Results 251 to 260 of about 73,095 (305)

Causality and Characteristic Impedance

54th ARFTG Conference Digest, 2000
A new causal power-normalized waveguide equivalent-circuit theory fixes both the magnitude and phase of the characteristic impedance of a waveguide.
Dylan F. Williams, Bradley K. Alpert
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Characteristics of a simple measure of respiratory impedance

Respiration Physiology, 1987
The ratio of mouth pressure developed 0.1 sec after occlusion at end-expiration (P0.1) to average inspiratory flow rate (VT/TI) has been proposed as 'effective inspiratory impedance', Imeff. We have studied a simple mathematical model of lung mechanics, consisting of an effective resistance, an effective compliance and a single pressure generator, to ...
W E, Fordyce, R M, Whetstone
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Experimental modelling of biomechanical impedance characteristics

Medical & Biological Engineering & Computing, 1986
New experimental modelling of biomechanical impedance is proposed. The parameters which express the impedance characteristics are simply determined by impedance measurement. Audiofrequencies below about 1000 Hz and comparatively lower preloads (below about 6370 kg m−2) are chosen as the research domain.
T, Yamamoto, H, Oka
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Characteristics of impedance properties of metallic bioelectrodes

Bulletin of Experimental Biology and Medicine, 1979
Dependence of interelectrode impedance on the metal type, electrode area of processing its working surface and current frequency was investigated. A series of 15 materials according to their impedance characteristics were obtained and a relationship between a sequence of preparations of heavy metals according to the density of albuminates they produced
R Kh, Tukshaitov, R L, Garifullin
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Impedance characteristics of calcareous deposit

Chinese Journal of Oceanology and Limnology, 1996
The electrochemical impedance spectra for bare steel and sample covered with calcareous deposit in artificial seawater were determined; the dependence of the impedance on the potential was investigated; the significance of the impedance parameter Rf reflecting the effective protectiveness of the deposit is emphasized.
Wen Guo-mou, Zheng Fu-yang, Fang Bing-fu, Ma Ting-chun   +3 more
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Microstrip Characteristic Impedance

IEEE Transactions on Microwave Theory and Techniques, 1979
A recent paper by Bianco et al. gives five definitions of microstrip characteristic impedance which do not have the same frequency dependence. This paper shows that the most widely used definition can be based on wave-impedance and is a unique unambiguous characteristic impedance for microstrip, consistent with characteristic impedance definitions of ...
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Study of Frequency Characteristics of Communication Line Impedance

The 2nd International Conference on Computing and Data Science, 2021
With the rapid development of communication technology in China, it is a great challenge to use communication lines to transmit information. The "skin effect" of transmission current caused by the impedance characteristics of the lines leads to the reduction of transmission effect of wires.
Nan Ding, Hanxiang Cheng
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Impedance Characteristics of Hydraulic Orifices

Proceedings of the Institution of Mechanical Engineers, Part I: Journal of Systems and Control Engineering, 1995
The impedance characteristics of cylindrical and sharp-edged hydraulic orifices under non-zero mean flow conditions have been investigated through experimental measurement and computational fluid dynamics (CFD) simulation studies. Based upon these investigations a generic model of the impedance characteristics of orifices has been developed. This model
K K Lau, K A Edge, D N Johnston
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Characteristic impedance of unbalanced TDR probes

IEEE Transactions on Instrumentation and Measurement, 2002
Time domain reflectometry (TDR) may be used to make simultaneous measurements of both dielectric constant and conductivity by means of a probe inserted into the medium. The air-spaced characteristic impedance of the probe is required in order to estimate the conductivity from the final value of the TDR waveform. Unbalanced probes derived from a coaxial
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The calculation of the characteristic impedance of microstrip

International Journal of Electronics, 1976
Results from calculations of Zc of microstrip from a formula proposed by Kumar etal.are discussed and compared with other theoretical and practical results.
Gunn M.W., Mar L.
openaire   +3 more sources