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GRB 201223A: Implication of Fallback Accretion onto the Newborn Black Hole from its Multiband Afterglow

Research in Astronomy and Astrophysics 2025年第2期25卷 13-22页

作者： Tian-Hua Lu Dong Xu Wei-Hua Lei Shao-Yu Fu Shuai-Qing Jiang Zi-Pei Zhu Xing Liu Jie An Key Laboratory of Space Astronomy and Technology National Astronomical Observatories Chinese Academy of Sciences School of Astronomy and Space Science University of Chinese Academy of Sciences Chinese Academy of Sciences Department of Astronomy School of Physics Huazhong University of Science and Technology

Multiband afterglow observations of gamma-ray bursts（GRBs） are important for studying the central ***201223A is a GRB with prompt optical detection by GW *** we report on the early optical afterglow of GRB 201223A detected by NEXT（only 2.8 minutes after the Swift/BAT trigger）,which smoothly connects the prompt optical emission and the afterglow *** Amati diagrams and considering the detection of afterglow emission in the Swift u-band,we suggest a redshift range of *** on our optical data and combined with early optical observation from GW AC and early X-ray data from Swift/XRT,a multiband fitting is performed using PyFRS,and we obtain the best afterglow parameters（assuming a redshift of z=1.0）:EK,iso=5.01-1.70+1.91× 1054erg,Γ0=426.58-138.18+148.86,θj=25.98-10.54+9.67deg,n0=0.30-0.26+3.78cm-3,p=2.32-0.01+0.01,εe=3.31-0.86+1.59× 10-5,εB=3.47-2.62+4.12× *** late-time X-ray shows a re-brightening,indicating late-time central engine *** comparing the leading two central engine models,i.e.,magnetar model and hyperaccreting black hole model,we find that the fallback accretion onto a newborn black hole provides a better explanation for the X-ray re-brightening with fallback accretion rate Mp（■）2.76 × 10-9M⊙s-1and the total fallback accreted mass Mfb（■）1.41 × 10-6M⊙.

关键词： GRB: central engine GRB: afterglow GRB: GRB 201223A

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Exceptional points and quantum dynamics in a non-Hermitian two-qubit system

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Chinese physics B 2024年第6期33卷 212-218页

作者：张益玺张振涛杨震山魏晓志梁宝龙 School of Physics Science and Information Technology Shandong Key Laboratory of Optical Communication Science and TechnologyLiaocheng UniversityLiaocheng 252059China

We study the exceptional-point(EP) structure and the associated quantum dynamics in a system consisting of a non-Hermitian qubit and a Hermitian qubit. We find that the system possesses two sets of EPs, which divide the systemparameter space into PT-symmetry unbroken, partially broken and fully broken regimes, each with distinct quantumdynamics characteristics. Particularly, in the partially broken regime, while the PT-symmetry is generally broken in the whole four-dimensional Hilbert space, it is preserved in a two-dimensional subspace such that the quantum dynamics in the subspace are similar to those in the PT-symmetry unbroken regime. In addition, we reveal that the competition between the inter-qubit coupling and the intra-qubit driving gives rise to a complex pattern in the EP variation with system parameters.

关键词： non-Hermitian system exceptional point PT-symmetry

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Photoemission evidence of a novel charge order in kagome metal FeGe

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science China(physics,Mechanics & Astronomy) 2025年第6期Mechanics & Astronomy) .卷 176-182页

作者： Zhisheng Zhao Tongrui Li Peng Li Xueliang Wu Jianghao Yao Ziyuan Chen Yajun Yan Shengtao Cui Zhe Sun Yichen Yang Zhicheng Jiang Zhengtai Liu Alex Louat Timur Kim Cephise Cacho Aifeng Wang Yilin Wang Dawei Shen Juan Jiang Donglai Feng Department of Physics School of Emerging Technology University of Science and Technology of China Hefei National Laboratory University of Science and Technology of China National Synchrotron Radiation Laboratory School of Nuclear Science and Technology University of Science and Technology of China Low Temperature Physics Laboratory College of Physics and Center of Quantum Materials and Devices Chongqing University State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information Technology (SIMIT)Chinese Academy of Sciences Shanghai Synchrotron Radiation Facility Shanghai Advanced Research Institute Chinese Academy of Sciences Diamond Light Source Ltd. Harwell Science and Innovation Campus New Cornerstone Science Laboratory University of Science and Technology of China

The kagome metal Fe Ge provides a rich platform for understanding the mechanisms behind competing orders, as it exhibits charge order(CO) emerging deep within the antiferromagnetic phase. To investigate the intrinsic origin of this behavior, we examine the evolution of the low-energy electronic structure across the phase transition in annealed Fe Ge samples using angleresolved photoemission spectroscopy. We find no evidence supporting a conventional nesting mechanism, such as Fermi surface nesting or van Hove singularities. However, we observe two notable changes in the band structure: an electron-like band around the K point and another around the A point, both shifting upward in energy when CO forms. These findings are consistent with our density-functional theory calculations, which suggest that the charge order in Fe Ge is primarily driven by magnetic energy savings due to a lattice distortion involving Ge1-dimerization. Our results provide photoemission evidence supporting this novel mechanism for CO formation in Fe Ge, in contrast to the conventional nesting-driven mechanisms.

关键词： kagome metal charge order electronic structure angle-resolved photoemission spectroscopy

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Effect of copper/tungsten heterophase interface on radiation resistance: Insights from atomistic simulations

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Chinese physics B 2025年第4期34卷 501-508页

作者： Wen Chen Min Li Bao-Qin Fu Tun Chen Jie-Chao Cui Qing Hou Key Laboratory of Radiation Physics and Technology of the Ministry of Education Institute of Nuclear Science and TechnologySichuan UniversityChengdu 610064China

Nanostructured materials have demonstrated superior radiation-damage tolerance compared to their coarse-grained counterparts,contributing to the extended lifespan of nuclear ***,the mechanisms underlying this enhanced irradiation resistance remain *** this study,we present atomistic simulations to investigate the impact of Cu/W heterophase interface on the evolution of irradiation-induced *** simulation results reveal that the Cu/W interfaces can act as defect sinks,effectively trapping self-interstitial atoms(SIAs).Furthermore,the interface demonstrates both the interstitial emission and interstitial transfer mechanisms,wherein the trapped W SIAs facilitate the emission of Cu atoms from the interface to the Cu *** emitted Cu SIAs can promote defect recombination on the Cu side,leading to a reduced defect concentration in the Cu/W ***,these combined mechanisms contribute to a lower overall concentration of irradiation-induced defect,thereby enhancing the radiation resistance of Cu/W nanomultilayers.

关键词： molecular dynamics Cu/W nano-multilayers interstitial transfer mechanism radiation resistance

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Design and experimental study of a field-reversed configuration plasma thruster prototype

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Plasma science and technology 2025年第3期27卷 118-126页

作者： Yuxuan HUANG Ming ZHANG Yong YANG Fangwei LYU Xiaopeng YI Chaofan LYU Yisong ZHANG Bo RAO 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 National Key Laboratory of Science and Technology on Vacuum Technology and Physics Lanzhou Institute of PhysicsLanzhou 730000People’s Republic of China

The field-reversed configuration(FRC)plasma thruster driven by rotating magnetic field(RMF),abbreviated as the RMF-FRC thruster,is a new type of electric propulsion technology that is expected to accelerate the deep space *** experimental prototype,including diagnostic devices,was designed and constructed based on the principles of the RMF-FRC thruster,with an RMF frequency of 210 kHz and a maximum peak current of 2 *** the rated operating conditions,the initial plasma density was measured to be 5×10^(17)m^(-3),and increased to 2.2×10^(19)m^(-3)after the action of *** coupling efficiency of RMF was about 53%,and the plasma current reached 1.9 *** axial magnetic field changed in reverse by 155 Gauss,successfully reversing the bias magnetic field of 60 Gauss,which verifies the formation of FRC *** optimization research,it was found that when the bias magnetic field is 100 Gauss,the axial magnetic field reverse variation caused by FRC is the highest at 164 *** experimental results are discussed and strategies are proposed to improve the performance of the prototype.

关键词： rotating magnetic field(RMF) field-reversed configuration(FRC) plasma thrusters plasma current

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Interface compatibility between sulfide solid electrolytes and Ni-rich oxide cathode materials:Factors,modification,perspectives

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Journal of Energy Chemistry 2025年第2期101卷 233-262,I0006页

作者： Tianwen Yang Haijuan Pei Haijian Lv Shijie Lu Qi Liu Daobin Mu Beijing Key Laboratory of Environmental Science and Engineering School of Materials Science an EngineeringBeijing Institute of TechnologyBeijing 100081China State Key Laboratory of Space Power-Sources Technology Shanghai Institute of Space Power-SourcesShanghai 200245China

All-solid-state batteries(ASSBs)assembled with sulfide solid electrolytes(SSEs)and nickel(Ni)-rich oxide cathode materials are expected to achieve high energy density and safety,representing potential candidates for the next-generation energy storage ***,interfacial issues between SSEs and Nirich oxide cathode materials,attributed to space charge layer,interfacial side reactions,and mechanical contact failure,significantly restrict the performances of *** interface degradation is closely related to the components of the composite cathode and the process of electrode *** on the influencing factors of interface compatibility between SSEs and Ni-rich oxide cathode,this article systematically discusses how cathode active materials(CAMs),electrolytes,conductive additives,binders,and electrode fabrication impact the interface *** addition,the strategies for the compatibility modification are ***,the challenges and prospects of intensive research on the degradation and modification of the SSE/Ni-rich cathode material interface are *** review is intended to inspire the development of high-energy-density and high-safety all-solid-state batteries.

关键词： Sulfide solid electrolyte Ni-rich oxide cathode Interface compatibility Influencing factors All-solid-state batteries

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A stereoscope observation of the South Atlantic Anomaly: Initial observations from Macao science Satellite-1 A&B

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science China(Technological sciences) 2024年第11期67卷 3321-3323页

作者： ZONG QiuGang HE ZhaoGuo State Key Laboratory of Lunar and Planetary Sciences Macao University of Science and TechnologyMacao 99908China Institute of Space Physics and Applied Technology Peking UniversityBeijing 100871China

The South Atlantic Anomaly(SAA) is a giant space radiation spot where the intensity of Earth's magnetic field is the weakest at a given altitude in near-Earth space. The energetic particles can be captured into SAA to form the most hazardous radiation region, for decades there remained little direct evidence that revealed the energetic electron dynamic and evolution in the SAA region.

关键词： Atlantic Earth altitude

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Background removal from global auroral images:Data-driven dayglow modeling

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Earth and Planetary physics 2024年第1期8卷 247-257页

作者： A.Ohma M.Madelaire K.M.Laundal J.P.Reistad S.M.Hatch S.Gasparini S.J.Walker Birkeland Centre for Space Science Department of Physics and TechnologyUniversity of BergenBergenNorway

Global images of auroras obtained by cameras on spacecraft are a key tool for studying the near-Earth ***,the cameras are sensitive not only to auroral emissions produced by precipitating particles,but also to dayglow emissions produced by photoelectrons induced by *** emissions and scattered sunlight can contribute to the background *** fully utilize such images in space science,background contamination must be removed to isolate the auroral *** we outline a data-driven approach to modeling the background intensity in multiple images by formulating linear inverse problems based on B-splines and spherical *** approach is robust,flexible,and iteratively deselects outliers,such as auroral *** final model is smooth across the terminator and accounts for slow temporal variations and large-scale asymmetries in the *** demonstrate the model by using the three far ultraviolet cameras on the Imager for Magnetopause-to-Aurora Global Exploration(IMAGE)*** method can be applied to historical missions and is relevant for upcoming missions,such as the Solar wind Magnetosphere Ionosphere Link Explorer(SMILE)mission.

关键词： aurora dayglow modeling global auroral images far ultraviolet images dayglow removal

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Optoelectronic tuning of plasmon resonances via optically modulated hot electrons

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National science Review 2024年第5期11卷 134-141页

作者： Jiacheng Yao Cheng Wang Chi Zhang Song Ma Li Zhou Ti Wang Ququan Wang Hongxing Xu Tao Ding Key Laboratory of Artificial Micro Nano Structure of Ministry of Education School of Physics and Technology Wuhan University Department of Physics Southern University of Science and Technology

Fast optical modulation of nanoplasmonics is fundamental for on-chip integration of all-optical *** various strategies have been proposed for dynamic modulation of surface plasmons, critical issues of device compatibility and extremely low efficiency in the visible spectrum hamper the application of optoplasmonic nanochips. Here we establish an optoplasmonic system based on Au@Cu2–xS hybrid core–shell nanoparticles. The optical excitation of hot electrons and their charge transfer to the semiconductor coating(Cu2–xS) lead to lowered electron density of Au, which results in the red shift of the localized surface plasmon resonance. The hot electrons can also transport through the Cu2–xS layer to the metal substrate, which increases the conductance of the nanogap. As such, the coupled gap plasmon blue-shifts with a magnitude of up to ～15 nm, depending on the excitation power and the thickness of the coatings, which agrees with numerical simulations. All of this optoelectronic tuning process is highly reversible, controllable and fast with a modulated laser beam, which is highly compatible and sufficiently useful for on-chip integration of nanophotonic devices.

关键词： hot carriers plasmon switching optoplasmonics circuit modelNPoM

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Drag reduction characteristics of recirculation flow at rocket base in an RBCC engine under ramjet/scramjet mode

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Chinese Journal of Aeronautics 2024年第3期37卷 104-115页

作者： Menglei LI Mingbo SUN Peibo LI Daoning YANG Bin AN Yizhi YAO Jikai CHEN Taiyu WANG Jiaoru WANG Hypersonic Technology Laboratory National University of Defense TechnologyChangsha 410073China Department of Aerospace Science and Technology Space Engineering UniversityBeijing 101416China

To reduce the drag generated by the recirculation flow at the rocket base in a RocketBased Combined Cycle(RBCC)engine operating in the ramjet/scramjet mode,a novel annular rocket RBCC engine based on a central plug cone was *** performance loss mechanism caused by the recirculation flow at the rocket base and the influence of the plug cone configuration on the thrust performance were *** indicated that the recirculation flow at the rocket base extended through the entire combustor,which creates an extensive range of the"low-kineticenergy zone"at the center and leads to an engine thrust *** plug cone serving as a surface structure had a restrictive effect on the internal flow of the engine,making it smoothly transit at the position of the large separation *** model RBCC engine could achieve a maximum thrust augmentation of 37.6%with a long plug cone that was twice diameter of the inner ***,a shorter plug cone that was half diameter of the inner isolator proved less effective at reducing the recirculation flow for a supersonic flow and induced an undesirable flow fraction that diminished the thrust ***,the effectiveness of the plug cone increased with the flight Mach number,indicating that it could further broaden the operating speed range of the scramjet mode.

关键词： Rocket-based combined cycle Ramjet/scramjet mode Plug cone Drag reduction k-x SST turbulent model

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