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10th International Forum on Electrical Engineering and Automation, IFEEA 2023

作者： Xing, Zhaoliang Zhang, Jianjun Zeng, Fanqiu Wang, Jian Guo, Shaowei Zhang, Xinghui Zhang, Chong Yu, Yong Qi, Bo Gao, Chunjia State Grid Smart Grid Research Institute Co. Ltd. State Key Laboratory of Advanced Power Transmission Technology Beijing China State Grid Tangshan Power Supply Company Tangshan China North China Electric Power University State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources Beijing China State Grid Corporation of China Beijing China

ISBN: (纸本)9798350309379

Biaxially oriented polypropylene (BOPP) film are generally impregnated in benzyltoluene, which constitute insulating medium of high-voltage capacitors. In order to investigate the electrical properties of impregnated film, this paper builds a test platform for the electrical properties of polypropylene film, and selects key electrical properties such as relative dielectric constant, dielectric loss and breakdown field strength. Testing five thicknesses of film to obtain the laws of the influence of impregnation state on electrical parameters at different temperatures and field strengths. The test result shows that: 1) Dielectric constant of the impregnated film increases from 2.25 to 2.27 at room temperature, the dielectric loss increases from 1.39×10-4 to 2.7×10-4, the average value of DC breakdown field strength of the 13 μm film increases from 619 MV/m to 683 MV/m, the average value of AC breakdown field strength increases from 420 to 460 MV/m. 2) Impregnated film is more affected by the temperature and field strength. The temperature changes from 293K to 353K, the growth rate of dielectric constant increases from 0.5% to 2% after impregnation, and the dielectric loss increases from 1 to 1.5 times. 3) Breakdown field strength increases and then decreases with the thickness, and 13μm film has the highest breakdown field strength. © 2023 IEEE.

关键词： biaxially oriented polypropylene film electrical characteristics impregnation

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Research on the Process-based Generation Method of Scenarios Database for Maritime Autonomous Surface Ship Test 7

Research on the Process-based Generation Method of Scenarios...

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2022 7th International Conference on Electronic Technology and Information Science, ICETIS 2022

作者： Wang, Xinyu Wang, Yihang Ma, Jilin Bian, Hui Zhao, Xuan Lan, Yaoyao Qinhuangdao Branch China Classification Society Hebei Qinhuangdao China School of Mechanical Engineering Yanshan University Hebei Qinhuangdao China Science and Technology Innovation and Test Center China Classification Society Beijing China Parallel Robot and Mechatronic System Laboratory of Hebei Province Key Laboratory of Advanced Forging and Stamping Technology and Science Yanshan University Hebei Qinhuangdao China Parallel Robot and Mechatronic System Laboratory of Hebei Province Key Laboratory of Advanced Forging and Stamping Technology and Science Yanshan University Hebei Qinhuangdao China

ISBN: (纸本)9783800757794

In recent years, Maritime Autonomous Surface Ship (MASS) has been developed rapidly and has demonstrated many new capabilities, which poses a challenge to the testing methods of autonomous ships. Currently, traditional test methods is no longer sufficient to support comprehensive testing and verification. For virtual testing, there is still a lack of a reliable virtual test scenario generation process. Therefore, this paper proposes a method for generating virtual test scenarios for autonomous ships. It is based on the scenario generation frame of the intelligent car and comprehensively considers the feature of the operating environment of the MASS. This process develops an element database by deconstructing the real scenes. For generating, it reconstructs and assigns the elements according to the test task (functional scenario) and the logical relationship between the elements (logical scenario) to reconstruct the new scenario. The new scenarios obtained in this way are optimized and supplemented to be the test scenarios database. In addition, a prototype following this frame was designed and loaded with the "automatic pathfinding task of the Wuhan section of the Yangtze River under good navigation conditions" for testing. The experiment generated 48 different scenarios, proving that this generator can output a comprehensive test scenario database to meet test requirements. © VDE VERLAG GMBH ∙ Berlin ∙ Offenbach.

关键词： Database systems

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Microstructure and Mechanical Properties of Graphene Reinforced K418 Superalloy by Selective Laser Melting

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Acta Metallurgica Sinica(English Letters) 2022年第9期35卷 1477-1493页

作者： Yongxin Lu Fan Luo Zhen Chen Jian Cao Kai Song Lei Zhao Xueli Xu Hongduo Wang Wenya Li School of Material Science and Engineering Xi’an Shiyou UniversityXi’an710065China State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin150001China School of Materials Science and Engineering Northwestern Polytechnical UniversityXi’an710072China State Key Laboratory of Manufacturing System Engineering Xi’an Jiaotong UniversityXi’an710049China School of Materials Science and Engineering Tianjin UniversityTianjin300350China Xi’an Key Laboratory of High Performance Oil and Gas Field Materials Xi’an Shiyou UniversityXi’an710065China

In order to obtain the superalloy with excellent properties, graphene reinforced K418 nickel base superalloy(GNPs/K418 composite) was prepared by selective laser melting technique in this study. Through systematically comparing and analyzing the microstructure and mechanical property of K418 superalloy and GNPs/K418 composite, it is found that the percentage of small-diameter grain(≤ 15 μm) increased from 84% to 90%, and the max strength of grain orientation(<001>) reduce from 5.76 to 4.17 due to the addition of GNPs. And GNPs can also improve the height and the full width at the half peak of the strong diffraction peak of GNPs/K418 composite. Besides, GNPs/K418 composite is a kind of sandwiched structure, which is consist of GNPs, carbides, and K418 matrix. Therefore, the hardness of the GNPs/K418 composite is 4.1% and 6.9% higher than that of the K418 matrix in the transverse and vertical direction, respectively. The room temperature tensile strength of the GNPs/K418 composite is 9% higher than that of the K418 matrix. And the 600℃ and 900℃ tensile strengths of the GNPs/K418 composite are 7.6% and 10.4% higher than that of the K418 matrix, respectively. It is inferred that the effect of graphene on K418 matrix strengthening is mainly fine grain strengthening and Orowan strengthening. However, the elongation rate of the composite material is reduced, which is attributed to crack sprouting at the interface between the matrix and GNPs under high stress.

关键词： Graphene K418 nickel base superalloy Selective laser melting Tensile properties

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Generation of polarization-multiplexed terahertz orbital angular momentum combs via all-silicon metasurfaces

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Light(advanced Manufacturing) 2024年第3期5卷 120-129页

作者： Ming-Zhe Chong Yiwen Zhou Zong-Kun Zhang Jin Zhao Yue-Yi Zhang Chong-Qi Zhang Xiaofei Zang Chao-Hai Du Pu-Kun Liu Ming-Yao Xia School of Electronics Peking UniversityBeijing 100871China Terahertz Technology Innovation Research Institute and Shanghai Key Lab of Modern Optical SystemUniversity of Shanghai for Science and TechnologyNo.516 Jun Gong RoadShanghai 200093China State Key Laboratory of Advanced Optical Communication Systems and Networks School of ElectronicsPeking UniversityBeijing 100871China

Electromagnetic waves carrying orbital angular momentum(OAM),namely OAM beams,are important in various fields including optics,communications,and quantum ***,most current schemes can only generate single or several simple OAM ***-mode OAM beams are rarely *** paper proposes a scheme to design metasurfaces that can generate multiple polarization-multiplexed OAM modes with equal intervals and intensities(i.e.,OAM combs)working in the terahertz(THz)*** a proof of concept,we first design a metasurface to generate a pair of polarization-multiplexed OAM combs with arbitrary mode ***,another metasurface is proposed to realize a pair of polarization-multiplexed OAM combs with arbitrary locations and intervals in the OAM *** results agree well with full-wave simulations,verifying a great performance of OAM combs *** method may provide a new solution to designing high-capacity THz devices used in multi-mode communication systems.

关键词： Metasurfaces Terahertz Orbital angular momentum comb Polarization multiplexing

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Emerging material platforms for integrated microcavity photonics

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Science China(Physics,Mechanics & Astronomy) 2022年第10期65卷 10-28页

作者： Jin Liu Fang Bo Lin Chang Chun-Hua Dong Xin Ou Blake Regan Xiaoqin Shen Qinghai Song Baicheng Yao Wenfu Zhang Chang-Ling Zou Yun-Feng Xiao State Key Laboratory of Optoelectronic Materials and Technologies School of PhysicsSun Yat-sen UniversityGuangzhou 510000China MOE Key Laboratory of Weak-Light Nonlinear Photonics TEDA Institute of Applied Physics and School of PhysicsNankai UniversityTianjin 300071China State Key Laboratory of Advanced Optical Communications System and Networks School of ElectronicsPeking UniversityBeijing 100871China CAS Key Lab of Quantum Information University of Science and Technology of ChinaHefei 230026China State Key Laboratory of Functional Material for Informatics Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050China School of Mathematical and Physical Sciences University of Technology SydneyUltimo 2007Australia School of Physical Science and Technology ShanghaiTech UniversityShanghai 201210China Ministry of Industry and Information Technology Key Lab of Micro-Nano Optoelectronic Information System Harbin Institute of TechnologyShenzhen 518055China Key Laboratory of Optical Fiber Sensing and Communications(Ministry of Education) University of Electronic Science and Technology of ChinaChengdu 611731China State Key Laboratory of Transient Optics and Photonics Xi’an Institute of Optics and Precision MechanicsChinese Academy of SciencesXi’an 710119China State Key Laboratory for Mesoscopic Physics and Frontiers Science Center for Nano-optoelectronics School of PhysicsPeking UniversityBeijing 100871China

Many breakthroughs in technologies are closely associated with the deep understanding and development of new material *** the main material used in microelectronics,Si also plays a leading role in the development of integrated *** indirect bandgap,absence ofχ(2)nonlinearity and the parasitic nonlinear absorptions at the telecom band of Si imposed technological bottlenecks for further improving the performances and expanding the functionalities of Si microcavities in which the circulating light intensity is dramatically *** past two decades have witnessed the burgeoning of the novel material platforms that are compatible with the complementary metal-oxide-semiconductor(COMS)*** particular,the unprecedented optical properties of the emerging materials in the thin film form have resulted in revolutionary progress in microcavity *** this review article,we summarize the recently developed material platforms for integrated photonics with the focus on chip-scale microcavity *** material characteristics,fabrication processes and device applications have been thoroughly discussed for the most widely used new material *** also discuss open challenges and opportunities in microcavity photonics,such as heterogeneous integrated devices,and provide an outlook for the future development of integrated microcavities.

关键词： microcavity integrated optics nonlinear optics

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基于最先进的光钟直接演示自旋压缩引起的计量增强

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Science Bulletin 2024年第10期69卷 1359-1361页

作者：陈景标于得水 State Key Laboratory of Advanced Optical Communication System and NetworkSchool of ElectronicsPeking UniversityBeijing 100871China National Time Service Center Chinese Academy of SciencesXi’an 710600China Key Laboratory of Time Reference and Applications Chinese Academy of SciencesXi’an 710600China

Benefiting from the recent progress in precise engineering of quantum states and sub-10 mHz linewidth lasers,the stability and accuracy of optical atomic clocks have reached and even exceeded the 1018 level,surpassing their microwave counterparts by over two orders of magnitude[1,2].These advances lead to an anticipated redefinition of the international system of units(SI)second in terms of an optical reference transition as early as 2026.

关键词： optical 光钟自旋压缩

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Applied to calibrate the new intelligent bearing of NiCr/NiSi film thermocouple 7

Applied to calibrate the new intelligent bearing of NiCr/NiS...

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7th International Conference on Aeronautical, Aerospace and Mechanical Engineering, AAME 2024

作者： Liu, Zhihui Guo, Tengda Cheng, Yongjun Wang, Bi Li, Yangsen Chen, Weiyu Wang, Zixi Ding, Wanyu State Key Laboratory of Tribology in Advanced Equipment Tsinghua University Beijing100084 China College of Materials Science and Engineering Dalian Jiaotong University Dalian116028 China Laboratory of Low Frequency Electromagnetic Communication Technology with the WMCRT CSSC China State Key Laboratory of High-end Compressor and System Technology Anhui Hefei230031 China State Grid Fuiian Electric Power Co. Ltd China Fujian Power Transmission and Transformation Engineering Co. Ltd China

The purpose of this paper is to study the calibration method of new intelligent bearing applied to NiCr/NiSi film thermocouple. Firstly, the basic principle and characteristics of NiCr/NiSi film thermocouple and intelligent bearing are introduced, and then the design and realization process of intelligent bearing are elaborated, including material selection, structural design, manufacturing process and so on. Then, this paper puts forward the calibration method of intelligent bearing, and verifies its effectiveness through experiments. The experimental results show that the Seebeck coefficient of NiCr/NiSi thin film thermocouple new intelligent bearing is 41.00 μV/°C, and the Seebeck coefficient of standard K thermocouple is 41.20 μV/°C. The new intelligent bearing has high sensitivity and stability, and can achieve fast response and accurate measurement. Finally, this paper summarizes the research results, and looks forward to the future research direction. © Published under licence by IOP Publishing Ltd.

关键词： Thermocouples

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Fast and Accurate Estimation of MDL - Induced SNR Penalty in SDM Link with Non-Uniform Noise Loading

Fast and Accurate Estimation of MDL - Induced SNR Penalty in...

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Asia Communications and Photonics Conference and Exhibition (ACP)

作者： Tonghui Ji Qi Wu Zhaopeng Xu Honglin Ji Yu Yang Lulu Liu Shangcheng Wang Zhongliang Sun Junpeng Liang Linsheng Fan Jianwei Tang Jinlong Wei Juhao Li Weisheng Hu Pengcheng Laboratory Shenzhen China State Key Lab of Advanced Optical Communication System and Networks Shanghai Jiao Tong University Shanghai China State Key Laboratory of Advanced Optical Communication Systems & Networks Peking University Beijing China

We propose a fast and accurate estimation method of MDL-induced SNR penalty with non-uniform noise loading in SDM link. The proposed approach substantially saves the time cost while maintaining an estimation error wit... 详细信息

ISBN: (数字)9798350379266

ISBN: (纸本)9798350379273

关键词： Optical losses Costs Accuracy Simulation Loading Propagation losses Optical fiber communication Numerical models Signal to noise ratio Photonics

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Surface Charge Accumulation Characteristics on DC GIL Three-post Insulators Considering the Influence of Temperature Gradient

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CSEE Journal of Power and Energy systems 2023年第5期9卷 1926-1934页

作者： Qi Hu Qingmin Li Zhipeng Liu Naifan Xue Jian Wang Manu Haddad North China Electric Power University Beijing 102206China.He is now with State Grid Jiangxi Electric Power Co.Ltd.Nanchang 330077China the State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power UniversityBeijing 102206China the Advanced HV Engineering Research Centre Cardiff UniversityThe ParadeCardiff CF243AAU.K.

Surface charge accumulation is considered to be a critical factor in flashover failure of three-post ***,surface charge accumulation characteristics on threepost insulators with complex structures and uneven electric fields are still ***,the temperature gradient field makes charge accumulation more *** this presentation,surface charge profiles of DC three-post insulators under electro-thermal coupling stress are studied by establishing a multi-degree-of-freedom movement measurement *** abdominal area of the three-post insulator accumulaftes charges of identical polarity as the DC voltage,while the leg area accumulates heteropolar *** density from the bottom of the leg to the center of the abdomen presents a trimodal distribution pattern,including two homopolar charge peaks and one heteropolar charge *** surface conductance distribution arising from the temperature gradient leads to a significant increase in amplitude and distribution range of the homopolar charge peak at the legs of *** of the temperature gradient will further magnify the homopolar charge peak at the *** DC voltage is 100 kV and conductive pole temperature is 70℃,surface charge density of the three-post insulator can reach 100μC/m^(2).Therefore,surface conductance regulation of the leg region is the key to charge regulation and insulation optimization design of DC three-post insulators.

关键词： Charge accumulation charge measurement surface charge temperature gradient three-post insulator

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1-Pb/s CPRI-Equivalent Rate Coherent DA-RoF Fronthaul with 1024-QAM Scalable in Capacity, Reach, and Linewidth Using Residual Carrier-Based Phase Tracking

1-Pb/s CPRI-Equivalent Rate Coherent DA-RoF Fronthaul with 1...

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Asia Communications and Photonics Conference and Exhibition (ACP)

作者： Yixiao Zhu Xiansong Fang Chenbo Zhang Jingjing Lin Yicheng Xu Weiwei Hu Zhangyuan Chen Qunbi Zhuge Fan Zhang Xiaopeng Xie Weisheng Hu State Key Laboratory of Advanced Optical Communication System and Networks Shanghai Jiao Tong University Shanghai China State Key Laboratory o_f Advanced Optical Communication System and Networks Peking University Beijing China

We demonstrate 1.0-Pb/s CPRI-equivalent rate fronthaul with 1024-QAM by using digital-analog radio-over-fiber and coherent detection based on modulator bias-induced residual carrier for phase tracking. The reach is extended to 20-km SSMF with 4096-QAM and 80-km with 256-QAM, and laser linewidth can be relaxed to 3MHz.

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