three-dimensional vector

Research on the System Simulation of the Three-Phase Rectifier Based on Voltage Space-Vector

电压空间矢量三相整流器系统仿真的研究

It is hard to draw in two dimensions a picture a vector function in three-dimensional space.

在两维图上画三维空间的矢函数图形是件难事.

An all-digital vector control system of three-phase induction motor is presented.

提出了一种全数字式的三相异步电机矢量控制系统。

Analysis and Design of a Three-phase Voltage Source Rectifier Based on an Improved Vector Control Scheme

基于改进矢量控制的三相电压型整流器的系统分析和设计

Based on the three-dimensional space vector of Pb isotopic mapping, it is indicated that there exist a isotopic geochemical steep zone along Luonan-Luanchuan-Fangcheng faults between north Qinling and north China block.

Pb同位素比值三维空间矢量填图结果表明，在华北块体与北秦岭之间，沿洛南-栾川-方城断裂存在明显的地球化学急变带，分隔具有不同Pb同位素空间矢量组成的华北与北秦岭块体。

The method is equivalent to the three-dimensional space vector PWM method, but its implementation is much easier.

这种改进的调制方式等效于三维空间矢量调制方式，且容易实现。

The form of the array is a uniform vertical pressure sensor array, in whose center there is one three-dimensional vector hydrophone. By this combination array, the three-dimensional parameters of the near-field sources including the azimuth angle, the elevation angle and the distance can be achieved.

该算法采用均匀垂直声压阵中心配置单只三维矢量水听器的基阵形式，即可完成对近场源方位角、俯仰角和距离的三维参数估计。

Invariance of Maxwell Equations with Three-dimensional Vector Forms

三维矢量形式的麦克斯韦方程组的协变性

The mathematical model of steam vane is established with 2 × 3 degree nurbs method to improve the quality and efficiency of vane machining. The expression of three-dimensional point and unit vector matrix are put forward and the numeric show of vane is realized.

为了提高汽轮机叶片数控加工的质量和效率，用2×3次非均匀有理B样条方法，建立了叶片的数学模型，推导了其三维点和法矢量矩阵表达式，实现了叶片的数字化表示。

Experimental Research on Three-dimensional Fiber Optic Vector Hydrophone Based on Acceleration Sensing

基于加速度传感的三维光纤矢量水听器实验研究

At first, the three-dimensional vector potential and vorticity function are introduced, and the vector potential and vorticity equations are obtained in the case of arbitrary variation between density and temperature of water.

本文应用三维矢量势和涡函数，导出了水的密度和温度之间任意变化情况下的矢量势和涡方程。

With the application of field theories, processing methods of the power function, dam theories and engineering mechanics and three-dimensional vector, there is created space displacement field distribution model.

从场论的基本理论出发，应用幂函数处理方法，并结合坝工理论和工程力学知识，通过引用空间三维坐标向量，建立空间位移场的时空分布模型。

To study the quantitative structure-activity relationship ( QSAR) of 33 nevirapine derivatives as anti-HIV drug, a newly developed three-dimensional holographic vector of atomic interaction field ( 3D-HoVAIF) was used to describe the chemical structure of anti-HIV drug-33 nevirapine derivatives.

运用三维全息原子场作用矢量（3D-HoVAIF）对33个Nevirapine类抗艾滋病药物进行了定量构效关系（QSAR）研究。

Three-Dimensional Vector Velocity Measurement in Optical Doppler Tomography

光学多普勒层析三维矢量测速方法研究

A three-dimensional vector, which consists of the β of bispectrum, Shannon entropy, and wave crest factor is the sensitive eigenvector for faulty insulator.

双谱幅值特征量β、波峰因子、Shannon熵组成的三维向量是绝缘子劣化的敏感特征向量。

Based on previous research in synergetic neural network, the construction methods of three-dimensional image's prototype vector, three-dimensional pixels spread out method and Projection section method are proposed In the paper. And the optimization of Projection section method is given also.

基于前人在协同神经网络的相关研究，本文提出了立体图像的原型向量的构造方法&立体像素平铺法和投影截面法，并给出了投影截面法的优化方法。

In order to combine the advantages of 2D vector data and 3D terrain data, the research of the GIS based on the blended data is becoming hot, while the key issue is the data integration and real-time rendering between the 2D vector data and three-dimensional terrain.

为了同时拥有二者的优点，基于混合数据的地理信息系统逐渐成为研究的热点，它的关键问题就是二维矢量数据与三维地形数据之间的融合及实时渲染。

A submerged buoy system for ocean vector sound field measurement is designed with the three-dimensional vector sensor as a core.

以三维矢量传感器为核心，构建海洋矢量声场观测潜标系统。

Rank-1 ambiguity involved in three-dimensional vector sensor

三维正交矢量天线导向矢量的秩-1模糊

The principle and digital control algorithm of three-dimensional space vector modulation, based on the a-b-c coordinate, therefore, are described in details.

详细介绍了基于a-b-c坐标系的三维空间矢量调制的原理和数字控制算法实现。

In this paper, expressions for the nine coefficients ( Euler's angles) of a three-dimensional vector during coordinate transformation have been derived by means of vector resolution;

本文利用向量分解的方法导出三维向量在座标转换中的九个系数（欧拉角）的表达式；

This paper focus on the map projection and coordinate system, multi-scale vector data on the sphere of expression, vector data in the symbolic by three-dimensional API and do some systemic analysis, discussion and testing.

重点对地图投影及坐标系、多比例尺矢量数据在球面上的表达、矢量数据在三维API中的符号化进行了较为系统的分析、论述和试验。

Conformal mapping with special boundary conditions to solve the electrostatic fields, electric potential field in three-dimensional space using the inverse radius vector method gives power to deal with such issues as law and the strict mathematical solution. 3.

保角变换解决具有特殊边界条件的静电场问题，利用三维空间场电势的逆矢径方法给出电像法以及处理此类问题的严格数学解法。

The study on miniaturization of three-dimensional co-vibrating spherical vector hydrophone

三维同振球形矢量水听器的小型化研究

Unity Power Factor Three-Phase Rectifier Based on Voltage Space-Vector Pulse-Width Modulation

基于电压空间矢量调制的单位功率因数三相整流器的研究

Aiming at data sets of three-dimensional steady vector fields with irregular structured grids, this dissertation studies on the visualization techniques of streamline.

针对不规则结构化网格的三维定常矢量场数据，对流线可视化技术进行研究。

According to the three-dimensional continuity of subsurface space and requirements of interactive modification and analysis in the process of modeling, an new three-dimensional vector data model for subsurface modeling is proposed.

针对地下空间的真三维连续特性以及地下建模过程的动态交互编辑与分析要求，提出了一种新的三维地下空间矢量数据模型。该模型采用面向对象思想对地下各种空间对象进行抽象描述；

Study on the algorithm and simulation of three-dimensional space vector pulse-width modulation

三维空间矢量PWM调制算法及其仿真研究

The winding group analysis of three-phase transformer based on the voltage vector

基于电压相量的三相变压器组别判定方法