铁路工程材料经济运距计算方法及分析

工程材料的运杂费是工程造价的重要组成部分,他由采用的运输工具和运输距离所决定。如何在所设材料供应点满足工程用料量要求,且价格相等、运输单价相等的情况下,使运距最为经济,此文对几种运距的计算进行推导与说明,并以某拟建工程为例进行计算与比较。结果显示,采用平均运距相等法得出的经济运距稍微偏大,采用线性规划法得出的经济运距稍微偏少,但相差不大。其后又对各自的适用条件和优缺点进行了对比,以期为工程建设管理提供参考。     

大瑞铁路长大隧道地热段技术经济研究

随着西部大开发战略的实施,在西部山区修建的铁路逐渐增多,建设中遇到的长大隧道也越来越多,还有地热高温隧道,其施工存在一定的难点.此文以大瑞铁路重点地热高温隧道为例,在阐述其工程特点和水文、地质情况的基础上,就如何采取地热降温措施进行探讨,并对施工的经济性进行分析,提出应增加的有关费用,确保隧道工程投资的准确性。     

工程项目经济活动分析存在的问题及对 策简

开展经济活动分析,是施工企业进行经济核算、正确评估施工生产和经营活动的重要工作内容之一,被广泛运用到工程项目管理中。此文针对工程项目部管理的特点,阐述开展项目经济活动分析存在的主要问题。通过分析,提出开展项目经济活动分析的基本原则和方法,应采取的对策和措施。     

《重庆交通学院学报》2003年六项文献计量指标及其排序

介绍了《中国学术期刊综合引证报告》(CAJ-CCR)的概况.按照载文量、总被引频次、影响因子、即年指标、被引半衰期和他引总引比等六项文献计量值的大小,列出了(CAJ-CCR 2004)中《重庆交通学院学报》(JCJU)和其它28种“交通航运”类高校学报的排序.不难看出,JCJU主要指标值的排序并不亚于某些同类学科中的重点大学的学报.     

Evaluation of the effect of cooperative infrastructure-to-vehicle systems on driver behavior

In-vehicle technologies and co-operative services have potential to ease congestion problems and improve traffic safety. This paper investigates the impact of infrastructure-to-vehicle co-operative systems, case of CO-OPerative SystEms for Intelligent Road Safety (COOPERS), on driver behavior. Thirty-five test drivers drove an instrumented vehicle, twice, with and without the system. Data related to driving behavior, physiological measurements, and user acceptance was collected. A macro-level approach was used to evaluate the potential impact of such systems on driver behavior and traffic safety. The results in terms of speeds, following gaps, and physiological measurements indicate a positive impact. Furthermore, drivers’ opinions show that the system is in general acceptable and useful.     

Intermodal route selection for cargo transportation from Korea to Central Asia by adopting Fuzzy Delphi and Fuzzy ELECTRE I methods

Due to the increase in trade from Korea to Central Asia, an efficient intermodal route for transporting cargo is important. Intermodal routing for long-distance transportation faces operational challenges, such as customs clearance, track gauge differences, and climate limitations. The initiative of the Silk Road Economic Belt recently proposed in China could improve trade and transport links in Asia and create an efficient transportation route that focuses on the railroad service provided in China. The objective of this study is to obtain an evaluation structure for intermodal routing and then find the route for transporting cargo from Korea to Central Asia under China’s Silk Road Economic Belt with integrated Fuzzy Delphi and Fuzzy (Elimination Et Choice Translating Reality (ELECTRE) I methods. After a sensitivity analysis is performed, development strategies and alternative routes are suggested. The results show that among the five principal factors, total cost is the most important factor for logistics companies when they select a transportation route, followed by reliability, transportation capability, total time, and security. Of the sub-factor weights, transportation costs and cooperation and emphasis among state organization are important. In the intermodal route results, route 3, Incheon to Qingdao to Horgos to Almaty, is preferred.     

Charging strategies for economic operations of electric vehicles in commercial applications

When substituting conventional with electric vehicles (EV) a high annual mileage is desirable from an environmental as well as an economic perspective. However, there are still significant technological limitations that need to be taken into consideration. This study presents and discusses five different charging strategies for two mobility applications executed during an early stage long-term field test from 2013 to 2015 in Germany, which main objective was to increase the utilization within the existing technological restrictions. During the field test seven EV drove more than 450,000 km. For four out of five presented charging strategies the inclusion of DC fast charging is indispensable. Based on the empirical evidence five key performance indicators (KPI) are developed. These indicators give recommendations to economically deploy EV in commercial fleets. The results demonstrate that the more predictable the underlying mobility demand and the more technical information is available the better the charging strategies can be defined. Furthermore, the results indicate that a prudent mix of conventional and DC fast charging allows a high annual mileage while at the same time limiting avoidable harmful effects on the battery.     

生物沥青调和沥青结合料与混合料性能指标的相关性分析

为探讨生物沥青调和沥青结合料与混合料性能指标之间的相关性,制备了掺量为0%、5%、10%、15%、20%的生物沥青调和沥青结合料和相应的AC-20C型沥青混合料,并进行了沥青结合料的常规性能试验、流变性能试验以及沥青混合料的高温性能试验、低温性能试验、力学性能试验。基于试验结果与数据分析,主要结论为:结合料与混合料高温性能指标之间基本上呈良好的线性相关性,但结合料的60℃黏度与混合料的高温性能指标之间不具有线性关系,而呈抛物线关系;结合料与混合料低温性能指标之间亦呈线性相关,但以延度作为生物沥青调和沥青低温性能评价指标的可行性有待进一步验证;与低温性能指标相比,结合料的针入度与混合料的高温性能指标之间的线性相关性更优,对于力学性能指标来说,针入度与抗压回弹模量之间线性相关性很好,而与劈裂强度之间则呈二次相关。     

城市轨道交通控制中心规划与设计的关键性指标研究

随着国内轨道交通的快速发展,更多城市轨道交通进入网络化运营时代,如何合理规划与设计网络化运营下的轨道交通控制中心,已成为各城市建设中亟需解决的课题。结合国内轨道交通规划与设计经验,提出控制中心关键的规划与设计相关的指标、方法,供轨道交通控制中心规划、工艺设计与建设的同行参考。     

公路运价在居民消费价格指数中表征的国内外对比分析

通过对比分析居民消费价格指数,在不同国家交通类指标的指标构成、权重及指数发展变化趋势的基础上,结合我国公路交通发展特点,分析公路运价在居民消费价格指数中表征的合理性,提出在消费价格指数中适时引入二手车和通行费消费种类,以便客观全面地反映交通消费对居民消费价格指数的影响作用。