Bla i på forfattere "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)