查询词典 density of distribution

Results indicated that aphids fed on fresh bamboos by aggregately distributing, and their predators in bamboo forests were separately collected in different parts, main of which were in accord with negative binomial distribution and Polya-Eggenberger distribution, it was proved that some natural enemies in some sample sites were spraying extensively from single plot to around places, the population density of bamboo aphids was proved to be stable in a regular time.

在竹林中主要符合负二项式分布和 P-E 核心分布，为不均匀的聚集分布，存在由点片向四周扩散的现象，频次分析和聚集度指标的分析结果基本一致，其中瓢虫的聚集程度不及另外2种天敌的明显。

Referring to Bessel function,a calculation equation of temperature distribution in the surface and heat-flow density of wax deposit layer in the laminar flow is deduced,as well as temperature distribution inside.

通过对试验环道上测试段相关数据的测试，对比分析测试段管壁有沉积物和无沉积物时测试段管壁内温度分布的不同表达式，根据能量方程建立了无量纲温度分布方程，利用贝赛尔函数推导出原油在层流状态下沉积层表面温度分布、沉积层热流密度、油流温度分布等相关温度场的计算公式，为研究蜡沉积规律，定性分析管路结蜡层厚度和制定合理的清管方案奠定了理论基础。

Secondly, through on-site and laboratory testing, studies the impact of root distribution density and distribution methods to root complex shear strength.

根系的抗拉特性符合一定的规律，对进一步研究根系的拉拔特性奠定基础。

Using assumed explained variable condition, applying the maximum entropy principle and with the condition probability distribution complying with that of sample data and prior distribution, the author finally estimates an optimal conditional probability density of the LGD.

利用假定的解释变量条件，应用最大熵原理，并要求所估计的条件概率分布一致于样本数据和先验分布，最终对违约损失率估计出最佳的条件概率密度。

In this article the usual method of determining the distribution density of function of one-dimensional continuous random variable——distribution function method.

本文给出了求一维连续型随机变量函数分布密度的一般方法：分布函数法，并用分布函数法对现有文献中的计算公式进行了理论探讨，对现有的定理进行修正拓展，扩大了应用范围。

Using this distribution function, the degree of alignment and the distribution density of alignment were described very well.

这一分布函数可为研究和实际生产工艺的改进提供理论指导。

Effects of time, water flux density, and distribution coefficients of metal ions on the migration and concentration distribution of heavy metal ions were also simulated in soil.

分析了时间、水的通量密度、金属离子的吸附分配系数对金属离子在土壤中迁移及浓度分布的影响。

In this paper, nanopowders of rare earth oxides and tungsten were prepared and 0-3 type nano-composit rare earth tungsten thermionic emission materials were fabricated with novel technics. The raw material selection, preparation technic parameter, structure, physical and chemical characteristic, the rare earth distribution and the emission behavior were studied. The influence between the active layer and the thermionic emission performance, rare earth elements diffusion and distribution along depth were investigated in detail. The surplus RE formation and the electron transfer were discussed in theoretically. The thermionic emission current density of the single surplus RE on the active layer was educed. We adopted "liquid-liquid mixing, freeze-drying and two stage-reduction" working step firstly to produce the RE-W nanopowders including La-W powder, Ce-W powder and Y-W powder.

本文采用细化显微组织的新工艺，制备了纳米稀土钨粉末和0-3型纳米复合稀土钨热电子发射材料，探讨研究其原料选择、制备工艺及参数、结构特征、物理和化学特性、稀土分布均匀性、以及热电子发射特性；系统研究了稀土元素的高温扩散情况、高温状态下活性层中稀土的纵向深度分布、以及表面活性物质和活性层厚度对热发射性能的作用；从理论上分析阐释了超额稀土的形成及其电子的传递过程；并从理论上推导了活性层中单个超额稀土的热电子发射电流密度。

Contour density of the temperature distribution in cross-section was different according to distance of the heater. The closer the distance from the electrode, the more intensive the density of isogram was. All isograms exhibited irregular oval shape.

结果显示距离热源不同距离的横截面温度分布等值线密度不同，越接近电极，等值线越密集，且呈不规则椭圆形。

China is the world's population density is one of the countries with high per square kilometer, the average population density of 134 people; but rather a balanced distribution.

中国也是世界上人口密度较高的国家之一，每平方公里的平均人口密度为134人；但分布颇不均衡。

In this paper, the requirement analysis, design and implementation of the system are introduced in detail.

此论文详细介绍了系统的需求分析，系统设计和具体实现。

In the context of economic globalization is increasingly deepening, China's economy can not be spared.

在经济全球化日益加深的背景下，中国经济不可能做到独善其身。