Superconducting radio frequency (SRF) cavities for particle accelerators are fabricated using high purity niobium to allow for continuous high power operation. A hot-spot generated at a surface defect during accelerator operation can quench superconductivity and limit its performance. Increased heat conduction to the liquid helium bath dissipates hot spots, maintaining performance. Properly tre...

This study provides an up to date review of tannins, specifically quebracho, in mineral processing and metallurgical processes. Quebracho is a highly useful reagent in many flotation applications, acting as both a depressant and a dispersant. Three different types of quebracho are mentioned in this study; quebracho “S” or Tupasol ATO, quebracho “O” or Tupafin ATO, and quebracho “A” or Silvafloc...

This article offers an overview and preliminary arrangements of literary texts, chosen paintings films (most them from the past three centuries) which feature motif lead. The presence lead as a symbol has been detected in poetry treated problem war peace; occasionally this use occurred relation to printing, typesetting, – less frequently children’s toys. Much more often used works introduce top...