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Definition of electrical aging. (a) Variation of electron emission current at a higher emission regime with time; (b) the section at which Joule heating occurs sufficiently; (c) the section at which Joule heating is reduced; (d) the section at which Joule heating disappears completely; (e) the section at which Joule heating reappears; (f) the section at which Joule heating increases; (g) excessive Joule heating that can cause damage to the CNT emitters.
