Browsing Faculty of Natural and Agricultural Sciences by Title
Now showing items 998-1017 of 4825
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Data transformations and goodness-of-fit tests for type-II right censored samples
(Springer, 2015)We suggest several goodness-of-fit (GOF) methods which are appropriate with Type-II right censored data. Our strategy is to transform the original observations from a censored sample into an approximately i.i.d. sample ... -
The database of the PREDICTS (Projecting Responses of Ecological Diversity In Changing Terrestrial Systems) project
(Wiley, 2017)The PREDICTS project—Projecting Responses of Ecological Diversity In Changing Terrestrial Systems (www.predicts.org.uk)—has collated from published studies a large, reasonably representative database of comparable samples ... -
DC electrical conductivity of nano-composite polystyrene–titanium– arsenate membrane
(ELSEVIER, 2013)In continuation to our previous work with nano-composite polystyrene–titanium–arsenate (PS–Ti–As), we further extended the characterization by means of DSC, TEM and mercury porosimetry measurements. In addition to the ... -
DDT and malaria prevention: addressing the paradox
(Superintendent of Documents, 2011)Background The debate regarding dichlorodiphenyltrichloroethane (DDT) in malaria prevention and human health is polarized and can be classified into three positions: anti-DDT, centrist-DDT, pro-DDT. Objective We ... -
DDT contamination from indoor residual spraying for malaria control
(Elsevier, 2010) -
DDT exposure of frogs: a case study from Limpopo Province, South Africa
(Elsevier, 2016)Amphibians are globally under pressure with environmental contaminants contributing to this. Despite caution aired more than 80 years ago of threats posed to amphibians by DDT spraying for disease vector control, no data ... -
DDT residues in water, sediment, domestic and indigenous biota from a currenlty DDT-sprayed area
(Elsevier Science Ltd, 2009) -
DDTs and other organochlorine pesticides in tissues of four bird species from the Rift Valley region, Ethiopia
(Elsevier, 2017)Despite the presence of a wide variety and number of birds, there is exceedingly little data on organochlorine pesticide (OCP) residues in birds inhabiting in Africa. In the present study, concentrations of dichlorodiphe ... -
Deception improves time trial performance in well-trained cyclists without augmented fatigue
(Wolters Kluwer, 2018)Purpose To investigate the effects of feedback, in the form of a virtual avatar paced at 100% and 102% of baseline performance, on neuromuscular fatigue after a 4-km cycling time trial (TT). We hypothesized that improved ... -
Decomposing blazar spectra into lepto‐hadronic emission components
(Wiley, 2018)The recently reported coincidences between high‐energy neutrino events and major blazar outbursts reinforce the relevance of lepto‐hadronic emission models for blazars. We study the influence of physical parameters on the ... -
Decomposition of subtropical fruit tree leaf litter at Nelspruit, South Africa
(Taylor & Francis, 2015)There is limited information about the decomposition of leaf litter from subtropical fruit trees despite their potential for managing soil fertility. The aim of this study was to quantify the effect of quality on decomposition ... -
Deep-brain stimulation associates with improved microvascular integrity in the subthalamic nucleus in Parkinson's disease
(Elsevier, 2015)Deep brain stimulation (DBS) of the subthalamic nucleus (STN) has become an accepted treatment for motor symptoms in a subset of Parkinson's disease (PD) patients. The mechanisms why DBS is effective are incompletely ... -
Deeper H.E.S.S. observations of Vela Junior (RX J0852.0-4622): morphology studies and resolved spectroscopy
(EDP Sciences, 2018)Aims. We study γ-ray emission from the shell-type supernova remnant (SNR) RX J0852.0−4622 to better characterize its spectral properties and its distribution over the SNR. Methods. The analysis of an extended High Energy ... -
Deeper knowledge of shallow waters: reviewing the invertebrate fauna of southern African temporary wetlands
(Springer, 2019)Temporary lentic wetlands are becoming increasingly recognised for their collective role in contributing to biodiversity at the landscape scale. In southern Africa, a region with a high density of such wetlands, information ... -
Default weighted survival analysis to directly model loss given default
(SASA, 2018)Traditionally when predicting loss given default (LGD), the following models can be used: beta regression, inverse beta model, fractional response regression, ordinary least squares regression, survival analysis, run-off ... -
Defensive active coping facilitates chronic hyperglycaemia and endothelial dysfunction in African men: the SABPA study
(Elsevier, 2013)Background: Dissociation between behavioural defensive active coping (AC) control albeit physiological “loss of control” responses was associated with silent ischaemia and structural wall abnormalities in African men. Whether ... -
Defensive coping facilitated a smaller cortisol-to-estradiol ratio and a higher hypertension risk: the SABPA study
(Taylor & Francis, 2018)Objectives: Taxing psychosocial stress and defensive coping have been associated with hypoactivity in cortisol, a vasoconstrictive agent. Estradiol has vasodilatory properties with cardio- and neuroprotective effects. It ... -
Defining the role of the independent environmental control officer (ECO) in compliance monitoring and enforcement
(University of KwaZulu-Natal, 2012)Currently an entire unregulated industry of Environmental Control Officers (ECOs) is active at various construction sites across South Africa. While the expected role of ECOs is generally to ensure that environmental ... -
Degradation studies on acid-base blends for both LT and intermediate T fuel cells
(Elsevier, 2013)In this study the ex-situ and in-situ behavior of acid–base blend membranes from sulfonated polyethersulfone and a partially fluorinated sulfonated polymer (prepared by condensation of decafluorobipenyl with bisphenol ... -
Deliberate strategy and the tangible link to performance: lessons from South African higher education
(Academic Journals [©2011 Academic Journals], 2011)The notion of deliberate versus emergent strategy has long been debated. However, researchers have failed to show which method will bring about an increase in organisational performance, which is the bottom line for business ...