Abstract: The present disclosure generally relates to methods for tracking the performance of a physical activity event. In some embodiments, the method is performed at a computer system that is in communication with one or more perceptual output generation components and one or more sensors and includes detecting a start of a physical activity, providing ongoing feedback relating to a target duration, and if the activity continues for at least the duration, indicating that the activity continued for at least the target duration.

Abstract: A silicon substrate having a controlled oxygen content is sliced to form a wafer. The backside surface of the wafer is mechanically damaged for external gettering, polished, and subjected to heat for annealing to reduce strain and defects near the surface. The surface is then etched and the epitaxial layer formed by first growing an epitaxial layer, removing a substantial portion thereof, and then regrowing the layer to the required thickness. Immediately prior to device processing, an oxide layer is formed by heating the wafer, removing a portion of the epitaxial layer, and placing the wafer in an oxygen atmosphere. After a preselected time period in the oxygen atmosphere, the temperature is gradually reduced.