Now showing items 693-698 of 698

    • Warm-start heuristics for solving the passive optical network planning problem 

      Luies, Ruan; Terblanche, Stephanus; Grobler, Magdalena (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 

      Schabort, C.J.; Visser, H.P.; Hartzenberg, A.; Venter, R.; Marx, S. (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 ...
    • What can we learn from phase alignment of γ-ray and radio pulsar light curves? 

      Venter, C.; Johnson, T.J.; Harding, A.K. (SAIP, 2011)
      The Fermi Large Area Telescope (LAT) has revolutionized high-energy (HE) astronomy, and is making enormous contributions particularly to γ-ray pulsar science. As a result of the many new pulsar discoveries, the γ-ray pulsar ...
    • 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 ...
    • Why the universe is unexpectedly transparent to very high energy gamma rays 

      Abdalla, Hassan; Böttcher, Markus (Sissa Medialab, 2017)
      Recent observations of distant gamma ray sources indicate that the universe may be more transparent to VHE-gamma-rays than expected. In this paper we study the reduction of the EBL gamma-gamma opacity due to the existence ...