矩

Using three moment invariants describing 3-D object reduces data greatly in the model database, this provides a potential solution to 3-D object recognition in arbitrary view.

用三维不变矩来表示三维物体可以极大地减少模型库中的数据量，为从根本上解决任意角度三维目标识别问题提供了潜在的希望。

A current based hybrid method combining the MOM with the Kirchhoff approximation for analysis of scattering interaction between a two-dimensional infinitely long conducting target with arbitrary cross section and a 1-D rough sea surface with PM spectrum is proposed.

利用基于电流计算的矩量法结合高频算法基尔霍夫近似的混合算法，分析了一维PM谱粗糙海面及其上方二维无限长任意截面导体目标的双站复合电磁散射特性。

Two improvements measurements pointed to the errors to calculating b values have been proposed:(1) to adopt the uniform absolute magnitude scale, seismic moment magnitude MW,(2) to discard the magnitude points for which the earthquakes absent and lose, and then to compute the b value using least square method to fit the data.

针对过去计算b值的误差，提出了两条改进措施：（1）采用统一的绝对震级标度-矩震级标度MW；（2）舍弃缺失地震次数的点，然后用最小二乘拟合求得b值，使b值计算较准确。

The geometries, electronic structures, one- and two-photon absorption spectra for a series of dendritic molecules have been studied.

与偶极矩化合物相比，八极矩分子具有更高的透明性和更大的双光子吸收截面，是更有前途的双光子吸收材料。

Throughout comparing the above estimating methods, we have the following results: the estimators of the moments of the errors does not depend on the random effects, and that of the random effects does not depend on the errors, and then the corresponding asymptotic variances are very simple and optimal; when the random effects are multivariate, we can not construct different estimating equations for the random effects and errors respectively, which results that the asymptotic covariances of estimation are very complex and then the estimating efficiency is bad.

比较上述两种估计法，我们发现：当随机效应是一维的时侯，误差的各阶矩的估计不依赖不可观测的随机效应，随机效应的估计也不依赖误差，因此，估计的渐近方差结构特别简单也是最优的；而当随机效应是多维的，因为随机效应的协变量的影响，我们没有办法针对随机效应和误差的各阶矩分别建立估计方程，这导致所得的估计的渐近方差或者协方差矩阵特别复杂，从而估计的效果不是很好。

The results show that the number of the squeezed atomic dipoles is decided by the coherence of the atom, the direction of the quantum information entropy squeezing is decided by the phases of the field and the atom, and the quantum information entropy squeezing is a precision tool for the squeezing of the atom, especially when the atom is in the eigenstates of the dipole operators.

结果表明：原子偶极矩分量出现信息熵压缩的数目依赖于原子的分布角；信息熵压缩的方向由原子和场的位相决定；量子信息熵是原子压缩的精密量度工具，尤其适合于原子处在偶极矩算符的本征态时压缩情况的描述。

This paper proposes a new startup and low speed control strategies which are used in direct torque control of induction motor.

针对直接转矩控制的异步电机的起动和低速运行的方法，本文提出了间接转矩控制的方法。

Based on a certain typical kind of communication and command armored car, a method of complicated face meshing by the MOM is proposed and the text file with Visual LISP language embedded in AutoCAD is dealt with.

以具有典型性的某型通信指挥车为载体，提出了一种基于矩量法的网格划分算法，并利用内嵌于Auto-CAD的Visual LISP语言，对划分后的数据文件进行操作，实现了通信指挥车的单元网格显示，通过可视化对象直观地判断网格划分是否满足矩量法的基本要求，并及时进行纠错处理，最后给出了采用该算法对通信指挥车进行三角形、矩形网格划分后的实例显示。

However, due to its complexity, there exist few fast algorithms for computing Legendre moments, which limits its application.

然而，由于正交矩的复杂性，目前有关正交矩快速算法的研究很少，从而在一定程度上影响了它的应用。

In this paper,on the basis of representing images with blocks,we present two algorithms,cumulative method and integral method,for fast and effective computation of the two-dimensional Legendre moments.

这两种方法都有效地降低了计算复杂度，缩短了计算时间。1 引言自从Hu[1] 提出矩的不变量以来，矩在模式识别、图像分析等许多领域都有广泛的应用。

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。