Microsoft Word - 徐志兰.DOC 关键词:年龄结构;人口动力学;最优控制;种群模型; [gap=10121]Key Words: Age-structure; Population dynamics; Optimal control; Population model
基于18个网页-相关网页
age structure [统计] 年龄结构 ; [统计] 年龄构成 ; 年龄分布
age structure of population 种群的年龄结构 ; 人口年龄结构 ; 人口年龄构成
Population age structure 种群年龄组成 ; 人口年龄结构
age structure model [统计] 年龄结构模型
Adjusting The Age Structure 调整从结构
age-structure fish population systems 年龄结构鱼群系统
me age structure 信息结构
Age structure report 年龄结构
the age structure 年龄结构
The age-structure is similar with the DBH-class distribution and high-class distribution for three species.
3物种的种群年龄结构与胸径级结构、高度级结构相吻合。
参考来源 - 天童常绿阔叶林米槠—木荷群落历史动态及干扰事件的重建In chapter two, we establish a kind of new class age-structure SEIR epidemic model with impulsive vaccination and nonlinear infectivity, which contains ODEs and PDEs at the same time.
第二章,建立了一类新的带有脉冲接种的类年龄结构SEIR流行病模型,并考虑其具有非线性传染率。 该模型既含有常微分方程,又含有偏微分方程。
参考来源 - 传染病模型和脉冲微分系统的动力学研究·2,447,543篇论文数据,部分数据来源于NoteExpress
But there is no evidence to show that the structure of eyes is changed by wearing glasses at a young age.
但是没有证据表明在年轻的时候戴眼镜会改变眼睛的结构。
Such a policy distorts the age structure: the proportion of population in the younger age groups goes down and proportion of the elderly increases.
这样一项政策改变了年龄结构:年轻人的人口比例下降,而老年人的比例增长。
From age structure, the main forces of the divorce group aged from22 to 35; the stable period of marriage is between 36 and 50; after 50, divorce rate surges again.
从年龄结构看,22 ~ 35岁人群是离婚主力军,36 ~ 50岁年龄段是婚姻平稳期,50岁以上人群离婚率上扬。
应用推荐