Results 311 to 320 of about 440,511 (349)

[350m heliox saturated diving test--dynamic observation on hearing threshold, brainstem evoked response and acoustic impedance].

Zhonghua er bi yan hou ke za zhi, 1991
Four divers were investigated simulating a diving of 350m with saturated heliox under compression, performed in Jan 1989 at Navy Medical Institute. Changes in hearing threshold, brainstem evoked response and acoustic impedance were observed. The 4 divers experienced no tinnitus, hard of hearing and earache during compression and decompression ...
L Wang
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Test Method for Impedance and Absorption of Acoustical Materials by Impedance Tube Method

, 2011
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Comparative Study of Impedance Eduction Methods, Part 2: NASA Tests and Methodology

, 2013
A number of methods have been developed at NASA Langley Center for eduction of the acoustic impedance of sound-absorbing liners mounted in the wall of a flow duct.
Michael G. Jones, W. R. Watson, B. M. Howerton, S. Busse-Gerstengarbe   +3 more
semanticscholar   +2 more sources

Structure-constrained relative acoustic impedance using stratigraphic coordinates

, 2015
Acoustic impedance inversion involves conversion of seismic traces to a reflection coefficient time series and then into acoustic impedance. The usual assumption for the transformation of poststack seismic data into impedance is that seismic traces can ...
Parvaneh Karimi
semanticscholar   +1 more source

OS0717 Ultrasonic Testing Using Powder Coupling with Adjustable Acoustic Impedance

The Proceedings of the Materials and Mechanics Conference, 2012
Kazuya Mori, Kenji Hashimoto, Kazuhisa Era   +2 more
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Empirical model of the acoustic impedance of a circular orifice in grazing mean flow.

Journal of the Acoustical Society of America, 2003
Although there are many analytical and empirical models for orifice impedance, the predicted acoustical performance when adopting any one of them sometimes shows a large discrepancy with the measured result in some cases.
Seong-Hyun Lee, J. Ih
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Test Method for Impedance and Absorption of Acoustical Materials Using a Tube, Two Microphones and a Digital Frequency Analysis System

, 2010
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Acoustic impedance and tympanometry with the retarded: a normative study.

Audiology, 1972
Acoustic impedance and tympanometry data were obtained from 100 institutionalized mentally retarded children representing a broad range of ages, etiological classifications, and measured intelligence levels.
R. T. Fulton, L. E. Lamb
semanticscholar   +1 more source

Measurement of the acoustic impedance of an orifice under a turbulent boundary layer

, 1976
The acoustic impedance of an orifice under a turbulent boundary layer was measured. A single orifice, 0.508 cm in diameter and 0.32 cm thick, was tested in a wind tunnel where the velocity was varied from 16 to 30 m/sec.
A. Goldman, R. Panton
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Measurements of the acoustic input impedance of cat ears: 10 Hz to 20 kHz.

Journal of the Acoustical Society of America, 1994
The acoustic input impedence of the ear is a useful measure of the behavior of the middle ear and of its effect on the acoustics of the external ear.
Thomas J. Lynch, W. T. Peake, J. Rosowski   +2 more
semanticscholar   +1 more source