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Impacts of Down-Up Hill Segment on the threshold of Shock Formation of Ring Road Vehicular Flow

Advances in Applied Mathematics and Mechanics 2023年第5期15卷 1315-1334页

作者： Zejing Hu M.N.Smirnova N.N.Smirnov Yongliang Zhang Zuojin Zhu Faculty of Engineering Science University of Science and Technology of ChinaHefeiAnhui 230026China Faculty of Mechanics and Mathematics Lomonosov Moscow State UniversityMoscow119992Russia Anhui Xiang Shui Jian Pumped Storage Co. LTDWuhuAnhui 241083China

The study of impacts of down-up hill road segment on the density threshold of traffic shock formation in ring road vehicular flow is helpful to the deep understanding of sags’bottleneck *** are freeway segments along which the gradient increases gradually in the traffic *** main aim of this paper is to seek the density threshold of shock formation of vehicular flow in ring road with down-up hill segment,because down-up hill roadway segment is a source to cause capacity reduction that is an attractive topic in vehicular traffic *** seek the density threshold numerically,a viscoelastic continuum model[1]is extended and *** solve the model equations,a fifth-order weighted essentially non-oscillatory scheme for spatial discretization,and a 3rd order Runge-Kutta scheme for time partial derivative term are *** by existing observation data and the Navier-Stokes like model[2]extended as EZM is done before conducting extensive numerical *** ring road vehicular flow with three separated down-up hill segments,it is found that the density threshold of shock formation decreases monotonically with the relative difference of free flow speed,this variation can be simply fitted by a third order polynomial.

关键词： Down-up hill road segment viscoelastic continuum model sags’bottleneck effect density threshold WENO5 scheme

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Divertor detachment operation in helium plasmas with ITER-like tungsten divertor in EAST

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Plasma Science and Technology 2022年第7期24卷 112-118页

作者：刘建斌孟令义郭后扬李克栋许吉禅汪惠乾徐国盛丁芳张凌段艳敏张斌余林汪平李昂吴东贵丁锐王亮 Institute of Plasma Physics HFIPSChinese Academy of SciencesHefei 230031People's Republic of China University of Science and Technology of China Hefei 230026People's Republic of China School of Mechanical Engineering Anhui University of Science&TechnologyHuainan 232001People's Republic of China General Atomics San DiegoCalifornia 92186United States of America Institute of Energy Hefei Comprehensive National Science CentreHefei 230031People's Republic of China

Detachment in helium(He)discharges has been achieved in the EAST superconducting tokamak equipped with an ITER-like tungsten *** paper presents the experimental observations of divertor detachment achieved by increasing the plasma density in He *** density ramp-up,the particle flux shows a clear rollover,while the electron temperature around the outer strike point is decreasing *** divertor detachment also exhibits a significant difference from that observed in comparable deuterium(D)*** density threshold of detachment in the He plasma is higher than that in the D plasma for the same heating power,and increases with the heating ***,detachment assisted with neon(Ne)seeding was also performed in L-and H-mode plasmas,pointing to the direction for reducing the density threshold of detachment in He ***,excessive Ne seeding causes confinement degradation during the divertor detachment *** precise feedback control of impurity seeding will be performed in EAST to improve the compatibility of core plasma performance with divertor detachment for future high heating power operations.

关键词： divertor detachment helium plasma density threshold EAST

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Tunnel effects on ring road traffic flow based on an urgent-gentle class traffic model

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Theoretical & Applied Mechanics Letters 2021年第4期11卷 230-235页

作者： Yongliang Zhang M.N.Smirnova Jian Ma N.N.Smirnov Zuojin Zhu Faculty of Engineering Science University of Science and Technology of ChinaHefei 230026China Faculty of Mechanics and Mathematics Lomonosov Moscow State UniversityMoscow 119992Russian Federation Moscow Center for Fundamental and Applied Mathematics Moscow 119992Russian Federation Scientific Research Institute for System Analysis Russian Academy of SciencesMoscow 119992Russian Federation Naval Architecture and Civil Engineering Jiangsu University of Science and TechnologyZhenjiang 215600China

To explore tunnel effects on ring road traffic flow,a macroscopic urgent-gentle class traffic model is put *** model identifies vehicles with urgent and gentle classes,chooses the tunnel speed limit as free flow speed to express the fundamental diagram in the tunnel,and adopts algebraic expressions to describe traffic pressure and sound *** two speed trajectories at the Kobotoke tunnel in Japan,the model is validated,with good agreement with observed *** results indicate that in the case of having no ramp effects,tunnel mean travel time is almost constant dependent on tunnel *** initial density normalized by jam density is above a threshold of about 0.21,a traffic shock wave originates at the tunnel entrance and propagates *** a threshold drops slightly as a result of on-ramp merging effect,the mean travel time drops as off-ramp diversion effect intensifies *** findings deepen the understanding of tunnel effects on traffic flow in reality.

关键词： Tunnel effects Travel time density threshold Ramp effects

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A GRID-BASED CLUSTERING ALGORITHM WITH REFERENTIAL VALUE OF PARAMETERS

A GRID-BASED CLUSTERING ALGORITHM WITH REFERENTIAL VALUE OF ...

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2007中国宁波国际计算机科学与技术学术大会

作者： Zhou Yantao Yi Xingdong Wu Zhengguo School of Computer & Communication Hunan University Information & Electrical Engineering College Naval Engineering University

By means of calculating density threshold data,some effective referential values of parameters were worked out and provided for users,and a new kind of clustering algorithm called GRPC was *** the help of these referential values of parameters,we can not only cluster general data but also segregate high-density clusters from low-density *** problem of lower quality of clusters in traditional grid clustering algorithm which usually ignored the distribution of data when meshing was *** results indicated that this new algorithm can differentiate between outliers or noises and clusters effectively and treat clusters of arbitrary *** new algorithm also displayed a good clustering quality.

关键词： Grid density threshold Clustering algorithm Data mining

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