欧拉示性数在确定不动点方面的一些应用

本文根据空间的欧拉示性数是否为零．来确定该空间的自映射是否有不动点的几个方面的应用。     

固定资产计提减值准备的会计处理

本文就固定资产计提值准备的会计处理进行分析,主旨是这项会计政策的正确实施,能充分体现会计的稳健原则,客观地反映企业资产的价值,有利于规范处在蓬勃发展的中国证券市场中的上市公司,加强对会计信息质量的管理。     

4－连通无爪图中的Hamilton圈

Ｍａｔｔｈｅｗｓ等猜想：每一个４－连通无爪图是Ｈ－图．本文证实当Ｇ不含局部连通点及３团时该猜想成立．     

Studies of Several Systems with Air Electrode Electro-Synthesizing H2O2 on the Spot for Degrading Aniline in Aqueous

A gas diffusion electrode (air electrode) with a high current efficiency of electro-synthesizing H2O2 using O2 in air was prepared. The several systems with air electrode as cathode of electro-synthesizing H2O2 on the reaction spot for degrading aniline in aqueous--electro-Fenton system, photo-excitation electro-H2O2 system and photo-electro-Fenton system, were developed. The rates of decomposition of H2O2 and mineralization of aniline were experimentally measured respectively under different conditions, and the results indicated there has an excellent parallel relation between decomposition rate of H2O2 and mineralization rate of aniline. Especially, photo-electro-Fenton system, where H2O2 is decomposed the fastest, is the best system of oxidizing and degrading organic toxicants. Compared photo-electro-Fenton system with photo-Fenton system, important role is revealed in the interface of air electrode. In this paper, the mineralization mechanism of aniline in the photo-electro-Fenton system was also discussed.