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  • Other Sources  (3)
  • 2020-2022
  • 1990-1994  (3)
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  • 1
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    Generalized Radon Transformation inversion for elastic parameters using PP, Ps, SP, and SS seismic data (1990)
    Soc. Exp. Geophys.
    In:  60th Annual Meeting of SEG, San Francisco, Soc. Exp. Geophys., vol. 10, no. GL-TR-89-0259, pp. 1199-1202, (ISBN 0 08 042822 3)
    Details
    Publication Date: 1990
    Keywords: Inversion ; Seismics (controlled source seismology) ; Seismology
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    BIBLIOGRAPHY SEISMOLOGY
  • 2
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    Azimuthally-dependent Finite Element Solution to the Cylindrical Resonator (1994)
    In:  Other Sources
    Details
    Publication Date: 2018-06-08
    Description: The cylindrical cavity resonator loaded with an anisotropic dielectric is analyzed as a two-dimensional problem using a finite element approach that assumes sinusoidal dependence in azimuth. This methodology allows the first finite element treatment of the technically important case of a resonator containing a sapphire element with a cylindrically aligned c axis. Second order trial functions together with quadrilateral elements are adopted in the calculations. The method was validated through comparisons with the analytical solutions for the hollow metal cavity and a coaxial cavity, as well as through measurements on a shielded sapphire resonator.
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Evolution equation for infinitesimal rotational discontinuities (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: An evolution equation in the form of a modified Korteweg-de Vries equation is developed which describes the small-amplitude version of the infinitesimal rotational discontinuity (RD) studied by Wang and Sonnerup (1984). It is shown that the small-amplitude version of the equilibrium pulse solution obtained by Wang and Sonnerup is metastable and thus unlikely to arise spontaneously. When the initial pulse amplitude is smaller than and/or the initial pulse width is greater than the equilibrium value, the pulse decays. When the reverse is the case, the pulse is converted to an infinitesimal intermediate-mode solitary wave having greater pulse amplitude and speed. A simulation experiment is performed in which one of the equilibrium intermediate-mode solitary waves overtakes another, less rapidly moving version of the same wave. The existence of multipeaked intermediate-mode solitary pulses is demonstrated.
    Keywords: PLASMA PHYSICS
    Type: Physics of Fluids B (ISSN 0899-8221); 2; 3175-318
    Format: text
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    NASA TECHNICAL REPORTS
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