# An Etymological Dictionary of Astronomy and AstrophysicsEnglish-French-Persian

## فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

### M. Heydari-Malayeri    -    Paris Observatory

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Number of Results: 1965 Search : ion
 non-algebraic function   کریای ِ ناجبری   karyâ-ye nâjabriFr.: fonction non algébrique   A → transcendental function. Examples are: exponential, logarithmic, and trigonometric functions.→ non-; → algebraic + → function. non-coherent radiation   تابش ِ ناهمدوس   tâbeš-e nâhamdus (#)Fr.: rayonnement incohrént   Radiation having waves that are out of phase in space and/or time; radiation which is not → coherent.→ non-; → coherent; → radiation. non-ionized   نایونیده   nâyonidé (#)Fr.: non ionisé   Not ionized, → neutral.→ non-; → ionized. non-principal axis (NPA) rotational motion   جنبش ِ چرخشی به گرد ِ آسه‌ی ِ نا-فرین   jonbeš-e carxeši be gerd-e âse-ye nâ-farinFr.: mouvement rotationnel autour de l'axe non-parincipal   A → tumbling motion of an → asteroid. See also → tumbling asteroid.→ non-; → principal axis; → rotational; → motion. non-radial pulsation   تپش ِ ناشعاعی   tapeš-e nâšo'âyiFr.: pulsation non-radiale   A type of stellar pulsation in which waves run in different directions on and beneath the surface of a star.→ non-; → radial; → pulsation. non-thermal emission   گسیل ِ ناگرمایی   gosil- nâgarmâyi (#)Fr.: émission non thermique   → non-thermal; → emission. non-thermal radiation   تابش ِ ناگرمایی   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.→ non-thermal; → radiation. noncollisional plasma   پلاسمای ِ نا-همکوبشی   pelâsmâ-ye nâ-hamkubešiFr.: 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.→ non-; → collisional; → plasma. nondimensional equation   هموگش ِ ناوامونی   hamugeš-e nâvâmuniFr.: équation non-dimensionnelle   An equation that is independent of the units of measurement as it only involves nondimensional numbers, parameters, and variables.→ non-; → dimensional; → equation. nonhomogeneous linear differential equation   هموگش ِ دگرسانه‌ای ِ خطی ناهمگن   hamugeš-e degarsâne-yi-ye xatti nâhamgenFr.: équation différentielle linéaire non homogène   A → linear differential equation if Q(x)≠ 0 on interval I.→ nonhomogeneous; → linear; → differential; → equation. nonionized   نایونیده   nâyonidé (#)Fr.: non-ionisé   The quality of an atom that has neither lost nor gained any electrons.→ non-; → ionized. normal dispersion   پاشش ِ هنجارمند   pâšeš-e hanjârmandFr.: dispersion normale   The dispersion in which a shorter wavelength is associated with a higher → refractive index. Contrasted with the → anomalous dispersion.→ normal; → dispersion. normal distribution   واباژش ِ هنجارور   vâbâžeš-e hanjârvarFr.: 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.→ normal; → distribution. normalization   هنجارورش   hanjârvarešFr.: normalisation   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. 2) Process of introducing a numerical factor into an equation so that the area under the corresponding graph (if finite) shall be made equal to unity. 3) To change in scale so that the sum of squares or the integral of squares of the transformed quantity is zero.Verbal noun of → normalize. notation   نمادگان   namâdgân (#)Fr.: notation   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. notion   پنداره   pendâré (#)Fr.: notion   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. nuclear combustion   سوزش ِ هسته‌ای   suzeš-e haste-yiFr.: combustion nucléaire   → nuclear; → combustion. nuclear cross-section   سکنج‌گاه ِ هسته‌ای   sekanjgâh-e hasteyiFr.: section efficace nucléaire   Apparent cross-section possessed by an atomic nucleus when it undergoes a particular type of collision process.→ nuclear; → cross section. nuclear fission   شکافت ِ هسته‌ای   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.→ nuclear; → fission. nuclear fusion   ایوش ِ هسته‌ای   iveš-e haste-yiFr.: 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.→ nuclear; → fusion.