排序方式: 共有46条查询结果,搜索用时 15 毫秒
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弯坡斜桥伸缩缝病害控制研究 总被引:1,自引:0,他引:1
分别从设计、施工、管理与养护等方面对弯坡斜桥伸缩缝的破坏原因进行分析。分析了弯坡斜桥伸缩缝的破坏机理。结合工程实际,对弯坡斜桥伸缩缝破坏的防治提出建议。 相似文献
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季昉 《铁道标准设计通讯》2018,(2):148-154
阜阳北编组站扩能改造工程将原三级四场规模的站场扩大至三级八场并同步配套生产设备、生活设施及既有下行解编系统整治工程。通过对阜阳北站既有站区供配电系统的调查和分析,基于阜阳北编组站扩容改造后的全站负荷计算,依据"尽量利旧"原则,从供电系统、一级配电系统及低压配电系统全面探讨编组站改扩建工程中电力供配电系统的设计思路和原则,并在35/10 kV变配电所低压侧无功补偿中引入电缆充电功率与传统容性无功功率补偿结合的无功平衡方案,以加强对编组站用电负荷功率因数的控制。通过对阜阳北编组站改扩建工程中电力供配电设计流程进行归纳和整理,以探讨形成流程化设计模式。 相似文献
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2009年一季度我国汽车市场能否走出“谷底”,以及何时走出“谷底”是目前车市焦点,文章用“车市波动分析法”分析中国2009年一季度汽车市场。对一季度车市取得的进展和成绩进行回顾,然后用1个系数(扩张系数)2种效应(扩张效应,收缩效应)为工具,对存在问题进行深层次剖析。对如何正视和解决走出“谷底”问题提出了明确观点:指出一季度我国车市仍在“谷底”运行,到2009年下半年有望冲出“谷底”平稳回升。 相似文献
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It is important and also challenging to plan airport facilities to meet future traffic needs in a rapidly changing environment, which is characterized by various uncertainties. One key issue in airport facility development is that facility performance functions (delay levels as functions of capacity utilization rates) are nonlinear, which complicates the solution method design. Potential demand fluctuations in a deregulated aviation market add another dimension to the decision making process. To solve this problem, a deterministic total cost minimization model is proposed and then extended into stochastic programs, by including uncertainties in traffic forecasts. After the exploration of properties of the delay cost function, an Outer-Approximation (OA) technique which is superior to the existing discrete approximation is designed. After model enhancements, an efficient solution framework based on the OA technique is used to solve the model to its global optimality by interactively generating upper and lower bounds to the objective. Computational tests demonstrate the validity of developed models and efficiency of proposed algorithms. The total cost is reduced by 18.8% with the stochastic program in the numerical example. 相似文献
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段瑞琼 《铁路通信信号工程技术》2008,5(5):33-34
本文参考国内多个地铁乘客信息系统并结合视频技术发展,对乘客信息系统设计中视频接口质量及长距离传输问题进行探讨,并推荐了相应的解决方案。 相似文献
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以某高速公路为例,通过对桥梁伸缩缝C50聚丙烯腈纤维混凝土配合比设计、伸缩缝安装施工工艺进行分析总结比较,对桥梁伸缩缝配合比设计及施工技术提出了改进建议。 相似文献
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