<< < -sc Sag sam sat sca Sch Sch scr sec sec SED sei sel sem seq Sex Sha she sho sid sil sim sin sit sky sma sno Sof sol sol sol sol sou spa spa spe spe spe sph spi spl squ sta sta sta sta Ste ste sti sto str Str sub sub sub sul sup sup sup sup sur sus sym syn > >>
self-similar xod-hamânad Fr.: auto-similaire 1) Of a geometric figure, having a structure analogous or identical to its overall structure.
→ fractal. |
self-similar process farâravand-e xod-hamânad Fr.: processus auto-similaire A process that is invariant in distribution under scaling of time. Schematically, images taken of such a process at different time scales will look similar. |
self-similarity xod-hamânadi Fr.: auto-similarité The property of being → self-similar. → self-; → similarity. |
Sellmeier's equation hamugeš-e Sellmeier Fr.: équation de Sellmeier An empirical relation between the → refractive index of a medium and the wavelength of light passing through the medium: n^{2} - 1 = Σ (A_{i}λ^{2}/(λ^{2} - λ_{i}^{2})), where n is the refractive index at wavelength λ, and A_{i} and λ_{i} are constants. Named after Wolfgang Sellmeier who derived the equation in 1871; → equation. |
semantic cemârik Fr.: sémantique 1) Of, pertaining to, or arising from the different meanings of words
or other signs and symbols. From Fr. sémantique, from Gk. semantikos "significant," from semainein "to show, signify, indicate by a sign," from sema "sign." |
semantics cemârik Fr.: sémantique The study of the → meaning of signs or symbols, as opposed to their formal relations (→ syntactics). |
semen šosar (#) Fr.: sperme, semence Biology: The male reproductive fluid, containing spermatozoa in suspension. → inseminate, → insemination; → fecundate, → fecundation. M.E., from L. semen "seed;" akin to serere "to sow;" cf. O.C.S. seme, O.H.G. samo; E. sow. From Mid.Pers. šusar "semen; liquid, fluid;" Av. xšudra- "semen; liquid, fluid;" related to Pers. šostan/šuy- "to → wash." |
semi- nim- (#), nimé- (#) Fr.: semi-, demi- A combining form meaning "half," freely prefixed to English words of any origin. From L. semi- "half," from PIE *semi-; cf. Skt. sāmi "half," sāmi-krita- "half-done;" Gk. hemi- "half;" O.E. sam-; Goth. sami- "half." Nim, nimé "half," from Mid.Pers. nêm, nêmag "half;" Av. naēma- "half;" cf. Skt. néma- "half." |
semi-forbidden line xatt-e nime-bažkam Fr.: raie semi-interdite A → spectral line for which the upper and lower → energy levels have different values of S, the total → spin angular momentum. These lines violate the quantum mechanical → selection rule under → LS coupling, ΔS = 0. For example, the Ca I λ6573 line results from transition between the upper → triplet state (^{3}P_{1}) with a total spin angular momentum S = 1 and the → ground state, a → singlet state (^{1}S_{0}, total spin angular momentum S = 0). A semi-forbidden line is marked by a right bracket following the atom name, i.e. Ca I], in the above-mentioned case. Same as → interconnection line and → intersystem line. |
semi-forbidden transition gozareš-e nime-bažkam Fr.: transition semi-interdite An → atomic transition whose probability is reduced by a factor of the order of 10^{6} because of → selection rules. Same as → interconnection line. → semi-; → forbidden; → transition. |
semi-major axis âse-ye nimeh-mehin Fr.: demi grand axe Half the length of the major axis of an ellipse; a standard element used to describe an elliptical orbit. see orbital elements |
semiconductor nim-hâzâ, nime-rasânâ Fr.: semi-conducteur Any of various solid crystalline substances, such as germanium or silicon, which has conducting properties intermediate between metals and insulators. → semi-; → conductor. |
semiconductor junction juhe-ye nim-hâzâ Fr.: jonction semi-conducteur In a semiconductor device, a region of transition between semiconducting regions of different electrical properties. → semiconductor; → junction. |
semiconvection nim-hambaz Fr.: semi-convection An instability occurring in the region just outside the → convective core of a → massive star. The instability occurs when a → superadiabatic layer is stabilized by a chemical gradient. In fact, semiconvection takes place if → Schwarzschild's criterion for convection is fulfilled but at the same time → Ledoux's criterion is not fulfilled. The time-scale of semiconvection is the thermal time-scale, which is short compared to the nuclear time-scale in → main sequence stars but long compared to the time-scale of convection. However, semiconvection has a profound influence on the → post-main sequence star evolution. It affects the convective mixing above the hydrogen shell source, determines the appearance and extent of → blue loops in the → Hertzsprung-Russell diagram during core → helium burning, and is essential for defining the extent of the convective cores during core helium burning (See, e.g., N. Langer, 2012, Ann. Rev. Astron. Astrophys. 50, 107). → semi-; → convection. |
semidetached binary dorin-e nim-jodâ Fr.: bianire semi-détachée A binary system whose secondary member fills its Roche lobe but whose primary member does not. → semi-; detached, p.p. of detach, from O.Fr. destachier (Fr. détacher), from des- "apart," + -tachier (as in atachier "to attach"); → binary. Dorin, → binary; nim-jodâ, from nim-→ semi- + jodâ "separate," from Mid.Pers. yut "separate, different;" Av. yuta- "separate, apart." |
semidetached system râšmân-e nim-jodâ Fr.: système semi-détaché Same as → semidetached binary. → semi-; detached, p.p. of detach, from O.Fr. destachier (Fr. détacher), from des- "apart," + -tachier (as in atachier "to attach"); → system. Râžmân, → system; nim-jodâ, from nim-→ semi- + jodâ "separate," from Mid.Pers. yut "separate, different;" Av. yuta- "separate, apart." |
semidiameter nim-tarâmun Fr.: demi-diamètre The angle at the observer subtended by the equatorial radius of the Sun, Moon, or a planet. |
semiempirical nime-ârvini Fr.: semi-empirique Describing an → equation or → formula that results from a → combination of → experiment and → theory. |
semiempirical binding energy formula disul-e nime-ârvini-ye kâruž-e bandeš Fr.: formule semi-empirique de l'énérgie de liaison Same as → Weizsacker formula. → semiempirical; → binding; → energy; → formula. |
semilatus rectum nim-târ-e râst Fr.: demi-latus rectum Half the → latus rectum. For an ellipse, semilatus rectum has the expression l = b^{2}/a, where a and b are semi-major and minor axes of the ellipse. It can also be expressed in terms of → eccentricity, e, as: l = a(1 - e^{2}). → semi-; → latus rectum. |
<< < -sc Sag sam sat sca Sch Sch scr sec sec SED sei sel sem seq Sex Sha she sho sid sil sim sin sit sky sma sno Sof sol sol sol sol sou spa spa spe spe spe sph spi spl squ sta sta sta sta Ste ste sti sto str Str sub sub sub sul sup sup sup sup sur sus sym syn > >>