平均值

Most of them rely on the central limit theorem, that states that the mean of N independent realizations of a random variable with mean u and variance d^2 approaches a normal distribution with mean u and variance d^2/N .

在蒙特卡罗评估框架内大量的各种选择性算法已经被推出，他们中的大部分依赖于中心极限定理，一个均值为U方差为D^2的随机变量的N次独立实现的平均值接近于一个均值为U方差为D^2/N的正态分布。

According to that characteristic and based on the differential equation of the deformed surface of the orthotropic plate, with one principal direction size fixed, changing another principal direction size linearly, maintaining elasticity coefficient the same as in the first principal direction and Poisson ratio equal to the geometric mean of two principal Poisson ratios, the original orthogonal plate is equivalent to an isotropic plate. Results obtained show that the deflections of the equivalent isotropic plate are the same as the deflections of the original orthotropic plate at the corresponding points, the forces of the correspondent points have simple relations.

根据这一特性、从正交各向异性板挠曲面的偏微分方程出发，保持一个主方向尺寸不变，另一主方向的尺寸做线性缩放，保持弹性模量与第一主方向相同，泊松比取2个主方向泊松比的几何平均值，将这类正交各向异性板等效为一块各向同性板；通过分析得到：各向同性板任意点的挠度就是原正交各向异性板对应点的挠度，各对应点内力之间存在简单的比例关系，该文的方法将为工程技术人员提供方便，同时可以更加直观的认识正交各向异性板的受力。

Calculation of ride index and statistic characteristic is the core.

依据采集到的试验数据进行动力学性能指标——平稳性指标的计算和求取各信号的最大值和最大平均值是试验数据处理的主要工作之一。

Stand on a base of upper study, this paper choose distribution map of agriculture and stock raising in seven different historical age as basic material, sum up ten agro-geology environmental factors into Loess plateau Area's AEG system, and cover all these factor's component parts map on distribution draft of every period's agricultural and pastrol, then measure the occupying proportion, bring results into fomula of factor information entropy, finally, take average value of ten factor's information entropy in each period as its characteristical AEG system entropy value.

在以上研究的基础上，论文选择黄土高原地区七个历史时期的农牧业分布图作为基本资料，将该区的十个地质环境要素纳入农业环境地质系统中，将其类别分布图与上述农牧业分布图进行叠加量测，结果代入要素系统熵计算公式，求得了十个农业地质环境要素在各个历史时期中的系统熵，对每个历史时期的这十个熵值求算术平均值就获得了该历史时期黄土高原地区总的农业环境地质系统熵。

A receiver extracts the bit of watermark data from the selected bit position of the average value of the chrominance portion.

接收机从色度部分的平均值的选择比特位置中提取水印数据的比特。

The concentrations of 17 - KS of 6 to 7 years old normal boys was measured withbiochemistery method, and the relationship between the concentration of 17 - KS and ado-lescence was studied. The concentration of 17 - KS increased with chronological and skeletal age.

我们用生化法对6～17岁男学生17—KS的含量进行了测定，并对17—KS与男性青春期发育的关系作了初步探讨。17—KS含量随年龄、骨龄的增加而增加，平均值为10.96mg/24h。

In theory, kinetic theory of gases with classical mechanics and statistical methods based on the thermal motion and interaction to make the appropriate simplifying assumptions, gives molecular modeling and collision mechanisms, using probability theory dealing with a large number of elements of collective behavior, characterized by the collective movement find the statistical average value.

理论上，气体动理论以经典力学和统计方法为基础，对热运动及相互作用做适当的简化假设，给出分子模型和碰撞机制，借助概率理论处理大量分子的集体行为，求出表征集体运动的统计平均值。

The results were as follow: At fine, cloudlet and cloud weather in rainy season,the mean value of CO 2 content varied in a range of 349 to 350ml/m\+3 at 2.8m above the canopy, 346 to 348ml/m\+3 at 0.8m above the canopy, 345 to 349ml/m\+3 at 16m inner the forest and 352 to 357ml/m\+3 at 5m above ground in the period from 9:00 to 18:00.The CO 2 content in rainy season was lower than that in dry season. At the same weather and space-time, CO 2 content in rainy season was higher than that of CO 2 in dry season at both day and night. According to the grads calculation, there were the CO 2 flux from atmosphere to canopy with 0.61×10 -6 and 0.71×10 -6kg/(m 2·s) during day time in dry and rainy seasons respectively.

采用梯度法及CI-301PS CO2系统，实现了海南尖峰岭热带山地雨林近冠层CO 2、微气象因子梯度观测研究，结果表明：雨季晴、晴间少云及多云天气，9：00～18：00CO 2浓度平均值分别在349～350ml/m3(冠上2.8m)、346～348ml/m3(冠上0.8m)、345～349ml/m3(林内16m)、352～357ml/m3(林内5m)，较旱季相应天气分别小14～17.5、10.1～23.7、1 6.4～35.7和18.1～36.1ml/m3；1：00～8：00，则雨季CO2浓度大于旱季；梯度浓度廓变量和实时动力计算反映出，8：00～18：00CO2通量由大气向林冠层，旱、雨季平均CO2通量分别为0.61×10-6kg/(m2·s和0.71×10-6kg/(m 2·s)，19：00通量甚微，20：00～7：00CO2通量则由林冠向大气，平均CO2通量分别为0.36×10-6kg/(m2·s)和0.32×10-6kg/(m2·s)；雨季昼夜大气流向冠层的净CO2通量是相应旱季的1.56倍。

In this paper, an improved codeword searching algorithm is proposed on the basis of nearest-neighbor search algorithm. The new algorithm considers the sums and variances of image vectors.

摘要该文利用图像矢量的平均值和方差，结合了最近邻域搜索算法，构造了一种新的快速矢量量化编码算法。

Available test results and calculations include tear, static and dynamic coefficient of friction, average peel/tear, load displacement at first peak, energy at first peak, energy between limits, peel length and more.

提供的试验结果及计算包括：撕裂、动态和静态摩擦系数、剥离/撕裂平均值、第一个峰值处的载荷和位移、第一个峰值处的能量、极限之间的能量、剥离长度等。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。