Pulsating semi-waves in periodic media and spreading speed determined by a free boundary model

Pulsating semi-waves in periodic media and spreading speed determined by a free boundary model
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周期介质中的脉动半波和自由边界模型确定的传播速度

DOI:
10.1016/j.anihpc.2013.11.004
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发表时间:
2015-03
期刊:
Annales de l'Institut Henri Poincare (C) Non Linear Analysis
影响因子:
--
通讯作者:
Liang,Xing
Liang,Xing
中科院分区:
其他
文献类型:
--
作者:
Du,Yihong;Liang,Xing

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考虑一类带Logistic非线性项的径向对称自由边界问题。假设空间环境在径向无穷远处是渐近周期的。对于这样的自由边界问题,从文献[7]可知,扩散-消失二分法成立。然而,当发生扩展时,文[7]中只得到了渐近扩展速度的上下界。本文研究了空间周期介质中的一维脉动半波。我们证明了这种脉动半波的存在唯一性,并证明了自由边界问题的渐近传播速度与相应的脉动半波的速度重合。
We consider a radially symmetric free boundary problem with logistic nonlinear term. The spatial environment is assumed to be asymptotically periodic at infinity in the radial direction. For such a free boundary problem, it is known from [7] that a spreading-vanishing dichotomy holds. However, when spreading occurs, only upper and lower bounds are obtained in [7] for the asymptotic spreading speed. In this paper, we investigate one-dimensional pulsating semi-waves in spatially periodic media. We prove existence, uniqueness of such pulsating semi-waves, and show that the asymptotic spreading speed of the free boundary problem coincides with the speed of the corresponding pulsating semi-wave.
具有自由边界的扩散逻辑模型中的扩散-消失二分法,II
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