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  2. Filter factor - Wikipedia

    en.wikipedia.org/wiki/Filter_factor

    Most calculators do not have a function. An equivalent calculation is: ... 3400 K to 5500 K: 80B: KB12: 3 3800 K to 5500 K: 80C: KB6: 2 Warming filters

  3. PD 5500 - Wikipedia

    en.wikipedia.org/wiki/PD_5500

    PD 5500 is a specification for unfired pressure vessels. It specifies requirements for the design, manufacture, inspection and testing of unfired pressure vessels made from carbon, ferritic alloy, and austenitic steels. It also includes material supplements containing requirements for vessels made from aluminium, copper, nickel, titanium and ...

  4. Maximum acceptable toxicant concentration - Wikipedia

    en.wikipedia.org/wiki/Maximum_Acceptable...

    The maximum acceptable toxicant concentration (MATC) is a value that is calculated through aquatic toxicity tests to help set water quality regulations for the protection of aquatic life.

  5. Local average treatment effect - Wikipedia

    en.wikipedia.org/wiki/Local_average_treatment_effect

    The LATE can be estimated by a ratio of the estimated intent-to-treat effect and the estimated proportion of compliers, or alternatively through an instrumental variable estimator. The LATE was first introduced in the econometrics literature by Guido W. Imbens and Joshua D. Angrist in 1994, who shared one half of the 2021 Nobel Memorial Prize ...

  6. FEV1/FVC ratio - Wikipedia

    en.wikipedia.org/wiki/FEV1/FVC_ratio

    In obstructive lung disease, the FEV1 is reduced due to an obstruction of air escaping from the lungs. Thus, the FEV1/FVC ratio will be reduced. [4] More specifically, according to the National Institute for Clinical Excellence, the diagnosis of COPD is made when the FEV 1 /FVC ratio is less than 0.7 or [8] the FEV 1 is less than 75% of predicted; [9] however, other authoritative bodies have ...

  7. Butterworth filter - Wikipedia

    en.wikipedia.org/wiki/Butterworth_filter

    The frequency response plot from Butterworth's 1930 paper. [1]The Butterworth filter is a type of signal processing filter designed to have a frequency response that is as flat as possible in the passband.

  8. Crack growth equation - Wikipedia

    en.wikipedia.org/wiki/Crack_growth_equation

    Figure 1 shows a typical plot of the rate of crack growth as a function of the alternating stress intensity or crack tip driving force plotted on log scales. The crack growth rate behaviour with respect to the alternating stress intensity can be explained in different regimes (see, figure 1) as follows

  9. Fracture toughness - Wikipedia

    en.wikipedia.org/wiki/Fracture_toughness

    The other method, namely the secant method, uses the compliance-crack length equation given by ASTM standard to calculate effective crack length from an effective compliance. Compliance at any point in Load vs displacement curve is essentially the reciprocal of the slope of the curve that ensues if the specimen is unloaded at that point.