Cryogenics最新文献

{"title":"Development of high-capacity GM cryocoolers and circulating cooling systems for HTS applications","authors":"Santhosh Kumar Gandla ,&nbsp;Stephen Dunn ,&nbsp;Ralph C. Longsworth ,&nbsp;Mingyao Xu ,&nbsp;Eric Seitz","doi":"10.1016/j.cryogenics.2025.104046","DOIUrl":"10.1016/j.cryogenics.2025.104046","url":null,"abstract":"<div><div>Sumitomo (SHI) cryogenics has been a pioneer and industry leader in developing cryocoolers for all major cryogenic applications including healthcare, semiconductor manufacturing, laboratory research, and quantum computing, for customers globally. With the rising demand for high temperature superconducting (HTS) applications like high field magnets, fusion and power devices, (superconducting magnetic energy storage (SMES), and fault current limiters (FCLs)), we have increased our efforts in the last decade to develop and offer cryogenic cooling solutions like single stage Gifford-McMahon (GM) cryocoolers and cryogenic circulating cooling systems to address the needs of our global customers.</div><div>In this paper, we will discuss the design challenges, integration concerns, test findings and application examples for the high-capacity GM cryocoolers and cryogenic circulating systems developed by Sumitomo (SHI) Cryogenics of America Inc. We will also delve into comparing legacy systems to potential new systems identifying benefits and limitations.</div></div>","PeriodicalId":10812,"journal":{"name":"Cryogenics","volume":"147 ","pages":"Article 104046"},"PeriodicalIF":1.8,"publicationDate":"2025-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143509537","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}

{"title":"Mechanical and electromagnetic properties of CORC cables under combined loads of axial tension and transverse compression","authors":"Jiangtao Yan ,&nbsp;Yuanwen Gao","doi":"10.1016/j.cryogenics.2025.104045","DOIUrl":"10.1016/j.cryogenics.2025.104045","url":null,"abstract":"<div><div>Conductors on round core (CORC) superconducting cables have a special construction that provides them with excellent mechanical performance and symmetrical electromagnetic properties, making them a promising option for high magnetic field magnets and accelerator magnets. In these applications, the combination of high engineering current density and high magnetic fields results in large electromagnetic forces or thermal loads acting on the CORC cable, which may lead to irreversible degradation of its properties. These loads typically appear in two perpendicular directions: axial tension by hoop stresses and transverse compression by radial stresses. Therefore, enhancing the irreversible strain limit in axial tensile and transverse compression deformation is imperative while minimizing magnetization losses during the design of CORC cables. This paper develops a finite element (FE) model that can be used to predict the mechanical and electromagnetic behaviors of CORC cables when subjected to axial tensile and transverse compressive loads. The irreversible strain limit for various combined axial tensile-transverse compression deformation modes is investigated from the critical current density reduction perspective. The distribution of axial strain in the ReBCO layer is analyzed. On this basis, a discussion of the effect of strain on electromagnetic properties is presented. In general, it can be observed that the irreversible strain limit of CORC cables exhibits greater sensitivity to axial tensile strain as compared to transverse compressive strain. Smaller winding angles are still the optimal choice regarding resistance to deformation and critical current degradation. The conclusions drawn in this paper will guide the design of future CORC cables.</div></div>","PeriodicalId":10812,"journal":{"name":"Cryogenics","volume":"147 ","pages":"Article 104045"},"PeriodicalIF":1.8,"publicationDate":"2025-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143453451","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}

{"title":"Experimental study on thermal performance of a long-distance helium two-phase closed thermosyphon","authors":"Rongjian Li ,&nbsp;Xiaoyu Cui ,&nbsp;Zhenhua Jiang ,&nbsp;Chen Liu ,&nbsp;Zhe Yan","doi":"10.1016/j.cryogenics.2025.104044","DOIUrl":"10.1016/j.cryogenics.2025.104044","url":null,"abstract":"<div><div>Long-distance helium two-phase closed thermosyphons (TPCT) have significant potential for cooling superconducting magnets due to their simple structure and low thermal resistance. In this work, a helium TPCT is designed and fabricated with a vertical heat transfer distance of 860 mm. Experiments on helium TPCT are conducted with variations in heat power (0 – 1.3 W) and filling ratios (9.1% – 72.8%). Results demonstrate that the filling of helium can accelerate the cooling rate of thermosyphon. The heat transfer limit of the helium TPCT initially increases and then decreases as the filling ratio is increased. Two different heat transfer limit modes can be recognized: the dry-out limit, which emerges in the low to medium filling ratio (9.1% – 41.1%), and the boiling limit, which emerges in the high filling ratio (50.4% – 72.8%). The temperature and pressure characteristics exhibit significant differences<!--> <!-->between these two heat transfer limit modes. As the heat power increases, the total thermal resistance of the helium TPCT shows a downward trend. However, once the heat power exceeds the heat transfer limit, the thermal resistance increases sharply. The designed helium TPCT exhibits optimal thermal performance at a filling ratio of 50.4%, with a heat transfer limit of 1.15 W, a thermal resistance is approximately 0.18 K∙W⁻¹, and an effective thermal conductivity is approximately 23,800 W∙m⁻¹∙K⁻¹, demonstrating the superiority of TPCT for cooling superconducting magnets. The heat transport mechanisms revealed in the present study are expected to contribute to the design of high-efficiency helium heat pipes and facilitate their engineering applications.</div></div>","PeriodicalId":10812,"journal":{"name":"Cryogenics","volume":"147 ","pages":"Article 104044"},"PeriodicalIF":1.8,"publicationDate":"2025-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143465413","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}

{"title":"Cryogenic helium flow in adiabatic capillary tubes: Numerical insights into choked flow and superfluid behavior in Joule-Thomson cryocoolers","authors":"Xin Zhang ,&nbsp;Longyu Yang ,&nbsp;Yixin Wang ,&nbsp;Xueshuo Shang ,&nbsp;Wendi Bao ,&nbsp;Ziyi Li ,&nbsp;Cheng Shao ,&nbsp;Zheng Cui","doi":"10.1016/j.cryogenics.2025.104043","DOIUrl":"10.1016/j.cryogenics.2025.104043","url":null,"abstract":"<div><div>The Joule-Thomson (J-T) effect, utilizing helium as the working fluid, is widely employed for refrigeration in the 1–4 K temperature range. The capillary tube, acting as a throttling element, plays a crucial role in providing flow resistance and regulating flow rates. However, critical information regarding helium flow in the capillary tube—such as the onset of choked flow, the existence of superfluid transition, and the dependence of flow rates and the cooling power on the geometric factors of the capillary tube and operating conditions—remains inadequately understood. This paper presents a numerical analysis investigating the flow dynamics and refrigeration characteristics of helium through adiabatic straight capillary tubes. The findings establish criteria for identifying the onset of choked flow and superfluid transition. Results indicate that helium flow within the capillary tube typically operates in the choked flow regime in practical applications. Should a superfluid transition occur, it takes place in the free expansion region outside the capillary tube, exerting minimal influence on the internal flow dynamics. Furthermore, sensitivity analysis identifies the inner diameter as a crucial parameter dictating the mass flow rate. Design guidelines are also provided for the optimal selection of capillary tubes in cryogenic applications.</div></div>","PeriodicalId":10812,"journal":{"name":"Cryogenics","volume":"147 ","pages":"Article 104043"},"PeriodicalIF":1.8,"publicationDate":"2025-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143453452","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}

{"title":"High temperature superconducting magnet system with a high pressure chamber at a cryogenic temperatures for neutron scattering investigations","authors":"Aleksandr Chernikov ,&nbsp;Ion Dobrin ,&nbsp;George Dumitru ,&nbsp;Sergey Kulikov ,&nbsp;Otilia Ana Culicov ,&nbsp;Dan Enache","doi":"10.1016/j.cryogenics.2025.104035","DOIUrl":"10.1016/j.cryogenics.2025.104035","url":null,"abstract":"<div><div>For the DN-12 neutron diffractometer at the IBR-2 reactor of the Frank Laboratory of Neutron Physics, JINR, a cryomagnetic system with horizontal arrangement based on a high temperature superconducting magnet generating a magnetic field of 4.6 T at a current of 290 A was designed, developed and tested. The unique cryomagnetic system is designed to study phases of condensed matter systems with neutron as a function of P,T,H. The configuration of the Helmholtz coil of a high-temperature superconducting magnet made it possible not only to achieve high uniformity of the magnetic field on the sample &gt; 99.68 % in the central zone of the magnet ± 20 mm around its center, but also to provide 360° access to the central region of the magnetic field in a perpendicular plane on the sample with the exception of four sectors of 12 degrees each due to the spacer design pillars. The magnetic axis is passing through its center. This configuration allows to simultaneously detect the neutron scattered on the sample using two neutron detectors positioned at angles of 45° and 90° to the axis of the neutron beam, respectively.</div><div>The HTS coils are double pancakes cooled via heat conduction using a Gifford-McMahon (G-M) cryocooler. The dimensions of the magnet, inner diameter 80 mm, outer diameter 200 mm, distance between the coils 40 mm, allow the installation of an inner cryostat with high pressure chamber that is cooled using the second G-M closed-cycle cryocooler and can create a pressure on the sample 10 GPa. The temperature of the magnet windings can vary in the range of 16–40 K depending on the temperature of the high pressure chamber with the sample that is regulated in the range of 3.6–150 K. The developed cryomagnetic system has reached all design parameters and is ready for testing on a neutron beam.</div></div>","PeriodicalId":10812,"journal":{"name":"Cryogenics","volume":"147 ","pages":"Article 104035"},"PeriodicalIF":1.8,"publicationDate":"2025-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143420917","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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":"Magnetic properties of Ni-Cu-Zn ferrite nanoparticles at cryogenic temperature probed under Mössbauer and VSM studies","authors":"K.S. Ramakrishna ,&nbsp;Ch. Srinivas ,&nbsp;E. Ranjith Kumar ,&nbsp;T. Pushpagiri ,&nbsp;Sher Singh Meena ,&nbsp;Pramod Bhatt ,&nbsp;D.L. Sastry","doi":"10.1016/j.cryogenics.2025.104040","DOIUrl":"10.1016/j.cryogenics.2025.104040","url":null,"abstract":"<div><div>This article presents a comprehensive analysis of magnetic properties of Ni<em>_x</em>Cu_0.1Zn_0.9−<em>_x</em>Fe₂O₄ (<em>x</em> = 0.5, 0.6, 0.7). Typical variation of bond angles supported the <em>A</em>-<em>B</em> superexchange interaction. The unsaturated magnetization even at higher applied field shows the core–shell interactions of present ferrite nanoparticles. Neel’s sublattice and core–shell models have been adopted to analyze the magnetic behaviour. The saturation magnetization is unevenly varying in both sintered ferrite samples. It was found to be in the range of 15.29–28.04 emu/g. The highest of saturation magnetization (28.04 emu/g) was reported for the ferrite composition Ni_0.7Cu_0.1Zn_0.4Fe₂O₄ sintered at 500 °C. The coercivity seems to be dependent on magnetic anisotropy. The cusp between the field cooled and zero field cooled curves revealed the large distribution of ferrite nanoparticles in different sizes. The blocking temperature increases in both sintered ferrite samples with the substitution of Ni²⁺. The blocking temperature depends on the variation of crystallite size. The appearance of quadruple and hyperfine spectral lines in Mössbauer spectra represent the distribution of ferrite nanoparticles in different sizes. The range of isomer shift (0.194 – 0.463 mm/s) is less than 0.5 mm/s that represents the presence of only high spin Fe³⁺ ions.</div></div>","PeriodicalId":10812,"journal":{"name":"Cryogenics","volume":"147 ","pages":"Article 104040"},"PeriodicalIF":1.8,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143445850","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}

{"title":"Experimental and simulation study of LN2 active-pressurization in onboard LH2 storage and supply systems","authors":"Hao Qiu,&nbsp;Bifeng Yin,&nbsp;Fei Dong,&nbsp;Xuan Xie,&nbsp;Sheng Xu","doi":"10.1016/j.cryogenics.2025.104042","DOIUrl":"10.1016/j.cryogenics.2025.104042","url":null,"abstract":"<div><div>To prevent insufficient pressure within the onboard LH₂ storage tank during supply, which could lead to significant residual LH₂ that cannot be supplied, the design of the onboard LH₂ storage and supply system needs to consider the active-pressurization method of the LH₂ tank. To investigate whether the active-pressurization method can meet the active-pressurization performance requirements for low-temperature fluids in onboard LH₂ storage tanks, this study uses LN₂ as the working fluid. Experiments on active-pressurization and supply in the onboard LH₂ storage system were conducted, exploring the impact of different LN₂ fill levels on the active-pressurization rate and the pressure stability during the active-pressurization supply process. Based on the parameters of the LH₂ tank, a system simulation model was established. The maximum active-pressurization flow rate of the simulation model was calibrated according to the active-pressurization experimental data, further exploring the active-pressurization storage and supply characteristics of the onboard LH₂ tank. The results indicate that the active-pressurization supply simulation results, calibrated with the active-pressurization flow rate, show good consistency with the experimental data. As the supply flow rate increases, the active-pressurization maintaining pressure slightly decreases. When the liquid level drops too low and transitions to gaseous supply, the pressure inside the tank rapidly declines. At an ambient temperature of −10 °C, the active-pressurization can still offset the pressure drop caused by the supply. However, higher ambient temperatures increase the temperature difference during, leading to a higher evaporation rate inside the tank. The active-pressurization flow rate was corrected by the ratio of the densities and viscosities of LN₂ and LH₂ to investigate the situation of active-pressurization to exceed the critical pressure. When the LH₂ tank is actively pressurized to the critical pressure, there is still a return gas temperature difference close to 170 K, which is much higher than the 0 K of LN₂, thereby promoting the active-pressurization rate. This study explored the active-pressurization capability and influencing factors of onboard LH₂ storage tanks through LN₂ experiments and system simulation methods, providing a foundation for precise control of the active-pressurization supply in onboard LH₂ systems.</div></div>","PeriodicalId":10812,"journal":{"name":"Cryogenics","volume":"147 ","pages":"Article 104042"},"PeriodicalIF":1.8,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143429964","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}

{"title":"Experimental study on catalytic conversion and flow characteristics of ortho-para hydrogen in tubular packed-bed converters at liquid nitrogen temperature","authors":"Kai Wang ,&nbsp;Sheng Xu ,&nbsp;Jinming Zheng ,&nbsp;Shaolong Zhu ,&nbsp;Song Fang ,&nbsp;Hongmei Xiao ,&nbsp;Na Li ,&nbsp;Limin Qiu","doi":"10.1016/j.cryogenics.2025.104041","DOIUrl":"10.1016/j.cryogenics.2025.104041","url":null,"abstract":"<div><div>Ortho-para hydrogen conversion is a critical process in hydrogen liquefaction. However, comprehensive data and correlations on the ortho-para hydrogen conversion and pressure drop within catalyst packed beds across the typical range of Reynolds numbers encountered in converters/heat exchangers are still lacking. This study established an experimental setup to measure the catalytic conversion of ortho-para hydrogen and the associated pressure drop in tubular packed-bed converters in the liquid nitrogen temperature range. The effects of the particle size of iron oxide catalysts (20–80 mesh), space velocity (1.5–22 kg/(m³·s)), and packed-bed porosity (0.27–0.46) on the catalytic conversion of ortho-para hydrogen, along with the pressure drop characteristics, were examined at around 77 K and 2 MPa. A correlation was further developed for estimating the outlet concentration of para hydrogen with given space velocity, which would be useful for determining the catalyst dosage based on the targeted conversation rate in the product. Furthermore, by modifying the coefficients for viscous and inertial resistance on the basis of the Ergun equation, pressure drop correlations for packed-bed catalytic converters with different particle sizes were proposed, with remarkably improved predictive accuracy. This work offers critical prediction correlations for the design of ortho-para hydrogen catalytic converters/heat exchangers.</div></div>","PeriodicalId":10812,"journal":{"name":"Cryogenics","volume":"147 ","pages":"Article 104041"},"PeriodicalIF":1.8,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143420838","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}

{"title":"Measurement of the thermal expansion of bulk metallic glass in cryogenic temperature with a laser displacement method","authors":"Takashi Hirayama,&nbsp;Sojiro Uemura,&nbsp;Takaaki Morie","doi":"10.1016/j.cryogenics.2025.104037","DOIUrl":"10.1016/j.cryogenics.2025.104037","url":null,"abstract":"<div><div>The thermal expansion of structural components is a very important factor when designing cryogenic equipment such as cryocooler or superconducting equipment. However, conventional thermal expansion measurement systems require calibration of the sensor of the measurement system at cryogenic temperature, making measurement difficult. Therefore, in this study, we developed a new thermal expansion measurement system that can measure thermal expansion more conveniently than conventional measurement systems. Thermal expansion was measured using laser displacement units installed outside the vacuum vessel. Moreover, a conduction cooling system using a 4K-GM cryocooler was adopted for cooling. To confirm the effectiveness of the developed system, the thermal expansion of copper, a well-known material, was measured using this system, and the results were consistent with that of a previous study. The thermal expansion of bulk metallic glass, which is expected to be used in cryogenic environments, was measured using the developed system, and it was found to be -0.23% at cryogenic temperatures, smaller than that of other typical materials such as copper and aluminum.</div></div>","PeriodicalId":10812,"journal":{"name":"Cryogenics","volume":"147 ","pages":"Article 104037"},"PeriodicalIF":1.8,"publicationDate":"2025-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143395324","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}

{"title":"Thermal conductivity and contraction of single and fifty-stacked 2G HTS tapes for the design of a superconducting fusion magnet","authors":"Tomoyuki Naito ,&nbsp;Tetsuhiro Obana ,&nbsp;Makoto Takayasu","doi":"10.1016/j.cryogenics.2025.104038","DOIUrl":"10.1016/j.cryogenics.2025.104038","url":null,"abstract":"<div><div>We measured the thermal conductivity, <span><math><mi>κ</mi><mo>(</mo><mi>T</mi><mo>)</mo></math></span>, of the single GdBa₂Cu₃O<span><math><msub><mrow></mrow><mrow><mn>7</mn><mo>−</mo><mi>δ</mi></mrow></msub></math></span> coated conductor (GdBCO-CC) tape and a bundled sample prepared by soldering fifty GdBCO-CC tapes, to design the thermal stability of a next high-temperature superconducting fusion magnet. A low-temperature peak for <span><math><mi>κ</mi><mo>(</mo><mi>T</mi><mo>)</mo></math></span> was observed for the single GdBCO-CC tape at 28.6 K. A simple heat-flow model for the layered sample demonstrated that the applied heat flowed mainly through the high purity metal such as the Cu and Ag-stabilizing layers. The <span><math><mi>κ</mi><mo>(</mo><mi>T</mi><mo>)</mo></math></span> of the bundled sample was similar to that of the single tape, suggesting that the contribution of the soldering layers to the heat flow was negligible and the <span><math><mi>κ</mi><mo>(</mo><mi>T</mi><mo>)</mo></math></span> of fifty or more bundled samples can be estimated using the <span><math><mi>κ</mi><mo>(</mo><mi>T</mi><mo>)</mo></math></span> of the single tape. We also measured the thermal contraction of the single tape along the length and of the fifty-stacked tape along the stacking direction, and then found that the stacking structure caused the large shrinkage along the stacking direction, which should be useful to optimize the structure of magnet at the operating low-temperature.</div></div>","PeriodicalId":10812,"journal":{"name":"Cryogenics","volume":"147 ","pages":"Article 104038"},"PeriodicalIF":1.8,"publicationDate":"2025-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143429965","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}