Journal of Manufacturing Processes最新文献

{"title":"Study on microstructural evolution of near-net shape forging process of AA6082 wheel – Dynamic recrystallization and processing map analysis","authors":"Imang Eko Saputro ,&nbsp;Chun-Nan Lin ,&nbsp;Intan Mardiono ,&nbsp;Hsuan-Fan Chen ,&nbsp;Junwei Chen ,&nbsp;Marlon Ho ,&nbsp;Yiin-Kuen Fuh","doi":"10.1016/j.jmapro.2024.11.006","DOIUrl":"10.1016/j.jmapro.2024.11.006","url":null,"abstract":"<div><div>The hot deformation behavior of AA6082 was investigated through isothermal compression tests performed within a temperature range of 350 °C to 560 °C and a strain rate range of 0.05 to 15 s⁻¹ to replicate the actual process of a wheel near-net shape forging process using finite element (FE)-based numerical simulations. The near-net shape forging technology of an AA6082 commercial wheel consists of three stages: preforming, rough forging, and finish forging. The constitutive model of flow stress data was numerically integrated using a novel strategy that incorporates nonlinear regression methods on the mathematical models of up-to-peak, dynamic recovery (DRV), and dynamic recrystallization (DRX) behaviors of the material during isothermal compression tests. A processing map analysis was established based on the flow stress data, and the obtained parameters, such as power dissipation efficiency and instability, were integrated into the numerical model using trilinear interpolation with a clamping method. The primary contribution of this study is to evaluate the effectiveness of the numerically integrated processing map parameters in predicting microstructural grain evolutions during the wheel near-net shape forging process. Microstructures of the material in several areas of the workpiece after each forging stage were examined using an optical microscope. Subsequently, the Johnson-Mehl-Avrami-Kolmogorov (JMAK) numerical model of dynamic grain size was derived from a combination of experimental observations and numerical processing parameters to establish a prediction of average grain size in all areas of the workpieces during each stage. Overall results demonstrate that the new strategy employed in constitutive modeling is practical, efficient, and highly accurate in modeling the high-noise flow stress curves of AA6082 material, achieving an average absolute relative error of 1.88 %. The new numerical model for average grain size prediction closely aligns with experimental measurements, exhibiting errors below 6 % in most observation areas. However, one area was identified with a 12.88 % error, attributed to a grain growth defect. The new numerical simulation results of processing map parameters are promising in predicting recrystallization conditions and accurately identifying defect-prone areas. Ultimately, the near-net shape forging technology successfully refined the grain size on the wheel by 53.42 % to 61.66 %, and the uniformity of grain size increased to 92.43 % and 95.46 % after the rough and finish forging processes, respectively.</div></div>","PeriodicalId":16148,"journal":{"name":"Journal of Manufacturing Processes","volume":"132 ","pages":"Pages 629-658"},"PeriodicalIF":6.1,"publicationDate":"2024-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142657321","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Regulation of drop-on-demand e-jet printing based on minimum pulse width and critical frequency","authors":"Jinwei Li ,&nbsp;Zongkun Lao ,&nbsp;Lin Li,&nbsp;Shuoyi Xu,&nbsp;Yuanfen Chen,&nbsp;J. Li,&nbsp;Z. Lao,&nbsp;L. Li,&nbsp;S. Xu,&nbsp;Pro.Y. Chen","doi":"10.1016/j.jmapro.2024.11.014","DOIUrl":"10.1016/j.jmapro.2024.11.014","url":null,"abstract":"<div><div>Drop-on-demand E-Jet printing enables the precision preparation of micro- and nanodots, which has great applications in micro/nanostructure fabrications. However, to accurately regulate the size of the printed dots is still a challenge. In this paper, we propose a method to control the diameter of the E-Jet printed dots by predicted pulse width and jetting number based on the minimum pulse width and critical frequency, achieving precise dot size regulation within one single pulse width. Firstly, relationship between process parameters and Taylor cone formation time <em>T</em>_<em>f</em><em>,</em> liquid jetting time <em>T</em>_<em>j</em><em>,</em> meniscus retraction time <em>T</em>_<em>r</em>, minimum pulse width <em>T</em>_<em>pwm</em>, as well as critical frequency <em>f</em>_<em>c</em> are systematically studied. Then the relationship between pulse width and jetting number within on pulse cycle is established. Subsequently, the random forest regression (RFR) model is applied to predict the minimum pulse width and critical frequency. The predicted pulse widths for desired numbers of jets are applied to print microdot arrays of different sizes. This proposed real drop-on-demand E-Jet printing method could be applied to micro- and nanostructure fabrications for flexible electronics and printed electronics.</div></div>","PeriodicalId":16148,"journal":{"name":"Journal of Manufacturing Processes","volume":"132 ","pages":"Pages 712-720"},"PeriodicalIF":6.1,"publicationDate":"2024-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142657326","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A globally smooth tool path reconstruction method for the ultra-precision diamond turning of microlens arrays","authors":"Yangqin Yu,&nbsp;Hao Wu,&nbsp;Zhiyue Wang,&nbsp;Junnan Chen,&nbsp;Xinquan Zhang,&nbsp;Mingjun Ren,&nbsp;Limin Zhu","doi":"10.1016/j.jmapro.2024.11.023","DOIUrl":"10.1016/j.jmapro.2024.11.023","url":null,"abstract":"<div><div>Microlens arrays have been widely used in industry and extensively researched in academia over the years. Lens arrays machined by slow and fast tool servo technologies commonly suffer from vibration marks near lens edges, which undermine surface finish and from accuracy. The vibration marks are caused by the machine tool's nonlinear response to abnormally large local tool path accelerations at lens edges. In this study, a globally smooth tool path reconstruction method based on frame line guided cubic spline interpolation is proposed. The incorporation of globally continuous frame lines is demonstrated to significantly improve both tangential and radial tool path smoothness. Comparative theoretical analysis and experimental investigation are conducted together with direct strategy and tangentially smooth strategy. Experimental results show significant suppression in vibration marks, a 43.8 % decrease in surface roughness Sa, and a 63.0 % decrease in form error PV compared to the direct strategy. And equal results are acquired using the proposed method with twice the efficiency of the direct method. Moreover, the nonuniformity of surface topography in a single lens resulting from the periodic cutting-in motions is also observed, explained and effectively reduced in this study.</div></div>","PeriodicalId":16148,"journal":{"name":"Journal of Manufacturing Processes","volume":"132 ","pages":"Pages 598-614"},"PeriodicalIF":6.1,"publicationDate":"2024-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142657322","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"High-efficiency free-damage electrochemical shear-thickening polishing of single-crystal silicon carbide","authors":"Mengmeng Shen ,&nbsp;Lingwei Wu ,&nbsp;Min Wei ,&nbsp;Hongyu Chen ,&nbsp;Julong Yuan ,&nbsp;Binghai Lyu ,&nbsp;Hui Deng ,&nbsp;Suet To ,&nbsp;Tufa Habtamu Beri ,&nbsp;Wei Hang","doi":"10.1016/j.jmapro.2024.10.053","DOIUrl":"10.1016/j.jmapro.2024.10.053","url":null,"abstract":"<div><div>A novel electrochemical shear-thickening polishing (ESTP) technique was proposed and successfully applied to polish a 4H-SiC (000-1) workpiece. An in-depth investigation of the anodization mechanism was undertaken and nanoindentation experiments and X-ray photoelectron spectroscopy were conducted to analyze the physical and chemical properties of oxidation product, confirming that the oxidation product was SiO₂ and that the hardness decreased significantly from 21.07 GPa to 0.96 GPa after oxidation. The surfaces of 4H-SiC (000-1) workpieces were processed by ESTP at different voltages to study the relationship between the growth and removal rates of the oxide using scanning electron microscopy and energy dispersive spectrometry. The ideal voltage balancing the growth and removal rates of the oxide was determined to be 6 V based on Faraday's electromagnetic law. After 30 min of ESTP at 6 V, the average surface roughness <em>S</em>_a decreased significantly from 20.5 nm to 1.4 nm and the calculated material removal rate (MRR) was as high as 255.5 nm/min. Finally, the superiority of ESTP was subsequently demonstrated through a comparison with conventional shear-thickening polishing (STP) showing that ESTP exhibited an excellent polishing effect and effectively overcame the limited MRR of STP. In addition, the removal of subsurface damage was observed during the polishing process and confirmed by transmission electron microscopy. The observed phenomena demonstrate the efficient and nondestructive nature of the proposed ESTP technique, which represents an ideal polishing technology for hardy and brittle materials such as SiC.</div></div>","PeriodicalId":16148,"journal":{"name":"Journal of Manufacturing Processes","volume":"132 ","pages":"Pages 532-543"},"PeriodicalIF":6.1,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142657382","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"An efficient surrogate model for prediction of stress released distortion in large blade machining","authors":"Zhengtong Cao ,&nbsp;Weihao Xu ,&nbsp;Tao Huang,&nbsp;Yu Lv,&nbsp;Xiao-Ming Zhang,&nbsp;Han Ding","doi":"10.1016/j.jmapro.2024.10.066","DOIUrl":"10.1016/j.jmapro.2024.10.066","url":null,"abstract":"<div><div>Deformation during the machining of large turbine blades based on a forged blank is always inevitable and unpredictable because of the individual difference in residual stress of the blanks. Compensation and control of the machining deformation is of great challenge since non-destructive measurement and accurate modeling of the distributed residual stress of complex surfaces are unavailable. To this end, this paper constructs a novel data-driven model based on the U-Koopman neural operator, which is an improvement of the Koopman neural operator to describe the relationship between the deformation after the current cutting stage and that of the next cutting stage. To avoid expensive experiments and tests, the finite element method is utilized to simulate the continuous multi-processes machining of large blades, which contains residual stress generation during forging process and deformation generation during cutting process, and then construct the dataset for model training. Cross-validation is implemented to verify the superior generalization ability of the proposed model over the benchmark models and the effectiveness of the related improvements of the model based U-Koopman neural operator. The results of case study show that the proposed model can predict and compensate for the deformation in-process and improve the machining accuracy and efficiency of large blades.</div></div>","PeriodicalId":16148,"journal":{"name":"Journal of Manufacturing Processes","volume":"132 ","pages":"Pages 544-557"},"PeriodicalIF":6.1,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142657381","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The generation mechanism of cutting heat and the theoretical prediction model for temperature on the rake face of the cutting tool in Zirconia ceramics","authors":"Yang Sun ,&nbsp;Lianjie Ma ,&nbsp;Jing Jia ,&nbsp;Yanqing Tan ,&nbsp;Shuyu Qi ,&nbsp;Benjia Tang ,&nbsp;Hongshuang Li ,&nbsp;Yunguang Zhou","doi":"10.1016/j.jmapro.2024.11.013","DOIUrl":"10.1016/j.jmapro.2024.11.013","url":null,"abstract":"<div><div>Cutting temperature and its distribution are crucial factors influencing tool strength and wear rate, due to the hardness and brittleness of Zirconia (Z_rO₂) ceramics, significant challenges arise in both direct temperature measurement in the cutting zone and theoretical analysis of cutting heat. Thus, focusing on the turning characteristics of Z_rO₂ ceramics, this study analyzes the mechanism of cutting heat generation and proposes utilizing thermodynamic state equations to determine the cutting heat source on rake face of tool. Based on the heat source method, a theoretically prediction model for temperature distribution on rake face is established. This model considers primary cutting parameters, workpiece material properties, crack fracture characteristics of the machined surface, and thermal characterizations of the tool material. The relationship between tool wear and cutting temperature is experimentally analyzed to determine the characteristic temperature that indicates the initial stage of tool wear. The validity of the theoretical model is verified, as the predicted results show high consistency with experimental results within the range of experimental parameters, with a relative error within 15.2 %.The results reveal the highest temperature during brittle cutting occurs within the cutting layer area, with the highest temperature occurring approximately 50 μm from the tool tip, followed by a gradual decrease beyond 150-200 μm. This study also demonstrates that cutting heat in ceramic turning does not solely originate from friction heat between tool flank-workpiece but also includes impact heat from tool rake face-workpiece, which under certain cutting parameters exerts a more significant influence on cutting temperature. This model can facilitate the selection and optimization of cutting process parameters for brittle materials and provide a theoretical basis for analyzing the relationship between tool thermal damage, thermophysical properties, and tool wear.</div></div>","PeriodicalId":16148,"journal":{"name":"Journal of Manufacturing Processes","volume":"132 ","pages":"Pages 584-597"},"PeriodicalIF":6.1,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142657378","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Feasibility analysis and parameter optimization of ultrasonic assisted electrolytic plasma polishing of small modulus gears","authors":"Yangjian Chen ,&nbsp;Jun Yi ,&nbsp;Huixu Song ,&nbsp;Wei Zhou ,&nbsp;Hui Deng","doi":"10.1016/j.jmapro.2024.11.022","DOIUrl":"10.1016/j.jmapro.2024.11.022","url":null,"abstract":"<div><div>Precision polishing of small modulus gears is a difficult task due to the complexity of their geometry. Electrolytic plasma polishing technology as a green and efficient processing method, it can effectively decrease the friction between parts and improve the service life. However, considering the uneven distribution of gas layers on the surface of workpieces in electrolytic plasma polishing, which affects the precision of workpiece shapes after polishing, this study proposed the use of ultrasonic vibrations to generate pressure waves to improve the fluid characteristics. Comparative experiments on small modulus gear electrolytic plasma polishing with and without ultrasonic vibration were conducted. A high-speed camera was utilized to monitor the distribution of gas layers around the workpiece during the polishing process in real-time. The optical measurement methods were used to evaluate the gear precision. The results indicate that ultrasonic assistance is beneficial in improving the uniformity of the gas layers surrounding the workpiece, achieving higher gear precision, and obtaining a lower surface roughness after polishing. Through orthogonal experiments, this study analyzed the effects of various process parameters on the surface roughness of gear profiles and the uniformity of material removal after polishing. These parameters included power voltage, polishing time, workpiece immersion depth, ultrasonic frequency, and workpiece posture angle. An optimal combination of process parameters was identified. The results show that the best surface roughness and gear precision were achieved with a power voltage of 300 V, a polishing time of 4 min, a workpiece immersion depth of about 10 mm, an ultrasonic frequency of 40 kHz, and a workpiece tilt angle of 45°.</div></div>","PeriodicalId":16148,"journal":{"name":"Journal of Manufacturing Processes","volume":"132 ","pages":"Pages 570-583"},"PeriodicalIF":6.1,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142657379","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Direct ink writing of 17–4PH stainless steel using green binder: Rheological sensitivity and performance assessment","authors":"Sean Wei Zen Fong ,&nbsp;Jing Yuen Tey ,&nbsp;Wei Hong Yeo ,&nbsp;Shiau Foon Tee","doi":"10.1016/j.jmapro.2024.10.077","DOIUrl":"10.1016/j.jmapro.2024.10.077","url":null,"abstract":"<div><div>Direct ink writing has emerged as a promising and cost-effective 3D stainless steel printing technique due to its capability in room temperature printing without a heat source. In this study, a novel solvent-based cellulose-derivative binder was incorporated to form a yield-pseudoplastic colloidal ink suspension up to 54.9 vol% (or 91.5 wt%) solid loading, improving shrinkage predictability. Rheological sensitivity analysis is used to construct a printability boundary for stainless steel printing with the cellulose-derivative binder. The method proposed in this paper offers attractiveness over conventional powder bed fusion, particularly in avoiding the challenges associated with loosely packed powder handling and environment safety. Moreover, it addresses environmental concerns by making use of non-toxic and eco-friendly binder. A comprehensive analysis of rheological study was conducted to identify parameters affecting printability and shape retention by varying the binder concentration and metal content. Through the sensitivity rheology analysis, the outcome yields exceptional printing quality and demonstrates its capability in producing complex parts. The sintered performance: achieving 93.6 % density at a sintering temperature of 1360 °C, minimal carbon content (0.033 wt%), with a hardness of 35.8 HRC and xyz-shrinkage of 10.81 %, 10.78 %, and 11.85 %, respectively which has high performance competitive value to technologies currently dominating the market like atomic diffusion additive manufacturing and bound metal deposition.</div></div>","PeriodicalId":16148,"journal":{"name":"Journal of Manufacturing Processes","volume":"132 ","pages":"Pages 519-531"},"PeriodicalIF":6.1,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142657383","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Investigation of MoSe2 filled MAO Coating on TC6 alloy- tribological and corrosion characterization of multiple interface structure","authors":"An Liu ,&nbsp;Song Gao ,&nbsp;Hailin Lu","doi":"10.1016/j.jmapro.2024.10.017","DOIUrl":"10.1016/j.jmapro.2024.10.017","url":null,"abstract":"<div><div>To enhance the tribological properties and corrosion resistance of titanium alloys, this study proposes a novel tribological interface structure combining micro-arc oxidation ceramic coatings with MoSe₂. Comprehensive analysis using X-ray diffractometry, profilometry, energy-dispersive spectroscopy, and scanning electron microscopy was conducted to evaluate the tribological characteristics of this structure under dry friction and liquid lubrication conditions. Electrochemical experiments assessed the corrosion resistance of the structure. The results indicated that under 3 N-2.5 cm/s, oil lubrication, the structure exhibited the best friction-reducing and lubricating performance, with the friction coefficient reduced by 75 %. The synergistic interaction between the low shear force MoSe₂ particles and the TiO₂-rich ceramic coating formed a lubricating layer on the surface, thereby achieving reduced friction and enhanced wear resistance. Additionally, this structure demonstrated excellent corrosion resistance. This study provides valuable insights for integrating micro-arc oxidation with new materials in engineering applications.</div></div>","PeriodicalId":16148,"journal":{"name":"Journal of Manufacturing Processes","volume":"132 ","pages":"Pages 506-518"},"PeriodicalIF":6.1,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142657384","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Microstructural evolution of polycrystalline α-Fe/Fe3C ultra-precision grinded under water lubrication","authors":"Changjiang Zhou ,&nbsp;Fa Zhang ,&nbsp;Haifeng Chen ,&nbsp;Ningwei Xia","doi":"10.1016/j.jmapro.2024.11.007","DOIUrl":"10.1016/j.jmapro.2024.11.007","url":null,"abstract":"<div><div>Ultra-precision grinding has gained substantial attention for its ability to significantly improve surface integrity. However, existing studies rarely investigate the effects of lubrication conditions at the microscopic level, which limits the understanding of microstructure evolution during ultra-precision grinding. In this work, a large-scale molecular dynamic (MD) method is proposed for simulating microstructural evolution of polycrystalline α-Fe/Fe₃C ultra-precision grinded under water lubrication. The water molecule and polycrystalline α-Fe/Fe₃C models are established using the measured and calculated interatomic potential functions. The effects of grinding parameters (infeed depth and lubrication status) on the ultra-precision grinding of internal stresses, temperature fields, workpiece topography and plastic deformation are investigated. Results show that the water film has a beneficial impact on workpiece quality, but has a negative effect on grinding efficiency. The plastic deformation mechanism of ultra-precision grinded polycrystalline α-Fe/Fe₃C primarily involves dislocation modulation, with the water film serving to reduce dislocations and promote cluster formation. This work offers valuable insights into the production of high-quality components.</div></div>","PeriodicalId":16148,"journal":{"name":"Journal of Manufacturing Processes","volume":"132 ","pages":"Pages 467-476"},"PeriodicalIF":6.1,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142657387","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}