IoM3 — Young Persons Lecture Competition — 2008
Wednesday, February 13th, 2008 at 19:30
Investigation of Lime Mortar/Tesserae Adhesion in Medieval Mosaics from the Basilica di San Marco — Diana Edwards, University of Bristol
The chemical structure of medieval mortar from the Basilica di San Marco has been investigated using Gallium Ion Beam Sectioning, Ion-stimulated Secondary Electron Imaging, Energy Dispersive X-ray Spectroscopy, X-ray Diffraction and Micro-raman Spectroscopy. Two distinct phases were identified, an inorganic phase, possibly calcium carbonate and an unidentified organic phase. In addition, the adhesion of tesserae has been studied by placing trial glass sections on a 1:3 pure calcium lime/sand mortar mix and tested using a specially designed shear strength testing rig. This test was repeated with other mortar mixes prepared with lime containing magnesium from the University of Venice. Preliminary indications are that adhesion at the glass/lime interface is much higher in limes containing magnesium. Further tests are intended to determine whether the addition of various organic materials will improve adhesion and more closely simulate the content of the original medieval mortars.
Materials Selection for a Fuel Efficient Aircraft Fuselage Design — Ben Jones, University of the West of England
Over the years there have been many drivers for technological advancement, but in today the biggest driver is climate change. The aim of a great deal of present research is the reduction of harmful greenhouse gases in everything from the home to power stations. To this aim, a MEng project looks to develop an advanced fuselage design for single and twin aisle airliners using a novel fuselage shape coupled with aerodynamic flow control to give increased efficiency. Given the radical change in shape and function of the fuselage in this new design, it is necessary to review the choice of material used in its construction. This presentation looks at the requirements the material must fulfil and then proposes a material selection from these requirements. The picture is the rear fuselage barrel of the Boeing 787 Dreamliner which is made almost entirely of carbon fibre composite, a first for an aircraft of this type.