Search Results - "Zuckerwar, Allan J"

Dual transmission model and related spectral content of the fetal heart sounds by Zahorian, Stephen A, Zuckerwar, Allan J, Karnjanadecha, Montri

“…Highlights ► A dual transmission model of fetal heart sounds is presented. ► The two modes are impact mode and acoustic mode, as defined by fetal position. ►…”
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Theory of compact nonporous windscreens for infrasonic measurements by Zuckerwar, Allan J.

“…The principle of the compact nonporous windscreen is based on the great penetrability of infrasound through matter. The windscreen performance is characterized…”
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Experimental investigation into infrasonic emissions from atmospheric turbulence by Shams, Qamar A, Zuckerwar, Allan J, Burkett, Cecil G, Weistroffer, George R, Hugo, Derek R

“…Clear air turbulence (CAT) is the leading cause of in-flight injuries and in severe cases can result in fatalities. The purpose of this work is to design and…”
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Contribution of crosstalk to the uncertainty of electrostatic actuator calibrations by Shams, Qamar A., Soto, Hector L., Zuckerwar, Allan J.

“…Crosstalk in electrostatic actuator calibrations is defined as the ratio of the microphone response to the actuator excitation voltage at a given frequency…”
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Calibration of the pressure sensitivity of microphones by a free-field method at frequencies up to 80 kHz by ZUCKENVAR, Allan J, HERRING, G. C, ELBING, Brian R

“…A free-field (FF) substitution method for calibrating the pressure sensitivity of microphones at frequencies up to 80 kHz is demonstrated with both grazing and…”
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Compact nonporous windscreen for infrasonic measurements by Shams, Qamar A., Zuckerwar, Allan J., Sealey, Bradley S.

“…Infrasonic windscreens, designed for service at frequencies below 20 Hz , were fabricated from a variety of materials having a low acoustic impedance, and…”
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Background noise in piezoresistive, electret condenser, and ceramic microphones by Zuckerwar, Allan J, Kuhn, Theodore R, Serbyn, Roman M

“…Background noise studies have been extended from air condenser microphones to piezoresistive, electret condenser, and ceramic microphones. Theoretical models…”
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Acoustics: Sound Fields and Transducers by ZUCKERWAR, ALLAN J.

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Acoustic impedance of Earth’s ground surface at infrasonic frequencies by Zuckerwar, Allan J.

“…The acoustic impedance of Earth’s ground surface is known to have a significant impact upon measurements of outdoor infrasound, e.g., sonic boom rise times…”
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Development of a piezopolymer pressure sensor for a portable fetal heart rate monitor by Zuckerwar, A.J., Pretlow, R.A., Stoughton, J.W., Baker, D.A.

“…A piezopolymer pressure sensor has been developed for service in a portable fetal heart rate monitor, which will permit an expectant mother to perform the…”
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Infrasonic emissions from aircraft wake vortices: Field installation by Shams, Qamar, Knight, Howard K., Zuckerwar, Allan J.

“…An infrasonic field installation was set up at Newport News-Williamsburg International Airport in early 2013. The system is made up of three PCB 377M06…”
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Infrasonic emissions from aircraft wake vortices: Experimental results by Zuckerwar, Allan J., Shams, Qamar, Knight, Howard K.

“…Infrasonic emissions from aircraft wake vortices were investigated at the Newport News-Williamsburg International Airport early in the year 2013. Signals…”
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Silver Medal in Engineering Acoustics by Zuckerwar, Allan J.

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Wind noise reduction in a non-porous subsurface windscreen by Zuckerwar, Allan J., Shams, Qamar A., Knight, Keith

“…Measurements of wind noise reduction were conducted on a box-shaped, subsurface windscreen made of closed cell polyurethane foam. The windscreen was installed…”
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Role of the Richardson extrapolation in the evaluation of acoustic data: Applications by Zuckerwar, Allan J.

“…Three acoustical applications of the Richardson extrapolation procedure are described, where in each case it is not possible to make a measurement at the zero…”
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Role of the Richardson extrapolation in the evaluation of acoustic data: Theory by Zuckerwar, Allan J.

“…In many acoustical applications the method of least squares is a popular method for fitting experimental data to known physical laws or empirical functions…”
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Measured 1/ f noise in the membrane motion of condenser microphones by Zuckerwar, Allan J., Ngo, Kim Chi Thi

“…An acoustic isolation vessel described previously [K. C. T. Ngo and A. J. Zuckerwar, J. Acoust. Soc. Am. 93, 2974–2980 (1993)] has been employed to investigate…”
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Response of infrasonic microphone field array to a controlled source by Shams, Qamar A, Zuckerwar, Allan J., Weistroffer, George R.

“…A field test on a three-microphone array at NASA Langley Research Center was conducted using a mobile controlled infrasonic source. A Helmholtz resonator, used…”
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Spectrum of measured infrasonic emissions from clear air turbulence by Zuckerwar, Allan J., Weistroffer, George R., Shams, Qamar A.

“…An array of three infrasonic microphones (0.2–20 Hz), operating continuously in the field at NASA Langley Research Center, on several occasions received a…”
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Frequency limitations of coupler-based calibrations of the pressure sensitivity of measurement microphones by Zuckerwar, Allan J., Shams, Qamar A.

“…Calibration of the pressure sensitivity of measurement microphones in a coupler requires by definition that the incident pressure be uniform over the surface…”
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