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  2. German tank problem - Wikipedia

    en.wikipedia.org/wiki/German_tank_problem

    The adversary is presumed to have manufactured a series of tanks marked with consecutive whole numbers, beginning with serial number 1. Additionally, regardless of a tank's date of manufacture, history of service, or the serial number it bears, the distribution over serial numbers becoming revealed to analysis is uniform, up to the point in time when the analysis is conducted.

  3. NACA duct - Wikipedia

    en.wikipedia.org/wiki/NACA_duct

    Prior submerged inlet experiments showed poor pressure recovery due to the slow-moving boundary layer entering the inlet. The NACA design is believed to work because the combination of the gentle ramp angle and the curvature profile of the walls creates counter-rotating vortices which deflect the boundary layer away from the inlet and draws in the faster moving air, while avoiding the form ...

  4. Atmospheric dispersion modeling - Wikipedia

    en.wikipedia.org/wiki/Atmospheric_dispersion...

    For most cases, the summation of the series with m = 1, m = 2 and m = 3 will provide an adequate solution. σ z {\displaystyle \sigma _{z}} and σ y {\displaystyle \sigma _{y}} are functions of the atmospheric stability class (i.e., a measure of the turbulence in the ambient atmosphere) and of the downwind distance to the receptor.

  5. BS EN 13121-3 - Wikipedia

    en.wikipedia.org/wiki/BS_EN_13121-3

    BS EN 13121-3 is European Standard adopted by UK, titled "GRP tanks and vessels for use above ground. Design and workmanship". [1] Design and workmanship is the final part within a four parts standard series which specifies the necessary requirements for design, fabrication, inspection and testing by manufacturers and specifiers within the area of chemical storage.

  6. Spline interpolation - Wikipedia

    en.wikipedia.org/wiki/Spline_interpolation

    The relations are n − 1 linear equations for the n + 1 values k 0, k 1, ..., k n. For the elastic rulers being the model for the spline interpolation, one has that to the left of the left-most "knot" and to the right of the right-most "knot" the ruler can move freely and will therefore take the form of a straight line with q′′ = 0 .

  7. Spirometry - Wikipedia

    en.wikipedia.org/wiki/Spirometry

    In addition, General anesthesia and various forms of sedation are not compatible with the testing process. Another limitation is that persons with intermittent or mild asthma can present normal spirometry values between acute exacerbation, reducing spirometry's effectiveness as a diagnostic tool in these circumstances.

  8. Table of congruences - Wikipedia

    en.wikipedia.org/wiki/Table_of_congruences

    Clement's congruence-based theorem characterizes the twin primes pairs of the form (, +) through the following conditions: [()! +] ((+)), +P. A. Clement's original 1949 paper [2] provides a proof of this interesting elementary number theoretic criteria for twin primality based on Wilson's theorem.

  9. Poincaré disk model - Wikipedia

    en.wikipedia.org/wiki/Poincaré_disk_model

    Poincaré disk with hyperbolic parallel lines Poincaré disk model of the truncated triheptagonal tiling.. In geometry, the Poincaré disk model, also called the conformal disk model, is a model of 2-dimensional hyperbolic geometry in which all points are inside the unit disk, and straight lines are either circular arcs contained within the disk that are orthogonal to the unit circle or ...