Inverse Problems
Mostrando 25-36 de 119 artigos, teses e dissertações.
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25. Solution of porous media inverse drying problems using a combination of stochastic and deterministic methods
In the present work the inverse problem of simultaneous heat and mass transfer modeled by Luikov equations is studied using a hybrid combination of the Levenberg-Marquardt (LM), Simulated Annealing (SA) and Artificial Neural Network (ANN) methods. The direct and inverse problems are described, formulated and solved. After the use of an experiment design tech
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2011-12
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26. Retrieval of kinetic rates in reactions with semi batch liquid phase using ill-posed inverse problem theory
A neural network procedure to solve inverse chemical kinetic problems is discussed in this work. Rate constants are calculated from the product concentration of an irreversible consecutive reaction: the hydrogenation of Citral molecule, a process with industrial interest. Simulated and experimental data are considered. Errors in the simulated data, up to 7%
Química Nova. Publicado em: 2011
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27. On asymptotic analysis of spectral problems in elasticity
The three-dimensional spectral elasticity problem is studied in an anisotropic and inhomogeneous solid with small defects, i.e., inclusions, voids, and microcracks. Asymptotics of eigenfrequencies and the corresponding elastic eigenmodes are constructed and justified. New technicalities of the asymptotic analysis are related to variable coefficients of diffe
Latin American Journal of Solids and Structures. Publicado em: 2011
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28. Disponibilidade de bebidas alcoólicas e beber e dirigir
Alcohol abuse and traffic crashes (TC) are considered public health problems and every year they are associated with 2.5 and 1.2 million of deaths worldwide, respectively. Alcohol outlet (AO) density has been associated with Driving Under Influence (DUI), which is a well known risk factor for TC. However, the association is controversial in international lit
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2011
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29. A comparative study of the application of differential evolution and simulated annealing in radiative transfer problems
The radiative transfer phenomenon is modeled by an integro-differential equation known as Boltzmann equation. This equation describes mathematically the interaction of the radiation with the participating medium, i.e., a medium that may absorb, scatter and emit radiation. In this sense, this work presents a study regarding the estimation of radiative propert
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2010-12
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30. Structural decomposition of the wave field in the solution of inverse seismic problems
Este artigo discute aspectos da aplicação prática da solução de problemas inversos sísmicos, baseados em modelos elásticos 1D de meio. A fim de melhor ajustar os modelos a observações reais, propomos utilizar uma decomposição estrutural, que permite transformar o campo de onda, correspondente a um modelo 3D, ao conjunto de dados, correspondentes a
Revista Brasileira de Geofísica. Publicado em: 2010-12
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31. Investigation of the adjoint method in aerodynamic optimization using various shape parameterization techniques
This paper studies the effect of design variables vector on automatic aerodynamic shape optimization in the adjoint method. Three shape techniques are studied: surface points, relations of the NACA 4-digit airfoil series and Hicks-Henne "Bump" Functions. First, this paper presents the complete formulation of the optimal design problem for the Euler equations
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2010-06
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32. Eigenvalue based inverse model of beam for structural modification and diagnostics: theoretical formulation
In the work, the problems of the beam structural modification through coupling the additional mass or elastic support, as well as the problem of diagnostics of the beam cracks, are discussed. The common feature for both problems is that the material parameters in each of the discussed cases change only in one point (additional mass, the support in one point,
Latin American Journal of Solids and Structures. Publicado em: 2010
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33. Application of neuro-fuzzy systems for the solution of radiative transfer inverse problems / Aplicação de redes neuro-fuzzy para a solução de problemas inversos em transferência radiativa
In this thesis is proposed an implementation for solving the inverse problem with the estimates of radiative properties (the single scattering albedo, the optical thickness of the media and the diffuse reflectivities) by the values of the intensities of radiation that leaves the participant medium using a hybrid approach of neuro-fuzzy systems, which combine
Publicado em: 2010
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34. Controlabilidade exata na fronteira e fórmula de reconstrução para equação viscoelástica
Neste trabalho obtivemos a controlabilidade exata na fronteira para equação viscoelástica por meio do Método da Unicidade de Hilbert. Para isto estudamos a existência, unicidade e regularidade de soluções forte, fraca e ultra fraca. A partir dos resultados de controlabilidade foi estabelecida a fórmula de reconstrução para a força externa.
Publicado em: 2010
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35. Application of artificial neural networks commitee machine in the solution of an inverse radiative transfer problem / Aplicação de máquinas de comitê de redes neurais artificiais na solução de um problema inverso em transferência radiativa
This work is based on the concept of neural networks committee machine and has the objective to solve the inverse radiative transfer problem in one-dimensional, homogeneous, absorbing and isotropic scattering media. The artificial neural networks committee machine adds and combines the knowledge acquired by an exact number of specialists which are represente
Publicado em: 2010
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36. A multiplicação na Escola Fundamental I: análise de uma proposta de ensino / Multiplication at Elementary School: a teaching proposal analysis
The present work consists of a qualitative research in education and the mathematics learning that objective was to propose a methodology based on Piaget´s constructivism, to teach multiplication in the early years of Eleentary School. The observation that shows how this content has been treated, in many schools, as a memorization and application matter, ra
Publicado em: 2010