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  2. Via fence - Wikipedia

    en.wikipedia.org/wiki/Via_fence

    Via hole equivalent circuit. The design of the fence needs to consider the size and spacing of the vias. Ideally, vias should act as short circuits, but they are not ideal and a via equivalent circuit can be modelled as a shunt inductance. Sometimes, a more complex model is required such as the equivalent circuit shown in figure 4.

  3. Drainage equation - Wikipedia

    en.wikipedia.org/wiki/Drainage_equation

    the design drain spacing (L) can be found from the equation in dependence of the drain depth (Dd) and drain radius (r). Drainage criteria One would not want the water table to be too shallow to avoid crop yield depression nor too deep to avoid drought conditions. This is a subject of drainage research.

  4. 19-inch rack - Wikipedia

    en.wikipedia.org/wiki/19-inch_rack

    The size denotes the width of the faceplate for the installed equipment. The rack unit is a measure of vertical spacing and is common to both the 19 and 23-inch racks. Hole spacing is either on 1-inch (25 mm) centers (Western Electric standard), or the same as for 19-inch (482.6 mm) racks (0.625 in or 15.9 mm spacing).

  5. Siren disk - Wikipedia

    en.wikipedia.org/wiki/Siren_disk

    Siren disk hole spacing. The harmonic portion of the siren disk Most siren disks include multiple concentric circles of spaced holes, so that an air-jet can be ...

  6. Circle packing - Wikipedia

    en.wikipedia.org/wiki/Circle_packing

    The spacing between the points determines the noise tolerance of the transmission, while the circumscribing circle diameter determines the transmitter power required. Performance is maximized when the constellation of code points are at the centres of an efficient circle packing. In practice, suboptimal rectangular packings are often used to ...

  7. Close-packing of equal spheres - Wikipedia

    en.wikipedia.org/wiki/Close-packing_of_equal_spheres

    In geometry, close-packing of equal spheres is a dense arrangement of congruent spheres in an infinite, regular arrangement (or lattice). Carl Friedrich Gauss proved that the highest average density – that is, the greatest fraction of space occupied by spheres – that can be achieved by a lattice packing is

  8. Engineering drawing abbreviations and symbols - Wikipedia

    en.wikipedia.org/wiki/Engineering_drawing...

    equal, equally, equally spaced: For example, "⌀10 4X EQL SPACED ON BC" means "drill four holes of 10mm diameter equally spaced around the bolt circle." "6-⌀6.8 EQS PCD 50" means "drill 6 holes of 6.8mm diameter equally spaced on the Pitch Circle Diameter ⌀50." ERC: electrical rule check EXIST. existing

  9. Bearing pressure - Wikipedia

    en.wikipedia.org/wiki/Bearing_pressure

    d 0: diameter of the passthrough hole; α = min{e 1 /3d 0 ; p 1 /3d 0 - 1/4 ; f ub /f u ; 1}, with e 1: end distance from the center of a fastener hole to the adjacent end of the part, measured in the direction of load transfer, p 1: spacing between centers of fasteners in the direction of load transfer, f ub: specified ultimate tensile ...