| 单词 | tie-line |
| 释义 | ˈtie-line
[f. tie- + line n.2]
1. Surveying. A line measured on the ground after the principal lines of a triangulated survey have been measured, with the object of checking the accuracy of the work.
1877Rankine Man. Civ. Engin. 24 The accuracy of the measurements in every important triangle should be checked by measuring a ‘tie-line’, from one of its angles to a known point in the opposite side.
2. Teleph. A line connecting two private branch exchanges. Also transf.
1923T. E. Herbert Telephony xvii. 437 Should an answering plug be inserted into a jack of the tie line, and the corresponding calling plug be placed into an exchange jack, [etc.]. 1955E. F. Russell Somewhere a Voice (1965) 107 Man is born of Earth and needs a tieline to Earth. 1969J. Martin Telecommunications & Computer v. 91 Many companies have a leased system of telecommunications lines with switching facilities. To telephone a person in a distant company location, an employee must first obtain the appropriate tie line to that person's private branch exchange. 1978Broadcast 29 May 9/2 Dring got a phone call out [of Zaire] via the BBC's New York office on tie line to the TV Centre just three minutes before the nine o'clock bulletin went out.
3. A line in a phase diagram joining two points that each represent the composition of two phases in equilibrium with one another.
1924A. E. Hill in H. S. Taylor Treat. Physical Chem. I. ix. 400 No solution therefore can exist having composition indicated by points within the area A–B–C–B′–A′, but such compositions can lead only to two conjugate solutions of composition lying upon the curves at the intersections with the isothermal tie-lines. 1935Amer. Jrnl. Sci. CCXXIX. 174 All liquids a–b are in equilibrium with olivine, each with an olivine of different composition as indicated by the tie-lines. 1961Geol. Mag. XCVIII. 336 (caption) Tie-lines joining co-existing, chemically analysed pyroxenes from igneous rocks. 1979Nature 3 May 53/2 (caption) Miscibility gap between carbonate and silicate melts... Conjugate liquids at 0·7 kbar and 7·6 kbar are joined by tie-lines.
4. A pipeline or transmission line connecting two distribution systems or two parts of a single system.
1949Sun (Baltimore) 5 July 10/4 With the completion of a 48-inch tie-line..the city Bureau of Water Supply believes it could supply 4,000,000 gallons daily. 1962Newnes Conc. Encycl. Electr. Engin. 348/1 If two machines [sc. a.c. generators] are to be coupled together by a tie⁓line perhaps 50 or 60 miles in length, there may be an appreciable impedance presented to the flow of the synchronizing current. 1974Sci. Amer. Nov. 40/3 Its objective is to maintain the frequency within an area served by several generating stations and to maintain the sum of all active tie-line power exchanges between the area and its neighbors. |
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