浇注式沥青混凝土铺装破坏原因

对江阴大桥钢桥面浇注式沥青混凝土铺装使用状况进行了跟踪调查与观察,从铺装材料特性、受力状况、交通组成等方面分析了其破坏的状况及原因.结果表明,铺装材料的高温稳定性与抗疲劳性能不足、超载、重载、慢车速等因素是导致江阴大桥钢桥面铺装破坏的重要原因.     

桥上无缝线路伸缩附加力计算的新方法

用广义变分法来计算桥上无缝线路附加力，提出了研究桥上无缝线路附加力计算的新方法。基于已有的试验及计算结果，先假设钢轨伸缩附加力函数，由此得到钢轨位移及梁轨相对位移函数，再通过对梁轨体系总能量进行广义变分计算，建立起结构体系的平衡方程，最后编制相应的计算程序，得到了符合工程实际的计算结果。     

舒肝丸对大鼠急性肝损伤的保护作用及对胆汁分泌的影响

目的　研究舒肝丸对肝损伤的保护作用 ,以及对胆汁分泌的影响。方法　用四氯化碳致大鼠急性肝损伤 ,以生化指标和病理变化评价舒肝丸的药物作用。以胆总管插管引流法观察药物对胆汁分泌的影响。结果　与模型对照组比较 ,舒肝丸给药组AST、ALT及胆红素指标明显下降 ,白蛋白与球蛋白比值 (A/G)倒置明显改善 ;病理切片显示各给药组与病理模型组比较 ,肝组织损伤明显减轻。舒肝丸给药前后对胆汁分泌量无明显影响。结论　舒肝丸对四氯化碳所致的大鼠急性肝损伤有保护作用 ,而对胆汁分泌无影响     

深水承台上连续刚构桥0号块施工技术方案研究

在全部预应力混凝土连续箱梁施工中,0号块的施工极为关键,其施工质量决定着整个连续梁施工的成败。结合工程实例,介绍了连续刚构桥在承台上架设粗钢管支架及碗扣式满膛脚手架的施工工艺．为其他类似工程提供参考。     

黄河二桥系杆拱桥桥面铺装层最不利荷位的确定

采用目前世界上通用的ANSYS有限元分析软件,对桥面铺装体系进行受力分析.利用移动荷载法确定铺装层间应力的包络面,通过各层间应力发生最大位置处的影响面按规范进行布载,研究了集中荷载作用下铺装层各种最大应力的变化规律,并确定与此对应的最不利荷位.     

五跨连续拱桥落架施工控制分析

利民桥为5跨连续拱桥,以其落架施工为研究背景,采用刚度折减的方法进行有限元模拟分析,并对应力、变形进行监控。通过实测值与理论值的对比分析可以看出,文章采取的落架方案满足设计要求,对同类桥梁的施工具有参考意义。     

道路表面水膜厚度预测模型

针对道路表面的坡面水流受降雨和坡面粗糙程度的影响，是一个高度非线性空间分布的过程，一般模型很难精确描述。建立了基于人工神经网络的道路表面水膜厚度预测模型，以降雨强度、坡度、坡长和坡面的粗糙程度为输入层，水膜厚度为输出层，隐含层为6个神经元，通过试验数据的训练，确定了网络的权重和阈值。应用结果表明该模型预测的水膜厚度与测量值的相关系数为0．98，误差平方和为3．08，这说明该模型用于道路表面水膜厚度预估是可行的。     

人工湿地在污水处理中的研究进展

人工湿地是根据生态学原理产生的一项新型污水处理技术,具有其独到的特点和优势.在重视生态保护的今天越来越受到人们的关注.人工湿地是一项具有发展前景的污水生态处理技术.潜流人工湿地已在世界各国研究应用.本文主要介绍了人工湿地的分类,研究进展、发展趋势以及对人工湿地的展望.     

三门峡水轮发电机空子改造的工艺技术

介绍了三门峡水轮发电机定子改造过程及其施工工艺。     

Experimental investigations on the damping effect due to passengers on flexural vibrations of railway vehicle carbody and basic studies on the mimicry of the effect with simple substitutions

The effect of passengers on a railway vehicle is usually considered as additional mass in designing a carbody. However, previous studies by means of stationary excitation tests or running tests using actual vehicles indicate that passengers behave not as mass but as damping. In this paper, the authors examined the passengers' damping effect under controlled excitation conditions on a roller rig through a series of excitation tests using a commuter-type vehicle. Large and multi-modal reductions of flexural vibrations of the carbody were observed when passengers existed. Influences of the number of passengers, distributions and postures of passengers were investigated. The authors also tried to mimic the damping effect by passengers using flexible tanks filled with fluids. Three kinds of fluids which have different viscosities have been tested. As a result of the excitation tests, good vibration reduction effects were observed by applying those tanks, and it has been found that the flexible tanks filled with fluids bring about vibration reduction effect (including multi-modal reduction) which is equal to or rather better than the case of similar mass of passengers in the carbody; the difference of viscosity gave little affect on the damping abilities. From these measurement results, a possibility of realising effective damping devices against flexural vibrations of railway vehicle carbodies representing passengers damping effect, in a simple, economical and environmental friendly way, has been demonstrated.