Workday Habits and Fatigue of American Jockeys.

Objective: 1) Characterize the workday habits of American jockeys, and 2) Evaluate the relationship between workday habits and fatigue through changes in postural stability (balance) across their workday.

Methods: Thirty-seven jockeys participated in pre- and post-race day testing. Jockeys completed questionnaires on workday habits and a two-minute balance test with tri-axial accelerometers on the unstable surface and sacrum.

Characterization of spent nuclear fuel canister surface roughness using surface replicating molds.

In this study we present a replication method to determine surface roughness and to identify surface features when a sample cannot be directly analyzed by conventional techniques. As a demonstration, this method was applied to an unused spent nuclear fuel dry storage canister to determine variation across different surface features. In this study, an initial material down-selection was performed to determine the best molding agent and determined that non-modified Polytek PlatSil23-75 provided the most accurate representation of the surface while providing good usability.