Abstract: A method of calcining a clay material for use as a supplementary cementitious material, includes providing a raw clay material, optionally drying the raw clay material, granulating the raw clay material in order to obtain raw clay granules, calcining the raw clay granules to obtain calcined clay granules, and grinding the calcined clay granules to obtain a pulverulent supplementary cementitious material.

Abstract: An active anti-fog eyewear system includes a lens with a conductive layer and a power source to provide an electrical current to the conductive layer. When the current is provided to the conductive layer, the conductive layer generates heat. A portion of the conductive layer that is positioned in front of the eyes of a wearer of the eyewear, and a corresponding portion of the lens, is heated more rapidly than other portions of the conductive layer and lens. Condensed water vapor is rapidly cleared from the portion of lens that is positioned in front of the wearer’s eyes. The lens can include electrodes positioned near the top of the lens to direct the current to the portion of the conductive layer that is positioned within a line of sight of the wearer.