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  2. 1951 USAF resolution test chart - Wikipedia

    en.wikipedia.org/.../1951_USAF_resolution_test_chart

    A 1951 USAF resolution test chart is a microscopic optical resolution test device originally defined by the U.S. Air Force MIL-STD-150A standard of 1951. The design provides numerous small target shapes exhibiting a stepped assortment of precise spatial frequency specimens.

  3. Plasma cutting - Wikipedia

    en.wikipedia.org/wiki/Plasma_cutting

    Hand-held torches can usually cut up to 38 mm (1.5 in) thick steel plate, and stronger computer-controlled torches can cut steel up to 150 mm (6 in) thick. [citation needed] Since plasma cutters produce a very hot and very localized "cone" to cut with, they are extremely useful for cutting sheet metal in curved or angled shapes.

  4. Plasma torch - Wikipedia

    en.wikipedia.org/wiki/Plasma_torch

    Thermal plasmas are generated in plasma torches by direct current (DC), alternating current (AC), radio-frequency (RF) and other discharges. DC torches are the most commonly used and researched, because when compared to AC: "there is less flicker generation and noise, a more stable operation, better control, a minimum of two electrodes, lower electrode consumption, slightly lower refractory ...

  5. Landolt C - Wikipedia

    en.wikipedia.org/wiki/Landolt_C

    Landolt C optotypes in various sizes and orientations Landolt C optotype dimensions Golovin–Sivtsev table. The Landolt C, also known as a Landolt ring, Landolt broken ring, or Japanese vision test, is an optotype: a standardized symbol used for testing vision.

  6. What is a normal blood pressure reading? - AOL

    www.aol.com/lifestyle/normal-blood-pressure...

    When Dr. Oz sat Rachael Ray down for a blood pressure test during a segment of her show, he wasn't entirely pleased with the numbers he saw. In fact, he made her do it again -- and he called her ...

  7. Smith chart - Wikipedia

    en.wikipedia.org/wiki/Smith_chart

    Using the Smith chart, the normalised impedance may be obtained with appreciable accuracy by plotting the point representing the reflection coefficient treating the Smith chart as a polar diagram and then reading its value directly using the characteristic Smith chart scaling. This technique is a graphical alternative to substituting the values ...

  8. Material selection - Wikipedia

    en.wikipedia.org/wiki/Material_selection

    Free variables are quantities that can change during the loading cycle, for example, applied force. Design variables are limits imposed on the design, such as how thick the beam can be or how much it can deflect; Next, an equation for the performance index is derived. This equation numerically quantifies how desirable the material will be for a ...

  9. Control chart - Wikipedia

    en.wikipedia.org/wiki/Control_chart

    Control charts are graphical plots used in production control to determine whether quality and manufacturing processes are being controlled under stable conditions. (ISO 7870-1) [1] The hourly status is arranged on the graph, and the occurrence of abnormalities is judged based on the presence of data that differs from the conventional trend or deviates from the control limit line.

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