曲线角

Third,argument-polar radius curve of polar coordinate system whose pole is geometric gravity is formed,and maximum and minimum value points are searched.

然后以重心为极点，对边缘点极坐标化，形成幅角-极径曲线，在该曲线上寻找局部极大极小值点。

For some particular casesof boundary-value problems such as the problems with curvilinear boundariesor a sharp re-entrant corner,the B-FEM in curvilinear coordinates will givequite fine results.

对一些特殊问题，如曲线边界问题、尖角奇异性问题等，在曲线坐标系中建立的B样条有限元法，具有良好的计算效果。

It is found that there exists an obvious prepeak in the low-Q domain (Q=15.7 nm^-^1) of the structure factor. In the X-diffraction pattern, the liquid diffraction curve is corresponding with the solid diffraction curve. There exist the prepeaks for them in the low-Q domain, which shows that there is the comparability in the microstructure between them.

采用紧束缚原子间作用势，利用分子动力学模拟的方法研究了Al5Fe2合金熔体的微观结构，发现在结构因子的小角部分(Q=15.7nm^-^1)出现了一个明显的预峰，并得到X射线衍射实验的进一步印证，在实验测得的合金衍射图样中，液态衍射曲线与固态衍射曲线间存在着很好的对应关系，它们在小角部分都存在峰位，这表明Al5Fe2合金熔体与其固态在结构上存在着很大的相似性。

A curve that cuts all of a given family of curves or surfaces at the same angle .

常角轨道，轨线以同样的角度切割给定系统所有曲线或平面的曲线

The divergence angle is calculated based on geometry characteristics of two facula curves detected at the different positions to the laser. Facula curves are gained through scanning by two hemicycle probes which have different radius.

该方法以激光光束传输到不同距离处的2条光斑外缘曲线的几何特征为基础来求LD的发散角，而2条光斑外缘曲线分别由2个半径不同的半圆环探头的旋转扫描探测获得。

In this paper it is given a more effective formula about the direction angle of the main plane in the plane stress state.2. To introduce the principle and method for drawing 3-D graph with the compuer and for checking up with the computer cursor,to give outline of expressions of 3-D curve,outline of cursor meterage of well depth,well deflection angle and direction angle at any section.

介绍了在实践中总结出的计算机绘制与光标检测3维图形的原理和方法，给出了3维动态图形到屏幕坐标的变换式、各测点的平滑连接方法以及描绘与检测井眼轨迹曲线的典型应用，实现了空间井眼轨迹曲线的任意旋转、投影和给出了任一井段的井深、井斜角和方位角的光标检测软件。

In this chapter, three kinds of target recognition methods are performed, which are:①Target recognition method based on the description of polarization parameter plane. The echo polarization states of target are projected onto the polarization state plane described by the ellipticity ε and the tilt angle τ of the polarization ellipse, the change of parameter following ferquency becomes the chart. According to the changing trait of the chart, the multidimensional polarization feature space of target has been contructed. Furthermore, a series of polarization feature parameters used in designing the structure of target recognition device are extracted, and they are insensible to the posture of target.②Target recognition method based on the description of Poincare polarization sphere. The echo polarization states of target expressed by Stokes vector are projected onto the Poincare polarization sphere. The conception of polarization ferquency stability, which is used in describing the dynamic distribution characteristics of the target echo polarization states on Poincare polarization sphere, has been defined. A group of polarization feature parameters used in designing the structure of target recognition device are extracted, and they are insensible to the posture of target.③Target recognition method based on the description of frequency sensitivity. In accordance with the conception of the polarization state distance defined on Poincare polarization sphere, the frequency sensibility of the physical structure property of target has been investigated, the frequency distribution feature curves in PSD domain are obtained, and targets'features are extracted by means of the curve-fitting method with Least Square Criterion.

这章具体研究了基于三种极化散射特性描述的相应的目标识别方法：①基于极化参数平面描述的目标识别方法，将目标回波极化状态投影到以极化椭圆参数，即椭圆率角ε和倾角τ表征的极化状态平面上，参数随观测频率的变化就形成了图，根据图的变化特点构造了目标的多维极化特征空间，并提取了不敏感目标姿态变化的极化特征参数组来设计目标的识别器结构；②基于Poincare极化球面描述的目标识别方法，采用Stokes矢量表征目标回波的极化状态，并将其投影到描述极化状态的Poincare极化球面上，定义了极化频率稳定度的概念用以刻画目标回波极化状态在Poincare极化球面上的动态分布信息，提取了准方位不变性的目标极化特征，最后设计了目标的识别器结构；③基于频率敏感性描述的目标识别方法，通过在Poincare极化球面上所定义的极化状态距离的概念，研究的是复杂目标物理结构特性对探测信号频率的敏感程度问题，获得了在极化状态距离下的频率分布特性曲线，采用最小二乘估计曲线拟合方法，它既用于极化特征的降维，同时又直接将拟合参数作为目标的分类特征。

First, a map between the cones and tangent surface on C-Bézier curve und two-dimensional plane is found respectively and then a ruled surface between two Bezier curves is constructed and a sufficient condition on its developablity is given.

zier曲线上锥面、切线曲面的展开方法。然后，构造两条空间B？zier曲线上的直纹面，给出了它成为可展曲面的一个充分条件，并通过保角保长原则，将其贴合到平面上。

The vaulter seemed to start to swing to inversion as he swung approaching a constant visual distance to one stationary point in the space.

由髋角相对於眼睛水平位置变化曲线，发现当眼睛到达某一固定位置时，同试跳高呈现曲线重叠现象，与前摆脚往上开始动作时间相同。

First, the cross section of a boxlike girder is discretized into stiffened elements and corner elements, then the FEM program is compiled to calculate the curve between stress and strain of every stiffened element.

加筋板单元是船舶与海洋工程等箱型梁结构的主要组成构件，首先将箱型梁剖面离散成若干加筋板单元和角单元，利用非线性有限元方法逐一计算加筋板单元的应力—应变关系曲线，然后再用逐步破坏分析法得到整个结构的弯矩—曲率曲线，从而求得其极限弯矩。

The basic concept of FOP can be summarized as to further optimize effective prescription according to the standard of curative effects and with the aid of modern science and technology and theories of traditional Chinese medicine.

其基本内涵可概括为：以确有疗效的中药复方为研究对象，以现代科学技术和传统中医药理论为技术支持，以该复方所治病证的药效响应为评价标准，以优化重组疗效更优的新复方为研究目的。

Ever since our world has been a world, native forests have been indiscriminately exploited by man.

自从我们的世界一直是世界原生森林被任意剥削人。