A15 road (England) A15 road (England) The A15 is a major road in England. It runs north from Peterborough via Market Deeping, Bourne, Sleaford and Lincoln along a variety of ancient, Roman, and Turnpike alignments before it is interrupted at its junction with the M180 near Scawby. The road restarts east, and then continues north past Barton-upon-Humber, crossing the Humber on the Humber Bridge before terminating at Hessle near Kingston upon Hull. According to the AA, the route is long, and should take 2 hours. Norman Cross – Bourne takes 33 minutes, Bourne to Lincoln takes 46 minutes and Lincoln to the Humber
A15 phases tungsten was examined. Discussion of whether the β–tungsten structure is an allotrope of tungsten or the structure of a tungsten suboxide was long-standing, and even in 1998 articles about the discussion were published. It seems most likely the material is a true allotrope of tungsten. The first inter-metallic compound discovered with typical AB composition was chromium silicide CrSi, discovered in 1933. Several other compounds with A15 structure were discovered in following years. No large interest existed in research on those compounds. This changed with the discovery that vanadium silicide VSi showed superconductivity at around 17 K in 1953. In following