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Temperature-free mass tracking of a levitated nanoparticle

Chinese physics B 2023年第7期32卷 171-176页

作者：田原郑瑜刘吕航郭光灿孙方稳 CAS Key Laboratory of Quantum Information University of Science and Technology of ChinaHefei 230026China CAS Center for Excellence in Quantum Information and Quantum Physics University of Science and Technology of ChinaHefei 230026China

Mass measurement is an essential analytical tool in the characterization of *** we present a method for measuring the mass of an individual nanoparticle which has a fg-level *** method enables a temperatureindependent mass measurement with the assistance of a sinusoidal electrostatic driving *** this approach,we successfully track the change in properties of an optically levitated nanoparticle,such as mass,temperature,and electric charge,with air *** abrupt change in the mass of silica nanoparticles is found to violate the Zhuravlev *** method can be utilized to extend the mass analysis of materials,such as thermogravimetric analysis,to individual microor nano-particles.

关键词： optical levitation nanoparticle mass measurement thermal desorption

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FPGA based hardware platform for trapped-ion-based multi-level quantum systems

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Chinese physics B 2023年第9期32卷 42-50页

作者：朱明东闫林秦熙张闻哲林毅恒杜江峰 CAS Key Laboratory of Microscale Magnetic Resonance and School of Physical Sciences University of Science and Technology of ChinaHefei 230026China CAS Center for Excellence in Quantum Information and Quantum Physics University of Science and Technology of ChinaHefei 230026China Hefei National Laboratory University of Science and Technology of ChinaHefei 230088China

We report a design and implementation of a field-programmable-gate-arrays(FPGA)based hardware platform,which is used to realize control and signal readout of trapped-ion-based multi-level quantum *** platform integrates a four-channel 2.8 Gsps@14 bits arbitrary waveform generator,a 16-channel 1 Gsps@14 bits direct-digital-synthesisbased radio-frequency generator,a 16-channel 8 ns resolution pulse generator,a 10-channel 16 bits digital-to-analogconverter module,and a 2-channel proportion integration differentiation *** hardware platform can be applied in the trapped-ion-based multi-level quantum systems,enabling quantum control of multi-level quantum system and highdimensional quantum *** platform is scalable and more channels for control and signal readout can be implemented by utilizing more parallel duplications of the *** hardware platform also has a bright future to be applied in scaled trapped-ion-based quantum systems.

关键词： FPGA hardware platform trapped-ion multi-level quantum system

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Experimental Study on Cooling Down Process of a Nitrogen-Charged Cryogenic Loop Heat Pipe

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Journal of Thermal science 2023年第1期32卷 153-165页

作者： ZHAO Ya'nan YAN Tao LIANG Jingtao Key Laboratory of Space Energy Conversion Technology Technical Institute of Physics and ChemistryChinese Academyof SciencesBeijing 100190China School of Engineering Science University of Chinese Academy of SciencesBeijing 100049China

Cryogenic loop heat pipes are highly efficient heat transfer devices at cryogenic temperature range,which have promising application prospects in satellites,spacecrafts,electronics,and so *** down process is a most critical process for a CLHP before *** present,secondary loop is a major way for a CLHP to fulfil cooling down and most studies are concentrated on heat transfer characteristics during normal ***,few investigations have been carried out on the cooling down *** this paper,the cooling down process of a nitrogen-charged CLHP assisted with a secondary loop was experimentally investigated.A simple qualitative approach to estimate the cooling down time was proposed according to the law of conservation of *** two flow paths of the working fluid in the CLHP during the cooling down process were *** studies on the cooling down process with various secondary heat loads and working fluid inventory were presented in *** the increase of secondary heat load,the elapsed time of Stage III decreased significantly due to the larger mass flow rate in Path *** addition,the effect of the working fluid inventory on the cooling down time was generally small in the range from 2.99 MPa to 3.80 ***,with 2.80 MPa working fluid inventory,it required much longer cooling down time,which was because of the lack of liquid in the CLHP with low working fluid ***,the influence of gravity on the temperature variation of the components during the experiments was *** work is beneficial for better understanding of the cooling down process and optimizing of CLHPs.

关键词： cryogenic loop heat pipe secondary loop cooling down heat transfer

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Quantum-mechanical understanding on structure dependence of image potentials of single-walled boron nitride nanotubes

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Chinese physics B 2024年第12期33卷 467-475页

作者： Yu Zhang Zhiman Zhang Weiliang Wang Shaolin Zhang Haiming Huang Solid State Physics&Material Research Laboratory School of Physics and Materials ScienceGuangzhou UniversityGuangzhou 510006China Research Center for Advanced Information Materials(CAIM) Huangpu Research and Graduate School of Guangzhou UniversityGuangzhou 510555China School of Physics Guangdong Province Key Laboratory of Display Material and TechnologyCenter for Neutron Science and TechnologySun Yat-sen UniversityGuangzhou 510275China

The recent discovery of field emission devices based on one-dimensional nanostructures has attracted much interest in emerging applications on next-generation flat panel displays,molecule-based sensors,and so *** achieve a comprehensive understanding of surface potentials at the nano-emitters during the tunneling process,in this study we systematically investigated the image potentials of single-walled boron nitride nanotubes with different edges,diameters and lengths in the frame of a composite first-principles *** image potentials of zigzag single-walled boron nitride nanotubes are found to be dependent on the non-equivalent *** the image potentials of isolated armchair single-walled boron nitride nanotube can be well fitted with the image potential of an ideal metal sphere of a size comparable to the tube *** the contrary,the image potentials of zigzag and grounded armchair single-walled boron nitride nanotubes exhibit a strong length-dependence characteristic and are significantly different from that of an ideal metal sphere,which originates from the significant axial symmetry breaking of induced charge at the tip for the long *** correlation between the testing electron and electronic structure of single-walled boron nitride nanotube has also been discussed.

关键词： boron nitride nanotubes quantum chemistry image potentials structure dependence

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Design of a high-dynamic-range prototype readout system for VLAST calorimeter

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Nuclear science and Techniques 2023年第10期34卷 47-59页

作者： Qiang Wan Jian-Hua Guo Xing Xu Shen Wang Yong-Qiang Zhang Yi-Ming Hu Yan Zhang Xu Pan Xiang Li Chuan Yue Wei Jiang Yu-Xin Cui Deng-Yi Chen Key Laboratory of Dark Matter and Space Astronomy Purple Mountain ObservatoryChinese Academy of SciencesNanjing 210023China School of Astronomy and Space Science University of Science and Technology of ChinaHefei 230026China

In the future, the Very Large Area gamma-ray space Telescope is expected to observe high-energy electrons and gamma rays in the MeV to TeV range with unprecedented acceptance. As part of the detector suite, a high-energy imaging calorimeter(HEIC) is currently being developed as a homogeneous calorimeter that utilizes long bismuth germanate(BGO) scintillation crystals as both absorbers and detectors. To accurately measure the energy deposition in the BGO bar of HEIC, a highdynamic-range readout method using a silicon photomultiplier(SiPM) and multiphotodiode(PD) with different active areas has been proposed. A prototype readout system that adopts multichannel charge measurement ASICs was also developed to read out the combined system of SiPMs and PDs. Preliminary tests confirmed the feasibility of the readout scheme, which is expected to have a dynamic range close to 10~6.

关键词： VLAST Calorimeter Readout system Front-end electronics Large dynamic range

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Lightning-induced neutrons as a possible source of charged particles in the Earth's inner radiation belt

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Earth and Planetary physics 2025年第2期9卷 444-451页

作者： QuanQi Shi ChenYao Han Qiu-Gang Zong Alexander Degeling Shuo Wang SuiYan Fu PengZhi He Shandong Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment School of Space Science and TechnologyInstitute of Space SciencesShandong UniversityWeihai Shandong 264209China School of Earth and Space Sciences Peking UniversityBeijing 100871China WeiHai Research Institute of Industrial Technology of Shandong University Weihai Shandong 264209China

The Van Allen radiation belts are doughnut-shaped zones surrounding Earth, filled with highly energetic charged particles whose sources or loss mechanisms have been investigated for decades. As for the inner belt, cosmic ray albedo neutron decay(CRAND),radial diffusion, and local acceleration have been considered principal sources of electrons, whereas protons are predominantly from CRAND and solar protons. In this article, lightning-induced neutrons from Earth's upper atmosphere are suggested as a possible source of protons and electrons in the inner radiation belt. These terrestrial neutrons can contribute to the inner belt population by undergoing nuclear decay. Several approaches are proposed and discussed to evaluate the potential contribution of lightning-induced neutrons to the inner belt, including magnitude estimation, Monte Carlo simulations, and in situ observations. This article discusses some avenues of further study to determine the contribution of lightning-induced neutrons to the inner radiation belt.

关键词： Van Allen radiation belts cosmic ray albedo neutron decay(CRAND) lightning neutrons

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Sustainable all-weather CO2 utilization by mimicking natural photosynthesis in a single material

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National science Review 2024年第2期11卷 177-187页

作者： Xianjin Shi Yu Huang Ran Long Zhenyu Wang Liqin Wang Junji Cao Gangqiang Zhu Yujie Xiong State Key Laboratory of Loess and Quaternary Geology(SKLLQG) Key Laboratory of Aerosol Chemistry and Physics Institute of Earth EnvironmentChinese Academy of Sciences Center of Excellence in Quaternary Science and Global Change Chinese Academy of Sciences University of Chinese Academy of Sciences Hefei National Research Center for Physical Sciences at the Microscale School of Chemistry and Materials Science and National Synchrotron Radiation Laboratory University of Science and Technology of China Institute of Atmospheric Physics Chinese Academy of Sciences School of Physics and Information Technology Shaanxi Normal University

Solar-driven CO2conversion into hydrocarbon fuels is a sustainable approach to synchronously alleviating the energy crisis and achieving net ***,the dependence of the conversion process on solar illumination hinders its practical application due to the intermittent availability of sunlight at night and on cloudy or rainy ***,we report a model material of Pt-loaded hexagonal tungsten trioxide（Pt/h-WO3） for decoupling light and dark reaction processes,demonstrating the sustainable CO2conversion under dark conditions for the first *** such a material system,hydrogen atoms can be produced by photocatalytic water splitting under solar illumination,stored together with electrons in the h-WO3through the transition of W6+to W5+and spontaneously released to trigger catalytic CO2reduction under dark ***,we demonstrate using natural light that CH4production can persist at night and on rainy days,proving the accomplishment of all-weather CO2conversion via a sustainable way.

关键词： sustainable CO2 utilization artificial photosynthesis all-weather application charge storage

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Wide-angle Scanning and Beam Optimization of Circularly Polarized Hemispherical Phased Array Antennas

Wide-angle Scanning and Beam Optimization of Circularly Pola...

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2024 International Applied Computational Electromagnetics Society Symposium, ACES-China 2024

作者： Wu, S.Y. Gu, P.F. Song, D.W. Wang, J.X. Fan, Z.H. Ding, D.Z. Nanjing University of Science and Technology Department of Communication Engineering Nanjing210094 China China Academy of Space Technology National Key Laboratory of Science and Technology on Space Microwave Xi'an China

ISBN: (纸本)9798350355581

Conformal phased arrays have received continuous attention from scholars due to their excellent beam scanning performance. In this paper, a circularly polarized hemispherical phased array is designed to achieve half-space beam scanning. The active element patterns (AEP) for each array element are extracted, and beam synthesis of the spherical array is conducted considering mutual coupling. The numerical experimental results are in good agreement with the High Frequency Structure Simulator (HFSS) simulation results, validating the effectiveness of the method. For conformal arrays, not all antenna elements contribute to the main beam, so it is necessary to determine which antenna elements are active and which are inactive. An adaptive evolution strategy based on the covariance matrix adaptation evolution strategy (CMA-ES) is employed to optimize the excitation phases of working antenna elements, greatly reducing side lobe level (SLL). © 2024 IEEE.

关键词： Antenna phased arrays

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Manipulating Hubbard-type Coulomb blockade effect of metallic wires embedded in an insulator

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National science Review 2023年第3期10卷 127-133页

作者： Xing Yang Zhao-Long Gu Huimin Wang Jing-Jing Xian Sheng Meng Naoto Nagaosa Wen-Hao Zhang Hai-Wen Liu Zi-Heng Ling Kai Fan Zhi-Mo Zhang Le Qin Zhi-Hao Zhang Yan Liang Jian-Xin Li Ying-Shuang Fu School of Physics and Wuhan National High Magnetic Field Center Huazhong University of Science and Technology National Laboratory of Solid State Microstructures and Department of Physics Nanjing University Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of Sciences RIKEN Center for Emergent Matter Science(CEMS) Department of Applied Physics University of Tokyo Center for Advanced Quantum Studies Department of Physics Beijing Normal University Collaborative Innovation Center of Advanced Microstructures Nanjing University Hubei Key Laboratory of Gravitation and Quantum Physics Huazhong University of Science and Technology Wuhan Institute of Quantum Technology

Correlated states have emerged in low-dimensional systems owing to enhanced Coulomb *** these states requires atomic-scale characterization and delicate control ***,spectroscopic imaging-scanning tunneling microscopy was employed to investigate the correlated states residing in 1D electrons of the monolayer and bilayer MoSe2 mirror twin boundary(MTB).The Coulomb energies,determined by the wire length,drive the MTB into two types of ground states with distinct respective out-of-phase and in-phase charge *** two ground states can be reversibly converted through a metastable zero-energy state with in situ voltage pulses,which tune the electron filling of the MTB via a polaronic process,substantiated by first-principles *** Hubbard model calculation with an exact diagonalization method reveals the ground states as correlated insulators from an on-site U-originated Coulomb interaction,dubbed the Hubbard-type Coulomb blockade *** study lays a foundation for understanding and tailoring correlated physics in complex systems.

关键词： STM one-dimensional Coulomb effect electron correlation Hubbard

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Limiting Magnitudes of the Wide Field Survey Telescope(WFST)

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Research in Astronomy and Astrophysics 2023年第3期23卷 111-118页

作者：雷磊朱青峰孔旭王挺贵郑宪忠师冬冬范璐璐刘伟 School of Astronomy and Space Science University of Science and Technology of ChinaHefei 230026China Purple Mountain Observatory Chinese Academy of SciencesNanjing 210023China Deep Space Exploration Laboratory/Department of Astronomy University of Science and Technology of ChinaHefei 230026China

Expected to be of the highest survey power telescope in the northern hemisphere,the Wide Field Survey Telescope(WFST)will begin its routine observations of the northern sky since *** will produce a lot of scientific data to support the researches of time-domain astronomy,asteroids and the solar system,galaxy formation and cosmology and so *** estimated that the 5σlimiting magnitudes of WFST with 30 s exposure are u=22.31mag,g=23.42 mag,r=22.95 mag,i=22.43 mag,z=21.50 mag,w=23.61 *** above values are calculated for the conditions of airmass=1.2,seeing=075,precipitable water vapor=2.5 mm and Moon-object separation=45°at the darkest New Moon night of the Lenghu site(V=22.30 mag,Moon phaseθ=0°).The limiting magnitudes in different Moon phase conditions are also *** calculations are based on the empirical transmittance data of WFST optics,the vendor provided CCD quantum efficiency,the atmospherical model transmittance and spectrum of the *** the absence of measurement data such as sky transmittance and spectrum,we use model data.

关键词： limiting galaxy routine

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