Applied Thermal Engineering最新文献

{"title":"Comparative optimization of the thermal performance for H2 – Metal hydride heat storage and heat pump systems","authors":"Ke Wang ,&nbsp;Tiange Chu ,&nbsp;Shuiyun Shen ,&nbsp;Lu Li","doi":"10.1016/j.applthermaleng.2024.124991","DOIUrl":"10.1016/j.applthermaleng.2024.124991","url":null,"abstract":"<div><div>Metal hydride is very promising in hydrogen storage and simultaneously the thermal effect in the reversible hydrogenation process makes it possible in heat storage and heat pump area. The interaction of H₂ – Metal – hydride pair and its further applications need comprehensive thermodynamic design and performance optimization. Therefore, this work makes thermodynamic comparative research of heat storage and heat pump systems by adopting H₂ – Metal-hydride pair. According to the investigation, the thermodynamically optimal charging-discharging temperatures (<span><math><msub><mi>T</mi><mrow><mi>m</mi><mn>1</mn></mrow></msub><mo>,</mo><msub><mi>T</mi><mrow><mi>m</mi><mn>2</mn></mrow></msub></math></span>), the heat source temperature (<span><math><msub><mi>T</mi><mrow><mi>h</mi><mn>1</mn></mrow></msub></math></span>) and the ambient temperature (<span><math><msub><mi>T</mi><mrow><mi>c</mi><mn>1</mn></mrow></msub></math></span>) meet the relationship of <span><math><msub><mi>T</mi><mrow><mi>m</mi><mn>1</mn></mrow></msub><msub><mi>T</mi><mrow><mi>m</mi><mn>2</mn></mrow></msub><mo>=</mo><msub><mi>T</mi><mrow><mi>h</mi><mn>1</mn></mrow></msub><msub><mi>T</mi><mrow><mi>c</mi><mn>1</mn></mrow></msub></math></span> for the heat storage system. Given the operating pressure (<em>p</em>), there exists a well-matched temperature (<em>T</em>) range to maximize the exergy performance of metal hydride heat storage system. Meanwhile, the running <em>p-T</em> is positively correlated, e.g., when the charging pressure is set at 0.2 MPa to 0.3 MPa, the well-matched <em>T</em> varies from 307 K to 317 K. When the discharging pressure is set at 0.4 MPa to 0.7 MPa, the well-matched <em>T</em> varies from 304 K to 320 K. For the metal hydride heat pump system, the optimal performance lies in maximizing the transported heat. Given the operating <em>T</em>, there exists a well-matched pressure range for the heat sink device, e.g., for the heat releasing process, when operating <em>T</em> is set at 353 K, 363 K, 373 K, 383 K and 393 K, the well-matched <em>p</em> are 2.3 MPa, 3.3 MPa, 3.8 MPa, 4.6 MPa and 6.1 MPa. Both the heat storage and heat pump performances are also affected by the operating pressure – temperature −transported heat, presenting improved region and degraded region. The optimal thermodynamic criterion and the matchability of the operating parameters provide a theoretical guidance for the MH-based thermodynamic system design and operation.</div></div>","PeriodicalId":8201,"journal":{"name":"Applied Thermal Engineering","volume":"260 ","pages":"Article 124991"},"PeriodicalIF":6.1,"publicationDate":"2024-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142743844","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}

{"title":"Dynamic blade tip clearance control of aero-engine by the integration of cooling air with fuel thermal management system","authors":"Weilong Gou ,&nbsp;Shiyu Yang ,&nbsp;Yuanfang Lin ,&nbsp;Faning Shao ,&nbsp;Xingang Liang ,&nbsp;Bo Shi","doi":"10.1016/j.applthermaleng.2024.125042","DOIUrl":"10.1016/j.applthermaleng.2024.125042","url":null,"abstract":"<div><div>In advanced aero-engines, the precise control of tip clearance and thermal management of the fuel system are two important measures to improve the transient performance of the aero-engine. In order to optimize the overall performance of an aero-engine during a full-flight mission, this paper proposed a novel architecture integrating active clearance control system and aero-engine fuel thermal management system, which utilizes fuel heat sink to achieve indirect regulation of the tip clearance. Furthermore, a set of critical optimization criteria for the new architecture was derived to achieve dynamic heat distribution in the fuel thermal management system. Subsequently, the transient performance was tested under a complete flight mission with a duration of 10,000 s. The calculation results indicate that the new architecture effectively raises the fuel temperature to its maximum allowable value during low thermal load phases, which increases heat dissipation capability of the system. The new architecture exhibits a significant effect on the control of the tip clearance during the ground idle, cruise, and engagement phases, resulting in a maximum increase of 1.86% in the relative efficiency of the high-pressure turbine. The new architecture also prevents the engine from experiencing excessively narrow tip clearance during acceleration. Ultimately, the new architecture achieves a 2.59% reduction in total fuel consumption compared to the original design. The new architecture has significant potential to improve engine efficiency and increase operational safety.</div></div>","PeriodicalId":8201,"journal":{"name":"Applied Thermal Engineering","volume":"261 ","pages":"Article 125042"},"PeriodicalIF":6.1,"publicationDate":"2024-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142758996","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}

{"title":"Design and optimization of the jet cooling structure for permanent magnet synchronous motor","authors":"Jianjun Hu,&nbsp;Zutang Yao,&nbsp;Yuntong Xin,&nbsp;Zhicheng Sun","doi":"10.1016/j.applthermaleng.2024.125051","DOIUrl":"10.1016/j.applthermaleng.2024.125051","url":null,"abstract":"<div><div>Permanent magnet synchronous motor (PMSM) is widely used in electric vehicles due to its high power density and wide speed range. However, when operating under long-term heavy load conditions, PMSM is prone to heat accumulation. It’s difficult to cool the motor with existing indirect cooling structures efficiently, which may lead to its high temperature and result in winding burnout or even permanent demagnetization of the magnets. In this paper, a novel cooling structure based on jet cooling is proposed to reduce the operating temperature of the PMSM efficiently and improve its stability. The temperature field model, which accounts for the influence of end windings, is developed to analyze and optimize the parameters of the jet cooling structure, leading to the determination of an optimal parameter set. By exploring the cooling effects of motors with different cooling structures under stable, extreme and mixed cycle operating conditions, it is proved that the jet cooling structure designed in this paper can effectively reduce the temperature of the motor and ensure its reliable operation. The results show that with the influence of the jet cooling structure designed in this paper, the maximum temperatures of the rotor and winding are reduced by 35.2℃ and 44.5℃ respectively.</div></div>","PeriodicalId":8201,"journal":{"name":"Applied Thermal Engineering","volume":"260 ","pages":"Article 125051"},"PeriodicalIF":6.1,"publicationDate":"2024-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142721774","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}

{"title":"Multi-objective optimization of nanofluid thermal performance in battery cold plates using computational fluid dynamics","authors":"Fan Ren ,&nbsp;Qibin Li ,&nbsp;Penglai Wang ,&nbsp;Liyong Xin","doi":"10.1016/j.applthermaleng.2024.125034","DOIUrl":"10.1016/j.applthermaleng.2024.125034","url":null,"abstract":"<div><div>Inspired by the tree root structure, this paper uses commercial CFD software to simulate and analyze the cold plate of three-dimensional battery, and focuses on the heat transfer problem of tree root sine pipe to improve the heat dissipation performance of LiFePO₄ battery. Utilizing nanofluids as working fluids, the research explores the impact of channel geometry, discharge power, nanofluid type, volume fraction, initial temperature, and velocity on heat transfer characteristics. The results show that the heat transfer effect of sinusoidal pipeline is obviously improved compared with traditional pipeline. Among the tested nanofluids, a 5 % Cu-water mixture exhibited the highest heat transfer efficiency. Furthermore, higher initial nanofluid velocity and lower initial temperature led to reduced average cold plate temperatures. Response surface methodology and genetic algorithm were utilized to optimize the thermophysical properties and initial operating conditions of the nanofluid. The influencing factors, including initial temperature (288 K–298 K), initial velocity (0.05 m/s–0.25 m/s), and volume fraction (1 %–5 %), were analyzed with the objective of establishing a relationship between the average battery temperature and pressure drop. And the optimized solution identified an ideal combination of inlet velocity, temperature, and nanofluid volume fraction of 0.14 m/s, 288.00 K, and 4.41 %, respectively, maximizing heat dissipation while minimizing pressure loss.</div></div>","PeriodicalId":8201,"journal":{"name":"Applied Thermal Engineering","volume":"260 ","pages":"Article 125034"},"PeriodicalIF":6.1,"publicationDate":"2024-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142743843","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}

{"title":"Real-time 3D temperature field reconstruction for aluminum alloy forging die using Swin Transformer integrated deep learning framework","authors":"Zeqi Hu ,&nbsp;Yitong Wang ,&nbsp;Hongwei Qi ,&nbsp;Yongshuo She ,&nbsp;Zunpeng Lin ,&nbsp;Zhili Hu ,&nbsp;Lin Hua ,&nbsp;Min Wu ,&nbsp;Xunpeng Qin","doi":"10.1016/j.applthermaleng.2024.125033","DOIUrl":"10.1016/j.applthermaleng.2024.125033","url":null,"abstract":"<div><div>Temperature field distribution in forging dies is crucial for quality control and defect prevention, particularly for aluminum alloys. Current methods are limited to discrete points or surface measurements, making real-time three-dimensional temperature field acquisition challenging. In this paper, a novel Swin Transformer-integrated deep learning framework is proposed for real-time 3D temperature field reconstruction of forging dies, pioneering the application of transformer architecture in physical field prediction. In this framework, numerical simulations are first conducted to provide ground truth and fundamental insights into the temperature evolution, and then limited sparse thermal sensors are utilized to offer corrected real-time input parameters. The model for 3D temperature field reconstruction is developed through the combination of Swin Transformers with the U-shaped encoder-decoder structure, which is trained and tested with various sensor configurations, initialization methods, and datasets, including actual experiments. The results demonstrate that the proposed Swin-UNETR model achieves 3D temperature field prediction with time cost of 0.98 s per frame, mean absolute error of 0.8658 °C, showing a 17.23 % improvement over the next best CNN-based model (ResUNet3D at 1.0461 °C), and a 4.63 % improvement over the next best machine learning model (LightGBM at 0.9078 °C), which can be attributed to the Swin Transformer’s ability to capture both local and global contextual information and shifted window mechanism. The proposed method holds significant implications for ensuring the forming quality of forgings and propelling the development of digital twin technology in forging processes.</div></div>","PeriodicalId":8201,"journal":{"name":"Applied Thermal Engineering","volume":"260 ","pages":"Article 125033"},"PeriodicalIF":6.1,"publicationDate":"2024-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142721773","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}

{"title":"Energy efficiency and economic analysis of a novel polygeneration system based on LNG cold energy utilization and wet flue gas waste heat recovery","authors":"Zhen Shangguan ,&nbsp;Ziliang Rui ,&nbsp;Shulin Zhang ,&nbsp;Juan He ,&nbsp;Lei Chen ,&nbsp;Zhicheng Wang ,&nbsp;Hao Peng","doi":"10.1016/j.applthermaleng.2024.125055","DOIUrl":"10.1016/j.applthermaleng.2024.125055","url":null,"abstract":"<div><div>The polygeneration systems based on liquefied natural gas (LNG) cold energy recovery are limited by high investment costs, low efficiency due to low-grade heat sources, and low LNG cold energy utilization efficiency. In this paper, a novel polygeneration system based on LNG cold energy utilization and wet flue gas waste heat recovery was proposed. This system was designed to utilize low-grade wet flue gas as a heat source, and to effect waste heat recovery and low-temperature carbon dioxide (CO₂) capture from the flue gas. A thermodynamic and economic model was developed to analyze the performance of system. Parameter analysis and exergy analysis were conducted to examine the impact of thermodynamic parameters on system performance. Furthermore, the initial investment cost and daily average income of the system were evaluated. To optimize the performance of system, a genetic algorithm was employed. The results demonstrate that the cooling output and total power output of the proposed system are 17.60 kW and 448.00 kW, respectively, and a carbon capture rate of 92.86 % with an exergy efficiency of 38.95 % is achieved. The estimated investment payback period is 1.32 years. Based on the optimization results, the exergy efficiency of the system reaches 45.26 % and the total power output of the optimized system is 505.08 kW. These findings provide important theoretical groundwork and technical support for the widespread application of LNG in cryogenic power generation and carbon capture.</div></div>","PeriodicalId":8201,"journal":{"name":"Applied Thermal Engineering","volume":"260 ","pages":"Article 125055"},"PeriodicalIF":6.1,"publicationDate":"2024-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142697559","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}

{"title":"Heat transfer characteristics of buried pipes under groundwater seepage in Karst regions","authors":"Ruiyong Mao ,&nbsp;Yaya Chen ,&nbsp;Zujing Zhang ,&nbsp;Jing Chen ,&nbsp;Jiri Zhou ,&nbsp;Hong Ma","doi":"10.1016/j.applthermaleng.2024.125046","DOIUrl":"10.1016/j.applthermaleng.2024.125046","url":null,"abstract":"<div><div>Utilising geothermal energy through ground-source heat pump (GSHP) systems is a viable option. Karst regions, renowned for their abundant geothermal resources and complex geological structures, present a unique challenge owing to the presence and fluctuations of groundwater, which significantly alter the operational environment of GSHPs. Therefore, it is crucial to explore the mechanisms and performance of GSHPs in such areas. Based on actual Karst geological structures and using similarity theory, a multi-layer experimental model of a ground heat exchanger (GHE) was established in a laboratory. To enhance the GSHP performance, a forced seepage plan for shallow soil layers was proposed. Then, a controlled variable method was employed to investigate the impact of aquifer-related groundwater seepage factors on the heat transfer performance of buried pipes. Thresholds for groundwater velocity and temperature that enhanced thermal performance were identified. Groundwater seepage shortens the recovery time of the temperature field in geotechnical materials and influences the heat exchange intensity based on the flow temperature. This study focuses on a layered heat transfer model and proposes a relationship between aquifer thickness and geotechnical heat transfer, providing theoretical support for the application and optimisation of GSHP systems in Karst regions.</div></div>","PeriodicalId":8201,"journal":{"name":"Applied Thermal Engineering","volume":"260 ","pages":"Article 125046"},"PeriodicalIF":6.1,"publicationDate":"2024-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142743745","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}

{"title":"Thermal response time characteristics of endothermic hydrocarbon fuel in cooling channels with thermal cracking","authors":"Kun Wu ,&nbsp;Junbo He ,&nbsp;Yu Feng ,&nbsp;Jiang Qin ,&nbsp;Hongyan Huang","doi":"10.1016/j.applthermaleng.2024.125054","DOIUrl":"10.1016/j.applthermaleng.2024.125054","url":null,"abstract":"<div><div>The varying operating conditions of hypersonic vehicles often lead to variations in the demand for cooling capability and the heat transfer performance of hydrocarbon fuel in regenerative cooling channels. Understanding the transient heat transfer performance of hydrocarbon fuel is essential for optimizing cooling systems; existing research on thermal response time distribution, particularly in the context of thermal cracking, is notably limited. This study combines experimental and numerical approaches to investigate the transient flow and heat transfer behavior of hydrocarbon fuel undergoing thermal cracking, fills a gap in the current literature and offers new insights into the management of cooling systems. According to the experimental data, the thermal response time decreased as temperature increase, which is different from that of noncracking region. A series of numerical simulation results revealed that the enhancement of heat transfer at the interface and the acceleration of thermal diffusion within the fluid due to thermal cracking makes the heat transfer faster, eventually lead to the shorter thermal response time. Thus, the thermal response time distribution across the entire temperature range is characterized by a pattern of initial decrease, followed by an increase, and then a subsequent decrease as the temperature rises. In addition, the nonlinear relation between the chemical reaction and temperature caused the thermal response and chemical reaction response to be unsynchronized, leading to differences in the transient response processes induced by increased and decreased heat fluxes. Based on the experimental data, a new empirical correlation with an error within 20% effective across entire temperature range is proposed, offering a valuable tool for engineers and researchers working with hydrocarbon fuels in hypersonic applications.</div></div>","PeriodicalId":8201,"journal":{"name":"Applied Thermal Engineering","volume":"260 ","pages":"Article 125054"},"PeriodicalIF":6.1,"publicationDate":"2024-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142743776","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}

{"title":"An Open-Source algorithm for automatic geometrical optimization of extruded liquid cold plates for enhanced thermal management in railway electronics","authors":"Raffaele De Rosa ,&nbsp;Marco Bernagozzi ,&nbsp;Anastasios Georgoulas ,&nbsp;Luca Romagnuolo ,&nbsp;Emma Frosina ,&nbsp;Adolfo Senatore","doi":"10.1016/j.applthermaleng.2024.124873","DOIUrl":"10.1016/j.applthermaleng.2024.124873","url":null,"abstract":"<div><div>This paper presents the development and application of an optimization algorithm for determining the geometric parameters of an extruded Liquid Cold Plate (LCP) with internally finned channels. The entire workflow operates within a fully open-source environment, offering a comprehensive and accessible solution for optimizing LCP geometric parameters for efficient thermal management in railway power electronics as well as other industrial applications. In particular, the aim is to minimize the maximum temperature and the temperature gradient at the interface between the LCP and an electronic device for electric trains that dissipates heat. The algorithm explores a defined range of geometric parameters and automatically generates combinations and performs Computational Fluid Dynamics (CFD) simulations, using the open-source C++ toolbox OpenFOAM. Implemented in a bash script, the algorithm not only automates the simulation process but also provides a geometry of the LCP that is easy to manufacture and cost-effective. The correct value of parameters, such as the distance between the fins bottom surface and the channel base (gap), along with others, has shown a significant impact, leading to a reduction in both the maximum interface temperature (8<!--> <!-->K) and the temperature gradient (25<!--> <!-->K/m) within the system.</div></div>","PeriodicalId":8201,"journal":{"name":"Applied Thermal Engineering","volume":"260 ","pages":"Article 124873"},"PeriodicalIF":6.1,"publicationDate":"2024-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142743842","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}

{"title":"Experimental and numerical studies on enhanced flow boiling in tube with superwetting micro-finned surfaces","authors":"K. Cao ,&nbsp;X.K. Song ,&nbsp;F. Qin,&nbsp;X.G. Wei,&nbsp;W.Q. Li","doi":"10.1016/j.applthermaleng.2024.125032","DOIUrl":"10.1016/j.applthermaleng.2024.125032","url":null,"abstract":"<div><div>Due to the high latent heat from evaporation, flow boiling has been applied in a variety of industrial applications. However, the occurrence of “annular bubble” will dramatically increase the thermal resistance near the wall, causing decreases both in heat transfer coefficient (HTC) and critical heat flux (CHF). To tackle this issue, we propose the micro-finned surfaces with strong capillary force to enhance the heat transfer coefficient and critical heat flux for flow boiling. With deionized water as the coolant, we investigate the effects of fin width, fin height, fin pitch, coolant flow rate and heat flux on flow boiling through experiment and numerical simulation. The results show that the wider the fin width, the lower the fin height, and the smaller the fin pitch, the higher the convective heat transfer coefficient. In addition, the higher the coolant flow rate leads to higher heat transfer coefficient and lower flow boiling instability. When the heat flux increases, the convective heat transfer coefficient and flow instability increase. Among them, the microchannel with fin width of 20 μm, fin height 40 μm, and fin pitch 40 μm obtains the maximum convective heat transfer coefficient, 59.3 % higher than that of the smooth microchannel.</div></div>","PeriodicalId":8201,"journal":{"name":"Applied Thermal Engineering","volume":"260 ","pages":"Article 125032"},"PeriodicalIF":6.1,"publicationDate":"2024-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142697439","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}