Fr.: nutritif, nourrissant
1) Serving to nourish; providing nutriment; nutritious.
Adjective and agent noun from L. nutrire, → nourish.
L.L. nyctalopia, from Gk. nukt, → night + al(aos) "blind" + -opia, akin to ope "view, look," ops "eye."
Fr.: formule de Nyquist
The mean square noise voltage across a resistance in thermal equilibrium is four times the product of the resistance, Boltzmann's constant, the absolute temperature, and the frequency range within which the voltage is measured. → Johnson-Nyquist noise.
Fr.: fréquence de Nyquist
The highest frequency that can be determined in a Fourier analysis of a discrete sampling of data.
Nyquist-Shannon sampling theorem
farbin-e nemunân-giri-ye Nyquist-Shannon
Fr.: théorème d'échantillonnage de Nyquist-Shannon
The minimum number of resolution elements required to properly sample a signal, such as a star image, without causing erroneous effects known as aliasing. For electronic imaging, this number is generally taken as 2 pixels across the seeing disk diameter at the half intensity points. Also called → Shannon's sampling theorem and → sampling theorem.
Named after Harry Nyquist (1889-1976), a Swedish-born American physicist, who made important contributions to information theory, and Claude Elwood Shannon (1916-2001), an American mathematician and pioneer of information theory; → theorem.