Split Operator
Mostrando 1-12 de 15 artigos, teses e dissertações.
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1. Multi-scale representation of plastic deformation in fiber-reinforced materials: application to reinforced concrete
Abstract Here we present a multi-scale model to carry out the computation of brittle composite materials reinforced with fibers, and we show its application to standard reinforced concrete. The computation is carried out within an operator-split framework on the macro-scale, which allows for different failure mechanisms to develop in separate phases, as both
Lat. Am. j. solids struct.. Publicado em: 12/08/2019
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2. Transporte eletrÃnico em semicondutores porosos baseado na equaÃÃo de Schrodinger dependente do tempo. / Electronic transport in porous semiconductors based in time dependent Schrodinger equation.
Neste trabalho, propomos um uma pesquisa teÃrica onde estudamos as propriedades de um pulso eletrÃnico em uma camada de silÃcio poroso, injetado sob uma certa voltagem externa V. Desta forma, podemos definir fundamentalmente a forma das curvas T X V e R X V, onde T Ã o coeficiente de transmissÃo e R Ã o coeficiente de reflexÃo do pacote de onda atrav�
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 16/02/2012
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3. DinÃmica de pacotes de onda em semicondutores e grafeno e de vÃrtices em supercondutores
Este trabalho se divide em duas partes. Na primeira, analisamos a evoluÃÃo temporal de pacotes de onda em sistemas de baixa dimensionalidade. Para isso, resolvemos a equaÃÃo de SchrÃdinger dependente do tempo a partir do mÃtodo split-operator, que à de fÃcil implementaÃÃo computacional e permite ser expandido para sistemas com mais dimensÃes. Calc
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 13/12/2010
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4. TÃcnica Split Operator em Coordenadas Generalizadas. / Split Operator Technique in Generalized Coordinates
A mecÃnica quÃntica desempenha um papel fundamental na descriÃÃo e entendimento dos fenÃmenos naturais. De fato, os fenÃmenos que ocorrem em uma escala muito pequena (atÃmica ou sub-atÃmica) nÃo podem ser corretamente explicados fora do contexto da mecÃnica quÃntica. AlÃm disso, existem muitos fenÃmenos em escala macroscÃpica que revelam o comp
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 06/08/2010
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5. Aplicação da técnica LOD em métodos no domínio do tempo e freqüência para modelagem de meios convencionais e metamateriais / Application of LOD technique in time and frequency domain methods for modelling conventional and metamaterial media
This work focuses on developing efficient numerical methods, both in time and frequency domains, for modeling wave propagation in structures that present conventional media and/or metamaterial media combinations, particularly the metamaterials where both permeability and permittivity are simultaneously negative. In some cases, the simulation of such structur
Publicado em: 2007
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6. Análise técnica e econômica de um sistema de colheita florestal / Technical and economic analysis of a forest harvest system
Hand logging systems were the first adopted, mostly, in the exploitation of native forests, with no concern with the rationalization and productivity of such activities. In Brazil, the first activities of forest harvesting were carried out along the coast, at that time of discovery, when the main traded species was brazilwood. Machine selection and developme
Publicado em: 2007
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7. Determinism and a supersymmetric classical model of quantum fields
A quantum field theory is described which is a supersymmetric classical model. Supersymmetry generators of the system are used to split its Liouville operator into two contributions, with positive and negative spectrum, respectively. The unstable negative part is eliminated by a positivity constraint on physical states, which is invariant under the classical
Brazilian Journal of Physics. Publicado em: 2005-06
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8. Transient chaos in an elasto-plastic beam with hardening
This contribution discusses the transient chaos on a pin-ended elasto-plastic beam with both kinematic and isotropic hardening. An iterative numerical procedure, based on the operator split technique, is developed. Numerical simulations show that transient chaos causes sensitivity on initial conditions, which imply that the system response may become unpredi
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2003-04
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9. Chaotic motion of an elasto-plastic beam
The non-linear dynamics of a pin-ended elasto-plastic beam is discussed in this contribution. Ideal plasticity is in focus. Free and forced responses are considered. An iterative numerical procedure, based on the operator split technique, is developed. This work shows that jump phenomenon and sensitivity to initial conditions imply that the system response m
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2003-03
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10. Chaos and Unpredictability in the Vibration of an Elasto-Plastic Beam
This contribution discusses the nonlinear dynamics of a pin-ended elasto-plastic beam with both kinematic and isotropic hardening. An iterative numerical procedure based on the operator split technique is developed in order to deal with the nonlinearities in the equations of motion. Free and forced responses for harmonic sinusoidal and square wave excitation
Journal of the Brazilian Society of Mechanical Sciences. Publicado em: 2001
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11. Simulação por elementos finitos da propagação escalar de feixes opticos
This thesis describes the computer modelling of a wide range of optical waveguides, for integrated optics applications. The modelling described here involves the numerical solution of suitable Maxwell wave equations, such as Helmholtz and Fresnel. Within this context, the Beam Propagation Method (BPM) ar marching methods, can be divided into two general kind
Publicado em: 1998
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12. Estudo dos estados eletrônicos em sistemas quase-unidimensionais. / Study of electronic states in quasi-one-dimensional systems.
We have studied the electronic properties of two different quasi-one-dimensional systems solving self-consistently the Schrödinger and Poisson equation. The method we use to calculate the electronic levels is based on the solution of the time-dependent Schrödinger equation using the split-operator technique. In the first system we have studied, we present
Publicado em: 1997