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Dynamic adversarial jamming-based reinforcement learning for designing constellations

Digital Communications and Networks 2024年第5期10卷 1471-1479页

作者： Yizhou Xu Haidong Xie Nan Ji Yuanqing Chen Naijin Liu Xueshuang Xiang Qian Xuesen Laboratory of Space Technology China Academy of Space TechnologyBeijingChina The School of Aerospace Engineering Tsinghua UniversityBeijingChina China Academy of Aerospace Science and Innovation BeijingChina

To resist various types of jamming in wireless channels,appropriate constellation modulation is used in wireless communication to ensure a low bit error *** to the complexity and variability of the channel environment,a simple preset constellation is difficult to adapt to all scenarios,so the online constellation optimization method based on Reinforcement Learning(RL)shows its ***,the existing RL technology is difficult to ensure the optimal convergence ***,in this paper,Dynamic Adversarial Interference(DAJ)waveforms are introduced and the DAJ-RL method is proposed by referring to adversarial training in Deep Learning(DL).The algorithm can converge to the optimal state quickly by self-adaptive power and probability direction of dynamic strong adversary of *** this paper,a rigorous theoretical proof of the symbol error rate is given and it is shown that the method approaches the mathematical ***,numerical and hardware experiments show that the constellations generated by DAJ-RL have the best error rate at all noise *** the end,the proposed DAJ-RL method effectively improves the RL-based anti-jamming modulation for cognitive electronic warfare.

关键词： Wireless communication Constellation design Reinforcement learning Adversarial jamming

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From Topological Nodal-Line Semimetals to Quantum Spin Hall Insulators in Tetragonal SnX Monolayers(X=F,Cl,Br,I)

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Chinese physics Letters 2024年第6期41卷 98-111页

作者：朱晔赵宝薛阳徐玮徐文婷杨中芹 State Key Laboratory of Surface Physics Key Laboratory of Computational Physical Sciences(MOE)and Department of PhysicsFudan UniversityShanghai 200433China Shandong Key Laboratory of Optical Communication Science and Technology School of Physics Science and Information TechnologyLiaocheng UniversityLiaocheng 252059China School of Physics East China University of Science and TechnologyShanghai 200237China Shanghai Qi Zhi Institute Shanghai 200030China

Two-dimensional(2D)topological materials have recently garnered significant interest due to their profound physical properties and promising applications for future quantum *** various topological states within one type of materials is,however,seldom *** on first-principles calculations and tightbinding models,we investigate topological electronic states in a novel family of 2D halogenated tetragonal stanene(T-SnX,X=F,Cl,Br,I).All the four monolayers are found to be unusual topological nodal-line semimetals(NLSs),protected by a glide mirror *** spin-orbit coupling(SOC)is turned on,T-SnF and TSnCl are still ascertained as topological NLSs due to the remaining band inversion,primarily composed of Sn pxy orbitals,while T-Sn Br and T-SnI become quantum spin Hall *** phase transition is ascribed to moving up in energy of Sn s orbitals and increasing of SOC *** topology origin in the materials is uniformly rationalized through elementary band *** robust and diverse topological states found in the 2D T-SnX monolayers position them as an excellent material platform for development of innovative topological electronics.

关键词： topological metals quantum

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Thermal conductivity and bending strength of SiC composites reinforced by pitch-based carbon fibers

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Journal of Advanced Ceramics 2022年第2期11卷 247-262页

作者： Liyang CAO Yongsheng LIU Yunhai ZHANG Yejie CAO Jingxin LI Jie CHEN Lu ZHANG Zheng QI Science and Technology on Thermostructural Composites Materials Laboratory Northwestern Polytechnical UniversityXi’an 710072China Science and Technology on Space Physics Laboratory Beijing 100076China

In this work,pitch-based carbon fibers were utilized to reinforce silicon carbide(SiC)composites via reaction melting infiltration(RMI)method by controlling the reaction temperature and resin carbon *** conductivities and bending strengths of composites obtained under different preparation conditions were characterized by various analytical *** showed the formation of SiC whiskers(SiC_(w))during RMI process according to vapor–solid(VS)***_(w) played an important role in toughening the C_(pf)/SiC composites due to crack bridging,crack deflection,and SiC_(w) *** in reaction temperature during RMI process led to an initial increase in thermal conductivity along in-plane and thickness directions of composites,followed by a *** reaction temperature of 1600℃,thermal conductivities along the in-plane and thickness directions were estimated to be 203.00 and 39.59 W/(m×K),*** these conditions,bending strength was recorded as 186.15±3.95 *** in resin carbon content before RMI process led to the generation of more SiC *** conductivities along in-plane and thickness directions remained stable with desirable values of 175.79 and 38.86 W/(m×K),*** comparison,optimal bending strength improved to 244.62±3.07 *** sum,these findings look promising for future application of pitch-based carbon fibers for reinforcement of SiC ceramic composites.

关键词： pitch-based carbon fiber continuous carbon fiber reinforced silicon carbide matrix composites(C/SiC) thermal conductivity bending strength

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Influence of strain rate on grain refinement and texture evolution under complex shear stress conditions

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Journal of Magnesium and Alloys 2023年第7期11卷 2558-2584页

作者： Zhaocan Li Guoqin Wu Jianmin Yu Jiebing Wang Jingjing Han Huiyong Cui Zhimin Zhang College of Materials Science and Engineering North University of China3 Xueyuan RoadTaiyuan 030051China Science and Technology on Space Physics Laboratory China Academy of Launch Vehicle TechnologyBeijing 100076China

The effects of different complex shear stress conditions on grain refinement and texture evolution of Mg-13Gd-4Y-2Zn-0.5Zr alloy were *** increasing strain rate,the average grain size of compression-shear(CS)and compression-torsion(CT)samples are decreased,and the grain size of dynamic recrystallization(DRX)grains is also *** is because that the precipitation number ofβphases is increased,and the hindering effect on grain growth can be significantly *** DRX fractions of CS and CT samples are decreased with increased strain *** low DRX fraction at high strain rate is related to the insufficient time for grains to *** DRX process can be promoted by the PSN mechanism of second phases,and the grain growth can be restricted by the pinning *** the same time,the texture strength is enhanced as the strain rate ***,the kinking degree of lamellar long-period stacking ordered(LPSO)phases is *** complex shear stress conditions,non-basal slip,especially pyramidal slip,is easily activated and the texture is deflected *** with the CS samples,CT samples have smaller average grain size,higher DRX fraction,and lower texture strength for a certain strain *** is because that the equivalent stress of the CT sample is larger,the stress triaxiality is smaller,so more serious dislocations are piled up near grain boundaries and second *** the same time,since CT sample was sheared with torsion,the dislocation movement path can be called“rotational dislocation accumulation”,and the longer distribution path of the CT sample is generated,so more sub-grains and low-angle grain boundaries(LAGBs)are *** with the CS sample,more huge-angle grain boundaries(HAGBs)and DRX grains are formed from grain boundary to grain interior,so better grain refinement effect is achieved.

关键词： Simple shear Compression-shear Compression-torsion Grain refinement Texture evolution ASB

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Water-in-Polymer Salt Electrolyte for Long-Life Rechargeable Aqueous Zinc-Lignin Battery

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Energy & Environmental Materials 2025年第1期8卷 37-46页

作者： Divyaratan Kumar Leandro R.Franco Nicole Abdou Rui Shu Anna Martinelli C.Moyses Araujo Johannes Gladisch Viktor Gueskine Reverant Crispin Ziyauddin Khan Laboratory of Organic Electronics Department of Science and Technology Link èoping University Wallenberg Wood Science Center Department of Science and Technology (ITN) Link èoping University Department of Engineering and Physics Karlstad University Department of Chemistry and Chemical Engineering Chalmers University of Technology Department of Physics and Astronomy Uppsala University

Zinc metal batteries(ZnBs) are poised as the next-generation energy storage solution,complementing lithium-ion batteries,thanks to their costeffectiveness and safety *** benefits originate from the abundance of zinc and its compatibility with non-flammable aqueous ***,the inherent instability of zinc in aqueous environments,manifested through hydrogen evolution reactions(HER) and dendritic growth,has hindered commercialization due to poor cycling stability.

关键词： lignin sustainable water-in-salt electrolyte Zinc Zn-ion battery

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Distributed multi-target tracking with labeled multi-Bernoulli filter considering efficient label matching

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Frontiers of Information technology & Electronic Engineering 2025年第3期26卷 400-414页

作者： Changwen DING Chuntao SHAO Siteng ZHOU Di ZHOU Runle DU Jiaqi LIU School of Astronautics Harbin Institute of TechnologyHarbin 150001China National Key Laboratory of Science and Technology on Test Physics and Numerical Mathematics Beijing 100076China

We propose a distributed labeled multi-Bernoulli(LMB)filter based on an efficient label matching *** distributed LMB filter fusion has the premise that the labels among local densities have already been ***,considering that the label space of each local posterior is independent,such a premise is not practical in many *** achieve distributed fusion practically,we propose an efficient label matching method derived from the divergence of arithmetic average(AA)mechanism,and subsequently label-wise LMB filter fusion is performed according to the matching *** with existing label matching methods,this proposed method shows higher performance,especially in low detection probability ***,to guarantee the consistency and completeness of the fusion outcome,the overall fusion procedure is designed into the following four stages:pre-fusion,label determination,posterior complement,and uniqueness *** performance of the proposed label matching distributed LMB filter fusion is demonstrated in a challenging nonlinear bearings-only multi-target tracking(MTT)scenario.

关键词： Distributed multi-sensor multi-target tracking Labeled multi-Bernoulli filter Arithmetic average fusion Label matching

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Cathodic corrosion as a facile and universal method for scalable preparation of dual-atom electrocatalysts

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Nano Research 2025年第4期18卷 70-77页

作者： Rui Li Tao Shao Fudong Jiang Dong Chen Wenyong Jing Jingwen Ba Yulong Li Yuhan Wu Wenhua Luo Jingsong Xu Institute of Materials China Academy of Engineering PhysicsMianyang 621907China Science and Technology on Surface Physics and Chemistry Laboratory Mianyang 621908China

Dual-atom catalysts(DACs)are emerging as highly efficient electrocatalysts,offering synergistic effects and high atomic ***,we introduce a scalable and facile electrochemical approach for the top-down synthesis of DACs supported on carbon materials via a two-time“plasma treatment+cathodic corrosion”***,metal atoms in nanoparticles on cathode are etched under high negative potential,diffused over the electrode,captured by N doped carbon carriers in electrolyte and forming single-atom *** introducing additional N coordination sites adjacent to the primary metal single-atom sites via a secondary plasma processing and anchoring a second metal atom via a subsequent cathodic corrosion process,DACs are *** as-prepared Pt DACs exhibit enhanced catalytic activity toward hydrogen evolution reaction(HER)with a low overpotential of 0.027 V at 10 mA·cm^(-2) and a Tafel slope of 29.9 mV·dec^(-1) as well as high ***,the proposed electrochemical top-down synthetic route affords promising potential for scalable production of other homonuclear or heteronuclear DACs on multiple carbon substrates,advancing the practical application of DACs in electrocatalysis.

关键词： dual-atom catalysts cathodic corrosion top-down strategy scalable synthesis hydrogen evolution reaction

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Interplay between the atomic structures and superconductivity of two-monolayer Pb films

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science China(physics,Mechanics & Astronomy) 2024年第1期67卷 90-98页

作者： Kun Xie Ze Huang Pengju Li Yumin Xia Desheng Cai Yitong Gu Yuzhou Liu Fangliang Cai Runxiao Zhang Haohao Shi Ping Cui Shengyong Qin International Center for Quantum Design of Functional Materials(ICQD) University of Science and Technology of ChinaHefei 230026China CAS Key Laboratory of Strongly Coupled Quantum Matter Physics Department of PhysicsUniversity of Science and Technology of ChinaHefei 230026China Hefei National Laboratory University of Science and Technology of ChinaHefei 230088China

Superconductors with reduced dimensionality have been widely explored for their exotic superconducting ***,at the two-dimensional limit,two-monolayer Pb films with two types of structures provide an ideal platform to unveil the underlying superconducting mechanism[science 324,1314(2009)].Here,by combining scanning tunneling microscopy(STM)with the first-principle calculations,we successfully identify that these two types have different atomic lattice structures with varying stacking phases,which further enables us to calculate the phonon spectrum and electron phonon coupling strength of each *** theoretical calculations are in good agreement with tunneling spectroscopy measurements of the superconducting transition temperatures(T_(c)),which established a correlation between atomic structures and ***,it was observed that the higher T_(c)of these two types also possess higher out-of-plane upper critical magnetic fields(Hc2).These findings will provide important new insights into two-dimensional superconductivity at the atomic level.

关键词： 2 ML Pb films superconductivity atomic structure scanning tunneling microscopy first-principle calculations

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Effects of projectile parameters on the momentum transfer and projectile melting during hypervelocity impact

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Defence technology（防务技术） 2024年第2期32卷 89-103页

作者： Wenjin Liu Qingming Zhang Renrong Long Zizheng Gong Ren Jiankang Xin Hu Siyuan Ren Qiang Wu Guangming Song State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing100081China Beijing Institute of Spacecraft Environment Engineering China Academy of Space TechnologyBeijing100094China

The effects of projectile/target impedance matching and projectile shape on energy,momentum transfer and projectile melting during collisions are investigated by numerical *** comparing the computation results with the experimental results,the correctness of the calculation and the statistical method of momentum transfer coefficient is *** shapes of aluminum,copper and heavy tungsten alloy projectiles striking aluminum,basalt,and pumice target for impacts up to 10 km/s are *** influence mechanism of the shape of the projectile and projectile/target density on the momentum transfer was *** an increase in projectile density and length-diameter ratio,the energy transfer time between the projectile and targets is *** projectile decelerates slowly,resulting in a larger cratering *** energy consumed by the projectile in the excavation stage increased,resulting in lower mass-velocity of ejecta and momentum transfer *** numerical simulation results demonstrated that for different projectile/target combinations,the higher the wave impedance of the projectile,the higher the initial phase transition velocity and the smaller the mass of phase *** results can provide theoretical guidance for kinetic impactor design and material selection.

关键词： Hypervelocity impact Energy partitioning Impact melting Momentum transfer

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Low Gilbert damping in Bi/In-doped YIG thin films with giant Faraday effect

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Chinese physics B 2024年第10期33卷 419-426页

作者： Jin Zhan Yi Wang Xianjie Wang Hanxu Zhang Senyin Zhu Lingli Zhang Lingling Tao Yu Sui Wenqing He Caihua Wan Xiufeng Han V.I.Belotelov Bo Song School of Physics Harbin Institute of TechnologyHarbin 150001China Beijing National Laboratory for Condensed Matter Physics and Institute of PhysicsChinese Academy of SciencesBeijing 100190China Russian Quantum Center Moscow 119991Russia National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of TechnologyHarbin 150001China Zhengzhou Research Institute Harbin Institute of TechnologyZhengzhou 450046China Frontiers Science Center for Matter Behave in Space Environment Harbin Institute of TechnologyHarbin 150001China

Magnetic films with low Gilbert damping are crucial for magnonic devices,which provide a promising platform forrealizing ultralow-energy *** this study,low Gilbert damping and coercive field were observed in Bi/In-dopedyttrium iron garnet(BiIn:YIG)thin *** BiIn:YIG(444)films were deposited onto different substrates using pulsedlaser *** coercivity(<1 Oe)with saturation magnetization of 125.09 emu/cc was achieved along the in-planedirection of BiIn:YIG *** values of Gilbert damping and inhomogeneous broadening of ferromagnetic resonance inBiIn:YIG films were obtained to be as low as 4.05×10^(-4)and 5.62 Oe,*** addition to low damping,the giantFaraday rotation angles(up to 2.9×10^(4)deg/cm)were also observed in the BiIn:YIG *** modifying the magneticstructure and coupling effect between Bi^(3+)and Fe^(3+)of Bi:YIG,doped In^(3+)plays a key role on variation of the *** low damping and giant Faraday effect made the BiIn:YIG film an appealing candidate for magnonic andmagneto-optical devices.

关键词： magnonic device Gilbert damping Faraday effect

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