该词条未找到_海词词典

您要查找的是不是：

Age structure dynamics of virgin Larix gmelini forest. 兴安落叶松原始林年龄结构动态的研究
Age structure may also be represented by a survivorship curve. 存活曲线也可以反映年龄结构。
Age structure is a foundational base to study the population dynamics. 年龄结构是研究种群动态的重要基础。
The census results show that big changes have taken place in the population's age composition. 这次人口普查反映出中国人口年龄结构发生了较大变化。
In this paper, we study a nonautonomous SIS model with age structure. 摘要研究具有年龄结构的非自治的SIS模型。
The number of people searching for work in a less developed country depends primarily on the size and age composition of its population. 在欠发达国家中，寻求职业的人数主要取决于该国人口数量的多少与年龄结构。
Results The academic background,technical title,age composition,and gender proportion of nurses in 34 hospitals in Shanghai were summarized. 结果总结上海市34所医院护理人员的学历、职称和年龄结构及性别比例情况。
Judging method of individual age and age structure of Stellera chamaejasme population in degraded steppe. 退化草原狼毒个体年龄判定方法及其种群年龄结构的研究。
The 3rd, want appropriate to solve the problem of worker age structure with overall this locality. 第三，要妥善解决本地总体的职工年龄结构问题。
This article studies the dynamical action of a predator-prey system with age structure. 摘要研究了一类捕食者具有年龄结构的捕食系统的动力学行为。
Based on age structure, pteroceltis tatarinowii populations were expanding populations. 各种群的年龄结构反映保护区内青檀种群是增长型种群。
The experimental population dynamics were also simulatied by means of Leslie matrix model on the basis of estimating the stable age composition of Ummeliata insecticeps (Boes. et Str.) in the paper. 文中还在实验种群稳定年龄组配测定的基础上;应用Leslie矩阵模型模拟实验种群动态;并建立种群增长模型:N=105.;3318e~(0
Age structure and regeneration mechanism of Acanthopanax senticosus population were researched in different ecological environments. 对不同生境刺五加种群的年龄结构和更新机制进行了初步研究。
Ring-width chronologies and tree age structure were both used to investigate the relationship between treeline dynamics and climate change. 而在受季风影响的地区，树木年轮宽度的增加与当年雨季的气候变化关系不大。
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。
Based upon Leslie matrix model with a definite age structure, the consideration of the non-linear complement at random enables the model to reflect some of the random factors. 在确定性具年龄结构的Leslie矩阵模型基础上，考虑具有随机性的非线性补充，使得模型能反映随机因素。
Problems existed in the Antarctic krill age determination were introduced and the methods used in the krill population age structure analysis were reviewed. 本文对国际上有关南极磷虾（Euphausiasuperba）的寿命和年龄鉴定研究的现状、研究过程中所存在的困难和问题进行了分析和探讨，对各种不同的磷虾年龄鉴定方法的特点和存在的问题进行了评述
Based on the theory of demology, the types of population age structure are divided according to the different proportions of elderly population and young population. 按人口学理论，人口年龄结构的类型是依据老年人口或未成年人口在人口中的不同比例来划分的。人口年龄结构类型分为年轻型、成年型和老年型。
Most of them as de jure population,whose age structure and sex struc-ture were of imbalance,had developed the Northeastern frontier region with the minority nationalities there. 由于种种原因而造成年龄和性别结构的失调。他们与各少数民族共同开发东北边疆。