Diode: a semi-conductor or vacuum tube device which has two electrodes. It permits a current to flow from from cathode to anode only Used as a rectifier.
二极管：具有两个电极的半导体或空管。它只容电流从阴极流向阳极。可作整流器用。
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In this paper, a conformal mapping analysis of a vacuum microelectronic diode is presented, which uses an elliptic cone conductor as its cathode.