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Faraday cage demonstration on volunteers in the Palais de la Découverte in Paris EMI shielding around an MRI machine room Faraday shield at a power plant in Heimbach, Germany. A Faraday cage or Faraday shield is an enclosure used to block some electromagnetic fields.
A beacon is an intentionally conspicuous device designed to attract attention to a specific location. A common example is the lighthouse , which draws attention to a fixed point that can be used to navigate around obstacles or into port.
802.11 Beacon frame. A beacon frame is a type of management frame in IEEE 802.11 WLANs. It contains information about the network. Beacon frames are transmitted periodically; they serve to announce the presence of a wireless LAN and to provide a timing signal to synchronise communications with the devices using the network (the members of a service set).
With the help of a Bluetooth beacon, a smartphone's software can approximately find its relative location to a Bluetooth beacon in a store. Brick and mortar retail stores use the beacons for mobile commerce , offering customers special deals through mobile marketing , [ 6 ] and can enable mobile payments through point of sale systems.
Squirrel-cage induction motors are very prevalent in industry, in sizes from below 1 kilowatt (1.3 hp) up to tens of megawatts (tens-of-thousand horsepower). They are simple, rugged, and self-starting, and maintain a reasonably constant speed from light load to full load, set by the frequency of the power supply and the number of poles of the ...
The aircraft emergency frequency (also known in the USA as Guard) is a frequency used on the aircraft band reserved for emergency communications for aircraft in distress.The frequencies are 121.5 MHz for civilian, also known as International Air Distress (IAD), International Aeronautical Emergency Frequency, [1] or VHF Guard, [1] and 243.0 MHz—the second harmonic of VHF guard—for military ...
Bipedal shark-like creature (referred as "lizard" on its toy version's instructions) [184] Appears in Grimlock's New Brain. First speaks in Money Is Everything. The Rebirth (Part 3) Jim Cummings: Alive Rippersnapper is a nasty land shark [185] who has two legs and his inferiority complex is massive. Because of this he takes his frustration out ...
This is a list of longest prison sentences served by a single person, worldwide, without a period of freedom followed by a second conviction. These cases rarely coincide with the longest prison sentences given, because some countries have laws that do not allow sentences without parole or for convicts to remain in prison beyond a given number of years (regardless of their original conviction).