Results 341 to 350 of about 2,706,203 (393)
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A scalable high-porosity wood for sound absorption and thermal insulation
Nature Sustainability, 2023Xinpeng Zhao +21 more
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The Journal of the Acoustical Society of America, 1999
A sound absorption structure which is mainly applied to an intake system of an automotive engine for suppressing noise level. The sound absorption structure comprises a base duct portion, and an extended duct portion in which a sound absorption material is installed, and a Helmholtz resonator.
Kyoichi Watanabe, Kouichi Nemoto
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A sound absorption structure which is mainly applied to an intake system of an automotive engine for suppressing noise level. The sound absorption structure comprises a base duct portion, and an extended duct portion in which a sound absorption material is installed, and a Helmholtz resonator.
Kyoichi Watanabe, Kouichi Nemoto
openaire +2 more sources
Absorption of sound in sea water
Ultrasonics, 1963Laboratory and field data on the absorption of sound in sea- water are reviewed in the light of modern theory, including effects of pressure, temperature and salinity. The effects of temperature and MgSO4 salt concentration appear to be compatible from one investigator to another.
M. Schulkin, H.W. Marsh
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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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Sound absorption polyimide composite aerogels for ancient architectures’ protection
Advanced Composites and Hybrid Materials, 2023Xingyu Zhao +5 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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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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Absorption of sound in the Martian atmosphere
The Journal of the Acoustical Society of America, 2001Future missions to the planet Mars might include microphones to listen for sounds in the tenuous Martian atmosphere. The chemical composition of the atmosphere is well established by previous missions and ground based observations. The dominant constituent is CO2 with a minor amount of N2 and Argon and smaller amounts of H2O.
James P. Chambers, Henry E. Bass
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The Journal of the Acoustical Society of America, 1977
An equation for sound absorption in Lyman and Fleming sea water (S= 35‰, pH=8) is presented as a function of frequency. temperature, and pressure. It represents the contributions to absorption due to boric acid, magnesium sulfate, and water. The pressure effect on sound absorption by magnesium sulfate is treated in more detail than Schulkia and March ...
F. H. Fisher, V. P. Simmons
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An equation for sound absorption in Lyman and Fleming sea water (S= 35‰, pH=8) is presented as a function of frequency. temperature, and pressure. It represents the contributions to absorption due to boric acid, magnesium sulfate, and water. The pressure effect on sound absorption by magnesium sulfate is treated in more detail than Schulkia and March ...
F. H. Fisher, V. P. Simmons
openaire +2 more sources
Sound absorption of space-coiled metamaterials with soft walls
International Journal of Mechanical Sciences, 2023Ping You Sun +6 more
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