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In this work, we study the long time behavior of reaction-diffusion models arising from mathematical biology. First, we study a reaction-diffusion population model with time delay. We establish a comparison principle for coupled upper/lower solutions, prove the existence/uniqueness result for the model, and show the global asymptotic behavior of the model by constructing successive improved upper/lower solutions. Next, we consider a reaction-diffusion equation with continuous delay and spatial variable coefficients. We prove the global attractivity of the positive steady state by showing that the omega limit set is a singleton. Finally, we study an SIS reaction-diffusion model with spatial heterogeneous disease transmission and recovery rates. We define a basic reproduction number and obtain some existence and non-existence results of the endemic equilibrium of the model. We then study the global attractivity of the steady state for two special cases.
Advisor: | Deng, Keng |
Commitee: | Ackleh, Azmy, Ng, Ping Wong |
School: | University of Louisiana at Lafayette |
Department: | Sciences |
School Location: | United States -- Louisiana |
Source: | DAI-B 77/06(E), Dissertation Abstracts International |
Source Type: | DISSERTATION |
Subjects: | Mathematics |
Keywords: | Asymptotic behavior, Population models, Reaction-diffusion equations |
Publication Number: | 10002390 |
ISBN: | 978-1-339-41900-8 |