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学者姓名：贾申利
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Abstract ：
The phenomenon of cathode spot (CS) retrograde motion has been attracting extensive research in the field of vacuum arc. Although a number of theoretical models have been proposed to explain this phenomenon, up to now, the first-principle understanding is still missing. In this work, based on the generalized Ohm's law, it is proposed that there is a transport current in the explosive emission center when a transverse magnetic field (TMF) is applied. The investigation of the influence of the transport current on the strength of the electric field in the cathode sheath suggests that the transport current affects the ignition of new CS in the retrograde direction. In the framework of the ecton model, combined with the dynamics of explosive emission plasma, the relationship between the strength of applied TMF and the ignition probability of new CS in different directions is established, and the retrograde motion characteristics of CS are simulated using a statistical model. The simulation results show that the directionality of retrograde motion of CS is enhanced with an increase in TMF, and the retrograde motion speed of CS increases with the increase of the applied TMF. When the strength of TMF is small, the motion speed of a single CS has a linear relationship with the strength of TMF, but with the increase of the strength of TMF, the motion speed of a single CS is gradually saturated, which is consistent with experimental facts. The feasibility of the model is verified by comparing the simulation results with relevant experimental results.
Keyword ：
Cathodes Cathode spot (CS) Ions Perpendicular magnetic anisotropy Plasmas retrograde motion Saturation magnetization Simulation transverse magnetic field (TMF) Vacuum arcs
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| GB/T 7714 | Xu, Pengfei , Shi, Zongqian , Guo, Jing et al. Theoretical Model of the Retrograde Motion of Cathode Spots of Vacuum Arc [J]. | IEEE TRANSACTIONS ON PLASMA SCIENCE , 2022 , 50 (10) : 3742-3750 . |
| MLA | Xu, Pengfei et al. "Theoretical Model of the Retrograde Motion of Cathode Spots of Vacuum Arc" . | IEEE TRANSACTIONS ON PLASMA SCIENCE 50 . 10 (2022) : 3742-3750 . |
| APA | Xu, Pengfei , Shi, Zongqian , Guo, Jing , Zhu, Qijie , Mo, Yongpeng , Sun, Jiajia et al. Theoretical Model of the Retrograde Motion of Cathode Spots of Vacuum Arc . | IEEE TRANSACTIONS ON PLASMA SCIENCE , 2022 , 50 (10) , 3742-3750 . |
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Abstract ：
In the DC grid, fault current rises very fast due to low impedance. Fast DC circuit breakers are needed to isolate faults and avoid a collapse of the common DC grid voltage. Based on the forced current zero (CZ) technology, the vacuum interrupter (VI) equipped with fast electromagnetic repulsion mechanism is a very promising solution of fast DC interruption. The experimental research on the DC interruption characteristics of a VI, namely by examining the post-arc current (PAC) is presented in this paper. The dependence of the interruption capability on the PAC is analysed. What's more, the failure modes of the VI under various experiment conditions are summarized. A former finding was that not all the arcing history which starts from the electrodes separating to the CZ has influence on the PAC but only a very short duration of several microseconds right before the CZ takes effects. New experiment results are added in this paper to support the former finding. Another former finding was that a longer electrode separation will bring about higher PAC. In this paper, both the influence of the arcing memory time and the electrodes separation are owed to a higher residual plasma density, which is verified by a model for calculating the residual plasma density and the continuous transient model (CTM) for calculating PAC.
Keyword ：
DC circuit breaker forced current zero post-arc current vacuum interrupter
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| GB/T 7714 | Tang, Qiang , Jia, Shenli , Shi, Zongqian et al. Post-arc current measurement and interruption performance of vacuum interrupter in DC interruption [J]. | JOURNAL OF PHYSICS D-APPLIED PHYSICS , 2022 , 55 (14) . |
| MLA | Tang, Qiang et al. "Post-arc current measurement and interruption performance of vacuum interrupter in DC interruption" . | JOURNAL OF PHYSICS D-APPLIED PHYSICS 55 . 14 (2022) . |
| APA | Tang, Qiang , Jia, Shenli , Shi, Zongqian , Mo, Yongpeng . Post-arc current measurement and interruption performance of vacuum interrupter in DC interruption . | JOURNAL OF PHYSICS D-APPLIED PHYSICS , 2022 , 55 (14) . |
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Abstract ：
A contribution to the engineering application of a proposed 500-kV fault current limiter (FCL) is presented. A new type of FCL composed of a highly coupled split reactor (HCSR) and fast switches is proposed. When the circuit breaker (CB) in series with the FCL in the 500-kV power system interrupts the limited fault current, the rate of rise of the recovery voltage (RRRV) reaches a value much higher than the rated value. Based on a simplified equivalent single-phase circuit, the influence of the new FCL on the interruption procedure of the CB is simulated and discussed. The simulation results show that the high RRRV is caused by high-frequency resonant oscillations between the HCSR and its parasite capacitance. Analysis indicates that when the reactance of the FCL is close to the short circuit reactance of the system, the RRRV will reach the highest value. To solve this issue, we proposed installing a shunt capacitor with the FCL. Simulation results showed that the RRRV under all fault modes could be restrained to below the rated value by introducing a certain shunt capacitor.
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| GB/T 7714 | Tang, Qiang , Jia, Shenli , Zhang, Yanzhe et al. Analysis of influence of a novel inductive fault current limiter on the circuit breaker in 500-kV power system [J]. | HIGH VOLTAGE , 2021 , 6 (6) : 997-1008 . |
| MLA | Tang, Qiang et al. "Analysis of influence of a novel inductive fault current limiter on the circuit breaker in 500-kV power system" . | HIGH VOLTAGE 6 . 6 (2021) : 997-1008 . |
| APA | Tang, Qiang , Jia, Shenli , Zhang, Yanzhe , Xiu, Shixin , Mo, Wenxiong , Wang, Yong et al. Analysis of influence of a novel inductive fault current limiter on the circuit breaker in 500-kV power system . | HIGH VOLTAGE , 2021 , 6 (6) , 997-1008 . |
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Abstract ：
The splitting and threshold currents of vacuum arc cathode spots in axial magnetic fields (AMFs) up to 220 mT are investigated experimentally. Measurements are made on electrodes of Cu and CuCr25 with electrode separations of 2 and 6 mm. The electrode diameter is 30 mm. All the experiments are conducted in a demountable vacuum chamber evacuated continuously by a turbo-molecular pump to a pressure of the order of 10(-3) Pa. The spots are photographed using a high-speed digital camera with an exposure time of 2 mu s. The AMF is applied by means of two permanent magnets placed symmetrically inside the chamber. The experimental results indicate that the splitting and threshold current decrease in the presence of AMF and tend to certain constant values when the field gets stronger. The splitting and threshold currents are considerably larger than Cu electrodes than those with CuCr25 electrodes. With increasing electrode separation, the splitting current decreases while the threshold current increases. Possible explanations are proposed to account for the experimental observations.
Keyword ：
Axial magnetic field (AMF) cathode spot splitting current threshold current vacuum arc
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| GB/T 7714 | Shi, Zongqian , Xu, Pengfei , Zhu, Qijie et al. Experimental Investigation on the Current Carried by a Cathode Spot of Vacuum Arc in Axial Magnetic Fields [J]. | IEEE TRANSACTIONS ON PLASMA SCIENCE , 2021 , 49 (5) : 1648-1653 . |
| MLA | Shi, Zongqian et al. "Experimental Investigation on the Current Carried by a Cathode Spot of Vacuum Arc in Axial Magnetic Fields" . | IEEE TRANSACTIONS ON PLASMA SCIENCE 49 . 5 (2021) : 1648-1653 . |
| APA | Shi, Zongqian , Xu, Pengfei , Zhu, Qijie , Wu, Bingzhou , Wang, Cong , Jia, Shenli . Experimental Investigation on the Current Carried by a Cathode Spot of Vacuum Arc in Axial Magnetic Fields . | IEEE TRANSACTIONS ON PLASMA SCIENCE , 2021 , 49 (5) , 1648-1653 . |
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Abstract ：
Flexible HVDC transmission has wide prospects in new energy grid connection and consumption, rail traction, and the urban distribution network in the future. Mechanical HVDC circuit breaker is one of the most potential breaking methods in the future due to its high current interruption ability and low on-state loss. Firstly, the parameters di/dt and du/dt which affect them breaking performance are analyzed in this paper. Then, the variation of voltage and current characteristics of a 10kV mechanical HVDC circuit breaker under different operating conditions are simulated with Matlab/Simulink. Finally, the impact of two typical circuit breaker failures on di/dt and du/dt were analyzed and compared. © 2020 IEEE.
Keyword ：
Electric circuit breakers HVDC power transmission Timing circuits
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| GB/T 7714 | Bao, Leilei , Mo, Yongpeng , Yang, Dawei et al. Research on Interrupting Processes of A 10 kV Mechanical HVDC Circuit Breaker [C] . 2020 : 928-932 . |
| MLA | Bao, Leilei et al. "Research on Interrupting Processes of A 10 kV Mechanical HVDC Circuit Breaker" . (2020) : 928-932 . |
| APA | Bao, Leilei , Mo, Yongpeng , Yang, Dawei , Yang, Minxiang , Shi, Zongqian , Jia, Shenli . Research on Interrupting Processes of A 10 kV Mechanical HVDC Circuit Breaker . (2020) : 928-932 . |
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Abstract ：
As the laser pumping source, pulsed xenon flash lamp is widely used in high power laser amplifier system such as inertial confinement fusion projects. The radiation efficiency of pulsed xenon flash lamp is the crucial parameter. In our previous work, it has been proven that the pulsed xenon flash lamp with annular section has higher radiation efficiency as well as laser amplifier efficiency compared with traditional flash lamp. To further improve the characteristics of this kind annular section flash lamp, a multi-electrode system was proposed for annular section flash lamp in this paper. Experimental results shown that the discharge channels established more quickly and expended fast to whole lamp tube space. Also the distribution of the discharge plasma is more uniform. The novel multi-electrode xenon flash lamp has been investigated in the aspects of the electrical characteristics, the discharge plasma channel, radiation and neodymium doped glass fluorescence. Experimental results show that discharge and radiation characteristics of xenon flash lamp with multi-electrode structure are improved. The detail mechanisms of the improvements for the multi-electrode structure will be discussed in this paper.
Keyword ：
flash lamp fluorescence multi-electrode radiation efficiency
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| GB/T 7714 | Jia, Shenli , Mo, Yongpeng , Huang, Chumin et al. Research on discharge and radiation characteristics of multi-electrode high power pulsed xenon flash lamp [C] . 2019 . |
| MLA | Jia, Shenli et al. "Research on discharge and radiation characteristics of multi-electrode high power pulsed xenon flash lamp" . (2019) . |
| APA | Jia, Shenli , Mo, Yongpeng , Huang, Chumin , Fan, Shuwei , Liu, Jianjun , Li, Haibing . Research on discharge and radiation characteristics of multi-electrode high power pulsed xenon flash lamp . (2019) . |
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Abstract ：
The light out-coupling efficiency of top-emitting OLED devices with different micro-structures was investigated with the aid of software FDTD solutions. The micro-structures included surface grating, wavy shape and spherical micro lens respectively. The simulation results indicated that the micro-structure was helpful to improve the light out-coupling efficient of OLED. Further more a complex spherical crown surface micro-structure was designed. The light out-coupling efficient of top-emitting OLED with the complex spherical surface improved 14% compared that of the device with smooth surface and 6% compared with micro lens.
Keyword ：
FDTD Micro structure OLED Optimization design Top emitting
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| GB/T 7714 | Chen Nana , Fan Shuwei , Wu Zhaoxin et al. Simulation and optimization for the optical performance of Top-emitting OLED [C] . 2017 . |
| MLA | Chen Nana et al. "Simulation and optimization for the optical performance of Top-emitting OLED" . (2017) . |
| APA | Chen Nana , Fan Shuwei , Wu Zhaoxin , Jiao Bo , Shen Li Jia . Simulation and optimization for the optical performance of Top-emitting OLED . (2017) . |
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Abstract ：
This paper presents the experimental results of electrical explosion of tungsten (W) wires in a vacuum using a negative-polarity current pulse with a magnitude of 1-2 kA. Uniform wire explosions with deposited energy sufficient for full vaporization are achieved for 0.5 cm-long W wires with the help of dielectric coating and soldering. Experimental results show that the dielectric coating can give 2-3 times more energy deposition by delaying the voltage breakdown. In order to improve the electrical contact, the metallic oxide on the surface of the electrodes is removed with sandpaper, and then the W wire is soldered to the electrodes. It is found that the improved electrical contact does not have an obvious influence on increasing the energy deposition. However, from the optical images, it can be seen that the uniformity of the wire explosion is greatly improved, especially for the W wire with 2 lm polyimide coating. Therefore, the dielectric coating and good electrical contact are the two key factors to uniformly transform the W wire into a gaseous state. With this method, the uniform wire explosions for longer tungsten wires (1 and 2 cm) are also realized under the same experimental conditions. Published by AIP Publishing.
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| GB/T 7714 | Shi, Yuanjie , Shi, Zongqian , Wang, Kun et al. Factors affecting the exploding characteristics of tungsten wires with negative-polarity current [J]. | PHYSICS OF PLASMAS , 2017 , 24 (1) . |
| MLA | Shi, Yuanjie et al. "Factors affecting the exploding characteristics of tungsten wires with negative-polarity current" . | PHYSICS OF PLASMAS 24 . 1 (2017) . |
| APA | Shi, Yuanjie , Shi, Zongqian , Wang, Kun , Wu, Ziqian , Jia, Shenli . Factors affecting the exploding characteristics of tungsten wires with negative-polarity current . | PHYSICS OF PLASMAS , 2017 , 24 (1) . |
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Abstract ：
The motion of cathode spots plays a crucial important role in removing oxide layer on a metal surface by vacuum arc. In this paper, the characteristics of the motion of a single cathode spot on metal surface with oxide layer are investigated experimentally. Experiments are conducted in a detachable vacuum chamber. A hollow copper anode with a hole of 10 mm x 10 mm is used in order to observe the 2-D motion of the cathode spot. The motion of the cathode spot during the descaling process is photographed by a high-speed digital camera with an exposure time of 2 mu s. Experimental results indicate that there are slow motion and fast motion of the cathode spot during descaling process, and the slow motion is the basic characteristic in most of the descaling time. The probability distribution of the cathode spot's displacement and resident time, the average velocity, and the movement parameter S-2/t are analyzed quantitatively. The results indicate that with the increase of gap distance or the decrease of oxide layer thickness, the cathode spot becomes more active.
Keyword ：
Cathode spots gap distance motion oxide layer probability vacuum arc
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| GB/T 7714 | Li, Wenhui , Shi, Zongqian , Wang, Cong et al. The Motion Characteristics of a Single Cathode Spot in Removing Oxide Layer on Metal Surface by Vacuum Arc [J]. | IEEE TRANSACTIONS ON PLASMA SCIENCE , 2017 , 45 (1) : 106-112 . |
| MLA | Li, Wenhui et al. "The Motion Characteristics of a Single Cathode Spot in Removing Oxide Layer on Metal Surface by Vacuum Arc" . | IEEE TRANSACTIONS ON PLASMA SCIENCE 45 . 1 (2017) : 106-112 . |
| APA | Li, Wenhui , Shi, Zongqian , Wang, Cong , Shi, Fei , Jia, Shenli , Wang, Lijun . The Motion Characteristics of a Single Cathode Spot in Removing Oxide Layer on Metal Surface by Vacuum Arc . | IEEE TRANSACTIONS ON PLASMA SCIENCE , 2017 , 45 (1) , 106-112 . |
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Abstract ：
Due to the peculiar magnetic properties and the ability to function in cell-level biological interaction, superparamagnetic nanoparticles (SMNP) have been being the attractive carrier for gene delivery. The superparamagnetic nanoparticles with surface-bound gene vector can be attracted to the surface of cells by the Kelvin force provided by external magnetic field. In this article, the influence of the oscillating magnetic field on the characteristics of magnetofection is studied in terms of the magnetophoretic velocity. The magnetic field of a cylindrical permanent magnet is calculated by equivalent current source (ECS) method, and the Kelvin force is derived by using the effective moment method. The results show that the static magnetic field accelerates the sedimentation of the particles, and drives the particles inward towards the axis of the magnet. Based on the investigation of the magnetophoretic velocity of the particle under horizontally oscillating magnetic field, an oscillating velocity within the amplitude of the magnet oscillation is observed. Furthermore, simulation results indicate that the oscillating amplitude plays an important role in regulating the active region, where the particles may present oscillating motion. The analysis of the magnetophoretic velocity gives us an insight into the physical mechanism of the magnetofection. It's also helpful to the optimal design of the magnetofection system.
Keyword ：
Cell Gene delivery Kelvin force Magnetofection Oscillating magnetic field Superparamagnetic nanoparticles
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| GB/T 7714 | Sun, Jiajia , Shi, Zongqian , Jia, Shenli et al. The force analysis for superparamagnetic nanoparticles-based gene delivery in an oscillating magnetic field [J]. | JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS , 2017 , 427 : 85-89 . |
| MLA | Sun, Jiajia et al. "The force analysis for superparamagnetic nanoparticles-based gene delivery in an oscillating magnetic field" . | JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS 427 (2017) : 85-89 . |
| APA | Sun, Jiajia , Shi, Zongqian , Jia, Shenli , Zhang, Pengbo . The force analysis for superparamagnetic nanoparticles-based gene delivery in an oscillating magnetic field . | JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS , 2017 , 427 , 85-89 . |
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