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 20 of 200 for “"acoustical"”.
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Factors influencing acoustical localization
… can be used by the auditory system to localize acoustical sound sources. At first, a measurement setup (TASP-System) is presented and validated in this theesis, that is capable of measuring HRTFs with a high spatial resolution and that can also be used for psychacoustic localization …
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Acoustical characterization of glacierized fjords
The rapidly changing cryosphere motivates a better understanding of the physical processes governing ice-ocean boundaries. These processes are no more pronounced than in glacierized fjords where massive glaciers meet the ocean. This underwater acoustic environment is significantly louder than other …
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Acoustical analyses of chicken vocalizations
Vocalizations of the domestic chicken were recorded and analyzed by quantitative and qualitative methods in two experiments. In Experiment 1, recordings were made from males and females from two lines of White Leghorn chickens housed in individual battery cages. Five call types: crow, disturbance …
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OPTIMIZATION OF A PIEZOELECTRIC ACOUSTICAL COMPRESSOR
A one-dimensional, axisymmetric, linear finite element model describing a fluid interacting with a piezoelectric actuator is developed. This system is used to generate finite amplitude standing waves in an acoustic cavity with rigid walls. The model includes the effects of viscous and thermal …
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Acoustical imaging using wave propagation tomography
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1993.
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Acoustical characteristics of oil palm mesocarp fibres
… technology. Therefore, this study discusses the acoustical characteristics of agro-waste biomass fibres from oil palm Mesocarp as fibrous acoustic material. Incorporated polyurethane (PU) had improved the sound absorption coefficient (SAC), especially at low frequency range. The oil palm Mesocarp …
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Acoustical-molecular techniques for magnetic resonance imaging
… level in the form of a novel contrast mechanism, Acoustically Induced Rotary Saturation (AIRS), which switches "on" and "off" the image contrast due to the agents by adjusting the resonance of the spin-lock condition. This contrast modulation ability provides unprecedented clarity in identifying …
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Flow generated noise of acoustical duct liners.
Thesis. 1977. M.S.--Massachusetts Institute of Technology. Dept. of Aeronautics and Astronautics.
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Simultaneous structural/acoustical design of composite panels
… of airborne noise thereby requiring heavier acoustical treatments. A sequential design approach of addressing first structural and then acoustical design does not take advantage of structural/acoustical coupling. A simultaneous approach is expected to help minimize the total sidewall mass. …
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Acoustical reverberation level modeling of underwater riverine system
Sonars used to count migrating salmon in the Pacific Northwest must operate in a complicated and variable acoustic environment. This paper discusses the acoustic properties which affect the performance of salmon enumeration methods. The methods used must be able to take into account variable site …
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Passive energy management in acoustical and dynamical systems
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2024-09-16 without embargo terms
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Acoustical wave propagation in buried water filled pipes
… comprehensive way of dealing with the problem of acoustical wave propagation in cylindrically layered media with a specific application in water-filled underground pipes. The problem is studied in two stages: First the pipe is considered to be very stiff in relation to the contained fluid and then …
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Objective audiological diagnostics using novel acoustical and electrophysiological tests
In dieser Arbeit werden verschiedene akustische und elektrophysiologische Methoden zur audiologischen Diagnostik untersucht. Die verwendeten Methoden beziehen höhere Stufen der auditorischen Verarbeitung mit ein und erlauben daher Aussagen über den Zustand des Gehörs bis zu einer neuronalen Ebene. …
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Broadband acoustical scattering in coastal environments: application to gelatinous organisms
Broadband acoustical technology revolutionized our ability to explore, monitor, and operate in the ocean. While strides have been made in numerous physical and biological applications, there remain many standing scientific questions well suited to broadband approaches. Physics-based sound …
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Acoustical characterization and parameter optimization of polymeric noise control materials
… automotive and consumer industries have certain acoustical characteristics that vary in function of the stiffness and density of the selected material. The validity and applicability of existing theory is explored, and since STL is influenced by factors such as the surface mass density of the …
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The Effect of Nonlinear Propagation on Near-field Acoustical Holography
<p>Near-field acoustical holography (NAH) has been used extensively for acoustical imaging of infinitesimal-amplitude (or small-amplitude) sources. However, recent interests are in the application of NAH to image finite-amplitude (or high-amplitude) sources such as jets and rockets. Since NAH is …
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Anechoic chamber design and acoustical analysis of room 1-051
Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1987.
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Acoustical study of the development of stop consonants in children
This study focuses on the acoustic patterns of stop consonants and adjacent vowels as they develop in young children (ages 2;6-3;3) over a six month period. Speech is generated using a series of articulatory, laryngeal, and respiratory gestures that children must learn to reproduce. As a child's …
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The acoustical transmission response of an ocean bottom sedimentary layer.
Massachusetts Institute of Technology. Dept. of Geology and Geophysics. Thesis. 1966. M.S.
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