摘要：在五四青年节前夕,本刊举办了创刊周年座谈会.座谈会由编辑部主任杨涧华主持.黄志坚主编首先介绍了创刊一年来的概况.参加座谈会的有关领导、思想教育研究中心研究报告员、青年研究的专家学者和作者读者代表,就本刊的现状与未来、青年思想教育与青年研究等有关问题,发表了颇有见地的见解,现按发言顺序摘要发表.发言内容根据录音及书面发言稿整理,标题为编者所加.

摘要：In this paper, a numerical simulation of the traditional graded distributed Bragg reflector (DBR) and a design of the novel DBR with short period superlattices (SPSs DBR) used by vertical cavity surface emitting laser (VCSEL) are reported. First, the optical characteristic matrix of the graded DBRs is derived using the theories of thin film optics. Second, its reflective spectrum is numerical simulated and it is found that the simulative results are similar with the experimental data. The difference of the cavity mode position between the experimental and simulative data is discussed. Finally, based on the simulative results of graded DBR, a novel DBR with 4.5-pair GaAs/AlAs SPSs is designed, and its reflective spectrum is numerical simulated and analyzed.

摘要：建筑行业常常使用起升机送一些予制板、车辆砂石等建筑材料，在运行过程中会出现平台突然下落的工况，当使用抱闸瞬时将其刹住时，制动轮会因受力过大而碎裂以致碎块飞出伤人。这里仅从强度、刚度校校角度进行一些分析，供设备设计制造和使用单位参考。已知条件：（1）闸?..

摘要：本文介绍了在高速公路隧道监控系统——交通控制子系统与本地控制器子系统工作原理,详细阐述了这两个系统衔接过程中的控制与采集电路,提出了PLC采集交通指示灯假状态的设计隐患,并针对性的提出了解决方案。