A cooling configuration is provided for chassis-mounted electronics boards. Accordingly, the invention features compositions that include a copolymer and a filler such as calcium carbonate ). A method of eye tracking using the display apparatus includes steps of displaying an image; generating position information on a user positioned relative to the displayed image; and tracking a gaze of the user upon the displayed image, based on the position information. The next gear state is based on the current gear state and the one of the upshift and downshift. Also provided are a defective region compensation method of a semiconductor layer, a photovoltaic element, and a method of producing the photovoltaic element.