SAE8640合金钢280mm x325mm连铸坯的高温力学性能

采用Gleeble 1500热模拟试验机对SAE8640钢280mm×325mm连铸坯（/% : 0.41C,0.20Si,0.80Mn,0.005S,0.014P,0.46Cr,0.43Ni,0.21Mo,0.043Alt,0.0011O,0.0054N）的550~1200℃力学性能进行了测定,并应用扫描电镜观察了拉力试样的断口形貌。结果表明,SAE8640钢有明显的3个脆性区:Ⅰ脆性区＞1200℃,Ⅱ脆性区950~1000℃,Ⅲ脆性区650~750℃;该钢950~1000℃的断面收缩率为60%,拉伸断口为脆性河流状花样,应避免在该温度范围进行轧制,该钢650~750℃的断面收缩率≥65%,拉伸断口为韧性断裂,可满足连铸坯矫直时塑性的要求。     

HACCP系统在速冻水饺生产中的应用

本文详述了如何依据速冻水饺生产工艺,从原辅料验收到成品出厂的整个工艺过程中分析出可能存在的危害及CCP点的具体控制方法,并制定相应控制限值及监控体系HACCP计划工作模式,以提高速冻水饺生产管理水平和食用安全性。     

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。     

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.     

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。     

《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。     

桥式起重机卷筒联轴器的应用

重型桥式起重机起升减速机与卷筒的联接技术是吊车重要的核心技术,也是起重机安全可靠运行的重要联接部件。通过对国内大型钢铁冶铁企业的了解,提出主起升鼓形滚柱卷筒联轴器改型为球铰联轴器的改进意见。     

气动模拟左心室建模和控制

体外模拟循环系统是心室辅助装置研发的重要测试平台。为了实现体外模拟循环系统中气动模拟左心室压力的控制,从密封容器腔气体压力和温度微分方程以及电比例阀节流口流量公式出发,建立了气动模拟左心室装置完整的数学模型,设计了基于双闭环反馈的模拟左心室压力控制器。控制器和模拟左心室模型在MATLAB/Simulink软件中进行了联合数值模拟。数值模拟的结果表明,模拟左心室压力控制误差小,验证了气动模拟左心室装置及其压力控制方法的可行性。