分散度

• Besides the protection of the modules themselves , dispersion is another factor we should take into account in organizing a network . for instance , the trunk lines of a trunk should be dispersed to different 155 mbits trunk modules and each 155 mbits trunk modules to different physical routes
  除了模块本身的保护机制外，在网络的组织上要考虑分散度，如一个局向的中继线要分散在不同的155mbits中继模块，每个155mbs中继模块要分配到不同的物理路由。
• At the same time the study analyse the structural system of the index and it ' s weight with the ahp , and choose soil quality , soil thickness , the content of organic matter , terrain , elevation and the ration of irrigated guarantee as gradation index and choose soil quality , soil thickness , the content of organic matter , terrain , elevation , the ration of irrigated guarantee , the condition of traffic , the distance from the central city , the scatter degree of field , the neat degree of field , loss of water and erosion of soil and land contamination as classification index . at the same time the study emphasize the effect of the condition of ecological condition and environmental contamination
  采用层次分析法对该区域农用地分等定级的指标体系及其权重进行了研究，选择表层质地、土层厚度、有机质含量、地形、海拔、灌溉保证率等6项指标参与分等评价，选取表层质地、土层厚度、有机质含量、地形、海拔、灌溉保证率、对外交通状况、距市中心距离、田间道路状况、田块分散度、地面平整度、水土流失、土地污染等13个因子分指标区进行定级评价，强调了生态条件及其环境污染状况在农用地分等定级中的作用。
• The compound modification of silane wet method and stearic acid dry method modification combine the advantage of individual stearic acid modification and silane modification . the indices are listed as following : wetting contact angle 140 , penetration time 200 minutes , oil absorption contents 1 . 4 , dispersion degree17 . 5 . on the basis of compound modification , silane and stearic acid cooperation modification simplify the modification craft
  试验研究表明，单一硅烷改性，干法效果优于湿法；硅烷湿法与硬脂酸干法复合改性，结合了硬脂酸、硅烷单独改性的优势，改性后的指标分别为：接触角140度，渗水时间200min ，吸油值31 . 4 ，分散度17 . 5ml ；在复合改性的基础上，硅烷与硬脂酸复配干法改性，进一步简化了改性工艺，改性后的指标分别为：接触角145度，渗水时间220min ，吸油值28 . 2 ，分散度18 . 0ml 。
• Anthropogenic activities ( e . g . development , over - grazing , timber harvest ) can disrupt the structural integrity of oasis - desert landscapes and is expected to impede diversity communities across the landscape and make it fragmented . with human dimension and activities enhancing , the patchiness grain , edge density and landscape contrast become large , landscape diversity and patch fractal dimension decreased
  随着人类活动的增强，斑块粒度、边缘密度、分散度、对比度变大，而景观多样性下降，斑块分维数变小，人类生产经营活动导致了绿洲-荒漠景观破碎化，绿洲和荒漠生态系统界面上的突变性、对比度和异质性增强。
• Depending on the diversity of utility function of bundling products , the monopolist whether provide the products individually or in a bundle ( bundling usually can average the whole valuation of products in bundle . thus the monopolist can extract more consumer surplus from the demand curve by bundling the products or service . )
  其中，产品/服务的捆绑或是单独提供取决于客户对捆绑产品/服务的联合效用的分布（通常捆绑策略可以降低客户效用的分散度，从而厂商可以更大限度地获取消费者剩余） 。
• As the fact that nanoparticles from orginal reaction solution have much wider size distribution with deviation larger than 15 % . size - selective precipitation was applied to sharpen the size distribution of those nanoparticles . a size series of qds with improved monodispersity can be achieved just from one sampling solution
  3 .由于生长原液中纳米粒径分布的单分散度较差的现象,采用合成后尺寸选择性沉淀工艺对纳米颗粒尺寸分布进行锐化,能够从一个样品中选出尺寸大小分布,单分散性明显改善的纳米量子点。
• 2 . the structure of purple soil is meliorated by sabaigrass . when contrast to bare land treatment and natural wild grassland treatment we knew that sabaigrass treatment and grass tree solid plating treatment reduced soil bulk density , enhanced soil capillary porosity , non - capillary porosity and porosity ratio , decreased soil sand grain content , enhanced soil clay grain and silt grain content so as to reduced the dispersal degree of soil , improved the aggregate capacity of soil , increased the amount of soil aggregate structure , meliorated the water permeability of soil , accelerated the form of good soil structure
  龙须草能改善紫色土的土壤结构龙须草纯种植被和林草立体种植植被能不同程度地降低土壤容重，减少土壤砂粒含量，增加土壤的毛管孔隙度、非毛管孔隙度和孔隙比，以及增加粉粒含量，从而降低土壤分散度，提高土壤团聚性，增加土壤团粒结构数量，改善土壤的透水性，促进良好土壤结构的形成，最终提高土壤的蓄水保肥性能，增强土壤的抗蚀性和抗冲性。
• Nano - alkali metal hydrides and lanthanide hydrides can be prepared easily by the direct hydrogenation catalyzed by ticl4 in tetrahydrofunan ( thf ) under normal pressure . lanthanide powder of nanometric size in a finely dispersed active form was generated by the thermal decomposition of organolanthanide in vacuum . 1
  本文应用络合催化法，在常温常压下，在萘/ ticl4催化体系作用下合成纳米尺寸碱金属氢化物（以nah为代表） 、纳米尺寸镧系金属氢化物（以smh3为代表）和镧系金属有机化合物（以蒽镧为代表） ，并通过真空热解镧系金属有机化合物得到高分散度的纳米尺寸镧系金属粉末（以la为代表） ，主要考察如下三个方面的内容。