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  2. Coupon (PWB) - Wikipedia

    en.wikipedia.org/wiki/Coupon_(PWB)

    Coupon (PWB) A coupon or test coupon is a printed circuit board (PCB) used to test the quality of a printed wiring board (PWB) fabrication process. Test coupons are fabricated on the same panel as the PWBs, typically at the edges. Coupons are then inspected to ensure proper layer alignment, electrical connectivity, and cross sectioned to ...

  3. Three-point flexural test - Wikipedia

    en.wikipedia.org/wiki/Three-point_flexural_test

    The three-point bending flexural test provides values for the modulus of elasticity in bending, flexural stress, flexural strain and the flexural stress–strain response of the material. This test is performed on a universal testing machine (tensile testing machine or tensile tester) with a three-point or four-point bend fixture.

  4. Production part approval process - Wikipedia

    en.wikipedia.org/wiki/Production_part_approval...

    PPAP is a series of documents gathered in one specific location (a binder or electronically) called the "PPAP Package". The PPAP package is a series of documents which need a formal certification / sign-off by the supplier and approval / sign-off by the customer. The form that summarizes this package is called PSW (Part Submission Warrant).

  5. Fluorescent penetrant inspection - Wikipedia

    en.wikipedia.org/wiki/Fluorescent_penetrant...

    Fluorescent penetrant inspection (FPI) is a type of dye penetrant inspection in which a fluorescent dye is applied to the surface of a non-porous material in order to detect defects that may compromise the integrity or quality of the part in question. FPI is noted for its low cost and simple process, and is used widely in a variety of industries.

  6. Three-point estimation - Wikipedia

    en.wikipedia.org/wiki/Three-point_estimation

    The three-point estimation technique is used in management and information systems applications for the construction of an approximate probability distribution representing the outcome of future events, based on very limited information. While the distribution used for the approximation might be a normal distribution, this is not always so.

  7. Why Is Puberty Starting Earlier? New Research Points To ... - AOL

    www.aol.com/why-puberty-starting-earlier-earlier...

    There has been a trend for years of children reaching puberty at earlier ages, and the reason why has largely mystified doctors. Now, new research is suggesting a possible culprit—and it shows ...

  8. Van der Pauw method - Wikipedia

    en.wikipedia.org/wiki/Van_der_Pauw_method

    The van der Pauw Method is a technique commonly used to measure the resistivity and the Hall coefficient of a sample. Its strength lies in its ability to accurately measure the properties of a sample of any arbitrary shape, as long as the sample is approximately two-dimensional (i.e. it is much thinner than it is wide), solid (no holes), and the electrodes are placed on its perimeter.

  9. Congresswomen press FDA on why a proposal to ban hair ...

    www.aol.com/lifestyle/congresswomen-press-fda...

    Two U.S. House members who first pushed the Food and Drug Administration in 2023 to investigate the health risks of hair straighteners used primarily by Black women are now asking the agency why ...

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