d’atomes froids à deux dimensions. La force créée est attractive et reproduit la gravité Newtonienne le long du faisceau. Le nuage d’atomes, composé de strontium 88 (bosons), est refroidi et piégé sur la transition d’intercombinaison. En transférant les atomes dans un piège dipolaire à deux dimensions à la longueur d’onde magique, une transition de phase hors d’équilibre se produit dans l’ensemble canonique. En dessous d’une température critique, un système de particules autograv

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36

Sousa, Fernando Rangel de. "Application du corrélateur " Five-Port " aux PLLs, à la récupération de porteuse et à un MODEM de télécommunications dans la bande 1,8 - 5,5 Ghz." Paris, ENST, 2004. https://pastel.archives-ouvertes.fr/pastel-00000987.

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Le corrélateur "Five-Port" est un dispositif qui calcule précisément le rapport complexe entre deux signaux hyperfréquences à partir de la mesure des valeurs de puissance aux sorties d'un circuit interférométrique à cinq accès. Son application est connue dans les systèmes radars, les systèmes de détermination de la direction d'arrivée de signaux RF, les démodulateurs homodynes et, comme nous proposons dans ce travail, dans les boucles à verrouillage de phase et de récupération de porteuse. Tandis que les corrélateurs cartésiens classiques projettent le vecteur représentant le signal à démodule

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37

Urata, Yumi. "Effect of thermal pressurization with dilatancy and phase transitions of pore water on spontaneous dynamic rupture propagation." 京都大学 (Kyoto University), 2012. http://hdl.handle.net/2433/157783.

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38

Jonsson, Alexander. "Investigation of pore size effects at separation of oligonucleotides using Ion-pair RP HPLC : Examining of how the particle pore size of the stationary phase affects separations of oligonucleotides in therapeutic range." Thesis, Karlstads universitet, Fakulteten för hälsa, natur- och teknikvetenskap (from 2013), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-73367.

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Oligonucleotides may become a new class of therapies with the potential of curing many today untreatable diseases. Oligonucleotides becomes increasingly more difficult to separate with an increase in length since the relative difference in retention of these very similar compounds becomes increasingly smaller. Therefore, coelution of impurities formed during synthesis may result in insufficient purity, which is necessary for therapeutic treatments. Oligonucleotides are also relatively large biomolecules, possibly consisting of hundreds of nucleotides. As a result, oligonucleotides may have lim

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39

Williams, Andrew Robert. "Cracking Potential and Temperature Sensitivity of Metakaolin Concrete." Scholar Commons, 2016. http://scholarcommons.usf.edu/etd/6603.

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Metakaolin is a pozzolanic material with the potential to reduce permeability and chloride ingress; however, quantification of the effects of metakaolin use on the cracking sensitivity of concrete mixtures is needed to ensure that these improvements in performance are not compromised. This study was conducted to investigate the early age cracking potential due to restraint stresses from incorporating metakaolin in concrete. Calorimetry testing showed that metakaolin was more sensitive to temperature than mixtures with only Portland cement. Results showed more shrinkage, less stress relaxation,

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40

Xu, Zhi Guo. "An investigation of two-phase flow of organic working fluids in the inlet port of a Lysholm screw expander." Thesis, City University London, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.294052.

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41

Reynolds, Catriona Anne. "Two-phase flow behaviour and relative permeability between CO2 and brine in sandstones at the pore and core scales." Thesis, Imperial College London, 2016. http://hdl.handle.net/10044/1/44499.

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In this thesis we have performed an experimental investigation into steady-state two-phase flow behaviour at the core and pore scales and visualised the fluid distributions using medical and fast synchrotron X-ray computed tomography. We performed an experimental study of steady-state, drainage relative permeability curves with CO2-brine and N2-deionised water, on a single Bentheimer sandstone core with a simple two-layer heterogeneity over reservoir conditions of 10.3-20.7 MPa, 38-91°C and 0-5 mol kg-1 NaCl brine. We demonstrate that, if measured in the viscous limit, relative permeability is

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42

Kaufmann, Josef. "Experimental identification of damage mechanisms in cementitious porous materials on phase transition of pore solution under frost deicing salt attack /." Lausanne, 2000. http://library.epfl.ch/theses/?nr=2037.

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43

Hippauf, Felix Verfasser], Stefan [Akademischer Betreuer] [Kaskel, and Thomas [Gutachter] Henle. "Tailoring Pore Size and Polarity for Liquid Phase Adsorption by Porous Carbons / Felix Hippauf ; Gutachter: Thomas Henle ; Betreuer: Stefan Kaskel." Dresden : Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2017. http://d-nb.info/1133110630/34.

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44

Hippauf, Felix [Verfasser], Stefan [Akademischer Betreuer] Kaskel, and Thomas [Gutachter] Henle. "Tailoring Pore Size and Polarity for Liquid Phase Adsorption by Porous Carbons / Felix Hippauf ; Gutachter: Thomas Henle ; Betreuer: Stefan Kaskel." Dresden : Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2017. http://d-nb.info/1133110630/34.

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45

Weishaupt, Kilian [Verfasser], and Rainer [Akademischer Betreuer] Helmig. "Model concepts for coupling free flow with porous medium flow at the pore-network scale : from single-phase flow to compositional non-isothermal two-phase flow / Kilian Weishaupt ; Betreuer: Rainer Helmig." Stuttgart : Universitätsbibliothek der Universität Stuttgart, 2020. http://d-nb.info/1215101848/34.

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46

Duhem, François. "Diagramme de phase du réseau Kondo : aspects statiques et dynamiques." Université Joseph Fourier (Grenoble), 1999. http://www.theses.fr/1999GRE10121.

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Nous avons fait une etude theorique de certaines proprietes du reseau kondo dans sa phase paramagnetique, utilisant un modele incorporant des correlations antiferromagnetiques a courte portee. Nous nous sommes limites au cas de la bande de conduction a moitie pleine et avons utilise une methode de champ moyen. Les resultats obtenus sont les suivants : _ on montre qu'il est possible d'obtenir des solutions metalliques pour une bande de conduction a moitie pleine en modifiant la structure de bande, ceci nous amene a definir une temperature de transition isolant-metal qui est comparee aux tempera

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47

Uzun, Ilkay. "Use Of Pore Scale Simulators To Understand The Effects Of Wettability On Miscible Carbon Dioxide Flooding And Injectivity." Master's thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/2/12606876/index.pdf.

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This study concentrates on the modelling of three phase flow and miscible CO2 flooding in pore networks that captures the natural porous medium of a reservoir. That is to say, the network, that is a Matlab code, consists of different sided triangles which are located randomly through the grids. The throats that connect the pores are also created by the model. Hence, the lengths and the radii of the throats are varying. The network used in this research is assumed to be representative of mixed-wet carbonates in 2-D. Mixed wettability arises in real porous media when oil renders surfaces it come

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Dulina, I. O., T. F. Lobunets, L. O. Klochkov, and A. V. Ragulya. "Synthesis of Ni/NiO Nanosize Powders with Different Phase Ratio by Thermal Decomposition of Nickel Acetate Amines." Thesis, Sumy State University, 2013. http://essuir.sumdu.edu.ua/handle/123456789/35125.

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Ni/NiO nanopowders with different phase ratio have been prepared using thermal decomposition of nickel acetate ammine complexes containing various ammonia content in air at the temperature range 300 – 500 °C. Obtained powders have been characterized by IR-spectroscopy, XRD and TG, DTA, DTG, TEM, laser granulometry and adsorption-structural method. Thermal decomposition of nickel ammine complexes occurred with forming nickel hydroxide, carbonate and hydroxocarbonate ammines precursors. Composition of the precursors depended on temperature and ammonia content in initial complex. Mean crystallite

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Soulaine, Cyprien. "Modélisation des écoulements dans les garnissages structurés : de l'échelle du pore à l'échelle de la colonne." Thesis, Toulouse, INPT, 2012. http://www.theses.fr/2012INPT0089/document.

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Une colonne de séparation d'air réalise un écoulement liquide-gaz à contre courant dans une structure complexe, le garnissage. Au sein de ce garnissage, l'écoulement du liquide est du type film drainé par gravité, alors que l'écoulement du gaz est turbulent. La fonction de ces contacteurs est de développer une surface d'échange interfaciale aussi grande que possible pour favoriser le transfert d'un composé chimique de la phase liquide vers la phase vapeur (et inversement) tout en offrant des pertes de charge raisonnables. Ces dispositifs sont constitués par l'assemblage de plaques métalliques

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Singh, Kamaljit Engineering &amp Information Technology Australian Defence Force Academy UNSW. "Dynamics of residual non-aqueous phase liquids in porous media subject to freeze-thaw." Awarded by:University of New South Wales - Australian Defence Force Academy. Engineering & Information Technology, 2009. http://handle.unsw.edu.au/1959.4/44875.

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This project concerns the effect of freeze-thaw cycles on the pore-scale structure of nonaqueous phase liquid (NAPL) contaminants in water-saturated porous media. This problem is of critical importance to the entrapment of such contaminants in cold temperate, polar and high altitude regions, and has not been examined in the literature to date. This research work is conducted in three stages: (i) two-dimensional nondestructive visualisation of residual light non-aqueous phase liquid (LNAPL), and dense non-aqueous phase liquid (DNAPL), in porous media subject to successive freeze-thaw cycle

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