It is shown that R&D activity has high concentricity in distribution.This paper deals with the measure of the concentricity.Some measuring indicators and method have been presented, which are very usefull in calcu...It is shown that R&D activity has high concentricity in distribution.This paper deals with the measure of the concentricity.Some measuring indicators and method have been presented, which are very usefull in calculating Lorenz curve, GINI index and other measuring indicators according to the logarithm mean square of distribution of S&T activity σ=D ln ξ. Finally,some examples are used to illustrate the applications and the validity of new method of the paper.It is shown that science and technology indicators reflecting system scale obey the lognormal distribution so that the results of this paper have practical values.展开更多
城市公共交通发展有利于交通结构优化调整,缓解城市交通拥堵状况。由于国内城市电动公交车运营线路选择和替换常规公交线路都是尝试阶段,缺少理论和方法分析。北京市在奥运会启用了电动公交车,为北京市绿色公交出行,减少能耗和碳排放提...城市公共交通发展有利于交通结构优化调整,缓解城市交通拥堵状况。由于国内城市电动公交车运营线路选择和替换常规公交线路都是尝试阶段,缺少理论和方法分析。北京市在奥运会启用了电动公交车,为北京市绿色公交出行,减少能耗和碳排放提供了很好的示范。本文结合纯电动公交车的运营技术条件和充电站的主要指标,给出北京市纯电动公交车开行条件和充电站备用电池等关键参数的适宜范围,为城市电动公交线开行方案和运营调度提供参考和借鉴,为绿色公交建设、公交结构和运营管理上提出建议。>Urban public transport development is conducive to the traffic structure optimization adjustment and relieves urban traffic congestion. As domestic electric city buses operating routes choice and replace con- ventional bus lines are in initial stage, it lacks theory and method of analysis. The electric bus opening in the Olympic Games in Beijing provides a good demonstration of green Beijing transit mode, reducing energy consumption and carbon emissions. The suitable scope of spare battery charging station and other key para- meters are given based on Beijing electric bus operation technical conditions and main index of the charging station. These results provide reference for the electric bus lines scheduling operations, but also for the con- struction of green bus, bus structure and operations management recommendations.展开更多
文摘It is shown that R&D activity has high concentricity in distribution.This paper deals with the measure of the concentricity.Some measuring indicators and method have been presented, which are very usefull in calculating Lorenz curve, GINI index and other measuring indicators according to the logarithm mean square of distribution of S&T activity σ=D ln ξ. Finally,some examples are used to illustrate the applications and the validity of new method of the paper.It is shown that science and technology indicators reflecting system scale obey the lognormal distribution so that the results of this paper have practical values.
文摘城市公共交通发展有利于交通结构优化调整,缓解城市交通拥堵状况。由于国内城市电动公交车运营线路选择和替换常规公交线路都是尝试阶段,缺少理论和方法分析。北京市在奥运会启用了电动公交车,为北京市绿色公交出行,减少能耗和碳排放提供了很好的示范。本文结合纯电动公交车的运营技术条件和充电站的主要指标,给出北京市纯电动公交车开行条件和充电站备用电池等关键参数的适宜范围,为城市电动公交线开行方案和运营调度提供参考和借鉴,为绿色公交建设、公交结构和运营管理上提出建议。>Urban public transport development is conducive to the traffic structure optimization adjustment and relieves urban traffic congestion. As domestic electric city buses operating routes choice and replace con- ventional bus lines are in initial stage, it lacks theory and method of analysis. The electric bus opening in the Olympic Games in Beijing provides a good demonstration of green Beijing transit mode, reducing energy consumption and carbon emissions. The suitable scope of spare battery charging station and other key para- meters are given based on Beijing electric bus operation technical conditions and main index of the charging station. These results provide reference for the electric bus lines scheduling operations, but also for the con- struction of green bus, bus structure and operations management recommendations.
