Results 331 to 340 of about 1,129,305 (370)
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Acoustic impedance of rectangular panels
Journal of Sound and Vibration, 1979Abstract The modal radiation impedance of a rectangular panel simply supported in an infinite baffle in the presence of an inviscid, uniform, subsonic flow is determined. The analysis is based on an expansion in normal modes of the transverse vibration displacement field of the panel and the use of wavenumber-frequency transforms.
Patrick Leehey, Y.M. Chang
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IUS, 2019
Although high-frequency (≥ 100 MHz) ultrasound has demonstrated its capability in a variety of applications, the fabrication of high frequency ultrasonic transducers with both high sensitivity and broad bandwidth remains challenging.
Xinyu Yang +6 more
semanticscholar +1 more source
Although high-frequency (≥ 100 MHz) ultrasound has demonstrated its capability in a variety of applications, the fabrication of high frequency ultrasonic transducers with both high sensitivity and broad bandwidth remains challenging.
Xinyu Yang +6 more
semanticscholar +1 more source
Acoustic impedance of the maternal abdomen
The Journal of the Acoustical Society of America, 1993Contact sensors to monitor fetal heart, breathing, and movement sounds with increased sensitivity and bandwidth are under development. To understand the inherent acoustical properties of the maternal abdomen and its interaction with these sensors, the driving-point impedance Z(jω) was measured in nine women during their last trimester of pregnancy.
George R. Wodicka +3 more
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Lab on a Chip, 2018
Label-free isolation of CTCs from blood is critical for the development of diagnostic and prognostic tools for cancer. Here, we report a label-free method based on acoustic impedance contrast for the isolation of CTCs from peripheral blood mononuclear ...
S. Karthick +3 more
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Label-free isolation of CTCs from blood is critical for the development of diagnostic and prognostic tools for cancer. Here, we report a label-free method based on acoustic impedance contrast for the isolation of CTCs from peripheral blood mononuclear ...
S. Karthick +3 more
semanticscholar +1 more source
A Method of Measuring Acoustic Impedance
The Journal of the Acoustical Society of America, 1932An apparatus s described whereby acoustic impedances may be measured in terms of a known acoustic impedance and the complex ratios of two electrical potentiometer readings to a third. As a known impedance, there is chosen the reactance of a closed tube of uniform bore which is an eighth wave-length long.
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Measurement of Acoustic Impedance
The Journal of the Acoustical Society of America, 1949In this paper a method is described of measuring the acoustic impedance of a sample of material forming one boundary of a shallow cylindrical cavity, by determining the sound pressure produced when a known volume current is injected into the cavity from a high impedance source. The volume current is effectively determined by observing the pressure when
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Acoustical impedance measurement.
The Journal of the Acoustical Society of America, 2008Many components of specialty transducers have extremely tight acoustic impedance tolerances and become difficult to measure in a production environment. Comparing the device to the acoustical impedance of a cavity is one method of determining its acoustical impedance. A precise method of determining the acoustical impedance is described.
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Acoustic Impedance Study of Peritubal Myoclonus
Acta Oto-Laryngologica, 2002An audible clicking sound coexistent with the contractions of the peritubal muscles is thought to be an isolated form of palatal myoclonus that presents with myoclonal contractions of the soft palate, larynx, pharynx and, sometimes, cervicofacial area.
Yetiser, S., Kazkayasi, M., Civitci, D.
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Acoustical Impedance of Enclosures
The Journal of the Acoustical Society of America, 1947Formulas are derived for the acoustical impedance of three types of enclosures, a sphere, a cylinder, and a narrow rectangular box. The solutions are valid throughout the entire range from adiabatic to isothermal conditions.
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Tonndorf and acoustic impedance
The Journal of the Acoustical Society of America, 1990Juergen was full of ideas that reflected his excellent understanding of the limits of technology and science. At first many of his ideas seemed impractical, but in my experience, he was usually right on target and got the results or data he was after. I learned many practice things from him in the lab; almost every encounter brought a new point of view
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