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.     

系统电源不稳造成运行中的主变压器在过负荷时跳闸原因分析与探讨

由于系统电源不稳、牵引负荷过大,引起运行中的牵引主变压器保护装置出口跳闸原因分析与探讨,为确保电气化铁路的正常运输秩序,提出相应对策。     

区域港口建设项目投资风险预警管理系统研究

分析了我国当前区域港口建设中存在的问题,阐述了开展区域港口建设项目投资风险预警管理研究的意义,建立了区域港口建设项目投资风险预警管理系统的模型、预警指标体系及其评判方法,对珠江三角洲地区的港口建设管理提出了建议.     

A high order linear model for the prediction of internal lee waves at the main sill of the Strait of Gibraltar

A linear theory for the physical fields in the water column under the action of large amplitude internal lee waves at the main sill of the Strait of Gibraltar is developed. The procedure is a combination of the perturbation and normal modes methods in order to study steady resonant conditions. The lowest order linear approach of the methodology resumes the Taylor–Goldstein equation, which can reconstruct the main features of the observed fields but the high order approach gives the finest structure and sometimes the largest contributions. The role of the non-linear terms is investigated up to the second order taking into account the non-linear interactions between modes, leading to an effective reconstruction of the whole water column for the velocity field.     

在变革中重焕活力——访河北省铁路管理局局长侯智敏

长期以来，地方铁路发展与区域经济建设，一直是最为引人注目的话题之一。来自业内的各种争论，也在不断引起越来越强烈的社会反响。同时我们清晰地看到，对于这一涉及到千千万万百姓根本利益，关系到地方铁路未来走向的话题，仅仅停留在争论上是远远不够的，我们更希望听到地方铁路建设一线的声音。因此，我们不但邀请有关专家发表高见，同时走访了地方铁路改革的观察者和亲历者，希望把收获的感受、观点与实践经验与读者共享。     

新材料技术研发对潜艇及其装备的影响

叙述了国外新材料对保证和提高潜艇性能，减轻重量，降低建造和维修成本等产生的有利影响。     

基于海上舰艇编队的信息战效能评估方法研究

通过信息论的度量方法,结合海上舰艇编队的实际装备,建立了信息战效能评估的量化模型,分析了敌我双方信息对抗对信息战效能的影响.该模型可用于海军信息战仿真和评估.     

Estimation of origin‐destination matrices for a multimodal public transit network

This paper presents a procedure for the estimation of origin‐destination (O‐D) matrices for a multimodal public transit network. The system consists of a number of favored public transit modes that are obtained from a modal split process in a traditional four‐step transportation model. The demand of each favored mode is assigned to the multimodal network, which is comprised of a set of connected links of different public transit modes. An entropy maximization procedure is proposed to simultaneously estimate the O‐D demand matrices of all favored modes, which are consistent with target data sets such as the boarding counts and line segment flows that are observed directly in the network. A case study of the Hong Kong multimodal transit network is used to demonstrate the effectiveness of the proposed methodology.     

下一代网络中的软交换技术

软交换作为话音网向数据网融合的下一代网络(NGN)的主要技术,正日益受到业界的广泛重视。在软交换涉及的众多技术中本文主要对软交换的原理、体系结构以及所采用的通信协议等关键技术进行了介绍。在上述介绍的基础上,本文详述了软交换在国内外的研究情况并对软交换的前景进行了分析。     

在磁赤道校正磁罗经自差纪实

磁罗经是船舶航行的重要仪器之一,在PSC的检查中,如果它存在缺陷或自差表不在有效期内,将会给予17或30的纠正措施.本文从实际出发,就自行在磁赤道附近校正自差提出了具体的方法及体会,船员可参考实施.