三氯乙醛水溶液的半导体光催化降解研究

本文以人工光源（高压汞灯和汞氙灯）和太阳光为光源，分别对三氯乙醛水溶液和氯油车间含氯有机废水的半导体光催化降解进行了研究。结果表明，在人工光源照射下，０．４％（质量）的ＴｉＯ２或ＴｉＯ２／ＷＯ３能促使三氯乙醛降解；在太阳光照射下，以上催化剂又能加速含氯有机废水的光降解。     

Characterization of particle size distribution of mainstream cigarette smoke generated by smoking machine with an electrical low pressure impactor

Cigarette smoking is a particle-related exposure. Studying the characteristics of the particle size distribution of cigarette smoke can aid in providing knowledge of smoke aerosol attributes. We used an electrical low pressure impactor （ELPI） to measure the particle size distribution of mainstream cigarette smoke generated by a smoking machine and provided a continuum of particle sizes of cigarette smoke from a whole cigarette. The results showed that the aerodynamic diameters （D, geometric mean of a channel） of particles ranged from 0.021 to 1.956 ~m, and the number concentrations were on the order of 105-109 cm-3 for different sizes of particles. The particle number of the size category below 0.1 p,m approximated that of the category 0.1-2.0 Ixm, and the particles in the size category of 0.1-2.0 μm contributed extremely heavily to total particulate mass. In addition, the results with small samples indicated that the tar yields normalized per milligram of nicotine showed an approximately linear increase with increasing concentration of total particles.     

飞机货舱烟雾探测系统优化布置技术及平台研发

对飞机货舱烟雾探测系统布置原则进行了论述,提出了一套飞机货舱烟雾探测系统布置方法,并开发出一套烟雾探测系统布置优化平台。对烟雾探测系统布置中的几个关键技术问题进行了详细讨论,并以某型运输机货舱为实例进行了仿真计算。