北祁连西段蛇绿岩型超基性岩铬尖晶石及对岩体含矿性的指示

产于超基性岩中的副矿物铬尖晶石化学成分复杂,物理性质稳定,抗蚀变能力强.本文通过对北祁连西段九个青羊等六个超基性岩体副矿物铬尖晶石化学成分标型特征,铬尖晶石种属的研究,并计算了铬尖晶石的两种含铁率,探讨了该区分布的蛇绿岩型阿尔卑斯超基性岩体的含矿性.     

内蒙古海拉尔盆地演化研究

海拉尔盆地的形成和演化可分为断陷和坳陷两个时期。断陷期又可分为5个阶段:孕育阶段、强烈拉张阶段、快速沉降阶段、稳定拉张阶段和萎缩阶段。坳陷期拉张减弱,有扭性作用,盆地变浅。因此,海拉尔盆地为一“断陷-坳陷”转化型盆地。     

宝塔罩型塔板的研究

宝塔罩型塔板是在新型垂直筛板(New VST)的基础上,提出的一种具有结构简单、生产能力大、工作范围宽、压降低和传质效率高的塔板。本文详述了该塔板的结构,以及流体力学性能和传质性能的实验结果。     

辣椒红色素提取工艺的研究

通过辣椒红色素提取过程的研究，确认色素提取过程为内扩散控制，利用管式提取法提取优于单级多次提取法，为工业生产过程的改进提供了依据。     

固定化酶不对称合成（S）＋—（＋）—布洛芬的研究

能够不对称水解布洛芬乙酯的酵母菌Ｔ１５８固定化在壳聚糖珠中，固定化酵母菌的活力回收达６０％，最适温度为４５℃，半衰期为７５ｄ以上。     

直接缩合法合成低分子量聚乳酸的研究

本文采用聚合反应－共沸精馏耦合的方法,直接缩合合成低分子量聚乳酸,系统研究了分子筛对聚合反应的影响,以及不同催化剂对聚合物产率及分子量的影响。采用ＩＲ、ＧＰＣ、＾１ＨＮＭＲ等测试手段时聚乳酸进行了表征,并与丙交酯法所得聚乳酸进行了比较,结果表明,锡（Ｓｎ）是理想的乳酸缩合聚合催化剂,而直接将分子筛加入到聚合反应体系中可有效地提高聚合物分子量。采用γ－Ａｌ２Ｏ３负载的催化剂可以得到分子量较高且分散和     

Vacuum Ultraviolet Free-Electron Laser Photoionization Mass Spectrometry of Alpha-pinene Ozonolysis

\begin{document}$\alpha$\end{document}-pinene is the most abundant monoterpene that represents an important family of volatile organic compounds. Molecular identification of key transient compounds during the \begin{document}$\alpha$\end{document}-pinene ozonolysis has been proven to be a challenging experimental target because of a large number of intermediates and products involved. Here we exploit the recently developed hybrid instruments that integrate aerosol mass spectrometry with a vacuum ultraviolet free-electron laser to study the \begin{document}$\alpha$\end{document}-pinene ozonolysis. The experiments of \begin{document}$\alpha$\end{document}-pinene ozonolysis are performed in an indoor smog chamber, with reactor having a volume of 2 m\begin{document}$^3$\end{document} which is made of fluorinated ethylene propylene film. Distinct mass spectral peaks provide direct experimental signatures of previously unseen compounds produced from the reaction of \begin{document}$\alpha$\end{document}-pinene with O\begin{document}$_3$\end{document}. With the aid of quantum chemical calculations, plausible mechanisms for the formation of these new compounds are proposed. These findings provide crucial information on fundamental understanding of the initial steps of \begin{document}$\alpha$\end{document}-pinene oxidation and the subsequent processes of new particle formation.     

A STUDY OF POLYBUTADIENE SYNTHESIS WITH MoCl_n(OR)_(4-n)-(i-Bu)_2AlOPh AS A CATALYST

The catalytic effect of Mo Cl_n (OR)_(4_n)-(i-Bu)_2AlOPh on the polymerization of butadiene inhydrogenated gasoline is studied (R is alkyl, cycloheptyl, phenyl of C_(4_16)). In this system, the solu-bility and the catalytic activity of the catalyst do not depend on whether the number of carbon atomsin R group is odd or even. The R group with the primary and secondary carbon atom has a fairlygreat influence on the catalytic activity. When R is an alkyl, the catalytic activity increases and therange of Al/Mo values that keeps higher conversion of butadiene is broadened as the size of the Rgroup increases. The content of 1,2-units in the polymer hardly varies with the size of the R group.     

具有色散补偿及增益平衡的光纤链中准孤子传输

用变分法研究非线性薛定谔方程, 讨论了在有色散补偿及增益平衡的光纤链中双曲正割（ｓｅｃｈ）型和高斯型准孤子的传输条件及特性。并给出了最优化设计的判据。根据判据作了数值模拟, 结果说明近似计算对系统设计有现实意义     

Dynamics of Atomic and Molecular Hydrogen Elimination from Hydrocarbons at VUV Excitation

Elimination of atomic hydrogen (H) and molecular hydrogen (H₂) are important elementary chemical processes in photochemistry and combustion chemistry. Recently, unique and sensitive detection techniques for atomic and molecular hydrogen detection were developed in our laboratory. Using the advanced molecular beam methods, we have studied the photodissociation of a few typical hydrocarbons at 157 nm excitation, especially their atomic and molecular hydrogen elimination processes. In this report, we will briefly describe the results from photodissociation of propane, ethylene, propyne and methanol at 157 nm excitation. These molecules represent different classes of hydrocarbons such as alkane, alkene, alkyne and alcohol. Through careful studies on differently deuterated compounds, clear pictures of selective atomic and molecular hydrogen elimination processes can be constructed for all of the above compounds. These results will help us to understand the dissociation dynamics of the small hydrocarbon molecules.