Attractors
Mostrando 13-24 de 48 artigos, teses e dissertações.
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13. Atratores para sistemas dinâmicos discretos: dimensão fractal e continuidade da estrutura por perturbações / Discrete dynamical systems attractors: fractal dimension and continuity of the structure under perturbations
In this work, we study a generalization of gradient discrete semigroups, the gradientlike semigroups, some of its properties and its invariance under small perturbations; that is, small perturbations of gradient-like semigroups are still gradient-like semigroups. As a consequence of the characterization of the attractors for this sort of semigroups, we study
Publicado em: 2009
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14. Identificação remota de sistemas operacionais utilizando análise de processos aleatórios e redes neurais artificiais
A new method to perform TCP/IP fingerprinting is proposed. TCP/IP fingerprinting is the process of identify a remote machine through a TCP/IP based computer network. This method has many applications related to network security. Both intrusion and defence procedures may use this process to achieve their objectives. There are many known methods that perform t
Publicado em: 2009
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15. ERP systems implementation in complex organizations
ERP (Enterprise Resource Planning) systems implementation is a great organizational change, which many times does not reach the desired results. This paper proposes to help understand this implementation, considering that the knowledge of change and evolution processes in organizations may lead to other aspects to be considered, assisting in the identificati
JISTEM - Journal of Information Systems and Technology Management. Publicado em: 2009
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16. A arquitetura da cidade e os transportes : o caso dos congestionamentos em Fortaleza - Ceará
This doctoral research proposes a systemic methodology of street vehicular congestion analysis, pictured by some traffic jammed areas and its problems of land use accessibility and urban car mobility in Fortaleza city, capital of Ceará State, Brazil. The approach offers a composed computational modeling in Geographic Information System environment by joinin
Publicado em: 2009
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17. O jogo de futebol : investigação de sua estrutura, de seus modelos e da inteligencia de jogo, do ponto de vista da complexidade / The soccer game ; : searche of this structure, its models and intelligence of the game from the point of view of complexity
In high-level sports, small things make difference between the first and second positions. The game, and in this is case the soccer game, is a complex phenomenon where the player s performance is transdimensional. At every time players and teams meet problem-situations, in unpredictable circumstances that need fast technical, tactical, physical and psycholog
Publicado em: 2009
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18. A simplified Fermi Accelerator Model under quadratic frictional force
Some dynamical properties for a simplified version of a one-dimensional Fermi Accelerator Model under the action of a small dissipation is studied. The dissipation is introduced via a damping force which is assumed to be proportional to the square particle's velocity. The dynamics of the model is described by using a two-dimensional, nonlinear area contracti
Brazilian Journal of Physics. Publicado em: 2008-03
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19. Sincronização de uma classe de sistemas não-lineares acoplados com aplicações em sistemas elétricos de potência / Synchronization of a class of coupled non-linear systems with applications in electric power systems
Synchronization of a class of coupled non-linear systems is studied in this work. From the theoretical point of view, we present synchronization results that provide sufficient conditions on the vector field and estimates of the coupling parameters that guarantee synchronization. Differently from the existing approaches in the nonlinear systems literature, o
Publicado em: 2008
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20. Ecologia da pesca e biologia reprodutiva do acará-disco (Symphysodon aequifasciatus, Pellegrin 1904) (Perciformes: Cichlidae) na RDS Piagaçu-Purus, Amazônia Central: subsídios para o manejo sustentável de um recurso natural.
Historically ornamental fish have been commercially exploited in the Amazon. Nevertheless this exploitation has been carried out without much planning with little attention to the vulnerability of the fish population or to the social economical aspects of the activity for the local fishermen. Among the most known ornamental fish species commercially used is
Publicado em: 2008
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21. A dinâmica caleidoscópica do processo de aprendizagem coloborativa no contexto virtual:: um estudo na perspectiva da complexidade/caos
In recent years there has been significant amoung of research guided by completxity and chaos theories in the area of Applied linguistics (Larsen-Freeman, 1997; Paiva, 2005; van Lier, 2004, Lantolf, 2006, Cameron and Deignan, 2006, among others). The ideas of complexity/chaos consider the inter-relation of agents in a complex system is dynamic, non-linear, o
Publicado em: 2008
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22. Semicontinuidade superior de atratores para semigrupos multívocos.
In this work we developed an abstract theory for existence and characterization of attractors for multivalued semigroups defined by generalized semi ows and we apply the abstract results to systems of p-laplacian differential inclusions and we obtain upper semicontinuity of the attractors as the parameter of diffusion goes to infinity.
Publicado em: 2007
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23. 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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24. Analysis of turbulent signals in the canopy of the Amazon forest: in search of chaotic behavior and coherent structures / Análise de sinais turbulentos na copa da floresta Amazônica: em busca de comportamento caótico e estruturas coerentes
Neste trabalho é analisada a possível natureza caótica da turbulência atmosférica. As análises aqui realizadas, baseadas em dados de temperatura de alta resolução, obtidos pela campanha WETAMC do projeto LBA, sugerem a existência de um comportamento caótico de baixa dimensão na camada limite atmosférica.O atrator caótico corespondente posui uma
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 31/08/2006