Wave Scattering
Mostrando 1-12 de 71 artigos, teses e dissertações.
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1. Design and Synthesis of an Ultra Wide Band FSS for mm-Wave Application via General Regression Neural Network and Multiobjective Bat Algorithm
Abstract In this work is presented a hybrid bioinspired optimization technique that associates a General Regression Neural Network (GRNN) with the Multiobjective Bat Algorithm (MOBA), for the design and synthesis of the Frequency Selective Surfaces (FSS), aiming its application in data communication systems by diffusion of millimeter waves, specifically, in
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 11/11/2019
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2. Ultrafast Dynamics of Au Nanopyramid Interfaces Prepared by Nanosphere Lithography: Effect of Substrate Chemical Composition
This work describes ultrafast spectroscopy studies of Au triangular pyramid particle arrays deposited over glass (termed Au/glass), and 190 nm indium tin oxide (ITO) film (termed Au/ITO/glass) prepared by nanosphere lithography. The linear absorption spectra of Au/glass and Au/ITO/glass exhibit surface plasmon resonances at 800 and 870 nm, respectively, in g
J. Braz. Chem. Soc.. Publicado em: 2016-02
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3. Simulation of irregular waves over submerged obstacle on a NURBS potential numerical wave tank
In this paper, a fully non-linear three-dimensional Numerical Wave Tank (NWT) is developed for studying propagation and scattering of non-linear random sea wave over bottom submerged bars. The simulation of fully non-linear free-surface is based on Non-Uniform Rational B-Spline formulation (NURBS) as a novel approach and Mixed Eulerian-Lagrangian method (MEL
Lat. Am. j. solids struct.. Publicado em: 2014
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4. Development of computational 3D MoM algorithm for nanoplasmonics
In this paper, we present an algorithm for full-wave electromagnetic analysis of nanoplasmonic structures. We use the three-dimensional Method of Moments to solve the electric field integral equation. The computational algorithm is developed in the language C. As examples of application of the code, the problems of scattering from a nanosphere and a rectangu
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2013-12
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5. Resonant properties, of modified triangular plasmonic nanoparticles with higher field concentration
In this paper, we present an analysis of the resonant response of modified triangular metallic nanoparticles with polynomial sides. The particles are illuminated by an incident plane wave and the method of moments is used to solve numerically the electromagnetic scattering problem. We investigate spectral response and near field distribution in function of t
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2013-12
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6. Avaliação de concreto auto-adensável com agregado reciclado de telha cerâmica / Evaluation of self-compacting concrete produced with the recycled aggregate tile
The increasing demand for raw materials in construction, especially those drawn from nature, is of great concern due to harmful impacts it produces. The use of recycled aggregates can be a sustainable and contribute to the preservation of natural resources, contributing to the sustainable development of the construction industry. The residue from the ceramic
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 27/08/2012
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7. Scattering analysis of planar electric and magnetic dipoles in multilayered chiral structures
This paper describes a model for the analysis of multilay-ered chiral structures containing planar electric and magnetic scattering elements of arbitrary shape, illuminated by an elliptically polarized plane wave. The particular case of a single chiral layer is analyzed and the scattering matrices for single and dual electric and/or magnetic dipole distribut
Journal of Microwaves, Optoelectronics and Electromagnetic Applications. Publicado em: 2012-06
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8. Spectral domain analysis of double screen frequency selective surfaces
This paper presents a numerical investigation for a double screen frequency selective surface (FSS) with perfectly conducting rectangular patch elements. The analysis uses a full wave technique to obtain the scattering characteristics. The analysis combines the immitance approach and the method of moments to obtain the scattered fields and, consequently, the
Journal of Microwaves, Optoelectronics and Electromagnetic Applications. Publicado em: 2012-06
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9. 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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10. Modelagem computacional de problemas de espalhamento de ondas eletromagnéticas / Computational modeling of electromagnetic wave scattering problems
Esta tese tem por objetivo apresentar um estudo sistemático da resolução,em duas dimensões espaciais, de problemas de espalhamento de ondas eletromagnéticas por meios condutores e meios dielétricos homogêneos e heterogêneos, envolvendo fontes singulares, números de onda elevados e condições de contorno absorventes, modelados pela equação de Helm
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 26/08/2011
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11. Ondas de choque em condensados de Bose-Einstein e espalhamento inelástico de átomos em um potencial de dois poços / Shock waves in Bose-Einstein condensates and inelastic scattering of atoms in a double well
Nesta tese estudamos dois problemas diferentes na área de átomos ultra frios: Ondas de choque em condensados de Bose-Einstein e Espalhamento inelástico de átomos em um potencial de dois poços. No primeiro problema, estudamos o fluxo supersônico de um condensado de Bose-Einstein (BEC) através de um obstáculo macroscópico impenetrável delgado no sist
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 28/03/2011
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12. Expansão de campos eletromagnéticos arbitrários em termos de funções de onda vetoriais / Expansion of arbitrary electromagnetic fields in terms of vector spherical wave functons
Desde 1908, quando Mie apresentou expressões analíticas para os campos espalhados por uma partícula esférica sob incidência de uma onda eletromagnética plana, generalizações para esta expansão têm se mostrado incompletas. Isto se deve à presença de certos termos com dependência radial nos coe cientes de forma do feixe quando expandido em termos
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 12/11/2010