This study aimed to investigate the effects of sleep deprivation on postural control, subjective fatigue assessment and psychomotor performance, and to assess the efficiency of an objective posturographic test as an indicator of mental fatigue. Postural sway using static posturography (Romberg's test), subjective fatigue assessment (Stanford Sleepiness Scale) and psychomotor performance (Sternb...

OBJECTIVES This study compared the cyclic fatigue resistance of nickel-titanium (NiTi) files obtained in a conventional test using a simulated canal with a newly developed method that allows the application of constant fatigue load conditions. MATERIALS AND METHODS ProFile and K3 files of #25/.06, #30/.06, and #40/.04 were selected. Two types of testing devices were built to test their fatigu...

Bearing steel under severe loading condition undergoes substantial subsurface microstructural alterations known as Dark etching regions and white bands. White bands (WEBs) develop after hundreds of millions stress cycles in bearing components have been reported for several decades but the formation mechanism is not fully elucidated. Current research presents a systematic rolling contact fatigue...

Offshore wind turbines are subjected to cyclic loading conditions during their operational lifespan which is typically between 20 and 25 years. An important issue in fatigue design integrity assessment of offshore turbine foundations the examination long-term corrosion-fatigue behaviour steel structures high cycle region. High tests, particularly at low frequencies a seawater environment, time-...