Browsing Faculty of Natural and Agricultural Sciences by Title
Now showing items 2607-2626 of 4818
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Machine learning digital soil mapping to inform gully erosion mitigation measures in the Eastern Cape, South Africa
(Elsevier, 2020)Soil erosion is probably the most common form of land degradation, leading to on and off site detrimental effects, such as an increase in river sediment load which have been shown to drastically decrease dam storage capacity. ... -
Machine learning for radio frequency interference mitigation using polarization
(IEEE, 2017)Radio frequency interference (RFI) is electromagnetic interference (EMI) from signals in the radio frequencies of the electromagnetic spectrum. RFI reduces the sensitivity of radio telescope and produces artefacts in ... -
Macro and trace elements of 26 browse species growing in semi-arid grazing lands of Eastern Cape, South Africa
(National Inquiry Services Centre (NISC), 2017)Leaves and twigs from woody plants provide essential nutrients to range animals. We examined variation in the mineral status of 26 woody species, and the influence of harvesting height as well as the interactions of the ... -
Macrobenthic communities in selected river-dominated estuaries in KwaZulu-Natal, South Africa: effects of contrasting environmental variables and seasonal flow changes
(CERF, 2020)Globally, estuaries are ecologically important, but many are threatened by anthropogenic activities. Macrozoobenthos organisms are suitable ecological indicators in estuaries because they can detect the effects of stress ... -
Macrocyclic inhibitor for corrosion of N80 steel in 3.5% NaCl solution saturated with CO2
(Elsevier, 2016)The inhibition of the corrosion of N80 steel in 3.5 wt.% NaCl solution saturated with CO2 by the 1,2,4,7,9,10-hexaazacyclo-pentadeca-10,15-dien-3,5,6,8-tetraone (HPT) has been studied using Fourier transform infrared ... -
Macroinvertebrate variation in endorheic depression wetlands in North West and Mpumalanga provinces, South Africa
(Natl Inquiry Services Centre Pty Ltd, 2015)Aquatic macroinvertebrates are rarely used in wetland assessments due to their variation. However, in terms of biodiversity, these invertebrates form an important component of wetland fauna. Spatial and temporal variation of ... -
Magnesium intake predicts bone turnover in postmenopausal black South African women
(MDPI, 2019)This prospective study investigated the association between nutrient intake, dietary patterns, and changes in bone turnover and bone mineral density (BMD) in postmenopausal urban black South African women over two years. ... -
Magnetic field amplification and flat spectrum radio quasars
(Oxford University Press, 2014)We perform time-dependent, spatially resolved simulations of blazar emission to evaluate several flaring scenarios related to magnetic-field amplification and enhanced particle acceleration. The code explicitly accounts ... -
Magnetic field generation and particle energization at relativistic shear boundaries in collisionless electron-positron plasmas
(IOP Science, 2013)Using particle-in-cell simulations, we study the kinetic physics of relativistic shear flow in collisionless electron–positron (e+e−) plasmas. We find efficient magnetic field generation and particle energization at the ... -
Magnetogenesis in cyclical Universe
(IOP Publishing, 2018)We propose a simple solution to the magnetogenesis problem based on cyclic cosmology. It is demonstrated that magnetic fields, of sufficient strengths to account for the present observational bounds, can be created in ... -
Magnetospheric electric field variations caused by storm-time shock fronts
(Elsevier, 2008)On January 20, 2005 there was an X 7.1 solar flare at 0636 UT with an accompanied halo coronal mass ejection (CME). The resultant interplanetary shock impacted earth ∼36 h later. Near earth, the Advanced Composition Explorer ... -
Maize (Zea mays L.) performance in organically amended mine site soils
(Elsevier, 2016)Organic amendments play an important role in the eco-friendly remediation of degraded mine site soils. This study investigated the quality (essential nutrients and heavy metal content) of maize grown on organically amended ... -
Maize growth in response to cropping system, site and nitrogen fertilization
(National Agricultural Research and Development Institute, 2017)Maize is often grown on the same land year after year as sole crops and this result in lower yield from monocropped maize. An experiment was conducted to investigate the effects of cropping system, location and nitrogen ... -
The major and trace element chemistry of fish and lake water within major South African catchments
(Water Research Commission, 2016)Chemical elements in lake water are incorporated into fish tissues through bioconcentration and biomagnification. Lake water and fish tissue samples from 23 lakes, located within 4 major South African catchments, were ... -
Major secondary aerosol formation in southern African open biomass burning plumes
(Nature, 2018)Open biomass burning contributes significantly to air quality degradation and associated human health impacts over large areas. It is one of the largest sources of reactive trace gases and fine particles to Earth’s atmosphere ... -
Major weather regime changes over Southeast Asia in a near-term future scenario
(Inter-Research, 2017)A near-term future climate scenario over Southeast Asia is generated using a dynamical downscaling approach, and a process-level understanding of the regional climate change is developed by breaking down regional climate ... -
Making data structures and algorithms more understandable by programming sudoku the human way
(WASET, 2013)Data Structures and Algorithms is a module in most Computer Science or Information Technology curricula. It is one of the modules most students identify as being difficult. This paper demonstrates how programming a solution ... -
Making sense of significance in environmental impact assessment
(Taylor & Francis, 2016)Impact significance determination lies at the heart of environmental impact assessment (EIA) but conflict and misunderstanding around the concept is common. This paper attempts to make sense of impact significance in EIA ... -
Making use of survival analysis to indirectly model loss given default
(Stellenbosch Univ, 2018)A direct or indirect modelling methodology can be used to predict Loss Given Default (LGD). When using the indirect LGD methodology, two components exist, namely, the loss severity component and the probability component. ... -
Malaria control Insecticide Residues in Breast Milk: The Need to Consider Infant Health Risks
(PubMed Central, 2009)