This article derives necessary and sufficient conditions for robust stability of a feedback interconnection of linear time-invariant (LTI) systems that exhibit positive realness on finite nonzero ...

Three have been fitted with electric harps—frames strung with alternating positive and negative wires. Bees, which only touch one wire, pass safely through, but hornets attempting to breach the ...

Three have been fitted with electric harps – frames strung with alternating positive and negative wires. Bees, which only touch one wire, pass safely through, but hornets attempting to breach ...