| 释义 |
sinusoidal, a.|saɪnəˈsɔɪdəl|
[f. prec. + -al1; cf. F. sinusoïdal.]
Resembling, pursuing, flowing in, the wave-like course of a sinusoid; having the form of a sinusoid; varying periodically (with time, distance, etc.) as a sine varies with an angle; (see also quot. 1910).
1878Mayer Sound 64 Hold the glass up to the light, and you will see a delicate wavy line, a sinusoidal trace. 1879G. B. Prescott Sp. Telephone 54 The curve expressive of a simple pendulous vibration—that is a sinusoidal curve. 1900Lancet 1 Dec. 1580/1 These patients have all been treated with the electrical bath and the sinusoidal current. 1910N. Hawkins Electr. Dict. 400/2 Sinusoidal alternator, an alternating current dynamo which generates simple harmonic or sinusoidal currents. 1948Nature 28 Feb. 295/1 Along with the detailed solutions of the differential equations for step velocity input..is given a brief development of the solutions for sinusoidal input. 1957G. E. Hutchinson Treat. Limnol. I. v. 357 The height of the wave at first decreases slightly, then increases as the wave approaches breaking. During the final phase of the rise in height, the sinusoidal or trochoidal form is lost. 1975Nature 23 Oct. 674/1 Patterns of alternating light and dark bars with a sinusoidal luminance profile across the bars—sinusoidal gratings—are commonly used to study spatial interactions in the visual system.
Hence sinuˈsoidally adv.
1888Philos. Mag. Ser. v. XXVI. 373 Let f vary sinusoidally with the time. 1929J. A. Ratcliffe Physical Princ. Wireless i. 3 The simplest form of alternating current is one in which the current varies sinusoidally with the time. 1947Jrnl. Inst. Electr. Engineers CXIV. iii. 279/1 When the hemispherical end of a reproducing stylus is moved in contact with a sinusoidal surface of comparable curvature, the stylus tip does not itself move sinusoidally. 1974Sci. Amer. Nov. 34/3 Voltages and current vary sinusoidally at a frequency of 60 hertz (cycles per second) in the U.S. and Canada and 50 hertz in most other countries of the world. |