There are many applications involving the use of bismuth antimony thin films. However, due to the low crystalline symmetry and strong coupling between the electronic band edges, it has always been challenging to infer the electronic phase of such a material. Fortunately, with the development of pattern recognition technology, scientists can build many black-box tools for predicting various materials properties. In this present work, we have developed several pattern recognition tools to predict the electronic phase of a bismuth antimony thin film. The support vector machine, the decision tree, and the artificial neural network are used to achieve a prediction accuracy of ~90%, ~95% and ~100%, respectively.
{"title":"Pattern Recognition for the Electronic Phase of Bismuth Antimony Thin Films","authors":"Shuangxi Tang, Lucy Dow, Emmanuel C. Ojukwu","doi":"10.30919/esmm5f661","DOIUrl":"https://doi.org/10.30919/esmm5f661","url":null,"abstract":"There are many applications involving the use of bismuth antimony thin films. However, due to the low crystalline symmetry and strong coupling between the electronic band edges, it has always been challenging to infer the electronic phase of such a material. Fortunately, with the development of pattern recognition technology, scientists can build many black-box tools for predicting various materials properties. In this present work, we have developed several pattern recognition tools to predict the electronic phase of a bismuth antimony thin film. The support vector machine, the decision tree, and the artificial neural network are used to achieve a prediction accuracy of ~90%, ~95% and ~100%, respectively.","PeriodicalId":11851,"journal":{"name":"ES Materials & Manufacturing","volume":"97 25 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79587554","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Photovoltaic-thermoelectric (PV-TE) hybrid system is an appealing idea due to its potential to harvest thermal energy produced in photovoltaic conversion process or mitigate the temperature effect through cooling. The rationale for developing PV-TE hybrid system is illustrated in Fig. 1, which depicts three possible strategies that might lead to a higher overall efficiency of the hybrid system than that of photovoltaic system alone. In strategy (a), thermoelectric device is used as a cooler that is in direct contact with the solar cells. Since the solar cells exhibit negative temperature coefficient, reducing the operating temperature of the solar cells could lead to an increase in the power output of the solar cell. In strategy (b), thermoelectric device is arranged in similar manner as strategy (a) but used as a thermoelectric generator. Thermalisation loss inside solar cells will lead to an increase in the temperature of the solar cells, which in turn establishes a temperature difference across the thermoelectric generator. As a result, the waste thermal energy from the solar cell can be utilised by thermoelectric generator to convert into useful electric power. In strategy (c), the solar energy in infrared spectrum, which has no use to solar cells, is separated from the visible spectrum and directed to a thermoelectric generator for power generation. Clearly, these strategies are built on the sound scientific rationales. The key question is if they will lead to a realistic improvement when other influences are taken into consideration. This paper aims to offer critical assessments on the prospect in these research directions.
{"title":"Prospective Photovoltaic-Thermoelectric Hybrid System","authors":"G. Min","doi":"10.30919/esmm5e606","DOIUrl":"https://doi.org/10.30919/esmm5e606","url":null,"abstract":"Photovoltaic-thermoelectric (PV-TE) hybrid system is an appealing idea due to its potential to harvest thermal energy produced in photovoltaic conversion process or mitigate the temperature effect through cooling. The rationale for developing PV-TE hybrid system is illustrated in Fig. 1, which depicts three possible strategies that might lead to a higher overall efficiency of the hybrid system than that of photovoltaic system alone. In strategy (a), thermoelectric device is used as a cooler that is in direct contact with the solar cells. Since the solar cells exhibit negative temperature coefficient, reducing the operating temperature of the solar cells could lead to an increase in the power output of the solar cell. In strategy (b), thermoelectric device is arranged in similar manner as strategy (a) but used as a thermoelectric generator. Thermalisation loss inside solar cells will lead to an increase in the temperature of the solar cells, which in turn establishes a temperature difference across the thermoelectric generator. As a result, the waste thermal energy from the solar cell can be utilised by thermoelectric generator to convert into useful electric power. In strategy (c), the solar energy in infrared spectrum, which has no use to solar cells, is separated from the visible spectrum and directed to a thermoelectric generator for power generation. Clearly, these strategies are built on the sound scientific rationales. The key question is if they will lead to a realistic improvement when other influences are taken into consideration. This paper aims to offer critical assessments on the prospect in these research directions.","PeriodicalId":11851,"journal":{"name":"ES Materials & Manufacturing","volume":"31 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86976690","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Frequency conversions, such as second harmonic generation (SHG), third harmonic generation (THG), high harmonic generation (HHG), and wave mixing, are typical processes in nonlinear optics, which have a wide range of applications in new light sources, bioimaging and sensing, quantum optics, and holography. To engineer and manipulate these nonlinear optical processes, metasurfaces and nanophotonic structures have been introduced, which have been successfully demonstrated as powerful tools to tailor the key features of light and excite the extraordinary phenomena in linear optics. In this review, we highlight the recent progress on frequency conversion in plasmonic metasurfaces, all-dielectric metasurfaces as well as other nanophotonic structures, ranging from SHG, THG to HHG and wave mixing. The origin of optical nonlinearity and its coupling with subwavelength resonators are discussed, which fundamentally determine the conversion efficiency and functionality. Finally, we summarize the challenges that nonlinear metasurfaces and nanophotonics now face and offer an outlook on further development and application potential.
{"title":"Recent Progress on Optical Frequency Conversion in Nonlinear Metasurfaces and Nanophotonics","authors":"Chen Wang, Y. Wen, Jingbo Sun, Ji Zhou","doi":"10.30919/esmm5f655","DOIUrl":"https://doi.org/10.30919/esmm5f655","url":null,"abstract":"Frequency conversions, such as second harmonic generation (SHG), third harmonic generation (THG), high harmonic generation (HHG), and wave mixing, are typical processes in nonlinear optics, which have a wide range of applications in new light sources, bioimaging and sensing, quantum optics, and holography. To engineer and manipulate these nonlinear optical processes, metasurfaces and nanophotonic structures have been introduced, which have been successfully demonstrated as powerful tools to tailor the key features of light and excite the extraordinary phenomena in linear optics. In this review, we highlight the recent progress on frequency conversion in plasmonic metasurfaces, all-dielectric metasurfaces as well as other nanophotonic structures, ranging from SHG, THG to HHG and wave mixing. The origin of optical nonlinearity and its coupling with subwavelength resonators are discussed, which fundamentally determine the conversion efficiency and functionality. Finally, we summarize the challenges that nonlinear metasurfaces and nanophotonics now face and offer an outlook on further development and application potential.","PeriodicalId":11851,"journal":{"name":"ES Materials & Manufacturing","volume":"11 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79899667","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Yingying Chen, Qing-gang Li, Zhi Wang, G. Shi, J. Wu, Mengyong Sun
{"title":"The Post-treatments of Aluminum Oxynitride(AlON) Powders Synthesized by the Carbothermal Reduction and Nitriding Process","authors":"Yingying Chen, Qing-gang Li, Zhi Wang, G. Shi, J. Wu, Mengyong Sun","doi":"10.30919/esmm5f542","DOIUrl":"https://doi.org/10.30919/esmm5f542","url":null,"abstract":"","PeriodicalId":11851,"journal":{"name":"ES Materials & Manufacturing","volume":"46 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77809749","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
He Han, Haoyang Sun, Fan Lei, Jintao Huang, S. Lyu, Bangyao Wu, Meng Yang, Chentao Zhang, An Li, Zhi Zhang, D. Sun
With electronic equipment becoming more integrated, multifunctional, and lightweight, the demand for advanced thermal management materials with excellent electrical insulation and high thermal conductivity is increasing. In this study, the fluorographene (FG) nanosheets with different degrees of fluorination were successfully exfoliated from the corresponding raw graphite fluoride by using a facile low-energy ball milling process and ultrasonic treatment. And then ethylene vinyl acetate copolymer/fluorographene (EVA/FG) composite films were prepared by a knife coating method. The effects of fluorination degree and content of FG on the thermal conductivity and electrical insulation of FG composites were systematically studied. An in-plane thermal conductivity of 52.9 W m -1 K -1 and through-plane thermal conductivity of 2.5 W m -1 K -1 has been achieved in the prepared composite films with the FG content of 70 wt% and the C:F ratio of 1:0.63. The prepared composite films also show excellent thermal stability to withstand repeated cooling and heating, as well as high electrical insulation and good flexibility, which makes the FG composites of great potential usage in the field of intelligent wearable devices, soft robots, flexible electronics, and so on.
随着电子设备的集成化、多功能化和轻量化，对具有优良电绝缘性和高导热性的先进热管理材料的需求日益增加。本研究采用简易低能球磨工艺和超声波处理，成功地从相应的氟化石墨原料上剥离出不同氟化程度的氟化石墨纳米片。然后采用刀涂法制备了乙烯醋酸乙烯共聚物/氟石墨烯(EVA/FG)复合薄膜。系统研究了氟化程度和FG含量对FG复合材料导热性和电绝缘性的影响。制备的FG含量为70 wt%， C:F比为1:0.63的复合膜，面内导热系数为52.9 W m -1 K -1，通面导热系数为2.5 W m -1 K -1。制备的复合薄膜还表现出优异的热稳定性，可以承受反复冷却和加热，同时具有较高的电绝缘性和良好的柔韧性，这使得FG复合材料在智能可穿戴设备、软机器人、柔性电子等领域具有很大的应用潜力。
{"title":"Flexible Ethylene-vinyl Acetate Copolymer/Fluorographene Composite Films with Excellent Thermal Conductive and Electrical Insulation Properties for Thermal Management","authors":"He Han, Haoyang Sun, Fan Lei, Jintao Huang, S. Lyu, Bangyao Wu, Meng Yang, Chentao Zhang, An Li, Zhi Zhang, D. Sun","doi":"10.30919/esmm5f523","DOIUrl":"https://doi.org/10.30919/esmm5f523","url":null,"abstract":"With electronic equipment becoming more integrated, multifunctional, and lightweight, the demand for advanced thermal management materials with excellent electrical insulation and high thermal conductivity is increasing. In this study, the fluorographene (FG) nanosheets with different degrees of fluorination were successfully exfoliated from the corresponding raw graphite fluoride by using a facile low-energy ball milling process and ultrasonic treatment. And then ethylene vinyl acetate copolymer/fluorographene (EVA/FG) composite films were prepared by a knife coating method. The effects of fluorination degree and content of FG on the thermal conductivity and electrical insulation of FG composites were systematically studied. An in-plane thermal conductivity of 52.9 W m -1 K -1 and through-plane thermal conductivity of 2.5 W m -1 K -1 has been achieved in the prepared composite films with the FG content of 70 wt% and the C:F ratio of 1:0.63. The prepared composite films also show excellent thermal stability to withstand repeated cooling and heating, as well as high electrical insulation and good flexibility, which makes the FG composites of great potential usage in the field of intelligent wearable devices, soft robots, flexible electronics, and so on.","PeriodicalId":11851,"journal":{"name":"ES Materials & Manufacturing","volume":"3 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89625859","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Jianming Yang, Bin Zhou, Dongxiao Han, Ningxin Cui, Bo Li, Jun Shen, Zhihua Zhang, Ai Du
High-precision three-dimensional (3D) printing for fabricating the arbitrarily, complex 3D microstructures with a resolution of a few microns or below are attractive across a broad range of applications. Advances have been made in the field of highprecision 3D printing, however, there are still many challenges and drawbacks that need to be overcome in order to print high-precision and high-quality 3D microstructures in a relatively flexible, low-cost and versatile way. This review summarizes some promising high-precision 3D printing technologies, including direct ink writing (DIW), two-photon polymerization (TPP), and electrochemical fabrication (EFAB). Herein, we mainly focus on the materials used in high-precision 3D printing and their applications reported so far. At the same time, we also put forward a comprehensive view of their developments and challenges, which providing a benchmark for future research and development of high-precision 3D printing technologies.
{"title":"High-Precision Three-Dimensional Printing in a Flexible, Low-Cost and Versatile Way: A Review","authors":"Jianming Yang, Bin Zhou, Dongxiao Han, Ningxin Cui, Bo Li, Jun Shen, Zhihua Zhang, Ai Du","doi":"10.30919/esmm5f526","DOIUrl":"https://doi.org/10.30919/esmm5f526","url":null,"abstract":"High-precision three-dimensional (3D) printing for fabricating the arbitrarily, complex 3D microstructures with a resolution of a few microns or below are attractive across a broad range of applications. Advances have been made in the field of highprecision 3D printing, however, there are still many challenges and drawbacks that need to be overcome in order to print high-precision and high-quality 3D microstructures in a relatively flexible, low-cost and versatile way. This review summarizes some promising high-precision 3D printing technologies, including direct ink writing (DIW), two-photon polymerization (TPP), and electrochemical fabrication (EFAB). Herein, we mainly focus on the materials used in high-precision 3D printing and their applications reported so far. At the same time, we also put forward a comprehensive view of their developments and challenges, which providing a benchmark for future research and development of high-precision 3D printing technologies.","PeriodicalId":11851,"journal":{"name":"ES Materials & Manufacturing","volume":"24 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77825865","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
P. Chaudhary, S. Chauhan, Vivek Sharma, Kuldeep Singh, Ahmad Umar
{"title":"Physico-chemical Characteristics of Amino Acids in Aqueous Solution of Amikacin Sulphate","authors":"P. Chaudhary, S. Chauhan, Vivek Sharma, Kuldeep Singh, Ahmad Umar","doi":"10.30919/esmm5f502","DOIUrl":"https://doi.org/10.30919/esmm5f502","url":null,"abstract":"","PeriodicalId":11851,"journal":{"name":"ES Materials & Manufacturing","volume":"12 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77018484","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Shaolong Yang, Beijing China Telecommunications, Jianchun Xu, Menghao Guo, Bokun Zhang, Chuwen Lan, Haihong Li, Ke Bi
Mechanical antennas have attracted wide attention due to their outstanding properties of ultra small size and low power in existing long wave communications. Here, a review of progress on mechanical antennas used in very low frequency (VLF: 3 30 kHz) and ultra low frequency (ULF: 0.3 3 kHz) is presented. The topic of focus is on the performance analysis of permanent magnet-based and piezoelectric mechanical antennas, including both radiation mechanism and signal modulation. Moreover, basic mechanical antennas are generally classified in detail, and the radiation performance of various schemes is compared. It concludes the up-to-date progress on the mechanical antennas for providing a source of inspiration towards the future better outcome of designs and applications.
{"title":"Progress on Very/Ultra Low Frequency Mechanical Antennas","authors":"Shaolong Yang, Beijing China Telecommunications, Jianchun Xu, Menghao Guo, Bokun Zhang, Chuwen Lan, Haihong Li, Ke Bi","doi":"10.30919/esmm5f497","DOIUrl":"https://doi.org/10.30919/esmm5f497","url":null,"abstract":"Mechanical antennas have attracted wide attention due to their outstanding properties of ultra small size and low power in existing long wave communications. Here, a review of progress on mechanical antennas used in very low frequency (VLF: 3 30 kHz) and ultra low frequency (ULF: 0.3 3 kHz) is presented. The topic of focus is on the performance analysis of permanent magnet-based and piezoelectric mechanical antennas, including both radiation mechanism and signal modulation. Moreover, basic mechanical antennas are generally classified in detail, and the radiation performance of various schemes is compared. It concludes the up-to-date progress on the mechanical antennas for providing a source of inspiration towards the future better outcome of designs and applications.","PeriodicalId":11851,"journal":{"name":"ES Materials & Manufacturing","volume":"41 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77700053","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A. Kulkarni, Y. Marathe, P. Patil, Sunil D. Marathe, S. D. Khairnar, H. Pathan, R. Patil
At room temperature chemical solution deposition technique has been employed for the deposition of Sb 2 Se 3 thin films. Solution based deposition of Sb 2 Se 3 crystals with variation in reaction time found to be playing a significant role in controlling the reaction rate during the deposition of Sb 2 Se 3 films. Temporal evolution of structural, morphological and optical properties of deposited Sb 2 Se 3 films were investigated using X-ray diffraction (XRD), scanning electron microscopy and UV-visible spectroscopy, respectively. Solution deposition of Sb 2 Se 3 films involves two steps: initial nucleation and crystal formation followed by growth to form final films. Increased reaction time from 30 to 120 min, deposited films showed morphological evolution for Sb 2 Se 3 nanocrystals from dense spheres to self-assembled flower-like morphology. In addition, optical energy band gap variation from 1.60 to 1.63 eV, suggest the possibility of crystal size optimization with energy band gap tunability of Sb 2 Se 3 crystals in the visible region. This is also evident from the photoluminescence studies, which reveals the luminescence intensity variation with crystal size of Sb 2 Se 3 as a function of deposition time. Optical and morphological response of Sb 2 Se 3 crystals to the reaction conditions suggests it as a suitable and potential candidate for optoelectronic applications such as photovoltaic cells, electronic nano-devices, fuel cells etc .
采用室温化学溶液沉积技术制备了sb2se3薄膜。在s2se - 3薄膜的沉积过程中，s2se - 3晶体的溶液沉积随反应时间的变化对反应速率起着重要的控制作用。采用x射线衍射仪(XRD)、扫描电镜(sem)和紫外可见光谱(UV-visible spectroscopy)对制备的sb2se3薄膜的结构、形貌和光学性能进行了研究。sb2se3薄膜的溶液沉积包括两个步骤:初始成核和晶体形成，然后生长形成最终薄膜。反应时间从30分钟增加到120分钟，制备的sb2se3纳米晶的形貌由致密的球体演变为自组装的花状形貌。此外，在1.60 ~ 1.63 eV的光能带隙变化范围内，表明Sb - 2 - Se - 3晶体在可见光区域的能带隙可调性可以优化晶体尺寸。光致发光研究也证明了这一点，该研究揭示了Sb 2 Se 3的发光强度随晶体尺寸的变化是沉积时间的函数。sb2se3晶体对反应条件的光学和形态学响应表明它是光电应用的合适和潜在的候选者，如光伏电池、电子纳米器件、燃料电池等。
{"title":"Chemical Solution Deposition of Sb2Se3 Films to Study Their Structural, Morphological and Optical Properties","authors":"A. Kulkarni, Y. Marathe, P. Patil, Sunil D. Marathe, S. D. Khairnar, H. Pathan, R. Patil","doi":"10.30919/esmm5f496","DOIUrl":"https://doi.org/10.30919/esmm5f496","url":null,"abstract":"At room temperature chemical solution deposition technique has been employed for the deposition of Sb 2 Se 3 thin films. Solution based deposition of Sb 2 Se 3 crystals with variation in reaction time found to be playing a significant role in controlling the reaction rate during the deposition of Sb 2 Se 3 films. Temporal evolution of structural, morphological and optical properties of deposited Sb 2 Se 3 films were investigated using X-ray diffraction (XRD), scanning electron microscopy and UV-visible spectroscopy, respectively. Solution deposition of Sb 2 Se 3 films involves two steps: initial nucleation and crystal formation followed by growth to form final films. Increased reaction time from 30 to 120 min, deposited films showed morphological evolution for Sb 2 Se 3 nanocrystals from dense spheres to self-assembled flower-like morphology. In addition, optical energy band gap variation from 1.60 to 1.63 eV, suggest the possibility of crystal size optimization with energy band gap tunability of Sb 2 Se 3 crystals in the visible region. This is also evident from the photoluminescence studies, which reveals the luminescence intensity variation with crystal size of Sb 2 Se 3 as a function of deposition time. Optical and morphological response of Sb 2 Se 3 crystals to the reaction conditions suggests it as a suitable and potential candidate for optoelectronic applications such as photovoltaic cells, electronic nano-devices, fuel cells etc .","PeriodicalId":11851,"journal":{"name":"ES Materials & Manufacturing","volume":"5 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90640565","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：