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Topological surface states in γ-PtBi2 evidenced by scanning tunneling microscopy

Science bulletin 2025年

作者： Yunkai Guo Jingming Yan Wen-Han Dong Yongkai Li Yucong Peng Xuetao Di Caizhen Li Zhiwei Wang Yong Xu Peizhe Tang Yugui Yao Wenhui Duan Qi-Kun Xue Wei Li State Key Laboratory of Low-Dimensional Quantum Physics Department of Physics Tsinghua University Beijing 100084 China Frontier Science Center for Quantum Information Beijing 100084 China. Centre for Quantum Physics Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement Ministry of Education School of Physics Beijing Institute of Technology Beijing 100081 China. Centre for Quantum Physics Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement Ministry of Education School of Physics Beijing Institute of Technology Beijing 100081 China Beijing Key Lab of Nanophotonics and Ultrafine Optoelectronic Systems Beijing Institute of Technology Beijing 100081 China International Center for Quantum Materials Beijing Institute of Technology Zhuhai 519000 China. International Center for Quantum Materials Beijing Institute of Technology Zhuhai 519000 China. Electronic address: zhiweiwang@***. School of Materials Science and Engineering Beihang University Beijing 100191 China. Frontier Science Center for Quantum Information Beijing 100084 China Beijing Academy of Quantum Information Sciences Beijing 100193 China Southern University of Science and Technology Shenzhen 518055 China Hefei National Laboratory Hefei 230088 China. Electronic address: qkxue@***. Hefei National Laboratory Hefei 230088 China. Electronic address: weili83@***.

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Dynamic response analysis and blade stiffness sensitivity study of large floating offshore wind turbine with coupling effect

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Renewable Energy 2025年

作者： Xiaohang Qian Zhiteng Gao Yibin He Leqi Song Jian Hu Lijun Zhang Tongguang Wang Ye Li Department of Ocean Science and Engineering Southern University of Science and Technology Shenzhen 518055 China Institute of Energy Science College of Engineering Shantou University Shantou 515063 China College of Metrology Measurement and Instrument China Jiliang University Hangzhou 310000 China Laboratory of Multi-function Towing Tank State Key Laboratory of Ocean Engineering School of Naval Architecture Ocean & Civil Engineering Shanghai Jiao Tong University Shanghai 200240 China Jiangsu Key Laboratory of Hi-Tech Research for Wind Turbine Design Nanjing University of Aeronautics and Astronautics Nanjing 210016 China School of Engineering The University of Edinburgh Edinburgh EH9 3JL United Kingdom Department of Civil and Mechanical Engineering Technical University of Denmark Nils Koppels Allé Kgs 2800 Kgs. Lyngby Denmark Department of Wind and Energy Systems Technical University of Denmark Nils Koppels Allé Kgs 2800 Kgs. Lyngby Denmark

The rise in offshore wind energy deployment has driven the design of larger blades, creating a trade-off between structural optimization and economic feasibility. To investigate the interaction between structural and sub-component responses in offshore floating wind turbine blades, a multi-body dynamics method, geometrically exact beam theory, and coupled blade element momentum theory were employed. A dynamic model was developed to assess the dynamic response of the 15 MW floating wind turbine under steady wind conditions. The geometrically exact beam theory accounts for the complete 6×6 stiffness matrix and incorporates sensitivity analysis factors to quantify the influence of all stiffness components on the response of each sub-component. The results indicate that, for the principal diagonal stiffness, torsional stiffness has a significant impact on the response, with a sensitivity factor of −100 concerning the blade tip’s twist angle fluctuation. For the coupling stiffness, the torsion-bending coupling stiffness induces considerable divergence in the response, with its sensitivity factor reaching −657.22 for twist angle fluctuations. The six-degree-of-freedom platform motion intensifies the coupling of the torsion-bending coupling stiffness with blade dynamics, leading to amplified response fluctuations and vibration divergence.

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Observation of a transition in the dynamics of strong-field atomic excitation

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Physical Review A 2020年第4期102卷 043104-043104页

作者： SongPo Xu MingQing Liu ShiLin Hu Zheng Shu Wei Quan ZhiLei Xiao Yu Zhou MingZheng Wei Meng Zhao RenPing Sun YanLan Wang LinQiang Hua Cheng Gong XuanYang Lai Jing Chen XiaoJun Liu State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics Wuhan Institute of Physics and Mathematics Innovation Academy for Precision Measurement Science and Technology Chinese Academy of Sciences Wuhan 430071 China University of Chinese Academy of Sciences Beijing 100049 China Institute of Applied Physics and Computational Mathematics P. O. Box 8009 Beijing 100088 China HEDPS Center for Applied Physics and Technology Peking University Beijing 100084 China Guangdong Provincial Key Laboratory of Quantum Metrology and Sensing School of Physics and Astronomy Sun Yat-Sen University (Zhuhai Campus) Zhuhai 519082 China Center for Advanced Material Diagnostic Technology College of Engineering Physics Shenzhen Technology University Shenzhen 518118 China

The consensus on the mechanism of atomic excitation in an intense laser field has not been reached so far because the proposed mechanisms may dominate in different regimes. In this paper, we show a clear transition of the underlying physical mechanism of strong-field atomic excitation from multiphoton resonance to coherent recapture by investigating the intensity dependence of the yields of neutral excited atoms (Ar*) and singly charged ions (Ar+) of argon experimentally and theoretically. Our results indicate that, for 400 nm, the multiphoton resonance mechanism plays a significant role at low intensity and coherent recapture mechanism becomes important at high intensity. While for 800 nm, distinctive out-of-phase oscillations of Ar* and Ar+ yields are identified, implying that coherent recapture mechanism dominates. Our work provides a more comprehensive understanding of the atomic excitation mechanism in an intense laser field.

关键词： Multiphoton or tunneling ionization & excitation Ultrafast phenomena

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Strong-field frustrated double ionization of argon atoms

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Physical Review A 2020年第2期102卷 023103-023103页

作者： Shi Chen Jing Chen Gerhard G. Paulus HuiPeng Kang School of Physics Peking University Beijing 100871 China Center for Applied Physics and Technology HEDPS and College of Engineering Peking University Beijing 100871 China Institute of Applied Physics and Computational Mathematics P.O. Box 8009 Beijing 100088 China Center for Advanced Material Diagnostic Technology College of Engineering Physics Shenzhen Technology University Shenzhen 518118 China Institute of Optics and Quantum Electronics Friedrich Schiller University Jena Max-Wien-Platz 1 07743 Jena Germany Helmholtz Institut Jena Frötbelstieg 3 07743 Jena Germany State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics Wuhan Institute of Physics and Mathematics Innovation Academy for Precision Measurement Science and Technology Chinese Academy of Sciences Wuhan 430071 China

Using a three-dimensional semiclassical method, we theoretically investigate frustrated double ionization (FDI) of Ar atoms subjected to strong laser fields. The double-hump photoelectron momentum distribution generated from FDI observed in a recent experiment [S. Larimian et al., Phys. Rev. Research 2, 013021 (2020)] is reproduced by our simulation. We confirm that the observed spectrum is due to recollision. The laser intensity dependence of FDI is investigated. We reveal that the doubly excited states of Ar atoms and excited states of Ar+ are the dominant pathways for producing FDI at relatively low and high intensities, respectively. The information of which pathway leads to FDI is encoded in the electron momentum distributions. Our work demonstrates that FDI is a general strong-field physical process accompanied with nonsequential double ionization and it can be well understood within the context of recollision scenario.

关键词： Atomic & molecular processes in external fields Multiphoton or tunneling ionization & excitation

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Design of Automatic Controller System for Three Axis 3D Printing Platform

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Journal of Physics: Conference Series 2021年第1期2095卷

作者： Hongwei Ren Yongchao Luan Xingkun Dong Haijun Zhou Xin Chen Xiaochuan Yu School of Electrical Engineering University of Jinan Jinan China College of Civil and Transportation Engineering Shenzhen University Shenzhen China Shandong Provincial Key Laboratory of Preparation and Measurement of Building Materials University of Jinan Jinan China Shandong Junyu Electronic Technology Co. LTD Linyi China

With the development of society and the continuous improvement of the level of automation, automatic three-dimensional work platform is more and more popular, but now the three-dimensional work platform has a single function, and the waste of capacity is a serious problem. Therefore, this paper uses STM32F429 MCU to design a set of replaceable working position of the three axis control platform. The design of the table with replaceable work head, by identifying the ID on the head, change the control mode, enhance the functional diversity of the three-axis platform. In addition, in order to improve the universality of the system, the platform has many external communication interfaces, visual man-machine interface and LAN network communication functions.

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Dynamic chloride ion adsorption on single iridium atom boosts seawater oxidation catalysis

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Nature communications 2024年第1期15卷 1973页

作者： Xinxuan Duan Qihao Sha Pengsong Li Tianshui Li Guotao Yang Wei Liu Ende Yu Daojin Zhou Jinjie Fang Wenxing Chen Yizhen Chen Lirong Zheng Jiangwen Liao Zeyu Wang Yaping Li Hongbin Yang Guoxin Zhang Zhongbin Zhuang Sung-Fu Hung Changfei Jing Jun Luo Lu Bai Juncai Dong Hai Xiao Wen Liu Yun Kuang Bin Liu Xiaoming Sun State Key Laboratory of Chemical Resource Engineering Beijing Advanced Innovation Center for Soft Matter Science and Engineering College of Chemistry Beijing University of Chemical Technology Beijing 100029 PR China. School of Chemistry Chemical Engineering and Biotechnology Nanyang Technological University Singapore 637459 Singapore. Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Colloid Interface and Chemical Thermodynamics Institute of Chemistry Chinese Academy of Sciences Beijing 100190 PR China. Ocean Hydrogen Energy R&D Center Research Institute of Tsinghua University in Shenzhen Shenzhen 518057 PR China. State Key Lab of Organic-Inorganic Composites College of Chemical Engineering Beijing University of Chemical Technology 100029 Beijing PR China. Energy & Catalysis Center School of Materials Science & Engineering Beijing Institute of Technology Beijing 100081 PR China. Hefei National Research Center for Physical Sciences at the Microscale University of Science and Technology of China Hefei 230026 PR China. Beijing Synchrotron Radiation Facility Institute of High Energy Physics Chinese Academy of Sciences 100049 Beijing PR China. Department of Chemistry Tsinghua University 100084 Beijing PR China. Department of Materials Science and Engineering City University of Hong Kong Hong Kong SAR 999077 PR China. College of Energy Shandong University of Science and Technology Tsingtao 266590 PR China. Beijing Key Laboratory of Energy Environmental Catalysis Beijing University of Chemical Technology 100029 Beijing PR China. Department of Applied Chemistry and Center for Emergent Functional Matter Science National Yang Ming Chiao Tung University Hsinchu 300 Taiwan. School of Materials Science and Engineering Tianjin Key Lab of Photoelectric Materials & Devices Tianjin University of Technology Tianjin 300384 PR China. ShenSi Lab Shenzhen Institute for Advanced Study University of Electronic Science and Technology of China Shen

Seawater electrolysis offers a renewable, scalable, and economic means for green hydrogen production. However, anode corrosion by Cl pose great challenges for its commercialization. Herein, different from conventional catalysts designed to repel Cl adsorption, we develop an atomic Ir catalyst on cobalt iron layered double hydroxide (Ir/CoFe-LDH) to tailor Cl adsorption and modulate the electronic structure of the Ir active center, thereby establishing a unique Ir-OH/Cl coordination for alkaline seawater electrolysis. Operando characterizations and theoretical calculations unveil the pivotal role of this coordination state to lower OER activation energy by a factor of 1.93. The Ir/CoFe-LDH exhibits a remarkable oxygen evolution reaction activity (202 mV overpotential and TOF = 7.46 O s) in 6 M NaOH+2.8 M NaCl, superior over Cl-free 6 M NaOH electrolyte (236 mV overpotential and TOF = 1.05 O s), with 100% catalytic selectivity and stability at high current densities (400-800 mA cm) for more than 1,000 h.

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Rapid Whole Slide Imaging via Learning-based Two-shot Virtual Autofocusing

arXiv

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arXiv 2020年

作者： Li, Qiang Liu, Xianming Han, Kaige Guo, Cheng Ji, Xiangyang Wu, Xiaolin School of Computer Science and Technology Harbin Institute of Technology Harbin150001 China Peng Cheng Laboratory Shenzhen518052 China School of Measurement Science Harbin Institute of Technology Harbin150001 China Department of Automation Tsinghua University Beijing100084 China Department of Electrical and Computer Engineering McMaster University HamiltonONL8S 4L8 Canada School of Electronic Information and Electrical Engineering Shanghai Jiao Tong University Shanghai200240 China

—Whole slide imaging (WSI) is an emerging technology for digital pathology. The process of autofocusing is the main influence of the performance of WSI. Traditional autofocusing methods either are time-consuming due to repetitive mechanical motions, or require additional hardware and thus are not compatible to current WSI systems. In this paper, we propose the concept of virtual autofocusing, which does not rely on mechanical adjustment to conduct refocusing but instead recovers in-focus images in an offline learning-based manner. With the initial focal position, we only perform two-shot imaging, in contrast traditional methods commonly need to conduct as many as 21 times image shooting in each tile scanning. Considering that the two captured out-of-focus images retain pieces of partial information about the underlying in-focus image, we propose a U-Net-inspired deep neural network based approach for fusing them into a recovered in-focus image. The proposed scheme is fast in tissue slides scanning, enabling a high-throughput generation of digital pathology images. Experimental results demonstrate that our scheme achieves satisfactory refocusing performance. Copyright © 2020, The Authors. All rights reserved.

关键词： Deep neural networks

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A Novel Non-Cooperative Pose measurement Method For Triangular Feature With Unknown Space Size 36

A Novel Non-Cooperative Pose Measurement Method For Triangul...

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第36届中国控制会议

作者： Jun Yang Shunzhi Li Xueqian Wang Zhiheng Li Xuehai Gao Bin Liang National Laboratory for Information Science and Technology Tsinghua University Graduate School at Shenzhen Tsinghua University Shenzhen Laboratory of Space Robotics & Telescience Shenzhen Engineering Laboratory of Geometry Measurement Technology

ISBN: (纸本)9781538629185

In this paper,a novel method for measuring the relative pose of the triangular feature with unknown size is proposed by introducing line structured ***,the coordinate system model is established,and the relative relationship between each coordinate system is given;Secondly,by using the isosceles property of the triangular bracket and the line structured light constraint,three vertices' coordinates of the triangular feature and two intersection points between line structured light and the triangular feature are calculated in the camera coordinates;Then,the transfer matrix between the camera coordinate system and the world coordinate system is calculated by using the five feature points,and the transfer matrix is decomposed to obtain the relative position and attitude of the triangle feature plane;Finally,the mathematical simulation model is established and the measurement error factors are *** results show that the proposed method is effective and feasible.

关键词： Non-Cooperative measurement Unknown Space Size Line Structured Light Triangular Feature

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Plug-and-Play Approach to Nonadiabatic Geometric Quantum Gates

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Physical Review Letters 2019年第10期123卷 100501-100501页

作者： Bao-Jie Liu Xue-Ke Song Zheng-Yuan Xue Xin Wang Man-Hong Yung Institute for Quantum Science and Engineering and Department of Physics Southern University of Science and Technology Shenzhen 518055 China Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials GPETR Center for Quantum Precision Measurement and SPTE South China Normal University Guangzhou 510006 China Department of Physics City University of Hong Kong Tat Chee Avenue Kowloon Hong Kong SAR China and City University of Hong Kong Shenzhen Research Institute Shenzhen Guangdong 518057 China Shenzhen Key Laboratory of Quantum Science and Engineering Shenzhen 518055 China Central Research Institute Huawei Technologies Shenzhen 518129 China

Nonadiabatic holonomic quantum computation (NHQC) has been developed to shorten the construction times of geometric quantum gates. However, previous NHQC gates require the driving Hamiltonian to satisfy a set of rather restrictive conditions, reducing the robustness of the resulting geometric gates against control errors. Here we show that nonadiabatic geometric gates can be constructed in an extensible way, called NHQC+, for maintaining both flexibility and robustness against certain types of noises. Consequently, this approach makes it possible to incorporate most of the existing optimal control methods, such as dynamical decoupling, composite pulses, and a shortcut to adiabaticity, into the construction of single-looped geometric gates. Furthermore, this extensible approach of geometric quantum computation can be applied to various physical platforms such as superconducting qubits and nitrogen-vacancy centers. Specifically, we performed numerical simulation to show how the noise robustness in recent experimental implementations [Phys. Rev. Lett. 119, 140503 (2017); Nat. Photonics 11, 309 (2017)] can be significantly improved by our NHQC+.approach. These results cover a large class of new techniques combing the noise robustness of both geometric phase and optimal control theory.

关键词： Geometric & topological phases Quantum control Quantum gates Quantum information with solid state qubits Topological quantum computing

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Piezoelectric thermoelastic dissipation research of piezoelectric harvester under different vibration 2

Piezoelectric thermoelastic dissipation research of piezoele...

引用

2nd International Conference on Electronic Information technology and Computer engineering, EITCE 2018

作者： Liu, Yuting Deng, Jiahao Ye, Yong Hou, Zhuo Duan, Zuodong Xu, Sha School of Mechatronical Engineering Beijing Institute of Technology Beijing100081 China Science and Technology on Electromechanical Dynamic Control Laboratory Beijing Institute of Technology Beijing100081 China College of Information Engineering Shenzhen University Shenzhen518060 China National Key Laboratory of Electronic Measurement Technology North University of China Taiyuan030051 China

Piezoelectric materials are widely used to form piezoelectric energy harvesters. Also, the thermoelastic dissipation always influences the energy harvesting efficiency, during the energy harvest process. Therefore, in this paper, we discuss the effect of thermoelastic dissipation on the piezoelectric harvester through numerical calculation, simulation and experiment. The piezoelectric thermoelastic coupling governing equations under different vibration are derived, which are based on the Euler-Bernoulli beam theory, thermal conduction model and piezoelectric field model. Then, the structure frequency shift and thermoelastic damping are studied via numerical calculation and simulation. Meanwhile, we show the influence of the temperature field on the piezoelectric structure under different vibration modes. Furth more, we research the variations of piezoelectric structure thermoelastic dissipation characteristics under different structure geometry sizes. Based on these analyses, the effect of piezoelectric thermoelastic dissipation on the piezoelectric harvester is researched © The Authors, published by EDP Sciences, 2018.

关键词： Energy harvesting

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