双曲面

Among the three concave reflecting surfaces, namely, a spherical cap, a paraboloid and a hyperboloid of revolution, the enhancement degree of FM for a spherical reflector is the largest.

在球面、旋转抛物面和旋转双曲面三种类型的凹面反射端中，采用球面反射端通过上述方式提高悬浮力，可以获得最佳效果。

Thereby, it generalizes portfolio frontier curve from hyperbola to hyperboloid of two sheets. When there exists risk securities, it generalizes frontier from straight line to cone. Meanwhile it gives some corresponding conclusions.

从而把原模型中没有无风险证券时的前沿证券曲线从双曲线推广到双叶双曲面，把有无风险证券时的前沿证券曲线从直线推广到圆锥面，同时还得到了一系列相应结论。

This is the design of a discharge of the mechanical erect kiln device, which is hyperboloid may change tooth.

本课题是设计机械立窑上的一种双曲面可换齿卸料装置。

Mathematical model for hyperboloid grinding of twist drill and relationships between drill design and grinding parameters are introduced.

介绍了以回转双曲面作为麻花钻后刀面的数学模型，设计参数与刃磨参数的关系。

Many other discussions on the sections of η-ξ spacetime can be similarlycarried out on the cross sections of this hyperboloid.

在η-ξ时空的截面上的许多讨论可以类似地在这个超旋转双曲面的截面上进行。

When shape analysis is finished, the mechanical characteristics of hyperboloid shape membrane structure are studied and the influence of different parameter to the character of the structure discussed.

在形态分析的基础上，对双曲面索膜结构进行静力性能分析，计算该结构在不同参数下的结构响应，并研究各种基本参数变化对索膜结构受力性能产生的影响。

A hyperboloid with an aperture of 350 mm is tested by this method.

利用该方法对一口径为350mm的双曲面进行了拼接检测，拼接后得到的全口径面形误差的PV值为0.433lambda，RMS值为0.052lambda(lambda=632.8nm)。

Hence a theoretical basis is establised for design and grinding of the hyperboloid twist drill.

给出了该钻型设计参数与刃磨参数之间的函数关系式，为双曲面麻花钻型的设计和刃磨提供了一定的理论基础。

Because hyperboloid gear wheel have a series of advantage, therefore it use than spiral awl gear wheel extensive.

3双曲面主动齿轮具有较大的轴向力，使其轴承负荷增大。

Key words: steel structure; roof; hyperboloid; installation; unloading; dismantle

关键词］钢结构；屋面；双曲面；安装；卸载；拆除

I'm strongly against the death penalty — it's an eye for an eye.

我不赞成死刑——这是以牙还牙的报复行为。

And to get you the support you need, we're enlisting all elements of our national power: our diplomacy and development, our economic might and our moral suasion, so that you and the rest of our military do not bear the burden of our security alone.

并给你们所须的支援，我们正徵召国家所有各种的力量：我们的外交及发展，我们的经济力量与道德劝说，所以你们与其他军人不须要孤独地负起国家安全的责任。