Maximum Loading Point
Mostrando 13-22 de 22 artigos, teses e dissertações.
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13. COMPARATIVE ANALYSIS BETWEEN THE MAXIMIZATION OF VOLTAGE STABILITY MARGIN AND LOSS REDUCTION IN DISTRIBUTION SYSTEMS / ANÁLISE COMPARATIVA ENTRE A MAXIMIZAÇÃO DA MARGEM DE POTÊNCIA E MINIMIZAÇÃO DAS PERDAS TÉCNICAS EM SISTEMAS DE DISTRIBUIÇÃO DE ENERGIA ELÉTRICA
The increase of the consumption of electric energy takes the distribution systems to operate next to its limits, which might cause situation of maximum active and reactive power flow in the branches, that is, problems of voltage stability. The change of the topology of the network allows to find a configuration where de voltage stability indexes are far from
Publicado em: 2007
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14. Point of colapse method applied to the analysis of critical contingencies in electrical power systems / Método do ponto de colapso aplicado na análise de contingências críticas em sistemas elétricos de potência
The constant complexity increase of the electrical power systems demands a continuous improvement of operation and control techniques. The current supervision and control centers are characterized by functions that process collected real-time information, in order to effectively control the systems and to keep them operating in accordance with a specified sc
Publicado em: 2007
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15. Coordenadas Polares Versus Coordenadas Retangulares no Cálculo do Ponto de Máximo Carregamento em Sistemas Elétricos de Potência / Polar Versus Rectangular Coordinates for Computing the Maximum Loading Point in Electrical Power Systems
O aumento contínuo da demanda aliado as restrições econômicas e ambientais para a expansão das capacidades de geração e transmissão tem propiciado a operação dos sistemas elétricos de potência cada vez mais próxima de seus limites operativos. Conseqüentemente, a estabilidade de tensão é hoje um dos temas mais importantes tanto para as concess
Publicado em: 2007
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16. Computation of voltage stability margins of power systems / Obtenção da margem minima de estabilidade de tensão de sistemas eletricos de potencia
This work presents a new and fast method for computing the minimum voltage stability margin of electric power systems. The computation of the voltage stability margin (VSM) is often required for the planning and operation of power systems. Usually, loads are increased along a predefined direction, which can be estimated based on historical data or load forec
Publicado em: 2007
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17. VOLTAGE STABILITY REINFORCEMENT ON ELETRIC POWER SYSTEMS / REFORÇO DAS CONDIÇÕES DE ESTABILIDADE DE TENSÃO NA OPERAÇÃO DO SISTEMA ELÉTRICO
As the electric power transmission networks became more interconnected, the thermal limits of lines and transformers restrict less the power transmission. Similarly, the use of static systems of reactive power compensation increases the power transmission capacity in systems whereas before they were limited by problems of angular stability. Actually, transmi
Publicado em: 2002
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18. 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
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19. Cytosolic abscisic acid activates guard cell anion channels without preceding Ca2+ signals
The phytohormone abscisic acid (ABA) reports on the water status of the plant and induces stomatal closure. Guard cell anion channels play a central role in this response, because they mediate anion efflux, and in turn, cause a depolarization-induced K+ release. We recorded early steps in ABA signaling, introducing multibarreled microelectrodes in guard cell
National Academy of Sciences.
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20. Effects of creatine phosphate and P(i) on Ca2+ movements and tension development in rat skinned skeletal muscle fibres.
1. Mechanically skinned fast-twitch (FT) and slow-twitch (ST) muscle fibres of the rat were used to investigate the effects of fatigue-like changes in creatine phosphate (CP) and inorganic phosphate (P(i)) concentration on Ca(2+)-activation properties of the myofilaments as well as Ca2+ movements into and out of the sarcoplasmic reticulum (SR). 2. Decreasing
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21. Absence of Effect of Rufloxacin on Theophylline Pharmacokinetics in Steady State†
Several quinolone antibacterial agents are known to inhibit the metabolism of theophylline, with the potential to cause adverse events due to raised theophylline concentrations during coadministration. A randomized crossover study was therefore conducted with 12 healthy male volunteers (ages, 23 to 34 years; body weight, 64 to 101 kg) to evaluate a possible
American Society for Microbiology.
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22. A study of intracellular calcium oscillations in sheep cardiac Purkinje fibres measured at the single cell level.
Previous work has shown that an elevation of intracellular calcium concentration [( Ca2+]i) produces spontaneous oscillations of [Ca2+]i. However the fact that the oscillations are unsynchronized between different cells has made it difficult to study them. We have therefore injected only one cell in a Purkinje fibre with aequorin in order to avoid these prob