Browsing Faculty of Natural Sciences by Title
Now showing items 2211-2230 of 2571
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A spitzer survey of deep drilling fields to be targeted by the Vera C. Rubin observatory legacy survey of space and time
(Oxford University Press, 2021)The Vera C. Rubin Observatory Legacy Survey of Space and Time (LSST) will observe several Deep Drilling Fields (DDFs) to a greater depth and with a more rapid cadence than the main survey. In this paper, we describe the ... -
Sport, sex and age increase risk of illness at the Rio 2016 Summer Paralympic Games: a prospective cohort study of 51 198 athlete days
(BMJ, 2018)OBJECTIVETo describe the epidemiology of illness at the Rio 2016 Summer Paralympic Games. METHODS A total of 3657 athletes from 78 countries, representing 83.5% of all athletes at the Games, were monitored on the ... -
Spray‐pyrolyzed Cd‐substituted kesterite thin‐films for photovoltaic applications: Post annealing conditions and property studies
(Elsevier, 2023)Kesterite materials were investigated for their suitability as absorber layers for thin-film photovoltaic cells. Thin- films of copper cadmium zinc tin sulfide (Cu2CdxZn1-xSnS4) were prepared by spray pyrolysis on soda-lime ... -
Sputtered Si and Mg doped hydroxyapatite for biomedical applications
(IOP Publishing, 2018-01-30)Hydroxyapatite (HAP) coatings are applied on metallic implant materials to combine mechanical properties of metallic material with bioactivity abilities of HAP ceramic. In this study, HAP coatings with additions of Si ... -
The stability and anti-angiogenic properties of titanium dioxide nanoparticles (tio2nps) using caco-2 cells
(MDPI, 2022)Titanium dioxide nanoparticles (TiO2NPs) are found in a wide range of products such as sunscreen, paints, toothpaste and cosmetics due to their white pigment and high refractive index. These wide-ranging applications ... -
Stability of an SEIR epidemic model with indepenent stochastic perturbations
(Elsevier, 2013)For an epidemic model of the type mentioned, we prove a theorem on almost sure exponential stability of the disease-free equilibrium. For small values of the diffusion parameter, σ, we describe the stability of the disease ... -
Stacked reverberation mapping
(Oxford University Press, 2013)Over the past 20 years reverberation mapping has proved one of the most successful techniques for studying the local (<1 pc) environment of supermassive black holes that drive active galactic nuclei. Key successes of ... -
Stakeholder-derived recommendations and actions to support deep-reef conservation in the Western Indian Ocean
(Wiley, 2022)Deep reefs below 30mprovide essential ecosystem services for ocean health and human well-being such as food security and climate change resilience. Yet, deep reefs remain poorly researched and largely unprotected, including ... -
The star formation rates of QSOs
(Royal Astronomical Society, 2022)We examine the far-IR properties of a sample of 5391 optically selected QSOs in the 0.5 < z < 2.65 redshift range down to log [νLν,2500(erg/s)] > 44.7, using SPIRE data from Herschel-ATLAS. We split the sample in a grid ... -
The star-formation history of mass-selected galaxies from the VIDEO survey
(Oxford University Press, 2014)We measure star formation rates (SFRs) and specific SFRs (SSFRs) of Ks-selected galaxies from the VISTA Deep Extragalactic Observations survey by stacking 1.4 GHz Very Large Array data. We split the sample, which spans 0 ... -
Starspot modelling of the TESS light curve of CVSO 30
(EDP Sciences, 2021)Aims. I aim to investigate whether the photometric variability in the candidate host star CVSO 30 can be explained by starspots. Methods. The Transiting Exoplanet Survey Satellite (TESS) light curve of CVSO 30 is separated ... -
State-of-the-art review on relevance of genetic algorithm to internet web search
(Hindawi Publishing Corporation, 2012)People use search engines to find information they desire with the aim that their information needs will be met. Information retrieval (IR) is a field that is concerned primarily with the searching and retrieving of ... -
Static reservoir modeling using stochastic method: A case study of the cretaceous sequence of Gamtoos Basin, Ofshore, South Africa
(Springer, 2021)Gamtoos Basin is an echelon sub-basin under the Outeniqua ofshore Basin of South Africa. It is a complex rift-type basin with both onshore and ofshore components and consists of relatively simple half-grabens bounded by ... -
Statistical gamma-ray decay studies at iThemba LABS
(EDP Sciences, 2017)Abstract. A program to study the γ -ray decay from the region of high-level density has been established at iThemba LABS, where a high-resolution gamma-ray detector array is used in conjunction with silicon particle-telescopes. ... -
Statistical recovery of 21 cm visibilities and their power spectra with gaussian-constrained realizations and gibbs sampling
(The Astrophysical Journal Supplement Series, 2023)Radio interferometers designed to probe the 21 cm signal from Cosmic Dawn and the Epoch of Reionization must contend with systematic effects that make it difficult to achieve sufficient dynamic range to separate the 21 cm ... -
Statistical recovery of the BAO scale from multipoles of the beam-convolved 21 cm correlation function
(Royal Astronomical Society, 2021)Despite being designed as an interferometer, theMeerKAT radio array (a Square Kilometre Array pathfinder) can also be used in autocorrelation (‘single-dish’) mode, where each dish scans the sky independently. Operating ... -
Statistical testing of input factors in the carbonation of brine impacted fly ash
(Taylor & Francis, 2012)A D-optimal design was applied in the study of input factors: temperature, pressure, solid/liquid (S/L) ratio and particle size and their influence on the carbonation of brine impacted fly ash (FA) determined. Both ... -
Statistical tests for changes in the amplitude, frequency or phase of a sinusoidal variation
(Oxford University Press, 2009)The problem considered is that of testing for small changes over time in the properties of a sinusoidal signal contaminated by noise. Two test statistics are proposed. The first is a frequency domain statistic based on ... -
Status of sperm functionality assessment in wildlife species: From fish to primates
(2021-05)(1) Background: in order to propagate wildlife species (covering the whole spectrum from species suitable for aquaculture to endangered species), it is important to have a good understanding of the quality of their sperm, ... -
Steady‐state population pharmacokinetics of terizidone and itsmetabolite cycloserine in patients with drug‐resistanttuberculosis
(Wiley, 2019)Despite terizidone being part of the second‐line recommended drugs fortreatment of drug‐resistant tuberculosis (DR‐TB), information on its pharmacokineticsis scarce. The aim of this study was to describe the steady‐state ...