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Dissertations / Theses on the topic 'Transition de phase superradiante'

Author: Grafiati

Published: 4 June 2021

Last updated: 7 February 2022

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1

Baksic, Alexandre. "Transitions de phase quantiques dans le régime de couplage ultrafort de l'electrodynamique quantique." Paris 7, 2014. http://www.theses.fr/2014PA077165.

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L'electrodynamique quantique est une discipline qui s'intéresse à l'interaction de la lumière et de la matière à l'échelle atomique. En plaçant des atomes au sein d'une cavité optique, il est possible d'augmenter l'amplitude de leur interaction avec les fluctuations du vide du champ électromagnétique. Il est même possible de l'augmenter d'une façon telle qu'une transition de phase quantique "superradiante" ait lieu, le système passant d'un état dit normal (vide de photons et atomes dans leur état fondamental) à un état dit superradiant (présence de photons et d'excitations atomiques au sein de

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2

Li, Benliang. "Cavity QED of superradiant phase transition in two dimensional materials." Thesis, University of Southampton, 2018. https://eprints.soton.ac.uk/427724/.

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In modern physics, the investigation of the interaction between light and matter is important from both a fundamental and an applied point of view. Cavity quantum electrodynamics (cavity QED) is the study of the interaction between light confined in a reflective cavity and atoms or other particles where the quantum nature of light photons is significant. The strong interaction between an exciton and cavity photon in a high-finesse microcavity can induce a hybrid light-matter eigenstate which is usually named as polariton in solid-state systems. This strong light-matter interaction can be achie

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3

Nataf, Pierre. "ELECTRODYNAMIQUE QUANTIQUE DE CIRCUIT EN REGIME DE COUPLAGE ULTRAFORT." Phd thesis, Université Paris-Diderot - Paris VII, 2011. http://tel.archives-ouvertes.fr/tel-00761055.

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En Electrodynamique Quantique en Cavité (" Cavity QED "), l'interaction entre la transition atomique et le champ de la cavité est quantifiée par la fréquence de Rabi du vide. L'expression analogue " circuit QED " a été introduite pour certains circuits supraconducteurs contenant des Jonctions Josephson, parce qu'ils pouvaient se comporter comme des atomes artificiels couplés au mode bosonique du résonateur. Dans le régime où la fréquence de Rabi du vide est comparable à la fréquence de transition du système à deux niveaux, des transitions de phases quantiques superradiantes ont été prédites po

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4

Hayn, Mathias [Verfasser], Tobias [Akademischer Betreuer] Brandes, Tobias [Gutachter] Brandes, and Cristiano [Gutachter] Ciuti. "On superradiant phase transitions in generalised Dicke models : quantum and thermal phase transitions in the lambda-model / Mathias Hayn ; Gutachter: Tobias Brandes, Cristiano Ciuti ; Betreuer: Tobias Brandes." Berlin : Technische Universität Berlin, 2017. http://d-nb.info/1156010446/34.

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5

Thurtell, Tyler. "Slow and Stopped Light with Many Atoms, the Anisotropic Rabi Model and Photon Counting Experiment on a Dissipative Optical Lattice." Miami University / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=miami1533592687000267.

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6

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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7

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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8

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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9

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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10

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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11

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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12

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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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

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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15

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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16

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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17

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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18

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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19

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

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20

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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21

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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22

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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23

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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24

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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25

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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26

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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27

Powell, James Alan. "Nonlinear fronts near a first-order phase transition." Diss., The University of Arizona, 1990. http://hdl.handle.net/10150/185055.

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Arguments are presented for understanding the selection of speed and the nature of the fronts which join stable and unstable states on both the subcritical and the supercritical side of first order phase transitions. Subcritically, a unique front exists for a given set of parameter values, corresponding to a unique connection between metastable states. In the phase space of the Galilean ODE, uniqueness arises from the non-perturbability of a connection between saddle points corresponding to plane waves and ground states. Unique connections are shown to be special solutions which have the Painl

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28

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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29

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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30

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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31

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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32

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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33

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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34

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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35

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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36

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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37

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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38

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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39

Arai, Yuko. "Volume phase transition of thermotropic liquid crystalline gels." 京都大学 (Kyoto University), 2005. http://hdl.handle.net/2433/144885.

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40

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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41

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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42

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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43

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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44

Neusser, Jochen [Verfasser]. "Numerical Approximation of Two-Phase Flows with and without Phase Transition / Jochen Neusser." München : Verlag Dr. Hut, 2016. http://d-nb.info/1100967869/34.

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45

Ahriche, Amine. "The electroweak phase transition in models with gauge singlets." [S.l.] : [s.n.], 2007. http://deposit.ddb.de/cgi-bin/dokserv?idn=983917485.

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46

Muixí, Ballonga Alba. "Locally adaptive phase-field models and transition to fracture." Doctoral thesis, Universitat Politècnica de Catalunya, 2020. http://hdl.handle.net/10803/669747.

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This thesis proposes a new computational model for the efficient simulation of crack propagation, through the combination of a phase-field model in small subdomains around crack tips and a discontinuous model in the rest of the domain. The combined model inherits the advantages of both approaches. The phase-field model determines crack propagation at crack tips, and the discontinuous model explicitly describes the crack elsewhere, enabling to use a coarser discretization and thus reducing the computational cost. In crack-tip subdomains, the discretization is refined to capture the phase-fiel

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47

Hallberg, Per. "On Phase Transition and Percolation in the Beach Model." Licentiate thesis, KTH, Mathematics, 2002. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-1555.

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<p>The beach model, which was introduced by Burton and Steif,has many features in common with the Ising model. We generalizesome results for the Ising model to the beach model, such asthe connection between phase transition and a certainpercolation event. The Potts model extends the Ising model tomore than two spin states, and we go on to study thecorresponding extension of the beach model. Usingrandom-cluster model methods we obtain some results on where inthe parameter space this model exhibits phase transition.Finally we study the beach model on regular trees. Criticalvalues are estimated w

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48

Squires, Adam Michael. "Bending energetics and phase transition kinetics in 21A/DLCP." Thesis, Imperial College London, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.252396.

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49

Bratko, Milan. "The magnetocaloric effect at a first order phase transition." Thesis, Imperial College London, 2013. http://hdl.handle.net/10044/1/23653.

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The magnetocaloric effect (MCE) can be defined as the isothermal entropy change (or adiabatic temperature change) of a material upon application/removal of an external magnetic field and is the key physics for a magnetic cooling device. A discontinuity of entropy at a first order phase transition (FOPT) allows for a large entropy change to be induced by a relatively small field. However, a hysteresis is necessarily associated with a FOPT. The effects of hysteresis, as measured in a sensitive microcalorimeter, are the focus of the thesis. The calorimetric setup used is unique in allowing a sepa

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50

Misat, Sylvain. "The vortex-related phase transition in YBCO thin films." Thesis, University of Nottingham, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.298077.

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