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  2. Robinson–Foulds metric - Wikipedia

    en.wikipedia.org/wiki/Robinson–Foulds_metric

    The Robinson–Foulds or symmetric difference metric, often abbreviated as the RF distance, is a simple way to calculate the distance between phylogenetic trees. [1]It is defined as (A + B) where A is the number of partitions of data implied by the first tree but not the second tree and B is the number of partitions of data implied by the second tree but not the first tree (although some ...

  3. HP-65 - Wikipedia

    en.wikipedia.org/wiki/HP-65

    HP-65 in original hard case with manuals, software "Standard Pac" of magnetic cards, soft leather case, and charger The HP-65 is the first magnetic card-programmable handheld calculator. Introduced by Hewlett-Packard in 1974 at an MSRP of $795 [ 1 ] (equivalent to $4,912 in 2023) [ 2 ] , it featured nine storage registers and room for 100 ...

  4. Smith chart - Wikipedia

    en.wikipedia.org/wiki/Smith_chart

    The Smith chart (sometimes also called Smith diagram, Mizuhashi chart (水橋チャート), Mizuhashi–Smith chart (水橋スミスチャート), [1] [2] [3] Volpert–Smith chart (Диаграмма Вольперта—Смита) [4] [5] or Mizuhashi–Volpert–Smith chart) is a graphical calculator or nomogram designed for electrical and electronics engineers specializing in radio ...

  5. Retardation factor - Wikipedia

    en.wikipedia.org/wiki/Retardation_factor

    An R F value will always be in the range 0 to 1; if the substance moves, it can only move in the direction of the solvent flow, and cannot move faster than the solvent. For example, if particular substance in an unknown mixture travels 2.5 cm and the solvent front travels 5.0 cm, the retardation factor would be 0.50.

  6. List of Sinclair calculators - Wikipedia

    en.wikipedia.org/wiki/List_of_Sinclair_calculators

    This is a list of calculators produced by Clive Sinclair's company Sinclair Radionics: . Sinclair Cambridge. Sinclair Cambridge Scientific; Sinclair Cambridge Memory; Sinclair Cambridge Memory %

  7. Chromatographic response function - Wikipedia

    en.wikipedia.org/wiki/Chromatographic_response...

    They are the smallest difference between sorted RF values, or product of such differences. Another function is the multispot response function (MRF) as developed by De Spiegeleer et al.{Analytical Chemistry (1987):59(1),62-64} It is based also of differences product. This function always lies between 0 and 1.

  8. Amazon hits $2 trillion in valuation on AI fervor, rate cut bets

    www.aol.com/news/amazon-hits-2-trillion...

    The stock rose 3.4% to $192.70, giving the e-commerce giant a market value of over $2 trillion and putting it in the same club as technology heavyweights Microsoft Corp, Apple Inc, Nvidia Corp and ...

  9. Response factor - Wikipedia

    en.wikipedia.org/wiki/Response_factor

    The response factor can be expressed on a molar, volume or mass [1] basis. Where the true amount of sample and standard are equal: = where A is the signal (e.g. peak area) and the subscript i indicates the sample and the subscript st indicates the standard. [2]

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