Tubular daylight devices (TDDs) require a much smaller roof opening than conventional skylights and, because of their highly reflective tube, they can deliver farther away from the building envelope. This provide lighting energy savings, increasing resilience in new and existing buildings. Different types configurations are available amongst commercially TDDs, including domes/diffusers with var...

A keyboard the main input device for a computer. A standard computer keyboard comprises of a base stand, a membrane circuit board with pressure sensors and several keys with a key pressing mechanism. A standard keyboard has four sections on the keyboard, a text entry section, a navigation section, a numeric section and a function key section. Each section comprises of several keys. The number o...

A detailed study of a 60 x 150 km area at 60øW, 24øN at the eastern end of the Nares Abyssal Plain indicates that hydrothermal circulation is still active in the 80 m.y.B.P. oceanic crust. The 58 heat flow measurements made at five stations in the area have revealed (1) constant heat flow over the abyssal plain (56 mW m-2), (2) a cyclic heat flow over the abyssal hills (mean of 77 mW m-2), and ...