矢量

Beginning from the electromotor common control theory, this paper discuss basic concept of AC motor with vector control.

以电动机统一控制理论为切入点，论述了交流电动机矢量控制基本概念。

A novel atomic electronegative distance vector is developed to express the chemical environment of various chemically equivalent carbon atoms in androsterones .

提出以5元素构建原子电性距离矢量，描述雄甾酮化合物中不同等价碳原子的化学环境。

The problem can be favorably solved, because some specific equations are discovered. Next, by using vector eliminant method which is found in the paper, the forward displacement analysis of 5-5b general platform parallel mechanism is studied.

接着，在建立了一种矢量消元方法的基础上，又对5—5b台体型并联机构位置正解问题进行了研究，得到了不含增根的输入输出方程。

The methods that the orientation of PMD vector is determined by PMD ellipsoid are provided.

分析了如何从偏振度椭球的长轴判断偏振模色散矢量的方向。

An exact solution of the scattering by a chiral elliptic cylinder is obtained in terms of Mathieu function and modified Mathieu functions by means of vector wave functions.

对旋波媒质的电磁特性进行分析，基于边界值问题，借助于矢量波函数，首次给出了旋波媒质椭圆柱电磁散射问题的解析形式解。

Making use of the space vector method, this article sets up two coordinate numeric control grinding motion model of elliptic taper piston, and researches on the law of error compensation for the systematic motion after dressing grinding wheel.

用空间矢量方法建立了椭圆锥体活塞的两坐标数控磨削运动模型，研究了砂轮修整后应对系统运动进行的误差补偿规律。

When the end of the electric field vector travels in an ellipse, the light is elliptically polarized

电场矢量的末端沿一椭圆移动的光叫椭圆偏振光。

When the end of the electric field vector travels in an ellipse, the light is elliptically polarize d

电场矢量的末端沿一椭圆移动的光叫椭圆偏振光。

EMC and EMI is one of the most aspect in designing of a control system.

在此基础上，建立了该电机的矢量控制系统，给出了初步的实验结果，为以后更进一步的研究打下了基础。

By using the CFD software FLUENT, the inner-flow field of centrifugal fans with ruled-surface impeller versus with enveloping surface impeller has been simulated. The static pressure distribution, the dynamic pressure distribution, the total pressure distribution, the turbulent intensity and the speed vector of the two kinds of centrifugal fans are then analyzed and compared. From the calculating results, we found that the pressure distribution, the speed vector and other parameters of the two kinds of centrifugal fans are basically same. This implies that the tool-path generating arithmetic for the machining of the impeller can meet the aerodynamic requirements of the centrifugal fan. Furthermore the method can provide proof for designing department to establish sound manufacturing tolerance for impeller.

最后采用CFD软件FLUENT，利用标准k-ε湍流模型，采用分离隐式求解器，分别对直纹面叶轮离心通风机和包络面叶轮离心通风机整体风机内部三维流场和单个通道流场进行了数值模拟计算，在计算结果的后处理中，对相同坐标值处的静压力、动压力、湍流强度和速度矢量等参数进行了分析与比较，结果表明：在相同的计算参数条件下所得到直纹面叶轮离心通风机和包络面叶轮离心通风机内部流场差别不大，从而揭示所采用的叶轮数控加工的刀位规划方法的规划误差对流体机械动力性能的影响不大，这也为设计部门制定合理的叶轮加工公差提供了依据。

We have no common name for a mime of Sophron or Xenarchus and a Socratic Conversation; and we should still be without one even if the imitation in the two instances were in trimeters or elegiacs or some other kind of verse--though it is the way with people to tack on 'poet' to the name of a metre, and talk of elegiac-poets and epic-poets, thinking that they call them poets not by reason of the imitative nature of their work, but indiscriminately by reason of the metre they write in.

索夫农 、森那库斯和苏格拉底式的对话采用的模仿没有一个公共的名称；三音步诗、挽歌体或其他类型的诗的模仿也没有——人们把&诗人&这一名词和格律名称结合到一起，称之为挽歌体诗人或者史诗诗人，他们被称为诗人，似乎只是因为遵守格律写作，而非他们作品的模仿本质。

The relationship between communicative competence and grammar teaching should be that of the ends and the means.

交际能力和语法的关系应该是目标与途径的关系。