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  • AIP Publishing  (18)
  • 1
    Online Resource
    Online Resource
    Airflow acceleration performance of asymmetric surface dielectric barrier discharge actuators at different exposed needle electrode heights
    AIP Publishing ; 2015
    In:  Journal of Applied Physics Vol. 118, No. 22 ( 2015-12-14)
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 118, No. 22 ( 2015-12-14)
    Abstract: The use of plasma, created by asymmetric surface dielectric barrier discharge (ASDBD), as aerodynamic actuators to control airflows, has been of widespread concern over the past decades. For the single ASDBD, the actuator performance is dependent on the geometry of actuator and the produced plasma. In this work, a new electrode configuration, i.e., a row of needle, is taken as an exposed electrode for the ASDBD plasma actuator, and the electrode height is adjustable. The effects of different electrode heights on the airflow acceleration behavior are experimentally investigated by measuring surface potential distribution, ionic wind velocity, and mean thrust force production. It is demonstrated that the airflow velocity and thrust force increase with the exposed electrode height and the best actuator performance can be obtained when the exposed electrode is adjusted to an appropriate height. The difference, as analyzed, is mainly due to the distinct plasma spatial distributions at different exposed electrode heights.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.4937160
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2015
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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  • 2
    Online Resource
    Online Resource
    Experimental investigation of SDBD plasma actuator driven by AC high voltage with a superimposed positive pulse bias voltage
    AIP Publishing ; 2017
    In:  Physics of Plasmas Vol. 24, No. 8 ( 2017-08-01)
    Details
    In: Physics of Plasmas, AIP Publishing, Vol. 24, No. 8 ( 2017-08-01)
    Abstract: In this work, a driven voltage consisting of AC high voltage with a superimposed positive pulse bias voltage (“AC+ Positive pulse bias” voltage) is adopted to study the performance of a surface dielectric barrier discharge plasma actuator under atmospheric conditions. To compare the performance of the actuator driven by single-AC voltage and “AC+ Positive pulse bias” voltage, the actuator-induced thrust force and power consumption are measured as a function of the applied AC voltage, and the measured results indicate that the thrust force can be promoted significantly after superimposing the positive pulse bias voltage. The physical mechanism behind the thrust force changes is analyzed by measuring the optical properties, electrical characteristics, and surface potential distribution. Experimental results indicate that the glow-like discharge in the AC voltage half-cycle, next to the cycle where a bias voltage pulse has been applied, is enhanced after applying the positive pulse bias voltage, and this perhaps is the main reason for the thrust force increase. Moreover, surface potential measurement results reveal that the spatial electric field formed by the surface charge accumulation after positive pulse discharge can significantly affect the applied external electric field, and this perhaps can be responsible for the experimental phenomenon that the decrease of thrust force is delayed by pulse bias voltage action after the filament discharge occurs in the glow-like discharge region. The schlieren images further verify that the actuator-induced airflow velocity increases with the positive pulse voltage.
    Type of Medium: Online Resource
    ISSN: 1070-664X , 1089-7674
    URL: Article
    DOI: 10.1063/1.4994322
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2017
    detail.hit.zdb_id: 1472746-8
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  • 3
    Online Resource
    Online Resource
    Surface potential distribution and airflow performance of different air-exposed electrode plasma actuators at different alternating current/direct current voltages
    AIP Publishing ; 2015
    In:  Physics of Plasmas Vol. 22, No. 4 ( 2015-04-01)
    Details
    In: Physics of Plasmas, AIP Publishing, Vol. 22, No. 4 ( 2015-04-01)
    Abstract: Asymmetric surface dielectric barrier discharge (SDBD) plasma actuators have been intensely studied for a number of years due to their potential applications for aerodynamic control. In this paper, four types of actuators with different configurations of exposed electrode are proposed. The SDBD actuators investigated are driven by dual-power supply, referred to as a fixed AC high voltage and an adjustable DC bias. The effects of the electrode structures on the dielectric surface potential distribution, the electric wind velocity, and the mean thrust production are studied, and the dominative factors of airflow acceleration behavior are revealed. The results have shown that the actions of the SDBD actuator are mainly dependent on the geometry of the exposed electrode. Besides, the surface potential distribution can effectively affect the airflow acceleration behavior. With the application of an appropriate additional DC bias, the surface potential will be modified. As a result, the performance of the electric wind produced by a single SDBD can be significantly improved. In addition, the work also illustrates that the actuators with more negative surface potential present better mechanical performance.
    Type of Medium: Online Resource
    ISSN: 1070-664X , 1089-7674
    URL: Article
    DOI: 10.1063/1.4919628
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2015
    detail.hit.zdb_id: 1472746-8
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  • 4
    Online Resource
    Online Resource
    Calibration of the linear response range of x-ray imaging plates and their reader based on image grayscale values
    AIP Publishing ; 2017
    In:  Review of Scientific Instruments Vol. 88, No. 8 ( 2017-08-01)
    Details
    In: Review of Scientific Instruments, AIP Publishing, Vol. 88, No. 8 ( 2017-08-01)
    Abstract: X-ray imaging plates are one of the most important X-ray imaging detectors and are widely used in inertial-confinement fusion experiments. However, their linear response range, which is the foundation of their quantitative data analysis, has not been sufficiently deeply investigated. In this work, we develop an X-ray fluorescer calibration system and carefully explore the linear response range of X-ray imaging plates. For the first time, nearly the entire grayscale range of the X-ray imaging plate linear response—7819–64 879 in the range of 0–65 535—has been observed. Further, we discuss the uncertainties involved in the calibration process. This work demonstrates the excellent linear response qualities of X-ray imaging plates and provides a significant foundation for expanding their quantitative applied range.
    Type of Medium: Online Resource
    ISSN: 0034-6748 , 1089-7623
    URL: Article
    DOI: 10.1063/1.5000059
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2017
    detail.hit.zdb_id: 209865-9
    detail.hit.zdb_id: 1472905-2
    SSG: 11
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  • 5
    Online Resource
    Online Resource
    Tunable negative refractions in two-dimensional photonic crystals with superconductor constituents
    AIP Publishing ; 2005
    In:  Journal of Applied Physics Vol. 97, No. 7 ( 2005-04-01)
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 97, No. 7 ( 2005-04-01)
    Abstract: In this paper, a two-dimensional square photonic crystal (PC) with superconductor cylinders is proposed to realize tunable negative refraction. Based on the dependence of the superconductors’ permittivity on temperatures, photonic band structures thus negative refraction could be tuned by temperatures, whereby the refractive angle could be scanned from positive to negative. The feasibility of the PC operating in infrared and visible regions was discussed. The tunability resulted from the lattice, superconductors, operating frequency, and incident angle may lead the PC to great promise in photoelectronics and superconductor electronic applications.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.1866473
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2005
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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  • 6
    Online Resource
    Online Resource
    Defects of laser-irradiated KDP crystals with different fluences studied by photoluminescence spectroscopy
    AIP Publishing ; 2020
    In:  Matter and Radiation at Extremes Vol. 5, No. 3 ( 2020-05-01)
    Details
    In: Matter and Radiation at Extremes, AIP Publishing, Vol. 5, No. 3 ( 2020-05-01)
    Abstract: Photoluminescence (PL) bands from potassium dihydrogen phosphate (KDP) crystals are studied by time-resolved PL spectroscopy. KDP crystals irradiated at a laser fluence of 11.5 J/cm2 are found to have the highest probability of phosphorus–oxygen hole center defects and the lowest probability of phosphorus-oxygen electric center defects, in contrast to the probabilities of these defects for KDP crystals irradiated at 9.0 J/cm2. The probabilities of these two defects occurring in retired components are found to be intermediate between those for crystals irradiated at the two different fluences. The two types of defects may result from two different mechanisms and may interconvert under certain conditions. Thus, there are differences between the defects in KDP crystals irradiated at a high laser fluence and those in retired components.
    Type of Medium: Online Resource
    ISSN: 2468-2047 , 2468-080X
    URL: Article
    DOI: 10.1063/1.5143289
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2020
    detail.hit.zdb_id: 2858469-7
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  • 7
    Online Resource
    Online Resource
    Enhanced thermal stability of carbon nanotubes by plasma surface modification in Al2O3 composites
    AIP Publishing ; 2008
    In:  Journal of Applied Physics Vol. 104, No. 7 ( 2008-10-01)
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 104, No. 7 ( 2008-10-01)
    Abstract: A plasma polymerization method was employed to deposit an ultrathin pyrrole film of 3 nm onto the surfaces of single wall carbon nanotubes (SWCNTs) and Al2O3 nanoparticles for developing high-strength nanocomposites. The surfaces of plasma coated SWCNTs and Al2O3 nanoparticles were studied by high resolution transmission electron microscopy (TEM) and time-of-flight secondary ion mass spectroscopy. After sintering the SWCNTs-Al2O3 composites at different temperatures (maximum of 1200 °C), the thermal stability of plasma-coated SWCNTs was significantly increased, compared to their uncoated counterparts. After hot-press sintering, the SWCNTs without plasma coating were essentially decomposed into amorphous clusters in the composites, leading to degraded mechanical properties. However, under the same sintering conditions, the plasma surface modified SWCNTs were well preserved and distributed in the composite matrices. The effects of plasma surface coating on the thermal stability of SWCNTs and mechanical behavior of the nanocomposites are discussed.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.2985915
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2008
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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  • 8
    Online Resource
    Online Resource
    Optical superimposed vortex beams generated by integrated holographic plates with blazed grating
    AIP Publishing ; 2017
    In:  Applied Physics Letters Vol. 111, No. 6 ( 2017-08-07)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 111, No. 6 ( 2017-08-07)
    Abstract: In this paper, we demonstrate that the superposition of two vortex beams with controlled topological charges can be realized by integrating two holographic plates with blazed grating. First, the holographic plate with blazed grating was designed and fabricated by laser direct writing for generating well-separated vortex beam. Then, the relationship between the periods of blazed grating and the discrete angles of vortex beams was systemically investigated. Finally, through setting the discrete angle and different revolving direction of the holographic plates, the composite fork-shaped field was realized by the superposition of two vortex beams in a particular position. The topological charges of composite fork-shaped field (l = 1, 0, 3, and 4) depend on the topological charges of compositional vortex beams, which are well agreed with the theoretical simulation. The method opens up a wide range of opportunities and possibilities for applying in optical communication, optical manipulations, and photonic integrated circuits.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.4997590
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2017
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 9
    Online Resource
    Online Resource
    Dynamics of particles near the surface of a medium under ultra-strong shocks
    AIP Publishing ; 2021
    In:  Matter and Radiation at Extremes Vol. 6, No. 2 ( 2021-03-01)
    Details
    In: Matter and Radiation at Extremes, AIP Publishing, Vol. 6, No. 2 ( 2021-03-01)
    Abstract: Through nonequilibrium molecular dynamics simulations, we provide an atomic-scale picture of the dynamics of particles near the surface of a medium under ultra-strong shocks. This shows that the measured surface velocity vf under ultra-strong shocks is actually the velocity of the critical surface at which the incident probe light is reflected, and vf has a single-peaked structure. The doubling rule commonly used in the case of relatively weak shocks to determine particle velocity behind the shock front is generally not valid under ultra-strong shocks. After a short period of acceleration, vf exhibits a long slowly decaying tail, which is not sensitive to the atomic mass of the medium. A scaling law for vf is also proposed, and this may be used to improve the measurement of particle velocity u in future experiments.
    Type of Medium: Online Resource
    ISSN: 2468-2047 , 2468-080X
    URL: Article
    DOI: 10.1063/5.0030906
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2021
    detail.hit.zdb_id: 2858469-7
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  • 10
    Online Resource
    Online Resource
    Origins of axial inhomogeneity of magnetic performance in hot deformed Nd-Fe-B ring magnets
    AIP Publishing ; 2012
    In:  Journal of Applied Physics Vol. 111, No. 7 ( 2012-04-01)
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 111, No. 7 ( 2012-04-01)
    Abstract: Hot-deformed Nd-Fe-B ring magnets have wide potential applications. These ring magnets, however, exhibit axial inhomogeneity of magnetic performance. In this work, the effects of density, pressure, deformation temperature, deformation rate, and texture on axial magnetic performance were investigated over ring magnets prepared by backward extrusion method. It was demonstrated that the texture accounted for the variation of magnetic performance along axial direction. Microstructures of the ring magnets were examined with SEM, which further revealed two different origins of axial inhomogeneity of magnetic performance. The deformation degree of Nd-Fe-B grains plays a critical role in the performance difference between the top and middle part of ring magnet. But that between the middle and bottom part mainly results from different alignment orientations of platelet Nd-Fe-B grains. It was both deformation degree and alignment orientation that determined the axial texture and consequent magnetic performance of hot-deformed ring magnets.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.3677933
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2012
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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