Browsing Faculty of Natural and Agricultural Sciences by Title
Now showing items 1506-1525 of 4825
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Emissions management and health exposure: should all power stations be treated equal?
(Springer, 2017)At the centre of all air quality regulation stands the right of humans to an environment that is not harmful to health and well-being. In many developing countries, including South Africa, coal-fired power station emissions ... -
The emperor's new clothes - Reflections on strategic environmental assessment (SEA) practice in South Africa
(Elsevier Science Limited, 2008) -
An empirical assessment of factors impeding effective password management
(Taylor & Francis, 2009)Since passwords are one of the main mechanisms used to protect data and information, it is important to ensure that passwords are managed correctly and that those factors which will have a significant impact on password ... -
Empirical constraints on the general relativistic electric field associated with PSR J0437-4715
(IOP Publishing, 2005)We simulate the magnetosphere of the nearby millisecond pulsar PSR J0437-4715, which is expected to have an unscreened electric potential due to the lack of magnetic pair production. We incorporate general relativistic ... -
An empirical exploration of the capabilities of people with disabilities in coping with disasters
(Springer, 2020)While the capability approach is increasingly being adopted for evaluating well-being and social justice in the field of human development, this approach in disaster research has remained scarce. This research thus seeks ... -
An empirical investigation of alternative semi-supervised segmentation methodologies
(ASSAf, 2019)Segmentation of data for the purpose of enhancing predictive modelling is a well-established practice in the banking industry. Unsupervised and supervised approaches are the two main types of segmentation and examples of ... -
Empirical investigation of systems cost estimation models in the Limpopo Province of South Africa: a requirement modelling problem
(CSREA, 2014)There are many factors believed to be important to systems development cost estimation. However an in-depth analysis demonstrates requirements as central cost drivers. The various transformations requirements go through ... -
An empirical test of the impact of drying events and physical disturbance on wind erosion of zooplankton egg banks in temporary ponds
(Springer, 2020)Most temporary pond zooplankton species produce drought-resistant eggs that accumulate in the sediment and form an egg bank. When a pond dries and the egg bank is exposed, wind erodes eggs and wind action has been suggested ... -
Employee well-being, intention to leave and perceived employability: a psychological contract approach
(AOSIS, 2015)Employability emerged as a "new psychological contract" that may have beneficial effects on both individual and organisational outcomes. The study set out to investigate the relationship between perceived employability and ... -
Enabling green and blue infrastructure to improve contributions to human well-being and equity in urban systems
(Oxford Univ Press, 2019)The circumstances under which different ecosystem service benefits can be realized differ. The benefits tend to be coproduced and to be enabled by multiple interacting social, ecological, and technological factors, which ... -
The enchytraeid reproduction test (ERT): a potentially quick and affordable tool for the assessment of metal contaminated soils in emerging economies
(Springer Verlag, 2013)The enchytraeid reproduction test (ERT) was used to assess the ecotoxicity of selected mine tailings and agricultural soils from South Africa. The mine tailings had higher cumulative metal concentrations than ... -
Endocrine disruptors and health effects in Africa: a call for action
(NIEHS, 2017)Background: Africa faces a number of unique environmental challenges. Unfortunately, it lacks the infrastructure needed to support the comprehensive environmental studies that could provide the scientific basis to inform ... -
Endophytic colonization of Vicia faba and Phaseolus vulgaris (Fabaceae) by fungal pathogens and their effects on the lifehistory parameters of Liriomyza huidobrensis (Diptera: Agromyzidae)
(ELSEVIER, 2013)Ten fungal isolates belonging to the genera Beauveria (3), Hypocrea (1), Gibberella (1), Metarhizium (2), Trichoderma (1) and Fusarium (2) were evaluated in the laboratory to determine whether they could become endophytic ... -
Energy intake and energy expenditure of preprofessional female contemporary dancers
(PLoS, 2017)Many athletes in aesthetic and weight dependent sports are at risk of energy imbalance. However little is known about the exercise and eating behaviours of highly trained dance populations. This investigation sought to ... -
Energy loss in intergalactic pair beams: particle-in-cell simulation
(EDP Sciences, 2016)Aims. The change in the distribution function of electron-positron pair beams determines whether GeV photons can be produced as secondary radiation from TeV photons. We will discuss the instabilities driven by pair ... -
Energy policy, air quality, and climate mitigation in South Africa: the case for integrated assessment
(Springer, 2018)Background and significance: South Africa reports approximately 20,000 premature deaths due to air pollution annually. Policy in South Africa has typically addressed greenhouse gas emissions, energy supply, and air quality ... -
Energy spectra of carbon and oxygen with HELIOS E6: radial gradients of anomalous cosmic ray oxygen within 1 AU
(EDP Sciences, 2018)Context. Anomalous cosmic rays (ACRs) are well-suited to probe the transport conditions of cosmic rays in the inner heliosphere.We revisit the HELIOS data not only in view of the upcoming Solar Orbiter experiment but also ... -
Energy spectrum of cosmic-ray electrons at TeV energies
(APS, 2008)The very large collection area of ground-based γ-ray telescopes gives them a substantial advantage over balloon or satellite based instruments in the detection of very-high-energy (>600 GeV) cosmic-ray electrons. Here we ... -
Engineering and expression of a human rotavirus candidate vaccine in Nicotiana benthamiana
(BioMed Central, 2015)Background: Human rotaviruses are the main cause of severe gastroenteritis in children and are responsible for over 500 000 deaths annually. There are two live rotavirus vaccines currently available, one based on ... -
Engineering semantic web services for government business processes automation
(Springer, 2015)Web Services (WS) technology does not allow automatic discovery and execution of services in the current distributed and complex business environments. Semantic Web Services (SWS) overcome this limitation by adding semantic ...