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: 3106 Search : on
relaxation
  واهلش   
vâheleš (#)

Fr.: relaxation   

1) The evolution of the properties of a physical system which has been disturbed and which regains its equilibrium condition once the disturbing action has ceased. Relaxation is the response of the system to the perturbation. The time required by the system to regain its condition of minimum energy is called the → relaxation time.
2) Math.: In numerical analysis, a method of solving equations in which the errors, or residuals, resulting from an initial approximation are reduced by succeeding approximations until finally all are within the toleration limit.

Verbal noun of → relax.

relaxation time
  زمان ِ واهلش   
zamân-e vâhaleš

Fr.: temps de relaxation   

The characteristic length of time that is required for a system undergoing → relaxation to move to its equilibrium state. If the system follows an exponential law G = G0 exp(-t / τ), the relaxation time is the time required for G to obtain the fraction 1/e of its initial value G0.

relaxation; → time.

remote control
  دور-کنترول، کنترول از دور   
dur kontrol (#), kontrol az dur (#)

Fr.: commande à distance   

1) Control of the operation or performance of an apparatus from a distance, as the control of a guided missile by radio signals.
2) A device used to control the operation of an apparatus or machine, as a television set, from a distance.

remote; → control.

renormalization
  باز‌هنجارورش   
bâzhanjârvareš

Fr.: renormalisation   

A mathematical process used in quantum physics that avoids infinite terms by carefully defining fundamental quantities such as mass and charge.

re-; → normalization.

repetition
  بازگرش   
bâzgarš

Fr.: répétition   

The act of repeating; repeated action, performance, production, or presentation.

From L. repetitionem (nominative repetitio), from repetitus, p.p. of repetere "to do or say again."

Bâzgarš from bâz-, → re-, + garš "turn, time (indicating multiplication, as in three times, four times, etc.," aquivalent to Fr. fois), related to gez in hargez "ever, always; never," garz in hagarz "never." Garš has numerous variants in Pers. dialects, all denoting "turn, times" (بار، دفعه), e.g. [Mo'in]: gazak; Qâyeni: gaš; Hamadâni, Qomi: kaš; Lori: gey, gel; Semnâni, Sorxeyi, Lâsgardi, Sangesari: gazak; Gilaki: garaš; Tâleši: gara, vera, verxa; Tabari: gal, gel; Tâti Karingâni: kat; Kermâni: karet; related to Av. hakərət "once," from *ha(m)-kar-, the second element meaning "to do;" Pers; kardan; cf. Skt. sakrt "once, repeated; ever; never."

representation
  نمایش، نمایندگی   
nemâyeš (#), nemâyandegi (#)

Fr.: représentation   

1) The act or the action of representing; the state of being represented.
2) The expression by some term, character, symbol, or the like.

M.E. representacion, from L. repraesentation, from repraesentatus p.p. of repraesentare, from → re- + praesentare "to show, give, present for approval," from praesens, from praeesse "to be before others, to be present," from prae- "before," → pre- + esse "to be," cognate with Pers. ast "is," astan, hastan "to be."

Nemâyeš, nemâyandegi, from nemudan "to show, demonstrate, exhibit," → display

reproduction
  بازفر‌آورش   
bâzfarâvareš

Fr.: reproduction   

1) The act of reproducing or the condition or process of being reproduced.
2) Something reproduced, especially in the faithfulness of its resemblance to the form and elements of the original.
3) Biology: Any of various processes, either sexual or asexual, by which an animal or plant produces one or more individuals similar to itself (TheFreeDictionary.com).

reproduce; → -tion.

repulsion
  وازنش   
vâzaneš (#)

Fr.: répulsion   

Physics: The force that acts between bodies of like electric charge or magnetic polarity, tending to separate them.

Verbal noun of → repulse.

resignation
  واگامش   
vâgâmeš

Fr.: démision   

The act of resigning.

Verbal noun from → resign.

resolution
  واگشود   
vâgošud

Fr.: résolution   

1) The degree to which an → optical system renders visible separate parts of an object. Also known as → angular resolution and → spatial resolution. See also → spectral resolution.
2) The time interval between successive discernible signals. → temporal resolution.

Verbal noun of → resolve.

resolution of a force
  واگشود ِ نیرو   
vâgošud-e niru

Fr.: résolution de force   

Finding the → components of a → force which act in specified → directions.

resolution; → force.

resonance
  باز‌آوایی   
bâzâvâyi (#)

Fr.: résonance   

1) The state of a → mechanical system in which the → amplitude of → oscillation is increased when it is subjected to stimulus from another source at or near its own natural → frequency.
2) The condition of an electrical circuit with respect to a given frequency in which the net reactance is zero and the current flow a maximum.
3) A relationship in which the → orbital period of one body is related to that of another by a simple integer fraction, such as 1/2, 2/3, 3/5. → Laplace resonance, → Lindblad resonance, → resonance orbit .
4) → resonance particle.

Resonance, from M.Fr. resonance, from L. resonantia "echo," from resonare "to resound," from re- "again, back" + sonare "to sound."

Bâzâvâyi, from bâz- "again, back," → re-, + âvâ "voice, sound" (related to âvâz "voice, sound, song," bâng "voice, sound, clamour" (Mid.Pers. vâng), vâžé "word;" Av. vacah- "word," vaocanghê "to decalre" (by means of speech), from vac- "to speak, say;" cf. Skt. vakti "speaks, says," vacas- "word;" Gk. epos "word;" L. vox "voice;" PIE base *wek- "to speak") + -yi noun suffix.

resonance capture
  گیر-اُفت ِ باز‌آوایی   
gir-oft-e bâzâvâyi

Fr.: capture résonante   

Capture by an atomic nucleus of a particle whose energy is equal to one of the energy levels of the nucleus.

resonance; → capture.

resonance frequency
  بسامد ِ باز‌آوایی   
basâmad-e bâzâvâyi

Fr.: fréquence de résonance   

The frequency at which a system is in → resonance.

resonance; → frequency.

resonance line
  خط ِ باز‌آوایی   
xatt-e bâzâvâyi

Fr.: raie de résonance   

For a particular atom, the spectral line corresponding to the longest wavelength arising from a transition between the ground state and an excited state.

resonance; → line.

resonance orbit
  مدار ِ باز‌آوایی   
madâr-e bâzâvâyi

Fr.: orbite de résonance   

An orbit which is in → orbital resonance with another orbit.

resonance; → orbit.

resonance particle
  ذرّه‌ی ِ باز‌آوایی   
zarre-e bâzâvâyi

Fr.: particule de résonance   

A hadronic particle which exists for only a very brief time (10-23 seconds) before decaying into hadrons; also called resonance. The existence of a resonance cannot be observed directly; it can only be inferred from studying the longer-lived products of its decay.

resonance; → particle.

resonance region neutron
  نوترون ِ ناحیه‌ی ِ باز‌آوایی   
notron-e nâhiye-ye bâzâvâyi

Fr.: neutron dans la région de résonance   

A neutron with an energy between 1 eV and 0.01 MeV.

resonance; → region; → neutron.

resonant
  باز‌آوا   
bâzâvâ

Fr.: résonnant   

Pertaining to a system in a state of → resonance; producing resonance; resounding.

Verbal adj. from → resonate.

resonant circuit
  برقراه ِ باز‌آوا   
barqrâh-e bâzâvâ

Fr.: circuit résonnant   

An electrical circuit containing both capacitance and inductance in such a way that a certain periodic electric oscillation will reach maximum amplitude.

resonant; → circuit.

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