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  2. Substitute checks in the United States - Wikipedia

    en.wikipedia.org/wiki/Substitute_checks_in_the...

    A substitute check (also called an Image Replacement Document or IRD) [1] is a negotiable instrument that is a digital reproduction of an original paper check.As a negotiable payment instrument in the United States, a substitute check maintains the status of a "legal check" in lieu of the original paper check, as authorized by the Check Clearing for the 21st Century Act (the Check 21 Act).

  3. BLOSUM - Wikipedia

    en.wikipedia.org/wiki/BLOSUM

    Positive and zero values have been highlighted. In bioinformatics, the BLOSUM (BLO cks SU bstitution M atrix) matrix is a substitution matrix used for sequence alignment of proteins. BLOSUM matrices are used to score alignments between evolutionarily divergent protein sequences. They are based on local alignments.

  4. Substitution cipher - Wikipedia

    en.wikipedia.org/wiki/Substitution_cipher

    In cryptography, a substitution cipher is a method of encrypting in which units of plaintext are replaced with the ciphertext, in a defined manner, with the help of a key; the "units" may be single letters (the most common), pairs of letters, triplets of letters, mixtures of the above, and so forth.

  5. Tritone substitution - Wikipedia

    en.wikipedia.org/wiki/Tritone_substitution

    The substitute dominant may be used as a pivot chord in modulation. [11] Since it is the dominant chord a tritone away, the substitute dominant may resolve down a fifth, to a tonic chord a tritone away from the previous tonic (for example, in F one may feature a ii–V on C, which with a substitute dominant resolves to G ♭, a distant key from ...

  6. 1N4148 signal diode - Wikipedia

    en.wikipedia.org/wiki/1N4148_signal_diode

    The 1N4148 is a standard silicon switching signal diode. It is one of the most popular and long-lived switching diodes because of its dependable specifications and low cost. Its name follows the JEDEC nomenclature. The 1N4148 is useful in switching applications up to about 100 MHz with a reverse-recovery time of no more than 4 ns.

  7. 1968 Thule Air Base B-52 crash - Wikipedia

    en.wikipedia.org/wiki/1968_Thule_Air_Base_B-52_crash

    The extreme heat generated by the burning of 225,000 pounds (102 t) of jet fuel during the five to six hours after the crash melted the ice sheet, causing wreckage and munitions to sink to the ocean floor. [citation needed] Inuit around the base worked with the U.S. Air Force to get to the B-52 crash. The sleds were the only way to get to the ...

  8. Common logarithm - Wikipedia

    en.wikipedia.org/wiki/Common_logarithm

    Common logarithm. A graph of the common logarithm of numbers from 0.1 to 100. In mathematics, the common logarithm is the logarithm with base 10. [1] It is also known as the decadic logarithm and as the decimal logarithm, named after its base, or Briggsian logarithm, after Henry Briggs, an English mathematician who pioneered its use, as well as ...

  9. Log-normal distribution - Wikipedia

    en.wikipedia.org/wiki/Log-normal_distribution

    This is justified by considering the central limit theorem in the log domain (sometimes called Gibrat's law). The log-normal distribution is the maximum entropy probability distribution for a random variate X —for which the mean and variance of ln (X) are specified.