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Preparation, surface characterization and dielectric studies of hydrogen irradiated Cu/PANI polymer composites 氢辐照Cu/PANI聚合物复合材料的制备、表面表征及介电性能研究
IF 0.9 4区 材料科学
Digest Journal of Nanomaterials and Biostructures Pub Date : 2023-04-01 DOI: 10.15251/djnb.2023.182.475
A. Atta, B. M. Alotaibi, H. Al-Yousef, A. M. Abdel-Reheem
{"title":"Preparation, surface characterization and dielectric studies of hydrogen irradiated Cu/PANI polymer composites","authors":"A. Atta, B. M. Alotaibi, H. Al-Yousef, A. M. Abdel-Reheem","doi":"10.15251/djnb.2023.182.475","DOIUrl":"https://doi.org/10.15251/djnb.2023.182.475","url":null,"abstract":"In this study, a PANI/Cu nanocomposite films are prepare using ion sputtering technique. Then PANI/Cu nanocomposite films are irradiated by different fluence of low energy hydrogen ion (1x1016, 4x1016, and 8x1016 ion/cm2 ). The changes in crystallite structure are studied using XRD diffractometer. The dielectric properties and the energy density of the blank and irradiated films are obtained at room temperature in the frequency range of 100 to 5MHz. The measurements indicated significant changes in these parameters after hydrogen ion irradiation. The dielectric constant 𝜀𝜀′ improved from 1.5 for PANI/Cu to 6, 10 and 23 after exposed to 1x1016, 4x1016, and 8x1016 ion/cm2 . Moreover, the conductivity energy density is improved from 1.6x10-5 for unirradiated to 2.1x10-5 , 4.8x10-5 , and 1.5x10-4 for irradiated films. The results confirmed an improving in electric properties and energy density of the irradiated PANI/Cu nanocomposite films, which can using these films in wide range of application such as super-capacitor and microelectronic devices.","PeriodicalId":11233,"journal":{"name":"Digest Journal of Nanomaterials and Biostructures","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43616451","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Facile fabrication of 3D graphene hydrogel (rGH) for enhanced removal of heavy metal Cr (VI) 促进3D石墨烯水凝胶（rGH）的制备，用于增强重金属Cr（VI）的去除
IF 0.9 4区 材料科学
Digest Journal of Nanomaterials and Biostructures Pub Date : 2023-04-01 DOI: 10.15251/djnb.2023.182.463
Y. Li, X. Y. Zhao, X. Guo, J. Wang, W. Chen
{"title":"Facile fabrication of 3D graphene hydrogel (rGH) for enhanced removal of heavy metal Cr (VI)","authors":"Y. Li, X. Y. Zhao, X. Guo, J. Wang, W. Chen","doi":"10.15251/djnb.2023.182.463","DOIUrl":"https://doi.org/10.15251/djnb.2023.182.463","url":null,"abstract":"The reduced graphene hydrogel (rGH) was prepared by chemical reduction method, and removal performance of heavy metal Cr (VI) in static water was studied. The rGH has a three-dimensional structure and narrow pore size distribution, that the adsorption process of Cr (VI) by rGH is in accordance with Langmuir isotherm model, and the maximum adsorption capacity is 139.6 mg·g-1 .The significant adsorption capacity is mainly attributed to the fact that rGH has nano-sheet structure, and maintains the surface adsorption characteristics of graphene with rapid adsorption. The π-π action will reduce the competitive adsorption of water and increase the adsorption capacity.","PeriodicalId":11233,"journal":{"name":"Digest Journal of Nanomaterials and Biostructures","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47124717","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Synthesis, optical and AC electrical characteristics of nanocomposites (Bi2O3/ZnO) films prepared by thermal evaporation technique 热蒸发法制备纳米复合材料(Bi2O3/ZnO)薄膜的合成、光学和交流电特性
IF 0.9 4区 材料科学
Digest Journal of Nanomaterials and Biostructures Pub Date : 2023-04-01 DOI: 10.15251/djnb.2023.182.437
H. S. Suhail, A. R. Abdulridha
{"title":"Synthesis, optical and AC electrical characteristics of nanocomposites (Bi2O3/ZnO) films prepared by thermal evaporation technique","authors":"H. S. Suhail, A. R. Abdulridha","doi":"10.15251/djnb.2023.182.437","DOIUrl":"https://doi.org/10.15251/djnb.2023.182.437","url":null,"abstract":"In this paper, pure bismuth oxide (Bi2O3) and ZnO-doped with a ratio of (0, 0.12, 0.24, 0.36 and 0.48 wt.%) thin films are prepared by thermal evaporation methods under pressure 1×10-7 bar with a rate of deposition 0.5 nm.s-1 , at ambient temperature on glass substrates (RT) with thickness 50 nm and annealed at temperature 573 K for 2 hours. The phase structures of Bi2O3 (monoclinic) and Bi2O3/ZnO NCPs are confirmed by X-ray diffraction (XRD) investigation. The concentration of ZnO-doping reduces the average crystallite size from 17,35 nm to 8.67 nm. Moreover, using XRD data, the average strain, stress, and dislocation density values are computed. The spectroscopy techniques such as Fourier transform infrared (FT-IR) and scanning electron microscopy with field emission probes were used to examine the structures. The FT-IR results showed no chemical interactions between the (Bi2O3/ZnO) NPs. The results of the field emission-scanning electron microscope (FE-SEM) analysis the (Bi2O3/ZnO) NPs were distributed uniformly throughout. The actually result of optical characteristics for (Bi2O3/ZnO) showed that the absorbance, and absorption coefficient, increase with the increased concentrations of (ZnO). At the same time, the transmittance and energy band gaps were decreased with a rise in concentrations (ZnO) that have a high ability to absorb UV-light. The dielectric characteristics were checked in the frequency range from 100 Hz to 5 MHz. The results of the insulating characteristics showed that the dielectric constant and the dielectric loss of thin films (Bi2O3/ZnO) decreased with increasing frequency. In contrast, they increase when the concentration of (ZnO NPs) increases. The A.C conductivity of the thin films (Bi2O3/ZnO) increases with the frequency and concentration of (ZnO) NPs. Finally, the structural and insulating results the indicated characteristics of the (Bi2O3/ZnO) thin films may be helpful in various nano-electronic devices and sensors.","PeriodicalId":11233,"journal":{"name":"Digest Journal of Nanomaterials and Biostructures","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48306757","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Application of pani/metal oxide composite as an active material of liquified petroleum gas sensors 聚苯胺/金属氧化物复合材料作为液化石油气传感器活性材料的应用
IF 0.9 4区 材料科学
Digest Journal of Nanomaterials and Biostructures Pub Date : 2023-04-01 DOI: 10.15251/djnb.2023.182.485
N. P. Putri, Sujatmiko Wibowo, L. N. Maulida, E. Suaebah, L. Rohmawati, F. Ermawati, Z. Supardi
{"title":"Application of pani/metal oxide composite as an active material of liquified petroleum gas sensors","authors":"N. P. Putri, Sujatmiko Wibowo, L. N. Maulida, E. Suaebah, L. Rohmawati, F. Ermawati, Z. Supardi","doi":"10.15251/djnb.2023.182.485","DOIUrl":"https://doi.org/10.15251/djnb.2023.182.485","url":null,"abstract":"Polyaniline (PANI) and metal oxides are two materials that have various applications, including active sensors. PANI provides several benefits over other conductive polymers, including ease of synthesis, affordability, and high conductivity. Depending on the benefits of PANI, here we report the fabrication of PANI/metal oxide composites as an active material for gas sensors, especially LPG. By oxidatively polymerizing aniline at room temperature, PANI was formed. PANI/metal oxide composites were produced by using an in-situ polymerization technique. The PANI/MgO and PANI/ZnO nanocomposites were successfully fabricated, as shown by FTIR and XRD characterization results. The sensitivity of PANI/metal oxide nanocomposites to LPG has been proven. The result shows that PANI/metal oxide sensitivity is better than barePANI/MgO, which is one of the kinds of metal oxide used. Several concentrations of gas were used at low ppm: 50, 100, and 200 ppm to identify the sensitivity of PANI. The size of the pores with a radius of 285 Ă of the PANI/MgO nanocomposite shows that the value sensitivity was improved. The PANI/MgO nanocomposite has the best sensitivity to LPG exposure because it works well at all concentrations.","PeriodicalId":11233,"journal":{"name":"Digest Journal of Nanomaterials and Biostructures","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49320261","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Rapid synthesis of trimetallic alloy PtPdNi nanosponges: structural, morphology and catalytic performance 三金属合金PtPdNi纳米海绵的快速合成:结构、形态及催化性能
IF 0.9 4区 材料科学
Digest Journal of Nanomaterials and Biostructures Pub Date : 2023-04-01 DOI: 10.15251/djnb.2023.182.451
M. A. Abdul Razak, M. Johan Ooi, Y. Yusof, P. R. Jubu
{"title":"Rapid synthesis of trimetallic alloy PtPdNi nanosponges: structural, morphology and catalytic performance","authors":"M. A. Abdul Razak, M. Johan Ooi, Y. Yusof, P. R. Jubu","doi":"10.15251/djnb.2023.182.451","DOIUrl":"https://doi.org/10.15251/djnb.2023.182.451","url":null,"abstract":"Pt alloy nanostructures have been explored as promising anode catalysts for methanol oxidation reaction. However, the Pt catalyst have continued to face challenges that are yet to be resolved. Studies have shown that the size and geometric structure can influence a material’s catalytic activity and is related to the synthesis technique. In this study, PtPdNi nanostructures were produced at different synthesis duration. FESEM results show that all the samples exhibited nanosponges structure. The PtPdNi synthesized for 150 s, exhibited higher catalytically active toward methanol oxidation and resistance to carbon monoxide poisoning.","PeriodicalId":11233,"journal":{"name":"Digest Journal of Nanomaterials and Biostructures","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43791571","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Deposition of WC on TiO2 nanosheets with exposed (001) facets for photocatalytic degradation 在具有暴露（001）面的TiO2纳米片上沉积WC用于光催化降解
IF 0.9 4区 材料科学
Digest Journal of Nanomaterials and Biostructures Pub Date : 2023-04-01 DOI: 10.15251/djnb.2023.182.523
Y. Dong, Y. C. Zhang, B. Ren, S. N. Liu, Y. Li, Y. Sun
{"title":"Deposition of WC on TiO2 nanosheets with exposed (001) facets for photocatalytic degradation","authors":"Y. Dong, Y. C. Zhang, B. Ren, S. N. Liu, Y. Li, Y. Sun","doi":"10.15251/djnb.2023.182.523","DOIUrl":"https://doi.org/10.15251/djnb.2023.182.523","url":null,"abstract":"Anatase TiO2 nanosheets with exposed (001) facets were prepared by a hydrothermal method under HF condition. Then, commercial WC particles were deposited on TiO2 nanosheets by physical mixing method. The prepared samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), UV-vis diffuse reflectance spectroscopy (DRS), X-ray photoelectron spectroscopy and nitrogen adsorption-desorption isotherms. To investigate the effect of WC loading on the photocatalytic performance, the degradation of Rhodamine B (RhB) dye was conducted under simulated light. The results indicated that the WC/TiO2 exhibited higher photocatalytic activity than pure TiO2 catalyst. When the WC loading was 10 wt%, the degradation efficiency reached 90.2% within 60 min. The enhanced photocatalytic performance may be attributed to the introduction of WC particles which could react as an electron trap and promote the separation of photogenerated electron-hole pairs of TiO2. Meanwhile, the trapping experiment confirmed that superoxide radical (·O2 - ) and hole (h+) played leading roles in the degradation of RhB.","PeriodicalId":11233,"journal":{"name":"Digest Journal of Nanomaterials and Biostructures","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42408802","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Hydrogen production from hydrolysis of NaBH4-NH3BH3 composite catalyzed by porous spherical Co3O4 多孔球形Co3O4催化NaBH4-NH3BH3复合物水解制氢
IF 0.9 4区 材料科学
Digest Journal of Nanomaterials and Biostructures Pub Date : 2023-04-01 DOI: 10.15251/djnb.2023.182.495
Mijia Yang, Y. C. Wu, Y. H. Liu, Z. H. Li, M. Cheng, C. Wu, W. Feng, W. Cai, X. L. Wang
{"title":"Hydrogen production from hydrolysis of NaBH4-NH3BH3 composite catalyzed by porous spherical Co3O4","authors":"Mijia Yang, Y. C. Wu, Y. H. Liu, Z. H. Li, M. Cheng, C. Wu, W. Feng, W. Cai, X. L. Wang","doi":"10.15251/djnb.2023.182.495","DOIUrl":"https://doi.org/10.15251/djnb.2023.182.495","url":null,"abstract":"NaBH4-NH3BH3 composite (xSB-AB, x is the molar ratio of SB to AB) has better hydrolysis performance than its monomer, but the hydrogen generation rate (HGR) and hydrogen yield (HY) are still not ideal at room temperature. In this work, a low cost and easily available commercial porous spherical Co3O4 was successfully used to catalyze the hydrolysis of xSB-AB composite. It was found that Co3O4 showed good catalytic performance for the hydrolysis of xSB-AB, and the HY and hydrogen release efficiency (HRE) of 4SB-AB/10 wt%Co3O4 at 40 ℃ reached 2,279.71 mL·g-1 and 89.13%, respectively.","PeriodicalId":11233,"journal":{"name":"Digest Journal of Nanomaterials and Biostructures","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44574792","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Simulation design and optimization of amorphous silicon/crystalline silicon heterojunction solar cells based on localized p-n junctions 基于局域p-n结的非晶硅/晶体硅异质结太阳能电池的仿真设计与优化
IF 0.9 4区 材料科学
Digest Journal of Nanomaterials and Biostructures Pub Date : 2023-04-01 DOI: 10.15251/djnb.2023.182.423
J. S. Wang, Junsong Yuan, S. Q. Liu, X. Deng
{"title":"Simulation design and optimization of amorphous silicon/crystalline silicon heterojunction solar cells based on localized p-n junctions","authors":"J. S. Wang, Junsong Yuan, S. Q. Liu, X. Deng","doi":"10.15251/djnb.2023.182.423","DOIUrl":"https://doi.org/10.15251/djnb.2023.182.423","url":null,"abstract":"Hydrogenated amorphous silicon/crystalline silicon heterojunction solar cells are currently a hot research topic in the field of photovoltaics, where parasitic absorption due to hydrogenated amorphous silicon layers has not been effectively addressed. For this reason, amorphous silicon/crystalline silicon heterojunction solar cells with localized p-n junctions (HACL cells) have been designed, which can significantly improve the parasitic absorption losses while maintaining the original advantages such as high open-circuit voltage. In this paper, we mainly use ATLAS 2D simulation software to conduct device simulation and parameter optimization of HACL cells, and simulate the effects of factors such as passivation inlet region width, insulation layer width, emitter width, passivation inlet region doping concentration and substrate doping concentration on the cell performance, respectively.","PeriodicalId":11233,"journal":{"name":"Digest Journal of Nanomaterials and Biostructures","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42882650","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Effect of TiO2 nanoparticles filler on structural, optical, thermal, and mechanical properties of TiO2/LDPE nanocomposites films TiO2纳米粒子填料对TiO2/LDPE纳米复合薄膜结构、光学、热学和力学性能的影响
IF 0.9 4区 材料科学
Digest Journal of Nanomaterials and Biostructures Pub Date : 2023-03-01 DOI: 10.15251/djnb.2023.181.273
V. Thongpool, A. Phunpueok, S. Jaiyen, T. Sornkwan, W. Jakarbutr, P. Minyong
{"title":"Effect of TiO2 nanoparticles filler on structural, optical, thermal, and mechanical properties of TiO2/LDPE nanocomposites films","authors":"V. Thongpool, A. Phunpueok, S. Jaiyen, T. Sornkwan, W. Jakarbutr, P. Minyong","doi":"10.15251/djnb.2023.181.273","DOIUrl":"https://doi.org/10.15251/djnb.2023.181.273","url":null,"abstract":"This study blended low-density polyethylene (LDPE) polymer matrix with titanium dioxide (TiO2) nanoparticles as UV blocking filler to create a greenhouse cover film. The best properties for greenhouse application were discovered in TiO2/LDPE nanocomposites films with 5% wt TiO2 nanoparticles, according to the results. TiO2/LDPE nanocomposites films prepared in all conditions can block almost 100% of the UV (200- 400 nm) radiation and show good thermal stability. The TiO2/LDPE nanocomposites films with 5% wt TiO2 nanoparticles has a light transmittance in the visible range of about 80%, sufficient for plant photosynthesis. In addition, it showed good mechanical properties with 12.142 MPa of tensile strength and 319.274% of elongation at break.","PeriodicalId":11233,"journal":{"name":"Digest Journal of Nanomaterials and Biostructures","volume":"13 2","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41302160","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Preparation and luminescence properties of Mg2Sr2-XTiO4: Eu3+, Gd3+ red phosphors Mg2Sr2-XTiO4: Eu3+， Gd3+红色荧光粉的制备及发光性能
IF 0.9 4区 材料科学
Digest Journal of Nanomaterials and Biostructures Pub Date : 2023-03-01 DOI: 10.15251/djnb.2023.181.253
You-Dong Li, Hengjian Huang, Limin Dong, Dan Li, Wenhua Shi, J. Yin
{"title":"Preparation and luminescence properties of Mg2Sr2-XTiO4: Eu3+, Gd3+ red phosphors","authors":"You-Dong Li, Hengjian Huang, Limin Dong, Dan Li, Wenhua Shi, J. Yin","doi":"10.15251/djnb.2023.181.253","DOIUrl":"https://doi.org/10.15251/djnb.2023.181.253","url":null,"abstract":"Titanate-based luminescent materials have a strong absorption capacity for blue and near-ultraviolet light. Here, a sol-gel method is used to prepare a high-efficiency red phosphor of magnesium titanate Mg2Sr2-xTiO4: Eu3+, Gd3+ doped with rare-earth ions. The optimal doping concentrations of the activator rare earth ion Eu3+ and the sensitizer Gd3+ were investigated. Furthermore, the doping of a certain amount of Sr2+ and Na+ effectively improves the luminescence properties of silicate luminescent materials. The luminescence spectrum shows that the luminescent material has red monochromaticity and the strongest red-light emission is 614nm, which can be used for WLED.","PeriodicalId":11233,"journal":{"name":"Digest Journal of Nanomaterials and Biostructures","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43378899","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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