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: 12934 Search : far
infrared radiation
  تابش ِ فروسرخ   
tâbeš-e forusorx (#)

Fr.: rayonnement infrarouge   

That part of the → electromagnetic radiation lying beyond the red, between the radio and the visible regions of the → electromagnetic spectrum. The wavelengths range from about 0.8 → microns (μm) to about 1000 μm. See also: → near-infrared; → mid-infrared; → far-infrared; → submillimeter radiation.

infrared; → radiation.

Infrared Space Observatory (ISO)
  نپاهشگاه ِ فضایی ِ فروسرخ   
nepâhešgâh-e fazâyi-ye forusorx

Fr.: Satellite ISO   

A European Space Agency satellite which carried the most sensitive infrared telescope ever launched. It operated between November 1995 and April 1998 and made particularly important observations of the dusty regions of the Universe. ISO was equipped with four science instruments: an infrared camera (CAM), a long-wavelength spectrometer (LWS), a photo-polarimeter (PHT), and a short-wavelength spectrometer (SWS). The instruments jointly covered wavelengths from 2.5 to around 240 microns with spatial resolutions ranging from 1.5 arcseconds to 90 arcseconds. Its 60 cm diameter telescope was cooled by superfluid liquid helium to temperatures of 2-4 K. The mission was a great technical, operational and scientific success. During its routine operational phase, ISO successfully made some 30,000 individual imaging, photometric, spectroscopic, and polarimetric observations ranging from objects in our own solar system to the most distant extragalactic sources.

infrared; → space; → observatory.

infrared survey
  بردید ِ فروسرخ   
bardid-e forusorx

Fr.: relevé infrarouge   

Observing a large area of sky (or the whole sky) in infrared wavelengths.

infrared; → survey.

infrared telescope
  دوربین ِ فروسرخ، تلسکوپ ِ ~   
durbin-e forusorx (#), teleskop-e ~ (#)

Fr.: télescope infrarouge   

A telescope capable of observing → infrared radiation from astronomical objects.

infrared; → telescope.

infrared window
  روزنه‌ی ِ فروسرخ   
rowzane-ye forusorx (#)

Fr.: fenêtre infrarouge   

A range of infrared wavelengths to which the Earth's atmosphere is relatively transparent, and at which observations can be made from the ground. Infrared windows are found near wavelengths of 1.25, 1.65, 2.2, 3.6, 5.0, 10, 20, and 30 microns, and beyond 300 microns.

infrared; → window.

infrasound
  فروصدا   
forusedâ

Fr.: infra-son   

A sound wave whose frequency is below the audible range of about 20 → Hz to 20,000 Hz. → sound wave; → ultrasound; → subsonic.

infra- + → sound.

ingredient
  درانه   
darâné

Fr.: ingrédient   

That which enters into a → compound or → mixture.

M.E., from L. ingredient- (nominative ingrediens) "that which enters into," p.p. of ingredi "to go in, enter," from → in- + gradi "to go, to walk," → egress.

Darâné, literally "brought into," from dar-, → in-, + ân present stem of ânidan "to bring, to lead," → relate, + nuance suffix .

ingress
  درونگام   
darungâm

Fr.: immersion   

Same as → immersion.

From → in- + gress, → egress.

inherit
  ریگن بردن، دریگیدن   
rigan bordan, darigidan

Fr.: hériter   

To take or receive (property, a right, a title, etc.) by succession or will, as an → heir (Dictionary.com).

heritage.

inheritable
  ریگن‌بردنی، دریگیدنی   
riganbordani, darigidani

Fr.: dont on peut hériter, qui peut hériter   

1) Capable of being inherited.
2) Capable of inheriting; qualified to inherit (Dictionary.com).

inherit; → -able.

inheritance
  ریگن‌برد، ریگنبرد، دریگش   
riganbord, darigeš

Fr.: hériter   

1) Something that is or may be inherited; property passing at the owner's death to the heir or those entitled to succeed; legacy; something, as a quality, characteristic, or other immaterial possession, received from progenitors or predecessors as if by succession.
2) The genetic characters transmitted from parent to offspring, taken collectively.
3) The act or fact of inheriting by succession, as if by succession, or genetically (Dictionary.com).

Verbal noun of → inherit.

inheritor
  ریگن‌بر، ریگنبر   
riganbar

Fr.: héritier   

A person who → inherits; → heir.

inherit; → -or.

inhomogeneity
  ناهمگنی   
nâhamgeni (#)

Fr.: inhomogénéité   

The condition or an instance of not being homogeneous.

in- "not" + → homogeneity.

inhomogeneous
  ناهمگن   
nâhamgen (#)

Fr.: inhomogène   

Lack of homogeneity; something that is not → homogeneous.

in- "not" + → homogeneous.

initial
  آغازین   
âqâzin (#)

Fr.: initial   

Of, pertaining to, or occurring at the beginning.

Initial, from L. initialis, from initium "a beginning, an entrance," from p.p. stem of inire "to go into, begin," from → in- + ire "to go," → ion.

Âqâzin "pertaing to the beginning," from âqâz "beginning," from Proto-Iranian *āgāza-, from prefix ā- + *gāz- "to take, receive," cf. Sogdian āγāz "beginning, start," pcγz "reception, taking."

initial conditions
  بوتارهای ِ آغازین   
butârhâ-ye âqâzin

Fr.: conditions initiales   

1) Conditions at an initial time t = t0 from which a physical system or a given set of mathematical equations evolves.
2) Meteo.: A prescription of the state of a → dynamical system at a specified time; for all subsequent times, the → equation of motion and → boundary conditions determine the state of the system.

initial; → condition.

initial mass
  جرم ِ آغازین   
jerm-e âqâzin (#)

Fr.: masse initiale   

The mass of a star at its arrival on the → main sequence.

initial; → mass.

initial mass function (IMF)
  کریا‌ی ِ آغازین ِ جرم   
karyâ-ye âqâzin-e jerm

Fr.: fonction initiale de masse   

A mathematical expression describing the relative number of stars found in different ranges of mass for a cluster of stars at the time of its formation. It is defined as φ(log M) = dN / dlog M ∝ M, where M is the mass of a star and N is the number of stars in a logarithmic mass interval. The value of the slope found by Salpeter (1955) for → low-mass and → intermediate-mass stars in the → solar neighborhood is Γ = 1.35. The IMF can be expressed also in linear mass units: χ(M) = dN / DM ∝ M. Note that χ(M) = (1 / M lm 10) φ(log M), and α = Γ + 1. In this formalism the Salpeter slope is α = 2.35. There is a third way for representing the IMF, in which the exponent is x = -α. The IMF is not a single power law over all masses, from → brown dwarfs to → very massive stars (Kroupa, 2002, Science 295, 82). Different slopes have been found for different mass segments, as follows: α = 1.3 for 0.08 ≤ Msolar < 0.5; α = 2.3 for 0.5 ≤ Msolar < 1; α = 2.3 for 1 ≤ Msolar. The IMF at low masses can be fitted by a → lognormal distribution (See Bastian et al., 2010, ARAA 48, 339 and references therein). See also → canonical IMF.

initial; → mass; → function.

initial phase angle
  زاویه‌ی ِ فاز ِ آغازین   
zâviye-ye fâz-e âqâzin

Fr.: angle de phase initial   

The value of the phase corresponding to the origin of time. Same as the → epoch angle.

initial; → phase; → angle.

initial singularity
  تکینی ِ آغازین   
takini-ye âqâzin (#)

Fr.: singularité initiale   

An instant of infinite density, infinite pressure, and infinite temperature where the equations of general relativity break down, if the standard Big Bang theory is extrapolated all the way back to time zero. → singularity.

initial; → singularity.

<< < -es -iv -ti 217 A s abe abs abs acc acc Ach act act ADa adi adv aff age Alc Alf ali all alp alt ama amp ana ang ang ann ano ant ant ape apo app aps arc Arg arm art ass ast ast ast atm ato att aur aut axi B-t Bai Bal bar bar Be bed Bes BHB bif bim bin Bio bis bla ble blu bod Bol bor bou bra Bre bro Bul cag cal can Can car Car Cas cat CCD cel cen Cet cha cha che che chr cir cir cit 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 cri cro cry cum cur cyc d'A dar dat DB dea dec dec dec def def deh del den dep des det deu dia dif dif dif dim dip Dir dis dis dis dis dis div dom dou dou dri duo dus dyn dyn ear eas ecl Edd eff Ein eje ele ele ele ele ell emb emi enc ene ent eph equ equ equ eru eth Eul eve ewe exc exc exi exo exp ext ext ext fab fal far fec Fer fer fie fin fir fis fla Flo flu fog for for Fou fra fre Fre fro fus G t gal gal Gam gas Gau Gem gen geo geo geo gia gla God gra gra gra gra Gre Gre gue GZK Haf hal har har He hea hel hel Her Her hid hig hip hom hor hot Hub Hug hur hyd hyd hyg hyp ice ide ima imp imp imp inc ind ind ine inf inf inf ini ins ins int int int int int int int int inv inv ion iro Isl iso iso Jac jet jud jur Kel Kep kil Klo kur Lag lam Lap Lar lat law lea len lep lib lig Lin lin lin liq lit loc log lon Lor low lum lun Lut Lyo mac 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 mol mom Moo mos Mu mul mus nad nas nat neb neg net neu New New nig Noe non non non nor nuc nuc nul nut Obe obl obs occ Oct off old one ope opp opt opt orb ord org Ori osc oth ova oxi P-w pal par par par par Pas pat pej per per per per per per pha phi pho pho pho phy pin Pla pla pla pla pla plu Poi pol pol pol poo pos pos pot pra pre pre pre Pre pri pri pro pro pro pro pro pro pro pse pul Pur qua qua qua qua que rad rad rad rad rad rad raf ran rar ray rea rea rec rec red red ref ref reg rel rel rel rep res res res res ret rev ric rig rin roc ROS rot Rox rus Sad sam sat sca sca Sch sci sea sec sec see sel sem sen ser Sgr sha shi sho sid sig sim sin Sir ske sli Smo soc sol sol sol Sol Som sou spa spa spe spe spe sph spi spi Spo squ sta sta sta sta Ste ste ste Sto str str str sub sub suc sun sup sup sup sup sur Swa syn syn tac tas tel tem ter tes the the the the Tho thr tid tim tit top tot tra tra tra tra tre tri Tro tru tun tut Tyn typ ult unb und uni uni uns ups Urv vag van vec vei Ven ver Vic Vir vir vis vol W b war wav wav wea wee Wey Wid win WN2 Wol wro XMM YOR zen zir > >>