Browsing Faculty of Natural Sciences@PUK by Title
Now showing items 2183-2202 of 2250
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Vaccinium exul
(South African National Biodiversity Institute, 2015) -
Validation of the short self–regulation questionnaire in a group of black teachers: the SABPA study
(AOSIS, 2013)Orientation: Recent literature has emphasised the important role that self-regulation plays in the mental health of individuals. The lack of a validated psychometric instrument to accurately measure self-regulation amongst ... -
Validation of using a modified BET model to predict the moisture adsorption behavior of bituminous coal
(Taylor & Francis, 2016)A good correlation exists between the amount of moisture adsorbed and the oxygen content of medium-rank B vitrinite-rich and medium-rank C inertinite-rich bituminous coal. Total mass moisture adsorbed per gram of coal ... -
Validation tests for semi-parametric models
(Taylor & Francis, 2015)Tests are proposed for validation of the hypothesis that a partial linear regression model adequately describes the structure of a given data set. The test statistics are formulated following the approach of Fourier-typ ... -
Value-focused assessment of ICT security awareness in an academic environment
(Elsevier, 2007)Security awareness is important to reduce human error, theft, fraud, and misuse of computer assets. A strong ICT security culture cannot develop and grow in a company without awareness programmes. This paper focuses on ICT ... -
Value-focused assessment of information communication and technology security awareness in an academic environment
(Springer, 2006)The aim of this paper is to introduce the approach of value-focused thinking when identifying information and communications technology (ICT) security awareness aspects. Security awareness is important to reduce human ... -
Variable importance in latent variable regression models
(Wiley, 2014)The quality and practical usefulness of a regression model are a function of both interpretability and prediction performance. This work presents some new graphical tools for improved interpretation of latent variable ... -
Variable selection for binary classification using error rate p-values applied to metabolomics data
(BioMed Central, 2016)Background: Metabolomics datasets are often high-dimensional though only a limited number of variables are expected to be informative given a specific research question. The important task of selecting informative variables ... -
Variable-temperature X-ray powder diffraction analysis of the crystal transformation of the pharmaceutically preferred polymorph C of mebendazole
(Elsevier, 2005)Mebendazole is a common benzimidazole anthelmintic that is water insoluble. It is reported to exist in three different polymorphic forms in the solid state, i.e. polymorph A, B and C. Form C is the pharmaceutically preferred ... -
The vegetation and floristics of the Letaba exclosures, Kruger National Park, South Africa
(AOSIS OpenJournals, 2010) -
The Vegetation and Floristics of the Nkhuhlu Exclosures, Kruger National Park.
(OpenJournals Publishing, 2008)The need to conduct research on the impact of elephant on the environment prompted the construction of exclosures along two of the most important rivers in the Kruger National Park. Scientific research on these exclosures ... -
Vegetation associated with the occurrence of the Brenton blue butterfly
(National Research Foundation, 2008) -
Vegetation dynamics and mesophication in response to conifer encroachment within an ultramafic system
(CSIRO Publishing, 2015)The biological, ecological, and evolutionary significance of serpentine habitats has long been recognised. We used an integrated physiochemical dataset combining plot spatial data with temporal data from tree cores to ... -
Vein graphite deposits: geological settings, origin, and economic significance
(Springer, 2014)Graphite deposits result from the metamorphism of sedimentary rocks rich in carbonaceous matter or from precipitation from carbon-bearing fluids (or melts). The latter process forms vein deposits which are structurally ... -
The vela pulsar: results from the first year of Fermi LAT observations
(IOP Publishing, 2010)We report on analysis of timing and spectroscopy of the Vela pulsar using 11 months of observations with the Large Area Telescope (LAT) on the Fermi Gamma-ray Space Telescope. The intrinsic brightness of Vela at GeV energies ... -
The vela pulsar: Results from the first year of fermi lat observations
(Institution of Physics (IOP), 2010) -
Verbetering van die voorspellingsakkuraatheid van regressiemodelle met minimale aannames
(Litnet, 2013)Die voorspellingsakkuraatheid van 'n regressiemodel maak in 'n groot mate staat op die toepaslikheid van die modelbouer se aannames. Daarbenewens kan die teenwoordigheid van uitskieters ook tot modelle lei wat onbetroubaar ... -
Veritas observations of six bright, hard-spectrum fermi-LAT blazars
(IOP publising, 2012)We report on VERITAS very high energy (VHE; E ⩾ 100 GeV) observations of six blazars selected from the Fermi Large Area Telescope First Source Catalog (1FGL). The gamma-ray emission from 1FGL sources was extrapolated up ... -
Verspreiding en habitats van drie lewerbot-tussen-gashere in Suid-Afrika en die gesondheidsimplikasies daarvan
(National Research Foundation, 2008)
