Results 291 to 300 of about 314,481 (350)
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Absorption of Sound in Insulators
Physical Review, 1961The theory of sound attenuation in structurally perfect dielectric crystals is extended and applied to recent experiments on the absorption of acoustic waves in crystalline quartz at frequencies from ${10}^{9}$ cps to 2.4\ifmmode\times\else\texttimes\fi{}${10}^{10}$ cps.
Woodruff, T. O., Ehrenreich, H.
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Paramagnetic absorption of sound
Uspekhi Fizicheskih Nauk, 19611. Introduction 880 2. Resonant paramagnetic absorption of sound 881 3. Crystals containing ions of the iron group 881 4. Ions with an effective spin S' > 1/2 883 5. Effect on Ni2+ ions in an MgO crystal 885 6. Ions with effective spin S' = 1/2 886 7. Crystals containing ions of the rare earth elements 886 8.
S A Al'tshuler +2 more
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The Journal of the Acoustical Society of America, 1973
The exact solution for first order nonlinear scattering of two plane waves of sound [J. Acoust. Soc. Amer. 29, 934 0957)] showed the scattered density to be ρs = c0−2E12+12ω1−1ω2−1(cosθ+12Λ)[sin−2(12θ)]∇2W12. The singularity at θ = 0, which occurs when the primary waves are collinear, may be removed by applying to this solution the operator {1 − exp[(|∂
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The exact solution for first order nonlinear scattering of two plane waves of sound [J. Acoust. Soc. Amer. 29, 934 0957)] showed the scattered density to be ρs = c0−2E12+12ω1−1ω2−1(cosθ+12Λ)[sin−2(12θ)]∇2W12. The singularity at θ = 0, which occurs when the primary waves are collinear, may be removed by applying to this solution the operator {1 − exp[(|∂
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Simplified Measurements of Sound Absorption
Transactions of the American Institute of Electrical Engineers, 1934A modification of the tube or reflected wave method for measuring the sound absorption coefficients of acoustic and building materials over a wide frequency range is described in this paper. Modern communication equipment is used, and a high degree of reliability is obtained.
Arthur L. Albert, Tom B. Wagner
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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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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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Effects of absorption on the scattering of sound by sound
The Journal of the Acoustical Society of America, 1989The scattering of sound by sound in a lossless fluid was discussed at an earlier meeting [Berntsen et al., J. Acoust. Soc. Am. Suppl. 1 83, S4 (1988), and Darvennes and Hamilton, J. Acoust. Soc. Am. Suppl. 1 83, S4 (1988)]. Here, the effects of absorption are included.
Corinne M. Darvennes +3 more
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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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The Absorption of Sound in Air
The Journal of the Acoustical Society of America, 1953A detailed review will be presented, summarizing available data on absorption of sound in homogeneous air and its main constituents as a function of frequency, pressure, temperature, and humidity. Disagreement exists between results of the various investigators, especially when different techniques are used.
W. L. Nyborg, J. F. S. Y. Lee
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