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convective cloud abr-e hambazi Fr.: nuage convectif Meteorology: A cloud that owes its vertical development, and possibly its origin, to convection. → convective; → cloud. |
convective core maqze-ye hambazi Fr.: cœur convectif The central region of a → massive star where → convection prevails due to steep gradient of temperature relative to pressure. → convective; → core. |
convective envelope puše-ye hambazi Fr.: enveloppe convective 1) A → convective zone situated beneath the surface
of solar type stars. → convective; → envelope |
convective overshooting farâzad-e hambazi Fr.: dépassement convectif In a → massive star, penetration of the upper layers of the → convective core into the → radiative zone due to → turbulence effects. The enlargement of the convective core results in more luminous stars in theoretical models. → convective; → overshooting. |
convective vortex gerdšâr-e hambazi Fr.: tourbillon convectif A common feature of the atmosphere that ranges from small-scale → vortices such as → dust devils, to large-scale systems such as → cyclones. → convective; → vortex. |
convective zone zonâr-e hambazi Fr.: zone convective A zone inside a star in which → convection takes place; the central → core in → massive stars and the zone underneath → photosphere in low mass stars like the Sun. Recent works predict the presence of a thin convection zone in sufficiently massive main sequence stars which originates from the iron opacity and partial helium ionization. See also → iron convection zone. → convective; → zone. |
converge hamgerâyidan (#) Fr.: converger 1) General: To tend to meet in a point; incline toward each other. From L.L. convergere "to incline together" from → com- "together" + vergere "to bend." Hamgerâyidan, from ham- "together," → com- + gerâyidan "to incline toward, verge on; to intend," Mid.Pers. grayidan "to lean, incline; to intend, desire," → diverge. |
convergence hamgerâyi (#) Fr.: convergence 1) General: Act or state of converging. From converg-, from → convergent + -ence, equivalent to → -ance. Hamgerâyi, verbal noun from hamgerâyidan, → converge. |
convergent hamgerâ (#) Fr.: convergent Coming together, as a light beam after passing through a convex lens which brings the beam into the focus. Verbal ddj. from → converge. |
converging mirror âyene-ye hamgerâ (#) Fr.: miroir convergent A concave mirror that reflects a parallel beam into a convergent beam. |
conversion hâgard Fr.: conversion The act or process of converting; state of being converted. → convert. Verbal noun of → convert. Hâgard, from hâ- prefix denoting "reversal; to," sometimes creating nuance [Dehxodâ], + gard present stem of gardidan, gaštan "to change; to turn;" Mid.Pers. vartitan; Av. varət- "to turn, revolve;" cf. Skt. vrt- "to turn, roll," vartate "it turns round, rolls;" L. vertere "to turn;" O.H.G. werden "to become;" PIE base *wer- "to turn, bend." |
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. |
convert hâgard kardan Fr.: convertir 1) To change units of one measuring or calculating system into units of another. M.E. converten, O.Fr. convertir, from L. convertere "to turn around, transform," from → com- "together" + vertere "to turn;" cognate with Mod.Pers. gardidan "to change, to turn," → conversion. Compound verb from hâgard, → conversion, + kardan "to do, to make," → -ize. |
converter hâgardgar Fr.: convertisseur A device that receives data in one form and converts it to another. → analog-to-digital converter. |
convex kuž (#) Fr.: convexe Having a surface that is curved or rounded outward. From M.Fr. convexe, from L. convexus "vaulted, arched," p.p. of convehere "to bring together," from → com- "together" + vehere "to bring" (cf. Skt. vah- "to carry, lead," vahitra "vehicle," Av. vazaiti "to lead," Mid.Pers. waz-, wazidan "to carry away," Gk. oxos "chariot," PIE base *wegh- "to go, carry, drive"). Kuž "humped," Mid.Pers. kôf "hill, mountain; hump" (Mod.Pers. kuh, "mountain"), kôfik "humpbacked," O.Pers. kaufa-, Av. kaofa- "mountain." |
convex lens adasi-ye kuž (#) Fr.: lentille convexe A lens that converges an incident beam of light to a focus. → convex; → lens. |
convocation hamvac Fr.: convocation The act of convoking. The state of being convoked. Verbal noun of → convoke. |
convoke hamvacidan Fr.: convoquer To call together; summon to meet or assemble (Dictionary.com). M.E., from M.Fr. convoquer, from L. convocare "to call together," from → con- "together," + vocare "to call," from vox, → voice. Hamvacidan, from ham-, → com-, + vac "word," → voice, + -idan infinitive suffix. |
convolution hamâgiš Fr.: convolution 1) A mathematical combination of two functions which involves multiplying
the value of one function at a given point with the value of another
function, the weighting function, for a displacement from that point
and then integrating over all such displacements. The process is
repeated for every point of the function. Convolution expresses how the shape of
a function is altered by the other. In mathematical terms, the convolution of two functions
f(x) and g(x) is defined by:
f*g = ∫f(u)g(x - u) du, integral from -∞ to +∞. Verbal noun of → convolve. |
convolution theorem farbin-e hamâgiš Fr.: théorème de convolution A theorem stating that the → Fourier transform of the convolution of f(x) and g(x) is equal to the product of the Fourier transform of f(x) and g(x): F{f*g} = F{f}.F{g}. → convolution; → theorem. |
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