Results 121 to 130 of about 49,795 (169)
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Assessment of Cerebrovascular Hydraulic Input Impedance
IEEE Transactions on Biomedical Engineering, 1976The feasibility of measuring the individual input impedance in each primary arterial input to intracranial structures was examined in the anesthetized dog. From a Fourier analysis of experimental pressures and flows, carotid and vertebral input impedances with the corresponding components of hydraulic power were computed, giving the anterior, posterior,
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IEEE Transactions on Circuits and Systems I: Fundamental Theory and Applications, 2002
The input impedance of high-input-impedance buffers with a bootstrapped biasing circuit and supply rails may attain values much larger then it would correspond to the open-loop gain of the operational amplifier used. Similarly, the efficiency of suppression of capacitance connected to the inputs is unexpectedly high, although not that of the opamp ...
S. Lanyi, M. Pisani
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The input impedance of high-input-impedance buffers with a bootstrapped biasing circuit and supply rails may attain values much larger then it would correspond to the open-loop gain of the operational amplifier used. Similarly, the efficiency of suppression of capacitance connected to the inputs is unexpectedly high, although not that of the opamp ...
S. Lanyi, M. Pisani
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Optical Nanoantenna Input Impedance
ACS Photonics, 2016Optical nanoantennas have been studied as a means to manipulate nanoscale fields, local field enhancements, radiative rates, and emissive directional control. However, a fundamental function of antennas, the transfer of power between a coupled load and far-field radiation, has seen limited development in optical antennas owing largely to the inherent ...
Yuancheng Xu +4 more
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Input impedance of a chirostrip antenna
25th European Microwave Conference, 1995, 1995A very efficient yet rigorous method is presented for the analysis of chirostrip antennas embedded in a substrate above an infinite ground plane. The method is based on the well known spectral domain moment method and can be used for the analysis of single elements and arrays as well. The antenna is fed by a three-dimensional electric point-source.
VEGNI, Lucio, TOSCANO, ALESSANDRO
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The Effect of Input Configuration on Antenna Impedance
Journal of Applied Physics, 1950It is known that the configuration of the input driving system may be of importance to the impedance of antennas at high frequencies. In this paper, a region in the vicinity of the input is considered as a transducer between the TEM mode on the driving transmission line and the spherical nearly-TEM mode on the antenna system, and the constants of this ...
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2008 18th International Conference Radioelektronika, 2008
A circuit diagram and an equivalent circuit of high-input-impedance buffer stage with bootstrapped input biasing resistor and power supply nodes are given. The efficiencies of the bootstrapping of the input biasing resistor and the power supply nodes are simulated in the equivalent circuit.
Jan Hribik +2 more
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A circuit diagram and an equivalent circuit of high-input-impedance buffer stage with bootstrapped input biasing resistor and power supply nodes are given. The efficiencies of the bootstrapping of the input biasing resistor and the power supply nodes are simulated in the equivalent circuit.
Jan Hribik +2 more
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Input impedance of microstrip antennas
IEEE Transactions on Antennas and Propagation, 1982Using Richmond's reaction integral equation, an expression is derived for the input impedance of microstrip patch antennas excited by either a microstrip line or a coaxial probe. The effects of the finite substrate thickness, a dielectric protective cover, and associated surface waves are properly included by the use of the exact dyadic Green's ...
M. Deshpande, M. Bailey
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Parametric models for characterizing respiratory input impedance
Journal of Medical Engineering & Technology, 2008This study compares a manifold of parametric models reported in the literature with two novel parametric models for identifying human input respiratory impedance. The analysis is carried out on typical patient data obtained with the forced oscillations technique (FOT), on three sets of representative diagnosed subjects: healthy, asthma and COPD.
C, Ionescu, R, de Keyser
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Model of input impedance of a circular-loop antenna
Telecommunication Systems, 2016This paper proposes a novel model of the input impedance of a circular-loop antenna based on wave equations. A circular-loop antenna is equivalent to uniform parallel double wires with losses and a short circuit load. The characteristic impedance, the propagation coefficient and the inductance, capacitance and resistance per unit length of the uniform ...
Yan Yang 0001, Yida Zeng, Qixing Chen
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The low frequency input impedance of the renal artery
Pfl�gers Archiv European Journal of Physiology, 1971The renal artery of anesthetized dogs was perfused by a peristaltic pump with arterial blood. The pump rate could be modulated sinusoidally between 0.75 Hz and 0.0005 Hz. The frequency response of the renal arterial pressure to sinusoidal arterial flow of varying frequency and constant amplitude indicated the existence of a very slow autoregulatory ...
T, Kenner, K, Ono
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