Now showing items 497-516 of 799

    • Modelling the stellar soft-photon energy density of globular clusters 

      Prinsloo, Phillip L.; Venter, Christo; Busching, Ingo; Kopp, Andreas (South African Institute of Physics, 2014)
      Recent observations by e.g. Fermi LAT and H.E.S.S. have revealed globular clusters to be sources of high-energy and very-high-energy gamma rays. It has been suggested that the presence of large numbers of millisecond pulsars ...
    • Modelling the y-ray and radio light curves of the double pulsar system 

      Seyffert, A.S.; Venter, C.; Harding, A.K.; Johnson, T.J. (South African Institute of Physics, 2014)
      Guillemot et al. recently reported the discovery [1] of -ray pulsations from the 22.7 ms pulsar (pulsar A) in the famous double pulsar system J0737−3039A/B. The -ray light curve (LC) of pulsar A has two peaks separated ...
    • Modernising underground compressed air DSM projects to reduce operating costs 

      Kriel, C.J.R.; Marais, J.H.; Kleingeld, M. (IEEE, 2014)
      Compressed air is an energy intensive utility that is frequently used in the deep level mining industry. Most compressed air networks are designed to ensure ample compressed air supply to consumers. This has created the ...
    • Modified earliest decoding for random network codes 

      Von Solms, Suné; Helberg, Albert S.J. (IEEE, 2011)
      We present a practical, modified version of earliest decoding for random linear network coding networks. This decoding method has a lower complexity and decoding delay than traditional Gaussian elimination decoding schemes
    • Monitoring gearbox oil viscosity by means of motor current signal analysis 

      Van Vuuren, Pieter A.; Xu, Yuandong; Gu, Fengshou; Ball, Andrew D. (Univ of Huddersfield, 2017)
      A number of gearbox failures can be attributed to lubricant related problems. One measure of the condition of gearbox oil is its viscosity. In electrically powered systems, motor current signal analysis allows online ...
    • Monitoring of the FSRQ PKS 1510-089 with H.E.S.S. 

      Zacharias, Michael; Jankowsky, Felix; Mohamed, Mahmoud; Prokoph, Heike; Sanchez, David (PoS, 2017)
      The flat spectrum radio quasar (FSRQ) PKS 1510-089 (z=0.361) is known for its complex multiwavelength behavior. It has been monitored regularly at very high energy (VHE, E > 100GeV) gamma-rays with H.E.S.S. since its ...
    • Monomers, polymers and cross-linked membranes for membrane fuel cells and electrolysis 

      Kerres, Jochen A.; Krüger, Andries; Schoeman, Hannes; Bessarabov, Dmitri; Krieg, Henning (Electrochemical Society, 2011)
      This contribution comprises an overview about work in the development of ionomers/ionomer (blend) membranes for fuel cells. The topics include the development of novel sulfonated monomers and homo- and copolymers; the ...
    • Moving households to cleaner energy through air quality offsets 

      Langerman, Kristy E.; Piketh, Stuart J.; Pauw, Christiaan J.; Smith, Hendrik J. (IEEE, 2018)
      Highest levels of exposure to polluted air in South Africa occur in low-income settlements where households burn solid fuels. The Department of Environmental Affairs has recently developed a legally enforceable mechanism ...
    • MSP binaries as astrophysical laboratories 

      Wadiasingh, Zorawar; Venter, Christo; Böttcher, Markus; Harding, Alice K.; Baring, Matthew G. (Cambridge Univ Press, 2018)
      Follow-up of unidentified Fermi sources has expanded the number of known galactic-field “black widow” and “redback” millisecond pulsar binaries from four to nearly 30. Several systems observed by Chandra, XMM-Newton, Suzaku, ...
    • Multi-wavelength observations of flaring blazars with ATOM and Fermi-LAT 

      Jankowsky, Felix; Böttcher, Markus; Zacharias, Michael; Wagner, Stefan J.; Kurtanidze, Omar (Sissa Medialab, 2017)
      The Automatic Telescope for Optical Monitoring is a 75cm optical telescope located at the H.E.S.S. site in Namibia. Since 2005, it monitors around 250 gamma-ray emitting AGN and has observed numerous blazar flares in several ...
    • Multifaceted nanominerals and ultrafine particles in phosphogypsum: a by-product of coal cleaning rejects 

      De Leão, Felipe B.; Waanders, F.; Taffarel, S.; Sampaio, C.; Lima, B. (International Pittsburgh Coal Conference, 2016)
    • Multilingual pronunciations of proper names in a Southern African corpus 

      Jan W.F. Thirion; Etienne Barnard; Davel, Marelie H. (Pattern recognition association of South Africa (PRASA), 2012)
      We present our process for the development and analysis of a multilingual names corpus, called Multipron-split. It is derived from Multipron, a corpus collected in previous work [1], where names and speakers were drawn ...
    • Multivariable H∞ control for an active magnetic bearing flywheel system 

      Steyn, S.J.M.; Van Vuuren, P.A.; Van Schoor, G. (IET, 2010)
      A state-space model with uncertainties for an active magnetic bearing energy storage flywheel system (Fly-UPS) is developed. A multivariable robust H∞ controller for the Fly-UPS is then synthesised. Different weighting ...
    • Multiwavelength analysis of four millisecond pulsars 

      Guillemot, L.; Venter, C.; Cognard, I.; Johnson, T.J.; Harding, A.K.; Fermi LAT (AIPC, 2011)
      Radio timing observations of millisecond pulsars (MSPs) in support of Fermi LAT observations of the gamma-ray sky enhance the sensitivity of high-energy pulsation searches. With contemporaneous ephemerides we have detected ...
    • Multiwavelength modeling of the globular cluster Terzan 5 

      Büsching, I.; Venter, C.; Kopp, A.; De Jager, O.C.; Clapson, A.C. (ICRC, 2011)
      Diffuse X-ray emission has recently been detected from the globular cluster (GC) Terzan 5, extending out to ~2.5' from the cluster centre. This emission may arise from synchrotron radiation (SR) by energetic leptons being ...
    • Multiwavelength polarization as a diagnostic of blazar physics 

      Böttcher, Markus; Zhang, Haocheng; Chen, Xuhui (Sissa Medialab, 2015)
      The nature of the high-energy emission in jet-dominated AGN (especially blazars) as well as the location and mode of acceleration of particles to ultra- relativistic energies are a matter of intensive debate. Both leptonic ...
    • Multiwavelength signatures of shocks in relativistic jets 

      Böttcher, Markus; Baring, Matthew G.; Summerlin, Errol J. (HEASA, 2016)
      Mildly relativistic, oblique shocks are frequently invoked as possible sites of relativistic particle acceleration and production of strongly variable, polarized multi-wavelength emission from relativistic jet sources ...
    • Municipal resources for enhancing communication and Information services 

      Tshibalo, N.L.; Mzini, L.B. (SAAPAM, 2014)
      This paper examines the norms and standards for using municipal resources. Managing resources forms part of internal procedures. the paper specifically analysis the strategies implemented for upholding municipal employees ...
    • The mutualistic relationship between information systems and the humanities 

      Kroeze, Jan H. (IBIMA, 2010)
      The paper explores the nature of the relationship between the study fields of Information Systems and the humanities. Although literature on Humanities Computing states in principle that there is a bidirectional, beneficial ...