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: 33 Search : spectrum
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.

Planck spectrum
  بیناب ِ پلانک   
binâb-e Planck

Fr.: spectrum de Planck   

Same as → blackbody spectrum.

Planck; → spectrum.

power spectrum
  بیناب ِ توانی   
binâb-e tavâni (#)

Fr.: spectre de puissance   

The plot that gives the portion of a signal's power falling within given frequency bins. The most common way of generating a power spectrum is by using a discrete Fourier transform.

power; → spectrum.

prismatic spectrum
  بیناب ِ منشوری   
binâb-e manšuri

Fr.: spectre prismatique   

The spectrum formed by a dispersing prism or a dispersing prism system.

Adj. of → prism + → spectrum.

radiation spectrum
  بیناب ِ تابش   
binâb-e tâbeš

Fr.: spectre de rayonnement   

The components of radiation arranged in order of their wavelengths, frequencies, or quantum energies. For particle radiation they are arranged in order of their kinetic energies.

radiation; → spectrum.

radio spectrum
  بیناب ِ رادیویی   
binâb-e râdio-yi

Fr.: spectre radio   

That part of the → electromagnetic spectrum that includes → radio waves.

radio; → spectrum.

Rayleigh-Jeans spectrum
  بیناب ِ ریلی-جینز   
binâb-e Rayleigh-Jeans

Fr.: spectre Rayleigh-Jeans   

The part of → electromagnetic spectrum approximated by the → Rayleigh-Jeans law.

Rayleigh; → Jeans; → spectrum.

rectified spectrum
  بیناب ِ راستیده   
binâb-e râstidé

Fr.: spectre rectifié   

A spectrum after correction for detector's → baseline.

Rectified p.p. of → rectify; → spectrum.

rotation-vibration spectrum
  بیناب ِ چرخش-شیوش   
binâb-e carxeš-šiveš

Fr.: spectre rotation-vibration   

The spectrum of a molecule resulting from the simultaneous rotation and vibration of its constituent atoms.

rotation; → vibration; → spectrum.

solar spectrum
  بیناب ِ خورشید، ~ خورشیدی   
binâb-e xoršid (#), ~ xoršidi (#)

Fr.: spectre solaire   

The spectrum of the Sun's electromagnetic radiation, consisting of a continuum spectrum marked with dark absorption lines.

solar; → spectrum.

spark spectrum
  بیناب ِ اخگر، ~ جرقه   
binâb-e axgar, ~ jaraqé

Fr.: spectre d'étincelle   

The emission spectrum produced through a gas or vapor as a result of a high-voltage discharge between metallic electrodes.

spark; → spectrum.

spectrum
  بیناب   
binâb (#)

Fr.: spectre   

The → electromagnetic radiation divided into its constituting wavelengths or frequencies.

From L. spectrum "appearance, image, apparition," from specere "to look at, view;" Gk. skopein "to behold, look, consider," skeptesthai "to look at;" PIE base *spek- "to see;" cf. Av. spas-, spaš- "to attend to; to serve; spy," spasiieiti "looks at, perceives" (Mod.Pers. sepâs "kindness, favor, thanksgiving," sepâsidan "to praise for benefits received);" Skt. paś- "to see, watch," spasati "sees;" L. specere "to look at;" O.H.G. spehônn "to spy," Ger. spähen "to spy."

Binâb "a vision;" Mid.Pers. wênâb "vision," from wên-, present stem of didan "to see;" O.Pers. vain- "to see;" Av. vaēn- "to see;" cf. Skt. veda "I know;" Gk. oida "I know," idein "to see;" L. videre "to see;" PIE base *weid- "to know, to see."

visible spectrum
  بیناب ِ دیار، ~ دیدنی   
binâb-e diyâr, ~ didani

Fr.: spectre visible   

The portion of → electromagnetic spectrum corresponding to → visible light.

visible; → spectrum.

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