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< Page ,Total 42 >
Photoelectron Emission Yield of Au Film: Theoretical Calculation and Measurement EI SCIE
期刊论文 | 2021 , 70 | IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
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Abstract :

Spacecraft in orbit are exposed to intense solar radiation in the space environment, causing the material surface to be charged and damaged. The incident electrons, ions, and photons on the surface of spacecraft materials produce secondary electrons, backscattered electrons, photoelectrons, and so on. The damage to the material caused by the emitted photocurrent is more serious when the incident energy is higher than the photoelectric threshold. In view of the significant threat of particle radiation to the charge protection and operational life of spacecraft materials, in this article, a theoretical model of the photoelectron emission yield (PEEY) is studied, and a test system of metal materials under ultraviolet light is developed. First, we derive a three-step model of the photoemission of metal materials and calculate the PEEY spectrum of Au. Second, the optical system is built by using a deuterium lamp, a monochromator, and an aperture. The installation structure of the photodiode is designed, and the photon number is obtained by measuring the incident luminous flux. Third, a central through-hole microchannel plate is used and a voltage division circuit module is designed to realize effective collection of photoelectrons emitted from the sample surface. This approach realizes a detectable range for an Au film from 10(-4) to 10(-7) el./ph in the spectral range of 130-258 nm. The reliability of the test system is proved by comparing the experimental results with the theoretical results.

Keyword :

photoelectron emission yield (PEEY) spacecraft charging ultraviolet light photoelectron Au film

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GB/T 7714 Chen, Yu , Yang, Yan , Li, Hanzhi et al. Photoelectron Emission Yield of Au Film: Theoretical Calculation and Measurement [J]. | IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT , 2021 , 70 .
MLA Chen, Yu et al. "Photoelectron Emission Yield of Au Film: Theoretical Calculation and Measurement" . | IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT 70 (2021) .
APA Chen, Yu , Yang, Yan , Li, Hanzhi , Li, Changxi , Huang, Guorui , Zhao, Shouwang et al. Photoelectron Emission Yield of Au Film: Theoretical Calculation and Measurement . | IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT , 2021 , 70 .
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Numerical Modeling, Electrical Characteristics Analysis and Experimental Validation of Severe Inter-Turn Short Circuit Fault Conditions on Stator Winding in DFIG of Wind Turbines EI SCIE
期刊论文 | 2021 , 9 , 13149-13158 | IEEE Access
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Abstract :

Inter-turn short circuit fault (ITSCF) can be a great threat for the safety and effectiveness of the generator. In this paper, a simulation model with the experimental platform is established to diagnose the ITSCF in stator windings. A simulation model based on the Finite Element Method (FEM) is designed in ANSYS. Stator current is used for calculating the Root-Mean-Square (RMS) value, phase difference, symmetrical components, Park's vector trajectory's and Total Harmonic Distortion (THD). It was found that when ITSCF happened, three phase currents in stator is no longer symmetrical. The ratio of negative to positive sequence of current raises from 0.40 to 14.18 in simulation and 0.52 to 19.89 in the experiment from normal condition to 7 turns shorted. The same trend was seen in Park's vector trajectory analysis where the eccentricity raises from 0.03 to 0.65 in simulation and 0.14 to 0.75 in the experiment. Phase difference of the three phases is at 120° degree deviation as the ITSCF occurs in stator winding. THD also increased with the increase in the fault level. The results show a good consistency of simulation with experimental results. It was found that the analysis performed in this research are major indications for serious fault in DFIG. © 2013 IEEE.

Keyword :

Electric machine theory Asynchronous generators Wind turbines Stators Winding Timing circuits

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GB/T 7714 Chen, Yu , Rehman, Attiq Ur , Zhao, Yihan et al. Numerical Modeling, Electrical Characteristics Analysis and Experimental Validation of Severe Inter-Turn Short Circuit Fault Conditions on Stator Winding in DFIG of Wind Turbines [J]. | IEEE Access , 2021 , 9 : 13149-13158 .
MLA Chen, Yu et al. "Numerical Modeling, Electrical Characteristics Analysis and Experimental Validation of Severe Inter-Turn Short Circuit Fault Conditions on Stator Winding in DFIG of Wind Turbines" . | IEEE Access 9 (2021) : 13149-13158 .
APA Chen, Yu , Rehman, Attiq Ur , Zhao, Yihan , Wang, Lulu , Wang, Shuang , Zhang, Min et al. Numerical Modeling, Electrical Characteristics Analysis and Experimental Validation of Severe Inter-Turn Short Circuit Fault Conditions on Stator Winding in DFIG of Wind Turbines . | IEEE Access , 2021 , 9 , 13149-13158 .
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Insulating Silicones Based on Dynamic Hindered Urea Bonds with High Dielectric Healability and Recyclability EI SCIE
期刊论文 | 2021 , 3 (11) , 5622-5631 | ACS APPLIED POLYMER MATERIALS
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Abstract :

Silicone-containing dynamically hindered urea bonds are developed as a smart insulating material for power equipment and electronic devices. In this work, silicones are constructed by isocyanate-piperazine-based dynamic bonds with cross-linking degree adjusted by glycerol. Healing and recycling based on dielectric and insulating properties are mainly emphasized in this study. We find that dynamic bonds not only heal the cut-damaged feature of the silicone but also enable dielectric property recovery. A healing efficiency above 95% and a recycling efficiency above 90% based on insulation performance are achieved. After recycling, cross-linked silicone exhibits only a slight variation in permittivity and tan delta, while linear silicone shows an apparent increase. Insulation performance of materials with different cross-linking agent concentrations is also investigated. A higher cross-linking degree was found to further improve insulation properties but reduces the recycling efficiency. Importantly, the developed silicones exhibit high intrinsic insulation commercial silicone materials, which are very attractive for electrical applications.

Keyword :

healability dynamic chemical bonds Silicone dielectric performance recyclability

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GB/T 7714 Sun, Wenjie , Luo, Jiaming , Zhang, Lei et al. Insulating Silicones Based on Dynamic Hindered Urea Bonds with High Dielectric Healability and Recyclability [J]. | ACS APPLIED POLYMER MATERIALS , 2021 , 3 (11) : 5622-5631 .
MLA Sun, Wenjie et al. "Insulating Silicones Based on Dynamic Hindered Urea Bonds with High Dielectric Healability and Recyclability" . | ACS APPLIED POLYMER MATERIALS 3 . 11 (2021) : 5622-5631 .
APA Sun, Wenjie , Luo, Jiaming , Zhang, Lei , Chen, Yue , Li, Pengxin , Zheng, Yiting et al. Insulating Silicones Based on Dynamic Hindered Urea Bonds with High Dielectric Healability and Recyclability . | ACS APPLIED POLYMER MATERIALS , 2021 , 3 (11) , 5622-5631 .
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Nanotip Shape Evolution Under High Electric Fields Based on Molecular Dynamics EI
会议论文 | 2021 , 742 LNEE , 795-803 | 9th Frontier Academic Forum of Electrical Engineering, FAFEE 2020
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Abstract :

The insulation of micro/nano electronic devices under high electric fields determines the life and reliability of electronic components. Research on vacuum discharge in nanoscale and subsequent thermal damage effect of electrode materials during the breakdown process still lacks of systematic research. In this work, tip morphological evolution and crystal shape changes caused by thermal-field emission and field evaporation in high electric fields is studied. The whole tip morphological dynamic evolution process under electric field is modeled and calculated by a recently developed model FEMOCS which couples finite element method (FEM) with classical molecular dynamics (MD). Monocrystalline cooper nanotips was modeled with the applied electric field which was about the critical electric field of nanoscale pre-breakdown. At lower electric fields, the results showed that shape memory effect (SME) occurred when the tip temperature exceed its critical temperature, and it resulted in a larger radius and shorter tip length, which caused the electric field to be smaller than the initial electric field, and eventually the breakdown would not occur. And when the electric field is greater than the critical electric field, the breakdown occurred quickly and with a large amount of atomic evaporation. The results showed that the critical electric field not only determines whether the breakdown will occur, but also influences the tip morphological evolution in different ways and whether atomic evaporation takes place. © 2021, Beijing Oriental Sun Cult. Comm. CO Ltd.

Keyword :

Molecular dynamics Electric discharges Vacuum applications Electric insulation Evaporation Nanotips

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GB/T 7714 Gao, Xinyu , Xiao, Bing , Li, Nan et al. Nanotip Shape Evolution Under High Electric Fields Based on Molecular Dynamics [C] . 2021 : 795-803 .
MLA Gao, Xinyu et al. "Nanotip Shape Evolution Under High Electric Fields Based on Molecular Dynamics" . (2021) : 795-803 .
APA Gao, Xinyu , Xiao, Bing , Li, Nan , Jing, Ziang , Dong, Chengye , Meng, Guodong et al. Nanotip Shape Evolution Under High Electric Fields Based on Molecular Dynamics . (2021) : 795-803 .
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Attenuation investigation influenced by the temperature and strain in an optical fiber composite low voltage cable EI SCIE
期刊论文 | 2021 , 29 (8) , 12696-12711 | OPTICS EXPRESS
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Abstract :

Optical fiber composite low voltage cable (OPLC) is an optimal way of connecting the smart grid with the load. In this paper, the field distribution of temperature and stress is simulated by applying the finite element method. At the overload condition, the fiber unit's temperature rises to 59 degrees C that generates the strain of 387 mu epsilon. This strain and temperature together result in the additional attenuation of 0.053 dB/km in the optical fiber. Temperature and strain are termed as the major contributing factors towards the attenuation in the optical fiber as temperature caused 16.03% while strain caused 80.56% of the total loss. (C) 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

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GB/T 7714 Ashfaq, Ahsan , Chen, Yu , Jia, Feng et al. Attenuation investigation influenced by the temperature and strain in an optical fiber composite low voltage cable [J]. | OPTICS EXPRESS , 2021 , 29 (8) : 12696-12711 .
MLA Ashfaq, Ahsan et al. "Attenuation investigation influenced by the temperature and strain in an optical fiber composite low voltage cable" . | OPTICS EXPRESS 29 . 8 (2021) : 12696-12711 .
APA Ashfaq, Ahsan , Chen, Yu , Jia, Feng , Yao, Kai , Yu, Jing , Cheng, Yonghong . Attenuation investigation influenced by the temperature and strain in an optical fiber composite low voltage cable . | OPTICS EXPRESS , 2021 , 29 (8) , 12696-12711 .
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Mechanically enhanced healable and recyclable silicone with dynamic hindered urea bond for flexible electronics SCIE
期刊论文 | 2021 , 9 (27) , 8579-8588 | JOURNAL OF MATERIALS CHEMISTRY C
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Abstract :

A silicone-containing dynamic hindered urea bond is demonstrated in this study for application in flexible electronics. Generated from isocyanate and piperazine, these dynamic hindered urea bonds endow silicone with high healing and recycling ability under mild conditions, together with an enhancement of more than 50% in tensile strength. By adjusting the piperazine and glycerol amount, the influences of the dynamic bond concentration and crosslinking density were also investigated. It was found that a higher piperazine amount improves the healing ability and recyclability, while increasing the glycerol fraction can enhance the tensile strength and elongation, but deteriorates the healing and recycling. Flexible conductive materials were prepared by filling the developed silicone with graphene. Admirable flexibility, healing ability and a sensitive response to resistance changes were prototyped by a flexible circuit with the light signal.

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GB/T 7714 Sun, Wenjie , Zhang, Lei , Wang, Shuang et al. Mechanically enhanced healable and recyclable silicone with dynamic hindered urea bond for flexible electronics [J]. | JOURNAL OF MATERIALS CHEMISTRY C , 2021 , 9 (27) : 8579-8588 .
MLA Sun, Wenjie et al. "Mechanically enhanced healable and recyclable silicone with dynamic hindered urea bond for flexible electronics" . | JOURNAL OF MATERIALS CHEMISTRY C 9 . 27 (2021) : 8579-8588 .
APA Sun, Wenjie , Zhang, Lei , Wang, Shuang , Mao, Jiale , Luo, Jiaming , Chen, Yu et al. Mechanically enhanced healable and recyclable silicone with dynamic hindered urea bond for flexible electronics . | JOURNAL OF MATERIALS CHEMISTRY C , 2021 , 9 (27) , 8579-8588 .
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Research Progress of All Organic Polymer Dielectrics for Energy Storage from the Classification of Organic Structures EI SCIE
期刊论文 | 2021 , 222 (11) | MACROMOLECULAR CHEMISTRY AND PHYSICS
WoS CC Cited Count: 1
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Abstract :

Dielectric films are the foundation of power electronic equipment for energy storage in capacitors. However, typical dielectric films exhibit undesirable energy storage density and thermal stability, limiting its further application in the advanced field. For both pure polymers and composites-based dielectrics, the macromolecular matrix greatly determines the performances. This paper summarizes the research progress of all-organic polymer materials for the dielectric application from the perspective of molecular structure design. Systematic comparisons on properties, including dielectric constant and dielectric loss, glass transition temperature, and energy density are given, expecting to inspire researchers to devote further efforts in this area. An outlook for the future of all-polymer dielectrics is also presented.

Keyword :

all organic polymer dielectrics molecular structure design dielectric loss dielectric constant high energy storage density

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GB/T 7714 Luo, Jiaming , Mao, Jiale , Sun, Wenjie et al. Research Progress of All Organic Polymer Dielectrics for Energy Storage from the Classification of Organic Structures [J]. | MACROMOLECULAR CHEMISTRY AND PHYSICS , 2021 , 222 (11) .
MLA Luo, Jiaming et al. "Research Progress of All Organic Polymer Dielectrics for Energy Storage from the Classification of Organic Structures" . | MACROMOLECULAR CHEMISTRY AND PHYSICS 222 . 11 (2021) .
APA Luo, Jiaming , Mao, Jiale , Sun, Wenjie , Wang, Shuang , Zhang, Lei , Tian, Liliang et al. Research Progress of All Organic Polymer Dielectrics for Energy Storage from the Classification of Organic Structures . | MACROMOLECULAR CHEMISTRY AND PHYSICS , 2021 , 222 (11) .
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Development of a Measurement System for the Secondary Electron Emission Yield Spectrum of Space Materials EI Scopus
会议论文 | 2020 , 160-163 | 1st International Conference on Sensing, Measurement and Data Analytics in the Era of Artificial Intelligence, ICSMD 2020
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Abstract :

When a spacecraft is operating in space orbit, the phenomenon of secondary electron emission will occur under the influence of charged particles in space, causing the surface of the spacecraft to charge, and long-term accumulation will cause damage to the spacecraft and its instruments. In response to the needs of spacecraft live protection and life evaluation, this paper has researched the secondary electron emission yield spectrum test technology of space materials and completed the development of the test system. Firstly, we use an electron gun with an energy range of 0-2000eV, a beam current of 1nA-10µA, and a minimum beam spot diameter of 0.5mm to achieve stable electron beam current in the secondary electron emission coefficient measurement system in this paper. Secondly, the vacuum system uses mechanical pumps, molecular pumps, and sputtering ion pump, so that it can reach a vacuum of 1×10-6pa. Thirdly, the measurement scheme of vacuum secondary electron collecting ball and grid structure is proposed for the first time, which can realize the distinguished collection and measurement of true secondary electrons and backscattered secondary electrons. Finally, the measurement of the secondary electron yield spectrum of metal materials was studied, and the efficient measurement of the secondary electron emission yield spectrum of oxygen-free copper and gold materials was completed. The test results have reached that the secondary electron emission yield spectrum data of Cu and Au samples under 0-2000eV incident electrons is consistent with the literature, which verifies the reliability of the test system. © 2020 IEEE.

Keyword :

Artificial intelligence Pumps Spacecraft Secondary emission Electrons Orbits Electron guns

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GB/T 7714 Chen, Yu , Huang, Guorui , Yang, Yan et al. Development of a Measurement System for the Secondary Electron Emission Yield Spectrum of Space Materials [C] . 2020 : 160-163 .
MLA Chen, Yu et al. "Development of a Measurement System for the Secondary Electron Emission Yield Spectrum of Space Materials" . (2020) : 160-163 .
APA Chen, Yu , Huang, Guorui , Yang, Yan , Shi, Qingyun , Chen, Zecai , Wang, Shuang et al. Development of a Measurement System for the Secondary Electron Emission Yield Spectrum of Space Materials . (2020) : 160-163 .
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Analysis of the Charge Transport in LDPE with Combined Measurement of Space Charge and Current EI
会议论文 | 2020 , 367-370 | 3rd IEEE International Conference on Dielectrics, ICD 2020
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Space charge accumulation is an important issue for HVDC cable design. The space charge accumulation are determined by the charge transport property which can be monitored by the space charge and conduction current measurement. In this paper, based on PEA system and three-electrode system, the modified combined measurement system was developed to measure the space charge and current in LDPE samples simultaneously. The results show that the current gradually decreased with the accumulation of homocharges; the generation and movement of space charge packet resulted in the current peaks; the reduction of homocharge accumulation and the increase of heterocharge tends to increase the current. © 2020 IEEE.

Keyword :

Carrier transport Electric space charge Electric field effects

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GB/T 7714 Lv, Zepeng , Zhang, Chen , Ma, Yuntong et al. Analysis of the Charge Transport in LDPE with Combined Measurement of Space Charge and Current [C] . 2020 : 367-370 .
MLA Lv, Zepeng et al. "Analysis of the Charge Transport in LDPE with Combined Measurement of Space Charge and Current" . (2020) : 367-370 .
APA Lv, Zepeng , Zhang, Chen , Ma, Yuntong , Wu, Kai , Cheng, Yonghong . Analysis of the Charge Transport in LDPE with Combined Measurement of Space Charge and Current . (2020) : 367-370 .
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Stator Inter-turns Short Circuit Fault Detection in DFIG Using Empirical Mode Decomposition Method on Leakage Flux EI Scopus
会议论文 | 2020 , 184-187 | 1st International Conference on Sensing, Measurement and Data Analytics in the Era of Artificial Intelligence, ICSMD 2020
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Inter-turn short-circuit fault (ITSCF) in doubly fed induction generator (DFIG) effect the performance of the wind turbine, so the surveillance of DFIGs is of very importance for the safe operation of the wind turbine. To solve this issue, an experimental setup was constructed for the detection of stator ITSCF. This experimental setup consist of three-phase wound rotor induction machine (WRIM), monitoring systems, frequency converters and related control and a drive motors. This experimental system can truly simulate the actual working conditions of the machine when the machine is short-circuited, and the experimental simulation can be closer to the operation process of the double-fed induction generator. Flux monitoring method was used to detect the ITSCF in stator windings. Time domain analysis was used on flux signal to detect the ITSCF at its initial stage of the fault. Empirical Mode Decomposition (EMD) method was applied on flux to detect the stator ITSCF. The EMD of the flux signal in the stator winding ITSCF yields 9 layers of empirical modal components IMFs. The IMF5 and IMF6, was found useful to discriminate the normal and faulty condition of the machine. The results show that EMD analysis on flux monitoring is advance and effective way than the other methods to detect the ITSCF in stator windings. © 2020 IEEE.

Keyword :

Artificial intelligence Asynchronous generators Time domain analysis Signal processing Stators Electric generators Wind turbines Timing circuits Winding Monitoring Fault detection Digital storage Electric fault currents

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GB/T 7714 Ur Rehman, Attiq , Chen, Yu , Huang, Guorui et al. Stator Inter-turns Short Circuit Fault Detection in DFIG Using Empirical Mode Decomposition Method on Leakage Flux [C] . 2020 : 184-187 .
MLA Ur Rehman, Attiq et al. "Stator Inter-turns Short Circuit Fault Detection in DFIG Using Empirical Mode Decomposition Method on Leakage Flux" . (2020) : 184-187 .
APA Ur Rehman, Attiq , Chen, Yu , Huang, Guorui , Yang, Yan , Wang, Shuang , Zhao, Yihan et al. Stator Inter-turns Short Circuit Fault Detection in DFIG Using Empirical Mode Decomposition Method on Leakage Flux . (2020) : 184-187 .
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