A device used to scatter or disperse light emitted from a source.
From → diffuse + -er.
1) Movement of a gas or liquid as a result of the random thermal motion
of its atoms or molecules.
L. diffusionem, from stem of diffundere "scatter, pour out," from dif- "apart, in every direction," → dis-, + fundere "to melt, cast, pour out," from PIE *gheud-, from root *gheu- "to pour."
Paxš, verbal noun and stem of paxšidan→ diffuse.
Fr.: coefficient de diffusion
A factor of proportionality involved in the → diffusion equation. It may be defined as the amount of the quantity diffusing across a unit area through a unit concentration gradient in unit time. → magnetic diffusivity.
Fr.: équation de diffusion
An equation that expresses the time rate of change of a quantity in terms of the product of the diffusion coefficient and the → Laplacian operating on the quantity. For example the diffusion equation for temperature is: ∂T/∂t = D∇2T.
Fr.: région de diffusion
A narrow boundary layer above the solar → photosphere, between two magnetic field lines, where the plasma becomes demagnetized or unfrozen. The presence of a localized magnetic region is necessary for → magnetic reconnection.
Fr.: diffusif, de diffusion
Tending to diffuse; characterized by → diffusion.
paxšandegi, hamgar-e paxš
Fr.: coefficient de diffusion
1) The ability to permit or undergo diffusion.
A symbol, numeral, or graphic character that represents an integer.
From L. digitus "finger, toe."
Raqam, from Ar.
1) Of or pertaining to a digit.
râyângar-e raqami (#)
Fr.: ordinateur numérique
A computer that accepts and operates with → discrete data in the form of combinations of digits, letters, or other characters. In modern terminology, generally called computer.
1) Having formed by two half-planes which intersect.
Fr.: angle dièdre
An angle formed by two planes meeting along a common line. Compare with → face angle.
A figure formed by two intersecting planes.
1) farâxândan; 2) farâxidan (#)
Fr.: 1) dilater; 2) se dilater
1) (v.tr.) To make wider or larger; cause to expand.
Farâxândan, farâxidan, infinitive from farâx "broad, wide, spacious;" Mid.Pers. frâxv, fraxv "broad, wide," frâxvitan, frâxvênitan "to spread."
The act of dilating; state of being dilated. Also dilatation.
Verbal noun of → dilate.
1) owtâl; 2) owtâlidan
Fr.: 1) dilué; 2) diluer
1) (adj.) Describing a solution that is reduced in concentration.
From L. dilutus, p.p. of diluere "dissolve, wash away," from → dis- "apart" + -luere, combining form of lavere "to wash;" cf. Pers. lur "flood" [Mo'in, Dehxodâ] (variants Lori, Kordi: laf, lafow, lafaw, Tabari: lé); Gk. louein "to wash;" Bret. laouer "trough;" PIE base *lou- "to wash."
Owtâl, from Tabari utâl, "having water, impregnated with water, waterlogged," from ow "water," → water + tâl variant of dâr "having, possessor," from dâštan "to have, to possess" (Mid.Pers. dâštan; O.Pers./Av. root dar- "to hold, keep back, maitain, keep in mind;" Skt. dhr-, dharma- "law;" Gk. thronos "elevated seat, throne;" L. firmus "firm, stable;" Lith. daryti "to make;" PIE base *dher- "to hold, support").
The process of reducing the concentration of solute in a solution by increasing the proportion of solvent.
Verbal noun of → dilute.
Fr.: facteur de dilution
The energy density of a radiation field divided by the equilibrium value for the same color temperature.
Fr.: faible, pâle, mat(e)
Not bright; obscure from lack of light.
O.E. dimm "dark, gloomy, obscure," from P.Gmc. *dimbaz.
Tiré, from Mid.Pers. têrag, variant of târig "dark," Av. taθra- "darkness," taθrya- "dark," cf. Skt. támisrâ- "darkness, dark night," L. tenebrae "darkness," Hittite taš(u)uant- "blind," O.H.G. demar "twilight."