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Finite element method implementation of the nonlinear damage evolution model for piezoelectric material under bipolar electrical fatigue load

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Finite element method implementation of the nonlinear damage...

Ultrafine Fe/Fe3C decorated on Fe-N_(x)-C as bifunctional oxygen electrocatalysts for efficient Zn-air batteries

中国力学大会-2021+1

作者： Xianghua Chen State Key Laboratory for Strength and Vibration of mechanical Structures School of Aerospace EngineeringXi’an Jiaotong University

Introduction Predicting nonlinear damage evolution of piezoelectric materials is essential for the reliability and life prediction of piezoelectric structures and *** this paper,a nonlinear damage evolution finite element model and its corresponding acceleration program are proposed which are capable of modeling nonlinear damage evolution of piezoelectric material and structure under electric fatigue load.

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Journal of Energy Chemistry 2021年第5期30卷 72-79页

作者： Lingbo Zong Xin Chen Siliang Liu Kaicai Fan Shuming Dou Jie Xu Xiaoxian Zhao Wenjun Zhang Yaowen Zhang Weicui Wu Fenghong Lu Lixiu Cui Xiaofei Jia Qi Zhang Yu Yang Jian Zhao Xia Li Yida Deng Yanan Chen Lei Wang Taishan Scholar Advantage and Characteristic Discipline Team of Eco Chemical Process and Technology Key Laboratory of Optic-electric Sensing and Analytical Chemistry fo r Life ScienceMOEState Key Laboratory of Eco-chemical EngineeringCollege of Chemistry and Molecular EngineeringQingdao University of Science and TechnologyQingdao 266042ShandongChina school of Materials Science and engineering Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of EducationTianjin Key Laboratory of Composite and Functional MaterialsTianjin UniversityTianjin 300072China Centre for Clean Environment and Energy School of Environment and ScienceGriffith UniversityQueensland 4222Australia College of Science Hebei Agricultural UniversityBaoding 071001HebeiChina Key Laboratory of Rubber-Plastics Ministry of Education/Shandong Provincial Key Laboratory of Rubber-PlasticsQingdao University of Science and TechnologyQingdao 266042ShandongChina College of Materials Science and engineering Qingdao University of Science&TechnologyQingdao 266042ShandongChina

Efficient bifunctional oxygen electrocatalysts for ORR and OER are fundamental to the development of high performance metal-air ***,a facile cost-efficient two-step pyrolysis strategy for the fabrication of a bifunctional oxygen electrocatalyst has been *** efficient non-preciousmetal-based electrocatalyst,Fe/Fe_(3)C@Fe-N_(x)-C consists of highly curved onion-like carbon shells that encapsulate Fe/Fe_(3)C nanoparticles,distributed on an extensively porous graphitic carbon *** obtained Fe/Fe_(3)C@Fe-N_(x)-C aerogel exhibited superb electrochemical activity,excellent durability,and high methanol *** experimental results indicated that the assembly of onion-like carbon shells with encapsulated Fe/Fe_(3)C yielded highly curved carbon surfaces with abundant Fe-Nxactive sites,a porous structure,and enhanced electrocatalytic activity towards ORR and OER,hence displaying promising potential for application as an air cathode in rechargeable Zn-air *** constructed Zn-air battery possessed an exceptional peak power density of~147 mW cm^(-2),outstanding cycling stability(200 cycles,1 h per cycle),and a small voltage gap of 0.87 *** study offers valuable insights regarding the construction of low-cost and highly active bifunctional oxygen electrocatalysts for efficient air batteries.

关键词： Non-precious metal Nitrogen-rich carbon Fe/Fe_(3)C Fe-N_(x)-C Bifunctional oxygen electrocatalysts

Framework for Artificial Intelligence Analysis in Large-scale Power Grids Based on Digital Simulation

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CSEE Journal of Power and Energy Systems 2018年第4期4卷 459-468页

作者： Yong Tang Yanhao Huang Hongzhi Wang Can Wang Qiang Guo Wei Yao State Key Laboratory of Power Grid Safety and Energy Conservation China Electric Power Research InstituteBeijing 100192China College of Computer Science at Harbin Institute of Technology Harbin 150001China College of Computer Science at Zhejiang University Hangzhou 310027China State Key Laboratory of Advanced Electromagnetic engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China

The planning,design,operation,control and scientific research of power systems all require a variety of simulation *** power grid simulation analysis is a fundamental supporting technology of large-scale power *** power grid simulation analysis,in addition to simulation calculations,there are many links for analysis and decision-making,relying on *** introduction of advanced artificial intelligence technology provides a new method to improve the efficiency and accuracy of power grid simulation ***,the research of the related artificial intelligence technologies face a great deal of new challenges due to the complexity of the largescale power grid simulation data,including massive volumes,high dimensionality,strong coupling and complex *** a great deal of knowledge and experience need to be integrated in the process of *** order to deal with these challenges,based on the existing works,this paper focuses on the core scientific problem of artificial intelligence analysis and decision making related to the massive simulation results of large-scale power grids,and proposes an artificial intelligence analysis method framework for large-scale power grids based on digital simulation,which includes the power grid simulation analysis knowledge model with application method,the power grid simulation knowledge mining method and the artificial intelligence models with transfer learning ability of diversified grids as well as analyzing and calculation adjusting for largescale power grid simulation results,*** work is expected to open up a new technical approach for large-scale power grid simulation analysis and provide strong technical support for the safe and stable operation of large-scale power grids.

关键词： Artificial intelligence digital simulation power system analysis

A novel high voltage LIGBT with an n-region in p-substrate

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Journal of Semiconductors 2011年第11期32卷 51-54页

作者：成建兵张波李肇基 school of Electronic Science & engineering Nanjing University of Posts and Telecommunications State Key Laboratory of Electronic Thin Films and Integrated Devices University of Electronic Science and Technology of China

A novel 4 μm thickness drift region lateral insulated gate bipolar transistor with a floating n-region （NR- LIGBT） in p-substrate is proposed. Due to the field modulation from the n-region, the vertical blocking capability is enhanced and the breakdown voltage is improved significantly. Low area cost, high current capability and short turn-off time are achieved because of the high average electric field per micron. Simulation results show that the blocking capability of the new LIGBT increases by about 58% when compared with the conventional LIGBT （C-LIGBT） for the same 100 μm drift region length. Furthermore, the turn-off time is shorter than that of the conventional LIGBT for nearly same blocking capability.

关键词： NR-LIGBT blocking capability current capability turn-off time

A security scheme for intelligent substation communications considering real-time performance

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Journal of Modern Power Systems and Clean Energy 2019年第4期7卷 948-961页

作者： Jie ZHANG Jun’e LI Xiong CHEN Ming NI Ting WANG Jianbo LUO Key Laboratory of Aerospace Information Security and Trusted Computing Ministry of EducationSchool of Cyber Science and EngineeringWuhan UniversityWuhan 430072China NARI Group Corporation(State Grid electric Power Research Institute) Nanjing 211106China NARI Technology Co.Ltd. Nanjing 211106China State Key Laboratory of Smart Grid Protection and Control Nanjing 211106China

Tampering,forgery and theft of the measurement and control messages in a smart grid could cause one breakdown in the power ***,no security measures are employed for communications in intelligent *** services in an intelligent substation have high demands for real-time performance,which must be considered when deploying security *** paper studies the security requirements of communication services in intelligent substations,analyzes the security capabilities and shortages of IEC 62351,and proposes a novel security scheme for intelligent substation *** security scheme covers internal and telecontrol communications,in which the real-time performance of each security measure is *** this scheme,certificateless public key cryptography(CLPKC)is used to avoid the latency of certificate exchange in certificate-based cryptosystem and the problem of key escrow in identity-based cryptosystem;the security measures of generic object-oriented substation event,sampled measure value and manufacturing message specification in IEC 62351 are improved to meet the real-time requirements of the messages as well as to provide new security features to resist repudiation and replay attacks;and the security at transport layer is modified to fit CLPKC,which implements mutual authentication by exchanging ***,a deployment of CLPKC in an intelligent substation is *** also evaluate the security properties of the scheme and analyze the end-to-end delays of secured services by combining theoretical calculation and simulation in this *** results indicate that the proposed scheme meets the requirements of security and real-time performance of communications in intelligent substations.

关键词： Intelligent substation Security measures Certificateless public key cryptography(CLPKC) Real-time communication IEC 62351

A brief review on key technologies in the battery management system of electric vehicles

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Frontiers of mechanical engineering 2019年第1期14卷 47-64页

作者： Kailong LIU Kang LI Qiao PENG Cheng ZHANG school of Electronics Electrical Engineering and Computer ScienceQueen's University BelfastBT9 5AH BelfastUK school of Physics and Optoelectronic engineering Nanjing University of Information Science and TechnologyNanjing 210044China IDL Warwick Manufacturing GroupUniversity of WarwickCV4 7AL CoventryUK

Batteries have been widely applied in many high-power applications,such as electric vehicles(EVs)and hybrid electric vehicles,where a suitable battery management system(BMS)is vital in ensuring safe and reliable operation of *** paper aims to give a brief review on several key technologies of BMS,including battery modelling,state estimation and battery ***,popular battery types used in EVs are surveyed,followed by the introduction of key technologies used in *** battery models,including the electric model,thermal model and coupled electro-thermal model are ***,battery state estimations for the state of charge,state of health and internal temperature are comprehensively ***,several key and traditional battery charging approaches with associated optimization methods are discussed.

关键词： battery management system battery modelling battery state estimation battery charging

Abnormal Dielectric Response in an Optical Range Based on Electronic Transition in Rare-Earth-Ion-Doped Crystals

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Chinese Physics Letters 2012年第2期29卷 217-220页

作者：傅晓建许元达周济 State Key Laboratory of New Ceramics and Fine Processing Department of Materials Science and EngineeringTsinghua UniversityBeijing 100084 school of Physics Peking UniversityBeijing 100871

A new scheme to realize an abnormal dielectric response at optical wavelength is developed on the basis of twolevel electronic transition of rare-earth ion doped *** on the semi-classical theory and the Judd-Ofelt theory,the electric dipole transition under a weak field is analyzed,and a general expression for the frequencydependent dielectric constant is *** an example,the permittivity of (Erx Y1-x)3Al5O12 is calculated numerically in consideration of the transition between 4I15/2and 4F9/*** optimized dielectric property with a negative real part and low absorption is *** proposes a new mechanism for building extraordinary electromagnetic media at optical frequencies by using a quantum process.

关键词： process dielectric Transition

The dispersion relations for surface plasmon in a nonlinear-metal-nonlinear dielectric structure

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Chinese Physics B 2010年第9期19卷 543-547页

作者：刘炳灿于丽逯志欣张恺 school of Science Key Laboratory of Information Photonics and Optical CommunicationMinistry of EducationBeijing University of Posts and Telecommunications Department of Fundamental Courses Academy of Armored Force Engineering

In the asymmetric and symmetric nonlinear-metal-nonlinear dielectric structures, this paper studies the analytic dispersion relation for surface plasmon in a system consisting of a thin metallic film covered on two sides media of intensity-dependent refractive indexes by applying a generalised first integral approach. Especially in the symmetric waveguide structure, two possible modes can exist： the odd mode and the even mode. The dispersion relations of the two modes are obtained. Due to the nonlinear dielectric, the squared magnitude of the electric field at the interface appears and alters the dispersion relations. Numerical results are compared to those from a certain approximate treatment.

关键词： dispersion relation metal surface plasmon nonlinear

Feasibility Study of 60 GHz UWB System for Gigabit M2M Communications

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ZTE Communications 2017年第1期15卷 23-27页

作者： WANG Qi GENG Suiyan ZHAO Xiongwen HONG Wei Katsuyuki Haneda school of electrical and Electronic engineering North China Electric Power University State Key Laboratory of Millimeter Waves Southeast University Department of Radio Science engineering Aalto University

In this paper,the feasibility and performance of millimeter wave(mm Wave)60 GHz ultra-wide band(UWB)systems for gigabit machine-to-machine(M2M)communications are ***,based on specifications,channel measurements and models for both line-of-sight(LOS)and non-LOS(NLOS)scenarios,60 GHz propagation mechanisms are summarized,and 60 GHz UWB link budget and performance are *** are performed for determining ranges and antenna *** show that gigabit capacity can be achieved with omni-directional antennas configuration at the transceiver,especially in LOS *** the LOS path is blocked by a moving person or by radiowave propagation in the NLOS situation,omni-directional and directional antennas configuration at the transceiver is required,especially for a larger range between machines in office ***,it is essential to keep a clear LOS path in M2M applications like gigabit data *** goal of this work is to provide useful information for standardizations and design of 60 GHz UWB systems.

关键词： mmWave 60 GHz UWB M2M gigabit communications