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Fr.: fonction non algébrique
A → transcendental function. Examples are: exponential, logarithmic, and trigonometric functions.
tâbeš-e nâhamdus (#)
Fr.: rayonnement incohrént
Radiation having waves that are out of phase in space and/or time; radiation which is not → coherent.
Fr.: non ionisé
Not ionized, → neutral.
non-principal axis (NPA) rotational motion
jonbeš-e carxeši be gerd-e âse-ye nâ-farin
Fr.: mouvement rotationnel autour de l'axe non-parincipal
Fr.: pulsation non-radiale
A type of stellar pulsation in which waves run in different directions on and beneath the surface of a star.
gosil- nâgarmâyi (#)
Fr.: émission non thermique
tâbeš-e nâgarmâyi (#)
Fr.: rayonnement non thermique
The electromagnetic radiation whose characteristics do not depend on the temperature of the emitting source. In contrast to → thermal radiation, it has a different spectrum from that of → blackbody radiation. The three common types of non-thermal radiation in astronomy are: → synchrotron radiation, → bremsstrahlung radiation, and → maser → stimulated emission.
Fr.: plasma non-collisionnel:
A plasma in which the → mean free path of the charged particles between two collisions is much larger than the size of the system containing the plasma.
Fr.: équation non-dimensionnelle
An equation that is independent of the units of measurement as it only involves nondimensional numbers, parameters, and variables.
nonhomogeneous linear differential equation
hamugeš-e degarsâne-yi-ye xatti nâhamgen
Fr.: équation différentielle linéaire non homogène
A → linear differential equation if Q(x)≠ 0 on interval I.
The quality of an atom that has neither lost nor gained any electrons.
Fr.: dispersion normale
Fr.: distribution normale
A theoretical frequency distribution for a set of variable data, usually represented by a bell-shaped curve with a mean at the center of the curve and tail widths proportional to the standard deviation of the data about the mean. Same as → Gaussian distribution.
1) A mathematical technique for adjusting a series of values (typically representing a set of
measurements) according to some transformation function in order to make
them comparable with some specific point of reference.
Verbal noun of → normalize.
Representation of numbers, quantities, or other entities by symbols; a system of symbols for such a purpose.
From L. notationem (nom. notatio) "a marking, explanation," from notatus, p.p. of notare "to note."
Namâdgân, from namâd, → symbol, + -gân suffix denoting order, organization, multiplicity.
A general understanding; vague or imperfect conception or idea of something.
From L. notio "concept, conception, idea," from noscere "to know," → knowledge.
Pendâré, noun from pendâštan "to imagine, consider, think," → imaginary number.
Fr.: combustion nucléaire
Fr.: section efficace nucléaire
Apparent cross-section possessed by an atomic nucleus when it undergoes a particular type of collision process.
šekâft-e haste-yi (#)
Fr.: fission nucléaire
A → nuclear reaction in which a heavy atomic nucleus splits into two or more approximately equal parts, usually as the result of the capture of a slow, or → thermal neutron by the nucleus. It is normally accompanied by the emission of further neutrons or → gamma rays and very large amounts of energy. The neutrons can continue the process as a → chain reaction, so that it becomes the source of energy in a → nuclear reactor or an atomic bomb. It may also be a trigger for → nuclear fusion in a hydrogen bomb. Fission occurs spontaneously in nuclei of uranium-235, the main fuel used in nuclear reactors.
Fr.: fusion nucléaire
A → nuclear reaction between atomic nuclei as a result of which a heavier → atomic nucleus is formed, a small fraction of mass is lost, and a large quantity of energy is released. Nuclear fusion is the source of the energy of stars.