Now showing items 696-705 of 705

    • Water-only laboratory coal fractionation using the reflux classifier 

      Campbell, Q.P.; Le Roux, M.; Smith, I.G.T. (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 

      Rens, Johan; Van Rooyen, Tian; De Jager, Francois (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 ...
    • White space and digital dividends: the case for dynamic spectrum access in South Africa 

      Ferreira, Melvin; Helberg, Albert (IEEE, 2011)
      In this paper we present the current state of affairs surrounding the analog switch-off and corresponding digital dividend as pertaining to South Africa. Analog switch-off and digital dividends has enjoyed much attention ...
    • Wing-body circulation control by means of a fuselage trailing edge 

      Huyssen, R.J.; Spedding, G.R.; Mathews, E.H.; Liebenberg, L. (American Institute of Aeronautics & Astronatics, 2012)
      Ideal flight sheds the least amount of kinetic energy into a wake while imparting momentum sufficient to balance the vehicle weight. This combination defines a unique downwash distribution for the wake, which an aircraft ...
    • A wireless sensor network testbed for the evaluation of energy-aware routing schemes 

      Grobler, Magdalena J.; Marais, Henri-Jean; Krige, Joubert G. J. (Hindawi, 2014)
      Wireless sensor networks (WSNs) are receiving a lot of research attention due to continual improvement in the technologies used by these networks. The energy efficiency of sensor nodes and the network as a whole is of ...
    • Woefzela - an open-source platform for ASR data collection in the developing world 

      de Vries, Nic J.; Badenhorst, Jaco; Davel, Marelie H.; Barnard, Etienne; de Waal, Alta (Interspeech 2011, 2011)
      Building transcribed speech corpora for under-resourced languages plays a pivotal role in developing speech technologies for such languages. We have developed an open-source tool for devices running the Android operating ...
    • Wolof Speech Recognition Model of Digits and Limited-Vocabulary Based on HMM and ToolKit 

      Tamgno, James K.; Barnard, Etienne; Lishou, Claude; Richomme, Morgan (Computer Modelling and Simulation (UKSim), 2012 UKSim 14th International Conference on, 2012)
      This paper is concerned with Automatic Speech Recognition (ASR) using trainable systems. The aim of this work is to build acoustic models for spoken language Wolof. This is done by employing Hidden Markov Models (HMM) and ...
    • X-ray diffraction parameters and reaction rate modeling for gasification and combustion of chars derived from inertinite-rich coals 

      Everson, Raymond C.; Okolo, Gregory N.; Neomagus, Hein W.J.P.; Dos Santos, Jaen-Mari (ELSEVIER, 2013)
      An investigation was undertaken to determine the effect of carbon structural properties on the reactivity of chars derived from inertinite-rich coal. The structures of chars were characterized by X-ray diffraction and ...
    • μ-Analysis applied to self-sensing active magnetic bearings 

      Van Schoor, George; Van Vuuren, Pieter Andries (SAIEE Publications, 2011)
      The stability margin of a two degree-of-freedom self-sensing active magnetic bearing (AMB) is estimated by means of ?-analysis. The specific self-sensing algorithm implemented in this study is the direct current measurement ...
    • μ-Analysis applied to self-sensing active magnetic bearings 

      Van Vuuren, P.A.; Van Schoor, G. (SAIEEE, 2011)
      The stability margin of a two degree-of-freedom self-sensing active magnetic bearing (AMB) is estimated by means of μ -analysis. The specific self-sensing algorithm implemented in this study is the direct current ...