| 释义 |
slope-
In combs., representing either the n. or adj., or the stem of the vb.a. With nouns, as slope-block, slope-board, slope-desk, etc. (see quots.); slope circuit Electronics = slope filter below; slope current, (a) an air current produced when wind is deflected upwards by a hill; (b) an ocean current that arises when the surface of the sea slopes as a result of wind action; slope detection Electronics, the detection of a frequency-modulated signal by means of a slope filter followed by a detector for amplitude-modulated signals; so slope detector; slope filter Electronics, a filter whose response increases or decreases more or less uniformly over the frequency range in which it is used; slopehead U.S. slang = slope n.1 6 (abusive; cf. also slopy n.); slope wash, slopewash Geomorphol., the downhill movement of soil or rock under the action of gravity assisted by running water not confined to a channel.
1834–47J. S. Macaulay Field Fortif. (1860) 206 The *slope-block is a cube of wood, whose side is made equal to the intended difference of level.
1648Hexham ii. s.v. Galm, The *Slope-board-windowes in a Steeple of Bells, to give them the better sound.
1966M. Schwartz et al. Communication Systems & Techniques v. 230 One side of a resonance curve is used as a ‘*slope circuit’ in a frequency detector. 1978S. Haykin Communication Systems iv. 342 Basically, a frequency discriminator consists of a slope circuit followed by an envelope detector.
1931V. W. Pagé Henley's ABC Gliding & Sailflying vii. 150 This ascending air current, which is defined as a *slope current, forms the source of energy for sailing flight. 1939Revelle & Shepard in P. D. Trask Recent Marine Sediments 277 In the Southern California region..the chief role in the transportation of débris must be played by tidal currents and non-permanent eddying ‘slope currents’ resulting from wind action. 1968G. Neumann Ocean Currents iv. 195 The resulting slope of the sea surface produces horizontal pressure gradients in meridional direction which, in turn, cause slope currents to develop.
1884Yates Recoll. iii, On the edge of his green *slope-desk.
1949B. Grob Basic Television xxi. 433 While *slope detection is seldom used in television receivers for reception of the associated sound signal, the principle is important because it illustrates how an FM signal can be received with an AM system. 1978D. Cameron Audio Technol. Systems iv. 129 Economy-type FM tuners occasionally use some form of slope detection.
1958A. W. Keen Frequency Modulation iii. 83 This circuit, with the resonant frequency adjusted above the highest value of the f.m. signal-frequency, or below the lowest, was the first to be used..as an f.m. detector and is known as a ‘*slope’ detector. 1977F. G. Stremler Introd. Communication Systems vi. 293 Although the slope detector is economical, it has a very limited range and its use is restricted to input signals with small frequency variations.
1805R. W. Dickson Pract. Agric. I. 389 Machines..for scooping out *slope drains, where necessary, in a field.
1937Proc. IRE XXV. 474 The intermediate-frequency output of a superheterodyne receiver is fed through a limiter to a *slope filter or conversion circuit which converts the frequency modulation into amplitude modulation. 1942A. Hund Frequency Modulation i. 84 For the upper cutoff frequency..of the slope filter a voltage 2E is obtained at the output of this filter.
1966*Slopehead [see slope n.1 6]. 1968Listener 23 May 656/2 At Can Tho, two years ago, I heard American Air Force men sing a ballad about the Vietnamese, whom they then called ‘slopeheads’ or ‘slopes’.
1828Sieuart Planter's G. (ed. 2) 199 No water can stagnate..where the entire bottom of the space..is worked to a uniform level, that is, a *slope-level. 1875Knight Dict. Mech. 2214/2 The slope-level or clinometer is used for determining the angle of embankments, the grade of roads, pitch of roof [etc.].
1712J. James tr. Le Blond's Gardening 67 The Turf must be laid so that..the *Slope-line be kept without Elbows and Inequalities. 1859Cayley Math. Papers IV. 108 A system of contour lines and steepest or slope lines.
1683Moxon Mech. Exerc., Printing xiii. ⁋3 The *Slope-sholdering of the Counter-Punch.
1669Sturmy Mariner's Mag. ii. xvi. 96 This Distance from B to H is the true Length of the *Sloap-side BE. 1870Morris Earthly Par. II. iii. 469 A gay-striped tent Just raised upon the slope-side.
1864G. W. Dasent Jest & Earnest (1873) I. 38 These *slope-swards are often so large, that it takes more than a day to work them out.
1938C. F. S. Sharpe Landslides & Related Phenomena i. 8 The series can be represented as follows: Stream-flow (much water, small load, low angle), *Slopewash, Sheetflood, Mudflow, Earthflow, Debris-avalanche, Landslide (little water, large load, moderate to high angle). 1966J. Wyckoff Rock, Time, & Landscape iv. 71 As the ravine is cut deeper, its walls are worn back by weathering, mass wasting, and slope wash. 1978Nature 23 Feb. 740/1 Slopewash seems important in sediment transport and fallen sandstone blocks and trees accumulate sediment on their upslope sides.
b. Forming parasynthetic adjs., as slope-browed, slope-eared, slope-roofed, slope-toothed.
1647R. Stapylton Juvenal 129 Thou satest up till midnight; which..None that cards wooll with sloap-tooth'd wyre would do. 1813J. N. Brewer Beauties Eng. & Wales XII. ii. 116 It has very ancient church with a slope-roofed tower. 1827Griffith tr. Cuvier II. 153 The slope-eared bat (vespertilio emarginatus) is another of the bats of Europe. 1837Carlyle Fr. Rev. iii. iii. ii, A bald, rude, slope-browed, infuriated visage of the canine species. |