Pub Date : 2023-09-06DOI: 10.1209/0295-5075/acf72f
M. Le Berre, Yves Pomeau
Using a recently proposed closure for the Boussinesq-Reynolds turbulent stress we re-derive Prandtl's result for the turbulent wake width behind blunt bodies. We show that it is valid for a body of arbitrary shape, but only for wakes due to a drag oriented parallel to the incoming flow. If the geometry of the body resisting the flow lacks symmetries forbidding it, the force on the body has also a component orthogonal to the incoming velocity, called lift, that allows, for instance, planes to fly. Using our closure theory we show that this lift generates a wake wider than the drag, with a width growing like the one-half power of the distance to the body, instead of the one-third in the case of drag only. This has important consequences as it leads to a change of structure of the wake that remains turbulent all the way to infinity.
{"title":"Turbulent far wake of a body of arbitrary shape","authors":"M. Le Berre, Yves Pomeau","doi":"10.1209/0295-5075/acf72f","DOIUrl":"https://doi.org/10.1209/0295-5075/acf72f","url":null,"abstract":"Using a recently proposed closure for the Boussinesq-Reynolds turbulent stress we re-derive Prandtl's result for the turbulent wake width behind blunt bodies. We show that it is valid for a body of arbitrary shape, but only for wakes due to a drag oriented parallel to the incoming flow. If the geometry of the body resisting the flow lacks symmetries forbidding it, the force on the body has also a component orthogonal to the incoming velocity, called lift, that allows, for instance, planes to fly. Using our closure theory we show that this lift generates a wake wider than the drag, with a width growing like the one-half power of the distance to the body, instead of the one-third in the case of drag only. This has important consequences as it leads to a change of structure of the wake that remains turbulent all the way to infinity.","PeriodicalId":11738,"journal":{"name":"EPL","volume":" ","pages":""},"PeriodicalIF":1.8,"publicationDate":"2023-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41844714","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-09-05DOI: 10.1209/0295-5075/acf6dd
Dina Abuzaid, Mir Asma
The characteristics of an optical beam propagating in a medium should be preserved for many applications related to fiber optic communication. The phenomenon of self-trapping due to adequate balance among linear and nonlinear effects may preserve the characteristics of an optical beam. In this work, we perform a theoretical investigation on the propagation of a spatiotemporal elliptical super-Gaussian beam in a Kerr nonlinear metamaterial waveguide. We follow the Lagrangian variational method and numerical analysis using the appropriate trial function for the input elliptical super-Gaussian beam and analyze the self-trapping and deformation of the propagating beam in metamaterials. We obtain special conditions to observe the self-trapping and stabilize the dynamics of the elliptical super-Gaussian beam in both negative and positive index regimes of the metamaterial. It is found that in the negative index regime of metamaterial, the phenomenon of self-trapping may exist in the normal dispersion regime with defocusing Kerr nonlinearity. However similar to the conventional medium, the robust balance among the anomalous dispersion and focussing Kerr nonlinearity supports the self-trapping in the positive index regime. There is a critical optical power for the input beam to observe the pulse trapping phenomena. This power is found to be a function of the super-Gaussian parameter as well as the ellipticity of the input beam. The period of self-trapping is also a function of the super-Gaussian parameter and the ellipticity of the input beam.
{"title":"Propagation dynamics of elliptical super-Gaussian bullets in nonlinear metamaterial waveguide","authors":"Dina Abuzaid, Mir Asma","doi":"10.1209/0295-5075/acf6dd","DOIUrl":"https://doi.org/10.1209/0295-5075/acf6dd","url":null,"abstract":"The characteristics of an optical beam propagating in a medium should be preserved for many applications related to fiber optic communication. The phenomenon of self-trapping due to adequate balance among linear and nonlinear effects may preserve the characteristics of an optical beam. In this work, we perform a theoretical investigation on the propagation of a spatiotemporal elliptical super-Gaussian beam in a Kerr nonlinear metamaterial waveguide. We follow the Lagrangian variational method and numerical analysis using the appropriate trial function for the input elliptical super-Gaussian beam and analyze the self-trapping and deformation of the propagating beam in metamaterials. We obtain special conditions to observe the self-trapping and stabilize the dynamics of the elliptical super-Gaussian beam in both negative and positive index regimes of the metamaterial. It is found that in the negative index regime of metamaterial, the phenomenon of self-trapping may exist in the normal dispersion regime with defocusing Kerr nonlinearity. However similar to the conventional medium, the robust balance among the anomalous dispersion and focussing Kerr nonlinearity supports the self-trapping in the positive index regime. There is a critical optical power for the input beam to observe the pulse trapping phenomena. This power is found to be a function of the super-Gaussian parameter as well as the ellipticity of the input beam. The period of self-trapping is also a function of the super-Gaussian parameter and the ellipticity of the input beam.","PeriodicalId":11738,"journal":{"name":"EPL","volume":" ","pages":""},"PeriodicalIF":1.8,"publicationDate":"2023-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45354663","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-09-01DOI: 10.1209/0295-5075/acf48f
R. Vitória, Kleber Anderson T. da Silva
Original article: EPL, 142 (2023) 22002.
原文：EPL，142（2023）22002。
{"title":"Erratum: On the doubly anharmonic oscillator in an elastic environment in the presence of a point-like defect","authors":"R. Vitória, Kleber Anderson T. da Silva","doi":"10.1209/0295-5075/acf48f","DOIUrl":"https://doi.org/10.1209/0295-5075/acf48f","url":null,"abstract":"Original article: EPL, 142 (2023) 22002.","PeriodicalId":11738,"journal":{"name":"EPL","volume":" ","pages":""},"PeriodicalIF":1.8,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49377218","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-09-01DOI: 10.1209/0295-5075/acf39a
Na Wang, Zhihai Rong, Wen Yang
In this work, we improve the Hegselmann-Krause model (HK model) by combining the agent's stubbornness and the quantitative impact of stubborn agents on the evolution of other agents’ opinions. We divide stubborn agents into expert stubborn agents, environmentally stubborn agents and intrinsically stubborn agents based on the impact weight and agent's characteristics. We simulate the evolution of opinions of the improved HK model, and find that it is closer to reality. We also study the impact of the influence coefficient and the proportion of intrinsically stubborn agents on the stabilization time, and find that the presence of non-expert stubborn agents reduces the rate of convergence of opinions. Finally, we verify the effectiveness of the improved HK model by two real social events.
{"title":"Opinion dynamics of improved Hegselmann-Krause model with agent's stubbornness and stubborn agents","authors":"Na Wang, Zhihai Rong, Wen Yang","doi":"10.1209/0295-5075/acf39a","DOIUrl":"https://doi.org/10.1209/0295-5075/acf39a","url":null,"abstract":"In this work, we improve the Hegselmann-Krause model (HK model) by combining the agent's stubbornness and the quantitative impact of stubborn agents on the evolution of other agents’ opinions. We divide stubborn agents into expert stubborn agents, environmentally stubborn agents and intrinsically stubborn agents based on the impact weight and agent's characteristics. We simulate the evolution of opinions of the improved HK model, and find that it is closer to reality. We also study the impact of the influence coefficient and the proportion of intrinsically stubborn agents on the stabilization time, and find that the presence of non-expert stubborn agents reduces the rate of convergence of opinions. Finally, we verify the effectiveness of the improved HK model by two real social events.","PeriodicalId":11738,"journal":{"name":"EPL","volume":" ","pages":""},"PeriodicalIF":1.8,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46614568","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-09-01DOI: 10.1209/0295-5075/acf409
N. Rouabhia, M. Merad, B. Hamil
In this research, we shall present the Klein-Gordon and Dirac oscillators in the framework of the generalized Dunkl derivative with two parameters by using the Cartesian coordinates, the eigenvalues of energy and eigenfunctions are obtained. The thermodynamic properties are discussed and plotted graphically.
{"title":"The Klein-Gordon and Dirac oscillators with generalized Dunkl derivative","authors":"N. Rouabhia, M. Merad, B. Hamil","doi":"10.1209/0295-5075/acf409","DOIUrl":"https://doi.org/10.1209/0295-5075/acf409","url":null,"abstract":"In this research, we shall present the Klein-Gordon and Dirac oscillators in the framework of the generalized Dunkl derivative with two parameters by using the Cartesian coordinates, the eigenvalues of energy and eigenfunctions are obtained. The thermodynamic properties are discussed and plotted graphically.","PeriodicalId":11738,"journal":{"name":"EPL","volume":" ","pages":""},"PeriodicalIF":1.8,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44743399","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-09-01DOI: 10.1209/0295-5075/acf60b
Yudan Li, Ying Wu, C.J. Huang, Zhihao Liu, M. Pan
In this study, a neural network method is proposed for solving the inverse problem in the measurement of inner-shell ionization cross-sections using the thick-target method. It was applied to calculate the K-shell ionization cross-section of silicon (Si) from positron impacts in the energy range from 4.5 to 9 keV, using a Monte Carlo simulation program called PENELOPE to construct a comprehensive characteristic X-ray yield and cross-section database, serving as a foundation for training the neural network. The experimental values are compared with those obtained using regularization, yield differential, and distorted-wave Born approximation (DWBA) theoretical models. Our findings reveal that the cross-section results obtained from all three algorithms are in good agreement with the theoretical DWBA values within the error range. Moreover, our study highlights the superiority of the neural network algorithm in solving ill-posed problems, compared with traditional regularization algorithms and the yield differential method. Furthermore, we re-analyse the experimental data of electron-induced ionization cross-sections on a pure thick Si target in the energy range from 3 to 25 keV, which were originally obtained by Zhu et al. who used a regularization method. The reprocessed cross-sections obtained in this study exhibit good agreement with the reported results within the error range. To the best of our knowledge, this is the first experimental report of the K-shell ionization cross-sections of Si from positron impact.
{"title":"Neural-network–based algorithm for the inverse problem of measuring K-shell ionization cross-sections of Si induced by 3–25 keV electrons and 4.5–9 keV positrons using the thick-target method","authors":"Yudan Li, Ying Wu, C.J. Huang, Zhihao Liu, M. Pan","doi":"10.1209/0295-5075/acf60b","DOIUrl":"https://doi.org/10.1209/0295-5075/acf60b","url":null,"abstract":"In this study, a neural network method is proposed for solving the inverse problem in the measurement of inner-shell ionization cross-sections using the thick-target method. It was applied to calculate the K-shell ionization cross-section of silicon (Si) from positron impacts in the energy range from 4.5 to 9 keV, using a Monte Carlo simulation program called PENELOPE to construct a comprehensive characteristic X-ray yield and cross-section database, serving as a foundation for training the neural network. The experimental values are compared with those obtained using regularization, yield differential, and distorted-wave Born approximation (DWBA) theoretical models. Our findings reveal that the cross-section results obtained from all three algorithms are in good agreement with the theoretical DWBA values within the error range. Moreover, our study highlights the superiority of the neural network algorithm in solving ill-posed problems, compared with traditional regularization algorithms and the yield differential method. Furthermore, we re-analyse the experimental data of electron-induced ionization cross-sections on a pure thick Si target in the energy range from 3 to 25 keV, which were originally obtained by Zhu et al. who used a regularization method. The reprocessed cross-sections obtained in this study exhibit good agreement with the reported results within the error range. To the best of our knowledge, this is the first experimental report of the K-shell ionization cross-sections of Si from positron impact.","PeriodicalId":11738,"journal":{"name":"EPL","volume":" ","pages":""},"PeriodicalIF":1.8,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48372292","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-09-01DOI: 10.1209/0295-5075/acf60c
Fulvio Melia
The recent release of the final, complete survey of Lyman-α baryonic acoustic oscillation measurements provides the most significant and accurate data base for studying cosmic geometry at an effective redshift , which is inaccessible to other sources. In this paper, we use these data to select among four distinct cosmologies: Planck ΛCDM, the universe, the Milne universe and the Einstein-de Sitter universe. Given the breadth and depth of the Lyman-α study, this BAO measurement alone provides a strong model comparison, complementary to previous studies that combined Lyman-α data with measurements at lower redshifts. Though both approaches are useful, the latter tends to dilute the disparity between model predictions and the observations. We therefore examine how the models compare to each other strictly based on the BAO scale measured in the Lyman-α forest and background quasars. We find that the Milne universe and the Einstein-de Sitter universe are strongly ruled out by these data. There is also strong evidence disfavoring the standard model. The Lyman-α measurements are completely consistent with the cosmic geometry predicted by . As such, evidence continues to grow that the zero active mass condition from general relativity ought to be an essential ingredient in ΛCDM.
{"title":"Model selection with baryonic acoustic oscillations in the Lyman-α forest","authors":"Fulvio Melia","doi":"10.1209/0295-5075/acf60c","DOIUrl":"https://doi.org/10.1209/0295-5075/acf60c","url":null,"abstract":"The recent release of the final, complete survey of Lyman-α baryonic acoustic oscillation measurements provides the most significant and accurate data base for studying cosmic geometry at an effective redshift , which is inaccessible to other sources. In this paper, we use these data to select among four distinct cosmologies: Planck ΛCDM, the universe, the Milne universe and the Einstein-de Sitter universe. Given the breadth and depth of the Lyman-α study, this BAO measurement alone provides a strong model comparison, complementary to previous studies that combined Lyman-α data with measurements at lower redshifts. Though both approaches are useful, the latter tends to dilute the disparity between model predictions and the observations. We therefore examine how the models compare to each other strictly based on the BAO scale measured in the Lyman-α forest and background quasars. We find that the Milne universe and the Einstein-de Sitter universe are strongly ruled out by these data. There is also strong evidence disfavoring the standard model. The Lyman-α measurements are completely consistent with the cosmic geometry predicted by . As such, evidence continues to grow that the zero active mass condition from general relativity ought to be an essential ingredient in ΛCDM.","PeriodicalId":11738,"journal":{"name":"EPL","volume":" ","pages":""},"PeriodicalIF":1.8,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49636758","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-08-31DOI: 10.1209/0295-5075/acf59d
A. Kalitenko
The article presents a study of the higher-harmonics radiation suppression in tapered free-electron lasers (FELs) with phase shifters. To increase the power and efficiency of the FEL, tapering is used —a decrease in the parameter K along the laser axis. Undulator tapering is one of the methods for designing multi-terawatt X-ray FELs (XFELs), which are necessary for research in the field of non-linear optics. In the FELs, in addition to the fundamental harmonic there are also higher harmonics of the radiation field. In this article, we propose methods to suppress the higher harmonics of radiation to improve the quality of radiation for the study of the higher-harmonic generation in crystals, etc. Our method can be transferred to other systems as well.
{"title":"Analysis of the higher-harmonics radiation suppression in tapered free-electron lasers with phase shifters","authors":"A. Kalitenko","doi":"10.1209/0295-5075/acf59d","DOIUrl":"https://doi.org/10.1209/0295-5075/acf59d","url":null,"abstract":"The article presents a study of the higher-harmonics radiation suppression in tapered free-electron lasers (FELs) with phase shifters. To increase the power and efficiency of the FEL, tapering is used —a decrease in the parameter K along the laser axis. Undulator tapering is one of the methods for designing multi-terawatt X-ray FELs (XFELs), which are necessary for research in the field of non-linear optics. In the FELs, in addition to the fundamental harmonic there are also higher harmonics of the radiation field. In this article, we propose methods to suppress the higher harmonics of radiation to improve the quality of radiation for the study of the higher-harmonic generation in crystals, etc. Our method can be transferred to other systems as well.","PeriodicalId":11738,"journal":{"name":"EPL","volume":" ","pages":""},"PeriodicalIF":1.8,"publicationDate":"2023-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41778413","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-08-30DOI: 10.1209/0295-5075/acf520
Dandan Li, Wenqi Qian, Xiaoxiao Sun, Dun Han
Opinions, representing individual thoughts and attitudes, are ubiquitous in societal interactions. The present study investigates the influence of diverse friendships and varying degrees of interpersonal impact on opinion dynamics. Considering that the nature of interactions among friends is contingent upon their level of intimacy, we categorize friendships into three distinct classifications: fixed friend relations (strong links), non-fixed unidirectional friend relations, and non-fixed bidirectional friend relations (both denoting weak links). Employing numerical simulations on both synthetic and real-world networks, our results indicate that individuals exhibiting higher forgetting rates, diminished social interaction intensities, and reduced influence strengths are more inclined to establish cohesive opinions. Inversely, attaining consensus within an actual social network necessitates augmented forgetting rates, curtailed social interaction intensities, and decreased inter-individual influence.
{"title":"Impact of varied friendships and influence weights on opinion dynamics","authors":"Dandan Li, Wenqi Qian, Xiaoxiao Sun, Dun Han","doi":"10.1209/0295-5075/acf520","DOIUrl":"https://doi.org/10.1209/0295-5075/acf520","url":null,"abstract":"Opinions, representing individual thoughts and attitudes, are ubiquitous in societal interactions. The present study investigates the influence of diverse friendships and varying degrees of interpersonal impact on opinion dynamics. Considering that the nature of interactions among friends is contingent upon their level of intimacy, we categorize friendships into three distinct classifications: fixed friend relations (strong links), non-fixed unidirectional friend relations, and non-fixed bidirectional friend relations (both denoting weak links). Employing numerical simulations on both synthetic and real-world networks, our results indicate that individuals exhibiting higher forgetting rates, diminished social interaction intensities, and reduced influence strengths are more inclined to establish cohesive opinions. Inversely, attaining consensus within an actual social network necessitates augmented forgetting rates, curtailed social interaction intensities, and decreased inter-individual influence.","PeriodicalId":11738,"journal":{"name":"EPL","volume":" ","pages":""},"PeriodicalIF":1.8,"publicationDate":"2023-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48666195","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A space-borne gravitational wave detector requires the test mass (TM) to be in an ultra-low disturbance state. However, magnetic field fluctuations will disturb the TM and produce acceleration noise. To assess the influence of the magnetic field on the TM, it is necessary to monitor and reconstruct the magnetic field near the TM in real time. In this paper, a distance weighting multipole expansion (DWME) method was proposed, and its magnetic field reconstruction accuracy was analyzed. The results demonstrated that the proposed DWME method significantly improved the reconstruction precision compared to traditional methods. It reduced the average reconstruction error of the sensitive axial magnetic field from 1.2% to 0.8% and the maximum error from 16% to 8%. In the in-orbit situation, the DWME method also outperforms traditional methods.
{"title":"Magnetic field recovery technique based on distance weighting multipole expansion method","authors":"Binbin Liu, Zhen Yang, Li-e Qiang, Xiaodong Peng, Xiaoshan Ma, Peng Xu, Ziren Luo, Wenlin Tang, Yuzhu Zhang, Chen Gao","doi":"10.1209/0295-5075/acf51f","DOIUrl":"https://doi.org/10.1209/0295-5075/acf51f","url":null,"abstract":"A space-borne gravitational wave detector requires the test mass (TM) to be in an ultra-low disturbance state. However, magnetic field fluctuations will disturb the TM and produce acceleration noise. To assess the influence of the magnetic field on the TM, it is necessary to monitor and reconstruct the magnetic field near the TM in real time. In this paper, a distance weighting multipole expansion (DWME) method was proposed, and its magnetic field reconstruction accuracy was analyzed. The results demonstrated that the proposed DWME method significantly improved the reconstruction precision compared to traditional methods. It reduced the average reconstruction error of the sensitive axial magnetic field from 1.2% to 0.8% and the maximum error from 16% to 8%. In the in-orbit situation, the DWME method also outperforms traditional methods.","PeriodicalId":11738,"journal":{"name":"EPL","volume":" ","pages":""},"PeriodicalIF":1.8,"publicationDate":"2023-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48357779","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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