主平面

在可见光波段上，采取三种角度采样间隔，对草地及类草地的人工目标主平面的BRDF特性进行了野外测量实验。

In visible spectral band , we measured the BRDF of grass and man-made object similar to grass with three angular sampling intervals in principal plane .

光线的主平面和晶体的主截面

Principal Plane of Ray and principal Section of Crystal

给出其在两个主平面&E平面与H平面上的辐射方向图和波束场分布特性的测试结果以及电压驻波比VSWR的测量结果；同时给出频带和旁瓣特性。

The measurement results of patterns , field distribution characteristics of wave beam in two principal planes-H plane and E plane and the voltage standing wave ratio VSWR , and the properties of bandwidth and sidelobe are given .

从KTP色散方程及其参数数据得到折射率、色散曲线、主轴坐标平面上倍频相位匹配（PM）角，并分析各组数据的可靠性及KTP色散特性。分析双轴晶体主平面上倍频PM的表征。

The reliability of dispersive data and the dispersive properties are analyzed characterization for phase matching ( PM ) of frequency doubling in the principal planes of biaxial crystals are depicted , in terms of polarization directions of 3 wave involved .

空间场的仿射变换中主平面的确定

Determination of main plane in the affine transformation of space field

关于主平面方位角的一个更有效的公式

An More Effective Formula about Direction Angle of the Main Plane

二向应力状态下主平面的简捷评定

Forthright Judge of Main Plane in Two Dimensional Stress state

确定透镜主平面位置的作图方法

The Construction Method of Determining the Positions of the Principal Planes of Lens

主平面与主应力对应关系的直观判断方法

A direct observational method to determine two principal planes corresponding with two principal stresses

确定平面应力状态主平面位置的一个补充规定

Supplementary Regulations on Deciding the Place of Main Plain in the State of Plain Stree

旋转主平面法实现钛宝石激光三倍频

Third harmonic generation of ti : sapphire laser by rotating the cardinal plane of BBO crystal

并且2个极化端口在其对应主平面方向的交叉极化电平均低于-38dB。

The cross-polarization suppression is lower than - 38 dB in both horizontal and vertical ports .

结果表明：冬小麦在太阳主平面呈现出强烈的各向异性反射特性。

The results show that winter wheat exhibits strong anisotropic characteristics in the solar principal plane .

空间缩放机构由于在其运动主平面内的运动解耦性，被用作步行机构。

Three-dimensional pantograph mechanism was used as walking mechanisms because of the motionaldecoupling at its principal planes .

这时，o光和e光的主平面重合且都入射面内。

Now the principal planes of o and e rays coincide and lies in the incident plane .

对每一种应力状态，至少存在三个主平面，它们互相垂直。

In every state of stress there exist at least three principal planes , which are mutually perpendicular .

因此，可以根据主平面内各飞行任务剖面的第一、二主成分的分布情况直观地进行定性地分类。

The qualitative categorization can be done from the first and the second principal components distribution range in the principal plain .

矢量与两个主平面夹角的平分面的夹角。

Furthermore the angle between each E-vector and the plane dividing equally the angle between two main planes of the biaxial crystal is also given .

文中给出了该透镜的主平面、焦平面和焦距计算公式，以及近轴成像高斯公式。

The formulas for determing the principal planes , focal planes and the focal lengths are derived and the paraxial imaging Gaussian formula is also given .

本文从光线轨迹方程出发，推导了锥形梯度折射率纤维的物像关系式，并得出了它的等效焦距和主平面位置。

Starting from the ray path equation , object-image relationships are found and used to determine the equivalent focal length and the principal planes of tapered GRIN fiber .

通过在第一全局主平面图绘出的城市综合经济实力的时序历程，可以直观看出近几年所发生的变化：城市经济正在快速发展，但发展速度逐年减慢。

From the first overall plan of the city comprehensive economic strength , we can see the recent changes and the rapid city eco-nomic development but the development speed lowers year by year .

探讨了空间场的仿射变换中主平面的问题，得到一种确定主平面位置的方法。

In this paper , the question of main plane in the affine transformation of space field is investigated . A kind of method is got by which position of main plane is determined .

在对已有三维模型检索技术研究的基础上，本文针对主平面分析的方法进行了研究和改进。

After studying prevenient 3D model retrieval methods , the method of Principal Plane Analysis is studied and improved in this paper . Firstly , the method of Principal Plane Analysis was analyzed and studied deeply .

此款前翼有着几乎完全平直的主平面（2），主翼片（1）和上层翼片（3）。后两者都是在大多数赛道上不常见的小角度（极低下压力）翼片。

It features an almost straight main plane ( 2 ), and the main flap ( 1 ) and upper flap ( 3 ) both have a far lower angle of incidence than seen at most tracks .

本文提出了晶体光学教学由一个值得注意的问题：主平面与主截面是两个不同的物理概念，两者不能混为一谈，在教学中也不能有所偏重。

This paper puts forward a problem in crystal optics teaching which merits our attention : principal plane and principal section are two different physics concepts . The two concepts cannot be confused , nor be neglected in teaching .

根据折射率椭球方程及双光轴晶体中光波的传播与偏振特性，分析双轴晶体在主平面内激光倍频相位匹配的特性与方法，导出光波在主平面内传播时倍频的相位失配关系；

Based on index ellipsoid equation and characteristics of optical wave propagation and polarization in a biaxial crystal , methods of the collinear phase matching ( PM ) permitted for frequency doubling in principal planes of biaxial crystals are discussed and analysed .

C方式：在相邻挤压道次之间，试样沿挤压轴线相同方向旋转180°，使偶次挤压后，主剪切平面的累积剪切应力趋于零。

As the route C , the sample is rotated along the same direction about the extrusion axis by 180 ° so that the accumulative shear strain on the main shear plane is about zero while in even numbered passage .

在抽油机支架强度分析中，在全局坐标系下确定主惯性平面方位的参考节点的位置非常困难。

In the strength analysis of the pumping jack of a pumping unit , it is very difficult to determine the reference node position under global coordinate system .

和未加阻尼支撑的地震响应的比较结果表明，尼木大桥主拱平面内的位移得到了良好的控制，阻尼支撑的作用相当明显。

The comparison between Nimu Bridge with and without damping braces shows , the displacement within the arch plane have been controlled , and the effect of damping braces is obvious .

在此，基于左右两把剪刀的剪切平面相对于主传动平面成±45°，以及与变结构相结合的设计理念，设计出了两根互绕扁螺旋钢丝的剪切机构。

At here , based upon designing idea of the shearing planes of left and right two shears are at ± 45 ° with respect to main transmission plane and the combination with changeable structure , the shearing mechanism of two mutually twisted flat screw wires was designed .