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  2. Spark testing - Wikipedia

    en.wikipedia.org/wiki/Spark_testing

    Spark testing of tool steel Spark testing of mild steel. Spark testing is a method of determining the general classification of ferrous materials. It normally entails taking a piece of metal, usually scrap, and applying it to a grinding wheel in order to observe the sparks emitted. [1]

  3. National pipe thread - Wikipedia

    en.wikipedia.org/wiki/National_pipe_thread

    MIP is an abbreviation for male iron pipe, and FIP is an abbreviation for female iron pipe. [2] Outside North America, some US pipe thread sizes are widely used, as well as many British Standard Pipe threads and ISO 7–1, 7–2, 228–1, and 228-2 threads.

  4. Solar zenith angle - Wikipedia

    en.wikipedia.org/wiki/Solar_zenith_angle

    It is the complement to the solar altitude or solar elevation, which is the altitude angle or elevation angle between the sun’s rays and a horizontal plane. [1] [2] At solar noon, the zenith angle is at a minimum and is equal to latitude minus solar declination angle. This is the basis by which ancient mariners navigated the oceans. [3]

  5. Genetic code - Wikipedia

    en.wikipedia.org/wiki/Genetic_code

    The code emerges at a transition when the mapping of codons to amino acids becomes nonrandom. The code's emergence is governed by the topology defined by the probable errors and is related to the map coloring problem. [109] Game theory: Models based on signaling games combine elements of game theory, natural selection and information channels ...

  6. Mathematics of three-phase electric power - Wikipedia

    en.wikipedia.org/wiki/Mathematics_of_three-phase...

    An important property of three-phase power is that the instantaneous power available to a resistive load, = =, is constant at all times.Indeed, let = = To simplify the mathematics, we define a nondimensionalized power for intermediate calculations, =

  7. Chord (geometry) - Wikipedia

    en.wikipedia.org/wiki/Chord_(geometry)

    The angle θ is taken in the positive sense and must lie in the interval 0 < θ ≤ π (radian measure). The chord function can be related to the modern sine function, by taking one of the points to be (1,0), and the other point to be ( cos θ , sin θ ), and then using the Pythagorean theorem to calculate the chord length: [ 2 ]

  8. Chemical bonding of water - Wikipedia

    en.wikipedia.org/wiki/Chemical_bonding_of_water

    As such, the predicted shape and bond angle of sp 3 hybridization is tetrahedral and 109.5°. This is in open agreement with the true bond angle of 104.45°. The difference between the predicted bond angle and the measured bond angle is traditionally explained by the electron repulsion of the two lone pairs occupying two sp 3 hybridized orbitals.

  9. Dynkin diagram - Wikipedia

    en.wikipedia.org/wiki/Dynkin_diagram

    Dynkin diagrams have been drawn in a number of ways; [15] the convention followed here is common, with 180° angles on nodes of valence 2, 120° angles on the valence 3 node of D n, and 90°/90°/180° angles on the valence 3 node of E n, with multiplicity indicated by 1, 2, or 3 parallel edges, and root length indicated by drawing an arrow on ...

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    electronic color code chart for lie angle diagram of iron pipe length size chart