| 释义 |
homopolar, a.|hɒməʊˈpəʊlə(r)|
[f. homo- + polar a.]
1. Bot. Having equal poles, as in the figures called Stauraxonia homopola (1883 Encycl. Brit. XVI. 844).
2. Electr. Of an electric generator or its operation: having or involving such an arrangement of magnets that the direction of the flux does not alternate with relation to the motion of the armature conductor(s), so that a direct current is generated without the use of commutators.
1896S. P. Thompson Dyn.-Electr. Machinery (ed. 5) 475 (heading) Homopolar (‘unipolar’) dynamos. Ibid., Where the motion is such that the conductor moves continuously past poles of one kind only, the inductive operation is said to be homopolar. 1938Meares & Neale Electr. Engin. Pract. I. iv. 233 A homopolar dynamo is essentially a low voltage, heavy-current machine, but..it is generally more satisfactory to employ a motor generator driven from the ordinary supply mains. 1962[see Faraday('s) disc].
3. Chem. [ad. G. homöopolar (R. Abegg 1906, in Zeitschr. f. anorg. Chem. L. 309); cf. homœopolar s.v. homœo-.] Formed by or arising out of the sharing of electrons between neutral atoms, without ionization; covalent.
1922C. H. Desch Metallography (ed. 3) xv. 341 In all probability the new theory of valency based on the distribution of electrons in the molecule, will provide a satisfactory explanation of the formulæ of compounds of electrically similar (‘homopolar’) elements. 1930G. Thomson Atom 219 In such compounds the two atoms are on an equal footing and the compounds are called homopolar. 1940Mott & Gurney Electronic Processes in Ionic Crystals i. 9 The transition from polar to homopolar binding. 1972M. H. Battey Min. for Students i. 9/1 The covalent (or homopolar) bond is formed when two atoms..share a pair of electrons, one electron being supplied by each atom.
Also homopolic |-ˈpɒlɪk| a. = sense 1 above.
1883Homopolic [see homaxonial]. |