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: 373
non-thermal spectrum
  بیناب ِ ناگرمایی   
binâb-e nâgarmâyi

Fr.: spectre non thermique   

A radio emission with a negative → spectral index. In this type of emission the intensity of the emitted radiation increases with wavelength.

non-thermal; → spectrum.

non-zero
  نا-صفر   
nâ-sefr

Fr.: non zéro, non nul   

Not equal to zero.

non-; → zero.

non-zero polynomial
  بلنامین ِ نا-صفر   
bolnâmin-e nâ-sefr

Fr.: polynôme non nul   

A → polynomial that at least has one non-zero → coefficient. See also → zero polynomial.

non-zero; → polynomial.

noncoherent scattering
  پراکنش ِ ناهمدوس   
parâkaneš-e nâhamdus

Fr.: diffusion incohérente   

The absorption of a photon and its re-emission at a different frequency (in the observer's frame of reference) by scattering atoms.

non-; → coherent scattering.

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.

nonempty
  ناتهی   
nâtohi (#)

Fr.: non vide   

Describing something that is partially or totally occupied.

non; → empty.

nonempty set
  هنگرد ِ ناتهی   
hangard-e nâtohi

Fr.: ensemble non vide   

A set containing at least → one → element.

nonempty; → set.

nonexistence
  ناهستومندی، ناهستی   
nâhastumandi, nâhasti

Fr.: non existence   

Math.: The fact that no → solution exists for a given → problem. In mathematics, nonexistence usually is a matter of impossibility.

non-; → existence.

nonfuzzy
  ناپرزوار   
nâporzvâr

Fr.: non flou   

Not → fuzzy. → nonfuzzy set.

non-; → fuzzy.

nonfuzzy set
  هنگرد ِ ناپرزوار   
hangard-e nâporzvâr

Fr.: ensemble non flou   

A set that obeys the rules of → classical logic, a → crisp set, as contrasted with a → fuzzy set.

nonfuzzy; → set.

nonholonomic system
  راژمان ِ ناهروداتیک   
râžemân-e nâharudâtik

Fr.: système non holonomique   

A mechanical system with constraints on their velocity that are not derivable from position constraints. Nonholonomic systems arise, for instance, in mechanical systems that have rolling contact (for example, the rolling of wheels without slipping) or certain kinds of sliding contact (such as the sliding of skates). They are a remarkable generalization of classical Lagrangian and Hamiltonian systems in which one allows position constraints only.

non-; → holonomic; → system.

nonhomogeneous
  ناهمگن   
nâhamgen (#)

Fr.: non homogène   

Not homogeneous. → nonhomogeneous linear differential equation.

non-; → homogeneous.

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.

nonlinear
  ناخطی   
nâxatti (#)

Fr.: non-linéaire   

Not a linear function of the relevant variables.
Containing a variable with an exponent other than one; opposite of → linear.

non-; → linear.

nonlinear device
  دستگاه ِ ناخطی   
dastgâh-e nâxatti

Fr.: dispositif non-linéaire   

An electronic device whose output is not directly proportional to its input. For example, in a → diode the current is a nonlinear function of the voltage; its voltage-current characteristics do not obey → Ohm's law.

nonlinear; → device.

nonlinear dynamics
  توانیک ِ ناخطی   
tavânik-e nâxatti

Fr.: dynamique non-linéaire   

Same as → chaos.

nonlinear; → dynamics.

nonlinear instability
  ناپایداری ِ ناخطی   
nâpâydâri-ye nâxatti

Fr.: instabilité non-linéaire   

The instability of a physical or mathematical system that arises from the nonlinear nature of relevant variables and their interactions within the system.

nonlinear; → instability.

nonlinear system
  راژمان ِ ناخطی   
râžmân-e nâxatti

Fr.: système non-linéaire   

A system in which small changes can result in large effects, and large changes in small effects.

nonlinear; → system.

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