The marine electronic highway in the Straits of Malacca and Singapore—an assessment of costs and key benefits

The Straits of Malacca and Singapore are an important trade route linking the Indian Ocean to the South China Sea and Pacific Ocean. They are also rich in resources and support a range of activities that benefit the economies of the littoral states (Indonesia, Malaysia and Singapore). This important shipping route is a very congested waterway and the authorities are keen to improve navigation facilities to promote ship safety and reduce the risk of groundings, collisions and accidents. This will also help to protect the marine environment from the effects of pollution and hence reduce its damaging impact on activities related to the Straits, e.g. fisheries and tourism. The Marine Electronic Highway (MEH) is an attempt to bring together maritime safety technologies and environmental management systems. The paper examines the costs of providing such a highway and considers some of the benefits which could accrue from its implementation. The analysis, conducted in the form of a cost-benefit study, clearly shows the economic viability of the scheme.     

寒冷地区中小跨度桥铺设无缝线路体会

结合长大线、哈长线和京通线三座有碴桥上无缝线路设计,介绍寒冷地区中小跨度有碴桥上铺设无缝线路附加力计算方法、无缝线路允许温升和温降以及墩台检算结果,说明寒冷地区中小跨度有碴桥上满足铺设无缝线路的条件,并指出养护维修中的注意事项。     

The Nigerian shipping industry and indigenous shipping companies

The shipping industry in Nigeria since the early 1990s has been experiencing a continuous disastrous downturn. Nigerian shipping companies' participation in international shipping has continued to be very limited. Their presence and impact is hardly felt in the world's shipping industry. Both the national carriers (that is shipping companies with national carrier status) and other indigenous private shipping companies have vessel as well as management problems. These problems have led to the poor performance of the Nigerian shipping industry for over a decade now. The carriers in the industry are not attaining for the country the gains that are supposed to emanate from shipping. This paper points out the importance of shipping to a nation, identifies the problems the country's shipping companies are facing and proffers solutions that include merging of the companies to have strong financial standing and a competitive edge.     

大体积混凝土施工措施

分析大体积混凝土温度裂缝产生的原因,采取相应的技术措施来降低混凝土内部与表面、表面与环境之间的温差,从而避免温度裂缝的产生,确保大体积混凝土施工质量。     

低地板公交车结构轻量化研究

本论文主要通过对低地板公交车结构轻量化设计背景的阐述,低地板公交车轻量化技术作用和发展现状的研究,进一步讨论了低地板公交车轻量化技术所存在的不足,最后提供了实现低地板公交车结构轻量化的途径和在行业中的应用,从而为低地板公交车行业轻量化设计提供有效的帮助。     

造船博弈的下一个主战场

在全球新造船市场一片哀鸣,特别是常规船型需求回升无望之际,LNG船市场悄然走出低谷。去年,全球共成交了51艘LNG新船。今年仅1～2月就成交10余艘。一些船东正计划扩大LNG船队规模,并持续下单。这一现象与三大主力船型的市场窘态形成了鲜明对比。这不仅仅是一次短期的恢复性行情,更给造船企业带来了持续性机会。     

狭长型GPS控制网可行性论证

对GPS控制网两方向交会、两边交会及边角交会方法进行误差分析，总结了测角网、测边网和边角网的误差分析规律。指出当采用边角网时，可以允许小角度出现，从而论证了道路测量中采用狭长型GPS控制网的可行性。     

铁路路基病害无损检测的探地雷达信号分析与处理

为消除钢轨和轨枕对铁路路基病害检测的探地雷达信号的影响,提高实测剖面的检测能力,基于对两种干扰源在实测剖面上的时频分布特征分析,通过改进探地雷达天线的方式实现了对钢轨反射信号的屏蔽,采用预测反褶积和带通滤波相结合的方式,消除了轨枕形成的多次反射波对有效信号的干扰。去噪处理后的实测剖面可清楚显示翻浆冒泥等路基病害在基床、道碴层中的空间分布。     

Longhaul feeder services in an era of changing technology: an Asia-Pacific perspective

Traditional liner carriers, operating in the highly competitive commercial environment of the last few years, have attempted to lower the marginal cost of each box carried. Technological improvements in both construction and propulsion systems have led to a steady growth in carrying capacity. Ships of 600+ TEUs are now in service and, as a result of this trend, have displaced 'smaller' ships from the major east-west trades. The more competitive environment of these trades has in turn led to a redeployment of ships in the 2500+ TEU range to the north-south trades. The result has been a rapid increase in north-south capacity, including feeder services and falling freight rates. Despite the current excess supply in shipping and historically low freight rates, significant developments in technology have created opportunities for new fast containerships. The paper analyses the key economic factors in the differentiation of the new fast ship technology from the traditionally designed containerships and demonstrates the potential financial viability to owners of these new 'greyhounds'.