In collaboration with Gladden in the Department of Chemical Engineering, Alexander has applied and developed various data analysis and image processing techniques which were originally written for application in Radio Astronomy and applied them to problems in Magnetic Resonance studies of porous media. Specifically, they have developed techniques to characterise structural inhomogeneities in materials (Gladden, Alexander & Hollewand 1995), the void-space of a porous network (Baldwin et al. 1996), as well as flow and diffusion through these systems (Sederman et al. 1997, Sousa Goncalves et al. 1995, Gladden & Alexander 1996). Data analysis developments in this area have led to a new X-window interface for the popular gnuplot program (Alexander & Gladden 1995) and a new Magnetic Resonance technique for imaging different chemical species (Baldwin et al. 1995).