density-bounded H II region
nâhiye-ye H II-ye cagâli karânmand
Fr.: bornée par la densité
An → H II region which lacks enough matter to absorb all → Lyman continuum photons of the → exciting star(s). In such an H II region a part of the ionizing photons escape into the → interstellar medium. See also → ionization-bounded H II region.
1) lerd; 2) lerd andâxtan, lerd oftâdan, lerdidan
Fr.: 1) dépôt, gisement, lie, tarte; 2) déposer, se déposer
1a) Something precipitated, delivered and left, thrown down, or accumulated,
as by a natural process.
Lerd "sediment, tartar of wine," probably a variant of dord "dregs, lees, sediment, tartar of wine."
The process by which water vapor changes directly to ice without first becoming a liquid. This is how snow forms in clouds, as well as frost and hoar frost on the ground. The opposite of deposition is → sublimation. → condensation.
M.E., from O.Fr. deposition, from L. deposition- "putting aside, testimony, burial," from deposit(us) "laid down," p.p. of deponere "to put down," from → de- + ponere "to put, place."
Vâneheš, from vâ-→ de- + neheš verbal noun of nehâdan "to put, place," Mid.Pers. nihâtan, O.Pers./Av. ni- "down; into," → ni-, + dā- "to put; to establish; to give," dadāiti "he gives," cf. Skt. dadâti "he gives," Gk. didomi "I give," L. do "I give;" PIE base *do- "to give."
Fr.: transition discrète
A transition between two quantum-mechanical energy levels. See also → discrete spectrum.
The state or fact of being diverse; difference; unlikeness.
Fr.: viscosité dynamique
Fr.: luminosité d'Eddington
Same as → Eddington limit.
Einstein-de Sitter effect
oskar-e Einstein-de Sitter
Fr.: effet Einstein-de Sitter
Same as → geodetic precession.
Einstein-de Sitter Universe
giti-ye Einstein-de Sitter
Fr.: Univers Einstein-de Sitter
The → Friedmann-Lemaitre model of → expanding Universe that only contains matter and in which space is → Euclidean (ΩM > 0, ΩR = 0, ΩΛ = 0, k = 0). The Universe will expand at a decreasing rate for ever.
dartanuyi-e barqi (#)
Fr.: intensité électrique
The strength of an electric field at any point as measured by the force exerted upon a unit positive charge placed at that point.
cagâli-ye elektroni (#)
Fr.: densité électronique
joft-e elektron-pozitron (#)
Fr.: paire électron-positron
Fr.: transition électronique
Fr.: densité d'énergie
The amount of energy in the form of radiation per unit volume, expressed in ergs cm-3. In particular, the energy density of blackbody radiation at temperature T is aT4, where the radiation constant a = 7.56 × 10-15 erg cm-3 (K)-4.
Fr.: transit au méridien des éphémérides
The passage of a celestial body or point across the → ephemeris meridian.
naheš-e tarâzmandi (#)
Fr.: position d'équilibre
The position of an oscillating body at which no net force acts on it.
Complete set of points in any given space group which are obtained by performing the symmetry operations of the space group on a single point (x, y, z).
Fr.: densité de flux
Flux of radiation that falls on a detector per unit surface area of the detector per unit bandwidth of the radiation per unit time.
Fr.: transition interdite