Proceedings of Meetings on Acoustics
نویسنده
چکیده
As the sand grain size approaches the acoustic wavelength, the underwater backscattering strength increases. Laboratory measurements show that the shallow-grazing angle backscattering strength increases as the third power of the normalized grain diameter, until it reaches a saturation level. In this regime, it has been shown that the attenuation of the sound in the sand increases as the fourth power of frequency and the speed of sound decreases with increasing frequency. The most likely explanation for the attenuation and speed dispersion is multiple scattering [Schwartz and Plona, Journal of Applied Physics, vol. 55, 1984, and Kimura, J. Acoust. Soc. Am. EL, vol. 129, 2011]. The multiple scattering model is applied to the backscattering process, and it is shown to be consistent with the published backscattering data. [Work supported by the Office of Naval Research, Ocean Acoustics Program].
منابع مشابه
Some simulations of the effect of varying excitation parameters on the transients of reed instruments
Fabrice Silva, Vincent Debut, Philippe Guillemain, Jean Kergomard, Christophe Vergez. Some simulations of the effect of varying excitation parameters on the transients of reed instruments. 21st International Congress on Acoustics (ICA 2013), Jun 2013, Montréal, Canada. Proceedings of Meetings on Acoustics, Proceedings of Meetings on Acoustics, Vol. 19, 035058 (2013), pp.4aMU4, 2013, Internation...
متن کاملIncorporating measurement standards for sound power in an advanced acoustics laboratory course
متن کامل
The role of phonological alternation in speech production: evidence from Mandarin tone sandhi.
We investigate the role of phonological alternation during speech production in Mandarin using implicit priming, a paradigm in which participants respond faster to words in sets that are phonologically homogeneous than in sets that are phonologically heterogeneous. We test whether priming is obtained when words in a set share the same tones at the underlying level but have different tones at th...
متن کامل