摘要：
To address the imperative need for efficient removal of uranium-containing wastewater and mitigate radioactive contamination risks associated with nuclear energy, the development of materials with high removal efficiency and facile separation is crucial. This study designed and synthesised MnO(2)@chitosan (CTS) composite aerogel beads by in-situ growing δ-MnO(2) on porous CTS aerogel beads. This approach not only mitigates the agglomeration of MnO(2) nanospheres but also significantly enhances the porous structure and surface area of MnO(2)@CTS. These cost-effective and eco-friendly millimeter-scale spherical aerogels exhibited convenient separation properties after adsorption. These characteristics help mitigate the risk of equipment seam blockage and secondary pollution that are often associated with powdered adsorbents. Additionally, MnO(2)@CTS exhibited remarkable mechanical strength (stress approximately 0.55MPa at 60% strain), enabling rapid separation and easy regeneration while maintaining high adsorption performance even after five cycles. Significantly, MnO(2)@CTS exhibited a maximum adsorption capacity of 410.7mg/g at pH 6 and 298K, surpassing reported values for most CTS/MnO(2)-based adsorbents. The chemisorption process of U(VI) on MnO(2)@CTS followed the pseudo-second-order kinetic and Dubinin-Radushkevish models. X-ray photoelectron spectroscopy analysis further confirmed the reduction of U(VI) to U(V/IV). These findings highlight the substantial potential of MnO(2)@CTS aerogel beads for U(VI) removal from aqueous solutions, positioning them as a promising solution for addressing U(VI) contamination in wastewater.
期刊：
EUROPEAN PHYSICAL JOURNAL C,2023年83(9):1-9 ISSN：1434-6044
通讯作者：
Chu, PC
作者机构：
[Chu, PC; Liu, He; Chu, Peng-Cheng] Qingdao Univ Technol, Res Ctr Theoret Phys, Sci Sch, Qingdao 266033, Peoples R China.;[Cao, Qian] Qingdao Univ Technol, Sch Informat & Control Engn, Qingdao 266033, Peoples R China.;[Li, Xiao-Hua] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.;[Li, Xiao-Hua] Univ South China, Cooperat Innovat Ctr Nucl Fuel Cycle Technol & Equ, Hengyang 421001, Peoples R China.;[Ju, Min] China Univ Petr East China, Coll Sci, Qingdao 266580, Peoples R China.
通讯机构：
[Chu, PC ] Q;Qingdao Univ Technol, Res Ctr Theoret Phys, Sci Sch, Qingdao 266033, Peoples R China.
摘要：
We investigate the thermodynamical properties of color-flavor locked (CFL) quark matter at zero temperature, finite temperature, and strong magnetic field by using quasiparticle model. We find that considering CFL quark phase can significantly change the equation of state (EOS) as well as the properties of quark matter in quark stars (QSs) at finite temperature or under magnetic field within quasiparticle model. In particular, our results have shown that we can provide the large QSs within CFL quark phase from quasiparticle model by satisfying both the upper limit of
$$\Lambda _{1.4}<800$$
for the low-spin priors of 1.4 solar mass pulsars from GW170817 and the new estimates of the mass-radius region from PSR J0740 + 6620, PSR J0030 + 0451, HESS J1731-347, and 4U 1702-429, which cannot be obtained by considering the QSs with SQM within quasiparticle model.
作者机构：
[Wei, Yuezhou; Hamza, Mohammed F.] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.;[Hamza, Mohammed F.] Nucl Mat Author, POB 530, Cairo, Egypt.;[Guibal, Eric] IMT Mines Ales, Polymers Compos & Hybrids PCH, Ales, France.;[Wei, Yuezhou] Shanghai Jiao Tong Univ, Sch Nucl Sci & Engn, Shanghai, Peoples R China.;[Fouda, Amr] Al Azhar Univ, Fac Sci, Bot & Microbiol Dept, Cairo 11884, Egypt.
通讯机构：
[Guibal, E.] P;[Wei, Y.] S;Polymers Composites and Hybrids (PCH), France;School of Nuclear Science and Technology, China
关键词：
An efficient magnetic composite sorbent was synthesized by incorporation of magnetite nanoparticles into polymer matrix (obtained by formaldehyde polycondensation of guanidine and amino hydroxynaphthalene sulfonic acid);Temkin equations fitted sorption isotherms while uptake kinetics are successfully modeled with the pseudo-first order rate equation;The sensitivity of uranyl ions to reduction explains the complementary metal sorption and enhanced selectivity under UV irradiation for both synthetic and complex industrial solutions;UV exposure improves the stability of sorption properties at recycling (uranium being fully desorbed using nitric acid solution);UV irradiation allows to both increase uranium sorption capacity and enhance uptake kinetics
摘要：
MgxNi1-xFe2O4 (x = 0, 0.25, 0.5, 0.75, 1) spinel ferrite material was analyzed to determine its magnetic properties and structure. X-ray diffraction (XRD), Mossbauer spectroscopy, and vibrating sample magnetometer (VSM) characterization were performed on the samples prepared using the sol-gel method. The results from XRD confirmed the existence of the single-phase cubic spinel structures Fd (3) over barm, as well as the evolution of the crystalline size (D), the lattice parameter (a) and cell volume in compounds. The Mossbauer spectra showed the distribution of cations and changes in the magnetic properties of the sample. VSM measurement revealed that the samples were room-temperature ferromagnetic. Moreover, the saturation magnetization (M-s) of the samples changed with the Mg2+ ion content x, and a maximum occured at x = 0.5. Doping with Mg2+ ions increased the transfer of Ni2+ ions to tetrahedral sites, thus increasing the magnetic moment difference between tetrahedral (A) and octahedral (B) sites. Specifically, doping NiFe2O4 with Mg2+ ions can enhance its magnetic properties and enhance its saturation magnetization.
通讯机构：
[Ya-Nan Zhao; Tao Yu] S;School of Nuclear Science and Technology, University of South China, Hengyang, Hunan, 421001, China<&wdkj&>Research Center for Digital Nuclear Reactor Engineering and Technology of Hunan Province, University of South China, Hengyang, Hunan, 421001, China
摘要：
The multi-physics coupled methodologies that have been widely used to analyze the complex process occurring in nuclear reactors have also been used to the R&D of numerical reactors. The advancement in the field of computer technology has helped in the development of these methodologies. Herein, we report the integration of ADPRES code and RELAP5 code into the SALOME-ICoCo framework to form a multi-physics coupling platform. The platform exploits the supervisor architecture, serial mode, mesh one-to-one correspondence and explicit coupling methods during analysis, and the uncertainty analysis tool URANIE was used. The correctness of the platform was verified through the NEACRP-L-335 benchmark. The results obtained were in accordance with the reference values. The platform could be used to accurately determine the power peak. In addition, design margins could be gained post uncer-tainty analysis. The initial power, inlet coolant temperature and the mass flow of assembly property significantly influence reactor safety during the rod ejections accident (REA).(c) 2023 Korean Nuclear Society, Published by Elsevier Korea LLC. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
期刊：
Surface and Coatings Technology,2023年459:129411 ISSN：0257-8972
通讯作者：
Youbin Wang
作者机构：
[Feng, Jiqiang; Wang, Youbin; Lin, Xueliang] Guangxi Univ, Sch Resources Environm & Mat, State Key Lab Featured Met Mat & Life Cycle Safety, Nanning 530004, Peoples R China.;[Feng, Jiqiang; Wang, Youbin; Lin, Xueliang] Guangxi Univ, Educ Dept Guangxi Zhuang Autonomous Reg, Key Lab High Performance Struct Mat & Thermo Surfa, Nanning 530004, Peoples R China.;[Bian, Meihua] Elect Power Res Inst Guangxi Power Grid Co Ltd, Nanning 530004, Peoples R China.;[Wei, Yuezhou] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.;[Wang, Youbin] Guangxi Univ, State Key Lab Featured Met Mat & Life cycle Safety, Nanning 530004, Peoples R China.
通讯机构：
[Youbin Wang] S;State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures, School of Resources, Environment and Materials, Guangxi University, Nanning 530004, PR China<&wdkj&>Key Laboratory of High Performance Structural Materials and Thermo-surface Processing (Guangxi University), Education Department of Guangxi Zhuang Autonomous Region, Nanning 530004, PR China
摘要：
The trivalent chromium conversion coating (CCC) is prepared on pure zinc, and the corrosion resistance of trivalent CCC is characterized by scanning electron microscopy (SEM), polarization curves and electrochemical impedance spectroscopy (EIS). The local corrosion and self-healing behavior of trivalent CCC at the initial stage of immersion corrosion are investigated in situ by scanning electrochemical microscopy (SECM). The results show that trivalent CCC has higher impedance value and lower corrosion current density as compared to pure zinc, and the coating has excellent corrosion protection for pure zinc. At the initial stage of corrosion (0-12h), the SECM feedback current of the trivalent CCC does not change significantly; after immersed for 24 h, the local current rises from 0.83 to 0.95, which can be explained that the trivalent CCC cracks locally and occurs local corrosion. In situ analysis of oxygen concentration at the scratch of trivalent CCC indicates that the addition of polyaniline can inhibit the oxygen reduction reaction, which hinders the corrosion process and improves the self-healing ability of trivalent CCC.
通讯机构：
[Wen Luo; Weimin Zhou] S;School of Nuclear Science and Technology, University of South China, 421001 Hengyang, People's Republic of China<&wdkj&>Science and Technology on Plasma Physics Laboratory, Laser Fusion Research Center, China Academy of Engineering Physics, 621900 Mianyang, People's Republic of China
关键词：
laser plasma;high-energy electron beam;photonuclear reaction;medical isotopes
摘要：
Radioisotopes are indispensable agents in medical diagnosis and treatment, among which copper-62, 64 (Cu-62,Cu-64) and gallium-68 (Ga-68) are medical isotopes widely used in positron emission tomography (PET) imaging. Experiments that generate these radioisotopes via laser-induced photonuclear reactions were performed on the XingGuangIII laser facility of the Laser Fusion Research Center in Mianyang. High-charge (Q(e) similar to 40 nC) MeV electron (e(-)) beams were generated with 100 terawatts, picosecond laser pulses. The e(-) beams were then impinged on a metal stack composed of Ta foil and activation plates (natural Cu and Ga2O3), producing high-energy bremsstrahlung x-rays and medical isotopes Cu-62,Cu-64 and Ga-68, respectively. The characteristic emissions of the produced Cu-62,Cu-64 and Ga-68 were detected off-line , and the production yields of Cu-62,Cu-64 and Ga-68 were obtained to be of the order of 10(6) per laser shot. For electrons with energy higher than 8 MeV, the dependence of isotope production efficiency (per e(-)) on electron temperature (T-e) is investigated through Geant4 simulations. It is found that the production efficiency increases with the T-e. At T-e similar to 10 MeV, the values are 10(-4) for Cu-62 and 2 x 10(-5) for Ga-68, respectively. The prospect of producing the medical isotopes Cu-62,Cu-64 and Ga-68 are further evaluated using a table-top femtosecond laser system of high repetition. With a repetition rate of 100 Hz, their activity is expected to reach 0.2 GBq for Cu-62, 0.1 GBq for Cu-64 and 0.05 GBq for Ga-68, respectively. Such activity would meet the required dose for clinical PET imaging, indicating the great potential to produce medical isotopes with an all-optical, high-repetition laser system.
作者机构：
[Luo, Haoyang; Zhu, Zhichao; Li, Xinxiang; Cao, Zongwei; Luo, Wen; Li, Xiankai] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.;[Zhou, Tao; He, Pengqin; An, Zhendong; An, ZD; Liu, Shaokun; Yang, Gaole; Li, Xiankai; Wang, Jing; Tang, Renguang; Bai, Ruoran] Sun Yat sen Univ, Sch Phys & Astron, Zhuhai 519082, Peoples R China.;[An, Zhendong; Li, Xinxiang; An, ZD] Chinese Acad Sci, Shanghai Inst Appl Phys, Shanghai 201800, Peoples R China.;[Qiu, Weiwei; Zhang, Xiaoping; An, Zhendong; An, ZD; Liao, Zhengfa; Zhuang, Ziyue] Macau Univ Sci & Technol, State Key Lab Lunar & Planetary Sci, Macau 999078, Peoples R China.;[Qiu, Weiwei; Zhang, Xiaoping; An, Zhendong; An, ZD; Liao, Zhengfa; Zhuang, Ziyue] CNSA Macau Ctr Space Explorat & Sci, Macau 999078, Peoples R China.
通讯机构：
[An, ZD ] S;Sun Yat sen Univ, Sch Phys & Astron, Zhuhai 519082, Peoples R China.;Chinese Acad Sci, Shanghai Inst Appl Phys, Shanghai 201800, Peoples R China.;Macau Univ Sci & Technol, State Key Lab Lunar & Planetary Sci, Macau 999078, Peoples R China.;CNSA Macau Ctr Space Explorat & Sci, Macau 999078, Peoples R China.
摘要：
In nuclear astrophysics, 141Pr is mainly produced by an s process, which has a neutron magic number (N = 82) leading to its low capture cross section and strongly affecting the s process. Its neutron capture cross section is an important input parameter for nuclear astrophysical network calculations. According to the EXFOR database, the measurement precision for the 141Pr(n, gamma) cross section should be improved in the resolved and unresolved reso-nance region. The (n, gamma) cross section of 141Pr was measured between 1 eV and 500 keV at the Back-n facility of the Chinese Spallation Neutron Source using the time-of-flight (TOF) method. The prompt gamma rays were detected by four C6D6 liquid scintillator detectors, and the data was analyzed using the pulse-height weighting technique (PHWT). The majority of results are in agreement with the evaluated data libraries ENDF/B-VIII.0, JENDL-5.0, and TENDL-2021, with some significant exceptions for small resonances. The multilevel R-matrix Bayesian code SAMMY was used to extract the resonance parameters of 141Pr in the resolved resonance region. And the Maxwell average cross section (MACS) from kT = 5 to 100 keV is calculated in the temperature range of the s-process nucleosynthesis model. In particular, at kT = 30 keV the MACS value of 141Pr is 145.0 +/- 13.7 mb, which shows an obvious discrepancy with the Karlsruhe Astrophysical Database of Nucleosynthesis in Stars (KADoNiS) recommended value 111.4 +/- 1.4 mb.
通讯机构：
[Yang, XH ; Yu, T ; Yang, XH] U;Univ South China, Sch Nucl Sci & Technol, Hengyang, Hunan, Peoples R China.;Univ South China, Sch Comp Software, Hengyang, Hunan, Peoples R China.
摘要：
With the rapid development of computer technology, artificial intelligence and big data technology have undergone a qualitative leap, permeating into various industries. In order to fully harness the role of artificial intelligence in the field of nuclear engineering, we propose to use the LSTM algorithm in deep learning to model the BEAVRS (Benchmark for Evaluation And Validation of Reactor Simulations) core first cycle loading. The BEAVRS core is simulated by DRAGON and DONJON, the training set and the test set are arranged in a sequential fashion according to the evolution of time, and the LSTM model is constructed by changing a number of hyperparameters. In addition to this, the training set and the test set are retained in a chronological order that is different from one another throughout the whole process. Additionally, there is a significant pattern that is followed when subsetting both the training set and the test set. This pattern applies to both sets. The steps in this design are very carefully arranged. The findings of the experiments suggest that the model can be altered by making use of the appropriate hyperparameters in such a way as to bring the maximum error of the effective multiplication factor keff prediction of the core within 2.5pcm (10(-5)), and the average error within 0.5266pcm, which validated the successful application of machine learning to transport equations.
作者机构：
[Zhongkai Fan] school of Nuclear Science and Technology, University of South China, Hengyang, CHINA;[Ruomei Xie; Tao Hu] Hengyang Normal University, Hengyang, Hunan, CHINA;[Xiangming Cai] University of South China, Hengyang, 421001, CHINA;[Yizhe Luo; Fengdi Qin; Shoukang Qiu; Jian Shan] University of South China, Hengyang, Hunan, CHINA;[Yanliang Tan] Physics and Electronic Engineering, Hengyang Normal University, Hengyang, Hunan, CHINA
摘要：
ABSTRACT: Accurately measuring Rn-220 is crucial for evaluating natural radiation exposure. For the large volume of normal scintillation cell, the detection efficiencies for different energy of α particles decayed from Rn-222, Rn-220 and their progeny are varied. To address this, two systems of the low-pressure scintillation cell were designed to make the shortest range of α particles with minimum energy decayed from Rn-222 longer than the longest distance between any two points in the scintillation cell by reducing air pressure. Thus, the detection efficiencies of the low-pressure scintillation cell for α particles decayed from Rn-222, Rn-220 and their progeny are same. The detection efficiency of low-pressure scintillation cell for α particles can be obtained by the standard radon chamber, and then the calibration factor of Rn-220 can be determined by low-pressure scintillation. Several verification experiments were performed. The experimental results show that the detection efficiencies of Rn-222 and Rn-220 at the air pressure of 0.4P are very close and become saturated for lower values of air pressure. The calibration factor of Rn-220 calculated using the detection efficiency (0.76 ± 0.04) at the air pressure of 0.4P is 53.75 ± 2.96 Bq m-3 min-1 (k=1).
作者机构：
[Deng, Nianbiao] Univ South China, Sch Resource Environm & Safety Engn, Hengyang 421001, Peoples R China.;[Xie, Chao; Xie, Jinsen; Yu, Tao] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.;[Hou, Cheng] China Inst Atom Energy, Beijing 102413, Peoples R China.;[Li, Zhulun] North China Elect Power Univ, Sch Nucl Sci & Engn, Beijing 102206, Peoples R China.
通讯机构：
[Jinsen Xie; Tao Yu] S;School of Nuclear Science and Technology, University of South China, Hengyang 421000, China
关键词：
ADS Subcritical Reactor;deep subcriticality;heterogeneity of neutron fluence rate in time–space;Monte Carlo homogenization method;neutron kinetics
摘要：
A process for treating low radioactive uranium wastewater by ultrasonic combined flocculation and precipitation has been developed and optimized. By using arsenazo III spectrophotometry to detect the mass concentration of uranium ions, the optimal coupling mode of ultrasonic flocculation and the optimal values of pH value, flocculant dosage, and ultrasonic power were obtained through single factor experiments. The conclusion drawn is that the optimal coupling method is to first add flocculants, then treat the solution with ultrasound, and finally stir the solution. The optimal values for each single factor are: the initial pH value of the solution is 9, the dosage of flocculant is 80 mg/L, and the sound energy density is 0.36 W/ml.The Box Behnken response surface experiment was designed using Design-Expert software. After completing the response surface experiment, a regression model for uranium ion removal rate was obtained. The highest uranium ion removal rate under theoretical conditions was obtained by solving the model.The predicted values of uranium ions removal rate of 95.68% was obtained with an acoustic energy density of 0.436 W/ml and a flocculant dosage of 88 mg/L at pH 9.It was observed that the actual experimental data under the same conditions are 95.41% The order of the influence factors of each process parameter on the uranium ion removal rate is: pH > flocculant dosage > ultrasonic power. Among them, there was a significant interaction between ultrasonic power and flocculant dosage.
期刊：
International Journal of Quantum Chemistry,2023年123(8):e27072- ISSN：0020-7608
通讯作者：
Xijun Wu<&wdkj&>Xijun Wu Xijun Wu Xijun Wu
作者机构：
[Wu, Feihong; Zhang, Yang; Zhou, Nan; Yu, Wantang] Univ South China, Sch Nucl Sci & Technol, Hengyang, Peoples R China.;[Wu, Xijun; Cheng, Jinjuan; Qin, Yong; Tan, Jie] Univ South China, Sch Math & Phys, Hengyang, Peoples R China.;[Wu, Xijun] Univ South China, Sch Math & Phys, Hengyang 421001, Peoples R China.
通讯机构：
[Xijun Wu; Xijun Wu Xijun Wu Xijun Wu] S;School of Mathematics and Physics, University of South China, Hengyang, China
关键词：
adsorption;BC3;C3N;Cs;graphene
摘要：
Density functional theory (DFT) was used to conduct a systematic analysis of the adsorption characteristics of Cs on three two-dimensional materials: graphene, C3N, and BC3. The adsorption energies of Cs were calculated, and the electronic structure of the system was analyzed. The dependence of adsorption energies on temperatures was taken into account, and the first-principles-derived adsorption energies were used to calculate the influence of temperature on the adsorption rate. It was discovered that BC3 is more stable than the other two materials, has good adsorption characteristics, and has performance that is not significantly degraded at high temperatures. The adsorption performances of other radionuclides I and Ag (which also have radionuclides) on BC3, were also calculated to compare with that of Cs. The results show that the adsorption capacity of Cs on BC3 is much greater than that of the two lighter elements. Based on this study, BC3 is a good candidate for removing Cs from nuclear wastewater.
摘要：
Irradiation damage is one of the main drawbacks restricting the application of Silicon Photomultiplier (SiPM), especially in high irradiance environments such as space, colliders, and nuclear power plants. In-situ current annealing is a method of using the self-current heating of SiPM, and because it does not require disassembly of the SiPM and additional heating devices, it exhibits potential for dealing with radiation damage. We investigate the in-situ annealing performance of three types of SiPM for irradiation damage. The annealing current and time are optimized and the SiPM performance before and after annealing is compared. It was found that after annealing the dark currents of the three types of SiPMs decreased significantly by 1–2 orders of magnitude. Finally, the variation of SiPM performance with temperature is investigated. The energy resolution does not recover as well as the dark current.
