查询词典 mean density

In the case of granite, observation results indicate that the extending routes of active cracks are mainly intercrystalline, transcrystalline, inter-transcrystalline, and intracrystalline. When the strain rate is low, the long intercrystalline cracks are prevailing, and with increasing of the strain rate, the short transcrystalline and intracrystalline cracks gradually increase. The statistic results show that the active crack density increases with increasing of the strain rate, and the mean length of active cracks diminishes with increasing of the strain rate, that is, the induced damage in comminuted product increases with increasing of the strain rate. For the first time this dissertation integrates macroscopic results of comminution with active crack growth under impact loading. It elucidates why the dynamic comminution strength of mineral beds increases with increasing of the strain rate through the active crack extending, and analyzes the influence of structure and constitution of minerals on their damage under impact stress. It is authenticated that both the size distribution and the damage population of comminuted product can be characterized by the fractal.

为分析料层颗粒在冲击下的细观损伤效果，采用德国生产的ASM68K半自动图象分析仪对粉碎生成物中的损伤情形进行了观测，以花岗岩为例，观测结果表明花岗岩颗粒在冲击应力下的活化裂纹扩展路径主要表现为沿晶、穿晶、沿穿晶和晶内等形式，在低应变速率下，活化裂纹以沿晶裂纹较多，随着应变速率的提高，其它裂纹形式大量繁衍，统计结果表明活化裂纹密度随着应变速率的增大而增大，活化裂纹的平均长度随着应变速率的增大而减小，综合表现为颗粒的细观损伤程度随着应变速率的增大而增大；首次将应力作用下的活化裂纹演化特征与粉碎的宏观效果相联系，并就料层动态粉碎强度随应变速率增大而提高的现象从裂纹演化特征的角度进行了解释；分析了矿岩构造结构特性对损伤产生和分布的影响。

Census of Crow Pheasant was conducted in Guangdong Haifeng Avian Nature Reserve in 2005. Among four seasons, there were thirty two individuals recorded in summer which was the most. The mean-individual of each line in summer was significantly higher than that in spring and autumn (P.05). The population density in summer was the highest, 17.78 ind./km^2 vs. 1.11 ind./km^2 in winter which was the lowest.

为掌握褐翅鸦鹃在广东海丰鸟类自然保护区的种群现状，提出有针对性的保护措施，2005年对保护区内褐翅鸦鹃数量行了调查。4个季节中，夏季记录的个体数最多（32只），其样线平均个体数与春季、秋季相比，差异性显著(P.05)；夏季种群密度最大，达17.78只／平方公里，冬季仅为1.11只／平方公里。

In addition, the momentum dependence of the nuclear mean field potential has been shown for the first time to be important for isospin diffusion in HIC''s and a explicit expression for the density dependence of the symmetry energy has been obtained by fitting the experimental data.

同时在国际上首次研究了核平均场的动量相关性对重离子碰撞中同位旋弥散的影响，发现核平均场的动量相关性对同位旋弥散有重要的影响。

After adding isospin dependent high order correction terms to existing relativistic mean field models, the density dependence of symmetry energy and the neutron skin thickness S for 208Pb are studied.

在现有的平均场模型中引入同位旋相关的高阶修正项，研究了核物质对称能的密度依赖性和208Pb的中子皮厚度。

The lungs of CDH fetuses were hypoplastic compared with normal controls and had thick walled septa with poorly developed saccules. In contrast, Dex and EGF fetuses showed improved mesenchymal differentiation with well-developed saccules and thin-walled septae, manifested by radial alveolar counts , mean terminal bronchiole density , ratio of pulmonary mesenchyma and that of pulmonary acinuses.

EGF组肺组织形态明显改善，表现在肺泡间隔变薄，肺泡面积所占比例明显增大，轴向腺泡计数较CDH组及Dex组均有明显增加，其平均终末支气管密度较CDH组改善明显，但仍少于正常对照组。

Compared with the diameter and the density of tubular opening, the mean percentage tubular opening area reflects the feature of the pulp cavity wall more comprehensively.

牙本质小管口的相对面积较单纯的牙本质小管口的直径和密度更能全面地反映不同部位髓腔壁的特征。

The mean grain size of W phase in the hot pressed alloy from nanoscaled W-Cu powder is 0.5 μm at 1 200℃, and its relative density is 98%.

纳米W-Cu化学混合粉在H2热压烧结时最大收缩速率对应温度为930℃；1 200℃烧结合金的平均晶粒为0.5 μm，相对密度为98%。

Cynanchum Lingtai apricot production in the average weight 65 grams, the brightly-colored fruit, juicy rich, sweet-sour taste, sweet from the nucleolus, when the late Qing Dynasty famous Shaanxi, Gansu provinces, the Qing imperial court Tongzhi tribute for years.

灵台生产的牛心杏平均单果重65克，果实色泽鲜艳，汁多味浓，甜酸适口，离核仁甜，清末时就驰名陕、甘两省，清同治年间曾为朝廷贡品。

Chenopodium album,Solanum nigrum, and Amaranthus retroflexus were very susceptible to the herbicides. Polygonum persicaria and Abutilon theophrasti were relatively less susceptible to the herbicides, and Lycopersicon esculentum was not susceptible to it. The relationship between reduction rates of weed biomass and PPM values of weed leaves 2,4, and 6 days after treatment was established.

供试的6种杂草对该混剂的敏感性存在显著差异：红心藜Chenopodium album、龙葵Solanum nigrum和反枝苋Amaranthus retroflexus对该混剂最敏感，ED90值分别为47.65、71.67和29.17g/hm2；春蓼Polygonum persicaria和苘麻Abutilon theophrasti敏感，ED90值分别为96.91、114.20g/hm2；而番茄不敏感。