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Singapore Airlines Boeing 747-400 scale display model Group of students with their wooden model airplanes in Sonta, Serbia, 1936.. A model aircraft is a physical model of an existing or imagined aircraft, and is built typically for display, research, or amusement.
Nickel forms simple binary compounds with non metals including halogens, chalcogenides, and pnictides. Nickel ions can act as a cation in salts with many acids, including common oxoacids. Salts of the hexaaqua ion (Ni ยท 6 H 2 O 2+) are especially well known. Many double salts containing nickel with another cation are known.
Nickel azide is an inorganic chemical compound with the formula Ni(N 3) 2. It can be formed through the reaction between nickel tetracarbonyl and iodine azide. [1]
Metallic nickel is precipitated by treating a solution of a nickel salt with an excess of zinc. [3] [1] This precipitated nickel contains relatively large amounts of zinc and zinc oxide. Then the catalyst is activated by digesting with either base or acid. There are different designations for differently prepared Urushibara nickel catalysts. [4]
The Big Nickel in 2014. The idea for the Big Nickel began in 1963 when Ted Szilva, at the time a 28-year-old City of Sudbury fireman, read in the Sudbury Star of a contest, sponsored by the Sudbury Canada Centennial Committee (Maurice Lacourciere, Chairman), asking Sudbury residents how the City should celebrate the upcoming Canadian Centennial.
Various collaborative online encyclopedias were attempted before the start of Wikipedia, but with limited success. [19] Wikipedia began as a complementary project for Nupedia, a free online English-language encyclopedia project whose articles were written by experts and reviewed under a formal process. [20]
Schematic of a permanent magnet motor. A permanent magnet motor is a type of electric motor that uses permanent magnets for the field excitation and a wound armature. The permanent magnets can either be stationary or rotating; interior or exterior to the armature for a radial flux machine or layered with the armature for an axial flux topology.
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