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
Taylor number
  عدد ِ تیلر   
adad-e Taylor

Fr.: nombre de Taylor   

A → dimensionless number indicating the relative importance of the → centrifugal and → viscous forces in the → Taylor-Couette flow. It is also called rotational Reynolds number. Its value depends on the length scale of the convective system, the rotation rate, and → kinematic viscosity. The Taylor number Ta is expressed by Ω2Rd32 where Ω is the → angular velocity of the inner cylinder, R = (R1 + R2)/2 is the mean radius of the two cylinders, d = R2 - R1 is the distance between the cylinders, and ν is → kinematic viscosity. If Ta is equal or greater than one, the rotational effects are significant.

Named after Geoffrey Ingram Taylor (1886-1975), a British physicist, mathematician, and expert on fluid dynamics and wave theory; → number.

Taylor series
  سری ِ تیلر   
seri-ye Taylor (#)

Fr.: série de Taylor   

A series expansion of an infinitely differentiable function about a point a: Σ (1/n!) (x - a) n f n (a), where fn(a) is the n-th derivative of f at a, and the sum over n = 0 to ∞. If a = 0 the series is called a → Maclaurin series.

Named for the English mathematician Brook Taylor (1685-1731); → series.

Taylor-Couette flow
  تچان ِ تیلر-کویءت   
tacân-e Taylor-Couette

Fr.: écoulement de Taylor-Couette   

The → Couette flow between two concentric cylinders with fluid filling the annular region. The flow is generated by the relative rotation of the two cylinders. Under some physical conditions the flow may undergo the → Taylor-Couette instability.

Taylor number; → flow.

Taylor-Couette instability
  ناپایداری ِ تیلر-کویءت   
nâpâydâri-ye Taylor-Couette

Fr.: instabilité de Taylor-Couette   

A hydrodynamic instability in the → Taylor-Couette flow that arises when the rotation velocity of the fluid exceeds a critical value. The instability arises for → Taylor numbers larger than about 1700. At the beginning the fluid elements will move in simple rolls, but turbulence in the form of complex spirals will appear with increasing rotation velocity.

Taylor-Couette flow; → instability.

Taylor-Goldstein equation
  هموگش ِ تیلر-گلدشتاین   
hamugeš-e Taylor-Goldstein

Fr.: équation de Taylor-Goldstein   

Fluid mechanics: A second order differential equation that governs the vertical structure of a perturbation in a stratified parallel flow.

Named after G. I. Taylor (Effect of variation in density on the stability of superposed streams of fluid, 1931, Proc. R. Soc. Lond. A, 132, 499), → Taylor number, and S. Goldstein (On the stability of superposed streams of fluids of different densities, 1931, Proc. R. Soc. Lond. A, 132, 524); → equation.

Taylor-Proudman theorem
  فربین ِ تیلر-پراؤدمن   
farbin-e Taylor-Proudman

Fr.: théorème de Taylor-Proudman   

In a rapidly rotating fluid, the fluid velocity is constant along any line parallel to the axis of rotation.

Taylor number; Joseph Proudman (1888-1975), British mathematician and oceanographer.

teach
  آموختن   
âmuxtan (#)

Fr.: enseigner   

To impart knowledge or skill to; give instruction to.

M.E. techen, O.E. tæcan; cf. O.H.G. zihan, Ger. zeihen "to accuse," Goth. ga-teihan "to announce;" cognate with Pers. dis, → form.

Âmuxtan, âmuz- "to teach; learn;" Mid.Pers. hammoxtan, hammoz- "to teach; learn;" cf. Sogd. muck "teacher;" Choresmian mxs "to learn," mwcy "to teach, instruct;" Proto-Iranian *mauc- "to learn; teach."

technetium
  تکنتیوم   
teknetium (#)

Fr.: technétium   

A radioactive chemical element which does not exist naturally on Earth; symbol Tc. Atomic number 43; mass number of most stable isotope 98; melting point 2,200°C; boiling point 4,877°C. Technetium is synthesised via the → s-process in deep layers of → asymptotic giant branch stars.

From the Gk. technetos "artificial," initially called masurium.

technique
  تشنیک، فن   
tašnik, fann

Fr.: technique   

The body of specialized procedures and methods used in any specific field, especially in an area of applied science.

From Fr. technique "formal practical details in artistic expression," noun use of adj. technique "of art, technical," from Gk. tekhnikos, from tekhne "art, skill, craft, method, system;" cognate with Pers. tarâš- "to cut, hew; scape; shave," tišé "axe," as below.

Tašnik, related to Pers. tarâšidan "to cut, hew; scape; shave;" Mid.Pers. tâšitan "to cut, cleave; create by putting together different elements;" from Av. taš- "to cut off, fashion, shape, create," taša- "axe" (Mod.Pers. taš, tišé "axe;" tarâšidan "to shave"), tašan- "creator;" cf. Skt. taks- "to fom by cutting, tool, hammer, form," taksan- "wood-cutter, carpenter;" Gk. tekton "carpenter," tekhne "art, skill, craft, method, system;" L. textere "to weave;" PIE *teks- "to fashion."
Fann or fan, from Pers. fan "way, manner, mode, art, science," related to Mod/Mid.Pers. pand "path, advice, counsel;" Khotanese pande "road, path;" Ossetic fœndœg "path, road;" O.Pers. paθi- "path, way;" Av. paθ- "path, way," variants paθi-, paθā-, pantay-; cf. Skt. pánthā- "road, path, course;" Gk. patos "path, way," pontos "sea;" L. pons "bridge, path;" P.Gmc. *finthanan "to find;" E. find; PIE base *pent- "to go, to tread."

technology
  تشنیک‌شناسی، فناوری   
tašnik-šenâsi (#), fanâvari (#)

Fr.: technologie   

The use of scientific knowledge for the creation and development of devices, machines, and techniques to achieve a commercial, industrial, or scientific objective.

From Gk. tekhnologia "systematic treatment of an art, craft, or technique," originally referring to grammar, from tekhno-, from tekhne, → technique, + → -logy.

tectonics
  سازانیک   
sâzânik

Fr.: tectonique   

The science or art of assembling, shaping, or ornamenting materials in construction; the constructive arts in general. → plate tectonics

L.L. tectonicus, from Gk. tektonikos "pertaining to building," from tekton (genitive tektonos) "builder, carpenter," → technique.

Sâzânik, from sâzân pr.p. of sâz-, sâxtan "to build, make, fashion; to adapt, adjust, be fit" (Mid.Pers. sâxtan, sâz-, Manichean Parthian s'c'dn "to prepare, to form;" Av. sak- "to understand, to mark," sâcaya- (causative) "to teach") + -ik, → -ics.

Teide 1
  تایده-۱   
Teide 1

Fr.: Teide 1   

The first genuine → brown dwarf, discovered in 1995. It is located in the → Pleiades open cluster at approximately 400 → light-years. Teide 1 is a faint object of apparent magnitude I = 19.03, with a late → M dwarf spectral type (M8), corresponding to 55±15 → Jupiter masses (Rebolo et al. 1995, Nature 377, 129).

Named for Observatorio del Teide, Teide Observatory (Tenerife, Canary Islands, Spain), where this object was first detected.

tektite
  تکتیت   
tektit (#)

Fr.: tektite   

Small glassy bodies whose chemical composition is unrelated to the geological formation in which they are found. They are found mostly in Australia, Java, Philippines and Indochina. Tektites are now thought to have been produced by the impact of meteorites on the earth's surface.

From Gk. tekt(os) "molten" + -ite a suffix used in the name of minerals and fossils.

tele-
  دور-   
dur- (#)

Fr.: télé-   

A combining form meaning "distant."

From Gk. tele-, combining form of tele "far off, afar, at or to a distance," related to teleos "end, goal, result, perfection."

Dur- "far," from Mid.Pers. dūr "far, distant, remote;" O.Pers. dūra- "far (in time or space)," dūraiy "afar, far away, far and wide;" Av. dūra-, dūirē "far," from dav- "to move away;" cf. Skt. dūrá- "far; distance (in space and time);" PIE base *deu- "to move forward, pass;" cf. Gk. den "for a long time," deros "lasting long."

telemetry
  دورسنجی   
dursanji (#)

Fr.: télémétrie   

The science and technology of measurement and transmission of data by optical, acoustical, or radioelectric means from remote sources, as from space vehicles, to receiving stations for recording and analysis.

tele- + → -metry.

telescope
  دوربین، تلسکوپ   
durbin (#), teleskop (#)

Fr.: télescope   

An instrument used to collect and amplify light or other energy. → Refracting telescopes gather light by means of a lens, → reflecting telescopes by means of a mirror. → Radiotelescopes gather radio energy by using an antenna. Telescopes have also been built that can gather X rays, gamma rays, and other forms of energy. → grazing incidence telescope.

From It. telescopio (used by Galileo, 1611), and Mod.L. telescopium (used by Kepler, 1613), both from Gk. teleskopos "far-seeing," from → tele- "far" + -skopos "seeing," from skopein "to watch, look, behold;" → -scope.

Durbin, from dur-, → tele-, + -bin "to see; seer," → -scope.

telescope dome
  گنبد ِ دوربین، ~ ِ تلسکوپ   
gonbad-e durbin (#), ~ teleskop (#)

Fr.: coupole de télescope   

A covering, usually hemispherical, that is rotatable about a central axis. There is a slit opening along one side wide enough to allow a telescope to be directed at any vertical angle up to 90°.

telescope; → dome.

telescope pointing accuracy
  رشمندی ِ آماجش ِ دوربین، ~ ~ تلسکوپ   
rašmandi-ye âmâješ-e durbin, ~ ~ teleskvp

Fr.: précision du pointage de télescope   

The accuracy with which a telescope can be pointed to a particular coordinate in the sky.

telescope; → pointing; accuracy.

Telescopium
  تلسکوپ   
Teleskop (#)

Fr.: Télescope   

The Telescope. An inconspicuous constellation situated in the southern hemisphere, at 19h right ascension, 50° south declination. Abbreviation: Tel; genitive: Telescopii.

Telescopium was named by Abbé Nicolas Louis de Lacaille (1713-1762); → telescope.

Telesto
  تلستو   
Telesto (#)

Fr.: Telesto   

The tenth of Saturn's known satellites. It is irregularly-shaped and has a diameter of 29 x 22 x 20 km. Telesto orbits Saturn at a distance of 294,660 km. Telesto is co-orbital with Tethys, residing in Tethys' leading Lagrangian point (L4). The images taken by the Cassini probe during its distant flyby on October 11, 2005 show that its surface is surprisingly smooth, devoid of small impact craters. Telesto was discovered by B. Smith, H. Reitsema, S. Larson, J. Fountain in 1980 from ground-based observations.

In Gk. mythology Telesto was a daughter of Oceanus and Tethys.

<< < -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 > >>