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学者姓名:贾申利

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The Motion Characteristics of a Single Cathode Spot in Removing Oxide Layer on Metal Surface by Vacuum Arc EI SCIE Scopus
期刊论文 | 2017 , 45 (1) , 106-112 | IEEE TRANSACTIONS ON PLASMA SCIENCE | IF: 1.253
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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 probability vacuum arc oxide layer motion gap distance

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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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Numerical investigation on the growth process and size distribution of nanoparticles obtained through electrical explosion of aluminum wire EI SCIE Scopus
期刊论文 | 2017 , 50 (7) | JOURNAL OF PHYSICS D-APPLIED PHYSICS | IF: 2.373
SCOPUS Cited Count: 1
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Abstract :

Numerical investigations on the formation process and the final size distribution of nanoparticles during electrical explosion of Al wire are carried out. Firstly, the formation of the atomic vapor clusters is investigated. It indicates that the Al wire does not reach its atomization conditions. The size of the atomic vapor clusters is obtained, and it increases with the temperature at explosion. Then the growth process of Al nanoparticles from the formed atomic vapor clusters is modeled and the size distribution is predicted. The size distribution at different temperatures indicates that the growth process of Al nanoparticles becomes inactive gradually as the temperature decreases. The investigation of the size distribution under different cooling rates indicates that the bigger cooling rate is favorable for the formation of Al nanoparticles with smaller size dispersion and lower average dimension. The size distribution of Al nanoparticles obtained by the model is qualitatively consistent with the experimental data, which demonstrates the feasibility of this model.

Keyword :

nodal method nanoparticles electrical explosion

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GB/T 7714 Bai, Jun , Shi, Zongqian , Jia, Shenli . Numerical investigation on the growth process and size distribution of nanoparticles obtained through electrical explosion of aluminum wire [J]. | JOURNAL OF PHYSICS D-APPLIED PHYSICS , 2017 , 50 (7) .
MLA Bai, Jun et al. "Numerical investigation on the growth process and size distribution of nanoparticles obtained through electrical explosion of aluminum wire" . | JOURNAL OF PHYSICS D-APPLIED PHYSICS 50 . 7 (2017) .
APA Bai, Jun , Shi, Zongqian , Jia, Shenli . Numerical investigation on the growth process and size distribution of nanoparticles obtained through electrical explosion of aluminum wire . | JOURNAL OF PHYSICS D-APPLIED PHYSICS , 2017 , 50 (7) .
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Spatial confinement in laser-induced breakdown spectroscopy EI SCIE Scopus
期刊论文 | 2017 , 50 (1) | JOURNAL OF PHYSICS D-APPLIED PHYSICS | IF: 2.373
WoS CC Cited Count: 6 SCOPUS Cited Count: 11
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Abstract :

The spatial confinement of plasma produced by a nanosecond laser is investigated using time resolved spectroscopy, fast imaging, interferometry, and numerical computation. The dynamics of the plasma, depending on shock waves, laser power, and wall distances, are studied. Experimental results confirm that the plasma is constricted by the reflected shock associated with a temperature and density gradient. The peak laser power determines the initial plasma parameters which affect the spectral intensities and the velocity of the reflective shock waves. The wall distance determines the reflection time of the shocks, which in turn influences the time delay of the collision between the two reflective shocks. The numerical results reveal a fast propagation process surrounding the reflective shocks, which indicates that the velocity of the reflective shock wave is influenced by the density of the plasma. The maximum enhancement factor similar to 5.2 is realized at a delay time of 11.7 mu s under a pulse laser energy of 180 mJ and a wall distance of 9 mm.

Keyword :

laser produced plasma spatial confinement laser induced breakdown spectroscopy

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GB/T 7714 Li, Xingwen , Yang, Zefeng , Wu, Jian et al. Spatial confinement in laser-induced breakdown spectroscopy [J]. | JOURNAL OF PHYSICS D-APPLIED PHYSICS , 2017 , 50 (1) .
MLA Li, Xingwen et al. "Spatial confinement in laser-induced breakdown spectroscopy" . | JOURNAL OF PHYSICS D-APPLIED PHYSICS 50 . 1 (2017) .
APA Li, Xingwen , Yang, Zefeng , Wu, Jian , Wei, Wenfu , Qiu, Yan , Jia, Shenli et al. Spatial confinement in laser-induced breakdown spectroscopy . | JOURNAL OF PHYSICS D-APPLIED PHYSICS , 2017 , 50 (1) .
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Factors affecting the exploding characteristics of tungsten wires with negative-polarity current EI SCIE Scopus
期刊论文 | 2017 , 24 (1) | PHYSICS OF PLASMAS | IF: 1.941
WoS CC Cited Count: 4 SCOPUS Cited Count: 5
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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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The force analysis for superparamagnetic nanoparticles-based gene delivery in an oscillating magnetic field EI SCIE Scopus
期刊论文 | 2017 , 427 , 85-89 | JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | IF: 3.046
WoS CC Cited Count: 1 SCOPUS Cited Count: 2
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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 :

Gene delivery Kelvin force Oscillating magnetic field Cell Magnetofection 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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Suppressing the asymmetrical structures of the wire array Z-pinch CPCI-S
会议论文 | 2016 | 27th International Symposium on Discharges and Electrical Insulation in Vacuum (ISDEIV)
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A series of experiments have been carried out to suppress these asymmetrical structures of the wire-array Z pinch by applying a fast rising prepulse current and using insulated coatings. The single wire or a multiwire array load is investigated by a set of diagnostics with high temporal and spatial resolution including laser probing, high speed photography, and etc. Under a 1 kA, 100 A/ns current, corona free explosions of aluminum and tungsten wires are fulfilled by using the 2-3 mu m thickness dielectric coatings. Then these metallic vapors expand freely in the vacuum and two neighboring columns collide with each other, forming a stagnation region in the middle of the wires rather than a uniform gas shell. With the help of dielectric coatings, ablation and precursor plasmas are greatly suppressed for tungsten wires on a 100 kA facility. Based on the experimental results above, a dual-pulse generator "Qin-1" facility ( a 10 kA prepulse and a 1 MA main pulsed) is designed and built up, and experiments on the implosion and stagnation stage of the preconditioned wire array Z-pinch will be conducted.

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GB/T 7714 Wu, J. , Jia, S. L. , Qiu, A. C. . Suppressing the asymmetrical structures of the wire array Z-pinch [C] . 2016 .
MLA Wu, J. et al. "Suppressing the asymmetrical structures of the wire array Z-pinch" . (2016) .
APA Wu, J. , Jia, S. L. , Qiu, A. C. . Suppressing the asymmetrical structures of the wire array Z-pinch . (2016) .
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Experimental Investigation on HVDC Vacuum Circuit Breaker Based on Artificial Current Zero CPCI-S
会议论文 | 2016 | 27th International Symposium on Discharges and Electrical Insulation in Vacuum (ISDEIV)
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With the development of HVDC technology, the demand of HVDC circuit breaker is becoming urgent, whereas, a commercial HVDC circuit breaker is still not available. A prototype of HVDC circuit breaker based on artificial current zero and its testing scheme is proposed in this paper. Then the DC interruption experiment is carried on. In the DC interruption experiment, an 8kA DC current is interrupted and the interruption process is analyzed. In the experiment, LC source is used as the current source, and two vacuum interrupters are connected in series to form the main circuit breaker. Experiments are conducted to interrupt current of 8kA with the peak of the transient interruption voltage up to 110kV.

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GB/T 7714 Zhang, Yingkui , Shi, Zongqian , Wang, Qiaosen et al. Experimental Investigation on HVDC Vacuum Circuit Breaker Based on Artificial Current Zero [C] . 2016 .
MLA Zhang, Yingkui et al. "Experimental Investigation on HVDC Vacuum Circuit Breaker Based on Artificial Current Zero" . (2016) .
APA Zhang, Yingkui , Shi, Zongqian , Wang, Qiaosen , Gao, Zhanpeng , Jia, Shenli , Wang, Lijun . Experimental Investigation on HVDC Vacuum Circuit Breaker Based on Artificial Current Zero . (2016) .
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Research on the Experimental Method for HVDC Vacuum Circuit Breaker Based on Artificial Current Zero CPCI-S
会议论文 | 2016 | 27th International Symposium on Discharges and Electrical Insulation in Vacuum (ISDEIV)
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Abstract :

With the development of HVDC technology, the demand of HVDC circuit breaker is more and more urgent, where the testing standards for HVDC circuit breaker is still absent. It's impractical to carry out test in the real HVDC system at present. The high-power HVDC source is also a high-cost scheme. Therefore, in most of the experiments of HVDC circuit breaker, the current is supplied by AC source. In this paper, two experimental schemes based on LC source for HVDC circuit breaker are studied. The interruption process is simulated and compared among the DC source and LC source with two sets of parameters.

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GB/T 7714 Zhang, Yingkui , Shi, Zongqian , Wang, Qiaosen et al. Research on the Experimental Method for HVDC Vacuum Circuit Breaker Based on Artificial Current Zero [C] . 2016 .
MLA Zhang, Yingkui et al. "Research on the Experimental Method for HVDC Vacuum Circuit Breaker Based on Artificial Current Zero" . (2016) .
APA Zhang, Yingkui , Shi, Zongqian , Wang, Qiaosen , Jia, Shenli , Wang, Lijun . Research on the Experimental Method for HVDC Vacuum Circuit Breaker Based on Artificial Current Zero . (2016) .
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THE INFLUENCE OF INSULATING COATINGS ON THE ENERGY DEPOSITION AND PLASMA MORPHOLOGY OF THE ELECTRICAL EXPLOSION OF ALUMINUM AND TUNGSTEN WIRE CPCI-S
会议论文 | 2016 | 43rd IEEE International Conference on Plasma Science (ICOPS)
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GB/T 7714 Wang, Kun , Shi, Zongqian , Shi, Yuanjie et al. THE INFLUENCE OF INSULATING COATINGS ON THE ENERGY DEPOSITION AND PLASMA MORPHOLOGY OF THE ELECTRICAL EXPLOSION OF ALUMINUM AND TUNGSTEN WIRE [C] . 2016 .
MLA Wang, Kun et al. "THE INFLUENCE OF INSULATING COATINGS ON THE ENERGY DEPOSITION AND PLASMA MORPHOLOGY OF THE ELECTRICAL EXPLOSION OF ALUMINUM AND TUNGSTEN WIRE" . (2016) .
APA Wang, Kun , Shi, Zongqian , Shi, Yuanjie , Wu, Jian , Jia, Shenli . THE INFLUENCE OF INSULATING COATINGS ON THE ENERGY DEPOSITION AND PLASMA MORPHOLOGY OF THE ELECTRICAL EXPLOSION OF ALUMINUM AND TUNGSTEN WIRE . (2016) .
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NUMERICAL SIMULATION OF THE INITIAL EXPANSION PROCESS OF CATHODE SPOTS IN HIGH-CURRENT TRIGGERED VACUUM ARC CPCI-S
会议论文 | 2016 | 43rd IEEE International Conference on Plasma Science (ICOPS)
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GB/T 7714 Wang, Cong , Shi, Zongqian , Wu, Bingzhou et al. NUMERICAL SIMULATION OF THE INITIAL EXPANSION PROCESS OF CATHODE SPOTS IN HIGH-CURRENT TRIGGERED VACUUM ARC [C] . 2016 .
MLA Wang, Cong et al. "NUMERICAL SIMULATION OF THE INITIAL EXPANSION PROCESS OF CATHODE SPOTS IN HIGH-CURRENT TRIGGERED VACUUM ARC" . (2016) .
APA Wang, Cong , Shi, Zongqian , Wu, Bingzhou , Jia, Shenli , Wang, Lijun . NUMERICAL SIMULATION OF THE INITIAL EXPANSION PROCESS OF CATHODE SPOTS IN HIGH-CURRENT TRIGGERED VACUUM ARC . (2016) .
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