Definition: | net diameter of filament derived from the electromagnetic behaviour between filaments Note 1 to entry: The hysteresis loss, Qh, is given as Qh = (8/3π)fdfηJctBm for a sufficiently high AC magnetic flux density Bm to which Qh is proportional, where f is frequency, df is effective filament diameter, Jct is transport critical current density and η is volume fraction of the superconductor.
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