Member, Promotion and Tenure Committee, College of Engineering, 1998-present. Member, Academic Standards Committee , College of Engineering, 1997-2001. Member, Committee on Appeals, University Faculty Senate, 1999-present. President, Phi Beta Kappa , Zeta of Iowa Chapter, College of Liberal Arts and Sciences, 1998-99. Excellent detailed agreement between theory and measurements.
Application is to materials characterization.
Infiltration defects in prepreg graphite-epoxy composite have been detected and characterized. Excellent discrimination among high, medium, and low quality material has been demonstrated. Investigations on influence of transducer performance, focussing effects, and generation of leaky waves. Synthetic aperture methods used to characterize viscoelastic properties of composites in air-coupled transmission experiments. C-scans have also been carried out.