Crystal Structure of a Novel Cadmium Coordination Polymer [Cd15（OH）4（SO4）4（L1）6（L2）12]n （HL1 = 1,2,3-1H-Triazole,HLe = 5-Methyl-lH-tetrazole

A novel cadmium coordination polymer [Cdls（OH）4（SO4）4（L1）6（L2）12]n （HL1 = 1,2,3-1H-triazole, HL2 = 5-methyl-lH-tetrazole） has been synthesized and characterized by elemental analysis and single-crystal X-ray diffraction. The compound crystallizes in cubicI-43d space group with a = 21.5247（4）, V = 9972.7（3） A3, Z = 4, Dc = 2.360 g/cm3, Mr = 3543.68, μ（MoKα） = 3.298 mm^-1, F（000） = 6696, the final R = 0.0340 and wR = 0.0992 for 1909 observed reflections （I 〉 2σ（I））. The compound contains two crystallographicatly independent Cd coordination centers linked up through one L1 and two L2 bridges. The structure displays an inorganic-organic hybrid cadmium coordination polymer.     

原子吸收光谱仪的升级改造

本文对原子吸收光谱仪的升级改造进行了探索，使用先进的计算机控制技术，取代原仪器故障频繁的数据处理及记录部分，使升级改造后的仪器在分析精度，分析速度，自动化程度等方面大大提高，该技术一个突出的特点是：软件全部在中文Windows 下操作，更适合国情。     

Maximum work configurations of finite potential capacity reservoir chemical engines

An isothermal endoreversible chemical engine operating between the finite potential capacity high-chemical-potential reservoir and the infinite potential capacity low-chemical-potential reservoir has been studied in this work.Optimal control theory was applied to determine the optimal cycle configurations corresponding to the maximum work output per cycle for the fixed total cycle time and a universal mass transfer law.Analyses of special examples showed that the optimal cycle configuration with the mass tr...     

An Efficient Synthetic Method of 11,12-DihydroxylEudesmanolide Sesquiterpenoid from a-Santonin

11,12-dioxygenated eudesmanolide sesquiterpenoid is a large kind of naturally occuring sesquiterpenoids isolated from the medicinal plants, such as J. glutinosa1 and Flourensia heterolepsis 2. In constrast to much investigation of their isolation and structure characterization, the less about their synthesis have been reported. One of the reason may be the difficult hydroxylation at C-11. For example, the synthesis of a simple natural product, kudtriol3, required thirteen steps of reactions f…     

Studies on the Epoxidation of Styrene with Hydrogen Peroxide Catalyzed by MCM-41 Supported Co(II) Phenanthroline Complex

The epoxide is a kind of versatile intermediate for manufacture of a wide variety of fine chemicals. The goal of modem efficient catalytic methods is to produce desired compounds with high yield, selectivity, low cost, safety, operational simplicity and more importantly environmentally benign manner. However, there are various oxidants, which are often hazardous or expensive, being used for both laboratory and industrial epoxidation. Hydrogen peroxide (30 wt%) solution is thought as one of the ideal oxidants because water is a sole theoretical side product. Meanwhile the epoxidation of styrene is a typical one among olefins. Here, the performance of styrene epoxidation was studied with hydrogen peroxide solution catalyzed by Co(Ⅱ) phenanthroline complex encapsulated in supercages of MCM-41.     

100MeV负氢回旋加速器高频冷模腔的理论与实验研究

在回旋加速器中,高频系统为带电粒子加速提供能量,高频谐振腔作为高频系统中的关键部件,它性能的好坏直接决定着粒子是否能够被加速,所以,高频谐振腔的设计非常关键.在100MeV负氢回旋加速器的设计中,在空间限制的同时,要求加速电压从中心区的60kV到出引区的120kV变化,这对谐振腔的设计提出了很高的要求.基于上述条件,本工作利用有限差分法的软件CST MICR0wAVESTUDIO设计的双内杆结构的44MHz高频谐振腔初步设计完成,根据初步设计的结论,加工与实际腔体尺寸1:1模型,模型高频参数测量的结果与CST MICROWAVE STuDIO的计算相吻合,结果是可信的.     

含稀土合金锌粉的制备及性能

从酸性氯化物电解液体系电解共沉积Er-Pb-In-Zn合金锌粉，通过析氢及TAFEL极化测定，比较加入稀土后耐蚀性的变化，电解液中加入不同缓蚀剂后合金锌粉耐蚀性变化；通过循环伏安测定合金锌粉制成的电极的循环寿命；以合金锌粉为负极活性材料，组装成LR6实际电池，其放电性能与加汞电池基本相当。     

基于生活水平货币度量的助学贷款被助者的经济效益研究

随着国民经济的增长以及教育成本的提高,大学学费也相应逐年提高.但是我国还存在相当数量的贫困生.助学贷款是解决贫困生完成学业的重要途径.论文站在助学贷款被助者的立场上,将被助者获得的经济效益进行了具体的定量化分析.首先分别讨论了两期不考虑银行利息率和考虑银行利息率情况下,基于CES型效用函数的助学贷款被助者经济效益的计算模型,然后分析了如何计算多期银行利息率情况下贷款被助者的经济效益.最后针对被助群体进行实证分析、计算并得出结论.     

RF system design and measurement of HIRF-CSRe

An RF system for the CSRe (cooling storage experimental ring) is designed and manufactured domestically. The present paper mainly describes the RF system design in five main sections:ferrite ring, RF cavity, RF generator, low level system and cavity cooling. The cavity is based on a type of coaxial resonator which is shorted at the end with one gap and loaded with domestic ferrite rings. The RF generator is designed in the push-pull mode and the low level control system is based on a DSP+FGPA+DDS+USB interface and has three feedback loops. Finally we give the results of the measurement on our system.