Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 13 of 13 for “"Sound scattering"”.
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Sound scattering from fluid cylinders
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Physics, 1948.
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Sound scattering by a cylindrical vortex
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 1954.
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Sound scattering by cylinders of noncircular cross section
This thesis investigates a new method for predicting the farfield scattered pressure of a plane wave due to an infinite cylinder of noncircular cross section. Both impenetrable and penetrable :fluid boundary condi tions will be treated for several types of cross sections and for a large frequency …
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Sound scattering by cylinders of noncircular cross section
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1994.
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Broadband acoustical scattering in coastal environments: application to gelatinous organisms
… suited to broadband approaches. Physics-based sound scattering models allow us to interpret and draw quantitative observations from measurements. Such models have been developed and used to assess the biomass of many types of marine organisms of ecological significance, but we lack rigorous …
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Broadband acoustical scattering in coastal environments: application to gelatinous organisms and gas microbubbles
… suited to broadband approaches. Physics-based sound scattering models allow us to interpret and draw quantitative observations from measurements. Such models have been developed and used to assess the biomass of many types of marine organisms of ecological significance, but we lack rigorous …
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Acoustic Scattering by Gratings
This thesis considers the sound scattering by thin perforated plates, to further understand and develop analytic models for porous noise reduction metamaterials. The semi-analytic Fokas method is extended to periodic geometries, and the resulting integral equation, recognised as a generalised …
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Diel vertical migration and frontal variability of acoustic backscatter in the Balearic Sea
… to measure current velocities by measuring the sound returned by scatterers (most often zooplankton) in the water column. The volume of scatterers, or echo intensity, has been used to measure the abundance of zooplankton and characterize diel vertical migration (DVM). DVM is the mass vertical …
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Design of a high intensity ultrasound dispersion cell
… causing mechanical damage in a high power ultrasound environment, and to give recommendations for the production of an ultrasonic dispersion cell with a removable treatment vessel. The primary mechanism for causing this dispersion was cavitation: a void of air or vapour in a liquid medium that …
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Diel vertical migration and frontal variability of acoustic backscatter in the Balearic Sea
… to measure current velocities by measuring the sound returned by scatterers (most often zooplankton) in the water column. The volume of scatterers, or echo intensity, has been used to measure the abundance of zooplankton and characterize diel vertical migration (DVM). DVM is the mass vertical …
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Physically based real-time auralization of interactive virtual environments
… virtual environments describes the simulation of sound propagation inside enclosures where methods of Geometrical Acoustics are mostly applied for a high-quality synthesis of aural stimuli that go along with a certain realistic behavior. Here, best results are achieved by combining deterministic …
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Ecosystem impacts of variable recruitment in Antarctic krill investigated with long-term monitoring and archived ADCP backscatter data
… information on the distribution and density of sound-scattering objects. Therefore, in regions where the primary sound-scattering objects are zooplankton, the ADCP can be used to map zooplankton distribution. I explore whether archived data (2005-2018) from an ADCP on Palmer LTER sampling …
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Broadband acoustic characterization of the deep scattering layer
Sound-scattering layers are found throughout the global ocean at depths between 200 and 1000 meters, referred to as the deep scattering layers (DSLs). DSLs are biological in nature, primarily formed by organisms such as zooplankton and mesopelagic fish, many of which undertake diel vertical …