高频接近开关检测原理与设计

研究了电感式接近开关工作电路的原理,其电路可分为振荡电路、检波电路和输出电路三部分,对这三部分电路分别进行了研究以及详细说明。     

基于PLC的发酵罐温度控制系统

针对发酵罐的温度控制特点,采用西门子PLC 226设计了发酵罐温度控制系统。由于进水阀采用双位阀,为了便于PLC 226实现,设计了一种基于模糊PID思想的智能控制器。该控制器按照模糊PID思想,但实现过程与模糊PID完全不同。本系统已在山西卫氏鱼康实业有限公司投入使用,经实际运行该控制系统能完全满足发酵罐的温度要求。     

煤块回水过程传质特性的实验研究

本文对干燥煤块的回水现象进行了实验研究。验证了回水过程具有三个特征阶段，并分析了环境因素，煤块粒径，初始含水率及干燥方式等因素对回水过程的影响。     

Effect of design of a sex-pheromone-baited delta trap on behavior and catch of maleEpiphyas postvittana (Walker)

Through field trials and wind-tunnel studies, we have demonstrated that certain structural features of a sex-pheromone-baited delta trap affect catch of light-brown apple moth,Epiphyas postvittana, males, by influencing behaviors used to enter and exit the trap. Field catch of males was dependent upon length (and width) of the trap, with increases in length yielding linear increases in catch. In the wind tunnel, similar numbers of males entered the two traps, but significantly fewer males exited the longer trap within 1 min after entering it. Although males landed on the sticky surface at similar distances from the downwind entrances of the traps, they were stuck farther upwind on the longer trap. Thus, it is probable that the increase in field catch with increase in trap length relates to the increase in distance (and hence time) that males walk on the sticky surface, towards the pheromone source, before attempting to exit. The bottom barriers (as well as additional barriers at the top and sides) at the entrances of the trap also significantly influenced trap catch. The barriers apparently influence trap catch in two ways. Firstly, they hinder the exit of males from the trap, thus diverting males back into the trap and increasing their chance of being caught. Secondly, they influence where the male lands on the sticky surface; with higher barriers, males land farther upwind (i.e., nearer the source), and thus farther from an exit. Finally, as the source was suspended higher above a horizontal surface, greater numbers of males landed on the source. This result shows that the position where a maleE. postvittana lands is influenced by the relationship of the source to the surface and suggests that trap catch of males may similarly be influenced (i.e., by inducing males to land farther from the exits).     

玻璃中离子注入的进展

玻璃中离子注入的进展王承遇，王波，陶瑛（大连轻工业学院玻璃及无机新材料研究所１１６００１）ＴｈｅＤｅｖｅｌｏｐｍｅｎｔｏｆＩｏｎ－ＩｍｐｌａｎｔｉｏｎｉｎＧ１ａｓｓｅｓ￥ＷａｎｇＣｈｅｎｇｙｕ；ＷａｎｇＢｏ；ＴａｏＹｉｎｇ（ＩｎｓｔｉｔｕｔｅｏｆＧｌ...     

搅拌槽中固液悬浮及其放大的研究

研究了具有盘管、碟形底和斜叶涡轮固液悬浮搅拌槽的放大规律。试验用槽径（外径）分别为０．２ｍ、０．５ｍ和１．０ｍ的三个有机玻璃搅拌槽。用激光法测定悬浮液浓度。得出离底悬浮及均匀悬浮时搅拌转速和比功率的经验关联式，与测定槽内轴向速度分布所导出的均匀悬浮方程相吻合，并表明槽径的放大指数主要由循环流数所决定。     

煅烧煤矸石的火山灰活性

经ＸＲＤ证实永城煤矸石是砂质泥岩。其主要粘土矿物是高岭石，但加热相变有别于纯净的高岭石。当煅烧温度９００℃，活性来自偏高岭石的生成。当煅烧温度约１１００℃，生成相当数量的莫来石的同时存在较多的玻璃体，以致也具有良好的活性。     

近临界区流体相态和热力学性质研究现状及发展趋势

近临界区流体相态和热力学性质的研究是当前化学工程领域受到重视的前沿研究课题。本文扼要介绍了临界现象与临界指数，描述了近临界区流体相态和热力学性质的实验测定与估算方法，并对该领域的研究动态作了讨论。     

利用催化裂化干气制乙苯经济效益的探讨

预测了国内外乙苯需求情况，简单介绍了国外乙苯生产技术状况，着重分析了国内利用炼厂催化裂化干气中所含稀乙烯制乙苯技术的经济效益。