埋地管道外检测技术在油田油气集输管线检测中的应用

油田埋地管道应用越来越广泛,随着运行时间的延长,运行环境恶劣,设备自身的老化等原因导致的管道失效将造成资源浪费、环境污染以及对社会安全的威胁。应用先进的外检测技术,对油田埋地管道进行检测以及评价,可以极大限度的保证油田生产的安全运行。本文介绍了埋地管道外检测技术在油田油气集输管线检测中的应用情况,并根据检测结果和数据归纳了检测过程中出现的埋地管道存在的主要问题,并对影响埋地管道安全运行的原因进行了总结分析,提出了相应的建议和措施,为指导油田埋地管道的设计、施工、日常生产管理与维护提供技术支持。     

散装水泥车卸料管道内部运动分析

基于CFD软件Fluent和气固二相流理论,以散装水泥车卸料管道为研究对象,建立二维模型,对补气速度、2管直径比和2管道交角可能对管内流动产生的影响进行仿真计算,观察水泥相的体积分布情况,分析各因素的影响结果     

埋地金属管道泄漏点综合检测试验研究

针对现有检测技术难以解决埋地金属管道泄漏点定位的技术难题。通过综合利用交流电压梯度检测技术及连续式瞬变电磁技术,可以确定管体壁厚异常变化区域。试验结果表明,将防腐层检测与管体检测技术相结合可以进行埋地管道泄漏点检测,定位精度约为±1．0m。     

Measuring large 3D structures using four portable tracking laser interferometers

A new concept that allows measuring 1D–3D objects in the range of several centimeters to 5 m × 5 m × 5 m is presented. In general terms the concept can be seen as a task specific correction of geometrical errors of coordinate measuring machines (CMMs). The developed system comprises a commercial CMM, its measurement and its evaluation software and a set of at least four high accurate tracking laser interferometers. The CMM is simply used as a mover which allows to capture points on the surface of a measuring object. In parallel the tracking laser interferometers follow a retro-reflector located close to the stylus tip of the tactile probe of the CMM. Based on a multi-lateration algorithm 3D-positions are calculated from the measured interferometric distances. Finally, two sets of coordinates emerged, namely, one by the CMM and the second from the metrological frame of the tracking laser interferometers. The interferometrically measured positions are usually more precise than the positions measured by the CMM. This is due to the high accuracy of the interferometric system and also due to the fact that the measurement positions are taken in a manner which almost avoids Abbe errors. Because of that, the measurement positions of the CMM are substituted with the more accurate measurement points calculated from distance measurements of the tracking interferometers. The position coordinates thus obtained are used for the further computerized evaluations, which yield the geometric parameters of the object measured. First measurements under laboratory condition show very promising results. It has been demonstrated that the concept is suitable for the high precision calibration of large workpieces with small tolerances, for instance, for the calibration of large gears for the windmill industry.     

埋刮板输送机防磨刮板链条研究与应用

刮板链条是埋刮板输送机的牵引及承载构件,需要连续、顺利地通过机槽,却经常因为各种因素造成与机壳侧板发生磕碰、摩擦,碰弯刮板、磨损刮板端部、磨穿机壳侧板.目前采用的增加机壳厚度,选用耐磨性能更好的材料,增设耐磨衬板,刮板加厚或者端部堆焊耐磨焊条,加大机槽宽度、降低刮板链条运行速度等措施,提高埋刮板输送机的制造和安装精度,...     

回顶法灌注混凝土浆成桩工艺

探讨了回顶法灌注混凝土浆的成桩工艺，分析了影响混凝土浆灌注质量的主要因素，并给出了相应的技术参数和措施。     

Age-related binding deficits and the content of false memories.

The authors examined effects of age-related binding deficits on feature information in false memories for imagined objects (e.g., lollipop) that were similar in shape to seen objects (e.g., magnifying glass). In Experiment 1, location memory for seen objects was lower in older than younger adults and lower still in old-old than young-old adults. Imagined objects, when falsely called seen, were less likely to be attributed to the location of similar seen objects (i.e., congruent attributions) by old-old than young-old adults. In Experiment 2, for younger adults, displaying seen objects for less time (1 s vs. 4 s) reduced both location memory for seen objects and congruent attributions for false memories. Thus, binding deficits may influence the specific content of false memories. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

直埋敷设蒸汽管道的保温节能工艺

自八十年代中期从丹麦等北欧国家引进热水管道直埋技术后，该技术在我国已日趋成熟。但蒸汽管道直埋因其供热介质温度高，对其保温提出了更高的要求。本文简述了直埋蒸汽管道的保温、补偿、节点处理、支架设置等问题。     

埋地钢管结构设计思路的探讨

主要通过对国内和美国手册关于埋地钢管不同的设计思路进行分析对照,尤其在不同工况、不同土弧包角及砂浆衬砌作用下对钢管壁厚设计的影响进行了探讨,可为其它工程设计提供借鉴。     

C++语言编程技术分析

阐述了C++语言与C语言的关系,以及C++编程技术的基础,对C++最为突出的程序设计功能类和对象进行分析,给出了C++语言编程的有关技巧.