“arc”的概念、定义、翻译、参考文献-科学参考

arc

Astronomy

A part of a circle. Angular measure is given in units of arc. See Degree of Arc; Minute of Arc; Second of Arc; Radian.

Statistics

Electronics and Electrical Engineering

A luminous electric discharge in a gas with a characteristically high current density and low potential gradient. An arc occurs (is struck) when the gas along its path becomes a plasma. The arc is drawn from a localized spot on the cathode, resulting in heating of the cathode. Thermionic emission occurs with a resultant drop in potential across the tube. Arc-discharge tubes can therefore carry very large currents at voltage drops of tens of volts only. See also gas-discharge tube.

Geology and Earth Sciences

单词	arc
释义	arc Astronomy A part of a circle. Angular measure is given in units of arc. See Degree of Arc; Minute of Arc; Second of Arc; Radian. Statistics See graph; network. Electronics and Electrical Engineering A luminous electric discharge in a gas with a characteristically high current density and low potential gradient. An arc occurs (is struck) when the gas along its path becomes a plasma. The arc is drawn from a localized spot on the cathode, resulting in heating of the cathode. Thermionic emission occurs with a resultant drop in potential across the tube. Arc-discharge tubes can therefore carry very large currents at voltage drops of tens of volts only. See also gas-discharge tube. Geology and Earth Sciences See island arc.
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