爆炸荷载作用下的舰船防护舱壁的承载能力(英文)

大型水面舰船的防护舱壁需要设计成工作在薄膜应力状态下.利用能量法推导了在爆炸荷载作用下防护舱壁塑性大变形的计算公式、探讨了防护舱壁的最大承载能力,对防护舱壁的设计要求进行了讨论.与国外发表的有关试验结果进行了计算比较,结果表明该方法具有一定的应用价值.     

新造船能效设计指数介绍及分析

二氧化碳排放一直是航运界关心和关注的焦点,国际海事组织IMO第57届环境与保护委员会MEPC57、MEPC58、MEPC59次会议以及温室气体工作组第二次会议上对此都进行了激烈的讨论.根据所收集到的资料,对新造船能效设计指数EEDI(原:新造船CO_2指数)进行了分析和研究,并对减少二氧化碳排放可采取的措施进行了探讨.     

各运输方式的竞争性与协作性的识别研究

在连接两城市的多种运输方式间存着竞争、协作的关系,本文是通过设立两个虚拟转运地,构建交通运输网络图的方法,把运输方式间运量的转移问题转化为运输通道间运量的转移问题进行研究,综合分析当某种运输方式的运费或运行速度（即运行时间）发生变化时,各种运输方式承担客运量的变化情况,从而推理出各运输方式间的竞争性与协作性的相应结论,并给予证明和实例验证。     

基于能量熵的船舶电力系统脆性分析

首次将能量熵引入到船舶电力系统脆性研究中,定义研究船舶电力系统的电压熵、电流熵、频率熵.通过对船舶电力系统能量熵的研究,为船舶电力系统脆性熵的研究提供理论基础和重要的参考依据.仿真表明,能量熵能反映船舶电力系统的脆性特性.     

一种回收排水热的新型热泵式热水器的设计

针对目前生活洗浴热水需求上涨以及生活洗浴热水排水热存在巨大浪费的情况,分析了生活洗浴热水排水热回收利用的可行性,提出了一种回收排水热的新型热泵式热水器,介绍了该热水器的结构和工作原理,完成了其总体方案的具体设计．回收排水热的新型热泵式热水器具有高效、运行可靠、节能、环保等优点．     

双层开孔消浪板结构消能性能分析

双层开孔消浪板是一种新型消能结构,其结构通过上层开孔板和下层实心板两部分来解决结构的消能问题．文中通过模型试验的方法来验证结构的消能性能,同时,对双层开孔消浪板结构在规则波作用下的消能系数随3个主要影响因子（相对板宽B／L,相对开孔A／A0,波陡H／L）变化的结果进行分析．通过分析和比较消能系数与影响因子之间的相互关系,证明双层开孔消浪板结构具有较好的消能效果．     

抓好三个环节 促进节能减排

随着我国能源的日趋紧缺,能否以最少的消耗,取得最好的发展效果,已经成为衡量当今经济社会发展是否科学的一个重要尺度。文中针对海事系统能源管理方面还很薄弱,还处于粗放管理的现状,通过完善计量装备,科学合理地制订能源消耗定额,夯实能源统计基础工作,做好计量、定额、统计这三个关键环节的工作,做到能源消耗有计量、有定额、能源统计数据准确翔实,促进海事系统节能减排工作。     

A traffic analysis zone definition: a new methodology and algorithm

This paper develops a comprehensive approach to the definition of transportation analysis zones (TAZ), and therein, presents a new methodology and algorithm for the definition of TAZ embedded in geographic information systems software, improves the base algorithm with several local algorithms, and comprehensively analyses the obtained results. The results obtained are then compared to these presently used in the transportation analysis process of the Lisbon Metropolitan Area. The proposed algorithm presents a new methodology for TAZ design based on a smoothed density surface of geocoded travel demand data. The algorithm aims to minimise the loss of information when moving from a continuous representation of the origin and destination of each trip to their discrete representations through zones, and focuses on the trade-off between the statistical precision, geographical error, and the percentage of intra-zonal trips of the resulting OD matrix. The results for the Lisbon Metropolitan Area case study suggest a significant improvement in OD matrix estimates compared to current transportation analysis practises based on administrative units.

A copula-based joint multinomial discrete–continuous model of vehicle type choice and miles of travel

In this paper, a joint model of vehicle type choice and utilization is formulated and estimated on a data set of vehicles drawn from the 2000 San Francisco Bay Area Travel Survey. The joint discrete–continuous model system formulated in this study explicitly accounts for common unobserved factors that may affect the choice and utilization of a certain vehicle type (i.e., self-selection effects). A new copula-based methodology is adopted to facilitate model estimation without imposing restrictive distribution assumptions on the dependency structures between the errors in the discrete and continuous choice components. The copula-based methodology is found to provide statistically superior goodness-of-fit when compared with previous estimation approaches for joint discrete–continuous model systems. The model system, when applied to simulate the impacts of a doubling in fuel price, shows that individuals are more likely to shift vehicle type choices than vehicle usage patterns.

试述推进科学文明执法的对策

文章以科学发展观为理论基础,指出交通科学文明执法要适应社会发展的新要求,通过对玉林市交通科学文明执法所面临的问题进行分析,提出了推进交通科学文明执法的相关对策。