Results 131 to 140 of about 3,850 (165)
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Foam acoustic absorption member
The Journal of the Acoustical Society of America, 1988A foam acoustic absorption member having a stabilizing layer with perforations and, in order to obtain a simple, stable structural shape of homogeneous resistance to flow, the stabilizing layer (2) is a wide-side wall of a hollow body (K) which wall is pressed, under thermal deformation, against the foam layer (1), the openings in said hollow body ...
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Acoustic Absorption in Sand and Soil
The Journal of the Acoustical Society of America, 1948The acoustic absorption properties of sand and soil with varying amounts of water, ranging from dry to saturated, have been investigated. In most of the work the frequency range was 10–30 kc, although data were obtained at as high as 150 kc. Two methods were used.
W. L. Nyborg, I. Rudnick
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Mechanism of Acoustic Absorption in Tissue
The Journal of the Acoustical Society of America, 1952A viscous mechanism for the absorption of ultrasonic energy in tissue is considered. It is shown that the viscous forces acting between a suitably chosen distribution of suspended particles or structure elements and a suspending liquid can account for the experimentally observed linear relations between acoustic absorption coefficient and ultrasonic ...
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Acoustic absorption properties of materials
Construction and Building Materials, 1988Abstract The sound absorption characteristics of some 30 different but easily available sound absorbing materials have been studied previously. Presented here in brief are a selection of these materials, their description, methodology used and results obtained.
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Phononic glass: A robust acoustic-absorption material
The Journal of the Acoustical Society of America, 2012In order to achieve strong wide band acoustic absorption under high hydrostatic pressure, an interpenetrating network structure is introduced into the locally resonant phononic crystal to fabricate a type of phononic composite material called “phononic glass.” Underwater acoustic absorption coefficient measurements show that the material owns high ...
Heng, Jiang, Yuren, Wang
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Absorption of acoustic waves by sunspots
Solar Physics, 1992Observations of the scattering of acoustic waves by sunspots show a substantial deficit in scattered power relative to incident power. A number of calculations have attempted to model this process in terms of absorption at the magnetohydrodynamic Alfven resonance.
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Acoustic absorption in amorphous silicate down to 1 K
Il Nuovo Cimento B Series 11, 1976The acoustic absorption in amorphous silica was measured between 1 K and 20 K and at frequencies between 15 and 65 MHz. It was shown that in the range (3÷5) K there exists an absorption peak whose position is temperature dependent, thus indicating a thermally activated relaxation process.
Ballaro' S. +4 more
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A Small Acoustical Tube for Measuring Absorption of Acoustical Materials in Auditoriums
The Journal of the Acoustical Society of America, 1946A small acoustical tube is described, which is suitable for measuring absorption coefficients of acoustical materials over a limited frequency range. This instrument is useful for checking the acoustical characteristics of materials after they have been applied to the walls of theaters, studio review rooms, and other auditoriums.
D. P. Loye, R. L. Morgan
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Nonresonant acoustic absorption of Ising magnet
Theoretical and Mathematical Physics, 1994Zubarev's nonequilibrium statistical operator method is used to construct a theory of the nonresonant acoustic absorption of the linear Ising magnet, the basic Hamiltonian of which is of the two-particle kind and is treated without approximations. The frequency dependence of the absorption is determined and found to differ analytically from the well ...
I. S. Donskaya +2 more
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Sound Absorption Coefficients and Acoustic Impedance
The Journal of the Acoustical Society of America, 1941The relation between normal acoustic impedance and the various types of absorption coefficient has been discussed and specific formulas for the coefficients in terms of acoustic impedance have been published. Contours of constant absorption coefficient plotted as a function of the real and imaginary parts of acoustic impedance plotted on a linear scale
Richard L. Brown, Philip M. Morse
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