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potential density cagâli-ye tavand Fr.: densité potentielle Of a fluid parcel at pressure P, the density that it would acquire if adiabatically brought to a reference pressure. |
potential difference degarsâni-ye tavand Fr.: différence de potentiel Between two points, the work done in taking the unit test object from one point to the other. Potential is a scalar quantity. → potential; → difference. |
potential energy kâruž-e tavand Fr.: énergie potentielle Of a system, the work done in changing the system from some standard configuration to its present state. Thus, if a body of mass m is raised vertically through a height h, the work done, mgh, is the increase in potential energy. |
potential energy curve xam-e kâruž-e tavand Fr.: courbe de l'energie potentielle A plot that displays the → potential energy of a moving body as a function of its position. It is explained by the → conservation of energy and the conversion of potential energy into → kinetic energy and vice versa. |
potential field meydân-e tavand Fr.: champ de potentiel A field that has a → potential. A continuous → vector fieldA in a domain D is a potential field in D if and only if its → work around every closed curve C contained in D is zero: ∫A.ds = 0. Examples include the → gravitational field and the → electrostatic field. |
potential gradient zine-ye tavand Fr.: gradient de potentiel At a point, the rate of change of potential V, with distance x, measured in the direction in which the variation is a maximum. The intensity F of the field is proportional to the potential gradient, but is oppositely directed: F = -dV/dx. |
potential well câh-e tavand Fr.: puit de potentiel Region in a → field of force in which the potential decreases abruptly, and in the surrounding region of which the potential is larger. |
potentiality tavandi Fr.: potentialité 1) The state or quality of being potential. Something potential. |
potentially tavandâné Fr.: potentiellement With a possibility of becoming actual; possibly. |
potentially hazardous asteroid (PHA) seyyârak-e tavandâné âpenâk Fr.: astéroïde potentiellement dangereux An asteroid that could make a threatening close approach to the Earth. In technical terms a PHA is defined as having an → absolute magnitude of 22 or brighter and an → Earth Minimum Orbit Intersection Distance (MOID) of less than 0.05 → astronomical unit or 7.5 million km. → potentially; → hazardous; → asteroid. |
potentiometer tavandsanj Fr.: potentiomètre An instrument for measuring electrical quantities by balancing an unknown potential difference against a knowj potgndial difference. |
power tavân (#) Fr.: puissance, pouvoir 1) Physics: The → rate of doing
→ work on transferring → energy, as
expressed in ergs/sec, watts, etc. Same as → mechanical power. M.E. pouer(e), poer(e), from O.Fr. povoir, noun use of the infinitive in O.Fr., "to be able," from V.L. *potere, from L. potis "powerful, able, capable;" cognate with Av. paiti- "lord, husband;" Mod.Pers. -bad (sepah-bad "general, commander of an army"); Skt. pái- "master, husband;" Gk. posis "husband;" Lith. patis "husband." Tavân "power, strength," tavânestan "to be powerful, able;" Mid.Pers. tuwan "power, might," from O.Pers./Av. base tav- "to have power, to be strong, to be able," Av. tavah- "power," təviši- "strength," Mod.Pers. tuš, tâb "power, ability," O.Pers. tauman- "power, strength," tunuvant- "powerful," Skt. tu- "to be strong, to have authority," tavas-, tavisa- "strong, energetic," tavisi- "power, strength." |
power function karyâ-ye tavâni Fr.: fonction de puissance A function of the form f(x) = x^{n}, where n is a → real number. |
power law qânun-e tavâni (#) Fr.: loi de puissance A mathematical relationship between two quantities expressed by a → power function. |
power series seri-ye tavâni (#) Fr.: série de puissance A series in which the terms contain regularly increasing powers of a variable. In general, a_{0} + a_{1}x + a_{2}x^{2} + ... + a_{n}x^{n}, where a_{0}, a_{1}, etc. are constants. |
power spectral density cagâli-ye binâbi-ye tavân Fr.: densité spectrale de puissance Same as → spectral density. |
power spectrum binâb-e tavâni (#) Fr.: spectre de puissance The plot that gives the portion of a signal's power falling within given frequency bins. The most common way of generating a power spectrum is by using a discrete Fourier transform. |
power-law distribution vâbâžeš bâ qânun-e tavâni Fr.: distribution en loi de puissance For a → random variable X, any → distribution which has the form: P(X ≥ x) = (k/x)^{α}, where x is a value in the range defined for X, k > 0 is a parameter termed location parameter, and α > 0 is the → slope parameter. → power; → law; → distribution. |
power-law elliptical galaxy kahkešân-e beyzigun bâ qânun-e tavâni Fr.: galaxie elliptique en loi de puissance An → elliptical galaxy whose → surface brightness can be approximated by a single → power law at small radii (r ≤ 10-20''). More modern interpretations have emphasized that these profiles can be better understood as the inward continuation of the galaxy's overall → Sersic profile, usually modified by an additional, nuclear-scale stellar component (S. P. Rusli et al., 2013, AJ 146, 160). |
Poynting vector bordâr-e Poynting Fr.: vecteur de Poynting The amount of electromagnetic energy flowing through unit area, perpendicular to the direction of energy propagation, per unit time, given by (c/2 π)[E x H]. → Poynting's theorem. → Poynting's theorem; → vector. |
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