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 30 for “"hearing protection"”.
-
Hearing protection in mines : evaluating the Noise Clipper® custom made hearing protection device
Noise induced hearing loss has been extensively researched and commented on, yet it remains prevalent among industrial workers. The real-world attenuation properties of the Noise Clipper® custom-made hearing protection device and the comfort levels it afford are unknown. Furthermore, research in …
-
Finite Element Modeling and Exploration of Double Hearing Protection Systems
… increasing, requiring the improvement of current hearing protection devices. The improvement of passive hearing protection devices lies in examining the performance of major contributors to reduction of noise attenuation. The finite element method can be used to fully explore single hearing …
-
Adjusting retrospective noise exposure assessment for use of hearing protection devices
… because they did not properly account for use of hearing protection devices (HPD) which would result in potential misclassification. Exposure misclassification has been shown to attenuate exposure-outcomes relations. In the case of already subtle relationships such as noise and cardiovascular …
-
Evaluation of Military Hearing Protection Devices in a Simulated Aircraft Carrier Soundscape
… service members rely on to protect their hearing also convey deleterious effects on localization and situation awareness. Oftentimes, service members choose to improperly fit hearing protection, or forgo it entirely, to maintain situation awareness and better protect themselves against …
-
The effects of hearing protection on speech discrimination in differing noise spectra
… noise environments where workers utilize hearing protection devices (HPDs). A controlled empirical study was conducted to determine the effects of several independent variables on speech reception and discrimination including: l). subject's hearing configuration (unoccluded or earplug, …
-
An Ecological Approach to the Assessment and Promotion of Hearing Protection Behaviour in the Workplace
Background: Noise-induced hearing loss (NIHL) is a common debilitating occupational health problem in New Zealand and globally. In addition to the economic burden arising from compensation and rehabilitation for NIHL, quality of life is diminished. Unfortunately, interventions to prevent NIHL have …
-
The Detection of Warning Signals While Wearing Active Noise Reduction and Passive Hearing Protection Devices
… individuals wore an active noise reduction (ANR) hearing protection device (HPD), a passive HPD, or no HPD. An ANR earmuff, a passive earmuff, and a user-molded foam earplug were tested in two types of noises (pink and red) at two different noise levels (85 dBA and 100 dBA). The signal used was an …
-
Psychophysical investigation of the real-ear attenuation of hearing protection devices under different sound-field diffusivity conditions
… and international consensus standards governing hearing protection device (HPD) attenuation testing specify the use of a diffuse sound field to ensure the sound field remains uniform and random-incidence in an envelope about the subject’s head (ANSI, 1974; ANSI, 1984; British BSI 5108:1983; …
-
Evaluation of a Test Method for Assessing Horizontal Localization and Auditory Learning with Electronic Pass-through Hearing Protection
… warfighters and potential threats. However, hearing loss, acoustic trauma, or the use of hearing protection can diminish this vital ability to locate sounds in the environment accurately. The introduction of electronically modulated hearing protection and enhancement devices (HPED) is an …
-
Comparison of laboratory protocols for yielding improved estimates of hearing protection in field performance for use in standards development
Federal law requires hearing protection device (HPD) manufacturers to provide attenuation ratings for use in estimating workers’ protection levels. These ratings, which are laboratory obtained, typically overestimate the actual protection levels achieved in the workplace. This research investigated …
-
Effects of anechoic vs. reverberant sound-field, subject gender, and outlier dismissal on the real-ear attenuation of hearing protection devices
… environment on the measured attenuation of hearing protection devices (HPDs) when using a standard real-ear attenuation at threshold (REAT) protocol. In the experiment, three earmuffs and three earplugs were tested in two diffuse sound fields implemented in two different sound environments …
-
Azimuthal Localization and Detection of Vehicular Backup Alarms Under Electronic and Non-Electronic Hearing Protection Devices in Noisy and Quiet Environments
Objective assessment for the effect of hearing protectors, background noise levels, and backup alarm acoustic features on listeners' abilities to localize backup alarm signals in the horizontal dimension, as well as on their ability to detect backup alarm signals in the distance dimension, is …
-
Using signal detection theory to model the detection of warning signals in normal and hearing-impaired listeners while wearing hearing protection
… of whether or not an individual suffering from a hearing loss is capable of hearing an auditory alarm or warning is an extremely important industrial safety issue. International standard ISO 773 1—1986(E), Danger Signals for Work Places — Auditory Danger Signals, requires that any auditory alarm …
-
An In-Field Experiment on the Effects of Hearing Protection/Enhancement Devices and Military Vehicle Noise on Auditory Localization of a Gunshot in Azimuth
Noise-induced hearing loss and tinnitus are the two most prevalent service-connected disabilities for veterans receiving compensation (Department of Veterans Affairs, 2010). While it is possible to protect against noise-induced hearing damage with hearing protection devices (HPDs) and hearing …
-
Low Frequency Finite Element Modeling of Passive Noise Attenuation in Ear Defenders
… to such high noise fields, the need for better hearing protection is inevitable. Adequate hearing protection may be achieved 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 – …
-
Active noise reduction headphone measurement: Comparison of physical and psychophysical protocols and effects of microphone placement
… (ANR) headphones cannot be tested and labeled as hearing protection devices (HPDs) due to inherent limitations with the existing psychophysical headphone testing standard, real-ear attenuation at threshold (REAT). This research focused on the use of a standard, for physical, microphone-in-real-ear …
-
Repurposing Oseltamivir, a Commonly Prescribed Influenza Antiviral, for the Prevention of Noise- and Cisplatin-Induced Hearing Loss
Hearing loss affects up to 10% of people worldwide. Yet currently, there is only one FDA-approved drug for its prevention in a subgroup of cisplatin-treated pediatric patients. Here, we performed an unbiased screen of 1,300 FDA-approved drugs for protection against cisplatin-induced cell death in …
-
Spectral attenuation and wearability of circumaural hearing protectors as influenced by design attributes and work-related activity
Hearing protection devices (HPDs), a widely used countermeasure against noise-induced hearing loss, are laboratory-tested for their attenuation (noise reduction) capabilities. Unfortunately, laboratory tests overestimate the in-workplace performance of the devices, potentially leading to inadequate …
-
Head Mounted Microphone Arrays
… life. From sonar to gunshot detection systems to hearing aids, the performance of each system is enhanced when multi-sensor processing is implemented in lieu of single sensor processing. Head mounted microphone arrays have a broad spectrum of uses that follow the rigorous demands of human hearing. …
-
The Role of the Mitogen Activated Protein Kinase Pathway in Cisplatin and Noise-Induced Hearing Loss
Hearing loss is one of the most common types of disability; however, there are few ways to combat it with only one FDA-approved drug to treat any type of hearing loss. Cisplatin, a commonly used chemotherapy agent, and exposure to loud noise are two main causes of hearing loss. There are many …
Page 1 of 2