Volume 5: High-Pressure Technology; Rudy Scavuzzo Student Paper Symposium and 27th Annual Student Paper Competition; ASME Nondestructive Evaluation, Diagnosis and Prognosis Division (NDPD)最新文献

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A Case Study: A Systems Approach for 20ksi Equipment Qualification 案例研究:20ksi设备鉴定的系统方法
J. B. Raney, Gregg Walz, D. Kaminski
{"title":"A Case Study: A Systems Approach for 20ksi Equipment Qualification","authors":"J. B. Raney, Gregg Walz, D. Kaminski","doi":"10.1115/pvp2019-93750","DOIUrl":"https://doi.org/10.1115/pvp2019-93750","url":null,"abstract":"\u0000 Beginning in August 2013, Anadarko Petroleum formed the “20A Project Initiative” for qualifying 20 ksi equipment for a Deepwater Gulf of Mexico (GoM) development. This paper will cover the systems approach used for the qualification (verification, validation and quality) of a system of components, including sub-assemblies and assemblies that are required for a 20 ksi development. The systems approach begins with the framework and management of this framework inside the overall development process. The systems approach categorizes each component by mode of operation (many pieces of equipment are used in multiple operational modes). These modes of operation are Drilling, Completions, Production and Intervention, and are the engineering systems used to manage the qualification of over 200 components to industry standards and U.S. government requirements. The functional requirements for each component are defined and vendors selected. Each component is then stewarded through a project-management process for design, verification, validation and quality. This process culminates with the integration of these components back into a system that can be qualified for use in an HPHT environment. This paper addresses the submittal to regulatory authority for approval to use the newly developed and qualified 20 ksi equipment for a deepwater GoM development.\u0000 This project ends in 2019. This six-year development journey presented challenges and achieved breakthrough technologies for the industry. This journey, its organizational approach using systems engineering techniques and integration processes are presented.","PeriodicalId":174920,"journal":{"name":"Volume 5: High-Pressure Technology; Rudy Scavuzzo Student Paper Symposium and 27th Annual Student Paper Competition; ASME Nondestructive Evaluation, Diagnosis and Prognosis Division (NDPD)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128734610","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Overview of Revisions to the ASME Boiler and Pressure Vessel Code Section VIII Division 3 for the 2019 Edition and Near Future ASME锅炉和压力容器规范第VIII节第3部分2019版和近期修订概述
Adam P. Maslowski, Gregory Mital, D. Peters, K. Subramanian
{"title":"Overview of Revisions to the ASME Boiler and Pressure Vessel Code Section VIII Division 3 for the 2019 Edition and Near Future","authors":"Adam P. Maslowski, Gregory Mital, D. Peters, K. Subramanian","doi":"10.1115/pvp2019-93102","DOIUrl":"https://doi.org/10.1115/pvp2019-93102","url":null,"abstract":"\u0000 This paper provides an overview of the significant revisions to the upcoming 2019 edition of the American Society of Mechanical Engineers (ASME) Boiler and Pressure Vessel Code (BPVC) Section VIII Division 3, Alternative Rules for Construction of High Pressure Vessels, as well as potential changes to future editions under consideration of the Subgroup on High Pressure Vessels (SG-HPV).","PeriodicalId":174920,"journal":{"name":"Volume 5: High-Pressure Technology; Rudy Scavuzzo Student Paper Symposium and 27th Annual Student Paper Competition; ASME Nondestructive Evaluation, Diagnosis and Prognosis Division (NDPD)","volume":"247 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122514602","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Integrity Assessment of Cables Under Postulated Electrical Fire Accidents in a Zero-Power Research Reactor 零功率研究堆电气火灾条件下电缆完整性评估
Jae-Min Jyung, Yoon-Suk Chang
{"title":"Integrity Assessment of Cables Under Postulated Electrical Fire Accidents in a Zero-Power Research Reactor","authors":"Jae-Min Jyung, Yoon-Suk Chang","doi":"10.1115/pvp2019-93340","DOIUrl":"https://doi.org/10.1115/pvp2019-93340","url":null,"abstract":"\u0000 Fire protection and appropriate management are important to ensure security of nuclear facilities alike other industries. While relevant hazard analyses have been successfully carried out for commercial reactors, based on recently strengthened IAEA guideline and national standards, examination of research reactors is also required. The objective of this study is to represent integrity assessment of safety related cables connected to operating console in the control room of a zero-power research reactor. Two postulated electrical fire scenarios were identified among diverse accident causes and systematically analyzed by two numerical softwares with different turbulence models. Both polyvinyl chloride and cross-linked polyethylene were selected, respectively, as the representatives of various thermoplastic and thermoset cable materials. As results, temperature and heat flux profiles of the cables were calculated. Their maximum values were compared with the corresponding damage criteria, of which details and key findings will be discussed.","PeriodicalId":174920,"journal":{"name":"Volume 5: High-Pressure Technology; Rudy Scavuzzo Student Paper Symposium and 27th Annual Student Paper Competition; ASME Nondestructive Evaluation, Diagnosis and Prognosis Division (NDPD)","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130376319","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Mechanical Enhancement and Strain Sensing of Electrofusion Joint With Carbon-Fiber-Reinforced Polyethylene 碳纤维增强聚乙烯电熔接头的力学增强与应变传感
Yao Riwu, Jianfeng Shi, Jinyang Zheng
{"title":"Mechanical Enhancement and Strain Sensing of Electrofusion Joint With Carbon-Fiber-Reinforced Polyethylene","authors":"Yao Riwu, Jianfeng Shi, Jinyang Zheng","doi":"10.1115/pvp2019-93347","DOIUrl":"https://doi.org/10.1115/pvp2019-93347","url":null,"abstract":"\u0000 Electrofusion (EF) technology is widely used for connecting plastic pipes or composite pipes. For these pipes used in natural gas transportation and nuclear power plant, the higher and higher operation pressure makes the strength of EF joint a limitation in the pressure pipeline systems. In this paper, high density polyethylene (HDPE) filled with different contents of short-cut carbon fiber (CF) was prepared by melt mixing and injection molding. Scanning electron microscopy imagines indicated a good dispersion of CF in HDPE matrix. Experiments were carried out to evaluate the mechanical and electrical properties of the HDPE-CF composite. The addition of CF improved the elastic modulus and yield stress of the composite compared with neat HDPE. The enhanced mechanical properties of HDPE-CF composite can improve the strength of EF joints, and bursting tests revealed a burst pressure of 8.11 MPa, which is 41.8% higher than that of neat HDPE EF joint. Based on the improved electrical conductivity, the electrical resistance of EF joint induced by the strain under internal pressure can be monitored for structural health monitoring of the pipeline. Thus, the combination of mechanical enhancement and strain sensing of EF joint with carbon-fiber-reinforced polyethylene can improve the strength and reliability of pressure pipeline.","PeriodicalId":174920,"journal":{"name":"Volume 5: High-Pressure Technology; Rudy Scavuzzo Student Paper Symposium and 27th Annual Student Paper Competition; ASME Nondestructive Evaluation, Diagnosis and Prognosis Division (NDPD)","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125653792","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Limits of Allowable Static and Cyclic Loads on Lens Ring Gaskets 透镜环垫片允许静载荷和循环载荷的极限
H. Maderbacher
{"title":"Limits of Allowable Static and Cyclic Loads on Lens Ring Gaskets","authors":"H. Maderbacher","doi":"10.1115/pvp2019-93566","DOIUrl":"https://doi.org/10.1115/pvp2019-93566","url":null,"abstract":"\u0000 Due to their relative simple handling and the high reliability, lens ring gaskets are widely used in high pressure connections. In addition, they are able to withstand large external forces without being damaged but at the same time they do not lose leak tightness even with very small contact forces. This ability to withstand high loads allows a lens ring gasket to be reused several times with minimal polishing after disassembling the flange connection.\u0000 However, this reusability has its end when the lens ring gasket is damaged or destroyed by static or cyclic overload. Static overload is mainly caused by too high bolt tightening force and leads to large scale plastic deformation. This damage can be easily avoided by choosing the correct bolt preload and proper flange alignment. A greater difficulty is the damage prediction by cyclic overload. This is caused by pressure fluctuations, excitations in the range of natural frequencies or other external cyclic loads. The effects of these mentioned loads on the service life of the lens ring gasket additionally depend on factors such as the stiffness of the individual components of the flange connection, the initial bolt preload or the materials used.\u0000 In the present work a method is presented which is able to predict the load limits of lens ring gaskets under static and cyclic loading. This method allows the consideration of different geometric influences of the individual components, of different materials and bolt preloads. From the static and cyclic forces on the flange connection, local stresses in the lens ring are calculated. This enables making a statement regarding plastic deformation due to bolt load and fatigue failure due to cyclic loads.","PeriodicalId":174920,"journal":{"name":"Volume 5: High-Pressure Technology; Rudy Scavuzzo Student Paper Symposium and 27th Annual Student Paper Competition; ASME Nondestructive Evaluation, Diagnosis and Prognosis Division (NDPD)","volume":"302 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124281968","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Study on Fatigue Crack Growth Behavior of Zr702/TA2/Q345R Composite Plate With a Through-Wall Crack and a Crack Normal to Interface for SENT Specimen Zr702/TA2/Q345R复合材料穿壁裂纹与界面法向裂纹扩展行为的send试样研究
Bin-Bin Zhou, Chang-yu Zhou, Xiao-hua He
{"title":"Study on Fatigue Crack Growth Behavior of Zr702/TA2/Q345R Composite Plate With a Through-Wall Crack and a Crack Normal to Interface for SENT Specimen","authors":"Bin-Bin Zhou, Chang-yu Zhou, Xiao-hua He","doi":"10.1115/pvp2019-93325","DOIUrl":"https://doi.org/10.1115/pvp2019-93325","url":null,"abstract":"\u0000 In this paper, the fatigue crack growth behavior of Zr702/TA2/Q345R composite plate with a through-wall crack and a crack normal to interface for SENT specimen are studied. For the through-wall crack, the mutual interference in fatigue crack growth rate is found. The crack growth rate of the through-wall crack on both sides in Zr702/TA2/Q345R composite plate depends on the difference of stress intensity factors amplitude caused by the different positions of crack tips on both sides and the crack growth rate in corresponding homogeneous material. For the crack normal to interface, two crack propagation directions are taken into account. When crack initiates from the lower strength material side, the crack growth rate decreases to the minimum before crack penetrates the interface. After crack penetrates the interface, crack growth rate accelerates continuously. When crack initiates from the higher strength material side, the fatigue crack growth rate generally increases with the crack length. For both crack forms, all experiment results demonstrate that the crack growth rate is dependent on the competition of the stress intensity factor amplitude, the crack growth rate in corresponding homogeneous material and the interface strength. Besides, finite element results show that elastic mismatch results in a significantly change in the distribution of stress intensity factor amplitude.","PeriodicalId":174920,"journal":{"name":"Volume 5: High-Pressure Technology; Rudy Scavuzzo Student Paper Symposium and 27th Annual Student Paper Competition; ASME Nondestructive Evaluation, Diagnosis and Prognosis Division (NDPD)","volume":"275 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121529007","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
A New Accurate Quantitative Inspection Technology to the Corrosion for the Offshore Erect Pipeline 一种新的海洋直立管道腐蚀精确定量检测技术
Cong Guangpei, Su Yujiang, Lv Guanglei, Yunrong Lv, Shuxia Fu
{"title":"A New Accurate Quantitative Inspection Technology to the Corrosion for the Offshore Erect Pipeline","authors":"Cong Guangpei, Su Yujiang, Lv Guanglei, Yunrong Lv, Shuxia Fu","doi":"10.1115/pvp2019-93440","DOIUrl":"https://doi.org/10.1115/pvp2019-93440","url":null,"abstract":"\u0000 The erect pipe is a dangerous one with a special double concentric pipes, in which the inner pipe and outer pipe are both corroded on the offshore platform so that a effective corrosion inspection is needed to measure the thinning to the inner pipe and outer pipe at the same time. In addition, because of the narrow space in the offshore platform, it is difficult for the digital X-ray tangential photography (DR) to be implemented during the operation because of the larger X-ray dose that is enough to threaten the personal safety according to the standards in China. Hence, a special inspection tech is demanded to obtain the wall thicknesses of erect pipe which is the most important information to the corrosion management. In this article, A new measuring tech is proposed for the concentric multi-pipe structure to dissolve the bottleneck on the inspection of the offshore erect pipeline. Through the tangential scanning and a wall boundary identifying algorithm, the tech can accurately measure the wall thicknesses of erect pipe, and the ray dose can also be decreased about to the one thousandth of traditional DR, which can guarantee the safety of a inspection and monitoring during the operation in a narrow space as the offshore platform. Besides, the low dose of ray doesn’t influence the accuracy of the measurement which can still be kept into 0.2mm according to the theoretical analysis and experimental data.","PeriodicalId":174920,"journal":{"name":"Volume 5: High-Pressure Technology; Rudy Scavuzzo Student Paper Symposium and 27th Annual Student Paper Competition; ASME Nondestructive Evaluation, Diagnosis and Prognosis Division (NDPD)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121596616","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Vibration Suppression in Frame-Structural Tower With Fluid Viscous Dampers 用粘性阻尼器抑制框架结构塔的振动
Xiantao Fan, Du Yi'an, W. Tan
{"title":"Vibration Suppression in Frame-Structural Tower With Fluid Viscous Dampers","authors":"Xiantao Fan, Du Yi'an, W. Tan","doi":"10.1115/pvp2019-93333","DOIUrl":"https://doi.org/10.1115/pvp2019-93333","url":null,"abstract":"\u0000 Flexible and skyscraping frame-structural tower is sensitive to dynamic loads, that might oscillate intensely under seismic and wind loads. Thus, vibration suppression system is required and fluid viscous damper (FVD) is implemented to suppress such vibration in this study. The vibration behavior of frame-structural tower with FVD (F-FVD) is investigated by an equivalent model combined with experiment under seismic and wind loads, respectively, and the vibration suppression effect is evaluated by the displacement and energy distribution. The equivalent model of the frame-structural tower with FVD is primarily established, of which FVD is considered through Kelvin model. The parameters of FVD are supplemented to the damping term through a time-dependent damping matrix based in Rayleigh damping, and to the stiffness term through a stiffness matrix based in stiffness-equivalent simply-supported beam. Van der Pol wake oscillator is considered as the wind force term. Several conventional numerical integration methods for solving the equivalent model which belongs to the nonlinear system are compared and Newmark-β algorithm is adopted. The vibration suppression regularity of normalized stiffness coefficient Kr, damping coefficient Cr and velocity exponent α is analyzed via the equivalent model. There is a balance between the stiffness effect and energy dissipation effect of FVD, and the sensitiveness to α depends on excitation and stiffness of F-FVD system. The optimal parameters of fluid viscous damper, Kr = 1.30∼2.0, Cr = 1.65∼3.30 and α = 0.4∼0.8, are obtained eventually. It is indicated that the vibration suppression by fluid viscous damper is effective. And this study can be conducive to vibration suppression design of such flexible and skyscraping frame-structural tower.","PeriodicalId":174920,"journal":{"name":"Volume 5: High-Pressure Technology; Rudy Scavuzzo Student Paper Symposium and 27th Annual Student Paper Competition; ASME Nondestructive Evaluation, Diagnosis and Prognosis Division (NDPD)","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129854237","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Understanding Lift Force Discontinuity of Pressure Safety Valve 对压力安全阀升力不连续的认识
Chaoyong Zong, F. Zheng, Xueguan Song
{"title":"Understanding Lift Force Discontinuity of Pressure Safety Valve","authors":"Chaoyong Zong, F. Zheng, Xueguan Song","doi":"10.1115/pvp2019-93781","DOIUrl":"https://doi.org/10.1115/pvp2019-93781","url":null,"abstract":"\u0000 A pressure safety valve (PSV) is a safety valve designed to protect a vessel or a system during an overpressure event. For pressure safety valve to perform its function, the lift force as one of the key factors influencing the overall performance must be predicted. However, the lift force shows discontinuity with the increase of the valve opening under certain situations. This discontinuity could cause a series of problems, such as dynamic instability. In order to deeply explore the mechanism of the discontinuities numerical and experimental investigation were performed on a direct operated PSV in this paper. A test rig was constructed to measure the steady state lift forces at different valve openings. The working fluid was air and the valve body was removed. To obtain the details of the flow inside the valve, a series of computational fluid dynamics (CFD) simulations were conducted. The simulation indicated that the changing flow pattern is the main cause of the lift force discontinuity and the flow pattern is very sensitive to the valve nozzle thickness and the position of the adjustment ring. Thus, the lift force discontinuity could be weakened or even eliminated by proper valve design.","PeriodicalId":174920,"journal":{"name":"Volume 5: High-Pressure Technology; Rudy Scavuzzo Student Paper Symposium and 27th Annual Student Paper Competition; ASME Nondestructive Evaluation, Diagnosis and Prognosis Division (NDPD)","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115826268","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Improving Fatigue Properties of High Pressure Tubes in TP316L Compared to Sandvik HP120 与Sandvik HP120相比,TP316L高压管疲劳性能的改善
T. Froböse
{"title":"Improving Fatigue Properties of High Pressure Tubes in TP316L Compared to Sandvik HP120","authors":"T. Froböse","doi":"10.1115/pvp2019-93633","DOIUrl":"https://doi.org/10.1115/pvp2019-93633","url":null,"abstract":"\u0000 High pressure tubes are used in many industrial applications. Examples are “waterjet cutting” and “hydrogen fuel handling”. In “high pressure application’s”, pressures are handled around 800 bar. The tube dimension 9,53 mm × 3,16 mm is a typical “high pressure” dimension. This dimension can be found in many “waterjet cutting machines”.\u0000 Tube is a important component in any “high pressure application”. Tubes are typically used in a fatigue environment. The tube needs to survive a certain number of pressure cycles. It is important to increase the number of “cycles” to extend the lifetime of the tube and as a result, the lifetime of the equipment. Higher lifetime rates greatly reduce planned maintenance and reduce risk of unplanned equipment breakdowns.\u0000 The investigation and development to increase the fatigue properties on existing grades (mainly TP316L is this example) is a foundation to the development of a “new high pressure grade” with specific mechanical Properties.\u0000 In order to prove the fatigue properties fatigue tests have been carried out under synchronized conditions, using different tubes in comparison grades. In the production of seamless tubes, there are different production methods to create different material properties. Combinations of these methods for each grade are tested and results measured relating to grain size, defect level and surface surface condition are recorded.\u0000 The test tubes are produced in different production flow with different surface conditions to develop a comparison between surface conditions and the resulting fatigue related results. Two different grades TP316L and HP120 have been used to prove the test results in combination to material grades.\u0000 Different tube samples run on a fatigue test bench. The test pressure is set at 3.000 bar with a sinus curve at 6 Hz.\u0000 The results give a development guideline to reach the most advanced tube product for fatigue related applications.","PeriodicalId":174920,"journal":{"name":"Volume 5: High-Pressure Technology; Rudy Scavuzzo Student Paper Symposium and 27th Annual Student Paper Competition; ASME Nondestructive Evaluation, Diagnosis and Prognosis Division (NDPD)","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132934544","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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