Approximation Theory
Mostrando 25-36 de 199 artigos, teses e dissertações.
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25. Indústria cultural, repetição e totalização na trilogia Pânico / Culture industry, repetition and totalization in the Scream trilogy
Throughout last century, the culture industry s modus operandi was responsible for a standardizing movement in cultural artifacts, constituting a tensional axis between repetition and innovation that embraces all arts, but mainly in film, having the latter a greater need for returns in its production investments. That way, regarding the American cinema as th
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 27/09/2011
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26. Análise das variáveis de entrada de uma rede neural usando teste de correlação e análise de correlação canônica / Analysis of input variables of an artificial neural network using bivariate correlation and canonical correlation
The monitoring of variables and diagnosis of sensor fault in nuclear power plants or processes industries is very important because an early diagnosis allows the correction of the fault and, like this, do not cause the production interruption, improving operators security and its not provoking economics losses. The objective of this work is, in the whole of
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 21/09/2011
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27. Aspectos clássicos da cosmologia inflacionária.
The last decades have been of major developments in cosmology since the advent of cosmological inflation as a solution to the problems of standard cosmological model. As one of the main paradigms of modern cosmology, to study the classical theory of inflation is the main objective of this work. Before, we present the main evidences of universal expansion and
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 08/08/2011
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28. ArgumentaÃÃo/polifonia nas anÃforas encapsuladoras. / Argumentation/Polyphony within anaphoric encapsulation
The Thesis describes argumentation within encapsulated anaphors based on Semantic Blocks Theory (SBT) (CAREL, 1995; DUCROT &CAREL, 1998) and Polyphony (ANSCOMBRE e DUCROT, 1998; DUCROT e CAREL, 2008) approaches. The study assumes the hypothesis that SBT is an appropriate model to describe argumentative functions of encapsulated anaphors, since it approaches
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 20/05/2011
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29. Comportamento crítico da produção de entropia em modelos com dinâmicas estocásticas competitivas / Critical behavior of entropy production in models with competitive stochastic dynamics
We study kinetic phase transitions and the critical behavior of the entropy production in spin models with nearest neighbor interactions subject to two Glauber dynamics, which simulate two thermal baths at different temperatures. In this way, it is assumed that the system corresponds to a continuous time Markov process which obeys the master equation. Thus,
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 25/04/2011
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30. REMARKS ABOUT THE INVARIAN SUBSPACE PROBLEM / CONSIDERAÇÕES SOBRE O PROBLEMA DO SUBESPAÇO INVARIANTE
The Invariant Subspace Problem is the most important open question in Operator Theory. Although, there are many partial results, the question remains open for operators on complex, infinite-dimensional, separable Hilbert spaces. To prove that every operator has a non-trivial invariant subspace might be the beginning of a general structure theory for Hilbert
Publicado em: 2011
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31. Funções de interpolação e técnicas de solução para problemas de poisson usando método de elementos finitos de alta ordem / Interpolation functions and techniques for solving poisson problems using high order finite element method
Esse trabalho apresenta uma nova técnica de solução para o problema de Poisson, via problemas de projeção local, baseada na equivalência dos coeficientes para os problemas de Poisson e projeção. Um método de construção de matrizes de massa e rigidez, para triângulos, através do produto de matrizes unidimensionais de massa, mista e rigidez, usand
Publicado em: 2011
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32. Estimativas para entropia de operadores multiplicadores de séries de Walsh / Estimatives for entropy of multiplier operators of Walsh series
As funções de Walsh formam um conjunto ortonormal completo de L2 [0; 1) que pode ser aplicado em diferentes situações tais como transmissão de dados, filtração, enriquecimento de imagem, análise de sinais e reconhecimento de padrão. Inicialmente estudamos alguns resultados básicos da Teoria dos Martingais, tais como a convergência de martingais, a
Publicado em: 2011
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33. Hetero-nanotubos sob pressão hidrostática: um estudo ab initio / Hetero-nanotubes under hydrostatic pressure: an ab initio study
In this work the electronic and structural properties of the hetero-nanotube bundles, composed of a CNT (6,0) encapsulated in a BNNT (14,0) (CNT (6,0)@BNNT (14,0)) and a BNNT (6,0) encapsulated in a CNT (14,0) (BNNT(6,0)@CNT (14,0)), under hydrostatic pressure. For this, we applied density functional theory and generalized gradient approximation to the excha
Publicado em: 2011
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34. Final state interactions effects on kinetic energy sum spectra in nonmesonic weak decay
We analyze the effect of final state interactions (FSI) on coincidence spectra in nonmesonic hypernuclear weak decay, ΛN → nN, as a function of the kinetic energy sum, EnN = En+ E N, both for np and nn events. Adopting a formalism recently developed, the effects of FSI originated from the interaction between the outgoing nucleons and those in the residual
Brazilian Journal of Physics. Publicado em: 2010-09
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35. A structure-preserving iteration method of model updating based on matrix approximation theory
Some theories and a method are discussed on updating a generalized centrosymmetric model. It gives a generalized centrosymmetric modified solution with partial prescribed least square spectra constraints. The emphasis is given on exploiting structure-preserving algorithm based on matrix approximation theory. A perturbation theory for the modified solution is
Computational & Applied Mathematics. Publicado em: 2010-06
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36. An explicit formulation for the inverse transport problem using only external detectors: Part I: computational modelling
In the present work the inverse problem of identification of radiative properties, the total extinction and scattering coefficients, is analyzed and explicitly formulated based in an elementary semi-group theory. The Chandrasekhar discrete ordinates finite dimensional approximation of the angular variables is used for the direct problem representation with t
Computational & Applied Mathematics. Publicado em: 2010