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盾构法施工具有安全、环保、高效的优点,在地铁隧道中被愈来愈多地采用。但目前盾构法施工成本相对较高, 其中管片制作费占盾构施工费的45%,因此,管片结构设计时选择合理的设计方法是降低盾构法施工成本的关键。结合南京地铁的地质和水文条件,分析了软土中盾构隧道结构计算方法,以及隧道内径、衬砌类型的选择;介绍了盾构隧道断面裂缝、直径变形、纵环向接缝验算方法。 相似文献
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1985年7月,纪念伟大航海家郑和下西洋580周年大会在南京隆重召开。这次大会,不但规模空前,声势浩大,而且肇启了郑和研究的热潮,标志着郑和研究进入了一个新阶段。纪念大会以来的十年,出版的各类专著、论文集、资料集等近20种,发表的论文达500余篇,远远超过1984年以前的八十年的总和。这样丰硕的成果,为人物研究、事件研究所罕见,也为学术界所瞩目。该文略述了十年来郑和研究的概况。 相似文献
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Airlines usually pay more attention tO maintenance cost for efficiency improvement and consumption reduction.However,airlines,especially the domestic airlines,Can hardly predict the cost exactly due to the uncertainty and complexity until now.In practice,the cost is calculated by collecting and calculating the invoices afterwards.To settle the problem,a maintenance cost forecasting model is proposed in this paper.Maintenance activities are classified into scheduled maintenance and unscheduled maintenance.Scheduled maintenance is periodic,in which the required materials and man-power hours can be obtained properly in advance.Nevertheless,it is impossible to acquire the necessary in formation of unscheduled maintenance.According to the specific characteristics of each,Activity-Based Costing(ABC)and Cost Estimating Relationships(CERs)are introduced to attack the building of forecasting models,respectively.Then practical cases,the 3C check of MD-90 and the engine shop visit are adopted tO verify the cost forecasting models proposed.The results show that the models not only can predict the actual maintenance cost successfully,but also are helpful tO drawing up the maintenance program and managing the maintenance funds efficiently. 相似文献
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NEURAL NETWORKS PREDICTION FOR SEISMIC RESPONSE OF STRUCTURE UNDER THE LEVENBERG-MARQUARDT ALGORITHM 总被引:1,自引:0,他引:1
Activecontrolandsemi activecontrolarenewapproachestoseismichazardmitigationofstructure .Whileinactivecontrolorsemi activecontrol ,mea surementofstructurestate ,transmissionandcalcu lationofsignalandinflictionofcontrolforcerequiretime ,moreover ,controlforceiscalculatedaccordingtotheseismicresponseofstructureinlastepoch ,sothecontrolforceinactivecontrolorsemi activecontrolmaybedistortedduetotime delay .Suchdistortionusuallyincreasestheseismicresponseofstructureandmakesstructuremoredangerous[1-3… 相似文献
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针对分队训练辅助裁决系统的重点和难点问题,基于3G网络技术,分析了基于3G的分队训练辅助裁决系统中的战场态势显示、导调过程数字录像、导调辅助裁决等三种关键技术,为分队训练辅助裁决更具有客观性、及时性、科学性,提供数据基础,提高裁决的可信度和公正性。 相似文献
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沈惠俊 《铁道标准设计通讯》2005,(6):82-83
为保证宁芜铁路的正常运营,针对南京市双桥门立交施工,详细介绍对铁路进行支护的施工方法及注意事项。 相似文献
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地铁运营设备管理维护保养模式的综合评价 总被引:7,自引:4,他引:3
简要论述城市地铁系统构成,总结维护保养模式研究的基本理念,分析现有维护保养模式的特点,提出了一套适合我国地铁运营管理维护保养模式的评价指标体系. 相似文献