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Distinct gastroesophageal reflux characteristics in preterm-born infants fed human milk versus formula: insights for clinical practice on outcomes. [PDF]
J PerinatolOsborn EK +4 more
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Acoustic impedance measurements of pulse tube refrigerators
Journal of Applied Physics, 2010Complex acoustic impedance is determined in a prototype refrigerator that can mimic orifice-type, inertance-type, and double inlet-type pulse tube refrigerators from simultaneous measurements of pressure and velocity oscillations at the cold end. The impedance measurements revealed the means by which the oscillatory flow condition in the basic pulse ...
Takashi Iwase +2 more
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The three-microphone impedance tube
The Journal of the Acoustical Society of America, 1988The two-microphone impedance tube technique introduced by Seybert and Ross, and Chung and Blaser, is now widely used and has recently been standardized by the ASTM. This standard does not account for the effects of wall attenuation on measurement accuracy.
J. S. Bolton, M. Kompella
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The Journal of the Acoustical Society of America, 1963
A lightweight impedance tube has been developed primarily as an instrument for practical research. It can be used also for precision measurements of acoustical-impedance and sound-absorption coefficients in both laboratory and field installations, over the frequency range 400 to 900 cps.
Raymond D. Berendt, Henry A. Schmidt
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A lightweight impedance tube has been developed primarily as an instrument for practical research. It can be used also for precision measurements of acoustical-impedance and sound-absorption coefficients in both laboratory and field installations, over the frequency range 400 to 900 cps.
Raymond D. Berendt, Henry A. Schmidt
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Simple Impedance Test for Eustachian Tube Function
Archives of Otolaryngology - Head and Neck Surgery, 1981A simple impedance method to evaluate Eustachian tube function has been reported. The principle of the test consists of recording the impedance of the eardrum during Valsalva's maneuver and during swallowing. By this procedure, the inflow and outflow of air through the tube is recorded as a simple pattern of impedance change that is classified into the
I, Honjo, T, Kumazawa, K, Honda
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A high-impedance, cold-cathode triger tube
IRE Transactions on Electron Devices, 1956The tube to be described is a cold-cathode, gas-filled tetrode which triggers on extremely low signals. It was developed by the Raytheon Manufacturing Company in cooperation with the Diamond Ordnance Fuze Laboratories. Under pre-firing conditions, the tube passes a very small Townsend current of about 10-9amp. On application of a firing signal, current
M.J. Reddan, P. Stutsman, N. Spencer
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Acoustic Impedance of Rectangular Tubes
The Journal of the Acoustical Society of America, 1953An expression for the acoustic impedance of a section of infinite parallel planes is derived. Measured values of the impedance of long narrow rectangular tubes show good agreement with this theory when an appropriate end correction is used. The theory compares favorably with impedance measurements on short rectangular tubes or slits even when the ...
John K. Wood, George B. Thurston
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