Results 41 to 50 of about 147,257 (198)

On wavenumber spectra for sound within subsonic jets

, 2014
This paper clarifies the nature of sound spectra within subsonic jets. Three problems, of increasing complexity, are presented. Firstly, a point source is placed in a two-dimensional plug flow and the sound field is obtained analytically.
Agarwal, A., Sandberg, R. D., Sinayoko, S.   +2 more
core   +1 more source

Analysis of Acoustic Spectra Reflecting Ion Transport Processes in Glassy Electrolytes

Advances in Electrical and Electronic Engineering, 2004
The investigation of acoustic spectra in ion conductive glasses wiht different composition can reflect the basic features of the relaxation and transport processes of the mobile ions.
Peter Hockicko, Peter Bury, Stanislav Jurecka, Miroslav Jamnicky, Igor Jamnicky   +4 more
doaj  

Characterizing wind-dependent low-frequency ambient sound with ocean observatories initiative hydrophones [PDF]

JASA Express Letters
This study characterizes the statistical dependence of low-frequency ambient sound on wind speed using 8 years of Ocean Observatories Initiative hydrophone data.
John Ragland, Shima Abadi
doaj   +1 more source

Unifying the low-temperature photoluminescence spectra of carbon nanotubes: the role of acoustic phonon confinement [PDF]

, 2014
At low temperature the photoluminescence of single-wall carbon nanotubes show a large variety of spectral profiles ranging from ultra narrow lines in suspended nanotubes to broad and asymmetrical line-shapes that puzzle the current interpretation in ...
Cassabois, Guillaume, Chassagneux, Yannick, Diederichs, Carole, Ferreira, Robson, Lauret, Jean-Sébastien, Roquelet, Cyrielle, Roussignol, Philippe, Vialla, Fabien, Voisin, Christophe   +8 more
core   +3 more sources

Application of the frequency analysis of acoustic emission in the study of the metal alloy solidification

Archives of Acoustics, 2000
A frequency analysis of the acoustic emission signals was applied for the investigation of the solidification of a Pb-Sb alloy. Spectra of continuous emission and short-time acoustic emission impulses were investigated.
M. GOLEC, Z. GOLEC
doaj  

Method for extracting ship shaft rate features by fusing acoustic and magnetic field

Scientific Reports
To address the challenge of detecting small underwater targets, this paper proposes a detection method based on the fusion of acoustic and magnetic fields.
Taotao Xie, Qing Ji, Peng Yu, Jiawei Zhang   +3 more
doaj   +1 more source

Newly identified properties of surface acoustic power [PDF]

, 2010
The cause of enhanced acoustic power surrounding active regions, the acoustic halo, is not as yet understood. We explore the properties of the enhanced acoustic power observed near disk center from 21 to 27 January 2002, including AR 9787.
A.C. Donea, B.W. Hindman, C. Lindsey, C.G. Toner, D. C. Braun, D. Kuridze, D.C. Braun, D.C. Braun, E. Khomenko, E. Khomenko, H. Schunker, K. Muglach, K. Muglach, K.V. Parchevsky, L. Gizon, L. Jacoutot, M. Rempel, O.V. Ladenkov, P.H. Scherrer, R. Cameron, R. Jain, S. Couvidat, S. Shelyag, S.M. Hanasoge, S.M. Hanasoge, T. Sakurai, T. Wiegelmann, T.M. Brown, W. Finsterle   +28 more
core   +2 more sources

Acoustic resonance spectra of a finite cylindrical shell [PDF]

The Journal of the Acoustical Society of America, 1988
Previous studies have explained acoustic scattering from an infinite cylinder or a sphere. The scattering depends strongly on resonances that are related to the propagation of circumferential waves when the acoustic axis is perpendicular to the cylinder axis or the propagation of guided waves when the insonification is oblique.
G. Maze, F. Lecroq, J. L. Izbicki, J. Ripoche   +3 more
openaire   +1 more source

Adaptive Narrowband Compensation Algorithm for Active Control of the Pressure Pulsation Line Spectrum in A Liquid Pipeline System

Shock and Vibration
Active noise control technology provides a means for actively controlling pipeline pulsations. The control signal emitted by the secondary source feeds back into the reference input signal, thereby generating a pulsation coupling phenomenon.
Qichao Liu, Wenjing Yu, Guo Cheng
doaj   +1 more source

Effects of impurities on particle sizing by acoustic attenuation spectroscopy [PDF]

, 2010
It is important to have correct information regarding particle size in order to interpret, control, and optimize many industrial processes. Prior to the recent advent of acoustic attenuation spectroscopy, it was difficult to study particle size ...
Frances, Christine, Inam, Muhammad Asif
core   +2 more sources