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Porous silicon/carbon composites as anodes for high-performance lithium-ion batteries

新型炭材料（中英文） 2024年第5期39卷 992-1002页

作者： tian Zhen-yu WANG Ya-fei QIN Xin Shaislamov Ulugbek Hojamberdiev Mirabbos ZHENG Tong-hui DONG Shuo zhang Xing-hao KONG De-bin {2. Lin-jie school of Materials Science and Engineering China University of Petroleum(East China)Qingdao 266580China College of New Energy China University of Petroleum(East China)Qingdao 266580China Center for Development of Nanotechnology at the National University of Uzbekistan Tashkent 100174Uzbekistan Department of physics National University of UzbekistanTashkent 100174Uzbekistan Institut für Chemie Technische Universität BerlinBerlin 10623Germany Advanced Chemical Engineering and Energy Materials Research Center China University of Petroleum(East China)Qingdao 266580China

Silicon anodes are promising for use in lithium-ion ***,their practical application is severely limited by their large volume expansion leading to irreversible material fracture and electrical *** study proposes a new top-down strategy for preparing microsize porous silicon and introduces polyacrylonitrile(PAN)for a nitrogen-doped carbon coating,which is designed to maintain the internal pore volume and lower the expansion of the anode during lithiation and *** then explore the effect of temperature on the evolution of the structure of PAN and the electrochemical behavior of the composite *** treatment at 400℃,the PAN coating retains a high nitrogen content of 11.35 at%,confirming the presence of C—N and C—O bonds that improve the ionic-electronic transport *** treatment not only results in a more intact carbon layer structure,but also introduces carbon defects,and produces a material that has remarkable stable cycling even at high *** cycled at 4 A g^(-1),the anode had a specific capacity of 857.6 mAh g^(-1) even after 2.0 cycles,demonstrating great potential for high-capacity energy storage applications.

关键词： Porous silicon Lithium-ion batteries Polyacrylonitrile Electrochemical behavior

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Fabrication of dodecagonal pyramid on nitrogen face GaN and its effect on the light extraction

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Science China(Technological Sciences) 2010年第3期53卷 769-771页

作者： QI ShengLi,CHEN zhiZhong,SUN YongJian,FANG Hao,TAO YueBin,SANG LiWen,tian PengFei,DENG JunJing,ZHAO Lu{2.,YU TongJun,QIN zhiXin&{2. GuoYi State Key Laboratory for Artificial Microstructure and Mesoscopic physics,school of physics,Peking University,beijing 100871,China State Key Laboratory for Artificial Microstructure and Mesoscopic physics School of Physics Peking University Beijing China

Wet etching has been widely used in defect evaluation for Ga-face GaN and surface roughness for N-face GaN dodecagonal pyramids has been fabricated on laser-lift-off N-face GaN by hot phosphor acid *** dodecagonal pyramid shows twelve facets including six{2.-2.3}and six{2.-4-5}*** cross-sectional TEM image,it is shown that the pyramid corresponds to the top of the edge *** with hexagonal pyramid-surface light emitting diodes(LEDs)etched by commonly used photoelectrochemical(PEC)process in KOH aqueous,the dodecagonal pyramid-surface LEDs show improved light extraction efficiency because of more facets,which effectively reduces the total internal reflection.

关键词： GaN N face wet etching H3PO4 dodecagonal pyramid light extraction

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Photorefractive Effect in Poly(N-vinylcarbazole)-Based Composite Sensitised by C_(60)

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Chinese Chemical Letters 1997年第9期8卷 807-810页

作者： zhi Jie zhang Yi Wang CHEN Yuan Kang HE and Hui Ying CHEN(Institute of Polymer Science, College of Chemistry, Peking University, {2., {2.)zhi Jian CHEN Shu Feng WANG and Qi Huang GONG(Department of physics, Mesoscopic physics Laboratory, Peking U Institute of Polymer Science College of Chemistry Peking University Beijing 100871 China Department of physics Mesoscopic Physics Laboratory Peking University Beijing 100871 China

A new PVK-based photorefractive polymer composite sensitized by C60 and doped with a higher content of EO chromophore was prepared. The high optical quality thin-film was formed between two ITOcovered glass electrodes. Two-beam-coupling (2.C) experiment was performed by using a He-Ne laser (at wavelength 632.8nm), and an obvious photorefractive performance was observed. The dependence of two-beamcoupling gain coefficient on the applied poling dc electric field was measured.

关键词： Photorefractive Effect in Poly Based Composite Sensitised by C N-vinylcarbazole Rev

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Evaluation of neutron cross sections of^(48)Ti based on the Unified-Monte-Carlo-B method

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Chinese physics C 2024年第7期48卷 118-130页

作者：夏候琼续瑞瑞刘萍 Roberto Capote 田源陶曦吴小飞张玥葛智刚舒能川冯松 China Nuclear Data Center China Institute of Atomic EnergyBeijing 102413China NAPC–Nuclear Data Section P.O.Box 100Vienna International CentreA-1400ViennaAustria school of Nuclear Science and Technology University of South ChinaHengyang 421001China

A cross section evaluation of neutron induced reactions on^(48)Ti is undertaken using the Unified Monte Carlo-B(UMC-B)*** evaluation concentrates on estimating the covariance and the use of the UMC-B allows avoiding the deficiencies of linear regression brought by the traditional least squares *** main neutron and charged particle emission reactions from n+^(48)Ti in the fast neutron energy region below 2. MeV are studied in this *** posterior probability density function(PDF)of each neutron cross section is obtained in a UMC-B Bayesian approach by convoluting the model PDFs sampled based on model parameters and the likelihood functions for the experimental *** model parameters including level density,pair corrections,optical model and Kalbach matrix element parameter are stochastically sampled with the assumption of normal distributions to estimate the model *** Cholesky factorization approach is applied to consider potential parameter ***,the posterior covariance matrices are generated using the UMC-B generated *** new evaluated results are compared with the CENDL-3.2.ENDF/B-VIII.0,JEFF-3.3,TENDL-2.2. and JENDL-5 evaluations and differences are discussed.

关键词： covariance Unified Monte Carlo B(UMC-B) ^(48)Ti neutron cross sections Cholesky factor-ization approach

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The Velocity Aberration Effect of the CSST Main Survey Camera

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Research in astronomy and Astrophysics 2024年第9期24卷 119-127页

作者： Hui-Mei Feng Zi-Huang Cao Man ILam Ran Li Hao tian Xin zhang Peng Wei Xin-Feng Li Wei Wang Hugh RAJones Mao-Yuan Liu Chao Liu National Astronomical Observatories Chinese Academy of SciencesBeijing 100101China Institute for Frontiers in astronomy and Astrophysics Beijing Normal UniversityBeijing 102206China Key Laboratory of Cosmic Rays(Tibet University) Ministry of EducationLhasa 850000China University of Chinese Academy of Sciences Beijing 100049China Technology and Engineering Center for Space Utilization Chinese Academy of SciencesBeijing 100094China Changchun Institute of Optics Fine Mechanics and PhysicsChinese Academy of SciencesChangchun 130033China Centre for Astrophysics University of HertfordshireHatfieldUK

In this study,we conducted simulations to find the geometric aberrations expected for images taken by the Main Survey Camera of the Chinese Space Station Telescope(CSST)due to its *** anticipated by previous work,our findings indicate that the geometric distortion of light impacts the focal plane's apparent scale,with a more pronounced influence as the size of the focal plane *** models suggest that the effect consistently influences the pixel scale in both the vertical and parallel *** apparent scale variation follows a sinusoidal distribution throughout one orbital *** reveal that the effect is particularly pronounced in the center of the Galaxy and gradually diminishes along the direction of ecliptic *** low ecliptic latitudes,the total aberration leads to about a 0.94 pixel offset(a 2. minute exposure)and a 0.2. pixel offset(a 300 s exposure)at the edge of the field of *** processings for the geometric effect during the CSST pre-and post-observation phases are presented.

关键词： astrometry telescopes Astronomical Instrumentation Methods and Techniques

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Remote sensing image encryption algorithm based on novel hyperchaos and an elliptic curve cryptosystem

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Chinese physics B 2024年第5期33卷 292-304页

作者：田婧希金松昌张晓强杨绍武史殿习 school of Computer Science National University of Defense TechnologyChangsha 410003China Intelligent Game and Decision Laboratory (IGDL) Beijing 100091China school of Information and Control Engineering China University of Mining and TechnologyXuzhou 221116China

Remote sensing images carry crucial ground information,often involving the spatial distribution and spatiotemporal changes of surface *** safeguard this sensitive data,image encryption technology is *** this paper,a novel Fibonacci sine exponential map is designed,the hyperchaotic performance of which is particularly suitable for image encryption *** encryption algorithm tailored for handling the multi-band attributes of remote sensing images is *** algorithm combines a three-dimensional synchronized scrambled diffusion operation with chaos to efficiently encrypt multiple ***,the keys are processed using an elliptic curve cryptosystem,eliminating the need for an additional channel to transmit the keys,thus enhancing *** results and algorithm analysis demonstrate that the algorithm offers strong security and high efficiency,making it suitable for remote sensing image encryption tasks.

关键词： hyperchaotic system elliptic curve cryptosystem(ECC) 3D synchronous scrambled diffusion remote sensing image unmanned aerial vehicle(UAV)

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HiFAST:An HI Data Calibration and Imaging Pipeline for FAST.Ⅱ.Flux Density Calibration

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Research in astronomy and Astrophysics 2024年第8期24卷 100-112页

作者： Ziming Liu Jie Wang Yingjie Jing zhi-Yu zhang Chen Xu {2.{2. Liang Qingze Chen Ningyu Tang Qingliang Yang National Astronomical Observatories Chinese Academy of SciencesBeijing 100101China Institute for Frontiers in astronomy and Astrophysics Beijing Normal UniversityBeijing 102206China school of astronomy and Space Science University of Chinese Academy of SciencesBeijing 100049China school of astronomy and Space Science Nanjing UniversityNanjing 210023China Key Laboratory of Modern astronomy and Astrophysics Nanjing UniversityNanjing 210023China Department of physics Anhui Normal UniversityWuhu 241002China

Accurate flux density calibration is essential for precise analysis and interpretation of observations across different observation modes and *** this research,we first introduce the flux calibration model that incorporated in Hi FAST pipeline,and designed for processing HⅠ2. cm ***,we investigate different calibration techniques and assess the dependence of the gain parameter on the time and environmental factors.A comparison is carried out in various observation modes(e.g.,tracking and scanning modes)to determine the flux density gain(G),revealing insignificant discrepancies in G among different ***-term monitoring data shows a linear correlation between G and atmospheric *** subtracting the G-Temperature dependence,the dispersion of G is reduced to~5%)when utilizing a constant G for calibration *** study will serve as a useful addition to the results provided by Jiang et *** measurement of G for the 19 beams of FAST,covering the frequency range 1000-1500 MHz,can be found on the Hi FAST homepage:https://***/fluxgain.

关键词： telescopes-techniques image processing-methods observational-radio continuum galaxies-cosmology observations

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Application of deep learning methods combined with physical background in wide field of view imaging atmospheric Cherenkov telescopes

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Nuclear Science and Techniques 2024年第4期35卷 208-220页

作者： Ao-Yan Cheng Hao Cai Shi Chen tian-Lu Chen Xiang Dong You-Liang Feng Qi Gao Quan-Bu Gou Yi-Qing Guo Hong-Bo Hu Ming-Ming Kang Hai-Jin Li Chen Liu Mao-Yuan Liu Wei Liu Fang-Sheng Min Chu-Cheng Pan bing-Qiang Qiao Xiang-Li Qian Hui-Ying Sun Yu-Chang Sun Ao-Bo Wang Xu Wang Zhen Wang Guang-Guang Xin Yu-Hua Yao Qiang Yuan Yi {2. school of physics and Technology Wuhan UniversityWuhan 430072China school of physics and {2. Yunnan UniversityKunming 650091China Ministry of Education The Key Laboratory of Cosmic Rays(Tibet University)Lhasa 850000China Key Laboratory of Particle Astrophysics Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China University of Chinese Academy of Sciences 19 A Yuquan RoadShijingshan DistrictBeijing 100049China College of physics Sichuan UniversityChengdu 610064China school of Intelligent Engineering Shandong Management UniversityJinan 250357China Tsung‑Dao Lee Institute Shanghai Jiao Tong UniversityShanghai 200240China Suzhou Aerospace Information Research Institute Suzhou 215123China College of physics Chongqing UniversityNo.55 Daxuecheng South RoadHigh‑tech DistrictChongqing 401331China Key Laboratory of Dark Matter and Space astronomy Purple Mountain ObservatoryChinese Academy of SciencesNanjing 210008China

The High Altitude Detection of Astronomical Radiation(HADAR)experiment,which was constructed in Tibet,China,combines the wide-angle advantages of traditional EAS array detectors with the high-sensitivity advantages of focused Cherenkov *** objective is to observe transient sources such as gamma-ray bursts and the counterparts of gravitational *** study aims to utilize the latest AI technology to enhance the sensitivity of HADAR *** datasets and models with distinctive creativity were constructed by incorporating the relevant physical theories for various *** models can determine the type,energy,and direction of the incident particles after careful *** obtained a background identification accuracy of 98.6%,a relative energy reconstruction error of 10.0%,and an angular resolution of 0.2.°in a test dataset at 10 *** findings demonstrate the significant potential for enhancing the precision and dependability of detector data analysis in astrophysical *** using deep learning techniques,the HADAR experiment’s observational sensitivity to the Crab Nebula has surpassed that of MAGIC and *** energies below 0.5 TeV and remains competitive with conventional narrow-field Cherenkov telescopes at higher *** addition,our experiment offers a new approach for dealing with strongly connected,scattered data.

关键词： VHE gamma-ray astronomy HADAR Deep learning Convolutional neural networks

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Electronic and topological properties of kagome lattice LaV3Si2

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钨科技(英文) 2023年第3期5卷 317-324页

作者： xue-Jiao Chen bing-Wen {2. Dong Han zhi-Cheng Zhong CAS Key Laboratory of Magnetic Materials Devices and Zhejiang Province Key Laboratory of Magnetic Materials and Application TechnologyNingbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201China Fujian Key Laboratory of Functional Marine Sensing Materials Center for Advanced Marine Materials and Smart SensorsCollege of Material and Chemical EngineeringMinjiang UniversityFuzhou 350108China Changchun Institute of Optics Fine Mechanics and physics Chinese Academy of SciencesChangchun 130033China China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China

Topological kagome lattice at the frontier of fundamental physics plays a key role in non-trivial topological quantum ***,we predict and investigate kagome lattice rare-earth vanadium-based quantum material LaV3Si2.sing density functional theory *** phonon spectrum and crystal transformation show stability of this material,which may be grown by experimental *** fermions,flat bands,and van Hove points as some basic features are presented in band structure and surface ***,symmetry-based compatibility relations support enforced semi-metal for occupied electron numbers with strong Berry *** results suggest that rare-earth vanadium-based RV3Si2.an be treated as a new family kagome lattice.

关键词： Vanadium Kagome lattice Rare earth Electronic Dirac points

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Space advanced technology demonstration satellite

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Science China(Technological Sciences) 2024年第1期67卷 240-258页

作者： zhang XiaoFeng CHEN Wen ZHU XiaoCheng MENG Na HE JunWang BI XingZi zhang YongHe SHI Qi LI Fei LIU Rui FENG ZhengGong LIU Liu LI JinSong WU HaiChen XU DongXiao LI TaiJie HUANG JiangJiang LIU Shuo LI {2.Tong YU XianSheng GAO Yang ZHOU Heng BAN HanYu zhang YanLi zhang YueTing YANG YingQuan HE Tao DUAN XuLiang CHEN Xin WANG YaMin SUN AnTai zhang KuoXiang SUN Ying WANG YaoBin FAN ChengCheng XIONG ShaoLin LI XinQiao WEN XiangYang LING zhiXing SUN XiaoJin zhang Chen BAI XianYong WANG ZhanShan DENG YuanYong {2. Hui YANG JianFeng xue HongBo SANG Peng LIU JinGuo ZHENG HuiLong ZHU Xiang HE JianWu LI Hui XU LuXiang XU ShuYan CHEN WenWu LIU ZhenDong WANG ZhaoLi MAO XiangLong GAO Rong LI ZongXuan DING GuoPeng WANG XinYu DOU RunJiang WENG LuBin LUO Hao WANG YaPing LIANG XianFeng FANG ZiRuo Innovation Academy for Microsatellites Chinese Academy of SciencesShanghai 201203China Institute of High Energy physics Chinese Academy of SciencesBeijing 100049China National Astronomical Observatory of China Beijing 100101China Shanghai Institute of Technical physics Chinese Academy of SciencesShanghai 200083China Institute of Precision Optical Engineering School of Physics Science and EngineeringTongji UniversityShanghai 200092China school of Earth and Space Sciences Peking UniversityBeijing 100871China Xi’an Institute of Optics and Precision Mechanics Chinese Academy of SciencesXi’an 710119China National Space Science Center Chinese Academy of SciencesBeijing 100190China Shenyang Institute of Automation Chinese Academy of SciencesShenyang 110016China Institute of Engineering Thermophysics Chinese Academy of SciencesBeijing 100190China Institute of Mechanics Chinese Academy of SciencesBeijing 100190China Shanghai Institute of Organic Chemistry Chinese Academy of SciencesShanghai 200032China Hangzhou Institute for Advanced Study University of Chinese Academy of SciencesHangzhou 310024China Nanyang Technological University Singapore 569830Singapore Dalian Institute of Chemical physics Chinese Academy of SciencesDalian 116023China Technical Institute of physics and Chemistry Chinese Academy of SciencesBeijing 100049China Changchun Institute of Optics Fine Mechanics and PhysicsChinese Academy of SciencesChangchun 130033China Institute of Semiconductors Chinese Academy of SciencesBeijing 100083China Institute of Automation Chinese Academy of SciencesBeijing 100190China school of Aeronautics and Astronautics Zhejiang UniversityHangzhou 310058China

The Space Advanced Technology demonstration satellite(SATech-01),a mission for low-cost space science and new technology experiments,organized by Chinese Academy of Sciences(CAS),was successfully launched into a Sun-synchronous orbit at an altitude of~500 km on July 2.,2.2.,from the Jiuquan Satellite Launch *** as an experimental platform for space science exploration and the demonstration of advanced common technologies in orbit,SATech-01 is equipped with 16 experimental payloads,including the solar upper transition region imager(SUTRI),the lobster eye imager for astronomy(LEIA),the high energy burst searcher(HEBS),and a High Precision Magnetic Field Measurement System based on a CPT Magnetometer(CPT).It also incorporates an imager with freeform optics,an integrated thermal imaging sensor,and a multi-functional integrated imager,*** paper provides an overview of SATech-01,including a technical description of the satellite and its scientific payloads,along with their on-orbit performance.

关键词： SATech-01 spacecraft design scientific instruments on-orbit performance

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