路段修缮对城市道路网络运行效率的影响

城市路网路段修缮对路网运行造成重大影响。从对出行者通行时间影响的角度入手,结合交通均衡分配原则,提出路段修缮下用户出行时间损失指数,来度量路段修缮对路网运行效率的影响,给出路段修缮损失指数的算法。选取商州区局部城市路网,分别计算修缮路段彻底中断和单向通行时的路段修缮损失指数,进而对比说明不同情况下路段修缮对路网运行效率的不同影响。     

挑战—创新—产业——王笑京谈中国智能交通发展路径

<正>突破信息提取计算、信息安全与可信认证、公路大尺度预报预警、不停车收费等关键技术,形成具有自主知识产权的中国标准与工程规范,在我国高速公路由路段管理向大规模路网管理转变中,他是革命者和改革者。冰冻雨雪灾害、汶川玉树地震、舟曲特大泥石流……覆盖30个省市和近40万公里公路网的国家公路网管理与应急处置平台体系,成为支撑我国公路网有效监管与应急处置的交通信息     

基于动态仿真与路网优化的疏散区域确定方法（英文）

在确定的突发事件危险区域与疏散需求基础上,提出了基于动态仿真与路网优化的疏散区域确定方法.该方法包含3个模块:运用车道反向设置与消除交叉口冲突综合策略,对疏散区域内的路网进行优化;应用基于元胞传输模型的动态疏散仿真模型,对待疏散车辆在疏散区域内路网上的动态运行状况进行模拟,获取临界交叉口车辆到达的估计值和待疏散车辆离开危险区域的时间,并对当前疏散区域范围的设置进行反馈;基于疏散车辆到达临界交叉口的状况,计算临界交叉口延误,并将其作为该交叉口是否仍旧为下一次迭代的临界交叉口的判定值.通过迭代,疏散区域范围逐渐扩大,最终确定合理的疏散区域与区域内的路网优化方案.应用上述模型与迭代算法,基于南京奥体中心周边停车设施、道路网络分布与道路基础设施现状调查,获取疏散状况下的疏散区域与路网重构方案,验证了所提方法的有效性.     

基于碳排放的城市干道信号协调控制

以福州市仓山区金山大道上3个重要节点为研究对象,以碳排放和路段总延误为评价指标,应用Synchro交通仿真软件进行信号协调控制优化设计,实现了交叉口碳排放最小的交通管理策略。研究结果表明:信号协调控制比现状单点信号控制方案的碳排放和路网总延误分别减少了9.6%和13.5%。可见,干道信号协调控制能有效减少碳排放,并提高交通流的运行效率。     

分形法在河北省高速公路规划中的应用

本文从分形及分形维数的概念入手 ,阐述了分形法用于公路网络评价的可能性 ,然后用分形理论提出的分形维数评价河北省规划高速公路网建设规模 ,由此可知 ,分形分维用于路网评价 ,既能反映以往公路网密度指标的特征 ,又能够反映公路网络分布的均匀度 ,具有更强的描述力     

教学楼火灾安全疏散预测模型研究

为了计算教学楼在人流高峰发生火灾时,人员是否能在规程规定的时间内完成疏散,本文应用人员疏散优化网络模型,确定区域节点、水平通道节点、90度弯道节点、三岔路口节点、十字路口节点、逃生出口节点以及楼梯节点的疏散时间计算方法,建立教学楼式建筑火灾人员安全疏散预测模型,用于教学楼性能化的防火设计和事故预防。     

教学楼火灾场景人员疏散仿真研究

基于性能化防火设计的研究思路,以A教学楼为例,讨论了教学楼现有疏散设施是否符合火灾场景下人员疏散要求。运用火灾模拟软件PyroSim建立火灾模型,得出影响疏散的温度、能见度、烟气的运动规律,选取最不利因素,确定可用安全疏散时间（ASET）。通过人员疏散软件Pathfinder模拟人员疏散路径,得出所需安全疏散时间（RSET）。研究结果表明,PyroSim与Pathfinder能有效的模拟火灾下人员疏散规律,A教学楼不能满足疏散要求,并提出改进方案以确保疏散安全。     

大型体育场性能化人员疏散设计分析

本文以某大型体育场为研究对象,针对罩棚下空间及首层内环道的疏散安全性进行了研究,采用性能化疏散设计方法计算不同设定场景下的可用安全疏散时间和必需安全疏散时间,并通过比较二者的大小来评估人员疏散的安全性及疏散设计的合理性。结果表明,在采取相应加强措施的条件下,疏散设计能够保证人员疏散的安全性。     

地震时人口疏散模型研究

阐述了人口疏散模型对减小地震期间人员伤亡和财产损失的作用。从疏散空间、单元格边长及邻域等方面对人口疏散模型进行了描述。以人口疏散模型为基础,通过C语言进行编程并对人口疏散过程和疏散时间进行了仿真。     

考虑公交站点可达性的郊区出行方式选择

为了分析站点的公交可达性对郊区居民出行方式选择的影响,采用居民出行OD点可达范围内的站点线路数和平均等待时间作为站点可达性指标.基于出行时间与可达范围的相关性,将站点可达性构造为受出行时间约束的分段变量.以中国厦门市集关区为例,建立了包含站点可达性指标的郊区出行方式选择的二元logistic回归模型.结果 表明,站点可...     

卡思卡特城堡

It is worthy of noting that, whilst Crookston Castle witnessed the earlier and happier portion of Mary's variegated life,     

不同的吃喝玩乐

一、吃和喝吃苹果 eat an apple, 吃药 take medicine,吃糖 have some sweets,吃饭 have one's meals,吃馆子 dine out,吃惊 be surprised/     

漏洞百出的教育

Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help?     

只要努力,不要后悔

There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love.     

浅谈移民问题

Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject.     

Sister Carrie, an Adherent of Desires

Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities.     

Improvement of one-cycle controller by use of proportional integral differential controller

1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec…     

库克斯顿城堡

城堡, 是欧洲典型的建筑之一, 每个城堡都有一个美丽的传说或是一段历史。从本期开始, 我们将推出“城堡之旅”, 带各位读者去浏览、观赏欧洲各地的城堡, 开始一段文化与历史的旅途!     

胡主席在印度,我却在中国

Today, Sunday morning, I sit thinking and typing at my computer. My thoughts are in my homeland, India and my body is in China. The body is here and mind there for a good reason. Mr. Hu is president and I am resident and both are in each other's countries (what a difference the absence of one small letter makes!). Mr. Hu will return in a few days and I will stay on longer.