Critical result on the break-even concentration in a single-species stochastic chemostat model

Critical result on the break-even concentration in a single-species stochastic chemostat model
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单物种随机恒化器模型中盈亏平衡浓度的关键结果

DOI:
10.1016/j.jmaa.2015.09.070
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发表时间:
2016-02
影响因子:
1.3
通讯作者:
Sanling Yuan
Sanling Yuan
中科院分区:
数学3区
文献类型:
--
作者:
Dianli Zhao;Sanling Yuan

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本文确定了随机恒化器模型的盈亏平衡浓度为严格临界参数λ ε。首次证明了对于任何噪声强度σ 2> 0,λ λ 2> S0足以使微生物灭绝,从而彻底解决了文献[10]中提出的公开问题。然后,利用Feller检验,证明了当λ ε = S0时,微生物有灭绝的可能性,这在已知文献中还没有研究过.当λ λ <S0时,除了前面讨论的平均持久性外,还利用Chebyshev不等式研究了微生物的随机持久性.此外,还证明了所考虑的模型的平稳分布的存在性。最后通过数值模拟验证了所得到的结果。
In this paper, the strictly critical parameter λ˜ is identified as the break-even concentration for the stochastic chemostat model. λ˜> S 0 suffices for extinction of the microorganism for any noise intensity σ 2> 0 is proved firstly, which completely solves the open problem proposed in [10]. Then, by using the Feller test, we show that the microorganism will go extinct in probability if λ˜= S 0, which has not been studied in the known literature. When λ˜< S 0, in addition to the previously discussed persistence in mean, the stochastic persistence of the microorganism is studied by use of Chebyshev's inequality. Besides, the existence of the stationary distribution is proved for the considered model. Numerical simulations are introduced finally to support the obtained results.
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