"长三角"区域船舶工业的结构优化研究

随着世界船舶工业的东移,针对目前“长三角”的船舶工业结构中投资规模过大及重复投资,资本密集的大型修造船坞、硬件设施缺乏,低水平的行业内部恶性竞争,结构优化不合理,专业化、特色化的产业链发展格局有待进一步优化,船舶检验质量有待提高等问题,提出“长三角”区域船舶工业合理发展的结构优化建议。     

航运企业集团市场租入船经营效益考核的探讨

对市场租入船开展经营业绩考核,是航运企业集团实现管理创新的新课题。本文结合航运企业的实际和租入船经营的特点,提出了市场租入船经营效益考核的总体思路,制定了考核指标及考核标准的测算模型,既关注了经营风险的控制,又重点突出了经营效益的考核与激励,在实际应用中产生了明显的管理价值。     

改善航道条件促进沿江经济发展

本文在分析长江航运发展现状的基础上,阐述了影响长江航道,尤其是江苏段航道发展的因素,提出了提高长江下游江苏段航道通航效率的对策。     

内河航道数字化测量船数据应用研究

内河数字化测量船的应用,为快速、准确获得全省内河航道水下地形数据提供了支持和保障。文章着重从航道断面数据的生成、航道疏浚设计和岸线探测等几方面介绍了测量船成果数据的应用。     

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随着航运联营与联盟形式的出现,航运公司的船队及航线规模不断扩大,航线优化及运力配置变得更为复杂.本文结合航运业发展实际,在对传统的班轮航线配船模型进行改进的基础上,建立新的模型应用到航运联盟情况下航运公司箱位租赁决策与航线规划中.结果表明,在自身运力不足时,航运公司通过航运联盟箱位租用,对降低其系统成本、弥补航线运力、保证完成货运任务、加快船舶航班周期等的方面有突出的优点.     

大水位差架空直立式集装箱码头结构型式研究

结合三峡工程建成蓄水后库区港口航道水域特点和地形特点,充分考虑长江航运发展、长江上游重庆航运中心的建设等需求,以及码头建设对长江航运通航条件、通航环境安全及行洪能力的影响,对各种适合集装箱装卸的码头结构进行了全面归纳、分析、筛选,提出了在长江上游30 m以上大水位差条件下5种比较适合于集装箱装卸的码头结构方案。     

吃水受限内河船舶航行性能综合优化的分层并行混沌算法

船舶航行性能综合优化设计分析是一项非常重要的工作。基于分层思想、并行算法和混沌算法,建立了吃水受限内河船舶性能综合优化的数学模型,设计了一种求解此类问题的基于敏感变量分段的分层并行混沌复合算法。编制了界面友好的VC＋＋软件。对于吃水受限内河船舶快速性和操纵性综合优化问题,进行了遗传算法、混沌算法、并行混沌算法和分层并行混沌算法的大量优化计算,结果表明：该复合算法计算可靠、效率高;为吃水受限内河大型船舶综合优良船型设计奠定了良好基础。     

某轮主机低速故障的分析及排除

本文就某轮主机出现的低速故障问题,从几个方面查找原因,通过对主机运行环境的分析,有针对性地解决主机出现的不良工况,最终解决了该故障。     

Open registry tanker operations: a comparative cost analysis

The pull of economic gravity on traditional tanker operators towards open registries has been caused primarily by the need to be cost‐competitive in a market which itself is competitive. By using transcendental logarithmic cost functions to model the cost structures of open and traditional tanker operations, this study highlights the general structure of the production technology of tanker services, the cost differentials between the two flag groupings and provides insights into the comparative statics effects of their production functions in the form of elasticities of factor substitution and demand, and scale economies.     

A demand model for recreational travel

A model is developed to describe and to predict the patterns of regional recreational travel. The model is designed in such a manner to allow its calibration and use without the need to conduct extensive travel surveys in a large region. To allow its use for prediction, the model is based on a causal structure and attempts to derive recreational travel demand from behavioural variables. The main hypothesis of the model is that the amount of recreational travel a recreation area attracts is affected by the accessibility of this area to points of demand potential and by its attractiveness relative to the recreation areas.

The calibration is founded on actual data on recreational travel to national forests in California, U.S.A. It is found in the calibration that accessibility to demand potential is the single most important determinant of recreational travel attraction. A simple relationship is derived to relate travel to each national forest to the relative accessibility of the forest. The model is calibrated and statistically validated.

It is suggested that when constructing travel demand models simplicity be sought, even at the risk of the loss of some explanatory power. In the calibration of such models statistical significant is more important than the ability to reproduce observed patterns.