Purpose: This paper reports the results of a comprehensive noise survey of the Sikorsky S-70A-9 Black Hawk helicopter environment and provides an assessment of the hearing protection devices worn by Australian Army personnel exposed to that environment.
Methods And Results: At-ear noise levels were measured at 4 positions in the cabin of the Black Hawk under various flight conditions and at 13 positions outside the Black Hawk under various ground running conditions using the Head Acoustic Measurement System (Head, GmbH). The attenuation properties of the hearing protection devices (HPDs) normally worn by aircrew and maintenance crews (the ALPHA helmet and the Roanwell MX-2507 Communications headset) were also assessed. At-ear sound pressure levels that would be experienced by personnel wearing their normal HPDs were determined at the positions they would normally occupy in and around the aircraft.
Conclusion: Results indicate that HPDs do not provide adequate hearing protection to meet current hearing conservation regulations which allow a permissible noise exposure of 85 dB(A) for an 8-h day.
Download full-text PDF |
Source |
|---|
Publication Analysis
Top Keywords
Similar Publications
Trends in the Epidemiology of Deep Vein Thrombosis and Pulmonary Embolism in Patients Undergoing Surgery.
Cureus
December 2024
Orthopaedics, University of Central Florida, Orlando, USA.
Objective This study aims to utilize the TriNetX database, a comprehensive global network, to improve our understanding of the frequency, demographic factors, and related comorbidities of surgical patients who develop venous thromboembolism (VTEs) events. Methods The global collaborative network in TriNetX was queried for all cases from January 1, 2017, through December 31, 2023. International Classification for Disease (ICD) diagnosis codes were used to define patient cohorts with deep vein thrombosis (DVT) of the upper or lower extremity or pulmonary embolism (PE).
View Article and Find Full Text PDFInterpretable diagnostic system for multiocular diseases based on hybrid meta-heuristic feature selection.
Comput Biol Med
January 2025
Automatic Control Department, Universitat Politècnica de Catalunya-BarcelonaTech, 08034, Barcelona, Spain; Institut de Recerca Sant Joan de Dèu (IRSJD), 08950, Barcelona, Spain.
Age-related Macular Degeneration (AMD), Cataract, Diabetic Retinopathy (DR) and Glaucoma are the four most common ocular conditions that affect a person's vision. Early detection in the asymptomatic stages can alleviate vision loss or slow down the progression of these diseases. However, manual diagnosis is a costly and tedious process, especially in mass screening applications.
View Article and Find Full Text PDFUtilizing nontargeted metabolomics integrated with quality component quantitation via differential analysis to reveal the taste differences between and metabolite characteristics of hawk black tea and hawk white tea.
Food Res Int
December 2024
Department of Tea Science, Sichuan Agricultural University, Chengdu 611130, China; Tea Refining and Innovation Key Laboratory of Sichuan Province, Sichuan Agricultural University, Chengdu 611130, China. Electronic address:
This study conducted a comprehensive analysis of the differences in the taste characteristics of hawk black tea and hawk white tea, exploring the intrinsic relationship between nonvolatile metabolites and these taste characteristics. The results revealed significant differences in taste properties of the two types of hawk tea. Hawk black tea mainly exhibits a fresh, sweet, and sweet aftertaste quality, whereas hawk white tea offers a mellow and pure taste.
View Article and Find Full Text PDFIntegrative taxonomy reveals two new species of Nicoll, 1907 (Digenea: Microphallidae Ward, 1901), parasitizing birds in the Gulf of Mexico.
J Helminthol
October 2024
Departamento de Zoología, Instituto de Biología, Universidad Nacional Autónoma de México, Ciudad Universitaria C. P. 04510, Ciudad de México, Mexico.
Members of the genus Nicoll, 1907 include endoparasites of aquatic birds and mammals, distributed worldwide. Adult specimens were collected from the intestines of three bird species (the great black hawks, Gmelin; laughing gull, Linnaeus; and the willet, Gmelin) in three localities along the Gulf of Mexico. were sequenced for the large subunit (LSU) from nuclear rDNA, and the new sequences were aligned with other microphalloid sequences available in GenBank.
View Article and Find Full Text PDFEnhancing cognitive performance prediction by white matter hyperintensity connectivity assessment.
Brain
December 2024
Department of Neurology, University Medical Center Hamburg-Eppendorf, Hamburg 20251Germany.
Article Synopsis
- White matter hyperintensities (WMH) are linked to cognitive impairment but solely measuring their volume doesn't fully explain the cognitive deficits.
- Lesion network mapping (LNM) offers a new way to assess how WMH connects with brain networks, potentially improving our understanding of their impact on cognition.
- In a study of 3,485 patients, LNM scores outperformed WMH volumes in predicting cognitive performance, especially in attention, processing speed, and verbal memory, but not for language functions.
Want AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!