Logarithmic unit for ratios of measurements of physical field and power quantities
For other uses, see Neper (disambiguation).
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John Napier after whom the unit is named
The neper (symbol: Np) is a logarithmic unit for ratios of measurements of physical field and power quantities, such as gain and loss of electronic signals. The unit's name is derived from the name of John Napier, the inventor of logarithms. As is the case for the decibel and bel, the neper is a unit defined in the international standard ISO 80000. It is not part of the International System of Units (SI), but is accepted for use alongside the SI.[1]
^The International System of Units (SI) (9 ed.). International Bureau of Weights and Measures. 2019. pp. 145–146. Archived from the original on 2022-10-09.
The neper (symbol: Np) is a logarithmic unit for ratios of measurements of physical field and power quantities, such as gain and loss of electronic signals...
of earthquakes and movement in the Earth Sound level, with units decibel Neper for amplitude, field and power quantities Frequency level, with units cent...
astronomer. He was the 8th Laird of Merchiston. His Latinized name was Ioannes Neper. John Napier is best known as the discoverer of logarithms. He also invented...
the real part of the propagation constant and is measured in nepers per metre. A neper is approximately 8.7 dB. Attenuation constant can be defined by...
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one-tenth of a bel: 1 dB = 0.1 B. The bel (B) is 1⁄2 ln(10) nepers: 1 B = 1⁄2 ln(10) Np. The neper is the change in the level of a root-power quantity when...
of a sound relative to a reference value. It is denoted LI, expressed in nepers, bels, or decibels, and defined by L I = 1 2 ln ( I I 0 ) N p = log 10...
attested by the early 17th century, along with obsolete forms Deneper, Neper. The river is also sometimes called by the Russian name Dnepr. The initial...
P is the sound power; P0 is the reference sound power; 1 Np = 1 is the neper; 1 B = 1/2 ln 10 is the bel; 1 dB = 1/20 ln 10 is the decibel. The commonly...
particle velocity; v0 is the reference particle velocity; 1 Np = 1 is the neper; 1 B = 1/2 ln 10 is the bel; 1 dB = 1/20 ln 10 is the decibel. The commonly...
Communications (IPC) NP junction or PN junction in a semiconductor device Neper (Np), a logarithmic unit for ratios Neptunium, a chemical element with symbol...
Tayet, and Taytet) was an Egyptian goddess. Some attest her husband was Neper while others state she was possibly the consort of Hedjhotep. Tayt was the...
the original on 16 November 2022. Retrieved 15 November 2022. "Udhëtim nëpër fjalorin e Kosovës". Telegrafi (in Albanian). 19 July 2019. Archived from...
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