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Effective extraction of photoneutron cross-section distribution using gamma activation and reaction yield ratio method

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Nuclear science and Techniques 2023年第11期34卷 103-111页

作者： Zhi‑Cai Li Yue Yang Zong‑Wei Cao Xin‑Xiang Li Yun Yuan Zong‑Qing Zhao Gong‑Tao Fan Hong‑Wei Wang Wen Luo School of Nuclear Science and Technology University of South ChinaHengyang 421001China Science and Technology on Plasma Physics Laboratory Laser Fusion Research CenterChina Academy of Engineering PhysicsMianyang 621900China Shanghai Advanced Research Institute Chinese Academy of SciencesShanghai 201210China

Photoneutron cross-section(PNCS)data are important in various current and emerging *** a few sophis-ticated methods have been developed,there is still an urgent need to study the PNCS *** this study,we propose the extraction of PNCS distributions using a combination of gamma activation and reaction yield ratio *** verify the validity of the proposed extraction method,experiments for generating^(62,64)Cu and^(85m,87m)Sr isotopes via laser-induced pho-toneutron reactions were performed,and the reaction yields of these isotopes were *** the proposed extraction method,the PNCS distributions of^(63)Cu and^(86)Sr isotopes(leading to^(85m)Sr isotope production)were successfully *** extracted PNCS distributions were benchmarked against available PNCS data or TALYS calculations,demonstrating the validity of the proposed extraction *** applications for predicting the PNCS distributions of the 30 iso-topes are further *** conclude that the proposed extraction method is an effective complement to the available sophisticated methods for measuring and evaluating PNCS data.

关键词： Photonuclear data Photoneutron cross section Gamma activation Reaction yield TALYS calculation

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Plasmon-enhanced ultra-high photoresponse of single-wall carbon nanotube/copper/silicon near-infrared photodetectors

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Nano research 2024年第7期17卷 5930-5936页

作者： Yi-Ming Zhao Xian-Gang Hu Chao Chen Zuo-Hua Wang An-Ping Wu Hong-Wang Zhang Peng-Xiang Hou Chang Liu Hui-Ming Cheng Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China National Engineering Research Center for Equipment and Technology of Cold Strip Rolling College of Mechanical EngineeringYanshan UniversityQinhuangdao 066004China Faculty of Materials Science and Engineering/Institute of Technology for Carbon Neutrality Shenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen 518055China

Single wall carbon nanotube(SWCNT)/Si heterojunction photodetectors have the advantages of high photoresponse ability and simple structure,however,their detection wavelength range are usually lower than 1100 nm,which limits their application in the infrared *** report a SWCNT/Cu/Si photodetector with both a high photoresponse and a detection range up to the infrared band by depositing a Cu nanoparticles(NPs)layer between a SWCNT film and a n-Si *** was found that the Cu NPs produce strong surface plasmon resonance(SPR)under laser irradiation,which breaks through the limitation of Si band gap and greatly improves the photoresponse of the SWCNT/Cu/Si photodetector in the near infrared *** responsivity(R)of the photodetector in the wavelength range of 1850–1200 nm reached 2.2–14.15 mA/W,which is the highest value in the reported plasmon enhanced n-Si based photodetectors,and about 20,000 times higher than that of a SWCNT/Si *** R value for 1550 nm wavelength used in optical communications reached~8.2 mA/W,which is 64%higher than the previously reported values of commonly used *** attribute the significant increase to the strong SPR and low Schottky barrier of Cu with n-Si,which facilitates the generation and transfer of the carriers.

关键词： single wall carbon nanotube photodetector silicon surface plasmon resonance copper

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A high-flash-point quasi-solid polymer electrolyte for stable nickel-rich lithium metal batteries

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Journal of Energy Chemistry 2024年第12期99卷 149-158页

作者： Yu-Kun Liu Xue-Yan Huang Jun-Dong Zhang Wei-Jin Kong Juan Du Ximin Zhai Xiaofe Bie Huanli Sun Hao Zhang Chong Yan Xuechun Hao Lizhen Fan Ai-Bing Chen Chen-Zi Zhao College of Chemical and Pharmaceutical Engineering Hebei University of Science and TechnologyShijiazhuang 050018HebeiChina Tsinghua Center for Green Chemical Engineering Electrification Beijing Key Laboratory of Green Chemical Reaction Engineering and TechnologyDepartment of Chemical EngineeringTsinghua UniversityBeijing 100084China China FAW Corporation Limited Chuangchun 130013JilinChina Beijing Key Laboratory of Advanced Chemical Energy Storage Technologies and Materials Research Institute of Chemical DefenseBejing 100191China Advanced Research Institute of Multidisciplinary Science Beijing Institute of TechnologyBeijing 100081China School of Materials Science and Engineering Beijing Institute of TechnologyBeijing 100081China Shanxi Research Institute for Clean Energy Tsinghua UniversityTaiyuan 030032ShanxiChina Institute of Advanced Materials and Technology University of Science and Technology BeijingBeijing 100083China

In the exploration of next-generation high-energy–density batteries,lithium metal is regarded as an ideal candidate for anode ***,lithium metal batteries (LMBs) face challenges in practical applications due to the risks associated with organic liquid electrolytes,among which their low flash points are one of the major safety *** adoption of high flash point quasi-solid polymer electrolytes(QSPE) that is compatible with the lithium metal anode and high-voltage cathode is therefore a promising strategy for exploring high-performance and high-safety ***,we employed the in-situ polymerization of poly (epoxidized soya fatty acid Bu esters-isooctyl acrylate-ditrimethylolpropane tetraacrylate)(PEID) to gel the liquid electrolyte that formed a PEID-based QSPE (PEID-QSPE).The flash point of PEID-QSPE rises from 25 to 82℃ after gelation,contributing to enhanced safety of the battery at elevated temperatures,whereas the electrochemical window increases to 4.9 ***,the three-dimensional polymer framework of PEID-QSPE is validated to facilitate the uniform growth of the solid electrolyte interphase on the anode,thereby improving the cycling stability of the *** employing PEID-QSPE,the Li|LiNi_(0.9)Co_(0.05)Mn_(0.05)O_(2) cell achieved long-term cycling stability (Coulombic efficiency,99.8%;>200 cycles at 0.1 C) even with a high cathode loading (~5 mg cm^(-2)) and an ultrathin Li(~50μm).This electrolyte is expected to afford inspiring insights for the development of safe and long-term cyclability LMBs.

关键词： Solid-state batteries Lithium metal anodes Quasi-solid polymer electrolytes High flash points Cross-linking polymerization

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Effects of Diamond on the Mechanical Properties and Thermal Conductivity of Si_(3)N_(4)Composites Fabricated Using Spark Plasma Sintering

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Journal of Wuhan University of technology(Materials science) 2024年第5期39卷 1319-1324页

作者： GAO Ying LIU Di WANG Aiyang ZHANG Song HE Qianglong REN Shifeng FANG Jie WANG Zihan WANG Weimin State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Jingdezhen Huaxun Special Ceramics Co.ltd. Jingdezhen 333000China Aerospace Science&Industry Defense Technology Research and Test Center Beijing 100854China

Micrometer-sized diamonds were incorporated into silicon nitride(Si_(3)N_(4))matrix to manufacture high-performance Si_(3)N_(4)-based composites using spark plasma sintering at 1500℃under 50 *** effects of the diamond content on the phase composition,microstructure,mechanical properties and thermal conductivity of the composites were *** results showed that the addition of diamond could effectively improve the hardness of the *** thermal conductivity of Si_(3)N_(4)increased to 52.97 W/m·k at the maximum with the addition of 15 wt%diamond,which was 27.5%higher than that of the monolithic Si_(3)N_(4).At this point,the fracture toughness was 7.54 MPa·m^(1/2).Due to the addition of diamond,the composite material generated a new substance,MgSiN2,which effectively combined Si_(3)N_(4)with ***2 might improve the hardness and thermal conductivity of the materials.

关键词： spark plasma sintering Si_(3)N_(4) diamond thermal conductivity mechanical properties

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Game-based collaborative decision-making training: a framework and behavior analysis for a remote collaborative decision-making skill training game using multidimensional scaffolding

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Universal Access in the Information Society 2025年第1期24卷 867-883页

作者： Kuo, Chih-Chen Hou, Huei-Tse Graduate Institute of Applied Science and Technology National Taiwan University of Science and Technology Address: #43 Keelung Road Sect. 4 Taipei Taiwan Empower Vocational Education Research Center National Taiwan University of Science and Technology Address: #43 Keelung Road Sect. 4 Taipei Taiwan

Decision-making is considered an essential competence of the twenty-first century skills. Remote synchronous collaborative problem-solving has gained much attention especially for decision-making training. We designed a framework to promote decision-making training with a multidimensional scaffolding-based game, and 84 participants were recruited online to evaluate the game based on the proposed framework. The quasi-experimental study compared collaborative and individual learners’ game performance, anxiety, motivation, acceptance, behavior patterns, and perceived learning process for decision-making. The result showed that both collaborative and individual learners had low anxiety, high motivation, and high acceptance in the multidimensional scaffolding-based online educational game;however, the collaborative team had better game performance and found the clues to be more useful for the learning process than the individual team did. Behavioral pattern analysis revealed that the high-performance collaborative team had more well-organized problem-solving and in-depth reflection. © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2024.

关键词： Decision making

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Overcoming side reaction effects in the colloidal synthesis of ZnSe/ZnS core/shell quantum dots with an etching strategy

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Nano research 2024年第8期17卷 7020-7026页

作者： Jinhua He Chenhui Wang Mingrui Liu Muhammad Ramzan Zhiwei Long Xian-gang Wu Yu Chen Haizheng Zhong MIIT Key Laboratory for Low-Dimensional Quantum Structure and Devices School of Materials Science and EngineeringBeijing Institute of TechnologyBeijing 100081China Beijing Engineering Research Center for Mixed Reality and Advanced Display Technology School of Optics and PhotonicsBeijing Institute of TechnologyBeijing 100081China

The potential use of large-size ZnSe quantum dots as blue emitters for display applications has greatly inspired the colloidal ***,we report the negative effects of side reactions of large-size ZnSe quantum *** side reactions between oleic acid and oleylamine generated amidation products and H_(2)O,which led to the hydrolysis of Zn(OA)2 to Zn(OH)2 and the subsequent formation of zinc oxide(ZnO)and zinc bis[diphenylphosphinate](Zn(DPPA)2)*** side reactions resulted in the formation of a defective surface including a Se-rich surface and oxygen-related *** negative effects can be overcome by adopting an etching strategy using potassium fluoride and myristic acid in *** overcoating a ZnS shell,blue emissive ZnSe/ZnS quantum dots with a maximum photoluminescence quantum yield of up to 91%were *** further fabricated ZnSe quantum dots-based blue light-emitting diodes with an emission peak at 456 *** device showed a turn-on voltage of 2.7 V with a maximum external quantum efficiency of 4.2%and a maximum luminance of 1223 cd·m^(−2).

关键词： quantum dots ZnSe side reactions surface etching light-emitting diodes

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Mechanism and control of nonuniform phase transformation of microalloyed dual-phase steel during cooling process after hot rolling

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Journal of Iron and Steel research International 2024年第2期31卷 428-441页

作者： Wen-quan Sun Sheng-yi Yong Tie-heng Yuan Chao Liu San-bao Zhou Rui-chun Guo Meng-xia Tang National Engineering Research Center for Advanced Rolling and Intelligent Manufacturing University of Science and Technology BeijingBeijing100083China Strip Production Plant Xichang Steel and Vanadium Corporation of Pangang GroupXichang615000SichuanChina

After cooling in the hot rolling process,the metallographic structure of microalloyed dual-phase steel is nonuniform along the rolling direction,while the thickness fluctuation of microalloyed dual-phase steel with a nonuniform metallographic structure will occur during cold *** mechanism of nonuniform phase transformation of microalloyed dual-phase steels was studied during the cooling process after hot rolling,and the nonuniform phase transformation of microalloyed dual-phase steel was regulated during the cooling process after hot rolling through process ***,the empirical equation of phase transformation temperature was measured by a dilatometer considering thermal ***,the phase field and temperature field of laminar cooling process were calculated to provide initial boundary conditions for the finite element *** that,the coupling finite element model of the temperature phase transformation of the strip steel in coiling transportation process was *** simulation results show that the different thermal contact conditions of the microalloyed dual-phase steel during coil transportation lead to uneven cooling of the coil,which leads to nonuniform transformation of the coil along the rolling *** addition,by prolonging the time interval from coiling to unloading,the phenomenon of nonuniform phase transformation of microalloyed dual-phase steel can be effectively *** simulation results are applied to industrial *** application results show that prolonging the time interval from coiling to unloading can effectively improve the nonuniform phase transformation of microalloyed dual-phase steel in the cooling process after hot rolling.

关键词： Microalloyed dual-phase steel Thickness fluctuation Cooling Heat conduction Nonuniform phase transition Finite element method

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Pure-blue emissive ZnSe/Cd_(x)Zn_(1-x)S/ZnS quantum dots with type-II core-shell structure for display application

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Nano research 2024年第12期17卷 10476-10482页

作者： Mingrui Liu Chenhui Wang Peng Huang Jinhua He Muhammad Ramzan Haizheng Zhong MIIT Key Laboratory for Low-Dimensional Quantum Structure and Devices School of Materials Science and EngineeringBeijing Institute of TechnologyBeijing 100081China Beijing Engineering Research Center for Mixed Reality and Advanced Display Technology School of Optics and PhotonicsBeijing Institute of TechnologyBeijing 100081China

Blue emissive quantum dots are key materials in fabricating quantum-dot light-emitting diodes for display *** to date,most of the previous blue emissive quantum dots are based on quantum dots with type-I core-shell *** this work,we report pure-blue emissive ZnSe/Cd_(x)Zn_(1-x)S/ZnS quantum dots with type-II core-shell structure,which show high photoluminescence quantum yield over 90%.The type-II structure was investigated by applying time-resolved photoluminescence and transient absorption measurements,illustrating the extended photoluminescence decay lifetime of ZnSe/Cd_(x)Zn_(1-x)S quantum dots as well as the transition of bleaching peak from the valence band of ZnSe to the conduction band of *** further fabricated ZnSe/Cd_(x)Zn_(1-x)S/ZnS quantum dots based electroluminescence devices,achieving a maximum external quantum efficiency of 6.7%and a maximum luminance of 39,766 cd·m^(-2).

关键词： quantum dots blue emitter type-II display core shell

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Blocking thermal runaway propagation in large-format sodium-ion battery system through localized energy release

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Journal of Energy Chemistry 2025年第5期104卷 514-526页

作者： Yongchun Dang Yongchao Yu Zhenpo Wang Peng Liu Xunli Zhou Yongjie Zhao Peipei Qi Fei Xu Lei Li National Engineering Research Center of Electric Vehicles Beijing Co-Innovation Centre for Electric VehiclesBeijing Institute of TechnologyBeijing 100081China Beijing Institute of Technology Chongqing Innovation Center Chongqing 401120China Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications School of Materials Science and EngineeringBeijing Institute of TechnologyBeijing 100081China Research Center of Do-Fluoride New Energy Technology Co. Ltd.Jiaozuo 454003HenanChina

Cascading thermal runaway(TR)propagation poses a critical safety concern for large-format sodium-ion battery(SIB)systems because of the heightened risks of fires or ***,effectively suppressing TR propagation without introducing unintended side effects remains a significant ***,we demonstrate a localized energy release method to mitigate TR,by reducing the state of charge(SOC)of cells adjacent to the thermally runaway *** discover that as the SOCs decreased from 100%to 25%,the TR trigger temperature decreased significantly,and the maximum temperature decrease from 367 to 229℃.Meanwhile,the volume of gas decreased to one-third of its original value,while the range of explosion limits significantly *** analysis of the morphology of the debris further confirms that the structural damage is greater at higher SOC ***,an Entropy Weight and Technique for Order Preference by Similarity to an Ideal Solution(EW-TOPSIS)method has been established to assess the safety status of SIBs,showing that the TR possibility is nearly linear with the SOCs,and the TR hazard is exponentially related to the ***,when the SOC of cells adjacent to the TR cell is reduced to 25%,TR can be directly blocked without the need for additional cooling or thermal insulation *** study not only advances the understanding of TR behavior in SIBs but also offers a straightforward approach to mitigating the TR risk in SIB systems.

关键词： Sodium-ion battery Thermal runaway Safety assessment Localized energy release

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Microstructure and Texture Evolution of Mg‑14Gd‑0.5Zr Alloy during Rolling and Annealing under Diferent Temperatures

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Acta Metallurgica Sinica(English Letters) 2023年第1期36卷 61-76页

作者： Chunxiao Li Hong Yan Rongshi Chen Shi-Changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaHefei 230026China School of Materials Science and Engineering Shandong University of Science and TechnologyQingdao 266590China

Mg alloys containing high rare earth(RE)elements are hard to be rolled due to their low ductility and high strength at low ***,rolling at high temperatures is necessary for these *** this work,a Mg-14Gd-0.5Zr(wt%)alloy was rolled one pass with 40%reduction at high temperatures over 450°*** efects of rolling temperature on the microstructure and dynamic recrystallization behavior were analyzed in detail by the electron backscattered difraction(EBSD)*** results revealed that the alloy shows good rollability at high temperature due to the activity of nonbasal dislocations and ***,dynamic recrystallization is difcult to take place because of the easy activation of multi-slip system and thus more accumulated strain ***,Gd segregation was observed at the grain boundary and it is inferred that the segregation can partially enhance the dynamic recrystallization *** recrystallized grains with large size took place after short-term inter-pass annealing treatment ranging from 450℃to 500°C,and formed basal *** result suggests that the formation of basal texture during short-term annealing treatment was attributed to the growth of dynamic recrystallized grains caused by weakened Gd segregation.

关键词： Magnesium alloys Hot rolling Annealing Recrystallization Mg-Gd-Zr

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