透镜

. It is necessary to cut the sheet 5 of Fresnel lens as the semi-finished product along the four cutting lines to remove the unwanted portions from the sheet 5 as described above.

第8条第。既要削减表5菲涅耳透镜作为半成品，沿线四个切割线，以消除有害的部分，从表五如上文所述。

The focus of Fresnel zone lens is related to both the radius and the number of loops, however is independent to its phase grades.

在环带相位深度P为2p 时，菲涅耳波带透镜的焦距与其半径和环带数有关，而与相位阶数L无关。

In the second chapter,I calculate the diffractive efficiency when there arealignment error,depth error of the step and the work was elength error,based on the theory ofthe fresnel lens.

第二部分文章在介绍菲涅耳透镜设计原理和衍射效率计算的基础上，重点分析了存在各种加工误差时候的衍射效率的计算情况。

"Refinements in lenses (e.g., the Fresnel lens) and reflectors made it possible to substantially increase the light's intensity ."

而利用透镜和反光镜的辅助设备可使灯光强度倍增。

Based on these and followed by proper reservoir classification and characteristics analysis,this paper established the methods for reservoir description of subtle pool with complex fault blocks,by which the main trap within the belt could be divided into fault block trap,structural trap and subtle trap which includes sand lens trap,lithologic updip thinning out trap,structural-lithologic trap and fault lithologic trap. For self-confined fault controlling oil flow,its height of oil column can be estimated by utilizing R.R.

在此基础上，通过油藏的具体分类和特征分析，建立了复杂断块隐蔽油藏的储集层和油藏描述方法；将东营凹陷中央隆起带中的主要油气藏划分为断块圈闭、构造圈闭和隐蔽圈闭，其中隐蔽圈闭包括砂岩透镜体圈闭、岩性上倾尖灭圈闭、构造-岩性圈闭、断层-岩性圈闭四类；提出在控油断层自密封的情况下，油藏高度可采用R.R。

The original technology is based on the far-field optical but all of them are restricted by Rayleigh diffraction limit.In order to break optical diffraction limit restrictions, people improve recording density in three ways:(1) shorten wavelength of light,(2)increase numerical aperture of the lens N.A.

不过上述储存方式所采用的记录技术皆是在远场光学的领域内，在远场光学的绕射极限下，要持续提升记录密度的方法有三种；(1)缩小光源波长(2)提高透镜的数值孔径

A multilayer Laue lens with a 15-nm outermost zone width is designed for an incident X-ray beam with an energy of 8 keV.

针对入射光为8keV的X射线，设计了最外层宽度为15nm的多层膜Laue透镜。

There is ongoing discussion among academics over the nature of the Nimrudlens, a piece of rock crystal unearthed by John Layard in 1850, in the Nimrud palace complex in northern Iraq.

有关尼姆德透镜的问题上，有一场学术性的争论。那是1850年间，约翰莱亚德在伊拉克北部的尼姆德宫殿遗址发掘的一块水晶头的石头。

Van Leeuwenhoek was interested in improving the lenses that were used in making microscope s.

范。拉乌文胡克对于改进用来制作显微镜的透镜感兴趣。

Van Leeuwenhoek was interested in improving the lenses that were used in making microscopes .

范。拉乌文胡克对于改进用来制作显微镜的透镜感兴趣。

I am sure after a few weeks of adaptation and familiarization I will have no difficulty in functioning on a daily basis in an English speaking society or in participating fully in graduate studies.

在大学的三年的学习生活不仅给予我自身的充实，更重要的是磨练和培养了我较强的自觉能力和严谨，踏实的作风以及不怕困难的精神，对未来充满了信心！

As the first volcanoes erupted, one of the gases that bellowed out was steam.

在第一批火山喷发时，喷出的气体之一就是水蒸汽。