International Journal of Pressure Vessels and Piping最新文献_第5页

Microstructure, hardness and creep properties for P91 steel after long-term service in a ultra-supercritical power plant P91 钢在超超临界发电厂长期使用后的微观结构、硬度和蠕变特性

IF 3 2区工程技术

International Journal of Pressure Vessels and Piping Pub Date : 2024-09-19 DOI: 10.1016/j.ijpvp.2024.105330

Xiaoxiang Sun , Chang Che , Gong Qian , Xue Wang

{"title":"Microstructure, hardness and creep properties for P91 steel after long-term service in a ultra-supercritical power plant","authors":"Xiaoxiang Sun , Chang Che , Gong Qian , Xue Wang","doi":"10.1016/j.ijpvp.2024.105330","DOIUrl":"10.1016/j.ijpvp.2024.105330","url":null,"abstract":"<div><div>3 P91 pipes enduring 5∼6 × 10<sup>4</sup> h service had been found in an ultra-supercritical power plant. Hardness tests, microstructure observation(OM, SEM/EBSD, TEM/EDS) and creep rupture tests were performed, and the relationship between hardness, microstructure and creep rupture strength were discussed. Results showed that 1 of the 3 pipes still featured lath martensite, and its mechanical properties complied with relevant criteria. Other 2 pipes were characteristic of a mixture of ferrite and highly recovered martensite. Their hardness and creep rupture strength experienced severe degradation. Laves phase was observed in all 3 pipes. The most distinctive feature of the 2 low hardness pipes was their coarse and intragranularly distributed M<sub>23</sub>C<sub>6</sub>. This might be caused by abnormal heat treatments which could lead to the mixed microstructure of martensite and ferrite, and this kind of microstructure would degrade fast during service. Thus the low hardness had nothing to do with the precipitation of Laves phase.</div></div>","PeriodicalId":54946,"journal":{"name":"International Journal of Pressure Vessels and Piping","volume":"212 ","pages":"Article 105330"},"PeriodicalIF":3.0,"publicationDate":"2024-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142311024","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Prediction of the internal corrosion rate for oil and gas pipelines and influence factor analysis with interpretable ensemble learning 石油和天然气管道内部腐蚀率预测以及可解释集合学习的影响因素分析

IF 3 2区工程技术

International Journal of Pressure Vessels and Piping Pub Date : 2024-09-19 DOI: 10.1016/j.ijpvp.2024.105329

Jinlong Hu

{"title":"Prediction of the internal corrosion rate for oil and gas pipelines and influence factor analysis with interpretable ensemble learning","authors":"Jinlong Hu","doi":"10.1016/j.ijpvp.2024.105329","DOIUrl":"10.1016/j.ijpvp.2024.105329","url":null,"abstract":"<div><div>Corrosion is one of the major threats to the safety and reliability of oil and gas pipelines, making accurate prediction of corrosion rate crucial for pipeline maintenance and repairment. Traditional prediction methods often ignore more critical factors and lack interpretability, which hinders the practical application. Here, an interpretable ensemble machine learning framework is proposed, not only improving prediction performance, but also enhancing interpretability for predicting the internal corrosion rate of oil and gas pipelines. In this work, ExtraTreeRegression model has demonstrated superior prediction accuracy relative to the other five machine learning models, and the determination coefficient of the ExtraTreeRegression model achieves 0.93 after feature engineering. Then, Shapley Additive exPlanations (SHAP) values is utilized to visually interpret the model locally and globally to help account for the contributions of the input features. Furthermore, the accumulated local effect (ALE) successfully explains how the features affect the internal corrosion rate of oil and gas pipelines. By collecting corrosion data of oil and gas pipeline and performing feature engineering and data preprocessing, we construct a comprehensive and reliable prediction model with interpretability. Experimental results demonstrate that the proposed interpretable ensemble machine learning approach outperforms other models in both accuracy and interpretability, providing valuable insights for pipeline management decisions.</div></div>","PeriodicalId":54946,"journal":{"name":"International Journal of Pressure Vessels and Piping","volume":"212 ","pages":"Article 105329"},"PeriodicalIF":3.0,"publicationDate":"2024-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142357126","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Identification of coating layer pipeline defects based on the GA-SENet-ResNet18 model 基于 GA-SENet-ResNet18 模型的涂层管道缺陷识别

IF 3 2区工程技术

International Journal of Pressure Vessels and Piping Pub Date : 2024-09-18 DOI: 10.1016/j.ijpvp.2024.105327

Shuaishuai Wang , Wei Liang , Fang Shi

{"title":"Identification of coating layer pipeline defects based on the GA-SENet-ResNet18 model","authors":"Shuaishuai Wang , Wei Liang , Fang Shi","doi":"10.1016/j.ijpvp.2024.105327","DOIUrl":"10.1016/j.ijpvp.2024.105327","url":null,"abstract":"<div><p>Detecting damage in coated pipelines is a challenging and costly task. This study proposes a method for pipeline defect identification based on VMD-DWT noise reduction and GA-SENet-ResNet18. Combining wavelet transform to convert denoised defect signals into time-frequency representations enhances the model's ability to capture both time-domain and frequency-domain features of defect signals, thereby improving its recognition capability for different types of defects. The study analyzed the feature extraction capabilities of ALexNet, GooleNet, VGG16, ResNet18, SENet-ResNet18, and GA-SENet-ResNet18 models in pipeline defect recognition. Experimental results show that SENet-ResNet18 achieved an accuracy of 0.9591 on the training set in 9m38s, significantly outperforming the first four models. GA-SENet-ResNet18 achieved 96.83 % accuracy, 96.67 % precision, 96.73 % recall, and 96.68 % F1 score in pipeline defect signal recognition. Compared to ResNet18, it improved accuracy by 2.06 %, precision by 1.94 %, recall by 2.09 %, F1 score by 2.37 %, with a reduction in time by 1m1s. The study demonstrates that the combined improvement of GA and SENet enhances ResNet18 not only in feature selection and response enhancement but also significantly improves its performance compared to traditional ResNet18 networks, making it more effective in pipeline defect recognition tasks. This research is crucial for ensuring pipeline system integrity and preventing pipeline accidents.</p></div>","PeriodicalId":54946,"journal":{"name":"International Journal of Pressure Vessels and Piping","volume":"212 ","pages":"Article 105327"},"PeriodicalIF":3.0,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142274635","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Sulfide stress corrosion cracking in L360QS pipelines: A comprehensive failure analysis and implications for natural gas transportation safety L360QS 管道中的硫化物应力腐蚀开裂：全面故障分析及对天然气运输安全的影响

IF 3 2区工程技术

International Journal of Pressure Vessels and Piping Pub Date : 2024-09-18 DOI: 10.1016/j.ijpvp.2024.105324

Xuanpeng Li , Wei Lv , Mingxing Li , Kun Zhang , Zhengyi Xu , Juntao Yuan , Tianle Liu , Sui Wang , Anqing Fu , Yaorong Feng

{"title":"Sulfide stress corrosion cracking in L360QS pipelines: A comprehensive failure analysis and implications for natural gas transportation safety","authors":"Xuanpeng Li , Wei Lv , Mingxing Li , Kun Zhang , Zhengyi Xu , Juntao Yuan , Tianle Liu , Sui Wang , Anqing Fu , Yaorong Feng","doi":"10.1016/j.ijpvp.2024.105324","DOIUrl":"10.1016/j.ijpvp.2024.105324","url":null,"abstract":"<div><p>This research investigates the severe weld failures in L360QS pipelines, which are integral to the infrastructure of high-pressure natural gas transportation systems. Even with strict compliance to engineering standards, two pivotal welds experienced sulfide stress corrosion cracking (SSCC) due to continuous exposure to hydrogen sulfide and stresses from construction activities. A comprehensive material analysis and stress simulation has been utilized, revealing a maximum stress concentration of 544.9 MPa that surpasses the yield strength of the pipeline material. This discovery prompts a reevaluation of current safety margins and underscores the urgent need for enhanced pipeline integrity management. Our findings, corroborated by stress distribution simulations, not only illuminate the complex interplay of material properties and environmental factors in SSCC but also provide a new perspective for the safe service of pipeline.</p></div>","PeriodicalId":54946,"journal":{"name":"International Journal of Pressure Vessels and Piping","volume":"212 ","pages":"Article 105324"},"PeriodicalIF":3.0,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142274634","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Failure analyses for plate monotonic/cyclic and elbow out-of-plane cyclic loading tests using the Gurson–Tvergaard–Needleman model 使用 Gurson-Tvergaard-Needleman 模型对平板单调/循环和肘部平面外循环加载试验进行破坏分析

IF 3 2区工程技术

International Journal of Pressure Vessels and Piping Pub Date : 2024-09-17 DOI: 10.1016/j.ijpvp.2024.105326

Makoto Udagawa , Kodai Hirata , Yuhei Kondo , Tadahiro Shibutani , Izumi Nakamura

引用次数: 0

Microstructure and mechanical properties of 9 % nickel steel welded joints using a CoCrNi filler wire for cryogenic storage tanks 使用钴铬镍填充焊丝的 9%镍钢低温储罐焊接接头的微观结构和机械性能

IF 3 2区工程技术

International Journal of Pressure Vessels and Piping Pub Date : 2024-09-16 DOI: 10.1016/j.ijpvp.2024.105325

Dejia Liu , Wenjun Ao , Nianlong Xue , Yanchuan Tang , Haitao Jiao , Junru Ma

{"title":"Microstructure and mechanical properties of 9 % nickel steel welded joints using a CoCrNi filler wire for cryogenic storage tanks","authors":"Dejia Liu , Wenjun Ao , Nianlong Xue , Yanchuan Tang , Haitao Jiao , Junru Ma","doi":"10.1016/j.ijpvp.2024.105325","DOIUrl":"10.1016/j.ijpvp.2024.105325","url":null,"abstract":"<div><p>A medium-entropy alloy of CoCrNi exhibits excellent cryogenic mechanical properties. It is possible to enhance the ductility of weld metal for cryogenic storage tank materials at cryogenic temperatures by employing CoCrNi alloys as filler metal. In this study, a CoCrNi multi-principal filler wire and a 308L stainless steel wire were used for welding 9 % Ni steel. The effects of the CoCrNi filler wire on the microstructure, hardness, mechanical properties, and deformation mechanisms of the weld metals were evaluated and discussed. A remarkable finding was that as the tensile temperature decreased from 298 K to 77 K, the fracture elongation of the CoCrNi joint increased by approximately 34.7 %, rather than decreasing. In contrast, a significant reduction in fracture elongation was observed in the 308L joint. The CoCrNi filler wire could promote the activation of twinning deformation in the weld metal at 77 K, thereby enhancing the ductility of the welded joints at cryogenic temperatures.</p></div>","PeriodicalId":54946,"journal":{"name":"International Journal of Pressure Vessels and Piping","volume":"212 ","pages":"Article 105325"},"PeriodicalIF":3.0,"publicationDate":"2024-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142274647","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of post weld heat treatment on microstructural and mechanical properties of martensitic heat-resistant steel weldments 焊后热处理对马氏体耐热钢焊件微观结构和机械性能的影响

IF 3 2区工程技术

International Journal of Pressure Vessels and Piping Pub Date : 2024-09-12 DOI: 10.1016/j.ijpvp.2024.105323

Yanyan Huang , Tao Huang , Siyuan Zhang , Zizhen Yang , Qinpei Liu , Yucun Zhan , Kunyang Fan , Jiankun Xiong , Jianping Yang , Yang Guo , Xiaowu Luo , Qinghua Zhou

{"title":"Effect of post weld heat treatment on microstructural and mechanical properties of martensitic heat-resistant steel weldments","authors":"Yanyan Huang , Tao Huang , Siyuan Zhang , Zizhen Yang , Qinpei Liu , Yucun Zhan , Kunyang Fan , Jiankun Xiong , Jianping Yang , Yang Guo , Xiaowu Luo , Qinghua Zhou","doi":"10.1016/j.ijpvp.2024.105323","DOIUrl":"10.1016/j.ijpvp.2024.105323","url":null,"abstract":"<div><p>Martensitic heat-resistant steel (MHRS) serves as an important structural material for manufacturing ultra-supercritical unit due to its excellent fatigue resistance and corrosion resistance. Post weld heat treatment (PWHT) is a common method for regulating the microstructure and properties of MHRS welded parts. In this work, we investigated the influence of different PWHT methods on the microstructure, mechanical properties, and room temperature creep properties of Co3W2 welded joints. The results showed that post-weld direct tempering (PWDT) or post-weld re-automatizing and tempering (PWNT) treatment significantly reduces the differences in microstructure and local mechanical properties of as-welded joints. Compared to the as-welded specimens, the PWDT and PWNT welds show lower strength and hardness, but better impact resistance. The PWNT treated welds show more homogeneous microstructure and local mechanical performance, and better tensile property and impact resistance than PWDT welds. Furthermore, the fine grain heat affected zone in PWNT welds shows the smallest strain rate sensitivity value, which implies the PWNT method may alleviate type IV brittle fracture in martensitic heat-resistant steel weldments.</p></div>","PeriodicalId":54946,"journal":{"name":"International Journal of Pressure Vessels and Piping","volume":"212 ","pages":"Article 105323"},"PeriodicalIF":3.0,"publicationDate":"2024-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142239770","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Very high cycle fatigue of austenitc stainless steels and their welds for reactor internals at ambient trmperature and 300 °C 用于反应堆内部的奥氏体不锈钢及其焊缝在环境温度和 300 °C 下的极高循环疲劳试验

IF 3 2区工程技术

International Journal of Pressure Vessels and Piping Pub Date : 2024-09-12 DOI: 10.1016/j.ijpvp.2024.105319

Marek Smaga , Tobias Daniel , Elen Regitz , Tilmann Beck , Tim Schopf , Georg Veile , Stefan Weihe , Jürgen Rudolph , Udo Fischer

{"title":"Very high cycle fatigue of austenitc stainless steels and their welds for reactor internals at ambient trmperature and 300 °C","authors":"Marek Smaga , Tobias Daniel , Elen Regitz , Tilmann Beck , Tim Schopf , Georg Veile , Stefan Weihe , Jürgen Rudolph , Udo Fischer","doi":"10.1016/j.ijpvp.2024.105319","DOIUrl":"10.1016/j.ijpvp.2024.105319","url":null,"abstract":"<div><p>The fatigue assessment of safety relevant components is of importance for ageing management with regard to safety and reliability of nuclear power plants. Austenitic stainless steels are often used for reactor internals due to their excellent mechanical and technological properties as well as their corrosion resistance. During operation reactor internals are subject to mechanical and thermo-mechanical loading which induce low cycle (LCF), high cycle (HCF) and even very high cycle (VHCF) fatigue. While the LCF behavior of austenitic steels is already well investigated the fatigue behavior in the VHCF regime has not been characterized in detail so far. Accordingly, the fatigue curves in the applicable international design codes have been extended from originally 10<sup>6</sup> to the range of highest load cycles up to 10<sup>11</sup> load cycles by extrapolation. Nevertheless, the existing data base for load cycles above 10<sup>7</sup> is still highly insufficient. The aim of the cooperative project of the Institute of Materials Science and Engineering (WKK) at RPTU Kaiserslautern-Landau, Materials Testing Institute (MPA) Stuttgart and Framatome GmbH, Germany is to create a comprehensive database up to the highest load cycles N = 2·10<sup>9</sup> for austenitic stainless steels and their welds at ambient and elevated temperature.</p></div>","PeriodicalId":54946,"journal":{"name":"International Journal of Pressure Vessels and Piping","volume":"212 ","pages":"Article 105319"},"PeriodicalIF":3.0,"publicationDate":"2024-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0308016124001960/pdfft?md5=b77ec227bdc9cba756d610dea2e84dce&pid=1-s2.0-S0308016124001960-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142173152","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Earthquake damage mitigation methods for buried pipelines under compressive loads: A case study of the Thames water pipeline 抗压荷载下埋地管道的地震破坏减缓方法：泰晤士河输水管道案例研究

IF 3 2区工程技术

International Journal of Pressure Vessels and Piping Pub Date : 2024-09-12 DOI: 10.1016/j.ijpvp.2024.105322

Ercan Serif Kaya

{"title":"Earthquake damage mitigation methods for buried pipelines under compressive loads: A case study of the Thames water pipeline","authors":"Ercan Serif Kaya","doi":"10.1016/j.ijpvp.2024.105322","DOIUrl":"10.1016/j.ijpvp.2024.105322","url":null,"abstract":"<div><p>Promoting tensile failure by providing a proper orientation angle between the pipe axis and the fault line is the main seismic design philosophy for buried steel pipelines. However, most of the severe damage and failures experienced by pipelines are mainly due to negative crossing angle and thus compressive loads acting along the pipeline. This paper investigates different earthquake damage mitigation methods such as Carbon Fiber Reinforced Polymer (CFRP) wrapped pipes, Steel Pipes for Fault Crossing (SPF), and corrugated pipes for buried steel pipelines which are mainly subjected to compressive loads. Therefore, the Thames water transmission pipeline, which is a well-known case study, that suffered major and minor damage due to compressive forces in the 1999 Kocaeli earthquake, is considered to simulate and compare the earthquake damage mitigation capabilities of these countermeasures. The numerical studies are performed by using a three-dimensional nonlinear finite element model. The results show that the use of CFRP composites in buried pipelines, regardless of their thickness, wrapping length, or layer orientation, does not have the expected damage reduction effect, but does increase the effective length between major wrinkles or change the type of pipe failure. On the other hand, SPFs and corrugated pipes are more effective in earthquake damage reduction due to their high axial and rotational capabilities.</p></div>","PeriodicalId":54946,"journal":{"name":"International Journal of Pressure Vessels and Piping","volume":"212 ","pages":"Article 105322"},"PeriodicalIF":3.0,"publicationDate":"2024-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142232654","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Experimental research on the fracture and arrest process of supercritical CO2 pipelines 超临界二氧化碳管道断裂和阻塞过程的实验研究

IF 3 2区工程技术

International Journal of Pressure Vessels and Piping Pub Date : 2024-09-11 DOI: 10.1016/j.ijpvp.2024.105314

Lei Chen , Yanwei Hu , Zhenxi Liu , Xingqing Yan , Shuai Yu , Jianfei Ding , Peiqi Liu , Jianliang Yu , Shaoyun Chen

{"title":"Experimental research on the fracture and arrest process of supercritical CO2 pipelines","authors":"Lei Chen , Yanwei Hu , Zhenxi Liu , Xingqing Yan , Shuai Yu , Jianfei Ding , Peiqi Liu , Jianliang Yu , Shaoyun Chen","doi":"10.1016/j.ijpvp.2024.105314","DOIUrl":"10.1016/j.ijpvp.2024.105314","url":null,"abstract":"<div><p>As global greenhouse gas emissions become increasingly severe, carbon capture, utilization, and storage (CCUS) technology, as a major approach for achieving carbon peak and carbon neutrality, is attracting growing attention. Pipeline networks play a crucial role in implementing CCUS technology, connecting carbon sources from capture points to storage facilities. However, pipelines are inevitably susceptible to leaks or ruptures due to various factors, which can lead to catastrophic accidents. Research on the pressure and temperature inside pipelines after the rupture of defective pipelines, as well as the mechanisms of crack propagation and diffusion behavior, forms an important foundation for risk assessment of CO<sub>2</sub> pipelines. This research will provide effective technical support for the implementation of large-scale CCUS projects and contribute to pipeline safety. In this study, an API X52 full-scale CO<sub>2</sub> pipeline rupture experiment was conducted, and data from various sensors and instruments were collected to track the pressure evolution, temperature changes in both axial and vertical directions, microscopic morphology of cracks at different locations, and the evolution of gas clouds from leakage to rupture. The developed pressure relief wave prediction model showed high consistency with experimental results, and the safe design of the experimental pipeline was conducted based on the modified Battelle two-curve method (BTCM).</p></div>","PeriodicalId":54946,"journal":{"name":"International Journal of Pressure Vessels and Piping","volume":"212 ","pages":"Article 105314"},"PeriodicalIF":3.0,"publicationDate":"2024-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142168964","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0