多孔硅的表面碳膜钝化

报道对多孔硅（ＰＳ）进行碳膜（ＣＦ）钝化处理的结果。红外吸收光谱表明,经钝化处理样品的表面由Ｓｉ－Ｃ、Ｓｉ－Ｎ和Ｓｉ－Ｏ键所覆盖;荧光我谱表明,经钝化处理的样品较未处理的样品发光强度提高４￣４．５倍,且发光峰位明显蓝移;存放实验显示,经钝化处理的样品发光强度稳定、发光峰位不变。这些结果表明正丁胺可以在多孔硅表面形成优良的钝化碳膜,是一种十分有效的多孔硅后处理途径。     

光谱法研究人发,指出中锰,镍含量 变化曲线的特征

在近１０年内按季度收集了同一个人的头发样品３３份和指甲样品,４１份,应用火焰原子吸收光谱法测定了人发和指甲中的锰和镍含量,并分别绘制锰和镍随时间（年）变化曲线,获得锰含量波动范围;人发中０．２１００－１．５００μｇ／ｇ、指甲中０．８３００－２．３９１μｇ／ｇ;镍含量波动范围;人发中０．４９００－１．７５０μｇ／ｇ、指甲中１．１７９－４．１８４μｇ／ｇ。含量变化曲线均具有非线性特征。     

江西省社会发展评价指标体系的建构及对各地市的评价

本文介绍了由本省省情构建的一套江西省社会发展评价指标体系,并用系统工程和计算机技术对全省11地市1988至1990年三年间的社会发展进行综合评述。     

运动稳定性的研究进展和趋势

本文概述运动稳定性学科在力学系统、控制系统、大系统、冲击系统、不确定系统以及一般理论等方面的研究进展和趋势。      

杂多三金属磷酸盐的合成与表征

早期合成的Keggin结构杂多酸均是同种齿顶原子,后来人们合成了一系列含两种齿顶原子的三元杂多酸~[1,2],我们曾制备了含3种齿顶原子的四元杂多酸~[3,4].随着齿顶原子种类的增多,杂多酸在水溶液中的稳定性降低.本文采用空缺杂多酸阴离子逐步与不同齿顶原子结合,最后用溶解度极小的(C_1H_9)_4N~+盐沉淀方法合成了未见报道的磷的四元杂多酸盐.     

A Reflectance Thin-layer Spectro-electrochemical Method

IntroduCtion Speetroeleetroehemieal measurement 15 simultaneously to determine theeleetroehemieal and speetral     

Large Matrix Computations on Vector Computers

Preconditionings have proved to be a powerful technique for accelerating the rate of convergence of an iterative method. This paper, which is concerned with the conjugate gradient algorithm for large matrix computations, investigates an approximate polynomial preconditioning strategy. The method is particularly attractive for implementation on vector computers.     

A Catalytic Enantioselective Synthesis of Biologically Interesting Cyclopropane Amines

The synthesis of cyclopropane amine has attracted considerable interest from organic chemists because of the biologically importance and its occurrence in numerous natural products¹. Several synthetic cyclopropane amines have been used as drugs, e.g. the monoamine oxidase inhibitor tranylcypromine (1)². However, it has been found that two enantiomers of chiral cyclopropane amine have different pharmacological effects³,which demands organic chemists to develop efficient methods to prepare them enantioselectively. Previous synthesis of enantiomerically pure cyclopropane amines involves resolution of racemic cyclopropane carboxylic acid followed by Curtius degradation⁴.     

On discrete supports and continued support of structures

There have been several papers dealing with elastic discrete supports of structures. And we are interested in what relation there is between elastic discrete supports and continued support and what difference would result in for dynamic properties of structures under the two kinds of support. Through the present analysis, it is pointed out that natural frequencies reflect a certain proportion of kinetic and potential energies in total energy of a system, and the frequencies can be guaranteed to be invariable in transforming between elastic discrete and continued supports by means of a proper energy equivalence. And the theoretical formulation of beams and numerical results of shells of revolution are presented in this paper.     

我国运动稳定性研究的新进展

综述了近年来我国运动稳定性(包括力学系统、控制系统、人口系统、生态系统和大系统的稳定性)及其一般理论的研究进展。