Electrical Circuits
Mostrando 13-24 de 95 artigos, teses e dissertações.
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13. Aplicação de redes inteligentes nas instalações elétricas residenciais / Application of smart grid in residential electrical installations.
Electricity as an energy resource acquired vital importance in modern society because it allows relatively easily meet the demand for their services. Thus the demand for electricity increases with the evolution of populations who benefit from. The electrical system that produces this input is limited in its ability to available resources for generation, tran
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 11/04/2012
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14. Vibration energy harvesting using piezoelectric transducer and non-controlled rectifiers circuits
Vibration energy harvesting with piezoelectric materials is of practical interest because of the demand for wireless sensing devices and low-power portable electronics without external power supply. For practical use of vibration energy harvester with piezoelectric materials, it is necessary to process the alternating current (AC) by using different rectifie
J. Braz. Soc. Mech. Sci. & Eng.. Publicado em: 2012
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15. Análise de genes envolvidos no modelo de epilepsia de lobo temporal induzido pela pilocarpina / Analysis of genes involved in the temporal lobe epilepsy induced by pilocarpine
The epilepsies affect approximately 1% of the population worldwide. Temporal lobe epilepsy (TLE) is the most frequent and commonly resistant to clinical treatment. Animal models have been widely used in order to study the mechanisms underlying TLE, especially those induced by chemical agents or electrical stimulation. It is believed that these models present
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 01/11/2011
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16. Estudo do comportamento elétrico de lâmpadas fluorescentes / Study of the electric behavior of fluorescent lamps
This work presents a broad study of the electrical behavior of compact fluorescent lamps. It includes an analysis of the lamp components and the circuit of the reactor; an analysis of the stability on the operating point of the lamp; a study of static and dynamic characteristics; a development of a mathematical model; simulations and experiments. It is also
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 10/06/2011
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17. Structural vibration control using extension and shear active-passive piezoelectric networks including sensitivity to electrical uncertainties
Active-Passive Piezoelectric Networks (APPN) integrate active voltage sources with passive resistance-inductance shunt circuits to a piezoelectric patch. This technique allows to simultaneously passively dissipate vibratory energy through the shunt circuit and actively control the structural vibrations. This work presents an analysis of active-passive dampin
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2011-09
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18. Probabilistic approach for yield analysis of dynamic logic circuits
In deep-submicrometer technologies, process variability challenges the design of high yield integrated circuits. While device critical dimensions and threshold voltage shrink, leakage currents drastically increase, threatening the feasibility of reliable dynamic logic gates. Electrical level statistical characterization of this kind of gates is essential for
Publicado em: 2011
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19. Modeling and simulation of device variability and reliability at the electrical level
In nanometer scale complementary metal-oxide-semiconductor (CMOS) parameter variations pose a challenge for the design of high yield integrated circuits. This work presents models that were developed to represent physical variations affecting Deep- Submicron (DSM) transistors and computationally efficient methodologies for simulating these devices using Elec
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2011
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20. Estudo sobre determinação de parâmetros elétricos de geradores síncronos de polos salientes / Study about determination of electric parameters of synchronous generators of salient poles
Synchronous generators are responsible for almost all electric energy produced in the world. Due to its natural application in electric energy generation of low speed type, salient poles synchronous generators are widely used in hidroelectric energy generation, in energy convertion in ships, emergency engine/generator groups or in local generation not linked
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 12/08/2010
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21. Cálculo de fluxo de potência em alimentadores de distribuião baseado em tensões nodais e de ramos / Distribution power flow based on nodal and branch voltages
Propõe-se nesta dissertação uma formulação e um método iterativo de cálculo para o fluxo de potência em alimentadores primários de Distribuição de Energia Elétrica. Este é formulado com base em equações lineares de circuitos elétricos, para alimentadores primários radiais e fracamente malhados. Para tanto, um modelo linear de circuito é ini
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 02/07/2010
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22. SIMULTANEOUS ALLOCATION OF SERVICES ACTIVE POWER AND REACTIVE AND ACTIVE AND LOSSES REACTION OF TRANSMISSION BASED ON THEORY ELECTRICAL CIRCUIT / ALOCAÇÃO SIMULTÂNEA DE SERVIÇOS DE POTÊNCIA ATIVA E REATIVA E DE PERDAS ATIVA E REATIVA DE TRANSMISSÃO BASEADA NA TEORIA DE CIRCUITOS ELÉTRICOS
Os métodos de alocação de serviços de potência ativa e reativa e das perdas de transmissão ativa e reativa têm recebido cada vez mais atenção após a reestruturação do setor elétrico, que promoveu livre acesso a diversos agentes (geradores e cargas), e com a crescente demanda de energia pela economia global. O principal objetivo dos métodos de a
Publicado em: 2010
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23. Análise do comportamento de uma linha de um pouco mais de meio comprimento de onda sob diferentes condições de operação em regime permanente e durante a manobra de energização / Analysis of the behavior of an isolated transmission line with a little more than half wave lenght for different operating conditions in steady state and during the energization manouver
This work presents an analysis of the behavior of an isolated transmission line with a little more than half-wave length (2600 km) on fundamental frequency, 60 Hz, connected to an infinite busbar for different operating conditions. The voltage and current profiles for different loading conditions are monitored along the line. An analysis of the influence of
Publicado em: 2010
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24. EXPLORAÇÃO DE OPERADORES ARITMÉTICOS NA TRANSFORMADA RÁPIDA DE FOURIER / ARITHMETICS OPERATORS EXPLORATION IN FAST FOURIER TRANSFORM
The power consumption reduction in the fast Fourier transform (FFT) is important because applications in battery-powered embedded systems grows daily. Thus this work focuses on the application of techniques to reduce power in specific projects of FFT algorithms. The goal is to achieve an architectural exploration in the FFT core, the decimation in time butte
Publicado em: 2010