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Browsing by Subject "Physics"

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Ab initio calculation of the voltage profile for LiC6

Author: Kganyago, KR ; Ngoepe, PE ; Catlow, CRA Date: Mar 2003 Energetics of the anode system LiC6 compared to metallic lithium is calculated within the framework of local-density functional theory (LDA-DFT) techniques. Our results suggest that the energy of anode intercalation results in a small change ... Read more
Aerodynamics in arbitrarily accelerating frames: application to high-g turns

Author: Gledhill, Irvy MA ; Nordstrom, J Date: Sep 2010 Fifth-generation missilies accelerate up to 100 g in turns, and higher accelerations are expected as agility increases. The authors have developed the theory of aerodynamics for arbitrary accelerations, and have validated modelling in a ... Read more
Amplitude damping channel for orbital angular momentum

Author: Dudley, Angela L ; Nock, M ; Konrad, T ; Forbes, A Date: Mar 2010 Since the pioneering work on the entanglement of the orbital angular momentum (OAM) states of light, much attention has been devoted to the subject, with particular attention into the quantum aspects of information processing using OAM. ... Read more
Azimuthal decomposition of optical modes

Author: Dudley, Angela L ; Litvin, I ; Roux, FS ; Forbes, A Date: Jul 2012 This presentation analyses the azimuthal decomposition of optical modes. Decomposition of azimuthal modes need two steps, namely generation and decomposition. An azimuthally-varying phase (bounded by a ring-slit) placed in the spatial frequency ... Read more
Comparative attenuation spectra of liquid skin-like phantoms

Author: Singh, A ; Smit, Jacoba E ; Karsten, AE ; Grobler, AF ; Sparrow, RW Date: Sep 2010 This study aims to extract and compare attenuation coefficients of different liquid skin-like phantoms representing Skin Types 1 to V1 with two methods, Spectrophotometric and Integrating Sphere methods. The correlation between the results ... Read more
Demonstrating optical aberrations in the laboratory

Author: Naidoo, Darryl ; Mafusire, C ; Forbes, A Date: Jul 2009 An optical aberration is a distortion of an image as compared to the object due to defects in an optical system Read more
Design and fabrication of a micro fluidic circuit for the separation of micron sized particles

Author: Khumalo, F ; Jordaan, J ; Abrahamse, H ; Land, K ; Potgieter, S ; Sparrow, R Date: Jul 2009 The development of a micro fluidic circuit for the separation of micro particles is being investigated. There are a wide range of available separation techniques such as acoustic, laminar flow, split flow, optical trapping and centrifugal ... Read more
Determination of the emissivity of the tungsten hexa-ethoxide pyrolysis flame using Fourier Transform Infrared (FTIR) spectroscopy

Author: Mudau, AE ; Mwakikunga, Bonex W ; Brink, N ; Willers, Cornelius J ; Forbes, A ; Shikwambana, L ; Govender, M Date: Sep 2010 To determination the temperature using infrared cameras, the following issues need to be addressed, the emissivity of the object and atmospheric path effects. The later is negligible in the setup used. In this paper authors present the ... Read more
Development of a high power femtosecond laser

Author: Neethling, PH ; Rohwer, EG ; Schwoerer, H ; Botha, L Date: Oct 2010 The Laser Research Institute and the CSIR National Laser Centre are developing a high power femtosecond laser system in a joint project with a phased approach. The laser system consists of an fs oscillator and a regenerative amplifier. An ... Read more
Different light sources in photodynamic therapy for use in photorejuvenation

Author: Van Kets, V ; Karsten, A ; Davids, L Date: Sep 2010 Photodynamic therapy (PDT) has recently emerged as a treatment modality for photorejuvenation of the skin. This study is a preliminary investigation into the effect of different light sources to activate hypericin, a plant-derived photosensitizer ... Read more
Digital mode selection using an intracavity SLM

Author: Burger, L ; Litvin, I ; Forbes, A Date: Jul 2012 We describe the performance of twisted nematic liquid crystal (TNLC) spatial light modulators (SLMs) when used for intracavity beam shaping. Read more
Evolution of the optical vortex density in phase corrected speckle fields

Author: Roux, FS ; Chen, M Date: Sep 2010 In an attempt to understand the process whereby the phase modulation due to atmospheric turbulance causes phase singularities (also called optical vortices), the authors investigated the effect of phase perturbations in speckle beams. They ... Read more
Experimental generation and application of the superposition of higher-order Bessel beams

Author: Dudley, Angela L ; Vasilyeu, R ; Forbes, A ; Khilo, N ; Ropot, P Date: Jul 2009 This presentation provides information on experimental generation and application of the superposition of higher-order Bessel beams. The superposition of zero order Bessel beams can be used to measure the radius of curvature of a reflecting ... Read more
Experimental phantom verification studies for simulations of light interactions with skin: liquid phantoms

Author: Karsten, A ; Singh, A ; Almonem, SA Date: Sep 2010 Raytracing computer models are valuable tools to determine the fluence at a specific depth into issue, but need to be verified before they can be used with confidence. Such a model for skin showed good agreement (within 10%) when compared ... Read more
Fabrication of selective solar absorbers using pulsed laser deposition

Author: Yalisi, B ; Katumba, G ; Forbes, A ; Pillay, SR Date: Jun 2009 Selective solar absorbers are devices that have been designed to absorb as much as possible of the solar radiation which is in the wavelength range of 0.3 to 2.5 µm and to minimise thermal emittance in the wavelength range from 2.5µm to the ... Read more
From stationary annular rings to rotating Bessel beams

Author: Dudley, Angela L ; Forbes, A Date: Apr 2012 In this work we use a phase-only spatial light modulator (SLM) to mimic a ring-slit aperture, containing multiple azimuthally varying phases at different radial positions. The optical Fourier transform of such an aperture is currently known ... Read more
High-power diode-end-pumped Tm:YLF slab laser delivering 189 W at 1890 nm

Author: Koen, W ; Strauss, Hencharl J ; Bollig, C ; Esser, MJD Date: Sep 2010 The authors present a high-power Tm:YLF slab laser double-end-pumped by two 300 W laser diode stacks. The resonator was designed such that the laser emitted at 1890 nm instead of the conventional operating wavelength of 1912 nm. At full ... Read more
In situ optical emission study on the role of C2 in the synthesis of singlewalled carbon nanotubes

Author: Motaung, DE ; Moodley, MK ; Manikandan, E ; Coville, NJ Date: 2010 Single-walled carbon nanotubes (SWCNTs) are unique one-dimensional nanostructure with extraordinary electronic, thermal, optical, and mechanical properties. These properties make SWCNTs suitable materials for a wide range of advanced technological ... Read more
Inactivation of enteropathogenic E. coli by solar disinfection (SODIS) under simulated sunlight conditions

Author: Ubomba-Jaswa, Eunice ; Boyle, MAR ; McGuigan, KG Date: Dec 2008 Solar Disinfection (SODIS) is a low cost water treatment method currently used in communities that do not have year round access to safe water. However, there is still reluctance in widespread adoption of this treatment method due to a number ... Read more
Inclusions and inhomogeneities under stress

Author: Nabarro, FRN Date: Feb 1996 Some general theorems, new and old, concerning the behaviour of elastic inclusions and inhomogeneities in bodies without or with external stress, are assembled. The principal new result is that arbitrary external tractions cannot influence ... Read more

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