Skis and methods of skiing are provided. The power control may be operated in a first mode of operation wherein power control data are determined in response to a quality parameter, such as a desired signal to noise ratio. Moreover, the described subject matter also provides for inserting new threads into the multi-dimensional sleep queue in a manner that allows other processes to execute during the thread insertion process. The optical film includes a silicon oxide compound with fluorine element, the conductive material mixed therein, and a plurality of three-dimensional mesoporous. The boundaries of the tool are initially loose to ensure that the tool is contained within the boundaries. Each optical component is configured to focus light on a light-sensing portion of one of the pixels.