游艇码头平面布置

随着中国经济的高速发展、人们消费水平的提高以及休闲娱乐方式的改变,游艇运动作为一种新的体闲运动方式逐渐在国内兴起.参考国外游艇码头设计标准和国内相关研究成果,对游艇码头平面布置进行了探讨.     

提高修船坞利用率的几点建议

船坞是修船厂的主要资源,提高船坞利用率就等于扩大产能,增加产量。文章就此课题提出建议,同时指出要给予坞修高定位,摒弃“以产值论坞修”的传统思维模式,理解和运用木水桶短板效应理论。     

粉煤灰在船坞升浆混凝土中的应用

船坞工程在预填骨料灌浆混凝土中,以往的施工经验是采用水泥砂浆作为灌浆材料,以水泥为胶凝材料,掺入细骨料、外加剂和水.阐述通过试验在水泥砂浆中掺入20%或30%的粉煤灰等量取代水泥,并应用到两个船坞工程.船坞一次性抽水无渗漏,表明粉煤灰作为胶凝材料的一部分替代水泥是可行的,并可降低工程成本.     

船坞虹吸灌水廊道驼峰断面负压特性的试验研究

在船坞灌水虹吸管的水力学试验的基础上,研究了虹吸廊道驼峰断面上的负压特性及其压强分布,驼峰断面上的负压未超出规范所允许的范围.试验结果表明,虹吸灌水廊道原型设计合理.     

Ten years after bus deregulation in Japan: An analysis of institutional changes and cost efficiency

The local bus market in Japan was deregulated in 2002. This study examines the impact of this deregulation on the market structure and the operators' cost efficiency over the last ten years. First, we perform a qualitative before-and-after-deregulation analysis of Japan's bus market, finding that there has been little change in the structure of the Japanese bus market so far. Second, we investigate the effectiveness of the deregulation and internal organisational factors by using a dataset of publicly owned (municipal) bus companies. We estimate the total cost frontier functions in order to examine their effects, showing that it is the internal organisational factors (i.e. governance structure) that affect the operator's efficiency, not deregulation. In fact, the coefficient of subsidies to companies is positive, with statistical significance, thereby suggesting that cost efficiency decreases as the subsidy ratio increases. The coefficient of the contracting-out (MCGL) dummy also obtains statistically significant results; thus, we provide an account of how contracting out clearly improves operators' cost efficiency. The deregulation variable did not show significant results.     

老码头改造中新老结构结合处理的实践

以镇江港某老码头改造的成功案例为背景,通过桩帽、轨道梁节点、新增污水池及端梁支座等4个典型结合部位的设计和施工实践,总结了在处理新老结构结合问题时常见的技术难点,并详细介绍了相应的处理措施以及一些新技术、新工艺的应用.     

Fallow land in old docks: Why such a slow take-up of Britain's waterside redevelopment opportunities?

The recent experience of Britain's derelict port areas indicates that the process of renewal and reuse is slow and is often restricted to arbitrarily few options. Successful schemes tend to be flexible, small-scale and piecemeal, while continued dereliction is generally associated with land set aside for the ambitious large projects. The political climate for dockland renewal tends to restrict opportunities for experimentation and immediate beneficial use. However, it is unwise to see old docks as too special. They are a peculiar part of the wider process of urban land use change. Successful operation or reuse depends on good relations with this wider social and economic environment.     

Evaluating the long term impacts of transport policy: An initial assessment of bus deregulation

Local buses in Britain, outside London, were ‘deregulated’ as a result of the 1985 Transport Act, with most of the organisational changes implemented in 1986 but many of the ownership changes occurring over a longer period. By contrast, in London, the 1984 London Regional Transport Act introduced a system of comprehensive tendering – but it took 10 years for the organisational and ownership changes to be fully implemented. This paper examines the long term impacts of these changes. A key issue when examining long term changes is that of the counterfactual – what would have happened if the changes had not occurred? An econometric model of the demand for local bus services in Britain is outlined and used in conjunction with extrapolative methods for key variables such as fares and bus kms to determine demand-side counterfactuals. Some analyses of subsidy and of costs will also be outlined. This will then permit the examination of welfare change by estimating changes in consumer and producer surpluses, updating earlier studies. It is found that outside London, bus demand declined strongly, at least up to the year 2000 and some of this reduction can be ascribed to deregulation. By contrast in London, demand has generally been increasing. However, in both areas operating costs also declined strongly, again up to 2000, but since then there have been strong increases in costs and subsidy. Our initial finding is that there are net welfare increases both outside and inside London, but with welfare increases per capita being five times greater in London than elsewhere. However, sensitivity analysis shows that our results are sensitive to the specification of the modelling system and assumptions made concerning the counterfactual, particularly for the results for London.     

"入世"后的航运业

1 "入世"给予航运业的机遇 加入WTO后,我国可以在100多个国家和地区享有最惠国待遇,这将有利于打破经济封锁,扩大出口.随着贸易的增长,占外贸运输总量70%的外贸海运量将以每年8%的幅度增加,这无疑将带动运输业务利润的增加,给我国航运业带来相当大的发展机遇.     

船舶碰撞后的处理

从船舶碰撞责任的基础知识出发，结合运实务，指出了碰撞发生后的处理程序，对船长及船东在发生此类海事后的处理方法提供了参考，有一定的指导意义。     

ISPS规则生效后USCG的检查特点

自2004年7月1日《国际船舶与港口设施保安规则》(ISPS规则)生效实施以来,美国海岸警备队(USCG)针对船舶保安情况的ISPS检查已实现了与传统PSC检查的无缝对接,港口国检查的概念已得到扩展延伸,为便于区别,传统的PSC检查被称为PSC安全与环境保护符合性检查(PSC安全检查),针对ISPS     

金融危机后船舶投资新趋势

金融危机以来,各国纷纷采取宽松的财政政策来刺激经济,2010年全球经济开始走出低谷,全球贸易量呈恢复性增长态势。各国航运业自身进行恢复性调整,航运市场出现阶段性回暖,全球融资环境有了一定程度的改善。同时,航运市场和造船市场格局也在发生巨大变化,船东在船舶投资上也出现了一些新的特点和趋势。     

轴带发电机断路器跳闸后自动合闸设计

本文论述轴带发电机DW98断路器的性质,当负载故障跳闸时,通过设计PC控制选择性的自动合闸,接通舵机等重要负载,确保船舶安全航行。     

GMDSS实施后的船舶通信方式

GMDSS的实施使得海上通信系统的通信功能更加完善，通信性能更加可靠。本文分析了GMDSS实施后不同通信方式和通信系统的优缺点，为船舶选取适当通信方式提供了有效的参考。     

时效处理对海洋用AA6063铝合金耐腐蚀性的影响

AA6063铝合金由于其优异的性能,被广泛应用于造船领域,然而由于海水这一腐蚀性流体与船体的相对运动能够加速金属的腐蚀速率,因此采用AA6063铝合金制造的船体部件容易受到侵蚀和腐蚀。为了解决这一问题,对AA6063铝合金进行时效处理是较为有效的手段之一。本文对时效处理对海洋用AA6063铝合金耐腐蚀性的影响进行研究,采用3.5%的氯化钠溶液模拟人造海水,对经过时效处理的AA6063铝合金进行腐蚀试验,最终结果证明,通过人工和自然时效处理相结合的方法,能够较为明显地提高AA6063铝合金的耐腐蚀性。     

TWO入世后的水运大有作为--访交通部WTO专家王明志博士

中国入世,为我国经济发展掀开了新的一页.最近,本刊记者就WTO"海运服务贸易谈判"的情况及"WTO与中国航运业发展前景"问题,采访了曾参与研究起草入世文件的王明志博士.     

TC4合金的超声空穴腐蚀研究

TC4钛合金(Ti-6Al-4V)是当前产量最高,应用最为广泛的钛合金之一,其具有耐腐蚀性好、强度高、密度低等优点,在航空航天、造船、机械制造等领域发挥着至关重要的作用。当前,超声技术是提高TC4合金耐腐蚀性的主要手段之一,其能够以较低的成本显著地提高TC4合金的耐腐蚀性。然而,对于经过超声处理的TC4合金的耐空穴腐蚀性能,仍然未有研究。在燃气轮机、船舶制造等领域,空穴腐蚀是TC4合金面临的主要威胁,本文所做的工作具有一定的借鉴意义。     

先简支后连续箱梁桥支座病害分析

以某高速公路甄坟沟大桥为对象,在对带有纵坡和横坡的先简支后连续箱梁桥的橡胶支座病害认真调研的基础上,结合结构性能进行深入探讨,认为橡胶支座为复杂超静定体系,病害产生是结构性能、施工等综合因素决定的,因此转连续后带来的影响因素很多,先简支后连续箱梁在具有横坡和纵坡的结构中不宜采用橡胶支座。     

门机门架被船撞击变形的修复

介绍一次船舶碰撞门机造成的损伤情况,科学制订修理工艺,进行门架变形损伤的修复。     

AIS、CCTV等设备互联互通后整合优势及功能拓展

本文是作者对船舶自动识别系统(AIS)与甚高频系统互联后的功能拓展、工业电视系统(CCTV)与雷达数据处理系统互通后的功能完善和增设监控系统方面的几点思考。