种群比较

In this algorithm, first, a crowed comparison operator is used to sort and select individuals according to the characteristics of multi-objective optimization. Then, a non-uniform mutation operator is applied to the observation populations to preserve the convergency of the solutions and to improve the precision of local search. Finally, a diversity-preserving operator is employed to delete the observation populations for the purpose of preserving the solution diversity.

首先，根据多目标优化特点，使用多目标密度比较算子对量子种群进行排序和筛选；然后，应用非均匀变异算子对观测种群进行变异以保持解的收敛性并提高局部搜索的能力；最后，使用多样性保持算子对观测种群进行删减以保持解的多样性。

We use comparison theorem and a new method to analysis the problem of persistence and extinction.

消费者种群的长期影响，利用比较定理及一种全新的方法对自治Leslie系统给出了种群弱持续生存和灭绝的条件；对拟非自治系统给出了种群弱持续生存和灭绝的阈值。

Boundednesses of population and toxin in population and in the environment are shown by comparison theorem.

通过比较定理得到了种群的有界性，及种群体内毒素和环境中毒素的有界性。

In the first chapter, we research the dynamics of population which were in the polluted environment, we will: give the corresponding mathematical model;(2): obtain the explicit conditions for the threshold of the population by means of comparison theorem.

第一章是研究污染环境中种群的动力学行为，首先给出相应受污染系统的数学模型，然后研究系统中种群的持久生存和灭绝问题，在具体模型中，运用比较定理研究种群生存的阈值。

It could increase the utility efficiency of marine fishery resource,which thinks about fish harvest and breed rules all together.In this paper,it uses mathematical methods to analyze the Bio-economics theories provided by Flaaten's studying on competing species in marine resource.According to our results,it is shown that the price of one economical fish c...

通过对Flaaten的生物经济学模型的数理分析比较，提出经济鱼种的价格上涨并不会导致该鱼种生物种群存量下降，如果管理措施合理，鱼类种群存量依然存在上升的可能；并由此指出海洋捕捞必须考虑种群间相互关系，利用合理的生物经济学模型、建立明晰的海洋捕捞权等措施有助于海洋生物经济的持续有效发展。

The genetic relationship between two canine populations is closer than their genetic relationships with the marmot population.

三。在研究的三个人蚤地理种群中，寄生家犬的两个种群在遗传关系上比较接近；寄生旱獭的种群和前两者之间的遗传关系较远。

While in Ass.haloxy persicum-H.ammodendron communities, either Haloxylon ammodendron population or Haloxylon persicum population, the spatial pattern was also congregative in 0~50m scales.While sometimes there was a transition from congregative pattern to regular pattern between them. There was a negative or positive, no relation and negative relation change series between Haloxylon ammodendron and Haloxylon persicum. In Ass.

梭梭-白梭梭群落的梭梭种群和白梭梭种群的空间格局比较复杂，但在所研究的尺度(0～50m)上，种群空间格局呈聚集分布或由聚集分布向均匀分布转变；梭梭与白梭梭的种间关系在空间上呈负相关或正相关、不相关和负相关变化序列。

The results showed that seedlings were abundant in both areas, but survival rates were low. The survival rate curve of the population fell between DeeveyⅠand DeeveyⅡ types. The trends of the disappearance rate and mortality rate curve are consistent. The spectral analysis indicated that there was a periodic regularity in the process of natural regeneration of cercidiphyllum japonicum.

结果表明：两个地区连香树种群幼苗个体比例都比较大，但死亡率很高；存活曲线介于DeeveyⅠ型和DeeveyⅡ型之间；消失率和死亡率曲线变化趋势一致；种群动态过程存在周期性，种群数量动态不仅受基波的影响，而且还显示出了小周期的波动。

Two Elsholtzia haichouensis Sun populations, one from Cu mine sites and the other from uncontaminated sites in Hubei province, were investigated in hydroponic experiments for the differences of Cu accumulation and ecophysiological responses to Cu under Cu treatment.

以海州香薷铜矿区种群和非矿区种群为对象，通过水培实验，比较分析了两个种群根中铜的吸收、MDA含量、根伤流液量和酸性磷酸酶活性变化的差异。

The P. flagellaria clonal population distributing in the Songnen grassland was studied,and we observed the season dynamics of petiole length and the total stolon length as well as pattern of spacer length,compared the numbers of maternal ramets,daughter ramets and single ramets as well as the yearly dynamics of total biomass in 3 years (2003,2005,and 2006). Furthermore,we analyzed the correlation between population quantative character and the community's quantative character.

以松嫩草地羊草草甸内分布的蔓委陵菜无性系种群为研究对象，观测了叶柄长度、匍匐茎总长度的季节动态以及间隔子长度分布格局，比较了3个年份（2003、2005、2006年）的种群母株数、分株数、独立株数和总生物量年间动态，分析了种群数量特征与其所分布的群落的数量特征之间的相关关系。

I am accused of being overreligious," she said in her quiet, frank manner,"but that does not prevent me thinking the children very cruel who obstinately commit such suicide.""

客人们在卡罗利娜·埃凯家里，举止就文雅一些，因为卡罗利娜的母亲治家很严厉。

Designed by French fashion house Herm è s, this elegant uniform was manufactured in our home, Hong Kong, and was the first without a hat.

由著名品牌 Herm è s 设计，这件高贵的制服是香港本土制造，是我们第一套不配帽子的制服。