GPS在长大隧道控制测量中的应用

简述了长大隧道GPS测量的特点,结合白石河二号隧道工程GPS洞外控制测量工程实践,总结了GPS在长大隧道控制测量中的实际应用.     

地铁站施工单侧三角钢桁架模板设计与应用

根据谭鑫培地铁站侧墙单侧支模采用可拼装三角钢桁架模板的工程实例,讲述了方案优点,并在保证结构强度和刚度的前提下对三角钢桁架模板进行了最优化设计,减小了结构重量,使结构受力明确,安拆方便,既能保证混凝土外观质量,又能提升施工进度。     

青霉素有效成份检测技术分析

文章分析了青霉素结合蛋白的测定技术。     

Wear resistance of ceramic coating on AZ91 magnesium alloy by micro-arc oxidation

The ceramic coating formed on AZ91 magnesium alloy by micro-arc oxidation （MAO） was characterized. The results show that the ceramic coating （3.4-23 μm in thickness）on the surface ofAZ91 alloy was attained under different micro-arc oxidation treatment conditions, which consist mainly of MgO, Mg2SiO4 and MgSiO3 phases. Nano-hardness in a cross-sectional specimen was determined by nano-indentation experiment. The MAO coatings exhibit higher hardness than the substrate. Dry sliding wear tests for the MAO coatings and AZ91 alloy were also carded out using an oscillating friction and wear tester in a ball-on-disc contact configuration. The wear resistance of the MAO coatings is improved respectively under different treatment time as a result of different structures of ceramic coatings formed on AZ91 alloy.     

25MN双动反向挤压机工具套制造工艺的改进(续)

指出反向挤压机工具套传统加工工艺流程存在的问题,提出新的加工工艺.生产实践表明,采用新工艺加工工具套,精度高,质量好,节约钢材,提高了生产效率,减轻了劳动强度.     

基于DAB技术的智能交通车载终端

基于数字音频广播(DAB)技术,文章提出了一种交通诱导信息广播系统和一种车载智能终端。交通诱导信息广播系统将高速发展的广播数字化技术与城市交通智能管理相结合,是集信息采编、信息发布、信息移动接收、交通实时导航、娱乐于一体的信息处理平台;车载智能终端基于DAB技术,是用于对车辆现代化管理的设备。交通诱导信息广播系统依托移动网络可以从服务车辆上获得全球定位系统(GPS)定位信息,从而监控和跟踪车辆;车载智能终端可以接收DAB信道的实时广播、动态路况、车辆的导航路径等信息。