Results 111 to 120 of about 49,795 (169)

Acoustic Input Impedance of the Human Ear

Acta Oto-Laryngologica, 1966
An objective method of measuring the vibrations of the tympanic membrane by means of an improved capacitive-probe system is described. The device has a dynamic range up to 7500 A over the whole audiofrequency range. A new probe tip was developed, serving for conduction of the modulated H.F. signal as well as for the sound transmission.
H, Fischler, M, Hohenberger, E H, Frei, M, Rubinstein, D, Kretzer   +4 more
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INPUT IMPEDANCE OF THE CANINE VERTEBRAL ARTERY

Quarterly Journal of Experimental Physiology, 1987
In experiments on six anaesthetized dogs it was found that the vertebral artery contributed 69·2 ± 1·7% of cerebral and 41·5 ± 2·5% of cephalic flow. The input characteristics were that the vertebral artery had a flow of 0·71 ± 0·05 ml.s−1 into an input impedance of 23·7 ± 1·9 GN.m−5.s.
D E, Taylor, E S, Tukmachi
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A parametric study of cochlear input impedance

The Journal of the Acoustical Society of America, 1991
In this paper various aspects of the cat cochlear input impedance Zc(ω) are implemented using a transmission line model having perilymph viscosity and a varying cross-sectional scalae area. These model results are then compared to the experimental results of Lynch et al. [J. Acoust. Soc. Am. 72, 108–130 (1982)].
S, Puria, J B, Allen
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Arterial Input Impedance

2010
Impedance is the relation between the pressure difference and flow of a linear system, for sinusoidal or oscillatory signals. Impedance completely describes the system and it can be derived from pulsatile pressure difference and pulsatile flow and the application of Fourier analysis.
Nicolaas Westerhof, Nikolaos Stergiopulos, Mark I. M. Noble   +2 more
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Aortic input impedance in infants and children

Journal of Applied Physiology, 2000
Flow and pressure measurements were performed in the ascending aortas of six pediatric patients ranging in age from 1 to 4 yr and in weight from 7.2 to 16.4 kg. From these measurements, input impedance was calculated. It was found that total vascular resistance decreased with increasing patient weight and was approximately one to three times higher ...
M K, Sharp, G M, Pantalos, L, Minich, L Y, Tani, E C, McGough, J A, Hawkins   +5 more
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Amplifier input impedances for myoelectric control

Medical & Biological Engineering & Computing, 1986
Normal requirements for differential and common-mode input impedance of amplifiers for biological signals are reviewed. It is shown that these are not sufficient for satisfactory performance of amplifiers in myoelectric control applications, where accidental opening of the input circuit through electrode movement must not make the system susceptible to
R N, Scott, D F, Lovely
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Measurement of aortic input impedance in rats

American Journal of Physiology-Heart and Circulatory Physiology, 1994
Measurement of aortic input impedance in the rat is complicated by a high basal heart rate but is possible if appropriate compensation is made for frequency-dependent errors in modulus and phase resulting from analog filters in the equipment and from nonalignment of pressure and flow sensors.
G F, Mitchell, M A, Pfeffer, N, Westerhof, J M, Pfeffer   +3 more
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Adjustable Input Impedance Dipole

2021 IEEE 19th International Symposium on Antenna Technology and Applied Electromagnetics (ANTEM), 2021
In this paper, a novel dipole design with an adjustable input impedance is presented. The proposed dipole is designed to have additional arms attached at the edges of the feeding gap for the purpose of controlling the input impedance. Varying the dimensions of the two arms enables the tuning of the input impedance.
Melad M. Olaimat, T. Tang, Omar M. Ramahi   +2 more
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Input impedance and output impedance of feedback amplifiers

IEE Proceedings - Circuits, Devices and Systems, 1996
A simple and precise method is given for calculating the input and output impedances of a feedback amplifier, directly from its loop gain. A useful approximation to the precise result is that the input or output impedance is equal to the source or load impedance for which loop gain would equal unity.
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Input impedance of dipole

2015 XXth IEEE International Seminar/Workshop on Direct and Inverse Problems of Electromagnetic and Acoustic Wave Theory (DIPED), 2015
Integra-differential equation of Leontovich-Levin played a great role in the development of a theory of thin linear antennas. It is characterized by strict formulation of a problem and by possibilities of evolution of its solution procedure [1]. Analysis of the results obtained by using this equation allows us to clarify separate questions of the ...
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