城市公路网交通信息平台规划研究

为了更好地管理和利用城市公路管理部门的信息资源，本文提出建设城市公路网交通信息平台。以总体框架为指导，设计了信息平台的逻辑结构和拓扑结构。根据用户主体的不同，将信息服务分为共享服务和增值服务两种类型，明确了信息平台的主要数据信息流。以面向企事业单位和社会公众提供信息增值服务为重点，进行了信息要素分析和服务方式分析，规划了公路网交通信息服务系统的发展模式。     

公路台背填筑材料性能研究

为研究不同种台背填筑材料的性质，对素土、混合料稳定土、砂砾石进行多种试验研究，对试验结果进行比较分析，总结出不同台背填筑材料的优缺点，从而为高速公路三羞台背填筑材料的选择提供依据和参考。     

Intelligent drug delivery system using UML diagrams analysis

A novel intelligent drug delivery system potential for the more effective therapy of the diabeticswas proposed, and the composition of system was analyzed. Based on the design of micro-electro-mechanicalsystems (MEMS), an iterative modeling process was introduced. Unified modeling language (UML) was em-ployed to describe the function requirement, and different diagrams were built up to explore the static model,the dynamic model and the employment model. The mapping analysis of different diagrams can simply verifythe consistency and completeness of the system model.     

铁路站场BIM技术应用研究

BIM技术应用是一次设计手段的变革,站场专业是铁路工程中的龙头专业,是BIM技术应用的重点专业,站场设计的效率和质量对整个铁路的建设和运营具有极其重要的影响。论述站场专业BIM技术应用现状。以站场专业利用BIM技术作为设计手段为目的,从设计软件、标准、基础数据和交付平台等方面对站场专业BIM技术应用提出解决对策;提出站场BIM设计软件研发的两种方法。以铁路工程信息模型分类和编码标准为基础对站场IFD标准进行扩充和完善,以站场和航测专业的数据接口为例对站场设计从二维到三维转变时的接口数据适应性调整进行说明。通过对站场设备添加可定位的身份编码,在自主研发的BIM综合管理平台上构建铁路站场专业三维信息模型组织结构树。     

Carbon and energy footprints of electric delivery trucks: A hybrid multi-regional input-output life cycle assessment

Due to frequent stop-and-go operation and long idling periods when driving in congested urban areas, the electrification of commercial delivery trucks has become an interesting topic nationwide. In this study, environmental impacts of various alternative delivery trucks including battery electric, diesel, diesel-electric hybrid, and compressed natural gas trucks are analyzed. A novel life cycle assessment method, an environmentally-extended multi-region input-output analysis, is utilized to calculate energy and carbon footprints throughout the supply chain of alternative delivery trucks. The uncertainties due to fuel consumption or other key parameter variations in real life, data ranges are taken into consideration using a Monte Carlo simulation. Furthermore, variations in regional electricity mix greenhouse gas emission are also considered to present a region-specific assessment for each vehicle type. According to the analysis results, although the battery electric delivery trucks have zero tailpipe emission, electric trucks are not expected to have lower environmental impacts compared to other alternatives. On average, the electric trucks have slightly more greenhouse emissions and energy consumption than those of other trucks. The regional analysis also indicates that the percentage of cleaner power sources in the electricity mix plays an important role in the life cycle greenhouse gas emission impacts of electric trucks.     

地铁屏蔽门便携测试仪实现方案初探

通过分析西门子屏蔽门控制子系统工作原理和控制信号波形,探讨采用TMS320DM6437数字信号处理器和高速ADC/DAC实现地铁屏蔽门便携测试仪的实现方案。     

基于站群控制的城市轨道交通站台紧急停车系统

针对我国城市轨道交通运营的特点,基于站群控制的管理理念,重新对城市轨道交通站台紧急停车系统进行方案设计。以一个卫星站和一个轴心站为例,把站群管理模式应用到了站台紧急停车系统中,减少了卫星站信号系统工作人员配置数量,提高了站台区运营管理效率,对今后国内城市轨道交通工程项目的建设和运营管理具有指导和参考意义。     

Road pricing: some further comments

This paper extends the discussion of certain problems associated with road pricing raised in an earlier contribution to this journal. Firstly it is shown that where the value of time varies between different groups of traffic using the same congested road, optimal road pricing requires price discrimination between the groups such that those with the lowest value of time pay the highest charge and suffer the greatest losses. However, a uniform price based on an “equity” value of time would reduce the relative distributional effects. Secondly the paper takes up the suggestion that queueing (and by extension congestion) may be positively helpful in the allocation of resources and shows that this is not in general correct although there are situations in which the use of queueing alongside conventional pricing may have a role to play. Finally it is argued that governments’ apparent lack of enthusiasm for road pricing stems as much from political considerations as the more technical problems of applying it.     

复合地层泥水盾构环流关键参数选择探析

为研究复合地层泥水盾构泥水环流参数选择的问题,结合狮子洋隧道盾构工程,采用泥浆临界沉淀流速计算方法计算软弱地层和软硬不均地层所需的泥浆送、排量,并运用费祥俊模型试验公式进行验算。由于复合地层地质条件的复杂性,泥水盾构环流参数的影响因素较多,结合以上计算结果分析不同地层特性对泥浆送、排量的影响。研究结果表明： 1）2种方法的泥浆送、排量计算结果相差不大,证明泥浆临界沉淀流速计算方法具有准确性和合理性; 2）在软硬不均地层进行泥水盾构施工时,应加大泥浆送、排量,以减少输送颗粒在排浆管内滑移、平动,同时减少舱内积碴和泥浆管的磨损。研究结果可为复合地层下的泥水盾构施工提供参考。     

飞来峡二、三线相互灌泄水船闸省水特性及效益分析

为缓解通航用水与发电、农业用水之间的矛盾,拟建的广东北江飞来峡二、三线船闸采用相互灌泄水的省水运行方式。对船闸建立水工物理模型研究其省水特性并进行效益分析,对比双线相互灌泄水的省水运行方式与单线运行方式的优劣。研究结果表明:省水运行模式每年省水2.89亿~3.77亿m3,折合水能发电量0.135亿~0.175亿k W·h;省水船闸闸室及引航道水流条件、船舶停泊条件优于单线运行模式;船闸通过能力满足通航需求。省水船闸运行具有显著的经济效益和环境效益。