平均密度

At the same time, the practical implementation of evolutionary algorithm is given in order that evolutionary algorithm is introduced into vector quantizer. In the fourth section the asymptotic theory of vector quantization is studied. Then the partial distortion theorem that when codebook size is large enough, each region of the partition makes an equal contribution to the distortion for an optimal quantizer, which is the key part of vector quantizer is obtained. Finally, the competitive learning algorithm based on the partial distortion theorem is proposed, which introduces the subdistortion of each region into the distortion measure to assure that the subdistortion of each region approximately equals to each other.

第四章详细研究矢量量化的渐近理论，然后得出了矢量量化器设计的核心部分——部分失真定理，当码本尺寸足够大且输出矢量的渐近概率密度与输入矢量的概率密度的幂成比例时，最优量化器划分的各个区域对该量化器的平均误差产生相同的影响，最后提出基于部分失真定理的竞争学习算法，它通过在误差测度中，引入与各区域相关的子误差以保证各区域的子误差近似相等，该算法实现较为简单，在一定程度上确保全局最优。

The average optical density that benefit measures organization of different period hemangioma and normal skin to organize Cyclin G1 and P53 expression with technology of computer image analysis and average and electropositive area.

利用计算机图像分析技术测量不同时期血管瘤组织和正常皮肤组织Cyclin G1和p53表达的平均光密度和平均阳性面积。

The results showed that 1 the tar delivery was reduced on an average of 0.1mg per cigarette when the density of tobacco rod was decreased by 1mg/cm3, 2 the tar delivery was reduced on an average of 0.3mg per cigarette when the ratio of draw resistance of filter tip to that of whole cigarette was increased by 1%, and 3 the tar delivery was reduced on an average of 1.1mg per cigarette by use of the both techniques.

结果表明：烟支密度每降低1mg/cm3，卷烟焦油量平均可降低约0.1mg/支；滤嘴吸阻占卷烟吸阻的比例每提高1%，焦油量平均降低0.3mg/支左右。综合运用上述2种稳定和降低卷烟焦油量的措施，使"群英会"牌系列产品的焦油量平均值下降了1.1mg/支，焦油量稳定在设计值±1mg/支以内。

2Particle numeral density distributing law of the system not only bear on and average speed and seat gravitational potential energy of system,but also bear on grads of temperature and speed about distance of system,at one time,it bears on whole spore speed of system.

本文详细的分析了地球大气系统粒子的数密度的分布规律，从中发现：(1)该系统的平衡条件有别于一般热力学系统的平衡条件；(2)该系统粒子数密度分布规律不仅与系统粒子的平均速度和所在处的重力势能有关，而且还与系统的温度和速度的距离梯度有关，也与系统的整体运动速度有关。

Average optical and average gray scale can be used to describe the differences between the groups.

平均光密度和平均灰度可用于各组间差异的描述。

The metrics include patch density, largest patch index, edge density, area-weighted shape index distribution, area- weighted fractal index distribution, mean Euclidean nearest neighbor distance dlstributlon,standard deviation of Euclidean nearest neighbor distance distribution, coefficients of variation of Euclidean nearest neighbor distance distribution, contagion, interspersion and juxtaposition index, cohesion, Shannon's diversity index and Simpson's diversity index.

根据生态区划计算描述中国陆地景观结构的13种景观结构指数，包括斑块密度、最大斑块指数、边界密度、面积加权斑块形状指数、面积加权斑块分维度、平均最近斑块距离、最近斑块距离的标准差、最近斑块距离的相异系数、蔓延度、分布邻接指数、结合度、香农多样性指数、辛普森多样性指数。

The average electron density in the linear attenuation zone is about 10^-5 of neutral particle density, and can diffuse over a wide rarea, The conclusion will supply some valuable references to the research of electromagnetic wave and artificial plasma interaction, the plasma invisibleness research of missile and special aerocraft,and the design of artificial plasma source.

平缓衰减区中的平均电子密度约为中性分子密度的十万分之一。并且可以覆盖较大范围。这些结果对于电磁波与人工等离子体相互作用的研究、导弹和空间飞行器的等离子体隐身研究及人工等离子体发生器的设计有一定的参考价值。

Moreover, simulation results show that it has a better performance in terms of the probability density functions of the envelope and phase, the level crossing rate, and the average fade duration than the previous methods.

仿真结果表明，改进后的方法生成的复随机过程的幅度、相位的概率密度函数及平均电平通过率、平均衰落持续时间能更好地逼近理论参考值。

Results of stepwise discriminant analysis indicated that at Datang the key factors affecting habitat use by hoolock gibbons in spring were two factors, and that there were three factors (distance to open field, average height of bamboo and liane density) impacting habitat use by hoolock gibbons between Nankang and Datang in spring.

判别分析结果显示，在大塘影响白眉长臂猿春季生境利用的关键因子是藤本密度和坡度2个因子；影响赧亢与大塘白眉长臂猿的则是距空旷地距离、竹子平均高度和藤本密度等3个因子。

L , Tuandao (293.95 ind./L), Huangdao (283.7 ind./L) and Nautical School (107.23 ind./L).5 At the Nautical School Sampling Station (24 hour monitoring station), the highest average density of microzooplankton was recorded at sunset (154.91 ind./L), successively, at sunrise (146.63 ind./L) and noon (93.09 ind./L), the lowest was at midnight (77.31 ind./L).6 Protozoa and copepod nauplius were the most dominant groups , comprising more than 90% of the total abundance of microzooplankton.7 In comparison with other gulf waters in the world, densities of microzooplankton and loricate ciliates in Jiaozhou Bay were at intermediate level.

在航校昼夜监测站，小型浮游动物的平均丰度以傍晚最高，其次是黎明和正午，午夜时密度最低，分别为154.91个／升、146.63个／升、93.09个／升和77.31个／升。6、胶州湾小型浮游动物以原生动物和无节幼体为主，两者共占小型浮游动物总数的90％以上。7、与世界其它海湾水域相比，胶州湾小型浮游动物的总平均丰度和砂壳纤毛虫的丰度，处丁中等水乎。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。