Determinants of the property damage costs of bulk barge accidents

This study investigates determinants of the vessel, cargo, and other-property damage costs of bulk barge accidents in US inland waterways. Tobit estimation of a three-equation recursive model suggests that, in bulk barge accidents: (1) vessel damage cost is greater for collision, fire/explosion, and material/equipment failure accidents than for groundings; (2) cargo damage cost is greater at night and when the weather is foggy and increases with barge age; and (3) otherproperty damage cost is greater for multi-vessel accidents, but decreases with barge size. A dollar of vessel damage cost increases other-property damage cost by $1.38, while a dollar of cargo damage cost increases this cost by $6.90. An important result for formulating bulk barge accident cost-reduction policies is that a given determinant might have a negative effect on one type of damage cost but a positive effect on another.     

Institutional reform in ports of developing countries: the case of Lebanon—part I: the plan

Upon the expiry of the concession contract signed between Lebanon and a private company for the Port of Beirut operation (in December 1990), the Government appointed a temporary commission to operate the port under the rules of the expiring concession. The legality of this measure has since always been questioned, while the temporary commission underwent three major personnel changes which clearly prevented any long-term thinking or planning. In 1998, the temporary commission entered into a 20-year joint venture for the establishment of a container terminal. Meanwhile, Lebanon's two main ports were facing major regional competition, while competing against each other to some degree. Thus, the need became urgent to end the temporary status and propose reforms to the entire sector. To that end, the Ministry of Public Works and Transport was commissed by the Government to propose a permanent institutional framework for the port of Beirut while assessing the need for a national maritime sector regulator. This paper presents the recommendations for the institutional reform of the Lebanese maritime transport sector.     

Lagrangian flow in the California Undercurrent, an observation and model comparison

During the period 1992–1998, 38 isobaric RAFOS floats were deployed to sample the subsurface flow of the California Undercurrent. The deployments, released over the California continental slope west of San Francisco, have sampled robust year-round poleward subsurface flow associated with the Undercurrent most seasons and the combined inshore current and Undercurrent in winter. Two other types of flow have been seen: a region of weak flow with little net displacement just west of the California Undercurrent, and an active westward propagating eddy field. This eddy field appears to be the primary mechanism for moving floats from the Undercurrent into the ocean interior. The observations and statistics from the RAFOS floats are compared with Lagrangian estimates of particles tracked in a global high resolution ocean simulation in order to evaluate the fidelity of the model along an eastern boundary. The results show that the model reproduces the general character of the flow reasonably well, but underestimates both the mean and eddy energies by a substantial amount.     

Estimation of wave-induced ship hull bending moment from ship motion measurements

A time-domain technique for estimating wave-induced ship hull bending moment from ship motion measurements is presented. This technique is developed to improve hull response monitoring systems. Artificial neural networks are used to model the time-domain relationship between the wave-induced vertical bending moment and the coupled heave and pitch motions. The application of the proposed technique is validated using experimental data.     

带整流负载同步发电机短路电流计算

该文对有阻尼绕组同步发电机整流系统和无阻尼绕组同步发电机整流系统直流侧短路时的最大短路电流进行了分析和计算,得出了随短路初始转子位置的不同,三相同步发电机整流系统直流侧短路电流峰值最大为交流侧最大短路电流,直流侧短路电流峰值最小可为交流侧量大短路电流值的0．933倍。     

45000吨化学品运输船主尺度数学模型建立

该文介绍了化学品运输船的发展历史和结构设计特点及安全规范。由统计资料回归出一套新的主尺度计算公式 ,该公式经实验证明效果较好。该结果可用于船型初步方案设计和新船的报价和合同设计。     

船舶稳性计算程序ESTAB

介绍了一个基于三维稳性计算方法的实用计算机程序ESTAB。采用三角形剖分技术和一些先进的算法,实现了船舶舱室和各种剖面的生成,可以可靠地获得各种载况下的浮态、不同纵向位置的进水角、各类型舱室的舱容要素曲线和船舶静水力曲线、邦戎曲线、插值曲线、静（动）稳性曲线、可浸长度曲线、弯矩与剪力曲线以及破舱时的浮态和破舱稳性。     

强化单车核算降低装卸成本

1 问题的提出 单车成本是指每台机械在使用过程中所发生的所有费用的总和.主要包括机械日常维修保养费用、机械大修理费用、动力燃料费用和技术改造费用等.对装卸机械实行单车成本核算及考核,就是制定合理的考核指标和考核办法,将每台机械在使用过程中所发生的所有费用的总和定期进行汇总、统计,并与考核指标对比,进行奖惩兑现,用经济杠杆制约人的行为,从而达到降低装卸成本的目的.     

PLC网络在散粮控制中的应用

介绍了MODICON公司Quntium系统PLC的双CPU控制方案及其在散粮工程中的应用,重点介绍了两种双CPU数据通信的方法。     

国际海上集装箱运输发展的态势——市场特点和挑战

国际海上集装箱运输经过50年发展已经日趋成熟,21世纪初在经济全球化的推动下,国际贸易发展趋势,诸多实力强大的国际班轮公司在制定和实施全球发展战略中,把船舶大型化作为结构调整和发展的特点,以致使国际海上集装箱运输业在未来几年中将进入一个重要的发展阶段。那么在这深刻的变化过程中,现阶段国际海上集装箱运输又有什么特点呢。