Browsing Faculty of Natural and Agricultural Sciences by Title
Now showing items 2491-2510 of 4820
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KAT-7 detection of radio halo emission in the Triangulum Australis galaxy cluster
(Oxford University Press, 2015)We report the presence of high significance diffuse radio emission from the Triangulum Australis cluster using observations made with the KAT-7 telescope and propose that this emission is a giant radio halo. We compare the ... -
Kernel bandwidth estimation for non-parametric density estimation: a comparative study
(Pattern recognition association of South Africa (PRASA), 2013)We investigate the performance of conventional bandwidth estimators for non- parametric kernel density estimation on a number of representative pattern-recognition tasks, to gain a better understanding of the behaviour of ... -
Key elements of an information security culture in organisations
(Emerald, 2019)Purpose The purpose of this paper is to report on a study that investigated the information security culture in organisations in South Africa, with the aim of identifying key aspects of the culture. The unique aspects for ... -
Key factors controlling massive graphite deposition in volcanic settings: an example of a self–organized critical system
(Geological Society of London, 2012)Massive graphite deposition resulting in volumetrically large occurrences in volcanic environments is usually hindered by the low carbon contents of magmas and by the degassing processes occurring during and after magma ... -
The khumani approach to homeownership in Postmasburg
(Routledge, 2018) -
KIC 8263801: a clump star in the Kepler open cluster NGC 6866 field?
(Elsevier, 2016)In this paper we study the field of Kepler open cluster NGC 6866 using the data obtained from Kepler mission collected for a period of 4 years. We search for the red clump (RC) stars amongst the red giant (RG) stars showing ... -
Kinetic analysis, size profiling, and bioenergetic association of DNA released by selected cell lines in vitro
(Springer, 2017)Although circulating DNA (cirDNA) analysis shows great promise as a screening tool for a wide range of pathologies, numerous stumbling blocks hinder the rapid translation of research to clinical practice. This is related ... -
Kinetic evaluation of the hydroformylation of the post-metathesis product 7-tetradecene using a bulky phosphite-modified rhodium catalyst
(RSC, 2019)The reaction engineering kinetics for the hydroformylation of the post-metathesis product 7-tetradecene using the bulky phosphite-modified rhodium catalyst Rh-tris(2,4-di-tertbutylphenyl)phosphite were evaluated. The ... -
A kinetic expression for the pyrolytic decomposition of polyterafluoroethylene
(Elsevier, 2008)Despite the fact that the thermal decomposition of polytetrafluoroethylene has been extensively studied over the past six decades, some inconsistencies regarding the kinetic parameters, e.g. the order of the reaction, ... -
Kinetic simulation study of electron holes dynamics during collisions of ion-acoustic solitons
(IEEE, 2017)Ion acoustic (IA) solitons are accompanied by vortex-shaped nonlinear structures (e.g., hollows, plateaus, or humps) in the electron distribution function, called electron holes, portraying trapped electrons. These structures ... -
Kinetic-simulation study of propagation of Langmuir-like ionic waves in dusty plasma
(IEEE, 2017)The propagation of ionic perturbations in a dusty plasma is considered through a three-species kinetic simulation approach, in which the temporal evolution of all three elements, i.e., electrons, ions, and dust particles ... -
King lll information technology governance requirements - an international comparison
(The Social Sciences Research Society, 2016)Information Technology (IT) has become essential due to its beneficial role in various aspects of business, including financial reporting. However, IT s involvement in central components of business operations have caused ... -
KM3NeT front-end and readout electronics system: hardware, firmware, and software
(SPIE, 2019)The KM3NeT research infrastructure being built at the bottom of the Mediterranean Sea will host water-Cherenkov telescopes for the detection of cosmic neutrinos. The neutrino telescopes will consist of large volume ... -
Knowledge and attitude towards collaboration in agricultural innovation systems amongst stakeholders in the North West Province, South Africa
(South African Society for Agricultural Extension (SASAE), 2017)The current study examined the extent of knowledge concerning agricultural innovation systems amongst researchers, extension agents, farmers, input dealers, and marketers, while determining their attitude towards collaborating ... -
Knowledge and psychosocial wellbeing of nurses caring for people living with HIV/AIDS (PLWH)
(Elsevier, 2016)The challenges of caring for people living with HIV (PLWH) in a low-resource setting has had a negative impact on the nursing profession, resulting in a shortage of skilled nurses. In response to this shortage and perceived ... -
Knowledge and skills requirements for software developer student
(ICETC, 2014)It is widely acknowledged that there is a shortage of software developers, not only in South Africa, but also worldwide. Despite reports on a gap between industry needs and software education, the gap has mostly been ... -
Knowledge and uptake of occupational post-exposure prophylaxis amongst nurses caring for people living with HIV
(AOSIS, 2016)Background: Nurses caring for people living with HIV (PLWH) are at higher risk of exposure to the human immunodeficiency virus (HIV) by needle sticks, cuts, getting body fluids in their eyes or mouth and skin when bruised ... -
The Kolmogorov–Čentsov theorem and Brownian motion in vector lattices
(Elsevier, 2014)The well known Kolmogorov–Čentsov theorem is proved in a Dedekind complete vector lattice (Riesz space) with weak order unit on which a strictly positive conditional expectation is defined. It gives conditions that guarantee ... -
Kontrasterende invloed van chroniese osoonblootstelling op fotosintetiese elektronoordrag en CO2-assimilering in gevoelige (S156) en bestande (R123) Phaseolus vulgaris L. genotipes
(Suid-Afrikaans Akademie vir Wetenskap en Kuns, 2018)Troposferiese osoon (O3) word beskou as een van die belangrikste lugbesoedelstowwe aangesien dit wêreldwyd meer skade aan landbougewasse aanrig as al die ander besoedelstowwe saam. Weens die oksiderende aard daarvan ... -
Korttermynbedreigings vir varswater–Mollusca in die Olifantsrivier en enkele sytakke
(AOSIS, 2013)Short-term threats for the sustained survival of freshwater Mollusca in the Olifants River and selected tributaries. The conservation status of less than 2% of the more or less 7000 mollusk species known worldwide have ...
