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A waterbed, water mattress, or flotation mattress is a bed or mattress filled with water. Waterbeds intended for medical therapies appear in various reports through the 19th century. The modern version, invented in San Francisco and patented in 1971, became a popular consumer item in the United States through the 1980s with up to 20% of the ...
Block diagram of feedback control of a dynamical process. Bode's sensitivity integral, discovered by Hendrik Wade Bode, is a formula that quantifies some of the limitations in feedback control of linear parameter invariant systems. Let L be the loop transfer function and S be the sensitivity function. In the diagram, P is a dynamical process ...
Neil Arnott by John Partridge. Dr Neil Arnott FRS LLD (15 May 1788 – March 1874) was a Scottish physician and inventor. He was the inventor of one of the first forms of the waterbed, the Arnott waterbed, and was awarded the Rumford Medal in 1852 for the construction of the smokeless fire grate, as well as other improvements to ventilation and heating.
Waterbed theory is the observation, ascribed to Larry Wall, that some systems, such as human and computer languages, contain a minimum amount of complexity, and that attempting to "push down" the complexity of such a system in one place will invariably cause complexity to "pop up" elsewhere. This behavior is likened to a waterbed mattress which ...
Stream bed. A woman digs in a dry stream bed in Kenya to find water during a drought. A streambed or stream bed is the bottom of a stream or river (bathymetry) and is confined within a channel, or the banks of the waterway. [1] Usually, the bed does not contain terrestrial (land) vegetation and instead supports different types of aquatic ...
Two common strategies are “greenwashing” and the “water bed effect” – both of which can lead to higher store prices. See: 8 Items To Stop Buying at Grocery Stores If You Want To Save Money
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