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Traffic flows controlled by traffic light strategies were investigated via a cellular automaton model with anticipation, which is suitable for describing urban traffic. Three kinds of strategies, i. e., synchronized, green-wave and random switching lights, were designed, simulated and compared with each other. It is shown that the green-wave strategy is only valid at lower density and there is not an effective way with the three strategies to improve the efficiency of traffic flow at high density. 相似文献
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2010年7月30日清晨6月20分,中国近代力学奠基人之一、著名力学家、应用数学家、教育家钱伟长院士辞世,享年98岁。钱三强,钱学森,钱伟长,被周恩来总理称为中国科技界“三钱”。随着钱伟长先生离世,“三钱”的最后一位也离开了我们。中国科技界正面临一个大师凋零的年代。 相似文献
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戴世强 《重庆第二师范学院学报》2011,(7):58-59
我们知道，做学问是一种创造性劳动，必须创造性地投入，否则，很难成功。关于科学创造，我已陆续发表了一些见解。近日读到我国现代教育家陶行知先生《创造宣言》，深受启发，在此推介给青年朋友们。 相似文献
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戴世强 《学位与研究生教育》1999,(5):19-21
作为研究生导师,肩负着培养新一代高级科技人才的重任,应该怎样不负党和人民所托,出色地完成这一使命？我想从如下几个角度谈一些体会。 一、 着想点———当好铺路石子著名作家赵长天最近写道：“每个人,在他的人生旅途中,总有几个重要的,起关键作用的,永远也不该忘记的人。……”。要是有人问我,谁对我的一生起关键作用？我会毫不犹豫地回答：郭永怀教授和钱伟长教授。我在人生旅途上,得到两位著名学者的指引,实在是我的幸运。十年前,我在纪念导师郭永怀教授逝世２０周年的短文“当好铺路石子”中写道：“郭永怀教授离开我… 相似文献
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1 Introduction Inhomogenetiesintrafficrefertothosefactorsre sultingfromthechangeintrafficflowvolumes ,suchasthechangeinthenumberoflanes ,thedegradationofroads,andthedisturbanceatazebracrossingoratollstation ,etc .Theconsiderationoftheinhomo geneitiesgivesrisetospatiallyvaryingfluxintrafficcontinuummodels ,whichareusuallynon strictlyhy perbolicandhavenotbeenwellunderstoodmathemat ically .Therelatedstudiesinliteraturewerefewandthebehaviorandtheinfluenceoftheseinhomo geneitieswerenotclearenough… 相似文献
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The normal impingement process of two water droplets upon a thin film on the solid surface was numerically investigated. The numerical treatment was based on the finite volume solution of the Navier-Stokes （N-S） equations combined with the volume of fluid method （VOF）. Physically reasonable results for the process of two droplets impacting on the thin film were obtained. The effects of the droplet velocity, the fihn thickness and the spacing between the two droplets on the splash and spread process of the impact were examined. 相似文献
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一种改进的交通流元胞自动机模型 总被引：1，自引：0，他引：1
A modified cellular automaton model for traffic flow was proposed. A novel concept about the changeable security gap was introduced and a parameter related to the variable security gap was determined. The fundamental diagram obtained by simulation shows that the maximum flow more approaches to the observed data than that of the NaSch model, indicating that the presented model is more reasonable and realistic. 相似文献
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1Introduction Recently,more attention has been paid to urbantraffic,especially the traffic flow controlled by trafficlights.Traffic light control strategy is crucial for i m-proving the efficiency of urbantransportation network.The cellular automaton(CA)m… 相似文献
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