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impedance
bio‐electrical impedance
A Dictionary of Food and Nutrition
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2005
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© A Dictionary of Food and Nutrition 2005, originally published by Oxford University Press 2005. (Hide copyright information)
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bio‐electrical impedance (BIE) A method of measuring the proportion of fat in the body by the difference in the resistance to passage of an electric current between fat and lean tissue.
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Impedance relays. (Preventive maintenance of protective relays, part 3)
Magazine article from: Plant Engineering; 1/12/1984; ; 700+ words
; ...relatively high impedance will be seen...power line impedances are kept at...for which an impedance relay is set. Measured impedances greater than...measures any impedance falling within...sensitive for impedances having a phase...
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Impedance method application for multi-layer structure testing.(Report)
Magazine article from: American Journal of Applied Sciences; 1/1/2009; ; 700+ words
; ...method for little defect detection is impedance method (1). The elastic vibrations...frequency is the base of this method. Impedance method is used for glued junction detection...also exfoliation defect disclose (2). Impedance method is universal and suitable for...
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Electrical impedance--what lies beneath: understanding impedance unlocks a broad range of sensing capabilities.
Magazine article from: Sensors Magazine; 10/1/2005; ; 700+ words
; ...this effect using imaginary impedance values. Inductors have an impedance of j[omega]L, and capacitors...frequency of the signal. The impedances of these components combine...imaginary component of an impedance is called reactance, and...
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Impedance monitoring helpful in heart failure.(CARDIOVASCULAR MEDICINE)
Magazine article from: Internal Medicine News; 11/1/2009; ; 700+ words
; ...build-up in the chest by intrathoracic impedance is more predictive of events in heart...that the results do not suggest that impedance monitoring can replace daily weight monitoring...comparing the results of intrathoracic impedance monitoring with those attained through...
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Impedance. (One Minute Tutorial).(using your amp)
Magazine article from: Guitar Player; 7/1/2003; ; 700+ words
; If the concept of impedance just doesn't seem to...getting through is what impedance is all about. Simply...an amp with an output impedance of 8[ohm] to an 8...produce low-output impedances, which is why they generally...
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Understanding impedance measurement.
Magazine article from: EDN; 12/11/1996; ; 700+ words
; ...component, or transmission line, impedance plays a key role in determining the performance...every electrical circuit. Measurement of impedance was once a tedious task, requiring a...instruments are available that make impedance measurement accurate and repeatable...
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SPICEing up impedance profiles: using SPICE simulation tools to predict impedance.(NO MYTHS ALLOWED)
Magazine article from: Printed Circuit Design & Manufacture; 9/1/2006; ; 700+ words
; ...do power and ground planes play in the impedance of power delivery network (PDN)? These...can be run on your desktop. While the impedance of any interconnect element can be measured with an impedance analyzer and even a network analyzer...
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Overcoming impedance discontinuities in high-speed signal paths by using LVDS.(low voltage differential)
Magazine article from: EDN; 5/11/2006; ; 700+ words
; ...react worse in distributed impedance environments. Ignoring parasitic impedances and impedance discontinuities above 200...materials are a consistent impedance environment, but the distributed parasitic impedances will have a negative effect...
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 "Bulletin (Northwest Public Power Association)")
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Internal impedance of batteries--what it is and why it works. (Feature).
Magazine article from: Bulletin (Northwest Public Power Association); 9/1/2002; ; 700+ words
; ...battery capacity testing -- Enter Inter-Cell Impedance Testing. Inter-cell impedance testing is an electrical test procedure capable...and destruction of frequent capacity tests. Impedance is a calculation based on Ohm's Law, V...
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Achieving impedance control targets: the standard tolerance for characteristic impedance of a line--[+ or -] 10%--is changing fast. Use of field solvers can get Zo within [+ or -] 1%.(Impedance Control)
Magazine article from: Printed Circuit Design & Manufacture; 4/1/2004; ; 700+ words
; ...standard for the tolerance in characteristic impedance is [+ or -] 10%, but this requirement...manufacturing process. The characteristic impedance (Zo) of a transmission line is one...Once the dielectric material and target impedance value is selected, which is typically...
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Impedance Phlebography
Encyclopedia entry from: Gale Encyclopedia of Medicine, 3rd ed.
Impedance Phlebography Definition Impedance phlebography is a noninvasive test that uses electrical monitoring...vein thrombosis (blood clots or thrombophlebitis ). Purpose Impedance phlebography may be done in order to: detect blood clots lodged...
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impedance
Book article from: The Columbia Encyclopedia, Sixth Edition
...electricity that has an internal impedance to transfer maximum power to a device that also has an impedance, the two impedances must be matched. For example...the resistance of the device. Impedance matching is important in any electrical...
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acoustic impedance
Book article from: A Dictionary of Earth Sciences
acoustic impedance (Z) The product of density (ρ) and the acoustic velocity ( v ) for a given rock mass; Z = ρ v . The reflection coefficient for an interface is governed by the contrast in the acoustic impedances of the two adjacent rock masses .
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bio‐electrical impedance
Book article from: A Dictionary of Food and Nutrition
bio‐electrical impedance (BIE) A method of measuring the proportion of fat in the body by the difference in the resistance to passage of an electric current between fat and lean tissue.
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magnetotelluric prospecting
Book article from: The Oxford Companion to the Earth
...can be used to define the impedance Zxy = ...can be used to define the impedance Zyx = ...ground is heterogeneous, both impedances differ in magnitude and phase...general, the magnetotelluric impedance is a tensor whose values depend...
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