Faculty of Engineering
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Code-switched English pronunciation modeling for Swahili spoken term detection
(Procedia Computer Science: Spoken Language Technology for Under-resourced Languages, 2016-05)We investigate modeling strategies for English code-switched words as found in a Swahili spoken term detection system. Code switching, where speakers switch language in a conversation, occurs frequently in multilingual ... -
The spoken web search task at MediaEval 2011
(Acoustics, Speech and Signal Processing (ICASSP), 2012-03)In this paper, we describe the “Spoken Web Search” Task, which was held as part of the 2011 MediaEval benchmark campaign. The purpose of this task was to perform audio search with audio input in five languages, with very ... -
Towards an initiative-based industry 4.0 maturity improvement process: master drilling as a case study
(Univ Stellenbosch, 2018)Industry 4.0 is an unavoidable global revolution with disruptive effects. Many sectors in South Africa are currently underprepared for the transformation that is necessary to stay competitive. An ever-present need therefore ... -
Simulating operational improvements on mine compressed air systems
(Univ Stellenbosch, 2018)Compressed air systems are one of the most significant energy users on mines, with a contribution of about 20 per cent to the total electrical energy consumption on a mine. Research has shown that these compressed air ... -
Warm-start heuristics for solving the passive optical network planning problem
(Univ Stellenbosch, 2018)The use of automated network planning systems is crucial for reducing the deployment cost and planning time of passive optical telecommunication networks. Mixed integer linear programming is well suited for the purpose of ... -
Impact of aggregation interval on harmonic phase angle measurements
(IEEE, 2018)The aggregation principles of IEC 61000-4-30 is a well-known concept implemented in Power Quality (PQ) recorders. Only rms data is retained. Harmonic emission assessment requires the analysis of harmonic phasors. Continuous ... -
On the remote calibration of voltage transformers: validation of opportunity
(IEEE, 2018)Remote calibration of instrument transformers seems possible if sufficient certainty in field measurements can be achieved. This opportunity, until now, was only investigated from a theoretical point of view and in this ... -
Measurement uncertainty of current harmonics during the assessment of compliance to grid code requirements
(IEEE, 2018)This paper improves the impact of measurement uncertainty on harmonic grid code compliance assessment by characterization of the current transformers at a renewable power producer. Field data was collected to evaluate the ... -
Failure modes in a carbon / titanium fibre metal laminate under hyper-velocity impact
(Elsevier, 2019)Titanium and carbon-fibre reinforced epoxy fibre metal laminates (FMLs) are investigated to determine their potential as a mass efficient passive armour for countering the threat of explosively formed projectiles (EFPs) ... -
Solar powered DC refrigerator with a monitoring and control system
(IEEE, 2018)Food, medicine and vaccine in developing countries are often difficult to preserve due to epileptic power supply from the utility companies. In other to reduce the over dependence on the utility company and harness the ... -
Novel measurement and verification of irrigation pumping energy conservation measures under incentive-based programmes
(ERC, UCT, 2018)In most countries the agricultural sector, especially crop irrigation, is a considerable energy consumer. Farm irrigation studies in South Africa showed that energy and water is wasted on a large scale and there is a large ... -
Combination of LiCs and EDLCs with batteries: a new paradigm of hybrid energy storage for application in EVS
(MDPI, 2018)The research presented in this paper proposes a hybrid energy storage system that combines both electrolytic double-layer capacitors (EDLCs) also known as supercapacitors (SCs) and lithium-ion capacitors (LiCs) also known ... -
Power quality grid code compliance for renewable power plants in South Africa
(IET, 2019)The introduction of renewable generation to South Africa's grid has introduced challenges to the management and regulation of power quality (PQ). These have been addressed by establishing PQ compliance criteria in line ... -
Power management and sizing optimisation of renewable energy hydrogen production systems
(Elsevier, 2019)This paper presents the combined sizing and power management optimisation methodology for a small-scale stand-alone hybrid renewable energy (RE) hydrogen production system. System cost is argued to be dependent on efficiency ... -
A numerical study to investigate the effect of inlet Reynolds number on the thermal-fluid phenomena in the supercritical carbon dioxide-cooled pebble bed reactor
(Springer, 2019)This paper presents a numerical investigation into thermal–fluid phenomena in a supercritical carbon dioxide-cooled pebble bed reactor (SCPBR) core under steady state using computational fluid dynamic. In this study, a ... -
Catalytic dehydrogenation of the liquid organic hydrogen carrier octahydroindole on Pt (111) surface: ab initio insights from density functional theory calculations
(Elsevier, 2019)Ab initio calculations based on dispersion-corrected density functional theory were used to gain insight into the adsorption properties of reactants and products involved in the catalytic dehydrogenation of octahydroindole ... -
In situ capturing and absorption of sulfur gases formed during thermal treatment of South African coals
(ACS, 2018)The objective of this study, the first of its kind on these specific South African low-sulfur coals, was to capture H2S and SO2 produced under inert and oxidizing conditions from sulfur compounds present in the coals. The ... -
Mineralogical, chemical, and petrographic properties of selected South African power stations’ feed coals and their corresponding density separated fractions using float-sink and reflux classification methods
(Taylor & Francis, 2018)Three South African feed coal samples for the combustion process were beneficiated to produce carbon-rich and mineral-rich fractions. The mineralogical, petrographical, and chemical properties of these feed coals and ... -
Analysing the porous structure of packed beds of spheres using a semi-analytical approach
(Elsevier, 2019)In this paper methodologies are described for the analysis of the porous structure of cylindrical and annular packed beds consisting of spheres when the coordinates and sizes of the spheres are known. Methodologies to ... -
Towards addressing respect for people during lean implementation
(Emerald, 2018)Purpose – The purpose of this study is to investigate, report and interpret the true, original meaning of the ToyotaWay Respect for People (RFP) principles as intended by their creators. Design/methodology/approach – The ...
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