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A study of the relation between spin glasses and optimization problemsEttelaie, R. January 1987 (has links)
No description available.
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Estimação em processos advindos da solução da equação de LangevinPinto, Douglas Rodrigues January 2010 (has links)
This paper presents the results of the estimations made in the process arising from the solution of classical Langevin equation with Brownian motion noise, and generalized, with α-stable noise. We perform the estimation of the parameter λ related to the memory function of such processes and the parameter α when the noise is a process with α-stable distribution. The estimation of λ is obtained from the maximum likelihood method, the ordinary least squares method and from the sample autocovariance function of the process. We discuss the types of noise that may be associated to the Langevin equation and present the Existence and Uniqueness theorem of Kannan and Kannan representation formula, which prove the existence and uniqueness of the solution for the generalized Langevin equation and presents criteria for the form of such solution.
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Pitchfork and Hopf bifurcation threshold in stochastic equations with delayed feedbackLepine, Francoise. January 1900 (has links)
Thesis (M.Sc.). / Written for the Dept. of Physics. Title from title page of PDF (viewed 2009/06/29). Includes bibliographical references.
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Estimação em processos advindos da solução da equação de LangevinPinto, Douglas Rodrigues January 2010 (has links)
This paper presents the results of the estimations made in the process arising from the solution of classical Langevin equation with Brownian motion noise, and generalized, with α-stable noise. We perform the estimation of the parameter λ related to the memory function of such processes and the parameter α when the noise is a process with α-stable distribution. The estimation of λ is obtained from the maximum likelihood method, the ordinary least squares method and from the sample autocovariance function of the process. We discuss the types of noise that may be associated to the Langevin equation and present the Existence and Uniqueness theorem of Kannan and Kannan representation formula, which prove the existence and uniqueness of the solution for the generalized Langevin equation and presents criteria for the form of such solution.
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Estimação em processos advindos da solução da equação de LangevinPinto, Douglas Rodrigues January 2010 (has links)
This paper presents the results of the estimations made in the process arising from the solution of classical Langevin equation with Brownian motion noise, and generalized, with α-stable noise. We perform the estimation of the parameter λ related to the memory function of such processes and the parameter α when the noise is a process with α-stable distribution. The estimation of λ is obtained from the maximum likelihood method, the ordinary least squares method and from the sample autocovariance function of the process. We discuss the types of noise that may be associated to the Langevin equation and present the Existence and Uniqueness theorem of Kannan and Kannan representation formula, which prove the existence and uniqueness of the solution for the generalized Langevin equation and presents criteria for the form of such solution.
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Propriedades magnéticas de fluidos magnéticos de dupla camada elétrica à base de ferrita de cobaltoEroni Paz dos Santos, Francisco January 2005 (has links)
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Previous issue date: 2005 / Universidade Federal do Piauí / Fluidos magnéticos vem se constituindo um tópico de grande destaque em termos de pesquisa teórica e experimental. Esses sistemas, compostos de nanopartículas mon¬odomínios dispersas em líquido carreador, apresentam propriedades magnéticas e líquidas que os tornam bastante versáteis, possibilitando o desenvolvimento de inúmeras aplicações. O conhecimento detalhado dessas propriedades é importante no desenvolvimento de aplicações tecnológicas, que vão desde a fabricação de impressoras que utilizam tintas magnéticas, selos e juntas para alto vácuo, até aplicações biológicas. Nesse sentido, estu¬damos as propriedades magnéticas de amostras de fluidos magnéticos de dupla camada elétrica, composto de nanopartículas de ferrita de cobalto, para diferentes diâmetros médios (4,5nm-ll,6nm). Medidas de difração de raios X foram realizadas para investigar a estrutura cristalina e fornecer o diâmetro médio das partículas que compõem os ferrofluidos. As medidas de magnetização estática foram realizadas através de um Magnetâmetro do tipo Foner. As curvas de magnetização em função do campo magnético, obtidas para as diferentes amostras, apresentaram um comportamento superparamagnético. Também, verificamos que a magnetização de saturação reduz à medida que diâmetro médio é reduzido, eviden¬ciando os efeitos de superfície. Trabalhamos com o modelo Langevin, juntamente com a distribuição log normal, para considerar a polidispersão, sobre as curvas de magnetização. Desta forma foi possível determinar os parâmetros de distribuição de diâmetros (dispersão e diâmetro médio) e momentos. Além disso. verificamos que a relação ele momento médio e diâmetro médio com ferritas ele Manganês e Cobre. Analisamos o comportamento ela magnetização ele saturação elas amostras de ferrofluidos à base ele Cobalto com valores típicos ele amostras à, base de Manganês e Cobre. E por fim verificamos que em nossas amostras apresentam interação dipolar totalmente desprezível a partir da análise de baixos campos
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La problématique de la communication dans trois romans d'André Langevin /Garneau, Véronique January 1990 (has links)
In Andre Langevin's five novels, the theme of isolation keeps on coming back. The characters however try by different means to establish a communication with other people but their attempts almost always fail, due to some sort of fatality. / This thesis sheds light on the different attempts by Langevin's characters to establish a relationship with those who surround them. The corpus is composed of Poussiere sur la ville (1953), Le temps des hommes (1956), L'Elan d'Amerique (1972), the latter belonging to the come back of the novelist after a silence of about twenty years. The dialogues and non verbal communications as they are established among the characters will successively be analyzed. The third novel, L'Elan d'Amerique, brings unique forms of this theme as it introduces a new style of the author, which has been compared to the "nouveau roman's". / From one novel to the other, the topic of incommunicability as developed by Langevin, takes new forms as the novelistic scope expands. But this research reveals that, in these three novels, a failure is always witnessed by the characters who never succeed in establishing satisfactory or lasting relationships with others.
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Langevin Equation approach to bridge different timescales of relaxion in protein dynamics /Caballero-Manrique, Esther, January 2006 (has links)
Thesis (Ph. D.)--University of Oregon, 2006. / Typescript. Includes vita and abstract. Includes bibliographical references (leaves 90-99). Also available for download via the World Wide Web; free to University of Oregon users.
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Le thème des passions dans les romans d’André Langevin.Plante-Charron, Cécile. January 1967 (has links)
Note:
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La problématique de la communication dans trois romans d'André Langevin /Garneau, Véronique January 1990 (has links)
No description available.
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