neper

See also: néper and nëpër

English

Etymology

From Joannes Neper, the Latinized name of John Napier, a Scottish mathematician.

Pronunciation

• Rhymes: -eɪpə(ɹ)

Noun

neper (plural nepers)

1. (electronics) A non-SI unit of the attenuation (or 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.

Related terms

• Np

Anagrams

• perne, preen

Norwegian Bokmål

Noun

neper m or f

1. indefinite plural of nepe

Norwegian Nynorsk

Noun

neper f

1. indefinite plural of nepe

Romanian

Etymology

Borrowed from French néper.

Noun

neper m (plural neperi)

1. neper

Declension

Declension of neper

	singular		plural
	indefinite articulation	definite articulation	indefinite articulation	definite articulation
nominative/accusative	(un) neper	neperul	(niște) neperi	neperii
genitive/dative	(unui) neper	neperului	(unor) neperi	neperilor
vocative	neperule		neperilor