Quasi Fields
Mostrando 1-12 de 26 artigos, teses e dissertações.
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1. Multicomponent positive psychology intervention for health promotion of Brazilian retirees: a quasi-experimental study
Abstract This study evaluated the effects and impact of a multicomponent positive psychology program for health promotion of retirees. A quasi-experimental longitudinal design was used, and the baseline and end of intervention evaluations were analyzed. The intervention consisted of six weekly group sessions for 2 h each. Eighty-eight retirees (females = 72)
Psicol. Reflex. Crit.. Publicado em: 28/03/2019
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2. Investigations on the mechanism and behavior of dynamic energy absorption of metal foam
Abstract Metal foams have been widely used in the engineering fields due to its excellent energy absorption capacity under impact. Under different impact velocities, metal foam exhibits different energy absorption properties. It is important to investigate the mechanism and behavior of energy absorption of metal foam under impact. In this study, a 3D micros
Lat. Am. j. solids struct.. Publicado em: 02/07/2018
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3. Reduced Order Modeling of Composite Laminates Through Solid-Shell Coupling
ABSTRACT: Composite laminates display a complex mechanical behavior due to their microstructure, with a through-thickness variation of the displacement and stress fields that depends on the fiber orientation in each layer. Aiming to develop reduced-order numerical models mimicking the real response of composite structures, we investigated the capability and
J. Aerosp. Technol. Manag.. Publicado em: 26/06/2017
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4. Use of an Artificial Neural Network-based Metamodel to Reduce the Computational Cost in a Ray-tracing Prediction Model
Abstract The purpose of this article is based on analyzing the use of RTQ3D (“quasi-3D” ray tracing technique) to produce the value of the initial electromagnetic fields or fitness for a hundred and sixty receivers according to the possible positions of two antennas to be distributed in a closed environment. The problem variables consist of the values of
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2016-12
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5. Simulation of Stress Concentration Problems in Laminated Plates by Quasi-Trefftz Finite Element Models
Abstract Hybrid quasi-Trefftz finite elements have been applied with success to the analysis of laminated plates. Two independent fields are approximated by linearly independent, hierarchical polynomials: the stress basis in the domain, adapted from Papkovitch-Neuber solution of Navier equations, and the displacement basis, defined on element surface. The st
Lat. Am. j. solids struct.. Publicado em: 2016-09
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6. Rigidez de superfÃcies de contato e caracterizaÃÃo de variedades riemannianas munidas de um campo conforme ou de alguma mÃtrica especial / Rigidity of the contact surfaces and characterization of Riemannian manifolds carrying a conformal vector fields or some special metric
Esta tese està composta de quatro partes distintas. Na primeira parte, vamos dar uma nova caracterizaÃÃo da esfera euclidiana como a Ãnica variedade Riemanniana compacta com curvatura escalar constante e admitindo um campo de vetores conforme nÃo trivial que à tambÃm Ricci conforme. Na segunda parte, provaremos algumas propriedades dos quase sÃlitons
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 29/06/2012
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7. Perturbações gravitacionais e propagação de ondas em buracos negros com campos eletromagnéticos / Gravitational perturbations and wane propagation in black holes with magnetic fields
Neste trabalho faremos uma investigação no campo das perturbações gravitacionais e propagação de ondas em geometrias de buracos negros com campos elétricos ou magnéticos. Usando uma geometria tipo Ernst-Melvin de um buraco negro massivo em um Universo com campo magnético no eixo z, calculamos os modos quasi-normais de propagação de um campo escala
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 30/08/2011
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8. Fundamentação computacional da matemática intervalar
A Matemática Intervalar se assenta em dois conceitos fundamentais, a propriedade da inclusão-monotonicidade de sua aritmética e uma topologia de Hausdorff definida no conjunto dos intervalos. A propriedade da inclusão-monotonicidade tem se revelado uma ferramenta útil na elaboração de algoritmos intervalares, enquanto a topologia de Hausdorff não con
Publicado em: 2010
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9. Linear pertubations of black roles: stability, quasi-normal modes and tails / Perturbações lineares de buracos negros: estabilidade, modos quase-normais e caudas
Black holes have their proper oscillations, which are called the quasi-normal modes. The proper oscillations of astrophysical black holes can be observed in the nearest future with the help of gravitational wave detectors. Quasi-normal modes are also very important in the context of testing of the stability of black objects, the anti-de Sitter/ Conformal Fie
Publicado em: 2009
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10. Análise teórica e experimental de superfícies seletivas de freqüência e suas aplicações em antenas planares
This work presents a theoretical and numerical analysis of structures using frequency selective surfaces applied on patch antennas. The FDTD method is used to determine the time domain reflected fields. Applications of frequency selective surfaces and patch antennas cover a wide area of telecommunications, especially mobile communications, filters and WB ant
Publicado em: 2009
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11. Barotropic instability process of Brazil current at Santos Basin / Processos de instabilidade barotrópica da Corrente do Brasil na Bacia de Santos
The Brazil Current (BC) is formed at the bifurcation of the southern branch of the South Equatorial Current and flows south-southeastward off the east, southeast and southern Brazilian continental margin, exhibiting intense meso-scale activity between the Vitória-Trindade Ridge (20oS) and Cape Santa Marta Grande (28oS). The knowledge of such activity, built
Publicado em: 2009
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12. Signatures of two distinct driving mechanisms in the evolution of coronal mass ejections in the lower corona / Assinaturas de dois mecanismos distintos na evolução de ejeções de massa coronal na baixa coroa
Coronal mass ejections (CMEs) are the major driver for space weather disturbances. Their physical mechanisms and their influence on the geospace environment are the subject of active research and debate. Our goal is to understand how the initial magnetic configuration of a CME affects its evolution through the lower corona, until 6R⊙. We compare ou
Publicado em: 2009