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A 141 has recently been discussed by Bowe. 11 According to this interpretation for intermediate E/po values generally >0.1 but <1.0 V/cmXTorr where the average electron energy is many times the value of kT, the functional relationship between the drift velocity and E/po is determined by the momentum transfer cross section for elastic collisions. If in this region the cross section does not decrease with energy, then the drift velocity varies with E/po less than the power unity.With increasing E/po, a critical E/po value is reached corresponding to the onset of inelastic collisions. As a result of the inelastic collisions tending to stabilize the random energy, a linear relationship between the drift velocity and E/po is initially observed above the critical E/po value. From Fig. 4, according to this interpre-11 J. C. Bowe, Phys. Rev. 134, A355 (1964).

Vacuum high-pressure die casting uses a vacuum pump to evacuate the air and gases from the die casting die cavity and metal delivery system before and during the injection of molten metal. This article describes the conventional die casting, vacuum die casting, and high-pressure die casting processes.

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