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学者姓名:史宗谦

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< Page ,Total 23 >
Study of the influences of different factors on the charged particles absorbed by the post-arc anode during the post-arc sheath expansion process in vacuum circuit breakers EI SCIE
期刊论文 | 2021 , 11 (1) | AIP Advances
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Abstract :

The dielectric recovery process has decisive effects on the current interruption process in vacuum circuit breakers, which has attracted the special attention of researchers. In commercial vacuum interrupters, ions and electrons of the residual plasma between the contact gap are separated and then fly to the electrodes under the effect of the transient recovery voltage after current zero. During this period, the post-arc current forms. During the formation of the post-arc current, ions also enter the post-arc anode due to their thermal motion. Therefore, the number of net electrons, which form the post-arc current, is only part of the total electrons between the contact gap at current zero. During the post-arc sheath expansion process, almost all electrons in the contact gap will enter the post-arc anode under the effects of the transient recovery voltage. If the proportion of ions and electrons, which enter the post-arc anode, can be obtained, the total number of electrons and consequently the residual plasma density between the contact gap could be estimated from the integration of the post-arc current. In this paper, the influences on the absorption of charged particles by the post-arc anode of some factors, e.g., rising rate of transient recovery voltage and metal vapor, have been simulated and discussed with a one-dimensional particle in cell-Monte Carlo collision model. © 2021 Author(s).

Keyword :

Molecular biology Metal recovery Electric circuit breakers Ions Transients Electrons Power quality Expansion Plasma density Anodes Vacuum technology Timing circuits

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GB/T 7714 Mo, Yongpeng , Shi, Zongqian , Jia, Shenli . Study of the influences of different factors on the charged particles absorbed by the post-arc anode during the post-arc sheath expansion process in vacuum circuit breakers [J]. | AIP Advances , 2021 , 11 (1) .
MLA Mo, Yongpeng 等. "Study of the influences of different factors on the charged particles absorbed by the post-arc anode during the post-arc sheath expansion process in vacuum circuit breakers" . | AIP Advances 11 . 1 (2021) .
APA Mo, Yongpeng , Shi, Zongqian , Jia, Shenli . Study of the influences of different factors on the charged particles absorbed by the post-arc anode during the post-arc sheath expansion process in vacuum circuit breakers . | AIP Advances , 2021 , 11 (1) .
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Theoretical investigation of the microfluidic and magnetic field-assisted self-assembly of colloidal magnetic-plasmonic nanoparticles EI SCIE
期刊论文 | 2021 , 54 (32) | JOURNAL OF PHYSICS D-APPLIED PHYSICS
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Abstract :

Patterning a wide range of colloidal plasmonic nanoparticles into prescribed spatial arrangements, analogous to the formation of natural materials, enables the fabrication of functionalized structures with novel optical properties, such as Fano resonance, magneto-optical Kerr effect, negative refraction, etc. Currently, capillarity-assisted particle assembly is always utilized to place colloidal particles at predetermined positions by exploiting the capillary forces resulting from the motion of an evaporating droplet. However, this technique requires specialized equipment and the assembly process is always carried out in an open system, thereby introducing the risk of contamination and limiting its applications. Here, we present a microfluidic and magnetic field-assisted self-assembly of colloidal magnetic-plasmonic nanoparticles by utilizing magnetic dipole-dipole interactions resulting from the localized magnetic gradient field produced by an array of soft-magnetic elements and external magnetic bias field. The magnetized magnetic-plasmonic nanoparticles are controlled to deposit at the predesigned traps microfabricated onto the soft-magnetic elements. After deposition, the inlet velocity of the microchannel is improved to clear away the particles out of the traps, forming arrays of patterns with consistent structures. Furthermore, a Lagrangian-Eulerian model is introduced for the first time to predict the processing of the microfluidic and magnetic field-assisted self-assembly of colloidal magnetic-plasmonic nanoparticles by taking the magnetic and hydrodynamic forces and particle-fluid interaction into account. Our analysis demonstrates that the particle-fluid interaction not only plays a significant role in determining the final self-assembled nanostructures, but provides an opportunity to improve the consistency of the assembled nanostructures. The microfluidic and magnetic field-assisted self-assembly protocol proposed here enables the patterning of colloidal magnetic-plasmonic nanoparticles to be carried out in a controlled environment and also opens up a new direction for assembling complex structures.

Keyword :

self-assembly magnetic field microfluidic magnetic-plasmonic nanoparticle

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GB/T 7714 Sun, Jiajia , Shi, Zongqian , Li, Mingjia et al. Theoretical investigation of the microfluidic and magnetic field-assisted self-assembly of colloidal magnetic-plasmonic nanoparticles [J]. | JOURNAL OF PHYSICS D-APPLIED PHYSICS , 2021 , 54 (32) .
MLA Sun, Jiajia et al. "Theoretical investigation of the microfluidic and magnetic field-assisted self-assembly of colloidal magnetic-plasmonic nanoparticles" . | JOURNAL OF PHYSICS D-APPLIED PHYSICS 54 . 32 (2021) .
APA Sun, Jiajia , Shi, Zongqian , Li, Mingjia , Chen, Shuang , Zhong, Mingjie , Liu, Xiaofeng et al. Theoretical investigation of the microfluidic and magnetic field-assisted self-assembly of colloidal magnetic-plasmonic nanoparticles . | JOURNAL OF PHYSICS D-APPLIED PHYSICS , 2021 , 54 (32) .
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Experimental Investigation on the Current Carried by a Cathode Spot of Vacuum Arc in Axial Magnetic Fields EI SCIE
期刊论文 | 2021 , 49 (5) , 1648-1653 | IEEE TRANSACTIONS ON PLASMA SCIENCE
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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 :

cathode spot vacuum arc threshold current splitting current Axial magnetic field (AMF)

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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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Three-dimensional numerical analysis of focusing and separation of diamagnetic particles in ferrofluid EI SCIE
期刊论文 | 2020 , 53 (31) | JOURNAL OF PHYSICS D-APPLIED PHYSICS | IF: 3.207
WoS CC Cited Count: 3
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Abstract :

Focusing and separation of particles and cells by magnetophoresis are important steps in many applications. In simple terms, the magnetophoresis can be classified into a positive one and a negative one. The most important characteristic of negative magnetophoresis is that particles and cells can be manipulated in a label-free manner. In this paper, continuous separation based on negative magnetophoresis is studied numerically using a three-dimensional model considering the interaction between particles and the ferrofluid. Firstly, the separation of two sized particles is investigated with a straight microchannel with two opposite permanent magnets for focusing particles before their separation by another bias magnet. Then the influence of size and position of permanent magnets and geometry of microchannel are investigated to achieve a better particle separation. Moreover, the effects of the concentration of the ferrofluid, the size difference of the particles, the magnet-channel distance and the flow velocity on the particle separation are analyzed.

Keyword :

microfluidics magnetic field magnetophoresis

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GB/T 7714 Shi, Zongqian , Chen, Shuang , Sun, Jiajia et al. Three-dimensional numerical analysis of focusing and separation of diamagnetic particles in ferrofluid [J]. | JOURNAL OF PHYSICS D-APPLIED PHYSICS , 2020 , 53 (31) .
MLA Shi, Zongqian et al. "Three-dimensional numerical analysis of focusing and separation of diamagnetic particles in ferrofluid" . | JOURNAL OF PHYSICS D-APPLIED PHYSICS 53 . 31 (2020) .
APA Shi, Zongqian , Chen, Shuang , Sun, Jiajia , Li, Mingjia , Jia, Shenli . Three-dimensional numerical analysis of focusing and separation of diamagnetic particles in ferrofluid . | JOURNAL OF PHYSICS D-APPLIED PHYSICS , 2020 , 53 (31) .
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Continuous separation of magnetic beads using a Y-shaped microfluidic system integrated with hard-magnetic elements EI SCIE
期刊论文 | 2020 , 53 (3) | JOURNAL OF PHYSICS D-APPLIED PHYSICS | IF: 3.207
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Abstract :

A Y-shaped microfluidic separator with an array of hard-magnetic elements integrated in a non-magnetic substrate is designed to realize continuous separation of magnetic beads under an external bias field. By fixing the magnetization directions of the hard-magnetic elements parallel to the wall of microchannel, the spatial distribution of the magnetic field can be adjusted by the geometrical size of elements, the gap between two neighboring elements, and the direction of the external bias field. In this work, magnetic beads comprising of multiple magnetic/superparamagnetic nanoparticles (10?nm Fe5Si3, Fe3Si or Fe3O4) in polymer matrixes are used. Herein, Kelvin force on the magnetic bead is described by treating each magnetized superparamagnetic nanoparticle as an equivalent magnetic dipole. With the closed-form Kelvin force, a two-way model that takes bead-fluid interaction into account is adopted to investigate the trajectories of magnetic beads in our Y-shaped microfluidic system. Using the two-way model, the influence of the beads? size, the direction of the external bias field, the magnetic bead concentration and the bead-fluid interaction on the trajectories of magnetic beads is also investigated. 100% collection or separation efficiency can be realized just by adjusting inlet velocities. In addition, it is theoretically demonstrated that two kinds of magnetic beads with small size difference (down to 100?nm) can be successfully separated by using our Y-shaped microfluidic separator.

Keyword :

hard-magnetic elements magnetic bead Fe5Si3 microfluidic separator superparamagnetic nanoparticle Fe3Si

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GB/T 7714 Sun, Jiajia , Wu, Kai , Su, Diqing et al. Continuous separation of magnetic beads using a Y-shaped microfluidic system integrated with hard-magnetic elements [J]. | JOURNAL OF PHYSICS D-APPLIED PHYSICS , 2020 , 53 (3) .
MLA Sun, Jiajia et al. "Continuous separation of magnetic beads using a Y-shaped microfluidic system integrated with hard-magnetic elements" . | JOURNAL OF PHYSICS D-APPLIED PHYSICS 53 . 3 (2020) .
APA Sun, Jiajia , Wu, Kai , Su, Diqing , Guo, Guannan , Shi, Zongqian . Continuous separation of magnetic beads using a Y-shaped microfluidic system integrated with hard-magnetic elements . | JOURNAL OF PHYSICS D-APPLIED PHYSICS , 2020 , 53 (3) .
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Numerical simulation on the formation and merging of ablation plasma in two exploding aluminum wires EI SCIE Scopus
期刊论文 | 2020 , 53 (33) | Journal of Physics D: Applied Physics | IF: 3.207
WoS CC Cited Count: 5 SCOPUS Cited Count: 5
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Abstract :

In this paper, computational results characterizing the formation and merging of counter-streaming interpenetrating plasma flows formed in exploding double parallel aluminum wires are presented. A radial magnetohydrodynamic computation is carried out first to obtain the parameters of core-corona structure in individual wires, providing an initial condition for the planar magnetohydrodynamic model in a multi-species fluids scheme with two-temperature treatment of plasma. In the XY plane, two aluminum plasma clouds are surrounded by extremely thin air, which represents a vacuum environment. A long-lasting compressed layer of extremely thin air in the central region of the inter-wire gap is formed before the merger of aluminum plasma flows. The accordance between the increasing mass fraction of aluminum plasma species in the central slit and the enhancement in self-emission light demonstrates that the real physical characteristics of extremely low-density vacuum environment plays an important role in merger of aluminum plasma flows. Current density is concentrated in the central column during the merging process of counter-streaming interpenetrating aluminum plasma flows, evolving from a structure of bifurcated current sheets into a single narrow sheet. Efficient numerical investigation on the interaction between counter-streaming plasma flows requires the incorporation of surrounding fluid species of extremely thin air. © 2020 IOP Publishing Ltd.

Keyword :

Magnetoplasma Plasma flow Plasma jets Exploding wires Aluminum Magnetohydrodynamics Air Merging Plasma devices

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GB/T 7714 Wang, Kun , Zhang, Yue , Jiang, Lincun et al. Numerical simulation on the formation and merging of ablation plasma in two exploding aluminum wires [J]. | Journal of Physics D: Applied Physics , 2020 , 53 (33) .
MLA Wang, Kun et al. "Numerical simulation on the formation and merging of ablation plasma in two exploding aluminum wires" . | Journal of Physics D: Applied Physics 53 . 33 (2020) .
APA Wang, Kun , Zhang, Yue , Jiang, Lincun , Wang, Tianhao , Shi, Zongqian . Numerical simulation on the formation and merging of ablation plasma in two exploding aluminum wires . | Journal of Physics D: Applied Physics , 2020 , 53 (33) .
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Research on Fast Opening Process in Electromagnetic Repulsion Mechanism EI SCIE Scopus
期刊论文 | 2019 , 55 (6) | IEEE TRANSACTIONS ON MAGNETICS
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Fast interruption is vitally important in high-voltage direct current (HVDC) system to suppress the rapid increase of short current. In this paper, a multi-physics coupling simulation model of a high-speed electromagnetic repulsion mechanism (ERM) which is a part of HVDC breaker is proposed. The opening process with an electromagnetic buffer of ERM is investigated. The simulation results including forces, currents, displacements, and velocities are analyzed. Furthermore, a prototype of ERM is designed and developed. Results show that the efficacy of the proposed simulation methodologies is verified by the experimental results. The opening process of ERM could be divided into six stages. During an opening action, the impact of collision on the motion of ERM cannot be ignored. A good buffering effect can be achieved by reasonably setting the related parameters of the electromagnetic buffer.

Keyword :

electromagnetic repulsion mechanism (ERM) multi-physics coupling analysis fast interruption Electromagnetic buffer

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GB/T 7714 Hou, Yushan , Shi, Zongqian , Li, Sheng et al. Research on Fast Opening Process in Electromagnetic Repulsion Mechanism [J]. | IEEE TRANSACTIONS ON MAGNETICS , 2019 , 55 (6) .
MLA Hou, Yushan et al. "Research on Fast Opening Process in Electromagnetic Repulsion Mechanism" . | IEEE TRANSACTIONS ON MAGNETICS 55 . 6 (2019) .
APA Hou, Yushan , Shi, Zongqian , Li, Sheng , Yao, Qiang , Miao, Yulong , Zhang, Shiling et al. Research on Fast Opening Process in Electromagnetic Repulsion Mechanism . | IEEE TRANSACTIONS ON MAGNETICS , 2019 , 55 (6) .
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Experimental and numerical analysis of the magnetophoresis of magnetic nanoparticles under the influence of cylindrical permanent magnet EI CPCI-S SCIE Scopus
期刊论文 | 2019 , 475 , 703-714 | Journal of Magnetism and Magnetic Materials
SCOPUS Cited Count: 3
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Abstract :

Dye-tracing and concentration-measuring experiments are carried out to investigate the magnetophoresis of magnetic nanoparticles (MNP) in the presence of an external cylindrical permanent magnet. The magnetophoresis of MNP, inducing an obvious forced-convective flowing of the carrier fluid, which can be observed by visualizing flowing of carrier fluid, results in a temporal and spatial variation of particle concentration. Moreover, in order to get insight into the physical mechanisms of magnetophoresis of MNP, a coupled particle-fluid analysis, in which the non-linear drift-diffusion differential equation is incorporated into the Navier-Stokes equation, is adopted to discuss the influence of particle-fluid interaction on the variation of particle concentration and the kinetics of carrier fluid. It is worth noting that the equivalent current source (ECS) method is adopted to obtain a closed-form field analysis, which provides exactly prediction of the Kelvin force and enables magnetophoretic analysis more efficient. In dye-tracing experiments, an obvious vortex can be observed as the methylene blue moves with the convection of carrier fluid. Furthermore, this phenomenon is also predicted by using the coupled particle-fluid model. A comparison between the experimental and numerical results shows that the hydrodynamic interactions between MNP and carrier fluid plays an important role in inducing forced-convective flowing of carrier fluid and enhancing the magnetophoresis of MNP. Furthermore, these results also denote that the coupled particle-fluid model provides a more efficient and accurate method in investigating the magnetophoresis of MNP. © 2018 Elsevier B.V.

Keyword :

Coupled particles Dye tracing Experimental and numerical analysis Hydrodynamic interaction Magnetic nano-particles Magnetophoresis Particle-fluid interaction Temporal and spatial variation

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GB/T 7714 Sun, Jiajia , Shi, Zongqian , Chen, Shuang et al. Experimental and numerical analysis of the magnetophoresis of magnetic nanoparticles under the influence of cylindrical permanent magnet [J]. | Journal of Magnetism and Magnetic Materials , 2019 , 475 : 703-714 .
MLA Sun, Jiajia et al. "Experimental and numerical analysis of the magnetophoresis of magnetic nanoparticles under the influence of cylindrical permanent magnet" . | Journal of Magnetism and Magnetic Materials 475 (2019) : 703-714 .
APA Sun, Jiajia , Shi, Zongqian , Chen, Shuang , Jia, Shenli . Experimental and numerical analysis of the magnetophoresis of magnetic nanoparticles under the influence of cylindrical permanent magnet . | Journal of Magnetism and Magnetic Materials , 2019 , 475 , 703-714 .
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Numerical investigation on the dynamics of aluminum wire explosions EI SCIE Scopus
期刊论文 | 2019 , 26 (5) | PHYSICS OF PLASMAS
WoS CC Cited Count: 1 SCOPUS Cited Count: 1
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Explosions of aluminum wires driven by a negative fast rising current (similar to 80A/ns) are numerically investigated by using a magnetohydrodynamic code with cold start conditions. A wide range of semi- empirical equations of state based on the Thomas-Fermi-Kirzhnits model and a modified Lee-More-Desjarlais conductivity model are used to model the behavior of the exploding product. The formation and the evolution of the core-corona structure are presented. The corona reaches a maximum temperature of similar to 100 eV after the voltage breakdown and expands at a constant speed of 39 km/s. The influence of the wire diameter on the characteristics of the explosion is studied, which shows the maximum energy deposition of 2.6 eV/atom at a wire diameter of 18.4 mu m. The simulation is compared with the previous experimental result and shows good agreement. Published under license by AIP Publishing.

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GB/T 7714 Shi, Yuanjie , Shi, Zongqian , Wang, Kun et al. Numerical investigation on the dynamics of aluminum wire explosions [J]. | PHYSICS OF PLASMAS , 2019 , 26 (5) .
MLA Shi, Yuanjie et al. "Numerical investigation on the dynamics of aluminum wire explosions" . | PHYSICS OF PLASMAS 26 . 5 (2019) .
APA Shi, Yuanjie , Shi, Zongqian , Wang, Kun , Ren, Zheng . Numerical investigation on the dynamics of aluminum wire explosions . | PHYSICS OF PLASMAS , 2019 , 26 (5) .
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Numerical Investigation on the Robson Drift of a Single Cathode Spot of Vacuum Arc EI SCIE Scopus
期刊论文 | 2019 , 47 (8) , 3442-3447 | IEEE TRANSACTIONS ON PLASMA SCIENCE
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The Robson drift phenomenon is a macroscopic reflection of the movement of a cathode spot (CS) in oblique magnetic field (OMF). Although it was discovered many years ago, its physical mechanism remains unclear. In this paper, the influence of OMF on the Robson drift of CS motion is simulated. A 2-D stepwise model of the movement of a single CS in OMF is established. It is assumed that the probability of generating a new spot in directions of Amperian force, anti-Amperian force, and directions perpendicular to Amperian force, is proportional to the magnetic pressure around the old spot. The drift angle and velocity of the CS in OMF are simulated. The simulation results show that the drift angle of the CS in OMF has liner relationship with the inclination angle of magnetic field, and it has no obvious relationship with the strength of the applied magnetic field and the amplitude of the arc current, which are in a good agreement with the experimental results. Besides, under the same angle of magnetic field, the velocity of spot motion increases linearly with the strength of OMF. Moreover, the simulation results show that the transverse magnetic field component has a much more predominant influence on the CS velocity than the axial magnetic field component, which are also in agreement with the experimental results.

Keyword :

Robson drift Cathode spot (CS) oblique magnetic field (OMF)

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GB/T 7714 Shi, Zongqian , Xu, Pengfei , Liu, Xin et al. Numerical Investigation on the Robson Drift of a Single Cathode Spot of Vacuum Arc [J]. | IEEE TRANSACTIONS ON PLASMA SCIENCE , 2019 , 47 (8) : 3442-3447 .
MLA Shi, Zongqian et al. "Numerical Investigation on the Robson Drift of a Single Cathode Spot of Vacuum Arc" . | IEEE TRANSACTIONS ON PLASMA SCIENCE 47 . 8 (2019) : 3442-3447 .
APA Shi, Zongqian , Xu, Pengfei , Liu, Xin , Jia, Shenli , Wang, Lijun . Numerical Investigation on the Robson Drift of a Single Cathode Spot of Vacuum Arc . | IEEE TRANSACTIONS ON PLASMA SCIENCE , 2019 , 47 (8) , 3442-3447 .
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