保温油罐抗风圈腐蚀穿孔的修复及改造

保温油罐抗风圈及罐底板外根部因酸雨聚积形成电化学腐蚀。由于沿海地区空气温度大，盐分重及罐内的温度高，加快了设备的腐蚀。通过对1000立方米燃料油罐的腐蚀原因分析，提出了改造与预防措施。改造后的抗风圈结构能有效地排出进入保温层内的雨水，从而避免了的电化学腐蚀。     

一种复合保温覆盖材料研制和应用试验初报

研制了一种替代草帘的日光温室夜间外覆盖的新型保温材料。这是一种复合材料,隔热保温性优于草帘;质地轻,卷放省力、省工;防水、较耐用;价格适当;洁净光滑,不损伤沾污棚模。经二年在多点应用,普遍反映良好。     

绝缘接头或绝缘法兰绝缘性的讨论

绝缘接头或绝缘法兰是管道阴极保护中必不可少的重要管件，但在现场安装时都曾出现过绝缘性达不到替代洒求值的问题。对此现象进行了剖析，指出影响电绝缘性的主要原因是绝缘连接头的绝缘材料制造，装配等方面的质量问题。     

Study on diagnostic method for defects in an IGBT module based on DTW deviations of time series

Insulated gate bipolar transistor(IGBT) is one of the key reliability sensitive components of power electronic equipment. Developing prognostic method for defects in an IGBT module is an important measure to enhance the reliability lever of IGBTs. Therefore,a novel prognostic method based on dynamic time warping(DTW) deviations of time series is presented. This method utilizes variations of DTW of gate voltage series caused by defects to estimate if any defect existes in an IGBT module before breakdown. And application value is verified by test results.     

新型低压绝缘分裂导线供电模式的实施与展望

针对目前低压电网普遍存在的电能损耗偏高、电压质量差及窃电严重等问题,研制一种新型低压绝缘分裂导线,并基于该导线结构特点提出了供电新模式。示范区二年多的实施结果表明,其经济社会效益显著,对减轻农民电费负担、节支增效有重要的实际意义。     

A Hilbert fractal antenna and portable monitoring system for partial discharge detection in gas insulated substations

We design a third Hilbert fractal antenna for partial discharge (PD) monitoring in gas insulated substations (GIS) based on fractal principles, and analyze the Hilbert antenna impedance characteristics using an equivalent inductance method of parallel transmission lines. The PD experiment of metal protrusion defect is conducted employing fractal and microstrip antennae. The test results show that the characteristic of the Hilbert fractal antenna has good performance and can detect the PD signal for online monitoring in GIS. A portable online monitoring and locating system for GIS is established using the Hilbert fractal antenna and LabVIEW. The locating accuracy of the PD source in the laboratory meets the requirements of the PD site location.     

The Effect of Slabs on the Failure Mode of Reinforced Concrete Frame Structures

A majority of reinforced concrete frame structure failure patterns resulting from the May 12, 2008 earthquake in Wenchuan County, P. R. China were analyzed. It was found that the main failure mode of frame works was “strong beam, weak column”, which conflicts with the design criteria of “strong column, weak beam”. The cause of this failure pattern was analyzed. A new concept is put forward that should be considered in design work. The over strength caused by slabs connected monolithically to the beams is analyzed. The joint types, transverse beam stiffness and lateral drift influence the reinforcing effect of the sla, Moreover, a reinforced concrete frame model was simulated using the program ABAQUS. The slab reinforcement stress distributions at different lateral drifts were analyzed and the effective flange width value proposed.     

长呼原油管道保温与不保温方案比选

基于长庆油田一呼和浩特石化原油管道工程项目沿线地形地貌和管输原油物性,依据相关标准,讨论了保温方案和不保温方案在设计参数、安全停输时间、经济投资等方面的差异.结果表明:相同管径下不保温方案的管道传热系数约为保温方案的2～3倍,加热油耗约为保温方案的2倍,安全停输时间比保温方案缩短15.5 h,同时总体投资比保温方案高出1 742×104元,费用现值比保温方案高出3.6×108元.因此该管道工程项目推荐采用保温方案,以减少热站数量和运行人员设置,降低运行管理费用.(表4,图4,参2)     

绵羊肺炎支原体恒温热隔绝式PCR方法的建立

为建立绵羊肺炎支原体(Mo)感染疾病的现场便捷化诊断方法,本研究选择Mo高度保守区域tuf基因设计合成一对特异性引物和探针,建立了恒温热隔绝式PCR(iiPCR)方法并对其特异性、灵敏性进行评价。结果显示,建立的iiPCR方法仅对Mo的典型菌株和其临床分离菌株的DNA呈阳性结果,具有较强的特异性;对Mo基因组DNA的检出下限为24fg/μL,具有较高的敏感性。利用该方法检测临床样品,结果显示该方法可以从临床采集的羊鼻拭子及支气管拭子中检测出MoDNA,对扩增产物的测序表明检测结果具有较高的准确性。本研究建立的iiPCR方法为Mo的检测及其感染疾病的诊断提供了快速、便捷的技术手段。     

基于ABAQUS螺栓接头的接触有限元分析

螺栓接头是一种广泛应用的管道连接方式。工程实践证明,法兰强度的破坏极为罕见,而泄漏则是连接失效的主要形式,因此法兰的密封性能成为研究的重点。采用接触有限元方法,计算了螺栓、法兰和垫片三者之间的相互作用,给出了法兰和垫片间接触压强的分布规律,指出了考虑法兰接头密封时管道内压是一个不可忽略的计算因素,验证了螺栓之间的区域为密封的薄弱环节。对有效和准确的评价法兰接头的密封性能,改进法兰接头结构设计,提供了重要的参考。