Blue-Green Electroluminescence of Free-Standing Diamond Thin Films

Blue-green electroluminescence has been observed in free-standing diamond films which were deposited by microwave plasma assisted CVD on silicon substrates.The electroluminescence device is driven by a 60 Hz power supply.The threshold voltage was about 112 V peak-to-peak.The electroluminescence spectrum at room temperature,showed a blue-green band with the peak centered at 485nm suggesting band A type emission.Electroluminescence was also observed at 77K.

农村生活垃圾分类模式探讨

中国已经开展生活垃圾分类试点多年,虽然垃圾分类工作取得了一定的进展,但与垃圾回收、垃圾处理处置等环节衔接不够,未发挥其应有的成效。随着乡村振兴战略的实施,加快补齐农村垃圾治理短板将是重点工作之一,农村生活垃圾分类模式对于调动各参与方的积极性将至关重要。通过分析农村生活垃圾特点,对比多地的生活垃圾分类回收现状,提出现阶段中国农村地区生活垃圾分类回收存在的问题,并得出分类回收模式应侧重的方向,为优化农村生活垃圾回收体系提供有益启示。