Physical Non Linearity
Mostrando 13-21 de 21 artigos, teses e dissertações.
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13. POLARIZAÇÃO ELETROTÉRMICA DE VIDROS E FIBRAS ÓPTICAS / GLASS AND OPTICAL FIBER ELECTROTHERMAL POLING
Over the past few years, there has been a growing demand for optical components for telecommunication systems. In order to increase the efficiency of these components, reduce costs and allow integration to current systems, efforts have been made in researching new materials, for example, silica. Due to its isotropic nature, silica, ordinarily, does not prese
Publicado em: 2005
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14. Análise não linear física de placas e cascas anisotrópicas laminadas acopladas ou não com meio contínuo tridimensional viscoelástico através da combinação entre o MEC e o MEF / Physical non-linear analysis of anisotropic laminated plates and shells coupled or not with three-dimensional viscoelastic medium by BEM/FEM coupling
This work presents an anisotropic laminated stiffened shell formulation, considering physical non-linearity with non-associative law, coupled to viscoelastic three-dimensional continuum medium. Plane triangular finite elements with cubic approximation for nodal variables are developed to model the shell. Bar elements with the same approximation are derived f
Publicado em: 2004
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15. "Validação e aplicação de novos métodos analíticos para análise de antidepressivos tricíclicos em amostras de plasma e formulações farmacêuticas" / Validation and aplication of new analitical methods for tricyclic antidepressants analysis in pharmaceutical formulations and plasma samples
Depressive disorders imply in a variety of physical, mental and emotional disturbances. Amitriptyline, imipramine, nortriptyline e desipramine are tricyclic antidepressants (TAD) largely used in depression treatment. The TADs are drugs that show high inter individual variability in pharmacokinetics, low clinical response or even they are not straightforwardl
Publicado em: 2004
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16. Critical behavior of a bounded Kardar-Parisi-Zhang equation
A host of spatially extended systems, both in physics and in other disciplines, are well described at a coarse-grained scale by a Langevin equation with multiplicative-noise. Such systems may exhibit nonequilibrium phase transitions, which can be classified into universality classes. Here we study in detail one such class that can be mapped into a Kardar-Par
Brazilian Journal of Physics. Publicado em: 2003-09
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17. BEM/FEM coupling application to the study of the elastoplastic dynamic interaction between soil and structures / Aplicação do acoplamento entre o MEC e o MEF para o estudo da interação dinâmica elastoplástica entre o solo e estruturas
O objetivo do presente trabalho é o desenvolvimento de um código computacional que possibilite a análise dinâmica de estruturas tridimensionais em regime elástico-linear acopladas ao solo, tratado como meio infinito elastoplástico. As superestruturas são tratadas por elementos finitos simples de casca e de barra geral, as estruturas de fundações sã
Publicado em: 2003
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18. Modelagem de pilares paredes em edifÃcios
Slender sky-scraper constructions require pondering prior analysis features like global and localized geometrical imperfection, physical and geometrical non-linearity aspects, adequate modeling of structural elements with respect to shear-wall elements, etc. In this work, the shear-wall behavior of an actual building is studied, upon which columns were model
Publicado em: 2002
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19. A influência da não-linearidade física do concreto armado na rigidez à flexão e na capacidade de rotação plástica. / The influence of physical non-linearity of the reinforced concrete on flexural rigidity and on plastic rotation capacity.
O presente trabalho é uma contribuição para o esclarecimento e a quantificação das influências na deformabilidade e na capacidade portante de elementos unidimensionais de concreto armado em solicitação plana, decorrentes da não-linearidade física dos materiais concreto e aço, bem como da fissuração e do enrijecimento da armadura tracionada, tamb
Publicado em: 2001
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20. Contribuição ao estudo de maquinas eletricas incluido o efeito da saturação magnetica
The effect of magnetic saturation is an important aspect to be taken into account when studying the behaviour of electrical machines. In the mathematical model developed throughout this work, the representation of that effect was based on the non-linearity of the magnetization curve, along with the physical parameters and the differential equations of the ma
Publicado em: 2000
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21. Proposta de simulação computacional para avaliação de sistemas de imagem radiológica pelo método das funções de transferência. / A computer simulation proposal for radiographic systems evaluation by the transfer functions method.
From the conventional evaluation by the radiological systems Transfer Functions, this work shows that it is necessary to obtain slit images at several field orientations so that this annalysis has a more real significance for non-isotropic systems. This is achieved from the non-linearity on the variations among the MTFs obtained in several directions between
Publicado em: 1992