External Perturbations
Mostrando 1-12 de 33 artigos, teses e dissertações.
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1. POSTURAL ADJUSTMENTS OF ACTIVE YOUTHS IN PERTURBATION AND DUAL-TASK CONDITIONS
RESUMO Introdução Componentes cognitivos são necessários para manter a postura nas perturbações externas. Porém, poucos estudos investigaram o controle postural quando perturbações externas são associadas à tarefa cognitiva concomitante (TD). Objetivo Analisar o comportamento dos ajustes reativos após perturbação com diferentes intensidades
Rev Bras Med Esporte. Publicado em: 07/10/2019
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2. Research of the Photoelectric Tracking and Pointing Platform Based on the Servo Control System
ABSTRACT: To improve the speed and accuracy of the photoelectric tracking and pointing platform stable tracking, we took the three-axis photoelectric tracking platform, of which the coupling among the rings is ignored, as the research object. Considering the effects of various disturbances, the stable tracking double closed-loop servo control system was buil
J. Aerosp. Technol. Manag.. Publicado em: 18/03/2019
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3. Design of Attitude Control Servomechanisms with Fluid Ring and CMG for Rigid Satellite
ABSTRACT: Satellites cover a wide range of space missions as remote sensing. Accomplishment of the mission depends on satellite's stability maintenance and direction. The main task of the attitude control system is to provide stability to the satellite against external disturbances. Such perturbations are caused due to aerodynamic drag, solar radiation and m
J. Aerosp. Technol. Manag.. Publicado em: 08/11/2018
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4. Ajustes posturais antecipatórios e compensatórios em idosos ativos submetidos a perturbações laterais da postura / Anticipatory and compensatory adjustments in the active older undergoing postural lateral pertubations
Com o avançar da idade, o corpo humano sofre alterações morfológicas e funcionais, que acarretam grande instabilidade postural em idosos. E um fator importante desta, esta vinculada ao uso inadequado das estratégias de ajustes posturais: o ajuste postural antecipatório (APA) e compensatório (APC). Essas estratégias tratam da capacidade de um indivíd
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 02/03/2012
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5. Estudo da interação de nanotubos de carbono com substrato de quartzo cristalino
Single wall carbon nanotubes (SWNTs) are quasi-onedimensional structures consisting of a rolled up graphene nanoribbon. Due to their unusually large surface-to-volume ratio, SWNTs are strongly affected by the environment. Contact with a supporting substrate modifies their properties, and such interactions have been broadly studied as either a drawback or a s
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 24/03/2011
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6. Senses of regression. Theoric and clinical notes on Ferenczi, Balint and Winnicott / Sentidos da regressão. Consideraçõe teoricoclínicas em Ferenczi, Balint e Winnicott
In Psychoanalysis, regression has multiples aspects. One of these aspects is showed by the metapsychological explanation of the dreams formation. Another aspect is presented on the description of primitive traits such as sexual aims, object-relations, and ways of being of some patients in analysis. Regarding the primitive dimension of human psychism, regress
Publicado em: 2009
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7. Dynamic processes in complex networks / Processos dinamicos em redes complexas
We study the statistical properties of in²uence networks subjected to external perturbations. We consider networks whose nodes have internal states that can assume the values 0 or 1. The internal states can change depending on the state of the neighboring nodes. We let N1 nodes be frozen in the state 1, N0 be frozen in the state 0 and the remaining N nodes
Publicado em: 2007
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8. Dependência das propriedades da região-D ionosférica com o ciclo de atividade solar / Dependence of ionospheric D region properties on solar activity cycle
The goal of this work is to provide new clues for a better understanding of the quiescent ionosphere during different solar activity conditions. For that we study the lower ionospheric response to external perturbations, as solar X-rays emitted during flares. We use solar X-ray fluxes provided by GOES satellites, and ionospheric SPA (Sudden Phase Anomalies)
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 06/07/2006
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9. Quantum chaos, dynamical stability and decoherence
We discuss the stability of quantum motion under system's perturbations in the light of the corresponding classical behavior. In particular we focus our attention on the so called "fidelity" or Loschmidt echo, its relation with the decay of correlations, and discuss the quantum-classical correspondence. We then report on the numerical simulation of the doubl
Brazilian Journal of Physics. Publicado em: 2005-06
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10. Experimental study applied to an industrial robot by using variable structure controllers and friction compensation
Control of an industrial robot is mainly a problem of dynamics. It includes non-linearities, uncertainties and external perturbations that should be considered in the design of control laws. In this work, two control strategies based on variable structure controllers (VSC) and a PD control algorithm are compared in relation to the tracking errors considering
Journal of the Brazilian Society of Mechanical Sciences. Publicado em: 2002-11
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11. Determinação da rigidez e amortecimento equivalente proveniente do fluido escoando e interagindo com placas flexiveis : teoria e constatações experimentais
The understanding and modelling of the stiffness and the damping behavior of structures when subjected to a flow field, is still a very complex problem, dealing with the interaction of two major fields of mechanical sciences. The classical theory of elasticity deals with strains of flexible bodies under predefined external loads. Generally, the external load
Publicado em: 2001
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12. Modelos de vidros de spin com interações de ordem alta. / Spin glasses models with high-order interactions.
The statistical properties of the local optima (metastable states) of the infinite range Ising spin glass with p-spin interactions in the presence of an external magnetic field h are investigated analytically. The average number of optima as well as the typical overlap between pairs of identical optima are calculated for general p. For p > 2 and small h w
Publicado em: 2000