Browsing Faculty of Natural and Agricultural Sciences by Title
Now showing items 3656-3675 of 4825
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Radiation and polarization signatures of the 3D multizone time-dependent hadronic blazar model
(IOP Publishing, 2016)We present a newly developed time-dependent three-dimensional multizone hadronic blazar emission model. By coupling a Fokker–Planck-based lepto-hadronic particle evolution code, 3DHad, with a polarization-dependent radiation ... -
Radio afterglows of very high-energy gamma-ray bursts 190829A and 180720B
(Oxford Univ Press, 2020)We present high-cadence multifrequency radio observations of the long gamma-ray burst (GRB) 190829A, which was detected at photon energies above 100 GeV by the High Energy Stereoscopic System (H.E.S.S.). Observations with ... -
Radio frequency interference detection using machine learning
(IEEE, 2016)Radio frequency interference (RFI) has plagued radio astronomy which potentially might be as bad or worse by the time the Square Kilometre Array (SKA) comes up. RFI can be either internal (generated by instruments) or ... -
Radio imaging of the very-high-energy y-ray emission region in the central engine of a radio galaxy
(Science AAAS, 2009)The accretion of matter onto a massive black hole is believed to feed the relativistic plasma jets found in many active galactic nuclei (AGN). Although some AGN accelerate particles to energies exceeding 1012 electron ... -
Radio observations of the region around the pulsar wind nebula HESSJ1303-631 with ATCA
(EDP Sciences, 2017)Radio observations of the region surrounding PSR J1301−6305 at 5.5 GHz and 7.5 GHz were conducted with ATCA on September 5, 2013. The observations were dedicated to the search of the radio counterpart of the evolved pulsar ... -
Radio sources associated with optical galaxies and having unresolved or extended morphologies (ROGUE). I. A catalog of SDSS galaxies with first core identifications
(IOP, 2020)We present the catalog of Radio sources associated with Optical Galaxies and having Unresolved or Extended morphologies I (ROGUE I), consisting of 32,616 spectroscopically selected galaxies. It is the largest handmade ... -
Radio to gamma-ray variability study of blazar S5 0716+714
(EDP Sciences, 2013)We present the results of a series of radio, optical, X-ray, and γ-ray observations of the BL Lac object S50716+714 carried out between April 2007 and January 2011. The multifrequency observations were obtained using several ... -
Radionuclide exposure in animals and the public health implications
(TÜBİTAK, 2015)Living tissues are usually exposed to varying degrees of radiation from natural and manmade radioactive substances. Depending on the type of radiation emitted and rate and dose of absorption, all radioactive substances ... -
Radionuclides and toxic elements transfer from the princess dump to water in Roodepoort, South Africa
(Elsevier, 2016)High concentrations of radionuclides and toxic elements in gold mine tailings facilities present a health hazard to the environment and people living near that area. Soil and water samples from selected areas around the ... -
Ramsar-vleilande in Suid-Afrika: historiese en huidige akwatiese navorsing
(Suid-Afrikaans Akademie vir Wetenskap en Kuns, 2018)Vleilande verskaf ’n verskeidenheid van goedere en funksies en dus moet die vleilande wat nog natuurlik is, beskerm word. Die Ramsar-konvensie vir vleilande van internasionale belang is al vanaf 1975 in werking in Suid-Afrika ... -
Range expansion of the Common Dwarf Gecko, Lygodactylus capensis: South Africa’s most successful reptile invader
(SEH, 2019)Here we describe the invasion history in South Africa of the Common Dwarf Gecko Lygodactylus capensis (Smith, 1849), particularly into areas distant from its native range. We provide maps that include detailed records ... -
Rank one perturbations of H-positive real matrices
(Elsevier, 2013)We consider a generic rank one structured perturbation on H-positive real matrices. The case with complex rank one perturbation is treated in general, but the main focus of this article is the real rank one perturbation. ... -
RAPD profiling of Bacillus spp with PGPR potential and their effects on mineral composition of tomatoes
(Kamla-Raj, 2016)Bacillus species have been known to antagonize and inhibit the growth of various plant pathogens but quality of crop from such plants is yet to be investigated. The aim of this study is to analyze the mineral composition ... -
Rapid changes in biomass burning aerosols by atmospheric oxidation
(Wiley, 2014)Primary and secondary aerosol particles originating from biomass burning contribute significantly to the atmospheric aerosol budget and thereby to both direct and indirect radiative forcing. Based on detailed measurements ... -
Rapid Global Expansion of the Fungal Disease Chytridiomycosis into Declining and Healthy Amphibian Populations
(Public Library of Science (PLoS), 2009) -
Rapid thermal cycling of three phase change materials (PCMs) for cooking applications
(Springer, 2018)The suitability of the use of acetanilide, meso-erythritol and In-48Sn as phase change materials (PCMs) in latent heat thermal storage systems (LHTES) for cooking applications has been investigated under high charging and ... -
Rasch analysis of the Meaning in life Questionnaire among adults from South Africa, Australia, and New Zealand
(BioMed Central, 2016)Background: Meaning in life is a key indicator of subjective well-being and quality of life. Further developments in understanding and enhancing the construct will depend inter alia on the sound measurement thereof. This ... -
The rate of release of Cry1Ab protein from Bt maize leaves into water. Short communication
(WRC, 2019)Transgenic Bt maize plants are genetically modified to contain genes of Bacillus thuringiensis that encode for δ-endotoxins (Cry1Ab protein) that have insecticidal properties. These endotoxins target certain lepidopteran ... -
Rational matrix solutions to the Leech equation: the Ball-Trent approach revisited
(Elsevier, 2013)Using spectral factorization techniques, a method is given by which rational matrix solutions to the Leech equation with rational matrix data can be computed explicitly. This method is based on an approach of J.A. Ball ... -
Rational solutions to an extended Kadomtsev-Petviashvili-like equation with symbolic computation
(Elsevier, 2016)Associated with the prime number p = 3, the generalized bilinear operators are adopted to yield an extended Kadomtsev-Petviashvili-like (eKP-like) equation. With symbolic computation, eighteen classes of rational solutions ...