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  2. Arago's rotations - Wikipedia

    en.wikipedia.org/wiki/Arago's_rotations

    Arago's rotations is an observable magnetic phenomenon that involves the interactions between a magnetized needle and a moving metal disk. The effect was discovered by François Arago in 1824. At the time of their discovery, Arago's rotations were surprising effects that were difficult to explain.

  3. Hard disk drive platter - Wikipedia

    en.wikipedia.org/wiki/Hard_disk_drive_platter

    A typical magnetic region on a hard-disk platter (as of 2006) is about 200–250 nanometers wide (in the radial direction of the platter) and extends about 25–30 nanometers in the down-track direction (the circumferential direction on the platter), [citation needed] corresponding to about 100 billion bits per square inch of disk area (15.5 ...

  4. Zone plate - Wikipedia

    en.wikipedia.org/wiki/Zone_plate

    The zone plate's focusing ability is an extension of the Arago spot phenomenon caused by diffraction from an opaque disc. [2] A zone plate consists of a set of concentric rings, known as Fresnel zones, which alternate between being opaque and transparent. Light hitting the zone plate will diffract around the opaque zones.

  5. Ex-Abercrombie & Fitch CEO has dementia, lawyers say - AOL

    www.aol.com/ex-abercrombie-fitch-ceo-dementia...

    The former CEO of Abercrombie & Fitch (A&F) has dementia and late onset Alzheimer's disease, his legal team has said in a court document filed in New York. Lawyers for Mike Jeffries have requested ...

  6. Perpendicular recording - Wikipedia

    en.wikipedia.org/wiki/Perpendicular_recording

    Perpendicular recording (or perpendicular magnetic recording, PMR), also known as conventional magnetic recording (CMR), is a technology for data recording on magnetic media, particularly hard disks. It was first proven advantageous in 1976 by Shun-ichi Iwasaki , then professor of the Tohoku University in Japan, and first commercially ...

  7. Meghan Markle Shares the Christmas Tradition She Cherishes ...

    www.aol.com/meghan-markle-shares-christmas...

    Meghan Markle and Prince Harry are ushering in Christmas with a beloved tradition.. Last month, the Duchess of Sussex opened up about her love for the holiday season and the memories she looks ...

  8. Is Vikings-Lions finale the greatest matchup in NFL regular ...

    www.aol.com/sports/vikings-lions-finale-greatest...

    The NFL couldn't have had any idea when it scheduled Vikings at Lions in Week 18 that it would be flexed to Sunday night, much less be in the conversation as the greatest regular-season matchup in ...

  9. Torsion spring - Wikipedia

    en.wikipedia.org/wiki/Torsion_spring

    A coil of wire attached to the pointer twists in a magnetic field against the resistance of a torsion spring. Hooke's law ensures that the angle of the pointer is proportional to the current. A DMD or digital micromirror device chip is at the heart of many video projectors. It uses hundreds of thousands of tiny mirrors on tiny torsion springs ...

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