An Etymological Dictionary of Astronomy and AstrophysicsEnglish-French-Persian

فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory

Homepage

Number of Results: 3 Search : slope
 Salpeter slope   شیب ِ سلپیتر   šib-e SalpeterFr.: pente de Salpeter   The value of the exponent in the → initial mass function as derived by Salpeter (1955) for solar to → intermediate mass stars in the Solar neighborhood: &Gamma = 1.35 or &alpha = 2.35, or x = -1.35. Also known as Sapleter index. slope   شیب   šib (#)Fr.: pente   1) An inclined surface; deviation from the horizontal or vertical. 2) The tangent of the angle formed by the intersection of a given straight line and the X-axis of a system of Cartesian coordinates. 3) The derivative of the function whose graph is a given curve evaluated at a designated point. 4) The exponent of the → initial mass function . See also → Salpeter slope. 5) → slope parameter.From M.E. aslope (adv.) "on the incline," from O.E. *aslopen, p.p. of aslupan "to slip away," from a- "away" + slupan "to slip."Šib "slope, descent, declivity," contraction of nešib, našib "declivity, descent; lowness of ground, slope of any place;" Mid.Pers. nišēp "declivity, (astrology) dejection," Av. *nixšvaēpā-, xšvaēpā- "bottom, rear." slope parameter   پارامون ِ شیب   pârâmun-e šibFr.: paramètre de pente   In a → power-law distribution or → regression, the → exponent that represents the effect of the → independent variable, x, on the → dependent variable, y. X has no association with y if the slope parameter = 0 and x has strong association with y if the slope parameter is large.→ slope; → parameter.