| 释义 |
Pupin Teleph.|pjuːˈpiːn|
The name of Michael I. Pupin (1858–1935), U.S. physicist born in Imperial Hungary, used attrib. or in the possessive to designate equipment, methods, and principles introduced by him, as Pupin cable, a telephone cable provided with loading coils at regular intervals so as to reduce attenuation and distortion of the signal; Pupin coil = loading coil s.v. loading vbl. n. 7; Pupin's law (see quot. 1911). (No longer current.)
1900Amer. Jrnl. Sci. CLX. 64 Pupin's interrupter may be modified to serve as an alternator in the following way. 1901Sci. Abstr. IV. 1043 An intermittent direct current is produced by means of a Pupin interrupter. 1905Ibid. B. VIII. 352 An adjacent insulator carries a vacuum lightning discharger contained in an ebonite case, to protect the Pupin coil from damage. 1908Ibid. XI. 495 The range of transmission through a Pupin cable as compared with that through an open line having the same damping constant is smaller. 1911J. A. Fleming Propagation of Electr. Currents iv. 122 Pupin reduced the solution of the problem to a verbal statement, which may be called Pupin's Law, as follows: If there be a non-uniform cable line loaded with inductance coils at equal intervals, and if we consider the total inductance and resistance to be smoothly distributed along the line, then these two lines, the non-uniform and uniform lines, having the same total resistance and inductance, will be electrically equivalent for transmission purposes as long as one half of the distance between two adjacent coils expressed as a fraction of 2π taken as the wave length, is an angle so small that its sine has practically the same numerical value as that angle in circular measure. 1934A. L. Albert Electr. Communication xi. 282 It remained for Pupin successfully to solve the difficult problem of loading... His method is known as the series or Pupin system of loading. 1955P. R. Bardell Magnetic Materials in Electr. Industry vii. 180 These coils are often referred to in the literature as ‘Pupin’ coils but are now usually known as ‘Loading Coils’. 1958[see next]. |