Periodic solutions and spatial patterns induced by mixed delays in a diffusive spruce budworm model with Holling II predation function

Periodic solutions and spatial patterns induced by mixed delays in a diffusive spruce budworm model with Holling II predation function
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具有 Holling II 捕食函数的扩散云杉芽虫模型中混合延迟引起的周期解和空间模式

DOI:
10.1016/j.matcom.2021.09.013
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发表时间:
2022-02
影响因子:
4.6
通讯作者:
汤小松
汤小松
中科院分区:
数学3区
文献类型:
--
作者:
汤小松

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本文在齐次诺依曼边界条件下,首次提出了混合延迟和Holling II捕食函数的扩散云杉芽虫模型。然后,选择时延(离散时延或分布式时延)作为分岔参数,结合特征方程,得出该模型不仅离散时延可以引起Hopf分岔的出现,分布时延也可以引起Hopf分岔的出现。然而,据我们所知,在已知的文献中,Hopf分岔只能通过离散延迟或分布式延迟来推导。因此,本文获得的结果是新的。最后,通过数值模拟,得到周期解以及由离散时滞或分布时滞推导出的空间格局,这也说明了本文的结果。
In present article, under homogeneous Neumann boundary condition, we put forward a diffusive spruce budworm model with mixed delays and Holling II predation function firstly. Then, choosing delay (discrete delay or distributed delay) as bifurcating parameter together with characteristic equation, we derive that not only can discrete delay induce the appearance of Hopf bifurcations for this model, but also distributed delay can do it. However, to our knowledge, in the known literatures, Hopf bifurcation can only be deduced by discrete delay or distributed delay. So, the obtained results in present article are new. At last, by carrying out numerical simulations, we obtain periodic solutions and spatial patterns deduced by discrete delay or distributed delay, which illustrates the results in this article.
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