现代信息技术对未来航海的影响

从国际互联网（Internet),3S(GIS,GPS,RS)数字地球与数字海洋等信息技术的角度出发,分析了现代信息技术对未来航海的影响,论述了第的信息系统构架。     

中国公路运输货运代理业发展的若干问题

在分析中国公路运输货运代理业的法律性质,责任及存在的主要问题的基础上,对如何发展中国的公路 运代理业提出了相应的建议。     

舰船抗爆领域水下爆炸载荷研究进展

海战中水下爆炸载荷是舰船的重要威胁之一,为了给舰船抗爆研究提供准确的载荷输入,需要对载荷进行系统研究。通过查阅大量文献,介绍了国内外舰船抗爆领域水下爆炸载荷的研究概况,从冲击波载荷和气泡载荷两个方面总结了该领域的研究进展。由于冲击波载荷的研究比较成熟,重点对气泡运动方程、气泡射流等气泡阶段的研究工作进行了总结和分析。并且在分析前人工作的基础上对该领域有待进一步解决的问题和发展趋势进行了展望,为该领域内研究工作的开展提供一定参考。     

高职院校单独招生改革试点工作的实践探索

按照教育部提出的“学校负责、自我约束、行政监督”的工作原则,本文结合我校2008年单独招生工作,以建立运行机制、监督机制和录取机制为切入点,在探索引导普通高中毕业生向优质高等职业院校合理分流、多样化选拔录取机制方面做了有效实践和探索。     

论基于生命线工程的城市桥梁防灾减灾

进入21世纪以来,随着我国城市化进程的大力推进,各地的城市桥梁建设得到日新月异的发展,呈现出大规模城市桥梁建设的新高潮。与此同时,针对各地频繁出现一些灾害事故,国家住房和城乡建设部发布了"关于建设系统防灾减灾工作的意见"。该文首先诠释了作为城市生命线工程的重要组成部分——城市桥梁防灾减灾的内涵,通过对发生在美国、日本和中国的7个防灾减灾典型案例进行综合分析,客观地指出了当前我国城市桥梁防灾减灾的现状和存在的问题,指出了当今国际桥梁界在该领域的发展趋势,并提出了相关对策建议,以期引起人们对城市桥梁的防灾减灾问题的高度重视,推动我国城市桥梁建设的健康和可持续发展。     

On the effect of operational service attributes on transit satisfaction

Public transport (PT) providers aim to offer services that meet users’ satisfaction, and for this, they can control some operational service attributes such as frequency, speed, crowdedness and reliability. Understanding how these objective attributes affect user satisfaction is essential to improve it cost-effectively, but these associations have not been examined enough in the PT literature. This study aims to unveil how key transit operational variables actually experienced by users affect their satisfaction. We analysed data derived from a multiannual consumer satisfaction survey for the Santiago de Chile Metro system; between January 2013 and June 2016 (n?=?41,993), where approximately 1000 questionnaires were completed each month. We also gained access to a set of operational variables managed by Metro for the same period, including more than 1.4 million records. With this unique dataset, we first developed a structural equation model (SEM) with users’ perceived attributes, finding that safety, ease of boarding, response to critical incidents (CI), the number and type of CI endured, and information, were the variables that mostly affected satisfaction. We also examined heterogeneity in transit satisfaction with SEM-MIMIC models, by characterising the user population through their trip and socioeconomic characteristics, finding a striking result: that as users age they are more satisfied with the system. Next, we assessed whether including operational service attributes, such as crowding levels, frequency, commercial speed and CI, added predictive power to the proposed model. We found that the number of CI, speed, frequency and crowdedness, plus their variability (measured through the coefficient of variation), affected transit satisfaction at significant levels. Including these objective service attributes provided more explanatory power to the SEM-MIMIC transit satisfaction models. Policy recommendations for improving satisfaction, derived from our results, are: to implement an automatic control system for the number of passengers on Metro platforms (as safety and ease of boarding are critical issues for passengers); and to deploy a comprehensive tactical plan to address CI: determine which happen more often, take actions to minimise them and provide better responsive actions.

     

软硬交替地层超深地下连续墙施工技术

基于杭州地区上部软土、下部硬质岩的软硬交替地层中超深地下连续墙施工背景,文章针对杭州某地铁车站、过江隧道、供水管道等地下连续墙成槽时间长易导致失稳、成槽垂直度控制难、钢筋笼对接质量控制难等问题,通过采取台阶式交替开挖、超声波检测加强过程跟踪、钢板加焊修正槽壁前后偏差、千斤顶微调下笼姿态等施工技术措施,保证基坑工程的地下连续墙施工质量,接缝位置处均无渗漏水现象。     

关于《站细》规定进路防护的研究

新一代调度集中系统经过多年的研究和应用实践在我国已经投入使用。由于刚刚起步，所以有些地方还需要完善。就车站《站细》规定进路防护问题阐述了自己的观点。     

灰色预测的拓扑选择在运量预测中的运用

运用灰色系统理论及GM模型拓朴选择,建立了相应的GM(1,1)模型,运用于运量预测,并以港口吞吐量与货物周转量的预测为例进行校验。结果表明,新息GM(1,1)模型,新陈代谢GM(1,1)模型与原始模型(全数据GM(1,1)模型)三者比较,新陈代谢GM(1,1)模型的精度最高,值得推荐在运量预测中采用。     

砂卵石地层盾构施工地表沉降分析及对策

盾构法隧道施工时地表沉降仍然是施工控制中的突出问题之一。砂卵石地层中,由于地质条件的特殊性,地表沉降具有滞后性、隐蔽性、突发性,危害极大,是工程中急待解决的问题。结合成都地铁1号线盾构隧道的工程实践,对地表沉降进行监控量测,并对监控数据进行统计分析,找出变化规律,有针对性地采取相应的治理措施,较好地解决了富水砂卵石地层地表沉降问题。