vertical riser
41Cracking (chemistry) — In petroleum geology and chemistry, cracking is the process whereby complex organic molecules such as kerogens or heavy hydrocarbons are broken down into simpler molecules such as light hydrocarbons, by the breaking of carbon carbon bonds in the… …
42Neil Peart — For the Australian rules footballer, see Neil Peart (footballer). Neil Peart Peart performing a drum solo at the Xcel Energy Center on May 22, 2008. Photo by Matt Becker Background information …
43Powered hang glider — A foot launched powered hang glider (FLPHG), also called powered harness, nanolight or hangmotor, is a powered hang glider harness with a motor and propeller in pusher configuration. An ordinary hang glider is used for its wing and control frame …
44river — river1 riverless, adj. riverlike, adj. /riv euhr/, n. 1. a natural stream of water of fairly large size flowing in a definite course or channel or series of diverging and converging channels. 2. a similar stream of something other than water: a… …
45arts, East Asian — Introduction music and visual and performing arts of China, Korea, and Japan. The literatures of these countries are covered in the articles Chinese literature, Korean literature, and Japanese literature. Some studies of East Asia… …
46Electric aircraft — Infobox Aviation name = Electric aircraft caption = Helios electric powered UAVAn electric aircraft is an aircraft that runs on electric motors rather than internal combustion engines, with electricity coming from fuel cells, solar cells,… …
47Steel square — Carpenter s square redirects here. For the plant, see Scrophularia marilandica. The steel square is a tool that carpenters and other tradesmen use. Today the steel square is more commonly referred to as the framing square. It consists of a large… …
48Deepwater Horizon — This article is about the drilling rig. For the explosion and oil spill, see Deepwater Horizon (disambiguation). Deepwater Horizon semi submersible drilling rig. Career …
49Continuous casting — The macrostructure of continuously cast copper (99.95% pure), etched, ∅ ≈ 83 mm. Continuous casting, also called strand casting, is the process whereby molten metal is solidified into a semifinished billet, bloom, or slab for subsequent rolling… …
50Elevator — For other uses, see Elevator (disambiguation). A set of lifts in the lower level of a London Underground station. The arrows indicate each elevator s position and direction of travel …
