Periodic Solution
Mostrando 25-36 de 81 artigos, teses e dissertações.
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25. Modelagem multiescala do acoplamento eletro-químico em um meio poroso argiloso com dependência do PH / Multiscale modeling of eletro-chemical couplings in clays including PH dependence
In this work we develop a three-scale mathematical modeling to describe electro-chemical couplings in clays using the asymptotic homogenization procedure of periodic structures. We consider the porous medium composed of kaolinite particles saturated by an electrolyte solution of water-solvent and four ionic solutes monovalents Na+, H+, Cl-, OH-At the nanosca
Publicado em: 2007
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26. Fuzzy modelling for trajectory fixation in chaotic systems. / Modelagem fuzzy para fixação de trajetórias em sistemas caóticos.
A mapping of analytical tools for representation and computational treatment of Fuzzy Systems was made in this thesis. This mapping evidenced the existence of relations and the adequacy of the use of the Fuzzy Theory in the models construction for the problems solution involving dynamic systems e, in particular, of chaotic systems. A differentiation was cons
Publicado em: 2007
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27. Computer based model for the heating of a single phase induction motor applied on washing machine during agitation task / Modelagem computacional do aquecimento de um motor de indução monofasico aplicado em maquinas de lavar roupas durante a etapa de agitação
This study motivation was finding a computer-based model that was able to foresee if the duty cycle applied in a single-phase induction motor implies or not in an overheating that can compromise the motor insulation. The solution presented here is based on finding a difference equation in which the system output (motor temperature at time k+1) is calculated
Publicado em: 2007
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28. Desenvolvimento de um sistema de apoio à decisão para a elaboração da escala periódica de pessoal de enfermagem / Development of a decision support system to the elaboration of the periodical Schedule of the Nursing staff
The software of automatic generation of the periodic work schedule of the nursing professionals is presented on this work. This software has the shape of an Intranet, what facilitates the system implementation and makes the installation of client softwares of the data bank or any other type of configuration at the users´ computers unnecessary. Another relev
Publicado em: 2007
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29. AvaliaÃÃo da atividade terapÃutica do Melxi em modelo animal de doenÃa inflamatÃria do trato respiratÃrio
Melxi is a phytotherapeutic product made from bee honey and pineapple extract (Ananas comosus L.). Honey has anti-septic and bactericidal properties, and consists of 78% carbohydrates, 1.5% proteins and 0.18% mineral salts, besides 5.72% vitamins and other elements. The raw extract of pineapple contains a complex mixture of proteases, called bromelain, in
Publicado em: 2007
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30. Applied nonlinear dynamics of non-smooth mechanical systems
This paper introduces practically important concept of local non-smoothness where any dynamical system can be considered as smooth in a finite size subspace of global hyperspaceomega. Global solution is generated by matching local solutions obtained by standard methods. If the dynamical system is linear in all subspaces then an implicit global analytical sol
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2006-12
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31. Analiticidade, na variável espacial, da solução do problema de Caucky para a equação de KdV.
In this work we use bilinear estimates and point fix theorem to show that the solution to the initial value problem for the Korteweg-de Vries equation with analytic periodic initial data is analytic and periodic in the space variable.
Publicado em: 2006
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32. Um estudo algorítmico de problemas logísticos na indústria de petróleo e gás natural / An algorithmic study of logistic problems on petroleum and natural gas industry
This work consists on the study of two important problems arising from the operations of petroleum and natural gas industries. The first problem the pipe dimensioning problem on constrained gas distribution networks consists in finding the least cost combination of diameters from a discrete set of commercially available ones for the pipes of a given gas netw
Publicado em: 2006
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33. Application of artificial intelligence techniques for dynamic channel allocation on wireless networks. / Aplicação de técnicas de inteligência artificial na alocação dinâmica de canais em redes sem fio.
In the last years, mobile networks became more important for communication systems infrastructure. One area of great growth is mobile computation, which is performed through radio signals. The amount of available channels rarely is enough to attend the increasing demand. This work presents a solution for the channel allocation topic, a challenging topic in
Publicado em: 2006
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34. Controle da Resposta Dinâmica de um Passarela de Pedestres da Cidade de Brasília com a Utilização de Amortecedores de Massa Sintonizados / Vibration control of a footbridge in the city of Brasilia using multiple tuned mass dampers (AMSM)
Advanced constructive technologies and the use of high resistance materials made possible the design of slender and flexible structures, which present less strength and damping. These structures are more sensitive to vibrations in low frequencies, characteristic of footbridges. The loads produced by human movements, mathematically represented by periodic fun
Publicado em: 2006
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35. The sinusoid as the longitudinal profile in backward-wave oscillators of large cross sectional area
High-power generation in backward-wave oscillators (BWO) of large section requires that the beam electrons flowing close to the corrugated wall interact efficiently with surface waves supported by a periodic structure. Such waves are described by the superposition of slow-wave space harmonics of the operating mode. The present paper reports on design tools f
Brazilian Journal of Physics. Publicado em: 2004-12
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36. PHYSICS OF STRONGLY CORRELATED AND DISORDERED SYSTEMS / FÍSICA DE SISTEMAS FORTEMENTE CORRELACIONADOS E DESORDENADOS
In this thesis we study the properties of strongly correlated and disordered materials, using model Hamiltonians to describe them. The thesis is divided in two parts. The first one studies the periodic Anderson model used to describe the properties of a Kondo insulator. In particular we take Ce3Bi4Pt3 as a paradigmatic compound, characterized by a small gap(
Publicado em: 2004