Urban air pollution: state of the science

Urban air pollution is comprised of a highly complex mixture of gaseous and particulate components. Much progress has been made in our understanding of the detailed chemistry and physics of air pollution, but important areas of uncertainty still remain.     

Machine learning for science: state of the art and future prospects

Recent advances in machine learning methods, along with successful applications across a wide variety of fields such as planetary science and bioinformatics, promise powerful new tools for practicing scientists. This viewpoint highlights some useful characteristics of modern machine learning methods and their relevance to scientific applications. We conclude with some speculations on near-term progress and promising directions.     

狭义电子商务与广义电子商务

狭义电子商务仅实现网上商品交易信息化，而广义电子商务则是建立在信息技术上的现代商业方法，电子商务又分为初，中，高3个层次，和企业内联网，内联网与因特网连接，以及电子商务软件系统3个部分，并分别阐述了狭义电子商务和广义电子商务的组织与基本流程。     

电子商务与物流

电子商务和物流作为现代流通的两大手段,相互之间有着密切的联系.文章介绍了电子商务与物流的相互作用和相互影响,分析了两者之间的关系.