Monitoring the Aggregation of Dansyl Chloride in Acetone through Fluorescence Measurements

The aggregation of dansyl chloride (DNS-Cl) in acetone has been studied in detail by steady-state fluorescence techniques.It has been demonstrated that DNS-Cl is stable in acetone during purification and aggregation study processes.The aggregates are not solvolyzed in acetone,and do not take part n any chemical reactions either.It has been found that DNS-Cl tends to aggregate even when its concentration is much lower than its solubility in acetone.The aggregation is reversible,and both the aggregation and the deaggregation are very slow processes.Introduction of SDS has a positive effect upon the formation and stabilization of the aggregates.     

Effect of ligand structure of stationary phase of high performance hydrophobic interaction chromatography on renaturation efficiency of GuHCl-denaturedα-chymotrypsin

The renaturation of the denaturedα-chymotrypsin (α-Chy) with 1.7 mol·L-1 gua-nidine hydrochloride (GuHCI) by three kinds of stationary phase of high performance hydropho-bic interaction chromatography (STHIC) with a comparable hydrophobicity but different ligand structures was investigated. The obtained result indicates that the ligand structures of the three STHIC contribute to the renaturation efficiency ofα-Chy in the order of the end ligands PEG-600< phenyl group < tetrahydrofurfuryl alcohol (THFA).     

宽端接圆柱杆的复合指数形变幅杆的设计

利用替代法得到了复合指数形变幅杆的频率方程,在此基础上解算出谐振长度、放大系数等重要参数,并借助于ANSYS软件对复合变幅杆进行模态分析.结果表明该方法对复合形变幅杆的设计是可行的,也显示了ANSYS在变幅杆设计中的重要性.这给其他复合变幅杆的设计提供了参考.     

废旧电池中的重金属对人体的危害

讨论了废旧电池对环境的致毒作用和对人体健康的危害，介绍了废旧电池中重金属在生物体中的吸收、转化、分布、作用部位及毒性，指出人类社会的可持续性发展与自然生态循环的协调一致要求从源头上制止污染，而不是在术端治理污染，即从根本上改变人类的物质生活方式，重新回到生态系统的框架之内。     

平移空间的线性结构

本文证明了在平移空间上可利用距离在一定条件下构作出线性结构,引入了次范整线性空间的概念,还证明了平移空间是次范整线性空间当且仅当它的平移群是Abel群.泛函分析学中的有界线性算子定理,Hahn-Banach定理以及共鸣定理都可以移植于次范整线性空间之中.     

Magnesium bistrifluoromethanesulfonimide as an efficient catalyst for the hydroalkylation of aromatic olefins with 1,3-diketones under solvent-free conditions

An efficient magnesium bistrifluoromethanesulfonimide[Mg(NTf_2)_2]catalyzed hydroalkylation of aromatic olefins with 1,3- diketones under solvent-free conditions has been developed.The reactions proceed smoothly to give the desired products in good yields in short reaction times.     

幂数级代数与导子的自动连续性

本文研究以Banach代数A上的幂级数拓扑代数A[[X]]及A上的幂级数Banach代数ф_A为定义域的导子的自动连续性,同时也给出了有关导子的一般形式.     

氯化三烷基苄基铵萃取分离铼钼的研究

本文研究了用氯化三烷基苄基铵(7407)萃取分离铼钼的工艺条件。结果表明,7407是铼钼分离的有效萃取剂,铼钼分离系数为2362。经3次逆流萃取,铼和钼的萃取率分别为:99.60%和3.37%。用40%硫氰酸铵溶液对富有机进行3次逆流反萃取,铼的反萃率为99%。萃取剂可再生循环使用。     

随机变量的函数相关性

引入了“曲线分布密度函数”的定义;给出了由边缘密度及两个随机变量间的函数式表示曲线分布的解析表达式;研究了曲线分布密度的简单性质及由它求两个随机变量间的函数式和边缘密度的公式;对有一般函数关系的两个随机变量,推导出条件分布函数、条件分布列及条件数学期望的分析式。     

Analysis and Protection of One Thousand Hand Buddha in Dazu Stone Sculptures

The components of the rock, the pigments, the gold foils and the adhesive of One Thousand Hand Buddha in Dazu stone sculptures, Chongqing, China, have been analyzed by X-ray diffraction (XRD), X-ray fluorescence (XRF), infrared spectroscopy (IR), energy dispersive X-ray analysis (EDX) and fiber optics reflectance spectroscopy (FORS). Furthermore, the weathering and degeneration of One Thousand Hand Buddha have been discussed and the protective methods have been provided. In this work some useful information to study on conservation of stone relics is given.