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  2. List of reagent testing color charts - Wikipedia

    en.wikipedia.org/wiki/List_of_reagent_testing...

    It is advised to check the references for photos of reaction results. [1] Reagent testers might show the colour of the desired substance while not showing a different colour for a more dangerous additive. [2] For this reason it is essential to use multiple different tests to show all adulterants.

  3. 25-pair color code - Wikipedia

    en.wikipedia.org/wiki/25-pair_color_code

    Older Bell System wiring inside customer premises used a cable type with four conductors of solid copper wire with the insulation colors red, green, yellow, and black (legacy) or a two-color code of blue, orange, and white.

  4. Bell curve (disambiguation) - Wikipedia

    en.wikipedia.org/wiki/Bell_curve_(disambiguation)

    Bell curve may also refer to: Gaussian function, a specific kind of function whose graph is a bell-shaped curve; The Bell Curve, a 1994 book by Richard J. Herrnstein and Charles Murray The Bell Curve Debate, a 1995 book on The Bell Curve edited by Jacoby and Glauberman; Bell curve grading, a method of evaluating scholastic performance

  5. Gaussian function - Wikipedia

    en.wikipedia.org/wiki/Gaussian_function

    The graph of a Gaussian is a characteristic symmetric "bell curve" shape. The parameter a is the height of the curve's peak, b is the position of the center of the peak, and c (the standard deviation, sometimes called the Gaussian RMS width) controls the width of the "bell".

  6. Train communication network - Wikipedia

    en.wikipedia.org/wiki/Train_communication_network

    a) select the wireless network on the basis of QoS parameters requested by the application; b) allow TCMS and/or OMTS applications, installed on-board and communicating on the on-board communication network, to have a remote access to applications running on ground installations; c) allow applications running on ground installations to have a ...

  7. Communications-based train control - Wikipedia

    en.wikipedia.org/wiki/Communications-based_train...

    CBTC is a signalling standard defined by the IEEE 1474 standard. [1] The original version was introduced in 1999 and updated in 2004. [1] The aim was to create consistency and standardisation between digital railway signalling systems that allow for an increase in train capacity through what the standard defines as high-resolution train location determination. [1]

  8. Bell Labs Technical Journal - Wikipedia

    en.wikipedia.org/wiki/Bell_Labs_Technical_Journal

    The journal was originally established as the Bell System Technical Journal (BSTJ) in New York by the American Telephone and Telegraph Company (AT&T) in 1922. It was published under this name until 1983, when the breakup of the Bell System placed various parts of the companies in the system into independent corporate entities.

  9. Circle Chart - Wikipedia

    en.wikipedia.org/wiki/Circle_Chart

    Download Chart download 200 ... V Coloring Chart video ringback tones 100 V Coloring app usage volume in South Korea; ... Bell Chart 100