按物质的燃烧特性,危险物品分为哪几类?

<正>主持人:我们企业是从事半导体集成电路生产的企业,在生产过程中,需要使用各种危险物品,请问:按物质的燃烧特性,危险物品分为哪几类?深圳任济民任济民先生:按燃烧特性,凡有火灾或爆炸危险的物品统称为危险品。可分为以下7类:1.爆炸物品。凡是受到高热、摩擦、冲击等外力作用或受其他因     

Effects of CdCl2 thermal annealing on CdZnTe thin films deposited by close-spaced sublimation

采用近空间升华法制备了CdZnTe薄膜,并对其进行CdCl2退火,采用扫描电镜（SEM）、能谱仪（EDS）、X射线衍射仪（XRD）、紫外光谱仪、I-V测试仪等研究了退火对薄膜表面形貌、成分、结构以及光电性能的影响。结果表明,经过CdCl2退火后薄膜的晶粒尺寸明显增大,晶粒分布更加均匀;XRD分析结果显示,退火后薄膜的最强峰（111）峰的半峰宽变窄,薄膜沿（111）方向的择优取向明显增强;退火后薄膜的光学透过率降低,截止边红移,光学禁带宽度减小;薄膜的电阻率在退火后下降了两个数量级。     

环境中有机污染物的半导体光催化降解研究进展

应用半导体二氧化钛光催化剂促进氧化降解环境中常见有机污染物是一种有效的清洁处理技术,对光催化活性的半导体的必要性质,影响光催化效率的内在因素以及反应器,反应条件等方面的因素进行了讨论。     

黑暗中的“守望者”

激光摄像机正处在高速发展期,每年增长都在50%以上,经过十多年的发展,各个细分市场都有相应的产品。但就目前来说,激光市场规范性还是比较差的,比如有些厂家推出价格为一两千元的激光摄像机,只是打着激光的旗号,却根本达不到预想的夜视效果,甚至还不如红外LED摄像机。     

分布式光纤气体监测技术在气相连通储罐的应用

针对常规氧含量检测仪工作寿命短,检测精度低,不能安装在储罐内部,造成无法对气相连通储罐内的氧含量实时监测等问题,基于可调谐半导体激光吸收光谱技术,设计开发了一种高灵敏度、现场无源、高可靠性的激光光纤氧气在线监测系统.经过实验室测试和现场应用,该系统稳定可靠,可实现对储罐及连通管道中氧含量的准确在线监测,有效降低群罐火灾风险,具有良好的推广和应用前景.     

一种香兰素的制备方法

该发明公开了一种香兰素的制备方法。其方法：将制浆废液中的木质素磺化得到的木质素磺酸盐溶于水，然后将得到的溶液置于光化学反应器中，在半导体光催化剂（其加入量为上述水溶液质量的0．5％～1％。）的作用下，通入空气或氧气，用紫外灯在常温至80℃的温度下辐照进行光催化氧化降解，分离后得到香兰素产品。     

半导体激光测尘技术在电厂的应用

对引进美国的ＣＥＭ系统中的激光测尘仪的工作原理、安装调试、系统校准、对比标定、误差分析及运行纵作了全面的介绍，认为激光测尘技术是一项有前途的检测手段。     

Removal of formaldehyde over MnxCe1-xO2 catalysts: Thermal catalytic oxidation versus ozone catalytic oxidation

MnxCe1- xO2（x： 0.3–0.9） prepared by Pechini method was used as a catalyst for the thermal catalytic oxidation of formaldehyde（HCHO）. At x = 0.3 and 0.5, most of the manganese was incorporated in the fluorite structure of Ce O2 to form a solid solution. The catalytic activity was best at x = 0.5, at which the temperature of 100% removal rate is the lowest（270°C）. The temperature for 100% removal of HCHO oxidation is reduced by approximately 40°C by loading 5 wt.% Cu Oxinto Mn0.5Ce0.5O2. With ozone catalytic oxidation, HCHO（61 ppm） in gas stream was completely oxidized by adding 506 ppm O3 over Mn0.5Ce0.5O2 catalyst with a GHSV（gas hourly space velocity） of 10,000 hr-1at 25°C. The effect of the molar ratio of O3 to HCHO was also investigated. As O3/HCHO ratio was increased from 3 to 8, the removal efficiency of HCHO was increased from 83.3% to 100%. With O3/HCHO ratio of 8, the mineralization efficiency of HCHO to CO2 was 86.1%. At 25°C, the p-type oxide semiconductor（Mn0.5Ce0.5O2） exhibited an excellent ozone decomposition efficiency of 99.2%,which significantly exceeded that of n-type oxide semiconductors such as Ti O2, which had a low ozone decomposition efficiency（9.81%）. At a GHSV of 10,000 hr-1, [O3]/[HCHO] = 3 and temperature of 25°C, a high HCHO removal efficiency（≥ 81.2%） was maintained throughout the durability test of 80 hr, indicating the long-term stability of the catalyst for HCHO removal.