DWDM(密集波分系统)作为目前大容量传输光网络,以其节省光缆资源和高速率多系统传送的特点,逐步被人们所认识和广泛应用。本文对DWDM系统的线路光功率衰减特点、倒换触发告警、倒换时间以及数据路由器HLOD OFF TIME参数设置等4个方面进...DWDM(密集波分系统)作为目前大容量传输光网络,以其节省光缆资源和高速率多系统传送的特点,逐步被人们所认识和广泛应用。本文对DWDM系统的线路光功率衰减特点、倒换触发告警、倒换时间以及数据路由器HLOD OFF TIME参数设置等4个方面进行深入研究,了解DWDM系统倒换机制与数据路由器参数设置的协调工作的特性,寻找DWDM系统承载数据GE业务的最佳参数设置,从而我们深入了解DWDM网的工作原理、保护和恢复机理等。通过分析济南联通现有DWDM网络所承载的数据业务类型、服务等级、设备现状以及相关实验测试,提出了DWDM系统和数据网路由器HLOD OFF TIME参数最佳的配置,并针对现有业务承载修改参数后的测试结果,提出最终研究结论。展开更多
A novel red-emitting K2（Ge,Si）F6：Mn^4＋ phosphor with uniform morphology was synthesized by co-precipitation method. The pure K2GeF6 phase with P63 mc space group other than P3m1 space group was affirmed just by in...A novel red-emitting K2（Ge,Si）F6：Mn^4＋ phosphor with uniform morphology was synthesized by co-precipitation method. The pure K2GeF6 phase with P63 mc space group other than P3m1 space group was affirmed just by incorporation of Si in K2GeF6 at room temperature according to XRD characterization. SEM images showed lamellar and octahedron grain morphology for K2GeF6：Mn^4＋ and K2（Ge,Si）F6：Mn^4＋ phosphors, respectively. It was also found that the photoluminescence excitation（PLE） and photoluminescence（PL） showed slight displacement in K2GeF6：Mn^4＋ and K2（Ge,Si）F6：Mn^4＋ system. And the zero-phonon line（ZPL） of the PL spectrum of K2GeF6：Mn^4＋ with Si showed a strong peak. Meanwhile crystalline field surrounding Mn^4＋ changes could affect the decay time in this fluoride system. The color gamut of the LED devices based on K2（Ge,Si）F6：Mn^4＋ and K2GeF6：Mn^4＋ reached up to 94.58% NTSC（National Television Standards Committee） and 94.386% NTSC, respectively, that was much higher than that based on nitride red phosphors. All these original characteristics in K2（Ge,Si）F6：Mn^4＋ phosphor are desirable for potential applications as a red phosphor for improving lighting and display quality of conventional white LEDs.展开更多
Linear Alkyl Benzene （LAB） is a promising liquid scintillator solvent in neutrino experiments because it has many appealing properties. The timing properties of LAB-based liquid scintillator have been studied throug...Linear Alkyl Benzene （LAB） is a promising liquid scintillator solvent in neutrino experiments because it has many appealing properties. The timing properties of LAB-based liquid scintillator have been studied through ultraviolet and ionization excitation in this study. The decay time of LAB, PPO and bis-MSB is found to be 48.6 ns, 1.55 ns and 1.5 ns, respectively. A model can describe the absorption and re-emission process between PPO and bis-MSB perfectly. The energy transfer time between LAB and PPO with different concentrations can be obtained via another model. We also show that the LAB-based liquid scintillator has good （n, γ） and （α, γ） discrimination power.展开更多
文摘随着计算机科学的发展,声学的可听化技术被越来越广泛地应用到主观实验研究中.声学软件ODEON可以建立很好的仿真声场,利用ODEON的可听化技术,对矩形高大空间和狭长空间的语言清晰度进行实验研究.结果表明,对于同一空间中的不同接收点的语言清晰度,早期衰变时间的影响比信噪比的影响显著;在语言清晰度为主要设计指标的厅堂中,应该主要控制早期衰变时间,使其不能超过1.5 s.
文摘DWDM(密集波分系统)作为目前大容量传输光网络,以其节省光缆资源和高速率多系统传送的特点,逐步被人们所认识和广泛应用。本文对DWDM系统的线路光功率衰减特点、倒换触发告警、倒换时间以及数据路由器HLOD OFF TIME参数设置等4个方面进行深入研究,了解DWDM系统倒换机制与数据路由器参数设置的协调工作的特性,寻找DWDM系统承载数据GE业务的最佳参数设置,从而我们深入了解DWDM网的工作原理、保护和恢复机理等。通过分析济南联通现有DWDM网络所承载的数据业务类型、服务等级、设备现状以及相关实验测试,提出了DWDM系统和数据网路由器HLOD OFF TIME参数最佳的配置,并针对现有业务承载修改参数后的测试结果,提出最终研究结论。
基金Project supported by the Major State Basic Research Development Program of China(National Basic Research Program of China)(2014CB643801973)
文摘A novel red-emitting K2（Ge,Si）F6：Mn^4＋ phosphor with uniform morphology was synthesized by co-precipitation method. The pure K2GeF6 phase with P63 mc space group other than P3m1 space group was affirmed just by incorporation of Si in K2GeF6 at room temperature according to XRD characterization. SEM images showed lamellar and octahedron grain morphology for K2GeF6：Mn^4＋ and K2（Ge,Si）F6：Mn^4＋ phosphors, respectively. It was also found that the photoluminescence excitation（PLE） and photoluminescence（PL） showed slight displacement in K2GeF6：Mn^4＋ and K2（Ge,Si）F6：Mn^4＋ system. And the zero-phonon line（ZPL） of the PL spectrum of K2GeF6：Mn^4＋ with Si showed a strong peak. Meanwhile crystalline field surrounding Mn^4＋ changes could affect the decay time in this fluoride system. The color gamut of the LED devices based on K2（Ge,Si）F6：Mn^4＋ and K2GeF6：Mn^4＋ reached up to 94.58% NTSC（National Television Standards Committee） and 94.386% NTSC, respectively, that was much higher than that based on nitride red phosphors. All these original characteristics in K2（Ge,Si）F6：Mn^4＋ phosphor are desirable for potential applications as a red phosphor for improving lighting and display quality of conventional white LEDs.
基金Supported by National Natural Science Foundation of China (10890094, 11011120080)
文摘Linear Alkyl Benzene （LAB） is a promising liquid scintillator solvent in neutrino experiments because it has many appealing properties. The timing properties of LAB-based liquid scintillator have been studied through ultraviolet and ionization excitation in this study. The decay time of LAB, PPO and bis-MSB is found to be 48.6 ns, 1.55 ns and 1.5 ns, respectively. A model can describe the absorption and re-emission process between PPO and bis-MSB perfectly. The energy transfer time between LAB and PPO with different concentrations can be obtained via another model. We also show that the LAB-based liquid scintillator has good （n, γ） and （α, γ） discrimination power.
