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Dissertations / Theses on the topic 'Critical exponent'

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Published: 4 June 2021
Last updated: 25 July 2025

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1

Felli, Veronica. "Elliptic variational problems with critical exponent." Doctoral thesis, SISSA, 2003. http://hdl.handle.net/20.500.11767/4304.

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2

Mavuso, Melusi Manqoba. "Semilinear elliptic partial differential equations with the critical Sobolev exponent." Master's thesis, University of Cape Town, 2017. http://hdl.handle.net/11427/25441.

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We present how variational methods and results from linear and non-linear functional analysis are applied to solving certain types of semilinear elliptic partial differential equations (PDEs). The ultimate goal is to prove results on the existence and non-existence of solutions to the Semilinear Elliptic PDEs with the Critical Sobolev Exponent. To this end, we first recall some useful results from functional analysis, including the Sobolev spaces, which provide a natural setting for the idea of weak or generalised solutions. We then present linear PDE theory, including eigenvalues of the Diric
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3

Jäderlund, Thom. "A scaling approach to critical exponent calculations for the 2D Ising model." Thesis, KTH, Fysik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-274382.

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4

Yuan, Chaogui. "On non-homogeneous quasi-linear PDEs involving the p-Laplacian and the critical Sobolev exponent." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape15/PQDD_0007/NQ27272.pdf.

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5

Lehnert, Ralf [Verfasser], Martin [Akademischer Betreuer] Möller, and Pascal [Akademischer Betreuer] Hubert. "On the critical exponent of infinitely generated Veech groups / Ralf Lehnert. Gutachter: Martin Möller ; Pascal Hubert." Frankfurt am Main : Univ.-Bibliothek Frankfurt am Main, 2014. http://d-nb.info/1050769082/34.

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6

König, Tobias [Verfasser], and Rupert [Akademischer Betreuer] Frank. "Symmetry, uniqueness and blow-up in some elliptic variational problems with critical exponent / Tobias König ; Betreuer: Rupert Frank." München : Universitätsbibliothek der Ludwig-Maximilians-Universität, 2020. http://d-nb.info/1215499914/34.

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7

Liu, Weigang. "A General Study of the Complex Ginzburg-Landau Equation." Diss., Virginia Tech, 2019. http://hdl.handle.net/10919/90886.

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In this dissertation, I study a nonlinear partial differential equation, the complex Ginzburg-Landau (CGL) equation. I first employed the perturbative field-theoretic renormalization group method to investigate the critical dynamics near the continuous non-equilibrium transition limit in this equation with additive noise. Due to the fact that time translation invariance is broken following a critical quench from a random initial configuration, an independent ``initial-slip'' exponent emerges to describe the crossover temporal window between microscopic time scales and the asymptotic long-time
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8

Havret, Benjamin. "On the Lyapunov exponent of random transfer matrices and on pinning models with constraints." Thesis, Université de Paris (2019-....), 2019. http://www.theses.fr/2019UNIP7124.

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Cette thèse se divise en deux parties indépendantes. La première (Chapitres 1 et 2) est consacrée à l’analyse de l’exposant de Lyapunov d’un produit de matrices de transfert aléatoires. Cet exposant de Lyapunov apparait de multiples fois dans la littérature physique, notamment dans l’analyse du modèle d’Ising dans certains milieux aléatoires. Nous nous intéressons à une prédiction de la littérature physique concernant son comportement singulier et nous proposons une analyse mathématique de cette singularité. La seconde partie (Chapitres 3, 4 et 5) porte sur une variation du modèle de Poland-Sc
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9

Monteiro, João Frederico Haas Leandro. "Análise da transição de fase normal-supercondutora dos compósitos [{Y,Gd}Ba2Cu3O7-]1-y-[PrBa2Cu3O7-]y e {[YBa2Cu3O7-]0,95-[PrBa2Cu3O7-]0,05}1-x-{Ag}x." UNIVERSIDADE ESTADUAL DE PONTA GROSSA, 2015. http://tede2.uepg.br/jspui/handle/prefix/850.

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Made available in DSpace on 2017-07-21T19:25:49Z (GMT). No. of bitstreams: 1 joao frederico Monteiro.pdf: 4579056 bytes, checksum: fa083a32b5c935e6fb6513dea178d562 (MD5) Previous issue date: 2015-09-22<br>Fundação Araucária de Apoio ao Desenvolvimento Científico e Tecnológico do Paraná<br>In this work we analyzed the superconductor-normal transition of the composites [YBa2Cu3O7-]1-y-[PrBa2Cu3O7-]y with 0<y<0,1, {[YBa2Cu3O7-]0,95-[PrBa2Cu3O7-]0,05}1-x-{Ag}x with 0<x<0,2 and [GdBa2Cu3O7-]0,95-[PrBa2Cu3O7-]0,05. All samples were prepared for solid state reaction method. The X-ray analysis demo
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10

Abreu, Rafael dos Reis 1983. "Soluções ground state para algumas classes de problemas elípticos." [s.n.], 2013. http://repositorio.unicamp.br/jspui/handle/REPOSIP/305901.

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Orientador: Marcelo da Silva Montenegro<br>Tese (doutorado) - Universidade Estadual de Campinas, Instituto de Matemática Estatística e Computação Científica<br>Made available in DSpace on 2018-08-23T11:08:01Z (GMT). No. of bitstreams: 1 Abreu_RafaeldosReis_D.pdf: 1052192 bytes, checksum: 6fe840dfe507b4cc6c5ad9f908da486a (MD5) Previous issue date: 2013<br>Resumo: Neste trabalho, tratamos de resultados de existência de soluções ground state para algumas classes de problemas elípticos sobre espaços euclidianos ou sobre domínios exteriores. Nos casos em que consideramos um domínio exterior, con
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11

Araújo, Yane Lísley Ramos. "Existence results for some elliptic equations involving the fractional Laplacian operator and critical growth." Universidade Federal da Paraíba, 2015. http://tede.biblioteca.ufpb.br:8080/handle/tede/9252.

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Submitted by ANA KARLA PEREIRA RODRIGUES (anakarla_@hotmail.com) on 2017-08-14T16:13:37Z No. of bitstreams: 1 arquivototal.pdf: 1041120 bytes, checksum: 3357ded46458082b719eebe4f03879a9 (MD5)<br>Made available in DSpace on 2017-08-14T16:13:37Z (GMT). No. of bitstreams: 1 arquivototal.pdf: 1041120 bytes, checksum: 3357ded46458082b719eebe4f03879a9 (MD5) Previous issue date: 2015-12-18<br>In this work we prove some results of existence and multiplicity of solutions for equations of the type (􀀀 ) u + V (x)u = f(x; u) in RN; where 0 < < 1, N 2 , (􀀀 ) denotes the fractional Laplacian,
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12

Arashiro, Everaldo. "Monte Carlo dinâmico aplicado aos modelos de Ising e Baxter-Wu." Universidade de São Paulo, 2002. http://www.teses.usp.br/teses/disponiveis/59/59135/tde-05032002-121019/.

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Investigações da dinâmica crítica em modelos de magnetismo, para tempos curtos, têm aparecido com grande freqüência na literatura. Essa técnica foi descoberta por Li, Schülke e Zheng que, inspirados em trabalhos anteriores de Huse e Janssen et al., mostraram que generalizações de grandezas como a magnetização e o cumulante de Binder exibem comportamento universal já no início da simulação. O estudo da criticalidade em tempos curtos proporciona um caminho alternativo para a estimativa do expoente z, além de permitir o cálculo de um novo expoente dinâmico &#952;, associado ao comportamento anôma
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13

Hallberg, Per. "Gibbs Measures and Phase Transitions in Potts and Beach Models." Doctoral thesis, KTH, Mathematics, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3837.

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<p>The theory of Gibbs measures belongs to the borderlandbetween statistical mechanics and probability theory. In thiscontext, the physical phenomenon of phase transitioncorresponds to the mathematical concept of non-uniqueness for acertain type of probability measures.</p><p>The most studied model in statistical mechanics is thecelebrated Ising model. The Potts model is a natural extensionof the Ising model, and the beach model, which appears in adifferent mathematical context, is in certain respectsanalogous to the Ising model. The two main parts of this thesisdeal with the Potts model and t
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14

Glorieux, Olivier. "Exposant critique des groupes de surfaces agissant sur H2 x H2 et H3." Thesis, Paris 6, 2015. http://www.theses.fr/2015PA066127/document.

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Cette thèse concerne l'étude de l'exposant critique associé à un groupe de surface dans deux cas. Le premier fait l'étude de l'action diagonale par deux représentations de l'espace de Teichmüller sur le produit de plans hyperboliques. Le second correspond à l'action quasi-Fuchsienne sur l'espace hyperbolique de dimension 3. Elle contient un chapitre de préliminaires détaillées introduisant les différents outils mathématiques nécessaires à la compréhension générale des énoncés et des preuves. L'étude de l'exposant critique sur H2*H2 correspond aux chapitre 2 et 3. Dans le second on y fait l'étu
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15

Yang, Lei. "HAUSDORFF DIMENSION OF DIVERGENT GEODESICS ON PRODUCT OF HYPERBOLIC SPACES." The Ohio State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=osu1401466357.

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16

Araújo, Maycon Sullivan Santos. "Equações elípticas com não lineradidades críticas e perturbações de ordem inferior." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/55/55135/tde-10102016-163017/.

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Neste trabalho, tivemos como objetivo estudar a existência de soluções fracas não triviais para o problema elíptico com não linearidade crítica { - &Delta;u = &lambda;u + u2* - 1+ + g(x, u+) + f(x); em &Omega; u = 0; sobre &part; &Omega; , (P) onde &Omega; é um domínio limitado com fronteira suave em &#8477;N, com N &ge; 3, 2* = 2N / (N - 2) é o expoente crítico de Sobolev, u+ = max(u; 0), g &isin; C(&Omega;&#772; x &#8477;, &#8477;+), &lambda; > &lambda;1, &lambda; &notin; &sigma; (- &Delta;) e f &isin; Lr> (&Omega;), com r > N. Com o intuito de observar as mudanças que ocorrem do caso s
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17

Meinke, Alexander. "Applications of the Extremal Functional Bootstrap." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-26112018-120129/.

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The study of conformal symmetry is motivated through an example in statistical mechanics and then rigorously developed in quantum field theories in general spatial dimensions. In particular, primary fields are introduced as the fundamental objects of such theories and then studied in the formalism of radial quantization. The implications of conformal invariance on the functional form of correlation functions are studied in detail. Conformal blocks are defined and various approaches to their analytical and numerical calculation are presented with a special emphasis on the one-dimensional case.
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18

Ricardo, Cleiton de Lima. "Um problema elíptico com expoente crítico de Sobolev." Universidade Federal da Paraí­ba, 2014. http://tede.biblioteca.ufpb.br:8080/handle/tede/7451.

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Made available in DSpace on 2015-05-15T11:46:23Z (GMT). No. of bitstreams: 1 arquivototal.pdf: 590579 bytes, checksum: 4c4cd48135a64532856a71b6336c52f4 (MD5) Previous issue date: 2014-07-31<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES<br>In this work we studied existence of positive solutions for an elliptic problem with critical Sobolev exponent (-u = up + f(x; u) em u = 0 sobre @ that vanishes on the boundary of a bounded domain of Rn. The nonlinearity f(x; u) has subcritical growth. This is done by showing that the minimax level is below a constant that depend
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19

Souza, Diego Ferraz de. "Concentration-compactness principle and applications to nonlocal elliptic problems." Universidade Federal da Paraíba, 2016. http://tede.biblioteca.ufpb.br:8080/handle/tede/9308.

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Submitted by ANA KARLA PEREIRA RODRIGUES (anakarla_@hotmail.com) on 2017-08-23T16:14:54Z No. of bitstreams: 1 arquivototal.pdf: 1030469 bytes, checksum: fd75dc32951ccd2147ed562db94af22a (MD5)<br>Made available in DSpace on 2017-08-23T16:14:54Z (GMT). No. of bitstreams: 1 arquivototal.pdf: 1030469 bytes, checksum: fd75dc32951ccd2147ed562db94af22a (MD5) Previous issue date: 2016-12-13<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES<br>The main goal of this work is to analyze concentration-compactness principles for fractional Sobolev spaces based on the concentration co
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20

Le, Thi Thu Hien. "Exposants de Lyapunov et potentiel aléatoire." Thesis, Brest, 2015. http://www.theses.fr/2015BRES0025/document.

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Dans le cadre de cette thèse, nous nous intéressons à ”l’exposant de Lyapu-nov” pour deux modèles en milieu aléatoire : la marche aléatoire en potentiel aléatoire, le mouvement brownien en potentiel poissonnien.Dans la première partie de la thèse (chapitre II), on étudie une marche aléatoire dans un potentiel aléatoire donné par une famille de variables aléa¬toires i.i.d. non-négatives. La continuité des exposants de Lyapunov par rap¬port à la loi du potentiel est démontrée dans le cas transient, c’est-à-dire en dimension d ≥ 3 ou en dimension 2 pour un potentiel borné inférieurement. On pours
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21

Sandell, Simon. "New scaling approach to critical exponents of the λ transition". Thesis, KTH, Fysik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-235402.

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22

Prazeres, Disson Soares dos. "Multiplicidade de Soluções para Problemas Elípticos Semilineares Envolvendo o Expoente Crítico de Sobolev." Universidade Federal da Paraí­ba, 2010. http://tede.biblioteca.ufpb.br:8080/handle/tede/7464.

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Made available in DSpace on 2015-05-15T11:46:26Z (GMT). No. of bitstreams: 1 arquivototal.pdf: 549935 bytes, checksum: f7562c326b5af177cb80a71a184aa0c9 (MD5) Previous issue date: 2010-08-04<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>In this dissertation, we study the multiplicity of solutions for the following class of semilinear elliptic problems involving the critical Sobolev exponent, ---u = - juj2---2 u + f (x; u) ; x 2 e u = 0; x 2 @ ; where N - 3, - RN is a smooth and bounded domain, - is a positive real parameter and 2- = 2N= (N - 2) is the critical Sobolev exp
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23

Belohorec, Peter. "Renormalization group calculation of the universal critical exponents of a polymer molecule." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/nq24397.pdf.

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24

Dougall, Rhiannon. "Critical exponents, the spectrum of group extended transfer operators and Kazhdan distance." Thesis, University of Warwick, 2017. http://wrap.warwick.ac.uk/95546/.

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25

Demchyshyn, A., and P. Selyshchev. "Critical exponents in percolation model of track regions with different depth distribution." Thesis, Sumy State University, 2011. http://essuir.sumdu.edu.ua/handle/123456789/20810.

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As a result of irradiation with Xe with E = 250 MeV in InP at room temperature [1] defects, similar to the "chain of pearls”, which are placed along the trajectory of the ions at depths ranging from 35 to 100 nm and from 7 to 10 microns have been identified. Such defects called tracks, and they can occur at different depths and have different shapes. Tracks were examined like a chain of deal spherical regions; it was assumed that each incident ion creates one such chain. In this model, we assume that the track is formed randomly, but in that place of the ion path, where the energy value,
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26

Harvey-Fros, Christopher Simon Francis. "The local potential approximation of the renormalization group." Thesis, University of Southampton, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.285624.

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27

Almeida, Samuel Oliveira de. "Soluções para problemas elípticos envolvendo o expoente crítico de Sobolev." Universidade Federal de Juiz de Fora, 2013. https://repositorio.ufjf.br/jspui/handle/ufjf/1468.

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Submitted by Renata Lopes (renatasil82@gmail.com) on 2016-05-11T15:47:00Z No. of bitstreams: 1 samueloliveiradealmeida.pdf: 770018 bytes, checksum: 7270cb9d1478f3f95d8316be0a0c13aa (MD5)<br>Approved for entry into archive by Adriana Oliveira (adriana.oliveira@ufjf.edu.br) on 2016-06-27T18:35:32Z (GMT) No. of bitstreams: 1 samueloliveiradealmeida.pdf: 770018 bytes, checksum: 7270cb9d1478f3f95d8316be0a0c13aa (MD5)<br>Made available in DSpace on 2016-06-27T18:35:32Z (GMT). No. of bitstreams: 1 samueloliveiradealmeida.pdf: 770018 bytes, checksum: 7270cb9d1478f3f95d8316be0a0c13aa (MD5) Previ
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Bischof, Rainer. "Gaussian Critical Line in Anisotropic Mixed Quantum Spin Chains." Doctoral thesis, Universitätsbibliothek Leipzig, 2013. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-107225.

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By numerical methods, two models of anisotropic mixed quantum spin chains, consisting of spins of two different sizes, Sa = 1/2 and Sb = 1 as well as Sb = 3/2, are studied with respect to their critical properties at quantum phase transitions in a selected region of parameter space. The quantum spin chains are made up of basecells of four spins, according to the structure Sa − Sa − Sb − Sb. They are described by the XXZ Hamiltonian, that extends the quantum Heisenberg model by a variable anisotropic exchange interaction. As additional control parameter, an alternating exchange constant between
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29

Cunha, Patrícia Leal da. "Resultados de existência para as equações críticas de Klein-Gordon-Maxwell." Universidade Federal de São Carlos, 2011. https://repositorio.ufscar.br/handle/ufscar/5819.

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Made available in DSpace on 2016-06-02T20:27:38Z (GMT). No. of bitstreams: 1 3466.pdf: 565162 bytes, checksum: 770041f07c68eda588bd0c501dabe93d (MD5) Previous issue date: 2011-02-10<br>Financiadora de Estudos e Projetos<br>In this work we analyze the existence of radially symmetric solutions, positive solutions as well as the existence of ground state solutions for a class of Klein-Gordon-Maxwell equations when the nonlinearity exhibits critical behavior. For the positive and ground state solutions we prove existence results when a potential V is introduced. In order to obtain such results,
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30

Khanfar, Abeer. "Multiple Solutions on a Ball for a Generalized Lane Emden Equation." ScholarWorks@UNO, 2008. http://scholarworks.uno.edu/td/901.

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In this work we study the Generalized Lane-Emden equation and the interplay between the exponents involved and their consequences on the existence and non existence of radial solutions on a unit ball in n dimensions. We extend the analysis to the phase plane for a clear understanding of the behavior of solutions and the relationship between their existence and the growth of nonlinear terms, where we investigate the critical exponent p and a sub-critical exponent, which we refer to as ^p. We discover a structural change of solutions due the existence of this sub-critical exponent which we relat
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31

CARAFFA, BERNARD Daniela. "Equations aux dérivées partielles elliptiques du quatrième ordre avec exposants critiques de Sobolev sur les variétés riemanniennes avec et sans bord." Phd thesis, Université Pierre et Marie Curie - Paris VI, 2003. http://tel.archives-ouvertes.fr/tel-00003179.

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L'objet de cette thèse est l'étude, sur les variétés riemanniennes compactes $(V_n,g)$ de dimension $n>4$, de l'équation aux dérivées partielles elliptique de quatrième ordre $$(E)\; \Delta^2u+\nabla [a(x)\nabla u] +h(x)u= f(x)|u|^(N-2)u$$ où $a$, $h$, $f$ sont fonction $C^\infty $, avec $f(x)$ fonction constante ou partout positive et $N=(2n\over((n-4)))$ est l'exposant critique. En utilisant la méthode variationnelle on prouve dans le théorème principal que l'équation $(E)$ admet une solution $C^((5,\alpha))(V)$ $0<\alpha<1$ non nulle si une certaine condition qui dépend de la meilleure cons
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32

Rodrigues, Rodrigo da Silva. "Sistemas elípticos com pesos envolvendo o expoente crítico de Hardy-Sobolev." Universidade Federal de São Carlos, 2007. https://repositorio.ufscar.br/handle/ufscar/5806.

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Made available in DSpace on 2016-06-02T20:27:36Z (GMT). No. of bitstreams: 1 1610.pdf: 953018 bytes, checksum: 71de779ec49ee3cef03c3060c45a97f3 (MD5) Previous issue date: 2007-11-20<br>Financiadora de Estudos e Projetos<br>In this work, we will study the existence and nonexistence of positive weak solutions for two classes of elliptic systems with weights. The first class will involve nonlinearities of the type positone and semipositone. We will prove a strong maximum principle, and we will obtain some properties of the first eigenfunction of the eigenvalue problem associated to our operator
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33

Michel, Guillaume. "Parois et ondes de surface : dissipation, effet Doppler et interactions non linéaires." Thesis, Paris Sciences et Lettres (ComUE), 2017. http://www.theses.fr/2017PSLEE038/document.

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Dans cette thèse, nous étudions comment la présence de parois affecte les ondes de surface. La dissipation associée au mouillage, objet central des premiers chapitres, est abordée expérimentalement. Nous mesurons son évolution avec la taille du ménisque et montrons qu’en mouillage total des non-linéarités apparaissent dès que l’oscillation du ménisque atteint l’épaisseur des couches limites. Dans un deuxième temps, nous quantifions les échanges d’énergie ayant lieu lors de laréflexion d’une onde de surface sur une paroi oscillante, appelés effet Doppler généralisé. Après une mise en évidence e
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34

He, Daoyin [Verfasser], Ingo [Akademischer Betreuer] [Gutachter] Witt, Dorothea [Gutachter] Bahns, and Thomas [Gutachter] Schick. "Critical exponents for semilinear Tricomi-type equations / Daoyin He ; Gutachter: Ingo Witt, Dorothea Bahns, Thomas Schick ; Betreuer: Ingo Witt." Göttingen : Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2016. http://d-nb.info/1120117704/34.

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35

Hemmingsson, Nils. "On the dynamics of a family of critical circle endomorphisms." Thesis, KTH, Matematik (Avd.), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-259743.

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In this thesis we study two seperate yet related three parameter-families of continuously differentiable maps from the unit circle to unit circle which have a single critical point. For one of the families we show that there is a set of positive measure of parameters such that there is a set of positive measure for which all points in the latter set, the derivative experiences exponential growth. We do so by applying a similar methodology to what Michael Benedicks and Lennart Carleson used to study the quadratic family. For the other family we attempt to show a similar but weaker result using
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36

Ferraz, Carlos Handrey Araújo. "Dinâmica de redes Booleanas aleatórias na presença de agente danificador." reponame:Repositório Institucional da UFC, 2007. http://www.repositorio.ufc.br/handle/riufc/11913.

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FERRAZ, Carlos Handrey Araújo. Dinâmica de redes Booleanas aleatórias na presença de agente danificador. 2007. 99 f. Tese (Doutorado em Física) - Programa de Pós-Graduação em Física, Departamento de Física, Centro de Ciências, Universidade Federal do Ceará, Fortaleza, 2007.<br>Submitted by Edvander Pires (edvanderpires@gmail.com) on 2015-05-05T20:04:53Z No. of bitstreams: 1 2007_tese_chaferraz.pdf: 1298388 bytes, checksum: 78cd24083b62d39536e51a28bb85dd73 (MD5)<br>Approved for entry into archive by Edvander Pires(edvanderpires@gmail.com) on 2015-05-07T14:26:22Z (GMT) No. of bitstreams: 1 2007_
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37

Gutierrez, Emmanuel David Mercado. "Thermal expansion coefficient for a trapped Bose gas during phase transition." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/76/76132/tde-27102016-102903/.

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Ultra cold quantum gas is a convenient system to study fundamental questions of modern physics, such as phase transitions and critical phenomena. This master thesis is devoted to experimental investigation of the thermodynamics susceptibilities, such as the isothermal compressibility and the thermal expansion coefficient of a trapped Bose-Einstein condensate (BEC) of 87Rb atoms. The critical phenomena and the critical exponents across the transition can explain the behavior of the isothermal compressibility and the thermal expansion coefficient near the critical temperature TC. By employing th
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38

Lampen, Kelley Paula J. "Low Dimensionality Effects in Complex Magnetic Oxides." Scholar Commons, 2015. http://scholarcommons.usf.edu/etd/5874.

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Complex magnetic oxides represent a unique intersection of immense technological importance and fascinating physical phenomena originating from interwoven structural, electronic and magnetic degrees of freedom. The resulting energetically close competing orders can be controllably selected through external fields. Competing interactions and disorder represent an additional opportunity to systematically manipulate the properties of pure magnetic systems, leading to frustration, glassiness, and other novel phenomena while finite sample dimension plays a similar role in systems with long-range co
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39

Wada, Alexander Hideki Oniwa. "Simulações numéricas da percolação dinâmica." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-03072015-181542/.

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Estudamos o modelo epidemiológico denominado susceptível-exposto-infectado (SEI) na rede quadrada por meio de simulações numéricas. Nesse modelo, cada sítio da rede pode estar susceptível, exposto ou infectado. Um sítio susceptível nas vizinhanças de um infectado se torna infectado com uma certa probabilidade e exposto com probabilidade complementar. Sítios infectados ou expostos permanecem para sempre nessa condição. Mostramos que os aglomerados gerados a partir de um único infectado numa rede repleta de suscetíveis são os mesmos aglomerados presentes na percolação isotrópica. Calculamos os e
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40

Badard, Mathieu. "Optimisation et contrôle de la transition dynamique de percolation au sein de matériaux nonostructurés : expérience et modélisation." Thesis, Grenoble, 2014. http://www.theses.fr/2014GRENI093.

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L'émergence des nanotubes de carbone a ouvert de nouveaux champs d'application dans le domaine des matériaux polymères. L'ajout de ces charges carbonées au sein de polymères permet la mise en œuvre de composites aux propriétés électriques optimisées. La conductivité de ces matériaux dépend en grande partie de l'organisation des charges dans la matrice, notamment de la présence de réseaux percolants. L'objectif du présent travail de thèse est de comprendre les mécanismes de structuration des nanotubes de carbone au sein de différents milieux. L'architecture de ces réseaux de charges a principal
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41

Fernandes, Henrique Almeida. "Propriedades críticas estáticas e dinâmicas de modelos com simetria contínua e do modelo Z(5)." Universidade de São Paulo, 2006. http://www.teses.usp.br/teses/disponiveis/59/59135/tde-06062008-175542/.

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Neste trabalho, nós investigamos o comportamento crítico dinâmico de três modelos estatísticos utilizando simulações Monte Carlo em tempos curtos. Inicialmente, estudamos os modelos tridimensionais de dupla-troca e de Heisenberg. O expoente dinâmico de persistência global, bem como o expoente z são estimados através de duas técnicas. Para obter o expoente de persistência global, aplicamos diretamente a lei de potência obtida para a probabilidade de persistência global e em seguida fizemos o colapso de uma função universal para duas redes de tamanhos diferentes. Para estimar o valor de z, nós u
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42

Ferraz, Carlos Handrey AraÃjo. "DinÃmica de redes Booleanas aleatÃrias na presenÃa de agente danificador." Universidade Federal do CearÃ, 2007. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=557.

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NÃs realizamos simulaÃÃes de computador em autÃmatos de Kauffman em diversos grafos tais como redes quadradas regulares e agregados de percolaÃÃo invasiva afim de investigar transiÃÃes de fase, entropia total, distribuiÃÃo radial do dano total mÃdio (expoente dinÃmico $z$) e velocidade de propagaÃÃo do dano quando se introduz um agente danificador no sistema, apelidado o "homem estranho". A despeito do aumento na eficiÃncia de danificaÃÃo, nÃs nÃo observamos qualquer mudanÃa apreciÃvel no limiar de transiÃÃo para o caos tanto para o caso de rede quadrada como para o caso de mundo pequeno quand
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43

Rodrigues, Claudio Fernandes de Souza. "Criticalidade do modelo de oito vértices na vizinhança de modelos solúveis pelo método de cotas superior e inferior." Universidade de São Paulo, 2003. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-24022014-141333/.

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O objetivo deste trabalho é analisar o comportamento dos expoentes críticos do modelo de Oito Vértices através de cotas superior e inferior para sua função de partição na vizinhança de modelos solúveis. O método é ilustrado pelo modelo de Heisenberg quântico unidimensional também denominado modelo XYZh. Aplica-se igualmente ao modelo de Ising bidimensional (com interação quártica e segundos vizinhos). Assim, propomos um modo alternativo de abordar universalidade nos modelos de Heisenberg unidimensional quântico e Ising bidimensional clássico por desigualdades satisfeitas por suas funções de pa
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44

Fino, Ahmad. "Contributions aux problèmes d'évolution." Phd thesis, Université de La Rochelle, 2010. http://tel.archives-ouvertes.fr/tel-00437141.

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Dans cette thèse, nous nous intéressons à l'étude de trois équations aux dérivées partielles et d'évolution non-locales en espace et en temps. Les solutions de ces trois solutions peuvent exploser en temps fini. Dans une première partie de cette thèse, nous considérons l'équation de la chaleur nonlinéaire avec une puissance fractionnaire du laplacien, et obtenons notamment que, dans le cas d'exposant sur-critique, le comportement asymptotique de la solution lorsque $t\rightarrow+\infty$ est déterminé par le terme de diffusion anormale. D'autre part, dans le cas d'exposant sous-critique, l'effe
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45

Faulkner, Michael. "Phénomènes émergents et topologiques dans les systèmes BKT sur réseau." Thesis, Lyon, École normale supérieure, 2015. http://www.theses.fr/2015ENSL0984/document.

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Cette thèse s'intéresse aux phénomènes électrostatiques émergents dans les modèles magnétiques toroïdaux bi-dimensionnels à symétrie XY, fournissant ainsi un support pour de plus amples recherches dans le domaine de la transition de phase Berezinskii-Kosterlitz-Thouless (BKT).Dans de nombreux systèmes bi-dimensionnels, dont le modèle bi-dimensionnel XY du magnétisme, la transition BKT contrôle la dissociation thermique de paires de défauts topologiques liés. Le modèle XY est analogue au gaz de Coulomb bi-dimensionnel, à ceci près qu'il peut être simulé sans avoir à modéliser les interactions à
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46

Saleur, Hubert. "Phenomenes critiques bidimensionnels." Paris 6, 1987. http://www.theses.fr/1987PA066613.

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Etude theorique des divers aspects des phenomenes critiques bidimensionnels par des methodes essentiellement analytiques: transformation en modeles de champ libre, exploitation de la symetrie conforme. Determination des valeurs exactes d'exposants critiques, et des expressions des fonctions de partition et des fonctions de correlation. Test d'un certain nombre de resultats par des calculs de matrice de transfert ou des simulations de monte carlo
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47

Teixeira, Rivania Maria do Nascimento. "Leis de escala em mapeamentos discretos." reponame:Repositório Institucional da UFC, 2016. http://www.repositorio.ufc.br/handle/riufc/18470.

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TEIXEIRA, Rivania Maria do Nascimento. Leis de escala em mapeamentos discretos. 2016. 85 f. Tese (Doutorado em Física) - Programa de Pós-Graduação em Física, Departamento de Física, Centro de Ciências, Universidade Federal do Ceará, Fortaleza, 2016.<br>Submitted by Edvander Pires (edvanderpires@gmail.com) on 2016-07-18T18:20:56Z No. of bitstreams: 1 2016_tese_rmnteixeira.pdf: 5826571 bytes, checksum: 6cde4ae78436e469a71b8b9608331776 (MD5)<br>Approved for entry into archive by Edvander Pires (edvanderpires@gmail.com) on 2016-07-18T18:22:35Z (GMT) No. of bitstreams: 1 2016_tese_rmnteixeira.pdf:
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Smiseth, Jo. "Criticality and novel quantum liquid phases in Ginzburg--Landau theories with compact and non-compact gauge fields." Doctoral thesis, Norwegian University of Science and Technology, Faculty of Natural Sciences and Technology, 2005. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-583.

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<p>We have studied the critical properties of three-dimensional U(1)-symmetric lattice gauge theories. The models apply to various physical systems such as insulating phases of strongly correlated electron systems as well as superconducting and superfluid states of liquid metallic hydrogen under extreme pressures. This thesis contains an introductory part and a collection of research papers of which seven are published works and one is submitted for publication.</p><p>Paper I: Critical properties of the 2+1-dimensional compact abelian Higgs model with gauge charge q=2 are studied. We introduce
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49

Medvedyeva, Kateryna. "Characteristic properties of two-dimensional superconductors close to the phase transition in zero magnetic field." Doctoral thesis, Umeå : Univ, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-102.

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50

Kim, Kwangmoo. "Topics in the theory of inhomogeneous media composite superconductors and dielectrics /." Columbus, Ohio : Ohio State University, 2007. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1180537980.

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