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Optical pickup is one of the kernels of optical storage industry. It is used for all kinds of optical storage systems widely. It consists of optical collimator system, optical focusing system, servo error signal generating system and the enforce element of servo system .

中文题名DVD光学读取头关键技术研究副题名外文题名 On key technology of DVD pickup 论文作者王继平导师阮玉学科专业物理电子学研究领域\研究方向学位级别博士学位授予单位华中科技大学学位授予日期2003 论文页码总数173页关键词DVD 光学读取头光盘光存储馆藏号BSLW /2003 /TQ597 /2 光学读取头是光存储产业的核心器件，它广泛应用于各类光存储设备中。

Because the carbonyl in its structure is with strongly absorb-electron effect, so it is a kind of non-proton polarity solvent with high boiling point, high flash point and low melting point, use conveniently for many processing operation such as filtration, distillation, solvent extraction, and so on; it is with very low toxicity, so the harm to human body is inappreciable, and reduce the environment pollution; due to its very strong dissolvability, it can dissolve organic matter, inorganic matter, resin, polymer, etc., and activate all kinds of reagent, mix to dissolve the other high boiling point solvents; it is with very good stability, it is stable under the hot strong alkali and acidity condition, it is with water-resistance and light, oxygen stability.

246℃ m.p：—20℃闪点121℃ flash point： 121℃分子式：C6H12N2O molecular formula： C6H12N2O 分子量128.18 molecular weight： 128.18 二、DMPU的化学性质 Chemical character of DMPU 其结构中由于羰基具有强烈的吸电子效应，因而它是一种非质子的极性溶剂，具有高沸点、高闪点、低熔点，在过滤、蒸馏、溶剂萃取等工艺操作中使用方便；毒性极低，对人体危害微不足道，也减少了对环境的污染；由于它具有极强的溶解性，能溶解有机物、无机物、树脂、聚合物等，并对各种试剂具有活化性质，还能与其它高沸点溶剂混溶；具有极好的稳定性，在热的强碱和酸性条件下都很稳定，还具有耐水性及对光、氧的稳定性。

The wearing of gloves is more common, as is the taping shut—rather than the DNA-laden licking—of envelopes. Investigators comb crime scenes ever more finely for new kinds of evidence, which is creating problems with the tracking and storage of evidence, so that even as the criminals leave fewer traces of themselves behind, a backlog of cold-case evidence is building up.

戴手套更加常见，as is the taping shut—rather than the DNA-laden licking—of envelopes调查者得比以前更加仔细的梳理犯罪现场以找寻新的证据，以便在罪犯留下更少的犯罪线索的情况下，也可以建立牢固的证据，这给记录和储存证据带来新的麻烦。

Self-comparison experiments with the same kind of tissue and differential expression experiments with the different kinds of tissue have been done to verify the reproducibility and the accuracy of this technique. The parameter of the reliability and the reproducibility of the micriarray data were analyzed by correlation coefficient, coefficient of variation and false positive rate etc. Meanwhile, the error resource also has been inspected.

通过同种组织RNA自身比较实验及不同组织RNA的差异分析实验对cDNA芯片实验的重复性进行检验，利用相关系数（correlation coefficient，R）、变异系数（coefficient of variation，CV）和假阳性率（false positive rate，FPR）分析cDNA芯片数据的可靠程度，对cDNA芯片实验数据作了整体的评估。

Self-comparison experiments with the same kind of tissue and differential expression experiments with the different kinds of tissue have been done to verify the reproducibility and the accuracy of this technique.The parameter of the reliability and the reproducibility of the microarray data were analyzed by correlation coefficient,coefficient of variation and false positive rate etc.Meanwhile,the error resource also has been inspected.

通过同种组织RNA自身比较实验及不同组织RNA的差异分析实验对cDNA芯片实验的重复性进行检验，利用相关系数（correlation coefficient，R）、变异系数（coefficient of variation，CV）和假阳性率（false positive rate，FPR）分析cDNA芯片数据的可靠程度，对cDNA芯片实验数据作了整体的评估。

In particular, prepositional phrases beginning with 'of' are very common, because they can express many different kinds of relationship between the two noun groups.

在一些特例中，因为他们能表达这二个名词小组之間的许多不同类型的关系，所以经常有前置的短语用"of"开始。

Fire is significant among disasters in urban area. The occuring frequency of fire is the highest among all kinds of disasters, and the loss due to fire is about five times of that due to earthquake. At the present, the tasks such as searching fire control information, disposing alarm telephones and make dispatch, are still accomplished in manual manner domestically. Current commanding system of fire fighting drops behind the development of cities, so that the setout time of fire companies is delayed.

中文题名城市消防指挥系统中的GIS和虚拟现实应用技术副题名外文题名 The application technology of GIS and VR in commanding system of fire fighting for urban area 论文作者许云导师任爱珠教授学科专业防灾减灾工程及防护工程研究领域\研究方向学位级别博士学位授予单位清华大学学位授予日期2002 论文页码总数115页关键词地理信息系统虚拟现实消防指挥系统火灾馆藏号BSLW /2003 /TU998.1 /4 火灾是城市灾害中的重要灾种，其发生频度居各灾种之首，造成的直接损失约为地震的五倍。

Language Translation Translation of Language Species Britain, Japan, Germany, France, Russia, Italy, South Korea, Mongolia, Thailand, Myanmar, Portugal, Spain, Finland, Vietnam, Netherlands, Bulgaria, the Czech Republic, Hungary, Poland, Romania, Yugoslavia / Serbia, Turkey, Sweden, Denmark, Norway, Arab, Malay, Indonesian, Hebrew, Greek, Arab, Persian, Slovakia, many ulu / Pakistan, Bangladesh, Indonesia / Malaysia, Latin and other 72 kinds of languages.

翻译语种 Translation of Language Species 英、日、德、法、俄、意、韩、蒙、泰、缅、葡萄牙、西班牙、芬兰、越南、荷兰、保加利亚、捷克、匈牙利、波兰、罗马尼亚、南斯拉夫/塞尔维亚、土耳其、瑞典、丹麦、挪威、阿拉伯、马来、印尼、希伯莱、希腊、阿拉伯、波斯、斯洛伐克、乌鲁多/巴基斯坦、孟加拉、印度尼西亚/马来西亚、拉丁文等72种语种。

Kinds of is followed by a plural or uncountable noun.

Kinds of 后接复数名词或不可数名词。

The hotel［hEu5tel］ offers［5CfEz］ its guests［gests］ a wide variety［vE5rBiEti］ of amusement.

济南晚上有各种各样的娱乐活动。（all kinds of各种各样的

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。