| 释义 |
heteropolar, a.|ˌhɛtərəʊˈpəʊlə(r)|
[f. hetero- + polar a.]
1. Bot. Having polar correspondence to something different from itself; having dissimilar poles, as in the figures called Stauraxonia heteropola (Encyl. Brit. XVI. 844).
2. Electr. Of an electric generator or its operation: using armature conductors that pass alternate north and south magnetic poles, so that the current generated is periodically reversed. Cf. homopolar a. 2.
1896S. P. Thompson Dynamo-Electric Machinery (ed. 5) 475 In cases where it [sc. a conductor] passes from being opposite a N-pole to being opposite a S-pole, the operation is said to be heteropolar. 1946Nature 28 Sept. 455/1 For the majority of applications the modern heteropolar inductor alternator is the most suitable machine.
3. Chem. [a. G. heteropolar (R. Abegg 1906, in Zeitschr. f. anorg. Chem. L. 309).] Formed by ions of opposite sign, between which there is electrostatic attraction. Cf. homopolar a. 3.
1922[see homœopolar adj. s.v. homœo-]. 1930Engineering 5 Dec. 700/3 There were, further, different types of cohesive forces... (3) Ionic or heteropolar cohesion. In the rock-salt atom, for instance, the valency electron of the sodium migrated into the chlorine structure, giving rise to electrostatic action. 1964J. W. Linnett Electronic Struct. Molecules ix. 143 Values which bring the results for these heteropolar molecules to the same scale as that for homopolar molecules. |