critical frequency


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critical frequency

[′krid·ə·kəl ′frē·kwən·sē]
(electronics)
(electromagnetism)
The limiting frequency below which a radio wave will be reflected by an ionospheric layer at vertical incidence at a given time.
(geophysics)
The minimum frequency of a vertically directed radio wave which will penetrate a particular layer in the ionosphere; for example, all vertical radio waves with frequencies greater than the E-layer critical frequency will pass through the E layer. Also known as penetration frequency.
References in periodicals archive ?
The critical frequency test can be used for measuring table tennis aerobic endurance through specific protocol.
The critical frequency test (critf) (critical power model adapted for table tennis) was used to determine anaerobic work capacity (AWC) in a table tennis specific test; and Wingate tests were used in both cycle ([W.
2 that the unaged sample at RT shows a QDC process, which may be represented by Eqs 11 and 12, with the critical frequency [[omega].
Depending on the material and the stress level, the specimen surface temperature rise can be stabilized at a maximum frequency referred to as critical frequency.
2] layer is calculated with respect to measured ordinary critical frequency as given in the expression, equation (3) postulated by Anderson and Matsushita in 1974 (Robert and Andrew, 2004; Barclay, 2003).
The authors concluded that the model proposed for determination of the critical frequency of mechanical launcher ball shots is reproducible and that the cardiac frequency does not show intensity sensitivity in the work range of the test protocol.
These findings were reinforced in a recent study by Zagatto and Gobatto (2012) where no significant correlation was found between W' from a critical frequency test with the maximal accumulated oxygen deficit (MAOD), which is considered the gold standard test when assessing anaerobic capacity.
2), it may be shown that, for normal incidence, the critical frequency is given by
At a frequency rate lower than the critical frequency ([f.
The effect reveals that as you turn up the critical frequency of a bacterium or other pathogen it appears to have a seizure.
By using SSCG, the company asserts EMI can be reduced by up to 15dB in the critical frequency bands deterministically, thereby reducing engineering iterations.

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