Author:Linganiso, EC; Rodrigues, R; Mhlanga, SD; Mwakikunga, Bonex W; Coville, NJ; Hümmelgen, IADate:Dec 2013The wide band-gap semiconductor material gallium nitride was synthesized using a one step microwave-assisted solution phase technique. The synthesized GaN nanocrystals showed an intense ultraviolet-blue emission typical of GaN materials. ...Read more
Author:Spocter, MDate:Mar 2012Gated developments, more commonly known as gated communities, have become a feature of urban living throughout the world. Gated developments in South African cities are a ubiquitous feature of the contemporary urban landscape with many new ...Read more
Author:Badenhorst, Jacob AC; De Wet, FDate:Mar 2023Recent research on deep-learning architectures has resulted in substantial improvements in automatic speech recognition accuracy. The leaps of progress made in well-resourced languages can be attributed to the fact that these architectures ...Read more
Author:Litvin, IA; Forbes, ADate:Oct 2009The authors outline a resonator design that allows for the selection of a Gaussian mode by diffractive optical elements. This is made possible by the metamorphosis of a Gaussian beam into a flat-top beam during propagation from one end of the ...Read more
Author:Ramasami, AK; Reddy, MV; Nithyadharseni, P; Chowdari, BVR; Balakrishna, GRDate:Feb 2017Gel-combustion by a bio-fuel, processed starch of the root tuber of cassava (Manihot esculenta), was used to prepare vanadium pentoxide nanowire clusters (V2O5NWC). The as-synthesized product was characterized by X-ray diffraction (XRD), ...Read more
Author:Van Dijk, JP; Leifert, C; Barros, E; Kok, EJDate:Jan 2010Since the mid 1990s, microarray analysis has become one of the few tools that can analyze the entire contents of a cell regarding a specific information type. Especially since the development of whole genome microarrays the technique can be ...Read more
Author:Booth, R; Meyer, T; Sombattheera, CDate:May 2012Most belief change operators in the AGM tradition assume an underlying plausibility ordering over the possible worlds which is transitive and complete. A unifying structure for these operators, based on supplementing the plausibility ordering ...Read more
Author:Mafusire, C; Forbes, ADate:Jul 2011The authors outline a theory for the calculation of the beam quality factor of an aberrated laser beam. They provide closed form equations that show that the beam quality factor of an aberrated Gaussian beam depends on all primary aberrations ...Read more
Author:Onumanyi, Adeiza J; Abu-Mahfouz, Adnan MI; Hancke, GPDate:Jan 2021Parameter-based adaptive threshold estimators (ATEs) are widely used for signal detection in cognitive radio (CR) systems. However, their performance deteriorates under dynamic spectra conditions owing to a lack of valid methods to accurately ...Read more
Author:Dudley, Angela L; Li, Y; Mhlanga, T; Escuti, M; Forbes, ADate:Sep 2013Nondiffracting vector Bessel beams are of considerable interest due to their nondiffracting nature and unique high-numerical-aperture focusing properties. Here we demonstrate their creation by a simple procedure requiring only a spatial light ...Read more
Author:Alexander, B; Bollinger, JJ; Uys, HermannDate:Jun 2020Many quantum state preparation methods rely on a combination of dissipative quantum state initialization followed by unitary evolution to a desired target state. Here we demonstrate the usefulness of quantum measurement as an additional tool ...Read more
Author:Sayle, TXT; Catlow, CRA; Maphanga, RR; Ngoepe, PE; Sayle, DCDate:21 Sep 2005Models of MnO2 nanoparticles, with full atomistic detail, have been generated using a simulated amorphization and recrystallization strategy. In particular, a 25,000-atom "cube" of MnO2 was amorphized (tension-induced) under molecular dynamics ...Read more
Author:Vasilyeu, R; Dudley, Angela L; Khilo, N; Forbes, ADate:Dec 2009The authors report the first experimental generation of the superposition of higher-order Bessel beams, by means of a spatial light modulator (SLM) and a ring slit aperture. They present illuminating a ring slit aperture with light which has ...Read more
Author:Kiarii, EM; Govender, Krishna; Ndungu, PG; Govender, PGDate:Apr 2017A systematic study of electronic and optical properties of titanium dioxide under visible light was simulated using the first principles calculations. Both electronic and optical properties were studied. The findings support the application ...Read more
Author:Tedesco, P; Cula, J; Ménesguen, C; Penven, P; Krug, Marjolaine JDate:Nov 2019This study addresses the dynamics of the Agulhas inshore front in the submesoscale range upstream of 26 E. Submesoscale frontal eddies are observed in the vicinity of Port Elizabeth (26 E) from satellite images and in observations collected ...Read more
Author:Ruxwana, N; Herselman, Martha E; Pottas, DDate:May 2013Although e-health can potentially facilitate the management of scarce resources and improve the quality of healthcare services, implementation of e-health programs continues to fail or not fulfi l expectations. A key contributor to the failure ...Read more
Author:Ndiaye, M; Abu-Mahfouz, Adnan MI; Hancke, GPDate:Jul 2019Software-defined networking (SDN) promises a wide range of application benefits to the Internet of Things (IoT) including the flexible management of wireless sensor networks (WSNs). While the integration of SDN techniques in WSNs is being ...Read more
Author:Le Roux, Wouter J; Chan, WY; De Maayer, P; Venter, SNDate:Mar 2013Vibrio cholerae, a Gram-negative pathogen autochthonous to the aquatic environment, is the causative agent of cholera. Here, we report the complete genome sequence of V. cholerae G4222, a clinical isolate from South Africa.Read more
Author:Mahaye, Ntombikayise; Thwala, Melusi; Cowan, DA; Musee, EuniceDate:Jul 2017Engineered nanoparticles (ENPs) are an emerging class of environmental contaminants, but are generally found in very low concentrations and are therefore likely to exert sub-lethal effects on aquatic organisms. In this review, we: (i) highlight ...Read more