To make the large-scale helium cryogenic system of fusion device EAST （experimen- tal advanced super-conducting tokamak） run stably, as the core part, the helium turbine expander must meet the requirement of refrige...To make the large-scale helium cryogenic system of fusion device EAST （experimen- tal advanced super-conducting tokamak） run stably, as the core part, the helium turbine expander must meet the requirement of refrigeration capacity. However, previous designs were based on one dimension flow to determine the average fluid parameters and geometric parameters of impeller cross-sections, so that it could not describe real physical processes in the internal flow of the tur- bine expander. Therefore, based on the inverse proposition of streamline curvature method in the context of quasi-three-dimensional flows, the all-over-controlled vortex concept was adopted to design the impeller under specified condition. The wrap angle of the impeller blade and the whole flow distribution on the meridian plane were obtained; meanwhile the performance of the designed impeller was analyzed. Thus a new design method is proposed here for the inverse proposition of the helium turbine expander impeller.展开更多
传统广播与新媒体的融合,提升了广播媒体的传播力和影响力,在更好地满足受众需求的同时,带来了较大的经济效益。广播融媒直播系统基于全媒体设计,搭建了内容生产、发布和融合信号汇聚的全网际互连协议(Internet Protocol,IP)技术平台,...传统广播与新媒体的融合,提升了广播媒体的传播力和影响力,在更好地满足受众需求的同时,带来了较大的经济效益。广播融媒直播系统基于全媒体设计,搭建了内容生产、发布和融合信号汇聚的全网际互连协议(Internet Protocol,IP)技术平台,依托“云+端”前后期一体化制播方案,打通了全媒体生产各流程的物理壁垒,将广播、视频直播、点播发布等各种传播形态进行深度融合,打造多元化跨界联动广播的新格局。文章主要介绍重庆广播电视集团(总台)实施的广播融媒直播及总控系统,以展示网际互联协议化音频(Audio over Internet Protocol,AoIP)和云技术在广播融媒直播系统的应用实践。展开更多
探讨了光互联网的支撑技术和演进策略,分析了IP over DWDM等关键支撑技术的难点与发展趋势。首先,比较分析了若干种典型的网络层次模型及其性能,指出IP over DWDM是实现未来宽带互联网的关键支撑技术;其次,分析了IP over DWDM的技术难点...探讨了光互联网的支撑技术和演进策略,分析了IP over DWDM等关键支撑技术的难点与发展趋势。首先,比较分析了若干种典型的网络层次模型及其性能,指出IP over DWDM是实现未来宽带互联网的关键支撑技术;其次,分析了IP over DWDM的技术难点,指出全光信号处理和多协议标签交换技术是实现IP over DWDM的重要手段,并预言了在相关技术成熟后,光分组网技术将进一步推动光互联网的发展。展开更多
文摘To make the large-scale helium cryogenic system of fusion device EAST （experimen- tal advanced super-conducting tokamak） run stably, as the core part, the helium turbine expander must meet the requirement of refrigeration capacity. However, previous designs were based on one dimension flow to determine the average fluid parameters and geometric parameters of impeller cross-sections, so that it could not describe real physical processes in the internal flow of the tur- bine expander. Therefore, based on the inverse proposition of streamline curvature method in the context of quasi-three-dimensional flows, the all-over-controlled vortex concept was adopted to design the impeller under specified condition. The wrap angle of the impeller blade and the whole flow distribution on the meridian plane were obtained; meanwhile the performance of the designed impeller was analyzed. Thus a new design method is proposed here for the inverse proposition of the helium turbine expander impeller.
文摘传统广播与新媒体的融合,提升了广播媒体的传播力和影响力,在更好地满足受众需求的同时,带来了较大的经济效益。广播融媒直播系统基于全媒体设计,搭建了内容生产、发布和融合信号汇聚的全网际互连协议(Internet Protocol,IP)技术平台,依托“云+端”前后期一体化制播方案,打通了全媒体生产各流程的物理壁垒,将广播、视频直播、点播发布等各种传播形态进行深度融合,打造多元化跨界联动广播的新格局。文章主要介绍重庆广播电视集团(总台)实施的广播融媒直播及总控系统,以展示网际互联协议化音频(Audio over Internet Protocol,AoIP)和云技术在广播融媒直播系统的应用实践。
文摘探讨了光互联网的支撑技术和演进策略,分析了IP over DWDM等关键支撑技术的难点与发展趋势。首先,比较分析了若干种典型的网络层次模型及其性能,指出IP over DWDM是实现未来宽带互联网的关键支撑技术;其次,分析了IP over DWDM的技术难点,指出全光信号处理和多协议标签交换技术是实现IP over DWDM的重要手段,并预言了在相关技术成熟后,光分组网技术将进一步推动光互联网的发展。
