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Simultaneously enhancing erosion and compression resistance:designing AlCoCrFeNi high-entropy alloy strengthened Ag-based contacts

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Rare Metals 2024年第9期43卷 4476-4492页

作者： Xiao-Yang Xue Zhe Wang Hui-Ling Nie Zhao Yuan Jun Wang Chang-Hu Xu Kai Wen Cong-Hao Yu School of Materials Science and Engineering Xi’an Polytechnic UniversityXi’an 710048China School of Physics Xi’an Jiaotong UniversityXi’an 710049China Key Laboratory of Pulsed Power Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China

Designing microstructures and unveiling dynamic erosion mechanisms remain important challenges for Ag-based *** simultaneously enhance erosion and compression resistance,an Al Co Cr Fe Ni high-entropy alloy(HEA)is introduced into Ag-based materials to fabricate novel Ag-HEA contacts with island-and skeletonrestricted *** arc erosion experimental results reveal that the skeleton-restricted HEA microstructure is the key factor in reducing the hill and crater morphologies of the contact surface,effectively delaying material transfer between the movable and stationary *** molten bridge evolution and compressive deformation behavior of Ag-HEA contacts with various microstructures are investigated using molecular dynamics(MD)*** results indicate that the constraint of Ag atom diffusion in the molten pool and the involvement of HEA atoms in the molten bridge are the primary mechanisms for improving erosion *** skeleton-restricted HEA microstructure reduces the total energy and structural stability of the molten bridge system and promotes its fracture and ***,the synergistic effect of the twin and Lomerz–Cottrell lock structures can hinder dislocation glide,generating dispersed and small-area stacking faults in the Ag matrix and mitigating the concentration of shear ***,the skeleton-restricted HEA microstructure contributes positively to compression *** study presents a novel approach to designing Ag-based contacts.

关键词： Electrical contact materials High entropy alloys Arc erosion Molecular dynamics Microstructures

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Elaborating strengthen mechanism of Pt-Ir solid solution superalloy at finite temperature

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Rare Metals 2024年第3期43卷 1243-1256页

作者： Wei Yu Xiao-Yu Chong Yun-Xuan Zhou Meng-Di Gan Ying-Xue Liang Yan Wei Ai-Min Zhang Chang-Yi Hu Xing-Yu Gao Li Chen Hai-Feng Song Jing Feng Faculty of Materials Science and Engineering Kunming University of Science and TechnologyKunming650093China Yunnan Precious Metals Laboratory Co.LTD Kunming650106China Laboratory of Computational Physics Institute of Applied Physics and Computational MathematicsBeijing100088China

Pt-Ir alloy is potential superalloys used above 1300℃because of their high strength and creep ***,the ductility of Pt-Ir alloy has rapidly deteriorated with the increase of Ir,resulting in poor *** work quantitatively evaluated the solid solution strengthening(SSS)and grain refinement strengthening(GRS)of Pt-Ir alloy using first-principles calculations combined with experimental ***,the stretching force constants in the second nearest neighbor region(SFC^(2nd))of pure Ir(193.7 eV·nm^(-2))are 3.40 times that of pure Pt(57.0 eV·nm^(-2)),i.e.,the interatomic interaction is greatly enhanced with the increase of Ir content,which leads to the decrease of ductility,and modulus misfit plays a dominant role in ***,the physical mechanisms responsible for the hardness(H_(V))of Pt-Ir alloy,using the power-law-scaled function of electron work function coupled SSS and GRS,are attributed to the electron redistribution caused by different Ir ***,a thorough assessment of the thermodynamic characteristics of Pt-Ir binary alloy was conducted,culminating in development of a mapping model that effectively relates enmposition,temperature and *** results revealed that the compressive strength incrcases with the Ir content,and the highest strength was observed in Pt_(0.25)Ir_(0.75).This study provides valuable insights into the Pt-Ir alloy system.

关键词： Elastic properties Phonon Solid solution strengthen Force constants CALPHAD

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Interception of Layered LP-N and HLP-N at Ambient Conditions by Confined Template

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Chinese physics Letters 2024年第3期41卷 61-72页

作者：王冬雪付静李义姚震刘爽刘冰冰 State Key Laboratory of Superhard Materials College of PhysicsJilin UniversityChangchun 130012China Basic Science Department Jilin Institute of Architecture and TechnologyChangchun 130000China College of Science Liaoning University of TechnologyJinzhou 121000China

We propose a feasible strategy of intercepting the layered polymeric nitrogen(LP-N)and hexagonal layered polymeric nitrogen(HLP-N)at ambient conditions by using the confinement *** stable mechanism of confined LP-N an... 详细信息

关键词： ambient layered polymeric

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Benchmarking calculations of excitation energies and transition properties with spectroscopic accuracy of highly charged ions used for the fusion plasma and astrophysical plasma

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Chinese physics B 2023年第11期32卷 179-193页

作者：张春雨王凯司然李金晴宋昌仙吴思捷严碧霜陈重阳 Shanghai EBIT Laboratory Key Laboratory of Nuclear Physics and Ion-beam ApplicationInstitute of Modern PhysicsDepartment of Nuclear Science and TechnologyFudan UniversityShanghai 200433China Department of Physics University of StrathclydeGlasgow G40NGUK Department of Physics and Anhui Key Laboratory of Optoelectric Materials Science and Technology Key Laboratory of Functional Molecular SolidsMinistry of EducationAnhui Normal UniversityWuhu 241000China Hebei Key Laboratory of Optic-electronic Information and Materials The College of Physics Science and TechnologyHebei UniversityBaoding 071002China

Atomic radiative data such as excitation energies, transition wavelengths, radiative rates, and level lifetimes with high precision are the essential parameters for the abundance analysis, simulation, and diagnostics in fusion and astrophysical plasmas. In this work, we mainly focus on reviewing our two projects performed in the past decade. One is about the ions with Z■30 that are generally of astrophysical interest, and the other one is about the highly charged krypton(Z = 36)and tungsten(Z = 74) ions that are relevant in research of magnetic confinement fusion. Two different and independent methods, namely, multiconfiguration Dirac–Hartree–Fock(MCDHF) and the relativistic many-body perturbation theory(RMBPT) are usually used in our studies. As a complement/extension to our previous works for highly charged tungsten ions with open M-shell and open N-shell, we also mainly focus on presenting and discussing our complete RMBPT and MCDHF calculations for the excitation energies, wavelengths, electric dipole(E1), magnetic dipole(M1), electric quadrupole(E2), and magnetic quadrupole(M2) transition properties, and level lifetimes for the lowest 148 levels belonging to the 3l3configurations in Al-like W61+. We also summarize the uncertainties of our systematical theoretical calculations, by cross-checking/validating our datasets from our RMBPT and MCDHF calculations, and by detailed comparisons with available accurate observations and other theoretical calculations. The data are openly available in science Data Bank at https://***/10.57760/sciencedb.10569.

关键词： energy levels transition rates highly charged ions relativistic many-body perturbation theory(RMBPT) multi-configuration Dirac-Hartree-Fock(MCDHF) benchmarking calculations exci-tation energies spectroscopic accuracy

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Nonreciprocal generation of Schrodinger cat state induced by topology

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science China(physics,Mechanics & Astronomy) 2024年第4期67卷 23-30页

作者： Zi-Hao Li Li-Li Zheng Ying Wu Xin-You Lü School of Physics and Institute for Quantum Science and Engineering Huazhong University of Science and Technologyand Wuhan Institute of Quantum TechnologyWuhan 430074China Key Laboratory of Optoelectronic Chemical Materials and Devices of Ministry of Education Jianghan UniversityWuhan 430074China

The Schrodinger cat state produced differently in two directions is anticipated to be a critical quantum resource in quantum information *** exploring the interplay between quantum nonreciprocity and topology in a one-dimensional microcavity array,we obtain the Schrodinger cat state(a pure quantum state)in a chosen direction at the edge cavity,whereas a classical state in the other *** nonreciprocal generation of the cat state originates from the topologically protected chiralitymode excitation in the nontrivial phase,but in the trivial phase,the nonreciprocal generation of cat state ***,our proposal is switchable by tuning the parameters so that a topological phase transition ***,the obtained cat state has nonreciprocal high fidelity,nonclassicality,and quantum coherence,which are sufficient to be used in various one-way quantum technologies,e.g.,invisible quantum sensing,noise-tolerant quantum computing,and chiral quantum *** work provides a general approach to control quantum nonreciprocities with the topological effect,which substantially broadens the fields of nonreciprocal photonics and topological physics.

关键词： Schr?dinger cat state nonreciprocity topology

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Vector Segment Routing for Large-Scale Multilayer Satellite Network

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Journal of Communications and Information Networks 2023年第1期8卷 24-36页

作者： Weigang Bai Hongming Yang Jincheng Tong Zhaotao Qin Ruochen Lyu Xidian University Xi’an 710000 Science and Technology on Communication Networks Laboratory Shijiazhuang 050000China China Academy of Space Technology Beijing 100000China

With the expansion of satellite constellation,routing techniques for small-scale satellite networks have problems in routing overhead and forwarding *** paper proposes a vector segment routing method for large-scale multi layer satellite networks.A vector forwarding path is built based on the location between the source and the *** packets are forwarded along this vector path,shielding the influence of satellite motion on routing ***,a dynamic route maintenance strategy is *** a multi layer satellite network,the low-orbit satellites are in charge of computing the routing tables for one area,and the routing paths are dynamically adjusted in the area in accordance with the *** medium-orbit satellites maintain the connectivity of vector paths in multiple segmented *** forwarding mode based on the source and destination location improves the forwarding efficiency,and the segmented route maintenance mode decreases the routing *** simulation results indicate that vector segment routing has significant performance advantages in end-to-end delay,packet loss rate,and throughput in a multi layer satellite *** also simulate the impact of routing table update mechanism on network performance and overhead and give the performance of segmented vector routing in multi layer low-orbit satellite networks.

关键词： routing technique routing overhead vector segment routing network load throughput

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Wearable multichannel-active pressurized pulse sensing platform Yunlong

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Microsystems & Nanoengineering 2024年第3期10卷 283-292页

作者： Zhao Qingxia Sun Shixuan Mei Libo Gao Xikuan Zhang Zekun Yang Xueli Nan Haiyan Zhang Chenyang Xue Junyang Li Pen-Tung Sah Institute of Micro-Nano Science and Technology Xiamen University361102 XiamenChina Discipline of Intelligent Instrument and Equipment Xiamen University361102 XiamenChina Department of Electronic Engineering Ocean University of China266000 QingdaoChina School of Automation and Software Engineering Shanxi University030006 TaiyuanChina Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province(IKKEM) 361005 XiamenChina Key Laboratory of Instrumentation Science and Dynamic Measurement Ministry of Education North University of China030051 TaiyuanChina Science and Technology on Vacuum Technology and Physics Laboratory Lanzhou Institute of PhysicsChinese Academy of Space Technology730000 LanzhouChina

With the modernization of traditional Chinese medicine(TCM),creating devices to digitalize aspects of pulse diagnosis has proved to be *** currently available pulse detection devices usually rely on external pressure devices,which are either bulky or poorly integrated,hindering their practical *** this work,we propose an innovative wearable active pressure three-channel pulse monitoring device based on TCM pulse diagnosis *** combines a flexible pressure sensor array,flexible airbag array,active pressure control unit,advanced machine learning approach,and a companion mobile application for human–computer *** to the high sensitivity(460.1 kPa^(−1)),high linearity(R^(2)>0.999)and flexibility of the flexible pressure sensors,the device can accurately simulate finger pressure to collect pulse waves(Cun,Guan,and Chi)at different external pressures on the *** addition,by measuring the change in pulse wave amplitude at different pressures,an individual’s blood pressure status can be successfully *** enables truly wearable,actively pressurized,continuous wireless dynamic monitoring of wrist pulse *** innovative and integrated design of this pulse monitoring platform could provide a new paradigm for digitizing aspects of TCM and other smart healthcare systems.

关键词： pulse diagnosis enable

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Generalized Kibble-Zurek mechanism for defects formation in trapped ions

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science China(physics,Mechanics & Astronomy) 2023年第8期66卷 20-25页

作者： Wei Wen Shanhua Zhu Yi Xie Baoquan Ou Wei Wu Pingxing Chen Ming Gong Guangcan Guo College of Science Hunan University of TechnologyZhuzhou 412007China Institute for Quantum Science and Technology College of ScienceNational University of Defense TechnologyChangsha 410073China Hefei National Laboratory Hefei 230088China CAS Key Laboratory of Quantum Information University of Science and Technology of ChinaHefei 230026China Synergetic Innovation Center of Quantum Information and Quantum Physics University of Science and Technology of ChinaHefei 230026China

The Kibble-Zurek(KZ)mechanism has played a fundamental role in defect formation with universal scaling laws in nonequilibrium phase ***,this theory may not accurately predict the scaling laws in inhomogeneous systems and slow quenching ***,we present a generalized KZ mechanism for the defect formation in trapped ions with the freeze-out condition gt=b0τ(t),where g is a universal quenching velocity function and b0 is a *** derived a differential equationφ(x,t)to account for the frozen correlation length of a kink in an inhomogeneous system and demonstrated a smooth crossover from a fast quenching process to a slow quenching process,which agrees well with the experiments performed by Ulm et al.[***.4,2290(2013)]and Pyka et al.[***.4,2291(2013)].Furthermore,we confirmed our theoretical model using molecular dynamics simulation by solving the stochastic differential equation,showing excellent agreement with the results from the differential *** theory provides a general theoretical framework for studying KZ physics in inhomogeneous systems,which has applications in other nonequilibrium platforms studied experimentally.

关键词： Kibble-Zurek mechanism trapped ions universal scaling law

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Single crystal growth and electronic structure of Rh-doped Sr_(3)Ir_(2)O_(7)

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Chinese physics B 2023年第8期32卷 86-90页

作者：王冰倩彭舒婷欧志鹏王宇晨 Muhammad Waqas 罗洋魏志远淮琳崴沈建昌缪宇孙秀鹏殷月伟何俊峰 Department of Physics and CAS Key Laboratory of Strongly-coupled Quantum Matter Physics University of Science and Technology of ChinaHefei 230026China

Ruddlesden-Popper iridate Sr_(3)Ir_(2)O_(7)is a spin-orbit coupled Mott *** doped Sr_(3)Ir_(2)O_(7)provides an ideal platform to study the exotic quantum phenomena that occur near the metal-insulator transition(MIT)*** substitution of Ir is an effective method to induce hole doping into Sr_(3)Ir_(2)O_(7).However,the highest doping level reported in Sr_(3)(Ir_(1-x)Rh_(x))_(2)O_(7)single crystals was only around 3%,which is far from the MIT *** this paper,we report the successful growth of single crystals of Sr3(Ir_(1-x)Rh_(x))_(2)O_(7)with a doping level of~9%.The samples have been fully characterized,demonstrating the high quality of the single *** measurements have been carried out,confirming the tendency of MIT in these *** electronic structure has also been examined by angle-resolved photoemission spectroscopy(ARPES)*** results establish a platform to investigate the heavily hole doped Sr_(3)Ir_(2)O_(7) compound,which also provide new insights into the MIT with hole doping in this material system.

关键词： hole doped iridate single crystal growth metal-insulator transition angle-resolved photoemission spectroscopy(ARPES)

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Analysis of gravity wave activity during stratospheric sudden warmings in the northern hemisphere

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Earth and Planetary physics 2024年第2期8卷 415-422页

作者： XuanYun Zeng Guang Zhong School of Physics and Electronic Sciences Changsha University of Science and TechnologyChangsha 410000China Key Laboratory of Geospace Environment Chinese Academy of SciencesUniversity of Science&Technology of ChinaHefei 230026China

Due to the significant changes they bring to high latitude stratospheric temperature and wind,stratospheric sudden warmings(SSWs)can have an impact on the propagation and energy distribution of gravity waves(GWs).The variation characteristics of GWs during SSWs have always been an important *** temperature data from January to March in 2014−2016,provided by the Constellation Observing System for Meteorology,Ionosphere and Climate(COSMIC)mission,we have analyzed global GW activity at 15−40 km in the Northern Hemisphere during SSW *** the SSWs that we studied,the stratospheric temperature rose in one or two longitudinal regions in the Northern Hemisphere;the areas affected extended to the east of 90°*** these SSWs,the potential energy density(E_(p)of GWs expanded and covered a larger range of longitude and altitude,exhibiting an eastward and downward *** E_(p)usually increased,while partially filtered by the eastward zonal *** zonal winds weakened or turned westward,E_(p)began to *** SSWs,the E_(p)usually *** observations can serve as a reference for analyzing the interaction mechanism between SSWs and GWs in future work.

关键词： stratospheric sudden warming gravity wave wind filter

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