检索结果-南通市图书馆

LANGMUIR－BLODGETT　FILM　OF　STRONG　LUMINESCENT　EUROPIUM　DIBENZOYLMETHANE　COMPLEXES

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 1995年第10期6卷 903-906页

作者： Zhou, DJ yao, gq Huang, CH Bai, J Li, TK Beijing Univ State Key Lab Rare Earth Mat Chem & Applicat Beijing 100871 Peoples R China Acad Sinica Inst Photog Chem Beijing 100101 Peoples R China

Two strong fluorescent amphiphilic europium-dibenzoylmethane complexs Me3NC 16,H33.F(DBM)(A) and ***(DUM)4 (B) have heed synthesized and1 their Langmuir films have been formed at theair/water *** Langmuir film of of A can be easily transferred onto hydrophific substrates with transferratio around unity to huild up Langmuir-Blodgett(LB)*** LB films were characterized by UV-vis speetraand low-angle X-ray diffraction. Their fluorescence spectra and fluorescence lifetime have heen studied both insolution and highly ordered LB films.

关键词：

在线全文

学校读者我要写书评

暂无评论

对某基层医院住院医师规范化培训的几点建议

中国中西医结合急救杂志 2018年第3期25卷 305-307页

作者：赵志伶陈吉红韩旭么改琦李银平北京大学第三医院危重医学科 100191 甘肃省环县人民医院医务科甘肃庆阳745000 甘肃省环县人民医院重症医学科甘肃庆阳745000 天津市天津医院 300211

目的探讨基层医院住院医师规范化培训的相关问题，为基层住院医师规范化培训提供依据。方法通过问卷方式，调研甘肃省环县人民医院医师职称、住院医师年龄和学历分布情况，分析对该院住院医师的工作胜任力自我评价以及需要提高的内容，... 详细信息

目的探讨基层医院住院医师规范化培训的相关问题，为基层住院医师规范化培训提供依据。方法通过问卷方式，调研甘肃省环县人民医院医师职称、住院医师年龄和学历分布情况，分析对该院住院医师的工作胜任力自我评价以及需要提高的内容，提出基层医院医师需要改进的内容。结果甘肃省环县人民医院共有住院医师52名，46名参加调查，参与率88．5％。甘肃省环县人民医院医师职称以住院医师为主，占43．3％（52／120），年龄主要分布在31-35岁，学历大专占42．3％（22／52），本科占48．1％（25／52），该院76．1％（35／46）的住院医师认为胜任住院医师有一定困难，71．7％（33／46）的住院医师认为需要加强临床思维和临床技能的培训。结论加强住院医师自身学历提升，完善医院教学制度，加强教学管理，针对临床思维和临床技能培训是基层医院目前规范化培养的主要问题。加速住院医师规范化培训完善向中级医师的转化，改善不合理医师结构是基层医院发展的关键所在。

关键词：住院医师规范化培训基层医院

POTENTIAL INVERSION PROBLEMS FOR COUPLED SYSTEM OF DOWNGOING AND UPCOMING ONE-WAY WAVE EQUATIONS

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Computational Mathematics 1998年第6期16卷 551-560页

作者： Zhang, gq Dou, XL Chinese Acad Sci ICMSEC State Key Lab Sci & Engn Comp Beijing 100080 Peoples R China Beijing Res Inst Remote Sensing Informat Beijing 100011 Peoples R China

By using wave splitting method the formulation of the two-dimensional potential inversion problem is set up in terms of the coupled system for downgoing and upcoming wavefields. The boundary counditions on the characteristic surface needed for solving the problem are derived by singularity analysis. Two stability theorems are given for the direct problems of the system treated as Cauchy problems in the direction of depth.

关键词： 2-D potential inversion wave splitting singularity analysis

LAYER STRIPPING METHOD FOR POTENTIAL INVERSION

在线全文

学校读者我要写书评

暂无评论

Journal of Computational Mathematics 1999年第1期17卷 25-32页

作者： Dou, XL Zhang, gq Chinese Acad Sci ICMSEC State Key Lab Sci & Engn Comp Beijing 100080 Peoples R China Beijing Res Inst Remote Sensing Informat Beijing 100011 Peoples R China

To solve the potential inversion problem of the coupled system for one-way wave equations, the absorbing boundary conditions in the lateral direction are derived. The difference schemes are constructed and a layer str... 详细信息

关键词： 2-D potential inversion layer stripping method absorbing boundary condition

Synthesis of the optically pure 5,5"-dihydroxy-7,7"-dimethoxy-8,8"-biflavone and its derivatives

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemistry 1997年第5期15卷 464-471页

作者： Zhang, FJ Lin, gq Chinese Acad Sci Shanghai Inst Organ Chem Shanghai 200032 Peoples R China

(+/-)-5,5 '-Dihydroxy-7,7 '-dimethoxy-8,8 '-biflavone ((+/-)-1) was resolved into its optically pure forms via the formation and recrystallization of its (2R)- and (2S)-1-(4-toluenesulfonyl)prolylate, and the methylated derivatives of (+)- and (-)-1 were also prepared. The absolute configurations of all these 8,8 '-biflavones have been confirmed by their CD spectra.

关键词： 8,8 ''-biflavones synthesis optical resolution absolute configuration CD spectra

Lipases catalyzed acetylation of meso-2,4-dimethyl-1,5-pentanediol and the synthesis of Prelog-Djerassi lactone

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemistry 1995年第4期13卷 380-384页

作者： LIN, gq XU, WC CHINESE ACAD SCI SHANGHAI INST ORGAN CHEMSHANGHAI 200032PEOPLES R CHINA

Lipase catalyzed acetylation of 2 afforded 3 with the e.e. up to 98%. Utility of 3 was illustrated by the preparation of Prelog-Djerassi lactones 7a and 7b.

关键词： LIPASE (2R,4S)-5-ACETOXY-2,4-DIMETHYL-PENTANOL PRELOG-DJERASSI LACTONE

Sealing Interfaces of Pin in Colour Picture Tube

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 1996年第1期12卷 78-80页

作者： Wang, gq Tang, XY Ma, JS Dept. of Materials Science and Engineering Tsinghua University Beijing 100084 China

interfacial geometric morphology, chemistry and microstructure have been studied by SEM, EDAX, HREM, and XPS. It is found that the oxide scale/metal interface consists of two layers. The first one is amorphous SiO2 growing inward metal matrix, and the second one under the first layer is TiO2 distributing in metal matrix. There is microstructural transition zone at Cr2O3/SiO2 interface, and an atomic mixed zone with 8 nm width at SiO2/metal interface. The transition zone which is saturated with Cr diffusing from oxide scale exists at the oxide scale/glass interface. The reasons why sand-blasting process can improve bonding strength of the oxide scale and the metal are also discussed. The ideal interfaces are proposed finally.

关键词： Television picture tubes

The Stereoselective Formal Synthesis of (-)-Slaframine

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 1998年第11期9卷 999-0,0-0页

作者： Dong, HQ Lin, gq Chinese Acad Sci Shanghai Inst Organ Chem Shanghai 200032 Peoples R China

The stereoselective synthesis of (-)-slaframine has been achieved by utilizing the Sharpless asymmetric epoxidation of divinylcarbinol (2) and the regio-selective dihydroxylation of compound 4 as the key steps.

关键词： (-)-slaframine divinylcarbinol Sharpless asymmetric epoxidation Sharpless asymmetric dihydroxylation

The Formal Stereoselective Synthesis of(+)-Preussin

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 1997年第8期8卷 693-694页

作者： Dong, HQ Lin, gq CHINESE ACAD SCI SHANGHAI INST ORGAN CHEMSHANGHAI 200032PEOPLES R CHINA

The stereoselective synthesis of (+)-preussin has been achieved by utilizing the Sharpless asymmetric epoxidation of the divinylcarbinol (3) and the oxidative cyclization of 9 with PDC as the key steps.

关键词： The Formal Stereoselective Synthesis of DMF 甲酰胺 Preussin