矩问题

They concentrate on discussing the dynamic character of the first and second moment of time series. Under normal distribution, the problem of dynamic financial risk measure and elusion can be solved effectively. However, it becomes invalid or is short of effectiveness.

他们的工作主要集中于讨论时间序列的一阶矩和二阶矩的动态性质，能够有效地解决正态分布条件下动态金融风险的测度与规避问题，对于非正态分布条件下相关主题的讨论具有一定的局限性。

There are several problems in the conventional direct torque controlsystem such as large torque-ripple,inconstant inverter switching frequency.

摘 要：传统的直接转矩控制存在转矩脉动大、开关频率不恒定等问题。

The electromagnetic scattering problem is often treated with integral equation and moment of method, and the calculation of matrix element is one of the most important factors that affecting the accuracy and efficiency of method of moment.

电磁散射问题的数值解通常采用积分方程结合矩量法求解，而阻抗矩阵元素的计算是影响矩量法计算精度和效率的重要因素之一。

And the spin-orbital structure of nucleon would shed light on the nucleon spin problem.

而核子磁矩的自旋-轨道结构也对核子磁矩的问题有着重要的启不。

The main problem of direct toque control of a three-level inverter and control technique virtual synthesizing vectors based are demonstrated in detail, also, the method of vector selection is discussed materially.

深入阐述了三电平逆变器直接转矩控制的主要问题及虚拟合成矢量控制方法，详细讨论了三电平逆变器直接转矩控制中的矢量选择方案。

This paper presents a design method of fuzzy PI parameter adaptive con troller in order to settle better the nonlinear problem of parameters ' changing in direct torque control .

为了更好地解决直接转矩控制系统中的变参数非线性问题，提出了一种适用于异步电动机直接转矩控制的模糊参数PI自适应速度调节器的设计方法

Recently,atoms with higher order vanishing moment were defined by Krant-z etc on some particular spaces of homogeneous type,but it hasn't been solvedthoroughly on usual spaces of homogeneous type.On the other hand,krantz'sstudy was made under the condition which the measure of the sets constructedby single element is zero,therefore their work didn't include the case of integ-er Z as a particular space of homogeneous type.Indeed,as a Hardy space on Z,〓(0＜p≤1)has been studied by some scholars.

尽管近来Krantz等人在某些齐型空间上定义了带高阶消失矩的原子，但在一般的齐型空间上建立带高阶消失矩的原子Hardy空间还没有完全解决，而且Krantz等人的工作是在单点集测度为零的条件下讨论的，因而不包括作为齐型空间的整数Z的情形。Z作为一类特殊的齐型空间，其上Hardy空间〓的问题有不少学者讨论过。

As the conventional method of moment has some disadvantages in geometrical modeling and computational work, the high order MoM and bilinear surface technology are used in studying the scattering electromagnetic characteristics of dielectrically coated conducting targets.

针对传统矩量法(method of moment， MoM)几何建模复杂、计算量大等缺点，采用高阶矩量法和双线性表面技术对涂敷目标的电磁散射问题进行了研究。

The author has brought forward new classing manner which is different from the old one. The author also found evaluate target for every type of workshop. The author bring forward the conception of convey rules, and use it as one of the evaluate target. The conception is useful in solving the problem of multi-workpiece workshop layout.

本文提出了与传统分类方式不同的车间分类方式，为每种车间建立了相应的评价指标体系，首次提出了搬运矩概念，并将搬运矩作为一个评价指标列入指标体系中，这就很好的解决了生产多种工件的车间设备布局优化问题。

Based on the analysis of traditional converters, a novel circuit is proposed, what it defers from traditional two switches/phase converter is that it has not dump resistance, and that the rise time and falling time of the phase currents can be effectively reduced, and the torque and output power performance of the system is improved.

在分析了常用的功率变换电路基础上，提出了一种基于双开关功率变换电路的改进电路，该电路与常规双开关功率变换电路的区别在于不需要能耗制动电路，能够利用关断相绕组中储存的能量有效缩短相电流的建立和关断时间，改善SR电机高速运行时输出转矩下降和转矩脉动严重的问题，并且电机的输出功率也得到提高。

In the negative and interrogative forms, of course, this is identical to the non-emphatic forms.

。但是，在否定句或疑问句里，这种带有"do"的方法表达的效果却没有什么强调的意思。

Go down on one's knees;kneel down

屈膝跪下。。。下跪祈祷