交通系统仿真技术及在道路工程中的应用

交通系统仿真正逐步在城市道路及公路的规划和设计中得到应用。该文首先对交通系统仿真的主要研究内容、应用、分类、功能及相关的交通系统仿真软件进行了总体介绍;在此基础上,利用宏观仿真软件VISSUM对上海市临港新城芦潮港社区D3路的交通量进行了预测,其预测成果已被应用于D3路的设计。     

天津临港工业港区吞吐量水平和船型预测

临港工业型港区与一般商港的不同之处在于港区的直接经济腹地是临港工业区,港区主要服务于临港工业区内部企业在建设和运营期间的原材料、产成品和其他货物的运输,其中部分码头泊位也提供对外商业中转运输服务.针对天津临港工业区内企业的发展需求,重点研究临港工业港区的货物种类、流量和流向的发展趋势,预测未来几年港区的到港船型和吞吐量...     

压水堆冷却剂系统协调控制方法研究

从大系统协调控制原理出发,总结已有研究成果,提出稳压器压力及主冷却剂泵转速的协调控制方法,即把负荷变化信号引入原来的控制系统,认为把协调控制方法应用到核动力装置各个系统的协调控制之中有很好的前景.     

An empirical analysis on the arterial fundamental diagram

For uninterrupted traffic flow, it is well-known that the fundamental diagram (FD) describes the relationship between traffic flow and density under steady state. For interrupted traffic flow on a signalized road, it has been recognized that the arterial fundamental diagram (AFD) is significantly affected by signal operations. But little research up to date has discussed in detail how signal operations impact the AFD. In this paper, based upon empirical observations from high-resolution event-based traffic signal data collected from a major arterial in the Twin Cities area, we study the impacts of g/C ratio, signal coordination, and turning movements on the cycle-based AFD, which describes the relationship between traffic flow and occupancy in a signal cycle. By microscopically investigating individual vehicle trajectories from event-based data, we demonstrate that not only g/C ratio constrains the capacity of a signalized approach, poor signal coordination and turning movements from upstream intersections also have significant impact on the capacity. We show that an arterial link may not be congested even with high occupancy values. Such high values could result from queue build-up during red light that occupies the detector, i.e. the Queue-Over-Detector (QOD) phenomenon discussed in this paper. More importantly, by removing the impact of QOD, a stable form of AFD is revealed, and one can use that to identify three different regimes including under-saturation, saturation, and over-saturation with queue spillovers. We believe the stable form of AFD is of great importance for traffic signal control because of its ability to identify traffic states on a signal link.     

连霍高速公路哈密—吐鲁番区间防风技术研究

在沿线风害成因、分布特征、基本风速对比分析研究基础上,确定连霍高速百里风区防风区段和防风标准,提出高速公路强横风路段采用柔性防风阻沙栅的防风措施,对于今后我国高速公路风害防控技术研究和高速公路安全、高效行车具有一定的指导意义和科学借鉴作用。     

城市轨道交通与常规公交衔接研究

明确轨道交通与常规公交衔接的必要性,从衔接布局、换乘能力及运营系统衔接方面进行分析,概要提出一体化衔接体系。研究证明,只有将轨道交通与常规交通合理衔接,才能实现城市公交系统的效益最大化。     

Dispatch coordination between high-speed and conventional rail systems

Cross-line trains,as a link between high-speed and conventional rail networks,will increase the complexity of transport organization and lead to significant challenges in dispatch coordination between the two systems.Based on the characteristics of high-speed transport organization,this paper deals with the necessity of dispatch coordination between high-speed and conventional lines from the following two perspectives:the operation of cross-line trains and work coordination in connection stations.An adjustm...     

建设生机勃勃的校园——关于构建和谐校园的思考

构建和谐校园是实现学校各种力量的平衡,是各种关系的协调,是推动学校持续、健康发展的需要。本文认为可以通过加强校园道德文化建设;完善学校各项规章制度;妥善协调校园中的各种关系;寻找学校主要矛盾与尖锐问题,积极解决问题,疏通障碍等方法和途径来构建和谐校园。     

基于工作过程系统化的水手工艺课程设计

本文借鉴工作过程系统化的先进理念,结合当前高职教育发展趋势和水手工艺课程特点,基于水手职业资格研究,以水手工艺中的维修保养为例进行了课程设计,并进一步提出了实施教学的要点。     

污水厂污泥产率随季节变化研究

污泥产量可根据经验污泥产率和污水处理量测算,但由于进水水质变化,运行控制不同,同一污水厂的污泥产率会因季节更迭而有所不同.通过对杭州市四座典型污水处理厂的调研研究,先分析了污泥产率随季节变化的规律,然后从进水COD浓度、SS浓度以及运行水温三个角度深入探究了污泥产率的具体影响因素,结果表明:各污水厂春季污泥产率高于其他...