Periodic Solutions
Mostrando 13-24 de 67 artigos, teses e dissertações.
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13. Periodic boundary value problems for impulsive neutral differential equations with multi-deviation arguments
We develop the impulsive inequality and the classical lower and upper solutions, and establish the comparison principles. By using these results and the monotone iterative technique, we obtain the existence of solutions of periodic boundary value problems for a class of impulsive neutral differential equations with multi-deviation arguments. An example is gi
Computational & Applied Mathematics. Publicado em: 2010
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14. Analysis of an impulsive pest management SEI model with nonlinear incidence rate
According to biological strategy for pest control, we investigate the dynamic behavior of a pest management SEI model with nonlinear incidence concerning impulsive strategy-periodic releasing infected pests at fixed times. We prove that all solutions of the system are uniformly ultimately bounded and there exists a globally asymptotically attractive pest-era
Computational & Applied Mathematics. Publicado em: 2010
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15. Influence of asymptomatic pneumonia on the response to hemorrhage and resuscitation in swine
INTRODUCTION: Investigation of resuscitation fluids in our swine hemorrhage model revealed moderate to severe chronic pneumonia in five swine at necropsy. Our veterinary staff suggested that we perform a retrospective analysis of prospectively collected data from these animals. We compared the data to that of ten healthy swine to determine the physiologic co
Clinics. Publicado em: 2010
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16. Estudo da estabilidade secundária da esteira de um cilindro em oscilação forçada. / Study of secondary stability of the wake of a circular cylinder undergoing forced oscilation.
This thesis presents the investigation of the transition to a three-dimensional flow in the wake of an oscillating circular cylinder. This is the secondary transition of the flow around a circular cylinder, while the primary transition leads to the von Kármán wake. The investigative work is performed in the Reynolds number (Re) range which occurs the secon
Publicado em: 2010
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17. Existencia e estabilidade de ondas viajantes periodicas para alguns modelos dispersivos / Existence and stability of periodic travelling waves for some dispersive models
The goal of this thesis is to study the properties of solutions of some dispersive differential equations. First, we develop a local and global well-posedness theory for the regularized Benjamin-Ono equation in the periodic setting, then, we show that the Cauchy problem for this equation (in both periodic and nonperiodic cases) cannot be solved by an iterati
Publicado em: 2009
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18. Periodic solutions for nonlinear telegraph equationvia elliptic regularization
In this work we are concerned with the existence and uniqueness of T -periodic weak solutions for an initial-boundary value problem associated with nonlinear telegraph equations typein a domain . Our arguments rely on elliptic regularization technics, tools from classic
Computational & Applied Mathematics. Publicado em: 2009
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19. New approach for tanh and extended-tanh methods with applications on Hirota-Satsuma equations
In this work, we establish new exact solutions for the Hirota-Satsuma equations. New approach for the tanh is used and extended tanh methods to construct traveling wave solutions in terms of a hyperbolic tangent functions. New families of solitary wave solutions and periodic solutions are also obtained for Hirota-Satsuma equations. Our approach is reduce the
Computational & Applied Mathematics. Publicado em: 2009
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20. Funções s-assintoticamente periódicas em espaços de Banach e aplicações à equações diferenciais funcionais / S-asymptotically periodic functions on Banach spaces and applications for functional differential equations
This work is devoted to the study of the class of continuous and bounded functions f : [0 INFINIT) ARROWX for which there exists omega>0 such that limt IND.t ARROWINFINIT(f(t + omega!) - f(t)) = 0 (in the sequel called S-asymptotically !-periodic functions). We discuss qualitative properties and establish some relationships between this type of functions and
Publicado em: 2009
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21. Perturbations of reversible systems / Perturbações de sistemas reversiveis
In this work we study the existence and persistence of some minimal sets in perturbations of reversible systems. First we make non reversible perturbations of centers in R2 and R4 and we detect conditions for the existence of limit cycles and invariant tori. We study the existence of periodic solutions of the perturbations of a family of di_erential equation
Publicado em: 2009
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22. On analytic singularities of a class of vector fields on the torus / Sobre singularidades analíticas de soluções de uma classe de campos vetoriais no Toro
O objetivo principal deste trabalho é o estudo da regularidade anallítica global de certos operadores diferenciais definidos no toro. Uma ferramenta fundamental utilizada neste estudo são as séries parciais de Fourier, que nos permitem caracterizar tanto as distribuições periódicas quanto as funções anallíticas reais periódicas através do comport
Publicado em: 2009
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23. Filtros acústicos em cristais fonônicos
In this work, we have studied the acoustic phonon wave propagation within the periodic and quasiperiodic superlattices of Fibonacci type. These structures are formed by phononic crystals, whose periodicity allows the raise of regions known as stop bands, which prevent the phonon propagation throughout the structure for specific frequency values. This p
Publicado em: 2009
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24. Comportamento assintótico para soluções de certas equações diferenciais funcionais periódicas / Asymptotic behavior of solutions to certain periodic functional differential equations
We are interested in the study of the asymptotic behavior of the solutions of a class of linear autonomous Functional Differential Equations (FDE) of neutral type, where the coeficients of the non neutral part are periodic functions with common period w and the time delays are multiples of w. We employ the spectral theory for linear operators applied to the
Publicado em: 2008