浅埋暗挖法隧道施工对地下管线保护安全技术研究

针对浅埋暗挖法隧道施工对既有电力管线的影响进行理论分析和技术方案研究,利用有限元软件就施工对周围土体的影响进行模拟,并通过现场监控量测,在此基础上总结出类似工程的共同规律。实践表明:在城市浅埋、大跨、地下管网密布和软弱地层条件下暗挖隧道,采用CD法、CRD法初期支护系统配套小导管或管棚注浆,能有效控制地表下沉,维护土体稳定。结论为对电力方沟的沉降变形预测需综合采用理论分析和工程类比相结合的手段。地面沉降会给各种地下管网线路的正常运行带来影响,应根据各种管网线路的结构及可变性情况,结合沉陷槽分布规律进行综合考虑。应对控制基准深入分析,以确定安全、经济的控制标准。     

计算机联锁系统维护方法和措施

通过分析计算机联设备结构、工作状态以及在工作中积累的经验,探讨与之适应的维护方法及措施。确保系统的安全性、实时性、可靠性以及高速处理能力,更好地为铁路安全生产服务。     

东风7G-C型机车轮对注油压装工艺开发

阐述了机车轮对组装中的注油压装工艺极限油压的计算方法,压装中应注意的问题以及解决方法。     

Enforcement of law by the Port State Control (PSC)

Since the International Maritime Organization (IMO) introduced the Port State Control (PSC) programme in 1982, it has been playing a vital role in the enforcement of safety law at sea worldwide. This paper addresses the effectiveness of PSC and the effectiveness of the methods for selecting ships to be inspected adopted by regional PSC. Data on ship total loss (from 1973-2003) and on the PSC records (from 1994-2005) have been collected. The study reveals that the enforcement of PSC is effective in improving the safety level of maritime transport. The methods adopted by regional PSC are compared on their effectiveness, efficiency and stability in identifying substandard ships. Suggestions are made on the improvement of the enforcement of PSC.     

某打桩船桩架强度计算及分析

为了检验该船在近海水域,超长超重桩的施工,对该船的桩架在起吊、立桩、变幅、打桩等各种工况下的强度,依据规范进行了建模验算,得出桩架在各种工况下各部位的应力分布情况及最大应力发生的部位,并根据验算结果进行分析,提出加固方案和注意事项,使得该船满足施打超长超重桩的能力。     

上海港集装箱货源综述及增长潜力

2004年是中国港口全面发展的一年，其中上海港集装箱吞吐量与去年同比增长29％，达到了1455万TEU，仅次于香港和新加坡，位列世界第三。但值得注意的是上海港的国际中转量仅为1％左右，绝大部分货源仍然是来自长江三角洲地区，而且在相当长的一段时间内都会维持这种格局。按照上海港务局的预计及发展目标，到2020年上海港将成为世界上最大的贸易港。     

Numerical simulation of three-dimensional combustion flows

A finite-rate method is used to simulate the three-dimensional combustion process in a plasma generator with CH4 as the fuel. The simulation was run with RNG k-ε model to simulate turbulence, with eddy-dissipation-concept （EDC） model to simulate the combustion and with discrete ordinates model to simulate radiation. The numerical results show that the flow field characteristics and the parameter distributions are under the condition of rich fuels, and these results provide valuable information when optimizing the plasma generator design and organizing its flow fields.     

提高外贸企业在海运市场中的地位

从码头作业费（THC）的收取分析外贸企业在海运市场处于弱势地位的原因,提出我国外贸企业提高其在海运市场地位的设想.