期刊：
WATER AIR AND SOIL POLLUTION,2025年236(1):1-12 ISSN：0049-6979
通讯作者：
Xue, JH
作者机构：
[Wang, Xinqing; Huang, Boshi; Xue, Jinhua; Xiao, Xilin] Univ South China, Sch Publ Hlth, Hengyang Med Sch, Hengyang, Hunan, Peoples R China.;[Lin, Dongying] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Hunan, Peoples R China.;[Liu, Jingjing; Ren, Lanxing] Univ South China, Sch Chem & Chem Engn, Hengyang 421001, Peoples R China.;[Xiao, Xilin] Hunan Univ, State Key Lab Chemo Biosensing & Chemometr, Changsha, Hunan, Peoples R China.
通讯机构：
[Xue, JH ] U;Univ South China, Sch Publ Hlth, Hengyang Med Sch, Hengyang, Hunan, Peoples R China.
关键词：
Cadmium (II);FR;PAN;Fluorescence quenching
摘要：
The objective of this study was to establish a novel method of fluorescence for the determination of cadmium using fluorescein (FR) and 1-(2-Pyridinylazo)-2-Naohthalenol (PAN). In the pH 9.75 buffer solution of the ammonia-ammonium chloride, the energy transfer between FR and the PAN can occur, which can result in the quenching of the fluorescence. The addition of Cd (II) to this system enhances the degree of quenching. This phenomenon has led to the establishment of a novel method for the determination of cadmium, which has been optimized in terms of the required experimental conditions. In the optimal experimental conditions, the fluorescence intensity of the system decreased linearly in the range of 7.81 x 10-7 to 2.14 x 10-5 mol L-1. The linear regression equation used in this study was F = 123.63 + 170.65c (x 10-6 mol L-1) under the correlation coefficient of 0.9951, the detection limit of 2.34 x 10-7 mol L-1, and the relative standard deviation of 0.18%. The proposed method was simple, sensitive, fast, and economical. The method can be employed for the determination of cadmium in real samples (tap-water, pond water and Xiangjiang River) with the results demonstrating consistency with the graphite furnace atomic absorption method (t-test). This approach offers an innovative method for the quantification of Cd (II).
作者：
Ye Wang;Huiwei Wei;Jing Wen;Jiayuan He;Pengcheng Li*
期刊：
Annals of Nuclear Energy,2025年211:110896 ISSN：0306-4549
通讯作者：
Pengcheng Li
作者机构：
[Ye Wang; Jiayuan He] School of Nuclear Science and Technology, University of South China, Hengyang, Hunan 421001, China;[Huiwei Wei] School of Economics, Management and Law, University of South China, Hengyang, Hunan 421001, China;[Jing Wen] School of Resources Environment and Safety Engineering, University of South China, Hengyang, Hunan 421001, China;[Pengcheng Li] Human Factor Institute, University of South China, Hengyang, Hunan 421001, China
通讯机构：
[Pengcheng Li] H;Human Factor Institute, University of South China, Hengyang, Hunan 421001, China
摘要：
In-situ leaching (ISL) causes non-negligible groundwater pollution. It is urgent to remediate the groundwater after ISL activities. In this study, we evaluated the effectiveness of flow electrode capacitive deionization (FCDI) to treat a simulated groundwater, the uranium (U) and SO42- concentration of which are comparable to groundwater in acid in-situ leaching (AISL) uranium mine for the first time. Moreover, the removal mechanism of U and SO42- were investigated in-depth. It is found that the operational mode, applied voltage and initial SO4 2concentration significantly affect the removal of U and SO42- by FCDI. The removal efficiency of U and SO42- were above 98 % at 75 min under optimal condition, although U in groundwater mainly existed in the form of uncharged UO2(SO4), followed by UO22+ and UO2(SO4)22- . UO22+ and UO2(SO4)2 2- in groundwater migrated into the two poles and were quickly absorbed by flow electrode, which promoted the dissociation of UO2(SO4) or complexation of UO2(SO4) with SO42- . In addition, the anion exchange membrane can absorb UO2(SO4) through complexation. These resulted in the efficient removal of U(VI). FCDI can reduce the U and SO42- concentration of the contaminated water (CU = 10 mg L- 1, CSO42- = 5 g L- 1) to a value lower than the Chinese emission limit (U: 300 mu g L- 1; SO42- : 250 mg L- 1) even after 18 cycles with each cycle operated for 120 min, which informed that FCDI system using activated carbon is of great potential for acidic contaminated water treatment.
摘要：
A series of compositionally complex A2Zr2O7 nanocrystalline ceramics were successfully prepared using sol-gel and co-precipitation methods. The resultant ceramics possess a cubic defect fluorite structure, with the sol-gel method yielding an average grain size of approximately 50-70 nm, while the co-precipitation method result in an average grain size of about 40-60 nm. Leaching tests revealed that the smaller grain sizes are correlated with higher leaching rates. Furthermore, for ceramics with similar grain sizes, those with higher entropy values exhibited higher leaching rates. The increase in grain boundaries was found to reduce the leaching performance of the rare earth zirconate ceramics, and this effect became more pronounced with increasing entropy. This work provides insights into the selection of entropy values and grain sizes for the high-level radioactive waste matrices, which can be considered as a potential substrate for the simultaneous immobilization of multiple radionuclides.
作者机构：
[Fang Wang; Zhuo Chen; Yue Wu; Yating Peng] School of Chemistry and Chemical Engineering, University of South China, Hengyang, Hunan 421001, China;[Tingting Li; Liangshu Xia] School of Nuclear Science and Technology, University of South China, Hengyang, Hunan 421001, China
通讯机构：
[Fang Wang; Tingting Li; Liangshu Xia] S;School of Chemistry and Chemical Engineering, University of South China, Hengyang, Hunan 421001, China<&wdkj&>School of Nuclear Science and Technology, University of South China, Hengyang, Hunan 421001, China
通讯机构：
[He, HY; Wang, XL ] U;[He, HY ] Y;Univ South China, Sch Nucl Sci & Technol, Hengyang, Hunan, Peoples R China.;Univ South China, Coll Mech Engn, Hunan Prov Key Lab Ultrafast Micro Nano Technol &, Hengyang, Hunan, Peoples R China.;Yangtze Univ, Sch Elect Informat & Elect Engn, Jingzhou, Peoples R China.
摘要：
Four-layer hexagonal silicon carbide (4H-SiC) is a promising material for high-temperature and radiation-rich environments due to its excellent thermal conductivity and radiation resistance. However, real 4H-SiC crystals often contain Shockley-type stacking faults (SSF), which can affect their radiation resistance. This study employed molecular dynamics (MD) simulation method to explore the effects of SSF on radiation displacement cascades in 4H-SiC. We conducted a comprehensive study of various SSF within the crystalline framework of 4H-SiC, and analyzed their stacking fault energy (SFE). We simulated the radiation displacement cascade in 4H-SiC with SSF and analyzed the effects of SSF on the distribution of radiation displacement defects. We simulated the radiation displacement cascade in 4H-SiC with SSF under different energies of primary knock-on atom (EPKA) and temperatures (T) conditions, and analyzed the variation pattern of the number of radiation displacement defects and clusters. The results indicated that SSF limits defect distribution position. SSF has an effect on the defects and clusters of 4H-SiC in the displacement cascade, and SSF can affect the maximum working temperature of 4H-SiC. Four-layer hexagonal silicon carbide (4H-SiC) is a promising material for high-temperature and radiation-rich environments due to its excellent thermal conductivity and radiation resistance. Shockley-type stacking faults serve as one of the factors influencing the radiation resistance of 4H-SiC.
作者机构：
[Zhao, YJ; Zhang, Zhen-Hua; Zhao, Yu-Jie] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Hunan, Peoples R China.;[Guo, Xin-Heng] Beijing Normal Univ, Coll Nucl Sci & Technol, Beijing 100875, Peoples R China.
通讯机构：
[Zhao, YJ ] U;Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Hunan, Peoples R China.
摘要：
CP violation in baryon decay processes is still undiscovered to date. We present a general analysis of the decay-angular distributions and the corresponding CP asymmetries in cascade decays of the type H-* R (-* ab)c, ) c, where H is a heavy hadron that decays through weak interactions H-* Rc and the resonance R decays strongly via R-* ab. Based on the analysis, we propose to search for CP violation in the decay-angular distributions in the cascade decay processes-* B M, with B or M subsequently decaying through strong interactions, where is the mother baryon, B and M are the daughter baryon and meson, respectively, and M has to be spin nonzero. We also present some typical decay channels in which the search for such kinds of CP asymmetries can be performed.
期刊：
Nuclear Science and Techniques .,2024年35(11):3-14 ISSN：1001-8042
通讯作者：
Wang, XD
作者机构：
[He, Lie; Xiao, Wan-Cheng; Zhang, Hai-Feng; Zou, Yu-Cheng; Wang, Xiao-Dong; Luo, Si-Yuan] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.;[He, Lie; Xiao, Wan-Cheng; Zhang, Hai-Feng; Zou, Yu-Cheng; Wang, Xiao-Dong; Luo, Si-Yuan] Univ South China, Key Lab Adv Nucl Energy Design & Safety MOE, Hengyang 421001, Peoples R China.;[Liu, Xiang-Man] Chinese Acad Sci, Inst Modern Phys, Lanzhou 730000, Peoples R China.;[Liu, Xiang-Man] Univ Chinese Acad Sci, Sch Nucl Sci & Technol, Beijing 100049, Peoples R China.;[Liu, Xiang-Man] Lanzhou Univ, Sch Nucl Sci & Technol, Lanzhou 730000, Peoples R China.
通讯机构：
[Wang, XD ] U;Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.;Univ South China, Key Lab Adv Nucl Energy Design & Safety MOE, Hengyang 421001, Peoples R China.
关键词：
Monte Carlo simulation;Muon tomography;TDOA;Machine learning;Image reconstruction
摘要：
Cosmic-ray muons are highly penetrating background-radiation particles found in natural environments. In this study, we develop and test a plastic scintillator muon detector based on machine-learning algorithms. The detector underwent muon position-resolution tests at the Institute of Modern Physics in Lanzhou using a multiwire drift chamber (MWDC) experimental platform. In the simulation, the same structural and performance parameters were maintained to ensure the reliability of the simulation results. The Gaussian process regression (GPR) algorithm was used as the position-reconstruction algorithm owing to its optimal performance. The results of the Time Difference of Arrival algorithm were incorporated as one of the features of the GPR model to reconstruct the muon hit positions. The accuracy of the position reconstruction was evaluated by comparing the experimental results with Geant4 simulation results. In the simulation, large-area plastic scintillator detectors achieved a position resolution better than 20 mm. In the experimental-platform tests, the position resolutions of the test detectors were 27.9 mm. We also analyzed factors affecting the position resolution, including the critical angle of the total internal reflection of the photomultiplier tubes and distribution of muons in the MWDC. Simulations were performed to image both large objects and objects with different atomic numbers. The results showed that the system could image high- and low-Z materials in the constructed model and distinguish objects with significant density differences. This study demonstrates the feasibility of the proposed system, thereby providing a new detector system for muon-imaging applications.
摘要：
A silica-supported copolymer loaded with bis (2-ethylhexyl) phosphate was prepared and first investigated for the separation of trace radium from natural 232Th. Results showed that the adsorbent was prepared successfully with ultrahigh selectivity and ultrafast adsorption kinetics towards thorium, making the separation easy and convenient. The chemical recovery rate to radium reached 96.7%, and the decontamination factor to thorium exceeded 105. Generally, this work demonstrated the feasibility of using this material and method to directly separate 228Ra and 224Ra from 232Th, rendering it significant in the future preparation and application of 212Pb.
摘要：
小型棒控压水堆舍弃了可溶硼,并高度依赖控制棒与可燃毒物棒控制堆芯的反应性.为研究控制棒对堆芯关键性能的影响,本文以核动力破冰船用KLT-40模型为对象,以轴向功率偏移、堆芯寿期、燃料利用率与径向功率峰因子为指标,开展长寿期小型棒控压水堆控制棒布置与动作策略设计分析.首先,基于OpenMC程序开发带棒燃耗程序;其次,比较堆芯带控制棒与无控制棒运行时的堆芯寿期等指标;最后,分析不同动作策略对轴向功率偏移等指标的影响.结果表明:控制棒将堆芯寿期从590 EFPDs(等效满功率天,Effective full power days)延长至650～698 EFPDs;低价值棒组优先动作策略使轴向功率偏移程度由-0.69与+0.80分别下降至-0.29与+0.52.因此,要准确计算长寿期压水堆寿期必须采用带控制棒燃耗计算策略,并且通过合理的动作策略能够有效减小控制棒带来的轴向功率偏移.
