Fr.: état macroscopique
Same as → macrostate.
Statistical physics: A state of a physical system that is described in terms of the system's overall or average properties at a macroscopic level (→ temperature, → pressure, → density, → internal energy, etc.). A macrostate will generally consist of many different → microstates. In defining a macrostate we ignore what is going on at the microscopic (atomic/molecular) level. The → probability of a certain macrostate is determined by how many microstates correspond to this macrostate. Therefore, the greater the number of microstates which lead to a particular macrostate, the greater the probability of observing that macrostate. Same as → macroscopic state. See also → entropy, → Boltzmann's entropy formula, → multiplicity.
Fr.: pont magellanique
A filament of → neutral hydrogen which connects the → Small Magellanic Cloud and → Large Magellanic Cloud. The Magellanic Bridge appears to result from a → close encounter between these two galaxies some 200 million years ago.
Fr.: Nuage de Magellan
Magellanic, named in honor of Ferdinand Magellan, the Portuguese navigator (c. 1480-1521), who undertook the first voyage around the world. The two Clouds were first described by Magellan's chronicler Pigafetta, after leaving the Strait of Magellan in 1520; → cloud.
Fr.: courant magellanique
A thin trail of gas stretching from the → Magellanic System toward our own Galaxy over about 150° on the sky, corresponding to hundreds of thousands of light-years. This gas consists primarily of → neutral hydrogen and is thought to have originated from the Large and Small Magellanic Clouds as a result of tidal interactions with the Milky Way. See, e.g., Fox et al. 2013, arxiv/1304.4240, and references therein.
Fr.: système magellanique
Magellanic type galaxy
kahkešân-e gune-ye Magellani
Fr.: galaxie de type magellanique
1) A civil officer charged with the administration of the law.
M.E., from O.Fr. magistrat, from L. magistratus "a magistrate, public functionary," from magistrare "to serve as a magistrate," from magister, "chief, director," → master.
From L. magma "dregs of an ointment," from Gk. magma "an ointment," from root of massein "to knead, mold."
Mâgma, loanword from Fr.
otâqak-e mâgmâ (#)
Fr.: chambre magmatique
A metallic chemical element; symbol Mg. Atomic number 12; atomic weight 24.305; melting point about 648.8°C; boiling point about 1,090°C. The Scottish chemist Joseph Black recognized it as a separate element in 1755. In 1808, the English chemist Humphrey Davy obtained the impure metal and in 1831 the French pharmacist and chemist Antoine-Alexandre Brutus Bussy isolated the metal in the pure state.
The name originally used was magnium and was later changed to magnesium, which is derived from Magnesia, a district in the northeastern region of Greece called Thessalia.
âhanrobâ (#), meqnâtis (#)
An object that produces a magnetic field around itself.
From L. magnetum (nom. magnes) "lodestone," from Gk. ho Magnes lithos "the Magnesian stone," from Magnesia region in Thessaly where magnetized ore was obtained.
Âhanrobâ, literally "iron attracting, iron robbing," from âhan→ iron + robâ agent noun of robudan, robâyidan
"to attract, to grab, rob;" Av. urūpaiieinti "to cause racking
pain(?);" cf. Skt. rop- "to suffer from abdominal pain,"
rurupas "to cause violent pain," ropaná- "causing
racking pain," rópi- "racking pain;" L. rumpere
"to break;" O.E. reofan "to break, tear."
A highly magnetized → neutron star with fields a thousand times stronger than those of → radio pulsars. There are two sub-classes of magnetars, → anomalous X-Ray pulsar (AXP)s and → soft gamma repeater (SGR)s, that were thought for many years to be separate and unrelated objects. In fact SGRs and AXPs are both neutron stars possessing → magnetic fields of unprecedented strength of 1014 - 1016 G, and that show both steady X-ray pulsations as well as soft gamma-ray bursts. Their inferred steady X-ray luminosities are about one hundred times higher than their → spin-down luminosities, requiring a source of power well beyond the magnetic dipole spin-down that powers → rotation-powered pulsar (RPP)s. New high-energy components discovered in the spectra of a number of AXPs and SGRs require non-thermal particle acceleration and look very similar to high-energy spectral components of young rotation-powered pulsars (A. K. Harding, 2013, Front. Phys. 8, 679).
meqnâtisi (#), meqnâti, âhanrobâyik
Of or pertaining to a magnet or magnetism.
Fr.: advection magnétique
The transport of the magnetic field by a fluid. It is given by the term ∇ x (v x B) in the → induction equation.
Fr.: axe magnétique
botri-ye meqnâtisi (#)
Fr.: bouteille magnétique
Fr.: freinage magnétique
The process whereby a star which loses mass slows down under the action of its → magnetic field. The stellar material follows the → magnetic field lines extending well beyond the stellar surface. The material gain → angular momentum and the underlying object is slowed down. Magnetic braking is an efficient mechanism for removing angular momentum from the the rotating object. See also → disk locking.
Fr.: rayonnement de freinage magnétique
Same as → synchrotron radiation.