Athenian cultural dominance continued throughout the Roman period, and the buildings added to the Agora reflect the educational role of the city, a role that ended only with the closing of the pagan philosophical schools by the Christian emperor Justinian in A.D. 529.
Bearing, in machine construction, a connector (usually a support) that permits the connected members to rotate or to move in a straight line relative to one another. Often one of the members is fixed, and the bearing acts as a support for the moving member. Most bearings support rotating shafts against either transverse (radial) or thrust (axial) loads.
To compute bearing loads, the forces which act on the. shaft being supported by the bearing must be. determined. Loads which act on the shaft and its related. parts include dead load of the rotator, load produced. when the machine performs work, and load produced by. transmission of dynamic force. These can theoretically. be mathematically calculated, but calculation is difficult in.