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The Emerson "Heat Fan", the first ceiling fan to use a stack motor A close-up of the dropped flywheel on a FASCO "Charleston" ceiling fan Stack-motor ceiling fans. In the late 1970s, due to rising energy costs prompted by the energy crisis , Emerson adapted their "K63" motor, commonly used in household appliances and industrial machinery, to be ...
The subsidiary of M-Systems called EUROM was established to design, build and sell the DOC to the U.S. and Asian embedded computer distributors. The first customer for the DOC was Ampro. David Feldman, President of Ampro and Rick Iorillo, President of EUROM U.S. completed the first deal with IBM to supply 2MB embedded flash drives for recording ...
Where noise is an issue, larger, slower-turning fans are quieter than smaller, faster fans that can move the same airflow. Fan noise has been found to be roughly proportional to the fifth power of fan speed; halving the speed reduces the noise by about 15 dB. [22] Axial fans may rotate at speeds of up to around 38,000 rpm for smaller sizes. [23]
Thunder is the sound caused by lightning. [1] [2] [3] Depending upon the distance from and nature of the lightning, it can range from a long, low rumble to a sudden, loud crack. The sudden increase in temperature and hence pressure caused by the lightning produces rapid expansion of the air in the path of a lightning bolt. [4]
Lightning is detected remotely using sensors that detect cloud-to-ground lightning strokes with 95 percent accuracy in detection and within 250 metres (820 ft) of their point of origin. [ 105 ] Summer storm in 19th-century Polish countryside – picture by Jozef Chelmonski , 1896, 107 cm (42.1 in)x163 cm (64.1 in), National Museum in Cracow
A pinch (or: Bennett pinch [2] (after Willard Harrison Bennett), electromagnetic pinch, [3] magnetic pinch, [4] pinch effect, [5] or plasma pinch. [6]) is the compression of an electrically conducting filament by magnetic forces, or a device that does such.
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