乙苯/蒸汽过热器失效原类分析及改进措施

剖析了苯乙烯装置原进口乙苯／蒸汽过热器的失效原因，并提出了解决问题的技术措施，即通过合理选票避免了材质的高温回火脆化；改进滑动管板结构，使滑动管板易于滑动。工业应用证明采取的改进措施获得成功。     

冲击减振器性能的试验研究

本文叙述了用模拟试验装置对冲击减振器性能所进行的试验研究.试验研究揭示了冲击减振器的运动特性;找出了影响冲击减振器减振效果的有关参数及其影响规律,它对工程应用很有参考价值.     

大型电控柜粉末喷涂设备设计

介绍了静电喷粉室的结构、固化烘箱的设计参数及其结构设计中几个关键问题。     

试论工矿电机车的机械设计及应用

从现用工矿电机车机械设计及应用中存在的问题,对车架、轮对、弹簧托架、传动装置的设计方面进行了探讨。     

滑坡推力计算中抗剪强度标C，Φ的确定

目前确定滑坡抗剪强度指标C ,值的方法主要有试验手段、经验数据对比、极限平衡状态下的反算法。试验法因受各种条件限制 ,其结果常难令人满意 ,而经验数据对比法过多的强调经验 ,实际上却很难把握 ,因此 ,反算法成为岩土工程界常用的一种方法。文章重点探讨了反算法的基本原理、反算法的具体步骤、反算法建立联立方程的条件 ,最后介绍了对滑坡多个轴向断面的反算力学指标进行加权平均分配k值的方法。本文对滑坡推力计算中抗剪强度指标C ,的确定具有一定的参考作用     

衍射光学束匀滑器件性能的空间频谱分析

采用空间频谱方法分析了衍射光学束匀滑器件的焦面光强分布 ,重新定义了光能利用率及顶部不均匀性两个参数 ,由于其定义的溯源性 ,能够真实准确地评价束匀滑器件的设计性能。最后 ,采用这两个参数对精细化设计前后的衍射光学束匀滑器件性能进行了对比 ,结果证明了精细化设计的有效性     

The role of hydrogen in stress-corrosion cracking of austenitic stainless steel in hot MgCl2 solution

The role of hydrogen in stress-corrosion cracking (SCC) of austenitic stainless steel was investigated in boiling chloride solution. The tests in the mixed melted salt verified that hydrogen-induced cracking (HIC) could occur at 160 °C if sufficient hydrogen could be supplied continuously. It was found that the threshold SCC intensity factors of both 321 and 310 steels were lower than those of HIC during dynamic charging at high fugacity at 40 °C and 160 °C. In addition, anodic polarization decreased hydrogen concentration and promoted SCC in hot LiCl solution, while cathodic polarization increased hydrogen concentration and restrained SCC. Hydrogen could be introduced into the specimen and be concentrated at the crack tip during SCC. It could promote anodic dissolution and SCC remarkably, although it was not enough to produce cracking.     

Effect of isotacticity distribution on crystallization kinetics of polypropylene

The crystallization kinetics of isotactic polypropylene (iPP) depends not only on the undercooling but also on its microstructure characteristics. In this paper the effect of isotacticity distribution on the isothermal kinetics of iPPs in the crystallization regime III was examined by differential scanning calorimetry. The microstructure features of two commercial film grade iPPs were characterized with temperature rising elution fractionation and size exclusion chromatography. The results indicated that, although the overall isotacticities and molecular weights of two iPPs were similar, their isothermal crystallization kinetics displayed marked differences due to the disparity in isotacticity distributions. With increasing molecular weight of components containing crystallizable units, the isothermal crystallization rate exhibited a higher temperature dependence. When the isotactic defects in polypropylene chains increase with the molecular weight of components, both the fold surface free energy σ_e and the work of chain folding q decreases, in spite of the higher molecular weight. © 2002 Society of Chemical Industry     

结合图像灰度信息和空间信息的有意义区域分割

本文提出了一种应用图像灰度信息和空间信息的分割方法.首先利用快速的优化分水岭算法将图像分成多个小区域;其次,计算每一个小区域的特性参数,并确定各个区域之间的拓扑关系;最后用模糊C-均值聚类算法根据区域的灰度特性及空间特性进行归类,获取最终的分割结果.结果显示,该方法与阈值化模糊C-均值聚类算法相比,分割结果更加有意义,而且速度也有极大地提高.     

腈纶工艺全流程DCS仿真培训系统

本文介绍了年产５万吨腈纶的全流程仿真培训系统。该仿真系统的硬件采用９台微机通过ＴＣＰ／ＩＰ网络联结而成，模拟化工过程特性和ＴＤＣ３０００散控制系统。