查询词典 decrease in population

Middle period up to 21 centuries, the our country will face the bearer oscular three greatest high peaks one after another, then the employment high peak and advanced age of the population total amount high peak, population turn population high peak, pollution of the environment of rigorous also turn worse a land resources can keep on the necessity of exploitation.

到21 世纪中叶，我国将相继迎来人口的三大高峰，即人口总量高峰、人口就业高峰和老龄化人口高峰，环境污染的严峻也加剧了土地资源可持续利用的必要性。

Mathematical model 3.7, 3.16 and 3.30 are the mathematical model of a equilibrium population, and they can be converted into mathematical models of panmixia population and nonequilibrium selfing population.

它可以转换为随机交配群体的数学模型和非平衡自交群体的数学模型。

By the contrast between common population and inbreeding population, we know that the sameness of them are they all take the population for the synthesis of panmixia and selfing or inbreeding.

通过普通群体与近亲交配群体的比较，群体在非平衡条件下，普通群体与近亲交配群体相同的是都把群体作为随机交配和自交或近亲交配两部分的合成群体。

In order to seamlessly combine NSGA-Ⅱ and the greatly different MOPSO, the special concepts (particle and its velocity, Pbest and leader) for MOPSO were dealt with within the scope of NSGA-Ⅱ: 1 particle in MOPSO was considered to be equivalent to offspring individual in NSGA-Ⅱ; 2 the concept of velocity fell into disuse; 3 the concept of Pbest also came into disuse. Instead of that, for each dimension of a particle, the nearest one among its nondominated individuals in parent population was used; 4 the leader of a particle was the individual with largest sparse degree among parent population or selected from parent population by binary tournament selection method, which of them taking effect lies on the predefined probability. In addition, a new concept, i.

为使这两种差异较大的算法实现无缝融合，在NSGA-Ⅱ算法范围内对MOPSO中特有的概念粒子及其速度、Pbest、引导者进行处理：1粒子对应于NSCA-Ⅱ中子代群体的个体；2不再使用粒子速度概念；3不再使用粒子Pbest概念，代之以从父代群体中为每个粒子的每一维寻找一个最近的该粒子非支配个体；4每一个粒子的引导者可以是父代群体中稀疏程度最大的个体或者是按照二进制随机竞赛选择方法从父代群体中选择的一个个体，具体哪一种方式发挥作用依赖于预先设定的概率。

For a given proportion p (where p is the confidence level), a confidence interval for a population parameter is an interval that is calculated from a random sample of an underlying population such that, if the sampling was repeated numerous times and the confidence interval recalculated from each sample according to the same method, a proportion p of the confidence intervals would contain the population parameter in question.

对于一个比例 P而言，一个群体参数的置信区间中的区间是由一个基础群体的随意样本计算出的，假如样本被重复了无数次，置信区间也根据每个样本，以同样的方法重新计算，那么这个置信区间中的比例 P 将要重新定论。

In the solution process the initialization two populations, separately will select the different overlapping variation probability, after each time will iterate the sufficiency high individual carries on the first population's in sufficiency low individual with the second population in the exchange, and will preserve each center group the optimal solution to the outstanding person population, by will solve the tradition genetic algorithms to be easy to appear precociously, will be easy to fall into the partial optimal solution question.

即在求解过程中将初始化两个种群，分别选取不同的交叉变异概率，在每一次迭代完后将第一个种群之中的适应度较低的个体与第二个种群中适应度较高的个体进行交换，并且保存每个种群的最优解到精英种群，以解决传统遗传算法容易出现早熟，容易陷入局部最优解的问题。

The security problems in our country are low population growth rate and overpopulation,population quality not conforming to the requirement of social development,AIDS and other diseases threatening population health,high sex ratio,quick aging and the pressure of employment,etc.

一、人口安全问题的提出人口安全是一个国家最基本、最重要的安全问题之一，直接关系国家的整体安全、社会的持续稳定和健康发展。

Using the analysis of the distribution indexes method, the results indicated that all distribution indexes of Halostachys caspica population, Haloxylon ammodendron population and Haloxylon persicum population accorded with congregated pattern within the scales of 1m×1m、2m×2m、4m×4m、8m×8m、16m×16m、32m×32m. And the T-test evidenced that the deviation from random pattern was obvious in 1~32m scale.

通过分布型指数法分析得出，在1m×1m、2m×2m、4m×4m、8m×8m、16m×16m、32m×32m的空间尺度上，盐穗木、梭梭、白梭梭种群的各项分布型指标均符合聚集分布，并且由扩散系数偏离随机分布的差异性t值检验验证了种群在1～32m尺度上显著偏离随机分布，呈聚集分布。

The uniformity degree and rank of the population are given to measure the distribution and quality of the solutions in the population based on the characteristic. Using the uniform degree of the population as objective function and the rank as the constrained condition, the bi-objective optimization problem is transformed into a single objective constrained optimization problem. The computational equations of the charge and force exerted on the particles are presented.

针对这一特点，定义了种群的均匀度和序值，来度量种群中解的分布和质量，将双目标优化问题转化为以均匀度为目标函数，序值为约束条件的单目标优化问题；设计了双目标优化问题粒子的电荷和受力的计算公式，提出了一种新的类电磁算法求解问题。

Predictable result is that Chinas total population will reach its peak in 2024 at 14.3688 million people (total fertility rate from 1.8), the forecast results show that this model has good prediction accuracy and forward-looking, on Chinas development of appropriate population policy in order to adapt to the comprehensive construction of harmonious society demands of the population have a positive reference value.

预测的结果是我国总人口将在2024年达到峰值14.3688亿人（总和生育率取1.8），预测结果表明，此模型具有良好的预测精度和前瞻性，对我国制定相应的人口政策以适应全面建设和谐社会对人口的要求有积极的参考价值。

Chimborazo and Cotopaxi, took me by the hand.

越过琴博腊索山和科托帕克西山。

This car is in a good condition.

这辆车的状况很好。