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Dissertations / Theses on the topic 'Phase transition'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Klintberg, Lena. "Miniature phase-transition actuators/." Uppsala : Acta Universitatis Upsaliensis : Univ.-bibl. [distributör], 2002. http://publications.uu.se/theses/91-554-5345-7/.

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2

Martin, Adrian Peter. "Cosmological phase transition phenomena." Thesis, University of Cambridge, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.389880.

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3

Haupt, Kerstin Anna. "Phase transitions in transition metal dichalcogenides studied by femtosecond electron diffraction." Thesis, Stellenbosch : Stellenbosch University, 2013. http://hdl.handle.net/10019.1/85608.

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Thesis (PhD)--Stellenbosch University, 2013.<br>ENGLISH ABSTRACT: Low-dimensional materials are known to undergo phase transitions to differently or- dered states, when cooled to lower temperatures. These phases often show a periodic modulation of the charge density (called a charge density wave – CDW) coupled with a periodic perturbation of the crystal lattice (called a periodic lattice distortion – PLD). Although many experiments have been performed and much has been learnt about CDW phases in low-dimensional materials, the reasons for their existence are still not fully understood yet

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4

Qasim, Ilyas. "Structural and Electronic Phase Transitions in Mixed Transition Metal Perovskite Oxides." Thesis, The University of Sydney, 2013. http://hdl.handle.net/2123/10029.

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The reported multiferroic perovskite series Sr1-xAxTi1/2Mn1/2O3 has been the subject of numerous structural studies, without reaching consensus. In the current work, the cubic Pm3 ̅m is confirmed for end member SrTi1/2Mn1/2O3 in the Sr1-xAxTi1/2Mn1/2O3 ( A= Ca, La; 0 ≤ x ≤ 1) series. The Pm3 ̅m  I4/mcm  Pbnm structural evolution was observed with increased doping level of Ca. A cubic Pm3 ̅m  rhombohedral R3 ̅c transition occurred when La is substituted instead of Ca. Interesting magnetic behaviours were observed and the major contribution to this was concluded to be the mixed Mn4+/M

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5

Dogbevia, Moses K. "Gas phase transition metal-cluster catalysis /." abstract and full text PDF (free order & download UNR users only), 2005. http://0-wwwlib.umi.com.innopac.library.unr.edu/dissertations/fullcit/3209128.

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Thesis (Ph. D.)--University of Nevada, Reno, 2005.<br>"August, 2005." Includes bibliographical references. Online version available on the World Wide Web. Library also has microfilm. Ann Arbor, Mich. : ProQuest Information and Learning Company, [2005]. 1 microfilm reel ; 35 mm.

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6

Sopena, Miguel. "Hydrodynamics of the electroweak phase transition." Thesis, University of Sussex, 2013. http://sro.sussex.ac.uk/id/eprint/45752/.

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This work investigates the hydrodynamics of the expansion of the bubbles of the broken symmetry phase during the electroweak phase transition in the early universe, in which SU(2) electroweak symmetry is broken and fundamental particles acquire mass through the Higgs mechanism. The electroweak phase transition has received renewed attention as a viable setting for the production of the matter-antimatter asymmetry of the universe. The relevant mechanisms are strongly dependent on key parameters like the expansion velocity of the walls of bubbles of the new phase. In addition, the key dynamical

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7

Wang, Changnan. "Gel phase transition and molecular recognition." Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/43921.

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8

Furukawa, Akira. "Phase Transition Dynamics of Complex Fluids." 京都大学 (Kyoto University), 2004. http://hdl.handle.net/2433/147797.

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9

Thein, Ferdinand [Verfasser]. "Results for two phase flows with phase transition / Ferdinand Thein." Magdeburg : Universitätsbibliothek, 2018. http://d-nb.info/1165650487/34.

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10

Arrachid, Abdessamad. "The phase transition analyzer : a tool to measure thermal transitions of biopolymers?" Thesis, University of Nottingham, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.435986.

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11

Eaglesham, D. J. "Charge density waves and their phase transitions in the transition metal chalcogenides." Thesis, University of Bristol, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.375017.

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12

Thompson, Ian. "Dynamic phase transitions in biased ensembles of particle systems with repulsive interactions." Thesis, University of Bath, 2015. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.665407.

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We study dynamic phase transitions in the constant-volume and constant- pressure ensembles of two different systems: a one-dimensional system of diffusive hard particles and a three-dimensional glass-former of nearly-hard repulsive particles. The dynamic transitions are observed using ensembles of trajectories biased with respect to their dynamic activity, biasing to greater or lower activities than equilibrium allows us to sample different dynamic phases. We perform finite-size scaling of the transitions with respect to sys- tem size and observation time, and compare them to first-order phase

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13

Ponton, Alain. "Transition phase micellaire, phase éponge induite par laser dans une microémulsion." Bordeaux 1, 1989. http://www.theses.fr/1989BOR10549.

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Il est montre qu'un faisceau laser pouvait piloter un changement de structure dans un melange quaternaire dilue en tensioactif. La transition est induite entre une phase micellaire et une phase birefringente. Elle se traduit par une hysteresis de l'autofocalisation du faisceau traversant le milieu, en fonction de la puissance

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14

Lavrskyi, Mykola. "Modélisation en fonctionnelle de la densité atomique des transformations de phases dans le système Fe-C à basse température." Thesis, Normandie, 2017. http://www.theses.fr/2017NORMR003/document.

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Cette thèse a été centrée sur l’étude de la formation d’une phase martensitique dans les aciersFe-Ni-C et sur la diffusion des atomes de carbone dans cette phase à basse température. Lamodélisation à l’échelle atomique a été utilisée. Pour décrire ces phénomènes, deux approchesont été développées: un modèle discret basé sur la théorie de la fonction de densité atomique(ADF) et une approche quasiparticulaire basée sur la théorie atomique de Fratons (AFT). Dansun premier temps, pour montrer l’universalité de notre approche, nous avons appliqué l'AFTpour modéliser la cinétique d'auto-assemblage d

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15

Du, Chengran. "Nonequilibrium phase transition in binary complex plasmas." Diss., lmu, 2013. http://nbn-resolving.de/urn:nbn:de:bvb:19-152752.

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16

Yamashita, Hiroki 1981. "Electroweak phase transition and singlet Majoron model." Thesis, McGill University, 2007. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=101691.

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First, we review the basics of baryogenesis and models for baryogenesis in the early literature. Then, we discuss the main theme in this thesis, electroweak baryogenesis, which utilizes the electroweak phase transition. We present how the phase transition can be used to achieve baryogenesis. Next, we develop our model, which is the Standard Model with a singlet field coupled to the Higgs doublet negatively and to the right-handed neutrinos. It is a simple extension of the singlet Majoron model. We focus on numerical analysis of the model. Parameter space satisfying all the conditions are found

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17

Butcher, C. "Gas-phase transition metal carbonyl cluster chemistry." Thesis, University of Cambridge, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.597163.

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The collision-induced dissociation (CID) of transition metal carbonyl clusters have been recorded and presented using the recently developed technique of energy-dependent electrospray ionisation mass spectrometry (EDESI). EDESI has been improved to incorporate breakdown graphs, allowing complete fragmentation data to be presented. EDESI spectra facilitate the assignment of all ligands, and assist in determining the composition of the cluster core. Electron autodetachment was observed upon ligand loss from multiply charged clusters. For certain clusters, a remarkable amount of structural inform

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18

Moon, Chang Man. "Molecular dynamics study of phase transition phenomena." Thesis, University of Edinburgh, 2000. http://hdl.handle.net/1842/12675.

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This computer simulation study carried out by classical the molecular dynamics technique (MD) investigates structural phase transitions of various atomic and molecular condensed matter systems. Particularly, our attention is focused on the signals for their observation. Classical nucleation theory is briefly reviewed in relation to the present study. An overall review is made on the methodology of the MD simulation technique such as the integration of the equations of motion, the rotational motion of molecules which is dealt with the four-component quaternion, and other various techniques invo

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19

Bukharaev, A. A., N. I. Nurgazizov, D. A. Biziaev, A. P. Chuklanov, and T. F. Khanipov. "Current-induced Phase Transition in Ni Nanowires." Thesis, Sumy State University, 2012. http://essuir.sumdu.edu.ua/handle/123456789/35343.

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The single ferromagnetic Ni nanowires connecting two contact pads on the silicon oxide surface were fabricated using the scanning probe nanolithography technique based on the nanoindentation of polymethylmethacrylate resist and lift-off process. Wires with height from 9 to 26 nm, wide from 200 to 500 and length from 5 to 13 m were obtained. The atomic and magnetic force microscopy was used to study the morphology and domain structure of the obtained nanowires. Multidomain and single-domain structures depending on the width of the nanowires were observed. Current-induced phase transition f

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20

Bentley, Christopher David. "The phase transition of poly(N-isopropylacrylamide)." Thesis, University of Liverpool, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.539714.

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21

Murray, Ryan. "Some Asymptotic Results For Phase Transition Models." Research Showcase @ CMU, 2016. http://repository.cmu.edu/dissertations/824.

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22

Choi, Man Yee. "Hygroscopicity and phase transition of atmospheric aerosols /." View abstract or full-text, 2004. http://library.ust.hk/cgi/db/thesis.pl?CENG%202004%20CHOI.

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23

Grant, Stuart Alexander. "Phase transition behaviour in constraint satisfaction problems." Thesis, University of Leeds, 1997. http://etheses.whiterose.ac.uk/1273/.

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Many problems in artificial intelligence and computer science can be formulated as constraint satisfaction problems (CSPs). A CSP consists of a set of variables among which a set of constraints are imposed, with a solution corresponding to an assignment for every variable such that no constraints are violated. Most forms of CSP are NP-complete. Recent research has shown that the CSP exhibits a phase transition as a control parameter is varied. This transition lies between a region where most problems are easy and soluble, and a region where most problems are easy but insoluble. In the interven

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24

Seto, Yusuke. "Composition, symmetry and phase transition of scapolite." 京都大学 (Kyoto University), 2005. http://hdl.handle.net/2433/145099.

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Kyoto University (京都大学)<br>0048<br>新制・課程博士<br>博士(理学)<br>甲第11333号<br>理博第2891号<br>新制||理||1431(附属図書館)<br>22976<br>UT51-2005-D84<br>京都大学大学院理学研究科地球惑星科学専攻<br>(主査)助教授下林典正, 教授北村雅夫, 教授嶋本利彦<br>学位規則第4条第1項該当

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25

Sarkar, Sudipta Kumar. "Phase transition in Binary Liquid Crystalline Mixtures." Thesis, University of North Bengal, 2017. http://hdl.handle.net/123456789/2674.

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26

Wang, Fang. "Quantum phase transitions and fluctuations in space charge doped one unit-cell Bi2Sr2CaCu2O8+x." Electronic Thesis or Diss., Sorbonne université, 2021. http://www.theses.fr/2021SORUS436.

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La transition supraconducteur-isolant en deux dimensions est une transition de phase quantique continue à la température du zéro absolu provoquée par des paramètres externes tels que le désordre, le champ magnétique ou la concentration de porteurs. De telles transitions ont été induites dans une variété de supraconducteurs bidimensionnels en ajustant différents paramètres externes et étudiées avec une analyse de renormalisation de taille finie. Il y a cependant assez peu d'uniformité dans les résultats car à la fois les systèmes supraconducteurs et les paramètres externes sont divers. Dans cet

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27

Mitra, Sunanda. "Chalcogenide of type I-V-VI₂ for thermoelectric applications." Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLS562/document.

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Ce travail de thèse porte sur une série d’échantillons de composition nominale AgBiSe2-xSx (avec x= 0 à 2), appartenant à la famille des chalcogénures ternaires de type I-V-VI₂. Les analyses structurales et thermiques ont mis en évidence une solution solide complète sans gap de miscibilité, et des transitions de phase pour toutes les compositions. Nous avons pu obtenir des composés monophasés à la fois des phases hexagonale et cubique, et notre étude de DRX en température à mis en évidence une phase rhomboédrique pour certaines compositions (x=1 à 2 dans AgBiSexS2-x). Les résultats de DSC ont

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28

Weber, Tobias [Verfasser]. "Dynamics at the Orbital Ordering Phase Transition in MgV2O4 and at the Ferromagnetic Phase Transition in MnSi / Tobias Weber." München : Verlag Dr. Hut, 2017. http://d-nb.info/1135596522/34.

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29

Endo, Tomoki. "Hadron-quark matter phase transition and the mixed phase in hybrid stars." 京都大学 (Kyoto University), 2006. http://hdl.handle.net/2433/144167.

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Kyoto University (京都大学)<br>0048<br>新制・課程博士<br>博士(理学)<br>甲第12084号<br>理博第2978号<br>新制||理||1444(附属図書館)<br>23920<br>UT51-2006-J79<br>京都大学大学院理学研究科物理学・宇宙物理学専攻<br>(主査)助教授菅沼秀夫, 教授中村卓史, 教授畑浩之<br>学位規則第4条第1項該当

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30

Mouri, Abdelkader. "Optimisation, caractérisation et comportement physico-chimique dans les milieux modèles de nano-objets en phase inverse." Thesis, Montpellier, 2016. http://www.theses.fr/2016MONTT207.

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Le projet de thèse, mené en collaboration avec le laboratoire Medesis Pharma, porte sur la mise au point de deux formulations pharmaceutiques, une microémulsion inverse et un gel colloïdal, à base de Pécéol®, lécithine, éthanol et eau. Le lithium indiqué dans le traitement de maladies neurodégénératives a été utilisé comme un modèle de principe actif hydrophile dans le cadre de ce projet. Ce travail a été initié par l’étude du comportement de phases du mélange quaternaire Pécéol®/lécithine/éthanol/eau, mettant essentiellement l’accent sur les différents paramètres impliqués dans les transition

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31

Mouri, Abdelkader. "Optimisation, caractérisation et comportement physico-chimique dans les milieux modèles de nano-objets en phase inverse." Electronic Thesis or Diss., Montpellier, 2016. http://www.theses.fr/2016MONTT207.

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Le projet de thèse, mené en collaboration avec le laboratoire Medesis Pharma, porte sur la mise au point de deux formulations pharmaceutiques, une microémulsion inverse et un gel colloïdal, à base de Pécéol®, lécithine, éthanol et eau. Le lithium indiqué dans le traitement de maladies neurodégénératives a été utilisé comme un modèle de principe actif hydrophile dans le cadre de ce projet. Ce travail a été initié par l’étude du comportement de phases du mélange quaternaire Pécéol®/lécithine/éthanol/eau, mettant essentiellement l’accent sur les différents paramètres impliqués dans les transition

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32

Impéror-Clerc, Marianne. "Étude de transition de phase vers les phases cubiques des systèmes eau/surfactant." Paris 11, 1992. https://tel.archives-ouvertes.fr/tel-01989797.

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Les phases cubiques des systèmes binaires eau/surfactant sont un cas d'organisation liquide-cristalline de la matière très surprenant. Leur structure allie, a un ordre local liquide, une périodicité tridimensionnelle à l'échelle mésoscopique, qui en fait de véritables cristaux de films fluides. Elle se caractérise également par une topologie bicontinue tout à fait remarquable. Partant de l'observation de la croissance en épitaxie d'une phase cubique (de groupe d'espace Ia3d, le plus fréquent) à partir des mésophases lamellaire et hexagonale, nous nous sommes attaches à décrire comment, d'un po

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33

Chu, Fan. "The ferroelectric phase transition in complex perovskite relaxors /." [S.l.] : [s.n.], 1994. http://library.epfl.ch/theses/?nr=1248.

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34

Takahashi, Katsunori. "SWELLING AND VOLUME PHASE TRANSITION OF POLYMER GELS." 京都大学 (Kyoto University), 2001. http://hdl.handle.net/2433/150686.

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35

Kamikado, Kazuhiko. "Chiral phase transition in QCD with critical fluctuation." 京都大学 (Kyoto University), 2013. http://hdl.handle.net/2433/175113.

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36

Falicki, Slawomir. "Two-phase system and transition metal catalyzed reactions." Thesis, University of Ottawa (Canada), 1990. http://hdl.handle.net/10393/5663.

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The first examples of the application of biphasic and phase transfer catalysis to early-transition-metal organometallic chemistry are described. These include very efficient and convenient syntheses of the ($\eta\sp5$-cyclopentadienyl)tricarbonylhydridovanadate anion under remarkably mild biphasic conditions. The latter is capable of effecting, under phase transfer conditions, the reduction of halides, sterically encumbered nitro compounds, and the cyclodehydration of $\alpha,\beta$-unsaturated ketones. The reactions may proceed via electron transfer pathways. The use of nickel cyanide under b

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37

Wehbe, Charbel. "Étude asymptotique de modèles en transition de phase." Thesis, Poitiers, 2014. http://www.theses.fr/2014POIT2311/document.

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Ce rapport de thèse est consacré à l'étude de modèles de champ de phase de type Caginalp. Nous considérons ici, deux parties : la première étant une généralisation du modèle de champ de phase de Caginalp basée sur la loi de Maxwell-Cattaneo et la seconde traite le même modèle dans sa version conservative. L'étude dans les deux parties est faite dans un domaine borné. De plus, dans la première partie on distingue les cas de conditions aux bords de type Dirichlet ainsi que Neumann, tandis que dans la deuxième partie le modèle est étudié uniquement avec les conditions Dirichlet (avec un potentiel

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38

Wincure, Benjamin 1966. "Computational modeling of a liquid crystal phase transition." Thesis, McGill University, 2007. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=103308.

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This thesis numerically solves the tensor order parameter continuum theory equations for nematic liquid crystals to investigate liquid crystal texturing mechanisms during an isotropic to nematic phase transition in a bulk unstable isotropic phase and next to solid surfaces. The Time Dependent Ginsburg Landau equation with a Landau de Gennes Helmholtz free energy density description is used to predict the shapes, textures and defect mechanisms that occur in the expanding droplets and films of a 4'-pentyl-4-cyanobiphenyl (5CB) nematic phase immediately after their nucleation from an unstable iso

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39

Swainson, Ian Peter. "The phase transition and dynamic disorder in cristobalite." Thesis, University of Cambridge, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.281903.

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40

Storey, Marianne. "Effect of disorder on the melting phase transition." Thesis, Imperial College London, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.322000.

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41

甄冠僑 and Koon-kiu Yan. "Phase transition of certain iterative cellular automation models." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1999. http://hub.hku.hk/bib/B42575382.

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42

Benson, Kevin E. C. "Aspects of the electroweak phase transition and baryogenesis." Thesis, University of Oxford, 1993. http://ora.ox.ac.uk/objects/uuid:27c64513-bbb7-4f94-b385-4e691354a7b5.

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In this thesis we study aspects of the cosmological electroweak phase transition which are relevant to the possibility of baryogenesis at this epoch. We focus on two issues: first, requiring that the observed baryon number be of electroweak origin places strong constraints on electroweak physics, and second, baryogenesis at the electroweak scale may be driven by an asymmetry generated at the GUT scale. We use the effective potential at finite temperature as a means of analyzing phase transitions associated with spontaneous symmetry breaking. We develop the theory with two basic examples: the s

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43

Goudochnikov, Pavel. "The cubic phase transition in 2:4 perovskites." Thesis, University of Leeds, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.417767.

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Daniels, Christopher. "On the phase transition in certain percolation models." Thesis, University of Bath, 2016. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.687311.

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Consider random sequential adsorption on a chequerboard lattice with arrivals at rate 1 on light squares and at rate λ on dark squares. Ultimately, each square is either occupied, or blocked by an occupied neighbour. Colour the occupied dark squares and blocked light sites black, and the remaining squares white. Independently at each meeting-point of four squares, allow diagonal connections between black squares with probability p; otherwise allow diagonal connections between white squares. We show that there is a critical surface of pairs (λ, p), containing the pair (1,0.5), such that for (λ,

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45

Yu, Xiaohong. "Polymer interactions and the phase transition of gels." Thesis, Massachusetts Institute of Technology, 1993. http://hdl.handle.net/1721.1/12451.

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46

Dunlap, Terrence L. "Nanoscale near-field imaging of VO2 phase transition." Thesis, California State University, Long Beach, 2015. http://pqdtopen.proquest.com/#viewpdf?dispub=1600042.

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<p> A large focus of this thesis was developing the experimental procedures involved in imaging <i>VO<sub>2</sub></i> during the heating process. In order to study light interactions between an induced dipole and a sample surface to collect various data on its topography, amplitude and phase. Data is collected using a near-eld microscope (s-SNOM) and analyzed using various software that, normalize, lter and display the data in false color image. Specically, research behind this thesis, focuses on the phase transition of Vanadium Dioxide (<i>VO<sub>2</sub></i>) as it goes from an insulating to

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47

MANDLER, JACQUES. "Sur la transition de phase de 3-sat." Paris 6, 2000. http://www.theses.fr/2000PA066530.

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Dans la premiere partie, nous explorons une nouvelle methode pour trouver les valeurs asymptotiques de sommes de nombres complexes du type s n = n k = 0f n (k). Posant f n(x) = f n (nx), nous avons constate empiriquement que souvent, dans des situations ou la methode du col s'applique a i (f n) = 1 0 f n (x) dx, la quantite ni (f n) constitue un equivalent asymptotique, voire exact de s n. Des exemples typiques sont des sommes alternees de nombres reels, et, contrairement a celles jusqu'ici connues, cette procedure semble d'application assez large. Des resultats partiels sont presentes en vue

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48

Возний, Андрій Андрійович, Андрей Андреевич Возный, Andrii Andriiovych Voznyi, Володимир Володимирович Косяк, Владимир Владимирович Косяк, and Volodymyr Volodymyrovych Kosiak. "Thermally induced phase transition in SnxSy thin films." Thesis, E-MRS (European Materials Research Society), 2016. http://essuir.sumdu.edu.ua/handle/123456789/46278.

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Presently, the earth-abundant and non-toxic SnS2 and SnS compounds could be considered as the promising optoelectronic material. This is due the fact that SnS2 has n-type conductivity, high carrier mobility and wide band gap of 2.2 eV. SnS2 films were obtained by the close-spaced vacuum sublimation method.

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Duflot-Flandrois, Véronique. "Signaux de transition de phase des systèmes finis." Caen, 2001. http://www.theses.fr/2001CAEN2069.

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Les transistions de phase sont des phénomènes communs à tous les systèmes en interaction. Pour des systèmes infinis, elles sont bien décrites par la thermodynamique mais celle-ci ne peut plus être utilisée pour des petits systèmes comme le noyau de l'atome. Nous proposons une approche de mécanique statistique, afin d'extraire les caractéristiques thermodynamiques des petits systèmes ouverts et soumis à des forces non saturantes. Nous nous concentrons en particulier sur la définition et la mise en évidence pour de tels systèmes d'une transition de phase de type liquide gaz. Nous définissons des

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Yan, Koon-kiu. "Phase transition of certain iterative cellular automation models." Click to view the E-thesis via HKUTO, 1999. http://sunzi.lib.hku.hk/hkuto/record/B42575382.

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