collisional cross section sekanj-e oskarmand-e hamkubeši Fr.: section efficace de collision Same as → cross section. → collisional; → cross; → section. |
conic section sekanj-e maxruti Fr.: section conique A curve which may be represented as the intersection of a plane with a cone; hence a → parabola, → hyperbola, or → ellipse. |
cross section sekanjgâh Fr.: 1) section plane; 2) section efficace 1) Math: The intersection of a plane with a geometric figure,
usually at right angles to an axis of symmetry. In classical mechanics, the cross section for the collision of a point particle with a hard sphere is just be the surface of a section through the middle of the sphere. This explains the name "cross section." → cross; → section. |
dissection vâsekanješ Fr.: dissection The act of dissecting. |
intersection andarboreš, andarsekanj Fr.: intersection The act, process, or result of intersecting. Verbal noun of → intersect. |
minimum orbit intersection distance (MOID) durâ-ye kamine-ye andarsekanj-e madâr Fr.: distance minimale d'intersection d'une orbite The minimum distance between the paths of two orbiting objects around a → primary. Such distance between an object and Earth is called Earth MOID. → minimum; → orbit; → intersection; → distance. |
nuclear cross-section sekanjgâh-e hasteyi Fr.: section efficace nucléaire Apparent cross-section possessed by an atomic nucleus when it undergoes a particular type of collision process. → nuclear; → cross section. |
section sekanj (#) Fr.: section A part that is cut off or separated. From M.Fr. section, from L. sectionem "a cutting, division," from secare "to cut;" PIE base *sek- "cut" (cf. O.C.S. seko, sesti "to cut," Lith. isekti "to engrave, carve;" O.S. segasna, O.E. sigðe "scythe;" O.E. secg "sword," seax "knife, short sword"). Sekanj "a scraping, shaving, cutting," cognate with Pers. šekast-, šekastan "to break;" Av. skand- "to break," Skt. khand- "to break," khanda- "piece;" Pers. dialect Tabari šag "a special razor used to make incisions in the walls of unripe opium poppies in order to extract the milky sap," may be related to PIE *sek- "cut," as above. |
Thomson cross section sekanjgâh-e Thomson Fr.: section efficace de Thomson The → cross section involved the → Thomson scattering of electromagnetic waves by a free electron. It is defined by: σ_{T} = 8πr_{e}^{2}/3, where r_{e} is the classical → electron radius. Its value is 0.665 245 x 10^{-28} m^{2}. |