查询词典 population explosion

The Markov forecast model, time series method (triple exponential smoothing method and a combined of triple exponential smoothing method and Markov model) and stepwise regression forecast method were choosed, and the basic principles and processes of the three models were analyzed and compared. Based on above, the three methods were used to predict population dynamic of Cricetulus barabansis and Meriones unguiculatus. The characteristic, accuracy and applicability of three methods were analysed and compared. The results showed that,(1) Markov model belongs to a middle-long time forecast model, and the result was interval forecast, but it reached the requirement of forecasting the harmful population dynamic of rodents. Through the forecasted population dynamic of Cricetulus barabansis and Meriones unguiculatus in 2004, the results were accurate; this meant that Markov model was a good forecast model to Cricetulus barabansis and Meriones unguiculatus population.

选择马尔可夫链预测模型、时间序列分析法(三次指数平滑法、三次指数平滑法和马尔可夫链预测模型的组合预测法)和逐步回归预测法，对这三种模型的基本原理、模型的构建过程进行对比分析，在此基础上用此三种方法预测了黑线仓鼠和长爪沙鼠的种群数量，并对三种方法的特点、预测的准确度和适用范围进行了比较分析，结果表明：(1)马尔可夫链预测模型属于中长期预测，预测的结果为区间预测，但对于害鼠种群数量的预测来说已经达到要求，通过对2004年黑线仓鼠和长爪沙鼠种群数量的预测，预测的结果都比较准确，这说明对于预测黑线仓鼠和长爪沙鼠种群的数量动态，马尔可夫链模型是比较好的模型。

In the 2A1 distorted trigonal bipyramid structure ,the single non equivalent Ga atom has the population of 4s 4p ,while the two equivalent Ga atoms have the population of 4s 4p .this compares with a Ga population of 4s 4p in the undistorted D3h structure ,hence the jahn-teller distortion causes depletion of the charge density on the 4s orbital of the non-equivalent Ga atom, and enhancement of charge density on the 4s orbital for the two equivalent atoms .an opposite trend is observed for the 4p orbitals of these Ga atoms .the P population for the two equivalent atoms is 3s 3p .the populations of the other 2B1 state with the edge-capped tetrahedral structure are similar with the exception that all three Ga atoms have similar but not identical populations .

在2A1被变形的三角bipyramid结构，唯一非等效Ga原子有4s 4p的人口，而二个等效Ga原子在未变形的D3h结构有4s 4p 。this的人口和4s相比4p的Ga人口，因此jahn出纳畸变在non-equivalent Ga原子的4s轨道导致电荷密度的取尽，并且电荷密度的改进在4s轨道为二个等效原子。an在趋向对面对这些Ga原子4p轨道被观察。the人口为二个等效原子是另一个2B1状态3s 3p 。the人口与边缘加盖的四面体结构是相似的P 除之外全部三个Ga原子有相似，但不相同人口。

The results showed that the number of young individuals was larger than that of middle aged and old individuals in the B. platyphylla population. The population had one peak of mortality in size class Ⅴ. The survival curve of the population appeared to be the Deevey-Ⅱ type. The population was a rise type at present.

结果表明：白桦种群幼年个体丰富，中老年个体相对较少，种群在第V龄级出现死亡高峰，种群存活曲线属于Deevey-Ⅱ型，白桦种群目前表现为增长型种群。

Thunbergii trees were established, and the sun survivorship curves were drawn with field data. The results showed that in the three plots, the height and basal diameter growth of regenerated young P. thunbergii trees had exponential, linear, and quadratic functional relations with age and the age structure was of spindle, discrete, and pyramid types, respectively. Most of the regenerated young trees were distrbuted at 0.3-1.2 m from their nearest standing trees, and the individuals of the young trees decreased near to or far from the nearest standing trees. Inplots Ⅰ and Ⅲ, the expected average life of regenerated young P. thunbergii trees had a decreasing trend with their increasing age, and the survival number of the population also decreased with increasing population age. The survivorship craves of regenerated young P. thunbergii trees in the two plots approximated to the type of Deevey Ⅱ, indicating that the young P. thunbergii populations in the plots were at stable development stage. The population structure of regenerated young P. thunbergii trees in plot Ⅱ was lesser integral, suggesting that the population was of declining types being related to human disturbance, slope and other environmental factors.

结果表明：(1) 3个样地中幼龄植株高生长、基径生长与年龄均分别呈指数函数、直线和二次函数关系；(2) 3个样地黑松幼龄植株年龄结构存在着明显差异，分别表现为纺锤形、残缺型和金字塔型；(3)幼龄植株主要集中分布在距最近立木0.3~1.2m，离立木越近或越远幼龄植株均逐渐减少；(4)对样地Ⅰ和样地Ⅲ黑松幼龄植株生命表和存活曲线的分析表明，随年龄的增加，黑松幼龄植株生命期望值基本上呈递减趋势，黑松幼龄植株种群存活数也随着年龄的增加而降低；样地Ⅰ和样地Ⅲ黑松幼龄植株种群存活曲线近似于Deevey Ⅱ型，表明2个样地黑松幼龄植株种群处于稳定发展阶段；(5)样地Ⅱ幼龄植株种群结构很不完整，表明该种群属于衰退型，与人为干扰及坡度等有关。

Based on the data of the fourth population census in Fujian province,we drew population age pyramides model,analysed the Change of population age structure in every period and predicated the population of the 2000nd year by an age-transfering way.

根据福建省4次人口普查资料绘制人口年龄金字塔，分析各个时期的人口年龄结构变化，并根据第四次人口普查资料，采用人口年龄移算法预测2000年人口。

Population viability analysis has the important value for the conservation and management of the small population. This article introduced the progress of the population viability analysis on birds and discussed the population dynamic in 100 years of the Cabot's tragopan in Wuyanling National Nature Reserve.

种群生存力分析对小种群的保护和管理具有重要的价值，文中介绍了种群生存力分析在鸟类学研究中的进展，探讨了在研究数据不完备的情况下进行种群生存力分析的风险性。

Or 10.40％ of the variation was partitioned among voltinism populations. The Nm (4. 3065) showed that there was to some extent gene flow among three voltinism populations. The average Nei's genetic identity was 0.9637. The genetic distance between V1 population and cultivated V1 population was the biggest (0.0438) and the less was 0.0370 between V1 population and V2 population.

Nei基因多样性指数也是2化群体最大（0.2631），1化群体次之（0.2485），培育1化性群体最小（0.1709），3个群体之间的遗传分化系数为0.1040，即3个化性群体之间的遗传变异占到总遗传变异的10.40％。3个化性群体之间的基因流达到4.3065，表明化性群体间存在着一定程度的基因交流。3个群体之间的遗传一致度为0.9637，遗传距离以培育1化性群体与1化性群体最大（0.0438），以1化群体与2化群体最小（0.0370）。

The research method is combining historic happening with scientific research.This paper is composed of seven chapters. The preface explains briefly the reason of choosing this topic and its significance, as well as the existent research situation in the academic circle.The first chapter presents the subjective and objective historical condition of the formation and development of his view about population quality in four aspects.The second chapter gives a full play to its evolution: it gestates and germinates before the failure of the revolution in 1911, takes shape and develops in the period of Base Area. The following period after the founding of People's Republic of China is its mature time. This view also experiences twisty developments in China's exploring period of socialism.The third part focuses on its major connotations, including Mao's narration on the connotation of Population quality, his analysis of contradiction between population quality and Chinese revolution and construction and of their significance, and the way to enhance Chinese population quality.The fourth chapter makes analyses of philosophical support of Mao's view from three "adherences": adherence to basic principle of seeking truth from facts;adherence to the common acknowledged fact that the people is the main part of history;adherence to the dialectical relation between being and consciousness.

全文共分七个部分：前言部分概述了本文选题的由来及意义，以及目前学术界对这一问题的研究现状；第一部分主要从四个方面论述毛泽东人口素质观形成和发展的主客观历史条件；第二部分描述了毛泽东人口素质观的演变轨迹：大革命失败前人口素质观的孕育和萌芽；根据地时期人口素质观的形成和发展；建国初期人口素质观的成熟以及全面探索社会主义建设时期的曲折发展；第三部分重点介绍了毛泽东人口素质观的主要内涵，包括毛泽东对人口素质内涵的论述，对人口素质与中国革命和建设的矛盾性分析，人口素质与中国革命和建设的重要性分析，以及如何提高中国人口素质等；第四部分分析了毛泽东人口素质观的哲学依据，主要有三个方面：坚持实事求是的基本原则；坚持人民群众是历史的主体；坚持存在与意识的辩证关系。

MethodL. chinense population distributed in Luosike mountain in Duyun City was investigated by the exampling method of 10m×10m,and combined with investigation on L. chinense population in shrub stratum by 4 m×4 m exampling method and on that in herb stratum by 1 m×1 m exampling method within the quadrat,the dynamic characteristics of the population were studied on the existing analyses of population size and static state life table etc.

方法］采用10 m×10 m取样方法对分布于都匀市螺丝壳山的鹅掌楸种群进行调查，结合在样方内对灌木层用4 m×4 m，草本层用1 m×1 m样方进行调查，从种群大小级和静态生命表的生存分析等方面，研究该种群的动态特点。

Significant differences were shown in the observation times of females during the peak and the middle of the reproductive season at different densities. The observation time of the females was much longer in low density population than that in high density population. For males, there was no significant difference in observation time between or among population densities. At both low and high population densities significant seasonal variation was found in the duration and frequency of male plateau pikas observation behavior, nor was that of females.

结果表明：在繁殖盛期和繁殖中期，低密度种群内雌性高原鼠兔的观望时间均显著高于高密度种群内，而在其它两个时期内无明显不同；雄性高原鼠兔的观望时间在不同密度间比较均无显著差异；同一密度条件下，雄性高原鼠兔的观望行为持续时间和发生频次均表现显著的季节性变化，而雌性高原鼠兔无明显差异。

A carrier gas such as nitrogen is directed through line 20 and valve 22 to connect with line 26 and mix with the gas sample.

如氮气之类的载体通过管线20和阀22引入，与管线26相通，与气体样品混合。

But for the most part, knaves and parasites had the command of his fortune

然而支配他的家产的大多是恶棍和寄生虫。