The genus Vaucheria (Xanthophyceae) in Russia: morphotaxonomic diversity and distribution

During 2011–2020, the Vaucheria species of Russia have been studied in terms of morphotaxonomic diversity and regional distribution. Twenty-nine species and varieties were identified on the base of microscopical observation of 1230 fertile specimens. Of these, 15 species and varieties are reported for Russia for the first time. The regional Vaucheria diversity is differentiated by habitats, which differ in degree of humidity, as well as frequency of inundation.

Influence Research on Passivation to Abrasion Behaviour of Coated Milling Cutter Edge of Wheel

The innovative use of surface shot-peering to make a passivation at milling cutting edge of wheel, it shows that passivation has eliminated all microcrack and abrasion trace on the surface of milling cutting edge through microscopical observation, so as to improve adhesive force among the coating and cutter body, to make an uniform wear of cutter with coating during machine work, and further to keep fairly good function of cutting edge. Furthermore, the milling length of wheel cutter is over 8 meters, and such technology has solved the technology problem in production domesticization of wheel cutter.