排序方式: 共有93条查询结果,搜索用时 15 毫秒
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本文在总结贵阳市已建道路的使用情况的基础上 ,对水泥混凝土路面纵缝成因、纵缝宽度、拉杆作用等问题进行了分析 ;还对未设置拉杆的水泥混凝土路面使用情况作了调查 ,认为不设拉杆也无明显的使用缺陷 相似文献
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【目的】驾驶人在行驶中受交通应激事件的影响,为探索应激反应的程度展开研究。【方法】采用维也纳交通心理测试系统(VTS)甄选出高驾驶特性组(H组)和低驾驶特性组(L组)各21名被试进行试验,通过统计学方法分析不同驾驶特性群体的应激反应特征,并采用集对分析模型评价被试的应激反应优劣。【结果】研究结果表明:通过检测驾驶人的驾驶特性能力区分其应激反应能力可行,提高驾驶特性能够帮助驾驶人提高应激能力,情况越危急,提高的幅度越大。【结论】试验中,在所有应激距离下,H组的应激反应均优于L组,且应激距离的减少对L组的影响比H组大;在交通应激事件中为驾驶人提供1 s以上交通冲突时间是必要的。 相似文献
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QIN Ye 《上海交通大学学报(英文版)》2005,10(4):413-416,423
In order to evaluate recycle economy of end-of-life vehicles quantitatively,an economy model based on a recycle model of end-of-life vehicles and recycle cost analysis. With a practical example of recycling engines of end-of-life vehicles ,the validity of the recycle economy model and good recycle economy of the end-of-life vehicle engine were justified. It is concluded that ① remanufacture-ability of the part or component of the vehicles; ② the organization and management level of a recycle corporation; ③ policies and regulations of the government are crucial factors to raise the recycle economy of the end-of-life vehicle. 相似文献
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千岛湖大桥主桥设计构思 总被引:4,自引:3,他引:4
根据桥址处建桥自然条件的特点及位于著名风景区的地理位置要求,千岛湖大桥主桥采用(70+7×105+70+40) m多孔长联V形墩预应力混凝土连续刚构,基础采用大直径嵌岩钢管混凝土桩.着重介绍了大桥的桥型、结构整体构思及桩基结构型式选择与施工方案,并简述了主梁、主墩的设计与施工. 相似文献
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我国公路建设项目合同风险防范是公路建设项目决策和管理的一个较薄弱环节,为此应加强对公路建设工程合同管理风险的分析,确定风险防范的方法和措施,为公路建设项目的合同管理和项目决策提供有益的依据。 相似文献
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The injector is the most critical and vulnerable part of a diesel engine, and injector remanufacturing seems to be a solution to change the adverse market conditions. For remanufactured injector, there are some differences between China and developed countries. These differences make a different remanufacturability. New remanufacturing process should be evaluated to determine the feasibility. Fuqiang Power Company’s experiment and the survey from Bosch Diesel Centers (BDCs) show the status of the used injectors that nearly one-third of the used injector can be remanufactured with low cost. It is feasible to produce quality remanufactured injector under given process. Promoting clean diesel engine is more likely to be accepted by the consumer. 相似文献