Electromagnetic Sources
Mostrando 1-12 de 24 artigos, teses e dissertações.
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1. Electromagnetic Core Analysis of a DFIG State-Feedback Power Controller
Abstract The energy demand by modern society grows every day that allied with sustainable development requires the use of alternative sources in the new energy matrix. In this context, the wind energy as source by using a doubly-fed induction generator stands out due to its operational savings but still faces some conflicts in its power control. This paper p
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 12/09/2019
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2. A Hybrid Approach for Assessments of Equivalent Emission Sources and Electromagnetic Environments
Abstract This paper presents a method for equivalent emission source determination by application of LLAs (Large Loop Antennas). A review of different types of LLAs is carried out and their characteristics regarding emission source evaluation are emphasized. A hybrid technic is applied for obtaining the electric fields based on previous measurement of magnet
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2018-03
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3. Improvement of Circularly Polarized Slot-Patch Antenna Parameters by Using Electromagnetic Band Gap Structures
Abstract This paper is devoted to the design of a novel Electromagnetic Band Gap (EBG) circularly polarized slot-patch antenna in multilayered configuration. The operating frequency band can be controlled via the disk radius and adjusting the slit lengths. An arrangement combining the circular slot-patch antenna design and feeding sources included are consid
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2016-12
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4. Micro-motion Recognition of Spatial Cone Target Based on ISAR Image Sequences
ABSTRACT The accurate micro-motions recognition of spatial cone target is the foundation of the characteristic parameter acquisition. For this reason, a micro-motion recognition method based on the distinguishing characteristics extracted from the Inverse Synthetic Aperture Radar (ISAR) sequences is proposed in this paper. The projection trajectory formula o
J. Aerosp. Technol. Manag.. Publicado em: 2016-06
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5. NUMERICAL MODELING OF HEAVY HYDROCARBON LIQUID HEATING
Abstract The results of two-dimensional mathematical modeling of heat and mass transfer in a highly viscous hydrocarbon liquid by inductive and radio-frequency (RF) electromagnetic (EM) heating are presented. The model takes into account the dependence of the liquid's viscosity and thermal conductivity on the temperature and also the presence of thermal conv
Braz. J. Chem. Eng.. Publicado em: 2016-03
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6. Measurement with quasi-isotropic antenna of CEM coming from multisource in a reverberation chamber and in a car
The concern about the health risks that wireless technology can provide has grown globally thanks to the growing use of the devices by the population, by the finding that the public exposure to EMFs from the devices can be enhanced by the reflection of the microwave indoors. This paper will assess the distribution of electromagnetic field in a car, in order
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2013-12
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7. Modeling of electromagnetic waves propagation in four-level two-electron atomic systems governed by Pauli Exclusion Principle using the TLM method
This paper presents a computational model of electrons dynamics and gain in four-level two-electron atomic systems. These systems, submitted to an electromagnetic wave, are governed by Pauli Exclusion Principle and they are modeled using the Time-Domain Transmission Line Matrix (TLM) method with the symmetrical condensed node (SCN) with novel voltage sources
Journal of Microwaves, Optoelectronics and Electromagnetic Applications. Publicado em: 2012-06
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8. Equações de onda para grávitons com fontes eletromagnéticas em espaços curvos sem torção / Wave equations for gravitons with electromagnetic sources in curved spacetimes without torsion
Os formalismos espinoriais de Infeld e van der Waerden são utilizados para descrever a estrutura de curvaturas espaço-temporais da Relatividade Geral. São apresentados os contextos métricos dé cada formalismo assim como o comportamento de seus objetos básicos sob transformações de calibre de Weyl. O desdobramento de curvaturas em partes puramente gra
Publicado em: 2011
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9. Aplication of unscented transformed (ut) for design filters microwave / Aplicação da transformada de incerteza (ut) para projeto de filtros de microondas
The manufacture of complex filters and their tests depend on electromagnetic simulation for validation and correct analysis. However, in the filter assembly, the fabrication process introduces new sources of uncertainty that are difficult to model with the electromagnetic simulator. The result may be significant differences between the simulated responses an
Publicado em: 2010
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10. Simulador eletromagnético em um ambiente de grades computacionais / Eletromagnetic simulator in a grid computing environment
The aim of this work is to develop the Pre and Post-Processing stages from an electromagnetic simulation suite, called SSAR-BR, and also a grid computational environment, which permits the execution of large electromagnetic problems. The processing stage, based in the Finite Difference Time Domain (FDTD) method, has been already developed as part of a doctor
Publicado em: 2010
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11. Airborne geophysical and geological data applied to the selection of groudwater potential areas in crystalline rocks of Ceara, Brazil / Dados aerogeofisicos e geologicos aplicados a seleção de areas favoraveis para agua subterranea no dominio cristalino do Ceara, Brasil
The location of water well in Northeast Brazil is usually based on the interpretation of structural lineaments in aerial-photographs and electromagnetic and electrical resistivity ground geophysics surveys. However, the success of these techniques is variable, and the small coverage area is another limitation. This Thesis favors a different approach, the use
Publicado em: 2008
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12. Análise de antenas refletoras circularmente simétricas com a presença de corpos dielétricos
This work develops theoretical, analytical and numerical tools for solution of electromagnetic scattering from bodies of revolution, composed by perfect conductors and dielectrics, such as reflector antennas with radomes. Accurate analyses of these structures are performed through algorithms based on electric and magnetic integral equations, numerically eval
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 04/05/2007