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 effect.Sags are freeway segmen...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 effect.Sags are freeway segments along which the gradient increases gradually in the traffic direction.The 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 science.To seek the density threshold numerically,a viscoelastic continuum model[1]is extended and used.To 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 used.Validation by existing observation data and the Navier-Stokes like model[2]extended as EZM is done before conducting extensive numerical simulations.For 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.展开更多
目的基于五行理论探究中医五行人中火行人与水行人的认知功能及加工过程差异性,为进一步丰富中医五行人理论内涵、推进我国本土化人格理论模型提供基础。方法在招募的受试者中根据前期制订的《中医五行(形)人面部表型分类量化规范》筛...目的基于五行理论探究中医五行人中火行人与水行人的认知功能及加工过程差异性,为进一步丰富中医五行人理论内涵、推进我国本土化人格理论模型提供基础。方法在招募的受试者中根据前期制订的《中医五行(形)人面部表型分类量化规范》筛选出典型的火行人与水行人,采用成套重复性神经心理测查工具(Repeatable Battery for the Assessment of Neuropsychological Status,RBANS)和Top-down及Bottom-up认知心理测查范式对其认知功能进行测评。采用独立样本t检验对两组受试者的认知功能进行差异性分析。结果招募受试者火行人24人,水行人20人,与水行人组相比,火行人组在注意功能维度得分明显更高,在RBANS各部分得分上数字广度和编码测验任务得分更高;火行人组在Bottom-up认知心理测查范式的长时认知加工过程中的反应时更短、准确率更高,水行人在Bottom-up认知心理测查范式的短时加工准确率差值更低,差异均有统计学意义(P<0.05)。结论中医五行人中火行人更易高度集中注意力,更易被线索所吸引,但注意力的维持时间较短,同时水行人在注意力反应时间更长,更不易被线索所影响,且注意力稳定性更强。展开更多
目的基于现代心理学认知测查范式探讨中医五行人中木行人与金行人的认知功能及加工过程差异,为丰富中医五行人理论及中医心理学内涵提供基础。方法根据前期制订的《中医五行(形)人面部表型分类量化规范》,招募典型的木行人与金行人,采...目的基于现代心理学认知测查范式探讨中医五行人中木行人与金行人的认知功能及加工过程差异,为丰富中医五行人理论及中医心理学内涵提供基础。方法根据前期制订的《中医五行(形)人面部表型分类量化规范》,招募典型的木行人与金行人,采用重复性成套神经心理状态测验(Repeatable Battery for the Assessment of Neuropsychological Status,RBANS)、自上而下和自下而上线索化范式测评其认知功能及注意加工差异。采用独立样本t检验和秩和检验对两组受试者的认知功能进行差异性分析。结果共纳入受试者木行人32例、金行人40例。在RBANS中,与木行人相比,金行人视觉广度及其子任务线条定位得分更高(P<0.05);在自下而上线索化范式中,与金行人相比,木行人短时反应时差值更高,与木行人相比,金行人长时反应时差值更高,差异均有统计学意义(P<0.05)。结论中医五行人中木行人更依赖自下而上的认知加工方式,金行人更擅长处理视空间信息,更节约认知加工资源。展开更多
基金supported by National Natural Science Foundation of China(NSFC No.11972341)fundamental research project of Lomonosov Moscow State University’s Mathematical models for multi-phase media and wave processes in natural,technical and social systems.
文摘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 effect.Sags are freeway segments along which the gradient increases gradually in the traffic direction.The 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 science.To seek the density threshold numerically,a viscoelastic continuum model[1]is extended and used.To 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 used.Validation by existing observation data and the Navier-Stokes like model[2]extended as EZM is done before conducting extensive numerical simulations.For 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.
文摘目的基于五行理论探究中医五行人中火行人与水行人的认知功能及加工过程差异性,为进一步丰富中医五行人理论内涵、推进我国本土化人格理论模型提供基础。方法在招募的受试者中根据前期制订的《中医五行(形)人面部表型分类量化规范》筛选出典型的火行人与水行人,采用成套重复性神经心理测查工具(Repeatable Battery for the Assessment of Neuropsychological Status,RBANS)和Top-down及Bottom-up认知心理测查范式对其认知功能进行测评。采用独立样本t检验对两组受试者的认知功能进行差异性分析。结果招募受试者火行人24人,水行人20人,与水行人组相比,火行人组在注意功能维度得分明显更高,在RBANS各部分得分上数字广度和编码测验任务得分更高;火行人组在Bottom-up认知心理测查范式的长时认知加工过程中的反应时更短、准确率更高,水行人在Bottom-up认知心理测查范式的短时加工准确率差值更低,差异均有统计学意义(P<0.05)。结论中医五行人中火行人更易高度集中注意力,更易被线索所吸引,但注意力的维持时间较短,同时水行人在注意力反应时间更长,更不易被线索所影响,且注意力稳定性更强。
文摘目的基于现代心理学认知测查范式探讨中医五行人中木行人与金行人的认知功能及加工过程差异,为丰富中医五行人理论及中医心理学内涵提供基础。方法根据前期制订的《中医五行(形)人面部表型分类量化规范》,招募典型的木行人与金行人,采用重复性成套神经心理状态测验(Repeatable Battery for the Assessment of Neuropsychological Status,RBANS)、自上而下和自下而上线索化范式测评其认知功能及注意加工差异。采用独立样本t检验和秩和检验对两组受试者的认知功能进行差异性分析。结果共纳入受试者木行人32例、金行人40例。在RBANS中,与木行人相比,金行人视觉广度及其子任务线条定位得分更高(P<0.05);在自下而上线索化范式中,与金行人相比,木行人短时反应时差值更高,与木行人相比,金行人长时反应时差值更高,差异均有统计学意义(P<0.05)。结论中医五行人中木行人更依赖自下而上的认知加工方式,金行人更擅长处理视空间信息,更节约认知加工资源。
