上跨某通车高速公路现浇箱梁施工交通导改技术

随着我国经济的快速发展,立体交叉桥梁设计越来越广泛,为了既不影响已通车道路车辆的通行,又能顺利完成新建立体交叉桥梁施工,交通导改方案非常必要。详细阐述了两层立体交叉的新建现浇箱梁桥跨越已通车高速的施工安全交通导改方案。     

GP-4000型水泥滑模摊铺机的IDBI系统改造

基于在梅州西环和天汕十二标两个标段的水泥混凝土路面施工中，发现自动下插传力杆的部分路面出现平整度差及麻面、表面塑性收缩裂缝等质量问题，介绍了美国GOMACO公司的GP-4000型水泥滑模摊铺机的工作原理，并对其IDBI系统进行改造。通过将该机应用于实际施工中，取得了良好的技术、经济效果。     

手持式智能船舶吃水及载重测量仪研制

针对船舶吃水难以精确测量问题,研制手持式智能船舶吃水及载重测量仪,利用激光测距方法,采用多点测量措施来消除波浪和浮态产生的纵横倾斜对船舶吃水测量的影响,能够较为精确地测量船舶吃水,从而计算出船舶的载重量。     

Finite Element Method Analysis of Stress Field Considering Thermal Coupled Force During Laser Process

IntroductionLaserphasetransformationhardeningisanewtechnologyduringwhichlaserheatresourceactsdirectlyonsurfaceofmaterialandcompositionscharacteristicofmaterialischanged.Thetechnologyproce8sesacharacterofrapidheatvelocity,highheattempelatureandquickcoolingspeed(l0'col0'aC/s).Thecompositionandcharacteristicofmaterialvariedwithvariousinnertemperaturewillleadtothermalresidualstress.Itiswellknownthattheresidualstressaffectssignificantlyoncharacteristicofmaterial,suchasimProvingstrengthoffatigUere…     

路用多孔页岩陶粒表面修饰优化

为提高路用多孔页岩陶粒的路用性能并提升其阻热性能，优选3种有机处理剂，借助吸水率、筒压强度、控制筛孔通过率及磨耗值试验，确定了不同处理剂最佳修饰工艺；基于吸油率、表面孔隙封堵率与SEM试验，系统研究了修饰前后页岩陶粒表面孔隙封堵情况，对比评价了不同处理剂对页岩陶粒路用性能的影响规律，确定了页岩陶粒最佳处理剂；并在此基础上，全面评价了表面修饰对页岩陶粒混合料路用性能的影响。结果表明：苯基硅树脂的适宜浓度为25%，固化温度为160℃，硅丙乳液的适宜浓度为35%，成膜温度为30℃，助剂含量为3%，建筑防水剂修饰页岩陶粒的适宜浓度为35%，固化温度为85℃；其中苯基硅树脂对页岩陶粒表面封装效果最好，24 h吸油率最低，表面孔隙封堵率高达78%，且SEM图像也表明经表面修饰的页岩陶粒表面开口孔隙数量明显减少；3种处理剂均能不同程度地提高路用多孔页岩陶粒的路用性能，24 h吸水率的降幅在80.48%~94.5%之间，压碎值降幅在4.62%~17.52%之间，磨耗值降幅在5.33%~30.92%之间，黏附性等级提高0.5~2级；苯基硅树脂对页岩陶粒吸水率与黏附性等级改善效果最佳，硅丙乳液对压碎值与磨耗值改善效果最为明显，综合考虑所有评价指标，确定了页岩陶粒最佳处理剂为苯基硅树脂；且经苯基硅树脂表面修饰后的页岩陶粒混合料各项路用性能均有不同程度提高。     

SS9改进型客运电力机车

根据我国铁路列车提速的需要，对原SS9机车存在的问题进行改进。简要介绍SS9改进型大功率客运电力机车总体结构、技术特点及与原SS9机车不同之处。运行表明，机车性能良好，满足铁路提速要求。     

已建码头升级改造工程的几种实用类型

介绍了对已建码头进行升级改造工作的基本程序及几种实用的改造工程类型实例。     

广州地铁车辆国产化改造的粘着利用控制

针对广州地铁车辆对粘着利用的要求,采用了基于相位法的粘着利用控制方案,并使用粘着利用效率来衡量粘着利用控制在机车空转滑行时的控制效果。现场试验结果验证了控制方案的有效性。     

基于双面双弧焊接工艺的焊接接头残余应力及变形分析

本文采用数值模拟手段和小孔法测试试验,对新型双面双弧焊接工艺和现行单弧焊接工艺下船体高强度钢对接接头焊接过程及焊后残余应力、变形进行对比分析,为双面双弧焊接的实际应用及大面积推广奠定工艺基础。     

Residual circulation and sediment distribution in the Ria de Aveiro lagoon, Portugal

A two-dimensional hydrodynamic and sediment transport models have been developed and applied to the Ria de Aveiro lagoon, Portugal. The application consisted in the study of the residual circulation, the residence time as well as the sediment dynamics in the lagoon. High residence time for particles situated at the far end of the main channels points out that they are retained for a long time and tend to remain there, with high probability of being deposited into the bed. Low residence time for the central areas implies that the particles are flushed out more rapidly toward the lagoon mouth, revealing that the water and the particles exchange are very effective there. Although the residual circulation due to the rivers induces an overall transport toward the lagoon mouth, the residual circulations due to the winds induce particular circulation patterns (clockwise or counter-clockwise eddies) at some locations of the lagoon, depending on the wind direction. It was found that the suspended sediment concentrations along the main channels are induced by tidal asymmetries (resulting in areas of ebb and flood dominance), as well as by the wind stress and rivers runoff effects. They contribute, in general, to increase the sediment export toward the ocean, although the wind stress may induce currents and circulations in the opposite direction of the tidal currents. High turbid zones are observed for strong tidal currents, associated with tidal asymmetries, as well as with high rivers runoff. The erosion–deposition budget indicates a tendency for sediment accumulation at important areas of the lagoon, namely the shallow ones.