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: 12948 Search : far
upgrade
  ۱) فراز-پداک؛ ۲) فراز-پداکیدن   
1) farâz-padâk; 2) farâz-padâkidan

Fr.: 1) rampe, montée; 2) promouvoir, revaloriser   

1a) An incline going up in the direction of movement.
1b) An increase or improvement.
1c) A new version, improved model, etc.
2a) To promote to a higher grade or rank.
2b) To improve or enhance the quality or value of (Dictionary.com).

up; → grade.

uplift
  بالامد   
bâlâmad

Fr.: surrection   

The process by which an area of Earth's crust slowly rises either due to increasing upward force applied from below or decreasing downward force (weight) from above.

From → up + → lift.

Bâlâmad, literally "coming up," from bâlâ, → up, + âmad past stem of âmadan, → come.

upload
  ۱) بارگذاشتن؛ ۲) بارگذاری   
1) bârgozâštan; 2) bârgozâri (#)

Fr.: 1) mettre en ligne; 2) mise en ligne   

To send data from one's computer to another computer. See also: → loading, → download.

up-; → load.

Bârgozâštan, literally "to put load," from bâr, → load, + gozâštan "to put, to place," → passage.

upper
  بالا، زبرین   
bâlâ (#), zabarin (#)

Fr.: supérieur   

Higher, as in place, position, pitch, or in a scale.

Upper, from → up, → hyper-.

Bâlâ, → up; zabarin, → superior.

upper arm
  بازو   
bâzu (#)

Fr.: haut du bras   

The part of the → arm between the → shoulder and the → elbow.

upper; → arm.

Bâzu "arm," from Mid.Pers. bâzûk "arm;" Av. bāzu- "arm;" Mod.Pers. bâhu "stick, staff; arm;" cf. Skt. bāhu- "arm, forearm;" Gk. pechys "forearm, arm, ell;" O.H.G. buog "shoulder;" Ger. Bug "shoulder;" Du. boeg; O.E. bôg, bôh "shoulder, bough;" E. bough " a branch of a tree;" PIE *bhaghu- "arm").

upper atmosphere
  هواسپهر ِ زبرین، جو ِ ~   
havâsepehr-e zabarin, javv-e ~

Fr.: atmosphère supérieure   

The general term applied to the atmosphere above the → troposphere.

upper; → atmosphere.

upper culmination
  بالست ِ زبرین   
bâlest-e zabarin

Fr.: culmination supérieure   

Same as → superior culmination.

upper; → culmination.

upper level
  تراز ِ بالا، ~ زبرین   
tarâz-e bâlâ (#), ~ zabarin (#)

Fr.: niveau supérieur   

In atomic physics, an initial energy state in an emission transition.

upper; → level.

upper limit
  حدِ بالا، ~ زبرین   
hadd-e bâlâ (#), ~ zabarin (#)

Fr.: limite supérieure   

Of an integral operator, the point at which the integration ends.

upper; → limit.

upper main sequence
  رشته‌ی ِ فریست ِ زبرین   
rešte-ye farist-e zabarin

Fr.: séquence principale supérieure   

A → main sequence star with a mass above 1.5 Msun. Upper main sequence stars have high central temperatures so that they produce their energy through the → CNO cycle. The outward energy flux is very high and therefore this flux cannot be maintained by → radiative transfer. Thus, upper main sequence stars have → convective cores. Outside the core, there is a → radiative zone. The mass of the convective core gradually diminishes as the hydrogen is consumed. The surface hydrogen is fully ionized and the → opacity is due to → electron scattering The opacity due to electron scattering.

upper; → main; → sequence.

upper mantle
  گوشته‌ی ِ زبرین   
gušte-ye zabarin

Fr.: manteau supérieur   

The upper part of the Earth's → mantle which begins at the base of the → crust around 35 km and extends downward to about 410 km.

upper; → mantle.

upper mass cut-off
  بره‌ی ِ بالایی ِ جرم، ~ زبرین ِ ~   
bore-ye bâlâyi-ye jerm, ~ zabarin-e ~

Fr.: coupure aux masses élevées   

Same as → upper mass limit.

upper; → mass; → cut-off.

upper mass limit
  حد ِ بالایی ِ جرم، ~ زبرین ِ ~   
hadd-e bâlâyi-ye jerm, ~ zabarin-e ~

Fr.: limite supérieure de masses   

The highest mass range admitted in a star formation model. The high mass end of the → initial mass function. The upper mass limit is a critical parameter in understanding → stellar populations, → star formation, and → massive star feedback in galaxies.

upper; → mass; → limit.

upper transit
  گذر ِ زبرین   
gozar-e zabarin (#)

Fr.: passage supérieur   

The movement of a celestial body across a celestial meridian's upper branch. Same as → upper culmination.

upper; → transit.

upstream
  فرازاب   
farâzâb (#)

Fr.: en amont   

1) Toward or in the higher part of a stream; against the current. → downstream
2) Directed upstream; situated upstream.

up; → stream.

Farâz, → height; water, → water.

uranium
  اورانیوم   
urâniyom (#)

Fr.: uranium   

A → radioactive metallic → chemical element; symbol U. → Atomic number 92; → atomic weight 238.0289; → melting post 1,132 °C; → boiling point 3,818°C; → specific gravity 19.1 at 25 °C. Uranium has 14 known → isotopes of which 238U is the most abundant in nature. This isotope (→ half-life 4.5 billion years) is 138 times more abundant than 235U (half-life 710 million years). The metal was first isolated by the French chemist Eugène-Melchior Peligot in 1841. See also: → uranium oxide, → uranium conversion, → uranium dioxide, → uranium enrichment, → uranium hexafluoride, → uranium-233, → uranium-235, → uranium-238, → plutonium, → fissile isotope, → fertile isotope, → yellowcake.

From the name of the planet → Uranus. The German chemist Martin-Heinrich Klaproth discovered the element in 1789, following the German/English astronomer William Hershel's discovery of the planet in 1781.

uranium conversion
  هاگرد ِ اورانیوم   
hâgard-e urâniom

Fr.: convesrion de l'uranium   

A chemical process converting the → yellowcake to → uranium hexafluoride. The uranium hexafluoride is heated to become a gas and loaded into cylinders. When it cools, it condenses into a solid.

uranium; → conversion.

uranium dioxide
  دی‌اکسید ِ اورانیوم   
dioksid-e urâniyom

Fr.: dioxyde d'uranium   

A black crystalline solid (UO2pitchblende, carnotite, and autunite and is used chiefly as a source of nuclear energy by fission of the radioisotope uranium-235. After the → uranium hexafluoride is enriched, a fuel fabricator converts it into uranium dioxide powder and presses the powder into fuel pellets.

uranium; → dioxide.

uranium enrichment
  پُردارش ِ اورانیوم   
pordâreš-e urâniyom

Fr.: enrichissement de l'uranium   

The process by which the percentage of → fissile uranium in a sample is increased. Uranium obtained from mining contains several → isotopes of uranium in different compositions, such as U-238 (~99%), U-235 (~0.7%), and U-234 (~0.02%). Among them, U-235 is the only one that is fissile, i.e. can be used in a → nuclear reactor to produce heat (and consequently electricity) in a controlled manner. As such, the concentration of U-235 as a fuel used in a reactor needs to be increased, which is done using several techniques, such as → gaseous diffusion.

uranium; → enrichment.

uranium hexafluoride
  هگزافلویءورید ِ اورانیوم   
hegzâfluorid-e urâniyom

Fr.: hexafluorure d'uranium   

A white solid compound (UF6) of → uranium and → fluorine obtained by chemical treatment of → yellowcake, forming a vapor at temperatures above 56 °C. It contains both of the naturally occurring → isotopes of uranium U-235 and U-238. The isotopes are separated on the basis of differences in their diffusion properties. UF6 is the process medium for all separation processes for → uranium enrichment. It is essential that fluoride be a pure element and therefore solely the mass differences of U-235 and U-238 determine the separation process.

uranium; → hexa-; → fluoride.

<< < -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 cri cro cub cur cyc cyl dar dat daw de- Deb dec dec dee def deg del Den dep der det deu dew dic dif dif dil dip dir dis dis dis dis dis div dog Dop dou dra dua dus dwa dyn e-m ear ecl eco eff ein Ein elb ele ele ele ele Els emi emp ene enr env epi equ equ Eri est Euc eva evo exc exc exh exo exp exp ext ext f-n Fah fam fau fee Fer fib fil fin fir fix fle flu foc for for for fra fre fre fri fun fuz gal gal gal Gan gau GCN gen geo geo geo geo Gl glo gra gra gra gra gra gre gro GW1 hab hal han HAR haz hea hel hel Hen Her heu Hig Hil hol hop hor hou Hub Hum Hyd hyd hyd hyp hys ide ign ima imp imp inc inc ind ine inf inf inf inh INP ins ins int int int int Int int int int inv ion iri irr iso iso iso Jea Jos Jun K2 Kep key kin Kol lag lam Lan lar las lav lea leg len lev lig lim lin lin lin lis lob loc log lor low lum lun lun Lym Mac mag mag mag mag mag mai Mal mar mas mas mat max mea mea mee Men mer met met met mic mid Mil min Mir mix mod mod mol mon Mor mou mul muo mys nan nat nav nec Nep neu New New NGC nob nom non non nor not nuc nuc num Nyq obj obs obs oce oen OH omn opa ope opt opt opt orb ord Ori ort osc out ove oxy pal pan par Par par par pas pea Pen per per per per per pet pha pho pho pho phy pie Pit Pla pla pla pla ple Poi pol pol pol pol pop pos pos pow pre pre pre Pre pri pri pri pro pro pro pro pro pro Pro pub pul pyr qua qua qua qua Qui rad rad rad rad rad rad ram ran rat rea rec rec rec red ref ref reg reg rel rel rem rep res res res ret rev rho Rie rim riv rol Ros rot rul S a Sah san Sat sca Sch Sch scr sec sec sec sei sel sem sep set sha she sho sid sig sil sim sin sit sky slu sno sof sol sol sol sol sou sou spa spa spe spe spe sph spi spl spr sta sta sta sta sta ste ste sti sto str str sub sub sub sug sun sup sup sup sup sur syl syn sys tal Tay tel ten ter tex the the the thi tho thu tid tim tod top tot tra tra tra tra tri tri tro tru tur twi Typ UFO ult unc uni uni uni upg ura uti val var vec vel ver ver vig vir vis voc von wak Was wav wax wea wei whi Wie win WN6 wom X-r yel you zer zod > >>