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  2. Ring binder - Wikipedia

    en.wikipedia.org/wiki/Ring_binder

    A ring binder, folded. Ring binders (loose leaf binders, looseleaf binders, or sometimes called files in Britain) are large folders that contain file folders or hole punched papers (called loose leaves). These binders come in various sizes and can accommodate an array of paper sizes. These are held in the binder by circular or D-shaped ...

  3. Polyrotaxane - Wikipedia

    en.wikipedia.org/wiki/Polyrotaxane

    Polyrotaxane. Polyrotaxane is a type of mechanically interlocked molecule consisting of strings and rings, in which multiple rings are threaded onto a molecular axle and prevented from dethreading by two bulky end groups. As oligomeric or polymeric species of rotaxanes, polyrotaxanes are also capable of converting energy input to molecular ...

  4. Big Ring - Wikipedia

    en.wikipedia.org/wiki/Big_Ring

    Big Ring. The Big Ring is a ring-shaped large-scale structure formed by galaxies and galaxy clusters near the constellation Boötes with a diameter of 1.3 billion light years, located 9.2 billion light years away. [1] It was discovered in 2024 by Alexia Lopez, a PhD student at the University of Central Lancashire. [2]

  5. Selected area diffraction - Wikipedia

    en.wikipedia.org/wiki/Selected_area_diffraction

    Selected area (electron) diffraction (abbreviated as SAD or SAED) is a crystallographic experimental technique typically performed using a transmission electron microscope (TEM). It is a specific case of electron diffraction used primarily in material science and solid state physics as one of the most common experimental techniques.

  6. Ring expansion and contraction - Wikipedia

    en.wikipedia.org/wiki/Ring_expansion_and_contraction

    The Dowd-Beckwith ring expansion reaction is also capable of adding several carbons to a ring at a time, and is a useful tool for making large rings. [11] While it proceeds through an intermediate bicycle the final cyclization and ring opening take place within the same radical reaction. [12]

  7. Retort stand - Wikipedia

    en.wikipedia.org/wiki/Retort_stand

    In chemistry, a retort stand, also called a clamp stand, [1] a ring stand, [2] or a support stand, [3] is a piece of scientific equipment intended to support other pieces of equipment and glassware — for instance, burettes, test tubes and flasks. [4] The typical ring stand consists of a heavy base and a vertical rod, both usually made of metal.

  8. Spherical roller bearing - Wikipedia

    en.wikipedia.org/wiki/Spherical_roller_bearing

    A spherical roller bearing is a rolling-element bearing that permits rotation with low friction, and permits angular misalignment. Typically these bearings support a rotating shaft in the bore of the inner ring that may be misaligned in respect to the outer ring. The misalignment is possible due to the spherical internal shape of the outer ring ...

  9. Rings of Saturn - Wikipedia

    en.wikipedia.org/wiki/Rings_of_Saturn

    Rings of Saturn. The full set of rings, imaged as Saturn eclipsed the Sun from the vantage of the Cassini orbiter, 1.2 million km (¾ million miles) distant, on 19 July 2013 (brightness is exaggerated). Earth appears as a dot at 4 o'clock, between the G and E rings. The rings of Saturn are the most extensive and complex ring system of any ...