Results 261 to 270 of about 1,265,505 (345)
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Applied Physics Letters, 2020
Acoustic impedance regulation of a neck embedded Helmholtz resonator is realized by introducing surface roughness to the neck so as to convert the initially non-perfect sound absorber to a perfect sound absorber.
Mingyu Duan +4 more
semanticscholar +1 more source
Acoustic impedance regulation of a neck embedded Helmholtz resonator is realized by introducing surface roughness to the neck so as to convert the initially non-perfect sound absorber to a perfect sound absorber.
Mingyu Duan +4 more
semanticscholar +1 more source
Shock-induced bubble collapse near solid materials: effect of acoustic impedance
Journal of Fluid Mechanics, 2020The fluid dynamics of a bubble collapsing near an elastic or viscoelastic material is coupled with the mechanical response of the material. We apply a multiphase fluid–solid coupled computational model to simulate the collapse of an air bubble in water ...
S. Cao +3 more
semanticscholar +1 more source
Tympanometry and Acoustic Impedance
Acta Oto-Laryngologica, 1977In recordings of the acoustic impedance of the middle ear (tympanometry) the change in air pressure in the ear canal will mostly influence the capacitive component of the acoustic impedance. By choosing a probe tone frequency close to the resonance frequency of the middle ear, characteristic tympanometric patterns can be demonstrated in certain middle ...
G, Lidén +3 more
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Investigative Radiology, 1969
A technique is described for measuring directly the acoustic impedance of tissue, and experimental results are reported for normal and abnormal post-mortem mammalian tissue as well as various live tissue at 5 MHz.
E C, Gregg, G L, Palagallo
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A technique is described for measuring directly the acoustic impedance of tissue, and experimental results are reported for normal and abnormal post-mortem mammalian tissue as well as various live tissue at 5 MHz.
E C, Gregg, G L, Palagallo
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Acoustic impedance measurement of tissue mimicking materials by using scanning acoustic microscopy.
Ultrasonics, 2020Tissue-mimicking materials (TMMs) play a key role in the quality assurance of ultrasound diagnostic equipment and should have acoustic properties similar to human tissues. We propose a method to quantify the acoustic properties of TMM samples through the
B. Altun +5 more
semanticscholar +1 more source
Optics Letters, 2020
Acoustic impedance sensing based on forward stimulated Brillouin scattering (FSBS) in fiber has attracted the attention of researchers in recent years. Here, we propose a novel, to the best of our knowledge, multipoint sensing scheme based on FSBS, which
Zhou Zheng +4 more
semanticscholar +1 more source
Acoustic impedance sensing based on forward stimulated Brillouin scattering (FSBS) in fiber has attracted the attention of researchers in recent years. Here, we propose a novel, to the best of our knowledge, multipoint sensing scheme based on FSBS, which
Zhou Zheng +4 more
semanticscholar +1 more source
Dynamics of acoustic impedance matching layers in contactless ultrasonic power transfer systems
Smart materials and structures (Print), 2020The acoustic impedance mismatch between transducer materials and medium in ultrasonic power transfer systems narrows the transduction bandwidth and causes losses through the back reflection of progressive pressure waves at the boundary between the ...
Marjan Bakhtiari-Nejad +2 more
semanticscholar +1 more source
Experimental study of nonlinear acoustic impedance of circular orifices.
Journal of the Acoustical Society of America, 2020The results of experimental studies of the acoustic impedance of orifices in the plate in the impedance tube, using the transfer functions method in a wide range of sound pressure levels, are presented.
A. Komkin, A. Bykov, M. Mironov
semanticscholar +1 more source
Ultra-wideband underwater acoustic transducer with a gradient impedance matching layer
, 2021In complex marine environments, high-efficiency, wideband and high-frequency transducers can improve the imaging resolution of sonar systems and there is an urgent need for the detection and identification of seafloor landforms.
Jiacong Bian +6 more
semanticscholar +1 more source
SIAM Journal on Applied Mathematics, 2008
In this work we present a new hybrid imaging technique that combines electrical impedance tomography (EIT) with acoustic tomography. The novel technique makes use of the fact that the absorbed electrical energy inside the body raises its temperature, thus leading to expansion effects.
Bastian Gebauer, Otmar Scherzer
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In this work we present a new hybrid imaging technique that combines electrical impedance tomography (EIT) with acoustic tomography. The novel technique makes use of the fact that the absorbed electrical energy inside the body raises its temperature, thus leading to expansion effects.
Bastian Gebauer, Otmar Scherzer
openaire +1 more source