试用安全系统工程(ETA)图——分析锅炉事故

本文以某县火电厂一台AZD20—25/400型锅炉缺水干烧至熔的重大事故为例,试用安全系统工程(ETA)图树形分析法对事故发生的原因进行分析以查明事故原因,分清事故责任,拟定改进措施,并应用“人—机—环境”安全系统工程管理方法,就如何搞好锅炉的安全管理,防止事故重复发生,发表我们初浅的认识,其目的是对锅炉的使用管理作一点有益的工作。     

Infrared study of EPOXS-TEOS-TPOT gels

The thermal changes in the structure of EPOXS-TEOS-TPOT (where EPOXS = epoxysilane, 3-glycidyloxypropyltrimethoxysilane, TEOS = tetraethylorthosilicate, and TPOT = tetraisopropylorthotitanate) derived sol-gel coating materials were followed by infrared spectroscopy. The study showed that for the low-temperature treated gels, the Si-O-Si network was very open, with many organic side groups connecting to it. One of the prominent characteristics of the structure was the presence of four-fold siloxane rings. TiO₂ plays a part in the formation of the network by Ti-O-Si bonding. With increasing the TiO₂ content in the system, the tendency towards the formation of the four-fold siloxane ring decreased. With increasing heat-treatment temperature, the organic side groups gradually disappeared and, at the same time, the siloxane ring structure decomposed and a more rigid and condensed Si-O-Si network was gradually established.     

附网存储设备的安全机制

研究了附网存储的安全机制 ,阐述了一种用于附网存储设备的加密权能系统。     

陶瓷烧成中SOx的排放及降低SOx的方法

本文分析了陶瓷烧成过程中S0x的主要来源以及降低SOx排放的方法。同时，还简要介绍了目前主要的几种SOx排放处理方法．并对减少我国陶瓷窑炉燃烧带来的污染提出几点建议。     

一种新型防腐体系的效能研究

化妆品防腐剂正越来越被大家所关注.欧盟和美国已经开始重新评估现有防腐剂的安全性.与此同时,更多的化妆品生产商希望走向全球市场.但是公众关于传统化妆品用防腐剂的争论限制了配方师在配方设计时的选择.大家开始把目光投向新的防腐替代产品.一种新的防腐概念,Euxyl PE(R) 9010满足了市场的需求.此文通过微生物实验证明了Euxyl PE(R) 9010的防腐效果.     

Transport anomalies and magnetic properties of Sn x Eu1.2−x Mo6S8 alloys

We have measured the resistance R, magnetoresistance, and magnetization of sintered samples of the compounds Sn _x Eu_1.2–x Mo₆S₈, where x = 0, 0.12, 0.24, and 0.48. A large resistance anomaly beginning at T ~ 100 K and extending to low temperatures is found in all of the alloys except x = 0.48, which had a high superconducting transition temperature T _c ~ 11.3 K. The resistance anomaly, which appears to be correlated with the depression of T _c, is also correlated with a large negative magnetoresistance at temperatures T 12 K. For all samples except x = 0.48, that part of the magnetoresistance attributed to spin-flip scattering is proportional to the square of the magnetization M ² and is 30–40% of R (0) for some samples. Magnetization measurements are consistent with a spin-7/2 paramagnetic behavior of Eu²⁺ ions when allowance is made for a concentration of 20–30% nonmagnetic (J = 0) Eu³⁺ ions as determined from Mössbauer measurements. The experimental results are inconsistent with predictions of dilute magnetic alloy Kondo models. We speculate that the resistance anomaly and suppression of T _c for x 0.24 are associated with a semiconductor-like behavior.Work performed under the auspices of the U.S. DOE.Work supported by NSF Research Grant DMR 78-2428.     

耐温保气型热熔胶的研制

本文以二聚脂肪酸聚酸股为主基村，研制了一种通信电缆接头用热可缩材料用热熔胶。讨论了主基材的选择、辅料对胶性能的影响，且与EVA型常规胶性能作了比较．     

在超细催化剂CuO/ZnO/SiO_2上CO_2加氢合成甲醇的优化研究

本文考察了焙烧温度、还原温度、反应温度、反应压力和体积空速对用于ＣＯ２加氢反应的超细ＣｕＯ／ＺｎＯ／ＳｉＯ２催化剂性能和产物分布的影响，确定了催化剂的合适焙烧温度、还原温度，并对ＣＯ２加氢反应条件进行了优化     

车用汽油辛烷值浅论

本文简要地介绍了汽油辛烷值的基本概念以及辛烷值测量的意义。     

悬臂式管桩在基坑支护工程中的应用研究

基于土拱效应及土体M-C屈服准则,建立了桩间土拱计算模型,并得到了悬臂段桩身土反力计算公式;考虑桩身挤土效应及深度效应,利用Vesic圆孔扩张理论,推导出挤土管桩水平承载力与水平位移之间的关系式;在此基础上,利用力和弯矩平衡条件,建立了悬臂式管桩支护结构设计方法.为了验证理论公式的可行性,将计算结果、现场实测结果及朗肯土压力计算结果进行对比分析,结果表明本文计算结果与实测结果桩侧土反力相差较小,且变化趋势基本一致,并且其计算精度相对经典土压力理论得到较大的提高,验证了理论方法的可行性.