Affiliation: | aDepartment of Mathematics, University of Strathclyde, Livingstone Tower, 26 Richmond Street, Glasgow G1 1XH, UK bThe Centre for Ultrasonic Engineering, Department of Electronic and Electrical Engineering, University of Strathclyde, Glasgow G1 1XW, UK cDepartment of Pure and Applied Chemistry, University of Strathclyde, Glasgow G1 1XL, UK |