A facile catalysis-free method was utilized to synthesize functional neodymium hexaboride （NdB6 ） nanowires of single crystal using Nd powders and BCl 3 as starting materials. The XRD pattern confirmed that a single...A facile catalysis-free method was utilized to synthesize functional neodymium hexaboride （NdB6 ） nanowires of single crystal using Nd powders and BCl 3 as starting materials. The XRD pattern confirmed that a single phase NdB 6 could be obtained. Raman-spectra elucidated the active vibrational modes of the hexaborides. The TEM images clearly showed that the hexaborides were submicron in size with a cubic morphology. The field emission of these one-dimensional NdB6 nanowires showed a low field emission turn-on （5.55 V/μm at a current density of 10 μA/cm2 ）, and high current density with a field enhancement factor of 1037. The emission current density and the electric field followed the Fowler-Nordheim （F-N） relationship. The good performance for field emission was attributed to the single-crystalline structure and the nanowire geometry.展开更多
NDB设备机房对温湿度等环境要求十分严格,温度湿度等环境的变化可能引发NDB设备的不正常工作,严重时甚至会造成NDB设备受损,带来巨大经济财产损失。可见,保持机房内适宜的温湿度环境对NDB设备的安全可靠运行十分必要。本文从硬件和软件...NDB设备机房对温湿度等环境要求十分严格,温度湿度等环境的变化可能引发NDB设备的不正常工作,严重时甚至会造成NDB设备受损,带来巨大经济财产损失。可见,保持机房内适宜的温湿度环境对NDB设备的安全可靠运行十分必要。本文从硬件和软件两个方面设计了基于CAN(Controller Area Network,控制器局域网)总线技术的NDB设备机房温湿度监控系统。展开更多
基金Project supported by National Natural Science Foundation of China(50972046,51172077)Guangdong Provincial Department of Science and Technology(S2011020000521)
文摘A facile catalysis-free method was utilized to synthesize functional neodymium hexaboride （NdB6 ） nanowires of single crystal using Nd powders and BCl 3 as starting materials. The XRD pattern confirmed that a single phase NdB 6 could be obtained. Raman-spectra elucidated the active vibrational modes of the hexaborides. The TEM images clearly showed that the hexaborides were submicron in size with a cubic morphology. The field emission of these one-dimensional NdB6 nanowires showed a low field emission turn-on （5.55 V/μm at a current density of 10 μA/cm2 ）, and high current density with a field enhancement factor of 1037. The emission current density and the electric field followed the Fowler-Nordheim （F-N） relationship. The good performance for field emission was attributed to the single-crystalline structure and the nanowire geometry.
文摘NDB设备机房对温湿度等环境要求十分严格,温度湿度等环境的变化可能引发NDB设备的不正常工作,严重时甚至会造成NDB设备受损,带来巨大经济财产损失。可见,保持机房内适宜的温湿度环境对NDB设备的安全可靠运行十分必要。本文从硬件和软件两个方面设计了基于CAN(Controller Area Network,控制器局域网)总线技术的NDB设备机房温湿度监控系统。
