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 ?
Although not tested, the same behavior as unreinforced thermoplastics regarding the critical frequency is also expected for the short glass reinforced materials.
Depending on the material and stress level, temperature rise can be stabilized at a maximum critical frequency.
These procedures were lactate minimum, critical frequency and anaerobic threshold tests.
2008b) Validity of critical frequency test for measuring table tennis aerobic endurance through specific protocol.
Replacing the values from table 1 in the relation (3) the critical frequency can be obtained 82 Hz.
At frequencies less than the critical frequency the transmission loss is obtained using the relations (4) and (5), and for frequency much higher than the critical frequency, the transmission loss is obtained by adapting relation (6) with the following equation:
10 yields for the critical frequency exponent the value.
The AC electrical conductivity of the PC/PCL-MWCNT nanocomposites is frequency independent up to a certain frequency region and then increased after that frequency region which is well known as critical frequency ([f.
Critical frequency test (critf): All the athletes performed three or four trials (separated by at least 2 hours and no more than 2 exercises per day) on a table tennis table.
Key words: Anaerobic capacity, table tennis, critical frequency, Wingate test, lactate.
The critical frequency in the maximum hydration state is [10.
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