摘要：
The optimal minimum ECCD power is evaluated numerically for completely suppressing the 3/2 and 2/1 NTMs in the CFETR hybrid scenario. For two typical frequencies of ECCD sources launching from two upper launcher (UL) ports, fec = 210 GHz and 240 GHz with O1-mode, UL1: (Ri, Zi) = (8.47, 5.7) m and UL2: (Ri, Zi) = (8.2, 4.5) m, higher frequency of ECCD source launching from the UL2 port is better than that low frequency counterpart from the UL1 port. Using 240 GHz ECCD source launching from the UL2 port, the minimum power required to fully suppress the two NTMs with precise ECCD alignment is 12.4 MW and 16.7 MW, respectively. When good alignment cannot be achieved, the results suggest that the misalignment should not exceed 0.02a, preferably 0.015a, corresponding to 4.4 cm and 3.3 cm. Considering engineering difficulty of high-frequency gyrotron sources, the optimal minimum ECCD power with the 210 GHz source launching from the UL2 port is 17.9 MW and 20.6 MW for completely suppressing the 3/2 and 2/1 NTMs, respectively. In view of this, it is a good choice to select the 210 GHz ECCD source launching from the UL2 port in the short and medium term.& 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/).
摘要：
A nanograin (Gd2Hf2O7, GHO) ceramic is prepared using a sol-gel and cold-pressing sintering method as a potential curing matrix material for the high-level radioactive waste (HLW). The microstructure, phase evolution, Raman spectra and aqueous durability of the nanograin GHO samples are comprehensively studied. Results show that the sintered powder of the GHO ceramic undergoes a transition from defective fluorite to a pyrochlore structure in the process of increasing the sintering temperature from 1273 to 1673 K. As the pressing pressure increases from 5 to 30 MPa, the density of the GHO sample increased from 7.25 to 8.25 g cm-3, and the corresponding open porosity decreases from 7.61 to 3.95%. XRD, Raman, and microstructure analysis confirmed that the GHO sample pressed at 30 MPa and sintered after 1673 K exhibits a typical nanograin pyrochlore structure with an average grain size of 167 nm. The normalized release rates of Gd and Hf elements in the optimized GHO sample after 42 days are 6.7 x 10-6 g m- 2 d-1 and 7.9 x 10-7 g m- 2 d-1, respectively, which exhibited good aqueous durability. The results can provide an alternative candidate for the development of HLW curing matrix material with enhanced environmental stability.
作者机构：
[Lu, Zhendong; Luo, Xiao-Qing; Liu, Qin-Ke; Luo, XQ; Zhou, Yaojie; Wang, Xin-Lin] Univ South China, Sch Elect Engn, Hengyang 421001, Peoples R China.;[Li, Yan] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.;[Liu, W. M.] Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China.;[Wang, Xin-Lin] Univ South China, Sch Mech Engn, Hunan Prov Key Lab Ultrafast Micro Nano Technol &, Hengyang 421001, Peoples R China.
通讯机构：
[Luo, XQ ] U;Univ South China, Sch Elect Engn, Hengyang 421001, Peoples R China.
摘要：
Chiral metasurfaces, with appealing properties for studying light-matter interactions at the nanoscale, have emerged as a promising platform for the realization of chiral optical responses, thereby showing advantages in chirality-related applications. The conventional approaches primarily concentrate on circular dichroism and the high Q factor of the chiral resonances, while little attention has been paid to the aspects of flexibility and controllability in the modulation of optical chirality, further inhibiting the implementation of tunable and multifunctional chiral metadevices. Here, we employ a planar chiral silicon metasurface governed by bound states in the continuum (BICs) to unravel steerable chiral optical responses. In particular, the BIC-based intrinsic and extrinsic planar chiralities can be precisely steered by breaking the in-plane symmetry and the illumination symmetry, respectively. Moreover, a hybrid Si−VO2 metasurface, manifested by the chiral coupled-mode theory, showcases the feasibility of actively tuning the dissipative loss while maintaining chiral quasi-BICs, then yielding desired loss-steered optical chirality. Our results provide alternative insights into tunable optical chirality and pave the way for advancements in chiroptical applications.
期刊：
Journal of Power Sources,2023年563:232845 ISSN：0378-7753
通讯作者：
Youbin Wang
作者机构：
[Feng, Jiqiang; Wang, Xinpeng; Xin, Yanchen; Wang, Youbin; Zhang, Zhongkang] Guangxi Univ, Sch Resources Environm & Mat, Nanning 530004, Peoples R China.;[Feng, Jiqiang; Wang, Xinpeng; Xin, Yanchen; Wang, Youbin; Zhang, Zhongkang] Guangxi Univ, State Key Lab Featured Met Mat & Life cycle Safety, Nanning 530004, Peoples R China.;[Wei, Xiaofeng] Guangxi Sci & Technol Econ Dev Ctr Co LTD, Nanning 530004, Peoples R China.;[Wei, Yuezhou] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.
通讯机构：
[Youbin Wang] S;School of Resources, Environment and Materials, Guangxi University, Nanning, 530004, China<&wdkj&>State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures, Guangxi University, Nanning, 530004, China
关键词：
Al-air battery;2N Al;Addition Mn;Corrosion;Output voltage
摘要：
As the anode material of Al air battery, 2N-purity (99 wt%) Al-based alloy has the disadvantages of low efficiency and low discharge voltage, which is attributed to the impurity of Fe in the 2N Al alloy. In this paper, the 2N Al -based anode with high energy efficiency and discharge voltage is successfully designed by adding Mn, Zn and Ga. The results show that adding Mn separately can inhibit hydrogen evolution corrosion but lead to the exfoliation corrosion of 2N Al. The addition of Ga, Mn and Zn together can suppress hydrogen evolution, decrease the weight loss of 2N Al alloy and significantly increase the output voltage and energy efficiency of an Al-air battery, which makes it possible to use cheap 2N Al as the anode of an Al-air battery.
通讯机构：
[Chunlin He] S;School of Resources, Environment and Materials, Guangxi University, Nanning, China<&wdkj&>Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured Materials, Nanning, China<&wdkj&>Education Department of Guangxi Zhuang Autonomous Region, Key Laboratory of New Low-carbon Green Chemical Technology, Nanning, China
摘要：
To effectively separate and recover Co(II) from the leachate of spent lithium-ion battery cathodes, we investigated solvent extraction with quaternary ammonium salt N263 in the sodium nitrite system. NO
2
−
combines with Co(II) to form an anion [Co(NO2)3]−, and it is then extracted by N263. The extraction of Co(II) is related to the concentration of NO
2
−
. The extraction efficiency of Co(II) reaches the maximum of 99.16%, while the extraction efficiencies of Ni(II), Mn(II), and Li(I) are 9.27%–9.80% under the following conditions: 30vol% of N263 and 15vol% of iso-propyl alcohol in sulfonated kerosene, the volume ratio of the aqueous-to-organic phase is 2:1, the extraction time is 30 min, and 1 M sodium nitrite in 0.1 M HNO3. The theoretical stages require for the Co(II) extraction are performed in the McCabe—Thiele diagram, and the extraction efficiency of Co(II) reaches more than 99.00% after three-stage counter-current extraction with Co(II) concentration of 2544 mg/L. When the HCl concentration is 1.5 M, the volume ratio of the aqueous-to-organic phase is 1:1, the back-extraction efficiency of Co(II) achieves 91.41%. After five extraction and back-extraction cycles, the Co(II) extraction efficiency can still reach 93.89%. The Co(II) extraction efficiency in the actual leaching solution reaches 100%.
作者：
Zhang, Chunyuan;Chen, Pengyu;Jiang, Fangling;Xie, Jinsen;Yu, Tao
期刊：
Energies,2023年16(6):2934- ISSN：1996-1073
通讯作者：
Xie, J.;Yu, T.
作者机构：
[Chen, Pengyu; Zhang, Chunyuan; Xie, Jinsen; Yu, Tao] Univ South China, Sch Nucl Sci & Technol, Hengyang 421000, Peoples R China.;[Chen, Pengyu; Zhang, Chunyuan; Xie, Jinsen; Yu, Tao] Univ South China, Res Ctr Digital Nucl Reactor Engn & Technol Hunan, Hengyang 421000, Peoples R China.;[Jiang, Fangling] Univ South China, Coll Comp Sci, Hengyang 421000, Peoples R China.
通讯机构：
[Jinsen Xie; Tao Yu] A;Authors to whom correspondence should be addressed.<&wdkj&>School of Nuclear Science and Technology, University of South China, Hengyang 421000, China<&wdkj&>Research Center for Digital Nuclear Reactor Engineering and Technology of Hunan Province, University of South China, Hengyang 421000, China
作者机构：
[Zhu, De-Xing; Luo, Song; Li, Xiao-Hua; Xu, Yang-Yang; Qi, Lin-Jing; Zhang, Dong-Meng] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.;[Li, Xiao-Hua] Univ South China, Natl Exemplary Base Int Sci & Tech Collaborat Nucl, 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] Hunan Normal Univ, Key Lab Low Dimens Quantum Struct & Quantum Contro, Changsha 410081, Peoples R China.
通讯机构：
[Xiao-Hua Li] S;School of Nuclear Science and Technology, University of South China, Hengyang, China<&wdkj&>National Exemplary Base for International Sci & Tech. Collaboration of Nuclear Energy and Nuclear Safety, University of South China, Hengyang, China<&wdkj&>Cooperative Innovation Center for Nuclear Fuel Cycle Technology & Equipment, University of South China, Hengyang, China<&wdkj&>Key Laboratory of Low Dimensional Quantum Structures and Quantum Control, Hunan Normal University, Changsha, China
摘要：
In this study, based on a two-potential approach, we systematically investigated the proton radioactivity half-lives of spherical proton emitters with 69≤Z≤81 from the ground and/or isomeric state, choosing the nuclear potential to be a modified Woods–Saxon potential that contains the isospin effect of the daughter nucleus. It was found that the calculated half-lives could reproduce the experimental data well. Furthermore, we extended this model to predict the half-lives of 17 protonemitting candidates whose radioactivity is energetically allowed or observed but not yet quantified in NUBASE2020. For comparison, the unified fission model, Coulomb potential and proximity potential model, universal decay law for proton emission, and new Geiger–Nuttall law were also used. All the predicted results are consistent with each other.
作者机构：
[Zhu, De-Xing; Li, Xiao-Hua; Xu, Yang-Yang; Hu, Xiao-Yuan] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.;[Wu, Xi-Jun] Univ South China, Sch Math & Phys, Hengyang 421001, Peoples R China.;[Chu, Peng-Cheng] Qingdao Univ Technol, Res Ctr Theoret Phys, Sci Sch, Qingdao 266033, 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.;[Li, Xiao-Hua] Univ South China, Cooperat Innovat Ctr Nucl Fuel Cycle Technol & Equ, Hengyang 421001, Peoples R China.
通讯机构：
[Xiao-Hua Li] S;School of Nuclear Science and Technology, University of South China, Hengyang, China<&wdkj&>National Exemplary Base for International Science and Technology. Collaboration of Nuclear Energy and Nuclear Safety, University of South China, Hengyang, China<&wdkj&>Cooperative Innovation Center for Nuclear Fuel Cycle Technology and Equipment, University of South China, Hengyang, China<&wdkj&>Key Laboratory of Low Dimensional Quantum Structures and Quantum Control, Hunan Normal University, Changsha, China
关键词：
Proton radioactivity;Gamow model;Half-lives
摘要：
In the present study, on the basis of the screened electrostatic effect of the Coulomb potential, we propose an improved Gamow model within the centrifugal potential in which there are only two adjustable parameters, i.e., the screened parameters t and g, which represent the combined effect of the interaction potential and reduced mass of the emitted proton-daughter nucleus on the half-life of proton radioactivity in the overlapping region. Using this model, we systematically calculated the proton radioactivity half-lives of 31 spherical nuclei and 13 deformed nuclei and obtained corresponding root-mean-square deviations of 0.274 and 0.367, respectively. The relationship between the proton radioactivity half-life of
$$^{177}$$
Tl
$$^{\mathrm{m}}$$
and the corresponding angular momentum l removed by the emitted proton is also discussed. In addition, we used the proposed model to predict the proton radioactivity half-lives of 18 nuclei whose proton radioactivity is energetically allowed or observed but not yet quantified in NUBASE2020. For comparison, we used the universal decay law of proton radioactivity proposed by Qi et al. (Phys Rev C 85:011303, 2012.
https://doi.org/10.1103/PhysRevC.85.011303
), and the new Geiger–Nuttall law of proton radioactivity proposed by Chen et al. (Eur Phys J 55:214, 2019.
https://doi.org/10.1140/epja/i2019-12927-7
).
摘要：
To improve the utilisation of uranium resources while reducing the radioactive contamination of uranium slag by Ra-226, the effects of various factors on uranium-radium co-leaching from uranium ore were investigated. For nitric acid agitation leaching, the optimal performance was achieved using 80 mesh ore in 4 mol L-1 nitric acid at 40 degrees C for 4 h with a liquid-to-solid ratio of 3. Under these conditions, the uranium leaching rate was > 99% and the radium leaching rate was > 93% with standard deviations of < 0.04% and < 0.7%, respectively. Thus, this approach realises simultaneous uranium and radium leaching at high rates.
作者：
Chen, X.;Hu, C. Y.;Qu, G. P.;Zheng, B.;Zhang, H. J.
期刊：
Journal of Instrumentation,2023年18(3):P03002 ISSN：1748-0221
作者机构：
[Hu, C. Y.; Zheng, B.; Qu, G. P.; Zhang, H. J.; Chen, X.] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.
关键词：
Detector modelling and simulations I (interaction of radiation with matter, interaction of photons with matter, interaction of hadrons with matter, etc);Modular electronics;Models and simulations
摘要：
To reduce the lower detection limit of N-13 gas, we design a gamma-gamma coincidence measuring instrument including two detectors, a sampling vessel, and a summation and coincidence circuit in this work. The detector uses a 13 cm x 5 cm oversized Bi4Ge3O12 (BGO) scintillator and 172 silicon photomultiplier (SiPM) tubes, which greatly reduce the instrument size while improving the coincidence detection efficiency. The N-13 gas coincidence detection efficiency is improved by installing a multilayer metal absorber plate inside the cylindrical sampling vessel. Due to the short half-life of N-13 gas, it cannot be stored for a long time; additionally, it is difficult to obtain. It is not possible to directly scale the coincidence detection efficiency of this instrument using a N-13 gas source with known activity in engineering projects. Based on the spatial distribution of the relative efficiency of the sampling vessel and the absolute efficiency of the reference point, we use a combination of Na-22 solid point source experiments and Monte Carlo simulations to calculate the coincidence detection efficiency of this instrument for N-13 gas in this work; the coincidence detection efficiency is approximately 4%, which meets the engineering design requirements.
期刊：
Korean Journal of Chemical Engineering,2023年40(1):255-266 ISSN：0256-1115
通讯作者：
Qingliang Wang<&wdkj&>Lechang Xu
作者机构：
[Zhao, Xu] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Hunan, Peoples R China.;[Wang, Hongqiang; Hu, Fang; Su, Yucheng; Wang, Qingliang; Fan, Shiyao; Liu, Xinwei; Hao, Xuanzhang; Hu, Eming; Lei, Zhiwu] Univ South China, Sch Resource Environm & Safety Engn, Hengyang 421001, Hunan, Peoples R China.;[Lei, Zhiwu] East China Univ Technol, State Key Lab Nucl Resources & Environm, Nanchang 330013, Jiangxi, Peoples R China.;[Xu, Lechang] CNNC, Beijing Res Inst Chem Engn & Met, Tongzhou Dist, Beijing 101149, Peoples R China.
通讯机构：
[Qingliang Wang] S;[Lechang Xu] B;School of Resource Environment and Safety Engineering, University of South China, Hengyang, Hunan, China<&wdkj&>Beijing Research Institute of Chemical Engineering and Metallurgy, CNNC, Beijing, China
摘要：
With the wide application of beryllium globally, industrial wastewater has rapidly increased. Previously, adsorption was effective in treating this issue. However, most adsorbents have a poor removal rate, primarily in the low adsorption capacity. To remove Be from industrial wastewater and overcome the disadvantages of low adsorption capacity and poor removal rate of existing adsorbents, typical agricultural waste lotus leaf was used to prepare Al-activated carbon (Al-AC) by the impregnation-calcination modification of Al(NO3)(3). The theoretical maximum adsorption capacity of Al-AC was 32.86 mg/g. Langmuir, Freundlich, and Temkin models were used to thermodynamically analyze Al-AC, and adsorption thermodynamics demonstrated that the adsorption reaction of Al-AC was endothermic. Through characterization analysis, the specific surface area of the modified AC increased from 4.3573 to 155.87 m(2)/g. This study provides a new approach to preparing and modifying AC and a new method for removing Be from industrial wastewater.
摘要：
Solvent-impregnated resins (CA-12/SIRs) have been prepared by using amidoxime resin waste as a polymeric support. The process of gallium (Ga) adsorption onto CA- 12/SIRs from a hydrochloric acid solution was examined in a batch experiment. It was found that CA- 12/SIRs exhibits excellent adsorbent properties with a saturated adsorption capacity of up to 31.2 mg & sdot;g- 1 (318 K). In addition, CA- 12/SIRs showed an outstanding separation ability for Ga(III), with a partition coefficient as high as above 2500 mL & sdot;g- 1. The optimum pH value was found to be 2.75. Moreover, CA- 12/SIRs maintained an excellent adsorption performance for Ga(III), even after ten adsorption-elution cycles. For practical applications, the adsorption percentage of Ga(III) onto CA- 12/ SIRs reached more than 99 % when using hydrochloric acid and sulfuric acid solutions. Thus, a low-cost adsorbent has been developed in the present study by which it is possible to purify gallium. Moreover, this study has provided a new direction for also other types of waste resins in the preparation of impregnated resins.
通讯机构：
[Han, W ] H;Harbin Engn Univ, Coll Mat Sci andChem Engn, Key Lab Superlight Mat & Surface Technol, Minist Educ, Harbin 150001, Peoples R China.
摘要：
To investigate the effect of fission element Ag on the electrochemical recovery of UO2, the electroreduction mechanisms of Ag+ and UO22+ kinetic property of Ag+/Ag couple were first studied on W electrode by different electrochemical techniques. The electrode reactions of Ag+ and UO22+ were found to be one-step and two-step reduction processes, respectively. The exchange current density of Ag+/ Ag couple was estimated to be 0.0431 similar to 0.0727 A cm(-2) in the temperature range of 723 similar to 798 K by LP technique, and its activation energy was evaluated to be 33.91 kJ mol(-1). The deposition products obtained by constant potential electrolysis (CPE) were characterized by XRD and SEM-EDS, which showed the formed Ag and UO2 having pine-branch and micron-scale polyhedral structure, respectively. The influence of Ag+ on the electrochemical behavior of UO22+ and morphology of UO2 were studied. The deposition potential of Ag+ was close to that of UO2+ to UO2. The changes of Ag+ concentration and scan rate had no effect on the electroreduction mechanism of 2 CPE was conducted, and the result indicated that UO2 and Ag could be co-deposited. The deposited Ag could change the morphology of recovered UO2. (c) 2023 The Electrochemical Society ("ECS"). Published on behalf of ECS by IOP Publishing Limited. [DOI: 10.1149/1945-7111/ acf900]
通讯机构：
[Qianhong Huang; Yijun Zhong] S;School of Nuclear Science and Technology, University of South China, Hengyang, People’s Republic of China<&wdkj&>School of Nuclear Science and Technology, University of South China, Hengyang, People’s Republic of China
摘要：
Based on the METIS integrated modeling platform, combined with the experimental data of the #34512 shot detached divertor operation on the HL-2A, this paper selects suitable physical models, and compares and analyzes the integrated modeling results with the experimental results. The modeling results are in good agreement with the experimental results. On this basis, the reason for the decrease of the peak heat flux on the divertor targets is investigated using the METIS simulator. The results show that the two factors of entering the H-mode and the radiation enhancement effect generated by impurity injection work together to reduce the heat flow on the targets. Finally, the different effects of N, Ar and Ne impurity gases on the heat flux reduction of the targets are simulated under the condition that the plasma line-average effective charge (Z(eff)) is kept unchanged. The results show that N and Ar are both better than Ne in controlling the heat flow on the targets, and N has the best compatibility in the core, which can not only reduce the boundary heat flow but also maintain the core confinement performance.
期刊：
Reliability Engineering & System Safety,2023年234:109147 ISSN：0951-8320
通讯作者：
Tao Yu<&wdkj&>Yang Sui
作者机构：
[Ding, Rui; Sui, Yang; Xu, Jintao; Dai, Tao; Zheng, Mengyan; Gui, Maolei; Yu, Tao] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.;[Sui, Yang; Xu, Jintao; Dai, Tao; Zheng, Mengyan; Yu, Tao] Univ South China, Hunan Engn & Technol Res Ctr Virtual Nucl Reactor, Hengyang 421001, Peoples R China.;[Men, Xinhong; Sui, Yang] Fujian Fuqing Nucl Power Co Ltd, Fuqing 350300, Peoples R China.;[Meng, Fanpeng] Hainan Nucl Power Co Ltd, Haikou 572733, Peoples R China.;[Gui, Maolei] Sun Yat Sen Univ, Sino French Inst Nucl Engn & Technol, Zhuhai 519082, Peoples R China.
通讯机构：
[Tao Yu; Yang Sui] S;School of Nuclear Science and Technology, University of South China, Hengyang 421001, China<&wdkj&>Hunan Engineering & Technology Research Center for Virtual Nuclear Reactor, University of South China, Hengyang 421001, China<&wdkj&>School of Nuclear Science and Technology, University of South China, Hengyang 421001, China<&wdkj&>Hunan Engineering & Technology Research Center for Virtual Nuclear Reactor, University of South China, Hengyang 421001, China<&wdkj&>Fujian Fuqing Nuclear Power Co., Ltd, Fuqing 350300, China
摘要：
Traditional static methods are mostly adopted to analyze the reliability of reactor protection system (RPS) for nuclear power plant (NPP). However, they cannot characterize its dynamic interaction, time correlation, and uncertainty. In order to solve this problem, dynamic fault tree (DFT) analysis was firstly utilized to create the DFT for the RPS to characterize its dynamic interaction. Then, dynamic Bayesian network (DBN) was used to create the DBN model based upon the DFT for the RPS to characterize its dynamic interaction, time correlation, and uncertainty. Furthermore, Latin hypercube sampling (LHS) was employed to define a new Bayesian inference algorithm. Finally, the defined algorithm was applied in a RPS for Hualong-1 (HPR1000) in East China to conduct its dynamic prediction and sensitivity analyses through the Bayesian forward and backward inferences, and a new approach for dynamic reliability analysis of the RPS for HPR1000 was proposed. The research results showed that the proposed approach could be used for the dynamic reliability analysis of the RPS.
期刊：
Journal of Instrumentation,2023年18(1):P01019 ISSN：1748-0221
作者机构：
[Song, H.; Yang, C.; Li, X.; Zhang, H.] Northwest Normal Univ, Coll Phys & Elect Engn, 967Anning East Rd, Lanzhou 730070, Peoples R China.;[Zhu, Z.; Yu, B.; Hu, T.] State Key Lab Particle Detect & Elect, 19B Yuquan Rd,Beijing 100049,96,jinzhai Rd, Hefei 230026, Beijing, Peoples R China.;[Zhu, Z.; Yu, B.; Hu, T.] Chinese Acad Sci, Inst High Energy Phys, 19B Yuquan Rd, Beijing 100049, Peoples R China.;[Zhu, Z.; Yu, B.; Hu, T.] Univ Chinese Acad Sci, 19A Yuquan Rd, Beijing 100049, Peoples R China.;[Ling, X.] Univ South China, Sch Nucl Sci & Technol, 28,Changsheng West Rd, Hengyang 421001, Peoples R China.
关键词：
Calorimeters;Electronic detector readout concepts (solid-state);Materials for solid-state detectors;Scintillators;scintillation and light emission processes (solid;gas and liquid scintillators)
摘要：
In this paper, the smaller plastic scintillator (polystyrene as solvent) tiles are polymerized and shaped by two methods, i.e. injection molding technology and thermal pressing technology by domestic manufacturer, to be operated for more than 10 years in the hadron calorimeter of the Circular Electron Position Collider (CEPC) or other purposes. Other benefits include, researching aging problems, by adding 0.1% material antioxidants of 2,6-Di-tert-butyl-4-methylphenol (BHT) and without BHT, and according to Van't Hoff rule of equivalent chemical reaction rate of high temperature, the 10 years aging study is simulated in short term. A strobed coincidence setup is arranged to test the light yield of the tile to be measured with silicon photomultipliers (SiPMs) with ADC read out and a simple trigger system with small solid angle acceptance is adopted. The light yields of measured tiles without BHT decrease by about 26.6% (injection molding technology) and 43.3% (thermal polymerization technology) after ten-year equivalent aging time. Meanwhile, the light yields of the tiles with BHT almost did not change after ten-year equivalent aging time.
摘要：
Separation of gold from wastewater is an efficient approach to recycle the noble metal resources. Polymer-based adsorbents are widely used in separation because they are inexpensive and modifiable. Herein, a novel phos-phonic acid functionalized poly(vinyl chloride) (PVC-APA) nanofiber was fabricated by the functionalization and electrospinning of PVC. PVC-APA exhibited superior adsorption performance for Au with a maximum adsorption capacity of 336.36 mg/g. The adsorption behavior conformed to the pseudo-second-order kinetic model and Langmuir adsorption isotherm, which was a spontaneous and endothermic process. The adsorption affinity be-tween PVC-APA and Au was very strong even under the interference of multiple ions. Moreover, the reusability of PVC-APA was also satisfying. Comprehensive characterizations and comparative experiments revealed that two hydroxyl oxygen atoms in the phosphonic acid group and one nitrogen atom in the amine group can act as a tridentate ligand to chelate with Au. The adsorbed Au(III) ions can be partially reduced to Au0 by amino groups through a redox reaction. This work broadens the application of PVC in the field of precious metal recovery.
摘要：
Fe50Mn30Co10Cr10 high entropy alloy (HEA) can be considered as a candidate structural and functional material, but the early failure during friction with heavy load can limit its more extensive applications. In this paper, a series of tungsten carbide particle reinforced Fe50Mn30Co10Cr10 HEAs were fabricated by laser cladding tech-nique, the influence of tungsten carbide content on microstructure, mechanical properties and tribological be-haviors were explored systematically. The results indicated that the dissolution and diffusion of tungsten carbide could contribute to a wettability between tungsten carbide and HEA matrix, and grain refinement was caused by increasing tungsten carbide. The UTS and EL of the P10 sample are increased by simultaneously by 26.8% and 31.1% compared with UTS of 696 MPa and EL of 15.1% for P5 sample. UTS and EL were enhanced simulta-neously owing to fine-grained strengthening and nanoscale precipitate strengthening. But higher content of tungsten carbide could cause lower elongation owing to the embrittlement of the materials. Just as this, Rockwell hardness and friction coefficient has an increasing trend with increasing tungsten carbide when an opposite trend exists in volume wear rate. It can indicate that hardness is a more important factor for wear resistance, and excellent wear resistance with 1.25 x 10-5 mm3/(N & sdot;m) appear in higher-content WCp reinforced HEA com-posite. Furthermore, wear mechanism is transformed from abrasive wear in low-content tungsten carbide to adhesive wear in high-content tungsten carbide.
