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.
Results
Showing 1 to 20 of 23 for “"Underwater sound"”.
-
Underwater sound puluse generator
Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1996.
-
A low frequency underwater sound propagation model
All wave-theoretic underwater sound propagation models attempt to derive the acoustic field originating from a sound source in a specific environment by either solving the wave equation directly or by solving an approximation there-of. This dissertation describes a normal mode direct solution with …
-
An underwater sound system used for accurate positioning.
Massachusetts Institute of Technology. Dept. of Electrical Engineering. Thesis. 1966. M.S.
-
Underwater sound propagation and acoustic communication in a time-varying shallow estuarine environment
… and other coastal engineering activities. Underwater acoustic technology offers a series of effective applications and technical supports for real-time monitoring and long-term preservation of the nature environment and ecosystem in these regions. However, estuaries are shallow waters with …
-
Implications to underwater sound transmission of inhomogeneities in the mixed layer of the ocean
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Meteorology, 1962.
-
Underwater sound radiation from single large raindrops at terminal velocity: the effects of a sloped water surface at impact
… oscillating bubbles that radiate significant underwater sound energy. Those studies identified two diameter ranges that produce bubbles: small drops (.8-1.1 mm diameter) which produce bubbles by one mechanism and large drops (2.2-4.6 mm diameter) which create bubbles by a different mechanism. …
-
Geographic Variations of Sound Channel Axis in the Global Ocean
Sound signals are used for imaging and communication in the ocean. Underwater sound speed has a minimum at a certain depth that forms a sound channel for long-range underwater sound propagation. The geographic variation of sound channel is crucial in uses of underwater sound in various environments …
-
Estimating the upper ocean vertical temperature structure from surface temperature as applied to the southern Benguela
Underwater Sound Velocity Profiles (SVP) are used throughout the world by their respective navies for submarine and surface vessel strategic operations and exercises. Together with the sonar equations, the sound velocity profiles are of paramount importance to solve underwater sound detectability …
-
Modeling and Monitoring of Otolith Organ Performance in US Navy Operating Environments
… on vestibular damage due to low frequency sound. Divers exposed to high-intensity underwater sound have experienced symptoms attributed to vestibular stimulation. An in-water video-oculography (VOG) system was developed to monitor divers' eye movements, particularly torsional, during …
-
Underwater acoustic signal behavior prediction in the region of Kauai Island
Behavior of underwater sound propagation over long-ranges has been studied for several decades. The purpose of this is to describe sound propagation phenomena in various ocean environments. The key to understanding and visualizing is mathematical modeling. In the ocean acoustics community, four …
-
Behavioral Responses of Rainbow Smelt to Sensory Deterrent Systems
… study were: 1) to test the effectiveness of an underwater sound projector array (SPA) and (2) strobe lights as fish deterrents for avoidance and acclimation behavior of rainbow smelt; 3) to determine physical characteristics that affect light attenuation in Lake Oahe; and 4) to evaluate …
-
An efficient multi-layer boundary element method for direct computation of sound propagation in shallow water environments
… (3D) direct simulation capabilities for underwater sound field predictions in shallow water environments. Despite the large number of theoretical and experimental studies, direct numerical simulation of the shallow water acoustic field is still challenging due to environmental …
-
Efficient inversion methods in underwater acoustics
… and implemented for source localization and sound speed and bottom depth estimation using sound propagation in the ocean. The proposed inversion techniques are based on the linearization of the generally non-linear inverse problem of parameter estimation in underwater acoustics. These …
-
Lorentz actuators for turbulence control and underwater acoustic communications
… contributions are the turbulence control and underwater acoustic communication fields. The ability to control turbulence is directly associated with controlling drag. Shipping industries and naval institutions are constantly seeking ways to reduce drag on marine vessels. A reduction in drag …
-
The Role of Backreef Soundscapes and their Spatial Structure for Recruitment of Tropical Marine Larvae
<p>Underwater sound is a cue used by many marine larvae to orient to coastal habitats including backreef, sponge-dominated hardbottom habitat in the Florida Keys (Florida, USA) – a particularly “noisy” coastal habitat. However, the distance over which acoustic cues are attractive to …
-
The auditory system of the minke whale (Balaenoptera acutorostrata) : a potential fatty sound reception pathway in a mysticete cetacean
… developed based on how baleen whales receive sound. However, sound reception pathways in baleen whales are currently unknown. This thesis presents an integrative approach to understanding hearing in baleen whales through dissections, biomedical imaging, biochemical analyses, and modeling sound …
-
Spatial capture-recapture for acoustic surveys
… as SCR oversimplifies the detection process for underwater sound propagation. The applications involve data collected by sonobuoys and hydrophones. In light of the oversimplification of the detection process, the inference made with SCR was comparable to other models and previous studies. Lastly, …
-
Inner ear morphology in elasmobranchs: implications for auditory capacity and ecology
… the first vertebrates to evolve the capacity for sound detection, and their auditory system is part of the impressive array of sensory systems they possess. However, relatively little is known about the elasmobranch auditory system and its importance compared to other sensory systems within and …
-
The auditory system of the minke whale (Balaenoptera acutorostrata) : a potential fatty sound reception pathway in a mysticete cetacean
… developed based on how baleen whales receive sound. However, sound reception pathways in baleen whales are currently unknown. This thesis presents an integrative approach to understanding hearing in baleen whales through dissections, biomedical imaging, biochemical analyses, and modeling sound …
Page 1 of 2