使工作

The experiment result shows, when extra magnetic field B=0, and supply voltage VDS is constant, inequipotential potentials VHO of the nc-Si/c-Si heterojunction MAGFET are close to zero output with increasing absolute value of the gate biased voltage VGS. Adopting gate biased voltage to compensate inequipotential potentials, compared with extra compensation resistance method, could improve magnetic sensor sensitivity, when supply voltage VDS is -1.0 V, magnetic sensitivity can be improved by 18%.

实验结果表明，当外加磁场B=0时，工作电压VDS恒定时，随栅极偏置电压VGS 绝对值增加，纳米硅/单晶硅异质结MAGFET不等位电势VHO逐渐接近零位输出；采用栅极偏置电压进行不等位电势补偿较外加补偿电阻方法可以使磁传感器灵敏度得到提高，在工作电压VDS为-1.0 V时磁灵敏度约提高18%。

Based on the rated voltage that the normally working load needs, this paper discusses that the load current is restricted by controlling the secondary current of series transformer so as to meet the invariableness of the rated voltage.

在负载正常工作时所需的额定电压的基础上，该文讨论通过控制串联变压器二次侧工作电流来约束负载电流，从而使负载电压恒定。

Second, it describes his contribution on geology: training large understanding talents;hardworking and setting himself an example to others when he was working in geological research institute and geological investigation institute, which setting up a exemplary person for Chinese geological scholar;his sincerely love to talents, his assigning magnanimously the Chinese, the foreigner, the old man and the younger to the post, making the geological investigable institute which he is in charge of becoming a famous science center in the world with in a short time;one of creators and founders in the Chinese modern geology and paleontology.

第二，论述了有关他在地质学方面的贡献：他为中国的地质事业培养了一大批优秀人才，在地质研究所和地质调查所工作时，不辞劳苦，以身作则，为中国地质学者树立了实地调查采集的工作模范；他真诚的爱护人才，热诚而大度的运用中、外、老、少各利人才，使他所负责的地质调查所在很短的时间之内成为一个世界知名的科学中心；他还是中国近代地质学和古生物学的开创人和奠基人之一。

Many people believe smoking brings many psychological benefits ,releves stresses of every day life ,and provides comstant consolation ,modern life is so fast and noisy ,especilly in large dities smokeing hel phem ot realx ,gives air life ,with beautifel girls ,true love and kees them goin g,rather like drinking tea or coffee.

许多人认为，吸烟可能会给人在心理上带来好处，消除日常生活的紧张，不断给人以安慰。现代生活熙熙攘攘节奏快，在大城市尤其如此。吸烟能使他们放松，给他们增加精力，并使他们继续工作下去，犹如喝茶、喝咖啡一样。

Things are going well enough that Mr Khoja now spends only a couple of weeks a month in Afghanistan, devoting the rest of his time to working for the Aga Khan Fund for Economic Development, and cheerleading abroad for Afghanistan.

公司发展势头良好，使库拉每月只需在阿富汗工作两星期，其余时间在阿迦汗经济发展基金会（Aga Khan Fund for Economic Development）工作，或在国外为阿富汗增光添彩。

Professor Konrad Jamrozik, of Imperial College in London.

伦敦皇家学院的康拉德·吉姆罗兹克教授在环境烟草大会上说，在酒馆、酒吧、饭店和旅馆，二手烟每年杀死49个工作人员，使全国的工作人员中的700人因为肺癌、心脏病以及中风而死亡。

The dissertation mainly consists of two parts:1. The Reaction Chemistry of Alkynes under Palladium Catalysis Part 1 studies the reaction α,β-unsaturated carbonyl compounds with alkenylpalladium intermediate generated by nucleopalladation, and discovered 1 the Pd-catalyzed tandem addition reaction of halides, alkynes and α,β-unsaturated carbonyls,2 the four-component tandem addition reaction of halides, alkynes and α,β-unsaturated carbonyls, 3 the tandem intramolecular oxypalladation-conjugate additionreaction of alkynoic acids with α,β-enals. These new reactions provide notonly efficient highly stereoselective methods for the synthesis of γ,δ-unsaturated,polyunsaturated carbonyl compounds and γ-lactonic aldehydes, but also thebasic transformations for a number of C-C bond formation reactions which can be usedto design synthesis of many acyclic, cyclic or polycyclic compounds.

本论文的主要工作分为两个部分：一、钯催化下炔烃的反应化学在本小组前人工作的基础上，我们详细研究了炔烃亲核钯化产生的烯基钯中间体与α，β-不饱和羰基化合物的反应，发现两价钯催化下卤离子-炔烃-α，β-不饱和醛酮的串联加成反应、卤离子-炔烃-α，β-不饱和醛酮的西组分串联加成及炔酸分子内氧钯化-串联Michael型加成反应；由此发展了γ，δ-不饱和醛酮、多不饱和羰基化合物和带有醛酮基侧链的γ-丁内酯衍生物的高立体选择性合成方法，这一过量卤离子存在下的烯基钯对α，β-不饱和羰基化合物共轭加成反应的发现，为大量碳-碳键形成反应的实现提供了基础，使我们能够从这一基本反应出发，设计和开发多种分子内、分子间的碳碳成键反应，以好的立体、区域选择性组建开链、环状及多环类型的化合物。

Our previous studies have shown that ubiquitous overexpression of HmgD caused hemocytes proliferation and the formation of melanotic tumors in the Drosophila larvae. To clarify the mechanism of melanotic tumors appearance,we also generated RT-PCR analysis to test the transcriptional changes of PPAE and Spn27A,which encode the key factors in the phenoloxidasecascade pathway from larvae samples of mid-third instar,late-third instar and prior to pupation relative to wild type flies.Our result showed that in the HmgD overexpression mid-third instar larvae,the expression level.of Spn27A was lower than wild type,otherwise the expression level of PPAE was higher than wild type.It suggests that overexpression of HmgD affects the PO cascade pathway.

本研究组前期工作发现，过量表达HmgD引起果蝇幼虫体内血细胞增生，并出现黑色素瘤，为探讨HmgD过量表达导致了血细胞增生即形成黑色素瘤的分子机制，本研究分别提取三龄中期、后期和相对于野生型化蛹前时刻的幼虫的RNA，首先检测了编码酚氧化酶级联反应途径中的两个关键基因PPAE，Spn27A在突变体中的转录发生变化，结果发现，Spn27A在三龄中期的表达量低于野生型，而PPAE的表达高于野生型，表明过量表达HmgD影响了酚氧化酶级联反应途径，低水平的Spn27A不足以抑制PPAE的活性，活化的PPAE催化了PPO的活性，使其转变成有活性的PO，从而促进黑色素的生成，使果蝇体内产生黑色素瘤。

Three part of research works had been carried out in the dissertation. The first part: a kind of multidentate amine modified silica gel was synthesized through the following steps:(1) introduce the amino groups onto the surface of silica-gel by the treatment of surface silanol groups withγ-aminopropyl trimethoxy silane;(2) michael addition of excess trihydroxymethyl propyl triacrylate to amino groups on the silica gel surface;(3) amidation of the unreacted double bonds of TMPTA on the surface of TMPTA modified silica gel with diethylenetriamine;(4) the multidentate amine modified silica gel was finally obtained by the reaction of amino groups on the surface of DETA modified silica gel with double bond of butyl acrylate.

本论文进行了三部分研究工作，第一部分：通过多步反应对硅胶进行改性合成了一种多齿胺改性硅胶配体，合成过程如下：1通过γ-氨丙基三甲氧基硅烷与硅胶表面的硅羟基反应，使硅胶表面带有氨基；2利用硅胶表面氨基与过量的三羟甲基丙烷三丙烯酸酯发生Michael加成反应；3利用二乙烯三胺与TMPTA改性硅胶表面未反应的双键发生反应使硅胶表面氨基化；4最后用丙烯酸正丁酯与DETA改性硅胶表面氨基充分反应成功合多齿胺改性硅胶配体。

Along with the fast fierce development that calculator apply,the application of network extends continuously,the people request to use these techniques urgently,and to carry on the online examination,the work burden and the exaltation work efficiencies that to release the teacher,also raised the quantity of the examination at the same time,thus make examination gradually notarize,objective,stir up the student's interest in the study more.

随着计算机应用的迅猛发展，网络应用不断扩大，人们迫切要求利用这些技术来进行在线考试，以减轻教师的工作负担及提高工作效率，与此同时也提高了考试的质量，从而使考试趋于公正、客观，更加激发学生的学习兴趣。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。