Browsing Faculty of Engineering by Title
Now showing items 1101-1120 of 1129
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Validating smartphone-collected speech corpora
(SLTU, 2012)We investigate the effectiveness with which the accuracy of a prompted speech corpus can be validated when minimal additional speech resources are available, and specifically when a language model in the target language ... -
Validation of a transient thermal-fluid systems CFD model for a packed bed high temperature gas-cooled nuclear reactor
(Elsevier, 2006)This paper provides an overview of the theoretical basis for a new thermal-fluid systems CFD simulation model for high temperature gas-cooled reactors, contained in the Flownex software code. Flownex provides for detailed ... -
The validation of single point measurements for the localization of multiple harmonic sources
(IEEE, 2010)Power quality management requires inexpensive and simple methods for electric power quality monitoring. This paper investigates the validity of single point measurements for the localization of sources of waveform distortion ... -
Validation of using a modified BET model to predict the moisture adsorption behavior of bituminous coal
(Taylor & Francis, 2016)A good correlation exists between the amount of moisture adsorbed and the oxygen content of medium-rank B vitrinite-rich and medium-rank C inertinite-rich bituminous coal. Total mass moisture adsorbed per gram of coal ... -
Valorisation of waste lignin for phenol derivative compounds using hydrothermal liquefaction
(EUBCE, 2019)Approximately 95% of global phenolic compounds (such as catechol, guaiacol, syringol, and vanillin) used in the pharmaceutical, fragrance and industrial industries are produced from petroleum-based phenolics such as benzene. ... -
Variable kernel density estimation in high-dimensional feature spaces
(Association for the Advancement of Artificial Intelligence, 2017)Estimating the joint probability density function of a dataset is a central task in many machine learning applications. In this work we address the fundamental problem of kernel bandwidth estimation for variable kernel ... -
Variable selection in logistic regression models through the application of exact mathematical programming
(SASA, 2020)A linearised approximation of the log-likelihood objective function is presented as a potential alternative to iterative fitting methods employed by logistic regression. The log-likelihood objective function is solved using ... -
Variance-based sensitivity of localized sulphation to microporous separator properties using a distributed parameter model of a valve-regulated lead-acid battery
(Electrochemical Society, 2016)Progressive sulphation of the negative electrode in a lead-acid battery under high-rate operation remains a serious problem. This study investigates how healthier end-of-discharge conditions, in a valve-regulated lead-acid ... -
Verifying the cooling capacity and power consumption of thermoelectric cooling holders for vaccine storage
(IEEE, 2015)The purpose of this paper is to verify the power consumption of different topologies of cooling system for the storage of vaccine in a portable solar powered vaccine carrier box for the domestic use in South Africa. The ... -
A versatile energy management system for large integrated cooling systems
(Elsevier, 2013)Large, energy intensive cooling systems are found on deep level mines to supply chilled service water and cool ventilation air to the mine. The need exists for a simple, real-time energy management tool for large, integrated ... -
Viscosity predictions of the slag composition of gasified coal, utilizing FactSage equilibrium modelling
(Elsevier, 2009)Agglomeration of ash particles provides the desired porosity of the ash bed for adequate agent (steam and oxygen) flow and distribution, whereas excessive slagging inside the gasifier can cause channel burning, pressure ... -
Visible light-excitable ZnO/2D graphitic-C3N4 heterostructure for the photodegradation of naphthalene
(Balaban Publishers, 2019)In this study, ZnO/g-C3 N4 heterostructure was synthesized with enhanced photodegradation potential for polycyclic aromatic hydrocarbons (PAHs) (viz. naphthalene) in water using visible light. The as-prepared catalysts ... -
A vision of energy-based visualisation of large scale industrial systems for the purposes of condition monitoring
(NWU, 2018)Most large scale industrial systems can be viewed as processes that convert energy from one form to another. Energy is a universal quality of which the distribution holds meaning across physical domains i.e. thermal-flu ... -
Visualizing data in high-dimensional spaces
(Pattern Recognition Association of South Africa and Mechatronics International Conference, 2010)A novel approach to the analysis of feature spaces in statistical pattern recognition is described. This approach starts with linear dimensionality reduction, followed by the computation of selected sections through and ... -
A voice service for user feedback on school meals
(ACM, 2012)Research using voice-based services as a technology platform for providing information access and services within developing world regions has shown much promise. The results for design and deployment of such voice-based ... -
Volatile trace element behaviour in the Sasol® fixed-bed dry-bottom (FBDB)™ gasifier treating coals of different rank
(Elsevier, 2011)Trace element simulation and validation of model predictions for the elements Hg, As, Se, Cd and Pb have recently been undertaken for the Sasol® FBDB™ gasification process operating on lump coal. The validation was conducted ... -
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 ... -
Waste butter and margarine as feedstock for biodiesel production
(ETA-Florence Renewable Energies, 2012)The resulting bio-waste from butter and margarine factories should be disposed of in an environmentally friendly manner. Currently the bio-waste is either flushed into the municipal sewerage system or moved to landfill ... -
Water-only laboratory coal fractionation using the reflux classifier
(Elsevier, 2015)Due to health and environmental factors involved with standard float-sink analytical methods, a water-only fractionation procedure was investigated. A laboratory scale 105 × 105 mm reflux classifier was built and used to ... -
Where is the power of the IEEE 1459-2010?
(IEEE, 2014)The integration of the IEEE 1459-2010 power definitions with the IEC 61000-4-30 PQ standard is investigated. A Class A PQ instrument, which record network coherent data with an absolute time uncertainty of less than 100 ...
