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Wegel, in 1921, was the first to express these equations in terms of mechanical impedance as well as electrical impedance.

The element formula_2 is the open circuit mechanical impedance, that is, the impedance presented by the mechanical side of the transducer when no current is entering the electrical side.

The element formula_3, conversely, is the clamped electrical impedance, that is, the impedance presented to the electrical side when the mechanical side is clamped and prevented from moving (velocity is zero).

Another method is bioelectrical impedance analysis (BIA), which uses the resistance of electrical flow through the body to estimate body fat.

Matthaei, George L. Young, Leo Jones, E. M. T. Microwave Filters, Impedance Matching Networks, and Coupling Structures , New York McGraw Hill 1964 .

A number of methods are available for determining body fat percentage, such as measurement with calipers or through the use of bioelectrical impedance analysis.

Circuit diagrams produced using this analogy match the electrical impedance of the mechanical system seen by the electrical circuit, making it intuitive from an electrical engineering standpoint.

In contrast with clinical tools, one relatively inexpensive type of body fat meter uses the principle of bioelectrical impedance analysis (BIA) in order to determine an individual's body fat percentage.

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For the chest, the technique was developed by NASA to measure the split second impedance changes within the chest, as the heart beats, to calculate both cardiac output and lung water content.

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You try and think of a different way of saying the same thing, or if you know the particular student and that student's cognitive style, then you might say it in a way that you think would have a good impedance match with that student.

The reflection coefficient can be calculated using formula_2, where formula_3 is the reflection coefficient (0 denotes full transmission, 1 full reflection, and 0.5 is a reflection of half the incoming voltage), formula_4 and formula_5 are the impedance of the first component (from which the wave enters) and the second component, respectively.