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Determination of the Atomic Weight of Germanium

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Chinese Chemical Letters 1997年第9期8卷 837-840页

作者： Chang, TL Qiao, gs BEIJING UNIV DEPT CHEMBEIJING 100871PEOPLES R CHINA ACAD SINICA INST GEOLBEIJING 100029PEOPLES R CHINA

The atomic weight of germanium was determined as A(r)(Ge) = 72.6284(22). Application of substitute calibration using the true isotopic ratio of Ga-69/71 results in A(r)(Ge) = 72.6389(29), both on 2 sigma basis.

关键词： Determination of the Atomic Weight of Germanium Rev Res

Determination of the Atomic Weight of Samarium

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Chinese Chemical Letters 1997年第1期8卷 91-94页

作者： Chang, TL Qiao, gs BEIJING UNIV DEPT CHEMBEIJING 100871PEOPLES R CHINA CHINESE ACAD SCI INST GEOLBEIJING 100029PEOPLES R CHINA

The atomic weight of samarium was redetermined as A(r)(Sm) = 150. 3661(2). Application of substitute calibration using the true isotopic ratio of Eu-151/153 results in A(r)(Sm) = 150. 3740(10). A summary is given incl... 详细信息

关键词： Determination of the Atomic Weight of Samarium

A procedure of determining potential energy surfaces of triatomic molecules from inversion of spectroscopic data

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Chinese Journal of Chemistry 1995年第6期13卷 510-514页

作者： Xie, DQ Yan, gs Tian, AM SICHUAN UNIV DEPT CHEMCHENGDU 610064SICHUANPEOPLES R CHINA

In this paper, we have suggested an iterative procedure of optimization of the linear parameters in an analytic potential energy function for a triatomic molecule, by combining both variational and second order perturbation methods. The most important feature of this procedure is that the objective function is an analytical expression which can be optimized easily. The application to the water molecule is presented.

关键词： potential energy surface triatomic molecule molecular vibrations variational method

Sputtering Rates of Alloys in Glow Discharge

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Journal of Materials Science & Technology 1995年第4期11卷 295-298页

作者： REN, JS ZHANG, gs WANG, ZS ZHAO, JW SHANGHAI UNIV SCI & TECHNOL SHANGHAI 200072PEOPLES R CHINA

The sputtering rates of alloys were investigated under constant Ar pressure and voltage supplied. The alloys studied in this work range from binary intermetallic alloys to ternary and quaternary alloys. It is revealed that the sputtering rates of alloy targets under steady states are q = 1/Sigma C-i/q(i)(0) where q is the sputtering rates of alloys, C-i the weight percentage of i-th component in the alloy, and q(i)(0) the sputtering rate of pure metal of i-th component.

关键词： Binary alloys

Microstructure of Al-Si Alloys Rapidly Solidified from the Different Temperature Melts

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Journal of Materials Science & Technology 1999年第3期15卷 225-228页

作者： Gui, MC Jia, J Song, gs Li, QC Beijing Inst Aeronaut Mat Natl Key Lab Adv Composites Beijing 100095 Peoples R China Harbin Inst Technol Harbin 150001 Peoples R China

Hypo- and hyper-eutectic At-Si alloys were rapidly solidified from the tow or high temperature melt using water quenching and melt-spinning technique. The differences in microstructure of rapid solidification alloys were studied by scanning and transmission electron microscopy, and X-ray diffraction methods. The primary silicon in the Al-22(wt pct)Si alloy quenched in room temperature water from high temperature melt was smaller than that quenched from low temperature melt. Compared with the ribbons spun from low temperature melt, the ribbons spun from high temperature melt had finer Al-rich and Si-rich phase particles in either Al-7(wt pct)Si or Al-18(wt pct)Si alloy. The mechanism was explained by the nature of the liquid structure.

关键词： Aluminum alloys

Recognition Interactions of Metal-complexing Imprinted Polymer

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Chinese Chemical Letters 2005年第6期16卷 797-800页

作者： Liu, Y Ding, gs De Wang, J Chinese Acad Sci Dalian Inst Chem Phys Dalian 116012 Peoples R China

Molecularly imprinted polymer, exhibiting considerable enantioselectivity for L-mandelic acid, was prepared using metal coordination-chelation interaction. By evaluating the recognition characteristics in the chromatographic mode, the recognition interactions were proposed: specific and nonspecific metal coordination-chelation interaction and hydrophobic interaction were responsible for substrate binding on metal-complexing imprinted polymer; while the selective recognition only came from specific metal coordination-chelation interaction and specific hydrophobic interaction.

关键词： Molecularly imprinted polymer metal coordination-chelation interaction recognition interaction enantioseparation.

Chiral separation of triazole pesticide enantiomers by high performance liquid chromatography

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Chinese Journal of Chemistry 1997年第6期15卷 528-533页

作者： Yang, gs Gao, RY Wang, QS Shen, HX Shandong Univ Dept Chem Jinan 250100 Shandong Peoples R China Nankai Univ Natl Lab Elementoorgan Chem Tianjin 300071 Peoples R China Nankai Univ Dept Chem Tianjin 300071 Peoples R China

Four triazole enantiomers of diclobutrazol (erythro form) (1), paclobutrazol (erythro form) (2), diniconazole (3) and uniconazole (4) have been separated by high performance liquid chromatography (HPLC) on chiral stationary phase (CSP) OA-4700. Chromatographic data, and a chiral recongnition model are presented for the separation of these pesticide enantiomers. The influence of column temperature and composition of mobile phase have been described.

关键词： triazole pesticide enantiomeric separation chiral stationary phase (CSP) high performance liquid chromatography (HPLC)

Chemisorbed　dimethylammonium　chlorochromate　as　selective　oxidants　for　primary　and　second　aryAlcohols

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Chinese Chemical Letters 1996年第11期7卷 973-974页

作者： Zhang, gs Shi, QZ Chen, MF Cai, K HENAN NORMAL UNIV DEPT CHEMXINXIANG 453002PEOPLES R CHINA

Two new reagents. dimethylammonium chlorochromale adsrbed on alumina and silicagel are describe as convenient reagents for efficient oxidation of a variety of primary and secondaryalcohols. These two reagents are very... 详细信息

关键词： selective and aryAlcohols chlorochromate dimethylammonium oxidants primary Chemisorbed

Surface Modification of Silica Gels as Carrier for AminoacylaseImmobilization

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Chinese Chemical Letters 1998年第2期9卷 161-163页

作者： Liu, LJ Qiu, gs Zhuo, RX Pan, ZT Wuhan Univ Dept Chem Wuhan 430072 Peoples R China

The surface of silica gels was modified by an diethylamino group and an hydroxy group, simultaneously. The activity of the aminoacylase immobilized on such amino-hydroxy-silica gels was 316.8 U/g. By its catalysis, th... 详细信息

关键词： immobilized aminoacylase silica gels surface modification resolution amino acid