单词 | cycles per second |
释义 | > as lemmascycles per second b. Physics, etc. A recurring series of operations or states, spec. in internal combustion engines. Also, short for cycles per second (abbrev. C.P.S., cps., c/s), the unit of frequency of an oscillation (as an alternating current, a sound wave, etc.). ΘΚΠ the world > matter > physics > [noun] > specific concepts or principles of > recurring sequence cyclea1884 the world > matter > physics > electromagnetic radiation > electricity > electric current > alternating current > [noun] > rate of recurrence > unit of cycle1920 the world > matter > physics > science of sound > vibration > [noun] > unit of frequency c/s1940 c.p.s.1940 cycles per second1940 the world > matter > physics > electromagnetic radiation > electronics > electronic phenomena > [noun] > frequency > unit of frequency kilocycle1921 megacycle1926 Hertz1928 Mc1936 Mc/s1936 c/s1940 c.p.s.1940 cycles per second1940 a1884 E. H. Knight Pract. Dict. Mech. Suppl. 382/2 The complete cycle of motions in the Otto engine is accomplished only by two complete revolutions of the working shaft, or four strokes of the piston. 1887 Encycl. Brit. XXII. 479/2 Generally in heat-engines the working substance returns periodically to the same state of temperature, pressure, volume, and physical condition. When this has occurred the substance is said to have passed through a complete cycle of operations. 1892 T. O'C. Sloane Standard Electr. Dict. (1893) 175 Cycle of alternation, a full period of alternation of an alternating current. It begins properly at the zero line, goes to a maximum value in one sense and returns to zero, goes to maximum in the other sense and returns to zero. 1920 Whittaker's Electr. Engineer's Pocket-bk. (ed. 4) 348 In the early days, when electricity was used only for lighting, frequencies round about 100 cycles were usual. 1929 A. F. Collins Aviation 148 After the power stroke is completed three more strokes must take place before there is another explosion stroke and, hence, another power stroke. Then the series of strokes, or cycle, as it is called, begins all over again, and this is what is meant by a four-stroke cycle engine. 1940 Chambers's Techn. Dict. 206/1 C.P.S., cps., c/s, abbrevs. for cycles per second, the usual measure of frequency. 1944 A. Wood Physics of Music iv. 42 The lowest frequencies used in the orchestra are those of the double bass and the bass tuba, which lie between 60 and 80 cycles per second... Tones of male speech embrace a range of from 120 to 8000 c.p.s. 1959 Consumer Rep. (N.Y.) Sept. 452/2 Only one [tweeter] provided adequate and relatively uniform power in the high-frequency range to beyond 20,000 cps. 1965 Electronics Weekly 10 Mar. 22/5 It operates from a standard single phase 50 c/s supply. 1967 Electronics 6 Mar. 325/1 Markus continues to use ‘cycles per second’ instead of ‘hertz’. < as lemmas |
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