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| 1 | Recent developments of large diameter X80 UOE line pipes显示文摘High-strength pipeline steel and large diameter line pipes are often used to increase the capacity of transportation and reduce the cost associated with the construction and operation of long-distance gas pipeline projects. China's initiatives to construct long-distance natural gas pipelines has brought in new opportunities for the development of X80 line pipes. Baosteel has designed the optimum chemical composition of X80 with high niobium and low molybdenum content. In addition,a welding experimental platform and a finite element model(FEM) have supported the development of X80 UOE pipes in an efficient and economical way. The application and recent development of X80 UOE pipes were introduced in this paper. To comply with the requirements of the Second West-East Gas Pipeline Project(2ndWEPP),X80 pipeline steel with low carbon bainite microstructure was developed by utilizing the optimized composition and TMCP process. The matching welding material,welding procedure and UOE forming processes for 1219mm outside diameter X80 UOE pipes were also developed. More than 340000 t of X80 UOE pipes were produced and applied in the 2ndWEPP. Furthermore,to meet the prospective demand for long-distance gas pipelines with an annual transportation capacity of over 40 billion m3,larger size X80UOE pipes with 1 422 mm OD × 30. 8 mm WT were trial produced recently. DWTT performance,the main technical challenge for heavier wall pipes,was improved by using optimized microstructural design. The newly developed X80 pipes can be potentially used for larger transportation capacity pipelines in China. | ZHANG Chuanguo ZHENG Lei XIE Shiqiang ZHANG Bei HAN Jianzeng QIAN Weifang | 2014 | Baosteel Technical Research2014，8，2： | 9 |
| 2 | Numerical simulation of the UOE forming process based on MSC. Marc secondary development technology显示文摘U-ing-O-ing-Expanding (UOE),the main process for making longitudinal submerged arc welded pipe(LSAW) with steel plate,is famous for its superior quality and reliability.Based on the famous non-linear finite element analysis (FEA) software MSC.Marc,a finite element model (FEM) has been established to simulate the whole UOE forming process by using the secondary development technology with the Python language.Research has also been conducted systematically on the crimping,U-ing,O-ing and mechanical expanding processes.The practice has shown that the simulation calculation is in close conformity with the actual site production data.The FEM has been successfully applied in the UOE production at Baosteel. | HAN Jianzeng SUN Jian' an | 2010 | Baosteel Technical Research2010，4，3： | 4 |
| 3 | Equations calculate collapse pressures for casing strings显示文摘 | HAN Jianzeng SHI Taihe | 2001 | Oil and Gas Journal2001，99，4： | 1 |
| 4 | Non-uniform Loading Affects Casing Collapse Resistance显示文摘 | Han Jianzeng Shi Taihe | 2001 | Oil & Gas Journal2001，7，11： | 1 |
| 5 | Non - uniform loading affects casing collapse resistance显示文摘 | HAN Jianzeng SHI Taihe | 2001 | Oil & Gas Journal2001，06，： | 1 |
| 6 | Stress distribution of oil tubing thread connection during make and break process显示文摘 | Guangjie Yuan Zhenqiang Yao Jianzeng Han | 2004 | Engineering Failure Analysis2004，11，4： | 1 |
| 7 | Stress dis- tribution of oil tubing thread connection during make and break process显示文摘 | Guangjie Yuan Zhengqiang Yao Jianzeng Han | 2004 | Engineering Failure Analysis2004，11，4： | 1 |
| 8 | Equations calculate pressures for casing strings显示文摘 | HAN JIANZENG SHI TAIHE | 2001 | Oil & Gas Journal2001，，22： | 1 |
| 9 | Non-uniform loading affects easing collapse resistance 显示文摘 | HAN Jianzeng SHI Taihe | 2001 | Oil & Gas Journal2001，06，： | 1 |
| 10 | Non uniform loading affects casing collapse resistance显示文摘 | Han Jianzeng Shi Taihe | 2001 | Oil & Gas Journal2001，99，25： | 1 |
| 11 | Exper- imental research on stress field distribution of oil tubing thread connection during make and break process显示文摘 | Yuan Guangjie Yao Zhenqiang Han Jianzeng etal | 2004 | Engi- neer Failure Analysis2004，11，4： | 1 |
| 12 | Equations calculate collapse pressures for casing strings显示文摘 | Han Jianzeng Shi Taihe | 2001 | Oil & Gas Journal2001，99，4： | 1 |
| 13 | Non-uniform loading affects casing collapse resistance显示文摘 | Han Jianzeng Shi Taihe | 2001 | Oil & Gas Journal2001，99，25： | 1 |
| 14 | Dyssynchrony Induced by Ventricular Preexcitation: A Risk Factor for the Development of Dilated Cardiomyopathy显示文摘Background:Signifi cant left ventricular dysfunction may arise in right-sided accessory pathways with ventricular preexcitation in the absence of recurrent or incessant tachycardia.This has just been realized and not enough attention has been paid to it.Methods:In the last 7 years,we identifi ed 12 consecutive children with a diagnosis of ventricular preexcitation–induced dilated cardiomyopathy.This report describes the clinical and echocardiographic characteristics of the patients before and after ablation.Results:Dyssynchronous ventricular contraction was observed by M-mode echocardiography and two-dimensional strain analysis in all patients.The basal and middle segments of the interventricular septum became thin and moved similarly to an aneurysm,with typical bulging during the end of systole.The locations of the accessory pathways were the right-sided septum(n=5)and the free wall(n=7).Left ventricular synchrony was obtained shortly after ablation.The left ventricular function recovered to normal and the left ventricular end-diastolic diameter decreased gradually during follow-up.Conclusions:A causal relationship between ventricular preexcitation and the development of dilated cardiomyopathy is supported by the complete recovery of left ventricular function and reversed left ventricular remodeling after the loss of ventricular preexcitation.Preexcitation-related dyssynchrony was thought to be the crucial mechanism.Ventricular preexcitation–induced dilated cardiomyopathy is an indication for ablation with a good prognosis. | Chencheng Dai Baojing Guo Ling Han Caihua Sang Jianzeng Dong Changsheng Ma | 2020 | Cardiovascular Innovations and Applications2020，，3： | 0 |
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