Journal of Supercritical Fluids最新文献_第2页

The impact of processing conditions on PGSS micronisation of Fischer-Tropsch waxes 工艺条件对菲托蜡PGSS微粉化的影响

IF 4.4 3区工程技术

Journal of Supercritical Fluids Pub Date : 2025-09-19 DOI: 10.1016/j.supflu.2025.106785

Andri Swanepoel , Philip W. Labuschagne , Cara E. Schwarz

引用次数: 0

Solubility of ethenzamide and 2-chloro-4-nitrobenzoic acid in supercritical carbon dioxide from experiments and thermodynamic models 乙酰胺和2-氯-4-硝基苯甲酸在超临界二氧化碳中的溶解度的实验和热力学模型

IF 4.4 3区工程技术

Journal of Supercritical Fluids Pub Date : 2025-09-19 DOI: 10.1016/j.supflu.2025.106790

Yung-Chun Yang , Shih-Yu Chang , Yu-Ming Chen , Chie-Shaan Su , Chieh-Ming Hsieh

{"title":"Solubility of ethenzamide and 2-chloro-4-nitrobenzoic acid in supercritical carbon dioxide from experiments and thermodynamic models","authors":"Yung-Chun Yang , Shih-Yu Chang , Yu-Ming Chen , Chie-Shaan Su , Chieh-Ming Hsieh","doi":"10.1016/j.supflu.2025.106790","DOIUrl":"10.1016/j.supflu.2025.106790","url":null,"abstract":"<div><div>The solubility of solid solutes in supercritical carbon dioxide (scCO<sub>2</sub>) is critical for crystal engineering and pharmaceutical formulation. In this study, the solubility of ethenzamide and 2-chloro-4-nitrobenzoic acid in scCO<sub>2</sub> was measured for the first time using a high-pressure semi-flow apparatus at 308.2 K, 318.2 K, and 328.2 K over a pressure range of 10 MPa to 22 MPa. The solubility of ethenzamide ranged from 1.09 × 10<sup>−5</sup> to 3.24 × 10<sup>−4</sup>, and that of 2-chloro-4-nitrobenzoic acid from 3.88 × 10<sup>−6</sup> to 2.07 × 10<sup>−4</sup> (in mole fraction). Four semi-empirical models [Chrastil, Bartle, Mendez-Santiago & Teja (MST), and Kumar & Johnston (K-J)] were used to correlate the experimental data, yielding average absolute relative deviations (AARD) of 2.17–7.10 % for ethenzamide and 4.00–5.99 % for 2-chloro-4-nitrobenzoic acid, confirming the reliability of the measured solubility data. The validated data were further used to evaluate three thermodynamic approaches based on the Peng–Robinson equation of state (PR EOS). Among them, PR+VDW and PR+MHV1+Wilson achieved AARD values of 4.92 % and 8.97 % for ethenzamide, and 3.81 % and 8.64 % for 2-chloro-4-nitrobenzoic acid, respectively. The PR EOS couple with the COSMO-SAC model, implemented via the MHV1 mixing rule, provided good solubility predictions (AARD values of 33.98 % for ethenzamide and 6.30 % for 2-chloro-4-nitrobenzoic acid) without the need for parameter fitting.</div></div>","PeriodicalId":17078,"journal":{"name":"Journal of Supercritical Fluids","volume":"228 ","pages":"Article 106790"},"PeriodicalIF":4.4,"publicationDate":"2025-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145155150","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}

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Synergistic shrinkage control in supercritical CO2 foamed TPU systems via matrix strength modulation and nitrogen introduction 通过基质强度调节和氮气引入控制超临界CO2发泡TPU系统的协同收缩

IF 4.4 3区工程技术

Journal of Supercritical Fluids Pub Date : 2025-09-18 DOI: 10.1016/j.supflu.2025.106789

Huazhen Jiang, Panfeng Shao, Xia Liao

{"title":"Synergistic shrinkage control in supercritical CO2 foamed TPU systems via matrix strength modulation and nitrogen introduction","authors":"Huazhen Jiang, Panfeng Shao, Xia Liao","doi":"10.1016/j.supflu.2025.106789","DOIUrl":"10.1016/j.supflu.2025.106789","url":null,"abstract":"<div><div>Thermoplastic polyurethane (TPU) foam has been applied widely in footwear, medical treatment, automotive, packaging, transportation, aerospace, etc. due to excellent properties such as elasticity, high impact strength, low temperature resistance. However, the significant shrinkage of TPU foam prepared by supercritical carbon dioxide (CO<sub>2</sub>) imposes a limitation on its wider application. In this study, TPU with a low hardness which is favorable for high expansion ratio was used as the matrix and TPU foams prepared by two approaches was investigated: regulating hardness and crystallinity by incorporating high hardness TPU, as well as, foaming with mixture blowing agents or re-foaming with N<sub>2</sub>. The results showed that the shrinkage behavior of TPU foam could be inhibited by regulating its hardness and crystallinity behavior. Furthermore, the final expansion ratio was improved significantly by re-foaming with N<sub>2</sub> in comparison to foaming with mixture blowing agent. It was ascertained that TPU foams first foamed with CO<sub>2</sub> and re-foamed with N₂ not only is optimal for achieving a final expansion ratio of approximately 11 times but also achieving the best elasticity and high compressive strength.</div></div>","PeriodicalId":17078,"journal":{"name":"Journal of Supercritical Fluids","volume":"228 ","pages":"Article 106789"},"PeriodicalIF":4.4,"publicationDate":"2025-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145105666","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}

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Performance analysis of scCO2 closed Brayton cycle applied to aero engine thermal protection considering flow and heat transfer characteristics inside the scCO2-fuel heat exchanger 考虑scCO2-燃料换热器内部流动和传热特性的scCO2闭式Brayton循环在航空发动机热防护中的应用性能分析

IF 4.4 3区工程技术

Journal of Supercritical Fluids Pub Date : 2025-09-17 DOI: 10.1016/j.supflu.2025.106787

Xingjian Li , Yulong Li , Jingqi Li , Shijie Xu

{"title":"Performance analysis of scCO2 closed Brayton cycle applied to aero engine thermal protection considering flow and heat transfer characteristics inside the scCO2-fuel heat exchanger","authors":"Xingjian Li , Yulong Li , Jingqi Li , Shijie Xu","doi":"10.1016/j.supflu.2025.106787","DOIUrl":"10.1016/j.supflu.2025.106787","url":null,"abstract":"<div><div>To clarify the cycle performance considering flow and heat transfer characteristics inside the heat exchanger, this paper constructs a calculation model which combines heat exchanger model for an onboard scCO<sub>2</sub> closed Brayton cycle cooling system. Based on the model, the influence of fluid mass flow rate and flow heat transfer characteristics on cycle performance are clarified. The results indicate that the scCO<sub>2</sub> pressure losses inside the heat exchanger is the dominate factor on the cycle performance. The heat transfer deterioration inside heat exchanger caused by laminar flow area of fuel deteriorate the cycle performance. A critical fuel mass flow rate is found that the increase in fuel mass flow rate improves cycle thermodynamics performance below it and remains roughly constant above it. Furthermore, the increase in the heat exchanger’s flow area improves cycle thermal efficiency, however decreases the power-to-weight ratio of the heat exchanger, limiting its feasibility. Ultimately, recuperated layout can enhance system thermodynamic performance but deteriorate cooling performance.</div></div>","PeriodicalId":17078,"journal":{"name":"Journal of Supercritical Fluids","volume":"228 ","pages":"Article 106787"},"PeriodicalIF":4.4,"publicationDate":"2025-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145116279","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}

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Visualization experiment and numerical analysis of supercritical CO2 flow inside porous chip: Effect of heat transfer and porous structures 多孔切屑内超临界CO2流动的可视化实验与数值分析：传热与多孔结构的影响

IF 4.4 3区工程技术

Journal of Supercritical Fluids Pub Date : 2025-09-17 DOI: 10.1016/j.supflu.2025.106788

Jiaxin Liu , Mengshuai Chen , Rachid Bennacer , Lin Chen

{"title":"Visualization experiment and numerical analysis of supercritical CO2 flow inside porous chip: Effect of heat transfer and porous structures","authors":"Jiaxin Liu , Mengshuai Chen , Rachid Bennacer , Lin Chen","doi":"10.1016/j.supflu.2025.106788","DOIUrl":"10.1016/j.supflu.2025.106788","url":null,"abstract":"<div><div>Carbon dioxide (CO<sub>2</sub>) geological sequestration is one of the key methods to reduce atmospheric carbon emissions, yet the migration mechanisms of CO₂ within reservoirs remain unclear. This study systematically investigates the flow and heat transfer characteristics of supercritical CO₂ (sCO₂) in porous media through integrated optical visualization experiments and numerical simulations. Experimental results show that under supercritical conditions (pressure: 8.2–8.6 MPa, temperature: 32–34 °C), increasing the outlet pressure enhances momentum exchange but reduces flow uniformity, whereas raising the inlet temperature reduces fluid viscosity and smoothens density gradients, thereby improving flow homogeneity. Numerical simulations further reveal that under supercritical conditions (8.5 MPa, 305.15–318.15 K), boundary parameters including the inlet Reynolds number, inlet temperature, and wall heat flux exhibit non-monotonic influence patterns on the heat transfer coefficient (HTC), with an optimal range identified for each parameter. Exceeding this range leads to a significant reduction in HTC by 75–94 %. Under transcritical conditions (7.5–9.0 MPa, 303.15 K), the structure of the porous media effectively suppresses disturbances caused by thermophysical nonlinearities of sCO₂ through flow inertia, enabling the local heat transfer coefficient to maintain strong robustness against variations in outlet pressure and heat flux.</div></div>","PeriodicalId":17078,"journal":{"name":"Journal of Supercritical Fluids","volume":"228 ","pages":"Article 106788"},"PeriodicalIF":4.4,"publicationDate":"2025-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145105665","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}

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Efficient fabrication of thermoplastic polyester elastomer foams with high expansion ratio and superior dimensional stability 热塑性聚酯弹性体泡沫的高效制造，具有高膨胀率和优越的尺寸稳定性

IF 4.4 3区工程技术

Journal of Supercritical Fluids Pub Date : 2025-09-16 DOI: 10.1016/j.supflu.2025.106784

Yujiao Zhai , Jing Zhang , Jiale Chen , Fenghao Shi , Yucai Li , Xin Wu , Chunling Xin , Yadong He

{"title":"Efficient fabrication of thermoplastic polyester elastomer foams with high expansion ratio and superior dimensional stability","authors":"Yujiao Zhai , Jing Zhang , Jiale Chen , Fenghao Shi , Yucai Li , Xin Wu , Chunling Xin , Yadong He","doi":"10.1016/j.supflu.2025.106784","DOIUrl":"10.1016/j.supflu.2025.106784","url":null,"abstract":"<div><div>Due to its linear molecular chain structure, thermoplastic polyester elastomer (TPEE) exhibits inherently poor melt viscoelasticity and inadequate matrix strength. These limitations impair its foaming behavior and pose challenges in fabricating high-performance TPEE foams. Therefore, this work employed an epoxy chain extender (KL-E4370B) to modify TPEE. Results demonstrate that modified TPEE achieved a substantially enhanced branching degree, accompanied by a three orders of magnitude improvement in melt viscoelasticity. Notably, foaming temperature window broadened by 30 °C, while expansion ratio increased from 1.80 to 25.01. Moreover, modified TPEE exhibited a 29.96 % reduction in crystallinity, which enhanced gas permeability. This improvement effectively mitigated foam shrinkage while simultaneously accelerating recovery process. At 1.0 wt% KL-E4370B content, micro-crosslinked networks formed between molecular chains, enhancing matrix elastic modulus endowing TPEE foam with excellent self-recovery capability. Building on these results, this work successfully developed TPEE foams with simultaneous high expansion ratio and superior dimensional stability by regulating KL-E4370B content, establishing a novel strategy for engineering high-performance thermoplastic elastomer foams. Kohlrausch-Williams-Watts (KWW) model analysis further demonstrated that enhanced expansion ratio induced greater cell wall strain, which reduced the relaxation time of TPEE’s soft segments while narrowing their relaxation time distribution. This mechanistic explains the accelerated foam shrinkage behavior observed experimentally.</div></div>","PeriodicalId":17078,"journal":{"name":"Journal of Supercritical Fluids","volume":"228 ","pages":"Article 106784"},"PeriodicalIF":4.4,"publicationDate":"2025-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145118081","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}

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Comprehensive analysis and modeling of dye diffusion within fibers in supercritical CO2 for sustainable textile dyeing 超临界CO2环境下染料在纤维内扩散的综合分析与建模

IF 4.4 3区工程技术

Journal of Supercritical Fluids Pub Date : 2025-09-15 DOI: 10.1016/j.supflu.2025.106786

Shihan Wang, Tong Feng, Rongzhen Wang, Lin Li, Kunpeng Yu, Haixin Sun, Jianzhong Yin

{"title":"Comprehensive analysis and modeling of dye diffusion within fibers in supercritical CO2 for sustainable textile dyeing","authors":"Shihan Wang, Tong Feng, Rongzhen Wang, Lin Li, Kunpeng Yu, Haixin Sun, Jianzhong Yin","doi":"10.1016/j.supflu.2025.106786","DOIUrl":"10.1016/j.supflu.2025.106786","url":null,"abstract":"<div><div>The textile industry is widely recognized as a high-pollution sector, with conventional dyeing processes marked by excessive water usage, high pollutant discharge, and low efficiency. Supercritical CO<sub>2</sub> dyeing has garnered attention for its environmental benefits; however, its industrial application remains limited due to inefficiencies, primarily governed by the diffusion coefficient of dyes within the fiber matrix. This study compiles and analyzes existing literature to systematically examine how temperature, pressure, dye type, and fiber type influence the diffusion coefficient. Results indicate that higher temperatures significantly enhance diffusion, consistent with the Arrhenius equation. Pressure can promote diffusion through CO<sub>2</sub> plasticization of fibers, but its effect is complex and condition-dependent. Low-molar-mass dyes exhibit better diffusion, and fibers with lower crystallinity—such as PMIA—are more conducive to dye penetration. A multi-variable diffusion coefficient model was developed based on the Arrhenius equation and free volume theory. All model fitting errors were within 10 %, indicating strong descriptive accuracy within the studied parameter window. However, the model is currently limited to 14 data points covering four dyes, and within a temperature range of 353 K to 413 K and a pressure range of 15 MPa to 25 MPa. This model offers a theoretical foundation for optimizing supercritical CO<sub>2</sub> dyeing parameters and may be extended to a broader range of fiber-dye systems in future applications.</div></div>","PeriodicalId":17078,"journal":{"name":"Journal of Supercritical Fluids","volume":"228 ","pages":"Article 106786"},"PeriodicalIF":4.4,"publicationDate":"2025-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145105664","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}

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Synergistic effects of water and methanol mixed solvents on the liquefaction of Northeastern Indian coals: Insights from product analysis 水和甲醇混合溶剂对东北印度煤液化的协同效应：来自产品分析的见解

IF 4.4 3区工程技术

Journal of Supercritical Fluids Pub Date : 2025-09-12 DOI: 10.1016/j.supflu.2025.106783

Govind Dubey, Prabu Vairakannu, Pankaj Tiwari

引用次数: 0

Molecularly engineered alkyl-anthraquinone dyes for sustainable textile dyeing in supercritical carbon dioxide 分子工程烷基蒽醌染料在超临界二氧化碳环境下的可持续染色

IF 4.4 3区工程技术

Journal of Supercritical Fluids Pub Date : 2025-09-12 DOI: 10.1016/j.supflu.2025.106782

Jinglong Li , Meiyu Zhen , Yutao Feng , Ziyi Lu , Chang Wang , Xiaoqing Xiong

{"title":"Molecularly engineered alkyl-anthraquinone dyes for sustainable textile dyeing in supercritical carbon dioxide","authors":"Jinglong Li , Meiyu Zhen , Yutao Feng , Ziyi Lu , Chang Wang , Xiaoqing Xiong","doi":"10.1016/j.supflu.2025.106782","DOIUrl":"10.1016/j.supflu.2025.106782","url":null,"abstract":"<div><div>Alkyl-chain anthraquinone dyes have promising performance but face application constraints due to hydrophobicity and pollution in conventional water-based dyeing. This study developed an eco-friendly synthesis and dyeing approach. Six dyes (AQ-5 to AQ-7, CAQ-5 to CAQ-7) were synthesized in supercritical carbon dioxide (scCO₂) via reactions of 1-chloroanthraquinone/1,5-dichloroanthraquinone with <em>n</em>-alkylamines. They showed good light absorption and thermal stability (5 % weight loss at 245–298°C, suitable for scCO₂ dyeing). Meanwhile, scCO₂ dyeing regularity was revealed through the synergistic regulation of multiple parameters. Optimal scCO₂ dyeing conditions for polyester were determined: 16 MPa, 130°C, 90 min for AQ-5–AQ-7; the optimal dyeing conditions for CAQ-5–CAQ-7 were determined and these were included in the range of 120–135 °C, 16 MPa, 70–100 min. Dyed fabrics had uniform fixation with excellent washing, dry, and wet rubbing over than grade 4, and good light fastness. This work establishes a green scCO₂ system, overcoming traditional limitations, and provides a theoretical basis for eco-friendly dyes/technologies.</div></div>","PeriodicalId":17078,"journal":{"name":"Journal of Supercritical Fluids","volume":"228 ","pages":"Article 106782"},"PeriodicalIF":4.4,"publicationDate":"2025-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145105667","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}

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Shelf-life of sterilised alginate-gelatine aerogels developed through an integrated high-pressure and supercritical CO2 process 通过高压和超临界CO2综合工艺开发的灭菌海藻酸盐-明胶气凝胶的保质期

IF 4.4 3区工程技术

Journal of Supercritical Fluids Pub Date : 2025-09-10 DOI: 10.1016/j.supflu.2025.106781

Cristiana S.A. Bento , Dhara Leite Lopes , Cristiane Flora Villarreal , Nuno Empadinhas , Susana Alarico , Hermínio C. de Sousa , Mara E.M. Braga

{"title":"Shelf-life of sterilised alginate-gelatine aerogels developed through an integrated high-pressure and supercritical CO2 process","authors":"Cristiana S.A. Bento , Dhara Leite Lopes , Cristiane Flora Villarreal , Nuno Empadinhas , Susana Alarico , Hermínio C. de Sousa , Mara E.M. Braga","doi":"10.1016/j.supflu.2025.106781","DOIUrl":"10.1016/j.supflu.2025.106781","url":null,"abstract":"<div><div>Shelf-life studies on sterile biopolymeric aerogels are scarce. This study investigated four storage conditions (C<sub>1</sub> - C<sub>4</sub>), varying temperature, humidity, and light exposure, on alginate-gelatine aerogels produced via an integrated high-pressure and supercritical CO<sub>2</sub> process. Mild storage conditions (C<sub>1</sub> - 25 ºC, 60 % humidity and no light) effectively preserved aerogels’ structural and functional properties, with minimal changes over time. In contrast, accelerated storage conditions (C<sub>2</sub> - 40 ºC, 75 % humidity, no light) induced hydrolytic degradation, causing chain scission and structural damage, due to heat and moisture. Light exposure at mild storage conditions (C<sub>3</sub>) induced mild photooxidative effects without significant impact on properties. The combination of all stressors at accelerated storage (C<sub>4</sub>) severely compromised network, thermal and mechanical stability. Swelling profile increased under storage but it was mitigated under conditions with high temperature and humidity. Storage for 6 months did not promote microbial growth on the sterilised aerogels under the tested conditions, confirming the effectiveness of the CO<sub>2</sub> sterilisation process. Aerogels did not present cytotoxicity, regardless of the storage conditions, however wound-healing potential declined under storage conditions C<sub>2</sub>, C<sub>3</sub> and C<sub>4</sub>, while C<sub>1</sub> maintained performance for three months.</div></div>","PeriodicalId":17078,"journal":{"name":"Journal of Supercritical Fluids","volume":"228 ","pages":"Article 106781"},"PeriodicalIF":4.4,"publicationDate":"2025-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145057326","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