Results 141 to 150 of about 147,257 (198)

Frequency spectra of cochlear acoustic emissions (’’Kemp-echoes’’)

The Journal of the Acoustical Society of America, 1981
Cochlear acoustic emissions were recorded with a sensitive microphone from within the ear canal of normal hearing subjects. Frequency spectra of these acoustic emissions were obtained with two different procedures: real-time recording or calculation of the spectrum of time-averaged emissions.
Wit, H.P., Langevoort, J.C., Ritsma, R.J.   +2 more
openaire   +4 more sources

Acoustic cavitation noise spectra

Applied Scientific Research, 1982
Experiments are described which allow to measure and visualize the dynamics of the total acoustic cavitation noise spectrum. A distinct threshold for broad-band noise much higher than the threshold for the first subharmonic has been found. At this noise threshold a broadening of all spectral lines is observed.
E. Cramer, W. Lauterborn
openaire   +1 more source

Acoustical Phonon Spectra of Biological Polymers

Nature, 1966
ALTHOUGH much has been done in an attempt to understand the kinetics of biological processes in terms of their molecular motions1–4, it appears that until now no one has attempted to calculate or measure the proper (normal) modes of motion of helical biological polymers.
W L, Peticolas, M W, Dowley
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Acoustic phonon spectra of FeCl2

Solid State Communications, 1974
Abstract The acoustic phonon dispersion curves for FeCl2 at room temperature have been measured by inelastic neutron scattering. The slope of the TA (ζ00) e ‖ z branch, 1650 m sec , is found to be close to that proposed by Laurence and Petitgrand (1500 m sec ) to explain the drop in the low temperature thermal conductivity due to ...
W.B. Yelon, R. Scherm, C. Vettier
openaire   +1 more source

Waveform and Frequency Spectra of Acoustic Emissions

The Journal of the Acoustical Society of America, 1971
Stress waves generated internally by deforming materials provide information about the operative deformation mechanisms. These stress waves are known as acoustic emissions. Acoustic emission stands alongside conventional ultrasonic methods as a useful technique of nondestructive testing.
R. W. B. Stephens, A. A. Pollock
openaire   +1 more source

Interlaboratory comparisons of acoustic emission spectra

NDT International, 1980
Abstract A procedure has been developed whereby acoustic emission frequency spectra can be corrected for the variable effects of specimen geometry, couplant, and transducer characteristics. The results of several experiments on 7039 Al show that quantitative agreement can be obtained between laboratories for the spectral shapes and amplitudes of ...
S.J. Acquaviva, D. Birchon, J.M. Carlyle, J.G. Faller, L.J. Graham, S.D. Hart, S.L. McBride, I.G. Scott, D.E.W. Stone, H.H. Vanderveldt   +9 more
openaire   +1 more source

Acoustic Spectra from Turbulent Jets

The Journal of the Acoustical Society of America, 1971
One of the interesting and important problems involving turbulent jets is that of determining the spectrum of the radiated sound. This has proved to be a difficult theoretical problem because the space-time correlation of the velocity is central in the prediction of such sound characteristics.
openaire   +1 more source

Information Content of Acoustic Attenuation Spectra

Particle & Particle Systems Characterization, 2002
In recent years ultrasonic attenuation spectroscopy has gained much attention as a method for the characterisation of concentrated dispersions. Several publications have shown, that this method allows the accurate determination of particle size. In particular for submicron dispersions there is, however, some uncertainty to which degree the details of a
Frank Babick, Siegfried Ripperger
openaire   +1 more source

Electromagnetic and Acoustic Emission Fine Spectra

Advanced Materials Research, 2006
A new measuring method for the detection of fine spectra of electromagnetic and acoustic emission (EME and AE) signals from small cracks is described. It requires wide band ultra-low noise amplifiers, analogue filters, the optimization of signal to noise ratio of sensors and the application of noise elimination methods.
Josef Sikula, J. Majzner, P. Sedlak, Yasuhiko Mori   +3 more
openaire   +1 more source