An Etymological Dictionary of Astronomy and Astrophysics
English-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 nâjabri

Fr.: 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-farin

Fr.: 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'âyi

Fr.: 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 radiation.

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-hamkubeši

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.

non-; → collisional; → plasma.

nondimensional equation
  هموگش ِ ناوامونی   
hamugeš-e nâvâmuni

Fr.: 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 nâhamgen

Fr.: 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 hanjârmand

Fr.: 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 hanjârvar

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.

normal; → distribution.

normalization
  هنجارورش   
hanjârvareš

Fr.: 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-yi

Fr.: combustion nucléaire   

nuclear burning.

nuclear; → combustion.

nuclear cross-section
  سکنج‌گاه ِ هسته‌ای   
sekanjgâh-e hasteyi

Fr.: 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-yi

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.

nuclear; → fusion.


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