http://hdl.handle.net/10453/88 Sat, 18 May 2013 09:04:37 GMT 2013-05-18T09:04:37Z http://hdl.handle.net/10453/18426 On the Symbol Error Probability of Multihop Parallel Relay Networks Barua Bappi; Abolhasan Mehran; Safaei Farzad In this paper we analyze the symbol error probability (SEP) of a cooperative multihop parallel relay network in Rayleigh fading channels for M-ary Phase-shift keying (M-PSK) modulation. The general closed form expression of the SEP is derived. We present numerical results on the performance of the network. Sat, 01 Jan 2011 00:00:00 GMT http://hdl.handle.net/10453/18426 2011-01-01T00:00:00Z http://hdl.handle.net/10453/18427 Synthesis, characterisation and separation of photoreactive Hydrogen-titanate nanofibrous channel El Saliby Ibrahim; Shon Hokyong; Kandasamy Jaya; Kim Jong-Ho Australia is the world's largest wool producing country, accounting for about 25⿿30% of world production. As a biotemplate, we explored the possibility of using wool to produce micro-channel of Hydrogentitanate nanofibres through morphology transcription of wool microfibres. Hydrothermal method was adopted to synthesise titanate nanofibres. A facile method of impregnation followed by incineration at 600 ⿦C was utilised to prepare the nanofibrous channel. Anatase undoped nanofibrous (average nanofibre diameter = 44 nm) channel of around 50 min length and an average diameter of 9.5 mwere obtained. The photocatalytic activity of nanofibrous channel was monitored under UV irradiation for the decomposition of humic acid in aqueous solution using an aerobic batch reactor system. The photodegradation results showed that UV254 absorbing moeities and DOC were respectively reduced by 82% and 66% after 3 h of photoreaction at 1 g/L catalyst load. The novel nanofibrous channel could be easily separated from the aqueous suspension by sedimentation after the end of the photocatalytic reaction. Sat, 01 Jan 2011 00:00:00 GMT http://hdl.handle.net/10453/18427 2011-01-01T00:00:00Z http://hdl.handle.net/10453/18429 Thin films of AuCuAl shape memory alloy for use in plasmonic nano-actuators Cortie Michael We describe the fabrication and structure of nanoscale thin films of ? phase shape memory alloys with the nominal atomic stoichiometry Au 7Cu 5Al 4 (corresponding to 5.8 wt% Al). These alloys possess properties that suggest they could be used in nanoscale actuators. The films described here are between 20 and 50 nm thick which is below the thickness at which some other shape memory alloys cease to transform. However, microstructural and X-ray studies confirm that the coatings still exhibit the displacive transformations that are a prerequisite for the shape memory effect Sat, 01 Jan 2011 00:00:00 GMT http://hdl.handle.net/10453/18429 2011-01-01T00:00:00Z http://hdl.handle.net/10453/18428 Titanium-assisted growth of silica nanowires: from surface-matched to free-standing morphologies Callsen Gordon; Reparaz J S; Wagner M; Vierck A.; Phillips Matthew; Thomsen C; Hoffmann Axel We report on an oxide-assisted growth technique for silica nanowires which allows tuning the growth from surface-matched nanowires to free-standing morphologies based on growth control by Ti in the role of a catalyst and surfactant. Using an adjustable Ti concentration, we grew silica nanowires with lengths ranging from 100 nm up to several millimetres whose defect chemistry was analysed by electron microscopy tools, monochromatic cathodoluminescence imaging and time resolved photoluminescence spectroscopy. The knowledge of the luminescence properties and the related defect occurrence along with their spatial distribution is pivotal for advancing silica nanowire growth in order to realize successful device designs based on self-assembled Si/SiO(x) nanostructures. We demonstrate a core-shell structure of the grown nanowires with a highly luminescent 150 nm thick shell and outstandingly fast decaying dynamics (approximate to 1 ns) for glass-like materials. The conjunction of the observed efficient and stable luminescences with their attributed decaying behaviours suggests applications for silica nanowires such as active and passive optical interconnectors and white light phosphors. The identification of a time domain difference for the spectral regime from 2.3 to 3.3 eV, within the confined spatial dimensions of a single nanowire, is very promising for future, e. g. data transmission applications, employing silica nanowires which exhibit achievable compatibility with commonly applied silicon-based electronics. A qualitative growth model based on silica particle diffusion and Ti-assisted seed formation is developed for the various types of segregated silica nanowires which extends commonly assumed oxide-assisted growth mechanisms. Sat, 01 Jan 2011 00:00:00 GMT http://hdl.handle.net/10453/18428 2011-01-01T00:00:00Z