摘要：A convenient,expeditious,and high-efficiency protocol for the transformation of alcohols into esters using a Co-modified N-doped mesoporous carbon material（Co-N/m-C）as the catalyst is *** catalyst was prepared through direct pyrolysis of a macromolecular *** catalyst prepared using a pyrolysis temperature of 900°C（labeled Co-N/m-C-900） exhibited the best *** strong coordination between the ultra-dispersed cobalt species and the pyridine nitrogen as well as the large area of the mesoporous surface resulted in a high turnover frequencymethyl *** value is much higher than those of state-of-the-art transition-metal-based nanocatalysts reported in the ***,the catalyst exhibited general applicability to various structurally diverse alcohols,including benzylic,allylic,and heterocyclic alcohols,achieving the target esters in high *** addition,a preliminary evaluation revealed that Co-N/m-C-900 can be used six times without significant activity *** general,the process was rapid,simple,and cost-effective.

摘要：设计制备了GaSb基I型InGaAsSb量子阱激光器,其激射波长为2。75μm。五元势垒材料AlGaInAsSb有效降低了势垒的价带能级并提高了价带带阶,使量子阱发光波长红移至2。75μm波段。通过优化分子束外延生长参数,得到了高发光效率的量子阱激光器外延材料,在此基础上设计并制备了腔长为1。5 mm、脊宽为50μm、中心波长为2。75μm的法布里-珀罗腔结构的激光器;所设计激光器可以实现室温连续激射,其最大输出功率为60 mW,阈值电流密度为533 A·cm^-2。