First steps towards a scientific approach to the Processing of Filled Polymers (Propellants)

This research is directed towards a better understanding of filled polymer processing in general, and energetic composite solid propellants, in particular. The program established is composed of four stages and isolates batch processing as the technique to be examined. The first stage in the program is a thorough compilation of literally thousands of batch data for meaningful correlation and insight as to important areas within the process. Second is developing the fundamental equations governing the material for highly filled rheological suspensions and solving them numerically (biomodal particle distributions solely are to be considered). Third is the formulation of “model” compounds for experimental verification (this includes the use of perfectly spherical solid particles). Fourth and final is the implementation of this previous work to propellant manufacture. It is desired that from this work, new more economical means of predicting and also enhancing propellant performance can be developed. This paper presents the results of the completion of the first step within this program. A brief discussion of the latter steps is mentioned with respect to their progress. The results to be presented were funded from the College of Enginneering and Mines at the University of Arizona.     

供水管道带压补焊

供水管道在安装试运或日常使用过程中经常发生泄漏现象,为了不影响正常的生产和生活用水,可采用带压补焊进行处理.下面介绍几种切实可行的带压补焊方法及注意事项.     

石油储运与雷击灾害

分析了雷电的形成与危害,并提出石油储运系统的防雷措施。     

电动机绕组匝间故障的原因及处理

电动机绕组匝间故障形成的主要原因为绕组本身的线材质量不高、工艺性缺陷和各种过电压冲击损伤等。介绍匝间故障的诊断和处理方法,针对低压散嵌绕组和高压成型绕组匝间故障的处理实例提出了增强匝间绝缘的方法。     

HQ70高强度焊接结构钢强韧化研究

为适应新形势的需要，我国确定在鞍钢现有的生产条件下，研制开发ＨＱ７０钢。开展了ＨＱ７０钢的热处理制度，显微组织及机械性能三者之间关系的系统研究，找出了合理的生产工艺制度，以便指导ＨＱ７０钢生产。     

过断层特大断面厚煤顶煤巷破坏机理及围岩控制技术

为了研究过断层特大断面厚煤顶煤巷围岩破坏失稳机理及其控制技术,以山西省东坡煤矿9#煤层923材料巷在相邻工作面回采过程中发生严重变形破坏为工程背景,采用UDEC离散元数值分析的手段,模拟了923材料巷受相邻工作面采动影响下破坏的过程。揭示巷道围岩破坏机理,提出采用"桁架锚索+锚网带"的围岩控制技术,实现了有效控制顶板冒落和围岩剧烈变形。     

减小永磁电动机噪声的初步探讨

简要地介绍永磁电动机噪声产生的原因,在设计时采取的措施以及应用的效果.     

陶瓷工业废水治理与综合利用

本介绍了采用平流沉淀池和絮凝剂处理陶瓷工业废水的情况,既解决了排放悬浮物的污染问题,又使处理后的水及废原料得到综合利用。     

高铬镍合金钢管的焊接工艺

从理论上分析了化工生产装置上使用瑞典产的高铬镍合金钢管(904L)的耐蚀性,904L合金钢完全具备较高的耐晶间腐蚀、点蚀和耐应力腐蚀断裂能力。介绍了其焊接环境要求、坡口形式以及工艺规范,焊接的工艺措施及焊后检查。该焊接操作工艺对高铬镍合金钢管焊接生产有指导意义。     

中央空调制冷机的化学清洗

阐述了中央空调制冷机结垢的类型及其产生的原因和危害，分析了中央空调制冷机的冷媒水系统、冷却水系统的化学清洗技术和操作方法。