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Fr.: réaction nucléaire
A process in which the energy, composition, or structure of an atomic nucleus changes.
Fr.: transmutation nucléaire
The changing of atoms of one element into those of another by suitable nuclear reactions.
nulling fraction (NF)
Fr.: fraction de phase d'arrêt
number system conversion
hâgard-e râžmân-e adadi
Fr.: conversion de système de numération
The conversion of a → number system
with a given → base to another system with a
different base; such as the conversion of a → decimal number
(base 10) to a → binary number system
In order to convert a number into its representation in a different
number base, we have to express the number in terms of powers of the other base.
For example, to convert the decimal number 100 to base 3, we must figure out how to
express 100 as the sum of powers of 3. We proceed as follows:
mânandeš-e adadi, hamânand sâzi-ye ~
Fr.: simulation numérique
Another name for → numerical modeling.
1) 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
Fr.: nutation en ascension droite
Same as → equation of the equinoxes.
Fr.: nutrition, alimentation
1) The act or process of nourishing or of being nourished.
Verbal noun from L. nutrire, → nourish.
A person who is trained or expert in the science of nutrition.
Fr.: association OB
A loosely bound grouping of O and B stars that typically stretches up to several hundred → light-years and may contain between a dozen and several hundred → O stars and → B stars. The members of an OB association are young and of roughly the same age. OB associations dissipate in a few tens of millions of years.
O and B, from spectral types; → association.
1) The act of objecting.
Verbal noun of → object.
1) Something by which a person is bound or obliged to do certain things,
and which arises out of a sense of duty or results from custom, law,
M.E. obligacioun, from O.Fr. obligacion "obligation, duty, responsibility," from L. obligationem "an engaging or pledging," literally "a binding," noun of action from p.p. stem of obligare "to bind, bind up, bandage," from → ob- "to" + ligare "to bind," from PIE root *leig- "to bind."
Fariz, from Mid.Pers. frêz "obligation; duty."
1) The act of obscuring.
1) Act or instance of observing; → observe.
Verbal noun of → observe.
Pertaining to, or founded on observation, especially based on observation rather than theory.
Adj. of → observation.
Fr.: astrophysique observationnelle
That part of astrophysics that is mainly concerned with the collection of observational data, in comparison with theoretical astrophysics
Fr.: biais observationnel
An error in observation arising from systematically favoring brighter or weaker objects or some particular object morphologies; e.g. → Malmquist bias.
Fr.: cosmologie observationnelle
The application of observational data to the study of the Universe as a whole.
Fr.: effet observationnel
A feature appearing in an observation, which is not intrinsic to the object observed, but is due to the inappropriate method used (e.g. limited angular resolution).