Browsing Brage IMR by Subject "VDP::Mathematics and natural science: 400::Physics: 430::Electromagnetism, acoustics, optics: 434"

Now showing items 21-26 of 26

    • Target strength of polarized fish 

      Foote, Kenneth G. (ICES CM documents, Working paper, 1987)
      The effect of behaviour on target strength is simulated through computation of the average target strength with respect to a range of normal orientation distributions. The mean tilt angle is varied from -30 to 30 deg for ...

    • Target strength of tiny roach 

      Foote, Kenneth G.; Lindem, Torfinn; Brabrand, Åge (ICES CM documents, Working paper, 1987)
      Seven frozen specimens of surface-adapted roach (Rutilus rutilus), of lengths 32-40 mm and masses 0.20-0.49 g, have been sectioned with a precision microtome. The swimbladder contours have been digitized and the swimbladder ...

    • The R package EchoviewR for automated processing of active acoustic data using Echoview 

      Harrison, Lisa-Marie K.; Cox, Martin J.; Skaret, Georg; Harcourt, Robert (Journal article; Peer reviewed, 2015-02-25)
      Acoustic data is time consuming to process due to the large data size and the requirement to often undertake some data processing steps manually. Manual processing may introduce subjective, irreproducible decisions into ...

    • The significance of fish behaviour in the evaluation of hydroacoustic survey data 

      Olsen, Kjell (ICES CM Documents;1981/B:22, Working paper, 1981)

    • Towards the acoustic estimation of jellyfish abundance 

      Brierley, Andrew S.; Boyer, D.; Axelsen, Bjørn Erik; Lynam, Christopher P.; Sparks, Conrad A. J.; Boyer, Helen; Gibbons, Mark J. (Journal article; Peer reviewed, 2005-06-23)
      Acoustic target strengths (TSs) of the 2 most common large medusae, Chrysaora hysoscella and Aequorea aequorea, in the northern Benguela (off Namibia) have previously been estimated (at 18, 38 and 120 kHz) from acoustic ...

    • Underwater sound measurements from fishing vessel "Brennholm" 

      Peña, Hector; Øvredal, Jan Tore; Totland, Bjørn; Handegard, Nils Olav (Working paper, 2011-08)
      A methodology for measuring underwater sound from free running vessels was implemented inside IMR, following American National Standard ANSI/ASA S12.64-2009 grade B. An array of 3 calibrated NEXUS hydrophones was mounted ...