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  2. Rolling code - Wikipedia

    en.wikipedia.org/wiki/Rolling_code

    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.

  3. Technetium-99m generator - Wikipedia

    en.wikipedia.org/wiki/Technetium-99m_generator

    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 ...

  4. List of small modular reactor designs - Wikipedia

    en.wikipedia.org/wiki/List_of_small_modular...

    Based on the Economic Simplified Boiling Water Reactor designs by General Electric (GE), the NMR is a natural circulation SMR with an electric output of 50 MWe. The NMR has a much shorter Reactor Pressure Vessel compared to conventional BWRs. The coolant steam drives the turbines directly, eliminating the need for a steam generator.

  5. Enjoy 50% off a Sam's Club annual membership today - AOL

    www.aol.com/lifestyle/sams-club-membership-deal...

    $25/per year $50 Save $25 As a Sam's Club member, you'll get access to thrifty bulk buys (hello, paper towels and toilet paper!) and exclusive discounts on everything from furniture to electronics.

  6. Pulse-width modulation - Wikipedia

    en.wikipedia.org/wiki/Pulse-width_modulation

    When a digital signal spends more time in the on state than the off state, it has a duty cycle of >50%. When a digital signal spends more time in the off state than the on state, it has a duty cycle of <50%. Here is a pictorial that illustrates these three scenarios: History. The Corliss steam engine was patented in 1849. It used pulse-width ...

  7. Negawatt market - Wikipedia

    en.wikipedia.org/wiki/Negawatt_market

    According to the Negawatt Power Solutions Group, a "building that achieved a 50% energy cost reduction may be eligible for tax deduction up to $1.80 per square foot." Negawatts can help alleviate some of the costs of constructing new, efficient buildings. "The negawatt revolution now provides a way to cut construction costs, capture big returns ...

  8. Rolls-Royce Trent - Wikipedia

    en.wikipedia.org/wiki/Rolls-Royce_Trent

    The engine family is named after the River Trent, a name previously used for the RB.50, Rolls-Royce's first working turboprop engine; and the 1960s RB.203, a 9,980 lbf (44.4 kN) bypass turbofan and the first three-spool engine, designed to replace the Spey but never introduced. In 2019, Rolls-Royce delivered 510 Trent engines. Design

  9. Broadcasting in the United States - Wikipedia

    en.wikipedia.org/wiki/Broadcasting_in_the_United...

    [citation needed] Success in this experiment created a need for more advanced equipment, including an alternating-current generator large enough to produce the necessary power to carry his transmissions. Fessenden received the backing of T.H. Given and Hay Walker Jr. who contributed money to purchase a powerful generator from General Electric.

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