查询词典 parameter of population

Then, introducing the improved straight-line stabilization method to control the chaotic phenomena in the models, a controller is designed to stabilize the biological population in the oribits where the fixed points lie on, thus eliminating the chaotic phenomena in population to keep the population system in persistent existence.

其次采取改进的直线稳定化方法控制模型所存在的混沌现象，设计并求得了使得生物种群稳定到不动点轨道的控制器，最终消除了种群中存在的混沌现象，从而保持了种群系统的持续生存。

Meichuan Wuxue City is located in the northern part of town, is located in Qichun, Huang, Wuxue three counties junction, the territory of 272 square km area, 142,000 of the total population, urban area of four square kilometers, urban population of 36,000 people, Xiaman 5 community, 79 administrative villages: Meichuan, politics, Pu Mei, Sangzi Park, Mountain, Yang embankment, slope Wuli, Wang, Whitehead, Zhang, the next process, Tonggu, Shilipu, bridge, storm dragon, cursory, FAN Bo tree, Nguyen Gallery, Fan should be you, Miss V VII, Si-Li, Luo, including France, West Wing, Zheng Hu, Wang埒, solutionsnian ci , Zhen Lu, Xie Jin Pei, Lü ancestors, Lu Quan II , Water Tower Bridge, Chestnut Hill, Hu, Yang Shop,chen fu lu , Si River, Zhang Ji, inserted Kei,垴Kenzan, Wu farm, Shek, stone vessels,垴solutions, Li 2, Sally population, Village, Song Li benefit Zhao, Mountain, buried Guo, Wu, Song Chong, lotus leaf forest, evergreen forest, peaks I, together, under Zhao, View Hill, Stephen I, Changling, Zhang Xian, Wang, Zhang card, Home Wensheng, Ma Long, last Hao, Taos,fang hong , home bars, Liu, Rao for the city, Cai, pangu file Chapter I.

梅川镇地处武穴市北部，位于蕲春、黄梅、武穴三县结合部，版图面积272平方公里，总人口14.2万，城区面积4平方公里，城区人口3.6万人，辖5个社区，79个行政村：梅川、从政、梅浦、桑梓园、灵山、杨垸、五里坡、王胜、白石、张焕、下程、铜鼓、十里铺、桥头、困龙、走马、范柏树下、阮廊、范应佑、吴伏七、李兴泗、罗林、包法、永西、胡政、王埒、解念慈、卢子珍、解金坡、吕兴祖、鲁全二、塔水桥、栗山、胡立、杨铺、陈福禄、思河、张思济、插箕、干山垴、吴畈、石牛、石船、解垴、李云二、仙人口、南村、宋林、李受益、赵俊、岳山、郭埋、吴大、宋冲、荷叶林、绿林、峰口、同心、下赵、观山、泉口、长岭、张德先、王贵、张牌、居文胜、马垅、上郝、陶斯、方洪、居杠、刘昌、饶为市、蔡林、盘古档、胡导章、吕四房、夏柳、司古塔、回垅。

In building a well-to-do society, the bringing-up ratio is overestimated or underestimated by the analysis on the ratio due to the different population policy under the condition of increasing aging population, the under-construction of social guarantee system, and the arduous task of population control.

基于我国人口老龄化逐渐加重，社会全民保障体系尚未建立与完善，人口控制任务依然艰巨的情形下，通过指出在抚养比的计算中存在的问题，以及比较分析不同人口政策的抚养比，借以阐述我国的抚养比存在失真，即存在"高估"或"低估"现象。

This paper starts with the Naroll-Bertalanffy's hypothesis of the allometric growth of urban-rural population, namely and Sherratt's model about the distribution of urban population density, which are both based on the Christaller-l o ··sch's central place hypothesis and the hypothesis of supposing the regional population movement on the ideal land surface is similar to Brownian movement process.

基于中心地假设，从城市人口分布的Sherratt模型和Naroll Bertalanffy的城乡人口异速生长关系出发导出关于人口分布空间动力学和城市扩展时空过程的数学模型，然后借助Batty等关于城市生长的DLA -DBM模拟结果证明人口的区位选择过程与城市的分形形态存在着内在关系。

The study also summarizes the theories of rural population flow both home and abroad from the economic perspective, and makes the model of the rural population flow in the background of politics, Economy, society and culture in the transition period of China upon the binary economic structure theory, by-business theory,"push-draw"theory, anticipated revenue hypothesis, new labor force move and other population flow theories.

文章总结了国内外从经济方面研究农村人口流动的基本理论，特别是在二元经济结构理论、兼业理论、"推——拉"理论、预期收入假说、新劳动力转移理论等人口转移理论的基础上，结合中国转型期的政治、经济、社会、文化背景，构建了转型期中国农村人口流动的理论模型；经过实证分析，对河南省农村人口流动的历史过程和现状有了较为全面的认识，这对河南省农村人口流动的经济动因有了明确的认识。

The results showed that the cephalothorax of Burma population was relatively smaller, and the dactyl length and prododus length of major second pereropod were larger than those of Thailand population, which proved Burma population had stronger activity and ability to get food.

结果显示：缅甸品系具有头胸部相对较小的特征，其第二步足的指节长、掌节长和宽均大于泰国品系，体现了较高的活动性和取食能力。

The results showed that the cephalothorax of Burma population was relatively smaller , and the dactyl length and prododus length of major second pereropod were larger than those of Thailand population , which proved Burma population had stronger activity and ability to get food .

结果显示：缅甸品系具有头胸部相对较小的特征，其第二步足灌足的指节长，掌节长和宽均大于泰国品系，体现，广较高的活动性和取食能力。

1Niche construction can lead to stable coexistence of diverse genotypes in spatially structured population, which supports a stable polymorphism even without heterozygote superiority.(2)With habitat deterioration, niche construction accelerates the formation of steady polymorphism and hence impedes the harmful influences of environment on the population, which might embody a life-history strategy of organism under the unfavorable environment.(3)Niche construction results in the coexistence with alternative polymorphism through genotype-environment feedback and limited gene flow.(4)The niche-constructing organism is an active force to alter its environment and hence the direction of natural selection in order to better survival.(5)Spatial dynamics and distribution pattern of metapopulation are profoundly influenced by time-lagged niche construction.(6)Metapopulation size can reach a fixed level in the recency effect and equal weighting of time lag but is statistical stability in primacy effect, which implies the primacy effect is most remarkable.(7)The increment in the relative weightingof each generation\' niche construction and the length of time lag are significant factors for system destabilization.(8)Moderate capacity of positive niche construction benefits the metapopulation persistence.(9)The narrowing of niche breadth can decrease the metapopulation size and thereby increase the extinction risk.(10)The coupled function of time lag and niche construction make the system oscillation and generate the spiral wave, spiral-broken and circular wave in heterogeneous habitat.The spatial distributions of metapopulation and resource content are complementary due to a phase lag of their both frequencies.(12)Metapopulation persistence with niche construction depends not only on the balance between colonization and extinction, but also on the balance between the ability of niche construction and natural dissipation of habitat.(13)Metapopula-tion can survive under certain condition when the percent of suitable patches in habitat is lower than the ration of extinction to colonization.(14)Two thresholds exist in the process of transition of habitat quality dynamics from unsuitable to suitable, which include the intensity of niche construction and the initial condition of system.(15)Metapopulation size is positive correlated with the ability of positive niche construction, which means that organism or population who has strongly positive influences on their environment plays an important role to maintain the available habitat.

通过上述几个方面的研究，主要得出以下15条结论：(1)生态位构建可使空间结构种群，甚至是在没有杂合子优势的条件下，形成多种可能的稳定基因型分布模式；(2)随着环境的破坏与恶化，种群的生态位构建作用加速其较早形成稳定多态以阻碍环境对种群的不利影响，解释了有机体在不利环境下的一种生活史对策；(3)生态位构建作用通过基因型—环境反馈机制及有限的基因交流导致基因型多态的稳定共存；(4)有机体的生态位构建作用是一种积极的动力改变环境进而改变其自然选择的方向；(5)生态位构建的时滞作用对集合种群动态和空间分布产生深刻影响；(6)集合种群大小在时滞的崭新效应和等权重效应下达到一固定值，而在首位效应下达到统计稳定，表明首位效应的影响最显著；(7)首位效应下生态位构建相对权重的增量和时滞的长度是影响系统不稳定性动态的关键因素；(8)适中的生态位构建强度有利于集合种群的续存；(9)生态位宽度变窄会减少集合种群的数量从而增加其灭绝风险；(10)时滞和生态位构建的双重作用使系统产生周期振荡，并在异质性环境中产生稳定的螺旋波，破碎的螺旋波和环形波三种分布模式；(11)集合种群与资源含量的空间分布因为相滞而互补；(12)具有生态位构建的集合种群续存不仅取决于侵占率与灭绝率之间的平衡，而且依赖于生态位构建能力同其生境的自然消耗速率之间的妥协；(13)当生境中适合侵占的斑块比例小于其侵占率与灭绝率之比时，生态位构建作用促使集合种群在一定条件下续存：(14)生境斑块的状态从不适合到适合转变过程中存在生态位构建强度和系统初始条件这两个阈值；(15)集合种群的大小同正生态位构建能力正相关，意味着对环境具有较强正作用的有机体对维持有效生境起积极作用。

When the larvae were fed with Apricot and apple-pear the death rate of the larvae increased,the larval and pupa stages prolonged, the pupa weight decreased, female adult life shortened and the average fecundity.The age-specific life table of codling moth indicated that the trend index of codling moth population fed on Jonathan apple, Red Delicious apple, Zhangye number two apple, Chinese pear-leaved crab-apple and Crisp pear were more than one. Experiment population quantity was at the growth condition. The trend index of codling moth population fed on Apple-pear and Apricot were less than one.

通过不同寄主植物饲养条件下苹果蠹蛾特定年龄生命表的分析可知，取食沙果、早酥梨、红玉苹果、红元帅苹果和张掖2号苹果的苹果蠹蛾实验种群的种群趋势指数均大于1，实验种群数量处于增长状态，而当苹果蠹蛾取食苹果梨和杏时，其种群趋势指数小于1，下代种群(来源：Ab9b9BC论文网www.abclunwen.com)数量不断减少。

The CPI-W's population represents about 32 percent of the total U.S. population and is a subset, or part, of the CPI-U's population.4. Is the CPI a cost-of-living index?

这样一种经济环境令人担忧，因此，如何理解CPI指数便成为一个十分重要的问题。

Diabetes is a social disease that affects several million people worldwide.

糖尿病是一个社会性疾病，全世界有数百万人罹患此病。

I'll call you on Friday to see if we can reschedule our luncheon meeting at your convenience.

我星期五会给您打电话在您方便的时候我们重新安排我们的午餐约会。