Results 351 to 360 of about 2,706,203 (393)
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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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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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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 GAS MIXTURES
The Journal of the Acoustical Society of America, 1953The absorption of sound has been measured in CO2, CS2, C2H4O, and in mixtures of the latter two gases with CO2 for frequencies ranging from 2 to 10 kc and for pressures ranging from 3 to 300 mm of Hg. The tube method was employed. The absorption was determined by observing the decrease in sound pressure as the path length between the speaker and the ...
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1976
One of the important aspects of the dynamics of magnets is the sound propagation near the critical point. A number of theories have been developed for the case of ultrasonic attenuation at magnetic phase transitions (see for instance the paper by B. Luthi, T.J. Moran and R.J. Pollina [1] and references quoted there).
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One of the important aspects of the dynamics of magnets is the sound propagation near the critical point. A number of theories have been developed for the case of ultrasonic attenuation at magnetic phase transitions (see for instance the paper by B. Luthi, T.J. Moran and R.J. Pollina [1] and references quoted there).
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Tunable acoustic composite metasurface based porous material for broadband sound absorption
Composite structures, 2022Tianyue Yuan +6 more
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On the sound absorption by openings in rooms (L)
The Journal of the Acoustical Society of America, 2012Sound absorption by openings has been rarely considered in room acoustics. In fact, information about small openings (such as ventilation grids) may sometimes be found, but nothing is said about larger openings, possibly as a consequence of the less likely occurrence in a design. In order to fill this gap, measurements were carried out in scale models,
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Low frequency sound absorption of adjustable membrane-type acoustic metamaterials
Applied Acoustics, 2022Tuo Xing +6 more
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