Periodic Solution
Mostrando 13-24 de 81 artigos, teses e dissertações.
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13. Dynamical behavior of a pest management model with impulsive effect and nonlinear incidence rate
In this paper, we consider the pest management model with spraying microbial pesticide and releasing the infected pests, and the infected pests have the function similar to the microbial pesticide and can infect the healthy pests, further weaken or disable their prey function till death. By using the Floquet theory for impulsive differential equations, we sh
Computational & Applied Mathematics. Publicado em: 2011
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14. Efeitos causados pela modulação de parâmetros no mapa de hénon / Effects caused by the parameters modulation in the hénon map
The Hénon map is a paradigmatic two-dimensional discrete-time dynamical system, which was originally proposed as a model to the Poincaré section of the continuous-time Lorenz system, and has been extensively investigated in the last years. Apart from its theoretical importance, some practical applications are possible. As an example, it can be used to mode
Publicado em: 2011
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15. 2(5H)-Furanone: a prospective strategy for biofouling-control in membrane biofilm bacteria by quorum sensing inhibition
Biofouling of membranes demands costly periodic cleaning and membrane replacement. A sustainable and environmentally friendly solution for maintenance is not available and would be of great interest for many purposes including economical. As complex biofilm formation by environmental strains is the major cause of biofouling and biofilm formation in most case
Brazilian Journal of Microbiology. Publicado em: 2010-03
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16. 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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17. Uma teoria de regularidade para certas equaÃÃes de evoluÃÃo em escala de tempo discreto e contÃnuo
Nesta tese estudamos trÃs tipos de equaÃÃo de evoluÃÃo. Para a equaÃÃo do Oscilador HarmÃnico semilinear discreto desenvolvemos uma teoria de perturbaÃÃo e apresentamos um resultado de estabilidade de sua soluÃÃo. Para isso, utilizamos uma caracterizaÃÃo de regularidade maximal discreta via espaÃos UMD. Estudamos tambÃm a S-assintoticidade
Publicado em: 2009
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18. Structural and metabolic reorganization of the gut during the fasting and seasonal dormancy in tegu lizards Tupinambis merianae / Reorganização estrutural e metabólica do intestino associada ao jejum e dormência sazonal em lagartos teiú Tupinambis merianae
The gut phenotypic plasticity is widely documented in the vertebrates and would allow to either short term or anticipatory adjustments in the organ functional capacity, to cope with unpredictable and periodic changes of food availability in the environment. This study investigates seasonal changes of morphology and in the capacity for substrate oxidation in
Publicado em: 2009
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19. Ovary maturatıon stages and histological investigation of ovary of the Zebrafish (Danio rerio)
Microscopic ovary features of Zebrafish were analyzed. Samples were fixed in Bouin’s solution, mounted in parafin and cut into 6-7 µm-thick slices which were stained with Hematoxylin and Eosin (HE), methylene blue and using Periodic-acid Schiff method (PAS). The thin sections in ultramicrotome with the thickness of approximately 0,5 - 0,7 µm were examine
Brazilian Archives of Biology and Technology. Publicado em: 2008-06
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20. SoluÃÃes exatas para arranjos periÃdicos de bolhas na cÃlula de Helen-Shaw
In this thesis exact solutions for the problem of multiple bubbles in a Hele-Shaw cell are presented for the case when surface tension effects are neglected. The solutions reported here describe a doubly-periodic array of bubbles that move with constant velocity in the x direction. In a reference frame that moves with the bubbles, the bubble centroids are lo
Publicado em: 2008
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21. 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
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22. OtimizaÃÃo multiobjetivo da confiabilidade via sistemas multiagentes baseado em colÃnia de formigas
This dissertation presents the modeling, implementation and results of a multiagent system based on ant colony metaheuristic to solve multiobjectve problems on reliability engineering area. We will consider redundancy allocation and periodic tests policy problems. High reliability and low associated costs are objectives of all systems projects. Meanwhile, in
Publicado em: 2008
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23. Projeto e fabricação de nao-estruturas por litografa interferometrica / Design and fabrication of nano-structures by interforometric lithography
In this work the interferometric lithography technique was developed for recording periodic relief nano-structures, one and bi-dimensional, on silicon and glass substrates. In particular, the work is focused in two directions: the study of the profile of the structures recorded in photorresist, through the superimposition of interference light patterns, and
Publicado em: 2008
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24. Bifurcação de Hopf generalizada para um sistema planar suave por partes
In this work we use the qualitative theory of the di?erential equations to quickly study the Hopf bifurcation for a smooth planar dynamical system under the variation of the control parameter of the system, and a generalized Hopf bifurcation emanated from a corner for piecewise smooth planar dynamical system, about the generation of a branch of periodic orbi
Publicado em: 2007