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Browsing Brage IMR by Author "Francis, David T. I."

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    • Acoustic swimbladder resonance spectroscopy: fundamentals in scattering theory 

      Francis, David T. I.; Foote, Kenneth G. (Others, 2003)
    • Backscattering and extinction cross sections of two swimbladdered fishes at the lowest resonance, as modeled by the boundary-element method 

      Foote, Kenneth G.; Francis, David T. I. (Others, 2003)
    • Broadband echo spectra from euphausiids and copepods 

      Foote, Kenneth G.; Knutsen, Tor; Atkins, Philip R.; Bongiovanni, Claire; Francis, David T. I.; Eriksen, Peter K.; Larsen, Mette Torp; Mortensen, Tom (Others, 2000)
    • Calibration sphere for low-frequency parametric sonars 

      Foote, Kenneth G.; Francis, David T. I.; Atkins, Philip R. (Journal article; Peer reviewed, 2007)
      The problem of calibrating parametric sonar systems at low difference frequencies used in backscattering applications is addressed. A particular parametric sonar is considered: the Simrad TOPAS PS18 Parametric Sub-bottom ...
    • Comparing high-frequency scattering by a fish swimbladder and a gas-filled ellipsoid 

      Foote, Kenneth G.; Francis, David T. I. (Others, 2004)
    • Comparing Kirchhoff-approximation and boundary-element models for computing gadoid target strengths 

      Foote, Kenneth G.; Francis, David T. I. (Journal article; Peer reviewed, 2002)
      To establish the validity of the boundary-element method (BEM) for modeling scattering by swimbladder-bearing fish, the BEM is exercised in several ways. In a computation of backscattering by a 50-mm-diam spherical void ...
    • Depth-dependent target strengths of gadoids by the boundary-element method 

      Francis, David T. I.; Foote, Kenneth G. (Journal article; Peer reviewed, 2003)
      The depth dependence of fish target strength has mostly eluded experimental investigation because of the need to distinguish it from depth-dependent behavioral effects, which may change the orientation distribution. The ...
    • The fish swimbladder as an acoustic waveguide 

      Francis, David T. I.; Foote, Kenneth G. (Others, 2001)
    • Modeling the target strength of Calanus finmarchicus 

      Francis, David T. I.; Foote, Kenneth G.; Knutsen, Tor; Calise, Lucio (Others, 1999)
    • Modeling the target strength of Meganyctiphanes norvegica 

      Francis, David T. I.; Knutsen, Tor; Foote, Kenneth G.; Calise, Lucio (Others, 1999)
    • A seven-octave-bandwidth echo sounding system for application to fish and zooplankton 

      Foote, Kenneth G.; Knutsen, Tor; Atkins, Philip R.; Bongiovanni, Claire; Francis, David T. I.; Eriksen, Peter K.; Mortensen, Tom (Others, 1999)
    • Simple, nonoptimal, real-time classifiers for euphausiid and copepod numerical density estimation 

      Atkins, Philip R.; Bongiovanni, Claire; Francis, David T. I.; Foote, Kenneth G.; Knutsen, Tor; Eriksen, Peter K.; Larsen, Mette Torp; Mortensen, Tom (Others, 2001)
    • Spheres for calibrating high-frequency broadband echo sounders 

      Foote, Kenneth G.; Francis, David T. I.; Furset, Hilde; Hobæk, Halvor (Others, 1999)
    • Target strength spectra of swim-bladdered fish 

      Foote, Kenneth G.; Francis, David T. I. (Others, 1999)

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