Fr.: fermeture de fente
A pair of rolling lids that are used to open or close the dome slit.
Bastâr, from bast, past tense stem of bastan + -âr. Bastan, from Mid.Pers. bastan/vastan "to bind, shut," Av./O.Pers. band- "to bind, fetter," banda- "band, tie," Skt. bandh- "to bind, tie, fasten," PIE *bhendh- "to bind," cf. Ger. binden, E. bind, → band. The suffix -âr creates creates agent nouns; → dome.
Fr.: fente de coupole
An opening along the spherical body of a dome through which an optical telescope can observe.
Fr.: coefficient dominant
To have control, authority, or influence;
to be the most important or conspicuous person or thing.
From L. dominatus, p.p. of dominari "to rule, dominate, govern," from dominus, → domain.
Ciridan, from ciré "dominant; powerful; victorious," Mid.Pers. cêr "victorious, brave," Av. cirya- "able, brave."
Fr.: série dominée
An act or instance of dominating.
Verbal noun of → dominate.
M.E. donour, from O.Fr. doneur, from L. donator, from donare "to give as a gift," donum "gift," dare "to give," cognate with Pers. dâdan "to give," from PIE base *do- "to give."
Dahandé "giver," from dâdan "to give," Mid.Pers. dâdan "to give," O.Pers./Av. dā- "to give, grant, yield," Av. dadāiti "he gives," Skt. dadâti "he gives," Gk. didomi "I give," PIE base *do- "to give." For L. cognates see above.
Fr.: étoile donneuse
In a → binary system, a star whose gas is → accreted by a compact companion. The donor may be a → giant or a → supergiant with an enormously distended atmosphere and a significant → stellar wind, or a star filling its → Roche lobe in a → close binary.
A movable barrier by which an entry is closed and opened.
M.E. dore, O.E. duru "door, dor gate;" akin to Ger. Tür, O.Norse dyrr, O.Irish dorus, Pers. dar, as below.
Dar "door," Mid.Pers. dar; O.Pers. duvara-; Av. dvar-; cf. Skt. dvár-; Gk. thura; L. fores; Lith. dvaras "court-yard;" E. door, as above; PIE *dhwer-/*dhwor- "door, gate."
Electronics: To add or treat a pure semiconductor with an impurity (dopant) to change its electrical properties.
From Du. doop "thick dipping sauce," from dopen "to dip."
Âqârdan "to mix, to soak," cf. Sogdian wγyr- "to soak, steep," zγr "moisture," Ossetic qaryn "to permeate, seep through (of liquid)," Skt. ghar-, jigharti "to sprinkle, drip."
The addition of minute quantities of impurities to a semiconductor to achieve a desired characteristic.
Verbal noun of → dope.
pahneš -e Doppler
Fr.: élargissement Doppler
In atomic physics, the broadening of an emission or absorption line due to the Doppler effect. Random motions of molecules or atoms of the gas that is emitting or absorbing the radiant energy shift the apparent wavelength of each emitter, and the cumulative effect of indivisual shifts is to broaden the line.
Fr.: effet Doppler
Change in frequency of a wave (light, sound) due to the relative motion of source and receiver. Approaching objects have their wavelengths shortened. Receding objects have emitted wavelengths lengthened.
Doppler, after Christian Andreas Doppler (1803-1853), Austrian physicist who first described how the observed frequency of sound and light waves is affected by the relative motion of the source and the detector; → effect.
Fr.: profil Doppler
The shape of the spectral line resulting from the Doppler broadening.
Fr.: décalage Doppler
Effect of the relative motion of a wave source (light, sound) and the observer. If the source is moving away, the wavelength is stretched (shifted toward lower frequencies). If the source is approaching, the wavelength is compressed (shifted toward higher frequencies). These effects, known as Doppler shifts, are in the case of light waves called redshift and blueshift, respectively.
Fr.: tomographie Doppler
A technique using a series of Doppler-shifted line profiles at different orbital phases in cataclysmic variable stars (CVs) to image the compact system in the light of a particular emission line. Although developed for CVs, the method has wider applications. An alternative method is → eclipse mapping.
Mâhi-ye zarrin, zarrin mâhi (#)
The Swordfish. A constellation in the southern hemisphere near → Reticulum and → Pictor. It contains most of the → Large Magellanic Cloud which laps over to some extent into the neighboring constellation → Mensa. The south → ecliptic pole also lies within this constellation. Abbreviation: Dor, Genitive: Doradus.
Dorado, from Sp., from L.L. deaurutus, p.p. of deaurare "to gild," from → de- + aurium "gold." Dorado (Coryphaena hippurus) is a surface-dwelling fish found in off-shore tropical and subtropical waters worldwide. It is distinguished by dazzling golden colors on the sides.
Mâhi "fish," from Mid.Pers. mâhik, Av. masya-, cf.
Skt. matsya-, Pali maccha-.
Fr.: produit scalaire
Same as → scalar product.
O.E. dott "speck, head of a boil," perhaps related to Norw. dot "lump, knot," Du. dot "knot, wisp;" cognate with O.H.G. tutta "nipple;" → product.
1) Composed of two like parts or members.
From O.Fr. duble, from L. duplus "twofold" (Gk. diplos "double"), from duo "two" + -plus "fold."
Dotâyi, from dotâ, from do "two," akin to L. duo, + tâ "fold, plait, ply; piece, part," Mid.Pers. tâg "piece, part."
Fr.: intégrale double
The simplest case of a → multiple integral.