Function Of Complex Variable
Mostrando 1-12 de 89 artigos, teses e dissertações.
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1. An efficient mechanical-probabilistic approach for the collapse modelling of RC structures
Resumo As estruturas em concreto armado são largamente utilizadas ao redor do mundo. Entretanto, a modelagem de seu complexo comportamento mecânico por formulações numéricas eficientes tem sido marginalmente apresentada na literatura. As formulações eficientes possibilitam a precisa e realista representação dos fenômenos mecânicos envolvidos e sã
Rev. IBRACON Estrut. Mater.. Publicado em: 20/05/2019
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2. The Long-Range Memory and the Fractal Dimension: a Case Study for Alcântara
ABSTRACT: This study aimed to analyze the time series behavior of the Southern Oscillation Index through techniques using Fast Fourier Transform, computing the autocorrelation function, and the calculation of the Hurst coefficient. The methodology of Hurst Exponent calculation uses different lags, which are computed in the time series of Southern Oscillation
J. Aerosp. Technol. Manag.. Publicado em: 24/08/2017
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3. Construcción de la Función Integral y Razonamiento Covariacional: dos Estudios de Casos
Abstract The aim of this paper is to characterize how high school students build the integral function concept in the context of a teaching experiment using applets, and designed according to a hypothetical learning trajectory. Five out of fifteen students were chosen, which have participated in the teaching experiment and shown different moments of reflecti
Bolema. Publicado em: 2017-08
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4. Continuous Modeling Technique of Fiber Pullout from a Cement Matrix with Different Interface Mechanical Properties Using Finite Element Program
Abstract Fiber-matrix interface performance has a great influence on the mechanical properties of fiber reinforced composite. This influence is mainly presented during fiber pullout from the matrix. As fiber pullout process consists of fiber debonding stage and pullout stage which involve complex contact problem, numerical modeling is a best way to investiga
Lat. Am. j. solids struct.. Publicado em: 2016-10
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5. Design Optimization of a Random Suspension Device Considering a Reliability Constraint on the Frequency Response Function
Abstract This work deals with the design of a suspension device, idealized as a spring-mass-damper system. The amplitude of a nominal system is constrained to satisfy certain limitations in a given frequency band and the design is to be done as a reliability-based optimization. This constitutes a major difficulty since the constraint becomes a random process
Lat. Am. j. solids struct.. Publicado em: 2016-06
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6. Dépendance à l'adolescence: le vide par l'excès
Dependence in adolescence: the vacuum by the excess. The link is perceived at the same time as a condition and a variable of the psychic, but also the question which returns to the absence and to the separation. However, for certain teenagers if the central question of the link is exactly the possibility to symbolize an absence, we can imagine that the const
Ágora (Rio J.). Publicado em: 2014-08
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7. Estimador de variações de tensão de curta duração em sistemas elétricos de potência utilizando estratégias evolutivas. / Estimate short duration voltage variation using evolutionary strategies.
A methodology is herein proposed to estimate Short Duration Voltage Variation (SDVV) in electric power systems, caused by electrical faults. To attain this target, values recorded by measurement equipment in specific sites are used. In fact, there are few power quality meters installed in power networks, due to the high cost of such meters. Although these co
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 19/09/2011
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8. ROBUST VARIABLE STRUCTURE MODEL REFERENCE ADAPTIVE CONTROL APPLIED TO ACTIVE POWER FILTERS / CONTROLE ADAPTATIVO ROBUSTO DE ESTRUTURA VARIÁVEL POR MODELO DE REFERÊNCIA APLICADO A FILTROS ATIVOS DE POTÊNCIA
This works presents a Robust Variable Structure Model Reference Adaptive Control scheme denoted VSRMRAC. In this adaptive control strategy, each parameter of the control law is obtained by the sum of two other adaptive terms. One of them is associated with the RMRAC algorithm, while the other is composed of an adaptive gain rated by an approximated sign func
Publicado em: 2010
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9. Modeling of dynamic rotors with flexible bearings due to the use of viscoelastic materials
Nowadays rotating machines produce or absorb large amounts of power in relatively small physical packages. The fact that those machines work with large density of energy and flows is associated to the high speeds of rotation of the axis, implying high inertia loads, shaft deformations, vibrations and dynamic instabilities. Viscoelastic materials are broadly
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2008-03
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10. Structural analysis of bending stiffeners with complex geometries utilized in offshore operations. / Análise estrutural de enrijecedores à flexão de geometria complexa utilizados em operações offshore.
The bending stiffeners discussed in this work are ancillary structural components installed on flexible lines at their connections with floating units in offshore oil production systems. The configuration of these accessories must provide the installation with a gradual variation of the bending stiffness near the lines attaching point, smoothing the curvatur
Publicado em: 2008
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11. Síntese, estudo cinético e análise microestrutural do sistema cério-níquel obtido pelo método pechini
The cerium oxide has a high potential for use in removing pollutants after combustion, removal of organic matter in waste water and the fuel-cell technology. The nickel oxide is an attractive material due to its excellent chemical stability and their optical properties, electrical and magnetic. In this work, CeO2-NiO- systems on molars reasons 1:1(I), 1:2(II
Publicado em: 2008
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12. Manufacturing constraints applied to the topology optimization method. / Restrições de manufatura aplicadas ao método de otimização topológica.
The design of a mechanical component is a very complex task, which includes constraints such as maximum weight and maximum stiffness, and also manufacturing constraints, associated with the manufacturing processes required at the shop floor. It is known that Topology Optimization (TO), despite of being a very effective and powerful method to obtain optimal s
Publicado em: 2008