矩

In presented method, the correlated variables are transformed into uncorrelated variables equivalently, and the performance functions in the correlated variables space are transformed into those in the equivalent uncorrelated variables space, in which the reliability sensitivity of the system failure probability with respect to the distribution parameters of the uncorrelated variables can be solved by the moment method for the uncorrelated variables. Finally the equivalent relationship between the correlated variables and the uncorrelated variables, the chain rule for derivative are employed to obtain the reliability sensitivity of the system failure probability with respect to the means of the correlated variables.

在所提的方法中，首先将相关变量空间等效转化为不相关变量空间，并将系统多个失效模式的功能函数转化为不相关变量空间的功能函数，进而利用矩方法得到多模式系统失效概率对不相关变量空间基本分布参数的灵敏度，最后利用相关变量空间与不相关变量空间的等价关系及复合函数求导法则，求得多模式系统失效概率对相关变量空间中变量均值的灵敏度。

This program achieved a DC generator torque characteristic curve, hoping to be useful.

详细说明：此程序实现了直流发电机的转矩特性曲线，希望能有用。

A general calculating method of optical character of optical thin films,namely characteristic matrix method is stated concisely.

胡君简要的叙述了光学薄膜光学特性的通用计算方法，即特征矩阵法。

In the fourth chapter, making the assumption of local charge nonequilibrium and taking energy conservation into account, we ex plained the odd and even multiplicity distributions in different rapidity windows and the anomalous dependence of multiplicity moments on energy in narrow rapidity windows.

第四章用局域电荷不平衡的假设和对能量守恒的考虑很好地解释了不同快度窗口中带电多重数的奇、偶分布和窄快度窗口中多重数矩的反常能量依赖性。

The crown is about 1-2.5m tall and the breadth of the crown is about 1-1.5m. It adapt to grow on high density. 2. The idioplasmic resources of Lonicera fragrantissima are abundant, It can be classified 8 types by the differences of the shape of fruits: cherry shape, drop shape, dumbbell shape, ellipse herringbone shape, inverse egg herringbone shape, chook foot shape, square round herringbone shape, taper herringbone shape; be classified 3 types by the color of fruits: simple red fruit, red fruit and mauve fruit; be classified 4 types by the shape of leaf: roundness, ellipse, egg round, ellipse wrap around leaf.

以果形差异可分为樱桃果型、偏坠状果型、哑铃状果型、椭圆人字状果型、倒卵人字果型、鸡爪状果型和矩圆人字果型、嘲锥人字果型等8个类型；以果色可分为浅红色果类、红色果类和紫红色果类3个类型，以叶形可分为圆形叶类、椭圆形叶类、卵圆形叶类、椭圆披叶形叶类等4个类型，以冠形可分为高于疏枝冠形类、下垂密枝低冠形类和中高干密枝冠形类等3个类型，根据各类型特点选择鲜果食用类、饮料栽培类、露地观赏类、插花观赏类、盆景观赏类和药用栽培类等一批优树。

Study on plant disease recognition using support vector machine and chromaticity moments.

支持向量机和色度矩的植物病害识别研究。

Digital image correlation method ; circular window ; moment character

数字图像相关方法；圆形窗口；矩特征

And the matching point pairs are obtained by comparing the Euclidean distance of the Zernike moments,which are computed around a circular neighborhood centered at the feature point.Then the transform parameters are computed through the correct mapping model.Finally,the weighed average method is used to achieve image mosaic.

该算法利用曲率尺度空间角点检测法提取特征点，通过比较各特征点圆形邻域Zernike矩的欧式距离得到匹配点对，然后利用正确的映射模型计算出变换参数，最后采用加权平均法得到图像的拼接结果。

Researches show that the drive force characteristics of the electric tractor drive system based on series DC motor is close the ideal characteristics, the curves are concave, low speed with constant power, and high speed with constant torque; the electric tractor has large working speed under different shifts, but the extensive coincidence speed shows that the variable ratio of the gear is unreasonable; the maximum climbable gradient of this electric tractor is more than 30%, and does not need frequent shift when working for its extensive climbable gradient; there are many influence factors of continuous working time, which the more obvious factors are working speed and working load, the working time increases with the increase of the working speed and working load.2. Simulation researches on the drive characteristic of the electric tractor.

研究结果表明：基于串励直流电动机(来源：ABC21论文网www.abclunwen.com)的电动拖拉机电驱动系统的驱动力特性场接近理想驱动力特性场，其各挡下的驱动力特性是一组下凹的曲线，低速恒转矩，高速恒功率；同一行驶速度下所对应高挡驱动力大于低挡驱动力，这是由电机的调速特性决定的；电动拖拉机各个挡位下具有较广的稳定作业速度范围，但是各个挡位之间速度重合的范围较多，说明所用变速箱变速比与电动机匹配不合理；电动拖拉机最大爬坡度达到30%以上，并且各挡爬坡度变化范围较广，作业过程中不需要频繁换挡；影响电动拖拉机连续作业时间的因素较多，其中作业行驶速度和作业负荷影响最为明显，作业负荷越大，连续作业时间就越短，作业速度越快，连续作业时间就越短。2、电动拖拉机驱动特性仿真研究。

LIU Hong believes that the current university campus architecture Founder and closed most of the space experience of a single, too law-abiding.

刘弘认为，目前国内的大学校园建筑大多方正而且封闭，空间体验单一，过于中规中矩。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。