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: 13116 Search : far
information content
  پربنه‌ی ِ ازدایش   
parbane-ye azdâyeš

Fr.: contenu d'information   

The → negative of the → logarithm of the → probability that a particular → message or → symbol will be emitted by a → source.

information; → content.

information entropy
  درگاشت ِ ازدایش   
dargâšt-e azdâyeš

Fr.: entropie de l'information   

The measure of information, which is usually expressed by the average number of bits needed for storage or communication. In other words, the degree to which the values of a → random variable X are dispersed. If the → probability density function of X is P(x), the entropy is defined by: H(X) = -Σ P(x) log P(x). Also called → Shannon entropy.

information; → entropy.

information flow
  تچان ِ ازدایش   
tacân-e azdâyeš

Fr.: flot d'information   

The flow of data into a system or to the end users.

information; → flow.

information paradox
  پارادخش ِ ازدایش   
pârâdaxš-e azdâyeš

Fr.: paradoxe de l'information   

A paradox raised in 1976 by S. Hawking (1942-2018) whose analysis of the thermodynamic properties of → black holes led him to the prediction that black holes are not in fact black, but radiate due to quantum effects. This implied that, due to the → Hawking radiation, a black hole would eventually evaporate away, leaving nothing. This deduction presented a problem for → quantum mechanics, which maintains that information can never be lost. This topic is a matter of intense debate. Many solutions have been proposed, but all of them have serious drawbacks. In order to analyze better these solutions one needs a quantum gravity theory, which does not exist at the moment. In brief, either the idea of → quantum unitarity must be given up, or a mechanism should be found by which information is not lost after it falls into a black hole.

information; → paradox.

information science
  دانش ِ ازدایش، ازداییک   
dâneš-e azdâyeš azdâyik (#)

Fr.: informatique   

Same as → informatics.

information; → science.

information technology
  تشنیک‌شناسی ِ ازدایش   
tašnik-šenâsi-ye azdâyeš

Fr.: technologie de l'informtion   

The science and activity of receiving, storing, processing, and transmitting information by using → computers.

information; → technology.

information theory
  نگره‌ی ِ ازدایش   
negare-ye azdâyeš (#)

Fr.: théorie de l'information   

The mathematical theory that defines, quantifies, and analyzes the concept of → information. It involves → probability theory in → transmission of → messages when the → bits of information are subject to various distortions. Its goal is to enable as much information as possible to be reliably stored on a medium, retrieved, or communicated.
See also:
information content, → information entropy, → information flow, → information paradox, → information science, → information theory, → quantum information, → entropy.

information; → theory.

informative
  ازدامند   
azdâmand

Fr.: informatif   

Giving → information, providing information, imparting → knowledge.

From informat-, from L. informatus, from → inform + → -ive.

informer
  ازداگر   
azdâgar

Fr.: informateur   

A person who provides → information.

From → inform + -er, → -or.

infosphere
  ازداسپهر   
azdâsepehr

Fr.: infosphère   

The global network of all the world's communications, databases, and sources of information.

information; → sphere.

infra-
  فرو-   
foru-

Fr.:infra-   

A prefix meaning "below," used with second elements of any origin. → infrared; → infrasound.

From L. infra "below, underneath, beneath," from PIE *ndher; cf. Mod.Pers. zir "below, down," akin to → under-.

Foru-, from foru "down, downward; below; under, beneath; low," from Mid.Pers. frôt "down, downward;" O.Pers. fravata "forward, downward;" cf. Skt. pravát- "a sloping path, the slope of a mountain."

infrared
  فروسرخ   
forusorx (#)

Fr.: infrarouge   

The invisible part of electromagnetic spectrum possessing wavelengths between those of visible light and those of radio waves, i.e. approximately between about 0.75 and 1000 μm.

From L. infra (adv., prep.) "below, underneath, beneath," inferus "lower," from PIE *ndher; cf. Av. aδara- (adj.), aδairi- (prep.) "below;" Mid.Pers. êr "below, down; low, under," adar "low," azêr "below, under" (Mod.Pers. zir "below, down"); Skt. ádhara- "lower;" O.E. under "under, among"); → red.

Forusorx, from foru "down, downward; below; beneath;" Mid.Pers. frôt "down, downward;" O.Pers. fravata "forward, downward;" cf. Skt. pravát- "a sloping path, the slope of a mountain," + sorxred.

infrared array
  آرست ِ فروسرخ   
ârast-e forusorx

Fr.: détecteur mosaïque infrarouge   

A two-dimensional infrared imaging device, consisting of an array of small, individual electronic detectors, each of which records a pixel in the image.

infrared; → array.

Infrared Astronomical Satellite (IRAS)
  ماهواره‌ی ِ اخترشناختی ِ فروسرخ   
mâhvâre-ye axtaršenâxti-e forusorx (#)

Fr.: satellite astronomique infrarouge   

An orbiting infrared telescope (60 cm mirror) which successfully operated from launch in January 1983 until the supply of coolant ran out in November 1983. It was a collaborative mission between NASA, the Netherlands, and the UK, and mapped 95% of the whole sky in the wavelength bands 12, 25, 60, and 100 microns.

infrared; → astronomical; → satellite.

infrared astronomy
  اخترشناسی ِ فروسرخ   
axtaršenâsi-ye forusorx (#)

Fr.: astronomie infrarouge   

The study of infrared properties of astronomical objects.

infrared; → astronomy.

infrared camera
  کدک ِ فروسرخ   
kadak-e forusorx

Fr.: caméra infrarouge   

An optical camera equipped with a → detector which is sensitive to → infrared radiation.

infrared; → camera.

infrared cirrus
  سیروس ِ فروسرخ   
sirus-e forusorx (#)

Fr.: cirrus infrarouge   

Wispy, extended structures seen above and below the plane of the Galaxy in the infrared maps of the sky (60-100 microns) produced by the → Infrared Astronomical Satellite (IRAS).

infrared; L. cirrus "curl, tuft, plant filament like a tuft of hair."

infrared dark cloud (IRDC)
  ابر ِ تاریک ِ فروسرخ   
abr-e târik-e forusorx

Fr.: nuage sombre infrarouge   

A → dark cloud characterized by a → visual extinction Av≥ 102 mag. IRDCs are opaque even at 8 μm, and can be seen in silhouette against the bright diffuse → mid-infrared emission in the → interstellar medium.

infrared; → dark; → cloud.

infrared detector
  آشکارگر ِ فروسرخ   
âškârgar-e forusorx (#)

Fr.: détecteur infrarouge   

A thermal device for observing and measuring → infrared radiation.

infrared; → detector.

infrared emission
  گسیل ِ فروسرخ   
gosil-e forusorx

Fr.: émission infrarouge   

The portion of → electromagnetic radiation from → astrophysical objects in → infrared frequencies.

infrared; → emission.

<< < -es -iv -ti 21 a p abe abs abs aca acc acc acr act ada adh Adr aer aga air Alf Alg alk Alp alt alu amm ana And ang ani ano ant ant Ap apo app app Aqu Arc arg arr asc ass ast ast asy atm ato att aur aut axi B-m bad Bal bar bar Bay Bed ber Bet bif bim bin bio bis bla ble blu Bod Bol bor bou Bra Bre bro bul C-t Cal Cam can car Car Cas cat cav cel cen cer Cha cha Cha che chl Cir cir cir Cla cli clo clu co- coc 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 Cre cri cro cub cur cyc cyl Dan dat Dav de- Deb dec dec dee def deg del Den den der det deu dew dic dif dif dil Dip dir dis dis dis dis dis diu dod Dop dou Dra dua dus dwa dyn DZ Ear ecc eco edi EHB Ein ela ele ele ele ele ell eme emp end Eng ent epi equ equ era ESP eth Eur evi exa exc exe exi exp exp ext ext ext fac fal far fec Fer fer fie fin fir fis fla Flo flu fog for for Fou fra fre fre Fro fun G s 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 Hen Her hex hig Hil hol Hoo hor hou Hub hum hyb hyd hyd hyp hys ide ign ima imp imp in- inc Ind ind ine inf inf inf ini ins ins ins int int int int Int int int int inv ion iri irr iso iso iso Jea Jor jum K c Kep Ker kin kno lab Lam Lan Lap las lat Le lef len lev lig lig lin lin lin liq Lit loc log lon lou LS lun lun Lym M s Mag mag mag mag mag mag maj man Mar mas mas mat May mea mec mel mer mes met met met mic mid mil Min Mir mix mod mod mol mon mor mov mul mur mys nan nat nav nec Nep neu New New NGC nob nom non non nor nos nuc nuc num nut obj obl obs occ oct off oli oni ope opp opt opt orb ord org orp osc out ove oxi P-w pal par par par par Pas pat pej per per per per per per pha Phe pho pho pho phy pin pla Pla pla pla pla plu poi pol pol Pol pol por pos pot Poy pre pre pre pre pri pri pri pro pro pro pro pro pro Psa pul pum Q i 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 Rho Rie ril riv rog Ros rot rul S A Sag sam sat sca sca Sch Sco Sec sec sec seg sel sem sen set Sha sha shi sho sid sig sim sin Sir ske sli Smo soc sof sol sol sol sol sou sou spa spe spe Spe spe sph spi Spi spr sta sta sta sta sta ste ste ste Sto str str sub sub sub suc sun sup sup sup sup sur swa syn syn tac tas tel tem ter tes the the the the thi thr tid til tip ton tor tou tra tra tra tra Tri tri tru tsu tur two Typ UHE ult unc uni uni uni upg 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 > >>