Results 341 to 350 of about 2,739,977 (397)
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On the sound absorption in ferrodielectrics
Physics Letters A, 1977Abstract The damping of the sound waves in ferromagnets due to the phonon-magnon interaction is considered for the temperature θ c ( μM 0 4 7θ c ) 4 7 ⪡ T ⪡ θ 2 D 4 7θ c and frequency τ−1m-ph ⪡ ω ⪡ τ−1m ranges.
O.A. Olkhov, S.P. Semin, V. S. Lutovinov
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The Absorption of Sound in Cellular Foams
Noise Control and Acoustics, 2004Porous materials are often used as sound absorbers in a variety of situations including architectural and industrial applications. In many cases it is advantageous for the material to be both lightweight and rigid. Metal foams, originally developed for use in catalytic converters in car exhaust systems, offer an attractive mix of properties being both ...
Dupère, Iain D J +2 more
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Coiled-up structure with porous material lining for enhanced sound absorption
International Journal of Mechanical Sciences, 2023Weitao Zhang, F. Xin
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The Journal of the Acoustical Society of America, 1970
Recent analyses of both laboratory and field measurements of the absorption of sound in moist air have indicated an absorption at low frequencies considerably in excess of that predicted for the vibrational relaxation in oxygen and classical processes.
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Recent analyses of both laboratory and field measurements of the absorption of sound in moist air have indicated an absorption at low frequencies considerably in excess of that predicted for the vibrational relaxation in oxygen and classical processes.
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Sound absorption of space-coiled metamaterials with soft walls
International Journal of Mechanical Sciences, 2023Ping You Sun +6 more
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The Journal of the Acoustical Society of America, 1977
Sound attenuation is usually obtained by means of absorbing materials. This technique, which works quite well for sounds of medium and high frequencies, is very inefficient at low frequencies, because the thickness of absorbing material necessary to produce a constant attenuation increases with decreasing frequency.
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Sound attenuation is usually obtained by means of absorbing materials. This technique, which works quite well for sounds of medium and high frequencies, is very inefficient at low frequencies, because the thickness of absorbing material necessary to produce a constant attenuation increases with decreasing frequency.
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Absorption of Sound by Vortex Filaments
Physical Review Letters, 1994The effect of an acoustic wave packet falling onto a thin 3D filament of vorticity is identified and analyzed. The wavelength of sound decreases to zero in a finite time in such a process. Therefore, even if viscosity is small the wave packets will reach the scales of strong viscous dissipation and get absorbed, transferring their energy to the thermal
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Ceramic Material for Sound Absorption
Noise & Vibration Worldwide, 2015The acoustic correction of large places for low frequency components can be obtained by inserting acoustic resonators. This paper reports the realization and the experimental verification of acoustic resonators obtained with ceramic material. The sound absorption is obtained by drilling the specimens of ceramic material with a hole size of 2 mm and 5 ...
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