Electric Section
Mostrando 25-34 de 34 artigos, teses e dissertações.
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25. Sedimentação mista carbonato-siliciclástico durante o albo-aptiano na porção emersa da bacia Sergipe-Alagoas
The Albian-Aptian mixed sediments, composed of carbonate and siliciclastic constituents, occur in the onshore portion of the Sergipe-Alagoas Basin, next to its current border. Outcrops are located 50 km to northwest from Aracaju and, for the greater part, in oil well areas. The interpretations now presented are based on outcrop description, georadar sections
Publicado em: 2006
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26. Caracterização de estruturas planares com substratos Iso/Anisotrópicos truncados através da técnica da ressonância transversa modificada
This work presents a theoretical and numerical analysis using the transverse resonance technique (TRT) and a proposed MTRT applied in the analysis of the dispersive characteristics of microstrip lines built on truncated isotropic and anisotropic dielectric substrates. The TRT uses the transmission lines model in the transversal section of the structure, allo
Publicado em: 2005
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27. Potencials and electric fields inside and outside resistive conductors carrying steady currents / Potenciais e campos eletricos dentro e fora de condutores resistivos com correntes constantes
In Chapter 1 we present an introduction about the electric field inside and outside resistive conductors carrying steady currents. We also discuss the distribution of surface charges that maintains the current fiow and its relation with these electric fields. We present some experiments related with these electric fields outside conductors with steady curren
Publicado em: 2005
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28. Indices padrão para análise das demonstrações contábeis de empresas do setor elétrico
O presente trabalho objetiva apresentar a construção de medidas estatísticas setoriais para o setor elétrico brasileiro, ou índices-padrão, como são também conhecidos. Trata-se de referencial constituído a partir de um conjunto de empresas representativas de um determinado setor e destina-se a avaliar determinada empresa comparando seus índices, ob
Publicado em: 2005
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29. Uma nova implementação do efeito skin no modelo da linha de transmissão / A new implementation of skin-effect in trnamission line model
This thesis presents the development of a new and quite simple implementa-tion of skin-effect in electrical and signal transmission line model for skin-effect 1088 analysis and study in frequency-domain. Skin-effect 1088 is taken into account by formulating and solving Maxwell s wave equation as a function of the electrical field in the direction of propagat
Publicado em: 2005
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30. Production of a cloned calf from a fetal fibroblast cell line
The present study examined the in vitro and in vivo development of bovine nuclear-transferred embryos. A bovine fetal fibroblast culture was established and used as nucleus donor. Slaughterhouse oocytes were matured in vitro for 18 h before enucleation. Enucleated oocytes were fused with fetal fibroblasts with an electric stimulus and treated with cytochalas
Brazilian Journal of Medical and Biological Research. Publicado em: 2003-11
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31. Efeito do tempo pos-prensagem na adaptação das bases de proteses totais confeccionadas com resina acrilica QC-20 em diferentes ciclos de polimerização
This study evaluated the influence of the post-compressing rest time (immediate, 12 h and 24 h) and the cycles of polymerization (conventional, fast cycle, and by microwave energy) on the adaptation of complete denture bases made with the fast polymerization acrylic resin QC-20. Forty-five plaster rock models were made from a metallic master model of an eden
Publicado em: 2001
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32. Dirac's æther in curved spacetime
Proca's equations for two types of fields in a Dirac's æther with electric conductivity sigma are solved exactly. The Proca electromagnetic fields are assumed with cylindrical symmetry. The background is a static, curved spacetime whose spatial section is homogeneous and has the topology of either the three-sphere S³ or the projective three-space P³. Simp
Anais da Academia Brasileira de Ciências. Publicado em: 2000-06
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33. Surface potential decay on naphtalene single crystals / Decaimento de potencial de superfície em monocristais de naftaleno
Using the method of surface potential decay, and thermal stimulated currents, it was possible to study the motion of electrical charges, injected in naphthalene single crystals, by a negative corona discharge in the air. The results obtained in the measurements of the decay, were explained by using a theoretical model of transport of charges in the presence
Publicado em: 1977
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34. "Dark-active" rat transformed into "light-active" rat by destruction of 24-hr clock: function of 24-hr clock and synchronizers.
In alternating 12-hr periods of light and dark the rat is active mainly in the dark. Its activity in the dark (beginning at 1800) depends exclusively on release of activity by the 24-hr clock. In the light (beginning at 0600) the 24-hr clock inhibits activity; the normal rat becomes totally inactive in the light except for activity resulting from external st