Browsing Natural and Agricultural Sciences by Title
Now showing items 1-20 of 2172
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16SrRNA-based bacterial community profiling of Haemonchus contortus infecting Dohne Merino sheep using next generation sequencing
(North-West University (South Africa), 2019)Gastrointestinal parasitism causes major economic losses in most livestock species including small ruminants’ production throughout the world. The control of gastrointestinal nematode (GIN) parasites is mostly based on ... -
A 3D geological model for the East Rand Basin, South Africa
(North-West University, 2015)The primary aim of this dissertation is to map the geology of the East Rand Basin accurately by creating a 3D model. This was done by using borehole data from the National Groundwater Archive Geodatabase, which the Department ... -
An ab initio approach to modelling time-dependent cosmic-ray modulation in the heliosphere
(North-West University (South Africa), 2020)The ab initio approach to cosmic ray modulation places a strong, primary emphasis on understanding the basic causes of cosmic-ray modulation. This requires knowledge and an understanding of both the large and small-scale ... -
An ab initio approach to the heliospheric modulation of galactic cosmic rays
(North-West University, 2006)In the present study we aim to further our understanding of charged particle transport in a magnetized medium. To this end, we perform direct numerical simulations of particle transport in a turbulent magnetic field. From ... -
An ab initio approach to the historical modulation of cosmic rays
(North-West University (South Africa), 2021)The relationship between observed cosmic-ray intensities and the heliospheric magnetic field during the early space age is generally considered to be anomalous, relative to their relationship observed at later times. ... -
Absorption and Quantum Chemical studies on some DYES as Corrosion Inhibitors on Mild Steel in Acidic Medium
(North-West University, 2014)The corrosion inhibition of some selected dyes namely Sunset yellow (SS). Amaranth (AM). Allura red (AR). Tartrazine(TZ) and Fast green (FG) on mild steel in 0.5M HCI was studied at 30-60°C using weight loss, electrochernical ... -
The abundance, identity and population dynamics of Meloidogyne spp. associated with maize in South Africa
(North-West University (South Africa), 2018)Maize, a staple food in sub-Saharan countries, is also an important livestock feed source in many parts of the world. Plant-parasitic nematodes cause estimated yield losses of 12 % upwards in local maize fields. Although ... -
Accelerated life testing using the Eyring model for the Weibull and Birnbaum- Saunders distributions
(North-West University (South Africa), 2021)In this thesis, we present a novel approach to new Bayesian dual-stress accelerated life testing models. The generalised Eyring model, with one thermal stressor and one non-thermal stressor, is utilised as the time ... -
Acceleration of cosmic rays in the outer heliosphere
(North-West University (South Africa), Potchefstroom Campus, 2016)Shortly before the Voyager spacecraft crossed the heliospheric termination shock, they encountered narrow, peak-like enhancements in the intensities of low-energy electrons. These enhancements were associated at the time ... -
Actinomycetes impacts on drought stress in maize (Zea Mays L.)
(North-West University (South Africa), 2018)Drought is a major cause of the present decrease in crop yield and agricultural productivity, accounting for the recent worldwide shortage in food availability. Drought results from the current change in climate conditions. ... -
Adaptation of trees to the urban environment : Acacia karroo in Potchefstroom, South Africa
(North-West University, 2006)Urban open spaces are of strategic importance to the quality of life of our increasingly urbanized society. Trees and related vegetation are planted and managed within the communities and cities to create or add value ... -
Addressing critical water and waste issues in Environmental Impact Assessment (EIA) : the case of coal mining in South Africa
(North-West University, 2018)Internationally, the assessment of mining related impacts has been a particular focus of environmental impact assessment (EIA) research and practice, with a wealth of literature on the subject. In light of the significant ... -
Addressing social issues in rural communities by planning for lively places and green spaces
(2014)The increase in social challenges especially with regards to safety and security experienced in rural communities, as well as the lack of efficient lively places and public green spaces, is predominantly increasing in ... -
Adolescents' perceptions of physical activity for the enhancement of health : a systematic review
(North-West University, 2012)Adolescents are usually considered to be in good health, but their wellbeing tend to decrease from primary school to high school. When youth participate in at least 60 min of physical activity every day several health ... -
Adoption of Sustainable Development Goals (SDG) implementation targets by South African companies
(North-West University (South Africa), 2021)Sustainable development is defined as "development that meets the needs of the present without compromising the ability of future generations to meet their own needs" (Brundtland, 1987). In 2015 a suite of seventeen ... -
Die adsorpsie van atrasien deur verskillende kleiminerale en die invloed daarvan op die mobiliteit van atrasien
(Potchefstroom University for Christian Higher Education, 1993)Atrazine (2-chloro-4-ethylamino-6-isopropylamino-1,3,5-triazine)is a pre-emergence herbicide used mainly on maize. The influence of various clay minerals, i.e. illite-vermiculite mixtures, montmorillonite, kaolinite, ... -
Adsorption, thermodynamic and density functional theory investigation of some sulphonamides as corrosion inhibitors for some selected metals in acidic medium
(North-West University, 2015)In this thesis, nine sulphonamides derivatives namely, sulphanilamide (SNA), sulphamethoxazole (SMX), sulphadimethoxine (SDM), sulphisoxazole (SSZ), sulphamethazine (SMT), sulphachloropyridazine (SCP), sulphabenzamide ... -
Adsorption, thermodynamic and quantum chemical studies of some ionic liquids as corrosion inhibitors for mild steel in HCl
(North-West University, 2014) -
Advanced natural language processing for improved prosody in text–to–speech synthesis
(North-West University, 2014)Text-to-speech synthesis enables the speech-impeded user of an augmentative and alternative communication system to partake in any conversation on any topic, because it can produce dynamic content. Current synthetic voices ... -
Advances in Risk Based Investing by means of Quantile Regression
(North-West University (South Africa), 2021)This thesis advances the relatively open-field of risk-based investing using methods available through quantile regression. To explain the complex relationship between different assets, practitioners and academics alike, ...
