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arXiv 0812.1367math.AP
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层次大小结构总体:线性化半群方法

Hierarchical size-structured populations: The linearized semigroup approach

Jozsef Z. Farkas, Thomas C. Hagen

摘要:

在本文中,我们分析了一个层次规模结构的人口模型的线性稳定性,其中的生命率(死亡率,生育率和增长率)既取决于规模和人口密度(“环境”)的一般功能。我们推导出的统治线性半群的正则性,这意味着线性稳定性是由一个占主导地位的实特征值的半群生成器,这是作为一个零的相关特征函数。在增长率和死亡率都不依赖于环境的特殊情况下,我们显式地计算了特征函数,并用它来表示种群平衡点线性稳定的简单条件。在一般情况下,我们推导出的线性半群的耗散性条件,从而表征指数稳定的稳定状态。

英文摘要:

In the present paper we analyze the linear stability of a hierarchical size-structured population model where the vital rates (mortality, fertility and growth rate) depend both on size and a general functional of the population density ("environment"). We derive regularity properties of the governing linear semigroup, implying that linear stability is governed by a dominant real eigenvalue of the semigroup generator, which arises as a zero of an associated characteristic function. In the special case where neither the growth rate nor the mortality depend on the environment, we explicitly calculate the characteristic function and use it to formulate simple conditions for the linear stability of population equilibria. In the general case we derive a dissipativity condition for the linear semigroup, thereby characterizing exponential stability of the steady state.

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。

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