闭式－氢硼酸二茂铁甲酰丙酮缩异菸肼稀土配合物

将二茂铁甲酰丙酮与异菸肼缩合，生成金属有机多齿新配体，该配体（ＦＣＲ）与闭式－十二氢十二硼酸稀土化合物反应，得到分子式为［Ｌｎ（ＦｃＲ）２］２（Ｂ１２Ｈ１２）３·ＸＨ２Ｏ（Ｌｎ＝Ｌａ，Ｎｄ，Ｅｕ，Ｇｄ，Ｄｙ，Ｈｏ，Ｅｒ，ＴｍａｎｄＬｕ）的９个配位化合物，经元素分析、红外光谱、紫外光谱对其组成、结构进行了表征，通过ＴＧ－ＤＴＡ研究了它们的热行为．     

Comparative photoemission study of Bi2(Sr,Ca)3Cu2O8+y and Bi1.7Pb0.3Sr2Ca2Cu3O10+y

The electronic structure of Bi-based 2223 single phase superconductor has been studied by ultraviolet and X-ray photoemission. By comparison with that of 2212 phase superconductor, we find a higher density of states nearE _F for 2223 phase. From analysis of the Cu 2p core-level spectroscopy, we obtain a relatively smaller charge transfer energy between copper and oxygen as well as the Coulomb repulsion energy on Cu site for 2223 phase. We relate these changes to the increase of hole concentration from 2212 to 2223 phase. The experimental results support the viewpoint that the transition temperature should be correlated with the density of states atE _F .     

The 2003 International Workshop on Optical Waveguide Theory and Numerical Modelling

Optical and Quantum Electronics -     

On complex structures¶in 8-dimensional vector bundles

Necessary and sufficient conditions for the existence of a complex structure in an 8-dimensional spin vector bundle over a closed connected spin manifold of dimension 8 are given in terms of characteristic classes. The result completes the papers by Heaps [H] and Thomas [T] on the same topic. Received: 2 May 1997     

对甲苯磺酸催化合成乙酸正丁酯

用对甲苯磺酸作冰乙酸和正丁醇的酯化催化剂，成功地合成了乙酸正丁酯，考察了影响反应的因素，探讨并找到了较好的反应条件：乙酸l00mmol，n(冰乙酸)：n(正丁醇)：n(催化剂)=1：3：0．006，反应时间1．5h，不另加带水剂，产率达99．14％。     

α－烯丙基甘油醚的合成新方法

在路易斯酸催化下，烯丙醇和环氧氯丙烷经加成、环化和水解后得到标题化合物，该法比文献报道的甘油－氯丙烯法产率提高约１０％。     

Weak Factorization Systems and Topological Functors

Weak factorization systems, important in homotopy theory, are related to injective objects in comma-categories. Our main result is that full functors and topological functors form a weak factorization system in the category of small categories, and that this is not cofibrantly generated. We also present a weak factorization system on the category of posets which is not cofibrantly generated. No such weak factorization systems were known until recently. This answers an open problem posed by M. Hovey.     

胃癌危险因素病例对照研究

报告了在南昌市进行的一项胃癌危险因素的病例对照研究，共调查胃癌病人39例和对照134例，经单因素分析，发现主要危险因素为吸烟，饮烈性酒，进食快，食辛辣食物，腌菜，精神受刺激，好生闷气，胃溃疡史等，而进食规律。多吃水果则具保护作用，同时对病例和对照做了血清微量元素测定，表明胃癌患者血清中Mo、Se和Zn缺乏与胃癌的发生有关。