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  • American Institute of Physics (AIP)  (5)
  • 2000-2004
  • 1985-1989  (5)
  • 1925-1929
  • 1989  (4)
  • 1985  (1)
  • 1928
  • 1
    Electronic Resource
    Electronic Resource
    Analysis of a four-variable model of coupled chemical oscillators (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 90 (1989), S. 3071-3080 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A simple model for the coupling of two chemical oscillators is proposed. The model consists of twotwo-variable subsystems, each of which gives rise to a "cross-shaped phase diagram'' containing two different steady states plus regions of bistability and of oscillation. The subsystems are coupled by diffusion of both species. Extensive numerical simulations reveal that when one subsystem is in the bistable and the other in the oscillatory region of the parameter space, coupling can result in birhythmicity, period doubling, and chaos. When both subsystems are in the oscillatory region, the coupled behavior is even richer, including quasiperiodicity, entrainment, chaos, and phase death (cessation of oscillations), with various hysteresis phenomena between these modes of behavior. The relation of these observations to behavior found experimentally in coupled chemical oscillators is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.455910
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  • 2
    Electronic Resource
    Electronic Resource
    Ambipolar diffusion length measurements in hydrogenated amorphous silicon (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 54 (1989), S. 2461-2463 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Many studies have been devoted in recent years to the experimental determination of the diffusion length of the minority carriers in hydrogenated amorphous silicon. The most popular method for this purpose was the surface photovoltage technique while the most novel method is the photocarrier grating technique. In the present work we report the first experimental comparison of the two methods. It is found that the first method yields values which are typically twice as large as those of the second method. This disagreement can be explained by the recent theoretical studies of the two methods. On the other hand, the present results seem to indicate how some more information on the electronic structure of the above material can be derived by future comparisons between theoretical and experimental results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.101072
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  • 3
    Electronic Resource
    Electronic Resource
    Experimental and numerical study of thermal transport in 24-beam ultraviolet irradiation of spherical targets (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 65 (1989), S. 969-977 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A series of thermal transport experiments using spectral-line signature and ion expansion measurements has been performed in spherical geometry using the 24 UV-converted beams of the Omega laser system at the Laboratory for Laser Energetics of the University of Rochester. Comparison with previous experiments employing only six beams shows a much better agreement in the mass ablation rate, when using 24 beams, between experimental results obtained from charge collectors and code simulations using a flux limiter of 0.1. The influence of nonuniformities in the irradiation, x-ray line reabsorption, and ionization time lag (non-LTE effects) were studied with the help of a collisional-radiative model. These processes were found to alter the falloff rates (determined mainly by the radical profile of the temperature) of the relative x-ray line intensity with overcoat thickness. With these effects included, agreement between calculated and measured burnthrough curves is greatly improved.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.343000
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  • 4
    Electronic Resource
    Electronic Resource
    The design and optimization of recombination extreme-ultraviolet lasers (1989)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 1 (1989), S. 214-220 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Recent evidence for amplification of the Balmer-alpha line of hydrogenlike carbon in a recombining plasma [Opt. Commun. 54, 289 (1985)] raises the question of the relative importance of radiative cooling in this experiment and of the role of radiative cooling in optimizing future experiments. This paper approaches this question using results from hydrodynamic and atomic-kinetic simulations of this experiment and some hypothetical variations. A new feature of these simulations is the use of an explicit nonlocal treatment of the Doppler-enhanced escape probability of resonance radiation to take into account opacity effects that are an important limitation of this and many other extreme-ultraviolet and x-ray laser schemes. It is shown that short-pulse (∼100 psec) illumination and cylindrical expansion are very important. Mixing is required for effective cooling of the carbon by a radiative coolant, but the resulting dilution of the lasant reduces the gain coefficient. It is found that amplification cannot be obtained with the prolonged heating caused by long (600 psec) pulses, even with radiative cooling. Gain results comparable to those of other workers have been obtained in simulations of hypothetical cases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.859089
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  • 5
    Electronic Resource
    Electronic Resource
    A model for stirring effects on transitions in bistable chemical systemsa) (1985)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 82 (1985), S. 53-57 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Experimental and model studies are reported of nucleation induced transitions between bistable states of a chemical reaction in a stirred tank reactor. In both systems studied, BrO−3–Br−–Mn2+ and ClO2−–I−, the rate of stirring has a marked effect upon the transition in one direction but not in the other. In both cases, good qualitative agreement is found between the experimental results and those of a simple, two-compartment reactor model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.448777
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