Electrodynamic
Mostrando 1-9 de 9 artigos, teses e dissertações.
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1. A Design of a Compact Microwave Diplexer in Microstrip Technology Based on Bandpass Filters Using Stepped Impedance Resonator
Abstract This paper describes the design of a compact microstrip microwave diplexer based on bandpass filters and a stepped impedance resonator for 4G applications. The diplexer is composed of two band-pass filters (BPF) that operate at 1.8 and 2.5 GHz. Both bandpass filters for the receiver at 1.705-1.895 GHZ and the transmitter at 2.41-2.6 GHZ have a -3dB
Journal of Microwaves, Optoelectronics and Electromagnetic Applications. Publicado em: 2022
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2. Estudo comparativo de um experimento de eletrodinâmica: Laboratório Tradicional x Laboratório Remoto
Resumo Este artigo apresenta um estudo comparativo da aplicação de um experimento de física de eletrodinâmica básica, quando realizado num Laboratório Tradicional (LT) e num Laboratório Remoto (LR) via internet. Para analisar e validar os resultados, realizamos uma análise estatística do ganho de aprendizagem, tamanho do efeito da metodologia aplica
Rev. Bras. Ensino Fís.. Publicado em: 01/07/2019
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3. Optimizing the e-beam profile of a single carbon nanotube field emission device for electric propulsion systems
Abstract: Preliminary studies on field emission (FE) arrays comprised of carbon nanotubes (CNT) as an electron source for electric propulsion system show remarkably promising results. Design parameters for a carbon nanotube (CNT) field-emission device operating on triode configuration were numerically simulated and optimized in order to enhance the e-beam fo
J. Aerosp. Technol. Manag.. Publicado em: 2010-04
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4. Guias de onda com um ambiente para testes de uma eletrodinâmica com violação das simetrias de Lorentz e CPT / Waveguides as a way of testing an electrodynamics with broken Lorentz and CPT symmetries
We study a CPT- and Lorentz-odd electrodynamics in (3+1) dimensions, obtained by adding a Chern-Simons-like term to the usual Maxwell model, as described by the radiation sector of the Standard Model Extension. Once this term is proportional to a constant background "4-vector", (kAF), wich selects a preferred direction in the spacetime (breaking its isotropy
Publicado em: 2010
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5. CONTRIBUTION TO THE CONTROL OF ELECTRODYNAMIC VIBRATION MACHINES / CONTRIBUIÇÃO AO CONTROLE DE MÁQUINAS DE VIBRAÇÃO ELETRODINÂMICAS
This work presents contributions to the sinusoidal acceleration control of electrodynamic shakers applied in vibration testing. Considering the importance of sine tests to identify critical frequencies of operation and to determine mechanical weakness in the specified performance of specimens, vibration controllers are designed to reproduce the amplitude and
Publicado em: 2009
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6. The Computer Science as Didactic Resource for Physics Learning in the Medium Teaching / A Informática como recurso didático para a aprendizagem de Física no ensino médio
The accomplishment of this work was motivated by our concerns, while teacher of Physics discipline, in the medium teaching and in the higher education, where we have been observing a lot of difficulties in the students acting, to the they try to give pursuit out to their studies of the classroom, because of the lack of appropriate equipments, or even, of a l
Publicado em: 2007
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7. ESTUDO DO POTENCIAL DE INTERAÇÃO ELÉTRON-ELÉTRON NO CONTEXTO DA TEORIA DE MAXWELL-CHERN-SIMONSPROCA COM VIOLAÇÃO DE LORENTZ / STUDY OF POTENTIAL OF INTERACTION ELECTRON-ELECTRON IN THE CONTEXT OF THE THEORY OF MAXWELL - CHERN - SIMONSPROCA WITH BREACH OF LORENTZ
This work is initiated with the presentation of an overview on the main theoretical models of planar electrodynamics (QED3), which are studied for their classical solutions. This is done by obtaining the equations of wave, which provide their solutions to the fields and potential. As a result, makes up the youngest of the potential for interaction and ᗹ
Publicado em: 2006
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8. CONTROLE DE ACELERAÇÃO DE UMA MÁQUINA DE VIBRAÇÃO ELETRODINÂMICA / ACCELERATION CONTROL OF AN ELECTRODYNAMIC VIBRATION MACHINE
This work presents the development of a novel digital acceleration controller for sinusoidal vibration tests using switching-mode AC power source (ACPS) fed electrodynamic vibration machines. The proposed scheme is based on the interaction of two control loops: one for the shaker s acceleration regulation and another for the ACPS output voltage control. A ro
Publicado em: 2005
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9. A novel method to study the electrodynamic behavior of actin filaments. Evidence for cable-like properties of actin.
Actin, one of the most abundant intracellular proteins, forms long linear polyelectrolytic polymers in solution. A novel technique to handle single actin filaments in solution was developed that allows the study of ionic currents elicited along the surface of electrically stimulated actin filaments. Electrical currents were observed about the polymer's surfa