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4th IEEE China International Youth Conference on Electrical engineering, CIYCEE 2023

作者： Chen, Yangfan Zhao, Mengyuan Zhang, Yu School of Electrical and Electronics Engineering State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan430074 China

ISBN: (纸本)9798350305562

To improve the load capability, operating efficiency and power density of the DC distribution power systems (DDPSs), the application of dual-terminal structure (DTS) composed of multiple DC transformers (DCTs) is widely expanding. Focusing on the cascaded stability, the active damping methods for DCTs are widely researched to suppress the oscillation. However, there are few studies discussing whether the DDPS composed of DCTs controlled by active damping methods is still stable. Therefore, this paper firstly builds an impedance model for a DTS DDPS. Then, the stability of a DTS DDPS composed of all-active-damping-controlled DCTs is evaluated based on the Nyquist Criterion. Finally, simulation results show that a DTS DDPS is stable with a high margin when composed of all-active-damping-controlled DCTs, which has fast dynamic speed and good balance ability. © 2023 IEEE.

关键词： DC transformers

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Facile and effective synthesis strategy for terbium-doped hydroxyapatite toward photoelectric devices and flexible functional fibers

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Rare Metals 2024年第4期43卷 1713-1723页

作者： Xiao-Dong Zhang Kun Nie Zi-Yao Hu Ran-Ran Zhou Xiu-Qiang Duan Wu-Bin Dai Song-Song Nie Song-Jun Yao Luo-Xin Wang Le-Fu Mei Hua Wang Yi-Yi Yao Xiao-Xue Ma Hubei Key Laboratory for New Textile Materials and Applications and State Key Laboratory of New Textile Materials and Advanced Processing Technology School of Materials Science and EngineeringWuhan Textile UniversityWuhan430200China Key Laboratory of Testing and Tracing of Rare Earth Products for State Market Regulation Jiangxi University of Science and TechnologyGanzhou341000China Hubei Key Laboratory of Plasma Chemistry and Advanced Materials and Key Laboratory of Green Chemical Engineering Process of Ministry of Education Wuhan Institute of TechnologyWuhan430205China

As a material with good biocompatibility,hydroxyapatite(HAP)can have optical properties after doping with various rare earth *** a biocompatible fluorescent material,doped HAP could have broad applications in biological probes,drug delivery,optoelectronic materials,fluorescence anti-counterfeiting,and other *** this paper,we put forward the preparation of HAP doped with terbium(Ⅲ)ions(Tb^(3+))by hydrothermal *** controlling the Tb^(3+)doping content in reaction and the reaction time,the changes in HAP's structure,morphology,and luminescence properties under different conditions were *** the doping amount of Tb^(3+)reached an optimal value,the dipole-quadrupole would occur and the concentration would be *** control experiment showed that the optimal Tb3+content was 7.5×10^(-5)mol,which showed the best fluorescence ***,a non-luminous material,was rarely used in the field of fluorescent anti-counterfeiting and photoelectric *** proposed to prepare a luminescent aramid/polyphenylene sulfide(ACFs/PPS)fiber paper and a new light-emitting diode(LED)using the Tb-doped HAP *** composite sample exhibited an excellent stability and fluorescence performance,which also demonstrated a possibility of HAP applications in anticounterfeiting and *** introduction of Tb3+dopant HAP was done to give HAP optical properties and broaden the application range of HAP.

关键词： Hydroxyapatite Rare earth luminescence Photoelectric device Aramid Polyphenylene sulfide fiber paper Luminescent fiber

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An Improved Method for Combining the Power Station Operation Modes Based on the Variation Trend of the Power Source Contribution Coefficient 37th

An Improved Method for Combining the Power Station Operation...

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37th Annual Conference on Power System and Automation in Chinese Universities, CUS-EPSA 2022

作者： Zou, Yi Ren, Kangjie Li, Yinhong State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan430074 China

ISBN: (纸本)9789819914388

The combination of operation modes in relay protection setting calculation is the basis to ensure the correct action of the relay protection device. The power source contribution coefficient method combines the power station operation modes in calculating positive-sequence auxiliary increasing coefficient. It has the characteristics of calculating all stations, having a small number of combinations, and possibly requiring iterative calculations in the ring network. Based on this, this paper analyzes the effect of station location on the auxiliary increasing coefficient and discusses the iterative problem in ring networks. An improved method for combining the power station operation modes based on the variation trend of the power source contribution coefficient is proposed. Based on the variation trend, all the power stations with clustering errors are screened out in advance, which will be re-divided into the correct clustering. The auxiliary increasing coefficient can be worked out by setting the same operation mode for the stations in the same clustering group. Simulation case shows that the improved method can realize correct station clustering, avoid multiple iterative calculations, and ensure efficiency. The work was supported by the state Grid Corporation Science and technology Project under Grant 5100-202199558A-0-5-ZN. © 2023, state Grid Electric Power.

关键词： Relay protection

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Designing carboxymethyl cellulose based hydrogel electrolyte membranes enhanced by inorganic nanoparticle toward stable zinc anode

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Green Energy & Environment 2025年第3期10卷 537-550页

作者： Xiangye Li Yuan Li Yu Jiang Dahui Wang Fen Ran State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals Department of Polymeric Materials EngineeringSchool of Material Science and EngineeringLanzhou University of TechnologyLanzhou730050China

Aqueous zinc metal batteries have garnered substantial attention ascribing to affordability,intrinsic safety,and environmental benignity Nevertheless,zinc metal batteries yet are challenged with potential service life issues resulted from dendrites and side *** this paper,a strategy of nanoparticles doped hydrogel is proposed for constructing carboxymethyl cellulose/graphite oxide hybrid hydrogel electrolyte membranes with exceptional ionic conductivity,anti-swelling property,and simultaneously addressing the dendrites and parasitic *** pivotal functions of the carboxymethyl cellulose/graphite oxide hydrogel electrolyte in mitigating hydrogen evolution and fostering accelerated Zn deposition have been elucidated based on principles of thermodynamic and reaction *** carboxymethyl cellulose/graphite oxide hydrogel electrolyte endows exceptional cycling longevity (800 h at 1 mA cm^(-2)/1 mAh cm^(-2)) for Znjj Zn battery,as well as high Coulombic efficiency for Znjj Cu battery (averagely 99.14%within 439 cycles at 1 mA cm^(-2)/1 mAh cm^(-2)).The assembled Znjj NH_(4)V_(4)O_(10)battery delivers a high reversible specific capacity of 328.5 mAh g^(-1)at 0.1 A g^(-1).Moreover,the device of Znjj NH_(4)V_(4)O_(10)pouch battery remains operational under severe conditions like bending and *** work provides valuable reference in developing inorganic nanoparticle hybrid hydrogel electrolyte for realizing high-performance zinc metal batteries.

关键词： Carboxymethyl cellulose Graphite oxide Hydrogel electrolyte Anti-swelling

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Enhanced steelmaking cost optimization and real-time alloying element yield prediction: a ferroalloy model based on machine learning and linear programming

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Journal of Iron and Steel Research International 2025年第4期32卷 904-919页

作者： Rui-xuan Zheng Yan-ping Bao Li-hua Zhao Li-dong Xing State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing100083China School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing100083China

The production of ferroalloys is a resource-intensive and energy-consuming *** mitigate its adverse environmental effects,steel companies should implement a range of measures aiming at enhancing the utilization rate of ***,a comprehensive ferroalloy model was proposed,incorporating a prediction model for alloying element yield based on case-based reasoning and support vector machine(CBR-SVM),along with a ferroalloy batching model employing an integral linear programming *** simulation calculations,the prediction model exhibited exceptional predictive performance,with a hit rate of 96.05%within 5%.The linear programming ingredient model proved effective in reducing costs by 20.7%,which was achieved through accurate adjustments to the types and quantities of *** proposed method and system were successfully implemented in the actual production environment of a specific steel plant,operating seamlessly for six *** implementation has notably increased the product quality of the enterprise,with the control rate of high-quality products increasing from 46%to 79%,effectively diminishing the consumption and expenses associated with *** reduced usage of ferroalloys simultaneously reduces energy consumption and mitigates the adverse environmental impact of the steel industry.

关键词： Steel industry Ferroalloy Case-based reasoning Energy conservation Consumption reduction

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Ozone Generation by DC Needle-Needle Discharge at Atmospheric Pressure 3

Ozone Generation by DC Needle-Needle Discharge at Atmospheri...

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3rd International Conference on Energy, Power and Electrical engineering, EPEE 2023

作者： Wang, Weiyi Li, Mengqi Wang, Bingkai Xiong, Zilan Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan430074 China

ISBN: (纸本)9798350318180

In this study, the effect of discharge gap and applied voltage on the ozone generation by DC needle-needle discharge was investigated. The relationship between the production efficiency and the energy cost as well as the generation rate were discussed. It has been found that under all experimental conditions, the ozone concentration increased with processing time, but under the same gap distance, the ozone concentration and generation rate initially increased and then decreased with the increase of the applied voltage and injected energy. The energy cost of ozone generation under the discharge power and the total power were calculated and compared. The energy cost basically increased with the applied voltage and power consumption. Therefore, to obtain the optimal parameters for ozone production, both the energy cost and the generation rate should be considered. © 2023 IEEE.

关键词： air plasma energy cost needle-needle discharge ozone generation

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A Two-stage EV Wireless Charging System Based on LCC-S Resonance and Its Wide Input and Output Voltage Range Control Method 26

A Two-stage EV Wireless Charging System Based on LCC-S Reson...

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26th International Conference on Electrical Machines and Systems, ICEMS 2023

作者： Tan, Xiangwen Duan, Shanxu Li, Yong Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Hubei Wuhan China

ISBN: (纸本)9798350317589

With the gradual popularization of electric vehicle (EV), wireless charging has become an important method for EV charging due to its convenience, safety and environmental adaptability. Traditional EV wireless charging systems often adopt a three-stage architecture, resulting in low energy efficiency and high manufacturing costs. This paper presents a two-stage electric vehicle wireless charging system based on LCC-S resonance to realize wireless power transmission with high efficiency and low grid current ripple. The limiting factors of the output voltage range are analyzed, and an output voltage control method combining DC bus voltage regulation and full-bridge phase-shifting is designed. The charging system can satisfy the grid voltage range of S5-265V and vehicle side voltage range of 300-450V, and can tolerate the variation of coupling coefficient. The simulation result shows that the system efficiency is 93% and the current THD can get less than 1%. © 2023 IEEE.

关键词： Electric vehicles

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Single-Pole Fault Injection Directional Pilot Protection for Flexible DC Lines 17th

Single-Pole Fault Injection Directional Pilot Protection for...

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17th Annual Conference of China Electrotechnical Society, CES 2022

作者： Ma, Ruizhi Wen, Minghao Chen, Yu Han, Ke Wang, Xingzhu Han, Xiangyu State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan430074 China

ISBN: (纸本)9789819904075

In the case of single-pole ground fault on the transmission line of MMC-based DC system, the single-ended protection has poor endurance to high-impedance faults, while the double-ended protection performance is limited by the pilot channel. This paper proposed a pilot protection scheme using sound pole active injection of feature signals. Based on the controlled characteristics of hybrid MMC during DC line faults, the DC fault ride-through control strategy is developed considering the requirements of relay protection, using the sound pole commutation valve to actively inject the feature frequency sinusoidal signal into the line during single pole faults, and realizing the fault direction information interaction through the detection of the feature frequency signal to achieve fault discrimination within and outside the DC line. Simulation results show that the protection algorithm proposed in the paper accurately identifies the fault area under the condition of a single pole fault with 500 Ω transition resistance within 10 ms after the fault. The protection scheme does not depend on the pilot channel and line boundary elements and requires low sampling rate. © 2023, Beijing Paike Culture Commu. Co., Ltd.

关键词： Poles

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Enhancing properties of high-entropy alloys via manipulation of local chemical ordering

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Journal of Materials Science & technology 2024年第13期180卷 23-31页

作者： Yihan Wang Meiyuan Jiao Yuan Wu Xiongjun Liu Hui Wang Suihe Jiang Xiaobin Zhang Zhaoping Lu Beijing Advanced Innovation Center for Materials Genome Engineering State Key Laboratory for Advanced Metals and MaterialsUniversity of Science and Technology BeijingBeijing 100083China

*** High entropy alloys(HEAs),arising from the incorporation of multiple principal elements[1,2],have garnered extensive atten-tion due to their great potential to be utilized under extreme con-ditions[3-5].

关键词： alloys entropy utilized

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Femtosecond laser-induced periodic surface structures on hard and brittle materials

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Science China(Technological Sciences) 2024年第1期67卷 19-36页

作者： ZHAO GuoXu WANG Gong LI YunFei WANG Lei LIAN YuDong YU Yu ZHAO Hui WANG YuLei LU ZhiWei Center for Advanced Laser Technology Hebei University of TechnologyTianjin 300401China Hebei Key Laboratory of Advanced Laser Technology and Equipment Tianjin 300401China State Key Laboratory of Integrated Optoelectronics College of Electronic Science and EngineeringJilin UniversityChangchun 130012China School of Information and Electrical Engineering Hebei University of EngineeringHandan 056038China

Hard and brittle materials have high hardness,excellent optical stability,chemical stability,and high thermal ***,they have huge application potential in various fields,such as optical components,substrate materials,and quantum information,especially under harsh conditions,such as high temperatures and high *** laser direct writing technology has greatly promoted the development of femtosecond laser-induced periodic surface structure(Fs-LIPSS or LIPSS by a femtosecond laser)applications of hard and brittle materials due to its high precision,controllability,and three-dimensional processing *** far,LIPSSs have been widely used in material surface treatment,optoelectronic devices,and ***,a consensus has not been reached regarding the formation mechanism of LIPSSs on hard and brittle *** this paper,three widely accepted LIPSS formation mechanisms are introduced,and the characteristics and applications of LIPSSs on diamonds,silicon,silicon carbide,and fused silica surfaces in recent years are *** addition,the application prospects and challenges of LIPSSs on hard and brittle materials by a femtosecond laser are discussed.

关键词： laser-induced periodic surface structures hard and brittle materials femtosecond laser

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