(plural ring topologies) (computing) A network topology in which, in the physical case, every node of a network is connected to exactly two other nodes: one node designated as upstream and the other as downstream. A given node receives data from its upstream node and sends data to its downstream node.
Image copyright. The price of Brent crude oil has fallen below $50 a barrel for the first time since May 2009. It fell more than a dollar to $49.92 a barrel in early trading on Wednesday before edging back above the $50 mark. Slowing global growth and increased supply of oil and gas have pushed prices sharply lower in recent weeks.
Moody's analysts say that if crude oil is $55 per barrel all year long â it was trading for $48 on Tuesday â fuel costs at seven of the biggest U.S. airlines will fall about $20 billion in 2015 compared with last year. Even with hedging give-backs, they will come out ahead by $15 billion, Moody's says.