Flexible self-supporting Na3MnTi(PO4)3@C fibers for uranium extraction from seawater by electro sorption
作者：
Chen, Yuliang;Yin, Xiangbiao;Zheng, Ningchao;Lin, Zheyang;Fujita, Toyohisa;...
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：
Electrodes;Electrostatics;Fibers;Seawater;Spinning (fibers);Uranium compounds;Adsorption performance;Eco-friendly;Electro adsorption;Electroadsorption;Electrode material;Electrosorption;Ion-transport;Nasicon;Uranium extraction;Uranyl ions;Adsorption;manganese;nanofiber;phosphate;sea water;sodium;titanium;uranium;absorption;adsorption;electrode;electron;extraction method;phosphate;seawater;uranium;adsorption kinetics;Article;chemisorption;complex formation;controlled study;diffusion;electrospinning;extraction;Fourier transform infrared spectroscopy;green chemistry;high resolution transmission electron microscopy;ion transport;recycling;sol-gel;static electricity;synthesis;X ray diffraction;X ray photoemission spectroscopy
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 Na3MnTi(PO4)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 5 ppm U(VI) in seawater by electro absorption within 1 h. 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. © 2023 Elsevier B.V.
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英文
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Abnormal magnetic behavior of prussian blue analogs modified with multi-walled carbon nanotubes
作者：
Mo, Jia-Jun;Xia, Pu-Yue;Shen, Ji-Yu;Chen, Hai-Wen;Lu, Ze-Yi;...
期刊：
中国物理B(英文) ,2023年32(4):047503 ISSN：1674-1056
通讯作者：
Xia, Yan-Fang(xiayfusc@126.com);Liu, Min(liuhart@126.com)
作者机构：
[Mo, Jia-Jun; Xia, Pu-Yue; Shen, Ji-Yu; Zhang, Qing-Hang; Xu, Shi-Yu; Liu, Min; Xia, Yan-Fang; Lu, Ze-Yi] Univ South China, Coll Nucl Sci & Technol, Hengyang 421001, Peoples R China.;[Chen, Hai-Wen] Xiamen Univ, Coll Energy, Xiamen 361005, Peoples R China.
通讯机构：
[Xia, Y.-F.; Liu, M.] C;College of Nuclear Science and Technology, China
关键词：
magnetostatic interaction;Monte Carlo simulation;multi-walled carbon nanotubes;prussian blue analogue
摘要：
This work examines the origin of the abnormal magnetism exhibited by CuMnFe-PBAs modified with multi-walled carbon nanotubes (MWCNTs). The system of CuMnFe-PBAs@MWCNTs coexists with both large and small clusters. CuMnFe-PBAs clusters have an average particle size of 28 nm, and some of the smaller particles are adsorbed on the surface of MWCNTs. Surprisingly, the magnitude of magnetization increases linearly with decreasing temperature. When above the Curie temperature, the magnitude of magnetization is significantly greater than that of PBAs without being modified. This phenomenon can be attributed to magnetostatic interactions between ultra-fine magnetic nanoparticles adsorbed on the surface of MWCNTs. Using the Monte Carlo method, we simulated the magnetostatic interaction of cylindrical adsorbed particles, and the simulation results are almost identical to those observed experimentally. The results indicate that 0.089 CuMnFe-PBAs clusters per 1 nm2 can be adsorbed onto the surface area of MWCNTs. We demonstrate that MWCNTs adsorbing magnetic particles exhibit magnetic behavior, and suggest a method for producing ultrafine materials. It also introduces a new method of calculating the adsorption efficiency of carbon nanotubes, offering theoretical guidance for future research on nanomaterials with enhanced adsorption efficiency. © 2023 Chinese Physical Society and IOP Publishing Ltd.
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英文
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Recent progress in radionuclides adsorption by bentonite-based materials as ideal adsorbents and buffer/backfill materials
作者：
Liu, Hongjuan* ;Fu, Tianyu;Sarwar, Muhammad Tariq;Yang, Huaming
期刊：
Applied Clay Science ,2023年232:106796 ISSN：0169-1317
通讯作者：
Liu, Hongjuan;Yang, HM
作者机构：
[Liu, Hongjuan; Sarwar, Muhammad Tariq; Liu, HJ; Yang, Huaming] China Univ Geosci, Engn Res Ctr Nanogeomat, Minist Educ, Wuhan 430074, Peoples R China.;[Fu, Tianyu; Liu, Hongjuan] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.;[Sarwar, Muhammad Tariq; Yang, Huaming] China Univ Geosci, Fac Mat Sci & Chem, Wuhan 430074, Peoples R China.;[Sarwar, Muhammad Tariq; Yang, Huaming] China Univ Geosci, Key Lab Funct Geomat China Nonmet Minerals Ind, Wuhan 430074, Peoples R China.;[Yang, Huaming] Cent South Univ, Sch Minerals Proc & Bioengn, Hunan Key Lab Mineral Mat & Applicat, Changsha 410083, Peoples R China.
通讯机构：
[Liu, HJ; Yang, HM ] C;China Univ Geosci, Engn Res Ctr Nanogeomat, Minist Educ, Wuhan 430074, Peoples R China.
关键词：
Adsorption;Bentonite;Physicochemical behaviour;Radionuclides
摘要：
The extensive use of nuclear energy and the rapid development of the nuclear industry have produced a large amount of harmful radionuclide-containing wastewater, and bentonite-based materials with high specific surface area and high adsorption affinity for radionuclides are ideal adsorbents in the treatment of radioactive wastewater. Furthermore, bentonite is also a suitable buffer/backfill material for a deep underground repository to dispose of stored nuclear waste, and adsorption processes between bentonite and radionuclides are of significant importance for the migration or retention of radionuclides from the repository. Therefore, the adsorption behaviour of bentonite-based materials for radionuclides has been extensively studied in recent years. This review presents the current status (about 25 years) of bentonite-based materials for adsorption radionuclides. The adsorption behaviours and mechanisms of radionuclides by bentonite-based materials investigated by various conventional and advanced techniques have been summarized. The main adsorption mechanisms of bentonite-based materials for radionuclides include ion exchange, electrostatic attraction, surface complexation, and hydrogen bonding. We introduce the adsorption of bentonite-based materials for common radionuclides such as U(VI), Cs(I), Sr(II), Eu(III), Am(III), Yb(III), La(III), Tc(VII), Th(IV), Pu(V)/(VI), Ra(II), and Co(II). Finally, we present the current challenges of using bentonite for treating radionuclide-containing effluents and as a buffer/backfill material for the geological repository. We believe that this review will provide a vital reference and guidance for future research and applications related to the radioactive wastewater treatment and the repository of nuclear waste disposal using bentonite-based materials. © 2022 Elsevier B.V.
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英文
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Magnetic amino-sulfonic dual sorbent for uranyl sorption from aqueous solutions – Influence of light irradiation on sorption properties
作者：
Hamza, Mohammed F.;Guibal, Eric;Wei, Yuezhou;Fouda, Amr
期刊：
Chemical Engineering Journal ,2023年456:141099 ISSN：1385-8947
通讯作者：
Guibal, Eric(eric.guibal@mines-ales.fr);Wei, Yuezhou(yzwei@usc.edu.cn)
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：
The association of magnetite microparticles with bi-functional amino-sulfonate polymer (obtained by condensation of guanidine and amino hydroxynaphthalene sulfonic acid, mediated by formaldehyde) allows synthesizing a magnetic composite sorbent (M−GANS). The sorbent bearing both amine and sulfonate groups is efficient for uranyl sorption at pH 4–5. The sorption isotherms are successfully fitted by the Temkin equation, while kinetics is controlled by the pseudo-first order rate equation. The sorption properties are increased by UV irradiation in terms of both sorption capacity (by 25 %, up to 1.25 mmol U g−1) and kinetics. The sorption occurs on both amine and sulfonate groups; the improvement in sorption properties under UV irradiation is tentatively assigned to the photo-reduction of uranyl species (mediated by magnetite particles and amine groups from polymer layer). The UV irradiation improves the selectivity of M−GANS for uranium against other metal ions, tested on both synthetic and real solutions. This improvement can be correlated to the higher propensity of uranyl to be photo-reduced compared with investigated competitor ions. The recycling of the sorbent was successfully tested for five successive cycles of sorption and desorption (stably complete): the loss in sorption performances is slightly reduced (less than 1.5 % at the fifth cycle) under UV irradiation compared with experiments performed under dark conditions (loss close to 4.2 %). The uranium peroxide precipitate obtained at the end of the treatment of acid leachate of ore shows higher purity when UV irradiation was applied. © 2022 Elsevier B.V.
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英文
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Poly-condensation of N-(2-acetamido)-2-aminoethanesulfonic acid with formaldehyde for the synthesis of a highly efficient sorbent for Cs(I)
作者：
Hamza, Mohammed F.;Guibal, Eric;Althumayri, Khalid;Wei, Yuezhou;Eid, Ahmed M.;...
期刊：
Chemical Engineering Journal ,2023年454:140155 ISSN：1385-8947
通讯作者：
Guibal, Eric(eric.guibal@mines-ales.fr)
作者机构：
[Wei, Yuezhou; Hamza, Mohammed F.] Univ South China, Sch Nucl Sci & Technol, Heng Yang 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.;[Althumayri, Khalid] Taibah Univ, Coll Sci, Dept Chem, Al Madinah Al Munawarah 30002, Saudi Arabia.;[Wei, Yuezhou] Shanghai Jiao Tong Univ, Sch Nucl Sci & Engn, Shanghai, Peoples R China.
通讯机构：
[Eric Guibal] P;[Yuezhou Wei] S;Polymers Composites and Hybrids (PCH), IMT Mines Ales, Alès, France<&wdkj&>School of Nuclear Science and Technology, University of South China, Heng Yang 421001, China<&wdkj&>School of Nuclear Science and Engineering, Shanghai Jiao Tong University, Shanghai, China
关键词：
Easy synthesis of a highly efficient sorbent for cesium through ready condensation of acetamido-aminomethanesulfonic acid (via formaldehyde reaction);Fast cesium uptake onto microparticles (fitted by the pseudo-first order rate equation);Good sorption performance in seawater;Limited toxicity against Gram+ and Gram- bacteria and pathogenic yeast, reduced cytotoxicity against normal cells (but inhibiting cancerous cells);Remarkable desorption and sorbent recycling using 0.3 M HNO3 solution;Selectivity against alkali and alkali-earth metal ions
摘要：
A new sorbent (ACES-F micro-particles) is readily synthesized by the one-pot reaction of N-(2-acetamido)-2-aminoethanesulfonic acid with formaldehyde (poly-condensation reaction). The mesoporous sorbent is charac-terized by BET analysis (SBET: approximate to 6 m2 g-1), SEM-EDX (N: approximate to 7-8 % and S: 5 %), FTIR spectroscopy (identification of amine, sulfonic groups and their interactions with metal ions), TGA, elemental analysis, and titration (pHPZC: approximate to 5.7). The study of pH effect on Cs(I) shows an optimum close to 8 (with intermediary optimum at pH 4, associated with different reactive groups). The micron-size sorbent shows fast sorption (equilibrium in 60 min) and the pseudo-first order rate equation fits the kinetic profile. The sorption isotherm reaches up to 1.99 mmol Cs g-1; the Langmuir equation models isotherm profiles. The sorption decreases with increasing temperature; sorption is exothermic. Cesium uptake is affected by the presence of NaCl; however, even in large excess of salt (i. e., 4 M) sorption remains relatively high (loss <60 %). Selectivity is confirmed by the remarkable preference of the sorbent for Cs against alkali and other competitor metal ions, especially at pHeq approximate to 7. Metal desorption is highly effective using 0.3 M HNO3 solutions: complete desorption occurs in 30 min. The sorbent can be recycled for at least five cycles (losses <3 %). The interest of ACES-F for cesium recovery from seawater is confirmed by the study of Cs(I) sorption (and other major elements) from Vietnam and Egypt samples. The safety of the sorbent for aqueous bodies is evaluated by the cytotoxicity of the sorbent (limited against normal cells but highly reactive for cancerous cells); while the sorbent shows interesting antimicrobial properties for Gram+, Gram-and path-ogenic yeast.
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英文
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Mössbauer and Magnetic Properties Investigation of REFe0.5Cr0.5O3 (RE=La, Y) Perovskite
作者：
Yang, Jiayun;Cao, Huanhuan;Lu, Zeyi;Mo, Jiajun;Zhou, Yang;...
期刊：
PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS ,2023年260(7):2300145- ISSN：0370-1972
通讯作者：
Xia, Yanfang(2009000477@usc.edu.cn);Liu, Min(2013000454@usc.edu.cn)
作者机构：
[Zhou, Yang; Liu, Min; Yang, Jiayun; Cao, Huanhuan; Lu, Zeyi; Mo, Jiajun; Gao, Kaiyang; Xia, Yanfang] Univ South China, Coll Nucl Sci & Technol, Hengyang 421001, Peoples R China.;[Xue, Xinhao] Civil Aviat Univ China, Coll Comp Sci & Technol, Tianjin 300000, Peoples R China.;[Liu, Min] Zhuhai Tsinghua Univ, Res Inst, Innovat Ctr, 101 Univ Ave, Zhuhai 519000, Peoples R China.
通讯机构：
[Yanfang Xia; Min Liu] 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<&wdkj&>College of Nuclear Science and Technology, University of South China, Hengyang, 421001 China
关键词：
Cr-doped LaFeO3;Cr-doped YFeO3;Fe/Cr cluster;Fe-III/IV;magnetic;properties;Mossbauer spectroscopy
摘要：
In this article, REFe0.5Cr0.5O3 (RE = La, Y) is prepared by sol–gel method, and the structure is characterized and analyzed by X‐ray diffraction, scanning electron microscopy, energy‐dispersive X‐ray spectroscopy, Mössbauer spectroscopy, and magnetism. A reference for future studies of the effect of clusters on Cr‐doped iron‐based calcium is provided. The synthesis of REFe0.5Cr0.5O3 (RE = La, Y) using the sol–gel method is focused and their structural differences are investigated. The results of X‐ray diffraction show that the change of ion radius at position A leads to varying degrees of octahedral distortion and spatial group structure. The scanning electron microscopy analysis reveals micron‐level particles with clear boundaries, while energy‐dispersive X‐ray spectroscopy and room temperature Mössbauer spectra indicate the presence of Fe/Cr clusters in the sample and the transitional valence of iron. Disorder in the B position leads to a saturation moment that is lower than the theoretical value. The thermomagnetic profile shows a reversal of magnetization due to the interaction between the single‐ion magnetic anisotropy and the antisymmetric Dzyaloshinskii–Moriya (DM) interaction, with a broader peak is observed due to cluster formation. The difference in negative magnetic field is due to the difference in net magnetic moment caused by different DM intensities.
语种：
英文
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Fast removal of strontium from nitric acid solution using an acid-resistant silica-based adsorbent
作者：
Zhang, Shichang;Huang, Qunying;Chen, Lifeng;Yin, Xiangbiao;Hamza, Mohammed F.;...
期刊：
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING ,2023年11(5):110529 ISSN：2213-2929
通讯作者：
Huang, QY;Ning, SY
作者机构：
[Huang, Qunying; Zhang, Shichang; Huang, QY] Chinese Acad Sci, Inst Nucl Energy Safety Technol, Hefei Inst Phys Sci, Hefei 230031, Peoples R China.;[Huang, Qunying; Zhang, Shichang] Univ Sci & Technol China, Hefei 230026, Peoples R China.;[Ning, Shunyan; Wei, Yuezhou; Hamza, Mohammed F.; Yin, Xiangbiao; Chen, Lifeng] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.;[Wei, Yuezhou] Shanghai Jiao Tong Univ, Sch Nucl Sci & Engn, Shanghai 200240, Peoples R China.;[Ning, Shunyan] Univ South China, Sch Nucl Sci & Technol, 28 Changsheng West Rd, Hengyang 421001, Peoples R China.
通讯机构：
[Ning, SY ] U;[Huang, QY ] C;Chinese Acad Sci, Inst Nucl Energy Safety Technol, Hefei Inst Phys Sci, Hefei 230031, Peoples R China.;Univ South China, Sch Nucl Sci & Technol, 28 Changsheng West Rd, Hengyang 421001, Peoples R China.
关键词：
Adsorption isotherms;Density functional theory;Impregnation;Molecules;Silica;Strontium;Styrene;Adsorption selectivity;Density-functional theory calculations;High-level liquid waste;Hybrid adsorbents;Inorganic-organic hybrid;Modified silica;Nitric acid solutions;Styrene-divinylbenzene;Vacuum impregnation;Vacuum impregnation method;Adsorption
摘要：
To efficiently separate strontium (Sr) from simulated high level liquid waste (HLLW), a novel acid-resistant inorganic-organic hybrid adsorbent, named as HEMAP/SiO2-P, was prepared by loading 2-hydroxyethyl-2-methyl-2-propenoate phosphate (HEMAP) into styrene-divinylbenzene modified silica (SiO2-P) with vacuum impregnation method. The experimental results showed that the adsorbent exhibited good adsorption selectivity with the SFSr/metal ions over 64.2 in 3 M HNO3 simulated HLLW. In addition, the adsorption of Sr by the adsorbent was in accordance with the pseudo-second-order kinetic model and the Langmuir isotherm model, and the adsorption equilibrium was obtained within 1 min with the saturation adsorption capacity of 61.2 mg/g. The adsorption of Sr was not markedly changed with increasing temperature. Furthermore, the results of adsorption experiments, characterization analysis, extraction experiments and density functional theory (DFT) calculations revealed that two organic ligand molecules were coordinated with one Sr molecule and simultaneously involved two nitrate molecules to maintain the charge balance during the adsorption process. © 2023 Elsevier Ltd
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英文
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Single event effect evaluation of different communication ways based on 40nm SRAM-FPGA
作者：
Xu Zhao;Xuecheng Du;Xu Xiong;Zhi Chen;Wei Jiang
期刊：
Third International Conference on Artificial Intelligence and Computer Engineering (ICAICE 2022) ,2023年12610:146 ISSN：1996-756X
通讯作者：
Du, Xuecheng(duxuecheng@usc.edu.cn)
作者机构：
[Xu Zhao; Xuecheng Du; Xu Xiong] School of Nuclear Science and Technology, University of South China, Hengyang City;421001, China;[Zhi Chen; Wei Jiang] Science and Technology on Reactor System Design Technology Laboratory, Nuclear Power Institute of China, Chengdu;610213, China;[Xu Zhao; Xuecheng Du; Xu Xiong] 421001, China
摘要：
Field-programmable gate array (FPGA) is now considered by an increasing number of designers in various fields of application, such as space and aircraft embedded control systems, image and signal processing. It is a popular way to design different serial communication protocols including serial and network communications implemented by FPGA, which ensure data transfer accuracy and timing. However, single event effects (SEE) can pose a serious threat to the reliability of FPGA in the radiation environments. In order to evaluate the reliability and failure modes of different communication interfaces in radiation environments, three communication protocols were tested by alpha radiation source, including universal asynchronous receiver/transmitter (UART), ethernet, and universal serial bus (USB). The experiments have presented the failure modes and SEE cross sections to different communication ways. © 2023 SPIE.
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英文
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The ability of BC3 to remove Cs from nuclear wastewater
作者：
Zhou, Nan;Qin, Yong;Zhang, Yang;Wu, Feihong;Yu, Wantang;...
期刊：
International Journal of Quantum Chemistry ,2023年123(8):e27072- ISSN：0020-7608
通讯作者：
Wu, Xijun(wuxijunusc@163.com)
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] S;School of Mathematics and Physics, University of South China, Hengyang, China
关键词：
Cesium;Density functional theory;Electronic structure;Graphene;Radioisotopes;Adsorption characteristic;Adsorption energies;Adsorption rates;Cs;Density-functional-theory;Electronic.structure;First principles;Systematic analysis;Two-dimensional materials;Two-materials;Adsorption
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. © 2022 Wiley Periodicals LLC.
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英文
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Uranium capture by a layered 2D/2D niobium phosphate/holey graphene architecture via an electro-adsorption and electrocatalytic reduction coupling process
作者：
Liao, Yun;Lei, Ruilin;Weng, Xiaofang;Yan, Chuan;Fu, Jiaxi;...
期刊：
Journal of Hazardous Materials ,2023年442:130054 ISSN：0304-3894
通讯作者：
Wang, Meng(wmeng020321@163.com)
作者机构：
[Weng, Xiaofang; Fu, Jiaxi; Lei, Ruilin; Zhang, Chen; Wei, Guoxing; Liao, Yun] Univ South China, Sch Chem & Chem Engn, Hengyang 421001, Hunan, Peoples R China.;[Wang, Hongqing; Liao, Yun] Univ South China, Hunan key Lab Design & Applicat Actinide Complexes, Hengyang 421001, Hunan, Peoples R China.;[Yan, Chuan; Wang, Meng] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Hunan, Peoples R China.
通讯机构：
[Wang, Hongqing; Liao, Yun] H;[Wang, Meng] S;Hunan key laboratory for the design and application of actinide complexes, University of South China, Hengyang, Hunan 421001, PR China. Electronic address:;School of Nuclear Science and Technology, University of South China, Hengyang, Hunan 421001, China. Electronic address:;Hunan key laboratory for the design and application of actinide complexes, University of South China, Hengyang, Hunan 421001, PR China. Electronic address:
关键词：
Electrocatalysis;Electrodes;Energy efficiency;Graphene;Niobium compounds;'current;Capacitive deionization;Coupling process;Eco-friendly;Electro-adsorption;Electrocatalytic reduction;Energy efficient;Grapheme;Surface active sites;U(VI);Adsorption;activated carbon;graphene;graphene oxide;nanosheet;niobium;phosphate;polyvinylidene fluoride;uranium;adsorption;electrical method;electrokinesis;niobium;reduction;uranium;adsorption kinetics;Article;catalysis;controlled study;cross coupling reaction;crystal structure;current density;cyclic voltammetry;desorption;electron transport;high resolution transmission electron microscopy;impedance spectroscopy;ion transport;physical chemistry
摘要：
As an energy-efficient and eco-friendly technique, capacitive deionization (CDI) has shown great potential for uranium (U(VI)) capture recently. However, extracting U(VI) with high kinetics, capacity and selectivity remains a major challenge due to the current surface active sites-based material and co-existing ions in aqueous solution. Here we rationally designed a layered 2D/2D niobium phosphate/holey graphene (HGNbP) electrode material, and originally demonstrated its efficient U(VI) capture ability via an electro-adsorption and electrocatalytic reduction coupling process. The less-accumulative loose layered architecture, open polycrystalline construction of niobium phosphate with active phosphate sites, and rich in-plane nano-pores on conductive graphene nanosheets endowed HGNbP with fast charge/ion transport, high electroconductivity and superior pseudocapacitance, which enabled U(VI) ions first to be electro-adsorbed, then physico-chemical adsorbed, and finally electrocatalysis reduced/deposited onto electrode surface without the limitation of active sites under a low potential of 1.2 V. Based on these virtues, the HGNbP exhibited a fast adsorption kinetics, with a high removal rate of 99.9% within 30 min in 50 mg L−1 U(VI) solution, and a high adsorption capacity up to 1340 mg g−1 in 1000 mg L−1 U(VI) solution. Furthermore, the good recyclability and selectivity towards U(VI) were also realized. © 2022 Elsevier B.V.
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英文
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Synthesis, characterization, and evaluation of thiocarbazide-functionalized maleic-based polymer for thorium (IV) removal from aqueous solutions
作者：
Hamza, Mohammed F.;Guibal, Eric;Wei, Yuezhou;Ning, Shunyan
期刊：
Chemical Engineering Journal ,2023年464:142638 ISSN：1385-8947
通讯作者：
Wei, YZ;Guibal, E
作者机构：
[Ning, Shunyan; Wei, Yuezhou; Hamza, Mohammed F.] Univ South China, Sch Nucl Sci & Technol, Heng Yang 421001, Peoples R China.;[Guibal, Eric; Guibal, E] IMT Mines Ales, Polymers Compos & Hybrids PCH, Ales, France.;[Wei, Yuezhou] Shanghai Jiao Tong Univ, Sch Nucl Sci & Engn, Shanghai, Peoples R China.
通讯机构：
[Wei, YZ ] U;[Guibal, E ] I;Univ South China, Sch Nucl Sci & Technol, Heng Yang 421001, Peoples R China.;IMT Mines Ales, Polymers Compos & Hybrids PCH, Ales, France.;Shanghai Jiao Tong Univ, Sch Nucl Sci & Engn, Shanghai, Peoples R China.
关键词：
The functionalization of the copolymer of;maleic anhydride withN;N'-methylenebisacrylamide (MaMb) obtained by;the reaction of pristine sorbent with thiocarbazide (TcMaMb) increases the density;and diversity of reactive groups;The chemical derivative strongly enhances the;sorption properties of the material for Th(IV);removal;Faster kinetics are obtained together with doubled sorption capacity at saturation;The selectivity for thorium binding from;complex synthetic solutions (especially at pH;>4) and real ore leachate (in acidic solution but;with lower sorption capacities) is enhanced by;the grafting of thiocarbazide;The readily functionalization of MaMb with thiocarbazide opens promising perspective for;the recovery of thorium from complex solutions
摘要：
The copolymerization of maleic anhydride with N,N’-methylenebisacrylamide allowed synthesizing a sorbent (MaMb) that can be functionalized by amidoacidification (for grafting thiocarbazide) (synthesis of TcMaMb). The two sorbents are tested in batch systems for the removal of thorium from aqueous solutions. The characterization of the materials shows similar textural properties and the involvement of amine, carboxylic groups (for MaMb), completed with thiocarbonyl groups (for TcMaMb), in the binding of Th(IV). The maximum sorption occurs at pH close to 4 and the functionalization doubles the maximum sorption capacity (up to 1.36 mmol Th g−1). The sorption isotherm for TcMaMb is fitted by the Langmuir equation (in the case of pristine sorbent, the saturation of the sorbent is not achieved in the tested concentration range making the Freundlich equation more appropriate). The functionalization improves the uptake kinetics (equilibrium time decreased from 120-180 min to 30 min), and kinetic profiles are fitted by the pseudo-first order rate equation. The selectivity of the sorbent for Th(IV) (and to a certain extent U(VI)) is improved by thiocarbazide grafting, especially at pH above 4 (in the case of equimolar multi-component solutions). The functionalization of MaMb also enhances the selectivity of TcMaMB for thorium when applied to metal removal from pre-treated mining leachate (consistently with synthetic solutions). Bound metal can be readily desorbed (complete desorption achieved in 30 min) using 0.3 M HCl solutions for both MaMb and TcMaMb sorbents. Another advantage brought by the functionalization concerns the stability of the sorbent at recycling: after five cycles of re-use the sorption efficiency decreases by less than 2 % (meaning less than for MaMb, at about 8 %). © 2023 Elsevier B.V.
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英文
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Study on Resistance Characteristics of Capillary Flow in Screen Wick Based on CFD Method [基于 CFD 方法的丝网芯内毛细流动阻力特性研究]
作者：
余清远;赵鹏程;马誉高;张英楠
期刊：
核动力工程 ,2023年44(1):54-59 ISSN：0258-0926
通讯作者：
Zhao, Pengcheng(zhaopengcheng1030@163.com)
作者机构：
[余清远; 赵鹏程] School of Nuclear Science and Technology, University of South China, Hunan, Hengyang;421001, China;[马誉高; 张英楠] Science and Technology on Reactor System Design Technology Laboratory, Nuclear Power Institute of China, Chengdu;610213, China;Department of Engineering Physics, Tsinghua University, Beijing
关键词：
丝网芯;流动阻力;粘性阻力;惯性阻力;毛细性能因子
摘要：
丝网芯热管是一种基于两相流动相变循环原理设计的非能动输热设备,循环中的毛细力与流动阻力均与丝网芯结构密切相关,研究丝网芯的阻力特性对丝网芯结构选型与优化、热管性能提升具有重要的意义。本文基于计算流体力学(CFD)方法,建...展开更多 丝网芯热管是一种基于两相流动相变循环原理设计的非能动输热设备,循环中的毛细力与流动阻力均与丝网芯结构密切相关,研究丝网芯的阻力特性对丝网芯结构选型与优化、热管性能提升具有重要的意义。本文基于计算流体力学(CFD)方法,建立丝网毛细流动的阻力模型,研究流体在多层丝网芯内的毛细流动的阻力特性。使用本文模型模拟毛细提升实验,模型与实验结果的相对误差小于5%。基于模型进一步分析堆叠结构及目数(50目、200目、400目)对丝网芯的流动阻力特性的影响。结果表明,堆叠丝网的网孔越密集流动阻力越大,粘性阻力系数近似与丝网目数呈正比,而等效惯性阻力也随丝网目数增加而增大;在雷诺数小于1的低流速区域,粘性阻力占据主导作用,而在雷诺数大于1的流速区域惯性阻力作用不可忽略;丝网芯的几何结构除影响流动阻力还将对毛细力产生影响。计算表明,丝网毛细压强和流动阻力均随丝网目数的增加而增强,毛细性能因子随目数的增加而增速放缓。考虑到平织丝网的工艺限制,400目丝网较为理想。收起
语种：
中文
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Development of Reduced-Order Thermal Stratification Model for Upper Plenum of Lead-Bismuth Fast Reactor Based on CFD [基于 CFD 的铅铋快堆上腔室降阶热分层模型开发]
作者：
杨涛;赵鹏程;赵亚楠;于涛
期刊：
核动力工程 ,2023年44(2):48-53 ISSN：0258-0926
通讯作者：
Zhao, Pengcheng(pengcheng.zhao@usc.edu.cn)
作者机构：
[于涛; 赵鹏程; 赵亚楠; 杨涛] School of Nuclear Science and Technology, University of South China, Hunan, Hengyang;421001, China;Hunan Engineering and Technology Research Center for Virtual Nuclear Reactor, University of South China, Hunan, Hengyang;[于涛; 赵鹏程; 赵亚楠; 杨涛] 421001, China<&wdkj&>Hunan Engineering and Technology Research Center for Virtual Nuclear Reactor, University of South China, Hunan, Hengyang;[于涛; 赵鹏程; 赵亚楠; 杨涛] 421001, China
关键词：
铅铋快堆上腔室;热分层;计算流体动力学(CFD);特征正交基分解(POD)
摘要：
在铅铋快堆紧急停堆后,上腔室发生热分层现象对堆内结构完整性和自然循环余热排出能力产生重要影响,需要重点关注。为克服传统热分层分析方法的缺陷,基于计算流体动力学(CFD)程序Fluent得到高精度的全阶快照,通过特征正交基...展开更多 在铅铋快堆紧急停堆后,上腔室发生热分层现象对堆内结构完整性和自然循环余热排出能力产生重要影响,需要重点关注。为克服传统热分层分析方法的缺陷,基于计算流体动力学(CFD)程序Fluent得到高精度的全阶快照,通过特征正交基分解(POD)与Galerkin投影结合的方法构建降阶热分层模型。通过与CFD全阶热分层模型对热分层现象进行对比分析,研究结果表明所开发的降阶热分层模型能很好地模拟上腔室温度分布,能快速地开展铅铋快堆事故下的热分层界面特性研究。本文研究对热分层现象产生机理、有效遏制热分层现象产生提供了重要分析工具。收起
语种：
中文
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Update to the Newly Developed Expression for the Stability Ratio of Colloidal Dispersions
作者：
Li, Yongmei;Meng, Shuo;Li, Chunguang;Liu, Longcheng
期刊：
LANGMUIR ,2023年39(15):5284-5293 ISSN：0743-7463
通讯作者：
Li, Chunguang(lichunguang1983@163.com);Liu, Longcheng(lliu@ket.kth.se)
作者机构：
[Li, Yongmei; Li, Chunguang] Univ South China, Sch Resource Environm & Safety Engn, Hengyang 421001, Peoples R China.;[Li, Yongmei; Liu, Longcheng; Meng, Shuo; Li, Chunguang] Univ South China, R&D & Modeling Ctr Treatment & Disposal Radioact, Hengyang 421001, Peoples R China.;[Liu, Longcheng] Royal Inst Technol KTH, Chem Engn, S-10044 Stockholm, Sweden.;[Liu, Longcheng] Beijing Res Inst Chem Engn & Met, Beijing 101149, Peoples R China.
通讯机构：
[Chunguang Li] S;[Longcheng Liu] R;R & D and Modeling Center for Treatment and Disposal of Radioactive Waste, University of South China, Hengyang 421001, China<&wdkj&>Chemical Engineering, Royal Institute of Technology KTH, Stockholm 10044, Sweden<&wdkj&>Beijing Research Institute of Chemical Engineering and Metallurgy, Beijing 101149, China<&wdkj&>School of Resource Environment and Safety Engineering, University of South China, Hengyang 421001, China<&wdkj&>R & D and Modeling Center for Treatment and Disposal of Radioactive Waste, University of South China, Hengyang 421001, China
关键词：
Particle size;Stability;Colloidal dispersion;Colloidal Stability;Counterions;Critical coagulation concentration;Particles sizes;Potential constants;Property;Secondary minimums;Spherical particle;Stability ratio;Coagulation
摘要：
The colloidal stability, one of the basic and important properties of a colloidal dispersion, is commonly evaluated in terms of the stability ratio. In this study, a recently developed expression for the stability ratio is updated, by reformulating the fraction of successful collisions leading to secondary minimum coagulation. The updated formula reinterprets the statistical meaning of the fraction of successful collisions leading to primary or secondary minimum coagulation, ensuring that the total fraction of successful collisions is always less than or equals to 1. It was shown to be superior to the available expressions in accounting for the contribution of the primary and secondary minimum coagulations on the stability ratio. It can well interpret the stability of colloidal dispersions of spherical particles; moreover, it is of great potential to be applied to colloidal dispersions of plate-like particles. In addition, this formula is found to be consistent with the concept of the critical coagulation concentration and well interpret the effects of particle size, counterion valence, surface potential, and Hamaker constant on the colloidal stability. © 2023 American Chemical Society.
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英文
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Experimental Investigation of Cobalt Deposition on 304 Stainless Steel in Borated and Lithiated High-Temperature Water
作者：
Deng, Jian;Lei, Jieheng;Wang, Guolong;Zhong, Lin;Zhao, Mu;...
期刊：
Materials ,2023年16(10):3834- ISSN：1996-1944
通讯作者：
Lei, ZY
作者机构：
[Lei, Zeyong; Deng, Jian; Lei, ZY; Zhong, Lin] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.;[Wang, Guolong; Deng, Jian] Univ South China, Sch Mech Engn, Hengyang 421001, Peoples R China.;[Lei, Jieheng] Univ South China, Sch Elect Engn, Hengyang 421001, Peoples R China.;[Zhao, Mu] China Nucl Ind 24 Construct Co Ltd, Beijing 102400, Peoples R China.
通讯机构：
[Lei, ZY ] U;Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.
关键词：
Austenitic stainless steel;Glow discharges;Inductively coupled plasma;Ion exchange;Ions;Iron compounds;Nuclear fuels;Nuclear power plants;Optical emission spectroscopy;Pressurized water reactors;Scanning electron microscopy;Steel corrosion;X ray photoelectron spectroscopy;304 stainless steel;Cobalt deposition;Cobalt ion;Corrosion products;Experimental investigations;High-temperature water;Pressurised water reactor;Primary loop;Spinel;Stainless steel surface;Deposition
摘要：
The radioactive corrosion products 58Co and 60Co in the primary loops of pressurized water reactors (PWRs) are the main sources of radiation doses to which workers in nuclear power plants are exposed. To understand cobalt deposition on 304 stainless steel (304SS), which is the main structural material used in the primary loop, the microstructural characteristics and chemical composition of a 304SS surface layer immersed for 240 h in borated and lithiated high-temperature water containing cobalt were investigated with scanning electron microscopy (SEM), X-ray diffraction (XRD), laser Raman spectroscopy (LRS), X-ray photoelectron spectroscopy (XPS), glow discharge optical emission spectrometry (GD-OES), and inductively coupled plasma emission mass spectrometry (ICP-MS). The results showed that two distinct cobalt deposition layers (an outer layer of CoFe2O4 and an inner layer of CoCr2O4) were formed on the 304SS after 240 h of immersion. Further research showed that CoFe2O4 was formed on the metal surface by coprecipitation of the iron preferentially dissolved from the 304SS surface with cobalt ions from the solution. The CoCr2O4 was formed by ion exchange between the cobalt ions entering the metal inner oxide layer and (Fe, Ni) Cr2O4. These results are useful in understanding cobalt deposition on 304SS and have a certain reference value for exploring the deposition behavior and mechanism of radionuclide cobalt on 304SS in the PWR primary loop water environment. © 2023 by the authors.
语种：
英文
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Revealing the microstructural evolution and its influence on mechanical properties of heterostructured steel fabricated by laser melting deposition
作者：
Liu, Hao;Wu, Wenxing;Yang, Tong;Qiu, Changjun;Chen, Pinghu
期刊：
Journal of Materials Research and Technology ,2023年24:4935-4944 ISSN：2238-7854
通讯作者：
Chen, PH
作者机构：
[Liu, Hao; Qiu, Changjun] Univ South China, Sch Resource Environm & Safety Engn, Hengyang 421001, Peoples R China.;[Wu, Wenxing; Qiu, Changjun] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.;[Yang, Tong; Qiu, Changjun] Univ South China, Coll Mech Engn, Hengyang 421001, Peoples R China.;[Chen, Pinghu] Shenzhen Univ, Coll Mechatron & Control Engn, Shenzhen 518060, Peoples R China.;[Chen, PH] Shenzhen Univ, Coll Mechatron & Control Engn, Shenzhen 518060, Peoples R China.
通讯机构：
[Chen, PH ] ;Shenzhen Univ, Coll Mechatron & Control Engn, Shenzhen 518060, Peoples R China.
关键词：
3D printing;Deposition;Economic and social effects;Elongation;Maraging steel;Melting;Microstructural evolution;Strengthening (metal);Tensile strength;Thermal stress;% reductions;Ageing treatments;Heterostructured material;Laser melting deposition;Nanoscale intermetallic compounds;Second phase strengthening;Solution-aging;Strengthening mechanisms;Ultimate tensile strength;Variable ratio;Powders
摘要：
A series of heterostructured materials with variable ratio of 316 powders in 18Ni300 powders were prepared by laser melting deposition (LMD). The microstructural evolution and its influence on tensile features were explored before/after aging treatment or solution-aging treatment. The results indicated that the fraction of γ phase was increased gradually with increasing 316SS, and dislocation caused by the deformation could be migrated and annihilated within the region of γ phase, second phase strengthening could contribute to excellent elongation for 18Ni300 maraging steel. The elongation of the AF4 sample was 235.2% higher than that of the AF0 sample when a 37.5% reduction in the ultimate tensile strength occurred. In addition, thermal stress could exist in the as-cladded sample, an appropriate heat treatment could release the thermal stress and precipitate nanoscale intermetallic compound. Their synergistic effect could contribute to overcoming the strength-elongation trade-off. A relatively ideal sample, a discontinuous γ phase surrounded by α phase, which displayed high strength of 1678.4 MPa with high elongation of 10.9% after solution-aging treatment. Compared with laser cladded 18Ni300 maraging steel, a 41.7% increment in the elongation was obtained at the cost of 11.3% reduction in ultimate tensile strength. © 2023 The Author(s)
语种：
英文
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Mössbauer Spectroscopic Analysis of La1−xSrxFeO3−δ Perovskites
作者：
Lu, Zeyi;Shen, Jiyu;Zou, Jiangqiang;Zhang, Qinghang;Mo, Jiajun;...
期刊：
PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS ,2023年260(4):2200511- ISSN：0370-1972
通讯作者：
Xia, Yanfang(xiayfusc@126.com);Liu, Min(liuhart@126.com)
作者机构：
[Shen, Jiyu; Zhang, Qinghang; Wu, Zhongjin; Liu, Min; Lu, Zeyi; Zou, Jiangqiang; Mo, Jiajun; Xia, Yanfang] Univ South China, Coll Nucl Sci & Technol, Hengyang 421001, Peoples R China.;[Liu, Min] Zhuhai Tsinghua Univ, Res Inst Innovat Ctr, 101 Univ Ave,Tangjiawan, Zhuhai 519000, Peoples R China.
通讯机构：
[Yanfang Xia; Min Liu] C;College of Nuclear science and Technology, University of South China, Hengyang, 421001 China<&wdkj&>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
关键词：
electronic structure;La1-xSrxFeO3-delta;Mossbauer;perovskite
摘要：
<jats:sec><jats:label /><jats:p>Herein, the effects of different Sr content doping on the crystal structure and electronic structure of La<jats:sub>1−<jats:italic>x</jats:italic></jats:sub>Sr<jats:sub><jats:italic>x</jats:italic></jats:sub>FeO<jats:sub>3−<jats:italic>δ</jats:italic></jats:sub> (LSFO‐<jats:italic>x</jats:italic>, <jats:italic>x</jats:italic> = 0, 0.2, 0.5, 0.8, 1.0) are studied by X‐ray diffraction (XRD) and Mössbauer spectroscopy. It is shown in the XRD results that the structure of LSFO‐<jats:italic>x</jats:italic> changes from orthorhombic (Pnma [#62]) to cubic (Pm‐3m (#221)) to tetragonal (I4/mmm (#139)) with increasing strontium doping. It is shown in Mössbauer spectrum analysis that with the gradual increase of Sr doping, iron ions finally change from +3 oxidation state to +4 oxidation state after passing through an intermediate oxidation state of +3.5. The Fe<jats:sup>3.5+</jats:sup> state can result from rapid electron exchange (Fe<jats:sup>3+</jats:sup> + Fe<jats:sup>4+</jats:sup> ⇋ Fe<jats:sup>4+</jats:sup> + Fe<jats:sup>3+</jats:sup>) between iron ions of different oxidation states within the crystal structure; the study provides some reference for future research to study the effect of iron‐oxidation state on the specific activity of strontium‐doped LaFeO<jats:sub>3</jats:sub>.</jats:p></jats:sec>
语种：
英文
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Stability Analysis of Alfvén Eigenmodes in the Experimental Advanced Superconducting Tokamak
作者：
Yang, Wenjun;Li, Guoqiang;Gao, Xiang;Gong, Xueyu
期刊：
Fusion Science and Technology ,2023年79(5):528-536 ISSN：1536-1055
通讯作者：
Gong, Xueyu(gongxueyu@126.com)
作者机构：
[Yang, Wenjun] Univ South China, Sch Elect Engn, Hengyang 421001, Hunan, Peoples R China.;[Li, Guoqiang; Gao, Xiang] Chinese Acad Sci, Inst Plasma Phys, Hefei 230031, Anhui, Peoples R China.;[Gong, Xueyu] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Hunan, Peoples R China.
通讯机构：
[Xueyu Gong] U;University of South China, School of Nuclear Science and Technology, Hengyang, Hunan421001, China
关键词：
Alfvén eigenmode;EAST;fast ion;NOVA/NOVA-K
摘要：
The stability of Alfvén eigenmodes (AEs) driven by fast ions is investigated in the Experimental Advanced Superconducting Tokamak (EAST). It is demonstrated that all AEs found in toroidal AE gaps are stable and that the least stable mode is a reversed shear Alfvén eigenmode (RSAE) with (Formula presented.). The calculation results show that collisional damping is the main damping mechanism for toroidal mode number (Formula presented.). The excitation threshold for the RSAE is about β crit,b = 3.33%, bigger than the value of the central beam ion beta β b = 1.01%. The results show that AEs driven by fast ions are stable in EAST, at least for the parameters shown in this work. The effect of beam ion pressure and energy on AE stability is also presented. The drive coming from fast ions increases with the pressure gradient, and the drive mainly comes from (Formula presented.) 3 resonance. © 2023 American Nuclear Society.
语种：
英文
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Investigating the large signal phenomenon in single photo-electron measurements of the 20-inch MCP-PMT
作者：
Yang, A.;Qin, Z.;Wang, Z.;Luo, F.;Yi, R.
期刊：
Journal of Instrumentation ,2023年18(5):P05029 ISSN：1748-0221
通讯作者：
Qin, Z;Luo, F
作者机构：
[Qin, Z.; Yang, A.; Wang, Z.] Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China.;[Qin, Z.; Yang, A.; Wang, Z.] State Key Lab Particle Detect & Elect, Beijing 100049, Peoples R China.;[Luo, F.; Luo, F] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Hunan, Peoples R China.;[Yi, R.] Xian Univ Finance & Econ, Sch Management, Xian 710100, Peoples R China.
通讯机构：
[Luo, F ] U;[Qin, Z ] C;Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China.;State Key Lab Particle Detect & Elect, Beijing 100049, Peoples R China.;Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Hunan, Peoples R China.
关键词：
20-inch MCP-PMT;Large signal phenomenon;Large signal phenomenon parameter;Large-signals;MCP-PMT;Measurements of;Photo-electrons;Single photo- electron;Photoelectron spectroscopy
摘要：
In this paper, we investigated a large signal phenomenon (LSP) in single photo- electron (SPE) measurement of the 20-inch MCP-PMT. The LSP will cause a long tail of the PMT output charge spectrum, and it will affect the calculation of the number of photoelectrons (PEs) collected and the gain of the PMT. To evaluate the LSP of the 20-inch MCP-PMT, a parameterization method is developed, by measurement of the LSP distribution in the full photocathode of the PMT and study of LSP variation with different voltage ratios applied for the PMT. © 2023 IOP Publishing Ltd and Sissa Medialab
语种：
英文
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Achieving significant performance recovery of SiPMs’ irradiation damage with in-situ current annealing
作者：
Gu, Fengbo;Liu, Yaqing;Sun, Xilei* ;Xu, Yanbing;Zhang, Dali;...
期刊：
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT ,2023年1053:168381 ISSN：0168-9002
通讯作者：
Qu, GP;Sun, Xilei;Xu, YB
作者机构：
[Qu, GP; Gu, Fengbo; Qu, Guopu] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Hunan, Peoples R China.;[Xiong, Shaolin; Xu, Yanbing; Wen, Xiangyang; Zhang, Fan; Sun, Xilei; An, Zhenghua; Gong, Ke; Li, Xinqiao; Liu, Yaqing; Sun, XL; Zhang, Dali] Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China.;[Sun, Xilei] Chinese Acad Sci, Inst High Energy Phys, State Key Lab Particle Detect & Elect, Beijing 100049, Peoples R China.;[Xiong, Shaolin; Wen, Xiangyang; Zhang, Fan; An, Zhenghua; Gong, Ke; Li, Xinqiao; Liu, Yaqing; Xu, Yanbing; Zhang, Dali] Chinese Acad Sci, Inst High Energy Phys, Key Lab Particle Astrophys, Beijing 100049, Peoples R China.;[Wang, Chenger] Gen Res Inst Nonferrous Met, Natl Engn Res Ctr Rare Earth Mat, Beijing 100088, Peoples R China.
通讯机构：
[Xu, YB ; Sun, XL] C;[Qu, GP ] U;Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Hunan, Peoples R China.;Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China.
关键词：
Annealing;Dark currents;Irradiation;Nuclear fuels;Nuclear power plants;Additional heating;Annealing current;Current annealing;Current heating;Heating devices;In-situ annealing;Irradiation Damage;Performance;Performance recovery;Silicon photo multipliers (SiPM);Radiation damage
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. © 2023 Elsevier B.V.
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英文
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