An impingement cooling system for cooling electronic components includes a nozzle array having a plurality of nozzles in fluid communication with a source of cooling fluid, each nozzle including a deflection structure that deforms above a threshold temperature. The method comprises two main steps. In a baseline usage, the sequential partial fingerprint sequence techniques augments sentinel systems for gaining access to restricted areas, and when used in combination with financial cards, offer a unique and greatly simplified means for authenticating or identifying individuals. The differential transmission line includes two straight regions and a curved region, interconnecting the two straight regions.