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: 12948 Search : far
dispersion
  پاشش   
pâšeš (#)

Fr.: dispersion   

1) The resolution of white light into its component wavelengths, either by → refraction or by → diffraction. Dispersion is actually an effect in which radiations having → different wavelengths travel at different speeds in the medium. Since the → angle of refraction of each radiation vary as a function of its → wavelength, the component waves deviate from each other.
2) The rate of change of → refractive index with wavelength: dn/dλ. → Cauchy's equation shows that dispersion varies approximately as the inverse cube of the wavelength.
3) The selective → retardation of → radio waves when they propagate through a → plasma. As a result, higher → frequency waves from a → pulsar will arrive at the Earth before the lower frequencies due to the presence of → intervening → ionized gas in the → interstellar medium. → dispersion measure.
4) Statistics: The spread of values of a → variable around the → mean or → median of a → distribution.

Verbal noun of → disperse.

dispersion curve
  خم ِ پاشش   
xam-e pâšeš

Fr.: courbe de dispersion   

A graph displaying the variation of the → refractive index of a substance against the wavelength of the electromagnetic wave passing through the substance.

dispersion; → curve.

dispersion equation
  هموگش ِ پاشش   
hamugeš-e pâšeš

Fr.: équation de dispersion   

An equation representing the variation of → refractive index as a function of → wavelength; for example → Cauchy's equation and → Sellmeier's equation.

dispersion; → equation.

dispersion measure
  اندازه‌ی ِ پاشش   
andâze-ye pâšeš

Fr.: mesure de dispersion   

A parameter used in radio astronomy which describes the amount of dispersion in a radio signal due to its passage through an intervening plasma. It is proportional to the product of the interstellar electron density and the distance to the source.

dispersion; → measure.

dispersion relation
  بازانش ِ پاشش   
bâzâneš-e pâšeš

Fr.: relation de dispersion   

An equation that describes how the → angular frequency, ω, of a wave depends on its → wave number, k. For the simplest of waves, where the speed of propagation, c, is a constant, ω(k) = ck. If the → phase velocity depends on k, that is for a dispersive medium, the function ω(k) is nonlinear.

dispersion; → relation.

dispersive
  پاشنده، پاششی   
pâšandé, pâšeši

Fr.: dispersif   

Tending or serving to disperse.

From → disperse + → -ive.

dispersive index
  دیشن ِ پاششی   
dišan-e pâšeši

Fr.: indice de dispersion   

The reciprocal of the → dispersive power.

dispersive; → index.

dispersive medium
  مدیم ِ پاشنده   
madim-e pâšandé

Fr.: milieu dispersif   

A medium in which the → phase velocity is a function of → wave number (→ frequency).

dispersive; → medium.

dispersive power
  توان ِ پاشش   
tâvân-e pâšeš

Fr.: pouvoir dispersif   

A measure of the ability of a medium to separate different colors of light. It is defined by: (n2 - n1)/(n - 1), where  n1 and n2 are refractive indices at two specified widely differing wavelengths, and n is the → index of refraction for the average of these wavelengths.

dispersive; → power.

displacement
  جا-به-جایی   
jâ-be-jâyi (#)

Fr.: déplacement   

Physics: A vector quantity that specifies the change of position of a body or particle from the mean position or position of rest.
Geology: The offset of rocks caused by movement along a fault.

From displace, from → dis- + place + -ment.

Jâ bé jâyi, noun of jâ bé jâ literally "place to place," from "place," from Mid.Pers. giyag "place," O.Pers. ā-vahana- "place, village," Av. vah- "to dwell, stay," vanhaiti "he dwells, stays," Skt. vásati "he dwells," Gk. aesa (nukta) "to pass (the night)," Ossetic wat "room; bed; place," Tokharian B wäs- "to stay, wait;" PIE base ues- "to stay, live, spend the night."

displacement current
  جریان ِ جا-به-جایی   
jarayân-e jâ-be-jâyi (#)

Fr.: courant de déplacement   

In electromagnetism, a quantity which is not a real current (movement of charge), but has the units of current and has an associated magnetic field. The physical meaning of this displacement current is that a changing electric field makes a changing magnetic field.

displacement; → current.

display
  ۱) نمودن، نمایاندن، نمایش‌دادن؛ ۲) نمایش   
1) nemudan, nemâyândan, nemâyeš dâdan; 2) nemâyeš (#)

Fr.: 1) visualiser; 2) visualisation   

1a) To show; make visible.
1b) Of computers, to show the output data on a screen.
2a) The act of displaying.
2b) Of computers, a visual representation of information.

From O.Fr. despleier "to unfold, spread out," from L. displicare "to scatter," from → dis- "un-, apart" + plicare "to fold, twist," from PIE base *plek- "to plait, twist" (cf. Gk. plekein "to plait," L. plectere "to plait, braid, intertwine," Av. frašna- "helmet" (in ərəzatô.frašna- "having a silver helmet" (epithet of Mithra), Skt. praśna- "turban," O.H.G. flehtan "to plait," Russ. plesti "to plait").

Nemudan, nemâyândan "to show, display," from Mid.Pers. nimūdan, present stem nimây- "to show," from O.Pers./Av. ni- "down; into," → ni-, + māy- "to measure," cf. Skt. mati "measures," matra- "measure," PIE base *me- "to measure;" cf. Gk. metron "measure," L. metrum.

displease
  وازوشیدن   
vâzušidan

Fr.: déplaire   

1) To incur the dissatisfaction, dislike, or disapproval of; offend; annoy.
2) To be unpleasant; cause displeasure (Dictionary.com).

dis-; → please.

displeasure
  وازوشه   
vâzušé

Fr.: mécontentement, déplaisir   

Dissatisfaction, disapproval, or annoyance.

dis-; → pleasure.

disqualification
  واچونایش   
vâcunâyeš

Fr.: disqualification   

An act or instance of disqualifying; the state of being disqualified.

disqualify; → -tion.

disqualified
  واچوناییده، واچونامند   
vâcunâyide, vâcunâmand

Fr.: non qualifié   

(of a person) declared ineligible for an office, activity, or competition because of an offence or infringement (OxfordDictionaries.com).

dis-; → qualified.

disqualify
  واچوناییدن، واچونامند کردن   
vâcunâyidan, vâcunâmand kardan,

Fr.: disqualifier   

To deprive of qualification or fitness; render unfit; incapacitate (Dictionary.com).

dis-; → qualify.

disruption
  گسیخت   
gosixt

Fr.: rupture   

Forcible division into pieces of an object. → tidal disruption.

From L. disruptio "a breaking asunder," noun of action from p.p. stem of disrumpere "break apart, split, shatter, break to pieces," from → dis- "apart" + rumpere "to break."

Gosixt, past stem of gosixtan "to tear away, to beark off."

dissect
  واسکنجیدن   
vâsekanjidan

Fr.: disséquer   

1) To cut apart (an animal body, plant, etc.) to examine the structure, relation of parts, or the like.
2) To examine minutely part by part; analyze: to dissect an idea (Dictionary.com).

L. dissectus, p.p. of dissecare "to cut to pieces," from dissecare "cut in pieces," from → dis- "apart" + secare "to cut," → section.

Vâsekanjidan, from vâ- "apart," → dis-, + sekanjidan "to cut to pices," cognate with šekastan "to break," → section.

dissection
  واسکنجش   
vâsekanješ

Fr.: dissection   

The act of dissecting.

dissect; → -tion.

<< < -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 > >>