Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture最新文献

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A hybrid design for jointly optimizing production scheduling, control chart design and maintenance in continuous flow manufacturing 联合优化连续生产流程中的生产调度、控制图设计和维护的混合设计
IF 2.6 3区 工程技术
Qiang Wan, Ling Chen
{"title":"A hybrid design for jointly optimizing production scheduling, control chart design and maintenance in continuous flow manufacturing","authors":"Qiang Wan, Ling Chen","doi":"10.1177/09544054241238892","DOIUrl":"https://doi.org/10.1177/09544054241238892","url":null,"abstract":"Integrating the three crucial functions of quality control, economic production quantity (EPQ) and maintenance leads to cost savings and increased efficiency for manufacturing processes. While in the literature, they have typically been studied separately. Moreover, most of the existing integration models are designed for the discrete piece-part manufacturing environment. This study, nevertheless, focuses wholly on continuous flow manufacturing (CFM), which is distinctly different from piece-part manufacturing, as the sampling unit is described in light of laboratory requirements instead of the production unit. Based on this fact, this paper proposes an integrated EPQ scheme jointly designed with control-chart design and maintenance planning for the CFM process. A developed genetic algorithm is employed to minimize the expected total production cost under constraints on the economic-statistical quality. Of the costs considered, quality-related costs are quantified via an approximate formula derived from the quality loss curve depending on Taguchi’s quality loss function. A sensitivity analysis is performed on the expected total production cost and variations in the chosen system parameter values to offer insights into the issue. Finally, a comparative investigation of the suggested model and two similar models that contributed to this field is conducted.","PeriodicalId":20663,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture","volume":null,"pages":null},"PeriodicalIF":2.6,"publicationDate":"2024-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140371680","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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
LIFNS: Design of a novel Lidar-IMU fusion navigation system for AGVs in smart factories LIFNS:为智能工厂中的 AGV 设计新型激光雷达-IMU 融合导航系统
IF 2.6 3区 工程技术
Yiduo Li, Peiqing Li, Qipeng Li, Xinzhao Wu, Zhuoran Li
{"title":"LIFNS: Design of a novel Lidar-IMU fusion navigation system for AGVs in smart factories","authors":"Yiduo Li, Peiqing Li, Qipeng Li, Xinzhao Wu, Zhuoran Li","doi":"10.1177/09544054241238793","DOIUrl":"https://doi.org/10.1177/09544054241238793","url":null,"abstract":"Traditional Automated Guided Vehicle (AGV) robots commonly employ 2D plane navigation systems. However, with the expansion of AGV application scenarios and the increasing complexity of structures, the limitations of existing 2D navigation systems have become more pronounced, rendering them inadequate for addressing these challenges. To tackle this issue, this paper proposes a novel navigation system suitable for AGV robots composed of fused Lidar and Inertial Measurement Unit (IMU), named as Lidar-IMU Fusion Navigation System (LIFNS). LIFNS primarily comprises mapping, localization, and fused path planning modules. In the mapping module, a 3D point cloud map for precise 3D localization and a 2D grid map for path planning are constructed using multiple-line Lidar and IMU. For the localization module, a fusion localization approach is introduced, combining IMU data with Normal Distributions Transform (NDT) point cloud registration through Unscented Kalman Filtering (UKF). Finally, global path planning is executed using the A* algorithm on the grid map, while local path planning utilizes the Timed-Elastic Band (TEB) algorithm. The effectiveness and universality of LIFNS are validated through simulation experiments and real-world deployment tests. The experimental results demonstrate that LIFNS achieves centimeter-level accuracy in both mapping and localization, effectively alleviating the issues of low precision and significant limitations present in traditional AGV robots. This positions LIFNS with promising applications in enclosed settings such as smart factories, industrial parks, and healthcare facilities.","PeriodicalId":20663,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture","volume":null,"pages":null},"PeriodicalIF":2.6,"publicationDate":"2024-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140372072","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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
Study on the processing characteristics of aluminum honeycomb core by longitudinal torsional composite ultrasonic vibration-assisted cutting 纵向扭转复合超声波振动辅助切割铝蜂窝芯加工特性研究
IF 2.6 3区 工程技术
Jie Zhang, Yingshuai Xu, Xiaoyang Chen, Yangyuan Zuo, Hengxue Yan, Shanli Xiong
{"title":"Study on the processing characteristics of aluminum honeycomb core by longitudinal torsional composite ultrasonic vibration-assisted cutting","authors":"Jie Zhang, Yingshuai Xu, Xiaoyang Chen, Yangyuan Zuo, Hengxue Yan, Shanli Xiong","doi":"10.1177/09544054241239700","DOIUrl":"https://doi.org/10.1177/09544054241239700","url":null,"abstract":"Aluminum honeycomb has been widely used in various industrial sectors due to its exceptional physical properties. Ultrasonic vibration machining shows significant potential in reducing machining defects. Therefore, this study employs ultrasonic vibration assisted cutting (UVC) to process aluminum honeycomb core and compares cutting force, surface morphology, and cutting defects with the conventional cutting (CC). This investigation assesses the impact of processing parameters such as feed rate and cutting depth on both UVC and CC. The results indicate that, in comparison to CC, UVC can notably reduce cutting force, minimize tearing burrs and cell deformation defects, and achieve superior surface morphology. Furthermore, the study reveals that cutting force increases with higher tool feed rates and cutting depths. Cell deformation also escalates with increased tool feed rates and cutting depths, and tearing burrs become more pronounced with deeper cuts. Excessively shallow cutting depths can lead to a sudden increase in node defects. Simultaneously, tearing burrs and cell deformation exhibit different characteristics under CC and UVC.","PeriodicalId":20663,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture","volume":null,"pages":null},"PeriodicalIF":2.6,"publicationDate":"2024-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140379441","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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
Non-circular interference fit analysis in harmonic reducer based on sequential assembling and loading simulation 基于顺序装配和加载模拟的谐波减速器非圆形干涉配合分析
IF 2.6 3区 工程技术
Ying Xiong, B. Fang, Jinhua Zhang, Ke Yan, Delin Liao, Jun Hong
{"title":"Non-circular interference fit analysis in harmonic reducer based on sequential assembling and loading simulation","authors":"Ying Xiong, B. Fang, Jinhua Zhang, Ke Yan, Delin Liao, Jun Hong","doi":"10.1177/09544054241236999","DOIUrl":"https://doi.org/10.1177/09544054241236999","url":null,"abstract":"The flexible bearing is usually connected to the cam with an interference fit in harmonic reducers. Studies show that interference fit can cause changes in the structural parameters of the bearing and lead to changes in the service performance of the bearing and its supporting system. This paper proposes a general simulation method to investigate the influence of interference fit in harmonic reducers with the concept of the equivalent interference for non-circular fit between the flexible bearing and cam. Then, the four steps based on the sequential assembling and loading process are designed to ensure assembly concentricity and simulation convergence. The analysis results indicate that appropriately increasing the equivalent interference can improve the service life of the flexspline without degrading the meshing performance and, at the same time, increase the number of loaded balls to make the operation of the harmonic reducer more stable. Moreover, an optimal equivalent interference can be designed to ensure the harmonic reducer operates at its best, where the number of loaded balls and the maximum Mises stress of the inner ring appear inflection point, and the number of meshing tooth pairs reaches the maximum.","PeriodicalId":20663,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture","volume":null,"pages":null},"PeriodicalIF":2.6,"publicationDate":"2024-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140377716","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 study on ultrasonic assisted milling effect on blade distortion 超声波辅助铣削对刀片变形影响的实验研究
IF 2.6 3区 工程技术
Masuod Bayat, Saeid Amini
{"title":"Experimental study on ultrasonic assisted milling effect on blade distortion","authors":"Masuod Bayat, Saeid Amini","doi":"10.1177/09544054241235736","DOIUrl":"https://doi.org/10.1177/09544054241235736","url":null,"abstract":"Distortion in milling is a prevalent issue that can arise during material machining. It stems from the forces exerted by the cutting tool on the machined material, resulting in uneven material removal and subsequent warping of the parts. The distortion can be prevented with proper cutting speed, feed rate, and tool selection. Ultrasonic-Assisted Milling (UAM) mitigates distortion in milling processes by optimizing cutting conditions. This machining technique employs high-frequency vibrations to efficiently remove material from a workpiece. In this study, 18 tests according to a full factorial design experiment were used to investigate cutting force and distortion in two modes of conventional milling and ultrasonic-assisted milling. Our findings reveal a direct correlation between cutting force and distortion in UAM. Specifically, UAM exhibited a significant reduction of approximately 28.4% in cutting force compared to conventional milling (CM). Furthermore, distortion in UAM was diminished by about 34.06%. Additionally, a noteworthy improvement of 28.4% in surface roughness was observed. These results collectively help produce accurate workpieces and ensure the production of undamaged and warp-free parts.","PeriodicalId":20663,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture","volume":null,"pages":null},"PeriodicalIF":2.6,"publicationDate":"2024-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140379177","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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
Synthesis and characterization of open cell Ni-Cr foam developed using Pulse electro deposition technique for filtration applications 利用脉冲电沉积技术开发的用于过滤应用的开孔镍铬泡沫的合成与表征
IF 2.6 3区 工程技术
Raj Kumar Pittala, Priyaranjan Sharma, Gajanan Anne, J. Arab, D. Unune, Ch Sateesh Kumar, Filipe Fernandes
{"title":"Synthesis and characterization of open cell Ni-Cr foam developed using Pulse electro deposition technique for filtration applications","authors":"Raj Kumar Pittala, Priyaranjan Sharma, Gajanan Anne, J. Arab, D. Unune, Ch Sateesh Kumar, Filipe Fernandes","doi":"10.1177/09544054241238908","DOIUrl":"https://doi.org/10.1177/09544054241238908","url":null,"abstract":"Nickel–Chromium (Ni-Cr) foam is a highly versatile material, combining excellent high-temperature and corrosion resistance with lightweight and energy absorption properties, making it a popular choice for a wide range of applications. This study explores the development of Ni-Cr foam using Pulse electrodeposition techniques, specifically ultrasonic-assisted pulse electroplating of nickel (UAPEPN) and ultrasonic-assisted pulse electroplating of chromium (UAPEPCr). The study evaluates the surface morphology, coating thickness and minimum mass gain of Ni-Cr foam after each process. A dedicated test rig was designed to measure the pressure drop across the foam, revealing a pressure drop of 0.29 bar at an input pressure of 70 PSI and a flow rate of 17.53 LPM of oil. The porosity percentage and permeability of the foam were evaluated at each developmental stage, with values noted as 91% and 1.0032 × 10−8 m2, respectively, after the UAPEPCr stage. Uniaxial tensile and compression tests were conducted to measure the foam’s maximum strength and energy absorption per unit volume, yielding valuable insights into the material’s performance characteristics.","PeriodicalId":20663,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture","volume":null,"pages":null},"PeriodicalIF":2.6,"publicationDate":"2024-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140385067","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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
Toward understanding the damage behavior during orthogonal cutting of 2.5D C/SiC composite based on multi-scale modeling and high-speed photography 基于多尺度建模和高速摄影,了解 2.5D C/SiC 复合材料正交切削过程中的损伤行为
IF 2.6 3区 工程技术
Chang Liu, Zhaoxin Hou, Jintong Zhang, Tao Yang
{"title":"Toward understanding the damage behavior during orthogonal cutting of 2.5D C/SiC composite based on multi-scale modeling and high-speed photography","authors":"Chang Liu, Zhaoxin Hou, Jintong Zhang, Tao Yang","doi":"10.1177/09544054241235743","DOIUrl":"https://doi.org/10.1177/09544054241235743","url":null,"abstract":"2.5D C/SiC composite has been a critical high temperature material for aerospace filed due to its excellent wear, high temperature and oxidation resistance. Understanding the cutting damage behavior is crucial for achieving the high reliability application. This paper presents an in-depth study on damage behavior and material removal mechanism during orthogonal cutting of 2.5D C/SiC composite based on multi-scale modeling and high-speed photography. A three-dimensional numerical micro-macro multi-scale model is established considering the characteristics of the brittle SiC matrix, the isotropic carbon fiber reinforcement, and the pyrolytic carbon (PyC) layer. The orthogonal cutting experiments of 2.5D C/SiC composite with high-speed photography technology is carried out. The results show that the proposed model can accurately predict the microscopic deformation and fracture of the fiber. Meanwhile, surface fiber spring-back phenomenon is found based on high-speed photography, and its mechanism is first explanation based on the stress evolution analysis of the multi-scale model. In addition, it indicates that the increase of the depth of cut has a significant impact on the chip shape evolution, transitioning from powdery, needle-like, to block-like or strip-like shape. The paper covers some new sights for low-damage cutting of 2.5D C/SiC composite materials.","PeriodicalId":20663,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture","volume":null,"pages":null},"PeriodicalIF":2.6,"publicationDate":"2024-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140217647","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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
Surface burn prevention based on the probability control of pulses with ignition delay in WEDM 基于带点火延迟的脉冲概率控制的线切割放电加工(WEDM)表面烧伤预防技术
IF 2.6 3区 工程技术
Hongwei Pan, Zhidong Liu, Cong Deng
{"title":"Surface burn prevention based on the probability control of pulses with ignition delay in WEDM","authors":"Hongwei Pan, Zhidong Liu, Cong Deng","doi":"10.1177/09544054241238027","DOIUrl":"https://doi.org/10.1177/09544054241238027","url":null,"abstract":"This study aims to address surface burn and increased probability of wire breakage under high-energy cutting conditions in wire electrical discharge machining (WEDM). Firstly, the causes of surface burns are investigated, revealing that the deterioration of cooling, debris removal, and deionization status in the machining gap are the dominating factors. Maintaining a certain ratio of pulse to ignition delay is essential for proper discharge machining. Secondly, a servo control strategy based on the pulse probability of ignition delay is proposed. When the target probability is preset to 25%, the machining stability is significantly improved, preventing surface burns and decreasing the probability of wire breakage. With this servo control, the maximum average machining current free of surface burn is raised from 6 to 8 A. As a result, the max cutting speed is improved by 24%, and the tensile strength of the wire electrode is enhanced by 23.5%. In addition, the machined surface area increases by 22% when the diameter wear of the wire electrode reaches 0.01 mm. The new servo control has been demonstrated to be effective in facilitating machining efficiency and extending wire electrode durability in WEDM.","PeriodicalId":20663,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture","volume":null,"pages":null},"PeriodicalIF":2.6,"publicationDate":"2024-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140218972","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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
A new statistical-quality-control methodology for panel line monitoring in shipyards 用于船厂板线监测的新统计质量控制方法
IF 2.6 3区 工程技术
D. Maisano, L. Mastrogiacomo, F. Franceschini, Salvatore Capizzi, Gianandrea Pischedda, Daniele Laurenza, Giorgio Gomiero, Giuseppe Manca
{"title":"A new statistical-quality-control methodology for panel line monitoring in shipyards","authors":"D. Maisano, L. Mastrogiacomo, F. Franceschini, Salvatore Capizzi, Gianandrea Pischedda, Daniele Laurenza, Giorgio Gomiero, Giuseppe Manca","doi":"10.1177/09544054241235742","DOIUrl":"https://doi.org/10.1177/09544054241235742","url":null,"abstract":"The construction of cruise ship hulls is a complex process that involves various stages: it begins with the fabrication of panels, which involves marking, cutting, and shaping metal plates of considerable length, followed by the welding of rigid structural components onto these panels. To minimize delays and cost overruns, it is crucial to detect any anomalies early on and rectify them through appropriate repair work. Therefore, real-time conformity verifications and effective Statistical Quality Control (SQC) methodologies are necessary. This paper proposes a novel SQC methodology, specifically tailored for monitoring the panel line in cruise-ship shipyards. This methodology, while adopting a traditional standardized p control chart with samples of variable size, integrates two original aspects: (i) it accounts for the significant level of customization and specific quality characteristics inherent in the different panels and (ii) it rigorously considers the measurement uncertainty associated with the large-volume metrology instruments (such as state-of-the-art total stations, laser trackers or laser scanners) used for conformity verification, following the ISO 14253-1:2017 standard. The methodology is exemplified through a real-world case study, providing practical insights into its application.","PeriodicalId":20663,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture","volume":null,"pages":null},"PeriodicalIF":2.6,"publicationDate":"2024-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140227360","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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
Investigation on the modeling and simulation of hydrodynamics in asymmetric conduction laser micro-welding of austenitic stainless steel and its process optimization 奥氏体不锈钢非对称传导激光微焊接流体力学建模与仿真及其工艺优化研究
IF 2.6 3区 工程技术
José Luis Velázquez de la Hoz, Kai Cheng
{"title":"Investigation on the modeling and simulation of hydrodynamics in asymmetric conduction laser micro-welding of austenitic stainless steel and its process optimization","authors":"José Luis Velázquez de la Hoz, Kai Cheng","doi":"10.1177/09544054241235839","DOIUrl":"https://doi.org/10.1177/09544054241235839","url":null,"abstract":"Laser micro-welding is a joining technology utilized across various high-value industries, like medical, automotive, e-mobility, and aerospace. A trial-and-error process to identify welding parameters does not necessarily lead to optimized quality levels. Furthermore, offline non-destructive examination methods often launched to verify welding quality may inadvertently trigger excessive costs and time delays, ultimately failing to guarantee defect-free welds. In response to these challenges, this article introduces an advanced multiscale model designed to unravel the intricate dynamics of hydrodynamics and the overarching physics within laser micro-welding melting pools. Developed using the COMSOL software package, the model adeptly demonstrates how surface tension gradients shape the geometry of welds, thus influencing their quality. This knowledge allows the mapping of welding defects. One of the novelties of the article is to introduce geometric dissimilar welding conditions by simulating an asymmetric edge joint. It shows a study on a new, unstudied way to laser weld with many applications in the field. The model further establishes its utility in design experiments to determine parameter, tolerance, and system design. Moreover, the insights garnered from understanding and controlling these drivers have far-reaching implications for the advancement of subsequent methodological research and the development of in-situ quality control practices by characterizing the welding defects. Finally, the results shows that the discouragingly high computational costs restrict its potential application to support a Digital Twin.","PeriodicalId":20663,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture","volume":null,"pages":null},"PeriodicalIF":2.6,"publicationDate":"2024-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140228289","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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
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