直纹

In this paper, the design and study of the polar coordinates processing system for straight generatrix surface with WEDM are presented.

本文介绍了电火花线切割加工空间复杂直纹曲面的极坐标加工系统的设计与应用研究。

At the end of this paper, the later studies on the WEDM technology and the WEDM for straight generatrix surface technologies are suggested.

论文最后对空间复杂直纹曲面的电火花线切割加工技术的后续研究提出了设想和展望。

The processing system could solve the problem, which in the processing of WEDM for straight generatrix surface, and this method gets a wild application in the mould manufacture.

此系统可以解决某些复杂空间直纹曲面的加工问题，在模具及异形零件制造中可望得到良好应用。

Before October Revolution, the greatest change in Russian attires occurred in the upper class. In the early 18th century, aristocracies began to wear western-style clothes. Women were habited in blouses that were chest exposing and crinolined skirts provided with steel frames to support the drapery.

十月革命前，俄国变化最大的是贵族的服装。18世纪初，贵族们开始穿西服，妇女穿软直纹长裙。19世纪中，贵族男子流行燕尾服，妇女为袒胸衫和用细骨架支撑起来的钟式长裙。

Being formed by linear grain curved surface, helicoid can be expressed by a group of simple lines. Writing two equations of inside and outside of the helicoid, getting any one of simple line′s equation and from which getting the coordinations of two end points by projection transformation, the CAD system of helicoid is achieved. It...

由于螺旋面为直纹曲面，因此可用它的一组素线表示，用极坐标的形式写出内外两条螺旋线的方程，求出任一素线的方程，并通过投影变换求得素线上两端点的坐标矩阵，进而设计出螺旋面的CAD系统，并将其应用于实践，为设计优化决策提供有力的证据。

The both sides of the aisle is vertical grain glass, as the separation of half-transparence, balancing the emptiness and the fullness with the solid metope, maintaining the privacy of the conference room and the reception room and avoiding blankness and tedium at the same time.

狭长的过道两边，以直纹玻璃作为半通透隔断和实墙面作虚实的对比，同时保持会议空间和接待空间的私密性，也破除了过道的单调和沉闷。

At last, the author presents the multi-coordinate NC machining methods of turbine wheel with non-developable ruled paraboloid.

从理论上深入分析了叶型为非可展直纹抛物面的叶轮的五坐标侧铣、四坐标侧铣和三坐标端铣数控加工计算方法。

In order to implement NC ultrasonic grinding of parallel ruled surface ,calculation of cutter location and post processing method were introduced.

介绍了新研制的数控超声磨削成形加工机床的各运动轴，以及实现平行直纹面数控超声磨削加工的刀位计算和后置处理方法。

Rational planar curve; rational space curve; rational ruled surface; moving curve/surface;μ-bases; singularity; self-intersection curve; moving curve/moving surface ideal; ideal-theoretic/set-theoretic generators

基础科学，数学，几何、拓扑平面有理曲线；空间有理曲线；有理直纹面；动曲线/曲面；μ基；奇点；自交线；动曲线/动曲面理想；集论/理想论生成元

Therefore, we can predict the variation of the cutting forces during the end mill moving along the ruled surface.

因此，刀侧贴著直纹曲面移动的切削力变化，可以模拟预测。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。