In this paper, a discrete stage-structured epidemical model is proposed and studied.
本文主要讨论了离散的阶段结构传染病模型。
We investigate the dynamic behaviors of a stage-structured pest population model with birth pulse and impulsive spraying pesticide at fixed time.
研究了一个具有阶段结构，脉冲生育及在固定时刻对其喷洒杀虫剂的害虫种群模型的动力学性质。
This paper studied the effect of prey refuges on the stage-structured predator-prey model with two life stages-immature and mature, and with a mature prey using refuges.
构造了一个具有阶段结构的捕食—食饵模型，并研究了庇护所效应对于该系统平衡点的稳定性、平衡密度及其种群长期续存的影响。
The compilation of railway container transfer loading plan is a semi structured question and multi stage(two stage)decision question .
编制铁路集装箱中转配装计划是一个半结构化多阶段（二阶段）决策问题。
At the stage of advanced study, learners need to face a lot of ill-structured problems that often lack systematicness and often don t have certain ans.
在高级学习阶段，学习者需要面对大量结构不良领域的问题，这些问题经常没有确定的规则和答案。
Systematic research method was mainly used: Firstly, researches in the paper were based on ideas of SE. Secondly, structured process models of different design stage were established.
本文针对产品系统化设计若干关键理论问题开展研究，是对基于系统工程的产品综合设计理论与方法的继承性研究。
Systematic research method was mainly used: Firstly, researches in the paper were based on ideas of SE. Secondly, structured process models of different design stage were established.
本文针对产品系统化设计若干关键理论问题开展研究，是对基于系统工程的产品综合设计理论与方法的继承性研究。
应用推荐