曲面

This paper presents an efficient approach of designing a special dome and its aberration corrector, using the method of Wassermann-Wolf differential equations to generate the optimum contour of the corrector through a macro in CODE V. This corrector reduces spherical aberration and coma which are introduced by the dome and improves the imaging quality of the system.

本文提出了一种有效的特殊整流罩及其像差校正器的设计方法，运用Wassermann-Wolf微分方程组的原理，通过在CODE V中编译宏程序曲面拟合的方法得到校正器最佳面形，从而可以校正整流罩引入的球差、彗差，使系统成像质量得到较大的改善。

This paper introduces a method of improving the surface finish quality by adopting macro command in processing periodical cycle curve and camber on the NC lathe.

针对数控机床加工周期性循环的曲面或曲线时出现的进给速度突变，提出了一种利用宏指令编程来控制循环的解决方案。

However, both of them are directly affected by choosing different types of mandrel s.

利用仿真技术对薄壁铜管绕弯成形中圆头、关节、曲面3种形式的芯棒对弯管质量的影响进行了研究。

A map projection is any method used in cartography to represent the two-dimensional curved surface of the earth or other body on a plane .

在制图学中，任何将地球的二维曲面表达为平面的方法都可以被称为地图投影。

It's obviously that it's not practical if you use such broken and wrinkled plane mapping. So we must adopt special methods to spread the curved surface, which is called map projection theory.

若用这种具有破裂或褶皱的平面绘制地图，显然是不实用的，所以必须采用特殊的方法将曲面展开，使其成为没有破裂或褶皱的平面，于是就出现了地图投影理论。

By giving the definition of mapping space, some abstract and basic conjugation elements can be impressed by direct geometric graphics. Also, resort to the mapping space, the fundamental theorem of singular conjugation is proved.

本文研究了共轭曲面原理的奇点共轭理论，并在此理论指导下对新型奇点共轭传动——0°渐开线包络蜗杆传动进行了系统的理论分析与实验研究。

Functional requirements of habitat for these two species, expressed as habitat suitability and marginal density efficiency, and factors reflecting human disturbances such as the weighted road density and buildup density, were used in the calculation of a cost surface for Least Cost Analysis.

因此挑选杂食性的台湾黑熊及草食性的台湾长鬃山羊为目标物种，利用物种对於两个栖地因子（栖地适宜度、边际密度效应）及人为干扰因子（道路加权密度、建物密度）的反应强弱，制作成本曲面图。

Data analysis shows that relation between matric suction and density at different m...

数据分析表明：基质吸力与干密度的关系在不同的含水量段具有不同的特点；基质吸力与含水量呈强非线性关系；在土的水分状态和密度状态空间，基质吸力的分布为一变形的 W 型折曲面。

It is feasible to simplified curved surface of second degree and solved some polynomials factor decomposition by the theories of the matrix algebra.

用矩阵代数的理论简化二次曲面和解决某些多项式的因式分解的方法是可行的。

Some properties of the pseudo umbilical surface M in R 4 are discussed and thus the lower for the tolal mean curvature of M is estimated.

本文研究了伪脐曲面M的一些性质，基于它并利用M的Gauss映射，给出了M作为R4中平坦环面的一个充分条件。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。