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  2. List of space groups - Wikipedia

    en.wikipedia.org/wiki/List_of_space_groups

    The possible screw axes are: 2 1, 3 1, 3 2, 4 1, 4 2, 4 3, 6 1, 6 2, 6 3, 6 4, and 6 5. Wherever there is both a rotation or screw axis n and a mirror or glide plane m along the same crystallographic direction, they are represented as a fraction or n/m.

  3. Home Depot - Wikipedia

    en.wikipedia.org/wiki/Home_Depot

    The net earnings for the period of three months (ending August 2) rose 27% up to $4.3 billion. The growth in the sales was a result of Americans staying at home as a result of the COVID-19 pandemic. [50] In the Q3 for 2020, ending November 1, Home Depot reported a revenue of $33.5 billion; it represents a year-on-year increase of 24 per cent. [51]

  4. Quaternary numeral system - Wikipedia

    en.wikipedia.org/wiki/Quaternary_numeral_system

    v. t. e. Quaternary / kwəˈtɜːrnəri / is a numeral system with four as its base. It uses the digits 0, 1, 2, and 3 to represent any real number. Conversion from binary is straightforward. Four is the largest number within the subitizing range and one of two numbers that is both a square and a highly composite number (the other being thirty ...

  5. Scherrer equation - Wikipedia

    en.wikipedia.org/wiki/Scherrer_Equation

    It is named after Paul Scherrer. [1][2] It is used in the determination of size of crystals in the form of powder. The Scherrer equation can be written as: τ {\displaystyle \tau = {\frac {K\lambda } {\beta \cos \theta }}} where: τ {\displaystyle \tau } is the mean size of the ordered (crystalline) domains, which may be smaller or equal to the ...

  6. Geometric series - Wikipedia

    en.wikipedia.org/wiki/Geometric_series

    e. In mathematics, a geometric series is a series summing the terms of an infinite geometric sequence, in which the ratio of consecutive terms is constant. Each term is the geometric mean of the term before it and the term after it, in the same way that the terms of an arithmetic series are the arithmetic means of their neighbors.

  7. National pipe thread - Wikipedia

    en.wikipedia.org/wiki/National_pipe_thread

    The half-angle (between the taper surface and the axis of the pipe) is arctan(1 ⁄ 32) ≈ 1.7899° ≈ 1° 47′. The standard for Nominal Pipe Size (often abbreviated NPS, which should not be confused with the abbreviation NPS for the straight thread form standard) is loosely related to the inside diameter of Schedule 40 series of sizes.

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