藏药五脉绿绒蒿化学成份的研究Ⅰ

本文报道从藏药五脉绿绒蒿中分到的3个化合物,经光谱方法证明它们是5.5’—双氧甲基呋喃醛(1),2—羟乙酰基—呋喃(2),mecambridine(3)。(1)和(2)以前在绿城蒿属植物中没有发现过。     

固相配位化学反应研究ⅩⅩⅩⅡ—水五氨合钴(Ⅱ)、铬(Ⅲ)配合物与氢氧化钾固相反应

由气相色谱流出气体分析数据,采用Coats—Redfern公式计算了三溴化一水五氨合钴、三硝酸一水五氨合铬(Ⅲ)、六氰合钴酸一水五氨合钴与氢氧化钾双起始组分固相反应活化能,结果表明固体氢氧化钾使上述配合物氨配体解离活化能大幅度降低,导致氨配体与配位水同时逸出。     

甲苯的硝酸-离子交换树脂硝化及动力学研究

该文以硝酸-离子交换树酯作为硝化剂,对甲苯进行一段硝化,结果可以有效地降低邻硝基甲苯和对硝基甲苯之比(O/P)。文中给出了一组正交实验结果,在优化所得的反应条件下可以使O/P降至0.65。同时利用气相色谱研究了该体系在树脂表面所进行的固液催化反应动力学,并将实验所得的活化能数据与文献报道的混酸硝化体系中的值相比较,解释了该硝化体系中能使O/P下降的原因。     

AN EXAMINATION OF THE INFLUENCE OF STABILIZERS ON THE PHOTOCHEMICAL STABILITY OF DISPERSE DYES

There is a powerful market-need for superfast disperse dyes in special use, e.g. for automotivefabrics. The photochemical fading reactions of dyes are often very complicated, and no singlphotodegradation pathway can be involved for all kinds of dyes. To enhance the photostability of the commonly used disperse dyes, a series of tests on the ef-fect of variable stabilizers on the photodegradation rate of nine representative disperse dyes werecarried out both in ethyl acetate solution and on cellulose acetate film. A moderate light sourceemitting above 300 nm was adopted in this study to simulate the photofading under practical appli-cations. The results show that, in solution, 2,2,6,6-tetramethyl-piperidine is the most effectivegeneral stabilizer for all the tested dyes, but on cellulose film, nickel diethyl-dithiocarbamateshows the greatest general protecting effect, and a synergistic effect is observed for special combina-tions of stabilizers.     

NONLINEAR ELASTICITY OF BLOOD ARTERIAL DUCT

The paper deals with nonlinear elasticity of blood arterial duct, in which the artery is modeled to bea locally triclinic, transverse isotropic, incorapressible, axisymmetric and thickwalled tube with large deformations, The nonlinear coustitutive relationship of arterial tissues is based on the theorv of Green and Adkins. A nonlinear strain energy density function is introduced for nonlinear stress-strain relationship of second order, in which the coefficient of each term is expressed by means of a Lame’s constant, The elasticity constants are nqcessary to describe such a uonlinear finite strain etastieity of the second order, These constants are determined by means of the stress-strain increment theory.     

离散非均匀非线性Schrodinger方程的数值研究

本文用数值方法研究了商教非线性非均匀Schrodinger方程,讨论了孤子被势垒,势阱散射的性质,计算结果表明,在非均匀的一维分子链上的长距离输运也是可能的。     

小鼠阑尾淋巴组织的发生

对不同日龄幼鼠阑尾淋巴组织的发生、T和B细胞在阑尾中出现的时间及分布的系统研究表明:小鼠阑尾淋巴组织是在出生后逐渐发育形成的.幼鼠出生当日,在其阑尾内固有膜增厚,在淋巴滤泡原基中已具有成熟的T淋巴细胞和较成熟的B淋巴细胞.出生后随着淋巴滤泡的发育及肠道内抗原的刺激,T和B淋巴细胞数目逐渐增多,最终分别定位分布于淋巴滤泡的滤泡间区与滤泡区内.     

一类非驻定系统零解的稳定性

本文研究了线性微分方程dx/dt=A(t)x及一般形式的非线性微分方程组dx/dt=A(t,x)x的零解在Lyapunov意义下的稳定性问题,并给出了零解稳定、渐近稳定和不稳定的判定准则.