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: 13176 Search : far
radio source
  رادیو-خن، خن ِ رادیویی   
râdio-xan, xan-e râdioyi

Fr.: radio source, source radio   

A point or small portion of the sky giving stronger radio emission than the sky in its vicinity.

radio; → source.

radio spectrum
  بیناب ِ رادیویی   
binâb-e râdio-yi

Fr.: spectre radio   

That part of the → electromagnetic spectrum that includes → radio waves.

radio; → spectrum.

radio star
  رادیو-ستاره، ستاره‌ی ِ رادیویی   
râdio setâré, setâre-ye râdioyi

Fr.: étoile radio   

A star which is a source of emission at radio frequencies. Radio stars include pulsars, flare stars, binary star systems in which mass is transferred from one component to the other, and some X-ray stars.

radio; → star.

radio storm
  توفان ِ رادیویی   
tufân-e radioyi (#)

Fr.: orage radio   

Strong radio frequency radiation from the Sun, occurring in association with eruptions of solar flares or other causes of solar activity.

radio; → storm.

radio Sun
  خورشید ِ رادیویی   
xoršid-e râdioyi (#)

Fr.: Soleil radio   

The image of the Sun obtained from its electromagnetic radiation in radio frequencies. The apparent size of the radio Sun depends of the frequency of the signal, since different radio frequencies originate from various atmospheric layers of the Sun.

radio; → sun.

radio survey
  بردید ِ رادیویی   
bardid-e râdio-yi

Fr.: relevé radio   

A map or series of images of a region of sky obtained in → radio wavelengths of the → electromagnetic radiation.

radio; → survey.

radio telescope
  رادیو-تلسکوپ، تلسکوپ ِ رادیویی   
râdio-teleskop (#), teleskop-e râdioyi (#)

Fr.: radio télescope   

A telescope whose receiver is sensitive to → radio waves.

radio; → telescope.

radio wave
  موج ِ رادیویی   
mowj-e râdioyi (#)

Fr.: ondes radio   

The → electromagnetic radiation with the longest → wavelengths (and lowest energies), ranging from 0.3 mm to several km. Radio waves form a very broad category, which includes the → submillimeter waves (with a wavelength of 0.3-1 mm) and → microwave regions (1 mm to several cm).

radio; → wave.

radio wavelength
  موج-طول ِ رادیویی   
mowjtul-e râdioyi

Fr.: longueur d'onde radio   

The → electromagnetic radiation with a wavelength ranging from 1 mm to several 100 km. See so → radio wave.

radio; → wavelength.

radio window
  روزنه‌ی ِ رادیویی   
rowzane-ye râdioyi (#)

Fr.: fenêtre radio   

A range of electromagnetic radiation in the radio frequencies to which the Earth's atmosphere is transparent.

radio; → window.

radio-loud quasar
  کو‌آسار ِ رادیویی ِ خروشان   
kuâsâr-e râdioyi-ye xorušân

Fr.: quasar puissant en radio   

A quasar that has the same characteristics as a → radio-quiet quasar with the addition of having strong radio emissions.

radio; loud, from O.E. hlud "making noise;" cf. M.Du. luut, Du. luid, O.H.G. hlut, Ger. laut "loud;" → quasar.

Kuâsâr, → quasar; râdioyi, adj. of → radio; xorušân "shouting aloud, roaring," from xorušidan "to shout, cry aloud, roar;" Mid.Pers. xrôšitan "to shout."

radio-quiet quasar
  کو‌آسار ِ رادیویی ِ آرام   
kuâsâr-e râdioi-ye ârâm

Fr.: quasar faible en radio   

A type of quasar with weak radio emission. These types of quasars have strong emissions in both the optical and X-ray spectra. Within the optical spectrum, both broad and narrow emission lines are present. Their host is usually an elliptical galaxy, but less commonly, it might be a spiral. → radio-load quasar.

radio; quiet, M.E., from O.Fr. quiete, from L. quies (genitive quietis) "rest, quiet;" → quasar.

Kuâsârquasar; → radio; ârâm "quiet" (Mid.Pers. râm "peace," râmenidan "to give peace, pleasure," râmišn "peace, pleasure;" Av. ram- "to stay, rest;" cf. Skt. ram- "to stop, stand still, rest, become appeased;" Gk. erema "quietly, gently;" Goth. rimis "rest;" Lith. rãmas "rest").

radioactive
  پرتو-ژیرا   
partow-žirâ

Fr.: radioactive   

Possessing, or pertaining to, → radioactivity.

radio + → active.

radioactive dating
  سن‌یابی ِ پرتو-ژیرا   
sen yâbi-ye partow-žirâ

Fr.: datation radioactive   

Determining the age of an object from the → radioactive decay of its constituting material. The technique consists of comparing the → abundance ratio of a → radioactive isotope to its → decay product. This will yield the number of half-lives that have occurred since the sample was formed. More specifically, if an object is made up of 50 % decay product then it has gone through 1 → half-life. 75% decay product equals 2 half-lives, 87.5% decay product equals 3 half-lives, 93.76% decay product equals 4 half-lives, and so on. For example, the decay product of → uranium-238 (238U) is → lead-206 (206Pb). The half-life of 238U is 4.5 billion years. Hence, if the sample has gone through two half-lives, it is 9 billion years old. See also: → radiocarbon dating.

radioactive; → dating.

radioactive decay
  تباهی ِ پرتو-ژیرا   
tabâhi-ye partow-žirâ

Fr.: désintégration radioactive   

Spontaneous emission by a nucleus of photons or particles.

radioactive; → decay.

radioactive isotope
  ایزوتوپ ِ پرتو-ژیرا   
izotop-e partow-žirâ

Fr.: isotope radioactif   

A → nuclide that is radioactive.

radioactive; → isotope.

radioactive nuclide
  هسته‌وار ِ پرتو-ژیرا   
hastevâr-e partowžirâ

Fr.: nucléide radioactif   

A → nuclide that disintegrates by emitting radiation and transforms into another nuclide. Same as → radionuclide.

radioactive; → nuclide.

radioactive waste
  آخال ِ پرتو-ژیرا   
âxâl-e partow-žirâ

Fr.: déchets radioactifs   

The radioactive by-products from the operation of a nuclear reactor or from the reprocessing of depleted nuclear fuel. Also known as nuclear waste.

radioactive; → waste.

radioactivity
  پرتو-ژیرایی، پرتو-ژیرندگی   
partow-žirâyi, partow-žirandegi

Fr.: radioactivité   

The spontaneous disintegration of certain atomic nuclei, which is accompanied by the emission of either α- or β- particles and/or a γ rays.

radio; → activity.

radiocarbon
  پرتو-کربون   
partow-karbon

Fr.: radiocarbone   

A → radioactive → isotope of → carbon, especially → carbon-14.

radio; → carbon


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<< < -es -it -sc 201 951 abe abs abs aca acc acc aco act ada adh ado aer aft air Alf alg alk alp Alt alt amb ana And ang ani ann ant ant ant apo app app Apu arc arg Arn art ass ast ast ast atm ato att aur aut avo azi bac bal bar bar bat Bea Bel bet bia big bin bio Bir bla bla blo Blu bol Boo bou box bre Bri bro bur cal cal Can cap car Car cat cau cel cen cen cha Cha cha che Chi chr cir cir civ cla clo clo CMB 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 con coo cor cor cor Cos cos cos cou cou cra cri cro cry cul cur cyc D l dar dat day dea dec dec dec def def deg Del Den dep der det deu dew dic dif dif dil dip dir dis dis dis dis dis diu dog Dop dou Dra Dsc dus dwa dyn Dys Ear ecc eco edg egg Ein Ela ele ele ele ele ell eme emp enc eng ent epi equ equ equ eru eth Eur eve exa exc exe exi exo exp ext ext ext fab fai Fan fea fem fer fie fil fir fir fla fli flu foc for for for fra fre fre fri fun fuz gal gal gal Gam gau Gau gen geo geo geo geo Gib glo gov gra gra gra gra gre gro Gui H-a hal Ham har Hay hea hei hel Hel her het hie hig hoa hom hor hot Hub Hug hur hyd hyd hyl hyp ice ide ima ima imp imp inc inc ind ine inf inf inf ing inn ins ins int int int int int int int int inv inv ion iro Isl iso iso Jab jet Jov Jup Kar Kep kil Kip 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 map mas mas mat Mau mea mea med Men mer Mes Met met mic mic Mie mil min Mir mix mod mol mom Moo mor mov mul mur n-b nan nat nea neg Ner neu new New NGC noc nom non non nor nor nuc nuc nul nut obj obl obs occ oct off old one ope opp opt opt orb ord org Ori osc oth ove Owl P-s Pal par par par par Pas pat pec pen per per per per per Pha pha pho pho pho phy pie pix Pla pla pla pla Pli Poi pol pol pol pol por pos pos pow pre pre pre pre pri pri pri pro pro pro pro pro pro pro pub pul pyc qua qua qua qua qui rad rad rad rad rad rad rai ran rar Ray rea Rea rec rec red red ref ref reg rel rel rel ren res res res res ret rev Ric rig rin roc roo rot rot rur S5- Sal sat sca sca Sch sci Scu sec sec sed sel sel sem seq set sha she sho sid sie sil sim sin sit sky slo sno sod sol sol sol sol son sou spa spa spe spe spe spe sph spi spo squ sta sta sta sta ste ste ste Sti sto str str sub sub sub sul sup sup sup sup sur sur syl syn sys tal Tay tel ten ter tex the the the the Tho thr tid tim Tit too Tor tra tra Tra tra Tra tri Tri tru tub tur two Typ ult ult unc uni uni uni upl ura uti val var vec vel ver Ver vie vir vis vis vol W-R war wav wav wea Wei wha wid win WN3 Wol wri xen yok zen zij > >>