Nonlinear Partial Differential Equations
Mostrando 25-36 de 50 artigos, teses e dissertações.
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25. Nonlocal elliptic problems p-Kirchhoff type / Problemas elipticos não-locais do tipo p-Kirchhoff
Neste trabalho usaremos algumas técnicas da Análise Funcional não-linear para estudar a existência de soluções para a seguinte classe de problemas ... Observação: O resumo na íntegra, poderá ser visualizado no texto completo na tese digital
Publicado em: 2008
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26. Singular elliptic equations and free boundary problems / Equações elipticas singulares e problemas de fronteira livre
We study the equation -D.u = X{u>O} (log u+Àf(x, u)) in a smooth bounded domain fl C JRn, with boundary conditions u = O on 8fl. We obtain existence and regularity of the maximal solution. The positivity of such a solution depends on the parameter À and on the domain fl. .If the maximal solution vanishes on a set of positive measure, then we obtain local e
Publicado em: 2008
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27. MODELOS DE DIMENSÃO REDUZIDA PARA ANÁLISE DAS OSCILAÇÕES NÃO-LINEARES E ESTABILIDADE DE CASCAS CILÍNDRICAS / LOW DIMENSIONAL MODELS FOR NONLINEAR VIBRATION ANALYSIS AND STABILITY OF CYLINDRICAL SHELLS.
The nonlinear vibrations and stability of a fluid-filled cylindrical shell is investigated using reduced order models. First, the nonlinear equations of motion of the cylindrical shell are deduced based on the expressions for the potential and kinetic energy, which are obtained using Donnell shallow shell theory. The internal fluid is considered to be irrota
Publicado em: 2008
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28. Utilização de equações diferenciais parciais para eliminação de ruídos e detecção de bordas
The edge detection of digital images is a research field that has attracted great interest from the scientific community. Their applications go from the automatic inspection and quality control of industrial piece to the diagnosis of malignancy of cancerous tumors. However, many existing edge detectors have problems related to false edge detection. In this c
Publicado em: 2008
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29. Metodologia numérica para análise de secagem de grãos em leito fixo pela primeira e segunda Lei da Termodinâmica / Numerical methodology for analyzing deep bed grain drying by first and second laws of Thermodynamics
This work presents a methodology for analyzing deep bed grain dryers by means of the first and second laws of thermodynamics. The thermodynamic modeling is a more complex extension of a literature-available thermodynamic modeling of fluidized bed dryers, which involves a system of lumped mass and energy equations. Thus, the present analysis involved a system
Publicado em: 2008
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30. Existence and stability of periodic optical solitons / Existencia e estabilidade de solitons opticos periodicos para um sistema de equações do tipo Schrodinger
In this thesis we study the following nonlinear Schrodinger type system ... Note: The complete abstract in available with the full electronic digital thesis or dissertations
Publicado em: 2007
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31. VIBRATION CONTROL OF SLENDER TOWERS WITH A PENDULUM ABSORBER / ABSORSOR PENDULAR PARA CONTROLE DE VIBRAÇÕES DE TORRES ESBELTAS
In the present work the performance of a pendulum absorber in the vibration control of tall and slender towers, caused by dynamic loads, such as, environmental loads, is studied in detail. Due to the possibility of large amplitude oscillations, the non-linearity of the pendulum is considered in the modeling of the problem. The main objective of this research
Publicado em: 2006
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32. Um sistema presa-predador com evasão mediada por feromônio de alarme / A predator-prey model with pursuit and evasion triggered by alarm pheromones
Pattern, structure and emergent collective properties are ubiquitous in systems with many units (alive or inanimated) coupled through nonlinear interactions. Within this context, the study of cooperative phenomena in population dynamics of ecological interest has attracted the attention of the mathematicians and physicists since Lotka and Volterra in the 192
Publicado em: 2006
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33. Stability of periodic travelling wave solutions for the Boussinesq and Korteweg- de Vries equations / Estabilidade de soluções ondas viajantes periodicas para as equações de Boussinesq e de Korteweg - de Vries
Not informed.
Publicado em: 2005
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34. O problema de Cauchy para a equação de Schrodinger não-linear não-local
ln this work we establish some properties of the nonlocal nonlinear Schrodinger equation (NLSNL). First of alI, we present a preliminary chapter with notations and basic theory used to establish our results; that part also seeks to facilitate the reading of this work. Soon afterwards comes the main result: local welI-posedness for the initial value problem (
Publicado em: 2005
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35. Modelagem e analise de digestores Kraft descontinuo
Global1y, the Kraft pulping process is beginning to get use of the benefits of the recent developments in the modeling area and process control. Advanced techniques of simulation and control offer tools that allow the analysis and efficient design of multivariable non-linear process, involving the optimization and the advanced control of the process. The pul
Publicado em: 2004
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36. Numerical solution of the Euler equations for representation of transonic flows over airfoils / Solução numérica das equações de Euler para representação do escoamento transônico em aerofólios
The study of aerodynamic modeling methods for the transonic flow regime is of great importance in aeronautical engineering. Major challenge on the treatment of those flows is on their nonlinear features due to compressibility effects and shock waves (appearance). Such nonlinear effects present a strong influence on aerodynamic performance, as well as they ar
Publicado em: 2003