The role of dry port in hub-and-spoke network under Belt and Road Initiative

Dry port plays increasingly an important role in the integration of inland regions with seaports, and cross-border inland ports especially in the context of Belt and Road Initiative (BRI) originally proposed by China. This paper studies a logistics network connecting the inland regions by dry ports based on a two-stage logistical gravity model. First, a basic logistical gravity model is developed to analyze the radiated inland regions from dry ports, where the logistical quality of dry ports is calculated by principal component analysis. Second, considering mutual impacts among dry ports, seaports and cross-border inland ports, the influence of logistical gravity on the network is examined by using a coefficient based on the Ordered Weighted Averaging Operator in multi-attribute decision theory. An improved logistical gravity model is further developed to investigate the logistical connections among various ports (e.g. dry ports, seaports and cross-border inland ports; hub and feeder ports). Then, a hub-and-spoke network can be established. Dry ports are potential to connect to the Silk Road Economic Belt and the 21st-Century Maritime Silk Road. So a Chinese case is used to verify the proposed method. The strategies of embedding inland regions in the BRI are discussed based on the experimental studies.     

强浪条件下半掩护港区波浪场数值模拟

以以色列南部新建Ashdod码头为工程背景,在分析港区自然条件的基础上,利用二维河口与海岸模拟软件MIKE21,建立了基础方案各个施工阶段港内泊稳模型。通过对不同施工阶段下半掩护港区波浪场进行数值模拟分析,掌握了港内波浪场的分布情况,确定港内正常施工时防波堤口门处的容许波浪要素。根据防波堤口门处的波浪统计资料,得到港区不同区域的最大作业波高标准以及港区不同区域不同施工阶段下全年不可作业的天数。研究结果为工期的合理安排和作业窗口的确定提供依据,并提出了科学合理的施工工序建议。     

21世纪环保舰船的发展策略

随着海洋环保法规的日益严格和人类从事海洋活动的日益频繁,舰船排放污染物对海洋环境带来的污染问题已经得到了国际社会的高度重视。本文论述了一种面向21世纪的新型舰船———21世纪环保舰船,它是一种全新概念的舰船,从设计、采办、建造,到舰船的使用、维护与服务的全过程都体现了对海洋环保的要求,它是未来舰船发展的方向。     

瓯江口波流耦合作用下二维流场数值模拟研究

基于MIKE21 SW海浪模式,建立非结构网格下的瓯江口二维、双向波流耦合数学模型,对该海区波流共同存在下的二维流场进行了数值模拟,计算结果与实测数据吻合良好,且优于未耦合的结果,比较分析表明：考虑潮流作用大大改善了波高和周期的计算结果,使之更接近观测结果;波浪对潮位的影响较小,对流速的影响较大,其中落潮憩息时刻,波浪对流速的影响最大.     

Strategies of state and local government in management of urban transport problems – A case of Delhi

In India, different layers of Government control different policy instruments to tackle transport externalities which might result in coordination problems and possible efficiency losses. This paper, therefore, addresses the coordination problem resulting from the division of policy instruments between two different government levels that face different types of externalities in varying degrees of magnitude in the urban transport sector by developing three types of theoretical models: the Full Control Centralised Model where the state government has full control over all pricing instrument; a Nash equilibrium model where each of the government levels controls only one instrument and takes the behaviour of the other as given; and a Stackelberg equilibrium mode where the behaviour of the state government is influenced by the fact that one of the price instruments is controlled by the local government. With an empirical illustration of the model for Delhi, the paper finds that since there are many interactions and many externalities between the two levels of government, a division of roles between them does not guarantee an efficient pricing outcome and the efficiency of pricing would depend on the institutional set up and on the correspondence between the objective functions of the two government levels.     

引进丰田技术教育系统的实践与思考

丰田技术教育系统(T-TEP)的岗前培训、工学结合的特色明显,在引进T-TEP并经过2年多的实践,从课程设置、教学内容和教学要求等特点的分析入手对丰田技术教育进行了思考。在人文素质教育方面,应在高校教学上传承和发扬;在职业能力培养方面,学习先进的职教模式对专业培养计划等进行改革。     

小鼠肌肉组织特异性微小RNA miR-133a腺病毒表达载体的构建及表达

目的制备小鼠肌肉组织特异性微小RNA miR-133a的腺病毒表达载体并观察其在HeLa细胞的表达。方法利用PCR技术从小鼠基因组DNA扩增miR-133a前体对应的基因组片段,克隆到质粒pAdTrack-CMV,而后以同源重组的形式插入到腺病毒表达载体,由人胚肾293细胞包装,获得有感染能力的重组腺病毒颗粒。重组腺病毒感染HeLa细胞后,利用Northern blot检测miR-133a成熟分子的表达。结果①成功构建穿梭质粒pAdTrack-miR-133a;②成功构建重组腺病毒质粒pAdeasy-miR-133a;③293细胞包装获得有感染能力的重组腺病毒;④转染的HeLa细胞能够高效表达成熟miR-133a。结论构建了小鼠miR-133a的腺病毒表达载体,证实其转染HeLa后的表达,为后续研究miR-133a的功能打下了基础。     

沿岸往复流海岸电厂平面二维温排水数值模拟研究

应用Mike21FM模型对马来西亚沙巴电厂沿岸往复流海岸温排水进行了数值模拟,采用非结构化网格,率定了模型参数,建立了水动力模型,对取、排水口不同位置方案进行了数值模拟预测.分析结果显示,排水口位置的变化对温升分布影响较大,温度场几乎不因取水口位置的改变而变化;在水深较大位置进行温水排放对取水温升的控制更为有利;取、排...     

关于古代“海上丝绸之路”的几个问题

陆上丝绸之路大约出现于公元前13世纪,海上丝绸之路则是在公元前200年左右开始出现的.1840年爆发的鸦片战争,标志着古代海上丝绸之路的结束.陆上丝绸之路与海上丝绸之路是古代中国连接外部世界的两大动脉,但两者在分布方式、运输方式、对科学技术的依赖程度、外来民族移居方式等方面都有许多不同.古代海上丝绸之路与“21世纪海上丝绸之路”在内涵上有很大的不同,不能把两者等同起来.不过,古代海上丝绸之路与“21世纪海上丝绸之路”在精神层面及内在性质上有着共同的特点.     

长江“智能航道”系统架构与关键技术

在对长江"数字航道"发展状况和国内外智能水路系统现状的研究基础上,提出长江"智能航道"的基本组成和总体结构。通过长江"智能航道"系统基本特征和所具优势的分析,指出长江"智能航道"系统的若干关键技术,并对长江"智能航道"系统发展方向进行展望。最后提出了发展长江"智能航道"系统的若干建议。