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The QR code system was invented in 1994, at the Denso Wave automotive products company, in Japan. The initial alternating-square design presented by the team of researchers, headed by Masahiro Hara, was influenced by the black counters and the white counters played on a Go board; the pattern of position detection was found and determined by applying the least-used ratio (1:1:3:1:1) in black ...
A technetium-99m generator, or colloquially a technetium cow or moly cow, is a device used to extract the metastable isotope 99m Tc of technetium from a decaying sample of molybdenum-99. 99 Mo has a half-life of 66 hours [1] and can be easily transported over long distances to hospitals where its decay product technetium-99m (with a half-life ...
The first flight of the Titan II was in March 1962 and the missile, now designated LGM-25C, reached initial operating capability in October 1963. The Titan II contained one W-53 nuclear warhead in a Mark 6 re-entry vehicle with a range of 8,700 nautical miles (10,000 mi; 16,100 km). The W-53 had a yield of 9 megatons.
Rolling code. A rolling code (or sometimes called a hopping code) is used in keyless entry systems to prevent a simple form of replay attack, where an eavesdropper records the transmission and replays it at a later time to cause the receiver to 'unlock'. Such systems are typical in garage door openers and keyless car entry systems.
Adult males are around 2.4 m (7 ft 10 in) long from nose to tail tip, and females average 2.05 m (6 ft 9 in), with overall ranges between 1.50 to 2.75 m (4 ft 11 in to 9 ft 0 in) nose to tail suggested for the species in general. Of this length, the tail typically accounts for 63 to 95 cm (25 to 37 in).
In the event of a loss of off-site power, emergency diesel generators (EDG) would automatically start in order to provide AC power. [9] [30] Two EDGs were available for each of units 1–5 and three for unit 6.
A cross section of the shore-end of a modern submarine communications cable. 1 – Polyethylene. 2 – Mylar tape. 3 – Stranded steel wires. 4 – Aluminium water barrier. 5 – Polycarbonate. 6 – Copper or aluminium tube. 7 – Petroleum jelly. 8 – Optical fibers.
Messenger, also known as Facebook Messenger, is an American proprietary instant messaging app and platform developed by Meta Platforms.Originally developed as Facebook Chat in 2008, the company revamped its messaging service in 2010, released standalone iOS and Android apps in 2011, and released standalone Facebook Portal hardware for Messenger calling in 2018.