期刊：
Journal of Hazardous Materials,2024年467:133741 ISSN：0304-3894
通讯作者：
Huang, Qunying;Ning, Shunyan
作者机构：
[Huang, Qunying; Zhang, Shichang] Institute of Nuclear Energy Safety Technology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, PR China;[Zhang, Shichang] University of Science and Technology of China, Hefei 230026, PR China;[Huang, Qunying] University of Science and Technology of China, Hefei 230026, PR China. Electronic address: qunying.huang@inest.cas.cn;[Wei, Yuezhou; Hamza, Mohammed F; Yin, Xiangbiao; Chen, Lifeng] School of Nuclear Science and Technology, University of South China, Hengyang 421001, PR China;[Wu, Kun; Zhong, Yilai; Hu, Fengtao] School of Resources, Environment and Materials, Guangxi University, Nanning 530004, PR China
通讯机构：
[Ning, Shunyan] S;[Huang, Qunying] U;University of Science and Technology of China, Hefei 230026, PR China. Electronic address: qunying.;School of Nuclear Science and Technology, University of South China, Hengyang 421001, PR China. Electronic address:
摘要：
Radioactive strontium ((90)Sr) is considered as one of the most dangerous radionuclides due to its high biochemical toxicity. For the efficient and selective separation of Sr from acidic environments, a novel functional adsorbent CEPA@SBA-15-APTES was prepared in this work through the phosphorylation of amino-modified mesoporous silica with organic content of approximately 20wt%. CEPA@SBA-15-APTES was characterized by TEM, SEM, EDS, TG-DSC, BET, FTIR, and XPS techniques, revealing its characteristics of an ordered hexagonal lattice-like structure and rich functional groups. The experimental results demonstrated that the adsorbent exhibited good adsorption capacity for Sr over a wide acidity range (i.e., from 10(-10) M to 4M HNO(3)). The adsorption equilibriums of Sr by CEPA@SBA-15-APTES in 10(-6) M and 3M HNO(3) solutions were reached within 30 and 5min, respectively, and the adsorption capacities at 318K were 112.6 and 71.8mg/g, respectively. Furthermore, by combining the experimental and characterization results, we found that the adsorption mechanism consisted of ion exchange between Sr(II) and H(+) (in P-OH) in the 10(-6) M HNO(3) solution and coordination between the Sr(II) and oxygen-containing (CO and P=O) functional groups in the 3M HNO(3) solution.
作者机构：
[Huiting Liang; Chengtao Yue; Guizhi Zhao] School of Nuclear Science and Technology, University of South China, Hengyang 421001, China;[Xing Yang] State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Science, Lanzhou 730000, China;Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China;[Junyan Zhang; Yongfu Wang] State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Science, Lanzhou 730000, China<&wdkj&>Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
通讯机构：
[Guizhi Zhao] S;School of Nuclear Science and Technology, University of South China, Hengyang 421001, China
摘要：
The wear of diamond in the drawing of ultra-fine metal wire leads to wire fracture and surface roughening, which inspires us to explore new pathways to solve problems. This study mimics the frictional behaviors of diamond and diamond-like carbon during the metal drawing process, and comparatively examines their frictional behaviors paired with Cu balls. When diamond-like carbon slide against the balls, the formation of a continuous and graphitized transfer film reduced friction and wear in the wide range of sliding velocities. Conversely, high friction and wear of diamond are primarily attributed to the presence of discontinuous and oxidized transfer films. The distinctive frictional behavior of diamond-like carbon contributes to effectively preventing problems such as wire breakage and uneven wire formation.
作者机构：
Key Laboratory of Advanced Nuclear Energy Design and Safety, Ministry of Education, University of South China, Hengyang 421001, China;School of Nuclear Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;[Cong Li; Qi Zheng] School of Nuclear Science and Technology, University of South China, Hengyang 421001, China;School of Resources Environment and Safety Engineering, University of South China, Hengyang 421001, China;Author to whom correspondence should be addressed.
通讯机构：
[Tianjiao Jiang] K;Key Laboratory of Advanced Nuclear Energy Design and Safety, Ministry of Education, University of South China, Hengyang 421001, China<&wdkj&>School of Nuclear Science and Technology, University of South China, Hengyang 421001, China<&wdkj&>Author to whom correspondence should be addressed.
关键词：
ruthenium;adsorption;high level liquid waste;nitrite–nitric acid system
摘要：
Ruthenium is required to separate from high-level liquid waste (HLLW) because Ru is a valuable resource and is negatively influential on the vitrification process of HLLW. However, the separation of Ru is very challenging due to its complicated complexation properties. In this study, the adsorption and desorption characteristics of ruthenium on a synthesized SiPyR-N3 (weak-base anion exchange resin with pyridine functional groups) composite were investigated in nitric acid and nitrite–nitric acid systems, respectively, and the adsorption mechanism was explored. The experimental results showed that SiPyR-N3 has a significantly better adsorption effect on Ru in the nitrite–nitric acid system than in the nitric acid system, with an increase in the adsorption capacity of approximately three times. The maximum adsorption capacity of Ru is 45.6 mg/g in the nitrite–nitric acid system. The SiPyR-N3 possesses good adsorption selectivity (SFRu/other metal ions is around 100) in 0.1 M NO2−–0.1 M HNO3 solution. The adsorption processes of Ru in the two different systems are fitted with the pseudo-second-order kinetic model and Langmuir model for uptake kinetics and adsorption isotherms, respectively. The results obtained from the FT-IR, XPS, and UV absorption spectrometry indicate that NO2− was involved in the adsorption process either as a complexing species with the metal ions or as free NO2− from the solution. A 0.1 M HNO3 + 1 M thiourea mixed solution shows effective desorption performance, and the desorption efficiency can reach 92% at 328 K.
摘要：
Theoretical investigations are conducted to examine the impact of toroidal rotation and ion collisional viscosity on low-frequency zonal flow (LFZF) in a tokamak plasma with the fluid model. The results indicate that while the frequency of LFZF remains unchanged during an isothermal process with gamma=1, its damping rate is influenced by both toroidal rotation and ion collisional viscosity. Specifically, as the ion collisional viscosity increases, so does the damping rate of LFZF; conversely, as the toroidal rotation As its Mach number rises, its damping rate decreases. For a non-isothermal process with gamma > 1 (such as gamma = 5/3), the damping rate and frequency of LFZF are influenced by both toroidal rotation and ion collisional viscosity. It has been demonstrated that when the toroidal rotation Mach number surpasses a certain threshold, the frequency transitions from zero to a finite value, while the damping rate decreases as the toroidal rotation Mach number increases for LFZF. Furthermore, it has been observed that the damping rate of LFZF increases while the frequency decreases with an increase in ion collisional viscosity. Moreover, when the ion collisional viscosity surpasses a certain threshold, the frequency of LFZF drops to zero.
作者机构：
[Wang, YB; Wang, Youbin; Li, Yongkun; Zhou, Jiashun; Zhou, Bingtao] Guangxi Univ, Sch Resources Environm & Mat, State Key Lab Featured Met Mat & Life Cycle Safety, Nanning 530004, Peoples R China.;[Wang, YB; Wang, Youbin; He, Kezhun] Guangxi Alnan Inst Aerosp Transit Aluminum Alloy &, Nanning 530031, Peoples R China.;[Wei, Yuezhou] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.
通讯机构：
[Wang, YB ] G;Guangxi Univ, Sch Resources Environm & Mat, State Key Lab Featured Met Mat & Life Cycle Safety, Nanning 530004, Peoples R China.;Guangxi Alnan Inst Aerosp Transit Aluminum Alloy &, Nanning 530031, Peoples R China.
摘要：
In order to enhance the corrosion resistance of 6061 Al, a simple and efficient electrodeposition method for one-step preparation of ZnAlCe layered double hydroxides (LDH) protective film was proposed. The microstructure and corrosion resistance of LDH film were characterized. The results indicated that the presence of Ce promoted the growth of LDH, resulting in denser, thicker ZnAlCe-LDH film, which effectively slowed down the corrosion rate of 6061Al. Particularly, the electrodeposition behavior was investigated in situ using electrochemical quartz crystal microbalance. The electrodeposition of LDH films was divided into rapid deposition of hydroxide and nucleation growth of LDH, and these two processes were described in detail. This work provided novel ideas for the preparation of LDH films on Al alloys.
作者机构：
[Jun Li] , 栖霞区元化路6-10号中国科学院紫金山天文台, Nanjing, 210000, CHINA;[Xiao-Jun 毕效军 Bi#&#&#Jun Li] 粒子天体中心, 中国科学院高能物理研究所, 北京918信箱粒子天体中心, Beijing, 100049, CHINA;[Lin-Qing Gao] , School of Nuclear Science and Technology, University of South China, Hengyang 421001, China, Hengyang, 421001, CHINA;[Xiaoyuan Huang] , Key Laboratory of Dark Matter and Space Astronomy, Purple Mountain Observatory, Chinese Academy of Sciences, 210033 Nanjing, Jiangsu, China, Nanjing, 210033, CHINA;[Run-Min Yao] , Key Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China, Beijing, 100049, CHINA
摘要：
High-energy photons may oscillate with axion-like particles (ALPs) when they propagate through the Milky Way's magnetic field, resulting in an alteration in the observed photon energy spectrum. The ultra-high energy gamma-ray spectra, measured by the Large High Altitude Air Shower Observatory (LHAASO) up to $\mathcal{O}(1)~\mathrm{PeV}$, provide a promising opportunity to investigate the ALP-photon oscillation effect. In this study, we utilize the gamma-ray spectra of four Galactic sources measured by LHAASO, including the Crab Nebula, LHAASO J2226+6057, LHAASO J1908+0621, and LHAASO J1825-1326, to explore this effect. We employ the $\rm CL_s$ method to set constraints on the ALP parameters. Combing the observations of the four sources, our analysis reveals that the ALP-photon coupling $g_{a\gamma}$ is constrained to be smaller than $1.4\times10^{-10}$ ${\rm GeV}^{-1}$ for the ALP mass of $\sim 4\times10^{-7} ~\mathrm{eV}$ at the 95\% C.L. By combing the observations of the Crab Nebula from LHAASO and other experiments, we find that the ALP-photon coupling could be set to be about $7.5\times10^{-11}$ ${\rm GeV}^{-1}$ for the ALP mass $\sim 4 \times10^{-7}~\mathrm{eV}$ , which is in close proximity to the CAST constraint.
作者机构：
[Xun Chen] School of Nuclear Science and Technology, University of South China, Hengyang 421001, China;[Mei Huang] School of Nuclear Science and Technology, University of Chinese Academy of Sciences, Beijing 100049, China
通讯机构：
[Mei Huang] S;School of Nuclear Science and Technology, University of Chinese Academy of Sciences, Beijing 100049, China
摘要：
Based on lattice QCD results of equation of state and baryon number susceptibility at zero baryon chemical potential, and supplemented by machine learning techniques, we construct the analytic form of the holographic black hole metric in the Einstein-Maxwell-Dilaton framework for pure gluon, 2-flavor, and ( 2+1 )-flavor systems, respectively. The dilaton potentials solved from Einstein equations are in good agreement with the extended nonconformal DeWolfe-Gubser-Rosen type dilaton potentials fixed by lattice QCD equation of state, which indicates the robustness of the Einstein-Maxwell-Dilaton framework. The predicted critical end point in the ( 2+1 )-flavor system is located at ( Tc=0.094 GeV , μBc=0.74 GeV ), which is close to the results from the realistic Polyakov-Nambu-Jona-Lasinio model, the functional renormalization group, and the holographic model with extended DeWolfe-Gubser-Rosen dilaton potential.
摘要：
The accurate monitors of the electron beams and g -ray fluxes are very important for laser -driven photonuclear studies. The flux -weighted average cross sections and average cross sections per equivalent quantum of 27Al(g, x; x = 2p, p, 3)24Na reactions were measured above the giant dipole resonance region through activation methods. Laser -driven ultra -intense bremsstrahlung grays, generated by laser wakefield accelerated quasi-monoenergetic electrons, were used in the experiment at the 200 TW laser facility of the Compact Laser Plasma Accelerator Laboratory, Peking University. The results demonstrated good agreement with previous works and were compared with theoretical values given by TALYS 1.9 calculations. The experimental cross sections were confirmed to be 2.4 times higher than TALYS 1.9 with default options. This work proved the feasibility of using the 27Al(g, x)24Na reactions as monitors for laser wakefield accelerated electrons and their bremsstrahlung g -ray fluxes.
期刊：
Journal of Hazardous Materials,2024年461:132664 ISSN：0304-3894
通讯作者：
Yin, XB;Wang, XP
作者机构：
[Fujita, Toyohisa; Wang, Xinpeng; Lin, Zheyang; Chen, Yuliang] Guangxi Univ, Sch Resources Environm & Mat, State Key Lab Featured Met Mat & Life Cycle Safety, 100 Daxue East Rd, Nanning 530004, Peoples R China.;[Yin, Xiangbiao; Ning, Shunyan; Zheng, Ningchao] Univ South China, Sch Nucl Sci & Technol, 28 Changsheng West Rd, Hengyang 421001, Peoples R China.;[Chen, Yanliang] East China Inst Technol, Minist Educ, Engn Res Ctr Nucl Technol Applicat, Nanchang 330013, Peoples R China.;[Wang, Xinpeng; Wang, XP] Guangxi Univ, Sch Resources Environm & Mat, 100 Daxue East Rd, Nanning 530004, Peoples R China.
通讯机构：
[Wang, XP ] G;[Yin, XB ] U;Univ South China, Sch Nucl Sci & Technol, 28 Changsheng West Rd, Hengyang 421001, Peoples R China.;Guangxi Univ, Sch Resources Environm & Mat, 100 Daxue East Rd, Nanning 530004, Peoples R China.
关键词：
Electro adsorption;NASICON;Seawater;Uranium
摘要：
As an eco-friendly technique with the superior adsorption performance, electroadsorption has shown great potential for application in uranium (U(VI)) recovery in recent years. However, the electrodes used in the electrosorption generally suffer the adsorbent to be loaded on the conductors, which greatly limited the adsorption performance of the electrodes for uranyl ions. In present study, a flexible self-supporting Na(3)MnTi(PO(4))(3)@C fibers (NMTP@C fibers) electrode material was rationally designed and prepared by electrostatic spinning method and annealing technique, and its ability to capture U(VI) efficiently was preliminarily demonstrated by batch adsorption and electro sorption. The plentiful phosphate groups provide sufficient active sites for adsorption, while the axially continuous electron conduction and radially short-range ion transport give NMTP@C fibers fast charge/ion transport capability. The NMTP@C fiber can remove 99% of 5ppmU(VI) in seawater by electro absorption within 1h. After several cycles of adsorption under seawater conditions, the adsorbent can still maintain a stable adsorption capacity. The adsorption mechanism of NMTP@C nanofibers for U(VI) was investigated by XPS, FT-IR, Raman, SEM-EDS, and XRD, which was electrostatic interactions and surface complexation. These results suggest that NMTP@C fibers are promising high-capacity adsorbents for efficient and selective capture of U(VI) from seawater.
作者机构：
[Fujita, Toyohisa; Wang, Xinpeng; Zeng, Deqian; Wang, Longfei; Zeng, DQ; Liu, Yimin; Yu, Qingguo] Guangxi Univ, State Key Lab Featured Met Mat & Life cycle Safety, Sch Resources Environm & Mat, Nanning 530004, Peoples R China.;[Zeng, Deqian; Wei, Yuezhou; Zeng, DQ] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.
通讯机构：
[Zeng, DQ ] G;Guangxi Univ, State Key Lab Featured Met Mat & Life cycle Safety, Sch Resources Environm & Mat, Nanning 530004, Peoples R China.;Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.
摘要：
Cobalt carbides are emerging as promising materials for various magnetic and catalytic applications. However, exploring dedicated cobalt carbides with optimal catalytic properties via adjusting phase compositions remains a significant challenge. Herein, three different cobalt carbides, Co(x)C (Co(2)C-Co(3)C), Co(2)C-Co, and Co(3)C, were successfully prepared using a facile one-pot green method. The phase compositions of cobalt carbides could be easily controlled by varying the cobalt-based precursors and carbon sources. More remarkably, three different cobalt carbides could serve as reduction cocatalysts decorated CdS for improved hydrogen production under visible light. Intriguingly, the obtained Co(3)C/CdS nanocomposite displayed the highest photocatalytic hydrogen evolution activity among the three composites and superior photocatalytic stability. This work provides a fundamental approach to tuning the photocatalytic properties of cobalt carbides for energy conversion fields.
期刊：
Micro and Nanostructures,2024年188:207792 ISSN：2773-0123
通讯作者：
Yanfang Xia
作者机构：
[Zheng Li; Hengjian Hou; Zeyi Lu; Kaiyang Gao; Guoqing Liu; Yiren Wu; Yangjie Luo] College of Nuclear Science and Technology, University of South China, Hengyang, 421001, China;Zhuhai Tsinghua University Research Institute Innovation Center, 101 University Ave, Tangjiawan, Zhuhai, 519000, China;[Yanfang Xia] College of Nuclear Science and Technology, University of South China, Hengyang, 421001, China<&wdkj&>Zhuhai Tsinghua University Research Institute Innovation Center, 101 University Ave, Tangjiawan, Zhuhai, 519000, China
通讯机构：
[Yanfang Xia] C;College of Nuclear Science and Technology, University of South China, Hengyang, 421001, China<&wdkj&>Zhuhai Tsinghua University Research Institute Innovation Center, 101 University Ave, Tangjiawan, Zhuhai, 519000, China
摘要：
In this paper, La2/3Ca1/3Fe1-xMnxO3-δ(x = 0–0.6) nano particles have been prepared by the sol-gel method. X-ray diffraction (XRD) analysis revealed that with the increase of Mn doping content, the main diffraction peak shifted to the right, the lattice parameters decreased overall, and the degree of lattice distortion gradually reduced. X-ray photoelectron spectroscopy (XPS) analysis indicates that the valence states of Fe and Mn in the system coexist as trivalent and tetravalent, and with the increase in Mn doping, the ratio of Fe3+/Fe4+ decreases, while the ratio of Mn3+/Mn4+ slightly increases. The results of Mössbauer spectrum analysis revealed that as the Mn doping content increased, some Fe ion valence states in the system gradually changed from Fe3+ to Fe4+, and the presence of the paramagnetic phase became increasingly prominent. Furthermore, with the increase of Mn doping content, the degree of lattice distortion in the system decreased, which is consistent with the results obtained from the XRD analysis. This work will provide a reference for future research on the effects of manganese doping in similar systems.
期刊：
Journal of Solid State Chemistry,2024年333:124645 ISSN：0022-4596
通讯作者：
Deqian Zeng
作者机构：
[Yimin Liu; Yufeng Gan; Toyohisa Fujita; Xinpeng Wang] School of Resources, Environment and Materials, Guangxi University, Nanning 530004, PR China;[Qingru Zeng; Shunyan Ning; Yuezhou Wei; Deqian Zeng] School of Nuclear Science and Technology, University of South China, Hengyang, 421001, PR China
通讯机构：
[Deqian Zeng] S;School of Nuclear Science and Technology, University of South China, Hengyang, 421001, PR China
摘要：
In this work, a novel 2D layered heterojunction for various photocatalytic reactions is constructed by hybridizing CdS nanosheets and CuInSe2 nanoplatelets. By adjusting CuInSe2 content, the CdS-16% CuInSe2 sample displays a visible-light-induced H2 production rate of 4382 μmol g−1 h−1, approximately 7.5 times higher than pristine CdS. Furthermore, CdS-16% CuInSe2 demonstrates exceptional photocatalytic activity in H2 evolution simultaneous benzyl alcohol (BA) oxidation and polyethylene terephthalate (PET) degradation. The superior photocatalytic activity is ascribed to the unique S-scheme heterojunction and 2D-2D CdS–CuInSe2 layered heterostructures that effectively separate photoinduced charge carriers and provide appropriate interfacial band structures. The photocatalytic mechanism is thoroughly examined through experiments and density functional theory calculations. This work offers a valuable platform to develop innovative layered photocatalysts that are highly effective for a wide range of photocatalytic reactions.
作者机构：
[Zhu, Jin; Liu, Yuchen; He, Lie; Xiao, Wancheng; Wang, Xiaodong; Peng, Xiaoyu] School of Nuclear Science and Technology, University of South China, Hengyang, China, Hengyang, Hunan, 421001, CHINA;[Luo, Siyuan] School of Nuclear Science and Technology, University of South China, Hengyang, Hengyang, Hunan, 421001, CHINA;[Zhu, Kun] School of Radiation Medicine and Protection, Soochow University, SuZhou, China, Suzhou, Jiangsu, 215006, CHINA
关键词：
DNA damage;Geant4-DNA;RBE;radiochemistry
摘要：
Uncertainties in the relative biological effectiveness (RBE) of proton remains a major barrier to the biological optimization of proton therapy. A large amount of experimental data suggest that proton RBE is variable. As an evolving Monte Carlo code toolkit, Geant4-DNA is able to simulate the initial DNA damage caused by particle beams through physical and chemical interactions at the nanometer scale over a short period of time. This contributes to evaluating the radiobiological effects induced by ionizing radiation. Based on the Geant4-DNA toolkit, this study constructed a DNA geometric model containing 6.32Gbp, simulated the relationship between radiochemical yields (G-values) and their corresponding chemical constructors, and calculated a detailed calculation of the sources of damage and the complexity of damage in DNA strand breaks. The damage model constructed in this study can simulate the relative biological effectiveness (RBE) in the proton Bragg peak region. The results indicate that: (1) When the electron energy is below 400 keV, the yield of OH· account for 18.1% to 25.3% of the total water radiolysis yields. (2) Under the influence of histone clearance function, the yield of indirect damage account for over 72.93% of the yield of DNA strand breaks (SBs). When linear energy transfer (LET) increased from 29.79 (keV/µm) to 64.29 (keV/µm), the yield of double strand breaks (DSB) increased from 17.27% to 32.65%. (3) By investigating the effect of proton Bragg peak depth on the yield of direct DSB (DSB_direct) and total DSB (DSB_total), the RBE and RBE levels of cells show that the RBE value of protons reaches 2.2 in the Bragg peak region.
期刊：
Journal of Radioanalytical and Nuclear Chemistry,2024年:1-12 ISSN：0236-5731
通讯作者：
Hai Wang
作者机构：
School of Nuclear Science and Technology, University of South China, Hengyang, China;R&D and Modelling Center for Treatment and Disposal of Radioactive Waste, University of South China, Hengyang, China;Beijing Research Institute of Chemical Engineering and Metallurgy, Beijing, China;Department of Chemical Engineering and Technology, Royal Institute of Technology, Stockholm, Sweden;[Wenjie Bian; Deng Tang; Hai Wang; Xu Zhang; Chengtao Yue; Shuo Meng] School of Nuclear Science and Technology, University of South China, Hengyang, China<&wdkj&>R&D and Modelling Center for Treatment and Disposal of Radioactive Waste, University of South China, Hengyang, China
通讯机构：
[Hai Wang] S;School of Nuclear Science and Technology, University of South China, Hengyang, China<&wdkj&>R&D and Modelling Center for Treatment and Disposal of Radioactive Waste, University of South China, Hengyang, China
关键词：
Muscovite;Diffusion;pH;Accessible porosity
摘要：
The migration behavior of Se(IV) and Re(VII) in muscovite was studied by capillary diffusion method and diffusion cell method. The results show that diffusion accelerates when the density decreases and the ionic strength increases. At the same time, pH also significantly affects their migration. The apparent diffusion coefficient ranges from 10–11 to 10–9 m/s2. This work can provide potential applications in deep geological nuclear waste repositories.
摘要：
Soil surface carbon dioxide (CO2) fluxes hold significant implications for comprehending carbon cycling, global climate change, and ecosystem functioning. Accurate understanding and quantification of this flux are crucial for assessing the carbon dynamics of ecosystems and predicting the impacts of climate change. In this study, we analyzed the variation pattern of CO2 concentration within the accumulated chamber from Fick's law, accounting for diffusion gradient effect and considering leakage effect. We developed a simple model to measure the soil surface CO2 flux, and used the model to calculate the values of CO2 fluxes on a specific soil surface. Comparing the fitting results of the proposed nonlinear model with traditional linear models for the measurement data, we found that the linear model underestimated by at least 18%, even up to 45%. Overall, our research indicates that the proposed model exhibits significant advancement and higher predictive reliability, successfully evaluating soil surface CO2 flux.
期刊：
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS,2024年2024(01):026 ISSN：1475-7516
作者机构：
[Lin-Qing Gao] School of Nuclear Science and Technology, University of South China, Hengyang 421001, China;[Peng-Fei Yin] Key Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China;School of Physical Sciences, University of Chinese Academy of Sciences, Beijing, China;Key Laboratory of Dark Matter and Space Astronomy, Purple Mountain Observatory, Chinese Academy of Sciences, 210033 Nanjing, Jiangsu, China;School of Astronomy and Space Science, University of Science and Technology of China, 230026 Hefei, Anhui, China
摘要：
The LHAASO collaboration recently reported the measurement of the gamma-ray spectra of GRB 221009A, which is the brightest burst ever, covering an energy range from 0.3 TeV to about 10 TeV. Based on the observation, we investigate the ALP-photon oscillation effect in the host galaxy of GRB 221009A and the Milky Way. The CLs method is applied to set constraints on the ALP parameters in this study. Given the uncertain magnetic field configuration in the host galaxy, we use three different models: a homogeneous magnetic field model, a magnetic field model identical to that of the Milky Way, and a model constructed from the HST observations of the host galaxy. We find that the constraints derived using these three host galaxy magnetic field models are comparable. Our results are complementary in the small ALP mass regions compared with other experiments.
作者机构：
[Fujita, Toyohisa; Dong, Haoran; Xu, Sizhi; Wang, Youbin; Gao, Feng; Li, Zengyuan; Hu, Fengtao] Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured Materials, MOE Key Laboratory of New Processing Technology for Non-ferrous Metals and Materials, School of Resources, Environment and Materials, Guangxi University, Nanning, 530004, China;[Ning, Shunyan] School of Nuclear Science and Technology, University of South China, 28 Changsheng West Road, Hengyang, 421001, China. Electronic address: ningshunyan@usc.edu.cn;[Chen, Lifeng] School of Nuclear Science and Technology, University of South China, 28 Changsheng West Road, Hengyang, 421001, China. Electronic address: lfchen@usc.edu.cn;[Wei, Yuezhou; Hamza, Mohammed F; Yin, Xiangbiao] School of Nuclear Science and Technology, University of South China, 28 Changsheng West Road, Hengyang, 421001, China;[Wei, Yuezhou] School of Nuclear Science and Engineering, Shanghai Jiao Tong University, 800 Dong Chuan Road, Shanghai, 200240, China
通讯机构：
[Shunyan Ning; Lifeng Chen] S;School of Nuclear Science and Technology, University of South China, 28 Changsheng West Road, Hengyang, 421001, China
摘要：
Efficient recognition, separation and recovery of palladium from high-level liquid waste (HLLW) not only helps the safe, green and environmentally friendly disposal of nuclear waste, but also is an essential important supplement to overcome the growing shortage of natural palladium resources. Herein, a novel silica-based functional adsorbent named 2AT-SiAaC was prepared by a two-step method, i.e., grafting of 2-aminothiazole (2AT) via the amidated reaction after in-situ polymerization of acrylic monomers on porous silica. SEM, EDS, TG-DSC, BET and PXRD all proved the successful preparation of 2AT-SiAaC, and it exhibited ultrahigh adsorption selectivity for Pd(II) (K(d) (distribution coefficient)≥10,344.2mL/g, SF(Pd/M) (separation factor)≥613.7), fast adsorption kinetics with short equilibrium time (t≤1h) and good adsorption capacity (Q≥62.1mgPd/g). The dynamic column experiments shows that 2AT-SiAaC achieved efficiently separation of Pd(II) from simulated HLLW, and the enrichment coefficients (C/C(0)) of Pd(II) was as high as about 14 with the recovery rate nearly 99.9% and basically kept the same performance in three adsorption-desorption column cycle experiments. The adsorption mechanism was analyzed by FT-IR, XPS and DFT calculations, and the ultrahigh selectivity of 2AT-SiAaC was attributed to the preferred affinity of the soft N-donor atoms in 2AT for Pd(II). NO(3)(-) ions participated in the adsorption reaction to keep charge balance, and the frontier orbital electron density distribution diagram shows the charge transfer in the process of material preparation and adsorption. To sum up, 2AT-SiAaC adsorbent provided a new insight for precise recognition and efficient separation of Pd(II) from HLLW.
期刊：
EUROPEAN PHYSICAL JOURNAL C,2024年84(1):1-7 ISSN：1434-6044
通讯作者：
Chen, X
作者机构：
[Zhou, Jing] Hunan City Univ, Dept Phys, Yiyang 413000, Hunan, Peoples R China.;[Zhou, Jing] Hunan City Univ, All solid state Energy Storage Mat & Devices Key L, Yiyang 413000, Peoples R China.;[Zhou, Jing; Ping, Jialun] Nanjing Normal Univ, Dept Phys, Nanjing 210097, Jiangsu, Peoples R China.;[Chen, Jun] Hubei Minzu Univ, Dept Phys, Enshi 445000, Peoples R China.;[Zhang, Le] Hubei Normal Univ, Coll Phys & Elect Sci, Huangshi 435002, Peoples R China.
通讯机构：
[Chen, X ] U;Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.
摘要：
According to gauge/gravity correspondence, we study the holographic Schwinger effect within an anisotropic background. Firstly, the separate length of the particle-antiparticle pairs is computed within the context of an anisotropic background which is parameterized by dynamical exponent nu\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\nu $$\end{document}. It is found that the maximum separate length x increases with the increase of dynamical exponent nu\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\nu $$\end{document}. By analyzing the potential energy, we find that the potential barrier increases with the dynamical exponent nu\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\nu $$\end{document} at a small separate distance. This observation implies that the Schwinger effect within an anisotropic background is comparatively weaker when contrasted with its manifestation in an isotropic background. Finally, we also find that the Schwinger effect in the transverse direction is weakened compared to the parallel direction in the anisotropic background, which is consistent with the top-down model.
