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As part of the preparations for entry into force of the Ballast Water Convention (2004), the International Maritime Organization
has initiated a process to evaluate the safety and efficacy of potential technologies for disinfecting ballast water on board
ships. Ballast Water Management Systems intended to remove potentially ‘harmful aquatic organisms’ are subjected to a review
process, one aspect of which is aimed at ensuring safety by assessing the risks of the systemto the environment, human health
(including the ships crew) as well as the safety of the ship. With 25 systems in the various stages of the evaluation process
and some already approved, this paper takes a first look at the types of systems under development, especially their environmental
characteristics and look for any emerging trends. Quite awide range of different technologies are being developed based on
chemical, physicochemical and physical mechanisms. Of these, chlorination by electrolysis in-situ is the most common and indications
are that such systems may become even more common. 相似文献
63.
Decentralization is a major theme of organizational change in shipping. It is often seen as ‘putting power back aboard ship’. However, the authors argue that this view is too simple. Decentralization poses fundamental questions about the entire management structure of the shipping company. The redistribution of authority necessary for decentralization is discussed in terms of the company organization structure. 相似文献
64.
Workshop 3A focussed on matters of institutional design that seem likely to improve public transport outcomes. It started by defining high level outcome goals, as measures of ultimate public transport success, and then identified the major societal issues that public transport systems can help to resolve. These issues were separately defined for Southern African and western settings. The importance of taking an integrated approach to transport, particularly land use/transport integration, was seen as fundamental to goal achievement. Workshop papers provided many and varied examples of this importance, ranging from PPPs for major public transport projects to system design issues and contracting out of services. The Workshop included detailed discussion on paratransit development in Southern Africa, where relationship management is proving to be critical, in-line with much previous Thredbo discussion about the important role of trusting partnerships. Parallels and contrasts were drawn with paratransit in western settings. Competition in passenger rail was also a focus, with some questioning of the benefits of franchising. Discussion concluded by proposing recommendations for policy and research and suggesting agenda items for future Thredbo Conferences. 相似文献
65.
P.N. Smith 《运输规划与技术》2013,36(4):427-447
Abstract An intuitionistic fuzzy set (IFS) is a generalisation of a fuzzy set characterised by a truth membership function and a false membership function. The former is a lower bound on the grade of membership of the evidence in favour of a particular element belonging to the set and the latter is a lower bound on the negation of that element belonging to the set derived from evidence against that element belonging to the set. A similar concept is a vague set, though vague sets have been shown to be identical to IFSs. In the context of project evaluation, an IFS may be used to represent the degree to which a project satisfies a criterion and the degree to which it does not. Aggregation of such IFSs has been considered in recent years to identify a best project in terms of several criteria or factors. A particular desirable way to aggregate IFS is in terms of an ordered weighted average (OWA) which can be expressed in different forms such as arithmetic and geometric. In an OWA operator, weights are applied to the position of an element in the aggregation. In addition, hybrid OWA operators may be developed to not only weight the position of elements in the aggregation but the element itself. An example is given relating to the Kuranda Range Road upgrade (Queensland, Australia) which is limited by grade, poor overtaking opportunities, poor horizontal alignment and other constraints and the road is expected to become increasingly congested over the next few years. A more flexible multi-factor decision method is used to identify a ‘best’ project from a set of four alternative projects. 相似文献
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Vaubel Ulrich Barsness Richard W. Saltzman Arthur Haight Frank Prestwood Smith Paul Brown Peter 《Transportation》1974,3(2):185-192
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2003年3月,欧盟执行委员会按照4056/86号委员会规章而授予班轮公会的限制豁免法令.这项允许海运公司集体探讨并制定海运费用价格的豁免法令必须满足特定条件才能生效即必须产生经济利益;所产生的经济利益必须由海运公司及其客户均匀、公平分摊;班轮公会对于班轮服务来说确实不可替代;班轮公会不会遏制有效竞争的产生. 相似文献
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