An updated model of atomic oxygen redline dayglow emission

A comprehensive model is developed using the updated rate coefficients and transition probabilities to study the redline dayglow emission of atomic oxygen. The solar EUV fluxes are obtained from the Solar Irradiance Platform (SIP), and incorporated into the model successfully. All possible production and loss mechanisms of O(¹D) are considered in the model. The neutral number densities and temperature are adopted from the NRLMSISE-00 model. The ion and electron densities, and electron temperature are adopted from the IRI-07 model. The model results are validated with the help of measurements as provided by the Wind Imaging Interferometer (WINDII) on board Upper Atmosphere Research Satellite (UARS). The present results are found in better agreement with the measurements in comparison with the earlier model. The measured volume emission rate profiles are reproduced quite well by the present model. The model results show that the updated rate coefficients and transition probabilities are quite consistent and may be used in the aeronomical studies.     

提升我国煤炭行业竞争力的有效途径——基于波特理论的视角

波特的国家竞争优势理论阐述了生产要素、国内需求、相关和支撑产业、企业战略结构和竞争四个要素,以及政府和机会两个辅助要素对国家竞争力的影响和它们之间的相互作用。我国是煤炭资源大国,但是在资源开发利用程度、运输条件、需求条件、产品结构、政府政策等方面还存在着很多问题,致使煤炭产业在世界市场上的竞争力不足,我们可以将波特理论应用于我国煤炭产业,从而寻求煤炭产业竞争力提升的途径,使资源优势更好地转变为竞争优势。