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federator hiyâvandé, hiyâvgar Fr.: fédérateur He who, or that which, federates. |
feed xorândan (#) Fr.: alimenter 1) To give food to; supply with nourishment. M.E. feden, from O.E. fedan "to nourish;" cf. O.S. fodjan, O.Fris. feda, Goth. fodjan "to feed." Xorândan, transitive form of xordan "to eat, consume," Mid.Pers. xvardan "to eat, enjoy (food)," Av. x^{v}ar "to consume, eat;" Laki dialect hovârden "to eat;" Proto-Iranian *huar- "to consume, eat." |
feedback bâzxord (#) Fr.: rétroaction 1) For any system that has an → input and
→ output,
the return of a fraction of the output to the input for the next action.
Feedback process allows a system to regulate itself by monitoring its own
output. It is of prime importance to
the working of all regulatory mechanisms found in
living and non-living nature, as well as in social systems such
as education and economy. |
feedback loop gerdâl-e bâzxord Fr.: boucle de rétroaction A closed transmission path in a → feedback process involving part of the → output as an → input for correction or control of the operation of a → system. |
feedforward pišxord Fr.: In a self-regulatory system, monitoring a disturbance before it enters the → system to apply corrections before the disturbance has influenced the system. See also → feedback. |
feedhorn karnâ, karnâ-ye xorând Fr.: cornet d'alimentation In a → radio telescope, a device located at the → focal point of the → antenna. It receives the → radio waves which the antenna collects and guides them to the → detector. |
feel sohidan (#) Fr.: sentir 1) To perceive or examine by touch. M.E. felen, from O.E. felan "to touch;" cf. O.S. gifolian, O.Fr.fela, Du. voelen, O.H.G. vuolen, Ger. fühlen "to feel;" from PIE root *pal- "to touch, feel, shake, strike softly" (cognates: Gk. psallein "to pluck (the harp)," L. palpare "to touch softly, stroke"). Sohidan, from Mid.Pers. sôhistan "to feel, to touch," sôhešn "feeling, sense," of unknown origin. Note Pers. sahestan "to fear," from Proto-Ir. *θrah- "to shake; to fear;" Pers. tars, harâs, sham "fear;" may be they are of different roots. |
feeling soheš (#) Fr.: sensation 1) The function or the power of perceiving by touch. Verbal noun of "to → feel." |
feldspar feldspât (#) Fr.: feldspath A group of rock-forming minerals whose members are the most abundant constituents of igneous rocks. They consist of aluminum silicates of potassium, sodium, and calcium and typically occur as colorless or pale-colored crystals. Modification of obsolete Ger. Feldspath (now Feldspat), from Ger. Feld "field" + obsolete Ger. Spath (now Spat) "spar." |
female mâde (#) Fr.: femelle 1) Of, relating to, or being the sex that typically has the capacity to bear offsprings or produce eggs. 2) A female person, animal, or plant. M.E., alteration of femel, femelle, from O.Fr. femelle "woman, female," from M.L. femella "a female," from L. femella "young female, girl," diminutive of femina "woman, a female," → feminine. Mâdé "female," from Mid.Pers. mâdag, "female," from mâd, → mother. |
feminine mâdin (#) Fr.: féminin 1) Characteristic of or appropriate or unique to women. M.E. feminin, from O.Fr. femenin "feminine, female; with feminine qualities," from L. femininus "feminine," from femina "woman, female," literally "she who suckles," from root of felare "to suck, suckle;" cf. Gk. thele "mother's breast, nipple," thelys "female, fruitful;" Pers. dâyé, dâyah "(wet-nurse);" PIE root *d^{h}e(i)- "to suck, suckle." Mâdin, from mâdé, → female. |
feminism zâd-zan-bâvari (#) Fr.: féminisme 1) Belief in the social, political, and economic freedom of women and
equality of the sexes. Feminism is closely tied to democracy and
→ secularism. From Fr. féminisme, from féminin "feminine, female," from L. femininus "feminine" (originally in the grammatical sense), from femina "woman, female," literally "she who suckles," cognates fecund "fruitful, fertile," felix "happy," fetus "offspring, pregnancy;" PIE base *d^{h}eh(i)- "to suck, suckle;" cf. Gk. thele "mother's breast;" Pers. dâyé "wet nurse." Zâd-zan-bâvari, from zâdzan "free woman" (on the model of zâdmard "free man, valiant man, generous man," zâdsarv "tall and upright cypress tree"), from zâd, contraction of âzâd, → free, + zan, → woman, + bâvari, → -ism. |
femto- femto- (#) Fr.: femto- In the International System of Units, a prefix meaning 10^{-15}. From Danish and Norwegian femten "fifteen," from O.N. fimmtān (Sw. femton, Du. vüftien, Ger. fünfzehn, E. fifteen, Pers. pânzdah), ultimately from PIE base *penk^{w}e "five" (cf. Mod.Pers. panj, Av. panca, Skt. pánca, Gk. pente, L. quinque) + PIE *dekm "ten" (cf. Mod.Pers. dah, Av. dasa, Skt. dáśa, Arm. tasn, Gk. deka, L. decem, Ger. zehn, E. ten, Fr. dix). |
Fermat number adad-e Fermat Fr.: nombre de Fermat Any number of the form 2^{2n} + 1, where n is a connective → integer. If Fermat number is → prime, it is called a → Fermat prime. → Fermat's principle; → number. |
Fermat prime naxost-e Fermat Fr.: nombre de Fermat premier A → Fermat number, 2^{2n} + 1, that is a → prime number. The only known Fermat primes are: 3, 5, 17, 257, and 65537, corresponding to n = 0, 1, 2, 3, and 4. → Fermat's principle; → prime. |
Fermat's last theorem vâpasin farbin-e Fermat Fr.: dernier théorème de Fermat In → number theory, the statement that for all → integers, the equation x^{n} + y^{n} = z^{n} has no solution in → positive integer. After 358 years of effort by mathematicians to prove the theorem, a complete proof was found by Andrew Wiles in 1995. → Fermat's principle; → last; → theorem. |
Fermat's principle parvaz-e Fermat Fr.: principe de Fermat The path taken by a ray of light going from one point to another through any set of media is such that the time taken is a minimum. This principle governs the light propagation and determines the geodesics of optical paths. Put forward by Pierre de Fermat (1601-1665), French mathematician, born at Beaumont-de-Lomagne; → principle |
fermi fermi (#) Fr.: fermi A unit of length equal to 10^{-13} cm. After Enrico Fermi (1901-1954), the Italian-born American physicist who was a key figure in the development of nuclear physics. He was awarded the 1938 Nobel Prize for Physics. |
Fermi constant pâyâ-ye Fermi Fr.: constante de Fermi The → coupling constant associated with the → weak interaction, which gives rise to → beta decay. C_{F} = 1.167 x 10^{-5} GeV^{-2}. |
Fermi energy kâruž-e Fermi Fr.: énergie de Fermi The energy of the highest occupied quantum state in a system of fermions at absolute zero temperature. See also → Fermi sea. |
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