先张法预应力空心板梁放张方法的探讨

传统的先张法预制空心板梁钢绞线的放张方法不能满足目前施工生产的需要,介绍一种对称切割钢绞线放张的施工工艺,保证了先张法预制梁板的施工质量。     

基于VTS的海事信息发布系统

此文论述了建立海事信息发布系统的必要性,并结合海上交通的发展,特别是VTS的使用, 提出了海事信息发布系统的总体结构和实现方式。实际应用表明,该系统能满足海事信息化、政务化和商务化的要求。     

DF8B型机车逻辑控制单元设计

从DF8B LCU功能需求出发，介绍了MVB与CAN总线两种通信网络特点，并对其性能进行比较，重点是MVB方案的LCU功能、硬件系统组成及软件设计。DF8B LCU简化了机车线路，提高了系统可靠性，完全满足机车性能要求。     

基于多媒体时钟的定时控制

由于Windows平台图形界面的易操作，使得在各行各业得到迅速的普及。这在工业控制领域也不例外，但是由于Windows操作系统在大部分情况下是以队列形式工作的，使得在Windows下实现实时控制成为了难题。利用多媒体时钟可以很好地实现Windows实时控制。     

Mixed analysis of shell and solid elements using the overlaying mesh method

 This article presents a mixed method of analyzing shell elements and solid elements using the overlaying mesh method. In the structural design of a ship's hull, the shell elements are used for the global model. However, the solid elements are necessary to analyze the stress concentration zones or the vicinity of a crack. In such cases, the models are analyzed using zooming analysis, in which the results of a global model analysis are transferred to a local model analysis by imposing boundary conditions. This method is more advantageous than zooming analysis in terms of the accuracy of the solution and the modeling flexibility. Some examples of a plate model with a cracked surface or with a projection are shown in order to demonstrate the effectiveness of the method. Received: August 6, 2002 / Accepted: November 25, 2002 Address correspondence to: S. Nakasumi (sumi@nasl.t.u-tokyo.ac.jp) Updated from the Japanese original, which won the 2002 SNAJ prize (J Soc Nav Archit Jpn 2001;189:219–224; and 190:655–662)     

Maritime accident investigation and temporal determinants of maritime accidents: A case study

This paper presents the results of an investigation into temporal determinants of maritime accidents based on a data-set obtained from the proceedings of formal inquiries in the former German Democratic Republic (GDR). The results show that there is no statistically significant outcome between the probability for an accident and the time of watch. Thus the results do not confirm previous studies, which reported significant time of day effects.The outcome of this study indicates that marine inquiries can provide useful data for an analysis of underlying causes of maritime accidents. It is suggested that accident inquiries should be extended into the area of watch systems employed and should record the hours of work and of rest of the officers on the watch involved in a maritime accident.     

The role of professional associations in shipping

This article is in three parts. The first covers the historical development of qualifying associations. The second covers the particular role of maritime institutions that include The Royal Institution of Naval Architects, The Institute of Marine Engineering Science and Technology and The Nautical Institute. The third and final section considers the future for maritime professional associations in the context of international shipping.     

集装箱岸桥钢丝绳应用的思考

介绍了从钢丝绳的组成要素与其选用,以及进口钢丝绳与国产钢丝绳制造质量差异分析,结合集装箱岸桥实际情况,选择合理性价比的钢丝绳。     

地震作用下高速铁路桥梁的动力响应及行车安全性研究

将桥梁在地震作用下的运动方程和车辆振动方程，通过桥梁子系统与车辆子系统间的非线性轮轨接触关系联系起来，建立可考虑多点激励与行波效应的车桥系统地震反应动力学分析模型。以某高速铁路连续梁桥为例，对非一致地震激励下桥梁结构的动力响应及桥上车辆运行安全性进行研究，提出确保地震发生时高速列车在桥上安全运行的临界速度限值，可供实际工程设计时参考。     

京广线提速道岔更换研究

铁路第六次提速,京广线要达到 200km/h,这就要求把既有线上的固定辙叉道岔更换为可动心轨辙叉道岔,消除辙叉有害空间。介绍了京广线既有道岔的现状和更换过程中存在的技术问题,并提出了建议。