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.

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。

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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。

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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。

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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。

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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

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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。

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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。

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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。

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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；

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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。

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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

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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

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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。

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This text utilizes finite element method set up slope rock deep hole blasting models of some power station, use three-dimensional finite element entity unit model, and make time history analysis when going on of blasting earthquake.

并利用有限元方法建立了边坡岩石深孔爆破模型，爆破地震的产生过程进行模拟，获得距爆孔一定距离范围内岩体某点的加速度时程曲线，即取得了爆破地震波。

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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。

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The dynamic characteristics analysis is made for the derrick structure of the offshore drilling rig in some well drilling companies. This paper mainly deals with simulation and stability analysis and simplifies each member as three-dimensional beam unit with finite element method.

对在役海洋石油钻机井架进行了结构动力特性分析，并采用有限元法将钻机井架各杆件简化为空间梁单元，对钻机井架三维计算模型进行了离散，给出了模态分析和稳定性分析结果。

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In this paper, the analytic representation question of that two three-dimensional projective pictorial illustration turn into perspective is investigated, on the fundation of the result and result, the some important conclusion have been got.

本文在高、唐研究成果〔1〕、〔2〕的基础上，探讨了两个三维射影图形成透射的解析表示问题，得到了一些重要结论。

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The Three-Dimensional Turn of Marxist Study of Humanity

马克思主义人学的三重转向

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The method of three optical channels is used to design the optical system. The key technologies of multi-threading, video collecting, image processing and the control of single-chip microcontroller and stepping motors are used to realize three-dimensional real time automatic tracking of pupil.

采用先进的三光路设计方法实现光学系统的设计，采用多线程、视频捕捉、图像处理、单片机及步进电机的控制等关键技术，实现了瞳孔的三维实时自动跟踪。

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The system provides a hardware platform not only for real-time measurements of the relative position between ships and offshore platforms, but also for achieving the goal of identifying and calculating three-dimensional position during vessel tracking process.

该系统为船舶与海洋平台间相对位置的实时测量，以及在船舶跟踪过程中实现对跟踪目标的识别及三维位置的计算提供了硬件平台。

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