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Enhanced energy storage performance of Mn-doped NBT-based flexible films by defect engineering

Journal of Alloys and Compounds 2025年 1010卷

作者： Ning, Lei Luo, Xia Sun, Ningning Li, Yong Han, Pei Li, Xiaowei Hao, Xihong Inner Mongolia Key Laboratory of Advanced Ceramic Material and Devices School of Materials Science and Engineering Inner Mongolia University of Science and Technology Baotou014010 China Ministry of Education Baotou014010 China Yunnan Key Laboratory of Electromagnetic Materials and Devices National Center for International Research on Photoelectric and Energy Materials School of Materials and Energy Yunnan University Kunming650091 China

The rapid development of advanced flexible electronics leads to higher demands on the energy storage performance and spatial adaptability of capacitors. Here, Mn2+ is doped into 0.6(Na0.5Bi0.5)TiO3-0.4Bi(Mg0.5Zr0.5)O3 (0.6NBT-0.4BMZ), which effectively reduces the carrier content by forming defective complexes through the bonding of Mn2+ with oxygen vacancies, while maintaining a relatively high polarizability and enhancing the breakdown strength. The optimal storage performance is demonstrated by the 0.6NBT-0.4BMZ film with a Mn doping amount of 1 mol%. The observed breakdown strength, storage density, and storage efficiency are 2900 kV/cm, 60.2 J/cm3, and 60.3 %, respectively. Furthermore, the films exhibit excellent stability in various temperature ranges (25–205 ℃), frequencies (1–5 kHz), fatigue tests (at 107 charge/discharge cycles), and bending resistance tests (20,000 cycles/radius R ≈ 2 mm). These results indicate that NBT-based film materials hold great promise for future flexible energy storage applications. © 2024

关键词： Fatigue testing

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Terahertz Metamaterial Sensor in a High-Q Photonic Crystal Cavity

Terahertz Metamaterial Sensor in a High-Q Photonic Crystal C...

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International Conference on Infrared and Millimeter Waves

作者： Lei Cao Shanshan Jia Mark D. Thomson Fanqi Meng Hartmut G. Roskos State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China Physikalisches Institut Goethe-University Frankfurt Frankfurt am Main Germany

ISBN: (数字)9781728194271

ISBN: (纸本)9781728194288

We investigate whether metamaterial (MM) embedded in a one-dimensional high-Q photonic crystal (PC) cavity has the potential to be a better terahertz (THz) sensor than a MM (or a PC cavity) alone, when the MM strongly couples with the cavity photons. The resonant frequency shift induced by an analyte on the MM in the cavity is smaller than that obtained with the MM alone. This is attributed to the larger mode volume according to the dielectric perturbation theory. However, the phase sensitivity of the MM is larger than that of the MM alone, which opens a new route for the realization of improved THz phase-sensitive sensors.

关键词： Terahertz metamaterials Sensitivity Perturbation methods Resonant frequency Photonic crystals Metamaterials Dielectrics

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Research on the Hydropower Generation Optimal Scheduling of Larger-Scale Cascade Hydropower Stations on Jinsha River and Lancang River 14

Research on the Hydropower Generation Optimal Scheduling of ...

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14th International Conference on Computer and Electrical engineering, ICCEE 2021

作者： Si, Dajun Wang, Yuan Liang, Shuhao Wu, Yaowu Zhang, Wangxi Huang, Shiru Wang, Bingran Power Grid Planning and Construction Research Center Yunnan Power Grid Co. Ltd. Kunming China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan430074 China

There are some characteristics, such as multi-dimensional, stochastic inflow, non-uniform service and scheduling subjects, in optimal scheduling of power generation. The problem is also subjected to hydrological and meteorological conditions, operation control, water demand, and loads of the power grid. Aiming at the electric power and energy balance problem in the high hydropower system, this paper uses the typical annual load curve to analyse the electricity power and energy balance, so as to better consider the influence of seasonal differences in hydrological conditions on the storage capacity of adjustable hydropower stations and the start-up of thermal power stations, and establish a mid-long term model of hydropower generation optimal scheduling of large-scale cascade hydropower stations. Taking the cascade hydropower stations in the Jinsha River and Lancang River as examples for simulation analysis, and using GUROBI to solve the model, the correctness and effectiveness of the proposed optimal scheduling model are verified. © Published under licence by IOP Publishing Ltd.

关键词： Rivers

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Research on Mesh Generation technology Based on Delaunay Triangulation

Research on Mesh Generation Technology Based on Delaunay Tri...

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International Conference on Vacuum Electronics

作者： Longwei Deng Junhui Yin Qing He Xinyu Cao Chaoyang Zhang Junhao Cui Bin Li National Key Laboratory of Science and Technology on Vacuum Electronics Key Laboratory of Large-Scale Electromagnetic Industrial Software Ministry of Education School of Electronic Science and Engineering University of Electronic Science and Technology of China Chengdu P. R. China Shenzhen Institute for Advanced Study University of Electronic Science and Technology of China Shenzhen P. R. China

ISBN: (数字)9798350348705

ISBN: (纸本)9798350348712

With advancements in computer technology, modeling and simulation have become increasingly important in reducing development costs and enhancing performance. And the core of simulation is mesh generation, the first and most fundamental step in numerical computations. In this paper, utilizing the Delaunay triangulation method, we've developed a three-dimensional mesh generator for microwave tube structures, for significantly enhancing mesh quality and stability. Additionally, the mesh optimization algorithm based on Quasi-Newton method effectively refines poor-quality meshes, a crucial step towards ensuring a numerical simulation reliability under various operational conditions. The numerical results have shown the success of the implemented mesh optimization algorithm, particularly in significantly improving the quality of poor-quality mesh elements. This mesh generator will be incorporated as a core component of Microwave Tube Simulator Suite.

关键词： Microwave technology Shape Numerical simulation Generators Stability analysis Robustness Vacuum electronics Optimization Mesh generation Numerical stability

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Improved stability and electronic homogeneity in perovskite solar cells via a nanoengineered buried oxide interlayer

EES Solar

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EES Solar 2025年第2期1卷 115-128页

作者： W. Hashini K. Perera Tony J. Woodgate Dong Kuk Kim Rachel C. Kilbride Mateus G. Masteghin Christopher T. G. Smith Steven J. Hinder Sebastian Wood K. D. G. Imalka Jayawardena S. Ravi P. Silva Advanced Technology Institute School of Computer Science and Electronic Engineering University of Surrey Guildford Surrey GU2 7XH UK Electromagnetic and Electrochemical Technologies Department National Physical Laboratory Teddington Middlesex UK Department of Chemistry University of Sheffield Sheffield S3 7HF UK The Surface Analysis Laboratory Faculty of Engineering and Physical Sciences University of Surrey Guildford Surrey GU2 7XH UK

Self-assembled monolayers (SAMs) are a popular choice for achieving high-efficiency perovskite solar cells (PSCs). However, the incomplete wetting of the perovskite on (4-(3,6-dimethyl-9H-carbazol-9-yl)butyl)phosphonic acid (Me-4PACz) SAMs in PSCs has proven to be a challenge. Recently, the use of surface modifiers such as alumina nanoparticles and poly(9,9-bis(3′-(N,N-dimethyl)-N-ethylammonium-propyl-2,7-fluorene)-alt-2,7-(9,9-dioctylfluorene))dibromide (PFN–Br) has been demonstrated to eliminate this bottleneck. However, the influence of these surface modifiers on device stability has not been reported. Here, we studied the influence of alumina nanoparticles and PFN–Br on Me-4PACz device stability when stressed under ISOS-D-2I and ISOS-D-2 conditions (at 65 °C). The use of alumina nanoparticles leads to efficient scavenging of iodine, improved bulk electrical and surface electronic homogeneity in fresh films, which is preserved even when the films are degraded, and the formation of 2D perovskites, which act as a barrier against moisture induced degradation. In comparison, perovskites based on PFN–Br show a distinct lack of similar characteristics for fresh and degraded samples. This allows the realisation of alumina modified Me-4PACz based PSCs with a tenfold improved T80 lifetime of 1530 h under ISOS-D-2 conditions compared to the PFN–Br based device stack. Our study uncovers a new approach towards enhancing PSC stability, which could potentially be applied under more strenuous ISOS test conditions to further improve device stability.

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Continuous-trajectory robust unit commitment considering beyond-the-resolution uncertainty

Continuous-trajectory robust unit commitment considering bey...

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2020 IEEE Power and Energy Society General Meeting, PESGM 2020

作者： Zhou, Bo Ai, Xiaomeng Fang, Jiakun Yao, Wei Wen, Jinyu Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Wuhan China

ISBN: (纸本)9781728155081

To guarantee the operational security of the renewable power system, the uncertainty of renewable energy generation (REG) should be fully considered. However, the traditional robust unit commitment (RUC) cannot access the variation of REG inside the operational period. Hence, this paper proposes the continuous-trajectory (CT) RUC considering the beyond-the-resolution (BtR) uncertainty. The critical impact factors characterizing the BtR variation are analyzed, and then the BtR uncertainty is modeled. The mathematical formulation of CT-RUC is derived and shifted from the time domain to the time-dependent function space so that the optimization can be tractably solved. The comparison between traditional RUC and CT-RUC demonstrates that the consideration of the BtR uncertainty can result in a more robust solution. © 2020 IEEE.

关键词： Trajectories

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A damping control strategy for torsional oscillations of DFIG-based WTs caused by inertia control

A damping control strategy for torsional oscillations of DFI...

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2020 IEEE Power and Energy Society General Meeting, PESGM 2020

作者： Zhang, Xiaojie Hu, Jiabing He, Wei Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Wuhan China

ISBN: (纸本)9781728155081

As wind power plays an increasingly important role in power systems, the safe and steady operation of wind turbines is causing more attention. The torsional oscillation in doubly fed induction generation based (DFIG-based) wind turbines (WTs) is a serious problem reducing service life of mechanical component. However, as the grid codes require wind farms to participate in frequency response, the application of inertia control may make the issue more significant. This paper presents a damping control strategy for suppressing torsional oscillation of DFIG-based WTs' drive-train caused by the inertia control. Different from the existing damping control schemes, the proposed damping control is based on modulation of reactive current of grid-side converter. This kind of control scheme can effectively restrain torsional oscillation without increasing the complexity of torque control or speed control. Time-domain simulations are performed to demonstrate the efficacy of the proposed control scheme. © 2020 IEEE.

关键词： Wind turbines

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Comparison of Two Hollow-Shaft Liquid Cooling Methods for High Speed Permanent Magnet Synchronous Machines 12

Comparison of Two Hollow-Shaft Liquid Cooling Methods for Hi...

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12th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2020

作者： Wang, Runyu Fan, Xinggang Li, Dawei Qu, Ronghai Huazhong University of Science and Technology School of Electrical and Electronic Engineering State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9781728158266

The rotor cooling poses a significant challenge for high speed permanent magnet synchronous machines (PMSMs). This paper presents a recirculating hollow-shaft liquid cooling structure. Through the computational fluid dynamics (CFD) method, its convective heat transfer coefficient (CHTC) and friction loss are studied in depth. Besides, the recirculating hollow-shaft is compared with the direct-through hollow-shaft. Based on the CFD analysis, it is found that the recirculating hollow-shaft has higher friction loss. But the CHTC of the recirculating hollow-shaft is higher than that of the direct-through hollow-shaft, which can be as high as 32%. Finally, the cone-shaped structure and blade structure are used to optimize the recirculating hollow-shaft, increasing its CHTC by 49%. The cooling effect of the optimized recirculating hollow-shaft structure is more prominent, especially when the rotor loss is large. © 2020 IEEE.

关键词： Heat transfer coefficients

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Two-dimensional calculation of axisymmetric coils and permanent-magnet system in MFS

Two-dimensional calculation of axisymmetric coils and perman...

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International Conference on Vacuum Electronics

作者： Ling Mei Quan Hu Xiaofang Zhu Yulu Hu Xiaobing Wang Huijiao Zhang Jike Yang Zhenting Qin Bin Li National Key Laboratory of Science and Technology on Vacuum Electronics Key Laboratory of Large-Scale Electromagnetic Industrial Software Ministry of Education School of Electronic Science and Engineering University of Electronic Science and Technology of China Chengdu P. R. China Shenzhen Institute for Advanced Study University of Electronic Science and Technology of China Shenzhen P. R. China

ISBN: (数字)9798350348705

ISBN: (纸本)9798350348712

Magnetic focusing system usually adopts permanent magnet focusing system and electromagnetic focusing system(coil). To extend the function of MFS, the Magnet Field Solver of MTSS, which is mainly used for PPM system design, the magnetic vector potential method is studied and used to calculate the axisymmetric magnetic field of the magnetic focusing system including coil, permanent magnet and pole piece. The accuracy of the proposed method has been verified.

关键词： Coils Accuracy Vacuum systems Magnetic domains Focusing Permanent magnets Vectors Vacuum electronics Magnetic fields System analysis and design

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Research on a Fundamental and Harmonic Detection Method Based on D-Q Rotating

Research on a Fundamental and Harmonic Detection Method Base...

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2020 International Conference on Ubiquitous Power Internet of Things, UPIOT 2020 and 4th International Symposium on Green Energy and Smart Grid, SGESG 2020

作者： Gong, Jie Xue, Feng Zhang, Guangyi Pan, Wenhao Wang, Tingkang State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China

The widespread use of power electronics in power systems has led to increasingly serious power quality problems in power systems. Active power filters play an important role in governing the harmonics of power systems. The fast and accurate detection of fundamental and harmonic currents in power systems is one of the key aspects of power filters to manage harmonics. In this paper, a new detection method for the fundamental or the nth harmonic component of the fundamental by presetting the frequency of the d-q conversion matrix is proposed. Analysis of simulation results shows that the detection method is not affected by the voltage distortion or asymmetry of the three-phase circuit, and that the results for fundamental and harmonic detection. The ability to accurately reflect changes in frequency and amplitude excursions. © Published under licence by IOP Publishing Ltd.

关键词： Harmonic analysis

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