Technical efficiency of automobiles – A nonparametric approach incorporating carbon dioxide emissions

We conduct an empirical analysis of the technical efficiency of cars sold 2010 in Germany. The analysis is performed using traditional data envelopment analysis (DEA) as well as directional distance functions (DDF). The approach of DDF allows incorporating the reduction of carbon dioxide emissions as an environmental goal in the efficiency analysis. A frontier separation approach is used to gain deeper insight for diesel and gasoline cars. Natural gas driven cars and sport utility vehicles are also treated as different groups. The results show that the efficiency measurement is statistically yet not economically significantly influenced by the incorporation of carbon dioxide emissions. Moreover, we find that natural gas driven cars are highly inefficient even if the reduction of emissions is accounted for in the analysis.     

浅谈AB PLC数据交换技术应用

文章针对白车身焊装车间工艺复杂、控制系统布局分散、PLC系统之间通讯需求大等问题,在焊装车间原有设备的基础上,利用PLC数据交换技术,建立PLC控制系统之间远程数据通信功能,实现车间各区域联动生产,提高生产效率.     

我国汽车材料发展的几点史实和车辆用材的某些考虑

本文回顾了我国汽车工业发展简史和用料总量。回顾了国际封锁禁运下,我国如何自力更生地开发适合我国资源条件的汽车合金钢系列和低合金高强度钢板系列,节约了镍铬;并论证大量生产的大件商品——汽车必须考虑节约稀缺资源。关于汽车构造基体金属的探讨,突出了现代铸铁的技术进步;对铝、镁、钛用于汽年的前景也作了思考。本文最后讨论非金属材料中的木材、竹材和塑料,提出金属与非金属材料的最佳组合将对今后的汽车作出贡献,孕育出一代代的新型汽车。     

未来汽车材料和我国新材料研究课题

本文分析了世界汽车材料最近的发展动向,研讨了未来对汽车材料的新要求。针对我国发展轿车工业的需要,提出了我国汽车材料在若干重要领域亟待加强研究的某些新课题。