单词 | oscillating |
释义 | oscillatingadj. 1. a. That swings or moves to and fro; vibrating. ΘΚΠ the world > movement > motion in specific manner > alternating or reciprocating motion > oscillation > [adjective] oscillatory1670 oscillating1743 oscillant1857 1743 W. Emerson Doctr. Fluxions 294 If the oscillating Body is not a Globe. 1835 W. Kirby On Power of God in Creation of Animals I. iv. 146 These oscillating plants owe their existence to different species of animalcules. 1899 T. C. Allbutt et al. Syst. Med. VI. 681 When the patient's eyes are closed, he may walk in an uncertain oscillating fashion. 1929 Q. Jrnl. Econ. 44 64 It has been held that competition between two sellers will result in..a perpetually oscillating price. 1994 W. Maples & M. Browning Dead Men do tell Tales v. 64 Anatomical Stryker saws, whose oscillating blade is designed to cut through bone, but not flesh. b. Designating or relating to a machine characterized by the oscillatory motion of a part or parts.Originally spec. with reference to a steam engine having a cylinder mounted on trunnions which oscillated though a small arc so that the piston rod could follow the movements of the crank. ΘΚΠ society > occupation and work > equipment > machine > parts of machines > [adjective] > oscillating oscillating1821 1821 A. Manby Specif. Patent 4558 4 A longitudinal section of the oscillating engine. 1870 Public Opin. 16 July 81 The turning gear consists of a small supplemental oscillating cylinder. 1882 Rep. Precious Metals (U.S. Bureau of Mint) 21 A Huntington oscillating mill is used, crushing about 7 tons of ore per day. 1969 E. P. Anderson Home Appliance Servicing (ed. 2) xix. 307 The oscillating mechanism consists essentially of a worm gear on the motor shaft that engages a gear on a short jack shaft. 1989 Miller's Collectables Price Guide 1989–90 449/3 A single oscillating cylinder vertical reversing over-crank stationary engine. 2. Of an electric current: undergoing very rapid periodic reversal of direction; (also) characterized by or produced by such a current. Cf. oscillate v. 1c.Oscillating as used of a current normally implies a much higher frequency than alternating and also a different origin (see oscillator n. 3a). ΘΚΠ the world > matter > physics > electromagnetic radiation > electronics > electronic phenomena > [adjective] > oscillating oscillatory1853 oscillating1888 the world > matter > physics > electromagnetic radiation > electronics > electronic devices or components > [adjective] > oscillating oscillating1920 oscillatory1948 1888 Science 13 July 18/2 We have thus mentioned two causes of obstruction met with by rapidly oscillating currents trying to traverse a metal rod. 1906 A. E. Kennelly Wireless Telegr. viii. 94 (heading) Energy of electric oscillations, or oscillating currents, set up in a vertical receiver. 1920 E. W. Stone Elem. Radiotelegr. xi. 44 If two oscillating circuits containing inductance and capacity be..coupled together, they act very differently than when they are allowed to oscillate by themselves. 1948 A. L. Albert Radio Fund. x. 386 Variations in the plate output circuit will not be reflected back into the control-grid oscillating circuit. 1974 ‘I. Drummond’ Power of Bug xi. 166 The tiny transmitter..emitted a high, oscillating signal on ultra short wave. 1995 Kay's Catal. Autumn–Winter 1017/3 Quartz crystal and micro computer chip combine for oscillating powerpulse supply. 3. Mathematics. Of a series or function: increasing and decreasing without tending to a limit or diverging as successive terms are taken (in the case of a series) or as the variable tends to infinity (in the case of a function). ΘΚΠ the world > relative properties > number > algebra > [adjective] > relating to expressions > relating to functions generating1671 exponential1704 discontinuous1803 functional1806 odd1812 periodic1820 syzygetic1850 convex1858 graphometric1865 polycyclic1869 subrational1875 synectic1876 variational1879 polyhedral1881 holomorphic1886 tropical1887 Gudermannian1888 monogeneous1888 monotonous1890 oscillating1893 monotonic1901 monotone1903 orthogonalized1909 schlicht1925 concave1942 deconvolved1974 unate1978 1893 Proc. Royal Soc. 54 121 In some physical problems divergent series are actually used for calculation. A notable example is Stokes's divergent formula for the oscillating function Jn(x). 1897 Amer. Math. Monthly 4 302 Euler concluded that the sum of the oscillating series 1 −1 +1 −1 +1 −1 … = ½, for the reason, that by stopping with an even number of terms the sum is 0, and by stopping with an odd number of terms the sum is 1. 1973 D. G. Ball Introd. Real Anal. iii. 59 Consider the sequence 21/ 2, −11/ 2, 21/ 4, −11/ 4, 21/ 8, −11/ 8, 21/ 16, −11/ 16,... This sequence is bounded and oscillating. 1992 Nature 17 Dec. 658/1 The summations give rise to a small value because the scattering factors and the exponents are oscillating complex functions in the transform. Compounds oscillating universe n. Astronomy a model of the universe in which expansion is followed by contraction, explosion, and expansion once more, in an infinite cycle. ΚΠ 1933 H. P. Robertson in Rev. Mod. Physics 5 74/1 Such a universe we refer to as oscillating and denote it by O.] 1933 Rev. Mod. Physics 5 76/1 Einstein's recent proposal to set λ=0 would restrict us to the oscillating universes (type O) and the monotonic universes of the first kind. 1968 R. E. W. Maddison tr. P. Muller Conc. Encycl. Astron. 90/1 Other cosmological models exist in which alternate expansion and contraction can take place giving rise to a pulsating or oscillating universe. 1997 Nature 3 Apr. 448/3 In a high-density Universe, gravity eventually stops the expansion. The Universe then collapses, and if the collapse ends in a bounce and another expansion, we have an oscillating Universe. This entry has been updated (OED Third Edition, September 2004; most recently modified version published online March 2022). < adj.1743 |
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