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Polyacrylonitrile (PAN) is a synthetic, semicrystalline organic polymer resin, with the linear formula (CH 2 CHCN) n. [2] Almost all PAN resins are copolymers with acrylonitrile as the main monomer .
In the United States, the National Weather Service has standardized its measurements on the Class A evaporation pan, a cylinder with a diameter of 47.5 in (120.7 cm) that has a depth of 10 in (25 cm). The pan rests on a carefully leveled, wooden base and is often enclosed by a chain link fence to prevent animals drinking from it.
In soil science, agriculture and gardening, hardpan or soil pan is a dense layer of soil, usually found below the uppermost topsoil layer. [1] There are different types of hardpan, all sharing the general characteristic of being a distinct soil layer that is largely impervious to water .
Chapter 5 deals with Bolsheviks' postwar irrigation initiatives. Chapter 6 discusses the Soviet five-year plans and large-scale irrigation projects implemented in the 1930s, including the Vakhsh River irrigation project and the Great Ferghana Canal. The epilogue connects these historical developments to the Aral Sea crisis.
This may negatively affect the health of the population at the tail-end of the river basin and downstream of the irrigation scheme, as well as the ecological balance. The Aral Sea, for example, is seriously polluted by drainage water.
The general structural formula of a peroxyacyl nitrate peroxy acetyl nitrate, the most common PAN. In organic chemistry, peroxyacyl nitrates (also known as Acyl peroxy nitrates, APN or PANs) are powerful respiratory and eye irritants present in photochemical smog.
Aral AG (previously Veba Öl AG) is a German oil company established in 1898 as Westdeutsche Benzol-Verkaufs-Vereinigung GmbH (West German Benzene Marketing Corporation). The company is currently owned by British conglomerate BP [ 1 ] after it was purchased in 2002.
[5] Highmark Manufacturing uses Araldite epoxy resin in the manufacture of advanced ballistic protection body armour. [6] Schlösser Metallbau, a manufacturer of metal parts for railway carriages, uses Araldite epoxy resin to bond aluminium profiles of cab doorframes on the DBAG Class 423 Siemens Bombardier train. [7]