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Many wind turbine gearboxes require repair or replacement well before reaching the end of their design life. The most common failure is bearing axial cracks, commonly called white etching cracks (WECs), which typically occur in the inner raceways of the high‐speed parallel‐stage rolling element bearings. Although the root causes of WECs are debated, one theory is that they are related to routine dynamic...
Introduction
The objective of this study was to develop a rating scale to assess the severity of Guillain‐Barré syndrome (GBS).
Methods
The preliminary rating scale, which contained 11 items, was developed by the Delphi method, and data of 258 patients were collected to evaluate it. Item analysis was accomplished by 100 patients; the additional 158 patients were used to evaluate the reliability,...
To date, gate stacks for high mobility semiconductors like Ge and InGaAs have been generally designed to minimise their interfacial trap density, and thus include an Al oxide layer diffusion barrier as a component. However, this is now known to lead to reduced reliability. The source of the problem is discussed and possible solutions based on an AlN or AlON layer component are suggested instead. First,...
Hydrostatic stress of Cu damascene interconnects was calculated by using finite element method in the present work. The analytical work was performed to examine the distribution of hydrostatic stress and the effect of different line width in the Cu interconnects. Then a model of atomic diffusion was presented and used to calculate the size of stress-induced voiding according to result of hydrostatic...
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