关于广西内河船员计算机考试的探讨

文章基于广西辖区船员计算机考试现状,从考场建设情况、考试管理规定以及船员素质特点等方面分析了广西内河船员计算机考试存在的问题,并提出了相应的对策和建议.     

浅论救生衣在内河船舶航行中的应用

内河船舶救生衣配备存放及使用中存在着很多不规范之处,随着内河船舶的大型化进程,一些船员原本并不会游泳或者水性不好,导致船员失足落水溺亡事件的屡屡发生。本文通过分析这些这些不规范之处的产生原因,以及相应存在问题的应对措施,以供交流与参考。     

广西船员教育与培训的问题与对策

文章分析了广西船员发展的现状和趋势,探讨了广西船员教育与培训工作存在的问题,并提出了改进船员教育与培训工作的对策。     

内河船舶节能操作法

华中航运集团有限公司根据船舶特性进行实船调研,总结船员的船舶实操经验;组织专家多次跟船航行,记录七种节油操作方法船舶的耗油量,总结出具有规律性的操作技巧,并通过多次论证,提炼出一套系统的内河自航船舶节能减排操作法。     

新资讯

正世界首艘千吨级纯电动船下水——充电2小时可跑80公里世界首艘2000吨级新能源电动自卸船于11月12日在南沙整体吊装下水。该船总长70.5米,型宽13.9米,型深4.5米,设计吃水3.3米,配船员6人,是一艘以双电(锂电池十超级电容)为动力,采用2台电动机驱动直翼全向推进器(2×160 KW)作为其操纵和推进系统,载重吨为2000吨的内河新能源电动自卸钢质货船,货舱为斗式结构,装载货品为电煤,主要航行于珠江内河水域等。在该船下水仪式上,同时还举行了《内河双电(锂离子蓄电池、超级电容)纯电动船电力系统》标准发布活动。据了解,该船建成将填补世界同吨位内河双电驱动散货船的空白,船     

我国内河集装箱运输现状和发展目标

<正> 一、国内外内河集装箱运输的 比较与分析 (一)我国内河集装箱运输概况 我国内河集装箱运输刚刚进入发展阶段,目前全国有55个内河集装箱港口、120家航运企业开展了内河集装箱货运业务。 1、我国内河集装箱运输的特点 从地区分布上看,内河集装箱运输     

关于减少船员无序流动的分析研究

船员无序流动的事实与行业期望稳定船员队伍的意愿存在矛盾,其从多个方面严重危害了船员劳务市场的规范运行。从流动的事实、意愿和危害的角度考量被调研船员无序流动的程度,并给出了相应建议。     

清理行政审批 促进职能转变

在国务院公布的第一批取消的行政审批项目中,包括由交通运输部实施的国际船舶运输经营者之间兼并和收购的审核,承担船舶油污损害民事责任保险的商业性保险机构和互助性保险机构的确定,国际船舶代理业务审批,船舶修造、水上拆解地点的确定;由省级地方海事机构实施的从事内河船舶船员服务业务审批。而保留的行政审批项目,主要集中在安全监管和市场秩序监管领域。保留这些审批项目,主要出于三个方面考虑:一是履行安全管理和防治水域污染职责的需要;二是履行国际公约的需要,国际海事组织、国际劳工组织在船舶管理、船员管理以及防治船舶污染海域等方面制定了一系列公约,中国作为公约的成员国,必须遵循这些规则;三是维护国家主权、实施对等管理的需要,出于对国家主权和国家经济安全的保护,世界上很多国家在公路水路运输     

三峡库区船员管理模式现状与对策探讨

随着三峡库区的各项建设的进行,长江上游航运市场竞争的加剧,航运业对船员的需求也在不断提高,从数量型正在向质量型转变,企业的优胜劣汰与船员素质的参差不齐,使船员管理更加复杂。本文通过对三峡库区船员管理模式现状调查研究,分析了其存在的不足并提出了解决办法。     

广西沿海渔业船员素质分析

船员素质的高低是关系到船舶和乘船人员安全的重要因素。文章通过对广西沿海渔业船员素质现状进行调查,分析了广西沿海渔业船员素质较低的原因,提出了改变广西沿海渔业船员素质现状的相关措施,为提高广西渔业船员素质,减少事故的发生,提升渔业生产技术水平,以及进一步提高渔业生产人员生活水平提供理论参考。     

宽容性理念在路侧设计的具体体现

在交通问题中,路侧安全问题尤为突出。文章将宽容性设计理念引入路侧设计中,分析目前我国路侧设施存在的问题,汲取国外宽容性设计研究成果,提出适合我国的路侧设施的人性化合理设置方法,为今后的路侧设计提供参考。     

Simplical decomposition of the asymmetric traffic assignment problem

This paper presents a convergent simplicial decomposition algorithm for the variational inequality formulation of the asymmetric traffic assignment problem. It alternates between generating minimum path trees based on the cost function evaluated at the current iterate and the approximate solving of a master variational inequality subject to simple convexity constraints. Thus it generalizes the popular Frank-Wolfe method (where the master problem is a line search) to the asymmetric problem. Rules are given for dropping flow patterns which are not needed to express the current iterate as a convex combination of previous patterns. The results of some computational testing are reported.     

Evaluation of an existing bus network using a transit network optimisation model: a case study of the Hiroshima City Bus network

This study evaluates an existing bus network from the perspectives of passengers, operators, and overall system efficiency using the output of a previously developed transportation network optimisation model. This model is formulated as a bi-level optimisation problem with a transit assignment model as the lower problem. The upper problem is also formulated as bi-level optimisation problem to minimise costs for both passengers and operators, making it possible to evaluate the effects of reducing operator cost against passenger cost. A case study based on demand data for Hiroshima City confirms that the current bus network is close to the Pareto front, if the total costs to both passengers and operators are adopted as objective functions. However, the sensitivity analysis with regard to the OD pattern fluctuation indicates that passenger and operator costs in the current network are not always close to the Pareto front. Finally, the results suggests that, regardless of OD pattern fluctuation, reducing operator costs will increase passenger cost and increase inequity in service levels among passengers.     

浅淡广西机场客运快线发展思路与运营模式

文章分析了广西机场客运快线的发展现状及存在的问题,探讨了广西机场客运快线的发展思路,并提出了加快全区机场客运快线发展的运营模式。     

新大线管道杂散电流干扰的分析与防护

以新大线输油管线杂散电流干扰腐蚀问题为研究对象,进行干扰调查,并现场测试管地电位、土壤电位梯度、土壤电阻率和管线的杂散电流等参数.测试结果分析充分说明干扰来源于与新大线管道近距离平行的大连快轨3号线列车的运行,其特点是双向动态干扰,没有固定的阴极区和阳极区.提出采取增加阴极保护装置和极性接地排流方式共同防护来抑制杂散电流干扰,并客观分析排流效果.分析表明排流效果良好.     

A highway corridor planning model: QROAD

This model calculates an optimal investment plan for a highway corridor or number of corridors, subject to budget constraints. The available options include upgrading the current alignment, constructing a bypass highway over a different alignment, or various combinations. The budget constraints can be specified as a total budget restriction, or as an available budget each period. The highway system is described by K different road links. Each link consists of the current alignment which may be described by any number of sections, and a bypass section over a new alignment. The model finds the construction plan for each link that maximizes discounted benefits, subject to the financial constraints on the maintenance and capital expenditures. The problem is formulated as a large combinatorial optimization problem. A Lagrangian relaxation of the budget constraints is used, and the problem decomposes by link. A dynamic programming (DP) model is used to solve for the optimal expansion path for each link, given the dual variables. The sub-gradient dual optimization problem is a linear programming problem which is solved for the optimal dual variables. An application is presented based on the World Bank's Third National Highway Project in India, which is a US$1.3 billion project for upgrading approximately 2000 km of the Indian National Highway System. The project was approved based on results from this model.     

Optimal toll locations and toll levels in congestion pricing schemes: a case study of Stockholm

As congestion pricing has moved from theoretical ideas in the literature to real-world implementation, the need for decision support when designing pricing schemes has become evident. This paper deals with the problem of finding optimal toll levels and locations in a road traffic network and presents a case study of Stockholm. The optimisation problem of finding optimal toll levels, given a predetermined cordon, and the problem of finding both optimal toll locations and levels are presented, and previously developed heuristics are used for solving these problems. For the Stockholm case study, the possible welfare gains of optimising toll levels in the current cordon and optimising both toll locations and their corresponding toll levels are evaluated. It is shown that by tuning the toll levels in the current congestion pricing cordon used in Stockholm, the welfare gain can be increased significantly, and furthermore improved by allowing a toll on a major bypass highway. It is also shown that, by optimising both toll locations and levels, a congestion pricing scheme with welfare gain close to what can be achieved by marginal social cost pricing can be designed with tolls being located on only a quarter of the tollable links.     

南宁船检工作的新思路

文章针对南宁水运事业的新形势,分析了船检工作的现状与需求,并从船检人员的角度提出了船检工作的新思路。     

Techniques for inserting additional trains into existing timetables

In this paper techniques for scheduling additional train services (SATS) are considered as is train scheduling involving general time window constraints, fixed operations, maintenance activities and periods of section unavailability. The SATS problem is important because additional services must often be given access to the railway and subsequently integrated into current timetables. The SATS problem therefore considers the competition for railway infrastructure between new services and existing services belonging to the same or different operators. The SATS problem is characterised as a hybrid job shop scheduling problem with time window constraints. To solve this problem constructive algorithm and meta-heuristic scheduling techniques that operate upon a disjunctive graph model of train operations are utilised. From numerical investigations the proposed framework and associated techniques are tested and shown to be effective.     

天然气车辆推广应用政策措施研究

天然气车辆因其能源结构调整效益和节能减排效益,在道路运输行业应用日趋广泛。但同时,其后期应用过程中的问题也随之显现,为引导道路运输企业更加科学合理的应用天然气汽车,本文通过对当前天然气车辆应用现状的分析,总结应用过程中的问题,对天然气车辆开展成本效益分析,最终提出适合天然气车辆推广应用的政策建议。