查询词典 question vector

In this paper, based on the analysis of the structure, movement principle and math model of PMSM, fundamental theories of vector control, coordinates transform and algorithm of space vector PWM are introduced and PI control, speed and position calculation methods are discussed.

本论文在分析了PMSM的结构、运动原理及数学模型的基础上，系统地阐述了PMSM交流伺服系统矢量控制的基本原理、坐标变换方法及空间矢量脉冲宽度调制波的生成算法，论述了PI控制算法和速度位置计算方法。

For aeronautical static converter then three-phase unbalanced load, made use of four-leg three-phase main circuit topology solution based on abc coordinates of the three-dimensional vector control, so that the switch to select the vector and duty more than a simple calculation, a significant reduction in the modulation of the complexity of the algorithm.

为解决航空静止变流器在不平衡负载情况下不能正常工作的问题，提出了三相四桥臂主电路拓扑解决方案，并采用基于abc 坐标系下的三维空间矢量调制，使开关矢量的选取和占空比的计算简单化，显著降低了调制算法的复杂性。

Target vector formats are supported by most CAD applications that use vector graphics, such as AutoCAD and Corel Draw.

目标向量格式所支持的最民航处申请使用向量图形，如AutoCAD和Corel的借鉴。

We use vector space model to denote the groups interest and the returning documents into vector {(k1,V2),(k2,v2)...}, then we can calculate the similarity between them using the formula of cosine. The biggest former N pages will be pushed to group.

使用向量空间模型将用户的兴趣以及得到的文档表示成为向量形式{(k1，v2)，(k2，v2)…}，并使用夹角余弦公式计算两者之间的相似度，将相似度最大的前N篇文档推送给用户。

Although direct lethal effects on cotton boll worm couldn't be generated in tobacco plants transformed with cholesterol oxidase full gene vector or mature enzyme gene vector, inhibitory effects on the growth and development of cotton boll worm have been observed to a certain degree.

转单价胆固醇氧化酶全酶基因和成熟酶基因的转基因烟草植株均不能对棉铃虫产生直接的致死作用，但能使棉铃虫的生长发育受到一定程度的抑制。

If Q2 were negative, this might be representation of E2, pointing to negative charge, and if this one (Q3) were negative, then I would have here the contribution E3, and so on, and now we use the superposition principle as we did last time which Coulomb's law, that the net electric field at point p is a vector, is E1 influence of charge Q1, plus the vector E2, plus E3 and so on.

如果Q2是负的，这就是Q2的表示法，方向指向负电荷。如果这个是带负电，它将贡献电场E3，等等。现在我们使用叠加原理，就像我们上次在库伦定律中使用到的。

The cross product of the vector operator with the vector w .

向量算符与向量 w 的外积。

Chapter 2 introduces some propaedeutics of classic differential geometry, which include the first basic form, the second basic form, normal curvature, main curvature, mean curvature, Gauss curvature, unit normal vector, main vector, etc.

第二章介绍一系列的预备知识，主要是关于古典微分几何中第一，第二基本形式的定义，法曲率，主曲率，平均曲率，Gauss曲率，单位法向量，主方向等的定义。

Curvature vector must be orthogonal to the slope vector.

曲率的向量必须和斜率向量垂直 4。

Some uniform formulae are established, which link the Laplacian of the position vector function to the mean curvature vector field on any submanifold in the space forms.

讨论空间型中的位置向量场，建立一组统一的公式，将子流形的平均曲率向量场与位置向量及其衍生函数的Laplacian联系在一起。

A carrier gas such as nitrogen is directed through line 20 and valve 22 to connect with line 26 and mix with the gas sample.

如氮气之类的载体通过管线20和阀22引入，与管线26相通，与气体样品混合。

But for the most part, knaves and parasites had the command of his fortune

然而支配他的家产的大多是恶棍和寄生虫。