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pro vyhledávání: '"Olson, Derek"'
Here we theoretically and computationally study the frequency dependence of phase speed and attenuation for marine sediments from the perspective of granular mechanics. We leverage recent theoretical insights from the granular physics community as we
Externí odkaz:
http://arxiv.org/abs/2405.06614
Autor:
Olson, Derek R, Geilhufe, Marc
In quantitative analysis of seafloor imagery, it is common to model the collection of individual pixel intensities scattered by the seafloor as a random variable with a given statistical distribution. There is a considerable literature on statistical
Externí odkaz:
http://arxiv.org/abs/2311.08337
Autor:
Olson, Derek R.
The Kirchhoff integral is a fundamental integral in scattering theory, appearing in both the Kirchhoff approximation, as well as the small slope approximation. In this work, a functional Taylor series approximation to the-eps-converted-to.pdf Kirchho
Externí odkaz:
http://arxiv.org/abs/2106.08287
Autor:
Olson, Derek R., Lyons, Anthony P.
Publikováno v:
J. Acoust. Soc. Am. (2021), (149) 1, 28-49
Contemporary high-resolution sonar systems use broadband pulses and long arrays to achieve high resolution. It is important to understand effects that high-resolution sonar systems might have on quantitative measures of the scattered field due to the
Externí odkaz:
http://arxiv.org/abs/2106.05909
Autor:
Olson, Derek R., Jackson, Darrell
Acoustic scattering from layered seafloors exhibits dependence on both the mean geoacoustic layering, as well as the roughness properties of each layer. Several theoretical treatments of this environment exist, including the small roughness perturbat
Externí odkaz:
http://arxiv.org/abs/2009.12420
We precisely and rigorously characterise the decay of elastic fields generated by dislocations in crystalline materials, focusing specifically on the role of multilattices. Concretely, we establish that the elastic field generated by a dislocation in
Externí odkaz:
http://arxiv.org/abs/1910.12269
The probability density function of the acoustic field amplitude scattered by the seafloor was measured in a rocky environment off the coast of Norway using a synthetic aperture sonar system, and is reported here in terms of the probability of false
Externí odkaz:
http://arxiv.org/abs/1901.08023
Autor:
Gruber, Jen A.1 derek.olson@nps.edu, Olson, Derek R.1
Publikováno v:
JASA Express Letters. Feb2024, Vol. 4 Issue 2, p1-8. 8p.
Autor:
Olson, Derek R.1 (AUTHOR) derek.olson@nps.edu, Geilhufe, Marc2 (AUTHOR)
Publikováno v:
IET Radar, Sonar & Navigation (Wiley-Blackwell). Nov2024, Vol. 18 Issue 11, p2044-2056. 13p.
Autor:
Olson, Derek J.
Reforms in teacher evaluation are enacted to increase student achievement. Although there is research on teacher evaluation and teacher quality, there is little that addresses effective teaching as conceptualized in Danielson’s Framework for Teachi
Externí odkaz:
http://pqdtopen.proquest.com/#viewpdf?dispub=3739205