Electronic & Electrical Eng (Scholarly Publications): Recent submissions
Now showing items 261-280 of 610
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Optical spectra of two-dimensional photonic crystal bars based on macroporous Si
(2011)Two-dimensional (2D) photonic crystal (PC) bars with 6 and 21 periods were fabricated by simultaneous photoelectrochemical etching of macropores and trenches in a pre-patterned silicon wafer. The structures had square ... -
Optical properties of grooved silicon structures: theory and experiment
(2011)The reflection spectra of grooved silicon structures consisting of alternating silicon walls and grooves (air channels) with a period of a = 4?6 ?m are studied experimentally and theoretically in the mid-IR spectral range ... -
Transformation of one-dimensional silicon photonic crystal into Fabry-Perot resonator
(2011)The model of transformation of one-dimensional, high-contrast silicon photonic crystal (PC) into a Fabry-Perot resonator is considered. This transformation is achieved either by decreasing the number of periods up to 1.5 ... -
Ruserford Back-scattering and Micro-Raman spectroscopy of composite a-C:Pt films grown by magnetron co-sputtering of graphite and Pt targets by photoelectrochemical etching of silicon
(2010)Raman spectra have been measured in the spectral range from 1000 to 1800 cm?1 on samples of amorphous carbon modified with platinum in amounts comparable with that of carbon. Also, Rutherford backscattering spectra have ... -
Fabrication of one-dimensional photonic crystals by photoelectrochemical etching of silicon
(2010)The conditions of formation of deep periodic trenches by photoelectrochemical etching of n-Si (100) with linear seeds on the surface are analyzed. Criteria for the proper choice of the period of seed grooves and the etching ... -
Sign reversal in the dielectric anisotropy as functions of temperature and frequency in the nematic phase of a bent-core mesogen
(2010)The sign reversal in the dielectricanisotropy(???????) from positive to negative is observed for 4-cyanoresorcinol bisbenzoate system with temperature and frequency in the nematic phase of a bent-core system as the temperature ... -
Macroscopic biaxiality and electric-field-induced rotation of the minor director in the nematic phase of a bent-core liquid crystal
(2010)Biaxiality in the nematic phase has been investigated for the bent-core liquid-crystal para-heptylbenzoate diester, using polarised IR spectroscopy. Anisotropic fluctuations of the nematic director are discussed in terms ... -
Antiferroelectric and ferroelectric orderings in frustrated chiral tilted smectics and a continuous change from anticlinic SmCA* to synclinic SmC*
(2010)In a frustrated binary-mixture system of ferroelectric and antiferroelectric liquid crystals, where the border line between SmCA* and SmC* in the temperature-concentration phase diagram runs almost parallel to the ordinate ... -
Conoscopy of chiral smectic liquid crystal cells
(2008)The conoscopic method for investigating the optical properties of a liquid crystal cell is studied with the aim of determining the effects of the approximations used in the calculation on the results. We confirm that the ... -
HRIR Factorisation: A Regularised Approach
(2010)HRIR factorisation allows the extraction of a common direction in- dependent component from a set of HRIRs leaving a set of rela- tively short direction dependent filters and provides both memory and computational savings ... -
Depth Perception in Interactive Virtual Acoustic Environments using Higher Order Ambisonic Soundfields
(IRCAM (Institut de Recherche et Coordination Acoustique/Musique), 2010)In this paper, we present an investigation into the perception of source depth in interactive virtual auditory environments in the context of Higher Order Ambisonic (HOA) reproduction. In particular, we investigate the ... -
Dynamic Time Warping for Acoustic Response Interpolation: Possibilities and Limitations
(2009)We present a novel method for the interpolation of the direct and early reflection components in acoustic impulse responses. The method utilizes Dynamic Time Warping for automated temporal alignment of the sparse reflections. ... -
Sequence of Four Orthogonal Smectic Phases in an Achiral Bent-Core Liquid Crystal: Evidence for the SmAP(alpha) Phase
(2011)The mesomorphic properties of an achiral bent-core liquid crystal derived from 4-cyanoresorcinol are studied by polarizing optical microscopy, x-ray diffraction, and second harmonic electro-optic response. It shows a novel ... -
Reversal and pinning of Curie point transformations in thin film piezoelectrics
(2011)The Curie point for a rhombohedral piezoelectric thin film was established by in situ micro-Raman spectroscopy. The hysteresis in phase reversal and specific thermal conditions for disrupting such reversal were determined. -
Speech Intelligibility prediction using a Neurogram Similarity Index Measure
(Elsevier, 2012)Discharge patterns produced by fibres from normal and impaired auditory nerves in response to speech and other complex sounds can be discriminated subjectively through visual inspection. Similarly, responses from auditory ... -
Intra-well relaxation process in magnetic fluids subjected to strong polarising fields
(Elsevier, 2011)We report on the frequency and field dependent complex magnetic susceptibility measurements of a kerosene-based magnetic fluid with iron oxide nanoparticles, stabilized with oleic acid, in the frequency range 0.1?6 GHz and ... -
A Combinatorial Optimisation Approach to the Design of Dual Parented Long-Reach Passive Optical Networks
(2011)We present an application focused on the design of resilient long-reach passive optical networks. We specifically consider dual-parented networks whereby each customer must be connected to two metro sites via local exchange ... -
Characterisation of thin film silicon films deposited by plasma enhanced chemical vapour deposition at 162MHz, using a large area, scalable, multi-tile-electrode plasma source
(2011)Large area (600 ? 720 mm) depositions of hydrogenated microcrystalline silicon (?c-Si:H) have been achieved at high deposition rates using a scalable, multi-tile electrode topology. Depositions have shown local results of ... -
A Variational Bayes Approach to Decoding in a Phase-Uncertain Digital Receiver
(2011)This paper presents a Bayesian approach to symbol and phase inference in a phase-unsynchronized digital receiver. It primarily extends [Quinn 2011] to the multi-symbol case, using the variational Bayes (VB) approximation ... -
Silicon photonic crystal filter with ultrawide passband characteristics
(2011)We report on what is believed to be the first example of an ultrawide, bandpass filter, based on a high-contrast multicomponent one-dimensional Si photonic crystal (PC). The effect of the disappearance of a limited number ...
