CCTV新址主楼钢结构防火涂料施工

CCTV新址主楼具有钢结构体量大、复杂节点多的特点,防火涂料施工为钢结构的重要工序,对主体结构抗火功能有关键作用.结合厚型防火涂料和超薄型防火涂料的主要性能,对结构各部位采用不同的涂装厚度,确定合适的施工工艺.分别介绍钢结构防火涂料的主要技术指标和施工过程;重点介绍F37底部钢结构、斜塔楼F37、F39及悬臂F39底部钢结构防火涂料施工.整个工程防火涂料施工经历了2年时间,未发现涂料脱落和裂纹.     

CCTV主楼悬臂部位大型塔式起重机安装技术

CCTV主楼塔楼双向倾斜,塔楼1、2分别安装1台M1280D和1台M600D动臂式塔式起重机,4台塔式起重机拆除难度大,需要先移装2台M600D塔式起重机至悬臂部位.重点介绍,M600D塔式起重机悬臂支撑没计以及附着设计和加工.指出可以通过对桁架增加立柱的方式对悬臂进行加固;另外,附着杆的增加可以降低起重机对下部悬臂桁架的不利荷载.最后介绍了悬臂部位M600D移位安装流程.     

CCTV主楼大型动臂式塔式起重机高空移位安装

CCTV主楼塔楼双向倾斜,悬臂结构悬挑距离长.施工过程中需将内爬塔式起重机多台次移位安装.从主体钢结构工程、压型钢板工程、混凝土工程、核心筒的加同支撑等方面介绍了塔式起重机高空移位工况.重点阐述了M1280D塔式起重机高空移位超重部件摆放和拆装顺序,以及超长起重臂高空摆放部位选择和安全措施.     

CCTV主楼大型空调箱隔振技术

CCTV新址主楼空调系统形式主要有全空气变风量系统和空气定风量系统.大楼内空调箱数量多,单台体型庞大.正确合理地选用隔振元件,并采用较优隔振形式,获得合理的隔振传递率和隔振效率,能有效地控制和降低空调箱的固体声传播,为大楼创造良好的建筑声学环境和室内声学条件.     

A Simplified Method for Making Accurately Etched Shapes in Molybdenum Foils by a Photo Sensitive Resist Technique

Photo etching is a convenient technique for fabricating small metal components, but normally expensive and complex equipment is needed. This report describes a simplified technique for making evaporation masks in molybdenum foil, using standard laboratory equipment of relatively low cost. When using 0.003 in. molybdenum results accurate to ±0.0005 in. (±3 per cent) have been achieved. Accuracy is dependent on a number of factors, which include the photography, the thickness and type of metal and the etching technique.     

利用视频监控系统调查放火案件

结合利用视频监控录像系统调查侦破的两起放火案件,简要介绍视频监控系统的原理、系统影像特征,以及利用系统侦破放火案件应注意的问题.     

基于DSP的手动机器人设计与实现

在CCTV举办的机器人比赛中，手动机器人的表现好坏非常关键。抽象三届比赛对手动机器人活动区域和完成任务的要求，可以把手动机器人的控制抽象为3个典型控制问题，针对这3个典型控制问题提出一种基于DSP的手动机器人设计方法，给出了具体的硬件和软件设计。     

大型复杂连体钢结构加工制作和安装综合技术

CCTV主楼为体型独特的复杂连接结构,构件加工制作和现场安装难度大,特别是主楼悬臂部分具有悬挑跨度大、重量重、双向倾斜高空折形对接、多接头异型构件多、安装风险大等施工特点,安装施工难度大。主要介绍CCTV主楼钢结构的施工详图设计、构件加工、悬臂现场安装及相关的结构控制技术。     

排水管道检测技术的发展现状

对地下管道进行经常性的检测是避免其发生事故的有效措施,为此详细介绍了管道检测技术的现状、发展趋势及相关技术在国内的应用情况,并对我国排水管道检测的管理提出了改进建议.     

Semi-automated CCTV surveillance: The effects of system confidence,system accuracy and task complexity on operator vigilance,reliance and workload

Recent advances in computer vision technology have lead to the development of various automatic surveillance systems, however their effectiveness is adversely affected by many factors and they are not completely reliable. This study investigated the potential of a semi-automated surveillance system to reduce CCTV operator workload in both detection and tracking activities. A further focus of interest was the degree of user reliance on the automated system. A simulated prototype was developed which mimicked an automated system that provided different levels of system confidence information. Dependent variable measures were taken for secondary task performance, reliance and subjective workload. When the automatic component of a semi-automatic CCTV surveillance system provided reliable system confidence information to operators, workload significantly decreased and spare mental capacity significantly increased. Providing feedback about system confidence and accuracy appears to be one important way of making the status of the automated component of the surveillance system more ‘visible’ to users and hence more effective to use.