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Sinusoidal and nonsinusoidal patterns in amplitude envelope synchronization

Physical Review E 2022年第4期105卷 044209-044209页

作者： Hanchang Liu Weiqing Liu Chaoxin Fu Meng Zhan School of Science Jiangxi University of Science and Technology Ganzhou 341000 China School of Electronic Information and Communications Huazhong University of Science and Technology Wuhan 430074 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology and School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan 430074 China

In this work, amplitude envelope synchronization (AES), as a general phenomenon characterized with highly correlated amplitude envelope but uncorrelated phases and frequencies in coupled nonidentical nonlinear systems, is investigated theoretically and numerically. Two different types of AES patterns, including sinusoidal and nonsinusoidal, are widely observable in coupled periodic and/or chaotic oscillators. They both come from modulation of phase mismatch on amplitude but show different patterns due to different behaviors of phase mismatch. With increase of frequency mismatch, the system tends to crossover from nonsinusoidal to sinusoidal AES. With the aid of synchronization manifold and transverse stability analyses of the AES state, the physical mechanism and scale relations for the AES are well revealed. We expect that all these results could uncover the generality of AES in coupled nonlinear oscillators and help to understand the rich dynamics of phase and amplitude coupling in multidisciplinary fields.

关键词： Coupled oscillators Synchronization

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Medium and Long-Term Electricity Forecasting Method Based on Solow Model: A Case of Hubei Province 4

Medium and Long-Term Electricity Forecasting Method Based on...

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4th IEEE China International Electrical and Energy Conference, CIEEC 2021

作者： Ling, Xu Yu, Haiyang Lou, Suhua Wang, Yuan Xi, Jianghui Ouyang, Litao Central China Branch of State Grid Corporation of China Wuhan China Huazhong University of Science and Technology China-EU Institute for Clean and Renewable Energy Wuhan China Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9781728171494

Accurate electricity forecasting is very significant to power system. Modern smart grid has huge data and complex structure, and the nonlinear relationship between influencing factors and electricity demand is complex, random and changeable. Only by making full use of large amounts of data, accurate, stable and reliable medium and long-term electricity prediction can be made. Based on the traditional Solow Model, this paper proposes an Extended Solow Model by analyzing a lot of economic data and extracting key influencing factors. With the real load data of Hubei power grid, the experimental results show that the Extended Solow Model proposed by this paper can effectively improve the forecasting accuracy of 1.40% compared with the traditional Solow Model. © 2021 IEEE.

关键词： Forecasting

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Sc-Doping in Na3zr2si2po12 Electrolytes Enable Preeminent Performance of Solid-state Sodium Batteries in a Wide Temperature Range

SSRN

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SSRN 2022年

作者： Wang, Qiao Yu, Chuang Li, Liping Liu, Xiaoqing Zhang, Xin Gao, Guichen Wang, Yaowen Li, Guangshe State Key Laboratory of Inorganic Synthesis and Preparative Chemistry College of Chemistry Jilin University Changchun130012 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Hubei Wuhan430000 China

Solid-state sodium batteries (SSSBs) display great potential in scale energy storage for their safety, cost and sustainability. However, it is a great challenge to achieve high ionic conductivity and temperature adaptability for most sodium-ion solid electrolytes. Here, we demonstrate that Sc 3+ -doped Na 3 Zr 2 Si 2 PO 12 (NASICON) is a promising electrolyte for a wide temperature range utilizing in SSSBs from 0 to 50 °C. Optimal Na 3.4 Zr 1.6 Sc 0.4 Si 2 PO 12 shows a superior Na-ion conductivity, up to 1.77×10 -3 S cm -1 at room temperature, and excellent Na metal compatibility, as confirmed by symmetrical cell test. Furthermore, the solid-state sodium battery with the configuration of Na 3 V 2 (PO 4 ) 3 /Na 3.4 Zr 1.6 Sc 0.4 Si 2 PO 12 /Na maintains a discharge capacity of 98.7 mAh g -1 at 1C after 300 cycles at room temperature. Even at 0 °C, the battery still displays a reversible capacity of 99.2 mAh g -1 at 0.1C after 100 cycles. Through the structure analysis and ex-situ and in-situ characterizations, the reasons that dominate the excellent performance of the assembled all-solid-state sodium battery with NASICON electrolytes is revealed. © 2022, The Authors. All rights reserved.

关键词： Solid electrolytes

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Heterogeneously integrated quantum-dot emitters efficiently driven by a quasi-BIC-supporting dielectric nanoresonator

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Photonics Research 2022年第8期10卷 1971-1977页

作者： LI LIU RUXUE WANG XUYI ZHAO WENFU YU YI JIN QIAN GONG AIMIN WU State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Key Laboratory of Terahertz Solid State Technology Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050China Centre for Optical and Electromagnetic Research and International Research Center for Advanced Photonics College of Optical Science and EngineeringZhejiang UniversityHangzhou 310058China

Bound states in the continuum(BICs) can make subwavelength dielectric resonators sustain low radiation leakage, paving a new way to minimize the device size, enhance photoluminescence, and even realize lasing. Here, we present a quasi-BIC-supporting Ga As nanodisk with embedded In As quantum dots as a compact bright on-chip light source, which is realized by heterogeneous integration, avoiding complex multilayered construction and subsequent mismatch and defects. The emitters are grown inside the nanodisk to match the mode field distribution to form strong light–matter interaction. One fabricated sample demonstrates a photoluminescence peak sustaining a quality factor up to 68 enhanced by the quasi-BIC, and the emitting effect can be further promoted by improving the epilayer quality and optimizing the layer-transferring process in the fabrication. This work provides a promising solution to building an ultracompact optical source to be integrated on a silicon photonic chip for high-density integration.

关键词： emitter resonator dielectric

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Development of a Multi-Chord CO2 Interferometer on Hfrc

SSRN

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SSRN 2023年

作者： Yang, Jingmin Gao, Li Wang, Yajun Rao, Bo Yang, Chengyu Chen, Zhipeng International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China Guangzhou Power Supply Bureau Guangdong Power Grid Co. Ltd China

A multi-chord interferometer system is established on the HUST Field Reversed Configuration (HFRC). Configured as a Mach-Zehnder heterodyne interferometer with seven probe chords distributed in the HFRC middle plane, the system is designed to estimate the integral density within the collisional-merging and compression region of the device. With a spatial resolution of 2cm and a radial coverage range from -7 cm to 31 cm, it provides a density measurement range of 1×1019~1×1020 m-2 . A 10.6μm CO2 laser serves as the laser source, while an acoustic-optic modulator (AOM) generates a modulation frequency of 40 MHz corresponding to a temporal resolution of 25 ns. To reduce frequency drift and vibration noise, a laser interferometric reference chord and a fitting vibration compensation method are implemented. Preliminary experimental results show that the phase resolution within has been achieved, which corresponds to a minimum measurable density of ~2×1018 m-2 . Beyond the density profile measurements, the multi-chord interferometer system plays a pivotal role in observing instabilities of FRC plasmas. © 2023, The Authors. All rights reserved.

关键词： Interferometers

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Photonic Jet with Tunable Focus Based on Water Droplets Freezing from the Outside in 10

Photonic Jet with Tunable Focus Based on Water Droplets Free...

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Nano-optoelectronics and Micro/Nano-photonics X 2024

作者： Minin, Oleg V. Zhou, Song Minin, Igor V. Li, Renxian Jiao, Yuexiao Xiao, Li Shi, Zhuoyuan Zhang, Yuan Wang, Zhe Yang, Ruiping Tang, Huan Siberian State University of Geosystems and Technologies Novosibirsk630108 Russia Jiangsu Key Laboratory of Advanced Manufacturing Technology Faculty of Mechanical and Material Engineering Huaiyin Institute of Technology Huai'an223003 China Novosibirsk Branch of Rzhanov Institute of Semiconductor Physics SBRAS Technological Design Institute of Applied Microelectronics Lavrentieva ave. 2/1 Novosibirsk630090 Russia School of Physics Xidian University Xi'an710071 China School of Physics and Electrical Engineering Weinan Normal University Weinan714099 China

ISBN: (纸本)9781510682160

Water droplets are a highly abundant phase-change material to realize tunable optical lenses. We demonstrated for the first time that freezing mesoscale water droplets could be used as a tunable optical lens, such that freezing becomes an asset despite the low absolute values of the refractive indices of the shell and core materials and their optical contrast. It is shown that the dielectric shell of mesoscale water droplets in solid ice allows controlling both the maximum field intensity and the focus position of the formed photonic nanojet. The ice formation with air bubbles during the freezing of a water droplet is appropriate for a dynamic increase in the range of change of the focal position compared to solid ice. The proposed concept of a tunable spherical lens based on a freezing water drop can be used for microscopy and optical trapping in "green"mesotronics. © 2024 SPIE.

关键词： Refractive index

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Probing dynamics and ion structuring of imidazolium ionic liquid confined at charged graphene surfaces using graphene colloid probe AFM

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摩擦（英文版） 2025年第6期13卷 151-161页

作者： Muqiu Wu Zhongyang Dai Fan Zhang Faiz Ullah Shah Enrico Gnecco Yijun Shi Braham Prakash Rong An School of Materials Science and Engineering/Herbert Gleiter Institute of Nanoscience Nanjing University of Science and TechnologyNanjing 210094China State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China Shandong Laboratory of Advanced Materials and Green Manufacturing at Yantai Yantai 264006China High Performance Computing Department National Supercomputing Center in ShenzhenShenzhen 518055China Department of Engineering and Design School of Engineering and InformationUniversity of SussexBrighton BN1 9RHUK Chemistry of Interfaces Luleå University of TechnologyLuleå 97187Sweden Marian Smoluchowski Institute of Physics Jagiellonian UniversityKrakow 30-348Poland Division of Machine Elements Luleå University of TechnologyLuleå 97187Sweden School of Materials Science and Engineering/Herbert Gleiter Institute of Nanoscience Nanjing University of Science and TechnologyNanjing 210094China Shandong Laboratory of Advanced Materials and Green Manufacturing at Yantai Yantai 264006China

Driven by the potential applications of ionic liquid(IL)flow for charging graphene-based surfaces in many emerging technologies,recent research efforts have focused on understanding ion dynamics and structuring at IL-graphene ***,graphene colloid probe(GrP)atomic force microscopy(AFM)was used to probe the dynamics and ion structuring of 1-butyl-3-methylimidazolium tetrafluoroborate at graphene surfaces under various bias *** particular,the AFM-measured nanofriction provides a good measure of the dynamic properties of the ILs at graphene *** with the IL at the unbiased graphene surface(0 V),the charged graphene surfaces with either negative(-1,-2 V)or positive(+1,+2 V)voltages favor a reduction in the friction coefficient by the IL.A higher magnitude of the bias voltage applied on the graphene surface with either sign(-2 or+2 V)results in a smaller friction coefficient than that at-1 and+1 *** combination with the AFM-probed contact stiffness,adhesion forces,and ion structuring force curves with an ion orientational distribution according to molecular dynamics(MD)simulations,we discovered that the unbiased graphene surface(0 V)possesses randomly structured IL ions and that the graphene colloid probe is more likely to become stuck,resulting in more energy dissipation to contribute to a larger friction *** of the graphene surface under either negative or positive voltages resulted in uniformly arranged ions,which produced a more ordered ion structure and,thus,a smoother sliding plane to reduce the friction *** impedance spectroscopy(EIS)for the IL with graphene as an electrode demonstrated a greater ionic conductivity in the IL paired with the biased graphene than in the unbiased one,implying faster ion movement at the charged graphene,which is beneficial for reducing the friction coefficient.

关键词： nanofriction graphene charge ionic liquid(IL) IL arrangement simulation

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Insulator Defect Detection Based on Improved YOLOv5 Model

Insulator Defect Detection Based on Improved YOLOv5 Model

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Software engineering and Artificial Intelligence (SEAI), IEEE International Conference on

作者： Yongxin Chen Zhenan Du Hengxuan Li Kanjun Zhang Pei Wen State Grid Hubei Electric Power Research Institute Wuhan Hubei China State Key Laboratory of Advanced Electromagnetic Engineering and Technology (HUST) Wuhan Hubei China State Grid Hubei Electric Power Co. Ltd Wuhan Hubei China NR Electric Co. Ltd Nanjing Jiangsu China

ISBN: (数字)9798350374346

ISBN: (纸本)9798350374353

In the power system, insulator is a very important type of power equipment. The defects in insulator will directly affect the stability of the system and the safety of workers. In order to quickly and accurately detect the defect of insulators in the high-voltage lines of the power grid, a detection method based on improved YOLOv5 model is proposed. For the convolutional layers in CSPLayer modules which are associated with feature output, self attention mechanism is introduced to improve the feature extraction ability of the model; and deep separable convolution is introduced to improve the detection efficiency. The experimental study is performed by comparing the proposed model with Faster R-CNN, YOLOv3, YOLOv4, and YOLOv5s. The experimental results show that the average detection accuracy of the proposed model is 94.79%, and the detection speed is 63.9FPS, which is superior to other methods under the same conditions.

关键词： YOLO Accuracy Attention mechanisms Convolution Power system stability Insulators Feature extraction

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First-Principles Study on the Cu-Cr Interfaces in Vacuum Circuit Breaker Contacts

SSRN

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SSRN 2023年

作者： Gui, Xianxian Wu, Chuanqi Yuan, Zhao Liu, Liming Wang, Cao Chen, Lixue Liu, Xueliang Ye, Jingjing Liu, Shan State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Hubei Wuhan430074 China Key Lab Pulsed Power Technol Minist Educ School of Electrical and Electronic Engineering Hubei Wuhan430074 China State Grid Hubei Electric Power Research Institute Hubei Wuhan430077 China

Based on the experimental phenomenon that the breakdown position of the CuCr contact head in a vacuum circuit breaker may be the Cu-Cr phase boundary, the Cu-Cr interfacial binding models have been developed. The work function, density of states, work of interfacial separation, interfacial energy, charge transfer, band energy, and charge density distribution of Cu, Cr and Cu-Cr phase boundaries are calculated from the first principles. The internal properties of CuCr contact breakdown have been analyzed from the microscopic atomistic point of view. The CuCr interface junction was found to have a smaller work function than pure copper and pure chromium. The reduced work function is prone to field emission, thus increasing the possibility of electrical breakdown. Three interfacial binding models Cu(110)/Cr(110), Cu(111)/Cr(111) and Cu(110)/Cr(100) are established in this paper. By comparing the separation work and interfacial energy, it is found that Cu(111)/Cr(111) is relatively stable. In this paper, we provide a theoretical basis for increasing the voltage strength of vacuum circuit breakers. © 2023, The Authors. All rights reserved.

关键词： Timing circuits

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From a design strategy for metamaterial sensors to interdigitated metamaterial sensors

From a design strategy for metamaterial sensors to interdigi...

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International Conference on Infrared and Millimeter Waves

作者： Lei Cao Fanqi Meng Yannik Loth Merle Richter Anna Katharina Wigger Maira Pérez Sosa Alaa Jabbar Jumaah Shihab Al-Daffaie Peter Haring Bolívar Hartmut G. Roskos State Key Laboratory of Advanced Electromagnetic Technology Huazhong University of Science and Technology Wuhan China Physikalisches Institute Goethe-Universität Frankfurt Frankfurt am Main Germany Institute for High Frequencies and Quantum Electronics University of Siegen Siegen Germany Department of Electrical Engineering Eindhoven University of Technology AE Eindhoven Netherlands

ISBN: (数字)9798350370324

ISBN: (纸本)9798350370331

We present a strategy for the design of metamaterial sensors to be used for detecting small amounts of dielectric materials by the shift of the metamaterial’s resonance frequency. The amount of frequency shift depends on intrinsic properties (electric field distribution, Q-factor, and mode volume) of the metamaterial’s bare resonators, as well as the overlap volume of its high-electric-field zone(s) and the analyte. Guided by the simplified dielectric perturbation theory, interdigitated electric split-ring resonators (ID-eSRR) are devised to significantly enhance the detection sensitivity compared to eSRRs without interdigitated fingers. The ID-eSRR's fingers redistribute the electric field, creating strongly localized field enhancement which boosts interaction with the analyte. Furthermore, the periodic change of field direction in the region of the interdigitated fingers significantly reduces radiation loss, leading to a higher Q-factor. Experiments with ID-eSRR sensors operating at around 300 GHz demonstrate a remarkable 33.5-GHz frequency shift upon deposition of a 150-nm-thick SiO 2 layer as an analyte simulant, with a figure of merit (FOM) improvement of over 50 times compared to structures without interdigitated fingers. This rational design offers a promising avenue for the development of highly sensitive detectors of thin dielectric films and trace amounts of biomolecules.

关键词： Q-factor Silicon compounds Time-frequency analysis Sensitivity Fingers Resonant frequency Metamaterials Sensors Resonators Electric fields

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