Frequency and amplitude alterations of sound modes in a space-dependent random mass density field (Articolo in rivista)

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Label
  • Frequency and amplitude alterations of sound modes in a space-dependent random mass density field (Articolo in rivista) (literal)
Anno
  • 2004-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1088/0959-7174/14/2/002 (literal)
Alternative label
  • MURAWSKI K; NOCERA L; PELINOVSKI E (2004)
    Frequency and amplitude alterations of sound modes in a space-dependent random mass density field
    in Waves in random media (Print); Taylor and Francis, Abingdon (Regno Unito)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • MURAWSKI K; NOCERA L; PELINOVSKI E (literal)
Pagina inizio
  • 109 (literal)
Pagina fine
  • 117 (literal)
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  • http://dx.doi.org/10.1088/0959-7174/14/2/002 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 14 (literal)
Rivista
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  • 9 (literal)
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  • 2 (literal)
Note
  • The Smithsonian/NASA Astrophysics Data System (literal)
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Nocera, L.: CNR, Inst Atom & Mol Phys, I-56124 Pisa, Italy Murawski, K.: Marie Curie Sklodowska Univ, Inst Phys, PL-20031 Lublin, Poland Pelinovsky, E.: Inst Appl Phys, Nizhnii Novgorod 603600, Russia (literal)
Titolo
  • Frequency and amplitude alterations of sound modes in a space-dependent random mass density field (literal)
Abstract
  • We investigate the effect of a space-dependent random mass density field on small amplitude acoustic modes that are settled in a semi-infinite medium of a temperature growing linearly with depth. Using a perturbation method, the dispersion relation is derived in the form of Hill's determinant. Numerical solutions of this equation lead to the following conclusions: (a) a weak random field (with ?eff = 0.05) essentially affects long waves which experience attenuation and a frequency reduction; (b) for a stronger random field (with ?eff = 0.1), high-order sound modes behave as sound waves as they are attenuated and their frequencies are increased; (c) for a sufficiently strong random field (with ?eff = 0.2), mode coupling occurs, as a result of which the dispersive curves cross each other, the sound modes loose their identities, and some modes are amplified. Here ?eff denotes the effective strength of a random field. (literal)
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