上海外环线浦东段(二期)沥青面层技术要点

该文对上海城市外环线浦东段 (二期 )工程沥青面层技术做了简要的介绍 ,提出了施工过程中重点考虑的因素。     

公路特大型泥石流研究及防治新理念

作为我国一种严重的公路水毁类型，公路特大型泥石流灾害至今尚未解决，本文建构了该类泥石流研究及防治新理念，对于公路建筑物的安全与稳定、确保公路交通有序进行具有重要意义。研究认为，公路泥石流研究及防治的主要对象是具有大冲大淤性能、毁损作用强烈的特大型泥石流；必须遵循以泥石流发育机理研究为基础、防治技术研究为手段、防治工程研究为目的的研究原则；详细分析了公路泥石流水毁模式，概化分析了冲淤变动型沟谷泥石流的发育特性；开发了防治效果极佳的速流结构，运用运动状态函数法建构了速流结构设计理念，运用动力学建构了泥石流最大抛程计算理论。     

喷射混凝土在隧道支护中的应用

根据隧道合同段的具体实际情况及施工工艺,通过合理选择喷射混凝土的原材料,精确的配合比设计,正确选择喷射机械和工艺流程,严格控制喷射施工质量,使喷射混凝土作为围岩开挖后的主要支护构件,达到设计的作用效果.     

间歇式沥青拌和站冷料供给系统流量的标定方法

以实例介绍间歇式沥青拌和冷料供给系统流量的标定方法和步骤，以确保冷料供给器按目标配合比准确供料，使沥青混合料的生产配比更加接近目标配比，保证拌和成品料的质量。     

二灰碎石组成设计与施工工艺的优化

从施工角度就改进和优化现有二灰碎石混合料级配组成设计和传统的施工工艺提出了几点建议,推荐集料级配范围和4阶段碾压模式.对二灰碎石基层施工具有积极的指导意义.     

配比设计与级配调试现场速解方法研究

应用EXCEL电子图表的数据处理功能，研究了混合料配比设计与级配调试的速解途径。结合混合料配比设计与料场管理的现实特点，发现借助多元最小二乘法拟合原理，由电算程序求解超静定线性方程组，不仅可以快速准确地完成配比设计，而且可以随配比调节同步显示出级配变化。结果表明电子图表既可作为配比设计模版，又可现场预知级配调控结果，是拌和场消除成品料级配废料的一种便捷手段。     

Socially optimal electric driving range of plug-in hybrid electric vehicles

This study determines the optimal electric driving range of plug-in hybrid electric vehicles (PHEVs) that minimizes the daily cost borne by the society when using this technology. An optimization framework is developed and applied to datasets representing the US market. Results indicate that the optimal range is 16 miles with an average social cost of $3.19 per day when exclusively charging at home, compared to $3.27 per day of driving a conventional vehicle. The optimal range is found to be sensitive to the cost of battery packs and the price of gasoline. When workplace charging is available, the optimal electric driving range surprisingly increases from 16 to 22 miles, as larger batteries would allow drivers to better take advantage of the charging opportunities to achieve longer electrified travel distances, yielding social cost savings. If workplace charging is available, the optimal density is to deploy a workplace charger for every 3.66 vehicles. Moreover, the diversification of the battery size, i.e., introducing a pair and triple of electric driving ranges to the market, could further decrease the average societal cost per PHEV by 7.45% and 11.5% respectively.     

基于层次分析法的区间估计的车站能力查定误差因子分析研究

本文归纳总结了车站能力查定计算过程中存在的多种影响因素,深入分析了其产生原因和不可避免性。然后利用层次分析法的区间估计方法计算得出各种误差因子对计算结果的影响权重大小,并对比不同误差因子的权重区间,筛选出强误差因子,剔除弱误差因子,为精确计算车站能力值提供依据。     

大极差情况下载荷试验承载力取值计算

对于载荷试验的大极差,各种规范没有给出统一的规定,试验数据的处理比较随便,造成不经济或不安全。当极差大于30%平均值或最大值与最小值之比大于1.3时,承载力取值可采用离群值剔除法、变异系数折减法确定。案例计算分析表明,给出的计算公式合理、计算简单方便,可用于各种载荷试验确定承载力。     

Instantaneous communication throughputs of vehicular ad hoc networks

Vehicular ad hoc networks (VANETs) formed by connected vehicles in a traffic stream could be applied to improve safety, mobility, and environmental impacts of a transportation system. In this paper, we present analytical models for the instantaneous communication throughputs of VANETs to measure the efficiency of information propagation under various traffic conditions at a time instant. In particular, we define broadcast and unicast communication throughputs by the wireless channel bandwith multiplied by the average probabilities that one vehicle is a successful receiver and sender in a VAENT, respectively. With a protocol communication model, we derive formulas to determine the probabilities for an equipped vehicle to be a successful broadcast receiver and a successful unicast receiver/sender, and obtain broadcast and unicast throughputs along discrete and continuous traffic streams. We further examine the impacts on communication throughputs of the transmission range and the interference range of dedicated short range communication devices as well as the market penetration rate of equipped vehicles and the percentage of senders. Finally, we investigate the influence of shock waves on communication throughputs.