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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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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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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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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: 13
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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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Simulation and optimization for the optical performance of Top-emitting OLED EI CPCI-S Scopus
会议论文 | 2017 , 10362 | Conference on Organic Light Emitting Materials and Devices XXI
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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 :

Optimization design Top emitting Micro structure OLED FDTD

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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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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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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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Experimental investigation on the energy deposition and morphology of the electrical explosion of copper wire in vacuum EI SCIE Scopus
期刊论文 | 2016 , 23 (3) | PHYSICS OF PLASMAS | IF: 2.115
WoS CC Cited Count: 3 SCOPUS Cited Count: 5
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This paper presents the experimental results of the electrical explosion of copper wires in vacuum using negative nanosecond-pulsed current with magnitude of 1-2 kA. The 20 mu m-diameter copper wires with different lengths are exploded with three different current rates. A laser probe is applied to construct the shadowgraphy and interferometry diagnostics to investigate the distribution and morphology of the exploding product. The interference phase shift is reconstructed from the interferogram, by which the atomic density distribution is calculated. Experimental results show that there exist two voltage breakdown modes depending on the amount of the specific energy deposition. For the strong-shunting mode, shunting breakdown occurs, leading to the short-circuit-like current waveform. For the weak-shunting mode with less specific energy deposition, the plasma generated during the voltage breakdown is not enough to form a conductive plasma channel, resulting in overdamped declining current waveform. The influence of the wire length and current rate on the characteristics of the exploding wires is also analyzed. (C) 2016 AIP Publishing LLC.

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GB/T 7714 Shi, Zongqian , Shi, Yuanjie , Wang, Kun et al. Experimental investigation on the energy deposition and morphology of the electrical explosion of copper wire in vacuum [J]. | PHYSICS OF PLASMAS , 2016 , 23 (3) .
MLA Shi, Zongqian et al. "Experimental investigation on the energy deposition and morphology of the electrical explosion of copper wire in vacuum" . | PHYSICS OF PLASMAS 23 . 3 (2016) .
APA Shi, Zongqian , Shi, Yuanjie , Wang, Kun , Jia, Shenli . Experimental investigation on the energy deposition and morphology of the electrical explosion of copper wire in vacuum . | PHYSICS OF PLASMAS , 2016 , 23 (3) .
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Schlieren imaging investigation of the hydrodynamics of atmospheric helium plasma jets EI SCIE Scopus
期刊论文 | 2016 , 119 (12) | JOURNAL OF APPLIED PHYSICS | IF: 2.068
WoS CC Cited Count: 11 SCOPUS Cited Count: 11
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This work investigates the hydrodynamic characteristics of a coaxial double-ring electrode helium plasma jet by means of a "Z-type" Schlieren imaging system. The Schlieren images and visual optical photographs made show that a transition point from a laminar region to a turbulent region exists for gas flow without plasma when the helium flow rate exceeds a certain value. After plasma ignition, the laminar region shrinks with voltage increases, and the maximum length of the plasma plume is confined to the laminar region. The heat transfer equation and the spectral broadening of the He I 667.8 nm were used to estimate the increased gas temperature in the plasma jet, and the change in gas velocity by ionic momentum transfer was found by application of a double sphere collision model. As a result, gas heating is considered to be the dominant factor for the earlier onset of turbulence after plasma ignition, whereas the role of ion momentum transfer to neutral gas molecules is comparatively weak. The hydrodynamic behaviors of the plasma jet at the impact region for organic glass and silicon substrates are also researched. The ionization front propagates along the organic glass surface and contracts at the impact point on the silicon surface. More visible vortices are observed from Schlieren images with silicon substrates than with organic glass substrates. Possible mechanisms related to the different treatment effects are discussed. (C) 2016 AIP Publishing LLC.

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GB/T 7714 Zheng, Yashuang , Wang, Lijun , Ning, Wenjun et al. Schlieren imaging investigation of the hydrodynamics of atmospheric helium plasma jets [J]. | JOURNAL OF APPLIED PHYSICS , 2016 , 119 (12) .
MLA Zheng, Yashuang et al. "Schlieren imaging investigation of the hydrodynamics of atmospheric helium plasma jets" . | JOURNAL OF APPLIED PHYSICS 119 . 12 (2016) .
APA Zheng, Yashuang , Wang, Lijun , Ning, Wenjun , Jia, Shenli . Schlieren imaging investigation of the hydrodynamics of atmospheric helium plasma jets . | JOURNAL OF APPLIED PHYSICS , 2016 , 119 (12) .
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The effect of target materials on colliding laser-produced plasmas EI SCIE Scopus
期刊论文 | 2016 , 119 (13) | JOURNAL OF APPLIED PHYSICS | IF: 2.068
WoS CC Cited Count: 2
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In laser ablation, nanosecond to femtosecond lasers with a wide range of laser power densities are used. During ablation, the result of collisions between two plasmas is of interest to many researchers in inertial confinement fusion and nuclear astrophysics. In this paper, the collisions of two seed plasmas ablated from planar target surfaces of different target materials (Al, Cu, and W) were studied with temporal-spatially resolved imaging and spectroscopy. The initial relative velocities and densities of the seed plasmas were measured, and then the collisional parameters were calculated to evaluate the degree of the collisions. In addition, spatially resolved spectra were analyzed to study the influences of materials on the temporal-spatial distribution of atom or ions. The results indicated that under the same laser intensity, the high atomic number (Z) material had a small value of collisionality parameter, mostly because of its heavy ion mass. Higher laser intensity would increase the initial relative velocity of seed plasmas, resulting in a lower collision frequency. In addition, the distribution of the ions from seed plasmas was influenced by the stagnation layer plasmas. (C) 2016 AIP Publishing LLC.

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GB/T 7714 Li, Xingwen , Yang, Zefeng , Wu, Jian et al. The effect of target materials on colliding laser-produced plasmas [J]. | JOURNAL OF APPLIED PHYSICS , 2016 , 119 (13) .
MLA Li, Xingwen et al. "The effect of target materials on colliding laser-produced plasmas" . | JOURNAL OF APPLIED PHYSICS 119 . 13 (2016) .
APA Li, Xingwen , Yang, Zefeng , Wu, Jian , Han, Jiaxun , Wei, Wenfu , Jia, Shenli et al. The effect of target materials on colliding laser-produced plasmas . | JOURNAL OF APPLIED PHYSICS , 2016 , 119 (13) .
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Experimental investigation on the characteristics of the plasma jet of a low-current vacuum arc in axial magnetic fields EI SCIE Scopus
期刊论文 | 2016 , 49 (13) | JOURNAL OF PHYSICS D-APPLIED PHYSICS | IF: 2.588
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In this paper, the characteristics of the plasma jet of a low-current vacuum arc with a single cathode spot (CS) in an external axial magnetic field (AMF) up to 150 mT is investigated experimentally, at a constant arc current ranging from 20 A to 60 A. The experiments are conducted with Cu butt contacts in a demountable vacuum chamber. Images of the plasma jets are photographed with a high-speed digital camera with an exposure time of 2 mu s. The uniform constant AMF (Bn) within the inter-contacts region is supplied by Nd-Fe-B permanent magnets. The influence of the external AMF on the shape of the jet near the anode surface as well as in the arc column is mainly investigated. A luminous 'spot' is observed on the anode surface facing the position of the CS under a relatively strong AMF. The mechanism of the appearance of the luminous 'spot' is proposed to be connected to the secondary plasma originating from the anode. Moreover, with the increase in the strength of the AMF, the spreading angle of the cone-shaped plasma jet in the arc-column region decreases gradually. The plasma jet, subjected to a relatively strong AMF (120 mT and 150 mT), becomes cylindrical in shape in the arc-column region and conical in shape in the near-electrode regions. The overall geometry of the plasma jet looks like a dumbbell.

Keyword :

cathode spot axial magnetic field vacuum arc

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GB/T 7714 Wang, Cong , Shi, Zongqian , Wu, Bingzhou et al. Experimental investigation on the characteristics of the plasma jet of a low-current vacuum arc in axial magnetic fields [J]. | JOURNAL OF PHYSICS D-APPLIED PHYSICS , 2016 , 49 (13) .
MLA Wang, Cong et al. "Experimental investigation on the characteristics of the plasma jet of a low-current vacuum arc in axial magnetic fields" . | JOURNAL OF PHYSICS D-APPLIED PHYSICS 49 . 13 (2016) .
APA Wang, Cong , Shi, Zongqian , Wu, Bingzhou , Gao, Zhanpeng , Jia, Shenli , Wang, Lijun . Experimental investigation on the characteristics of the plasma jet of a low-current vacuum arc in axial magnetic fields . | JOURNAL OF PHYSICS D-APPLIED PHYSICS , 2016 , 49 (13) .
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