Function Generator
Mostrando 13-24 de 57 artigos, teses e dissertações.
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13. The generator coordinate method in density-functional theory / O uso do método da coordenada geradora na teoria do funcional da densidade
Esta tese apresenta uma nova aproximação variacional baseada no Método da Coordenada Geradora e na Teoria do Funcional da Densidade. Nesta nova aproximação, a função de onda de muitos corpos é representada como uma superposição de determinantes de Slater Kohn-Sham não-ortogonais calculados a partir de Hamiltonianos diferentes que carregam uma coor
Publicado em: 2007
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14. Studies for the amperometric determination of total nitrophosphates in waters in flow injection analysis / Estudos para a determinação amperométrica de nitrofosforados totais em águas em sistema de análise por injeção em fluxo
An electrochemical determination methodology of Parathion was investigated based on the amperometric detection of multiple pulses in a flow injection analysis system (FIA). A propulsion system without pulsation and an electrochemical detector for flow analysis systems were built and investigated for this determination. Studies of the electrochemical behavior
Publicado em: 2007
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15. Modelagem e análise de desempenho dinâmico de complexos elétricos contendo centrais eólicas dotadas de geradores síncronos / Modeling and dynamic performance analysis of electric power systems containing wind installations equipped with synchronous generators
New generation resources, with low implantation and operation costs and that provoke the minimum possible impact to the environment, are undoubtedly focuses of attention to all the segments of the society. From this common sense, the alternative or renewable sources of energy, and particularly the wind, have certainly had a significant penetration in the com
Publicado em: 2007
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16. Estudos para a determinaÃÃo amperomÃtrica de nitrofosforados totais em Ãguas em sistema de anÃlise por injeÃÃo em fluxo / Studies for the amperometric determination of total nitrophosphates in waters in flow injection analysis
An electrochemical determination methodology of Parathion was investigated based on the amperometric detection of multiple pulses in a flow injection analysis system (FIA). A propulsion system without pulsation and an electrochemical detector for flow analysis systems were built and investigated for this determination. Studies of the electrochemical behavior
Publicado em: 2007
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17. Modelagem e anÃlise de desempenho dinÃmico de complexos elÃtricos contendo centrais eÃlicas dotadas de geradores sÃncronos / Modeling and dynamic performance analysis of electric power systems containing wind installations equipped with synchronous generators
New generation resources, with low implantation and operation costs and that provoke the minimum possible impact to the environment, are undoubtedly focuses of attention to all the segments of the society. From this common sense, the alternative or renewable sources of energy, and particularly the wind, have certainly had a significant penetration in the com
Publicado em: 2007
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18. Programmable ac power source used to analyse electronic equipment performance in the electrical power system quality concept / Fonte de tensÃo ca trifÃsica programÃvel adequada para testes de equipamentos eletrÃnicos no contexto da qualidade da energia elÃtrica
Fontes de tensÃo CA programÃveis que apresentam baixa taxa de distorÃÃo harmÃnica sÃo utilizadas para emular fontes de alimentaÃÃo nÃo ideais com o propÃsito de realizar testes de sensibilidade/suportabilidade em equipamentos eletrÃnicos. Neste sentido, este trabalho apresenta uma nova topologia de amplificador Classe D utilizado para compor o est
Publicado em: 2007
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19. FLUXO DE POTÊNCIA ÓTIMO COM RESTRIÇÕES DA CURVA DE CAPABILIDADE DO GERADOR SÍNCRONO / EXCELLENT FLOW OF POWER WITH RESTRICTIONS OF THE CURVE OF CAPABILIDADE OF THE SYNCHRONOUS GENERATOR
This work presents the equations of operation limits of the synchronous machine that constitute the so called capability curve. From these mathematical equations, deduced from each one of these limits, the graphic of the operation curve is computationally generated, defining the operation region of the synchronous machine so that their windings do not itself
Publicado em: 2006
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20. Solving the unit commitment problem of hydropower plants via Lagrangian Relaxation and Sequential Quadratic Programming
We consider the optimal scheduling of hydropower plants in a hydrothermal interconnected system. This problem, of outmost importance for large-scale power systems with a high proportion of hydraulic generation, requires a detailed description of the so-called hydro unit production function. In our model, we relate the amount of generated hydropower to nonlin
Computational & Applied Mathematics. Publicado em: 2005-12
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21. A ação educativa na perspectiva da teoria do agir comunicativo de Jurgen Habermas : uma abordagem reflexiva
The present work intends to examine the educational action in the perspective of the theory of acting talkative having as objective to identify the kind of action produced by the interaction teacher-student in the context of the teaching institution. The study is the result of a bibliographical research and the theoretical referencial is based on Jürgen Hab
Publicado em: 2005
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22. ANÁLISE DE UM SISTEMA DE PRODUÇÃO SIMULTÂNEA DE ELETRICIDADE, FRIO E CALOR / ANALYSIS OF A SYSTEM FOR THE SIMULTANEOUS PRODUCTION OF ELECTRICAL ENERGY, HEAT AND COLD
The simultaneous production of electric energy, heat and cooling capacity from the primary fuel burning on a heat engine (trigeneration) can emerge as a promising strategy, from the energy and project points of view, mostly, in food and chemistry industries. The present work describes the experimental study of a vapor compression system for chilled water pro
Publicado em: 2005
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23. Desenvolvimento de um protótipo de aquisitor portátil de sinal mioelétrico / Development of a prototype of data logger to myoelectric signal
Electromyography is the study of the muscular function by the acquisition of the electric sign that the muscles produce. Most of the equipments for reception of the sEMG is bench models, in other words, they have a size that disables that the patient can carry it during the period of acquisition of the sign and it is also necessary that a connected computer
Publicado em: 2005
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24. Theoretical studyng of cross coupling mechanism presented in palladium-catalized Ph-Ph bond formation reaction by PhB (Oh)2 (Ph=C6H5) / Estudo teorico do mecanismo de acoplamento-cruzado envolvido na reação de formação da ligação Ph-Ph catalisada por paladio via PhB (OH)2 (Ph=C6H5)
By the generator coordinate method, atomic basis set function adapted to ECP-SBKJ was developed for B, C, N, O, F, P, S, CI e Pd using the functional B3LYP. The quality of these basis set function was tested by the determination of the proton affinity (PA) in such molecular models ( H, F, Cl, HO, HS, BH2, NH2, PH2, CH3, CH2F,CH2Cl, B(OH)2O, CH3O, CH3S, CH2FC
Publicado em: 2005