In this paper the positive and strictly contractive extension problems for almost periodic matrix functions are treated. We present necessary and sufficient conditions for the existence of extensions ...

Abstract. The periodic matrix equations are strongly related to analysis of periodic control systems for various engineering and mechanical problems. In this work, a matrix form of the conjugate ...

The charge-carrier density—or equivalently, the Fermi energy—strongly controls phase transitions in correlated systems. Traditionally, charge-carrier density can be controlled by doping, that is, by ...