1000 resultados para Palma, José Ceferino
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Dissertação de mestrado em Ciências da Educação: área de Educação e Desenvolvimento
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Dissertação apresentada à Escola Superior de Comunicação Social como parte dos requisitos para obtenção de grau de mestre em Jornalismo.
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Antologia biográfica e de memórias, este livro reúne o testemunho de amigos, companheiros de luta académica, cúmplices do exilio genebrino, políticos, que recordam José Medeiros Ferreira pela sua intervenção cívica e empenhamento na causa pública.
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FEBS Letters 579 (2005) 4585–4590
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This paper presents solutions for fault detection and diagnosis of two-level, three phase voltage-source inverter (VSI) topologies with IGBT devices. The proposed solutions combine redundant standby VSI structures and contactors (or relays) to improve the fault-tolerant capabilities of power electronics in applications with safety requirements. The suitable combination of these elements gives the inverter the ability to maintain energy processing in the occurrence of several failure modes, including short-circuit in IGBT devices, thus extending its reliability and availability. A survey of previously developed fault-tolerant VSI structures and several aspects of failure modes, detection and isolation mechanisms within VSI is first discussed. Hardware solutions for the protection of power semiconductors with fault detection and diagnosis mechanisms are then proposed to provide conditions to isolate and replace damaged power devices (or branches) in real time. Experimental results from a prototype are included to validate the proposed solutions.
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This paper presents a new predictive digital control method applied to Matrix Converters (MC) operating as Unified Power Flow Controllers (UPFC). This control method, based on the inverse dynamics model equations of the MC operating as UPFC, just needs to compute the optimal control vector once in each control cycle, in contrast to direct dynamics predictive methods that needs 27 vector calculations. The theoretical principles of the inverse dynamics power flow predictive control of the MC based UPFC with input filter are established. The proposed inverse dynamics predictive power control method is tested using Matlab/Simulink Power Systems toolbox and the obtained results show that the designed power controllers guarantees decoupled active and reactive power control, zero error tracking, fast response times and an overall good dynamic and steady-state response.
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This paper presents the design and compares the performance of linear, decoupled and direct power controllers (DPC) for three-phase matrix converters operating as unified power flow controllers (UPFC). A simplified steady-state model of the matrix converter-based UPFC fitted with a modified Venturini high-frequency pulse width modulator is first used to design the linear controllers for the transmission line active (P) and reactive (Q) powers. In order to minimize the resulting cross coupling between P and Q power controllers, decoupled linear controllers (DLC) are synthesized using inverse dynamics linearization. DPC are then developed using sliding-mode control techniques, in order to guarantee both robustness and decoupled control. The designed P and Q power controllers are compared using simulations and experimental results. Linear controllers show acceptable steady-state behaviour but still exhibit coupling between P and Q powers in transient operation. DLC are free from cross coupling but are parameter sensitive. Results obtained by DPC show decoupled power control with zero error tracking and faster responses with no overshoot and no steady-state error. All the designed controllers were implemented using the same digital signal processing hardware.
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Congrès de l’Association de Sociologues de Langue Française, Comité de Recherche n° 21 « Transactions Sociales », Istambul
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Ethnologia - Antropologia dos processos identitários, Lisboa
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Cultura Moderna e Contemporânea, n.2
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Um surto de leptospirose humana por atividade recreacional ocorreu no município de São José dos Campos em novembro de 1987, envolvendo um grupo de pessoas que, ao participarem de uma festa de confraternização em um clube na periferia da cidade, banharam-se em uma piscina de água natural. Após a realização da investigação epidemiológica e laboratorial, observou-se alta prevalência do sorotipo pomona na análise sorológica (91%) e não se conseguiu isolar o agente etiológico nas amostras de água da piscina do clube. Os dados epidemiológicos e laboratoriais sugerem que a fonte de infecção tenha sido a água da piscina contaminada por dejetos de suínos e de outros animais domésticos dos locais adjacentes a água do córrego que alimentava a piscina do clube.
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In order to cater for an extended readership, crime fiction, like most popular genres, is based on the repetition of a formula allowing for the reader's immediate identification. This first domestication is followed, at the time of its translation, by a second process, which wipes out those characteristics of the source text that may come into conflict with the dominant values of the target culture. An analysis of the textual and paratextual strategies used in the English translation of José Carlos Somoza's La caverna de las ideas (2000) shows the efforts to make the novel more easily marketable in the English-speaking world through the elimination of most of the obstacles to easy readability.
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Recensão crítica
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Para reconhecer a distribuição dos planorbídeos na 8ª Região Administrativa do Estado de São Paulo, 286 lotes de caramujos procedentes dos 85 municípios que a constituem foram examinados e identificados no Laboratório de Malacologia da SUCEN. Biomphalaria straminea, que ocorre em quatro criadouros - um em Altair e três em S. José do Rio Preto, foi a única espécie identificada capaz de vir a comportar-se naturalmente como hospedeira intermediária de S.mansoni. Isto demonstra que são mínimas as probabilidades da esquistossomose vir a instalar-se na área estudada.