Results 231 to 240 of about 188,504 (277)

Test Method for Impedance and Absorption of Acoustical Materials Using a Tube, Two Microphones and a Digital Frequency Analysis System

, 2008
  +11 more sources

Grazing Flow Acoustic Impedance Testing for the NASA AST Program

8th AIAA/CEAS Aeroacoustics Conference & Exhibit, 2002
Robert K. Kunze, Judith M. Gallman
openaire   +2 more sources

Acoustic Material Testing Using Impedance Tube

Sourabh Dogra, Arpan Gupta
  +4 more sources

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Seismic Acoustic Impedance Inversion Using Reweighted L1-Norm Sparse Constraint

IEEE Geoscience and Remote Sensing Letters, 2022
Sparse impedance inversion is widely applied for hydrocarbon prediction. Due to the low sparseness of traditional sparse constraints, pseudolayer and low-resolution problems still exist.
Liangsheng He, Hao Wu, Xiaotao Wen, Jiachun You   +3 more
semanticscholar   +1 more source

Broadband Electrical Impedance Matching of Transmitter Transducer for Acoustic Logging While Drilling Tool

IEEE Sensors Journal, 2022
An electrical impedance-matching network (EIMN) is proposed to achieve a broad transmitter transducer bandwidth for the acoustic logging while drilling tool.
Y. Gou, Xin Fu
semanticscholar   +1 more source

Satellite vibration isolation using periodic acoustic black hole structures with ultrawide bandgap

Journal of Vibration and Acoustics, 2022
A lightweight whole-spacecraft vibration isolation system with broadband vibration attenuation capability is of great significance to the protection of satellites during the launch phase.
Xiaofei Lyu, H. Sheng, Meng-Xin He, Qian Ding, L.H. Tang, Tianzhi Yang   +5 more
semanticscholar   +1 more source

Passive Impedance Sensing Using a SAW Resonator-Coupled Biosensor for Zero-Power Wearable Applications

IEEE Sensors Journal, 2022
A bio-sensing scheme, which acquires impedance information of a capacitive biosensor by using the reflected RF signal from a surface acoustic wave (SAW) resonator connected to the biosensor, is proposed. This technique requires no power to be supplied to
Xicai Yue, J. Kiely, R. Luxton, Boyang Chen, C. McLeod, Emanuel Manos Drakakis   +5 more
semanticscholar   +1 more source

[Measurement of changes of acoustic impedance as a test method for evaluation of pressure in the middle ear].

Il Valsalva, 1968
Walter Mozzo
openaire   +3 more sources

[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
openaire   +2 more sources

Test Method for Impedance and Absorption of Acoustical Materials by Impedance Tube Method

, 2011
openaire   +2 more sources