聚集

As these hydrometeors jostle about, updrafts push the smaller positively-charged particles towards the top of the cloud, leaving the negative charges concentrated at the bottom.

当这些水气凝结体相互聚集并发生碰撞时，上升气流会推动带正电荷的较小的颗粒向云层上方移动，剩下带负电荷的较大颗粒，则聚集在云层下方。

As to space distribution, Pearl river delta region, the developed and population-flow frequent areas, was mostly affectible districts(96.66%).

地区分布以经济发达、人口流动频繁的珠江三角洲地区为主，占病例总数的96.66%；患者以青壮年居多；医务人员是高发人群，占病例总数的24.9%；该病有明显的家庭和医院聚集，聚集性病例占37.1%。

Excrescens larvae was in aggregative distribution and the aggregation was caused by both the insect's biological characteristics and the environmental factors.

结果表明：柳蝙蛾幼虫的空间分布型为聚集分布，聚集的原因是由害虫本身的生物学特性和环境因子共同作用所造成。

The results showed that the semivariogram of S.granarium was described by a spherical model,and indicated an aggregated special pattern ranging from 21 to 61cm. The semivariogram of Aphidius sp.could be also well described by spherical model, and indicated an aggregated spatial pattern ranging from 36 to 55cm.The amount and spatial distribution of Aphidius sp. w...

结果表明，不同时期麦二叉蚜种群的半变异函数曲线皆为球型，其空间格局为聚集型，变程在 2 1～6 1cm之间；蚜茧蜂种群的拟合半变异函数曲线也表现为球型，呈聚集空间格局，空间变程在 36～ 5 5cm之间，并与麦二叉蚜种群在数量和空间上有较强的追随关系，说明蚜茧蜂种群是麦二叉蚜种群的优势种天敌。

Based on analysis on index of gathering, Cnidocampa flavescens hibernating cocoon is defined to be in negative binominal distribution.

通过聚集度指标的计算分析，明确了黄刺蛾越冬茧呈聚集型的一般负二项分布。

Further study by Blackith's (1961) formula showed the aggregation was relative with bionomic of insect.

采用Blackith(1961)聚集均数法对结果进一步分析表明其聚集原因主要由生物学习性引起。

The only differences in colour within the Benedictine federation are those of the monks of Monte Vergine, who though now belonging to the Cassinese congregation of Primitive Observance, still retain the white habit adopted by their founder in the twelfth century, and those of the congregation of St.

唯一不同肤色的本笃会联合会是那些僧人的Monte Vergine ，虽然现在谁属於Cassinese聚集原始遵守，仍然保留了白色的习惯通过其创始人在12世纪，和那些聚集圣Ottilien ，谁穿红色腰带，以显示其特殊的传教性质。

In order to preserve the varieties of the swarm and avoid to be in premature convergence,a Particle Swarm Optimization algorithm based on the differential evolution mutation is proposed.The new algorithm uses the particle aggregation quality to judge that if the particles in the swarm are congregative so much,then apply the differential evolution to mutate the self prevenient best position of each particle,in order to realize the aim of preserving the varieties of the swarm.

为了保持粒子种群的多样性而避免发生&早熟&的问题，提出一种基于差异演化变异的粒子群优化算法，该方法通过粒子聚集性判断如果粒子群中的粒子过于聚集，则使用差异演化算法对PSO算法中各个粒子的自身历史最佳位置进行变异，以实现保持粒子群种群多样性的目的。

Using the spatial point-pattern analysis of Ripley's function, the result indicated that Halostachys caspica population of Ass.halocnemum strobilaceum-H.caspica community on the northwest edge of Junggar Basin shown congregative pattern in 0~50m scale.But Halocnemum strobilaceum population shown congregative pattern in the same scale or the less scale. And there was a positive, no relation and negative relation change series in space between Halostachys caspica and Halocnemum strobilaceum.

采用空间点格局分析方法Ripley，s K函数分析表明，准噶尔盆地西北缘盐穗木-盐节木群落的盐穗木种群在所研究的尺度(0～50m)上呈聚集分布，盐节木种群呈现聚集分布的尺度等于或小于盐穗木种群；盐穗木与盐节木的种间关系在空间上呈正相关、不相关和负相关变化序列。

Haloxylon ammodendron-H.persicum communities, Haloxylon persicum population had a transition from congregative pattern to regular distribution within the scales of 0~50m, while Haloxylon ammodendron population was congregative pattern. There was a negative, no relation and positive relation change series in space between Haloxylon persicum and Haloxylon ammodendron.

白梭梭-梭梭群落的白梭梭种群在所研究的尺度(0～50m)上由聚集分布向均匀分布转变，梭梭种群呈聚集分布；白梭梭与梭梭的种间关系在空间上呈负相关、不相关和正相关变化序列。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。