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  2. Quantum tunnelling composite - Wikipedia

    en.wikipedia.org/wiki/Quantum_Tunnelling_Composite

    QTC pills can be used as input sensors which respond to an applied force. These pills can also be used in devices to control higher currents than QTC sheets. QTC sheets are composed of three layers: a thin layer of QTC material, a conductive material and a plastic insulator. QTC sheets allow a quick switch from high to low resistance and vice ...

  3. List of pearls by size - Wikipedia

    en.wikipedia.org/wiki/List_of_pearls_by_size

    The Pearl of Lao Tzu for a long time thought to be the largest pearl, but claims about its size and much of its history were found to be fabricated by a conman by the name of Victor Barbish. [2] Other pearls like the Centaur Pearl, most likely the largest gem pearl at 856.58 carats (171.316 g), have just recently emerged from private ...

  4. 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.

  5. QT interval - Wikipedia

    en.wikipedia.org/wiki/QT_interval

    An "abnormal" QTc in males is a QTc above 450 ms; and, in females, above 470 ms. [17] If there is not a very high or low heart rate, the upper limits of QT can roughly be estimated by taking QT = QTc at a heart rate of 60 beats per minute (bpm), and subtracting 0.02 s from QT for every 10 bpm increase in heart rate.

  6. Carat (mass) - Wikipedia

    en.wikipedia.org/wiki/Carat_(mass)

    Diamond-weighing kit, with weights labelled in grams and carats. The carat (ct) is a unit of mass equal to 200 mg (0.00705 oz; 0.00643 ozt), which is used for measuring gemstones and pearls.

  7. Giga Pearl - Wikipedia

    en.wikipedia.org/wiki/Giga_Pearl

    The Giga Pearl wrapped in the embrace of a 22k gold octopus. The Giga Pearl [1] holds the record as the largest certified non-nacreous pearl in the world. [2] The pearl weighs in at 27.65 kg (61.0 lb; 975 oz) and measures 39.37 cm × 22.86 cm × 20.95 cm (15.50 in × 9.00 in × 8.25 in), [3] which is four times larger than the Pearl of Lao Tzu (formerly the Pearl of Allah) which weighs 6.4 kg. [4]

  8. La Peregrina pearl - Wikipedia

    en.wikipedia.org/wiki/La_Peregrina_pearl

    The original weight of this pear-shaped pearl was 223.8 grains, (55.95 carats, 11.2 g, almost .4 oz.). At the time of its discovery, it was the largest pearl ever found. In 1913 the pearl had to be drilled and cleaned to secure it firmly to its setting. After drilling and cleaning, the pearl's weight decreased to 203.84 grains.

  9. Pteria penguin - Wikipedia

    en.wikipedia.org/wiki/Pteria_penguin

    Pteria penguin, commonly known as the penguin's wing oyster, is a species of marine bivalve mollusk in the family Pteriidae, the pearl oysters. It is native to the western and central Indo-Pacific region and is used for the production of cultured pearls. The generic name comes from Greek πτερον (pteron) meaning wing.