An Etymological Dictionary of Astronomy and Astrophysics
English-French-Persian

فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory

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A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

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Number of Results: 3079 Search : on
compilation
  هاتلش   
hâtaleš

Fr.: compilation   

The act of compiling; something compiled.

compile; → -tion.

complex conjugate
  همیوغ ِ همتافت   
hamyuq-e hamtâft (#)

Fr.: conjugé   

A → complex number in which the → real part of the number remains the same, but i is replaced by -i. For example, the complex conjugate of x + iy is x - iy. Same as → conjugate complex number.

complex; → conjugate.

complex fraction
  برخه‌ی ِ همتافت   
barxe-ye hamtâft

Fr.: fraction complexe   

A fraction in which the → numerator or → denominator, or both, contain fractions. For example (3/5)/(6/7). Also called → compound fraction.

complex; → fraction.

complex function
  کریای ِ همتافت   
karyâ-ye hamtâft

Fr.: fonction complexe   

A function whose → variables are → complex numbers.

complex; → function.

complex population
  پرینش ِ همتافت   
porineš-e hamtâft

Fr.: population complexe   

Same as → composite population.

complex; → population.

component
  همنه   
hamneh (#)

Fr.: composante   

A constituent part; an individual part of an organized whole.
One of two or more vectors having a sum equal to a given vector.

L. componentem, pr.p. of componere "to put together," → compose.

Hamneh from ham- "together," → com- + neh present tense stem of nehâdan "to put, place," → compose.

composite population
  پرینش ِ همنهاده   
porineš-e hamnehâdé

Fr.: population composite   

A stellar population consisting of more than one → simple population. Also called complex population.

composite; → population.

composition
  همنهش   
hamneheš (#)

Fr.: composition   

1) General: The act or manner of composing; the result or product of composing.
2) Chemistry: The proportion of the elements of which a substance is made up.
3) Mechanics: The determination of a force whose effect is the same as that of two or more given forces acting simultaneously.

Hamnehesh, from ham-, → com-, + neheš verbal noun from nehâdan "to put, place," → compose.

compound fraction
  برخه‌ی ِ همنات   
barxe-ye hamnât

Fr.: fraction composée   

Same as → complex fraction.

compound; → fraction.

compound proposition
  گزاره‌ی ِ همنات   
gozâre-ye hamnât

Fr.: proposition composée   

A statement formed from simple statements by the use of words such as "and," "or," "not," "implies," or their corresponding symbols.

compound; → proposition.

comprehension
  همنوتش   
hamnuteš

Fr.: compréhension   

1) The ability to → comprehend something.
2) In logic, the sum of all the essential attributes which analysis can find in a concept or term. For example, the comprehension of the term man is rational animal; the → extension of the term man, is all men and women. Comprehension and extension are inversely proportional. The greater is the comprehension of a term, the less is its extension.

Verbal noun of → comprehend.

compression
  تنجش   
tanješ (#)

Fr.: compression   

The act or process of compressing; the state of being compressed.

Verbal noun from → compress.

compression factor
  کروند ِ تنجش   
karvand-e tanješ

Fr.: facteur de compression   

In thermodynamics, the quantity Z = pVm/RT, in which P is the gas pressure, Vm the molar volume, R the gas constant, and T the temperature. The compression factor is a measure of the deviation of a real gas from an ideal gas. For an ideal gas the compression factor is equal to 1.

compression; → facteur.

compression wave
  موج ِ تنجش   
mowj-e tanješ

Fr.: onde de compression   

A → longitudinal wave that compresses the → medium along the direction of → propagation, such as a → sound wave. Same as → compressional wave.

compression; → wave.

compressional
  تنجشی   
tanješi (#)

Fr.: de compression   

Of or relating to → compression.

compression; → -al.

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.

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