An Etymological Dictionary of Astronomy and Astrophysics
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فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory

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Number of Results: 12942 Search : far
electromagnetic
  برقامغناتی، برقامغناطی   
barqâmeqnâti

Fr.: électromagnétique   

Of or pertaining to electromagnetism or electromagnetic fields.

electro- + → magnetic

electromagnetic counterpart
  همتای ِ برقامغناتی   
hamtâ-ye barqâmeqnâti

Fr.: contrpartie électromagnétique   

An → electromagnetic signal associated with the location on the sky and the time of a → gravitational wave event. The electromagnetic signal is predicted by models to be associated with the → merger of a → compact binary star system composed of two → neutron stars (NS) or a neutron star and a → black hole (BH). Accordingly, the gravitational waves are accompanied by a short-duration → gamma-ray burst (GRB) powered by the → accretion of material that remains in a → centrifugally supported → torus around the BH following the merger. NS-NS/BH-NS mergers are also predicted to be accompanied by a more isotropic counterpart, commonly known as a → kilonova. Kilonovae are day to week-long thermal, → supernova-like → transients, and are powered by the → radioactive decay of heavy, neutron-rich elements synthesized by the → r-process in the expanding merger ejecta (Li and Paczynski 1998). The first detection of an electromagnetic counterpart to gravitational waves belongs to → GW170817.

electromagnetic; → counterpart.

electromagnetic field
  میدان ِ برقامغناتی   
meydân-e barqâmeqnâti

Fr.: champ électromagnétique   

A region of space consisting of coupled electric and magnetic lines of force at each point, generated by time-varying currents and accelerated charges.

electromagnetic; → field.

electromagnetic force
  نیروی ِ برقامغناتی   
niru-ye barqâmeqnâti

Fr.: force électromagnétique   

The fundamental force that is associated with electric and magnetic fields. One of the four fundamental forces of nature, it is carried by photons.

electromagnetic; → force.

electromagnetic induction
  درهازش ِ برقامغناتی   
darhâzeš-e barqâmeqnâti

Fr.: induction électromagnétique   

The production of an → electromotive force in a circuit caused by a variation in the magnetic flux through the circuit. If this variation is produced by a change in the current flowing in the circuit itself, it is called → self-induction. If due to the variation in a current in some other circuit, it is called mutual induction. See also → Faraday's law of induction.

electromagnetic; → induction.

electromagnetic potential
  توند ِ برقامغناتی   
tavand-e barqâmeqnâti

Fr.: potentiel électromagnétique   

The combination of both → electric scalar potential and → magnetic vector potential.

electromagnetic; → potential.

electromagnetic radiation
  تابش ِ برقامغناتی   
tâbeš-e barqâmeqnâti

Fr.: rayonnement électromagnétique   

Radiation propagating in the form of an advancing wave in electric and magnetic fields. It includes radio waves, infrared, visible light, ultraviolet, X-rays, and gamma rays.

electromagnetic; → radiation.

electromagnetic signal
  نشال ِ برقامغناتی   
nešâl-e barqâmeqnâti

Fr.: signal électromagnétique   

Information transmitted by means of a modulated current or an electromagnetic wave and received by telephone, radio, television, etc.

electromagnetic; → signal.

electromagnetic spectrum
  بیناب ِ برقامغناتی   
binâb-e barqâmeqnâti

Fr.: spectre électromagnétique   

The range of frequencies over which electromagnetic waves are propagated. → electromagnetic radiation.

electromagnetic; → spectrum.

electromagnetic theory
  نگره‌ی ِ برقامغناتی   
negare-ye barqâmeqnâti

Fr.: théorie électromagnétique   

The description of combined electric and magnetic fields mainly by → Maxwell's equations. Same as → electromagnetism.

electromagnetic; → theory.

electromagnetic theory of light
  نگره‌ی ِ برقامغناتی ِ نور   
negare-ye barqâmeqnâti-ye nur

Fr.: théorie électromagnétique de la lumière   

The theory describing light as a wave phenomenon resulting from the combination of two electric and magnetic fields vibrating transversely and mutually at right angles. → electromagnetic radiation; → electromagnetic wave; → Maxwell's equations.

electromagnetic; → theory; → light.

electromagnetic wave
  موج ِ برقامغناتی   
mowj-e barqâmeqnâti

Fr.: onde électromagnétique   

A wave produced by oscillation or acceleration of an electric charge. → electromagnetic radiation.

electromagnetic; → wave.

electromagnetism
  برقامغنات، برقامغناتیس   
barqâmeghnât, barqâmeghnâtis

Fr.: électromagnétisme   

1) The science dealing with the physical relations between → electricity and → magnetism. Same as → electromagnetic theory.
2) One of the four fundamental forces of nature, governing the electric and magnetic interaction between particles.

electro-; → magnetism.

electromotive force (EMF)
  نیروی ِ برقران   
niru-ye barqrân (#)

Fr.: force électromotrice   

The force, analogous to a pressure, which maintains a flow of electricity through a closed circuit. It is the algebraic sum of the → potential differences acting in the circuit. The unit of electromotive force is the → volt.

From → electro- + motive, from M.E., from M.Fr., from O.Fr. motif, from M.L. motivus "moving, impelling," from L. motus, p.p. of movere "to move," → motion; → force.

Niru, → force; barqrân, literally "driving electricity," from barq, → electro- + rân present stem of rândan, → drive.

electron
  الکترون   
elektron (#)

Fr.: électron   

The → elementary particle that possesses the smallest possible negative → electric charge. This structureless particle has an intrinsic → spin (1/2), a mass of 9.109 382 91 (40) x 10-31 kg, and an electric charge of 1.602 176 565(35) × 10-19 → coulombs, or 4.803 204 51(10) × 10-10 → esu.

Term first suggested in 1891 by Irish physicist G. J. Stoney (1826-1911); from electr-, from → electric + -on, a suffix used in the names of subatomic particles, probably extracted from → ion.

electron affinity
  کرونی ِ الکترونی   
karvani-ye elektroni

Fr.: affinité électronique   

The amount of energy released or absorbed in the process in which an electron is added to a neutral atom or molecule in gaseous state to form a negative ion.

electron; → affinity.

electron capture
  گیر‌افت ِ الکترون   
giroft-e elektron

Fr.: capture d'électron   

A process whereby an → unstable atom becomes stable. In this process, an → electron in an atom's inner shell is drawn into the → nucleus where it combines with a → proton, forming a → neutron and a → neutrino. The neutrino escapes from the atom's nucleus. The result is an element change, because the atom loses a proton. For example, an atom of → carbon (with 6 protons) becomes an atom of → boron (with 5 protons). Electron capture is also called K-capture since the captured electron usually comes from the atom's K-shell. See also → neutronization.

electron; → capture.

electron charge
  بار ِ الکترون   
bâr-e elektron (#)

Fr.: charge de l'électron   

The charge of one electron, e = -1.602 176 × 10-19coulombs or -4.803 204 51 × 10-10statcoulombs.

electron; → charge.

electron configuration
  همپیکرش ِ الکترونی   
hampeykareš-e elektroni

Fr.: configuration électronique   

Of an atom, a form of notation which shows how the electrons are distributed among the various atomic orbital and energy levels. The format consists of a series of numbers, letters and superscripts. For example, 1s2 2s2 2p3 means: 2 electrons in the 1s subshell, 2 electrons in the 2s subshell, and 3 electrons in the 2p subshell.

electron; → configuration.

electron degeneracy
  واگنی ِ الکترون   
vâgeni-ye elektron (#)

Fr.: dégénérescence des électrons   

A → degenerate matter in which electrons are very tightly packed together, as in a white dwarf, but cannot get closer than a certain limit to each other, because according to quantum mechanics laws (→ Pauli exclusion principle) the lowest energy levels can be occupied by only one electron. Therefore, electrons are forced into high energy states. And the significant pressure created by these high energy electrons supports white dwarf stars against their own gravity.

electron; → degeneracy.

<< < -es -iv -ti 21- A r abe abs abs acc acc acc act act ada adi adu aff age alc Alf ali all alp alt ama amp ana ang ang ann ano ant ant ape apo app aps arc Arg ari art ass ast ast ast atm ato att aur aut axi B r bac Bal Bar Bar Bay bec Ber Bet Bie bij bin bio bis bla bla blu blu bol Bor bou Bra bre bro Bug C-s cal Cam can car Car Cas cat cav cel cen cer Cha cha cha che cho cir cir cir cla clo clo clu coa coe coh col col col com com com com com com com com com con con con con con con con con con con con coo cor Cor cor cos cos cos Cou cou cra cre cro cru cub cur cyc Cyn dar dat day de- dec dec dec def def deg del den dep Des det deu dex die dif dif dil dip dir dis dis dis dis dis div dom Dor dou Dra duc dus dwa dyn e-t ear ecl eco eff Ein Ein ele ele ele ele ele elv emi emp ene enr epa epo equ equ Err Eta Eul eva evo exc exc exh exo exp exp ext ext Fab fai fan fau fel fer fic fil fin fir fla fli flu foc for for for fra fre fre fro fun fuz Gal gal gal Gar gau geg gen geo geo geo ger gla gly gra gra gra gra gra Gre gro GYR Had Hal hap Har HD hea hel hel hep Her hex hig Him hol hor hos hov Hub Hun hyd hyd hyd hyp IC ide ill Ima imp imp inc inc ind ine inf inf inf ini inp ins ins int int int int Int int int int inv ion Iri irr iso iso ite jel Jou JUp Kan Kep Kil kin Kra Lag Lam Lan Lar las law lea Leg Leo lev lig lim lin lin lin lit loc loc log Lor low lum lun lun Lym Mac mag mag mag mag mag mai Mal mar mas mas mat max mea mec meg men mer met met Met mic mid Mil min Mir mix mod mod mol mon mor mov mul mur n-b nan nat nea neg Ner neu new New NGC noc nom non non nor nou nuc nuc num O-p obl obs obs oce Of? ohm omn opa Oph opt opt or orb ord Ori ort osc out ove ozo pal pan par par par par pat pec pen per per per per per Pfu pha pho pho pho phy pie pla Pla pla pla pla plu poi pol pol pol pol por pos pot pow pre pre pre pre pri pri pri pro pro pro pro Pro pro Prz pul pum Pyx qua qua qua qua R A rad rad rad rad rad rad Ram Ran rat rea rea rec rec red red ref ref reg rei rel rel rem rep res res res ret rev rhy rif Rin rob Rom rot rot rum S s Sak San sav sca Sch Sch scr sec sec SED sei sel sem seq sex Sha she sho sid sig sil sim sin siz sla Sma SNR Sof sol sol sol sol sou sou spa spe spe spe spe sph spi spo squ sta sta sta sta ste ste ste sto sto str str sub sub sub sum sup sup sup sup sur sus sym syn syz tan tea tem ten ter the the the the thi thr tid til tip tom tor tou tra tra tra tra Tri tri tru tsu tur two Typ ult umb unc uni uni unk upp urg uvb val var Veg vel ver vib vio vir vis Voi vow wan wat wav WC wea wel whi Wil wir WNh wor X-r Yer Z s zer [C > >>