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, the thickness of the base must be much less than the diffusion length of the electrons. the collector–base junction is reverse-biased, and so negligible electron injection occurs from the collector to the base, but carriers that are injected into the base and diffuse to reach the collector-base depletion...
transfer from the flame to the melt charge can occur in two ways: directly from the flame to the charge and indirectly from the flame to the refractory walls of the furnace, and then from refractory walls to the charge. in a rotary furnace, the rotation enables the hot re- fractory to pass under the metal...