Heterostructure engineering capability, especially in the radial direction, is a unique property of bottom-up nanowires (NWs) that makes them a serious candidate for high-performance field-effect transistors (FETs). In this Letter, we present a comprehensive study on size dependent carrier transport behaviors in vapor-liquid-solid grown Ge/Si core/shell NWFETs. Transconductance, subthreshold sw...

We report on ensemble Monte Carlo hole transport simulations for small diameter silicon nanowires. The basis for the simulations is provided by band structure calculations using sp3d5s tight-binding scheme. Principal scattering mechanisms considered are hole-bulk acoustic and optical phonon interactions. Both steady-state and transient hole transport characteristics are explored. For the silico...

BACKGROUND/AIMS Closure is more difficult to achieve in macular holes that remain open following a previous unsuccessful pars plana vitrectomy (PPV). We present our results with the internal limiting membrane (ILM) translocation technique that is used to optimise outcomes in refractory macular holes. METHODS A prospective, interventional, case series was conducted. 12 eyes of 12 consecutive p...

PURPOSE To examine anatomical changes in idiopathic macular holes during surgery using handheld spectral-domain optical coherence tomography (SD-OCT). METHODS Five eyes of 5 patients who underwent surgery for the repair of idiopathic macular holes were examined. The surgery included standard 25-gauge, 3-port pars plana vitrectomy, removal of the internal limiting membrane (ILM), fluid-air exc...

This thesis presents a study of the effect of controllable riveting parameters, mainly squeeze force, rivet length, rivet diameter tolerance, hole countersunk depth and hole diameter tolerance, on the quality of formed rivet. The quality of a formed rivet is determined by the geometry of its head formation and the extent to which the hole is filled. The study determines maximum allowable tolera...

Introduction: Treatment efficacy of radiation therapy using Yttrium-90 radionuclide is evaluated by the bremsstrahlung SPECT imaging following radiation therapy. The radioisotopic images have the ability to provide reliable activity map of 90Y distribution. But these images have a low quantitative accuracy in the 90Y bremsstrahlung SPECT imaging, therefore the optimization of...

GaAs nanowires are grown by molecular beam epitaxy using a self-catalyzed, Ga-assisted growth technique. Position control is achieved by nano-patterning a SiO(2) layer with arrays of holes with a hole diameter of 85 nm and a hole pitch varying between 200 nm and 2 µm. Gallium droplets form preferentially at the etched holes acting as catalyst for the nanowire growth. The nanowires have hexagona...

Abstract: Based on a recent formulation of the V –parameter of a photonic crystal fiber we provide numerically based empirical expressions for this quantity only dependent on the two structural parameters — the air hole diameter and the hole-to-hole center spacing. Based on the unique relation between the V –parameter and the equivalent mode field radius we identify how the parameter space for ...