Continuation Method
Mostrando 13-24 de 45 artigos, teses e dissertações.
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13. Estudo de soluções do fluxo de potência em coordenadas cartesianas
This work presents the modelling and some methodologies to solve the steady state power network equations in rectangular coordinates, including the determination of the critical loadability. Firstly, four methods are presented, from the conventional application of the Newton-Raphson method to some approaches proposed more recently in the literature. Addition
Publicado em: 2008
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14. Análise de Defeitos em Coordenadas de Fase Utilizando Modelagem a Quatro Condutores e Fluxo de Potência Continuado / Fault Analysis by Phase Coordinates Using Four-Wire Modeling and Continuation Power Flow / Análise de Defeitos em Coordenadas de Fase Utilizando Modelagem a Quatro Condutores e Fluxo de Potência Continuado / Fault Analysis by Phase Coordinates Using Four-Wire Modeling and Continuation Power Flow
The effects of neutral wires and system grounding in most power flow and fault analysis methodologies are neglected or merged into phases using Krons reduction method. Thus, the neutral wire and ground currents and voltages remain unknown, restricting the analysis. This work presents a new formulation for fault analysis in the phase domain using three-phase,
Publicado em: 2008
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15. Estado fundamental do modelo de Hubbard estendido na cadeia AB2
In this dissertation we study the extended Hubbard model in the AB2 chain. The model hamiltonian contains a kinetic term, parameterized by t, and two terms of coulomb repulsion,U (intra-site) and V (inter-site). Considering a peculiar local exchange symmetry of the chain, as well as global symmetries of the Hubbard hamiltonian, we have applied the numerical
Publicado em: 2008
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16. Orbitas periodicas em sistemas mecanicos / Periodic orbits in dynamical systems
In this work we study dynamical systems possessing Hamiltonian and time-reversible structures. The reversibility concept is de¯ned in terms of an involution. Initially we discuss the dynamics of Hamiltonian vector ¯elds with 2 and 3 degrees of freedom around an elliptic equilibrium in the presence of an involution which preserves the symplectic structure.
Publicado em: 2008
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17. RemoÃÃo de tiofeno utilizando adsorventes preparados por mistura fÃsica
The need for cleaner fuels has increased that the studies aimed at reducing levels of sulfur in gasoline. The presence of sulfur compounds in fractions of oil is highly undesirable because it results in corrosion and environmental pollution. The hydrodesulfurization is the main process responsible for removing sulfur from most of the fuel industry of oil ref
Publicado em: 2008
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18. Vertical integration and financeirization: the case of the agro-industrial sector in Brazil. / Integração vertical e financeirização: o caso da agroindústria processadora de grãos no Brasil.
This work searched to know the justifications for use of the vertical integration in the agro-industrial sector in presence of recent and contrary movements of deverticalisation about this strategy. The main motivation of the study was the search for the understanding of the relationship between the vertical integration strategy and the called phenomenon fin
Publicado em: 2007
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19. Reproductive Biology, Population Dynamics and Risk of Extinction of Aegla strinatii Türkay, 1972 (Crustacea, Decapoda, Aeglidae) / Biologia reprodutiva, estrutura e dinâmica populacional e avaliação do grau de risco de extinção de Aegla strinatii Türkay, 1972 (Crustacea, Decapoda, Aeglidae)
This study aims to contribute for preservation of the only known population of Aegla strinatii and to reinforce the necessity to preserve the areas where this species occur. Therefore, monthly collections were realized during a two year period at Jacupiranga State Park which is considered to be the second largest conservation unit of São Paulo State. The sp
Publicado em: 2007
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20. Aplicação dos Métodos de Elementos de Contorno e Reciprocidade Dual em problemas de Plasticidade 2D Orientada a Objeto
This thesis is a continuation of previous studies in inelasticity in which the analysis of viscoelastic problems is done using the Boundary Element Method (BEM) with the Dual Reciprocity Method (DRM). Here, BEM is applied to the analysis of plane plasticity problems considering perfectly plastic materials and, taking advantage of the modular nature of the co
Publicado em: 2006
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21. O Papel da Língua Inglesa no Contexto de Globalização da Economia e as Implicações do Uso das NTICs no Processo de Ensino Aprendizagem desse Idioma
This study presents an analysis of the role that the English Language plays nowadays, and this is done by taking into account the implications of the uses of New Information and Communication Technology (ICT) in the teaching-learning process, as well as the changes that have been occurring in the work and education worlds, as a result of the process of globa
Publicado em: 2005
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22. A study about maximum loading in electrical power systems. / Estudo de máximo carregamento em sistemas de energia elétrica.
Este trabalho apresenta um estudo sobre o método da continuação aplicado ao problema de fluxo de potência. Definições e conceitos de estabilidade de tensão são descritos de forma a explicitar as diferenças e semelhanças existentes com relação ao estudo de máximo carregamento em sistemas de energia elétrica. Uma síntese da teoria da bifurcaçã
Publicado em: 2003
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23. Teste de banco com carga continua para analise do volume de oxigenio (VO2) predito e analisado por tempo de esforço em pessoas treinadas (TRD), ativas (ATV) e destreinadas (DTR) a partir dos 13 anos : proposta de validação
The objective of this study was to determine V02máx (ml/kg/min.), for indirect method and to classify the degree of aptitude aerobic in the ascent test and descent of the step test with continuous load, startingfrom the values found in the ventilation tube analyzed directly in Aerosport Teem 100. Methodology: the research of traverse character, no-probabili
Publicado em: 2001
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24. Obtenção do ponto de maximo carregamento em sistemas eletricos de potencia utilizando novas tecnicas de parametrização para o metodo de continuação
This work presents the features of new methods obtained with small modifications of the conventional Newton and fast decoupled methods. With the proposed modifications the problems caused by ill conditioning of the conventional methods for the determination of the maximum loading point and voltage stability margin ca1culation are avoided. New parameterizatio
Publicado em: 2000