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61Optical decay — is process of relaxation of excitation of an excited quantum system, usually due to the spontaneous emission of a photon or a phonon. Optical decay is dominant mechanism of quenching of excitation of active optical media. In solid state lasers… …
62alkaline-earth metal — /al keuh luyn errth , lin /, Chem. any of the group of bivalent metals including barium, radium, strontium, calcium, and, usually, magnesium, the hydroxides of which are alkalis but less soluble than those of the alkali metals. [1900 05] * * * ▪… …
63Ammonia — For other uses, see Ammonia (disambiguation). Ammonia …
64Light-emitting diode — LED redirects here. For other uses, see LED (disambiguation). Light emitting diode Red, pure green and blue LEDs of the 5mm diffused type Type Passive, optoelectronic Working principle Electr …
65Quantum chromodynamics — Standard model of particle physics Standard Model …
66Electric power transmission — Electric transmission redirects here. For vehicle transmissions, see diesel electric transmission. 400 kV high tension transmission lines near Madrid Electric power transmission or high voltage electric transmission is the bulk transfer of… …
67Acetic acid — Acetic redirects here. It is not to be confused with Ascetic. Acetic acid …
68High-voltage direct current — HVDC or high voltage, direct current electric power transmission systems contrast with the more common alternating current systems as a means for the bulk transmission of electrical power. The modern form of HVDC transmission uses technology… …
69Henry Cavendish — Infobox Scientist name = Henry Cavendish box width = image width = 240px caption = Henry Cavendish birth date = birth date|df=yes|1731|10|10 birth place = Nice, France death date = death date and age|df=yes|1810|02|24|1731|10|10 death place =… …
70Spark plug — A spark plug (also, very rarely nowadays, in British English: a sparking plug) is an electrical device that fits into the cylinder head of some internal combustion engines and ignites compressed aerosol gasoline by means of an electric spark.… …
