Asymptotic Behaviour
Mostrando 1-10 de 10 artigos, teses e dissertações.
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1. Transverse Motions of Rectangular Plates Resting on Elastic Foundation and Under Concentrated Masses Moving at Varying Velocities
AbstractThis study concerns the dynamic characteristics of a prestressed isotropic, rectangular plate continuously supported by an elastic foundation and carrying accelerating mass M. Closed form solutions of the governing fourth order partial differential equations with variable and singular coefficients are presented. For the two-dimensional plate problem,
Lat. Am. j. solids struct.. Publicado em: 2015-07
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2. Equações diferenciais ordinárias generalizadas e aplicações às equações diferenciais clássicas / Generalized ordinary differential equations and applications to classical differential equations
O objetivo deste trabalho e estudar algumas propriedades de soluções de equações diferenciais ordinárias generalizadas e aplicar tais resultados a algumas equações diferenciais clássicas (equações diferenciais ordinárias abstratas e equações diferenciais funcionais em medida). Os principais resultados tratam de existência-unicidade de soluçõe
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 21/08/2012
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3. Semicontinuidade inferior de atratores para problemas parabólicos em domínios finos / Lower semicontinuity of attactors for parabolic problems in thin domains
Neste trabalho estudamos problemas de reação-difusão semilineares do tipo u IND..t(x, t) = DELTAu(x, t)+ f (u(x, t)), x PERTENCE AOMEGAPARTIALU/PARTIALV (x, t) = 0, x PERTENCE APARTIALOMEGA. Desenvolvemos uma teoria abstrata para a obtenção da continuidade da dinâmica assintótica de (P) sob perturbações singulares do domínio espacial W e aplicamos
Publicado em: 2007
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4. 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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5. Modified Lyapunov equations for LTI descriptor systems
For linear time-invariant (LTI) state space systems it is well-known that its asymptotic stability can be related to solution properties of the Lyapunov matrix equation according to so-called inertia theorems. The question now arises how analogous results can be obtained for LTI descriptor systems (singular systems, differential-algebraic equations). The sta
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2006-12
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6. Modelling Complex Longitudinal Survey Data
Modelling methods for longitudinal complex survey data are investigated in this thesis. An empirical investigation using longitudinal survey data is conducted. Variance effects of clustering are identified and results indicate that clustering impacts may be stronger for longitudinal studies than for cross-sectional studies. Earlier empirical evidence that th
Publicado em: 2005
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7. OTIMIZAÇÃO DE FORMA DE MODELOS BIDIMENSIONAIS DE ELEMENTOS FINITOS COM COMPORTAMENTO ELASTO-PLÁSTICO / OPTIMIZACIÓN DE FORMA DE MODELOS BIDIMENSIONALES DE ELEMENTOS FINITOS CON COMPORTAMIENTO ELÁSTICO-PLÁSTICO / SHAPE OPTIMIZATION OF 2D FINITE ELEMENT MODELS CONSIDERING ELASTO-PLASTIC BEHAVIOUR
The main goal of this work is to present an integrated system for the optimization of plane structures with elastoplastic behavior. The methodology proposes an alternative for the conservative way in which structures traditionally have been optimized, i.e., that they present linear elastic behavior. The computational system is said to be integrated because i
Publicado em: 2000
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8. Quantização de solitons no modelo de Gross-Neveu
Using the order-disorder formalism we obtain the explicit form or the soliton operator of the Gross-Neveu model and we calculate, in a particuar aproximation, the two point correlation function of these operators. From the asymptotic behaviour of this function we obtain the soliton mass. As a by-product we calculate the fermionic determinant. ( i¶ - m + aA
Publicado em: 1990
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9. Transient dynamics and food-web complexity in the Lotka-Volterra cascade model.
How does the long-term behaviour near equilibrium of model food webs correlate with their short-term transient dynamics? Here, simulations of the Lotka -Volterra cascade model of food webs provide the first evidence to answer this question. Transient behaviour is measured by resilience, reactivity, the maximum amplification of a perturbation and the time at
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10. Comparison of average estimated metabolic rates for styrene in previously exposed and unexposed groups with pharmacokinetic modelling.
OBJECTIVE: To understand whether previous styrene exposure increases the human liver's ability to convert styrene into styrene oxide. METHODS: The hypothesis was tested that the average linear metabolic rate constant kappa was the same in both exposed and unexposed groups, when the exposed group comprised people with a history of styrene exposure and the une