Author:Kganyago, KR; Ngoepe, PE; Catlow, CRADate:Mar 2003Energetics 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
Author:Gledhill, Irvy MA; Nordstrom, JDate:Sep 2010Fifth-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
Author:Dudley, Angela L; Nock, M; Konrad, T; Forbes, ADate:Mar 2010Since 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
Author:Dudley, Angela L; Litvin, I; Roux, FS; Forbes, ADate:Jul 2012This 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
Author:Singh, A; Smit, Jacoba E; Karsten, AE; Grobler, AF; Sparrow, RWDate:Sep 2010This 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
Author:Naidoo, Darryl; Mafusire, C; Forbes, ADate:Jul 2009An optical aberration is a distortion of an image as compared to the object due to defects in an optical systemRead more
Author:Khumalo, F; Jordaan, J; Abrahamse, H; Land, K; Potgieter, S; Sparrow, RDate:Jul 2009The 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
Author:Neethling, PH; Rohwer, EG; Schwoerer, H; Botha, LDate:Oct 2010The 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
Author:Van Kets, V; Karsten, A; Davids, LDate:Sep 2010Photodynamic 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
Author:Burger, L; Litvin, I; Forbes, ADate:Jul 2012We describe the performance of twisted nematic liquid crystal (TNLC) spatial light modulators (SLMs) when used for intracavity beam shaping.Read more
Author:Roux, FS; Chen, MDate:Sep 2010In 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
Author:Dudley, Angela L; Vasilyeu, R; Forbes, A; Khilo, N; Ropot, PDate:Jul 2009This 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
Author:Karsten, A; Singh, A; Almonem, SADate:Sep 2010Raytracing 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
Author:Yalisi, B; Katumba, G; Forbes, A; Pillay, SRDate:Jun 2009Selective 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
Author:Dudley, Angela L; Forbes, ADate:Apr 2012In 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
Author:Koen, W; Strauss, Hencharl J; Bollig, C; Esser, MJDDate:Sep 2010The 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
Author:Motaung, DE; Moodley, MK; Manikandan, E; Coville, NJDate:2010Single-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
Author:Ubomba-Jaswa, Eunice; Boyle, MAR; McGuigan, KGDate:Dec 2008Solar 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
Author:Nabarro, FRNDate:Feb 1996Some 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