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 6 of 6 for “"noise absorption"”.
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Adaptive Collocated Feedback for Noise Absorption in Acoustic Enclosures
… control for low frequency acoustic energy absorption in acoustic enclosures. The specific application chosen for this work is the reduction of high interior sound pressure levels (SPL) experienced during launch within launch vehicle payload fairings. Two acoustic enclosures are used in the …
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Feasibility study of a hybrid passive/active noise absorption system
… development of a compact hybrid Passive/Active noise absorption system that would be effective over a wide frequency range. The Passive/Active system efficiently integrates both passive and active noise control methods. Both theoretical and experimental investigations were carried out in this …
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Auroral radio absorption : modelling and prediction
… for enhanced high frequency radiowave absorption in the high latitude ionosphere. Measuring the propagation of radio waves through the ionosphere has been utilised for investigating particle precipitation into the upper atmosphere. Although various methods and models previously proposed …
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Integrated computational and experimental framework for the assessment of railroad ballast life-cycle behavior
… stability, and providing track resilience and noise absorption. Throughout its service life, ballast goes through changes in gradation and aggregate particle shape properties. These changes affect the particulate nature of ballast layer behavior, which has not been thoroughly understood from …
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Fabrication and Evaluation of Specialty Nonwoven Materials
… materials with high performance on chemical absorption, adsorption and on acoustic absorption and insulation using natural fiber nonwovens via carbonization and activation. Evaluation of these textile materials includes tensile strength, thermogravimetric analysis, sound absorption and …
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Effects of solar particle events on Geospace
… latitude depression, substorms and polar cap absorption. The energetic proton populations of three selected SEP events from 2001 are used as 'tracers' to quantify the compression of the geomagnetic cavity during storm conditions. Empirical relations between the cutoff latitude and the ring …