Recent Submissions

  • Evidence-informed decision making for nutrition: African experiences and way forward 

    Aryeetey, Richmond; Taljaard, Christine; Holdsworth, Michelle; Hounkpatin, Waliou Amoussa; Colecraft, Esi (Cambridge Univ Press, 2017)
    Although substantial amount of nutrition research is conducted in Africa, the research agenda is mainly donor-driven. There is a clear need for a revised research agenda in Africa which is both driven by and responding to ...
  • Students’ learning approaches: are they changing? 

    Taylor, Estelle; Van Aswegen, Kobus (Springer, 2017)
    ome researchers believe that not much has changed in terms of how students prefer to study, whilst others believe that tertiary institutions have to adapt to a new generation of students. The aim of this paper is to determine ...
  • A practical approach to managing uncertainty in the measurement and verification of energy efficiency savings 

    Hamer, W.; Booysen, W.; Mathews, E.H. (Univ Stellenbosch, 2017)
    Measurement and verification (M&V) is fundamental in determining the impact of energy efficiency (EE) interventions. However, accurately quantifying the EE savings on complex industrial systems can present several ...
  • Automated electricity bill analysis in South Africa 

    Goosen, P.; Mathews, M.J.; Vosll, J.C. (Univ Stellenbosch, 2017)
    The ever-increasing cost of energy puts industries under pressure. Industries are forced to monitor their energy consumption and to manage energy more efficiently and responsibly. Some industrial companies have multiple ...
  • Evaluating the feasibility of the 12L tax incentive for energy-intensive industries 

    Campbell, K.; Booysen, W.; Vosloo, J.C. (Univ Stellenbosch, 2017)
    Section 12L of the South African Income Tax Act (12L) aims to incentivise businesses to become more energy-efficient. However, claiming this benefit is a complex process that can become difficult, time-consuming, and costly ...
  • Skoolhoofleierskapstyl deur die lens van die kultuurhistoriese aktiwiteitsteorie (KHAT) 

    Van Jaarsveld, Magdalena Christina; Mentz, Paulus Jacobus; Ellis, Susanna Maria (Suid-Afrikaanse Akademie vir Wetenskap en Kuns, 2017)
    Followers' perceptions are the best evaluation of leadership styles. How followers observe a leadership style may differ from how the leader sees it. In order to understand the entire reality, one should accept and respect ...
  • Short-term variation in the galactic cosmic ray intensity measured with the PAMELA experiment 

    Munini, Riccardo; Potgieter, M.S.; Di Felice, Valeria; Boezio, M.; Adriani, O. (PoS, 2017)
    New results on the galactic cosmic ray (GCR) short-term intensity variation associated with Forbush decrease and co-rotating interaction regions (CIRs) measured by the PAMELA instrument between November 2006 and March ...
  • Ten years of positron and electron solar modulation measured by the PAMELA experiment 

    Munini, Riccardo; Potgieter, M.S.; Raath, J.L.; De Felice, V.; Boezio, M. (PoS, 2017)
    The satellite-borne PAMELA experiment was launched on the 15th June 2006 from the Baikonur cosmodrome. Till January 2016 PAMELA has detected the charged component of cosmic-rays (CRs) over a wide energy range. Due to its ...
  • Target of opportunity observations of blazars with H.E.S.S. 

    Schüssler, F.; Böttcher, M.; Davids, I.D.; Zacharias, M.; Seglar-Arroyo, M. (PoS, 2017)
    The very-high-energy (VHE, E>100 GeV) extragalactic sky is dominated by blazars, a class of active galactic nuclei which show rapid variability at all wavelengths. Target of Opportunity (ToO) observations triggered by ...
  • GRB observations with H.E.S.S. II 

    Hoischen, Clemens; Garrigoux, Tania; Balzer, Arnim; Bissaldi, Elisabetta; Füssling, Matthias (PoS, 2017)
    The High Energy Stereoscopic System (H.E.S.S.) has been searching for counterparts of Gamma Ray Bursts (GRBs) for many years. In 2012 the system was upgraded with a fifth 28m diameter telescope (CT5) which is equipped ...
  • Challenges in reconciling observations and theory of the brightest high-energy flare ever of 3C 279 

    Bottacini, Eugenio; Böttcher, Markus; Pian, Elena; Collmar, Werner; Gasparrini, Dario (PoS, 2017)
    Recent high-energy missions have allowed keeping watch over blazars in flaring states, which provide deep insights into the engine powered by supermassive black holes. However, having a quasar caught in a very bright ...
  • Observation of the extremely bright flare of the FSRQ 3C279 with H.E.S.S. II 

    Romoli, C.; Zacharias, M.; Meyer, M.; Ait Benkhali, F.; Jacholkowska, A. (PoS, 2017)
    In June 2015, the Flat Spectrum Radio Quasar 3C 279 underwent an extremely bright gamma-ray flare, with an increase of the flux above 100 MeV by a factor 10 in less than 1 day, revealing an intrinsic variability timescale ...
  • The exceptional VHE gamma-ray outburst of PKS 1510-089 in May 2016 

    Zacharias, Michael; Sitarek, Julian; Prester, Dijana Dominis; Jankowsky, Felix; Lindfors, Elina (PoS, 2017)
    PKS 1510-089 (z=0.361) is one of only a handful of flat spectrum radio quasars that have been detected at very high energy (VHE, E > 100GeV) gamma rays. It is a very active source across the entire electromagnetic spectrum. ...
  • 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 ...
  • High-energy emission properties of pulsars 

    Venter, Christo; Harding, Alice K.; Grenier, Isabelle (PoS, 2017)
    The sheer number of new γ-ray pulsar discoveries by the Fermi Large Area Telescope since 2008, combined with the quality of new multi-frequency data, has caused a revolution in the field of high-energy rotation-powered ...
  • Solar modulation of cosmic ray positrons in a very quiet heliosphere 

    Potgieter, Marius S.; Vos, Etienne E.; Bisschoff, Driaan; Raath, Jan-Louis; Boezio, Mirko (PoS, 2017)
    Since the beginning of the space exploration era, solar activity was observed at its lowest level during 2006 to 2009. During this period, the PAMELA space experiment observed spectra for galactic cosmic rays, specifically ...
  • The combined modulation of Jovian and Galactic electrons in the heliosphere 

    Potgieter, Marius S.; Nndanganeni, Rendani R. (PoS, 2017)
    The propagation and modulation of electrons in the heliosphere play a significant role in improving our understanding and assessment of the competing processes of solar modulation. An in-house developed, full three-dimensional ...
  • Charge-sign dependent modulation of cosmic ray electrons and positrons up to extreme solar maximum conditions 

    Raath, J.L.; Potgieter, M.S. (PoS, 2017)
    The charge-sign dependent modulation of cosmic rays is an important topic in solar modulation studies, providing insights into gradient, curvature, and current sheet drifts. Such studies, at higher levels of solar activity, ...
  • Acceleration of galactic electrons at the solar wind termination shock and Voyager 1 observations 

    Potgieter, Marius S.; Prinsloo, P. Lourens; Strauss, R. Du Toit (PoS, 2017)
    Diffusive shock acceleration (DSA) , as an acceleration process for G alactic electrons at the solar wind termination shock (TS) , is investigated with a comprehensive numerical model which ...
  • Dc-bus voltage balancing controllers for split dc-link four-wire inverters and their impact on the quality of the injected currents 

    Bozalakov, Dimitar; Rens, Johan; Meersman, Bart; Bottenberg, Agknaton; Desmet, Jan (IET, 2017)
    The increasing share of single-phase distributed generation units in low-voltage grids causes voltage unbalance problems and overvoltages. Therefore, the need for power quality improving control strategies of grid-connected ...

View more