Frequency and Thermal Behavior of Acoustic Absorption in ε-GaSe Crystals
Sign Up to like & getrecommendations! Published in 2018 at "Russian Physics Journal"
DOI: 10.1007/s11182-018-1339-0
Abstract: The paper presents results of measuring acoustic absorption in ε-GaSe crystals. The absorption of a longitudinal wave which propagates normal to the crystal layers, quadratically depends on frequency. However, it does not depend on temperature,… read more here.
Keywords: absorption; acoustic absorption; gase crystals; frequency ... See more keywords
Investigation of the Acoustic Performance of Bagasse
Sign Up to like & getrecommendations! Published in 2020 at "Journal of materials research and technology"
DOI: 10.1016/j.jmrt.2019.11.028
Abstract: Abstract Bagasse from sugar cane waste is an important agriculture waste and the byproduct of the sugar industry. Generally, bagasse is used as a fuel for many industries which causes environmental pollution while it can… read more here.
Keywords: acoustic absorption; investigation acoustic; absorption coefficient; bagasse ... See more keywords
Epoxy foams with tunable acoustic absorption behavior
Sign Up to like & getrecommendations! Published in 2017 at "Materials Letters"
DOI: 10.1016/j.matlet.2017.02.054
Abstract: Abstract Herein, epoxy foams with tunable acoustic behavior were innovatively fabricated via non-traditional expandable microspheres. By adjusting the preparation parameters, changes in cellular structure from closed cells to partial open cells were observed, which exhibited… read more here.
Keywords: absorption; foams tunable; tunable acoustic; acoustic absorption ... See more keywords
Thin structured rigid body for acoustic absorption
Sign Up to like & getrecommendations! Published in 2017 at "Applied Physics Letters"
DOI: 10.1063/1.4974487
Abstract: We present a thin acoustic metamaterial absorber, comprised of only rigid metal and air, that gives rise to near unity absorption of airborne sound on resonance. This simple, easily fabricated, robust structure comprising a perforated… read more here.
Keywords: absorption; rigid body; structured rigid; thin structured ... See more keywords
Optimization of acoustic absorption by green walls made of foliage and substrate
Sign Up to like & getrecommendations! Published in 2017 at "Journal of the Acoustical Society of America"
DOI: 10.1121/1.4988038
Abstract: Green walls may absorb sound and contribute to noise reduction in urban areas. Recent experiments demonstrate that a foliage layer placed above a substrate layer may lead to a significant increase of acoustic absorption coefficient… read more here.
Keywords: acoustic absorption; foliage; absorption coefficient; foliage substrate ... See more keywords
An introduction to NASA’s broadband acoustic absorbers that resemble natural reeds
Sign Up to like & getrecommendations! Published in 2021 at "International Journal of Aeroacoustics"
DOI: 10.1177/1475472x211033492
Abstract: Thin, lightweight, and durable broadband acoustic absorbers capable of absorbing sounds over a wide frequency range, especially below 1000 Hz, while also surviving harsh operational conditions such as exposure to sprays of liquid and solid debris… read more here.
Keywords: introduction nasa; broadband acoustic; acoustic absorption; geometry ... See more keywords
A New Methodology Based on Cell-Wall Hole Analysis for the Structure-Acoustic Absorption Correlation on Polyurethane Foams
Sign Up to like & getrecommendations! Published in 2022 at "Polymers"
DOI: 10.3390/polym14091807
Abstract: Polyurethane foams with a hybrid structure between closed cell and open cell were fabricated and fully characterized. Sound absorption measurements were carried out in order to assess their acoustic performance at different frequency ranges. The… read more here.
Keywords: cell; structure; methodology; polyurethane foams ... See more keywords