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  2. Homopolar generator - Wikipedia

    en.wikipedia.org/wiki/Homopolar_generator

    A homopolar generator is a DC electrical generator comprising an electrically conductive disc or cylinder rotating in a plane perpendicular to a uniform static magnetic field. A potential difference is created between the center of the disc and the rim (or ends of the cylinder) with an electrical polarity that depends on the direction of ...

  3. Hamming code - Wikipedia

    en.wikipedia.org/wiki/Hamming_code

    Since [7, 4, 3] = [n, k, d] = [2 m − 1, 2 m − 1 − m, 3]. The parity-check matrix H of a Hamming code is constructed by listing all columns of length m that are pair-wise independent. Thus H is a matrix whose left side is all of the nonzero n-tuples where order of the n-tuples in the columns of matrix does not matter.

  4. 2 - Wikipedia

    en.wikipedia.org/wiki/2

    When written in base 10, all multiples of 2 will end in 0, 2, 4, 6, or 8. [ 3 ] 2 is the smallest and the only even prime number , and the first Ramanujan prime . [ 4 ]

  5. Flywheel energy storage - Wikipedia

    en.wikipedia.org/wiki/Flywheel_energy_storage

    NASA G2 flywheel. Flywheel energy storage (FES) works by accelerating a rotor to a very high speed and maintaining the energy in the system as rotational energy.When energy is extracted from the system, the flywheel's rotational speed is reduced as a consequence of the principle of conservation of energy; adding energy to the system correspondingly results in an increase in the speed of the ...

  6. Binary Golay code - Wikipedia

    en.wikipedia.org/wiki/Binary_Golay_code

    Lexicographic code: Order the vectors in V lexicographically (i.e., interpret them as unsigned 24-bit binary integers and take the usual ordering). Starting with w 0 = 0, define w 1, w 2, ..., w 12 by the rule that w n is the smallest integer which differs from all linear combinations of previous elements in at least eight coordinates.

  7. History of Amazon - Wikipedia

    en.wikipedia.org/wiki/History_of_Amazon

    Amazon launches Free Super Saver Shipping, which allows customers to get free shipping for orders above $99. [97] 2002: March: Legal, Competition: Amazon settles its October 1999 patent infringement suit against Barnes & Noble (over its 1-Click checkout system, which it received a patent for in September 1999). It originally charged that Barnes ...

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