冲砂分流封隔器结构设计及分析

油井出砂是油田开采中后期常见的问题,出砂后不仅会磨蚀井下设备,也会砂埋油层,造成油井停产,危害极大。针对目前常规冲砂技术具有皮碗磨损严重,作业管柱摩阻大等问题,研制了一种可应用于冲砂洗井作业的分流封隔器,并从结构设计、工作原理及密封性能等方面进行了分析。该工具自身设计分流通道,满足正、反循环要求,且皮碗可多次收缩、张开,能够有效降低管柱摩阻,减少作业风险,应用前景广阔。     

装配式建筑工程钢筋桁架叠合板施工技术研究

选择某装配式建筑工程为研究对象,从钢筋桁架叠合板的概念与施工技术入手,提出钢筋桁架叠合板施工过程中的注意事项,并对施工技术方案进行详细探究,以有效提升工程项目建设质量。     

1kW类汽油发电机组润滑系统油位传感器性能检测研究

简述1 kW类汽油发电机组采用的润滑油油位传感器结构和工作过程,针对其性能检测缺少配套工装设备的实际,通过分析研究其工作原理,设计制作了低油位传感器检测设备,以满足1 kW类电站大修工作需要。     

(Al,B)-MCM-41分子筛在气相贝克曼重排反应中的应用

用改进的快速合成法制备了2个系列的催化剂,并用XRD、N2吸附、FT-IR、27Al MAS、NMR和NH3-TPD等手段对其表征,用环己酮肟气相贝克曼重排反应评价其活性。结果表明,合成的催化剂具有MCM-41的结构,铝和硼进入到分子筛的骨架中。当n(Al)/n(B)的值一定时,随着铝和硼添加量的增多,分子筛的弱酸性位的数量增多,己内酰胺的选择性升高。当添加的铝和硼的总量一定,随着铝含量的减少,相应硼的量增加,己内酰胺的选择性升高。只添加硼时环己酮肟转化率和己内酰胺的选择性均很低。(Al,B)-MCM-41分子筛在气相贝克曼重排反应中的活性主要与骨架中的铝和硼的数量以及弱酸位的数量有关。     

淮河上游全新世黄土及沉积成因

The dust source and transporting system are two indispensable aspects in the process of loess-palaeosol accumulation. It has been proved that the dust of the Loess Pla-teau mainly comes from the northwestern inland gobi and desert, transported by the East Asia monsoon systems and westerlies. However, there are little researches with respect to the dust source and deposition dynamics of the upper reaches of the Huaihe River. In the present study, we investigated and collected the YPC section with high resolution in the upper reaches of the Huaihe River. The chronological frame was reconstructed by optically stimu-lated luminescence(OSL)dating and correlated with the published loess time series. By comparison of the magnetic susceptibility(MS)and grain size(GS)of loess-soil profile among YPC profile, XJN profile(western Loess Plateau)and the JYC profile(southern Loess Pla-teau), we find sirnilar climate change and pedogenic process between the upper reaches of the Huaihe River and the Loess Plateau, both experienced an extreme dry and the weakest pedogenesis during the last glacial, followed by a transitional episodes from the cold-dry last glacial to the warm-humid mid-Holocene and increased pedogenesis in the early Holocene,then a most humid-warm and strong pedogenesis in the mid-Holocene, and climate deterio-ration and decreased pedogenesis occurred during the late Holocene. But the MS of loess-soil profile sequences in the upper reaches of the Huaihe River was much lower than those in the Loess Plateau, and the GS was much coarser than those in the Loess Plateau.Comparison of GS for these three profiles revealed that there were different dust sources,which belonged to different aeolian transporting systems. The loess in the upper reaches of the Huaihe River was a wind blown deposition of near source, while the coarser dust mainly came from loose alluvial deposits of alluvial and proluvial fans of the Yellow River. The yield-ing and carrying dynamics of the dust in the Huaihe River is the northeast wind prevails in the winter half year.     

量子级联红外探测器

半导体基中远红外探测器在成像、传感、国家安全以及国防领域具有广泛的应用背景.目前,在这个领域最主流的技术之一是量子阱红外探测器( QWIPs).传统的量子阱红外探测器往往存在较大的暗电流和较低的工作温度等限制.量子级联探测器( QCDs)是一种新型的光伏型量子阱红外探测器.其工作原理基于电子吸收光子后在量子阱的子带间跃...     

聚硅氧烷/丙烯酸树脂乳胶互穿网络(IPN)的研究

在乳液体系和微酸性条件下 ,有机硅 D4(八甲基环四硅氧烷 )开环聚合和丙烯酸酯自由基聚合 ,形成同步互穿网络聚合物 ,该复合物膜具有良好的疏水和抗溶剂性能及良好的耐低温和高温性能 ,该乳液用于皮革的涂饰 ,能明显改善涂层的触感和增进涂层的亮度。     

通过试验方法确定汽轮机组滑压运行的最优参数

由于制造厂提供的滑压运行曲线不能满足机组实际运行工况的要求,通过现场试验确定机组滑压运行最优参数十分必要;介绍了机组运行优化调整的2种主要方法:试验寻优法及数学寻优法;以某电厂300 MW、直接空冷、供热汽轮机组为例,结合试验寻优法与数学寻优法确定了机组各工况下主蒸汽的最优参数,并绘制出机组负荷与最优主蒸汽压力间的关系曲线;指出了机组滑压运行的注意事项。     

《测量数据处理》课程教学探讨

文中以高等职业教育工程测量技术专业教学资源库建设项目——《测量数据处理》子项目为背景,对测绘专业测量数据处理课程整体设计、课程资源建设和课程教学实施展开简要阐述。     

甲醇／柴油双燃料发动机工作区域的试验研究

在TY1100单缸柴油机的进气管上安装了电控甲醇喷射装置,采用柴油引燃甲醇双燃料工作模式,开展了甲醇/柴油双燃料发动机工作区域的试验研究.结果表明:双燃料发动机存在由熄火界限、工作粗暴界限和碳烟排放界限三者组成的工作区域.在此区域内,甲醇/柴油双燃料发动机的万有特性曲线中最经济区域位于发动机中高转速和中高负荷区,且随着引燃柴油量的增加向发动机高转速区域移动.随着甲醇质量分数的增加,发动机Nox和碳烟排放可以同步降低.