空间异质的非局部扩散SI传染病模型的动力学

Dynamics of a spatially heterogeneous SI epidemic model with nonlocal diffusion

研究了具有标准发生率的空间异质性非局部扩散SI传染病模型。利用下一代算子的谱半径方法计算了系统的基本再生数R0,借助Lyapunov函数证明了R_(0)<1时无病稳态解的全局渐近稳定性;当易感者的扩散率D_(S)=0且R_(0)>1时,利用上、下解等方法证明了系统地方病稳态解的存在性、唯一性与全局渐近稳定性。

We study a spatially heterogeneous non-local dispersal SI epidemic model with the standard incidence.The basic reproduction number R0of the system is defined as the spectral radius of the next generation operator,and by means of suitable Lyapunov functional,the global asymptotic stability of the disease-free equilibrium is proved when R0<1;the upper and lower solutions are used to prove the existence,uniqueness and global asymptotic stability of the endemic equilibrium of the system when the dispersal rate DS=0 of susceptible individuals and R0>1.