抛物面

To give you an idea - the maximum deviation of the required parabola for a 30 inch f/3 from the sphere is about 50 wave.

给你一些慨念，壹只 30 英吋口径焦比 f/3 其所需抛物面与球面的最大偏差数是大约 50 波。

A sphere mirror was used to replace an off-axial parabolic mirror, and a meniscus lens was introduced to compensate aberrations.

二级折反射系统实现激光束的高倍率扩束，由球面反射镜取代离轴抛物面镜，用一片弯月透镜补偿像差。

In the present paper, two new hypotheses are proposed that the outward normal of the dendrite surface is parallel to the gradient of the actual supercooling, and that the dendrite growth is capable to minimize the solute transfer .

但是，以往的研究中，枝晶组织和枝晶生长这两个密切相关的问题一直被分隔开来进行研究；在稳态枝晶生长理论研究中，由于枝晶界面真实形状问题没能解决，迄今为止，比较有希望的理论模型都是建立在"枝晶界面的旋转抛物面假设"这样一个早已被认定不是枝晶界面真实形状的"基础"上。

Another confirmation that this is a very good feed is the purity of achieved radiation diagram of parabola.

另一点被证实的是，这是一个方向图纯净完美的，非常好的抛物面天线的馈源。

That is exactly how much it would be gained with twice as small, efficiently illuminated offset parabola!

严格的说，这是二分之一照射强度的偏馈抛物面天线的照射强度。

On the ship body, the parabolic curve panels are adopted to discretize the surface in order to improve the continuity and the linearly variable sources are distributed on panels. The solid boundary condition is satisfied rigidly on the curve panel.

在船体上，本文采用了二阶抛物面单元离散船休表面，以改善用平面单元离散时出现的不连续，并在单元上布置强度呈线性分布的源汇，固面条件在曲面单元上严格满足。

Based on the structure of a non-tracking internal-concentrator solar PV-thermal tube collector and the absorber design requirements, the optical design for the compound parabolic concentrator with half cylinder absorber is proposed to improve the solar energy efficiency. Matlab software was used for the optimization and simulation of the concentrator curve and shape. The curve equation of concentrator for maximum incidence of light of the collector was obtained; and the installation locations for CPC/half cylinder absorber and the necessary CNC processing parameters were optimized.

针对非跟踪内聚光光电－光热复合管的结构及接收器的设计需求，对管内具有特殊形状的半圆柱接收器的复合抛物面聚光器进行了光学设计，并利用Matlab软件对聚光器曲线和形状进行了优化与数据仿真，得到了光热复合管能够得到最大入射光的聚光器的曲线方程、安装位置以及供数控机床加工所需的参数，给出了不同入射角的光线和光强分布图，提高了太阳能的利用率。

Archimedes obtained the parabolic arch, spiral, circular area and volume as well as the ellipsoid, parabolic complex geometry and physical size.

阿基米德求得了抛物线弓形、螺线、圆形的面积和体积以及椭球体、抛物面体等复杂几何体的体积。

Finally on this basis, a new type virtual second parabolic Fresnel lens model is established by Pro/ENGINEER.

最后在此基础上，以Pro／ENGINEER为工具，建立了二次抛物面型菲涅尔透镜的模型。

The invention also provides a method for producing the laser beam focusing integer type parabolic mirror formed in one piece using a rotary type high accuracy machine tool, with features of simple technique, increased capacity of reflector for proofing the high power laser beam and heat-sinking capability, and improved focusing quality of laser beam.

本发明还提供制造所述激光光束聚焦整型抛物面镜的方法，该方法利用回转型高精车机床一次成型加工，制造工艺简单，可提高反射镜耐高功率激光束的能力以及散热能力，改善激光束的聚焦质量。

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。