织物-树脂复合材料层压板的准静态侵彻机理

本文利用MTS得到了芳纶和高强维纶织物复合材料层压板受尖头侵彻体穿孔的准静态侵彻曲线 ,比较和分析了不同类型纤维集合体与热固性树脂和热塑性树脂复合材料的破坏模式 ,并考察了芳纶织物复合材料层压板侵彻的逐步破坏过程 ,揭示了复合材料层压板的准静态侵彻机理。     

Preparation of nanosized titania powder via the controlled hydrolysis of titanium alkoxide

By controlling the hydrolysis of titanium butoxide, followed with or without an ethanol washing process, the preparation of nanoscale titania powder was studied in detail. The characteristics of different powders produced by the direct precipitation (without an ethanol wash) and ethanol wash processes were studied by X-ray diffraction, transmission electron microscopy, BET, thermogravimetry and differential thermal analysis techniques. By comparison, it was found that both the direct precipitation and ethanol wash methods can obtain slightly agglomerated nanoscale titania powders of less than 15 nm, but the ethanol wash can further reduce the agglomeration. The particle sizes of titania powders can be modified while still retaining the anatase structure.     

Effect of processing history on the properties of Ag-based tapes

The Bi-system tapes and coils were prepared by the powder-in-tube method. The effect of processing and heat treatment on the properties of the tapes and coils was studied. It is found that the shearing stress produced by the rolling process may destroy the 2223 phase, and the destroyed 2223 phase cannot be recovered by heat treatment, whereas the pressing stress produced by the uniaxial pressing process only makes the 2223 phase grains break, and the broken 2223 phase can be closed by the heat treatment. TheJ _c values of the rolling samples, pressing sample, and the coil with a diameter of 35 mm are over 1.3×10⁴, 2.5×10⁴, and 4×10³ A/cm² (77 K, 0 T), respectively.     

造纸机集散控制系统

本文介绍了造纸机集散控制系统．讨论了其硬件的组成和软件结构．研究了ＤＤＳ过程级控制器的功能及对造纸机各分部速度的优化控制．系统投人运行后，取得较好的经济效益．     

一种制备插层和无定形高岭土的新方法

利用甲醇钠强烈的夺氢作用 ,介绍了一种制备插层和无定形高岭土的方法。利用XRD为主要检测手段研究了甲醇钠的质量分数、反应温度等因素对反应的影响。结果表明 :在反应温度较低、质量分数较低的甲醇钠溶液中 ,高岭土容易被插层而膨胀 ,反之高岭土的层状结构被破坏而无定形化。红外光谱分析进一步证明了插层和无定形高岭土结构的变化     

同心筒发射中旁泄流影响的数值研究

同心筒是一种先进的新型的舰载导弹垂直发射装置。文中采用动网格技术模拟了导弹在同心式发射筒内发射的瞬态过程。探讨了发射过程中旁泄流的产生与消失原因。通过设计内外筒的合理大小可以有效减弱旁泄流的影响。通过大量的数值实验,给出了避免外筒发生雍塞的代数关系式。     

浅谈赣抚大堤樟防1标射水造墙的接缝技术和处理措施

介绍射水造墙的接缝原理，并把自己在施工过程中为确保接缝质量达到设计要求而总结出一些经验和处理措施提出为一起探讨。     

单片机在监控同步电动机运行功率因数中的应用

介绍如何利用单片机自动控制同步电动机运行时的功率因数。     

电脱盐工艺技术改造运行总结

中国石化股份有限公司济南分公司南常减压装置 2 0 0 1年防腐改造中首次采用了国产高速电脱盐设备 ,对电脱盐工艺进行了改造 ,通过近 1年的生产运行 ,不断进行摸索调整 ,适应了加工多品种原油的需要 ,取得了较好的脱盐效果 ,脱后原油含盐降到 0 .62mg/L ,脱盐污水油含量降至 5 0 μg/g ,为后续加工装置降低能耗、减轻设备腐蚀、安全平稳生产创造了条件