sounding pulse
1Pulse detonation engine — A pulse detonation engine, or PDE , is a type of propulsion system that can operate from subsonic up to hypersonic speeds. In theory the PDE design can produce an engine with a burn efficiency higher than other designs, with considerably fewer… …
2pulse — I. noun Etymology: Middle English puls, probably from Anglo French puuiz gruel, from Latin pult , puls, probably from Greek poltos Date: 13th century the edible seeds of various crops (as peas, beans, or lentils) of the legume family; also a… …
3Echo sounding — pulses directed from the surface or from a submarine vertically down to measure the distance to the bottom by means of sound waves. HistoryAfter the disaster of the Titanic in 1912, the German physicist Alexander Behm conducted some research to… …
4Radio acoustic sounding system — A radio acoustic sounding system (RASS) is a system for measuring the atmospheric lapse rate using backscattering of radio waves from an acoustic wave front to measure the speed of sound at various heights above the ground. This is possible… …
5Red Dwarf — This article is about the British comedy franchise. For the type of star, see Red dwarf. Red Dwarf Red Dwarf logo (1988–99) Genre Sitcom Science fiction Black comedy …
6Weather radar — in Norman, Oklahoma with rainshaft …
7Sonar — This article is about underwater sound propagation. For atmospheric sounding, see SODAR. For other uses, see Sonar (disambiguation) …
8African music — Introduction the musical sounds and practices of all indigenous peoples of Africa, including the Berber in the Sahara and the San (Bushmen) and Khoikhoin (Hottentot) in Southern Africa. The music of European settler communities and that of… …
9Rhythm — For other uses, see Rhythm (disambiguation). Rhythm, a sequence in time repeated, featured in dance: an early moving picture demonstrates the waltz …
10Gramophone 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 …
