Electromagnetic Interaction
Mostrando 1-12 de 48 artigos, teses e dissertações.
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1. Dynamic Arrays Based on Magnetically Controlled Particles: Synthesis and Application
Growth mechanisms of dynamic granular arrays based on magnetically controlled particles are presented. Method of the external rotating magnetic field (ERMF), based on a dipole interaction of magnetic spherical Fe3O4 particles in highly ordered volume arrays is proposed and a design for its practical implementation is developed. The magnetic assembly can resu
Mat. Res.. Publicado em: 19/08/2019
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2. Investigation of Thermal Effects in Coaxial Probe Method and Dielectric Characterization of Glycerol up to 140°C
Abstract Dielectric properties of a material are of paramount importance in many areas of knowledge. All scientific fields that deal with the interaction of electromagnetic radiation with matter demand this information. Consequently, suitable methods for obtaining accurate dielectric data are required. In the microwave community, the dielectric metrology wit
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2019-03
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3. Non-resonant Permittivity Measurement Methods
Abstract The measurement of the dielectric properties of materials has been applied in non-destructive tests, humidity measurement, soil analysis and even cancer detection. The methods have been developed for over 70 years based on the interaction of the electromagnetic waves with the material under test. This work presents a general model of scattering para
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2017-03
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4. RESSONÂNCIA DE PLASMON DE SUPERFÍCIE LOCALIZADO E APLICAÇÃO EM BIOSSENSORES E CÉLULAS SOLARES
Within the last decades, the research on nanoparticles presenting localized surface plasmon resonance has increased constantly. In these materials, the interaction between electrons and incident light results in charge separation, enhancement of the electromagnetic field on the nanoparticles surface and in unique optical properties. Although many metals such
Quím. Nova. Publicado em: 2016-11
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5. Exposure to 50 Hz electromagnetic field changes the efficiency of the scorpion alpha toxin
AbstractBackground Extremely low-frequency (50 Hz) electromagnetic field (ELF-EMF) is produced by electric power transmission lines and electronic devices of everyday use. Some phenomena are proposed as “first effects” of ELF-EMF: the discrete changes in the membrane potential and the increase of the calcium channel activity as well as the intracellular
J. Venom. Anim. Toxins incl. Trop. Dis. Publicado em: 20/10/2015
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6. PIC simulation study of a 35 GHz, 200 kW Gyroklystron
A three-dimensional PIC simulation of a 35 GHz, 200 kW two cavity gyroklystron amplifier has been performed to study the electron beam and RF wave interaction behavior using a commercial PIC code 'MAGIC'. The electromagnetic field analysis of the RF structure in the absence of the electron beam and beam-wave interaction study in the presence of the electron
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2013-12
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7. Analysis and PIC simulation of a Gyrotron travelling wave tube amplifier
The analysis of a Ka-band gyrotron Travelling Wave Tube (gyro-TWT) amplifier using a uniform cylindrical waveguide as its interaction circuit has been presented for the TE01 mode of operation a self-consistent nonlinear analysis in the large signal regime. The analysis predicts that the saturated peak output power of ~ 134 kW with a power conversion efficien
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2013-12
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8. An analysis on electric and magnetic behaviour on an induction planar actuator
The induction planar actuator, i.e. IPA, proposed in this study presents an electromagnetic structure formed by a static ferromagnetic core with an aluminium plate that corresponds to the secondary, and a mover, also called primary. The latter comprehends two three-phase windings, mounted in an armature core, which are orthogonal to each other. When they are
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2013-06
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9. O campo eletromagnético quantizado submetido a ruído e acoplado a um oscilador mecânico / The quantized electromagnetic field submitted to noise and coupled to a mechanical oscillator
In this project we will investigate the influence of noise in the process of interaction of radiation (quantized field) with the matter (mesoscopic mechanical system). We will consider the mode field confined in a cavity of high quality factor with a fixed mirror and one moving mirror, this treated as a mechanical oscillator susceptible to radiation pressure
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 14/05/2012
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10. Reflectivity of Hybrid Microwave Absorbers Based on NiZn Ferrite and Carbon Black
Abstract: This study had as main objective to show that the adequate combination of magnetic and dielectric particles can improve the radar absorbing materials performance. For this, formulations of polyurethane resin loaded with carbon black and NiZn ferrite, with general composition MFe2O4, where M = Ni, Zn or both elements, homogenized by conventional mec
J. Aerosp. Technol. Manag.. Publicado em: 2012-09
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11. Uma contribuição ao conhecimento da física do arco aplicada em soldagem / A contribution to the knowledge of arcs physics applied in welding
Conhecendo os fundamentos físicos que governam os processos de manufatura, é possível incrementar o desenvolvimento dos mesmos de uma forma mais rápida e eficiente. Isto se aplica também para soldagem. Porém, os fenômenos físicos que são envolvidos nos processos de soldagem não são tão esclarecidos, principalmente pela dificuldade em estudá-los
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 29/09/2011
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12. RESPOSTA ESPECTRAL DE FOLHAS DE Eucalyptus globulus (Labill.) ATACADAS POR Mycosphaerella spp. / SPECTRAL RESPONSE OF Eucalyptus globulus (Labill.) LEAFS ATTACKED BY Mycosphaerella spp.
Eucalyptus globulus one of the most important species for paper and pulp industries, nowadays faces development problems in several countries due to its susceptibility to the fungus Mycosphaerella spp., which causes leaf spots that may cause the crown defoliation. The study aims at analyzing the spectral behavior of E. globulus leafs in response to the sever
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 25/02/2011