An Etymological Dictionary of Astronomy and AstrophysicsEnglish-French-Persian

فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory

Homepage

Number of Results: 1059
 potential density   چگالی ِ توند   cagâli-ye tavandFr.: densité potentielle   Of a fluid parcel at pressure P, the density that it would acquire if adiabatically brought to a reference pressure.→ potential; → density. potential difference   دگرسانی ِ توند   degarsâni-ye tavandFr.: 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   کاروژ ِ توند   kâruž-e tavandFr.: 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. potential energy curve   خم ِ کاروژ ِ توند   xam-e kâruž-e tavandFr.: 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; → energy; → curve. potential field   میدان ِ توند   meydân-e tavandFr.: 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; → field. potential gradient   زینه‌ی ِ توند   zine-ye tavandFr.: 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; → gradient. potential well   چاه ِ توند   câh-e tavandFr.: 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.→ potential; → well. potentiality   توندی   tavandiFr.: potentialité   1) The state or quality of being potential. Something potential. 2) According to Aristotle, what has the possibility of having → form, in contrast to → actuality; the power to effect change.→ potential + → -ity. potentially   توندانه   tavandânéFr.: potentiellement   With a possibility of becoming actual; possibly.→ potential; → -ly. potentially hazardous asteroid (PHA)   سیارک ِ توندانه آپه‌ناک   seyyârak-e tavandâné âpenâkFr.: 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   توندسنج   tavandsanjFr.: potentiomètre   An instrument for measuring electrical quantities by balancing an unknown potential difference against a known potential difference.From potenti(al), → potential + -o + → -meter. power   توان   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. 2) Math.: An → exponent to which a given quantity is raised. The expression xn is therefore known as "x to the n-th 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   کریای ِ توانی   karyâ-ye tavâniFr.: fonction de puissance   A function of the form f(x) = xn, where n is a → real number.→ power; → function. power law   قانون ِ توانی   qânun-e tavâni (#)Fr.: loi de puissance   A mathematical relationship between two quantities expressed by a → power function.→ power; → law. power series   سری ِ توانی   seri-ye tavâni (#)Fr.: série de puissance   A series in which the terms contain regularly increasing powers of a variable. In general, a0 + a1x + a2x2 + ... + anxn, where a0, a1, etc. are constants.→ power; → series. power spectral density   چگالی ِ بینابی ِ توان   cagâli-ye binâbi-ye tavânFr.: densité spectrale de puissance   Same as → spectral density.→ power; → spectral; → density. power spectrum   بیناب ِ توانی   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; → spectrum. power-law distribution   واباژش با قانون ِ توانی   vâbâžeš bâ qânun-e tavâniFr.: 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   کهکشان ِ بیضی‌گون با قانون ِ توانی   kahkešân-e beyzigun bâ qânun-e tavâniFr.: 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).→ power; → law; → galaxy. Poynting vector   بردار ِ پوینتینگ   bordâr-e PoyntingFr.: 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.