The results will present references to build up the model for population system administration.
为建立该虫的种群系统管理模型提供了依据。
参考来源 - 脊胸露尾甲对主要生态因素的反应及其与黄斑露尾甲种间竞争的研究This study was based on the theory of Pest Population System Control (PPSC). Twenty kinds of extracts of tropical plant were evaluated by the Life Table Method and the Index of Interference of Population Control (IIPC).
本论文在害虫种群系统控制理论的指导下，运用生命表方法和害虫种群干扰控制指数，综合评价了20种热带植物提取物对小菜蛾Plutella xylotella L．种群的控制作用。
参考来源 - 热带植物次生物质对小菜蛾种群的控制作用·2,447,543篇论文数据，部分数据来源于NoteExpress
The population system is a dynamical system.
人口是一个动态系统。
The optimal harvesting problem for a semi-linear age-dependent time-varying population system is discussed.
讨论了年龄相关的半线性时变种群系统的最优捕获控制问题。
In this paper, the existence of the optimal harvesting control for a class of non-linear population system is proved.
研究了一类半线性时变种群扩散系统的最优收获问题，证明了最优收获控制的存在性。
" ...such as relatively low levels of malaria risk to start with, political stability, a good health system and low levels of population movement bringing in infections from elsewhere."
VOA: special.2010.11.03
Rising costs and an aging population also put extra demand on the system,and this worries health providers, says Kersting.
VOA: standard.2009.09.28
Like over 85 percent of the population, the Geyersbach family is insured under Germany's public health system.
VOA: standard.2009.09.28
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