英语词源字典 - 在线词源网站

neper [neper 词源字典]: "A unit of measurement used in comparing voltages, currents, and power levels, especially in communication circuits. The difference between two values in nepers is equal to the natural logarithm of their ratio for voltages and currents or to half of this for power differences", Early 20th century: from Neperus, Latinized form of Napier (see Napier, John).[neper etymology, neper origin, 英语词源]