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The compensability between the longi1

The compensability between the longitudinal and transverse mismachining tolerance of grating in the optical pick-up head

In this paper numeric analysis is made to the influence of the longitudinal mismachining tolerance (LMT)and the transverse mismachining tolerance (TMT) of the grating in the optical pick-up head (GOPH) of VCD, DVD, and CD-ROM on the transmissivity and the intensity ratio of the auxiliary light beam to the main read-write light beam (IRAM) by using the general expression of diffraction efficiency obtained from the scalar diffraction theory. On solving GOPH problem, the scalar diffraction theory and the vector diffraction theory are coincident, and the scalar diffraction theory is reliable. The result shows that LMT and TMT can compensate for the inverse effect of IRAM, however, at the expense of reducing transmissivity. As far as GOPH is concerned, the goodness that LMT and TMT can be effectively compensated for is very advantageous in manufacturing of the grating.

作 者：巴音贺希格 齐向东 李文昊 唐玉国  作者单位：Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033 刊 名：激光与光电子学进展  ISTIC PKU英文刊名：CHINESE OPTICS LETTERS 年，卷(期)： 2(5) 分类号： 关键词：

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Non-classical correlation between a2

Non-classical correlation between a single photon and the collective spin excited state of a cold atomic ensemble

We experimentally establish a non-classical correlation between a single Stokes photon and the collective spin excited state of a cold atomic ensemble by using a spontaneous Raman scattering correlation between them can be proved by transferring the spin excited state of the atomic ensemble into an anti-Stokes photon and checking the Cauchy-Schwarz inequality between the Stokes and the anti-Stokes non-classical correlation can be kept for at least 300 ns.

作 者：Xiaosong Lu Qunfeng Chen BaosenShi Guangcan Guo  作者单位：Key Laboratory of Quantum Information,University of Science and Technology of China,Hefei 230026,China 刊 名：中国光学快报(英文版)  ISTIC EI英文刊名：CHINESE OPTICS OF LETTERS 年，卷(期)： 7(11) 分类号： 关键词：

between是什么意思3

例句：

1、I think the relationship between patients and doctors has got a lot less personal.

我认为医患之间的关系变得越来越缺乏人情味。

2、Students will be able to choose between English, French and Russian as their first foreign language.

学生可以在英语、法语和俄语中间选择一门作为第一外语。

3、There are no significant differences between the two groups of students.

这两组学生没有明显差别。

4、There is no difference between the two in quantitative terms.

两者在数量上毫无差别。

5、There is a fundamental difference between the two poin ts of view.

这两个观点有根本区别。

Association between the4

Association between the -1562 C/T polymorphism in the MMP-9 promoter and phenotype of esophageal squamous cell carcinoma

Objective To conduct a case-control study on the association of the nucleotide polymorphisms in the promoter region of the matrix metalloproteinase-9 (MMP-9) gene with phenotype of esophageal cancer. Methods All subjects were unrelated residents in northern regions of China. Polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) analysis was used to determine the MMP-9 genotypes. Results The overall distribution of genotypes in the patients was not different from that in the controls (OR=, 95% CI=; P=). There were no significant differences between the patients and the control subjects in terms of the distributions of sex and age, smoking status, alcohol dependence, pickled diet status, or history of environmental exposure. The patients were further examined with stratifications by age, sex, grade, depth of tumor invasion, lymphatic invasion, venous invasion and TNM staging. The results showed no pronounced association among the stratifications. Conclusion There is no significant association between the MMP-9 single nucleotide polymorphism genotypes and phenotype of esophageal cancer.

作 者：Peng Xia Dong-Min Chang Cheng-Xue Dang Lei Meng Hua Xue Yang Liu  作者单位：Peng Xia,Dong-Min Chang,Cheng-Xue Dang,Lei Meng,Hua Xue(Department of Surgical Oncology, the First Affiliated Hospital, Medical School of Xi'an Jiaotong University, Xi'an 710061)

Yang Liu(Institute of Proteomics and Systems Biology, Zhongshan Hospital of Fudan University, Shanghai 32, China)

刊 名：西安交通大学学报（英文版） 英文刊名：ACADEMIC JOURNAL OF XI'AN JIAOTONG UNIVERSITY(ENGLISH EDITION) 年，卷(期)： 22(1) 分类号：U4 关键词：matrix metalloproteinase-9 (MMP-9)   single nucleotide polymorphism   phenotype   esophageal cancer   polymorphism

The Difference between a Brain and a5

The Difference between a Brain and a Computer(人脑与电脑的区别)

The Difference between a Brain and a Computer

~he difference between a brain and a computer can be expressed in a single word: complexity.

Even the most complicated computer man has yet built can't compare in intricacy with the brain. Computer switches and comportents number in the thousands rather than in the 's more, the computer switch is just an on-off device,whereas the brain cell is itself possessed of a tremendously complex inner structure.

Can a computer think? That depends on what you mean by“think”。 If solving a mathematical problem is“thinking',then a computer can”think'and do so much faster than a man. Of course, most mathematical problems can be solved quite mechanically by repeating certain straightforward processes over and over again. Even the simple computers of today can be geared for that.

Surely, though, if a computer can be made complex enough, it can be as creative as we are. If it could be made as complex as a human brain, it could be the equivalent of a human brain and do whatever a human brain can do.

But how long will it take to build a computer complex enough to duplicate the human brain? Perhaps not as long as some think. Long before we approach a computer as complex as our brain, we will perhaps build a computer that is at least complex enough to design another computer more complex than itself. This more complex computer could design one still more complex and so on and so on and so on.

In other words, once we pass a certain critical point, the computers take over and there is a“complexity explosion”。 In a very short time thereafter, computers may exist that not only duplicate the human brain--but far surpass it.

人脑与电脑的区别

要形容人脑与电脑的'区别只需一个词，即：复杂。

即使是迄今为止人类制造出的最复杂的电脑如果与人脑的复杂相比也望