双透镜的

In view of globe lens grinding, multi-component glass substrate ion exchange and crystallization of the glass substrate of light and heat, a method is proposed for designing, manufacturing aplanatic double-convex aspherical waveguide lens and testing its parameter.

针对微透镜制作采用的球透镜研磨，多组分玻璃基板离子交换，结晶化玻璃基板光热法，本文提出非球面消球差双凸波导透镜设计、制备及参数测试方法。

This article outlines the progress of ancient Chinese lenses from the Pre-Qin Period to the Five Dynasties, and discusses mainly two arguments: First, the"yangsui" recorded and narrated in Lun Heng by Wang Chong of Eastern Han Dynasty may be a plano-convex glass lens; secondly, the"four mirrors" recorded and narrated in Tanzi Hua Shu by Tan Qiao of Southern Tang Dynasty may be a plano-convex lens, a biconvex lens, a transparent planeparallel plate and a concave-convex lens respectively, but what kind of tra...

本文概述了中国古代透镜从先秦到五代的发展进程，着重从古代文献和出土文物的研究出发，结合中国古代社会经济发展水平，论证了东汉王充《论衡》中记述的阳燧可能是玻璃平凸透镜；论证了南唐谭峭的《谭子化书》中记述的"四镜"可能是平凸透镜、双凸透镜、平光镜和凹凸透镜。作者认为《谭子化书》"四镜"段可能实际上是对中国古代透镜发展的阶段性总结。

The way to find a flat slab lens system free from all five Seidel aberrations was described accordingly.

作为两个特例，分别讨论了消赛德尔像差的左手性介质单透镜和双胶合透镜系统。

Because of the use of novel technique of mode choosing and shape modifying to the high power infrared diode laser,and of manipulating the trap with dual-lens scanning, the tweezer is easy to be constructed and operated.

由于采用了独特的对大功率多模红外激光选模整形和双透镜陷阱操纵技术等性能价格最优化选择，该系统易于构建，陷阱操作方便，其构建价格仅一般光镊的几十分之一，非常适合光镊技术的推广和一般实验室构建。

Seeds uniseriate or biseriate, wingless, oblong, ovate, reniform, orbicular, ovoid, lenticular, elliptic, ellipsoid, or globose, slightly flattened; seed coat minutely reticulate or papillate, not mucilaginous when wetted; cotyledons incumbent or rarely accumbent.

双列的种子单列或，无翅，长圆形，卵形，，圆形，卵球形，透镜状，椭圆形，椭圆形，或球状，稍扁平；种皮微小的网状或具乳突，不黏什么时候弄湿；子叶现任的或很少依着。

Considering the thermal-induced birefringence, the g parameter coordinate system is analyzed, the formulas of radially polarized and azimuthally polarized focal lengths in three different cavity structures are deduced and the proper cavity structure to get the thermal focal length coefficients is presented.

考虑热致双折射效应，利用等效谐振腔的g参数坐标图进行分析，推导了三种不同腔型结构下径向热透镜焦距和切向热透镜焦距系数的计算方法，分析并得出了测量热透镜焦距系数所需的腔型结构。

The apparatus includes an optical fiber biconic lens disposed on an end of the optical fiber such that the optical fiber and the biconic lens define an optical axis.

该装置包括一个定位在光纤(44)一端上的光纤双锥形透镜(46)，使得光纤和双锥形透镜限定光轴。

This article outlines the progress of ancient Chinese lenses from the Pre-Qin Period to the Five Dynasties, and discusses mainly two arguments: First, the"yangsui" recorded and narrated in Lun Heng by Wang Chong of Eastern Han Dynasty may be a plano-convex glass lens; secondly, the"four mirrors" recorded and narrated in Tanzi Hua Shu by Tan Qiao of Southern Tang Dynasty may be a plano-convex lens, a biconvex lens, a transparent planeparallel plate and a concave-convex lens respectively, but what kind of tra...

本文概述了中国古代透镜从先秦到五代的发展进程，着重从古代文献和出土文物的研究出发，结合中国古代社会经济发展水平，论证了东汉王充《论衡》中记述的阳燧可能是玻璃平凸透镜；论证了南唐谭峭的《谭子化书》中记述的&四镜&可能是平凸透镜、双凸透镜、平光镜和凹凸透镜。作者认为《谭子化书》&四镜&段可能实际上是对中国古代透镜发展的阶段性总结。

As a singlet curved lens is impossible to correct all the five primary aberrations regardless it is made of PIMs or NIMs, the primaxy-aberration-free lens systems composed of two thin lenses or two thick lenses based on the use of NIMs are intentionally presented.

由于只靠单块曲面透镜是无法同时消除全部五种初级像差的，因而我们接着研究了由负折射率介质构造的能同时消除全部五种初级单色像差的双薄透镜组合系统和双厚透镜组合系统。

A compound structure—Double Half-cylindrical Lens is proposed firstly by the author.

双半圆柱透镜是作者首次提出的一种复合结构柱透镜，它突破了普通圆柱透镜在最佳准直时对透镜材料折射率必须小于2的限制，在透镜材料大于2甚至更高的条件下，其准直能力大大提高，准直效果在理论上可达0.1mrad。

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％。