查询词典 parameter of population

We also find two species can coexist only when taking the medium values in some range of parameter,if it is too large or too small only one population can exist or none of them can .

其它的参数不变，而只变化某一个参数的取值，且这一取值变化符合这一参数划分区间，定态会经历这一区间内的多种状态，且会出现临界点，普通渗流与定向渗流类相互转化，且出现两个临界点，两次相转变。

The validity of simulation results were tested by experiments. Through statistical analysis, the parameter (μ,σ2) of normal distribution function of the maximum load, and tested uniformity of the normal population and the sample were obtained.

在此基础上，随机生成200个典型海底地形，对采矿头截齿最大载荷的分布特性进行研究；应用置信度为0.95的柯尔莫哥洛夫斯米尔诺夫(Kolmogorov-Smirnov)检验验证参数估计所得的正态总体与样本数据的一致性。

In order to improve the variety and universality of the new population in the parameter space, the method of anisomerous crossover is designed.

为提高新生个体的多样性及其在参数空间中的遍布性，提出并设计了不对称交叉的具体方法。

And such methods V/m ratio t-test, negative binomial parameter, index of dispersion, Cassie index, index of clumping, index of mean crowing and index of patchiness are employed to analyse various dominant populations of Heptacodium miconioides community in the Tiantai Mountain in Zhejiang province and distributive patterns of Heptacodium miconioides community in different quadrats, and this paper also examines the intensity of Heptacodium miconioides population in different quadrats by means of stand classes.

摘 要 以浙江省天台山七子花群落为研究对象，采用相邻格子样方法取样数据，应用方差／均值比的t检验法、负二项参数、扩散型指数、Cassie指标、丛生指标、平均拥挤指数和聚块性指数等方法，分析了七子花群落各优势种群以及七子花种群在各样地中的分布格局，并分立木级对七子花种群在不同样地内的集群强度进行了测定。

The standard error of a statistic provides an indication of how accurate an estimate it is of the population parameter.

统计量的标准误差表示该统计量作为总体参数的估计的准确程度。

This article first discusses the practical significance of the control system of nonlinear population parameter and builds its mathematical model, such proving the mere existence and the stability of the answer of the systematic model.

在文中，首先论述了非线性人口分布参数控制系统的实际意义，并建立了非线性人口分布参数系统的数学模型；进而证明了系统模型的解的存在惟一性、解的稳定性。

Seed dispersal is one of the processes of landscape ecology. Acknowledge of seed dispersal process and mechanism not only revealing future construction composition and dynamic about species population and community, applying parameter for landscape model, but also providing theoretical foundation for vegetation resume and environment protection.

种子扩散研究是有关景观过程的研究，了解种子扩散的过程以及扩散机制，不仅能够了解物种、种群以及群落未来的结构、组成与动态、为景观模型提供参数，而且为植被的恢复、自然环境的保护提供理论依据。

According to the method of aircraft system simulation, the control law is validated by simulation based on the population parameter equation of motion of an aircraft. The results indicate that the control law can meet the requests of the UAV, which are safe launch, stable climb, steady fight along the designated altitude and heading holding certain attitude. And then, the UAV can fly following the scheduled fairway.

利用飞机系统仿真的方法，采用飞机全量扰动运动方程对该型无人机飞行控制系统的控制律进行了仿真验证，结果表明，文中所设计的该型无人机飞行控制系统的控制律可以实现该无人机安全发射、稳定爬升、高度稳定、姿态稳定、航向稳定的要求，进而可以实现无人机按预定航路的飞行。

In this dissertation, An improved adaptive genetic algorithm for robust test generation is presented, which adaptively adjust genetic parameter with evolution effect and the choice of initial population is based on the feature of the robust test.

本文对标准遗传算法进行了改造，提出了一种自适应遗传算法来解决强健时滞测试生成，该算法建立了根据进化程度调整群体尺寸的启发策略来加速测试生成，并且在初始群体的选择上充分利用了强健时滞测试的特点以取得优良的初始群体。

Besides, this paper is based on the data of the population censes in 2000 with the total fertility rate as the controlling parameter, using PEOPLE and EXCELL to make an analysis of the trend of the oldest- old in China. The result of this analysis demonstrates that the oldest-old is increasing at the fastest rate in China, which has become a block in the development of China.

本文还以中国2000年人口普查数据为基础，以总和生育率为调控参数，在一定的死亡水平之下，采用People和Excell对中国高龄老年人口进行趋势分析，预测结果表明，中国高龄老年人口仍然是增长最快的人口群体，其问题的严重性已不言而喻。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。