Soft Power
Mostrando 25-36 de 63 artigos, teses e dissertações.
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25. Design of self-checking fully differential circuits and boards
A design methodology for on-line testing analog linear fully differential (FD) circuits is presented in this work. The test strategy is based on concurrently monitoring via an analog checker the common mode (CM) at the inputs of all amplifiers. The totally self-checking (TSC) goal is achieved for linear FD implementations provided that the checker CM thresho
Publicado em: 2011
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26. A visão brasileira da futura ordem global
Este artigo visa desdobrar a concepção brasileira da futura ordem global localizada entre os polos extremos de um concerto de grandes potências e de uma ordem mundial multirregional. O autor demonstra como os formuladores de política externa brasileira contribuem para um tipo de ordem global que oferece espaço de manobra para a potência emergente. As o
Contexto Internacional. Publicado em: 2010-12
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27. Conversor CC/CA de alta freqüência baseado em inversores ressonantes com comutação seqüencial para excitação de uma tocha indutiva a plasma térmico
This work describes the study, the analysis, the project methodology and the constructive details of a high frequency DC/AC resonant series converter using sequential commutation techniques for the excitation of an inductive coupled thermal plasma torch. The aim of this thesis is to show the new modulation technique potentialities and to present a technologi
Publicado em: 2010
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28. ESTUDO DE TRAFEGABILIDADE APLICADO A VEÍCULOS DE RODA EM TRANSPORTE E TRAÇÃO / TRAFFICABILITY STUDY APPLIED TO WHEELED VEHICLES IN TRANSPORT AND TRACTION
The ability of vehicles to traverse soft soils is an important aspect of their performance. The geological, climate and topography diversity originated, in Rio Grande do Sul, extensive areas of hydromorphic clay soils, as example, Planssoils and Gleissoils. When saturated of water, these soft soils present low loads support, difficult agricultural machinery
Publicado em: 2010
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29. Abordagem da química das fragrâncias de almíscares por estudos teóricos e espectroscópicos
Both pentadecanolide and exaltolide compounds were widely used by the perfume industry for their soft and persistent odor of musks, with high fixative power. However, once they have animal origin (customarily found in anal glands of the musk deer), their usage is controlled by high costs and, also, by environmental activist groups and by all animal lovers. A
Publicado em: 2010
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30. SYNTHESIS METHODOLOGY FOR SIMPLIFIED ZVT TOPOLOGIES APPLIED TO BIDIRECTIONAL PWM POLES / METODOLOGIA DE SÍNTESE DE TOPOLOGIAS ZVT SIMPLIFICADAS APLICADAS A PÓLOS PWM BIDIRECIONAIS
Among the soft-switching techniques, the zero-voltage-transition (ZVT) technique has been accepted well by the industry due its attractive characteristics, such as simplicity, low losses in the auxiliary commutation circuit (ACC), operation with soft-switching for a wide load range, and closest operation to the PWM converter counterpart. In three-phase volta
Publicado em: 2009
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31. ANÁLISE, MODELAGEM E VALIDAÇÃO EXPERIMENTAL DE UMA METODOLOGIA PARA O PROJETO DO INDUTOR EM CONVERSORES BOOST PFC / ANALYSIS, MODELING AND EXPERIMENTAL VALIDATION OF A DESIGN METHODOLOGY FOR THE INDUCTOR IN PFC BOOST CONVERTERS
This work presents the development of a methodology for design of inductor in singlephase PFC boost converters operating in CCM mode in agreement with international standards IEC 61000-3-2 and CISPR 22. Such converters are used in front-end modules of information technology equipment. This methodology is based on the investigation of the relationship among m
Publicado em: 2009
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32. O turismo e a diplomacia : na Espanha e no Brasil
A globalização modificou o mundo, aproximando as nações. O turismo também foi influenciado pelo processo de globalização, transformando-se, evoluindo e tornando-se acessível a um maior número de pessoas. Com as mudanças ocorridas, principalmente nos meios de transporte e de comunicação, as notícias, as realidades e os problemas nacionais, cada v
Publicado em: 2009
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33. Usefulness of hybrid SPECT/CT for the 99mTc-HMPAO-labeled leukocyte scintigraphy in a case of cranial osteomyelitis
Cranial osteomyelitis is a potentially fatal lesion. White blood cell scanning (WBC) with 99mTc-hexamethylpropylene amine oxime (HMPAO) has proven highly sensitive and specific in the diagnosis and follow-up of patients with suspected osteomyelitis. In this report we show the usefulness of SPECT and transmission CT performed simultaneously using a hybrid ima
Brazilian Journal of Infectious Diseases. Publicado em: 2008-12
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34. INVERSORES ZCZVT COM ACOPLAMENTO MAGNÉTICO: SÍNTESE E ANÁLISE.
This Ph. D. Thesis presents a in deep study of the mechanism of resonant transition soft-switching techniques. By means of the principles that rules the PWM resonant transition converters, a novel tool for analysis and synthesis have been developed. This novel tool also permit to be verified some of the main factors that made possible to he ZVT technique to
Publicado em: 2008
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35. ANALYSIS AND IMPLEMENTATION OF AN INTEGRATED AUXILIARY COMMUTATION CIRCUIT APPLIED TO AN UNINTERRUPTIBLE POWER SUPPLY / ANÁLISE E IMPLEMENTAÇÃO DE UM CIRCUITO DE AUXÍLIO À COMUTAÇÃO INTEGRADO APLICADO A UMA FONTE ININTERRUPTA DE ENERGIA
Este trabalho propõe um circuito de auxílio à comutação, aplicado a uma fonte ininterrupta de energia de dupla conversão, operando com inversor PWM ponte completa modulado em três níveis de tensão. Para obtenção desse circuito, este trabalho utiliza o conceito de integração de circuitos de auxílio à comutação: O estudo do caso ZVT. O conceit
Publicado em: 2008
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36. O lazer e a recreação na Revista Brasileira de Educação Física e Desportos como dispositivos educacionais (1968-1984)
This paper identifies the prescripts of leisure and recreation during the military period. It departs from the assumption that the concepts of leisure and recreation translated the expectancy of building compliant and disciplined bodies in order to control the population, so that they would be aligned with the military government ideal, thus creating conditi
Publicado em: 2008