PROJECT: STEEL BUILDING DESIGN CASE STUDY. SUBJECT: JOIST SELECTION (ECONOMICAL BAY STUDY) Investigate two framing options: Option I - joists span 30', Option II - joists span 36'. This bay framing study is done for joists (sheets 16-17), interior floor girders (sheets 18-22), and. interior fill beams (sheet 23-24). Comparison bays are priced out (sheet 25) to select economical bay framing.
This discovery of spontaneous âradioactivityâ (a term coined by Becquerelâs doctoral student, Marie Curie) eventually earned Becquerel a Nobel Prize for Physics in 1903, which he shared with Marie Curie and her husband Pierre Curie.enchmarks: Henri Becquerel discovers radioactivity on February 26, 1896. Credit: A photographic plate made by Henri Becquerel shows the effects of exposure to radioactivity. A metal Maltese cross, placed between the plate and radioactive uranium salt, left a clearly visible shadow on the plate.
In 1899 Ernest Rutherford studied the absorption of radioactivity by thin sheets of metal foil and found two components: alpha (a) radiation, which is absorbed by a few thousandths of a centimeter of metal foil, and beta (b) radiation, which can pass through 100 times as much foil before it was absorbed.