| 释义 |
polyphase, a. (n.) Electr.|ˈpɒlɪfeɪz|
[f. poly- + phase n. 3.]
a. lit. Of many phases: applied to systems of alternating electric currents (magnets, transformers, etc.) in which are employed two, three, or more such currents of identical frequency but differing from one another in phase, that is, which recur one after the other with regular successions of phase; also called multiphase.
1891Electrician XXVII. 376 Three articles on the polyphase alternate current system. 1895S. P. Thompson Polyphase Electric Currents 53 By the adoption of polyphase systems, as compared with single-phase systems, there is effected a saving. 1900Engineering Mag. XIX. 754/1 In other fields the rotary or polyphase current has of late made marked advance.
(b) as n.1901Daily Chron. 7 Nov. 7/3 The witness..came to discover that the polyphase was capable of being stopped within a remarkably short space.
b. Consisting of or occurring in a number of separate stages.
1936Proc. Prehist. Soc. II. 155 In 1932..I attempted an analysis of the evidence for a polyphase Ice Age. 1938Mem. Geol. Soc. Amer. VI. 84 Heteroaxial symmetry means, therefore, a sideward drag in the course of tectonic flow, or a polyphase deformation. 1958R. S. Woodworth Dynamics of Behavior ii. 39 The child's developing purposiveness spreads in the opposite direction. It is visible first in the little two-phase and polyphase acts, their time span being only a few seconds. 1969Bennison & Wright Geol. Hist. Brit. Isles iv. 85 The Manx Slates have been affected by polyphase folding and low-grade metamorphism.
c. Consisting of or involving a number of different phases of matter.
1940Jrnl. R. Aeronaut. Soc. XLIV. 538 Precipitation hardening leads generally to the formation of polyphase systems, and a solution hardened metal shows distinct advantages. 1950Proc. Amer. Acad. Arts & Sci. LXXVIII. 167 Poly-phase, poly-component chemical systems. 1975Physics Bull. May 225/1 The last chapter deals with microstructural and polyphase effects. |