amplification factor karvand-e dâmane-dahi Fr.: facteur d'amplification 1) Electronics: The extent to which an
→ analogue → amplifier
boosts the strength of a → signal. Also called
→ gain. → amplification; → factor. |
artifact dasâc Fr.: objet fabriqué, artefact 1) An object made by a human being, typically one of cultural or historical
interest. From It. artefatto, from L. arte "by skill" (ablative of ars "→ art") + factum "thing made," from facere "to make, do," → -fy. Dasâc "hand made," from das variant of dast, → hand, + sâc, variant of sâz-, sâxtan, → agree. |
attenuation factor karvand-e tonokeš Fr.: facteur d'atténuation The ratio of the radiation intensity after traversing a layer of matter to its intensity before. → attenuation; → factor. |
Boltzmann factor karvand-e Boltzmannn Fr.: facteur de Boltzmann The factor e^{-E/kT} involved in the probability for atoms having an excitation energy E and temperature T, where k is Boltzmann's constant. → Boltzmann's constant; → factor. |
clumping factor karvand-e gudedâri Fr.: facteur de grumelage The ratio f_{cl} = <ρ^{2}> / <ρ >^{2}, where ρ represents the → stellar wind density and the brackets mean values. Unclumped wind has f_{cl} = 1 and → clumping becomes significant for f_{cl}≅ 4. |
cofactor hamkarvand Fr.: cofacteur A number associated with an → element of a → determinant. If A is a square matrix [a_{ij}], the cofactor of the element a_{ij} is equal to (-1)^{i+j} times the determinant of the matrix obtained by deleting the i-th row and j-th column of A. |
compression factor karvand-e tanješ Fr.: facteur de compression In thermodynamics, the quantity Z = pV_{m}/RT, in which P is the gas pressure, V_{m} the molar volume, R the gas constant, and T the temperature. The compression factor is a measure of the deviation of a real gas from an ideal gas. For an ideal gas the compression factor is equal to 1. → compression; → facteur. |
conversion factor karvand-e hâgard Fr.: facteur de conversion 1) A numerical factor that, by multiplication or division, translates one
unit or value into another. → conversion; → factor. |
cosmic scale factor karvand-e marpal-e keyhâni Fr.: facteur d'échelle cosmologique A quantity, denoted a(t), which describes how the distances between any two galaxies change with time. The physical distance d(t) between two points in the Universe can be expressed as d(t) = R(t).x, where R(t) is the → scale factor and x the → comoving distance between the points. The cosmic scale factor is related to the → redshift, z, by: 1 + z = R(t_{0})/R(t_{1}), where t_{0} is the present time and t_{1} is the time at emission of the radiation. The quantity (1 + z) gives the factor by which the → Universe has expanded in size between t_{1} and t_{0}. It is also related to the → Hubble parameter by H(t) = R^{.}(t)/R(t), where R^{.}(t) is the time → derivative of the scale factor. In an → expanding Universe the scale factor increases with time. See also the → Friedmann equation. |
deuterium enrichment factor karvand-e pordâri-ye doteriom Fr.: facteur d'enrichissement en deutérium The ratio between the D/H value in → water
and in → molecular hydrogen, as expressed by: → deuterium; → enrichment; → factor. |
dilution factor karvand-e owtâleš Fr.: facteur de dilution The energy density of a radiation field divided by the equilibrium value for the same color temperature. |
Eddington factor karvand-e Eddington Fr.: facteur d'Eddington Same as → Eddington parameter. → Eddington limit; → factor. |
fact bâšâ, budé (#) Fr.: fait Something that has actual existence; a piece of information presented as having objective reality. → scientific fact. L. factum "event, occurrence," literally "something done, deed," from neut. p.p. of facere "to do" (cf. Fr. faire, Sp. hacer), from PIE base *dhe- "to put, to do" (cf. Mod.Pers. dâdan "to give;" O.Pers./Av. dā- "to give, grant, yield," dadāiti "he gives; puts;" Skt. dadáti "puts, places;" Hitt. dai- "to place;" Gk. tithenai "to put, set, place;" Lith. deti "to put;" Czech diti, Pol. dziac', Rus. det' "to hide," delat' "to do;" O.H.G. tuon, Ger. tun, O.E. don "to do"). Bâšâ, from bâš + -â agent suffix; bâš, present stem of budan "to be," from Mid.Pers. budan, from O.Pers./Av. bav- "to be; become, take place;" Av. buta- perf. ptcpl. pass., bavaiti "becomes" (cf. Skt. bhavati "becomes, happens," bhavah "becoming; condition, state;" PIE *bheu- "to be, come into being, become;" Gk. phu- "become," phuein "to bring forth, make grow;" L. fui "I was" (perf. tense of esse), futurus "that is to be, future;" Ger. present first and second person sing. bin, bist; E. to be; Lith. bu'ti "to be;" Rus. byt' "to be"); budé also from budan. |
factor karvand Fr.: facteur 1) One that actively contributes to the production of a result. M.Fr. facteur "agent, representative," from L. factor "doer or maker," from facere "to do" (cf. Fr. faire, Sp. hacer); from PIE base *dhe- "to put, to do;" cf. Skt. dadhati "puts, places;" Av. dadaiti "he puts;" Hitt. dai- "to place;" Gk. tithenai "to put, set, place;" Lith. deti "to put;" Rus. det' "to hide," delat' "to do;" O.H.G. tuon; Ger. tun; O.S., O.E. don "to do." Karvand, from kar- root of Mod.Pers. verb kardan "to do, to make" (Mid.Pers. kardan; O.Pers./Av. kar- "to do, make, build;" Av. kərənaoiti "he makes;" cf. Skt. kr- "to do, to make," krnoti "he makes, he does," karoti "he makes, he does," karma "act, deed;" PIE base k^{w}er- "to do, to make") + -vand a suffix forming adjectives and agent nouns. |
factor tree deraxt-e karvand Fr.: arbre des facteurs A diagram representing a systematic way of determining all the prime factors of a number. |
factorial 1) karvandeh; 2) karvandi Fr.: factoriel 1) (n.) The product of all the positive integers from 1 to n, denoted by
symbol n! |
factorize karvandidan, karvand gereftan Fr.: factoriser The operation of resolving a quantity into factors. |
filling factor karvand-e pori Fr.: facteur de remplissage Of a molecular cloud or a nebula, the ratio of the volumes filled with matter to the total volume of the cloud. Filling, from fill, from O.E. fyllan, from P.Gmc. *fullijan (cf. Du. vullen, Ger. füllen "to fill"), a derivative of adj. *fullaz→ full; → factor. |
Gaunt factor karvand-e Gaunt Fr.: facteur de Gaunt In the atomic theory of spectral line formation, a quantum mechanical correction factor applied to the absorption coefficient in the transition of an electron from a bound or free state to a free state. Gaunt, after John Arthur Gaunt (1904-1944), English physicist born in China, who significantly contributed to the calculation of continuous absorption using quantum mechanics; → factor |
integrating factor karvand-e dorostâlandé Fr.: facteur intégrant A function that converts a → differential equation, which is not exact, into an → exact differential equation. This is done by multiplying all terms of the original equation by the integrating factor. |