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arXiv 2021年

作者： Zhang, Chun Yu Wang, Kai Si, Ran Godefroid, Michel Jönsson, Per Xiao, Jun Gu, Ming Feng Chen, Chong Yang Shanghai EBIT Lab Key Laboratory of Nuclear Physics and Ion-beam Application Institute of Modern Physics Department of Nuclear Science and Technology Fudan University Shanghai200433 China Hebei Key Lab of Optic-electronic Information and Materials The College of Physics Science and Technology Hebei University Baoding071002 China Université Libre de Bruxelles CP160/09 Brussels1050 Belgium Department of Materials Science and Applied Mathematics Malmö University MalmöSE-20506 Sweden Space Science Laboratory University of California BerkeleyCA94720 United States

Atomic properties of n = 3 states of the W56+- W61+ions are systematically investigated through two state-of-the-art methods, namely, the second-order many-body perturbation theory, and the multiconfiguration Dirac-Hartree-Fock method combined with the relativistic configuration interaction approach. The contributions of valence-valence and core-valence electron correlations, the Breit interaction, the higherorder retardation correction beyond the Breit interaction through the transverse photon interaction, and the quantum electrodynamical corrections to the excitation energies are studied in detail. The excitation energies and wavelengths obtained with the two methods agree with each other within ≈0.01%. The present results achieve spectroscopic accuracy and provide a benchmark test for various applications and other theoretical calculations of W56+-W61+ions. They will assist spectroscopists in their assignment and direct identification of observed lines in complex spectra. © 2021, CC BY.

关键词： Benchmarking

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Parameter constraints on a black hole with Minkowski core through quasiperiodic oscillations

arXiv

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arXiv 2025年

作者： Guo, Ming-Yu Wu, Meng-He Kuang, Xiao-Mei Guo, Hong School of Mathematics Physics and Statistics Shanghai University of Engineering Science Shanghai201620 China Center of Application and Research of Computational Physics Shanghai University of Engineering Science Shanghai201620 China College of Physics and Electronic Information Engineering Neijiang Normal University Neijiang641112 China Center for Gravitation and Cosmology College of Physical Science and Technology Yangzhou University Yangzhou225002 China Escola de Engenharia de Lorena Universidade de São Paulo SP Lorena12602-810 Brazil

We investigate the geodesic motion of charged particles in the vicinity of regular black holes with a Minkowski core, embedded in a uniform magnetic field, and study the influences of magnetic field and regular black hole parameter on the radial effective potential and angular momentum of the particles’ orbits. We perturb the circular orbit and analyze the characteristic frequencies of the epicyclic oscillations, which are closely related with the quasiperiodic oscillations (QPOs) phenomena of the accretion disc surrounding the black hole. Then using the MCMC simulation, we fit our theoretical results with four observational QPOs events (GRO J1655-40, XTE J1550-564, XTE J1859+226, and GRS 1915+105) and provide constraints on the magnetic field strength B, the characteristic radius r, the mass M, and the regular black hole parameter g. In particular, since the parameter g describes the degree of deviation from the classical Schwarzschild black hole, our studies suggest that, within a certain level of confidence, the black holes in the current model can deviate from the classical singularity structure of Schwarzschild black holes, and exhibit quantum corrections near the core. Copyright © 2025, The Authors. All rights reserved.

关键词： Magnetic fields

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Inheritance factor on the physical properties in metallic glasses

材料展望（英文）

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材料展望（英文） 2022年第3期 185-194页

作者： Weiming Yang Jiawei Li Hongyang Li Haishun Liu Jinyong Mo Si Lan Maozhi Li Xun-Li Wang Jürgen Eckert Juntao Huo School of Mechanics and Civil Engineering State Key Laboratory for Geomechanics and Deep Underground EngineeringChina University of Mining and TechnologyXuzhou 221116People's Republic of China CAS Key Laboratory of Magnetic Materials and Devices Zhejiang Province Key Laboratory of Magnetic Materials and Application TechnologyNingbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingboZhejiang 315201People's Republic of China School of Materials and Physics China University of Mining and TechnologyXuzhou 221116People's Republic of China Herbert Gleiter Institute of Nanoscience Nanjing University of Science and Technology200 Xiaolingwei AvenueNanjing 210094People's Republic of China Department of Physics City University of Hong Kong83 Tat Chee AvenueHong KongPeople's Republic of China Department of Physics Beijing Key Laboratory of Opto-electronic Functional Materials and Micro-nano DevicesRenmin University of ChinaBeijing 100872People's Republic of China Department of Physics City University of Hong Kong83 Tat Chee AvenueHong KongPeople's Republic of China Center for Neutron Scattering City University of Hong Kong Shenzhen Research Institute8 Yuexing 1st RoadShenzhen Hi-Tech Industrial ParkShenzhen 518057People's Republic of China Erich Schmid Institute of Materials Science Austrian Academy of Science8700 LeobenAustria Department of Materials Science Chair of Materials PhysicsMontanUniversität Leoben8700 LeobenAustria

Material genetic engineering can significantly accelerate the development of new *** an important topic in material science and condensed matter physics,the development of metallic glasses(MGs)with specific properties has largely been the result of trial and error since their discovery in ***,property design based on the physical parameters of constituent elements of MGs remains a huge challenge owing to the lack of an understanding of the property inheritance from constitute elements to the resultant *** this work,we report the inherent relationships of the yield strength σy,Young's modulus E,and shear Modulus G with the valence electron *** importantly,we reveal that the electronic density of states(EDOSs)at the Fermi surface(EF)is an inheritance factor for the physical properties of *** physical properties of MGs are inherited from the specific element with the largest coefficient of electronic specific heat(γi),which dominates the value of the EDOS at *** work not only contributes to the understanding of property inheritances but also guides the design of novel MGs with specific properties based on material genetic engineering.

关键词： metallic glasses inheritance factor mechanical properties electronic density of state

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A Method for Thermal Resistance Test of Reverse-Conducting IGBT (RC-IGBT)

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IOP Conference Series: Materials science and Engineering 2021年第2期1043卷

作者： Y Chen P Zhang X F Hu H Z Huang P Lai Z Y He Y Q Chen Science and Technology on Reliability Physics and Application of Electronic Component Laboratory The 5th Electronics Research Institute of MIIT Guangzhou China School of Mechanical and Electrical Engineering University of Electronic Science and Technology of China Chengdu China South China University of Technology Guangzhou Guangdong

The RC-IGBT is integrated IGBT and fast recovery diode (FRD) on the same chip. RC-IGBT has smaller size, higher power density, lower cost, and higher reliability. However, due to the snap-back effect, the traditional test circuit and method cannot accurately measure the thermal resistance of RC-IGBT. In this paper, a thermal resistance test circuit based on series compensation of two devices is proposed, and the voltage drop Vec of the body diode is taken as the temperature sensitive parameter of RC-IGBT. The thermal response curve is obtained basing on the change of Vec with temperature. By comparing the traditional method with the new method, it can be seen that the new method can greatly improve the test accuracy.

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Research on the Test Method of Output Hot Standing Wave of High Power TWT

Research on the Test Method of Output Hot Standing Wave of H...

引用

2019 International Vacuum electronics Conference, IVEC 2019

作者： Liu, Xinai Zou, Feng Wang, Gang Miao, Guoxing Song, Fangfang Key Laboratory of Science and Technology on High Power Microwave Sources and Technologies Institute of Electronics Chinese Academic of Sciences Beijing101407 China University of Chinese Academy of Sciences Beijing101407 China Sci. and Technol. Reliability Physics and Application Technology of Electronic Component Laboratory Guangzhou510610 China

ISBN: (纸本)9781538675342

In this paper, the measurement principle of TWT output hot standing wave is analyzed, and the test method of hot standing wave based on vector network analyzer (VNA) is put forward. The feasibility of this method is preliminarily proved by analyzing and comparing the test results of the TWT output cold standing wave, and the output hot standing wave of \mathbf{L} band TWT is measured in saturated and small signal states. © 2019 IEEE.

关键词： Elastic waves

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Nuclear mass table in deformed relativistic Hartree-Bogoliubov theory in continuum: I. even-even nuclei

arXiv

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arXiv 2022年

作者： Zhang, Kaiyuan Cheoun, Myung-Ki Choi, Yong-Beom Chong, Pooi Seong Dong, Jianmin Dong, Zihao Du, Xiaokai Geng, Lisheng Ha, Eunja He, Xiao-Tao Heo, Chan Ho, Meng Chit In, Eun Jin Kim, Seonghyun Kim, Youngman Lee, Chang-Hwan Lee, Jenny Li, Hexuan Li, Zhipan Luo, Tianpeng Meng, Jie Mun, Myeong-Hwan Niu, Zhongming Pan, Cong Papakonstantinou, Panagiota Shang, Xinle Shen, Caiwan Shen, Guofang Sun, Wei Sun, Xiang-Xiang Tam, Chi Kin Thaivayongnou Wang, Chen Wang, Xingzhi Wong, Sau Hei Wu, Jiawei Wu, Xinhui Xia, Xuewei Yan, Yijun Yeung, Ryan Wai-Yen Yiu, To Chung Zhang, Shuangquan Zhang, Wei Zhang, Xiaoyan Zhao, Qiang Zhou, Shan-Gui State Key Laboratory of Nuclear Physics and Technology School of Physics Peking University Beijing100871 China Institute Soongsil University Seoul156-743 Korea Republic of Department of Physics Pusan National University Busan46241 Korea Republic of Department of Physics The University of Hong Kong Pokfulam 999077 Hong Kong Institute of Modern Physics Chinese Academy of Sciences Lanzhou730000 China School of Physics University of Chinese Academy of Sciences Beijing100049 China School of Physics Beihang University Beijing102206 China School of Physics and Microelectronics Zhengzhou University Zhengzhou450001 China Department of General Education for Human Creativity Hoseo University Chungnam Asan336-851 Korea Republic of College of Materials Science and Technology Nanjing University of Aeronautics and Astronautics Nanjing210016 China Center for Exotic Nuclei Studies Institute for Basic Science Daejeon34126 Korea Republic of Department of Energy Science Sungkyunkwan University Suwon16419 Korea Republic of Rare Isotope Science Project Institute for Basic Science Daejeon34000 Korea Republic of School of Physical Science and Technology Southwest University Chongqing400715 China Korea Institute of Science and Technology Information Daejeon34141 Korea Republic of School of Physics and Optoelectronics Engineering Anhui University Hefei230601 China School of Science Huzhou University Huzhou313000 China School of Nuclear Science and Technology University of Chinese Academy of Sciences Beijing100049 China CAS Key Laboratory of Theoretical Physics Institute of Theoretical Physics Chinese Academy of Sciences Beijing100190 China School of Physics and Electronic Engineering Center for Computational Sciences Sichuan Normal University Chengdu610068 China School of Physical Sciences University of Chinese Academy of Sciences Beijing100049 China Center of Theoretical Nuclear Physics National Laboratory of Heavy Ion Accelerator Lanzhou7300

Ground-state properties of even-even nuclei with 8 ≤ Z ≤ 120 from the proton drip line to the neutron drip line have been investigated using the deformed relativistic Hartree-Bogoliubov theory in continuum (DRHBc) with the density functional PC-PK1. With the effects of deformation and continuum included simultaneously, 2583 even-even nuclei are predicted to be bound. The calculated binding energies, two-nucleon separation energies, root-mean-square (rms) radii of neutron, proton, matter, and charge distributions, quadrupole deformations, and neutron and proton Fermi surfaces are tabulated and compared with available experimental data. The rms deviation from the 637 mass data is 1.518 MeV, providing one of the best microscopic descriptions for nuclear masses. The drip lines obtained from DRHBc calculations are compared with other calculations, including the spherical relativistic continuum Hartree-Bogoliubov (RCHB) and triaxial relativistic Hartree-Bogoliubov (TRHB) calculations with PC-PK1. The deformation and continuum effects on the limits of the nuclear landscape are discussed. Possible peninsulas consisting of bound nuclei beyond the two-neutron drip line are predicted. The systematics of the two-nucleon separation energies, two-nucleon gaps, rms radii, quadrupole deformations, potential energy curves, neutron densities, neutron mean-field potentials, and pairing energies in the DRHBc calculations are also discussed. In addition, the α decay energies extracted are in good agreement with available data. Copyright © 2022, The Authors. All rights reserved.

关键词： Neutrons

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Pressure-stabilized unconventional stoichiometric yttrium sulfides

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Physical Review Research 2020年第4期2卷 043435-043435页

作者： Ju Chen Wenwen Cui Kun Gao Jian Hao Jingming Shi Yinwei Li Laboratory of Quantum Functional Materials Design and Application School of Physics and Electronic Engineering Jiangsu Normal University Xuzhou 221116 China Shandong Key Laboratory of Optical Communication Science and Technology School of Physical Science and Information Technology of Liaocheng University Liaocheng 252059 China

Yttrium sulfides are found to exhibit rich phase diagram and diverse properties under pressures. Here, we systematically investigate the stability of binary Y-S system up to 50 GPa using first-principles swarm-intelligence structure search. We identify seven hitherto unknown stoichiometries (Y7S6, Y6S5, Y7S8, Y6S7, Y5S6, Y3S2, and YS3) that are energetically stable with respect to the decomposition into elemental components. All phases exhibit metallic nature, of which YS3 shows potential superconductivity with estimated Tc of 18.5 K at 50 GPa. The Tc in YS3 is comparable to the 17 K superconductivity in elements yttrium (89.3 GPa) and sulfur (160 GPa), but could be achieved at much lower pressure. The high superconductivity is attributed to the high electronic density of states from S atoms at Fermi level. Additionally, Y3S2 is predicted to be a layer-structured magnetic electride with magnetic moment of 0.5 μB per formula unit at 6 GPa, which transforms to a three-dimensional phase with weak superconductivity around 17 GPa.

关键词： electronic structure First-principles calculations Phase transitions Superconductivity

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Spatial single mode laser source interaction with measured pulse based parabolic index multimode fiber

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Journal of Optical Communications 2024年第0期45卷 s465-s473页

作者： Rashed, Ahmed Nabih Zaki Ahammad, S.K. Hasane Daher, Malek G. Sorathiya, Vishal Siddique, Abrar Asaduzzaman, Sayed Rehana, Hasin Dutta, Nitul Patel, Shobhit K. Nyangaresi, Vincent Omollo Jibon, Rayhan Habib Abdelhamid, Huda Said Electronics and Electrical Communications Engineering Department Faculty of Electronic Engineering Menoufia University Menouf32951 Egypt Department of ECE Koneru Lakshmaiah Education Foundation Andhra Pradesh Vaddeswaram522302 India Physics Department Islamic University of Gaza P.O. Box 108 Gaza Palestine Department of Information and Communication Technology Marwadi University Rajkot India Department of Smart Robot Convergence and Application Engineering Pukyong National University Busan48513 Korea Republic of Department of Electrical and Computer Engineering University of Waterloo WaterlooONN2L 3G1 Canada Department of Computer Science and Engineering Rangamati Science and Technology University Rangamati Bangladesh Department of Computer Science and Engineering Daffodil International University Dhaka Bangladesh Computer Sc and Engg. Dept. SRM University Andhra Pradesh Guntur India Electronics and Communication Engg. Department Marwadi University Gujarat Rajkot India Tom Mboya University College P.O. Box 199-40300 Homabay Kenya Electronics and Communication Engineering Discipline Khulna University Khulna9208 Bangladesh

The study clarified spatial single mode laser interaction with measured pulse based parabolic index multimode fiber. Peak power level margin, maximum/minimum signal amplitude margin after parabolic index multimode fiber are measured with core radius of 25 μm, cladding thickness of 10 μm, refractive index peak of 1.4142, length of 300 m, and refractive index step of 1%. Maximum signal power margin against spectral frequency after PIN light detector based parabolic fiber properties is tested under the same operating parameters. The signal power amplitude/power within parabolic index multimode fiber is also measured based on variations of fiber lengths and relative refractive index step. The study implies the multimode graded index fibers with parabolic or near parabolic index profile cores have transmission bandwidths than other multimode fibers. © 2022 Walter de Gruyter GmbH, Berlin/Boston.

关键词： Multimode fibers

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Bimeron clusters in chiral antiferromagnets

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npj Computational Materials 2020年第1期6卷 270-278页

作者： Xiaoguang Li Laichuan Shen Yuhao Bai Junlin Wang Xichao Zhang Jing Xia Motohiko Ezawa Oleg A.Tretiakov Xiaohong Xu Michal Mruczkiewicz Maciej Krawczyk Yongbing Xu Richard F.L.Evans Roy W.C.hantrell Yan Zhou School of Science and Engineering The Chinese University of Hong Kong518172 ShenzhenChina Hefei National Laboratory for Physical Sciences at the Microscale Department of PhysicsUniversity of Science and Technology of China230026 HefeiChina Research Institute of Materials Science of Shanxi Normal University&Collaborative Innovation Center for Shanxi Advanced Permanent Magnetic Materials and Technology 041004 LinfenChina School of Physics and Electronic Information Shanxi Normal University041004 LinfenChina Department of Physics University of YorkYork YO105DDUK York-Nanjing International Center of Spintronics(YNICS) Nanjing University210093 NanjingChina Department of Applied Physics The University of Tokyo7-3-1 HongoTokyo 113-8656Japan School of Physics The University of New South WalesSydney 2052Australia National University of Science and Technology‘MISiS’ Moscow 119049Russia School of Chemistry and Materials Science of Shanxi Normal University&Key Laboratory of Magnetic Molecules and Magnetic Information Materials of Ministry of Education 041004 LinfenChina Institute of Electrical Engineering Slovak Academy of SciencesDúbravskácesta 984104 BratislavaSlovakia Centre for Advanced Materials Application CEMEA Slovak Academy of SciencesDúbravskácesta 5807/984511 BratislavaSlovakia Faculty of Physics Adam Mickiewicz University in PoznanUniwersytetu Poznanskiego 261-614 PoznanPoland

A magnetic bimeron is an in-plane topological counterpart of a magnetic *** the topological equivalence,their statics and dynamics could be distinct,making them attractive from the perspectives of both physics and spintronic *** this work,we demonstrate the stabilization of bimeron solitons and clusters in the antiferromagnetic(AFM)thin film with interfacial Dzyaloshinskii–Moriya interaction(DMI).Bimerons demonstrate high current-driven mobility as generic AFM solitons,while featuring anisotropic and relativistic dynamics excited by currents with in-plane and out-ofplane polarizations,***,these spin textures can absorb other bimeron solitons or clusters along the translational direction to acquire a wide range of Néel topological *** clustering involves the rearrangement of topological structures,and gives rise to remarkable changes in static and dynamical *** merits of AFM bimeron clusters reveal a potential path to unify multibit data creation,transmission,storage,and even topology-based computation within the same material system,and may stimulate spintronic devices enabling innovative paradigms of data manipulations.

关键词： properties topological clusters

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Residual Stress Analysis of Laser Welding Between Output Needle and Helix

引用

Journal of physics: Conference Series 2021年第2期1802卷

作者： Wei Su Wenhao Luo Xianshan Dong Renhuai Liu MOE Key lab of Disaster Forecast and Control in Engineering Guangzhou 510632 China Science and Technology on Reliability Physics and Application Technology of Electronic Component Laboratory China Electronic Product Reliability and Environmental Testing Research Institute Guangzhou 510610 China School of Mechanics and Construction Engineering Jinan University Guangzhou 510632 China

In order to obtain the welding stress of the output needle and helix, a finite element model is established and the mesh at the weld is refined to evaluate the welding residual stress. ANSYS parameter design language is used to simulate the motion load of welding heat source. Based on the exact calculation of the temperature field, the corresponding thermal units are converted into structural units to calculate the welding residual stress. Finally, the thermal stress distribution curve and residual stress distribution trend are obtained after post-treatment.

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