šaxâne-ye Bahrâmi, šahâbsang-e ~
Fr.: météorite martienne
A piece of rock that was ejected from the Martian surface into space by the impact of an asteroid or comet, and landed on Earth. So far about 100 Martian meteorites have been collected. These meteorites have elemental and isotopic compositions that match those of the Martian crust as measured by NASA's Mars exploration missions.
Fr.: plume de Mars
A slender, cloudy projection sometimes seen to extend from the surface of → Mars to very high altitudes. Noted and confirmed by amateur astronomers on photos of Mars in March 2012, possibly similar plumes have been found on archived images as far back as 1997. The plumes reach 200 km up, which seems too high for them to be related to wind-blown surface dust. Since one plume lasted for more than 10 days, it seemed too long lasting to be related to → aurora. The origin of this phenomenon is not yet known.
1) Having qualities appropriate to or usually associated with a man.
M.E. masculin, from O.Fr. masculin "of the male sex," from L. masculinus "male, of masculine gender," from masculus "male, masculine; worthy of a man," diminutive of mas "male person, male," of unknown origin.
Narin, from nar, → male.
1) A source of very intense, narrow-band, coherent microwave
radiation involving → stimulated emission, as
in the → laser.
Maser stands for Microwave Amplification by Stimulated Emission of Radiation; → laser.
gosil-e meyzeri (#)
Fr.: émission maser
An emission arising from the → maser process.
1) mâsk (#); 2) mâsk zadan (#)
Fr.: 1) masque; 2) masquer
1) Something that serves to cover or conceal.
From M.Fr. masque "covering to hide or guard the face," from It. maschera, from M.L. masca "mask, specter, nightmare," of uncertain origin.
1) Mâsk, loan from Fr., as above; 2) with verb zadan "to make, to do," originally "to strike, beat; to do; to play an instrument" (Mid.Pers. zatan, žatan; O.Pers./Av. jan-, gan- "to strike, hit, smite, kill" (jantar- "smiter"); cf. Skt. han- "to strike, beat" (hantar- "smiter, killer"); Gk. theinein "to strike;" L. fendere "to strike, push;" Gmc. *gundjo "war, battle;" PIE *gwhen- "to strike, kill").
Fr.: masque, masquage
1) A method of improving → spatial resolution
of images. → pupil masking;
→ unsharp masking.
Verbal noun of → mask.
1) jerm (#), qond (#); 2) tudé (#), anbuh (#)
1) A measure of the amount of material in an object, defined either by the
inertial properties of the object or by its gravitational influence on other
bodies. See also → inertial mass,
→ gravitational mass.
From O.Fr. masse "lump," from L. massa "kneaded dough, lump," from Gk. maza "barley cake, lump, mass, ball," related to massein "to knead."
Jerm, from Ar. jirm.
mass absorption coefficient
hamgar-e daršm-e jermi
Fr.: coefficient d'absorption de masse
A measure of the rate of absorption of radiation, expressed as the linear absorption coefficient divided by the density of the medium through which radiation is passing.
Fr.: défaut de masse
The difference between the rest mass of an atomic nucleus (made up of protons and neutrons) and the sum of the masses of its individual protons and neutrons. The mass difference is equal to the released binding energy. Also called mass deficiency
Fr.: densité massique
The mass per unit area of the ring material, integrated through the thickness of the ring. Sometimes called → surface density (Ellis et al., 2007, Planetary Ring Systems, Springer).
Fr.: écart de masse
1) For → massive stars and → supergiants,
the difference between the → spectroscopic mass and the
→ evolutionary mass. Early studies found that the spectroscopic
mass was systematically less than the evolutionary mass by as much as a factor of 2 for
supergiants. Improvements in the stellar atmosphere models (taking into account
→ line blanketing) have decreased or eliminated the size of the
discrepancy for Galactic stars. There is still a mass discrepancy for the hottest
→ O stars in the → Magellanic Clouds
(See, e.g. Massey et al. 2009, ApJ 692, 618).
Fr.: énergie de masse
The energy (E) associated with a mass (m), as specified by the → mass-energy equivalence E = mc2, where c is the → speed of light. For a moving body the total energy of the particle is expressed by: E2 = m2c4 + p2c2, where m is → rest mass and p → momentum.
Fr.: extinction en masse
An event in the history of life on Earth in which large numbers of species (sometimes more than 90% of some species) vanish in a relatively short period of time. In spite of controversy, it is generally recognized that there have been at least six major mass extinctions. These occurred in the late Cambrian (500 million years ago), in the late Ordovician (440 million years ago), in the late Devonian (365 million years ago), at the end of the Permian (245 million years ago), in the late Triassic (208 million years ago), and at the end of the Cretaceous (65 million years ago).
Fr.: écoulement de masse
The mass of a fluid that passes a specified unit area in a unit amount of time.
Fr.: formule de masse
Fr.: fraction de masse
The fractional amount (by mass) of a given element or nuclide in a given composition.
Fr.: fonction de masse
1) The number of a class of objects as a function of their mass.
→ initial mass function (IMF);
→ present-day mass function (PDMF).
Fr.: perte de masse
The outpouring of particles and gas from a star, occurring at varying rates and by a variety of processes throughout a star's lifetime. → Bipolar flows are believed to be due to mass loss by forming → protostars, while → massive stars lose their mass through powerful → stellar winds.