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  2. I-beam - Wikipedia

    en.wikipedia.org/wiki/I-beam

    The designation for each is given as the approximate height of the beam, the type (beam or column) and then the unit metre rate (e.g., a 460UB67.1 is an approximately 460 mm (18.1 in) deep universal beam that weighs 67.1 kg/m (135 lb/yd)).

  3. DIN 1025 - Wikipedia

    en.wikipedia.org/wiki/DIN_1025

    DIN 1025 is a DIN standard which defines the dimensions, masses and sectional properties of hot rolled I-beams.. The standard is divided in 5 parts: DIN 1025-1: Hot rolled I-sections - Part 1: Narrow flange I-sections, I-serie - Dimensions, masses, sectional properties

  4. Beam diameter - Wikipedia

    en.wikipedia.org/wiki/Beam_diameter

    The beam diameter or ... If the baseline value is small or subtracted out, the knife-edge beam width always corresponds to 60%, in the case of 20/80, or 80%, in the ...

  5. Gaussian beam - Wikipedia

    en.wikipedia.org/wiki/Gaussian_beam

    The shape of a Gaussian beam of a given wavelength λ is governed solely by one parameter, the beam waist w 0. This is a measure of the beam size at the point of its focus (z = 0 in the above equations) where the beam width w(z) (as defined above) is the smallest (and likewise where the intensity on-axis (r = 0) is the largest). From this ...

  6. I-joist - Wikipedia

    en.wikipedia.org/wiki/I-joist

    The rim joist depth must match the I-joist size. Mismatches can strain the joist. A similar situation occurs where the I-joist crosses a main beam. Installing squash blocks (2×4 materials 1 ⁄ 16 in or 1.6 mm higher than the I-joist) alongside the I-joists transfers the load from the I-joist onto the beam. Missed nails and glue setting too ...

  7. Diffraction-limited system - Wikipedia

    en.wikipedia.org/wiki/Diffraction-limited_system

    The beam quality factor M squared (M 2) is found by measuring the size of the beam at its waist, and its divergence far from the waist, and taking the product of the two, known as the beam parameter product. The ratio of this measured beam parameter product to that of the ideal is defined as M 2, so that M 2 =1 describes an

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