perveancen.

Brit.

/ˈpəːvɪəns/, U.S.

/ˈpərviəns/

Origin: Perhaps formed within English, by derivation. Etymons: pervious adj., permeance n., -ance suffix.

Etymology: Perhaps < perv- (in pervious adj.) + -eance (in permeance n.), or perhaps < pervi- (in pervious adj.) + -ance suffix, after conductance n., permittance n., etc., with spelling in -eance after words such as permeance n.

Electronics.

A parameter relating current to voltage in some thermionic diodes (e.g. in an electron gun), equal to IV^−3/2, where I is the anode current and V is the anode voltage.

ΘΚΠ

the world > matter > physics > electromagnetic radiation > electronics > electronic devices or components > thermionic valve > [noun] > specific valve parameter

perveance1928

1928 Y. Kusunose in Res. Electrotechn. Lab. (Japan) No. 237. 3 The constant G which is called ‘perveance’ may be determined from the electrode configurations.

1962 C. Susskind Encycl. Electronics 229/2 It is convenient to classify electron guns in terms of their perveance, a parameter that remains invariant when the gun is geometrically scaled.

2002 Microwave Engin. Europe (Nexis) 31 Jan. 18 The low perveance means that a high voltage is required between the cathode and the anode, of the order of 100kV.

This entry has been updated (OED Third Edition, December 2005; most recently modified version published online March 2022).

单词	perveance
释义	perveancen. Brit. /ˈpəːvɪəns/, U.S. /ˈpərviəns/ Origin: Perhaps formed within English, by derivation. Etymons: pervious adj., permeance n., -ance suffix. Etymology: Perhaps < perv- (in pervious adj.) + -eance (in permeance n.), or perhaps < pervi- (in pervious adj.) + -ance suffix, after conductance n., permittance n., etc., with spelling in -eance after words such as permeance n. Electronics. A parameter relating current to voltage in some thermionic diodes (e.g. in an electron gun), equal to IV^−3/2, where I is the anode current and V is the anode voltage. ΘΚΠ the world > matter > physics > electromagnetic radiation > electronics > electronic devices or components > thermionic valve > [noun] > specific valve parameter perveance1928 1928 Y. Kusunose in Res. Electrotechn. Lab. (Japan) No. 237. 3 The constant G which is called ‘perveance’ may be determined from the electrode configurations. 1962 C. Susskind Encycl. Electronics 229/2 It is convenient to classify electron guns in terms of their perveance, a parameter that remains invariant when the gun is geometrically scaled. 2002 Microwave Engin. Europe (Nexis) 31 Jan. 18 The low perveance means that a high voltage is required between the cathode and the anode, of the order of 100kV. This entry has been updated (OED Third Edition, December 2005; most recently modified version published online March 2022). < n.1928
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