Electric Section
Mostrando 1-12 de 34 artigos, teses e dissertações.
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1. Ultra Wide Band Radar Cross Section Reduction of a Perfectly Electric Conductor Sphere by the Application of Multilayer Metamaterial Coatings
Abstract A full-wave analytical method using the addition theorems and Hertzian potential functions are used to compute the radar cross section of a sphere coated by several layers composed of common materials and metamaterials. The minimization and maximization of radar cross section of a perfectly electric conductor sphere with such coatings are realized i
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2016-12
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2. CHOOSING THE OPTIMAL GEL MORPHOLOGY IN ELECTROPHORESIS SEPARATION BY A DIFFERENTIAL EVOLUTION APPROACH (DEA)
Abstract This paper introduces an effective optimization approach to investigate the morphological effects of nanocomposite gel electrophoresis and operational parameters (see below) by integrating the numerical simulations based on finite element method and population-based search algorithm such as differential evolution. Simulations are performed to study
Braz. J. Chem. Eng.. Publicado em: 2016-03
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3. An efficient coupled polynomial interpolation scheme to eliminate material-locking in the Euler-Bernoulli piezoelectric beam finite element
The convergence characteristic of the conventional two-noded Euler-Bernoulli piezoelectric beam finite element depends on the configuration of the beam cross-section. The element shows slower convergence for the asymmetric material distribution in the beam cross-section due to 'material-locking' caused by extension-bending coupling. Hence, the use of convent
Lat. Am. j. solids struct.. Publicado em: 2015-01
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4. The Update of an Aerodynamic Wind-Tunnel for Aeroacoustics Testing
ABSTRACT: This paper describes the update and characterization of a previously pure aerodynamics wind-tunnel into a facility able to simultaneously execute aerodynamics and aeroacoustics testing. It is demonstrated that the application of high-performance acoustic materials on strategic positions of the wind-tunnel circuit and punctual actions can substantia
J. Aerosp. Technol. Manag.. Publicado em: 2014-06
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5. Initial public offering-ipo x retorno : uma investigação empírica nas empresas do setor de energia elétrica
This research has as objective evaluates the return of the stocks of the companies of the Brazilian electric section, striped in BOVESPA. In that sense, it was looked for to verify the accomplishment of IPO it caused over evaluation effect or of under evaluation in the price of the stocks of the companies of the electric power section that it accomplished th
Publicado em: 2009
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6. Boundary Element Method for Electrical Impedance Tomography / Método dos elementos de contorno para tomografia de impedância elétrica
The Electrical Impedance Tomography (EIT) is a quite new technique and has proved to be promising in obtaining inner body images exploring the differences between electric qualities (conductivity and permissity) of different materials that constitute it. The technique is based on applying an electric potential profile or electric current on the boundary of t
Publicado em: 2009
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7. Estudo do retorno das aÃÃes das empresas brasileiras de energia elÃtrica : uma anÃlise comparativa utilizando os modelos CAPM, Fama e French e quatro - fatores de Carhart
Este trabalho tem como objetivo precÃpuo realizar anÃlise do retorno das aÃÃes de empresas do setor energÃtico brasileiros negociadas na Bolsa de Valores de SÃo Paulo (Bovespa), no perÃodo de 1999 a 2007, testando empiricamente e comparando os modelos CAPM, Fama e French e 4 fatores de Carhart (1997). Para tanto, foi realizada, inicialmente, investiga
Publicado em: 2009
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8. Desenvolvimento de metodologias para o estudo do efeito Raman normal e ressonante utilizando modelos Ab initio dependentes do tempo / Development of methodologies for the study of normal and resonance Raman effect using Ab initio time-dependent models
In this work new methodologies for the calculation of absolute vibrational Raman intensities of gaseous systems are presented. In order to reduce the computational requirements in these calculations two families of compact basis functions were generated from the effective core potential valence basis sets SBKJC and Stuttgart-Cologne through the Sadlej s elec
Publicado em: 2009
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9. Effect of inoculation on the grain macrostructure of Al-Si alloys obtained by unidirectional solidification. / Efeito da inoculação na macroestrutura de grãos de ligas AI-Si obtidas por solidificação unidirecional.
The development of various industrial sectors, such as the automotive and the aerospace industry, demand premium aluminum castings with strict control of mechanical properties. To fulfill these requirements, the control of solidification processes and the knowledge of relations between the processing variables and the casting properties are necessary. The me
Publicado em: 2009
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10. Development of a methodology for identification of cardiac region in images of electrical impedance tomography of pulmonary perfusion by means of wavelet transform / Desenvolvimento de uma metodologia para identificação de região cardíaca em imagens de tomografia de impedância elétrica de perfusão pulmonar por meio da transformada wavelet
Electrical Impedance Tomography (EIT) is an imaging technique, still in development, which allows imaging of the distribution of conductivity in a cross section of an object under analysis from electrical measures made on its surface. Despite its benefits and advantages over other imaging techniques, its images still do not offer a good spatial resolution. O
Publicado em: 2009
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11. Conflito, consenso, democracia e capitalismo em estados periféricos : o processo de privatização do setor elétrico no Brasil e na Argentina
This thesis analyzes the political and economical arguments that furnished a broad consensus for the implementation of the structural adjustments in the 1990s, amongst them the privatization programme of the electrical energy sector in Brazil and Argentina. It is considered whether the restructuring of the electric section accomplished the presuppositions on
Publicado em: 2009
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12. Princípios básicos e aplicação da iontoforese na penetração cutânea de fármacos
Physicochemical constraints severely limit the number of molecules that can be considered as candidates for transdermal delivery. Iontophoresis is a non-invasive technique in which a weak electric current is used to enhance the penetration of molecules into or through the skin. In this review the underlying mechanisms that drive iontophoresis and the impact
Química Nova. Publicado em: 2008