arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2007.15441math.AP
收藏

具有非局部扩散的传染病模型的空间传播:初始数据和扩散的影响

Spatial Propagation in an Epidemic Model with Nonlocal Diffusion: the Influences of Initial Data and Dispersals

Wen-Bing Xu, Wan-Tong Li, Shigui Ruan

摘要:

研究了一类具有非局部扩散的传染病模型。我们重点研究了初始数据和非局部扩散对其空间传播的影响。这里的初始数据代表了传染病爆发时病原体和传染人群的空间浓度,而非局部扩散则代表了它们的扩散策略。两种类型的初始数据衰减到零指数或更快。对于第一类,我们证明了扩散速度是两个常数,其符号随集合中元素的数目而变化。此外,我们还发现了一个有趣的现象:非局部扩散的不对称性会影响解的传播方向和定态的稳定性。对于第二种类型,我们表明,传播速度是下降的指数衰减率的初始数据,并进一步,其最小值与第一种类型的传播速度相一致。此外,我们还给出了行波解的不存在性和解的单调性的一些结果。最后给出了一些应用实例来说明理论结果。

英文摘要:

This paper studies an epidemic model with nonlocal dispersals. We focus on the influences of initial data and nonlocal dispersals on its spatial propagation. Here the initial data stand for the spatial concentrations of infectious agent and infectious human population when the epidemic breaks out and the nonlocal dispersals mean their diffusion strategies. Two types of initial data decaying to zero exponentially or faster are considered. For the first type, we show that the spreading speeds are two constants whose signs change with the number of elements in some set. Moreover, we find an interesting phenomenon: the asymmetry of nonlocal dispersals can influence the propagating directions of solutions and the stability of steady states. For the second type, we show that the spreading speed is decreasing with respect to the exponentially decaying rate of initial data, and further, its minimum value coincides with the spreading speed for the first type. In addition, we give some results about the nonexistence of traveling wave solutions and the monotone property of solutions. Finally, some applications are presented to illustrate the theoretical results.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑