为适应1394B总线在航空领域的应用,SAE对IEEE1394B协议进行改进,从而满足了航空领域的高可靠、低延迟、确定性、完整性的要求[1]。原有飞管和机电系统使用NDB子卡作为1394B网络中的RN节点,现在此基础上增加一路CCDL(Cross-Channel Data ...为适应1394B总线在航空领域的应用,SAE对IEEE1394B协议进行改进,从而满足了航空领域的高可靠、低延迟、确定性、完整性的要求[1]。原有飞管和机电系统使用NDB子卡作为1394B网络中的RN节点,现在此基础上增加一路CCDL(Cross-Channel Data Link)通讯接口,用于在各机电设备之间进行信息传输。该设计在不改变原有1394总线网络架构的情况下,增加一路内总线来提高机电系统信息的传输效率与传输可靠性,对机载总线网络的发展具有重要的意义。展开更多
This paper presents a photonic crystal(PhC)line-defect slow-light waveguide modified by resonant rings.We introduce resonant rings into the line defect,constructing a slow-light waveguide with high normalized delay ba...This paper presents a photonic crystal(PhC)line-defect slow-light waveguide modified by resonant rings.We introduce resonant rings into the line defect,constructing a slow-light waveguide with high normalized delay bandwidth product(NDBP)and low group velocity dispersion(GVD).We simulate,analyze,and optimize the structural parameters of this slow-light waveguide using the finite difference time domain(FDTD)method,theoretically achieving a maximum group index of 3.7,maximum bandwidth of 15.6 nm,and maximum NDBP of 0.4416 for slow-light effect.The resonant ring-modified PhC slow-light waveguide designed in this paper exhibits GVD lower than the order of 10^(−20)s^(2)/m over a normalized frequency range from 0.3554 to 0.4175.This study is expected to provide theoretical references for the study of slow-light buffering devices based on PhCs with high NDBP values.展开更多
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
文摘为适应1394B总线在航空领域的应用,SAE对IEEE1394B协议进行改进,从而满足了航空领域的高可靠、低延迟、确定性、完整性的要求[1]。原有飞管和机电系统使用NDB子卡作为1394B网络中的RN节点,现在此基础上增加一路CCDL(Cross-Channel Data Link)通讯接口,用于在各机电设备之间进行信息传输。该设计在不改变原有1394总线网络架构的情况下,增加一路内总线来提高机电系统信息的传输效率与传输可靠性,对机载总线网络的发展具有重要的意义。
基金supported by the Graduate Student Innovation Fund of Xi’an Shiyou University(No.YCS21211087).
文摘This paper presents a photonic crystal(PhC)line-defect slow-light waveguide modified by resonant rings.We introduce resonant rings into the line defect,constructing a slow-light waveguide with high normalized delay bandwidth product(NDBP)and low group velocity dispersion(GVD).We simulate,analyze,and optimize the structural parameters of this slow-light waveguide using the finite difference time domain(FDTD)method,theoretically achieving a maximum group index of 3.7,maximum bandwidth of 15.6 nm,and maximum NDBP of 0.4416 for slow-light effect.The resonant ring-modified PhC slow-light waveguide designed in this paper exhibits GVD lower than the order of 10^(−20)s^(2)/m over a normalized frequency range from 0.3554 to 0.4175.This study is expected to provide theoretical references for the study of slow-light buffering devices based on PhCs with high NDBP values.
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.
