环向约束条件下高强混凝土早期开裂

为研究环向约束条件下高强混凝土早期开裂趋势,在单面干燥条件下应用非接触式混凝土收缩变形测定仪测试了水灰比为0.26,0.31和0.40试件的早期自由收缩变形.通过静压试验测试了试件早期弹性模量发展,通过改进环向约束试验观测了环向约束条件下各试件内部的收缩应力及应力梯度.结果表明,水灰比越小,单面干燥条件下受约束高强混凝土早期开裂危险性越高,开裂发生时间越早;开裂时间、开裂时弹性模量在很大程度上决定了早期开裂特点.     

环布碎焦法的实验研究

三维动态热模型实验结果表明，在高炉边缘布加碎焦可使煤气流偏离炉墙，由此起到隔作用，使炉衬侵蚀减缓并由此消除炉墙粘结，故环布碎焦法有利高炉长寿。     

炉顶布料方式对高炉长寿的影响

分析了高炉长寿与炉顶布料的关系，中心加焦可促进中心气流发展，减轻煤气对炉墙的冲刷；环布碎焦可有效隔热且避免矿石粘结墙，使炉墙免侵蚀并消除吉厚，结瘤，采用此二项技术可使高炉长寿，热损失减少故亦有利节能。     

混沌运动的分析及判断

本文总结了混沌运动的特点及判断浑沌运动的几种方法，这些方法是分析混沌运动和其它非线性现象的重要方法。     

非晶FeSiBCu合金系的磁后效

研究了非晶ＦｅＳｉＢＣｕ合金系的磁后效，结果表明淬态Ｆｅ基非晶合金的磁后效主要来自磁致伸缩相互作用，然而还发现磁后效和感生磁各向异性对Ｃｕ含量有类似的依赖关系，这显示还应考虑感生磁各向异性磁后效的影响。     

次酉矩阵及次酉变换

本文在酉空间中引进了次酉矩阵和次酉变换，推广了酉矩阵和酉变换的定义，并得到一些结果，这些结果推广了文[4]中的相应定理。     

Influence of chemical liquids on the fatigue crack growth of the AZ31 magnesium alloy

The fatigue crack growth behavior of an AZ31 magnesium alloy was investigated by comparing the effect of zirconate and phosphate chemical liquids. The morphology, components, and phase compositions of the chemical depositions at the fatigue crack tip were analyzed by employing scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), and X-ray diffraction (XRD), respectively. For samples with and without the chemical liquids, their stress-intensity factor values at the fatigue crack tip were compared by using a stress-strain gauge. The results demonstrated that a zirconate film (Zr_xO_y·Zn_xO_y) and a phosphate film (Zn₃(PO₄)₂·4H₂O and MgZnP₂O₇) could be formed on the fatigue crack-surface at the fatigue crack tip. The stress distribution was changed because of the chemical depositions and the causticity of the chemical liquids. This could decrease the stress-intensity factor value and thus effectively cause fatigue crack closure, which reduces the fatigue crack growth rate. Moreover, it was found that the fatigue crack closure effect of zirconates was more positive than that of phosphates.     

基于模糊聚类算法的精炼过程真空系统故障诊断

针对大型真空冶金系统(DVMS)的故障点多、故障征兆不明显且要求其故障诊断快速、准确的特点,提出了一种基于模糊聚类算法的智能诊断模型·该模型具有很强的自学习、自组织能力适用于大型复杂真空系统的故障诊断·在介绍了模糊聚类算法的理论同时,给出了模糊故障诊断的步骤·以RH KTB真空冶金系统的智能故障诊断为例给出了模糊诊断的实际过程·通过分析证实了该算法对大型复杂真空冶金系统智能故障诊断的有效性·