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Achieving a remarkable low-temperature tensile ductility in a high-strength tungsten alloy

Tungsten 2024年第1期6卷 150-161页

作者： Xiang Cheng Zhuo-Ming Xie Xue-Feng Xie Long-Fei Zeng Rui Liu Jun-Feng Yang Xue-Bang Wu Xian-Ping Wang Chang-Song Liu Qiang-Feng Fang Key Laboratory of Materials Physics Institute of Solid State PhysicsHFIPSChinese Academy of SciencesHefei 230031China University of Science and Technology of China Hefei 230026China Faculty of Materials Metallurgy and Chemistry Jiangxi University of Science and TechnologyGanzhou 341000China

Hot-swaging yields a high ultimate tensile strength of 712 MPa but a limited tensile ductility with the total elongation of3.6%at a testing temperature of 200℃in a representative W-0.5wt.%ZrC *** this work,the evolution of Vickers microhardness with annealing temperatures is investigated in detail,which contributes to a rough index chart to guide the search for an optimized post-annealing *** the post-annealing around 1300℃,an outstanding tensile ductility at200℃,including a uniform elongation of 14%and a total elongation of~25%,has been achieved without the sacrifice of its *** evolution of dislocations and grain structures with the annealing temperatures accessed through backscattered scanning electron microscope and transmission electron microscope analysis reveals that the improved low-temperature tensile ductility has resulted from the reduction of residual dislocations and dislocation tanglement via the static recovery,which provides more room to accommodate dislocations,and hence stronger strain hardening ability and tensile ductility.

关键词： Tungsten Low-temperature ductility Annealing Dislocations

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Stark Tuning of Telecom Single-Photon Emitters Based on a Single Er^(3+)

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Chinese physics Letters 2023年第7期40卷 1-5页

作者： Jian-Yin Huang Peng-Jun Liang Liang Zheng Pei-Yun Li You-Zhi Ma Duan-Chen Liu Jing-Hui Xie Zong-Quan Zhou Chuan-Feng Li Guang-Can Guo CAS Key Laboratory of Quantum Information University of Science and Technology of ChinaHefei 230026China CAS Center for Excellence in Quantum Information and Quantum Physics University of Science and Technology of ChinaHefei 230026China Hefei National Laboratory University of Science and Technology of ChinaHefei 230088China

The implementation of scalable quantum networks requires photons at the telecom band and long-lived spin *** single Er^(3+) in solid-state hosts is an important candidate that fulfills these critical requirements ***,to entangle distant Er^(3+) ions through photonic connections,the emission frequency of individual Er^(3+) in solid-state matrix must be the same,which is challenging because the emission frequency of Er^(3+) depends on its local ***,we propose and experimentally demonstrate the Stark tuning of the emission frequency of a single Er^(3+) in a Y_(2)SiO_(5) crystal by employing electrodes interfaced with a silicon photonic crystal *** obtain a Stark shift of 182.9±0.8 MHz,which is approximately 27 times of the optical emission linewidth,demonstrating promising applications in tuning the emission frequency of independent Er^(3+) into the same spectral *** results provide a useful solution for construction of scalable quantum networks based on single Er^(3+) and a universal tool for tuning emission of individual rare-earth ions.

关键词： tuning Stark networks

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Suppression of the m/n=2/1 tearing mode by electron cyclotron resonance heating on J-TEXT

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Plasma science and technology 2024年第8期26卷 8-17页

作者：方建港陈忠勇严伟王能超毛飞越罗蔷玄子健陈曦璇任正康张峰黄梅夏冬辉杨州军陈志鹏丁永华 the J-TEXT Team State Key Laboratory of Advanced Electromagnetic Technology International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma PhysicsSchool of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074People’s Republic of China Southwestern Institute of Physics Chengdu 610041People’s Republic of China

Stabilization of tearing modes and neoclassical tearing modes is of great importance for tokamak *** cyclotron waves(ECWs)have been extensively used to stabilize the tearing modes with the virtue of highly localized power *** suppression of the m/n=2/1 tearing mode(TM)by electron cyclotron resonance heating(ECRH)has been achieved successfully on the J-TEXT *** effects of ECW deposition location and power amplitude on the 2/1 TM suppression have been *** is found that the suppression is more effective when the ECW power is deposited closer to the rational *** the ECW power increases to approximately 230 k W,the 2/1 TM can be completely *** island rotation frequency is increased when the island width is *** experimental results show that the local heating inside the magnetic island and the resulting temperature perturbation increase at the O-point of the island play dominant roles in TM *** the ECW power increases,the 2/1 island is suppressed to smaller island width,and the flow shear also plays a stabilizing effect on small magnetic *** the stabilizing contribution of heating and flow shear,the 2/1 TM can be completely suppressed.

关键词： tearing mode electron cyclotron resonant heating tearing mode suppression

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A FINITE DIFFERENCE METHOD FOR TWO DIMENSIONAL ELLIPTIC INTERFACE PROBLEMS WITH IMPERFECT CONTACT

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Journal of Computational Mathematics 2024年第5期42卷 1328-1355页

作者： Fujun Cao Dongfang Yuan Dongxu Jia Guangwei Yuan School of Science Inner Mongolia University of Science and TechnologyBaotou 014010Inner MongoliaChina School of Science Tianjin University of TechnologyTianjin 300384China Laboratory of Computational Physics Institute of Applied Physics and Computational MathematicsP.O.Box 8009Beijing 100088China

In this paper two dimensional elliptic interface problem with imperfect contact is considered,which is featured by the implicit jump condition imposed on the imperfect contact interface,and the jumping quantity of the unknown is related to the flux across the interface.A finite difference method is constructed for the 2D elliptic interface problems with straight and curve interface ***,the stability and convergence analysis are given for the constructed ***,in particular case,it is proved to be *** examples for elliptic interface problems with straight and curve interface shapes are tested to verify the performance of the *** numerical results demonstrate that it obtains approximately second-order accuracy for elliptic interface equations with implicit jump condition.

关键词： Finite difference method Elliptic interface problem Imperfect contact

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Spin-glass behavior in the competing CoCrGaO_(4)cubic spinel system

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Nano Research 2025年第1期18卷 501-507页

作者： Jiyu Hu Jiangli Ni Zhenfa Zi Chaocheng Liu School of Physics and Materials Engineering Hefei Normal UniversityHefei 230009China National Synchrotron Radiation Laboratory University of Science and Technology of ChinaHefei 230026China

Spin glasses(SGs),generally defined as disordered systems with randomized competing interactions,are widely investigated complex *** the ground states of spin glasses is crucial for understanding the nature of disordered magnets and many other physical manifestations,while also helping to solve some hard combinatorial optimization problems across multiple ***,the intrinsic cause of SG has always been elusive,especially in spinel oxide ***,we report the SG behavior observed in the cubic spinel oxides CoCrGaO_(4),and provide a comprehensive understanding of its intrinsic *** results indicate a frustrated state under multi-magnetic competition,and the features of SG are confirmed by susceptibility *** fitting parameters ofτ0,T0,and zv of isothermal remanent magnetization further reveal the relaxation behavior and strong spin ***,the varying exchange coupling under different temperatures and magnetic fields is unveiled,which should be responsible for the disordered *** studies unravel the underlying mechanism responsible for doping-induced magnetic frustration and introduce CoCrGaO_(4)as a potential platform for investigating spin glass behavior,thereby advancing fundamental research on frustrated magnetism within the spinel system.

关键词： spin glass(SG) magnetic frustration magnetic competition spinel ferrites

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Determining the tilt of the Raman laser beam using an optical method for atom gravimeters

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Chinese physics B 2024年第12期33卷 264-268页

作者： Hua-Qing Luo Yao-Yao Xu Jia-Feng Cui Xiao-Bing Deng Min-Kang Zhou Xiao-Chun Duan Zhong-Kun Hu MOE Key Laboratory of Fundamental Physical Quantities Measurement&Hubei Key Laboratory of Gravitation and Quantum Physics PGMF and School of PhysicsHuazhong University of Science and TechnologyWuhan 430074China Oak Ridge National Laboratory TennesseeUSA

The tilt of a Raman laser beam is a major systematic error in precision gravity measurement using atom *** conventional approach to evaluating this tilt error involves modulating the direction of the Raman laser beam and conducting time-consuming gravity measurements to identify the error *** this work,we demonstrate a method to expediently determine the tilt of the Raman laser beam by transforming the tilt angle measurement into characterization of parallelism,which integrates the optical method of aligning the laser direction,commonly used in freely falling corner-cube gravimeters,into an atom gravimeter.A position-sensing detector(PSD)is utilized to quantitatively characterize the parallelism between the test beam and the reference beam,thus measuring the tilt precisely and *** carefully positioning the PSD and calibrating the relationship between the distance measured by the PSD and the tilt angle measured by the tiltmeter,we achieved a statistical uncertainty of less than 30μrad in the tilt ***,we compared the results obtained through this optical method with those from the conventional tilt modulation method for gravity *** comparison validates that our optical method can achieve tilt determination with an accuracy level of better than 200μrad,corresponding to a systematic error of 20μGal in g *** work has practical implications for real-world applications of atom gravimeters.

关键词： atom interferometer absolute gravimeter precision measurement tilt of Raman laser

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Safe formation control of multiple unmanned aerial vehicles:control design and safety-stability analysis

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Control Theory and technology 2024年第3期22卷 442-454页

作者： Haoqi Li Jiangping Hu Qingrui Zhou Bijoy K.Ghosh School of Automation Engineering University of Electronic Science and Technology of ChinaChengdu 611731SichuanChina Yangtze Delta Region Institute(Huzhou) University of Electronic Science and Technology of ChinaHuzhou 313000ZhejiangChina Qian Xuesen Laboratory of Space Technology China Academy of Space TechnologyBeijing 100094China Department of Mathematics and Statistics Texas Tech UniversityLubbockTX 79409-1042USA

Both safety and stability are primary performance criteria for multi-unmanned aerial vehicle(multi-UAV)systems in many coordination *** approaches often consider safety and stability *** is necessary and urgent to develop a safety-stability control strategy to merge these two performance *** this paper,a unified approach is developed to consider safety and stability for multi-UAV formation *** stability criterion is represented by a Lyapunov function and safety criterion is represented by a barrier function and then a relaxed converse control Lyapunov-barrier theorem is *** the help of a relaxed converse control Lyapunov-barrier function(RCCLBF),a distributed safety-stability formation control strategy is proposed for the multi-UAV *** transforming the solution of RCCLBF to a Lyapunovlike stabilization problem,we show that the proposed formation control strategy can drive the UAVs staying within a specified safe *** results are provided to validate the proposed safety-stability formation control strategy.

关键词： Multi-UAV system Formation control Lyapunov function Barrier function Stability with safety guarantee

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Exploring superionic conduction in lithium oxyhalide solid electrolytes considering composition and structural factors

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npj Computational Materials 2024年第1期10卷 1705-1717页

作者： Fiaz Hussain Jinlong Zhu Yusheng Zhao Wei Xia Ningbo Key Laboratory of All-Solid-State Battery Eastern Institute for Advanced StudyEastern Institute of TechnologyNingboZhejiang315201China Department of Physics Southern University of Science and TechnologyShenzhen518055China

Lithium(Li)oxyhalides have emerged as promising solid electrolyte candidates for all-solid-state batteries(ASSBs)due to their superior ionic conductivity and excellent cathode ***,the mechanism of Li transport in oxyhalides has remained unclear due to the complex nature of these compounds,which often comprise multiple phases such as crystalline and amorphous structures.

关键词： conduction lithium solid

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Study of nucleus orientation effect in the ^(238)U+^(238)U multinucleon transfer reaction

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Communications in Theoretical physics 2024年第12期76卷 83-92页

作者： Xin-Rui Zhang Hong Yao Cheng Li Tao Li Yong-Xu Yang Feng-Shou Zhang Department of Physics Guangxi Normal UniversityGuilin 541004China Guangxi Key Laboratory of Nuclear Physics and Technology Guangxi Normal UniversityGuilin 541004China School of Physics Beihang UniversityBeijing 102206China The Key Laboratory of Beam Technology and Material Modification of Ministry of Education School of Physics and AstronomyBeijing Normal UniversityBeijing 100875China Institute of Radiation Technology Beijing Academy of Science and TechnologyBeijing 100875China Center of Theoretical Nuclear Physics National Laboratory of Heavy Ion Accelerator of LanzhouLanzhou 730000China

The improved quantum molecular dynamics model was employed to study the ^(238)U+^(238)U multinucleon transfer reaction at E_(c.m.)=833 Me V in this *** influence of the orientation effect on the nuclear deformation at the contact moment,the composite system lifetime,the transfer rate and the fragment production mechanism are *** analysis reveals that at the contact moment,the orientation of the projectile and the target have less influence on each other and retain their respective initial characteristics to some *** collision parameters less than 6 fm,significant differences are observed in composite system lifetime and transfer rate under different orientation configurations;however,the orientation effect gradually diminishes with increasing collision ***,it is found that transfer reactions dominate when the collision parameter b≤6 fm,while elastic and inelastic scattering events increase rapidly as the collision parameter exceeds 6 *** the range of 10≤b≤13 fm,the transfer probability for side–side collisions is significantly higher compared to other cases.

关键词： the ImQMD model multinucleon transfer reaction orientation effect

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Machine learning for online control of particle accelerators

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science China(physics,Mechanics & Astronomy) 2025年第2期68卷 94-104页

作者： Xiaolong Chen Zhijun Wang Yuan He Hong Zhao Chunguang Su Shuhui Liu Weilong Chen Xiaoying Zhao Xin Qi Kunxiang Sun Chao Jin Yimeng Chu Hongwei Zhao Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China School of Nuclear Science and Technology Lanzhou UniversityLanzhou 730000China School of Nuclear Science and Technology University of Chinese Academy of SciencesBeijing 100049China Advanced Energy Science and Technonlogy Guangdong Laboratory Huizhou 516000China Department of Physics Xiamen UniversityXiamen 361005China

Particle accelerators play a critical role in modern scientific ***,existing manual beam control methods heavily rely on experienced operators,leading to significant time consumption and potential challenges in managing next-generation accelerators characterized by higher beam current and stronger nonlinear *** this paper,we establish a dynamical foundation for designing the online adaptive controller of accelerators using machine *** provides a guarantee for dynamic controllability for a class of scientific instruments whose dynamics are described by spatial-temporal equations of motion but only part variables along the instruments under steady states are *** necessity of using historical time series of beam diagnostic data is *** strategies involve also employing a well-established virtual beamline of accelerators,by which various beam calibration scenarios that actual accelerators may encounter are *** the reinforcement learning algorithm is adopted to train the controller with the interaction to the virtual ***,the controller is seamlessly transitioned to real ion accelerators,enabling efficient online adaptive control and ***,the controller demonstrates significant robustness,effectively managing beams with diverse charge mass ratios without requiring *** a controller allows us to achieve the global control within the entire superconducting section of the China Accelerator Facility for Superheavy Elements.

关键词： nonlinear complex system adaptive control machine learning particle accelerator simulation to reality

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