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numeral system râžmân-e adadi, é adadhâ Fr.: système de numération A set of → symbols and → rules for representing → numbers. Same as → number system. See also: → Greek numeral system, → Roman numeral system, → Indian numeral system. |
numerator šomârân (#) Fr.: numérateur The quantity x in a fraction x/y). The quantity y is the → denominator. L.L. numerator "a counter, numberer," from L. numera(re) "to number," → number + -tor a suffix forming personal agent nouns from verbs and, less commonly, from nouns. Šomârân, agent noun of šomârdan, → number. |
numerical adadi (#) Fr.: numérique Relating to or expressed in numbers. Adj. of → number. |
numerical analysis ânâlas-e adadi Fr.: analyse numérique The study of methods for approximation of solutions of various classes of mathematical problems including error analysis. |
numerical modeling modelsâzi-ye adadi (#), tarzâlsâzi-ye ~ Fr.: modélisation numérique The prediction of the evolution of a system via numerical construction of approximate solutions to the governing equations. |
numerical simulation mânandeš-e adadi, hamânand sâzi-ye ~ Fr.: simulation numérique Another name for → numerical modeling. → numerical; → simulation. |
Nunki (σ Sagittarii) Nunki Fr.: Nunki The second brightest star in the constellation → Sagittarius. It is a blue-white → massive star of → spectral type B2.5 V lying 225 → light-years away. Unusual name of Babylonian origin, of unknown significance. |
nutate kaltâvidan Fr.: osciller To undergo or show nutation. Nutate, back formation from → nutation. |
nutation kaltâv Fr.: nutation Mechanics: A wobbling motion of a spinning rigid body, such as a top,
as it precesses about its vertical axis. Fromm L. nutation-, from nutat(us), p.p. of nutare "to wobble, to sway, to nod repeatedly," from nu "nod" + -ta frequentative suffix + -tus p.p. ending + -ion a suffix denoting action or condition. Kaltâv, from Kermâni keletow, Malâyeri kallatow "wobbling," from kal, kalleh "head" + tâv, tow, tâb "swing, twist," from tâbidan "to twist, to spin." |
nutation in right ascension kaltâv-e râst-afrâz Fr.: nutation en ascension droite Same as → equation of the equinoxes. → nutation; → right ascension. |
nutator kaltâvgar, kaltâvandé Fr.: A drive mechanism used to move a radar beam in a circular, spiral, or conical path periodically. Agent noun of → nutate. |
nutrient fârmand Fr.: nutritif 1) Nourishing; providing nourishment or nutriment. From L. nutrientem, pr.p. of nutrire, → nourish. Fârmand, from present stem of fâridan, + -mand. |
nutriment fârâk Fr.: nourriture 1) Any substance or matter that, taken into a living organism, serves to sustain
it in its existence, promoting growth, replacing loss, and providing energy. From L. nutrimentum "nourishment; support," from nutrire, → nourish. Fârâk, from present stem of fâridan, → nourish, + -âk (as in xorâk, pušâk, etc.). |
nutrition fâreš Fr.: nutrition, alimentation 1) The act or process of nourishing or of being nourished. Verbal noun from L. nutrire, → nourish. |
nutritionist fârešgar Fr.: nutritioniste A person who is trained or expert in the science of nutrition. |
nutritive fârandé Fr.: nutritif, nourrissant 1) Serving to nourish; providing nutriment; nutritious. Adjective and agent noun from L. nutrire, → nourish. |
nyctalopia šabkuri (#) Fr.: nyctalopie Same as → night blindness; opposite of → hemeralopia. L.L. nyctalopia, from Gk. nukt, → night + al(aos) "blind" + -opia, akin to ope "view, look," ops "eye." Šabkuri, from šab, → night, + kuri "blindness," from kur, → blind. |
Nyquist formula disul-e Nyquist 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. Named after Harry Nyquist (1889-1976), a Swedish-born American physicist, who made important contributions to information theory. → Johnson-Nyquist noise; → formula. |
Nyquist frequency basâmad-e Nyquist Fr.: fréquence de Nyquist The highest frequency that can be determined in a Fourier analysis of a discrete sampling of data. → Nyquist formula; → frequency. |
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. |
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