查询词典 diversity

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。

Except that the specifications of the single-objective real-valued quantum-inspired evolutionary algorithm are kept, the proposed algorithm has three main features to enhance the RQIEA. First, the crowed comparison operator is used to sort and select individuals in multi-objective sense. Second, the non-uniform mutation operator is applied to improve the precision for local search and to preserve the convergency for the solutions. Third, the diversity preserve operator is proposed to maintain the diversity.

该算法除保留求解单目标优化问题的实值量子演化算法的特点外，还有三个主要特征：首先，根据多目标优化特点，使用多目标密度比较算子对种群进行排序和筛选；其次，应用非均匀变异算子保持解的收敛性和提高局部搜索能力；再次，使用多样性保持算子来保持解的多样性。

Based on similarity science and complex systems theory, this paper studies the principle of diversity analysis for complex mechanical products system. Based on similarity measure, diversity measure method of parts unit and complex machine is presented.

基于相似性科学和复杂系统理论，研究了复杂机械产品系统差异性分析原理，提出了以相似性度量为基础的零部件单元和复杂机械产品系统的差异性度量方法。

Six populations of Cypripedium flavum were studied on their genetic diversity, genetic structure, and clonal diversity in Zhongdian County, Yunnan Province (South-west China).

采用AFLP分子标记方法对云南中甸的6个黄花杓兰居群进行了遗传多样性水平、遗传结构及克隆多样性研究，其中两个居群用样方取样法分析其克隆空间结构。

Based on the statistics characteristics of channel diversity factor, from the point of a new view, for traditional channel diversity technologies a new performance research method is proposed, theory analysis and simulation results testified the validity of the new method.

本文基于信道分集因子统计特性从一个新的角度对信道分集进行了研究，针对传统信道分集技术提出了一种新的信道分集性能研究方法，理论分析及仿真结果表明方法是有效的。

Study on the relationship between soil fertility properties and species diversity in grass layer showed that the main factor affecting species diversity was soil PH, then was the soil total phosphorus.

4对防护林草本层物种多样性指数与土壤肥力因子的关系研究表明：影响草本层物种多样性的主要因子是土壤PH 值，其次是土壤全磷含量。

Matrix quality was a key factor to plant diversity within community; The effect of heterogeneity of small-scale disturbance on species diversity in the next year declined.

随着植物的生长，干扰的异质性对多样性的影响明显变小，无论丰富度、均匀度还是多样性指数，均朝着以基质性质，即资源总量多少的聚类方向发展。

Based on RAPD data, Nei's gene diversity index averaged 0.2523 and Shannon's information index averaged 0.3730, while Nei's gene diversity index averaged 0. 252 3 and Shannon's informative index averaged 0.3958 based on DOGE data.

结果表明：RAPD分子标记显示不同浓度废水驯化的细菌群落的Nei's指数平均为0.252 3，Shannon's信息指数平均为0.373 0；而采用DGGE技术得到不同浓度废水驯化的细菌群落的h平均为0.252 3，I平均为

These images of China full of diversity and mobility simultaneously reflect the diversity, mobility and open-endedness of the writers cultural identity, and so refute the belief in essentialist identity of Asian American literature criticism, and at the same time echo the views on multi-cultural identity and diasporic identity advocated by some Asian American scholars.

从这些富含差异性和流变性的中国形象中折射出来的华裔作家的身份认同也呈多元、流动、开放的形态，从一个侧面反驳了华裔美国文学批评中的本质主义身份观，同时也应和了华裔美国文学研究中的多元文化身份观和离散身份观。

Based on the data collected from 8 plots and using Shannon and Simpson index, this paper calculated and analyzed diversity of Eupatorium catarium community in Hainan. And, niche breadth and niche overlap of E. catarium community were analyzed by using Levins and Pianka formulae. The results were as follows:(1)The diversity of E.

基于对海南儋州地区假臭草群落的调查，应用辛普森和香农指数测定了该地区不同生境类型的假臭草群落的生物多样性；并以各种杂草的重要值作为生态位计算的资源状态指标，应用Levins公式和Pianka公式计算分析了该地区假臭草群落各物种的生态位宽度和生态位重叠。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。