Browsing Faculty of Engineering by Title

Kalman Filter based RFID tag velocity estimation in the presence of frequency hopping

Bester, Nico-Paul; Hoffman, Alwyn (IEEE, 2019)

This paper compares different techniques for estimating the velocity of UHF RFID tags within practical applications. We use COTS RFID equipment complying with ISO18000-6C standards, including the use of frequency hopping, ...

Kernel bandwidth estimation for non-parametric density estimation: a comparative study

Van der Walt, Christiaan M.; Barnard, Etienne (Pattern recognition association of South Africa (PRASA), 2013)

We investigate the performance of conventional bandwidth estimators for non- parametric kernel density estimation on a number of representative pattern-recognition tasks, to gain a better understanding of the behaviour of ...

Kinetic evaluation of the hydroformylation of the post-metathesis product 7-tetradecene using a bulky phosphite-modified rhodium catalyst

Breckwoldt, Nicholas C.C.; Vosloo, Hermanus C.M.; Van der Gryp, Percy; Goosen, Neill J. (RSC, 2019)

The reaction engineering kinetics for the hydroformylation of the post-metathesis product 7-tetradecene using the bulky phosphite-modified rhodium catalyst Rh-tris(2,4-di-tertbutylphenyl)phosphite were evaluated. The ...

A kinetic expression for the pyrolytic decomposition of polyterafluoroethylene

Van der Walt, Izak J.; Neomagus, Hein W.J.P.; Bruinsma, O.S.L.; Nel, Johann T.; Crouse, Philippus L. (Elsevier, 2008)

Despite the fact that the thermal decomposition of polytetrafluoroethylene has been extensively studied over the past six decades, some inconsistencies regarding the kinetic parameters, e.g. the order of the reaction, ...

Kullback-Leibler divergence-based ASR training data selection

Gouvea, Evandro; Davel, Marelie H. (Interspeech 2011, 2011)

Data preparation and selection affects systems in a wide range of complexities. A system built for a resource-rich language may be so large as to include borrowed languages. A system built for a resource-scarce language ...

A laboratory scale fixed-bed coal conversion reactor. Part 1. Operation, reaction zone identification and industrial representativeness

Conradie, Frederik H.; Bunt, John R.; Neomagus, Hein W.J.P.; Waanders, Frans B.; Everson, Raymond C. (Elsevier, 2015)

Fixed bed coal gasification and combustion operations form an important part in the global energy supply, and these processes are characterized by complex interactions which are difficult to study on an industrial scale. ...

Landmine detection by means of ground penetrating radar: a model-based approach

Van Vuuren, P.A. (SAIEE, 2014)

The presence of landmines poses a worldwide humanitarian problem. Often, these mines are difficult to detect with metal detectors. Ground penetrating radar (GPR) is a promising technology for the detection of landmines ...

Landmine detection by means of ground penetrating radar: a rule-based approach

Van Vuuren, P.A. (SAIEE, 2014)

For a humanitarian landmine detection system to be of practical value it has to meet the following criteria: detection must be performed in real-time from a moving platform; plastic mines must be reliably detected; and ...

Language identification of individual words with joint sequence models

Giwa, Oluwapelumi; Davel, Marelie H. (Interspeech 2014, 2014)

Within a multilingual automatic speech recognition (ASR) system, knowledge of the language of origin of unknown words can improve pronunciation modelling accuracy. This is of particular importance for ASR systems required ...

Language Independent Search in MediaEval's Spoken Web Search Task

Metze, Florian; Anguera, Xavier; Barnard, Etienne; Gravier, Guillaume; Davel, Marelie H. (Elsevier Ltd., 2014)

In this paper, we describe several approaches to language-independent spoken term detection and compare their performanceon a common task, namely “Spoken Web Search”. The goal of this part of the MediaEval initiative is ...

Large-scale design and testing of an improved fine coal dewatering system

Le Roux, M.; Campbell, Q.P.; Smit, W. (SAIMM, 2012)

Fine coal (-500 μm) is notoriously difficult to dewater. It is not uncommon for a dewatered product to have a moisture content as high as 30 per cent after vacuum filtration. This poses several handling and financial ...

Leaching kinetics of bottom ash waste as a source of calcium ions

Koech, Lawrence; Everson, Ray; Neomagus, Hein; Rutto, Hilary (Taylor & Francis, 2015)

Bottom ash is a waste material from coal-fired power plants, and it is known to contain elements that are potentially toxic at high concentration levels when disposed in landfills. This study investigates the use of bottom ...

Leaching of rare earth elements from bentonite clay

Van der Watt, J.G.; Waanders, F.B. (The Southern African Institute of Mining and Metallurgy, 2012)

Due to increasing concerns of global rare earth element shortfalls in the near future, possible alternative sources of rare earth elements have recently become of economic interest. One such alternative is decanting ...

Lean implementation strategies: how are the Toyota Way principles addressed?

Coetzee, R.; Van der Merwe, K.; Van Dyk, L. (Stellenbosch Univ, 2016)

Lean manufacturing is widely considered to be a proven organisational improvement philosophy, yet the success rate of lean implementation in industry remains relatively low. Neglect of the human aspect of lean manufacturing ...

A life cycle model for the development of airborne electronic equipment

Viljoen, D.; Holm, J. (Univ Stellenbosch, 2017)

This paper describes a life cycle model for the development of electronic equipment for use on board military aircraft in the South African context. The life cycle model presented consolidates the activities of systems ...

Liminal presence of exo-microbes inoculating coconut endosperm waste to enhance black soldier fly larval protein and lipid

Hasnol, Sabrina; Ntwampe, Seteno K.O.; Lim, Jun Wei; Wong, Chung Yiin; Lam, Man Kee (Springer, 2020)

The anaerobic decomposition of coconut endosperm waste (CEW), residue derived from cooking, has been insidiously spewing greenhouse gasses. Thus, the bioconversion of CEW via in situ fermentation by exo-microbes from ...