mechanical noise
31Photoconductive atomic force microscopy — (pc AFM) is a scientific technique.. Multi layer photovoltaic cells have gained popularity since mid 1980s.[1] At the time, research was primarily focused on single layer photovoltaic (PV) devices between two electrodes, in which PV properties… …
32Gramophone record — A 12 inch (30 cm) 33⅓ rpm record (left), a 7 inch 45 rpm record (right), and a CD (above) A gramophone record, commonly known as a phonograph record (in American English), vinyl record (in reference to vinyl, the material most commonly used after …
33Hi-MD — In January 2004, Sony announced the Hi MD media storage format as a further development of the MiniDisc Format. [ [http://news.sel.sony.com/en/press room/consumer/portable audio/walkman players/release/8720.html Sony Introduces Hi MD press… …
34Acoustic signature — is used to describe a combination of acoustic emissions of ships and submarines. Contributing factorsThe acoustic signature is made up of a number of individual elements. These include:*Machinery noise: noise generated by a ships engines,… …
35Snowmobile — A snowmobile (known locally as snowmachine , snowsled or by the brandname Ski Doo ) is a land vehicle that is commonly propelled by a track or tracks at the rear and steered by skis at the front. Early snowmobiles used rubber tracks, however a… …
36Piston — For other uses, see Piston (disambiguation). Components of a typical, four stroke cycle, DOHC piston engine. (E) Exhaust camshaft, (I) Intake camshaft, (S) Spark plug, (V) Valves, (P) Piston, (R) Connecting rod, (C) Crankshaft, (W) Water jacket… …
37Adrian Belew — Background information Birth name Robert Steven Belew Born December 23, 1949 ( …
38Electric locomotive — Electric Trains redirects here. For the 1995 Squeeze single, see Electric Trains (song). An electric locomotive is a locomotive powered by electricity from an external source. Sources include overhead lines, third rail or an on board electricity… …
39Virginals — Virginal redirects here. For other uses, see Virginal (disambiguation). Virginals Flemish virginals (Paris, Musée de la Musique). Note the inset keyboard placed left of centre. Classification Keyboard instrument Playing rang …
40Antique radio — DIORA AGA RSZ 50 ca.1947 from Poland An antique radio is a radio receiving set that is collectible because of its age and rarity. Although collectors may differ on the cutoff dates, most would use 50 years old, or the pre World War II Era, for… …
