Two types of TiO 2 nano-tubular arrays were obtained by anodization of a titanium foil, in two different solutions containing fluoride ions. For the first type which has rough tube walls, impedance measurements in the dark showed the presence of a localised surface state which was related to adsorbed molecular water. Under UV illumination this adsorbed molecular water was photo-dissociated. Mor...

We present a reduced model for the transition to turbulence in shear flow that is simple enough to admit a thorough numerical investigation while allowing spatiotemporal dynamics that are substantially more complex than those allowed in previous modal truncations. Our model allows a comparison of the dynamics resulting from initial perturbations that are localised in the spanwise direction with...

The polaron concept, first introduced by Landau [1], is one of the main pillars on which the theoretical analysis of materials with strong electron-phonon (EP) coupling rests. In these compounds, the coupling between the electron and the lattice leads to a lattice deformation whose potential tends to bind the electron to the deformed region of the crystal. This process, which has been called se...

We present an implementation of time-dependent density-functional theory (TDDFT) in the linear response formalism enabling the calculation of low energy optical absorption spectra for large molecules and nanostructures. The method avoids any explicit reference to canonical representations of either occupied or virtual Kohn-Sham states and thus achieves linear-scaling computational effort with s...

Localised amyloidosis of the larynx is uncommon and poorly understood. The precise etiology and pathogenesis are not entirely clear. It usually presents with hoarseness, pain and/or difficulty in breathing. We present the case of a 42-year-old woman with primary localised laryngeal amyloidosis who presented with hoarseness and dyspnoea. Biopsy of the specimen revealed amyloid.There were no sign...