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A study of pulsed high voltage driven hollow-cathode electron beam sources through synchronous optical trigger

Plasma Science and technology 2024年第5期26卷 82-90页

作者：霍卫杰贺伟国韩罗峰朱康武王锋 Shanghai Aerospace Electronic Technology Institute Shanghai 201109People’s Republic of China School of Mechatronic Engineering and Automation Shanghai UniversityShanghai 200444People’s Republic of China School of Fundamental Physics and Mathematical Sciences Hangzhou Institute for Advanced StudyUniversity of Chinese Academy of SciencesHangzhou 310024People’s Republic of China Key Laboratory of Gravitational Wave Precision Measurement of Zhejiang Province Taiji Laboratory for Gravitational Wave UniverseHangzhou 310024People’s Republic of China Shanghai Aerospace Control Technology Institute Shanghai 201109People’s Republic of China

In this study,a pulsed,high voltage driven hollow-cathode electron beam sources through an optical trigger is designed with characteristics of simple structure,low cost,and easy *** validate the new design,the characteristics of hollow-cathode discharge and electron beam characterization under pulsed high voltage drive are studied experimentally and discussed by discharge characteristics and analyses of waveform details,*** validation experiments indicate that the pulsed high voltage supply significantly improves the frequency and stability of the discharge,which provides a new solution for the realization of a high-frequency,high-energy electron beam *** peak current amplitude in the high-energy electron beam increases from 6.2 A to 79.6 A,which indicates the pulsed power mode significantly improves the electron beam ***,increasing the capacitance significantly affects the highcurrent,lower-energy electron beam more than the high-energy electron beam.

关键词： hollow-cathode nanosecond pulsed electron beam sources optical trigger pulsed high voltage supply beam current distribution

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Magnetic Microrobots Fabricated by Photopolymerization and Assembly

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Cyborg and Bionic Systems 2023年第1期4卷 41-46页

作者： Xiyue Liang Yue Zhao Dan Liu Yan Deng Tatsuo Arai Masaru Kojima Xiaoming Liu Key Laboratory of Biomimetic Robots and Systems Ministry of EducationState Key Laboratory of Intelligent Control and Decision of Complex SystemBeijing Advanced Innovation Center for Intelligent Robots and Systemsand School of Mechatronical EngineeringBeijing Institute of TechnologyBeijing 100081China Center for Neuroscience and Biomedical Engineering The University of Electro-CommunicationsTokyo 182-8585Japan Department of Materials Engineering Science Osaka UniversityOsaka 560-8531Japan

Magnetic soft microrobots have great potential to access narrow spaces and conduct multiple tasks in the biomedical *** now,drug delivery,microsurgery,disease diagnosis,and dredging the blocked blood vessel have been realized by magnetic soft microrobots in vivo or in ***,as the tasks become more and more complex,more functional units have been embedded in the body of the developed magnetic *** magnetic soft microrobots with complex designed geometries,mechanisms,and magnetic orientation are now greatly challenging the fabrication of the magnetic *** this paper,we propose a new method combining photopolymerization and assembly for the fabrication of magnetic soft *** the micro-hand assembly system,magnetic modules with different shapes and materials are firstly arrayed with precise position and orientation ***,the developed photopolymerization system is employed to fix and link these modules with soft *** on the proposed fabrication method,3 kinds of soft magnetic microrobots were fabricated,and the fundamental locomotion was *** believe that the presented fabrication strategy could help accelerate the clinical application of magnetic microrobots.

关键词： Magnetic system precise

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High-fidelity parametric amplification of Ince–Gaussian beams

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Chinese Optics Letters 2022年第11期20卷 105-109页

作者： Ding Yan Zhiyuan Zhong Tong Qi Hongying Chen Wei Gao Heilongjiang Provincial Key Laboratory of Quantum Control School of Measurement and Communication EngineeringHarbin University of Science and TechnologyHarbin 150080China

Ince–Gaussian (IG) beams, as eigenfunctions of the paraxial wave equation in elliptical coordinates, are attracting increasing interest owing to their propagation-invariant and full-field properties. Optical amplification via parametric interactions can further expand their application areas, yet it is rarely studied. In this work, we report on a high-fidelity parametric amplifier for IG beams. The nonlinear transformation of the spatial spectra of the signal and associated influences on the beam profiles of the amplified signal, under different pump structures, were theoretically and experimentally investigated. By using a perfect flattop beam as the pump, we show that the transverse structure of IG signals is well maintained,and the distortion induced by radial-mode degeneration is overcome during amplification. This proof-of-principle demonstration paves the way for a mode-independent and distortion-free amplifier of arbitrary structured light and has great significance in relevant areas, such as quantum optics, tunable infrared-laser generation, and image amplification.

关键词： optical parametric amplification Ince–Gaussian beam high fidelity perfect flattop beam

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Design and technology review of the solar X-ray detector onboard the Macao Science Satellite-1B

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Science China(Technological Sciences) 2024年第11期67卷 3365-3380页

作者： ZUO FuChang SHI YongQiang CHEN JianWu ZHANG XiaoPing FU WeiChun CHANG Ye GAI FangQin LIU SiYuan XIONG Yan ZHANG HaiLi SUN Yan WANG Li ZHENG Ran LI LianSheng MEI ZhiWu HUANG He ZHA GangQiang ZHANG KeKe Space Optoelectronic Measurement and Perception Lab. Beijing Institute of Control EngineeringBeijing 100190China State Key Laboratory of Lunar and Planetary Sciences Macao University of Science and TechnologyMacao 999078China School of Astronautics Northwestern Polytechnical UniversityXi’an 710072China Key Laboratory of Radiation Detection Materials and Devices Northwestern Polytechnical UniversityXi’an 710072China Research and Development Institute of Northwestern Polytechnical University in Shenzhen Shenzhen 518063China

On May 21,2023,the Macao Science Satellite-1B(MSS-1B),a low-inclination,low-latitude,and high-precision scientific exploration satellite for geomagnetic fields and space environments,was successfully *** solar X-ray detector(SXD),one of the two major scientific payloads onboard the MSS-1B,has obtained a large amount of solar X-ray radiation data,which reveals the distribution law of the magnetic field in the low Earth orbit,as well as the coupling law of the Earth's magnetic field and the solar radiation and energy particle ***,the overall design of the multi-detection-unit,broad-energy-range,small-volume,and low-power SXD was implemented to achieve the scientific objectives of the ***,the technical indicators of the instrument were decomposed into various components,and the key technologies,such as collimator,processing circuit,thermal,and payload dataset designs,were ***,the backgrounds,including electronic noise,cosmic diffuse X-ray background,and high-energy background in the Earth's radiation belts in and out of the field of view,were analyzed for the ***,the ground calibrations of the energy response,detection efficiency,and temperature-dependent peak drift of the SXD flight model were ***,the in-orbit temperature,energy spectrum data,background,and solar flare process observation of the instrument in the in-orbit test stage are presented,verifying the instrument design,analysis,and ground calibration,providing a foundation for obtaining accurate solar X-ray radiation data,and achieving the scientific objectives of the satellite.

关键词： Macao Science Satellite-1B solar X-ray detector design and development solar flare technology review

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Hopping robot: Current status and future perspectives

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Recent Patents on Mechanical engineering 2021年第4期14卷 440-455页

作者： Jiang, Jingang Zeng, Yang Yu, Xiaoyang Wu, Dianhao Guo, Yafeng Key Laboratory of Advanced Manufacturing and Intelligent Technology Ministry of Education Harbin University of Science and Technology Harbin150080 China Intelligent Machine Institute Harbin University of Science and Technology Harbin150080 China School of Measurement-Control Technology and Communications Engineering Harbin University of Science and Technology Harbin150080 China

Background: Search and rescue in high-risk situations and searches in unknown environments pose certain threats to human life. The development of mobile robots with exploratory capabilities that can be adapted to complex sites with high mobility and high obstacle-crossing capabilities is, therefore, a research trend. Existing wheeled and tracked mobile robots have excellent locomotion, but they are less adaptable and less efficient when faced with complex terrain or outer space environments. Therefore, how to increase the obstacle-crossing ability and improve the movement efficiency of mobile robots have become a research hotspot in the field of mobile robotics. Objective: To introduce the classification, characteristics, and the development of the existing hopping robots. Methods: The various products and patents of hopping robots are summarized, and the structural features, differences, and applications of typical hopping robots are introduced. Results: By analyzing a variety of hopping robots, the typical characteristics and the current problems of hopping robots are analyzed, the development trend of hopping robots is prospected, the current research status of hopping robots is discussed, and the future prospects are carried out Conclusion: Hopping robots can be divided into mechanical energy driven, combustion energy driven and new energy-driven according to the drive energy sources. Depending on the drive energy used, jumping robots can achieve a jump height 0.5-30 times higher than their own size, and when combined with a specific mechanical structure design, they are highly explosive, have high mobility and can solve interstellar exploration, terrain exploration and rescue problems. Compared to mechanical energy driven technique, combustion energy-driven technique is two orders of magnitude more energy-intensive than even the highest performing batteries. The use of recycled, renewable energy solves the energy self-loading problem of combustion energy driven

关键词： Machine design

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Design and Implementation of a Frequency Converter Power Supply 4

Design and Implementation of a Frequency Converter Power Sup...

引用

4th International Conference on Intelligent control, measurement and Signal Processing, ICMSP 2022

作者： Liu, Hao Zhang, Qizhi School of Electronic Engineering Xi'an Shiyou University Xi'an China Shaanxi Provincial Key Lab of Oil and Gas Well Measurement and Control Technology Xi'an China

ISBN: (数字)9781665486583

ISBN: (纸本)9781665486583

In order to realize the miniaturization, high efficiency and low cost of inverter power supply, this paper introduces the demand characteristics and working principle of inverter power supply, deduces its small signal model in detail, and analyzes the key parameters and design process of power conversion circuit, PWM control circuit and feedback detection circuit. PSIM software was used to build a circuit simulation model, and the hardware closed-loop automatic control of inverter power supply was studied. The high-precision and stable output of DC 24V/1A, 12V/1A and 5V/3A was realized. The simulation results prove the feasibility and correctness of the design. © 2022 IEEE.

关键词： Electric inverters

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Task Offloading and Resource Allocation Scheme based on Cooperative Game

Task Offloading and Resource Allocation Scheme based on Coop...

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2022 IEEE International Conference on Artificial Intelligence and Computer Applications, ICAICA 2022

作者： Benhong, Zhang Liang, Han Xiang, Bi Hefei University of Technology School of Computer Science and Information Engineering Hefei China Hefei University of Technology Engineering Research Center of Safety Critical Industrial Measurement and Control Technology Ministry of Education Anhui Hefei230009 China

ISBN: (数字)9781665499910

ISBN: (纸本)9781665499910

Mobile edge computing plays an irreplaceable role in 5G network and IoT technology. In addition, it is very urgent for MEC to find an effective task offloading decision and resource allocation method. Although there are many methods, they rarely consider the situation that the uneven processing capacity of MEC server leads to excessive task concentration during the process of offloading. In this article, a cooperative game is proposed to optimize the offloading and resource allocation schemes. The cost function is calculated by calculating the time and power consumption of tasks on different devices, and the task priority is determined by the difference between local calculation and MEC server calculation. In addition, the Lagrange multiplier method is used to allocate various resources required by the task. At the same time, the high-priority task is offloaded. On this basis, the task offloading scheme required by each server is obtained through multi-server cooperative game. The simulation results show that compared with the traditional algorithm, this scheme can not only reduce the total system overhead by about 31 % while meeting the task requirements, but also increase the system load rate by about 20 %. It maximizes the use of MEC server resources and balances the load between MEC servers with different computing capabilities. © 2022 IEEE.

关键词： Mobile edge computing

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Bit-Level Composite Signal Design for Simultaneous Ranging and Communication

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China communications 2021年第6期18卷 214-227页

作者： Weigang Chen Yalong He Changcai Han Jinsheng Yang Zhan Xu School of Microelectronics Tianjin UniversityTianjin 300072China Key Laboratory of Modern Measurement and Control Technology Beijing 100192China School of Information and Communication Engineering Beijing Information Science and Technology UniversityBeijing 100192China

As the complexity of space exploration missions augments,how to enhance the overall performance of communication,ranging or other functions has become a challengeable *** the integration of communication and ranging,we present a bit-level composite signal for simultaneous ranging and *** this composite method,through a specially designed mapping scheme using low-weight codewords,the information sequence is converted to a sparse sequence which is then superimposed on the ranging *** ranging,the correlation characteristics of the ranging code component can be maintained to calculate the transmitter-receiver *** communications,the sparse sequence can be extracted without interference by eliminating the ranging code *** results show that the proposed composite signal can support communication and ranging simultaneously with limited sacrifice of ranging performance,and the performance loss of ranging can be controlled and minimized by lowering the density of information sequences using different sparsification encoding methods.

关键词： composite signal spectrum sharing lowweight codeword regenerative PN ranging code

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An Improved Slap Swarm Algorithm Incorporating Tent Chaotic Mapping and Decay Factor 4

An Improved Slap Swarm Algorithm Incorporating Tent Chaotic ...

引用

4th International Conference on Intelligent control, measurement and Signal Processing, ICMSP 2022

作者： Zhang, Jiawei Zhang, Qizhi Li, Lin School of Electronic Engineering Xi'an Shiyou University Xi'an China Shaanxi Provincial Key Lab of Oil and Gas Well Measurement and Control Technology Xi'an China

ISBN: (数字)9781665486583

ISBN: (纸本)9781665486583

Aiming at the defects of local stagnation and slow convergence speed of Salp Swarm Algorithm in the optimization process, an improved Salp Swarm Algorithm (ISSA) incorporating Tent chaotic mapping and decay factor is proposed. To begin, the Tent chaotic mapping strategy is used to initialize the population, which allows the population to traverse the search space and improve the first stage of the algorithm's iteration speed;second, the decay factor is added to the leader position update, which expands the search range and improves the algorithm's search accuracy. The experimental results reveal that the improved algorithm's exploration ability and optimization accuracy have been greatly enhanced by a series of benchmark function simulations. © 2022 IEEE.

关键词： Iterative methods

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Stator Flux Sliding Mode Observer of Permanent Magnet Synchronous Motor Based on Effective Flux 4

Stator Flux Sliding Mode Observer of Permanent Magnet Synchr...

引用

4th International Conference on Intelligent control, measurement and Signal Processing, ICMSP 2022

作者： Huang, Shengjie Zhang, Qizhi School of Electronic Engineering Xi'an Shiyou University Xi'an China Shaanxi Provincial Key Lab of Oil and Gas Well Measurement and Control Technology Xi'an China

ISBN: (数字)9781665486583

ISBN: (纸本)9781665486583

In order to improve the stator flux observation performance of permanent magnet synchronous motor (PMSM) with DIRECT Torque control (DTC), a stator flux sliding mode observer is proposed based on the concept of effective flux. The stator current and effective flux in the stator stationary coordinate system are taken as state variables to construct the corresponding sliding mode observer. The stator flux is calculated according to the observed effective flux. Experimental results show that the proposed observer can obtain more accurate stator flux observations than the open-loop observer. The proposed observer has strong robust suppression ability to the variation of motor inductance. © 2022 IEEE.

关键词： Torque control

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