The optimal control problem of linear population dynamic system with age-structure in periodic environment was investigated.
在周期环境下，研究一类具有年龄结构种群线性动力系统的最优控制问题。
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。
It's not just wrinkles that reveal age, changes in facial bone structure make faces look older, too, according to researchers at the University of Rochester Medical Center.
揭示人类年龄的不仅仅是皱纹。美国罗切斯特大学医学中心的研究人员发现，面部骨骼结构的变化也会让人看起来更老。
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。
Some of the important fields of this structure are the interface specification name service cache expiration age to know if the cache has to be refreshed.
这个结构中的重要字段包括接口规范名称服务缓存过期时间，这用于确认是否必须刷新缓存。
One the most notable trends that's played out during this jobless recovery has been the dramatic shift in the age structure of employment.
在这轮伴随着高失业率的经济复苏中，一种最值得关注的趋势是就业人群年龄结构的巨大变化。
At the same time of population census, the age structure of wintering common cranes had also been examined.
在进行种群数量调查的同时，还对越冬灰鹤种群的年龄结构进行了探讨。
In this paper we formulate an epidemic model with chronological age and infectious age structure.
本文根据流行病的传染过程和机理建立了具有年龄和病程结构的流行病模型。
The paper analyzes the economic effect in the light of the characteristics of the change in population age structure of Gansu province.
本文针对甘肃省人口年龄结构变动特点，分析其经济效应。
These are the new results in age structure parity progressive population operator.
这些都是年龄结构人口胎次递进算子新的结果。
In modern volleyball world it has become an important factor for match results impacted by the age structure, the difference of height and weight.
在现今世界排坛，队伍年龄结构是否合理，以及在体重、身高方面的差异，已经成为影响比赛结果的至关重要的因素。
The result shows that this behavior varies between species and within species. Moreover, the age structure is the main factor leading to the different agonistic behaviors.
结果表明两种大袋鼠格斗行为并不一致，种群内中年龄结构是导致不同格斗行为发生的主要因素。
The height structure and diameter structure of A. senticosus population relate with community environments and with its own age structure characteristics.
刺五加种群的高度结构与径级结构的变化都与群落环境以及本身的年龄结构特点有关。
In order to accurately simulate the labor age structure, this paper USES the OLG method and establishes a recursion model that relatively impairs the age changes.
为了更准确地模拟职工年龄结构的变化，本文采用OLG方法，建立年龄变化相对稳定的职工人数递推模型。
The population dynamic of Tsuga tchekiangensis in Wuyishan Nature Reserve was studied and its age structure, the life table, survival curve, mortality rate and killing power curve were analyzed.
对武夷山自然保护区南方铁杉种群动态进行了系统研究，绘制该种群的年龄结构，编制静态生命表，分析存活曲线、死亡率曲线和损失度曲线。
Applying the methodology of standardized crude rate is necessary to remove the impact of the age structure so that the standardized dependency ratio and demographic dividend can reflect the reality.
只有应用“粗率”的标准化方法，对劳动年龄人口的年龄进行标准化，消除年龄结构的影响，“标化”人口抚养比和人口红利，才更有可能反映实际。
The age structure of Chinese sports population take on a distribution of "saddle shape", which showed that the ageing population (especially the female elderly) makes an important role in it.
根据研究表明，我国体育人口年龄结构呈现“马鞍型”分布，老年人口是体育人口的重要组成部分。
The major reason for the coexistence of many types of age structure is ascribed to the differences in natural disturbance regime in each region.
不同地段自然干扰状况的差异是造成多种年龄结构类型共存的主要原因。
The age structure and educated structure of calisthenics teachers are reasonable but the professional qualify is poor in some degree.
教师队伍的年龄结构和学历结构等相对合理，但是健美操教师的专业素质相对较低。
Age structure effect — Changes in the age distribution induced by the rate of population growth.
年龄结构效应——由人口出生率引起的年龄分布变化。
The age structure, reproductive age structure, fecundity and reproductive value of Larix chinensis were studied, the reproductive fitness and the reproductive strategy were analyzed in this paper.
研究了太白红杉种群的年龄结构、生殖年龄结构、生殖力和生殖值，分析了太白红杉种群的生殖适合度和生殖对策。
The result shows that the Tree class structure replacing the age structure is suitable for studying the structure and dynamics of Castanopsis fargesii population.
结果表明，应用立木级结构代替年龄结构研究栲树种群的结构和动态特征是适用的。
Age-standardized death rate: death rate corrected so as to allow for the effects of the differences in age structure of a population.
年龄标准化死亡率：根据(一国)人口年龄结构差异的影响修正的死亡率。
The result revealed that there was obviously changed in age structure and reproduction structure of L. lagurus with the decline of the population quantity.
结果表明，随着草原兔尾鼠数量的下降，种群的年龄结构和繁殖结构都发生了明显的变化。
Then, we examine the consumption function model that includes the population age structure variables which is the population of all ages the proportion of the total population share.
然后，我们对分别含有人口年龄结构变量，即各年龄段人口所占总人口的比重的四个消费函数模型进行了检验。
This paper introduced the current situation of the staffs age structure in 1994. These people came from 106 scientific and research institutions in domestic environmental protection field.
介绍了1994年我国环保系统106个科研机构的科研人员年龄构成的现状。
Absrtact: In modern volleyball world it has become an important factor for match results impacted by the age structure, the difference of height and weight.
摘要：在现今世界排坛，队伍年龄结构是否合理，以及在体重、身高方面的差异，已经成为影响比赛结果的至关重要的因素。
Absrtact: In modern volleyball world it has become an important factor for match results impacted by the age structure, the difference of height and weight.
摘要：在现今世界排坛，队伍年龄结构是否合理，以及在体重、身高方面的差异，已经成为影响比赛结果的至关重要的因素。
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