The Technology Portal
Selected article
In 1975, Stephen Hawking and Jacob Bekenstein showed that black holes should slowly radiate away energy, which poses a problem. From the no hair theorem one would expect the Hawking radiation to be completely independent of the material entering the black hole. Nevertheless, if the material entering the black hole were a pure quantum state, the transformation of that state into the mixed state of Hawking radiation would destroy information about the original quantum state. This violates Liouville's theorem and presents a physical paradox.
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News
- March 10: Man jailed after Facebook murder case in County Durham, England
- March 7: Paleontologists reaffirm the cause of dino extinction
- March 7: 10 billionth update placed on social networking website Twitter
- March 4: US reveals Internet security efforts
- March 3: Apple sues Taiwanese mobile phone maker HTC
- February 26: Russian Wikipedia reaches half a million articles
- February 14: Chip and PIN 'not fit for purpose', says Cambridge researcher
- February 14: Chicago Metra considers selling naming rights for train lines, stations
- February 13: Airborne laser successfully destroys ballistic missile
- February 10: Google introduces Google Buzz
Did you know...
- ... that both the Mozilla Firefox and Microsoft Internet Explorer web browser design ideas descended from the Mosaic web browser?
- ... that a coherer, hot wire barretter, electrolytic detector, cat's whisker and vacuum tube were all types of radio detectors?
- ... that in 2008 Hewlett-Packard created a prototype of the theoretical fourth and last passive circuit element, the memristor, that may one day revolutionize electronics, although the theory was devised in 1971?
- ... that a mercury arc rectifier converts alternating current to direct current by means of an electric arc through mercury vapor?
- ... that only one of the 266 1076 Class steam locomotives built for the Great Western Railway was named, and the rest had only numbers?
- ... that the six Charles Tayleur locomotives ordered by Isambard Kingdom Brunel for the Great Western Railway were unsuccessful?
- ... that the intensity of a tropical cyclone (pictured) is usually determined by the Dvorak technique using only visible and infrared satellite images?
- ... that the technique of double-balloon enteroscopy allows any position along the gastrointestinal tract to be visualized in real-time?
- Main outlines: Outline of science and Outline of technology
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- Main categories: Technology and Applied sciences
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- Agriculture • Agronomy • Architecture (Bridges, Portal) • Biotechnology • Electronics • Energy (Renewable energy) • Engineering • Hazardous Materials • Home improvement • Nanotechnology • Nuclear technology • Robotics
- Transport
- Aviation • Cars (Australian, Japanese) • Bicycles/Cycling • London transport • Nautical • Roads (U.S. Roads) • Spaceflight (Human spaceflight) • Trains (Rapid transit, UK Railways, UK Trams) • UK Waterways
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- Technology: Computer · Cryptography · Electronics · Engineer · Optics · Robotics · Telecommunications · Wireless
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