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: 1259
competitive accretion model
  مدل ِ فربال ِ پیشی‌جویانه   
model-e farbâl-e piši-juyâné

Fr.: modèle d'accrétion compétitive   

A scenario for → massive star formation whereby developing → protostars in their natal → molecular clouds compete with each other to gather mass. The protostars → accrete mass with a rate which depends on their location within the protocluster. They use the same reservoir of gas to grow. Therefore those protostars nearest the center, where the potential well is deep, and gas densities are higher, have the highest → accretion rates. The competitive accretion model explains the observational fact that the most massive stars are generally found in cluster cores. It accounts also for the distribution of stellar masses. In this model the accretion process depends on the content of the cluster. In clusters where gas dominates the potential (e.g. at initial stages of cluster formation), the accretion process is better modeled by using the → tidal radius as the accretion radius. In contrast, when the stars dominate the cluster potential and are virialized, the accretion is better modeled by → Bondi-Hoyle accretion (Bonnell et al. 1997, MNRAS 285, 201; 2001, MNRAS 323, 785).

competitive; → accretion; → model..

competitor
  پیشی‌جو   
piši-ju

Fr.: compétiteur   

A person, team, company, etc., that competes; rival (Dictionary.com).

compete + → -or.

compilation
  هاتلش   
hâtaleš

Fr.: compilation   

The act of compiling; something compiled.

compile; → -tion.

compile
  هاتلیدن   
hâtalidan

Fr.: compiler   

1) To put together (documents, selections, or other materials) in one book or work.
2) Computers: To translate (a computer program) from a high-level language into another language, usually machine language, using a → compiler (Dictionary.com).

M.E., from O.Fr. compiler "compile, collect," from L. compilare "to plunder, rob," probably originally "bundle together, heap up;" from → com- "together" + pilare "to fix firmly, accumulate."

Hâtalidan, from hâ- variant of ham-, → com-, + tal, → pile, + -idan suffix of infinitives.

compiler
  هاتلگر   
hâtalgar

Fr.: compilateur   

A → software program that compiles program source code files into an executable program.

compile + → -er

complement
  اسپران   
osporân

Fr.: complément   

1) Math., logic: With reference to any set A, conceived as a subset of some larger set U, all the elements of U that are not contained in A.
2) Optics: A complementary color that, when combined to another, creates neutral gray.

From O.Fr. complement, from L. complementum "that which fills up or completes," from complere "fill up," → complete.

Osporân, from ospor present tense stem of osporidan "to → complete."

complementarity
  اسپرندگی   
osporandegi

Fr.: complémentarité   

The state or quality of being → complementary.

From → complementary + → -ity.

From osporandé, → complementary, + -gi, same as -i noun suffix.

complementarity principle
  پروز ِ اسپرندگی   
parvaz-e osporandegi

Fr.: principe de complémentarité   

Physical principle, put forward by Niels Bohr in 1928, that a complete knowledge of phenomena on atomic dimensions requires a description of both wave and particle properties.

complementarity; → principle.

complementary
  اسپرنده   
osporandé

Fr.: complémentaire   

Forming or serving as a complement; completing.

From → complement.

complementary angle
  زاویه‌ی ِ اسپرنده   
zâviyé-ye osporandé

Fr.: angle complémentaire   

Any angle that when added to another one creates a 90° angle.

complementary; → angle.

complementary apertures
  دهانه‌های ِ اسپرنده   
dahânehâ-ye osporandé

Fr.: ouvertures complémentaires   

Same as → complementary screens.

complementary; → aperture.

complementary screens
  پرده‌های ِ اسپرنده   
pardehâ-ye osporandé

Fr.: écrans complémentaires   

Two apertures where opaque and transparent areas are inverted. If A is an aperture that has some opaque areas and some transparent ones, the complementary pattern A' is the pattern in which exactly the opposite areas are opaque and transparent. Thus, the complimentary screen of a single slit is a wire of the same size, and the complementary screen of a circular opening is a dot. A better term would be → complementary apertures.

complementary; → screen.

complete
  ۱) اسپر؛ ۲) اسپریدن   
1) ospor; 2) osporidan

Fr.: 1) complet; 2) compléter   

1a) General: Having all necessary parts, elements, or steps.
1b) Math: Of a deductive theory or system, the property that every statement formulated in terms of the theory can be either proved or disproved.
2) To make whole or entire; to make perfect.

From O.Fr. complet "full," from L. completus, p.p. of complere "to fill up," from → com- + plere "to fill," PIE *pelu- "full," from *pel- "to be full;" cf. O.Pers. paru- "much, many," Av. parav-, pauru-, pouru-, par- "to fill," Mod.Pers. por "full," Skt. puru-, Gk. polus.

1) Ospor, from Mid.Pers. uspurr "complete, entire," from prefix us-, os-, → ex-, + por "full," O.Pers. paru- "much, many," Av. parav-, pauru-, pouru-, par- "to fill," PIE *pelu- "full," from *pel- "to be full;" cf. Skt. puru-, Gk. polus, O.E. full "completely, full," from P.Gmc. *fullaz, O.H.G. fol, Ger. voll, Goth. full.
2) From ospor + -idan infinitive suffix.

complete graph
  نگاره‌ی ِ اسپر   
negâre-ye ospor

Fr.: graphe complet   

In → graph theory, a simple graph with an → edge between every pair of → vertices.

complete; → graph.

complete set
  هنگرد ِ اسپر   
hangard-e ospor

Fr.: ensemble complet   

Quantum mechanics: A set of states such that any state can be represented as a superposition of them.

complete; → set.

completeness
  اسپری   
ospori

Fr.: complétude   

1) The state of being complete and entire.
2) Logic: The condition of a → formal system if every → valid  → inference is → provable by means of the rules of the system.

From → complete + → -ness.

completeness magnitude
  برز ِ اسپری   
borz-e ospori

Fr.: magnitude de complétude   

In photometric studies of a → population of astronomical objects (usually stars or galaxies), the magnitude that represents the faintest members of the population.

completeness; → magnitude.

complex
  همتافت   
hamtâft (#)

Fr.: complexe   

1) General: (n. & adj.) A whole comprised of many elements. → complex wave.
2) (adj.) Complicated and hard to solve.
3) Math: Pertaining to or using → complex numbers.

From Fr. complexe, from L. complexus "surrounding, encompassing," p.p. of complecti "to embrace, encompass, include," from → com- "together" + plectere "to weave, twine."

Hamtâft, from ham- "together," → com- + tâft past stem of tâftan, tâbidan "to twist, to spin, to bend, to crook," p.p. tâftah "spun, silk or linen cloth," loaned into E. taffeta (from O.Fr. taffetas, from It. taffeta); similarly Gk. tapetion "little carpet" is probably from this Iranian origin (from which tapestry, tapis); Proto-Ir. *tap- "to spin," related to tan-, tanidan "to spin; to stretch," → tension.

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 dynamical variable
  ورتنده‌ی ِ توانیک ِ همتافت   
vartande-ye tavânik-e hamtâft

Fr.: variable dynamique complexe   

A → dynamical variable which has an → imaginary number part.

complex; → dynamical; → variable.

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