本文讲述4K/8K超高清(Ultra High Definition,UHD)视频的信息特征、对无线传输网络的要求,重点论述5G移动通信网的突出特性和对4K/8K超高清视频的承载能力,介绍中央广播电视总台超高清播出的基础架构、管理系统、音视频系统构建,以及在5...本文讲述4K/8K超高清(Ultra High Definition,UHD)视频的信息特征、对无线传输网络的要求,重点论述5G移动通信网的突出特性和对4K/8K超高清视频的承载能力,介绍中央广播电视总台超高清播出的基础架构、管理系统、音视频系统构建,以及在5G+4K+AI建设、制播、新媒体融合方面的发展情况。展开更多
Graphene-like MoS2 has attracted significant interest because of its unique electronic, optical, and catalytic properties with two-dimensional lamellar structure. Three kinds of intercalated MoS2 samples were prepared...Graphene-like MoS2 has attracted significant interest because of its unique electronic, optical, and catalytic properties with two-dimensional lamellar structure. Three kinds of intercalated MoS2 samples were prepared using different oxidation layering methods, which are the first steps of intercalation-detonation. The oxidation layering mechanism of graphene-like MoS2 was systematically characterized using Fourier transform infrared, X-ray photoelectron, and Raman spectroscopy techniques. The bulk MoS2 sample was gradually oxidized from the edge to the interlayer in the presence of concentrated H2SO4 and KMnO4. A large number of hydroxyl groups were bonded to the sulfur atom layer, forming S-OH bonds in the basal planes of the MoS2 structure. The addition of deionized water to concentrated H2SO4 generated a large amount of heat, promoting the generation of more S-OH bonds, destroying residual Van der Waals forces between the layers, and finally stripping off parts of the flakes. The continuous addition of deionized water in the high temperature stage resulted in the largest oxidative intercalation effect. Additional136 the I/factor was determined to compare the intensities of Blu and Alg peaks in the Raman spectra and quantify the effect of oxidative intercalation. The highest value of q was obtained when deionized water was added continuously during the preparation of intercalated MoS2.展开更多
文摘本文讲述4K/8K超高清(Ultra High Definition,UHD)视频的信息特征、对无线传输网络的要求,重点论述5G移动通信网的突出特性和对4K/8K超高清视频的承载能力,介绍中央广播电视总台超高清播出的基础架构、管理系统、音视频系统构建,以及在5G+4K+AI建设、制播、新媒体融合方面的发展情况。
文摘Graphene-like MoS2 has attracted significant interest because of its unique electronic, optical, and catalytic properties with two-dimensional lamellar structure. Three kinds of intercalated MoS2 samples were prepared using different oxidation layering methods, which are the first steps of intercalation-detonation. The oxidation layering mechanism of graphene-like MoS2 was systematically characterized using Fourier transform infrared, X-ray photoelectron, and Raman spectroscopy techniques. The bulk MoS2 sample was gradually oxidized from the edge to the interlayer in the presence of concentrated H2SO4 and KMnO4. A large number of hydroxyl groups were bonded to the sulfur atom layer, forming S-OH bonds in the basal planes of the MoS2 structure. The addition of deionized water to concentrated H2SO4 generated a large amount of heat, promoting the generation of more S-OH bonds, destroying residual Van der Waals forces between the layers, and finally stripping off parts of the flakes. The continuous addition of deionized water in the high temperature stage resulted in the largest oxidative intercalation effect. Additional136 the I/factor was determined to compare the intensities of Blu and Alg peaks in the Raman spectra and quantify the effect of oxidative intercalation. The highest value of q was obtained when deionized water was added continuously during the preparation of intercalated MoS2.
