Discrete Representation
Mostrando 13-24 de 49 artigos, teses e dissertações.
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13. An explicit formulation for the inverse transport problem using only external detectors: Part I: computational modelling
In the present work the inverse problem of identification of radiative properties, the total extinction and scattering coefficients, is analyzed and explicitly formulated based in an elementary semi-group theory. The Chandrasekhar discrete ordinates finite dimensional approximation of the angular variables is used for the direct problem representation with t
Computational & Applied Mathematics. Publicado em: 2010
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14. A proposal for optimized analysis of transient currents in conductive materials. / Uma proposta para análise otimizada de correntes transitórias em materiais condutores.
In this work, a methodology is developed, based on the application of the moment method associated to a finite difference approximation, for time domain analysis of transient current distribution in conducting media. The computational procedure allows that long conductors with any cross section can be considered, approximated by filamentary elements. Thus, t
Publicado em: 2010
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15. Controle supervisÃrio da cadeia produtiva do biodiesel da mamona baseado em redes de Petri / Supervisory control of castor bean biodiesel suppy chain based on Petri nets
Nowadays many countries present critical problems related to energy demand-supply equilibrium. The reserves of petroleum-based products are unable to face future demand for the next decades. So, the search for alternative sources of energy has been strongly directed to biodiesel. Several fruit oils can be used as a source for biodiesel production and the cas
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 10/09/2009
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16. Hybrid motion planning approach for robot dexterous hands
This paper presents a manipulation planning approach for robot hands that enables the generation of finger trajectories. The planner is based on a hybrid approach that combines discrete-continuous kinematics using a fully discrete transition system. One of the main contributions of this work consists in the representation of the universe of different submode
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2009-12
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17. Synthesis of circuits with memory in multilevel logic / Síntese de circuitos com memória em lógica multinível
With the advanced in the technology VLSI (very Large Scale Integration) of the integrated circuits, broad interest has been generated regarding circuits that utilize more than two logical levels for the discrete representation of signals. These circuits are named, logic circuits of multiple values (MVL) and offer a great potential for the design of VLSI, bec
Publicado em: 2008
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18. A unified discrete-time approach to the state space representation of aeroelastic systems.
In complex flow situations, it is common to use numerical tools to evaluate the aerodynamic unsteady behavior. The present work presents an alternate formulation for the state space representation of aeroelastic systems based on digital control theory that is shown to be effective and accurate for the coupling of numerical solutions with such systems. The ap
Publicado em: 2007
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19. Optimization of pipeline scheduling operations: efficient formulations and hydraulic considerations. / Otimização da programação de operações dutoviárias: formulações eficientes e considerações hidraúlicas.
Pipeline systems correspond nowadays to the most efficient mode for the transportation of large amounts of liquid and vapor products for long distances. Pipelines are utilized by the Petroleum Industry to transport petroleum and its product derivatives. The present work addresses the scheduling of pipeline distribution of a system that operates with a pipeli
Publicado em: 2007
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20. Otimização da programação de curto prazo de duto bidirecional de derivados de petróleo. / Short-term scheduling optimization of derivative petroleum bidirectional pipeline.
Pipeline systems play a major role in the supply chain of the petroleum industry. These systems are responsible for the transportation of most of the crude oil and petroleum derivatives. Pipeline systems transfer large amounts of different petroleum types and their products at a lower cost than any other transportation mode. Pipelines interconnect oil fields
Publicado em: 2007
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21. Monte Carlo methods in nonlinear filtering theory.
This thesis is focused on two basic aspects of the Control Problem: the stochastic modelling of physical systems, and Monte Carlo-based numerical approximation of the nonlinear filtering problem solution. In the first topic this thesis concerns about clarifying some issues in the mathematical modeling of continuous-time systems with Brownian motion. The hypo
Publicado em: 2006
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22. A representação social da adolescencia e do adolescente e expectativas de pratica pedagogica de futuros professores
The present research had as objective to investigate the social representation that professors in initial formation has of the adolescence and of adolescent and the influence that in the expectations of practical pedagogical of the future professor. The data had been gotten through questionnaire and analyzed on the basis of the Analysis of Content. The resea
Publicado em: 2006
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23. Sistema gráfico interativo para ensino de análise estrutural através do método dos elementos finitos
This masters thesis refers to the expansion of INSANE (INteractive Structural ANalysis Environment): a computational system for finite element method (FEM) structural analysis discrete models, in Java language and object oriented programming (OOP). The work consists in an interactive graphic application to assist the FEM teaching for structural engineering.
Publicado em: 2006
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24. Optimization procedures for establishing reserve networks for biodiversity conservation taking into account population genetic structure
Conservation genetics has been focused on the ecological and evolutionary persistence of targets (species or other intraspecific units), especially when dealing with narrow-ranged species, and no generalized solution regarding the problem of where to concentrate conservation efforts for multiple genetic targets has yet been achieved. Broadly distributed and
Genetics and Molecular Biology. Publicado em: 2006