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  2. Lamb shift - Wikipedia

    en.wikipedia.org/wiki/Lamb_shift

    In physics, the Lamb shift, named after Willis Lamb, is an anomalous difference in energy between two electron orbitals in a hydrogen atom. The difference was not predicted by theory and it cannot be derived from the Dirac equation , which predicts identical energies.

  3. Willis Lamb - Wikipedia

    en.wikipedia.org/wiki/Willis_Lamb

    Willis Eugene Lamb Jr. (/ l æ m /; July 12, 1913 – May 15, 2008) was an American physicist who won the Nobel Prize in Physics in 1955 "for his discoveries concerning the fine structure of the hydrogen spectrum."

  4. Shift plan - Wikipedia

    en.wikipedia.org/wiki/Shift_plan

    There are 28 shifts per employee in a six-week cycle (i.e. 42 days), this adds up to an average of 56 hours worked per week with 12-hour shifts, or 37 + 1 ⁄ 3 hours per week with 8-hour shifts. Three groups are needed for each time span, i.e. to cover the whole day and week a company needs 6 groups for 12-hour shifts or 9 groups for 8-hour ...

  5. Why do we work 9 to 5? The history of the eight-hour workday

    www.aol.com/why-9-5-history-eight-105902493.html

    Hunnicutt’s book, “Kellogg’s Six-Hour Day,” tells the story of how cereal baron W.K. Kellogg decided in 1930 to institute six-hour shifts in place of eight-hour shifts, with some reduction ...

  6. Schedule (workplace) - Wikipedia

    en.wikipedia.org/wiki/Schedule_(workplace)

    A weekly or monthly schedule is usually ordered alphabetically, employees being listed on the left hand side of a grid, with the days of the week on the top of the grid. [citation needed] In shift work, a schedule usually employs a recurring shift plan. A schedule is most often created by a manager.

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  9. Shift work - Wikipedia

    en.wikipedia.org/wiki/Shift_work

    A 3:1 ratio of work days to days off is most effective for eight-hour shifts, and a 2:2 ratio of work days to days off is most effective for twelve-hour shifts. [49] [50] Eight-hour shifts and twelve-hour shifts are common in manufacturing and health care. Twelve-hour shifts are also used with a very slow rotation in the petroleum industry ...

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