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Partial discharge phenomena sources (corona, internal and surface investigated under sinusoidal and cosine-recta having frequencies of both 0.1 Hz and 50 Hz that testing at very low frequencies can be aff issues (PD magnitudes are about 50% at 0.1 H those obtained at 50 Hz). Using sinusoida patterns are comparable with those obtained a rectangular waveforms, identification seems complicated, if not impossible.

Possibilities of manipulating the Rabi frequency and luminescence rate from degenerate-level systems as well as the velocity of self-induced transparency of multi-level media are studied using a unitary transformation. The Rabi frequency and luminescence rate of an electronic system whose ground level is degenerate and coupled to a resonant mode are found to depend on the level of the degeneracy. The velocity of multi-mode optical solitons in a multi-level medium is found to be influenced by the number of propagating resonant pulses. Physical realizations of relevant systems are proposed.

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