The coating of steel or iron with → zinc, either by immersion in a bath of molten zinc or by electrolytic deposition from a solution of zinc sulfate, to give protection against corrosion.
Verbal noun of → galvanize.
1) To coat a metal with → zinc by dipping into molten zinc
or by electrolytic deposition.
From Fr. galvaniser, from galvanisme, → galvanism.
Galvano-, from → galvanism.
An instrument for measuring or detecting small → direct currents, usually by the mechanical reaction between the magnetic field of the current and that of a magnet.
A process used for covering an object with a thin layer of metal by electrochemical means.
→ galvano- + -plasty a suffix meaning "molding, formation, surgical repair, plastic surgery," from Gk. -plastia, from plastos "molded, formed," from plassein "to mold."
Gâlvânopuši, from gâlvâno-, → galvano-, + puši "covering, coating," from pušidan "to cover; to put on" (Mid.Pers. pôšidan, pôš- "to cover; to wear;" cf. Mid.Pers. pôst; Mod.Pers. pust "skin, hide;" O.Pers. pavastā- "thin clay envelope used to protect unbaked clay tablets;" Skt. pavásta- "cover," Proto-Indo-Iranian *pauastā- "cloth").
1) An amusement or pastime.
M.E. gamen. O.E. gaman "game, joy, fun, amusement;" cf. O.Fris. game "joy, glee," O.N. gaman, O.H.G. gaman "sport, merriment," D. gamen, Sw. gamman.
Bâzi, from Mid.Pers. wâzig "game, play," related to bâzidan "to play," bâxtan/bâz- "to loose (in game);" Proto-Ir. *uāz- "to play, contend;" cf. Skt. vāja- "contest, war, gain, reward" (Cheung 2007).
1) The third letter of the Greek alphabet (γ, Γ).
The third letter of the Gk. alphabet, from Gk. gamma, from Phoenician gimel.
Fr.: γ Cephei
A bright, third → magnitude (3.22) → giant star of → spectral type K1, also called → Errai, HR 8974, HIP 116727, and HD 222404. γCephei has a → surface temperature of 4920 K a mass of 1.40 Msun, a → luminosity 10.6 solar, and a radius 4.8 solar. Its distance is estimated to be 45 → light-years. γ Cephei will become the → Pole Star in about 2,000 years. γ Cephei has a low mass → companion (B), a main → main sequence star of spectral type M4 V with a mass of 0.4 Msun. It orbits the → primary star every 67.5 years. An → extrasolar planet. (γ Cephe b) has been discovered orbiting the main star.
Fr.: γ Cygni
The star → Sadr.
tabâhi-ye gâmâ (#)
Fr.: désintégration gamma
Fr.: mécanisme γ
A process which reinforces the → kappa mechanism in a → partial ionization zone. Because the temperature in the partial ionization zone is lower than in the adjacent stellar layers, heat tends to flow into the zone during compression, prompting further ionization.
partowhâ-ye gâmmâ (#)
Fr.: rayons gamma
axtaršenâsi-ye partowhâ-ye gâmmâ (#)
Fr.: astronomie en rayons gamma
gamma-ray burst (GRB)
belk-e partowhâ-ye gâmmâ
Fr.: sursaut de rayons gamma
Intense discharges of soft gamma rays of unknown origin, which range in duration from tenth of a second to tens of seconds and occur from sources widely distributed over the sky. The radio wave afterglow from the burst can last more than a year, making long-term observations of the enigmatic sources possible.
belkvar-e partow-e gâmmâ
Fr.: source à sursaut gamma
xan-e partowhâ-ye gâmma
Fr.: source de rayons gamma
1) An astronomical object that emits → gamma rays.
Fr.: γ2 Velorum
The closest → Wolf-Rayet star, located at 336 → parsecs. Also known as HR 3207, HD 68273, and WR 111. γ2 Velorum is composed of a → WC8 component in a → close binary system with an → O star in a 78.5 day orbit (see, e.g., Lamberts et al., 2017, arXiv: 1701.01124).
varqe-ye Gâmof (#)
Fr.: barrière de Gamow
In nuclear physics, a potential barrier near the surface of the nucleus that inhibits the release of alpha particles.
Gamow, after George Gamow (originally Georgiy Antonovich Gamov), the Ukrainian born theoretical physicist and cosmologist, who discovered quantum tunneling; → barrier.
Fr.: condition de Gamow
The constraint on the → baryon number density at T ~ 109 K in the early → expanding Universe. Gamow recognized that a key to the element buildup is the reaction n + p ↔ d + γ. Deuterium needs to be produced in sufficient abundance for higher elements to form, but if all → neutrons are immediately locked up into → deuterium, no higher elements can form either. The Gamow condition is expressed by nb<σv>t ~ 1, where nb is the baryon number density, σ is the cross section for the reaction at relative → velocity v, and t the expansion time-scale for the → Universe. This means that the time-scale for the above reaction is comparable to the expansion time. From this condition the baryon number density at the start of element buildup is found to be nb ~ (σvt)-1 ~ 1018 cm-3 at T = 109 K (P. J. E. Peebles, 2013, Discovery of the Hot Big Bang: What happened in 1948, arXiv.1310.2146).
Fr.: pic de Gamow
In nuclear fusion, the product of the Maxwell-Boltzmann distribution with the tunnelling probability of the nuclei through their Coulomb barrier. This is the energy region where the reaction is more likely to take place: at higher energies, the number of particles becomes insignificant while at lower energies the tunnelling through the Coulomb barrier makes the reaction improbable.