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Superconductivity in Cubic La_(3)Al with Interstitial Anionic Electrons

Chinese physics Letters 2025年第2期42卷 88-97页

作者： Zhijun Tu Peihan Sun Donghan Jia Huiyang Gou Kai Liu Hechang Lei School of Physics and Beijing Key Laboratory of Optoelectronic Functional Materials&MicroNano Devices Renmin University of ChinaBeijing 100872China Key Laboratory of Quantum State Construction and Manipulation(Ministry of Education) Renmin University of ChinaBeijing 100872China Department of Physics School of ScienceHebei University of Science and TechnologyShijiazhuang 050018China Center for High Pressure Science and Technology Advanced Research Beijing 100193China

We observed superconductivity in a cubic La_(3)Al single crystal that exhibits metallic behavior in the normal state without an observable structural transition and enters the superconducting state below T_(c)~6.32 *** characterization and analysis indicate that cubic La_(3)Al is a bulk type-Ⅱ BCS ***,theoretical calculations show that it can host interstitial anionic electrons located at the body center of the cubic unit cell,which confirms electron-phonon coupling as the superconducting ***,cubic La_(3)Al can be considered as a novel electride superconductor.

关键词： mechanism cubic

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Improved Plasticity of Fe_(25)Co_(25)Ni_(25)(Si_(0.3)B_(0.7))_(25) High Entropy Bulk Metallic Glass through the Addition of Cu

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Acta Metallurgica Sinica(English Letters) 2023年第3期36卷 417-425页

作者： Xueru Fan Lei Xie Qiang Li Chuntao Chang Hongxiang Li School of Physics Science and Technology Xinjiang UniversityUrumqi 830046China School of Mechanical Engineering Dongguan University of TechnologyDongguan 523808China State Key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing 100083China

This work was focused on enhancement in the plasticity of Fe_(25)Co_(25)Ni_(25)(Si_(0.3)B_(0.7))_(25) high entropy bulk metallic glass(HE-BMG)by adding minor Cu(0–1.2,in at.%).It is found that the appropriate addition of Cu can efficiently improve the plasticity of the present HE-BMG while the excessive addition of Cu will deteriorate again the plasticity,and especially,the plastic strain of the present HE-BMG is improved from 0.8%for the Cu-free alloy to 4.7%for the 0.3 at.%Cu-added *** transmission electron microscopy observation shows that there are manyα-Fe(Co,Ni)clusters with sizes of less than 5 nm dispersed in the glassy matrix in the 0.3 and 0.6 at.%Cu-added alloys,which may account for the significant improvement in the plasticity of the two alloys,and further increase in Cu content more than 0.9 at.%leads to the precipitation ofα-Fe(Co,Ni)and Fe(Co,Ni)B compound grains with diameters of tens of nanometers,in which the plasticity of the present HE-BMGs has deteriorated rapidly.

关键词： High entropy alloys Bulk metallic glasses Glass forming ability Nano-crystallization Plasticity Microstructure

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Effect of attack angle on the electromagnetic wave transmission characteristics in the hypersonic plasma sheath of a re-entry vehicle

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Plasma science and technology 2024年第12期26卷 49-62页

作者： Xin AI Qiuyue NIE Zhonglin ZHANG Peiqi CHEN Shulei ZHENG Changshi YAN Guoqiang WEI School of Electrical Engineering and Automation Harbin Institute of TechnologyHarbin 150001People’s Republic of China Laboratory for Space Environment and Physical Sciences Harbin Institute of TechnologyHarbin 150001People’s Republic of China School of Physics Harbin Institute of TechnologyHarbin 150001People’s Republic of China

The attack angle may greatly affect the hypersonic plasma sheaths around the re-entry vehicle,thereby affecting the transmission characteristics of electromagnetic(EM)waves in the *** this paper,we propose an integrated three-dimensional(3D)model with various attack angles and realistic flying conditions of radio attenuation measurement C-II(RAM C-II)re-entry tasks for analyzing the effect of the attack angle on the transmission characteristics of EM waves in the *** is shown that the electron density and collision frequency of the sheath on the windward side can be increased by an order of magnitude with the increase of the attack ***,the thickness of the sheath on the leeward side is increased where the electron density and collision frequency are *** EM waves are mainly reflected on the windward plasma sheath due to the cutoff effect,and the radio-frequency(RF)blackout is mitigated if the antenna is positioned on the leeward ***,by planning the trajectory properly and installing the antenna accordingly during the re-entry,it is possible to provide an approach for mitigation of the RF blackout problem to an extent.

关键词： attack angle hypersonic plasma sheath re-entry vehicle transmission characteristics

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Temperature-free mass tracking of a levitated nanoparticle

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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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Practical GHz single-cavity all-fiber dual-comb laser for high-speed spectroscopy

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光：科学与应用（英文版） 2025年第5期14卷 1354-1363页

作者： Lin Ling Wei Lin Zhaoheng Liang Minjie Pan Chiyi Wei Xuewen Chen Yang Yang Zhijin Xiong Yuankai Guo Xiaoming Wei Zhongmin Yang School of Physics and Optoelectronics South China University of TechnologyGuangzhouChina School of Physics and Optoelectronics South China University of TechnologyGuangzhouChina School of Materials Science and Engineering Guangdong Engineering Technology Research and Development Center of Special Optical Fiber Materials and Devices Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques South China University of TechnologyGuangzhouChina School of Physics and Optoelectronics South China University of TechnologyGuangzhouChina School of Materials Science and Engineering Guangdong Engineering Technology Research and Development Center of Special Optical Fiber Materials and Devices Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques South China University of TechnologyGuangzhouChina Research Institute of Future Technology South China Normal UniversityGuangzhouChina

Dual-comb spectroscopy(DCS)with few-GHz tooth spacing that provides a better trade-off between spectral resolution and refresh rate is a powerful tool for measuring and analyzing rapidly evolving transient *** such an exciting opportunity,existing technologies compromise either the spectral resolution or refresh rate,leaving few-GHz DCS with robust design largely unmet for frontier *** this work,we demonstrate a novel GHz DCS by exploring the multimode interference-mediated spectral filtering effect in an all-fiber ultrashort cavity *** GHz single-cavity all-fiber dual-comb source is seeded by a dual-wavelength mode-locked fiber laser operating at fundamental repetition rates of about 1.0 GHz differing by 148 kHz,which has an excellent stability in the free-running state that the Allan deviation is only 101.7 mHz for an average time of 1 *** to the large repetition rate difference between the asynchronous dichromatic pulse trains,the GHz DCS enables a refresh time as short as 6.75 μs,making it promising for studying nonrepeatable transient phenomena in real *** this end,the practicality of the present GHz DCS is validated by successfully capturing the'shock waves'of balloon and firecracker explosions *** GHz single-cavity all-fiber dual-comb system promises a noteworthy improvement in acquisition speed and reliability without sacrificing measurement accuracy,anticipated as a practical tool for high-speed applications.

关键词： laser all-fiber dual-comb high-speed practical single-cavity spectroscopy

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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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