| 释义 |
coaxial, a.|kəʊˈæksɪəl|
[f. co- + axis + -al1; cf. axal.]
1. Math. Having a common axis.
2. a. Various techn. uses.
1904A. Russell Altern. Currents iv. 95 The equipotential surfaces between the two cylinders are coaxial cylinders no matter how small a may be. 1914Ibid. (ed. 2) iii. 108 (heading) The mutual induction of two coaxial coils. 1921Jrnl. Franklin Inst. CXCI. 707 The problem of transmission over a system consisting of n coaxial cylindrical conductors, which may be either in electrical contact at their adjacent surfaces or separated from each other by dielectric spaces. 1934Electr. Comm. XII. 161/2 The diameters of these coaxial conductors were so chosen as to obtain for each of the two transmission paths a diameter ratio which approximates the optimum value. 1940Chambers's Techn. Dict. 172/1 Co-axial carbons, carbons in an arc lamp so arranged as to be in the same straight line with each other. 1951Gloss. Terms Plastics (B.S.I.) 40 co-axial feeder, a type of cable for the transmission of radio frequency power consisting of concentric inner and outer conductors insulated from one another. 1958Chambers's Techn. Dict. 967/1 Coaxial filter, one in which a section of coaxial line is fitted with re-entrant elements to provide the inductance and capacitance of a filter section. 1958M. L. Hall et al. Newnes Compl. Amat. Photogr. 111 Modern cameras are fitted with flash contacts in the form of a two pin plug or co-axial socket on the shutter. 1964Gloss. Letterpress Rotary Print. Terms (B.S.I.) 28 Co-axial drive, a system of press drive whereby a number of smaller powered motors drive the press units by means of suitable couplings on a common shaft.
b. spec. Of an airscrew or propeller: mounted on concentric shafts.
1934Engineering 3 Aug. 126/2 Coaxial contrary-turning screws... The same disposition of screws had been successfully employed on an Italian flying boat. 1936Jrnl. R. Aeronaut. Soc. XL. 221 Co-axial airscrews, one immediately behind the other (say on a single central engine), turning in opposite directions. 1946Aeroplane Spotter 13 July 162/2 Powered by two 2,080 h.p. Rolls-Royce Merlin 140 motors, each driving two Rotol three-blade, co-axial, counter-rotating airscrews. 1949Gloss. Aeronaut. Terms (B.S.I.) ii. 19 Coaxial propellers, two propellers mounted on concentric shafts having independent drives and rotating in opposite directions.
c. coaxial cable, a cable containing several coaxial lines and usu. also conductors to supply repeaters and other associated equipment; also, a coaxial line; coaxial line, a transmission line made up of two concentric circular conductors separated by an insulating medium, used esp. for medium and high frequency signals in television and multiplex telephony. Also ellipt. as n.
1934Electr. Comm. XIII. ii. 159 Frequency bands of the order of 1,000 kc. or more may be transmitted for long distances over coaxial lines and utilised for purposes of multiplex telephony or television. A coaxial line is a metal tube surrounding a central conductor and separated from it by insulating supports. 1935Ibid. iv. 351/2 If similar conducting and insulating materials are used, shielded balanced pairs and coaxials have similar transmission-frequency characteristics. 1936Ibid. xiv. iii. 175/1 The coaxial cable systems where all channels are carried over a single coaxial line. 1938Times 7 Jan. 14/1 The alternative..is to feed the provinces from London by a special land-line, known as a co-axial cable. 1940Chambers's Techn. Dict. 172/1 Co-axial cable, a type of cable in which a central conductor is surrounded by an outer tubular conductor... Its low attenuation makes it suitable for the transmission of video-frequency currents in television. 1943Electronic Engin. XVI. 64 The distribution of the signal via video frequency local co-axial cable networks. 1955Sci. Amer. Apr. 48/3 A coaxial cable can handle only 600 phone calls and two TV shows. 1959Ann. Reg. 1958 521 It was agreed..that a round-the-world Commonwealth coaxial-cable telephone system should be constructed. 1966McGraw-Hill Encycl. Sci. & Technol. III. 245/2 In a typical cable each coaxial line has an outer conductor with an inside diameter of o·375 in.
Hence coˈaxially adv.
1881O. Reynolds in Nature XXIII. 477 Two eddies should face, and so exactly as to be coaxial. 1884S. P. Thompson Dynamo-Elect. Mach. 198 Let a coil be introduced..let a second coil..be laid coaxially with it. |