Water in opal – what can it tell us?

Opal is a hydrous silica composed of predominantly silicon dioxide and water. The chemical composition of opal is normally described by the general formula SiO2.nH2O. The formula indicates that opal contains water and the value of ‘n’ is variable so the water content is variable and is known to range widely. Such a simple formula hides much of the important characteristics of how water is contained in opal and the variability in the water content and states of water is intricately involved in the formation of opal and may influence properties of the opal as a gemstone. The understanding of the states of water in opal is therefore of importance. The way in which the water is contained provides clues to the mechanisms of formation of opal. The water contained may also be used as a probe to help elucidate the complex microstructure beyond the sphere array structure in which precious opal, in particular, is described. This article will outline the types of water present in opal that displays play-of colour (POC) and how these types have been determined using chemical and physical laboratory characterisation techniques

Design principles of a bacterial signalling network

Design principles of a bacterial signalling networ

MAMI: A Modular Accessible Musical Instrument

Exploring musicactively can be restricted for someone with cognitive, physical, or sensory impairments. They may face barriers to participation and diminished experiences between their musical expression and the music making means available to them. Technology can be used to bridge these gaps and focus on a person’s capability to create personal instruments that allow for active music making and exploration of sound. Thisdoctoral research aims to look at the use of music technology within the school setting and the needs of the users and those around them.Drawing on this and following an Action Research methodology, a tool will be developed following a participatory design process that utilises both hardware and software, in a modular fashion, to provide a flexible and adaptable system to facilitate music making and sound exploration.The desired outcome will be a toolbox that allows users to put together instruments that suit the needs of those playing them allowing access to musical expression