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: 1234
compressional wave
  موج ِ تنجشی   
mowj-e tanješi

Fr.: onde de compression   

An → elastic wave that travels through a → medium with the particles of the medium moving in the same direction as the wave propagation. The compressional wave is the wave that is primarily used in → seismic exploration. Also called P-wave, primary wave, pressure wave.

compressional; → wave.

Compton
  کامپتون   
Compton

Fr.: Compton   

The American physicist Arthur Holly Compton (1892-1962), the Nobel Prize in Physics 1927, who made important contributions to the study of X- and cosmic rays.
Compton catastrophe, → Compton effect, → Compton equation, → Compton era, → Compton recoil, → Compton scattering, → Compton shift, → Compton suppression, → Compton wavelength, → Comptonization.

Compton catastrophe
  نگونزار ِ کامپتون   
negunzâr-e Compton

Fr.: catastrophe de Compton   

In a compact, steady radio-source where the density of relativistic electrons and the density of synchrotron radiation due to these electrons are very large, the radio photons should be transformed into X-ray and gamma-ray photons through inelastic Compton scatterings onto the relativistic electrons. Thus the radio photons should rapidly disappear and only gamma-ray photons should be observed. This phenomenon does not take place if the radio source is in relativistic expansion.

Compton; → catastrophe.

Compton effect
  اسکرِ کامپتون   
oskar-e Compton

Fr.: effet Compton   

Increase in the wavelength (reduction in the energy) of an → X-ray or → gamma ray  → photon when it collides a → free → electron.

Compton; → effect.

Compton equation
  هموگشِ کامپتون   
hamugeš-e Compton

Fr.: équation de Compton   

Theoretical equation which gives the change in the photon wavelength due to the → Compton effect.

Compton; → equation.

Compton era
     
dowrân-e Compton

Fr.: ère de Compton   

A period in the early evolution of the Universe, before t = 10-23 sec when the radius of curvature of the Universe was less than the → Compton wavelength of typical particles.

Compton; → era.

Compton recoil
  پسزنیِ کامپتون   
paszani-ye Compton

Fr.: recul de Compton   

The change of direction undergone by the electron in the → Compton effect. The scattered photon and the collided electron move in different directions from that of the incident photon.

Compton; → recoil.

Compton scattering
  پراکنشِ کامپتون   
parâkaneš-e Compton (#)

Fr.: diffusion Compton   

Scattering of a → photon due to the → Compton effect.

Compton; → scattering.

Compton shift
  کیبِ کامپتون   
kib-e Compton

Fr.: décalage de Compton   

Of the → Compton effect, the amount of increase in the wavelength of an energetic photon upon its collision with an electron.

Compton; → shift.

Compton suppression
  نهاوش ِ کامپتون   
nehâveš-e Compton

Fr.: suppression de Compton   

In → gamma ray → spectroscopy, a technique to reduce the contribution of gamma rays generated by → Compton scattering.

Compton; → suppression.

Compton wavelength
  موج-طول ِ کامپتون   
mowjtul-e Compton, tul-e mowj-e ~

Fr.: longueur d'onde de Compton, longueur d'onde Compton   

The quantum wavelength of a particle with a highly relativistic velocity. The Compton wavelength is given by h/mc, where h is Planck's constant, m is the mass of the particle, and c the light speed. For an electron, the Compton wavelength is about 2.4 × 10-10 cm, intermediate between the size of an atomic nucleus and an atom.

Compton; → wavelength.

Comptonization
  کامپتونش   
Kâmptoneš

Fr.: comptonisation   

The change in the → spectrum of → electromagnetic radiation due to → scattering from → electrons. When → photons and electrons coexist in the same volume of space, their → collisions can → transfer energy from photons to electrons (→ Compton effect) or from electrons to photons (→ inverse Compton effect).

Verbal noun of → Comptonize; → -tion.

Comptonize
  کامپتونیدن   
Kâmptonidan

Fr.: comptoniser   

The verb describing the → Camptonization process.

Compton; → -ize.

Comptonized emission
  گسیل ِ کامپتونیده   
gosil-e Kâmptonidé

Fr.: émission comptonisée   

Emission undergone → Comptonization.

Comptonize; → emission.

computation
  حساب   
hesâb (#)

Fr.: calcul   

The act, process, or method of calculating.

Verbal noun of → compute.

compute
  حسابیدن   
hesâbidan (#)

Fr.: calculer   

To determine by calculation, especially by numerical methods; to determine by using a computer or calculator. See also → calculate.

From Fr. computer, from L. computare "to count, sum up," from → com- "with" + putare "to prune, clean, settle an account, think over, reflect;" PIE base *pau- "to cut, strike, stamp."

Hesâbidan, from Ar. hesâb "reckoning, computation," + infinitive suffix -idan.

computer
  رایانگر   
râyângar (#)

Fr.: ordinateur   

An electronic device which can accept data, apply a series of logical instructions rapidly, and supply the results of the processes as information.

From → compute + suffix → -er.

Râyângar "arranger, organizer," on the model of Fr. ordinateur according to which the electronic device arranges/organizes instructions and information. Râyângar, from râyân- stem of râyânidan "to regulate, set in order," from Mid.Pers. râyânīdan "to arrange, organize" + -gar agent suffix. Râyân-, from rây-, Mod.Pers. ârây-, ârâyeš, ârâyidan "to arrange, adorn," Mid.Pers. ârây-, ârâstan "to arrange, adorn;" O.Pers. rād- "to prepare," rās- "to be right, straight, true," rāsta- "straight, true" (Mod.Pers. râst "straight, true"); Av. rāz- "to direct, put in line, set," razan- "order;" Gk. oregein "to stretch out;" L. regere "to lead straight, guide, rule," p.p. rectus "right, straight;" Skt. rji- "to make straight or right, arrange, decorate;" PIE base *reg- "move in a straight line;" see also → direct.

computerization
  رایانگرش، رایانگرانش   
râyângareš, râyângarâneš

Fr.:   

The process or state of computerizing.

computerize.

computerize
  رایانگریدن، رایانگراندن   
râyângaridan, râyângarândan

Fr.:   

To control, perform, process, or store by means of or in an electronic computer or computers.

From → computer + verb forming suffix → -ize.

concave
  کاو   
kâv (#)

Fr.: concave   

Of a surface, curving inward.

From L. concavus "hollow," from → com- intensive prefix + cavus "hollow;" PIE base *keu- "a swelling, arch, cavity."

Kâv "hollow," verb kâvidan (kâftan) "to dig; to examine, investigate," cf. L. cavus "hollow" (E. derivatives: cavity, concave, cave, excavate), Gk. koilos "hollow," Armenian sor; PIE *kowos "hollow."

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