动态测量系统中时间同步问题研究与实践

多传感器动态测量系统中时间严格同步是实现系统实时、准确获取空间目标位置、姿态等信息的关键。围绕解决传感器间数据同步问题,提出针对两台计算机的时间同步方案,制定传感器数据采集方案,提出相应的数据内插算法。综合测试结果表明,提出的方案及算法成功地解决了多传感器动态测量系统中的时间同步问题,系统综合测试精度优于0．05mm,远远高于0．465mm的设计指标。     

新型的自动标定器

介绍了一种新型的自动标定装置 ,阐述了簧板标定器的基本工作原理及其自动控制系统。该装置结构简单 ,可方便地组合成人工和自动标定器。给出了簧板标定器的初步测试结果 ,表明簧板标定器完全满足形变仪器的要求。     

安徽铜陵杨山冲浅层富硫化物尾矿中砷的赋存状态

含硫化物尾矿常常释放大量的酸性排水和重金属,污染地下水、地表水和土壤,破坏生态系统,因此日益成为人们关注的焦点。本文以安徽铜陵杨山冲尾矿库浅层富硫化物尾矿为研究对象,利用扫描电镜(SEM)、电子探针(EPMA)、粉末X射线衍射(XRD)、拉曼光谱(Raman)、光电子能谱(XPS)和同步辐射近边吸收精细结构谱(XANES)等方法,系统分析了尾矿中砷的赋存形式,发现尾矿中的砷有3种价态: As(-Ⅰ)、As(Ⅲ)、As(Ⅴ)。在风化较弱的下部尾矿中,砷以As(-Ⅰ)、As(Ⅲ)和As(Ⅴ)的形式赋存;而强烈风化的表层尾矿中只检测到As(Ⅴ)的存在。从下部到表层,从低价态的As(-Ⅰ)和As(Ⅲ)逐渐变为高价态的As(Ⅴ)。下部尾矿中的砷主要赋存于黄铁矿中,而表层尾矿中的砷主要赋存在铁的(氢)氧化物和硫酸盐中。     

Subjectivity,Power, and the IRB

A substantial literature in social sciences, including law and society, examines the intersections of research ethics and institutional review board (IRB) frameworks. Although geographers have engaged this literature, we argue that further involvement in ethical and regulatory discussions will advance opportunities for better understanding and negotiating the complex subjectivities produced in the IRB structure. Drawing on illustrative experiences of researchers, we focus specifically on the institutions convening IRBs, the researchers, and the human “subjects” produced in the IRB process. We conclude with a call for greater open discussion of the power dynamics, subjectivities, and challenges of formal ethical research structures.     

Analytical modeling of a diver dry suit enhanced with micro-encapsulated phase change materials

Over the years, various forms of phase change materials (PCMs) have been utilized as thermal storage mediums for cooling and heating applications. Recently, the U.S. Navy has investigated using phase change materials inside divers' dry suits to enhance thermal protection in extremely cold water applications. The thermal performance of optional types of insulative Comfortemp¹ foam mediums, medium thicknesses, and foam-to-Thermosorb² ratios are evaluated analytically in this paper to compare the relative thermal performances of PCM-enhanced dry suits with existing commercial dry suits. An analytical model of dry suit systems, both conventional and those containing Comfortemp materials, is developed to predict their thermal performances in simulated ocean environments. This analytical model is used to compare the relative thermal performances of PCM-enhanced dry suits with existing commercial dry suits, and to assess the relative thermal performances of candidate Comfortemp foams, including those interspersed with different weight percentages of micro-encapsulated PCMs, in an effort to maximize thermal storage capabilities. The observations from this modeling effort provides guidelines and recommendations for materials selection and thickness requirements for candidate Comfortemp foams to be used in prototype dry suits for divers.     

地下长距离废弃管道充填施工设计

阐述了某地下废弃管道的充填处置施工设计方案,为地下废弃管道处置项目的施工实践提供依据,并对以后类似长距离废弃地下空间的充填施工具有很好的借鉴意义     

柔性砼超薄防渗墙工法及在垃圾填埋场防渗工程中的应用

柔性砼超薄防渗墙工法在地下防渗工程中具有诸多优越性,但将该工艺应用到上海浦东黎明垃圾填埋场改建防渗工程,在国内同类工程中尚属首次。实践证明其防渗效果良好,具有广阔的应用前景和推广意义。结合该工程实例,就柔性砼超薄防渗墙工法在垃圾填埋场应用中的施工工艺、质量控制措施进行简要讨论,并提出合理选择防渗施工工艺的一些建议。     

钻孔灌注桩在软土地区深大基坑围护工程中的应用

上海市某基坑工程开挖深度与开挖面积均较大,周边环境复杂,变形要求高。基坑围护工程采用钻孔灌注桩加双头水泥土搅拌桩隔水加二道支撑的方案,分层分区、限时开挖支撑,信息化施工,保证了基坑的顺利开挖,取得了令人满意的工程效果。     

三目立体工业摄影测量系统外部参数的快速标定

针对我国锻件在位检测装置和测量方法落后的问题以及立体工业摄影测量现场控制场建立难的问题,开发出三目立体工业摄影测量系统,并提出系统外部参数标定方法,将控制场坐标系建立在相机上。试验证明,利用三目立体工业摄影测量系统解算物方点坐标的精度为0.201mm,验证标定精度的可靠性,满足在高温锻件测量现场建立简单、有效的高精度立体工业摄影测量控制场的应用需求。