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Dissertations / Theses on the topic 'Inversion de phase transitionnel'

Author: Grafiati
Published: 4 June 2021
Last updated: 6 February 2022

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1

Barros, Frederico Macedo Fernandes. "Structuration and rheology of Pickering emulsions by the interaction of particles with different degrees of hydrophobicity." Thesis, Le Mans, 2016. http://www.theses.fr/2016LEMA1032.

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Les émulsions de Pickering ont suscité un intérêt croissant dans de nombreux domaines de la recherche en raison de leur grande stabilité et versatilité. Une attention particulière a été accordée à la fabrication des systèmes complexes et originaux qui peuvent être obtenus avec différentes particules. Cette étude a consisté dans l'analyse des différents paramètres physico-chimiques des particules, des milieux liquides et des systèmes dispersées, et leur relation avec le comportement mécanique et la structure des émulsions afin de prédire et de moduler les caractéristiques de ces dernières. Nous
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2

Deshpande, Kiran B. "Studies On Phase Inversion." Thesis, Indian Institute of Science, 2001. http://hdl.handle.net/2005/285.

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Agitated dispersions of one liquid in another immiscible liquid are widely used in chemical industry in operations such as liquid-liquid extraction, suspension polymerisation, and blending of polymers. When holdup of the dispersed phase is increased, in an effort to increase the productivity, at a critical holdup, the dispersed phase catastrophically becomes the continuous phase and vice versa. This phenomenon is known as phase inversion. Although the inversion phenomenon has been studied off and on over the past few decades, the mechanism of phase inversion (PI) has yet not become clear. The
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3

Kazeem, Akintunde. "Flow induced phase inversion emulsification." Thesis, University of Nottingham, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.267627.

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4

Garach, Ravindra Mahendrakumar. "Robust phase sensitive inversion recovery imaging." Texas A&M University, 2005. http://hdl.handle.net/1969.1/2574.

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Inversion Recovery (IR) is a powerful tool for contrast manipulation in Mag- netic Resonance Imaging (MRI). IR can provide strong contrast between tissues with different values of T1 relaxation times. The tissue magnetization stored at an IR image pixel can take positive as well as negative values. The corresponding polarity information is contained in the phase of the complex image. Due to numerous factors associated with the Magnetic Resonance (MR) scanner and the associated acquisition system, the acquired complex image is modulated by a spatially varying background phase which makes the re
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5

Seidshazileh, Kazem. "Effect of interfacial characteristics on phase inversion." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0029/NQ63484.pdf.

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6

Saw, Lin K. "Phase inversion in polyurethane prepolymer-water dispersions." Thesis, Loughborough University, 2000. https://dspace.lboro.ac.uk/2134/15350.

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Aqueous polyuethane (PU) colloids, like many other water-borne polymer colloids, have become an increasingly important class of materials in the surface coating industry. Three processing stages, the pre-dispersion, dispersion and postdispersion stages, are generally involved in the production of aqueous PU colloids. However, existing researches have neglected the importance of the dispersion stage. The present study aims to develop better understanding of the dispersion stage during the production of aqueous PU colloids. Non chain-extendable PU pre-polymer (PUp) is used to enable independent
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7

Rondón, González Marianna Choplin Lionel. "Inversion de phase d'émulsions induite par agitation." S. l. : S. n, 2007. http://theses.abes.fr/2007INPL017N.

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8

Ngan, K. H. "Phase inversion in dispersed liquid-liquid pipe flow." Thesis, University College London (University of London), 2011. http://discovery.ucl.ac.uk/1318099/.

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This thesis presents the experimental and theoretical investigations on the development of phase inversion in horizontal pipeline flow of two immiscible liquids. It aims to provide an understanding on the flow development across the phase inversion transition as well as the effect on pressure drop. Experimental investigation on phase inversion and associated phenomena were conducted in a 38mm I.D. liquid pipeline flow facility available in the Department of Chemical Engineering at University College London (UCL). Two sets of test pipelines are constructed using stainless steel and acrylic. The
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9

Richmond, Howard N. "Phase inversion in nonionic surfactant-oil-water systems." Thesis, Loughborough University, 1992. https://dspace.lboro.ac.uk/2134/14713.

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This study has been concerned with the inversion of water in oil (W/0) emulsions, to oil in water (O/W) emulsions and vice-versa. It has been shown that there are two types of emulsion phase inversion that can occur in nonionic Surfactant-Oil-Water (nSOW) systems: (i) A "transitional" inversion, which is brought about by changing the nSOW phase behaviour, by altering the surfactant's affinity for the oil and water phases and, (ii) a "catastrophic" inversion, induced by increasing the dispersed phase fraction and occurs at closest packing of unstable dispersed phase drops. The inversion mechani
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10

Lefsaker, Martine. "Characterization of alkyd emulsions : Characterization of phase inversion and emulsification properties pre- and post-inversion." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for kjemisk prosessteknologi, 2013. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-22425.

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This report presents the results of work performed in cooperation with the Binding lab (Jotun AS) and the Colloid and Polymer Chemistry group at Department of Chemical Engineering, Norwegian University of Science and Technology (NTNU).The research performed is on the emulsification process of alkyds by catastrophic phase inversion (CPI). Focus has been on the development of emulsion properties such as viscosity, conductivity and optical density, during the emulsification process. The definition of properties at inversion point, from a water-in-oil (w/o) to an oil-in-water (o/w) continuous emul
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11

Hashemi-Zahan, Saeid. "Inversion of non-minimum phase systems in signal processing." Thesis, University of Southampton, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.266944.

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12

Marino, Helene. "Phase inversion temperature emulsification : from batch to continuous process." Thesis, University of Bath, 2010. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.533407.

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13

Shah, Nikhil. "Seismic 'Full Waveform Inversion' of wrapped and unwrapped phase." Thesis, Imperial College London, 2013. http://hdl.handle.net/10044/1/24849.

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Full Waveform Inversion (FWI) is a highly promising but far from robust and stable optimisation for computing the subsurface velocity model from seismic data acquired with long offsets and low frequencies. Mathematically, it solves the non-linear problem of matching model-predicted data to observed data with an iterative localised minimisation of the misfit. Therefore it is necessarily restricted by the need for an accurate starting model. In this thesis, we look at being able to relax the constraints on the starting model in FWI, obtain lower wavenumber updates from FWI, and in the process di
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14

Faulkner, Helen Mary Louise. "Studies in phase and inversion problems for dynamical electron diffraction." Connect to thesis, 2003. http://repository.unimelb.edu.au/10187/2880.

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This thesis examines problems in electron diffraction and related areas of theoretical optics. It begins with a study of the phase of a quantum mechanical wave function and the behaviour of phase vortices and vortex cores. Several rules for vortex core evolution are given and simulated vortex trajectories are studied. These simulations show that in electron microscopy at atomic resolution and in other similar situations, vortices occur in the wave functions very frequently. This means any image processing methods which deal with the wave function phase must permit vortices to occur. In this co
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15

Al-Qutbi, A. A. A. "Study of inclusion in phase inversion emulsification and multiple emulsions." Thesis, London South Bank University, 2018. http://researchopen.lsbu.ac.uk/2328/.

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The phenomenon of ‘inclusion’ in emulsions refers to the inclusion of continuous phase into the dispersed phase drops and formation of multiple drops due to the tendency of the inner phase to stabilise the outer phase. Inclusion plays an important role in both catastrophic phase inversion (CPI) emulsification process and preparation of multiple emulsions. In CPI, inclusion leads to formation of abnormal multiple drops, which eventually invert to the opposite desired normal emulsion. On the other hand, in multiple emulsions, inclusion may have an adverse effect leading to instability of the mul
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16

Ioannou, Karolina. "Phase inversion phenomenon in horizontal dispersed oil/water pipeline flows." Thesis, University College London (University of London), 2006. http://discovery.ucl.ac.uk/1445603/.

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This thesis reports on experimental and theoretical investigations relevant to the understanding of the phenomenon of phase inversion and its effect on pressure drop during dispersed flow of two immiscible liquids in horizontal pipelines. Experimental studies of phase inversion and associated phenomena were carried out in the liquid flow facility in the Department of Chemical Engineering at University College London (UCL), and at the Norwegian University of Science and Technology, Trondheim, Norway (NTNU). Detailed local conductivity measurements have been obtained at UCL (using conductivity r
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17

Hu, Bin. "Experimental and theoretical investigation of phase inversion in liquid-liquid dispersions." Thesis, University College London (University of London), 2006. http://discovery.ucl.ac.uk/1445590/.

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This thesis describes an experimental and theoretical investigation of phase inversion in concentrated liquid-liquid dispersions, as part of a joint project between University College London (UCL) and Imperial College London (ICL). Experimental studies of phase inversion behaviour and associated phenomena in pipeline flows were carried out on the Water-Oil Liquid Flow (WOLF) facility at the Department of Chemical Engineering at UCL. Two inversion routes (w/o to o/w and o/w to w/o) were followed to elucidate the hysteresis effect in pipeline flows in both upward and downward flows at either con
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18

Yeo, Leslie Yu-Ming. "Modelling of phase inversion and associated phenomena in liquid-liquid systems." Thesis, University of London, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.480683.

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19

Efthimiadu, Irini. "Phase inversion of liquid-liquid dispersions produced by shear or turbulence." Thesis, University of Birmingham, 1990. http://etheses.bham.ac.uk//id/eprint/8474/.

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The purpose of the research was the investigation of the phase-inversion phenomenon in liquid-liquid dispersions by examining the various parameters that could affect it, trying to understand its mechanism and draw some general conclusions on the behaviour of liquid-liquid dispersions in relation to it. The experimental investigation of phase inversion was done by using two different methods to produce the liquid-liquid dispersions. In the first method, the dispersions were produced by shearing the liquids between two parallel plates, one rotating and the other being stationary. In the second
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20

Jack, U. "Fabrication of wet phase inversion capillary membrane, dimension and diffusion effects." Thesis, Cape Peninsula University of Technology, 2006. http://hdl.handle.net/20.500.11838/895.

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Thesis (MTech (Chemical Engineering))--Cape Peninsula University of Technology, 2006<br>A protocol already exists for fabrication of a capillary membrane having an internal ultrafiltration skin supported by a finger-like pore structure in the external capillary wall (Jacobs and Leukes, 1996; Jacobs and Sanderson, 1997). These membranes have been produced at the Institute of Polymer Science, University of Stellenbosch, South Africa. Two major applications emerged from the development of these internally skinned membranes. One application was in the production of potable water by Ultra-filt
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21

Arnautu, Monica. "Systèmes polymères multiphasés obtenus par polymérisation hétérogène avec inversion de phase." Montpellier 2, 2001. http://www.theses.fr/2001MON20076.

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22

Mthwesi, Zuko. "Thermoluminescence of synthetic quartz annealed beyond its second phase inversion temperature." Thesis, Rhodes University, 2017. http://hdl.handle.net/10962/46077.

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Thermoluminescence of synthetic quartz annealed at 1000 ºC for 10 minutes has been studied. The aim was to study mechanisms of thermoluminescence in annealed synthetic quartz and to discuss the results in terms of the physics of point defects. The sample was irradiated with a beta dose of 10 Gy of beta radiation and then heated at a linear heating rate of 1 ºC.s-1 up to 500 ºC. The thermoluminescence (TL) glow curve consists of three glow peaks. Peak I at 74 0C (main peak) with high intensity as compared to the other two peaks. Peak II at 144 ºC is more intense than peak III at 180 ºC. This st
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23

Dauvergne, Jean-Luc. "Réduction et inversion de modèles de conduction thermique avec changement de phase." Bordeaux 1, 2008. http://www.theses.fr/2008BOR13616.

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"Ce travail porte sur la réduction et l'inversion de problèmes de conduction avec changement de phase. Nous proposons dans un premier temps différentes méthodes permettant de réduire efficacement ces problèmes fortement non linéaires. Il s'agit, pour la plupart, de méthodes spectrales "a priori" reposant sur la troncature de la base singulière. On distingue dans ce travail trois cas de figure. Le premier implique des conductivités thermiques indentiques en phases solide et liquide. Le second lève cette restriction de conductivités thermiques constantes mais impose des conditions aux limites pa
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24

Galindo, Alvarez Johanna Maria. "Étude de l'inversion de phase catastrophique lors de l'émulsification de produits visqueux." Thesis, Vandoeuvre-les-Nancy, INPL, 2008. http://www.theses.fr/2008INPL015N/document.

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Ce travail porte sur la description et la compréhension de l’inversion de phase catastrophique utilisée pour l’émulsification de produits visqueux, à travers l’analyse des effets de formulation et de procédé sur la fraction de phase dispersée à laquelle le processus se produit et sur les mécanismes mis en jeu. Les suivis rhéologique et conductimétrique simultanés in situ de l’émulsification ont permis, du point de vue procédé, de mettre en avant l’influence du débit d’addition de la phase aqueuse sur la formation d’émulsions multiples du type e/H/E lesquelles, en augmentant notablement la frac
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25

Lai, Carlo Giovanni. "Simultaneous inversion of Rayleigh phase velocity and attenuation for near-surface site characterization." Diss., Georgia Institute of Technology, 1998. http://hdl.handle.net/1853/20748.

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26

BOUDIN, FRANCOIS. "Etude d'accumulateurs lithium-polymere comportant des electrolytes gelifies elabores par inversion de phase." Paris 6, 1998. http://www.theses.fr/1998PA066040.

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Deux types d'electrolytes polymeres pour batteries au lithium ont ete etudies au cours de cette these. D'une part, des gels ont ete elabores par voie thermique et une attention particuliere a ete portee au gel de polyacrylonitrile (pan). Les caracteristiques mecaniques et electrochimiques de ce materiau ont ete evaluees et comparees a d'autres electrolytes polymeres. La structure polyphasique (canaux d'electrolyte liquide au sein d'une matrice polymere) de ce gel a aussi ete mise en evidence. D'autre part, un nouvel electrolyte gelifie comportant une matrice microporeuse de polyfluorure de vin
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27

Beaudet, Sylvie. "Réactions de transfert de charge en phase gazeuse : charge-stripping et inversion de charge /." [S.l.] : [s.n.], 1993. http://library.epfl.ch/theses/?display=detail&nr=1140.

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28

Puysségur, Béatrice. "Compensation du délai de phase atmosphérique en interférométrie radar et inversion de vitesses tectoniques." Paris, Institut de physique du globe, 2006. http://www.theses.fr/2006GLOB0016.

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Cette étude propose un filtre de la composante troposphérique eninterférométrie différentielle d'images satellites radar (DInSAR) et uneméthode d'exploitation de séries d'interférogrammes pour l'étude desdéformations tectoniques lentes (inter et post sismiques). La contributioncohérente de l'atmosphère et le bruit résultant de la perte de cohérencetemporelle sont deux limites majeures de l'interférométrie. La composanteatmosphérique est variable spatialement et temporellement et son amplitudede l'ordre du signal tectonique. Le délai atmosphérique est la somme dudélai ionosphérique, qui n'a pas
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29

Royer, Maxime. "Émulsifiants biosourcés et émulsification de résines de peinture végétalisées." Thesis, Lille 1, 2016. http://www.theses.fr/2016LIL10069.

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Dans le contexte des problématiques environnementales, la mise en émulsion de résines biosourcées constitue une étape clé vers la production de « peintures vertes ». L’hydrophobie de deux résines alkydes d’origine végétale a été évaluée par une méthode novatrice appelée salinity-slope en réalisant un balayage en sel d’un système E/H/TA ionique. Les résultats ont montré que la neutralisation des résines modifie leur polarité, les rendant moins hydrophobes. L’hydrophilie de 27 tensioactifs a par ailleurs été évaluée par PIT-slope permettant d’une part de montrer l’extensivité de cette méthode et
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30

Paulo, João Bosco Araujo de. "Mise au point d'un nouveau mélangeur-décanteur à inversion de phase. Application à l'extraction du cuivre." Toulouse, INPT, 1996. http://www.theses.fr/1996INPT019G.

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Ce travail porte sur la mise au point d'un nouveau type de melangeur-decanteur dit a inversion de phase, dans le but de developper un appareil plus compact notamment en cherchant a reduire le volume du compartiment destine a la separation des phases a ameliorer l'efficacite de separation. Le principe repose sur une inversion de phase produite au niveau d'un plateau perfore qui separe les chambres de melange et de decantation. Dans le melangeur, on fabrique une dispersion du type o/w. Quand elle passe a travers du plateau perfore, on forme alors des gouttes d'eau contenant des gouttelettes orga
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31

Tomietto, Pacôme. "Contribution des polyhydroxyalcanoates (PHA) dans l'élaboration de matériaux membranaires pour des séparations en phase liquide." Thesis, Rennes 1, 2020. http://www.theses.fr/2020REN1S034.

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Les procédés membranaires sont aujourd'hui largement utilisés dans différents secteurs d'application, comme le traitement de l'eau ou les industries pharmaceutique et agroalimentaire. En comparaison aux autres technologies de séparation, la filtration membranaire a l'avantage d'être économe en énergie, de ne pas nécessiter l'utilisation de produits chimiques supplémentaires et d'être facilement mise à l'échelle du procédé. Cependant, les procédés d'inversion de phase, couramment utilisés pour la fabrication de membranes polymères, sont souvent nocifs pour l'environnement. En effet, ils utilise
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32

Botero, Cristina Ph D. Massachusetts Institute of Technology. "The Phase Inversion-based Coal-CO₂ Slurry (PHICCOS) feeding system : design, coupled multiscale analysis, and technoeconomic assessment." Thesis, Massachusetts Institute of Technology, 2014. http://hdl.handle.net/1721.1/87964.

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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2014.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 201-212).<br>The continuous conveying of a solid feedstock like pulverized coal into a pressurized environment is a challenging task required in multiple industrial processes. Plants based on pressurized, entrained-flow gasifiers (EFG) are a good example. EFGs are used to produce synthetic gas for the production of synthetic transportation fuels, chemicals, and for generating electricity in Integrated Gasificat
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33

Pizzino, Aldo. "Inversion de phase des émulsions : relation avec le comportement à l'équilibre et détection par rétrodiffusion de lumière." Thesis, Lille 1, 2008. http://www.theses.fr/2008LIL10054.

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L'inversion de phase des émulsions est un processus employé dans de nombreux procédés industriels, pour obtenir des émulsions très fines. Le suivi de l'inversion et la compréhension des phénomènes physico-chimiques mis en jeu constituent donc des enjeux majeurs pour maîtriser la formation et la stabilité des émulsions. Notre travail a porté sur l'étude de l'inversion de phase induite par le changement de température de systèmes de type CiEj / n-alcane / Eau (+NaCl). En premier lieu, nous avons mis au point une méthode de détection de l'inversion par mesure du signal de rétrodiffusion de lumièr
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34

Barroilhet, Cahuas Leonardo. "Phase inversion and wettability in testing the extender oil for the flotation of coarse potash ore fractions." Thesis, University of British Columbia, 2015. http://hdl.handle.net/2429/54778.

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The effects of amines on the phase inversion of oil/NaCl-KCl saturated-brine emulsions stabilized by KCl particles and on the wettability of KCl surfaces in brine were investigated. Contact angle at the oil/saturated-brine/KCl line of contact, interfacial tension at the oil/saturated-brine interface, and phase inversion measurements were performed to study the applicability of the phase inversion method in the selection of the extender oil(s) for subsequent coarse potash ore flotation tests. Two commercial amines, dodecyl and octadecyl, and two technical amines, TD and HTD, were tested as addi
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35

Solorio, Luis Jr. "Application of Ultrasound Imaging for Noninvasive Characterization of Phase Inverting Implants." Case Western Reserve University School of Graduate Studies / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=case1332258338.

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36

Karabelli, Duygu. "Séparateurs macroporeux innovants à base de poly(fluorure de vinylidène) pour supercondensateurs." Phd thesis, Université de Grenoble, 2011. http://tel.archives-ouvertes.fr/tel-00680737.

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La technologie supercondensateur a fait l'objet d'un grand intérêt ces dernières années. Cependant, tandis qu'une grande attention a été donnée aux électrodes, aux électrolytes et aux électrolytes de polymère gélifiée, peu d'études ont été centrées sur l'amélioration des séparateurs macroporeux. Dans le cadre du projet SEPBATT/DURAMAT, les séparateurs macroporeux à base de poly(fluorure de vinylidène) (PVdF) ont été préparés par inversion de phase, pour les supercondensateurs. Nos membranes présentent également une bonne stabilité thermique, en revanche leurs propriétés mécaniques sont signifi
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37

Stachlewska, Iwona Sylwia. "Investigation of tropospheric arctic aerosol and mixed-phase clouds using airborne lidar technique." Phd thesis, Universität Potsdam, 2005. http://opus.kobv.de/ubp/volltexte/2006/698/.

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An Airborne Mobile Aerosol Lidar (AMALi) was constructed and built at Alfred-Wegener-Institute for Polar and Marine Research (AWI) in Potsdam, Germany for the lower tropospheric aerosol and cloud research under tough arctic conditions. The system was successfully used during two AWI airborne field campaigns, ASTAR 2004 and SVALEX 2005, performed in vicinity of Spitsbergen in the Arctic. The novel evaluation schemes, the Two-Stream Inversion and the Iterative Airborne Inversion, were applied to the obtained lidar data. Thereby, calculation of the particle extinction and backscatter coefficient
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38

Li, Biao. "Hydrophobic-Hydrophilic Separation Process for the Recovery of Ultrafine Particles." Diss., Virginia Tech, 2019. http://hdl.handle.net/10919/103278.

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The demands for copper and rare earth elements (REEs) in the U.S. will keep rising due to their applications in green energy technologies. Meanwhile, copper production in the U.S. has been declining over the past five years due to the depletion of high-grade ore deposits. The situation for REEs is worse; there is no domestic supply chain of REEs in the U.S. since the demise of Molycorp, Inc. in 2016. Studies have shown that the rejected materials from copper and coal processing plants contain significant amounts of valuable metals. As such, this rejected material can be considered as potential
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Wang, Nian. "Intrinsic versus extrinsic seismic anisotropy." Paris, Institut de physique du globe, 2014. http://www.theses.fr/2014GLOB0101.

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40

Paugam, Lydie. "Contribution à l'étude de l'élimination des ions nitrates par nanofiltration." Rennes 1, 2002. http://www.theses.fr/2002REN10074.

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En Bretagne particulièrement, les teneurs en nitrates dans la ressource en eau ont atteint un niveau très préoccupant et dépassent trop souvent la norme admise. Pour la distribution d'une eau de qualité, il s'avère indispensable d'éliminer cette pollution de façon immédiate. La nanofiltration est un procédé membranaire dont nous avons voulu étudier le potentiel en tant qu'alternative aux méthodes de traitement conventionnelles. Le travail expérimental s'est divisé en deux parties. Dans la première nous avons mis en évidence l'influence de la nature de l'eau à traiter sur l'efficacité de l'élim
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41

Peiponen, K. E. (Kai-Erik). "Optical spectra analysis of turbid liquids." Doctoral thesis, University of Oulu, 2009. http://urn.fi/urn:isbn:9789514291685.

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Abstract This thesis is devoted to methods of analyzing optical spectra obtained from turbid liquids, i.e., liquids that are optically very thick and/or scatter light. Data for spectral analysis were obtained with a new, multifunction spectrophotometer developed for industrial liquid samples. One characteristic of the spectrophotometer is that spectral analysis methods can be implemented into the software. Here, the emphasis was on data inversion methods, particularly the Kramers-Kronig analysis and the maximum entropy method, which can be used to gain information on the wavelength-dependent c
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42

Schneider, Alice [Verfasser], Claus A. M. [Akademischer Betreuer] Seidel, and Rybinski Wolfgang [Akademischer Betreuer] von. "Mechanismen der Catastrophic Phase Inversion in Emulsionen aus Polydimethylsiloxanen und Wasser / Alice Schneider. Gutachter: Claus A. M. Seidel ; Wolfgang von Rybinski." Düsseldorf : Universitäts- und Landesbibliothek der Heinrich-Heine-Universität Düsseldorf, 2012. http://d-nb.info/101920205X/34.

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43

Brini, Ahmed Salem Kalifa. "A study of gas lift on oil/water flow in vertical risers." Thesis, Cranfield University, 2014. http://dspace.lib.cranfield.ac.uk/handle/1826/8507.

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Gas lift is a means of enhancing oil recovery from hydrocarbon reservoirs. Gas injected at the production riser base reduces the gravity component of the pressure drop and thereby, increases the supply of oil from the reservoir. Also, gas injection at the base of a riser helps to mitigate slugging and thus, improving the performance of the topside facility. In order to improve the efficiency of the gas lifting technique, a good understanding of the characteristics of gas-liquid multiphase flow in vertical pipes is very important. In this study, experiments of gas/liquid (air/water) two-phase f
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Colmanetti, Alex Roger Almeida. "Estudo experimental de escoamento multifásico em duto anular de grande diâmetro." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/18/18147/tde-17022017-164102/.

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Escoamentos gás-líquido assim como escoamento líquido-líquido-gás em duto de geometria anular estão presentes em muitas aplicações industriais, por exemplo, em poços de petróleo direcionais. No entanto, até mesmo características globais de escoamento gás-líquido nessa geometria, como os padrões de escoamento ou gradiente de pressão, não são ainda totalmente compreendidas. E ainda, informações são escassas quando se refere a escoamento trifásico nessa geometria, cuja aplicação está relacionada ao fenômeno de inversão de fase, que é de extrema importância não apenas para ao setor petrolífero, co
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45

Snisarenko, Dmytro. "Preparation and characterization of microfiltration flat polymeric membranes for biomedical applications." Master's thesis, Faculdade de Ciências e Tecnologia, 2013. http://hdl.handle.net/10362/10421.

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Dissertation presented to Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa for obtaining the master degree in Membrane Engineering<br>The optimal methodology for flat supported hydrophobic microporous poly(vinylidene) fluoride (PVDF) industrial membranes (Fortex 0.1, Fortex 0.2, Fortex 1.2 and Fortex 3.0) production were developed with implementation of wet phase-inversion technique. The effect of different indicators of the production conditions, such as composition of polymer solution, quantity and type of additives, dissolving temperature, composition and temperature of the c
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46

Desroches, Damien. "Extraction de hauteurs d'eau géolocalisées par interférométrie radar dans le cas de SWOT." Thesis, Toulouse 3, 2016. http://www.theses.fr/2016TOU30030/document.

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La mission SWOT (Surface Water and Ocean Topography), menée par le CNES et le JPL et dont le lancement est prévu pour 2020, marque un tournant majeur pour l'altimétrie spatiale, à la fois en océanographie et en hydrologie continentale. Il s'agit de la première mission interférométrique SAR dont l'objectif spécifique est la mesure de la hauteur des eaux. L'instrument principal de la mission, KaRIn, un radar interférométrique en bande Ka, présente des caractéristiques particulières : angle de visée proche du nadir (0.6 à 3.9°), faible longueur d'onde (8.6 mm) et courte base stéréoscopique (10 m)
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Andrén, Daniel. "On the Ising problem and some matrix operations." Doctoral thesis, Umeå universitet, Institutionen för matematik och matematisk statistik, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-1129.

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The first part of the dissertation concerns the Ising problem proposed to Ernst Ising by his supervisor Wilhelm Lenz in the early 20s. The Ising model, or perhaps more correctly the Lenz-Ising model, tries to capture the behaviour of phase transitions, i.e. how local rules of engagement can produce large scale behaviour. Two decades later Lars Onsager solved the Ising problem for the quadratic lattice without an outer field. Using his ideas solutions for other lattices in two dimensions have been constructed. We describe a method for calculating the Ising partition function for immense square
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Liu, Yang Verfasser], Olivier [Akademischer Betreuer] Guillon, and Joachim [Akademischer Betreuer] [Mayer. "Preparation and characterization of SrTiO$_3}$ oxygen transport membranes and asymmetric membranes prepared by phase inversion tape casting / Yang Liu ; Olivier Guillon, Joachim Mayer." Aachen : Universitätsbibliothek der RWTH Aachen, 2018. http://d-nb.info/1187346888/34.

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Venault, de Bourleuf Antoine. "Elaboration d'hydrogels composites chitosane/charbon actif à visée cicatrisante par procédés d'inversion de phase." Thesis, Montpellier 2, 2010. http://www.theses.fr/2010MON20048/document.

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Des hydrogels composites de chitosane et de charbon actif ont été préparés par séparation de phase induite par (i) contact de la solution de polymère avec une solution aqueuse de non-solvant (procédé par immersion) et (ii) pénétration de vapeurs de non-solvant dans la solution de polymère (procédé VIPS). La caractérisation multi-échelle (SAXS, WAXS, MEBE, module élastique, tests de diffusion) des gels a montré que le mode de contact n'avait pas d'influence sur les propriétés fonctionnelles des gels. Les structures obtenues sont homogènes, poreuses et amorphes. Elles conviennent pour constituer
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YU, JING-ZHE, and 俞景哲. "The inverstigation phase separation and phase inversion in polyurethane elastomers." Thesis, 1991. http://ndltd.ncl.edu.tw/handle/42728942194686493188.

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