沪苏通长江公铁大桥主航道桥公路钢桥面铺装技术研究

沪苏通长江公铁大桥主航道桥公路钢桥面铺装采用“环氧沥青混凝土EA10+高弹改性沥青混凝土SMA-10”结构.针对铺装材料受力复杂、低温施工难度大及摊铺时降温速度过快等技术难题,从关键环氧类铺装材料性能、钢桥面铺装施工工艺和环氧沥青混凝土EA10保温措施3个方面开展研究.结果 表明:国产环氧树脂粘结料和环氧沥青的23℃拉...     

汽车中控系统智能化发展研究

近年来,随着软件价值在整车中不断扩大,软件定义汽车的趋势也逐渐变为现实.然而由于安全的原因,导致车载软件发展相对迟缓.2014年,我国就将"智能网联汽车"纳入工信部发展规划之中,以数据驱动的车载软件正在成为定义汽车的显著特征.文章依托汽车智能化发展趋势,以汽车中控作为研究重点对象,针对其发展进程、电子电气架构、车载OS...     

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.     

奎先运营隧道空气质量卫生学评价

目的 为摸清当前车流密度下各不同工况内燃机废气分布规律、自然本底及意外状态下可产生的危害。项目 在奎先隧道内进行了空气中ＣＯ、ＮＯｘ、ＣＯ２及Ｏ２的测定。结果 列车在正常运营状态下产生的ＮＯｘ峰值为８０．９ｍｇ／ｍ＾３，ＣＯ为１１２ｍｇ／ｍ＾３，有害气体多集中于３、４测点，通过调查见，空气质量受车流密度的影响。车速对ＮＯｘ影响不明显，而对ＣＯ的影响较大，由于风向的变化，使隧道内有害气体形成涡流或紊流，使３测点出现多次高峰，由此可见１、５测点有害气体峰值滞后，自然排净时间长于第３测点。结论 应对奎先隧道现状进行治理。     

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。     

关于38号道岔信号工程设计

结合京秦线双桥站更换38号提速道岔工程设计,介绍了关于38号道岔信号工程设计的要点,并提出了2点需要注意的问题.