Radiation Physics and Chemistry最新文献

{"title":"Eu2O3-driven tailoring strategies on Al6061-Alloy for nuclear applications: A comprehensive study on structural, physical, and radiation transmission properties","authors":"Oykum Basgoz ,&nbsp;Seval Hale Guler ,&nbsp;Omer Guler ,&nbsp;Ghada ALMisned ,&nbsp;Duygu Sen Baykal ,&nbsp;G. Kilic ,&nbsp;H.O. Tekin","doi":"10.1016/j.radphyschem.2025.112949","DOIUrl":"10.1016/j.radphyschem.2025.112949","url":null,"abstract":"<div><div>In this study, Al6061–Eu₂O₃ composites were fabricated via mechanical alloying and systematically characterized using X-ray diffraction, scanning electron microscopy, and energy-dispersive X-ray spectroscopy to evaluate structural and compositional features. The incorporation of Eu₂O₃ in varying weight percentages (1–20 wt%) was confirmed by XRD, revealing phase retention and crystallite refinement, while SEM–EDS analyses indicated uniform elemental distribution at low doping and localized clustering at higher reinforcement levels. Radiation shielding properties were comprehensively assessed through mass and linear attenuation coefficients, half value layer, effective atomic number, fast neutron removal cross section, buildup factors, and photon transmission factors. The results demonstrated a strong correlation between increasing Eu₂O₃ content and improved shielding performance. The E20 composite exhibited a mass attenuation coefficient of 22.33 cm²/g at 0.015 MeV, over threefold higher than the base alloy, and fast neutron removal cross section improved by 22.5 % compared to Al6061 alone. Additionally, EBF and EABF values decreased significantly, confirming reduced secondary photon build-up. These findings validate the effectiveness of Eu₂O₃ as a reinforcement phase for tailoring Al6061 for multifunctional applications, particularly in nuclear, aerospace, and radiological environments requiring lightweight materials with superior gamma and neutron attenuation.</div></div>","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"236 ","pages":"Article 112949"},"PeriodicalIF":2.8,"publicationDate":"2025-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144083799","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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}

{"title":"Empirical formula for Mass attenuation coefficient of lead and bismuth nano materials","authors":"B.M. Chandrika ,&nbsp;N. Sowmya ,&nbsp;L. Seenappa ,&nbsp;H.C. Manjunatha ,&nbsp;K.N. Sridhar ,&nbsp;A.J. Clement Lourduraj","doi":"10.1016/j.radphyschem.2025.112894","DOIUrl":"10.1016/j.radphyschem.2025.112894","url":null,"abstract":"<div><div>This study proposes an empirical formula for the mass attenuation coefficient (<span><math><mrow><mi>μ</mi><mo>/</mo><mi>ρ</mi></mrow></math></span>) of lead and bismuth nanoparticles, accounting for photon energy and material density through quadratic energy terms and density-dependent coefficients. This formula is applicable for the photon energy range 0.365 to 1.332 MeV. Validation against various nanoparticle-based compounds, including barium bismuth oxide borate and lead nickel copper, demonstrates the formula’s accuracy. The proposed formula is the first of its kind which produces mass attenuation coefficient for nanoparticles. The model offers a reliable framework for designing high-performance radiation shielding materials, addressing key needs in nuclear physics, medical imaging and dosimetry applications.</div></div>","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"236 ","pages":"Article 112894"},"PeriodicalIF":2.8,"publicationDate":"2025-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144083795","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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}

{"title":"A Monte Carlo simulation surveying direct DNA damage using different biologically relevant electron energy, absorbed dose, electron tracking and base pair cutoff","authors":"Mariam M. Ahmed ,&nbsp;M. Ali ,&nbsp;Mona Moustafa ,&nbsp;Magdy M. Khalil","doi":"10.1016/j.radphyschem.2025.112940","DOIUrl":"10.1016/j.radphyschem.2025.112940","url":null,"abstract":"<div><div>X-ray or heavy ion beams are used in radiotherapy to target cancers and damage DNA. The primary cause of this damage is secondary low energy electrons. This work presents the analysis of DNA molecular damage including single (SSB) and double breaks (DSB) using an atomistic DNA model and track structure physics models. Considerations have been made on the influence of electron energy, electron dose, tracking cutoff as well as base pair cutoff. We simulated a model of atomistic DNA in vacuum, simulating 3 base pairs for each energy which is ranging from 0.04 to 5 keV. The current work showed a significant energy range in the direct interaction between low energy electrons and DNA. By incorporating information about indirect effects, the combination of data allows for the creation of a comprehensive global understanding of the impact of electrons on the biological target. The electron energy range of 100–600 eV has various advantages when used to irradiate cancer cells. This is because energy deposition occurs in dimensions that are like those of DNA strands and nucleosomes, showing that the highest yields of SSB and DSB occurred within the 300–600 eV range, peaking at 400 eV and 500 eV. The most common energy range for SSBs and DSBs was found between 300 and 600 eV. Lower energy and base pair cut-offs lead to greater damage but raising the energy cut-off from 10 to 20 eV greatly lowers the quantity of SSBs and DSBs per electron.</div></div>","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"236 ","pages":"Article 112940"},"PeriodicalIF":2.8,"publicationDate":"2025-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144083800","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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}

{"title":"The effects of Zn and Sr Co-doping on local structure, dielectric properties, and bioactivity of hydroxyapatite porous materials","authors":"Arthit Ruttakorn ,&nbsp;Siriwan Tocho ,&nbsp;Rattikorn Yimnirun ,&nbsp;Thanit Saisopa ,&nbsp;Tanachat Eknapakul ,&nbsp;Prae Chirawatkul ,&nbsp;Russameeruk Noonurak ,&nbsp;Atipong Bootchanont","doi":"10.1016/j.radphyschem.2025.112928","DOIUrl":"10.1016/j.radphyschem.2025.112928","url":null,"abstract":"<div><div>Hydroxyapatite (HA) is a vital biomaterial widely used in bone implants and orthodontics due to its excellent biocompatibility. In this study, Sr and Zn co-doped HA was synthesized using the sol-gel combustion method and cast into porous materials. Samples containing 5 mol% Sr and varying Zn concentrations (0, 1, 3, and 5 mol%) were labeled as 0ZnSr-HA, 1ZnSr-HA, 3ZnSr-HA, and 5ZnSr-HA, respectively. The crystal and local structures were analyzed using X-ray diffraction (XRD) and X-ray absorption near-edge structure (XANES), revealing that Zn²⁺ and Sr²⁺ ions substitute at the Ca1 and Ca2 sites within the hydroxyapatite lattice. The dielectric properties were investigated over a frequency range of 20–10³ Hz, where 3ZnSr-HA exhibited the highest dielectric constant of 39.74, suggesting its potential to support bone growth during simulated body fluid (SBF) testing. The microstructure and elemental composition of the samples were examined using scanning electron microscopy (SEM) and energy-dispersive X-ray analysis (EDX). After 2 weeks of immersion in SBF, 3ZnSr-HA demonstrated significant apatite growth, highlighting the ability of Zn and Sr co-substitution to enhance the HA structure and improve bone regeneration efficiency. This study confirms the potential of Sr- and Zn-doped HA as a promising material for biomedical applications.</div></div>","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"236 ","pages":"Article 112928"},"PeriodicalIF":2.8,"publicationDate":"2025-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144083696","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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}

{"title":"A statistical evaluation of material discrimination approaches in cargo inspection systems","authors":"Hossein Barati ,&nbsp;Seyed AmirHossein Feghhi ,&nbsp;Rouhollah Azimirad","doi":"10.1016/j.radphyschem.2025.112873","DOIUrl":"10.1016/j.radphyschem.2025.112873","url":null,"abstract":"<div><div>In X-ray inspection systems employing dual-energy capabilities, material discrimination primarily centers on three methodologies based on curves: the <span><math><mi>α</mi></math></span> curve, the <span><math><mi>R</mi></math></span> curve, and the <span><math><mrow><mi>H</mi><mo>−</mo><mi>L</mi></mrow></math></span> curve. Despite extensive research in this field, there remains ambiguity regarding the comparative effectiveness of these methods under different conditions. This study aims to evaluate the accuracy of material discrimination using a standard cargo inspection system for four wedge-shaped materials. Multiple experiments were conducted, where experimental data were mapped onto the coordinate system for all three discrimination methods, and discrimination curves were generated using cubic interpolation. Regular residual analysis and statistical tests, including ANOVA and Tukey HSD, were performed to evaluate the effectiveness of the <span><math><mi>R</mi></math></span>, <span><math><mi>α</mi></math></span>, and <span><math><mrow><mi>H</mi><mo>−</mo><mi>L</mi></mrow></math></span> methods. No statistically significant differences in the performance of these methods were found. Unlike some previous studies where one method was favored over another, no inherent superiority of any particular method was observed in this research. Additionally, combining these methods yields no significant gains in accuracy or efficiency, and their simultaneous use is not recommended due to increased computational costs. The analysis of sample thickness effects revealed higher success rates for thicker samples, though no method outperformed the others across thickness ranges. These findings suggest that the choice of method should be guided by practical considerations rather than assumptions of inherent superiority.</div></div>","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"236 ","pages":"Article 112873"},"PeriodicalIF":2.8,"publicationDate":"2025-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143946636","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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}

{"title":"Dosimetric evaluation of 6 MV photon beams in small fields using PRIMO-penEasy Monte Carlo","authors":"Nataly Díaz ,&nbsp;Amaia Villa Abaunza ,&nbsp;Jorge Muñoz ,&nbsp;José Manuel Udías ,&nbsp;Paula Ibáñez","doi":"10.1016/j.radphyschem.2025.112904","DOIUrl":"10.1016/j.radphyschem.2025.112904","url":null,"abstract":"<div><div>Dosimetric validation of clinical radiotherapy plans for small fields requires high-precision instrumentation to ensure accuracy and spatial resolution. This study proposes a combination of PRIMO and penEasy Monte Carlo simulators to address scenarios where direct measurements are impractical, challenging, or yield inconsistent results due to detector limitations.</div><div>We compared three dosimetric tools: A Semiflex ionization chamber PTW (model 31010) within a water-filled acrylic tank; EBT3 radiochromic films positioned between solid water layers; and PRIMO-PenEasy simulations. Experiments were performed at San Ignacio University Hospital in Bogota, Colombia, with dose measurements in two small fields and one conventional field for an Axesse-type linear accelerator.</div><div>Results indicate that EBT3 radiochromic film show better agreement with MC simulation than the Semiflex ionization chamber, likely due to the chamber dose averaging effect across its detection volume. Additionally, variations in off-axis ratios were noted in both crossplane and inplane directions with more pronounced discrepancies observed in small fields compared to the conventional field. Overall, PRIMO-PenEasy MC simulations demonstrated accurate dose distributions and can be used as a viable for dosimetric validation in small photon fields.</div></div>","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"236 ","pages":"Article 112904"},"PeriodicalIF":2.8,"publicationDate":"2025-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144066392","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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}

{"title":"Metal-organic frameworks with high photoluminescence quantum yield for X-ray scintillators","authors":"Siqi Yan ,&nbsp;Qian Yang ,&nbsp;Shuya Zhang ,&nbsp;Jiayi Zhang ,&nbsp;Tianping Wang ,&nbsp;Jia Li ,&nbsp;Yanlong Wang ,&nbsp;Aiping Jin ,&nbsp;Xiaohong Xiong ,&nbsp;Xiaoping Ouyang ,&nbsp;Hanzhou Liu ,&nbsp;Shuao Wang","doi":"10.1016/j.radphyschem.2025.112916","DOIUrl":"10.1016/j.radphyschem.2025.112916","url":null,"abstract":"<div><div>Here, we report a Pb-based metal-organic framework, Pb((TPA)DMF)₂·H₂O (denoted as <strong>Pb-TPA</strong>, where TPA stands for terephthalic acid and DMF for N, N-dimethylformamide), synthesized under mild synthesis conditions (353 K, 3 days), as an X-ray scintillator. <strong>Pb-TPA</strong> features persistent luminescent centers and an impressive photoluminescence quantum yield of 86.7 %. Over a wide dose rate range 0.97–26.50 Gy min⁻¹ (dose to air), <strong>Pb-TPA</strong> demonstrates a robust linear response to X-ray radiation with a detection limit of 0.531 μGy s⁻¹. In addition, <strong>Pb-TPA</strong> exhibits a 60-fold enhancement in detection sensitivity compared to commercial PbWO₄ (PWO) crystals.</div></div>","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"236 ","pages":"Article 112916"},"PeriodicalIF":2.8,"publicationDate":"2025-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144066397","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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}

{"title":"Potential application of slice heavy ion beam radiography by energy difference method for future theranostic of carbon ions therapy","authors":"Zexian Zhou ,&nbsp;Rui Cheng ,&nbsp;Jiangtao Zhao ,&nbsp;Yuyu Wang ,&nbsp;Yu Lei ,&nbsp;Guodong Wang ,&nbsp;Lulin Shi ,&nbsp;Zhao Wang ,&nbsp;Jingfu Zhang ,&nbsp;Xuejian Jin ,&nbsp;Yanhong Chen ,&nbsp;Xiaoxia Wu ,&nbsp;Yanshi Zhang ,&nbsp;Liangwen Chen ,&nbsp;Yongtao Zhao ,&nbsp;Jie Yang ,&nbsp;Maogen Su ,&nbsp;Guoqing Xiao","doi":"10.1016/j.radphyschem.2025.112921","DOIUrl":"10.1016/j.radphyschem.2025.112921","url":null,"abstract":"<div><div>Carbon ions therapy has become a globally prevalent treatment due to its highly efficiency in tumor eradication by including DNA double-strand breaks within the Bragg peak region, while avoiding the need for invasive surgery. A pre-treatment assessment using X-ray technology is necessary to draw the tumor morphology for carbon ions impinging. However, metal implants adjacent to tumor area often generate heavy artifacts during CT scans, compromising accurate tumor evaluation. We propose a radiography method utilizing high-energy carbon ion beams, which exhibit stronger penetration and density sensitivity compared to X-ray. In this study, we investigate the important physical properties of marginal range (where Bragg peaks location) radiography by using high energy carbon ions beams incidence different morphology targets at the Heavy Ion Research Facility in Lanzhou (HIRFL). By modulating the beam energy, the detailed interior structures of targets are visualized slice-by-layer. The results demonstrated that the marked copper plate and the CPU targets achieved density resolution of about 1.6 % at 10.9 g/cm² and spatial resolution of 500 <span><math><mrow><mi>μ</mi></mrow></math></span> m. For the ball-point pen, the sequence radiographs of different depth features are presented. An agreement is found between the Geant4 simulation and the experimental results. Both low-Z and high-Z material components in the ball-point pen are distinctly differentiated, and a three-dimensional visual target is reconstructed. Through in vitro experiment, we validate the important physical properties of marginal range radiography and extending its application to tumor cases with high Z metal implants. The excellent resolution power is expected to solve the tumor morphology caused by metal artifacts in CIRT treatment. Such combination of marginal range radiography with Bragg peak cancer therapy provides a unique solution for the future development of carbon ion theranostic.</div></div>","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"236 ","pages":"Article 112921"},"PeriodicalIF":2.8,"publicationDate":"2025-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143936265","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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}

{"title":"Degradation of target pollutants under simultaneous competition from coexisting compounds: Electron-beam treatment of a real hair dye wastewater","authors":"Qiburi Bao ,&nbsp;Boming Yu ,&nbsp;Wangrui Li ,&nbsp;Miao Yang ,&nbsp;Zhen Dong ,&nbsp;Long Zhao","doi":"10.1016/j.radphyschem.2025.112929","DOIUrl":"10.1016/j.radphyschem.2025.112929","url":null,"abstract":"<div><div>Water pollution resulting from the extensive production and consumption of hair dyes has been threatening human health and aquatic ecosystems globally. Gaining knowledge on the presence of compounds in real hair dye wastewater and developing efficient treatment are emerging issues. This paper studies the electron beam irradiation of a real hair dye industrial wastewater. The COD_Cr of the industrial wastewater was reduced by 35 % through EB irradiation at 9 kGy. Four dyestuff intermediates (phenol, 5-amino-<em>o</em>-cresol, 5-amino-4-chloro-<em>o</em>-cresol and 5-amino-6-chloro-<em>o</em>-cresol) were identified as the target pollutants through compositional analysis of the wastewater. The removals of target pollutants in single-component solutions reached 75.7 %–89.7 % at 9 kGy The influence of coexisting background components on the degradation of targets was investigated and the interaction between different targets was evaluated during the irradiation treatment. Compared with pure single solutions, the required doses for 50 % removal of the targets in the wastewater increased by 0.1–5.8 times. Quantitative assessment of the competing effects of non-target components and the selectivity of reactive species is performed. ^<img>OH and ^<img>O₂⁻ show much lower selectivity toward the targets than reducing radicals (e_aq⁻ and ^<img>H). Among them, ^<img>O₂⁻ exhibits the lowest selectivity toward phenol with a log<em>f</em> value of −0.51. The main breakdown products of the target pollutants are quinones, diphenols and carboxylic acids.</div></div>","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"236 ","pages":"Article 112929"},"PeriodicalIF":2.8,"publicationDate":"2025-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144066398","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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}

{"title":"Degradation mechanism of Cascode GaN high electron mobility transistors device with high energy protons and heavy ions synergistic irradiations","authors":"Yuxin Lu ,&nbsp;Dongping Yang ,&nbsp;Yuanyuan Xue ,&nbsp;Rongxing Cao ,&nbsp;Chengan Wan ,&nbsp;Xuelin Yang ,&nbsp;Dan Han ,&nbsp;Xianghua Zeng ,&nbsp;Yuxiong Xue","doi":"10.1016/j.radphyschem.2025.112933","DOIUrl":"10.1016/j.radphyschem.2025.112933","url":null,"abstract":"<div><div>In this study, the synergistic irradiation effects on Cascode GaN high electron mobility transistors (HEMTs) subjected to 80 MeV proton and Ge ion irradiation with a linear energy transfer (LET) of 37 MeV cm²·mg⁻¹ were investigated. The experimental results demonstrated that such synergistic irradiation leads to a 10 % reduction in the single-event burnout (SEB) threshold voltage. Geant4 and TCAD simulations revealed that high-energy proton irradiation induces a significant number of displacement defects within the GaN HEMT structure. During subsequent Ge ion irradiation, these pre-existing displacement defects near the gate region act as electron traps, forming negatively charged defect centers. This results in an enhanced electric field intensity within the channel, facilitating avalanche multiplication of carriers. Consequently, a large number of holes accumulate beneath the gate, lowering the electron barrier in the channel. This condition promotes electron injection into leakage paths via the tunneling effect, thereby forming a burnout channel between the gate-drain region of the depleted GaN HEMT and the source of the Si MOSFET. As a result, the Cascode GaN HEMT device becomes susceptible to SEB at a lower operating voltage. These findings provide important theoretical insights into SEB behavior and contribute to the reliability assessment of Cascode GaN HEMT devices in radiation environments.</div></div>","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"236 ","pages":"Article 112933"},"PeriodicalIF":2.8,"publicationDate":"2025-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143936263","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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}