Break-even concentration and periodic behavior of a stochastic chemostat model with seasonal fluctuation

Break-even concentration and periodic behavior of a stochastic chemostat model with seasonal fluctuation
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具有季节性波动的随机恒化器模型的盈亏平衡浓度和周期性行为

DOI:
10.1016/j.cnsns.2016.10.014
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发表时间:
2017-05
影响因子:
3.9
通讯作者:
Yuan, Sanling
Yuan, Sanling
中科院分区:
数学2区
文献类型:
--
作者:
Zhao, Dianli;Yuan, Sanling

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本文建立了一个具有周期系数的单种群随机恒化器模型。当噪声小时,确定修改的盈亏平衡浓度,其值低于或高于输入营养物的平均浓度可以完全确定微生物是否会持续存在,其中给出灭绝的准确衰减率。在持续生存的情况下,证明了所考虑的模型的随机正周期解的存在性。在适当的条件下,证明了随机周期解的全局吸引性。本文所得到的周期动力学的计算机模拟支持。
This paper formulates a single-species stochastic chemostat model with periodic coefficients due to seasonal fluctuation. When the noise is small, a modified break-even concentration is identified, whose value below or above the averaged concentration of the input nutrient can completely determine whether the microorganism will persist or not, where an accuracy decay rate is given for extinction. In case of persistence, existence of the random positive periodic solution is proved for the considered model. Further, the random periodic solution is shown to be globally attractive under some mild extra condition. The periodic dynamics obtained in this paper are supported by computer simulations.
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