Parabolic Equation
Mostrando 1-12 de 24 artigos, teses e dissertações.
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1. Ray Tracing and Applications to an Evaporation Duct Model Based on Data from Oceanographic Buoy Sensors
Abstract The two-dimensional ray tracing method allows an easy and fast modeling of tropospheric propagation in the microwave frequency range. A version of this method that determines ray trajectories, amplitudes and delays of the electromagnetic field, as well as the propagation loss in a two-dimensional inhomogeneous environment will be described. The impl
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2019-03
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2. Free vibration analysis of orthtropic thin cylindrical shells with variable thickness by using spline functions
In this study, vibration behavior of orthotropic cylindrical shells with variable thickness is investigated. Based on linear shell theory and applying energy method and using spline functions, free vibration relations are derived for shell with variable thickness and curvature. Frequency parameter and mode shapes are found after solving the frequency Eigenva
Lat. Am. j. solids struct.. Publicado em: 2014
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3. Free vibration and dynamic response analysis of stiffened parabolic shells using equivalent orthotropic shell parameters
Dynamic response and free vibration analysis of stiffened shells having parabolic curvatures, with applications to ships and other similar structures are the main focus of this study. The energy approach is employed to the determination of equivalent orthotropic shell parameters of parabolic stiffened shells. The unstiffened equivalent shell has proper accur
Lat. Am. j. solids struct.. Publicado em: 2013-07
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4. Solution of hyperbolic bioheat transfer problems by numerical green's functions: the ExGA-linear θ method
This paper presents a time-domain formulation called Explicit Green's approach (ExGA) linear θ method for the solution of the bioheat equation. Starting from the hyperbolic bioheat equation, which includes the parabolic one as a special case, the linear method is incorporated into the standard ExGA time marching scheme. The numerical Green's function is fir
J. Braz. Soc. Mech. Sci. & Eng.. Publicado em: 2012-12
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5. Taxa de convergência de atratores de algumas equações de reação-difusão perturbadas. / Rate of convergence of attractors de some reaction-difusion equations pertubadas
In this work we study the asymptotic nonlinear dynamical of some reaction-diffusion parabolic equations under perturbations in parameter and singular perturbations in a dumbbell domain. More precisely, we treat of the attractors from these problems, we seek understand the dependence these asymptotic set of states in relationship the parameter, investigating
Publicado em: 2010
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6. A posteriori error estimate for the contaminant transport equation in small advection regime / Um estimador de erro a posteriori para a equação do transporte de contaminantes em regime de pequena advecção
Vários modelos computacionais que implementam o transporte de soluto em meio poroso saturado surgem constantemente em publicações científicas devido à suma importância dada à compreensão e previsão do transporte de constituintes dissolvidos em água subterrânea. As soluções numéricas obtidas por esquemas computacionais não estão imunes aos err
Publicado em: 2010
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7. Theoretical observational study and numerical of soil temperature in Maceió -AL / Estudo observacional teórico e numérico da temperatura do solo em Maceió-AL.
The solution of a differential parcial parabolic equation of the Heat Flow on the Soil allows to simulate temperatures along a specific profile. For that, it is necessary to work with the soil analytical solution, but this solution is too complex for certain field situation. For this reason one of the methods of working soil temperature simulation are the ca
Publicado em: 2009
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8. SoluÃÃes globais e nÃo - globais de uma equaÃÃo parabÃlica nÃo - linear
We study the behaviour of solutions for the nonlinear heat equation with Dirichlet boundary conditions on a bounded subset of RN. We introduce the notion of weak solutions for this type of problem, and study the relation between such solutions and weak solutions for the associated stationary elliptic problem. Basic notions on Lebesgue spaces, Sobolev spaces,
Publicado em: 2008
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9. A mathematical analysis of a model of control of mosquito populations / Analise matematica de um modelo de controle de populações de mosquitos
In this work, we consider an optimal control problem governed by a parabolic partial differential equation, which models the growth and diffusion of a mosquito population in a certain region of the Euclidean plane. For this relatively simple model, we show the existence of an optimal trajectory to be followed by a insecticide spraying device, in the sense of
Publicado em: 2008
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10. Modelagem Computacional de Ventosas de duplo efeito como mecanismo de alÃvio do Golpe de ArÃete / Computational modeling of air in-let of double effect as mechanism of relief of the waterhammer
ABSTRACT This work presents a computer simulation of the air valves of double effect in Hydraulics Transients in pipelines through the use of the computer code UFC6 developed in the Hydraulic Computational Laboratory (HCL) of the Universidade Federal do CearÃ. Air valves are devices designed to relief the effects of the water hammer phenomena throughout exp
Publicado em: 2007
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11. Uma contribuiÃÃo ao estudo da sedimentaÃÃo gravitacional em batelada
Thickeners are equipments that uses the gravitational force as separating agent of suspended solid particle in liquid chains of industrial processes. The frequent use of the settlers in chemical industries is the reason of the interest on the development of studies on the subject. The batch sedimentation is the starting point for the project of continuous in
Publicado em: 2007
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12. Effect of potential shape on the density of the impurity states in nanotube
We analyze the effect of the potential shape on the ground state energy of the off-axis neutral donor in GaAs/Ga1-xAl xAs cylindrical nanotube in the presence of the uniform magnetic field applied along the symmetry axis. To take into account the mixing of the low lying subbands we express the wave function as a product of combination of 1s and 2p x,y wave f
Brazilian Journal of Physics. Publicado em: 2006-09