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Study on damage mechanism and damage distribution of the rear plate under impact of debris cloud

Defence technology（防务技术） 2024年第5期35卷 151-167页

作者： Chenyang Wu Xiaowei Chen Qiguang He State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyHaidian DistrictBeijing 100081China School of Mechatronical Engineering Beijing Institute of TechnologyHaidian DistrictBeijing 100081China Institute of Fluid Physics China Academy of Engineering PhysicsMianyang 621900SichuanChina

The debris cloud generated by the hypervelocity impact(HVI)of orbiting space debris directly threatens the spacecraft.A full understanding of the damage mechanism of rear plate is useful for the optimal design of protective *** this study,the hypervelocity yaw impact of a cylindrical aluminum projectile on a double-layer aluminum plate is simulated by the FE-SPH adaptive method,and the damage process of the rear plate under the impact of the debris cloud is analyzed based on the debris cloud *** damage process can be divided into the main impact stage of the debris cloud and the structural response of the rear *** main impact stage lasts a short time and is the basis of the rear plate *** the stage of structure response,the continuous deformation and inertial motion of the rear plate dominate the perforation of the rear *** further analyze the damage mechanism and damage distribution characteristics of the rear plate in ***,the connection between velocity space and position space of the debris cloud is established,which promotes the general analysis of the damage law of debris *** on the relationship,the features of typical damage areas are identified by the localized fine *** the cumulative effect and structural response cause the perforation of rear plate;in the non-perforated area,cratering by the impact of hazardous fragments is the main damage mode of the rear plate.

关键词： Damage of rear plate Debris cloud Secondary impact Hypervelocity yaw impact FE-SPH adaptive method

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A Two-Dimensional Third-Order CESE Scheme for Ideal MHD Equations

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Communications in Computational physics 2023年第6期33卷 94-115页

作者： Yufen Zhou Xueshang Feng SIGMA Weather Group State Key Laboratory for Space WeatherNational Space Science CenterChinese Academy of ScienceBeijing 100190China Shenzhen Key Laboratory of Numerical Prediction for Space Storm Institute of Space Science and Applied TechnologyHarbin Institute of TechnologyShenzhen 518055China

In this paper,we construct a two-dimensional third-order space-time conservation element and solution element(CESE)method and apply it to the magnetohydrodynamics(MHD)*** third-order CESE method preserves all the favorable attributes of the original second-order CESEmethod,such as:(i)flux conservation in space and time without using an approximated Riemann solver,(ii)genuine multi-dimensional algorithm without dimensional splitting,(iii)the use of the most compact mesh stencil,involving only the immediate neighboring cells surrounding the cell where the solution at a new time step is sought,and(iv)an explicit,unified space-time integration procedure without using a quadrature integration *** order to verify the accuracy and efficiency of the scheme,several 2D MHD test problems are *** result of MHD smooth wave problem shows third-order convergence of the *** results of the other MHD test problems show that the method can enhance the solution quality by comparing with the original second-order CESE scheme.

关键词： CESE method third-order MHD equations

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Autonomous navigation method of satellite constellation based on adaptive forgetting factors

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Chinese Journal of Aeronautics 2024年第7期37卷 317-332页

作者： Dong WANG Jing YANG Kai XIONG School of Automation Science and Electrical Engineering Beihang UniversityBeijing 100191China Science and Technology on Space Intelligent Control Laboratory Beijing Institute of Control EngineeringBeijing 100094China

To address the problem that model uncertainty and unknown time-varying system noise hinder the filtering accuracy of the autonomous navigation system of satellite constellation,an autonomous navigation method of satellite constellation based on the Unscented Kalman Filter with Adaptive Forgetting Factors(UKF-AFF)is *** process noise covariance matrix is estimated online with the strategy that combines covariance matching and adaptive adjustment of forgetting *** adaptive adjustment coefficient based on squared Mahalanobis distance of state residual is employed to achieve online regulation of forgetting factors,equipping this method with more *** intersatellite direction vector obtained from photographic observations is introduced to determine the constellation satellite orbit together with the distance measurement to avoid rank deficiency *** that the number of available measurements varies online with intersatellite visibility in practical applications such as time-varying constellation configurations,the smooth covariance matrix of state correction determined by innovation and gain is adopted and constructed *** analysis of the proposed method is also *** effectiveness of the proposed method is verified by the Monte Carlo simulation and comparison *** estimation accuracy of constellation position and velocity of UKF-AFF is improved by 30%and 44%respectively compared to those of the extended Kalman filter,and the method proposed is also better than other several adaptive filtering methods in the presence of significant model uncertainty.

关键词： Constellation autonomous navigation Unscented Kalman filter Adaptive forgetting factor Model uncertainty Stability analysis

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Surface evolution of thermoelectric material KCu_(4)Se_(3) explored by scanning tunneling microscopy

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Chinese physics B 2024年第8期33卷 422-427页

作者：夏玉敏马妮蔡德胜刘宇舟谷易通于淦霍思宇庞文慧肖翀秦胜勇 International Center for Quantum Design of Functional Materials(ICQD) Hefei National Laboratory for Physical Sciences at Microscale(HFNL)University of Science and Technology of ChinaHefei 230026China CAS Key Laboratory of Strong Coupled Quantum Matter Physics Department of PhysicsUniversity of Science and Technology of ChinaHefei 230026China Hefei National Laboratory for Physical Sciences at the Microscale University of Science and Technology of ChinaHefei 230026China Institute of Energy Hefei Comprehensive National Science CenterHefei 230031China Dalian National Laboratory for Clean Energy Chinese Academy of Sciences(CAS)Dalian 116023China Hefei National Laboratory University of Science and Technology of ChinaHefei 230088China

Novel two-dimensional thermoelectric materials have attracted significant attention in the field of thermoelectric due to their low lattice thermal conductivity.A comprehensive understanding of their microscopic structures is crucial for driving further the optimization of materials properties and developing novel functional ***,by using in situ scanning tunneling microscopy,we report the atomic layer evolution and surface reconstruction on the cleaved thermoelectric material KCu_(4)Se_(3) for the first *** clearly revealed each atomic layer,including the naturally cleaved K atomic layer,the intermediate Se^(2-)atomic layer,and the Se^(-)atomic layer that emerges in the thermodynamic-stable *** from the maj ority of studies that predominantly concentrate on macroscopic measurements of the charge transport,our results reveal the coexistence of potassium disorder and complex reconstructed patterns of selenium,which potentially influences charge carrier and lattice *** results provide direct insight into the surface microstructures and evolution of KCu_(4)Se_(3),and shed useful light on designing functional materials with superior performance.

关键词： thermoelectric KCu_(4)Se_(3) scanning tunneling microscopy(STM) evolution

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Ultrafast synthesis of highly graphitized carbon foams through water explosion method

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Progress in Natural science:Materials International 2024年第6期34卷 1207-1215页

作者： Pengfei Huang Zhikai Miao Zekun Li Li Chen Yuan Li Zhedong Liu Jingchao Zhang Jiawei Luo Wenjun Zhang Wei-Di Liu Xinxi Zhang Rongtao Zhu Yanan Chen School of Chemical Engineering and Technology China University of Mining and Technology School of Materials Science and Engineering Key Laboratory of Advanced Ceramics Machining Technology of Ministry of Education Tianjin Key Laboratory of Composite and Functional Materials Tianjin University School of Chemistry and Physics ARC Research Hub in Zero-emission Power Generation for Carbon Neutrality and Centre for Materials Science Queensland University of Technology

In recent years, carbon foams have attracted considerable attention due to their distinctive physical and chemical properties, including high specific surface area, excellent electrical conductivity, and robust chemical stability,which render them highly suitable for applications in energy storage, catalysis, and adsorption. However, conventional carbon foams are limited by low levels of graphitization and a lack of long-range structural order,restricting their use in high-performance applications. Traditional synthesis methods, such as templating,chemical activation, and hydrothermal processes, although effective in forming porous structures, are complex and inefficient. To overcome these limitations, this study introduces a novel one-step water explosion method that combines Joule heating and steam activation to synthesize highly graphitized porous carbon foam. By rapidly vaporizing intercalated water molecules between graphite layers, the method overcomes van der Waals forces,leading to the exfoliation of the material. The process, conducted under ultra-high temperatures in less than 1 s,produces carbon foam with high porosity, large surface area, and excellent electrochemical performance. In lithium-ion battery tests, the carbon foam exhibited a high capacity of 516.2 m Ah/g at 0.1 A/g and retained92.77 % of its capacity after 1100 cycles. This efficient and scalable synthesis technique offers a promising pathway for the development of advanced anode materials in energy storage applications, significantly outperforming conventional graphite-based materials.

关键词： Water explosion Joule heating Carbon foam High graphitization Lithium-ion batteries anode

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Optical pumping through the Liouvillian skin effect

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Physical Review B 2025年第6期111卷 L060301-L060301页

作者： De-Huan Cai Wei Yi Chen-Xiao Dong Hefei National Laboratory University of Science and Technology of China Hefei 230088 China CAS Key Laboratory of Quantum Information University of Science and Technology of China Hefei 230026 China CAS Center for Excellence in Quantum Information and Quantum Physics Hefei 230026 China

The Liouvillian skin effect describes the boundary affinity of Liouvillian eignemodes that originates from the intrinsic non-Hermiticity of the Liouvillian superoperators. Dynamically, it manifests as directional flow in the transient dynamics, and the accumulation of population near open boundaries at long times. Intriguingly, similar dynamic phenomena exist in the well-known process of optical pumping, where the system is driven into a desired state (or a dark-state subspace) through the interplay of dissipation and optical drive. In this work, we show that typical optical pumping processes can indeed be understood in terms of the Liouvillian skin effect. By studying the Liouvillian spectra under different boundary conditions, we reveal that the Liouvillian spectra of the driven-dissipative pumping process sensitively depend on the boundary conditions in the state space, a signature that lies at the origin of the Liouvillian skin effect. Such a connection provides insights and practical means for designing efficient optical pumping schemes through engineering Liouvillian gaps under the open boundary condition. Based on these understandings, we show that the efficiency of a typical sideband cooling scheme for trapped ions can be dramatically enhanced by introducing counterintuitive dissipative channels. Our results provide a useful perspective for optical pumping, with interesting implications for state preparation and cooling.

关键词： Optical pumping

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Optical Mode Entanglement Generation from an Optomechanical Nanobeam

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Chinese physics Letters 2024年第11期41卷 62-76页

作者： Qi-Zhi Cai Bo-Yu Fan Yun-Ru Fan Guang-Wei Deng You Wang Hai-Zhi Song Guang-Can Guo Qiang Zhou Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of ChinaChengdu 611731China Center for Quantum Internet Tianfu Jiangxi LaboratoryChengdu 641419China Key Laboratory of Quantum Physics and Photonic Quantum Information(Ministry of Education) University of Electronic Science and Technology of ChinaChengdu 611731China Southwest Institute of Technical Physics Chengdu 610041China CAS Key Laboratory of Quantum Information University of Science and Technology of ChinaHefei 230026China Jiangxi Research Institute University of Electronic Science and Technology of ChinaChengdu 641419China

Nano-optomechanical systems,capable of supporting enhanced light-matter interactions,have wide applications in studying quantum entanglement and quantum information ***,preparing optical telecomband entanglement within a single optomechanical nanobeam remains *** propose and design a triply resonant optomechanical nanobeam to generate steady-state entangled propagating optical modes and present its quantum-enhanced performance for teleportation-based quantum state transfer under realistic ***,the entanglement quantified by logarithmic negativity can obtain E_(N)=***,with structural imperfections induced by realistic fabrication processes considered,the device still shows great *** with quantum interfaces between mechanical motion and solid-state qubit processors,the proposed device potentially paves the way for versatile nodes in long-distance quantum networks.

关键词： quantum beam preparing

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Recent advances in tantalum nitride for photoelectrochemical water splitting

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Chinese Journal of Catalysis 2025年第1期68卷 51-82页

作者： Wenjie Yu Chao Feng Ronghua Li Beibei Zhang Yanbo Li Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of ChinaChengdu 611731SichuanChina Key Laboratory of Quantum Physics and Photonic Quantum Information Ministry of EducationUniversity of Electronic Science and Technology of ChinaChengdu 611731SichuanChina

Harnessing solar energy for renewable fuel production through artificial photosynthesis offers an ideal solution to the current energy and environmental *** various methods,photoelectrochemical(PEC)water splitting stands out as a promising approach for direct solar-driven hydrogen *** the efficiency and stability of photoelectrodes is a key focus in PEC water-splitting *** nitride(Ta_(3)N_(5)),with its suitable band gap and band-edge positions for PEC water splitting,has emerged as a highly promising photoanode *** review begins by introducing the history and fundamental characteristics of Ta_(3)N_(5),emphasizing both its advantages and *** then explores methods to improve light absorption efficiency,charge separation and transfer efficiency,surface reaction rate,and the stability of Ta_(3)N_(5) ***,the review discusses the progress of research on tandem PEC cells incorporating Ta_(3)N_(5) ***,it looks ahead to future research directions for Ta_(3)N_(5) *** strategic approach outlined in this review can also be applied to other photoelectrode materials,providing guidance for their development.

关键词： Photoelectrochemical water splitting Tantalum nitride Lightabsorption efficiency Charge separation and transfer efficiency Surfacereaction rate Stability

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Anisotropic Band Evolution of Bulk Black Phosphorus Induced by Uniaxial Tensile Strain

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Chinese physics Letters 2024年第3期41卷 83-96页

作者：邓亚丰张艺琳赵亚飞徐永康代兴泽王双海陆显扬黎遥徐永兵何亮 National Key Laboratory of Spin Chip and Technology School of Electronic Science and EngineeringNanjing UniversityNanjing 210023China College of Optical and Electronic Technology China Jiliang UniversityHangzhou 310018China School of Physics and Engineering Henan University of Science and TechnologyLuoyang 471023China

We investigate the anisotropic band structure and its evolution under tensile strains along different crystallographic directions in bulk black phosphorus(BP)using angle-resolved photoemission spectroscopy and density... 详细信息

关键词： directions Bulk phosphorus

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Studies of an event-building algorithm of the readout system for the twin TPCs in HFRS

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Nuclear science and Techniques 2024年第4期35卷 82-95页

作者： Jing Tian Zhi-Peng Sun Song-Bo Chang Yi Qian Hong-Yun Zhao Zheng-Guo Hu Xi-Meng Chen Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China School of Nuclear Science and Technology University of LanzhouLanzhou 730000China School of Nuclear Science and Technology University of Chinese Academy of SciencesBeijing 100049China Advanced Energy Science and Technology Guangdong LaboratoryHuizhou 516000China

The High-energy Fragment Separator(HFRS),which is currently under construction,is a leading international radioactive beam *** sets of position-sensitive twin time projection chamber(TPC)detectors are distributed on HFRS for particle identification and beam *** twin TPCs'readout electronics system operates in a trigger-less mode due to its high counting rate,leading to a challenge of handling large amounts of *** address this problem,we introduced an event-building *** algorithm employs a hierarchical processing strategy to compress data during transmission and *** addition,it reconstructs twin TPCs'events online and stores only the reconstructed particle information,which significantly reduces the burden on data transmission and storage *** studies demonstrated that the algorithm accurately matches twin TPCs'events and reduces more than 98%of the data volume at a counting rate of 500 kHz/channel.

关键词： High counting rate Twin TPCs Trigger-less Readout electronics Event building Hierarchical data processing

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