作者机构：
[Li, Xian-Kai; He, Peng-Qin; An, Zhen-Dong; Tang, Ren-Guang; Zhou, Tao; Yang, Gao-Le; Wang, Jing; An, ZD] Sun Yat Sen Univ, Sch Phys & Astron, Zhuhai 519082, Peoples R China.;[Li, Xin-Xiang; Hu, Xin-Rong; An, Zhen-Dong; An, ZD] Chinese Acad Sci, Shanghai Inst Appl Phys, Shanghai 201800, Peoples R China.;[An, Zhen-Dong; Qiu, Wei-Wei; Liao, Zheng-Fa; An, ZD; Zhuang, Zi-Yue; Zhang, Xiao-Ping] Macau Univ Sci & Technol, State Key Lab Lunar & Planetary Sci, Macau 999078, Peoples R China.;[An, Zhen-Dong; Qiu, Wei-Wei; Liao, Zheng-Fa; An, ZD; Zhuang, Zi-Yue; Zhang, Xiao-Ping] CNSA Macau Ctr Space Explorat & Sci, Macau 999078, Peoples R China.;[Gao, Ke-Qing; Jiang, Wei; Fan, Rui-Rui; Sun, Kang; Tan, Zhi-Xin; Chen, Yong-Hao; Yi, Han; Tang, Jing-Yu; Gu, Min-Hao; Li, Qiang; Zhang, Yue; Jing, Han-Tao] Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, 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.
关键词：
Time-of-flight technique;Neutron capture cross sections;Maxwell average cross sections
摘要：
The neutron capture cross sections (
$${n,\gamma }$$
) of bromine were obtained using the time-of-flight technique at the Back-n facility of the China Spallation Neutron Source. Prompt
$$\gamma$$
-rays originating from neutron-induced capture events were detected using four C
$${}_6$$
D
$${}_6$$
detectors. The pulse-height weighting technique and double-bunch unfolding method based on Bayesian theory were used in the data analysis. Background deductions, normalization, and corrections were carefully considered to obtain reliable measurement results. The multilevel R-matrix Bayesian code SAMMY was used to extract the resonance parameters in the resolved resonance region (RRR). The average cross sections in the unresolved resonance region (URR) were obtained from 10 to 400 keV. The experimental results were compared with data from several evaluated libraries and previous experiments in the RRR and URR. The TALYS code was used to describe the average cross sections in the URR. The astrophysical Maxwell average cross sections (MACSs) of
$${}^{79,81}$$
Br from kT = 5 to 100 keV were calculated over a sufficiently wide range of neutron energies. At a thermal energy of
$$kT=30$$
keV, the MACS value for
$${}^{79}$$
Br 682±68 mb was in good agreement with the KADoNiS v1.0 recommended value. By contrast, the value of 293±29 mb for
$${}^{81}$$
Br was substantially higher than that of the evaluated database and the KADoNiS v1.0 recommended value.
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 g phase was increased gradually with increasing 316SS, and dislocation caused by the deformation could be migrated and annihilated within the region of g 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 g phase surrounded by a 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. & COPY; 2023 The Author(s). Published by Elsevier B.V. This is an open access article under the CC
摘要：
The effective capture of radioactive iodine vapor is crucial for radiation safety during spent fuel reprocessing. However, current materials used for iodine vapor capture have limitations such as low adsorption efficiency and poor stability, which hinder the effectiveness. To address this issue, an efficient, stable, recoverable and heterogeneous MOF-on-MOF [NH2-MIL-101-on-NH2-UiO-66] adsorbent was prepared using the epitaxial growth strategy. The adsorbent was extensively characterized with various technologies including FT-IR, XPS and XRD, and batch experiments were conducted to evaluate the performance in iodine gas adsorption. Results showed that the adsorption capacity of NH2-MIL-101-on-NH2-UiO-66 reached 1930 mg/g at 80 degrees C and ambient pressure, outperforming the parent MOFs, with a 20-33% higher adsorption rate and a 1.52-2.74 times higher adsorption capacity. Notably, the adsorbent exhibited superior performance compared to commercial silver-exchanged zeolite and other MOFs adsorbents. The excellent adsorption performance of this adsorbent can be attributed to its abundant adsorption sites and well-defined pore structure. Additionally, the adsorbent displayed good thermal stability, withstanding temperatures up to 360celcius. Overall, this study provides a highly effective material for iodine vapor adsorption and contributes to the understanding of novel MOF-on-MOF architectures and the applications.
摘要：
A series of Ce-doping nanograin Gd2CexHf2-xO7 (0.0 <= x <= 2.0) ceramic samples as nuclear waste forms were prepared, and their microstructure, phase evolution, and aqueous durability were systematically studied. The results revealed that the original Gd2Hf2O7 sample comprised a single pyrochlore structure after sintering at 1673 K, but all the Gd2CexHf2-xO7 (0.5 <= x <= 2.0) samples assumed defective fluorite structures with Ce-doping. As the xCe value increased from 0.0 to 2.0, the average grain size of the samples gradually increased from 162 nm to 599 nm, whereas the relative density (measured density/theoretical density) of the samples gradually increased from 91.12% to 93.93%. The normalized release rates of Ce element in the Gd2Ce2O7 sample after 42 days were slightly lower than those of Hf element in the Gd2Hf2O7 sample owing to the lower porosity of the Gd2Ce2O7 sample, and the bond dissociation energy of Ce-O (similar to 795 kJ/mol) was slightly higher than that of Hf-O (similar to 791 kJ/mol). Moreover, the normalized release rates of all considered elements were lower than 10(-5) g m(-2) d(-1), indicating that the samples had excellent chemical stability.
摘要：
Heat exchangers in natural circulation LBE-cooled fast reactors are used in harsh conditions such as extreme temperatures, significant pressure differences, high density, and corrosive environments. Therefore, heat transfer tube rupture and flow blockage accidents are common and result in an asymmetric heat load or asymmetric resistance thereby significantly impacting the safe and stable operation of the reactor. In this study, SNCLFR-10 has been used as the reference reactor and FLUENT simulation is used to establish the LBE-cooled dual-loop natural circulation system. Consequently, a theoretical solution of the natural circulation flow of a dual-loop system (TSNCD) is deduced using dimensionless analysis. The TSNCD theoretical solution is verified by using a dual-loop natural circulation system established via FLUENT simulation. Subsequently disturbance characteristics of the natural circulation system under different heat load differences or resistance differences are analyzed. The characteristic parameters representing the anti-disturbance capacity of natural circulation are determined using fitting approximation, and the best anti-disturbance interval is obtained. The results show that the TSNCD theoretical calculation formula of dual-loop natural circulation flow is extremely reliable, and the error between the calculations and the FLUENT simulation result is less than 5 %. When an asymmetric heat load disturbance and asymmetric resistance disturbance are incorporated into the system together or alone, the loop flow changes insignificantly in a certain interval; the anti-disturbance capacity of the system is strong in this interval. The resistance of the system to heat load disturbance is 0.2 < k(1) < 0.8, and the resistance disturbance is 0.6 < B < 4.8. When an asymmetric heat load and asymmetric resistance disturbance are simultaneously introduced into the system, an optimal resistance disturbance is achieved (k(1) is an element of[0.40, 0.60] and B is an element of[0.7, 2.9]).
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：
large signals;SPE;20-inch MCP-PMT;LSP;LSP parameter
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.
作者：
Yang, Tao;Zhao, Pengcheng*;Zhao, Yanan;Yu, Tao
期刊：
Nuclear Engineering and Technology,2023年55(8):2835-2843 ISSN：1738-5733
通讯作者：
Zhao, Pengcheng;Yu, T
作者机构：
[Yang, Tao; Yu, Tao; Zhao, Pengcheng; Zhao, Yanan] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.;[Yang, Tao; Zhao, Yanan; Zhao, Pengcheng; Yu, Tao] Univ South China, Hunan Engn & Technol Res Ctr Virtual Nucl Reactor, Hengyang 421001, Peoples R China.
通讯机构：
[Yu, T ; Zhao, PC] U;Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.
关键词：
Lead -bismuth fast reactor;Upper plenum;Thermal stratification;Computational fluid dynamics;Proper orthogonal decomposition;Galerkin projection
摘要：
After an emergency shutdown of a lead-bismuth fast reactor, thermal stratification occurs in the upper Plenum, which negatively impacts the integrity of the reactor structure and the residual heat removal capacity of natural circulation flow. The research on thermal stratification of reactors has mainly been conducted using an experimental method, a system program, and computational fluid dynamics (CFD). However, the equipment required for the experimental method is expensive, accuracy of the system program is unpredictable, and resources and time required for the CFD approach are extensive. To overcome the defects of thermal stratification analysis, a high-precision full-order thermal stratification model based on CFD technology is prepared in this study. Furthermore, a reduced-order model has been developed by combining proper orthogonal decomposition (POD) with Galerkin projection. A compar-ative analysis of thermal stratification with the proposed full-order model reveals that the reduced-order thermal stratification model can well simulate the temperature distribution in the upper plenum and rapidly elucidate the thermal stratification interface characteristics during the lead-bismuth fast reactor accident. Overall, this study provides an analytical tool for determining the thermal stratification mechanism and reducing thermal stratification.& COPY; 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/).
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
期刊：
Separation and Purification Technology,2023年305:122499 ISSN：1383-5866
通讯作者：
Shunyan Ning
作者机构：
[Fujita, Toyohisa; Chen, Yedan; Li, Zenguan; Zhong, Yilai] Guangxi Univ, Sch Resources Environm & Mat, Guangxi Key Lab Proc Nonferrous Met & Featured Mat, MOE,Key Lab New Proc Technol Nonferrous Met & Mat, Nanning 530004, Peoples R China.;[Wang, Ji; Ning, Shunyan; Wei, Yuezhou; Yin, Xiangbiao; Chen, Lifeng] Univ South China, Sch Nucl Sci & Technol, 28 Changsheng West Rd, Hengyang 421001, Peoples R China.;[Wei, Yuezhou] Shanghai Jiao Tong Univ Shanghai, Sch Nucl Sci & Engn, Shanghai 200240, Peoples R China.
通讯机构：
[Shunyan Ning] S;School of Nuclear Science and Technology, University of South China, 28 Changsheng West Road, Hengyang 421001, PR China
关键词：
TODGA;Sc;Zr;Adsorption;Separation
摘要：
As the similar properties of Sc and Zr, their mutual separation is difficult and Zr is one of the main impurity elements in high purity Sc2O3 which should be strictly controlled. A novel porous functionalized extraction resin TODGA/SiO2-P was synthesized for selective separation of Zr(IV) from Sc(III). The morphology and structure of the resin were profiled by SEM-EDS, BET and TG-DSC. The results of batch experiments showed that the resin had a better affinity for Zr(IV) than Sc(III) with SFZr/Sc of 25 in 6 M HNO3. Excellent separation of Sc(III) and Zr(IV) can be achieved by chromatography column experiment that more than 99% of Zr(IV) could be removed from the Sc2O3 leaching solution. The results show TODGA/SiO2-P has significant potential for separation of Zr from Sc to produce high purity scandium. In addition, the metal cation binding to the ether-oxygen and amide bonds on the ligand was revealed by FT-IR, XPS, NMR and DFT calculation. The binding of each metal cation to three TODGA ligands was determined by liquid–liquid extraction experiments. The trefoi-shaped ion clusters formed with metal ions and nitrate during extraction using diglycolamide ligands were proved by DFT simulation, which provided a new insight for the ligand chemistry of Sc and Zr.
作者：
Zhao, Mengjie;Salih, Khalid A. M.;Wei, Yuezhou;Guibal, Eric;Ning, Shunyan;...
期刊：
Chemical Engineering Journal,2023年477:147010 ISSN：1385-8947
通讯作者：
Hamza, MF;Guibal, E
作者机构：
[Ning, Shunyan; Wei, Yuezhou; Hamza, Mohammed F.; Hamza, MF; Zhao, Mengjie] Univ South China, Sch Nucl Sci & Technol, Heng Yang 421001, Peoples R China.;[Salih, Khalid A. M.] Cent South Univ, Sch Met & Environm, Changsha 410083, Peoples R China.;[Wei, Yuezhou] Shanghai Jiao Tong Univ, Sch Nucl Sci & Engn, Shanghai, Peoples R China.;[Guibal, Eric; Guibal, E] Polymers Compos & Hybrids PCH, IMT Mines Ales, Ales, France.;[Goda, Adel E. -S.] Tanta Higher Inst Engn & Technol, Tanta 31739, Egypt.
通讯机构：
[Hamza, MF ] U;[Guibal, E ] P;Univ South China, Sch Nucl Sci & Technol, Heng Yang 421001, Peoples R China.;Polymers Compos & Hybrids PCH, IMT Mines Ales, Ales, France.;Nucl Mat Author, POB 530, Cairo, Egypt.
关键词：
Silver sorption promoted by the high content of;N-and S-ligands (in functionalized;mesoporous silica beads) at near neutral pH;Sorption isotherms described by the Temkin;equation and uptake kinetics by the pseudo-first order equation;Endothermic and spontaneous silver sorption;enhanced by ultrasonic treatment;Readily desorption of silver using nitric acid;solution and remarkable sorption properties at;reuse;Outstanding preference for silver from;multicomponent synthetic solutions and;leachates of X-ray films
摘要：
The reaction of thiocarbazide with pentaerythritol tetrakis(3-mercaptopropionate) in the presence of mesoporous silica beads allows producing a composite sorbent (PTMF-SiO2) with high affinity for silver. The high density of both N- and S-based reactive groups (about 5 mmol g(-1)) explains sorption capacities as high as 3 mmol Ag g(-1) at pH 6. The sorption mechanisms are correlated to the pH effect, and to FTIR and XPS spectroscopic analyses. The sorption is endothermic and spontaneous, and the sorption isotherms are successfully modeled using the Temkin equation. Uptake kinetics are fitted by the pseudo-first order rate equation: the equilibrium is reached in 20-30 min. Ultrasonic treatment allows slightly increasing both kinetics (apparent rate coefficient k(1) is almost doubled) and sorption capacities (by less than 7 %). Silver (being a soft acid) preferentially reacts with soft bases; this may explain the selective removal of Ag(I) by PTMF-SiO2 against base metals and alkali or alkaline earth metals (in multicomponent equimolar solutions). The sorbent shows remarkable recycling stability (for at least 5 cycles): complete desorption is achieved in approximate to 20 min with 0.3 M HNO3 solution and the loss in sorption does not exceed 2.5 % at the fifth recycling. Finally, the sorbent is successfully applied to silver recovery from acidic leachates of spent X-ray films (from different hospitals from Hengyang, China), as a case study. Silver is selectively recovered with high efficiency (>96 %) (together with Cu(II), to a lesser extent).
期刊：
International Journal of Applied Ceramic Technology,2023年20(3):1740-1752 ISSN：1546-542X
通讯作者：
Chen, P.;Li, Y.
作者机构：
[He, Ling; Xiao, Peng; Pan, Ling; Li, Yang] Cent South Univ, State Key Lab Powder Met, Changsha, Peoples R China.;[Chen, Pengju] Univ South China, Sch Nucl Sci & Technol, Hengyang, Peoples R China.;[Zhou, Wei] Hunan Univ Technol, Coll Met & Mat Engn, Zhuzhou, Peoples R China.;[Chen, Pengju; Li, Yang] Cent South Univ, Powder Met Res Inst, 932 Yuelu Ave,Lushan South Rd, Changsha 410083, Peoples R China.
通讯机构：
[Li, Y.] S;[Chen, P.] P;Powder Metallurgy Research Institute, No.932 Yuelu Avenue, Lushan South road, China;State Key Laboratory of Powder Metallurgy, China
摘要：
The mullite and ytterbium disilicate (beta-Yb2Si2O7) powders as starting materials for the Yb2Si2O7/mullite/SiC tri-layer coating are synthesized by a sol-gel method. The effect of SiC whiskers on the anti-oxidation properties of Yb2Si2O7/mullite/SiC tri-layer coating for C/SiC composites in the air environment is deeply studied. Results show that the formation temperature and complete transition temperature of mullite were 800-1000 and 1300 & DEG;C, respectively. Yb2SiO5, alpha-Yb2Si2O7, and beta-Yb2Si2O7 were gradually formed between 800 and 1000?, and Yb2SiO5 and alpha-Yb2Si2O7 were completely transformed into beta-Yb2Si2O7 at a temperature above 1200 & DEG;C. The weight loss of Yb2Si2O7/(SiCw-mullite)/SiC tri-layer coating coated specimens was 0.15 x 10(-3) g cm(-2) after 200 h oxidation at 1400?, which is lower than that of Yb2Si2O7/mullite/SiC tri-layer coating (2.84 x 10(-3) g cm(-2)). The SiC whiskers in mullite middle coating can not only alleviate the coefficient of thermal expansion difference between mullite middle coating and beta-Yb2Si2O7 outer coating, but also improve the self-healing performance of the mullite middle coating owing to the self-healing aluminosilicate glass phase formed by the reaction between SiO2 (oxidation of SiC whiskers) and mullite particles.
作者机构：
[Yu Jipan; Zhao Zhengjia; Shi Weiqun] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.;[Liu Kang; Yu Jipan; Zhao Zhengjia; Guo Yan; Shi Weiqun] Chinese Acad Sci, Inst High Energy Phys, Lab Nucl Energy Chem, Beijing 100049, Peoples R China.
通讯机构：
[Yu, JP; Shi, WQ ] U;Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.;Chinese Acad Sci, Inst High Energy Phys, Lab Nucl Energy Chem, Beijing 100049, Peoples R China.
期刊：
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY,2023年145(22):12206-12213 ISSN：0002-7863
通讯作者：
Zhang, FX
作者机构：
[Li, Jiangnan; Fan, Wenjun; Zhang, Fuxiang; Mehmood, Rashid; Zhang, Yashi] Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis iChEM, Dalian Natl Lab Clean Energy, Dalian 116023, Liaoning, Peoples R China.;[Li, Jiangnan; Mehmood, Rashid; Zhang, Yashi] Univ Chinese Acad Sci, Ctr Mat Sci & Optoelect Engn, Beijing 100049, Peoples R China.;[Zhou, Zhen; Hu, Xu] Nankai Univ, Inst New Energy Mat Chem, Renewable Energy Convers & Storage Ctr ReCast, Sch Mat Sci & Engn,Minist Educ, Tianjin 300350, Peoples R China.;[Liu, Peijia; Wang, Junhu] Chinese Acad Sci, Dalian Inst Chem Phys, Ctr Adv Mossbauer Spect, Moossbauer Effect Data Ctr, Dalian 116023, Liaoning, Peoples R China.;[Liu, Min] Univ South China, Coll Nucl Sci & Technol, Hengyang 421001, Peoples R China.
通讯机构：
[Zhang, FX ] C;Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis iChEM, Dalian Natl Lab Clean Energy, Dalian 116023, Liaoning, Peoples R China.
摘要：
Iron (Fe)-based bimetallic oxides/hydroxides have been widely investigated for promising alkaline electrochemical oxygen evolution reactions (OERs), but it still remains argumentative whether Fe(3+) or Fe(4+) intermediates are highly active for efficient OER. Here, we rationally designed and prepared one Fe, V-based bimetallic composite nanosheet by employing the OER-inert V element as a promoter to completely avoid the argument of real active metals and using our recently developed one-dimensional conductive nickel phosphide (NP) as a support. The as-obtained hierarchical nanocomposite (denoted as FeVO(x)/NP) was evaluated as a model catalyst to gain insight into the iron-based species as highly active OER sites by performing in situ X-ray absorption spectroscopy and (57)Fe Mössbauer spectroscopy measurements. It was found that the high-valent Fe(4+) species can only be detected during the OER process of the FeVO(x)/NP nanocomposite instead of the iron counterpart itself. Together with the fact that the OER activities of both the vanadium and iron counterparts are by far worse than that of the FeVO(x)/NP composite, we can confirm that the high-valent Fe(4+) formed are the highly active species for efficient OER. As demonstrated by density functional theory simulations, the composite of Fe and V metals is proposed to cause a decreased Gibbs free energy as well as theoretical overpotential of water oxidation with respect to its counterparts, as is responsible for its excellent OER performance with extremely low OER overpotential (290 mV at 500 mA cm(-2)) and extraordinary stability (1000 h at 100 mA cm(-2)).
期刊：
Chemical Engineering Journal,2023年478:147425 ISSN：1385-8947
通讯作者：
Zhu, JL;Ning, SY
作者机构：
[Zhu, Yongzheng; Zhu, Jinliang; Wu, Wangzhi; Ma, Xiangying; Zhu, JL; Wang, Nannan; Zhu, Yanqiu; Huang, Guo; Hu, Fengtao; Shen, Pei Kang] Guangxi Univ, Coll Chem & Chem Engn, Sch Resources Environm & Mat, State Key Lab Featured Met Mat & Life Cycle Safety, Nanning 530004, Peoples R China.;[Ning, Shunyan; Hu, Fengtao] Univ South China, Sch Nucl Sci & Technol, 28 Changsheng West Rd, Hengyang 421001, Peoples R China.
通讯机构：
[Ning, SY ] U;[Zhu, JL ] G;Guangxi Univ, Coll Chem & Chem Engn, Sch Resources Environm & Mat, State Key Lab Featured Met Mat & Life Cycle Safety, Nanning 530004, Peoples R China.;Univ South China, Sch Nucl Sci & Technol, 28 Changsheng West Rd, Hengyang 421001, Peoples R China.
摘要：
Hydrogen evolution and oxidation are critical to realizing hydrogen energy recycling and to the hydrogen economy. Therefore, it is important to develop non-precious metal catalysts with high efficiency and stability for the hydrogen evolution reaction (HER) and hydrogen oxidation reaction (HOR). In this study, we reported on the facile synthesis of Co2P-Fe2P heterogeneous nanoparticles on a porous carbon skeleton (Co2P-Fe2P/C), which exhibited high activity for both HOR and HER in alkaline conditions. The overpotential of Co2P-Fe2P/C toward HER was 77 mV at 10 mA cm-2, with a Tafel slope of 42 mV dec- 1 and excellent stability under long-term testing after 120 h. The current density at 0.1 V for HOR was 1.68 mA cm-2, which was close to that of commercial Pt/C. In situ Raman spectroscopy indicated that surface reconstruction was involved for Co2P-Fe2P/C, CoFe2O4, and FeOOH, as detected during HOR. Density functional theory calculations revealed strong electron interaction between Fe2P and Co2P at the heterogeneous interfaces, resulting in an optimal hydrogen adsorption strength for HER. This study significantly contributes to the realization of low-cost and high-efficiency bifunctional catalysts for HER and HOR.
摘要：
The synergistic effect between transition metal active centers and the generation of multiple removal pathways has a significant impact on the catalytic activation efficiency of peroxymonosulfate. In this work, a kind of composite catalyst was prepared by growing VCo-metal-organic frameworks (VCo-MOF) in-situ on the surface of Ti3C2Tx by a solvothermal method. The morphology and structure are char-acterized by Transmission Electron Microscope (TEM), Energy Dispersion Spectrum (EDS), Atomic Force Microscope (AFM), etc. Response surface methodology was used to optimize the experimental conditions. Only 5 mg catalyst can be used to effectively activate PMS and remove 96.14 % ciprofloxacin (CIP, 20 mg/ L) within 30 min. The removal effect of catalyst on CIP in different actual water environment was explored. In addition, the fluorescence spectrum test also verified the effective removal of ciprofloxacin. V-Co-Ti ternary system provides a wealth of active sites for CIP removal. Cyclic voltammetry (CV) and lear sweep voltammetry (LSV) tests showed the existence of the electron transfer pathway. The results of density functional theory (DFT) calculation show that VCo-MOF@ Ti3C2Tx has excellent adsorption and activation ability for PMS. At the same time, the hydrophilicity of the catalyst makes PMS more inclined to react with water molecules, which promotes the formation of a unique superoxide radical path. (C) 2022 Elsevier Inc. All rights reserved.
作者机构：
[Luo, Song; Li, Xiao-Hua; Qi, Lin-Jing; Zhang, Dong-Meng; Gui, Hai-Feng] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.;[He, Biao] Cent South Univ, Coll Phys & Elect, Changsha 410083, Peoples R China.;[Wu, Xi-Jun] Univ South China, Sch Math & Phys, Hengyang 421001, Peoples R China.;[Li, Xiao-Hua] Univ South China, Cooperat Innovat Ctr Nucl Fuel Cycle Technol & Equ, Hengyang 421001, Peoples R China.;[Li, Xiao-Hua] Univ South China, Natl Exemplary Base Int Sci & Technol, Collaborat Nucl Energy & Nucl Safety, Hengyang 421001, Peoples R China.
通讯机构：
[He, B ] C;Cent South Univ, Coll Phys & Elect, Changsha 410083, Peoples R China.
摘要：
In the present work, we systematically study the spectroscopic factor of proton radioactivity (Sp) with A > 100 using the deformed two-potential approach (D-TPA). It is found that there is a link between the quadrupole deformation parameter of proton emitter and Sp. Based on this result, we propose a simple analytic formula for estimating the spectroscopic factor of proton radioactivity. With the help of this formula, the calculated half-lives of proton radioactivity can reproduce the experimental data successfully within a factor of 2.77. Furthermore, we extend the D-TPA with this formula for evaluating the spectroscopic factor to predict the proton radioactivity half-lives of 12 proton radioactivity candidates whose radioactivity is energetically allowed or observed but not yet quantified in NUBASE2020. For comparison, the universal decay law for proton radioactivity (UDLP) and the new Geiger-Nuttall law (NG-N) are also used. It turns out that all of the predicted results are basically consistent with each other.
摘要：
The intrinsic brittleness and low bonding strength of SiC-ZrC coatings to the graphite severely limit the ablation performance. Herein, SiC nanowires (SiCnw) were introduced between pre-oxidized graphite and coatings. The brittleness of coatings was reduced and the bonding strength was increased from 5.49 & PLUSMN; 0.88 MPa to 8.33 & PLUSMN; 0.65 MPa by SiCnw. Both simulation and experimental results show SiCnw also worked as thermal conduction channels to improve the ablation resistance. After plasma ablation for 120 s, the ablation rates of SiCnw/SiC-ZrC coated graphite were 0.315 mg/s and 0.217 & mu;m/s, respectively, which are much lower than those of pure graphite and SiC-ZrC coated graphite.
作者：
Dai, Jiaona;Wang, Hui;Xu, Yuchao;Chen, Xiyang;Tian, Rong
期刊：
Seminars in Cancer Biology,2023年91:124-142 ISSN：1044-579X
通讯作者：
Xiyang Chen<&wdkj&>Rong Tian
作者机构：
[Wang, Hui; Tian, Rong; Dai, Jiaona] Sichuan Univ, West China Hosp, Dept Nucl Med, Chengdu 610041, Peoples R China.;[Xu, Yuchao] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.;[Chen, Xiyang] Sichuan Univ, West China Hosp, Dept Gen Surg, Div Vasc Surg, Chengdu 610041, Peoples R China.
通讯机构：
[Xiyang Chen; Rong Tian] D;Department of Nuclear Medicine, West China Hospital, Sichuan University, Chengdu 610041, China<&wdkj&>Division of Vascular Surgery, Department of General Surgery, West China Hospital, Sichuan University, Chengdu 610041, China
摘要：
Based on the advantages of revealing the functional status and molecular expression of tumor cells, positron emission tomography (PET) imaging has been performed in numerous types of malignant diseases for diagnosis and monitoring. However, insufficient image quality, the lack of a convincing evaluation tool and intra- and interobserver variation in human work are well-known limitations of nuclear medicine imaging and restrict its clinical application. Artificial intelligence (AI) has gained increasing interest in the field of medical imaging due to its powerful information collection and interpretation ability. The combination of AI and PET imaging potentially provides great assistance to physicians managing patients. Radiomics, an important branch of AI applied in medical imaging, can extract hundreds of abstract mathematical features of images for further analysis. In this review, an overview of the applications of AI in PET imaging is provided, focusing on image enhancement, tumor detection, response and prognosis prediction and correlation analyses with pathology or specific gene mutations in several types of tumors. Our aim is to describe recent clinical applications of AI-based PET imaging in malignant diseases and to focus on the description of possible future developments.
期刊：
Journal of Superconductivity and Novel Magnetism,2023年:1-6 ISSN：1557-1939
通讯作者：
Liu, M
作者机构：
[Shen, Jiyu; Liu, Min; Zhou, Kexuan; Wu, Zhongjin; Gao, Kaiyang; Lu, Zeyi] Univ South China, Coll Nucl Sci & Technol, Hengyang 421001, Peoples R China.;[Hu, Guochen] Kunming Univ Sci & Technol, Fac Met & Energy Engn, Kunming 650093, 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：
[Liu, M ] U;Univ South China, Coll Nucl Sci & Technol, Hengyang 421001, Peoples R China.;Zhuhai Tsinghua Univ, Res Inst Innovat Ctr, 101 Univ Ave, Tangjiawan Zhuhai 519000, Peoples R China.
关键词：
Prussian blue analogs;Light induced;Charge transfer;Magnetic properties
摘要：
In this paper, we irradiated K0.4Co1.3[Fe(CN)(6)]<middle dot>nH(2)O with infrared light ([KCoFePBA](IIP)) during the preparation process and compared them with normal preparations ([KCoFePBA](NP)). XRD results show that the samples conform to the Fm-3 m space group, and the lattice constants are 10.230 & Aring; ([KCoFePBA](NP)) and 10.225 & Aring; ([KCoFePBA](IIP)), respectively. According to the results of M & ouml;ssbauer spectroscopy, due to the induction of infrared light during the preparation process, part of the electrons are transferred from Co2+ to Fe3+, the paramagnetic Fe3+ (S = 1/2)-CN-Co2+ (S = 3/2) changes to the diamagnetic Fe2+ (S = 0)-CN-Co3+ (S = 0) by charge transfer. The magnetization measurement shows that the magnetization of [KCoFePBA](IIP) is significantly less than that of [KCoFePBA](NP). At 300 K, the theoretical magnetic moments of [KCoFePBA](NP) and [KCoFePBA](IIP) are 4.60 mu (B) and 4.37 mu (B), respectively. The difference in magnetism can be attributed to the charge transfer caused by infrared irradiation during the preparation process.
