英和和英

発音

• 韻: -eɪpə(ɹ)

名詞

neper (複数形 nepers)

1. (electronics) A non-SI unit of the attenuation (または sometimes gain) of field and power quantities such as electronic signals; the natural logarithm of a ratio, with 1 Np (a ratio of 2.718:1) being equivalent to 8.686 dB.
   • 1994, T. G. Leighton, The Acoustic Bubble, page 28,

     Values of b, the amplitude attenuation constant, are given for various materials in Table 1.1. Having dimensions of [length]^-1, it is usually measured in nepers per centimetre (Np cm^-1).

   • 2006, R. K. Shevgaonkar, Electromagnetic Waves, page 15,

     The unit of α is nepers per meter. It can be easily seen that if a line has an attenuation constant of 1 neper/m, a unit amplitude voltage wave will reduce to e^-1 over a distance of 1 meter.

   • 2008, Alan J. Fenn, Adaptive Phased Array Thermotherapy for Cancer, page 105,

     The attenuation constant for the phantom muscle tissue is α_m = 10.0 nepers/m.

関連する語

• Np

アナグラム

• perne, preen