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International Journal of Minerals,Metallurgy and Materials 2018年第11期25卷 1275-1285页

作者： Hai-tao Wang Zi-xiang Wang Lian-zheng Wang Jing-qin Wang Yan-cai Zhu state key laboratory of reliability and intelligence of electrical equipment School of Electrical EngineeringHebei University of Technology key laboratory of Electromagnetic Field and electrical Apparatus reliability of Hebei Province School of Electrical EngineeringHebei University of Technology

AgSnO_ 2 electrical contact materials doped with Bi_2O_3,La_2O_3,and TiO_2 were successfully fabricated by the powder metallurgy method under different initial sintering *** electrical conductivity,density,hardness,and contact resistance of the Ag Sn O_2/Bi_2O_3,AgSnO_2/La_2O_3,and AgSnO_2/Ti O_2 contact materials were measured and *** arc-eroded surface morphologies of the doped AgSnO_2 contact materials were investigated by scanning electron microscopy(SEM).The effects of the initial sintering temperature on the physical properties and electrical contact properties of the doped AgSnO_2 contact materials were *** results indicate that the physical properties can be improved and the contact resistance of the AgSnO_2 contact materials can be substantially reduced when the materials are sintered under their optimal initial sintering temperatures.

关键词： sintering temperature contact materials physical properties electrical contact properties

Shape-position perceptive fusion electronic skin with autonomous learning for gesture interaction

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Microsystems & Nanoengineering 2024年第4期10卷 225-238页

作者： Qian Wang Mingming Li Pingping Guo Liang Gao Ling Weng Wenmei Huang state key laboratory of reliability and intelligence of electrical equipment TianjinChina key laboratory of Electromagnetic Field and electrical Apparatus reliability of Hebei Province School of Electrical EngineeringHebei University of TechnologyTianjin 300130China

Wearable devices,such as data gloves and electronic skins,can perceive human instructions,behaviors and even emotions by tracking a hand's motion,with the help of knowledge *** shape or position single-mode sensor in such devices often lacks comprehensive information to perceive interactive ***,the limited computing power of wearable applications restricts the multimode fusion of different sensing data and the deployment of deep learning *** propose a perceptive fusion electronic skin(PFES)with a bioinspired hierarchical structure that utilizes the magnetization state of a magnetostrictive alloy film to be sensitive to external strain or magnetic *** at the joints of a hand,the PFES realizes perception of curvature(joint shape)and magnetism(joint position)information by mapping corresponding signals to the two-directional continuous distribution such that the two edges represent the contributions of curvature radius and magnetic field,*** autonomously selecting knowledge closer to the user's hand movement characteristics,the reinforced knowledge distillation method is developed to learn and compress a teacher model for rapid deployment on wearable *** PFES integrating the autonomous learning algorithm can fuse curvature-magnetism dual information,ultimately achieving human machine interaction with gesture recognition and haptic feedback for cross-space perception and manipulation.

关键词： alloy electronic interaction

Equation of state for aluminum in warm dense matter regime

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Chinese Physics B 2019年第1期28卷 511-517页

作者： Kun Wang Dong Zhang Zong-Qian Shi Yuan-Jie Shi Tian-Hao Wang Yue Zhang state key laboratory of reliability and intelligence of electrical equipment Hebei University of Technology key laboratory of Electromagnetic Field and electrical Apparatus reliability of Hebei Province Hebei University of Technology state key laboratory of electrical Insulation and Power equipment Xi’an Jiaotong University Institute of Electronic Engineering China Academy of Engineering Physics

A semi-empirical equation of state model for aluminum in a warm dense matter regime is constructed. The equation of state, which is subdivided into a cold term, thermal contributions of ions and electrons, covers a broad range of phase diagram from solid state to plasma state. The cold term and thermal contribution of ions are from the Bushman–Lomonosov model, in which several undetermined parameters are fitted based on equation of state theories and specific experimental data. The Thomas–Fermi–Kirzhnits model is employed to estimate the thermal contribution of electrons. Some practical modifications are introduced to the Thomas–Fermi–Kirzhnits model to improve the prediction of the equation of state model. Theoretical calculation of thermodynamic parameters, including phase diagram, curves of isothermal compression at ambient temperature, melting, and Hugoniot, are analyzed and compared with relevant experimental data and other theoretical evaluations.

关键词： equation of state phase diagram warm dense matter

Design Optimization of a Novel Axial-radial Flux Permanent Magnet Claw Pole Machine with SMC Cores and Ferrite Magnets

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CES Transactions on electrical Machines and Systems 2023年第4期7卷 358-365页

作者： Chengcheng Liu Fan Yang Wenfeng Zhang Youhua Wang state key laboratory of reliability and intelligence of electrical equipment School of Electrical EngineeringHebei University of TechnologyTianjin 300401China IEEE

Soft magnetic composite(SMC)material is an ideal soft magnetic material employed for developing 3D magnetic flux electromagnetic equipment,due to its advantages of 3D magnetic isotropy characteristic,low eddy current loss,and simple manufacturing *** permanent magnet claw pole machine(PMCPM)with SMC cores is a good case that the SMC to be adopted for developing 3D flux electrical *** this paper,a novel axial-radial flux permanent magnet claw pole machine(ARPMCPM)with SMC cores and ferrite magnets is *** with the traditional PMCPM,the proposed ARPMCPM is designed with only one spoke PM rotor and its whole structure is quite *** the performance prediction,the 3D finite element method(FEM)is ***,for the performance evaluation,a previously developed axial flux claw pole permanent magnet machine(AFCPM)is employed as the benchmark machine and all these machines are optimized by using the combined multilevel robust Taguchi *** can be seen that the proposed ARPMCPM is with higher torque/weight density and operation efficiency.

关键词： Soft magnetic composite(SMC) Permanent magnetic claw pole machine(PMCPM) Axial-radial flux

Design and Performance Analysis of Permanent Magnet Claw Pole Machine with Hybrid Cores

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CES Transactions on electrical Machines and Systems 2023年第3期7卷 275-283页

作者： Chengcheng Liu Zheng Chao Shaopeng Wang Youhua Wang IEEE state key laboratory of reliability and intelligence of electrical equipment Hebei University of Technology and Key Laboratory of Electromagnetic Field and Electrical Apparatus Reliability of Hebei ProvinceHebei University of TechnologyTianjin 300130China

Permanent magnet claw pole machine(PMCPM) is a special kind of transverse flux permanent magnet machine. Compared with other electrical machines, it has the advantages of high torque density and high efficiency for high speed operation. However, because of its complex irregular structure, the manufacturing process using silicon sheets is complicated. Soft magnetic composite material(SMC) is manufactured by powder metallurgy technology, which can produce various shapes of stator core structures, so it is easier to produce various irregular shapes of the stator core. However, the raw SMC material is relatively expensive, and the mechanical strength of SMC is weak. In this paper, a PMCPM with hybrid cores is proposed. With the adoption of hybrid silicon sheet-SMC cores and amorphous alloy-SMC cores, the torque ability of PMCPM can be improved greatly and it can have higher efficiency for more wide operation frequency. Meanwhile, its mechanical strength has been improved and it can be designed for high torque direct drive applications as it is a modular machine. Furthermore, three methods are proposed to reduce the additional eddy current loss which resulted from the employment of hybrid cores in PMCPM.

关键词： Permanent magnet claw pole machine(PMCPM) Soft magnetic materials(SMC) Hybrid cores Eddy current loss

Measured Impedance and Threshold Value of Electrode Line Impedance Supervision Based Protection in HVDC Transmission System

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Journal of Modern Power Systems and Clean Energy 2023年第4期11卷 1294-1304页

作者： Qiang Sun Bin Li Jiawei He Ye Li key laboratory of Smart Grid of Ministry of Education Tianjin UniversityTianjinChina state key laboratory of reliability and intelligence of electrical equipment Hebei University of TechnologyTianjinChina

At present,electrode line impedance supervision(ELIS)based protection is widely used to detect faults on grounding electrode lines,which are indispensable elements of high-voltage direct current(HVDC)*** existing theoretical analysis of measured impedance is based on lumped line model and the threshold value is generally set according to engineering experience,which have caused the dead zone problem and even ***,a study on measured impedance of ELIS-based protection and its threshold value selection method is carried out to solve this *** this study,the expressions of measured impedance under normal operation and fault conditions are deduced based on rigorous and accurate line *** on the expressions,the characteristics of the measured impedance are calculated and *** the characteristics of the measured impedance,the applicability of the protection with the traditional threshold value is further discussed and the distribution of the dead zone can be ***,the method to calculate the threshold value of ELIS-based protection is *** a proper threshold value selected by the proposed method,the dead zone of ELIS-based protection is effectively eliminated,and the protection can identify all types of faults even with large transition *** studies on PSCAD/EMTDC have been conducted to verify the conclusion.

关键词： Grounding electrode line electrode line impedance supervision(ELIS)based protection measured impedance characteristic threshold value selection

Molecular pyrolysis process and gas production characteristics of 3-element mixed insulation oil under thermal fault

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High Voltage 2022年第6期7卷 1130-1140页

作者： Dawei Feng Ge Chen Xiaoyu Yan Jian Hao Ruijin Liao state key Lab of reliability and intelligence of electrical equipment School of Electrical EngineeringHebei University of TechnologyTianjinChina Hebei International Joint Research Center for reliability and intelligence of Modern electrical equipment TianjinChina state key laboratory of Power Transmission equipment&System Security and New Technology School of Electrical EngineeringChongqing UniversityChongqingChina

Mixed insulation oil is considered as a desired substitute for traditional mineral oil.A novel 3-element mixed insulation oil has been developed in our previous works,whose parameters satisfy the mineral oil standard(IEC 60296:2012).In the application of transformer oil,dissolved gas analysis is an effective method for insulation fault *** fault is a common and typical fault in transformers;however,the pyrolysis process and gas production characteristics of mixed insulation oil under thermal fault remain *** this study,the pyrolysis process and gas production characteristics of 3-element mixed insulation oil have been studied through simulation and experiments,and mineral oil is equally treated for *** show that the gas production characteristics of mixed oil are closely related to its base oils,and 3-element mixed insulation oil generates more H_(2)and C_(2)H_(6)under thermal fault,in which the percentage of H_(2)in the mixed oil is always three times that in the mineral *** CO_(2)is produced in mixed oil under thermal fault because of ester bonds;C_(2)H_(4)is also a main characteristic gas for mixed insulation oil under thermal fault,and its proportion increases continuously with the increase of *** mineral oil,the weight loss temperature in thermogravimetric(TG)curve corresponds to evaporation rather than *** esters have poor thermal stability according to simulation results,but they possess high flash point and weight loss temperature in the TG curve primarily because of their large average molecular weight.

关键词： insulation fault pyrolysis

Rational design of superior catalysts from topological semimetals with nontrivial energy window

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Rare Metals 2024年第5期43卷 1956-1964页

作者： Min Zhao Li-Rong Wang Wei Liu Ming-Hang Li Ying Liu Xue-Fang Dai Guo-Dong Liu Xiao-Ming Zhang key laboratory of reliability and intelligence of electrical equipment School of Materials Science and Engineering ManufacturingHebei University of TechnologyTianjin 300130China

Materials featuring topological energy bands and nontrivial surface states hold significant promise in unlocking unprecedented opportunities for innovating electrocatalytic ***,it remains a challenge to realize superior topological catalysts which can carry both high catalytic activity and excellent catalytic ***,we propose that a family of Ni-based binary materials hosting fantasying topological conjunct-nodalpoint state and a large nontrivial energy window(NEWD)represents an ideal choice for such superior topological catalysts in hydrogen evolution *** presence of conjunct-nodal-points ensures long Fermi arcs on the surface,thereby enabling an extremely high catalytic *** NEWD plays a crucial role in stabilizing the high catalytic activity against external perturbations,such as strain and electron/hole *** roles for conjunctnodal-points and NEWD are substantiated by the observable weakening of catalytic performance during topological phase transitions,which result in the removal of the conjunct-nodal-points,NEWD and their corresponding long Fermi *** work unveils a hidden mechanism and opens a feasible route for developing superior quantum catalysts from novel topology point of view.

关键词： First-principles modeling Topological semimetal Nontrivial surface states Hydrogen evolution reaction

Effect of astrocyte on synchronization of thermosensitive neuron–astrocyte minimum system

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Chinese Physics B 2022年第8期31卷 325-336页

作者： Yi-Xuan Shan Hui-Lan Yang Hong-Bin Wang Shuai Zhang Ying Li Gui-Zhi Xu state key laboratory of reliability and intelligence of electrical equipment Hebei University of TechnologyTianjin 300130China Hebei key laboratory of Bioelectromagnetics and Neural Engineering Hebei University of TechnologyTianjin 300130China

Astrocytes have a regulatory function on the central nervous system(CNS), especially in the temperature-sensitive hippocampal region. In order to explore the thermosensitive dynamic mechanism of astrocytes in the CNS, we establish a neuron-astrocyte minimum system to analyze the synchronization change characteristics based on the Hodgkin-Huxley model, in which a pyramidal cell and an interneuron are connected by an astrocyte. The temperature range is set as 0-40 ℃ to juggle between theoretical calculation and the reality of a brain environment. It is shown that the synchronization of thermosensitive neurons exhibits nonlinear behavior with changes in astrocyte parameters. At a temperature range of0 ℃-18 ℃, the effects of the astrocyte can provide a tremendous influence on neurons in synchronization. We find the existence of a value for inositol triphosphate(IP_(3)) production rate and feedback intensities of astrocytes to neurons, which can ensure the weak synchronization of two neurons. In addition, it is revealed that the regulation of astrocytes to pyramidal cells is more sensitive than that to interneurons. Finally, it is shown that the synchronization and phase transition of neurons depend on the change in Ca^(2+) concentration at the temperature of weak synchronization. The results in this paper provide some enlightenment on the mechanism of cognitive dysfunction and neurological disorders with astrocytes.

关键词： astrocytes synchronization Hodgkin–Huxley model thermosensitive neuron

Oscillation of S5 helix under different temperatures in determination of the open probability of TRPV1 channel

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Chinese Physics B 2020年第9期29卷 574-580页

作者： Tie Li Jun-Wei Li Chun-Li Pang Hailong An Yi-Zhao Geng Jing-Qin Wang state key laboratory of reliability and intelligence of electrical equipment Hebei University of TechnologyTianjin 300130China Institute of Biophysics Hebei University of TechnologyTianjin 300401China

Transient receptor potential vanilloid subtype 1 (TRPV1) is a polymodel sensory receptor and can be activated by moderate temperature (≥ 43 ℃). Though extensive researches on the heat-activation mechanism revealed some key elements that participate in the heat-sensation pathway, the detailed thermal-gating mechanism of TRPV1 is still unclear. We investigate the heat-activation process of TRPV1 channel using the molecular dynamics simulation method at different temperatures. It is found that the favored state of the supposed upper gate of TRPV1 cannot form constriction to ion permeation. Oscillation of S5 helix originated from thermal fluctuation and forming/breaking of two key hydrogen bonds can transmit to S6 helix through the hydrophobic contact between S5 and S6 helix. We propose that this is the pathway from heat sensor of TRPV1 to the opening of the lower gate. The heat-activation mechanism of TRPV1 presented in this work can help further functional study of TRPV1 channel.

关键词： TRPV1 heat-activation mechanism molecular dynamics simulation hydrogen bond gating