双透镜的

In such a medium, the direction of the Poynting vector monochromatic plane wave is antiparallel to that of its phase velocity. Because of that, DNG displays some unusual electromagnetic properties such as backward-wave effect, negative refractive effect, perfect lens and a limit situation, zero index of refraction materials.

在这种材料中，单色均匀平面波的相速方向和坡印亭矢量方向是相反的，因此使双负材料表现出一系列反常的电磁特性如：回波效应、负折射效应、完美透镜效应和一种极限情况即零折射率材料等。

Starting from Collins integral,the focusing characteristics of Gaussian beams passing through a bifocal lens are studied.

从Collins公式出发，研究了高斯光束通过双焦透镜后的聚焦特性。

The approach is based on the principle that the a pa rticle will form double points on the image plane when the particle is out of fo cus in an optical system with a two pinhole lens.

该方法是当利用双孔透镜成像时，单点粒子在离焦光学成像系统中会形成包含粒子空间信息的两点像，根据粒子像在像平面上的位置和间距可以获取空间粒子的三维空间位置。

These results indicate that the supper resolution in both transeverse and axial directions can be obtained meanwhile by the use of doublet.

说明双胶合透镜在横向和轴向同时具有较强的超分辨能力。

Methods On the symmetrical plane of the double-Gauss lens with 1:1 magnification,the Fraunhofer diffraction of the object surface could be formed.

方法在双高斯1：1制版镜头的对称面上形成物面的夫朗和费衍射，并使物面与茶形散斑屏重合，使得各物点均以狭缝状的光束通过透镜组在记录介质面成像。

The MTF of the same lens in the different space frequency is measured, the results agree well with the practical results.

对同一双胶合透镜在不同空间频率下的MTF值进行了测量，所得结果与实际值基本吻合。

An optical element such as a rear projection screen for an image display device comprises at least two substantially rigid sheet members each having a first major surface and a second major surface providing a plane of incidence and a plane of emergence, respectively, through which light is transmitted sequentially. A first sheet member comprises a Fresnel lens, and a second sheet member comprises a lenticular lens array on each of the major surfaces thereof.

一种光学元件，例如用于图象显示装置的背投式屏幕（1），包括至少两个基本为刚性各具第一主表面（21；31）和第二主表面（22，32）的板部件（2；3），分别提供顺序穿过光线（10）的入射面和出射面，第一板部件（2）和第二板部件（3）在其各个主表面（31，32）上分别包含一个菲涅耳透镜（24）和一个双凸透镜阵列33，35。

The influence of KTP's thermal effect was controlled and the efficiency of the frequency doubling increased. The steady working of KTP crystal in high power level was realized. 3. A traditional plano-concave cavity was used.

采用传统平凹腔，分析了高泵浦功率下Nd：YAG棒热透镜效应和热致双折射效应的影响，得到了高功率激光器运行在第Ⅱ稳区并且基模体积受到限制的结论。

The result indicates that the spherical aberration of positive lens reduce the coupling efficiency.

最后采用双胶合透镜对球差适当的消除，耦合效率得到提高。

On 24 June 1904 the issuing certificate for a new Zeiss trademark was issued; this logo was fashioned with "Carl Zeiss" within in the border of an achromatic doublet lens outline designed by a consultant Erich Kuithan b.

1904年6月24日，蔡司公司的新商标得到了确认。商标图案是一片消色差双合透镜外轮廓线，里面套着&Carl Zeiss&字母，由公司顾问埃瑞克库森（Erich Kuithan，1875年生，卒于1917年）设计。

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％。