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A pinnacle of production using a Jacquard machine is a prayer book, woven in silk, entitled Livre de Prières. Tissé d'après les enluminures des manuscrits du XIVe au XVIe siècle. [22] All 58 pages of the prayer book were woven silk, made with a Jacquard machine using black and gray thread, at 160 threads per cm (400 threads per inch).
The first reported commercialisation of a stereoregular poly-1,4-isoprene with > 90% cis (90% to 92%) was in 1960 by the Shell Chemical Company.Shell used an alkyl lithium catalyst. 90% cis-1,4 content proved insufficiently crystalline to be useful.
After this first reported synthesis, few chemists were interested in polyacetylene because the product of Natta's preparation was an insoluble, air sensitive, and infusible black powder. The next major development of polyacetylene polymerization was made by Hideki Shirakawa’s group who were able to prepare silvery films of polyacetylene.
Jersey fabric originated in the Channel Islands, particularly on the island of Jersey, where it was traditionally used for underwear and sweaters for fishermen.This versatile fabric has historical roots dating back to the Middle Ages, when Jersey was a significant exporter of knitted goods. [1]
Polyetherimide (PEI; branded as Ultem [1]) is an amorphous, amber-to-transparent thermoplastic with characteristics similar to the related plastic PEEK.When comparing PEI to PEEK, the former is cheaper but has lower impact strength and a tighter temperature range.
We start with an urn with black balls. When drawing a ball from the urn, if we draw a black ball, put the ball back along with a new ball of a new non-black color randomly generated from a uniform distribution over an infinite set of available colours, and consider the newly generated color to be the "value" of the draw. Otherwise, put the ball ...