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bifurcation dogaleš Fr.: bifurcation 1) A branching or division into two parts; a splitting apart. Verbal noun of → bifurcate. |
bifurcation point noqte-ye dogaleš Fr.: point de bifurcation The point or moment in the evolution of a → dynamical system that occurs if a parameter passes through a critical point. At this point the system branches into any number of qualitatively new types of behavior. → bifurcation; → point. |
bifurcation theory negare-ye dogaleš Fr.: théorie de bifurcation 1) A theory which studies how, in certain nonlinear systems, there may be paths
and shifts in behavior dependent on small changes in circumstances or the current position
of the system. → bifurcation; → theory. |
binomial differential degarsâne-ye donâmin Fr.: binôme différentiel An expression of the form x^{m}(a + bx^{n})^{p}dx, where m, n, p, a, and b are constants. → binomial; → differential. |
blueshift âbikib Fr.: décalage vers le bleu The apparent shift of the wavelength towards the shorter wavelength region of the radiation spectrum of an approaching object due to the Doppler effect. |
blueshifted component hamneye âbikib Fr.: composante décalée vers le bleu A constituent of a composite astronomical object which has a motion directed towards the observer, as revealed by its spectrum. |
Boeshaar-Keenan classification radebandi-ye Boeshaar-Keenan Fr.: classification de Boeshaar-Keenan A system for the classification of → S-type stars. The system involves the designations of a C/O index and a temperature type. Moreover, when possible, it uses intensity estimates for → ZrO bands, the → TiO bands, the → Na I D-lines, the YO bands, and the Li I 6708 line. Philip C. Keenan & Patricia C. Boeshaar, 1980, ApJS, 43, 379; → classification. |
calculus of finite differences afmârik-e degarsânihâ-ye karânmand Fr.: calcul des différences finies A → claculus based on the properties of the successive values of → variable quantities and their → differences or → increments. → calculus, → finite, → difference. Afmârik, → calculus, degarsânihâ, plural of degarsân, → difference, karânmand, → finite. |
central uplift bâlâmad-e markazi Fr.: pic central Same as → central peak. |
centrifugal markaz-goriz (#) Fr.: centrifuge Acting or moving in a direction away from the axis of rotation or the center of a circle along which a body is moving. From Mod.L., coined 1687 by Sir Isaac Newton from L. centri-, combining form of centrum, → center, + fugere "to run away, flee." Markaz-goriz, from markaz, → center, + goriz "running away," from gorixtan, gorizidan "to run away," Mid.Pers. virextan, proto-Iranian *vi-raik, from vi- "apart, asunder" + *raik, Av. raek- "to leave, set free, let off," Mid./Mod.Pers. reg/rig (in mordé-rig "inheritance," Skt. ric- "to leave," rinakti "gives up, evacuates," Gk. leipein "to leave," L. linquere "to leave," from PIE *linkw-, from *leikw- "to leave behind" (cf. Goth. leihvan, O.E. lænan "to lend;" O.H.G. lihan "to borrow;" O.N. lan "loan"). |
centrifugal acceleration šetâb-e markaz-goriz (#) Fr.: accélération centrifuge Of a point rotating in a circle round a central point, the outward acceleration away from the rotation axis. It corresponds to → centrifugal force. The centrifugal acceleration is given by ω x ω x r, or v^{2}/r, where ω is → angular velocity, r the distance to the rotating axis, and v the → tangential velocity. The centrifugal and → centripetal accelerations are equal and opposite. → centrifugal; → acceleration. |
centrifugal force niru-ye markaz-goriz (#) Fr.: force centrifuge A force in a rotating reference frame directed outward from the axis of rotation. → centrifugal; → force. |
clarification âruneš, runekard Fr.: clarification The action of making a statement or situation less confused and more comprehensible. Verbal noun of → clarify. |
clarify ârunidan, runé kardan Fr.: clarifier 1) To make (an idea, statement, etc.) clear or intelligible; to free from ambiguity. |
classification radebandi (#) Fr.: classification The systematic grouping of astronomical objects into categories on the basis of physical, morphological, or evolutionary characteristics. Classification, from O.Fr., from classifier, from → class + -fier, from L. -ficare, root of facere "to make, do;" PIE base *dhe- "to put, to do" (cf. Skt. dadhati "puts, places;" Av. dadaiti "he puts," O.Pers. ada "he made," Gk. tithenai "to put, set, place." Radebandi, from radé, → class, + bandi, verbal noun of bastan "to bind, shut; to get, acquire, incur," from Mid.Pers. bastan/vastan "to bind, shut;" Av./O.Pers. band- "to bind, fetter," banda- "band, tie;" cf. Skt. bandh- "to bind, tie, fasten;" Ger. binden, E. bind, → band; PIE base *bhendh- "to bind." |
cliff tondân (#) Fr.: falaise A very high steep rock or ice face, especially one that runs along a coastline. → scarp. M.E., O.E. clif (cf. O.S. clif, O.N. klif, O.H.G. klep, M.Du. klippe, Ger. Klippe "cliff, steep rock"). Tondân, from tond "swift, rapid, brisk," → scarp + -ân a suffix of nuance/relation. |
compactification hampakâneš Fr.: compactification 1) Math.: A process applied to topological spaces having
many dimensions to make them compact spaces. Compactification, n. from → compactify. |
compactify hampakânidan Fr.: compactifier Verbal form of → compactification. Compactify, from → compact + -ify "cause to become," M.E. -fien, from O.Fr. -fier, from L. -ficare, root of facere "to make, do;" PIE base *dhe- "to put, to do" (cf. Skt. dadhati "puts, places;" Av. dadaiti "he puts," O.Pers. ada "he made," Gk. tithenai "to put, set, place." |
Compton shift kib-e Compton Fr.: décalage de Compton Of the → Compton effect, the amount of increase in the wavelength of an energetic photon upon its collision with an electron. |
conformal compactification hampakâneš-e hamdi Fr.: compactification conforme A mapping of an infinite → space-time onto a finite one that may make the far away parts of the former accessible to study. The technique invented by Penrose defines an equivalence class of → metrics, g_{ab} being equivalent to ĝ_{ab} = Ω^{2}g_{ab}, where Ω is a positive scalar function of the space-time that modifies the distance scale making the asymptotics of the physical metric accessible to study. → conformal; → compactification. |
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