查询词典 paraboloidal

It was found that for large aperture ratios (the ratio of focal length of the primary to its aperture, as the f-ratio in modern cameras for instance), f/10 or more, the difference between spherical and paraboloidal mirrors was negligible in the performance of the telescope.

结果发现，大口径的比例（比例焦距初级到其孔径，由于架F -比率在现代相机举例来说）， f/10或更长时间，之间的差别球面和抛物面反射镜是微不足道的，在表现望远镜。

Manufacture of big aperture lightweight paraboloidal mirror is one of the key techniques for the research of the Cassegrain optical system.

研制某卡塞格林光学系统的关键技术之一是通光口径超过1000mm的轻质抛物面主反射镜。该反射镜相对口径为1/2，减重率为65%，是目前国内最大口径的轻质非球面反射镜。

Schmidt realized that by employing a large spherically shaped mirror (instead of the normal paraboloidal mirror of a reflector telescope) and a smaller apertured diaphragm placed at the center of curvature of the mirror, he could at a stroke eliminate coma and astigmatism.

施密特认识到雇用一个大球型镜（而不是正常的抛物面反射镜的反射望远镜）和一个较小的光阑膜片放置在中心曲率的镜子，他可以在消除中风昏迷和散光。

Others began considering the virtues of a concave paraboloidal mirror as primary receptor: it had been known since Antiquity that such a mirror would bring parallel incident rays to a focus at one point.

其他人开始考虑的美德，凹抛物面反射镜作为主要受体：它已被称为自古以来这样的一面镜子，会带来平行事件射线的焦点在1点。

In the first part, first, the operational principle of Varivec Propeller is explained. Secondly, the mathematical model for predicting longitudinal and transverse movement hydrodynamic characteristics of Varivec Propeller under steady or unsteady condition are present, based on the general propeller lifting-surface theory, potential flow theory and Green theorem. Thirdly, theoretical calculation methods for predicting hydrodynamic characteristics when the influence of paraboloidal boss on the performance of Varivec Propeller is or isn't considered are present, based on The finite basic solution method, the unsteady vortex lattice method and Hess-Smith method Different rake angle is adopted according to different desire in practical application.

在理论计算部分，本文首先给出了全方向推进器的工作原理，然后基于常规螺旋桨升力面理论、势流理论和格林定理建立了定常和非定常状态下全方向推进器纵向、横向运动的水动力性能计算的数学模型，并利用有限基本解法、非定常涡格法和Hess-smith方法分别对考虑和不考虑桨毂影响时的全方向推进器纵向、横向运动水动力性能进行了数值预报。

The primary reflector and the secondary reflector of the double-reflecting optical converging primary system are paraboloidal and hyperbolical mirrors, respectively.

所述双反射光学会聚主系统的主反射镜为抛物面镜，次反射镜的反射面为双曲面。

This is the paraboloidal mirror at the bottom of the tube.

主镜。是位于镜筒底部的一块抛物面镜。

As to manufacturing a Φ1800mm, F/1.5 large paraboloidal mirror, three structure models with different thickness of base plate were calculated and analyzed respectively.

以加工Φ1.8m、F/1.5的大口径抛物面主镜为参照，分别对三种结构模型在不同基盘厚度时进行了变形仿真计算。

The distribution of concentrated solar radiation in paraboloidal collectors.

旋转抛物面聚光器焦面能流分布的有限元分析。

The third chapter of the thesis discusses a novel paraboloidal lensed multimode fiber used in the fiber coupling of the high power single emitter broad area diode laser, and the results of the computer aided simulation of the coupling have been described too, the results verified the theory of paraboloidal lensed multimode fiber.

第三章详细讨论了利用抛物面型微透镜多模光纤与大功率宽发射域半导体激光器的耦合效率；利用计算机辅助模拟了耦合过程，并通过实验验证了耦合系统的可行性。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。