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Diesel exhaust fluid (DEF; also known as AUS 32 and sometimes marketed as AdBlue [3]) is a liquid used to reduce the amount of air pollution created by a diesel engine. Specifically, DEF is an aqueous urea solution made with 32.5% urea and 67.5% deionized water .
The structure of the molecule of urea is O=C(−NH 2) 2.The urea molecule is planar when in a solid crystal because of sp 2 hybridization of the N orbitals. [8] [9] It is non-planar with C 2 symmetry when in the gas phase [10] or in aqueous solution, [9] with C–N–H and H–N–H bond angles that are intermediate between the trigonal planar angle of 120° and the tetrahedral angle of 109.5°.
Selective catalytic reduction (SCR) injects a reductant such as ammonia or urea — the latter aqueous, where it is known as diesel exhaust fluid (DEF) — into the exhaust of a diesel engine to convert nitrogen oxides (NO x) into gaseous nitrogen and water.
Quirky Tiling Any over-personalized renovation can hurt the value of a home, especially something like tiling, which requires more effort and money to replace, said Bob Gordon, realtor and blogger ...
Crittall Windows Ltd is an English manufacturer of steel-framed windows, today based in Witham, Essex, close to its historic roots in the county. Its products have been used in thousands of buildings across the United Kingdom, including the Houses of Parliament and Tower of London , and are features particularly associated with the Art Deco and ...
A window screen (also known as insect screen, bug screen, fly screen, flywire, wire mesh, or window net) is designed to cover the opening of a window. It is usually a mesh made of metal, fibreglass , plastic wire, or other pieces of plastic and stretched in a frame of wood or metal.
Factory buildings often are built with clerestory windows; modern housing designs sometimes include them as well. Modern clerestory windows may have another especially important role, besides daylighting and ventilation: they can be part of passive solar strategies, in very energy-efficient buildings (passive houses and zero-energy buildings). [5]
Methylenebis(dibutyldithiocarbamate) is an additive in some extreme pressure gear oils, serving as an antioxidant and protecting metal surfaces. [ 1 ] The early extreme pressure additives were based on lead salts of fatty acids ("lead soaps "), "active sulfur" compounds (e.g. thiols and elementary sulfur), and chlorinated compounds.
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