GaAs和GaAs/AlGaAs多层量子阱中载流子的超快动力学(英文)

The ultrafast photoexcited carrier dynamics in bulk GaAs and GaAs/ AlGaAs multiple quantum well(MQW)structure has been studied using femtosecond laser pulse pump-probe techniques on the samples grown by MBE. A hot carrier cooling time of 1.5ps in MQW is measured at room temperature. Also, optical phonon emission at 33meV is observed in this sample. These results are found to be similar to that observed in bulk GaAs. A comparison of the hot carrier cooling rates for the two cases suggests that the infra-sub-band optical phonon scattering in MQW may play a dominant role in the cooling of highly excited hot carriers for the narrow wells. The experimental results agree well with that predicted by a simple infinite depth square-well model.     

基于GPRS的低功耗输电线路覆冰翻转监测装置的设计与实现

输电线路覆冰后可能发生导线的翻转现象,从而造成线路的损伤。本文研究了基于GPRs通信技术的新型、低功耗的输电线路覆冰翻转监测装置。首先给出了监测装置的整体设计方案,然后给出了考虑低功耗要求的监控装置的硬件电路实现,并对其中的倾角传感器选型、GPRs通信模块的设计等关键环节进行了详细的介绍,最后讨论了软件的开发环境及程序的流程图。测试结果表明,该装置可以长时间、稳定的运行,准确地测量导线的翻转角度,满足设计精度要求。     

大学生长跑运动匀速跑耐力训练平台优化设计

为实现更加全面的动作姿态捕捉,设计了大学生长跑运动匀速跑耐力训练平台,平台的压力传感器为外型精巧的FSR402型压阻式传感器。通过匀速跑耐力训练软件模块实现以下功能：与硬件设备相配合采集长跑运动匀速跑耐力训练姿态数据;嵌入插件回放、展示匀速跑耐力训练的场景等。通过位姿修正模块能够实现人体运动姿态和骨骼位置修正,通过MySQL搭建数据库模块。平台性能测试结果表明该平台能够直观地获取教练与训练者关节角的运动轨迹对比情况,实现姿态相似度数据的捕捉。