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: 49 Search : near
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.

nonlinearity
  ناخطیگی   
nâxattigi

Fr.: non-linéarité   

The property, condition, or state of being → nonlinear.

non-; → linearity.

quasi-linear theory
  نگره‌ی ِ چونان-خطی   
negare-ye cunân-xatti

Fr.: théorie quasi-linéaire   

In plasma physics, the theory that considers the interactions between waves and particles are of first order only. It ignores all terms of second order in the fluctuating quantities.

quasi-; → linear; → theory.

rectilinear
  راست-خط   
râst-xatt (#)

Fr.: rectiligne   

In a straight line; consisting of straight lines. → curvilinear

From recti- combining form of rectus, → right, + → line + -ar, variant of the adjective-forming suffix → -al.

Râst-xatt, from râst, → right, + xattline.

rectilinear propagation of light
  توچش ِ راست‌خط ِ نور   
tuceš-e râst-xatt-e nur

Fr.: propagation rectiligne de la lumière   

The motion of light in the first approximation, as evidenced from the formation of shadows and other every day experience. However, → diffraction

rectilinear; → propagation; → light.

rectilinear system
  راژمان ِ راست‌خط   
râžmân-e râst-xatt

Fr.: système rectilinéaire   

An optical system that is corrected for → distortion and → spherical aberration and therefore forms the image of a straight line as a straight line.

rectilinear; → system.

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