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  • 1
    Electronic Resource
    Electronic Resource
    The role of energetic electrons in self-oscillations of a discharge plasma (2001)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 8 (2001), S. 5006-5012 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The role of energetic electrons in periodic self-oscillations of a discharge plasma has been studied by measuring the spatiotemporal evolution of plasma potential, electron density, and electron velocity distribution function. It is found that the self-oscillation involves the instabilities of sheaths, propagation of a double layer and competition between the ionization, thermalization, and diffusion. The energetic electrons are the key factor which links these processes to form the oscillation cycle. The time interval of each phase in the cycle is estimated according to the physical process and the calculations are in agreement with experimental measurements. The study of the probe perturbation effect on the oscillations indicates that the length of the oscillation period is related to the amount of energetic electrons; the more energetic electrons, the shorter the period. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1406134
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  • 2
    Electronic Resource
    Electronic Resource
    Nonlinear wave interactions and evolution of a ring-beam distribution of energetic electrons (1988)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 31 (1988), S. 2238-2248 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A ring-beam distribution function of moderately relativistic electrons is unstable to electromagnetic and electrostatic waves. The results obtained in numerical simulations show that electromagnetic radiation corresponding to the normal modes of the background plasma is observed to grow even in the presence of a strong electrostatic instability and becomes very strong when the growth of the electrostatic Langmuir waves is minimized, and that the instability process is best described as a beam cyclotron resonance. Another strong radiation generated by the ring beam is the Z mode which is coupled to the electrostatic Langmuir wave. Under certain circumstances, these mechanisms may be significant in astrophysical situations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.867003
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  • 3
    Electronic Resource
    Electronic Resource
    A simulation for diffusions of charged particles in space correlation electric field (1992)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 4 (1992), S. 2459-2467 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A Monte Carlo method is used to simulate a turbulent electrostatic field that could process any given space correlation functions or corresponding power spectra. Then the diffusions of charged particles could be obtained by integrating the particle motion equations in this electric field. The simulation relative diffusion (without a magnetic field) shows good agreement with the analytic predictions on the extent of both quality and semiquantity. The simulation results in a strong magnetic field also agree qualitatively with both analytic theories and simulation results based on drift motion equation except for the parameter scaling law of diffusion coefficients. But the transverse relative diffusions in weak and middle magnetic fields are quite different from the analytic results. Two analytic discussions are provided for explaining these discrepancies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.860214
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  • 4
    Electronic Resource
    Electronic Resource
    Cubic-phase GaN light-emitting diodes (1999)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 74 (1999), S. 2498-2500 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The feasibility of growing device-quality cubic GaN/GaAs(001) films by metal organic chemical vapor deposition has been demonstrated. The optical quality of the GaN films was characterized by room-temperature photoluminescence measurements, which shows a full width at half maximum of 46 meV. The structural quality of the films was investigated by transmission electron microscopy. There are submicron-size grains free from threading dislocations and stacking faults. More importantly, a cubic-phase GaN blue light-emitting diode has been fabricated. The device process, which is very simple and compatible with current GaAs technology, indicates a promising future for the blue light-emitting diode. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.123019
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  • 5
    Electronic Resource
    Electronic Resource
    Electroluminescence from Au/Si nitride film/Si with the film prepared by electron cyclotron resonance method (1996)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 69 (1996), S. 4-6 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We use only nitrogen as the reaction gas to deposit on the cleaned Si wafer an extra-thin Si nitride film (∼40 A(ring)) by electron cyclotron resonance method. Electroluminescence (EL) with its peak wavelength at about 7000 A(ring) from the semitransparent Au/extra-thin Si nitride film/p-Si structure has been detected. The effects of forward bias and annealing on the EL have been studied. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.118115
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  • 6
    Electronic Resource
    Electronic Resource
    Far-field and beam characteristics of vertical-cavity surface-emitting lasers (1996)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 69 (1996), S. 1829-1831 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have determined the far-field patterns and beam parameters of vertical-cavity surface-emitting lasers (VCSELs) with different structures. The results show that the window diameter and the active-layer aperture of VCSELs strongly influence laser far-field distributions and beam characteristics; for VCSELs with small window ω=5 μm, only one dominant lobe has been observed in the far-field profiles, even though injected current was increased up to 2 Ith; and the smaller the ratio of the window diameter to the active-layer aperture, the larger is the far-field divergence. The laser structure dependence of the K factor has also been studied. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.117447
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  • 7
    Electronic Resource
    Electronic Resource
    In vitro formation by reverse dialysis of collagen gels containing highly oriented arrays of fibrils (1998)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 41 (1998), S. 185-191 
    Details
    ISSN: 0021-9304
    Keywords: type I ; orientation ; assembly ; order ; implant ; phase transition ; lyotropic ; rat ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: Acid extracts of rat tail tendon were subjected to reverse dialysis against 0.5% PEG at 4°C in an attempt to induce liquid crystallization. After 48 h, gel and fibril formation were initiated by continuing dialysis at 20°C against the same PEG solution adjusted to pH 7.4. The inclusion of calcium- or magnesium chloride (final concentration 0.3-33 mM) in the collagen solution before dialysis resulted in strongly birefringent gels that showed a progressive rotation of the slow axis of birefringence with increasing distance from the lateral margin of the gel. The gels contained fibers running predominantly in the plane of the flattened gel and crossing at angles of between 55° and 90°. We suggest that liquid crystallization is responsible for this phenomenon and that it might be possible to exploit this to produce materials for tissue engineering. © 1998 John Wiley & Sons, Inc. J Biomed Mater Res, 41, 185-191, 1998.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
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