轮胎式集装箱龙门起重机采用锂电池供电节能改造项目

采用锂电池供电节能改造的RTG,可切实解决由大功率柴油发电机组驱动的传统RTG能耗大、运行成本高、高排放、高噪音等问题,并保留了传统RTG转场灵活的最大特点。在改造过程中不影响码头正常的装卸生产,并且不需要对码头基建以及配电系统进行改造和扩建工作,初期投资相对较低,对于一些操作维修人员紧缺、场地不规则、供电能力不足等情况的码头尤为适用。     

高速公路高密集互通群立交路段分离式断面标准论证

文章结合南京至马鞍山高速公路江苏段扩建工程,对高密集互通群立交路段分离式断面标准进行论证,从分析老路现状的拓宽改造条件入手,综合考虑高密互通群路段的断面方案,高密集互通群立交改造方案,高密集互通群立交交通适应性等方面因素,得出了功能清晰、服务水平高、交通运行均衡性良好、工程经济合理的扩建方案。     

关于桥梁箱梁结构切割拆除的施工技术探讨

随着我国交通运输业现代化建设的快速发展,越来越多的混凝土结构被拆除、新建、扩建和改造。由于现有混凝土结构拆除或改造所采用的传统施工工艺和设备特点,施工环境中存在许多不确定因素、安全性较差、施工难度大、经济性差等。在重庆陡溪立交改造在施工中,采用线锯机(简称"线锯")对桥梁进行切割和拆除,取得了良好的效果。本文对金刚石线锯设备的原理、主要参数的组成、施工工艺流程、操作难点和主要特点进行了总结和探讨,为以后钢筋混凝土拆除工程施工方法的选择提供了有益的参考资源。     

高速公路改扩建工程废旧道路材料再生利用技术

本项目分别采用泡沫沥青冷再生和水泥稳定冷再生技术对现有道路进行改造扩建,针对废旧沥青路面各结构层材料铣刨工艺、回收路面材料性能、再生混合料组成设计和施工工艺等关键技术问题进行了系统研究,编制了沥青路面泡沫沥青冷再生技术规范和沥青路面再生施工技术指南,实现了资源循环利用、节能减排,经济社会效益显著,推广应用前景广阔。     

福泉厦漳高速公路扩建工程总体设计

福泉厦漳高速公路是国家高速公路网沈海线的重要组成部分,是闽中南地区的交通主骨架.随着交通量的增长以及走廊带内其他通道的相继建设,迫切需要对原有道路进行扩建,本文就高速公路的扩建特点、扩建原则、扩建方式并结合工点实例进行介绍.     

沉箱现场预制及出运施工技术

本文以潮州港扩建货运码头工程(复工)为例,系统介绍沉箱现场预制场地及出运设计,现场沉箱预制及出运施工技术要点,并重点针对利用老码头作为出运码头的加固改造技术及沉箱预制活动底胎模的新工艺进行分析、探讨,旨在为今后类似工程提供借鉴和参考。     

关于拼宽桥梁方式合理性的探讨

本文以公路桥梁扩建方案为切入点,调查了青海省部分重要公路的桥梁形式,并对不同的扩建拼宽方案进行比较,提出了各类桥梁的扩建方案,以供相关工程参考。     

基于数值模拟分析的高速公路上跨高铁隧道方案研究

河南西部某高速公路改扩建工程在下穿的客运专线铁路上方施工,考虑施工及运营状态下隧道的安全,采用强度折减法对高速公路扩建前、扩建中及扩建后的隧道结构安全度进行了研究,同时对其防护措施及相应的效果加以探讨,以便为类似工程方案的选择提供借鉴。     

连拱桥加宽扩建设计与计算分析

文章依托某连拱桥加宽扩建设计实例,介绍了此类桥梁加宽扩建的设计要点,并采用Midas建立有限元模型,考虑连拱效应进行数值模拟计算,验算结果表明该主拱圈结构设计满足规范要求。     

推进山东民航事业持续、快速、健康发展

<正> 1988年以来的十年,是山东民航广大干部职工在山东省委、省政府以及民航总局的领导下,紧紧围绕全国和全省工作的大局,解放思想,转变观念,艰苦拼搏,山东民航取得显著进步和突出成就的十年,在许多方面都取得了突破性变化。 一、机场建设有大的发展。新建了济南遥墙机场,扩建和改造了青岛流亭、烟台莱山、威海大水泊、潍坊二十里铺机场,共新、扩建候机楼面积61596平方米、停机坪面积205350平方米、跑道总长10400米,分别是1987年的5倍、     

Analysis of factors affecting the choice of route of pedestrians

Pedestrians as compared to vehicular traffic enjoy a high degree freedom of movement even in heavily congested areas. Consequently, there are more alternative links available to pedestrians between a given origin‐destination (O‐D) pair. This paper describes a study done by the University of Calgary to evaluate the factors affecting the choice of route on intra‐CBD trips or trips within the Central Business District (CBD).

An origin destination survey conducted in downtown Calgary, Alberta enabled the identification of the most significant factors influencing the choice. These factors were analyzed in relation to the physical characteristics of the location, personal characteristics of the trip maker and the type of the trip.

It appears that most people chose the shortest link and factors such as the level of congestion, safety or visual attractions were only secondary. This suggests that the length should be made a major consideration when planning and designing pedestrian links.     

输油管道中原油乳状液的流变性研究

原油乳状液的流变性是原油开采后在管道中输送的重要研究方面,为了更好地研究这一性质,采用电动搅拌机、偏光显微镜以及流变仪等仪器来测定不同含水率的原油乳状液在不同条件下的黏度,观测不同含水率的原油乳状液在偏光显微镜下的形态。并且分别对原油乳状液的黏度与含水率之间的关系以及与剪切速率之间的关系进行研究,初步确定了所测区块原油乳状液的转相点以及该区块原油乳状液的流变特性,为生产中的油气集输提供了理论依据。     

Preliminary results of an analysis of areas of influence in Shanghai

The main deficiency of most current modeling approaches to transportation can be identified as neglect of the integration of existing geographical knowledge in regard to the ex ante transport/land use modeling approaches, with its focus on territorial dynamics and theory development. This paper addresses this aspect of the problem by introducing a theoretical and methodological framework for the analysis of the interrelationship between land uses. The analysis attempts to determine to what extent the functional land use in a city can be considered an ordered pattern. The order sought does not rely on purely spatial configurations, but on the correlation of transportation and land use. The first section of this paper focuses on theoretical considerations. It stresses the fact that conventional approaches do not apply in the present context. It then suggests an alternative based on areas of influence and measured in terms of level of attractance of land uses. The second describes a procedure based on this alternative following the remarkable contribution of Hanjoul, Beguin and Thill. An application of this procedure to the analysis of Shanghai is then examined. Finally, an evaluation of the strategies for optimizing the interrelationship between land uses is presented. The paper concludes with a possible research agenda.     

埋地管道防腐保温层失效评价

明确埋地管道防腐保温层的技术评价标准,对埋地钢质管道的安全运行,延长管道使用寿命具有重要意义。为了对埋地管道防腐保温层做出有效评价,从间接检测与开挖检测2个方面,结合现场检测数据,提出了基于防腐保温层的电流衰减率、绝缘电阻率、质量状况与厚度的分级评价标准及基于4种评价指标的综合评判方法。工程实践表明,该评价标准对防腐保温层是否存在失效能做出有效判断。     

城市轨道交通杂散电流监测系统概述

介绍了城市轨道交通工程中杂散电流不同的监测系统的构成,分析了集中式、分散式和智能型等监测系统的配置和功能,以及智能型实时在线监测系统的重要意义,为轨道交通工程杂散电流监测系统的选择与应用提供参考。     

实现多组态计量软件集中监控的可行性分析

天然气自动计量系统有多种组态软件,由于软件的不相通性,造成了计量系统数据采集的通用性差、数据传输与入库的时效性差、数据利用的可靠性低.结合各组态软件的实际情况,从设计上充分利用Oracle大数据处理能力以及Partition(分区表)的特性,实现历史数据的存储,应用WebService与COM+数据访问组件提供多层数据访问架构,采用OPC与DDE工业数据交换协议,实现了各站场计量数据的实时上传,为连续数据采集和实时监控提供了可能,节约了改造成本.     

注汽管道承压能力评估和实物试验验证

基于失效评估图技术对某注汽管道进行了承压能力评价,给出了管线在不同腐蚀壁厚情况下的极限承压能力和极限裂纹尺寸。并利用实物爆破试验验证了评价方法的安全性和有效性,通过对爆破断口进行宏观和微观分析,发现管段的开裂属于脆性开裂。     

Non-parametric analyses of efficiency of airports

This paper estimates the efficiencies and productivity changes of 12 international airports in the Asia-Pacific region based on data from 1998 to 2006. We apply stochastic frontier analysis (SFA) to compute efficiency estimates and use the Malmquist productivity index (MPI) to analyze productivity changes. We use the SFA model with a translog-type production function after testing the statistical hypotheses. According to the results of the SFA hypothesis tests, airports have experienced a technological regression; the deviations from the efficiency frontier are caused more by technical inefficiency than random noise. However, the inefficiency was found to decrease. The MPI reveals a declining trend resulting more from technological change than from efficiency change, with a decrease in inefficiency. Taken together, both the hypothesis tests and the MPI not only provide consistent conclusions, but also suggest that airports should concentrate on technological progress.     

波纹管应力分析研究进展

评述了波纹管应力理论研究方法的进展情况，围绕解析法、工程近似法和数值法，对波纹管理论研究中的一些主要成果作了较详细的回顾和总结，对各种研究方法作出了评价，展望了亟待解决的一些问题。     

Direct analysis of the perceived importance of attributes of reliability of travel modes in urban travel

Reliability of travel modes was found to be the most important characteristic of transportation systems in several attitudinal investigations of individual travel behavior. This paper represents the first part of a research effort aimed at gaining a better understanding of the characteristics of reliability of transportation modes in urban travel. In this research, reliability characteristics are identified; their importance relative to each other is assessed, and an insight into possible structure of an objective reliability index is discussed. The research is based on perceived values of reliability, which were identified through a large attitudinal survey conducted in the Chicago metropolitan area.