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  2. Palladium - Wikipedia

    en.wikipedia.org/wiki/Palladium

    Palladium is also used in electronics, dentistry, medicine, hydrogen purification, chemical applications, groundwater treatment, and jewelry. Palladium is a key component of fuel cells, in which hydrogen and oxygen react to produce electricity, heat, and water. Ore deposits of palladium and other PGMs are rare.

  3. Isotopes of palladium - Wikipedia

    en.wikipedia.org/wiki/Isotopes_of_palladium

    view. talk. edit. Natural palladium (46 Pd) is composed of six stable isotopes, 102 Pd, 104 Pd, 105 Pd, 106 Pd, 108 Pd, and 110 Pd, although 102 Pd and 110 Pd are theoretically unstable. The most stable radioisotopes are 107 Pd with a half-life of 6.5 million years, 103 Pd with a half-life of 17 days, and 100 Pd with a half-life of 3.63 days.

  4. Space Shuttle thermal protection system - Wikipedia

    en.wikipedia.org/wiki/Space_Shuttle_thermal...

    Space Shuttle Discovery as it approaches the International Space Station during the STS-114 on 28 July 2005. The Space Shuttle thermal protection system (TPS) is the barrier that protected the Space Shuttle Orbiter during the searing 1,650 °C (3,000 °F) heat of atmospheric reentry.

  5. Einstein problem - Wikipedia

    en.wikipedia.org/wiki/Einstein_problem

    Aperiodic tiling with "Tile(1,1)". The tiles are colored according to their rotational orientation modulo 60 degrees. [1] ( Smith, Myers, Kaplan, and Goodman-Strauss) In plane geometry, the einstein problem asks about the existence of a single prototile that by itself forms an aperiodic set of prototiles; that is, a shape that can tessellate space but only in a nonperiodic way.

  6. Quartzite - Wikipedia

    en.wikipedia.org/wiki/Quartzite

    Quartzite is a very hard rock composed predominantly of an interlocking mosaic of quartz crystals. The grainy, sandpaper-like surface is glassy in appearance. Minor amounts of former cementing materials, iron oxide, silica, carbonate and clay, often migrate during recrystallization, causing streaks and lenses to form within the quartzite. [1 ...

  7. Quarry tile - Wikipedia

    en.wikipedia.org/wiki/Quarry_tile

    Quarry tile is a building material, usually to inch (13 to 19 mm) thick, made by either the extrusion process or more commonly by press forming and firing natural clay or shales. [1][2] Quarry tile is manufactured from clay in a manner similar to bricks. [3] It is shaped from clay, and fired at a high temperature, about 2,000 °F (1,000 °C).

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