Elliptical Models
Mostrando 1-12 de 15 artigos, teses e dissertações.
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1. Study About Buckling Phenomenon in Perforated Thin Steel Plates Employing Computational Modeling and Constructal Design Method
Abstract Perforated steel thin plates are commonly used in structural engineering. Due to their geometric characteristics, these panels can suffer the undesired buckling phenomenon. In this context, the present work associates the computational modeling and the constructal design method to evaluate the influence of the geometric configuration in the plate bu
Lat. Am. j. solids struct.. Publicado em: 2016-10
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2. Modelos multivariados binários com funções de ligação assimétricas / Multivariate binary regression models with asymmetric link functions
Conjuntos de dados com respostas multivariadas aparecem frequentemente em pesquisas em que os dados são provenientes de questionários. Exemplos mais comuns são pesquisas de opinião, mais especificamente, pesquisas de marketing em que a preferência do consumidor em potencial é avaliado: pelo produto, marca, preço, praça, promoção e etc. Um tipo pesq
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 25/05/2012
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3. Formação e evolução de galáxias: populações estelares na Via Láctea, galáxias elípticas e propriedades de galáxias em grupos / Galaxy Formation and Evolution: From the Milky Way to Galaxies in Groups
Understanding the way galaxies form and evolve throughout the cosmic time remains one of the greatest challenges of modern cosmology. Several processes are known to play a role in the formation of galaxies, such as feedback from supernovae and active galactic nuclei, chemical and dynamical evolution and environmental effects. This thesis encompasses these pr
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 13/03/2012
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4. Modelos elípticos multiníveis / Multilevel elliptical models
Os modelos multiníveis representam uma classe de modelos utilizada para ajustes de dados que apresentam estrutura de hierarquia. O presente trabalho propõe uma generalizacão dos modelos normais multiníveis, denominada modelos elípticos multiníveis. Esta proposta sugere o uso de distribuicões de probabilidade pertencentes à classe elíptica, envolvend
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 08/12/2011
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5. Modelos mistos aditivos semiparamétricos de contornos elípticos / Elliptical contoured semiparametric additive mixed models.
Neste trabalho estendemos os modelos mistos semiparamétricos propostos por Zhang et al. (1998) para uma classe mais geral de modelos, a qual denominamos modelos mistos aditivos semiparamétricos com erros de contornos elípticos. Com essa nova abordagem, flexibilizamos a curtose da distribuição dos erros possibilitando a escolha de distribuições com cau
Publicado em: 2009
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6. Análise bayesiana do modelo fatorial dinâmico para um vetor de séries temporais usando distribuições elípticas. / Bayesian Analysis of the dynamic factorial models for a time series vector using elliptical distribuitions.
The factor analysis is an important statistical tool that has wide practical applications and it explains the correlation among a large number of observable variables in terms of a small number of unobservable variables, known as latent variables. The proposal of this work is the Bayesian analysis, which incorporates the information we have concerning the pa
Publicado em: 2008
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7. Uma metodologia para avaliação do parafuso pilar em implantes dentários usando fotoelasticidade automatizada / A Metodology for Evaluation of a Pilar Screw of a Dental Implant Using The Automatizated Plane Photoelasticity Technique
The pillar screw is an important element of conventional dental implants. It is used to fix the pillar or intermediary to the implant set. In conventional dental implants, the torque level applied is near of 20 Ncm, however it knows that the pillar screw resists to bigger torque levels, and that a high pre-load could improve its setting. Many problems relate
Publicado em: 2007
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8. Transferências orbitais e dinâmicas na vizinhança dos pontos lagrangianos L1 e L2 / Transfer orbits and dynamics around the lagrangian points L1 e L2
In this work we present a study of the dynamics in the vicinity of the Lagrangian points L1 and L2 in the restricted three-body problem, considering the Sun-Earth and Earth-Moon models. Notwithstanding the hyperbolic character of these points, the reduction to the central manifold allows periodic and quasi-periodic orbits. This procedure is applied through t
Publicado em: 2005
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9. A CFD model for pollutant dispersion in rivers
Studies have shown that humankind will experience a water shortage in the coming decades. It is therefore paramount to develop new techniques and models with a view to minimizing the impact of pollution. It is important to predict the environmental impact of new emissions in rivers, especially during periods of drought. Computational fluid dynamics (CFD) has
Brazilian Journal of Chemical Engineering. Publicado em: 2004-12
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10. Investigações sobre as relações de escala dos sistemas estelares auto-gravitantes / Investigations on the scaling relations of self-gravitating stellar systems
We aim in this work to collect several numerical and analitical investigations concerning the origin of the scaling relations of the self-gravitating stellar systems. These relations depend on a very small number of independent physical parameters that reduce and confine the observational constraints to a plane in this parameter space, called the ""Fundament
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 200105
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11. Investigations on the scaling relations of self-gravitating stellar systems / Investigações sobre as relações de escala dos sistemas estelares auto-gravitantes
We aim in this work to collect several numerical and analitical investigations concerning the origin of the scaling relations of the self-gravitating stellar systems. These relations depend on a very small number of independent physical parameters that reduce and confine the observational constraints to a plane in this parameter space, called the ""Fundament
Publicado em: 2001
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12. Um modelo quase-analitico para simulação tridimensional de propagação de fratura hidraulica
Several models for the development of a fully three-dimensional hydraulic fracturing simulator have been described in the literature. However, most of them result in systems that require computational efforts not compatible with the direct application in the field. In order to attenuate this problem, simplified assumptions are introduced, resulting in pseudo
Publicado em: 1996