Results 171 to 180 of about 2,103,194 (320)

An Investigation of Bifurcation Acoustic Treatment Effects on Aft-Fan Engine Nacelle Noise [PDF]

Increasing air traffic and more stringent aircraft noise regulations continue to expand requirements on aircraft noise reduction capabilities for conventional and unconventional aircraft configurations.
Jones, Michael G., Nark, Douglas M.
core   +1 more source

Applications of diffraction theory to aeroacoustics [PDF]

A review is given of the fundamentals of diffraction theory and the application of the theory to several problems of aircraft noise generation, propagation, and measurement.
Chen-Huei, L., Lansing, D. L., Norum, T. D.   +2 more
core   +1 more source

Residential green is associated with reduced annoyance to road traffic and railway noise but increased annoyance to aircraft noise exposure.

Environment International, 2020
B. Schäffer, M. Brink, Felix Schlatter, D. Vienneau, J. Wunderli   +4 more
semanticscholar   +1 more source

Effects of complex soundscapes on the occurrence of Anaxipha pallidula in isolated green spaces in Tokyo

Wildlife Biology, EarlyView.
Urban green spaces experience a mix of natural and anthropogenic noises, which could disrupt the vocal communication of several species. This study investigated how such complex soundscapes affect the occurrence of Anaxipha pallidula, which communicates through calls, focusing on both sound level and quality.
Hiroki Mori, Takeshi Osawa
wiley   +1 more source

Associations between Aircraft Noise Exposure and Self-Reported Sleep Duration and Quality in the United States-Based Prospective Nurses' Health Study Cohort. [PDF]

Environ Health Perspect, 2023
Bozigar M, Huang T, Redline S, Hart JE, Grady ST, Nguyen DD, James P, Nicholas B, Levy JI, Laden F, Peters JL.   +10 more
europepmc   +1 more source

Comparison of predicted engine core noise with current and proposed aircraft noise certification requirements [PDF]

Predicted engine core noise levels are compared with measured total aircraft noise levels and with current and proposed federal noise certification requirements. Comparisons are made at the FAR-36 measuring stations and include consideration of both full-
Groesbeck, D. E., Vonglahn, U. H.
core   +1 more source

Evaluating machine learning models for multi‐species wildlife detection and identification on remote sensed nadir imagery in South African savanna

Wildlife Biology, EarlyView.
This research paper investigates the efficacy of leading machine learning (ML) models for detecting and identifying ungulate species in African savanna using nadir imagery from unmanned aerial vehicles (UAVs). Traditional aerial counting methods, while widely used, suffer from significant limitations in accuracy and precision, in part due to human ...
Paul Allin, Fadel Seydou, Radloff Frans, Andrew Davies, Alison Leslie   +4 more
wiley   +1 more source

Sociodemographic Patterns of Exposure to Civil Aircraft Noise in the United States. [PDF]

Environ Health Perspect, 2022
Simon MC, Hart JE, Levy JI, VoPham T, Malwitz A, Nguyen D, Bozigar M, Cupples LA, James P, Laden F, Peters JL.   +10 more
europepmc   +1 more source

Inlet technology for powered-lift aircraft [PDF]

The concepts, analytical tools, and experimental data available for designing inlets for powered lift aircraft are discussed. It is shown that inlets can be designed to meet noise, distortion, and cruise drag requirements at the flight and engine ...
Luidens, R. W.
core   +1 more source

Estimating red deer Cervus elaphus population density using drones in a steep and rugged terrain

Wildlife Biology, EarlyView.
Precise and accurate information about population density, crucial for wildlife management, is difficult to obtain for elusive species living in dense forests or steep and inaccessible terrain. Using unmanned aerial vehicles (UAVs), we developed a method for obtaining absolute population estimates of ungulates living in steep, rugged, and partly ...
Julie Bommerlund, Torbjørn Ergon, Simon Filhol, Atle Mysterud   +3 more
wiley   +1 more source