Fracture of Aramid Fiber/Epoxy Resin Micro Composites

Kevlar-49 fiber was modified through cold air plasma treatment and plasma grafting with acrylic monomers. Fracture of aramid fiber/epoxy resin micro composites has been studied by means of single fiber pull-out test. Tow types of pull-out curves are correlated with the different failure modes. A polyacrylic acid-co-ethyl acrylate graft layer can improve the adhesion and protect the fiber from damage caused by interfacial stresses.     

Local Enrichment of Active Element Y in Y-modified PVD Films on Mild Steel Substrate

By means of EPMA,SIMS and XTEM tech-niques,the element distribution at the transitionzone of Y-modified ion plated titanium andtitanium nitride film on A3 steel substrate and thevariation of the element content on the surface ofthe evaporation source before and after service werestudied in detail.A mode was proposed in terms ofpreferential evaporation and micro-tunnel trans-portation of Y at the interface of film/substrate.     

丁烷脱沥青装置掺炼油浆工艺

由于新疆原油的渣油中重金属含量高，结构组成复杂，直接进入催化裂化装置做原料时，催化剂重金属污染严重，产品分布差，渣油掺炼量低。而且，丁烷脱沥青过程所得到的脱油沥青软化点高、针入度低、延伸度差。为了提供优质的催化裂化原料和优质的道路沥青原料，进行了丁烷脱沥青装置掺炼油浆组合工艺的开发和应用，取得了较好的效果，脱沥青油收率提高，提供了更多重金属含量低的催化裂化原料，沥青性能得到改善。     

中国先进研究堆堵流事故分析

堵流事故是板状燃料研究堆发生概率相对较高的一种事故。本文进行CARR堵流事故分析时,假定额定功率运行下,1盒燃料组件的入口全部堵塞。用Relap5\Scdapsim\Mod3．2程序分析堵流事故时反应性、堆功率、压力、流量和温度等的变化,并分析发生堵流的标准燃料组件对周边燃料组件的影响。结果表明,发生堵流的燃料组件将烧毁,但不向相邻的组件扩展。CARR设计采取的安全措施可以把堵流事故后果控制在可接受范围之内。     

井下减速器传动方案分析

结合井下减速器的结构特点，分析了定轴轮系传动、2K-H型行星轮系传动、3K行星轮系传动、少齿差行星轮系传动4种传动方案，选择内齿作为输出轴的少齿差行星轮系传动方案更符合涡轮钻具的传动要求和井下工具结构特点。少齿差行星轮系的研制、开发、应用可降低涡轮钻具转速，提高扭矩，提高深井钻速。     

催化裂化装置中大型波纹管膨胀节失效分析

对某石化公司催化裂化装置中泄漏的大型波纹管膨胀节进行了失效分析.结果表明,应力腐蚀是该膨胀节失效的主要原因,而局部的点蚀和残余应力、工作应力是应力腐蚀的必要条件.     

现代工业产品的造型设计

在寻求人-产品-环境的和谐统一与协调中,把工程技术与艺术、科学与美学、实用与美观等诸方面有机统一于现代工业产品造型设计中,使产品更具有市场竞争力.     

龙开口水电站溢流坝段动力模型破坏试验研究

采用仿真混凝土材料研究了龙开口水电站溢流坝段在不同因素影响下的动力破坏特征,并通过对6个模型试验结果的分析探讨了溢流坝段的动力破坏机理。试验中考虑了坝体-库水的动力相互作用以及横河向地震动对大坝破坏的影响,采用规范谱波和场地谱波两种地震动激励进行模型超载破坏分析。试验结果为工程设计和评价溢流坝段的抗震性能提供依据。     

地震钻机调速系统

介绍自行设计的针对WT－50W型液压式地震钻机的调速系统，较为全面地提供该系统的控制电路原理和执行机构、解脱装置、操纵机构的方案。     

Evaluation of Morphology—Stable Critical Size of KNbO3 Crystals

Skeletal form of KnbO3 crystals growing in Li2B4O7 solvent was in-situ observed at 900℃ and it was found that shallow depression started to develop on the surface of KnbO3 crystals when the crystal size exceeded several micron,typically 7 micron.Based on the quantitative criterion derived by Chernov,the estimated critical size of KNbO3 crystals was 1 micron,which was consistent with the experimental measurement.The kinetic coefficients,Kcorner and Kcr,in the criterion were experimentally obtained in the diffusive-convective and diffusive-advective flow states respectively.