宽体车车架结构分析与整车性能验证

本次研发的宽体车总质量为40t,是在总质量60t级平台产品的基础上向下衍生而来的。应用三维造型软件建立了矿用自卸车实体几何模型,并对关键结构——车架给出了应力分析时的模型简化方法,根据整车的装配关系和车架的受力特点确定了车架强度有限元分析的边界条件,在此基础上建立了包括车桥、悬挂和车厢在内的整车有限元模型,依据矿用车的典型受力重点选取满载静止或平稳行驶、扭转组合和侧倾举升作业作为分析工况,应用ANSYS软件求解得到各工况下车架的应力大小和应力分布规律。为验证整车的性能,在华润水泥南宁公司矿山对样车进行了为期3个月的性能试验,并对该矿车进行了全面检验,为下一步优化设计提供依据。     

Automatic extraction of 1D barcodes from video scans for drone-assisted inventory management in warehousing applications

The widespread use of barcodes has significantly contributed to accurate, efficient and economic inventory management in warehouses and distribution centres. However, its efficiency has always been limited by the primary method of reading barcodes with a handheld laser scanner. Compared with this reading by line-of-sight at close proximity, vision-based barcode reading algorithms can further improve efficiency, particularly if accompanied by automated data collection platforms such as drones. This paper introduces algorithms that are able to automatically extract barcodes from video data, and verifies their feasibility and promise for inventory management in warehousing applications. Three key techniques corresponding to different recognition levels are proposed: For a known barcode region, a Harris corner detector and Hough transform-based algorithm is applied to quickly estimate the angle by which the frame area needs to rotate to orient the bars vertically for information extraction. Then, the idea of exploiting connectivity and geometry property of barcode areas is proposed to directly recognise multiple barcode regions in a single video frame to eliminate reading difficulties resulting from interactive influence of multiple juxtaposed barcodes, and to save computation time by only processing frame areas of interest for valid barcodes. In addition, a histogram difference-based fast extraction strategy is designed to further improve efficiency by reducing duplicate information processing. Finally, the performance of each technique is evaluated by analysing video data from a large logistics warehouse, demonstrating satisfactory performance in inventory management applications.     

In and out of everyday life through film experiences: an analysis of two social spaces as leisure frames

The new information and communication technologies have made it possible to view films in different spaces. Using the symbolic interactionist framework as a frame of analysis, we interpret the meaning of the two experiences of viewing technology-mediated films in the home and in the cinema. We conducted field research during the first half of 2009, digitally recording 16 interviews with research participants living in Barcelona (Spain). The interviews were transcribed verbatim with the help of voice-recognition software. Reports from our research participants indicate that individuals considered only the cinema experience to be a true leisure activity, while the home experience was interpreted as a routine recreational activity. Therefore, the meanings of the film-viewing activity were associated with the symbolic properties of the frames of interpretation. Finally, we discuss the implications of these findings for the home as a unified centre where shared meanings are co-produced by family members.     

多跨连续-刚构桥梁施工的高程及应力控制——以新疆克其克苏布台大桥为例

为实现桥梁施工精度的准确控制,保证桥梁施工质量符合设计要求,对某多跨连续-刚构桥梁的施工控制进行了计算分析。首先,通过理论计算桥梁的预拱度,并在施工过程中采取相应的高程及应力控制措施;其次,通过现场实测,对施工过程中的高程及应力进行实时监测,将监测值与控制值进行比较,以评价控制效果。实例检验结果表明:在高程控制方面,最终合龙高程误差不超过8mm,满足了桥梁的线型要求;在应力控制方面,主梁和墩身应力均为压应力,且远小于规范限值,满足设计要求。因此,在桥梁施工过程中,通过理论计算与施工控制相结合的方法,能够实现桥梁高程及应力的有效控制,达到预期效果。桥梁施工控制措施的有效性在研究中得到了验证,可为类似桥梁施工提供参考。     

基于遥测信号的测距技术及其发展趋势

基于遥测信号的测距技术可以有效解决深空测距下行链路同时传输遥测、测距信号时出现的遥测数据传输速率受限、频谱带宽增加等问题,应用前景广阔。介绍了基于遥测信号的测距技术发展历程,重点总结了其中的关键技术,包括上行测距码的选择、遥测帧的设计和传输、PN码相位估计算法,最后探讨了其发展趋势。基于遥测信号的测距技术适应未来深空测距的发展需求,是深空测距的重要发展方向之一。     

某鱼腹式连续箱梁桥设计

文章介绍了山东邹城某预应力鱼腹式连续箱梁的设计理念、设计构思和结构分析,对今后鱼腹式连续箱梁的应用有一定的借鉴意义。     

新版标准图集、定额实施下框架柱钢筋设计与计算

本文以框架柱钢筋设计和工程量计算为例,介绍新版标准图集和定额的规则改变,旨在为今后建筑工程的设计和计算提供一些有价值的参考。     

连续刚构桥悬臂施工技术研究

本文给出了预应力混凝土连续刚构箱梁悬臂施工的工艺控制,并对施工中常出现的影响工程质量的一些问题作了深入细致的介绍和探讨。     

底部框架砌体房屋中现浇钢筋混凝土梁、板下沉的原因与防治

针对东北许多地区临街房屋底层所采用的框架建筑结构进行简要分析,并针对其存在的问题提出相应的解决措施。     

底部框架结构的设计要点

文章分析了底部框架结构的特点，介绍了底部框架结构设计的要点。