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 15 of 15 for “"earplugs"”.
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Approaches to understanding the cumulative effects of stressors on marine mammals.
… mammals and suggested the use of baleen whale earplugs to evaluate both stress and stressors. The objective of this dissertation is to investigate historic and current organic and inorganic contaminants within the marine ecosystem to better understand the cumulative effects of stressors on …
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Effects of Earplug Material, Insertion Depth, and Measurement Technique on Hearing Occlusion Effect
… attenuation capability of medical balloon-based earplugs was tested. Ten subjects, six male and four female, volunteered for the three separate experiments. They were subjected to the three earplug types (foam earplugs, premolded flanged earplugs, and medical balloon-based earplugs), two earplug …
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An inter-laboratory investigation of ANSI standard fitting protocols, sample size, subject and experimenter gender, and trial on the real-ear attenuation of two types of earplugs
Identical experiments were conducted between two acoustical-testing laboratories to determine the inter-laboratory differences of using two different hearing protection device (HPD) fitting procedures for testing the real-ear attenuation at threshold (REAT) of a popular vinyl foam earplug and a …
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Patient Satisfaction Related to Noise in the Coronary Care Unit
… promotion. From September to November 2014, earplugs were offered to all alert/oriented patients entering the CCU. Data were analyzed using the tracking tool for earplugs and the CCU Press Ganey scores for noises in and around the patient room.</p> <p><strong>Results </strong> A direct result …
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Effects of anechoic vs. reverberant sound-field, subject gender, and outlier dismissal on the real-ear attenuation of hearing protection devices
… In the experiment, three earmuffs and three earplugs were tested in two diffuse sound fields implemented in two different sound environments with different loudspeaker configurations. In the first case, the testing environment was reverberant, with frequency-specific reverberation time …
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Field evaluation of noise attenuation and comfort performance of earplug, earmuff, and ear canal cap hearing protectors under the ANSI S12.6- 1984 sound field standard
… when training for proper fitting was used, the earplugs significantly improved in noise protection (from 7.2 to 14.6 dB, depending on the frequency and the earplug) at frequencies of 125 - 1000, 6300, and 8000 Hz, whereas the earmuff and the ear canal cap were relatively resistant to the fitting …
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Low Frequency Finite Element Modeling of Passive Noise Attenuation in Ear Defenders
… through the use of circumaural ear defenders, earplugs or both. This thesis focuses on identifying the dominant physical phenomena, responsible for the low frequency (0 – 300 Hz) acoustic response inside the earmuffs. A large volume earcup is used with the undercut seal for the study. The …
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Finite Element Modeling and Exploration of Double Hearing Protection Systems
… The effects of radial compression preload on the earplugs are considered, and the resulting foam earplug shear material properties are input into the finite element DHP model where the effects of the updated foam material properties are observed.
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Measurement of accelerations experienced by rough stock riders: A model for examining acceleration-induced head injuries in astronauts
… Show and Rodeo. Riders were outfitted with two earplugs, one measuring tri-axial linear acceleration and the other tri-axial angular rates. On average, bareback riders experienced a statistically-significant increase in linear acceleration in the x and z axes compared with bull riders. Bareback …
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High-throughput analytical methods for persistent organic pollutants in high-lipid matrices.
… (Chapter V) of contaminant profiles in whale earplugs.
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Comparison of laboratory protocols for yielding improved estimates of hearing protection in field performance for use in standards development
… working group. In this experiment, two types of earplugs were tested, a user-molded, malleable foam plug and a pre-molded, multi-sized rubber plug. Attenuation data (obtained using a psychoacoustical real-ear-attenuation-at-threshold measurement procedure) were collected across 10 subjects who …
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An In-Field Experiment on the Effects of Hearing Protection/Enhancement Devices and Military Vehicle Noise on Auditory Localization of a Gunshot in Azimuth
… 1 and EB 15 High-Fidelity Electronic BlastPLG earplugs), in comparison to the open ear in an in-field test environment with ambient outdoor noise and in 82 dBA diesel truck noise with nine normal and four impaired hearing participants. Statistical analysis showed worse localization accuracy and …
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Laboratory investigation of in-field influences on spectral noise attenuation and comfort of insert and circumaural hearing protectors
… a popular foam cushion earmuff, two types of earplugs (user-molded foam and pre-molded, triple-flanged polymer), and an earmuff over foam earplug combination. Both attenuation and comfort data were collected from 40 naive but audiometrically normal subjects. Using a psychophysical …
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Influence of insertion/donning instruction on frequency-specific sound attenuation achieved with ear canal caps and earmuffs with implications for industrial noise application
… showed that they were much less susceptible than earplugs (from a previous study by Epps, 1984) to changes in user insertion/donning instruction technique and also not as dependent on user gender. The main effect of gender was not significant, and in general, any instruction was better than no …
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5-12 klasių mokinių žinios apie triukšmo įtaką sveikatai /
… suggested by the students against noise are earplugs and protection headphones. The main means to fight against noise are penalties for the noise, teaching people to talk quietly and promote wearing headphones. Keywords: noise, students, health, harm, environmental noise.