Nonlinear Hyperbolic Equations
Mostrando 1-12 de 13 artigos, teses e dissertações.
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1. Modelagem e simulação da propagação de ondas em barras não homogêneas envolvendo materiais elásticos não lineares. / Numerical simulation of the dynamical response of a nonlinear elástic rod composed by two materials.
O objetivo deste trabalho é tratar da simulação do fenômeno de propagação de ondas em uma haste heterogênea elástico, composta por dois materiais distintos (um linear e um não-linear), cada um deles com a sua própria velocidade de propagação da onda. Na interface entre estes materiais existe uma descontinuidade, um choque estacionário, devido ao
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 24/08/2012
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2. Resolution of numerical hyperbolic partial differential equations nonlinear: a study aiming at recovery at oil / Resolução numérica de equações diferenciais parciais hiperbólicas não lineares: um estudo visando a recuperação de petróleo
O processo de recuperação secundária de petróleo é comumente realizado com a injeção de água no reservatório a fim de manter a pressão necessária para sua extração. Para que o investimento seja viável, os gastos com a extração têm de ser menores do que o retorno financeiro obtido com o petróleo. Para tanto, tornam-se extremamente importante
Publicado em: 2010
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3. Riemann Problems for a Symmetrical System of Two Conservation Laws / Problemas de Riemann para um Sistema Simétrico de Duas Leis de Conservação
In this dissertation we describe the solutions to the Riemann problem for a system of two conservation laws written in the normal from according to classification of Schaeffer-Shearer in [9]. Through changes of variables Schaeffer-Shearer determined the normal form for a nonlinear system of two conservation laws with an isolated umbilical point in state spac
Publicado em: 2010
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4. 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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5. Dispersionless limit of integrable models
Nonlinear dispersionless equations arise as the dispersionless limit of well know integrable hierarchies of equations or by construction, such as the system of hydrodynamic type. Some of these equations are integrable in the Hamiltonian sense and appear in the study of topological minimal models. In the first part of the review, we will give a brief introduc
Brazilian Journal of Physics. Publicado em: 2000-06
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6. NON LINEAR ANALYSIS OF EXCAVATIONS AND EMBANKMENTS / ANÁLISE NÃO LINEAR DE ESCAVAÇÕES E ATERROS
The main objective of this thesis consists on the development and application of a computational program, ANLOG (Non Linear Analysis of Geotechnical Constructions), to analyse geotechnical problems coupling flow and deformation, and considering constitutive non-linear relations for the soil modelling.At the global level, the solution of the non linear system
Publicado em: 1998
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7. NUMERICAL MODEL FOR A SIMULATION OF VISCOELASTIC FLUIDS VIA FINITE ELEMENTS / UM MODELO NUMÉRICO PARA A SIMULAÇÃO DO ESCOAMENTO DE FLUIDOS VISCOELÁSTICOS VIA ELEMENTOS FINITOS
A new numerical scheme has been introduced for viscoelastic fluid flows. First, it was studied the viscoelastic behavior with particular emphasis on equations in wich the extra stress tensor is not explicity dependent of the velocity field. Two of the most difficult to solve constitutive models have been considered, the Maxwell-B and Oldroyd-B. The numerical
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 02/02/1993
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8. Esquemas de alta resolução para controle da dispersão numerica em simulação de reservatorios
Standard finite-diference reservoir simulation normally uses single-point upstream welghting to approximate the components of the convective flow term at the interfaces between blocks. This procedure stabilizes the numerical solution, but introduces high levels of numerical dispersion, difficulting the correct interpretation of the simulated results. Exponen
Publicado em: 1991
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9. Delayed singularity formation for solutions of nonlinear partial differential equations in higher dimensions
Strict solutions u of genuinely nonlinear homogeneous hyperbolic equations in two independent variables with initial data f(x) of compact support become singular after a time interval of order ∥f∥-1. In higher dimensions solutions initially of compact support are likely to have life expectancies of orders ∥f∥-2+ε at least. This is proved for the spe
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10. Systems of Conservation Equations with a Convex Extension
We discuss first-order systems of nonlinear conservation laws which have as a consequence an additional conservation law. We show that if the additional conserved quantity is a convex function of the original ones, the original system can be put into symmetric hyperbolic form. Next we derive an entropy inequality, which has also been suggested by I. Kružhko
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11. Thermal Inactivation of Aeromonas hydrophila As Affected by Sodium Chloride and Ascorbic Acid
The combined effects of sodium chloride (0, 1.0, 1.5, and 3.0%) and ascorbic acid (0, 1.0, and 2.0 mmol/liter) with mild heat (46°C) on the survival of Aeromonas hydrophila were evaluated. Because of the nonlinear nature of the survivor curves obtained, several equations yielding an R2 (coefficient of multiple determination) of ≅ 1 were tested. The equati
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12. Stochastic focusing: Fluctuation-enhanced sensitivity of intracellular regulation
Many regulatory molecules are present in low copy numbers per cell so that significant random fluctuations emerge spontaneously. Because cell viability depends on precise regulation of key events, such signal noise has been thought to impose a threat that cells must carefully eliminate. However, the precision of control is also greatly affected by the regula
The National Academy of Sciences.