RFA Wave Knight Conducting RAS Operations. Replenishment at sea (RAS) (North Atlantic Treaty Organisation/Commonwealth of Nations) or Underway replenishment (UNREP) (US Navy) is a method of transferring fuel, munitions, and stores from one ship to another while under way. 1 History 1.1 Concept.
The international non-profit organization Council on Tall Buildings and Urban Habitat (CTBUH) was formed in 1969 and announces the title of The World's Tallest Building and sets the standards by which buildings are measured. It maintains a list of the 100 tallest completed buildings in the world. The organization currently ranks Burj Khalifa in Dubai as the tallest at 828 m (2,717 ft).
Completed in 2009, the Burj Khalifa, in Dubai (United Arab Emirates), is currently the tallest skyscraper in the world, with a height of 829.8 metres (2,722 ft). It shows a typical skyscraper feature: setbacks. A skyscraper is a tall, continuously habitable building having multiple floors. When the term was originally used in the 1880s it described a building of 10 to 20 floors but now describes one of at least 40â50 floors.