Non Linear Interpolation
Mostrando 1-12 de 12 artigos, teses e dissertações.
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1. Comparison of an impec and a semi-implicit formulation for compositional reservoir simulation
In compositional reservoir simulation, a set of non-linear partial differential equations must be solved. In this work, two numerical formulations are compared. The first formulation is based on an implicit pressure and explicit composition (IMPEC) procedure, and the second formulation uses an implicit pressure and implicit saturation (IMPSAT). The main goal
Braz. J. Chem. Eng.. Publicado em: 2014-12
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2. High-order finite volume method for solving viscoelastic fluid flows
Computational Fluid Dynamics (CFD) is widely used by polymer processing industries in order to evaluate polymeric fluid flows. A successful computational code must provide reliable predictions (modeling) in a fast and efficient way (simulation). In this work, a new approach to solve the governing equations of viscoelastic fluid flows is proposed. It is based
Publicado em: 2011
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3. Teste e comparação de modelos matemáticos para o traçado de curvas granulométricas.
RESUMO: O conhecimento sobre a distribuição granulométrica de partículas sólidas é essencial para as áreas de material de construção, mecânica dos solos, física dos solos, hidrossedimentologia, entre outras. Em geral, as técnicas utilizadas para a avaliação da distribuição granulométrica de amostras resultam em valores pontuais, dependendo d
Planaltina. Publicado em: 2011
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4. Regionalização de vazões médias de longo período e de volumes de reservatórios de regularização
In this work, hydrological regionalization was utilized for estimating long-period average flow and reservoirs volumes in watersheds. For the regionalization of longperiod average flows, were analyzed three methods: Eletrobrás (1985a), linear interpolation, and Chaves et al. (2002). The acquisition of physical and climatic information, for regionalization,
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 24/08/2010
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5. Derivative-free uncostrained optimization based on polynomial interpolation / Otimização irrestrita sem derivadas baseada em interpolação polinomial
Neste trabalho, tratamos de problemas de minimização irrestrita. Estudamos as condições de otimalidade para este tipo de problema, bem como os métodos clássicos para sua resolução, tais como: o método do Gradiente, de Newton e os Quase-Newton. Abordamos também procedimentos de busca linear e de região de con_ança, conhecidos como estratégias de
Publicado em: 2008
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6. MODELOS DE DIMENSÃO REDUZIDA PARA ANÁLISE DAS OSCILAÇÕES NÃO-LINEARES E ESTABILIDADE DE CASCAS CILÍNDRICAS / LOW DIMENSIONAL MODELS FOR NONLINEAR VIBRATION ANALYSIS AND STABILITY OF CYLINDRICAL SHELLS.
The nonlinear vibrations and stability of a fluid-filled cylindrical shell is investigated using reduced order models. First, the nonlinear equations of motion of the cylindrical shell are deduced based on the expressions for the potential and kinetic energy, which are obtained using Donnell shallow shell theory. The internal fluid is considered to be irrota
Publicado em: 2008
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7. Estudo da convergência no método de elementos finitos aplicado a dispositivos eletromagnéticos não lineares. / Survey on the convergence of non-linear finite element method applied to electromagnetic devices in two-dimension.
This work presents a study on the convergence of non-linear finite analysis applied to the modeling of electromagnetic devices with plane symmetry. Three aspects have been thoroughly investigated which have influence on the convergence performance, namely: the relaxation factor in the Newton-Raphson algorithm, the model of the magnetization curve and the cho
Publicado em: 2007
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8. "Fusão de imagens médicas para aplicação em sistemas de planejamento de tratamentos em radioterapia" / MEDICAL IMAGES FUSION FOR APPLICATION IN TREATMENT PLANNING SYSTEMS IN RADIOTHERAPY
Software for medical images fusion was developed for utilization in CAT3D radiotherapy and MNPS radiosurgery treatment planning systems. A mutual information maximization methodology was used to make the image registration of different modalities by measure of the statistical dependence between the voxels pairs. The alignment by references points makes an in
Publicado em: 2006
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9. Substitution-Newton-Raphson method applied to the modeling of a vapour compression refrigeration system using different representations of the thermodynamic properties of R-134a
This paper gives a detailed presentation of the Substitution-Newton-Raphson method, suitable for large sparse non-linear systems. It combines the Successive Substitution method and the Newton-Raphson method in such way as to take the best advantages of both, keeping the convergence features of the Newton-Raphson with the low requirements of memory and time o
Journal of the Brazilian Society of Mechanical Sciences. Publicado em: 2002-07
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10. ESTIMACIÓN DEL CONSUMO PERSONAL PARA LAS CUENTAS NACIONALES DE BRASIL: UNA METODOLOGÍA PROPUESTA / ESTIMATION OF THE FAMILY CONSUMPTION FOR NATIONAL ACCOUNTS - THE PROPOSITION OF A METHODOLOGY / ESTIMAÇÃO DO CONSUMO PESSOAL PARA AS CONTAS NACIONAIS DO BRASIL: PROPOSIÇÃO DE UMA METODOLOGIA
El objetivo de este trabajo es establecer una metodologia para la estimación del agregado del Consumo familiar para las Cuentas Nacionales del Brasil. Para ello, se define una modificación sobre el Estimador de Regresión de Nadaraya- Watson (NWRE), que tiene como objetivo el uso de una red neural tipo RBF sobre datos provenientes de dos investigaciones do
Publicado em: 2001
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11. OTIMIZAÇÃO DE FORMA DE MODELOS BIDIMENSIONAIS DE ELEMENTOS FINITOS COM COMPORTAMENTO ELASTO-PLÁSTICO / OPTIMIZACIÓN DE FORMA DE MODELOS BIDIMENSIONALES DE ELEMENTOS FINITOS CON COMPORTAMIENTO ELÁSTICO-PLÁSTICO / SHAPE OPTIMIZATION OF 2D FINITE ELEMENT MODELS CONSIDERING ELASTO-PLASTIC BEHAVIOUR
The main goal of this work is to present an integrated system for the optimization of plane structures with elastoplastic behavior. The methodology proposes an alternative for the conservative way in which structures traditionally have been optimized, i.e., that they present linear elastic behavior. The computational system is said to be integrated because i
Publicado em: 2000
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12. Cardiovascular function at rest and on exercise in patients with cryptogenic fibrosing alveolitis.
Cardiovascular complications are common in fibrosing alveolitis, but there have been few physiological studies of the pulmonary circulation in this condition, and those that have been carried out have usually depended on right heart catheterisation. This paper reports non-invasive measurements of effective pulmonary blood flow, oxygen uptake, pulmonary arter