Now showing items 5-15 of 15

    • Fabrication of affordable and sustainable solar cells using NiO/TiO2 P-N heterojunction. 

      Ukoba, Kingsley O.; Inambao, Freddie L.; Eloka-Eboka, Andrew C. (Hindawi., 2018)
      The need for affordable, clean, efficient, and sustainable solar cells informed this study. Metal oxide TiO²/NiO heterojunction solar cells were fabricated using the spray pyrolysis technique. The optoelectronic properties ...
    • Influence of concentration on properties of spray deposited nickel oxide films for solar cells. 

      Ukoba, Kingsley O.; Eloka-Eboka, Andrew.; Inambao, Freddie. (Elsevier., 2017)
      Spray pyrolysis technique was used to deposit various concentration of nickel oxide films on glass substrate. The Effect of varying precursor concentration on elemental, morphological and structural properties was ...
    • Modeling of fabricated NiO/TiO2 P-N heterojunction solar cells. 

      Ukoba, Kingsley O.; Inambao, Freddie. (Research India Publications., 2018)
      This paper reports modelling and theoretical validation of a fabricated NiO/TiO2 P-N heterojunction solar cell. The solar cell equations were modelled and thereafter theoretical validation of the fabricated solar cells was ...
    • Modelling of broadband powerline communication channels. 

      Mulangu, Chrispin Tshikomba.; Afullo, Thomas Joachim Odhiambo.; Ijumba, Nelson M. (SAIEE Publications., 2011-12)
      This paper develops a new PLC model and investigates the impact of the load, line length, and diameter of the transmission line on the channel transfer function over the frequency range of 1-20 M Hz. The results show that ...
    • Quantitative Feedback Theory design of line current commutated HVDC control systems. 

      Chetty, Leon.; Ijumba, Nelson M. (SAIEE Publications., 2013)
      Line Current Commutated (LCC) HVDC systems consists of uncertain plants. These uncertainties are result of changes/disturbances in the ac networks or in the LCC HVDC system itself. Further uncertainties can be introduced ...
    • Rural electrification using overhead HVDC transmission lines. 

      Chetty, Leon.; Ijumba, Nelson M. (Energy Research Centre., 2012)
      One of mankind’s greatest modern challenges is poverty alleviation. The provision of electricity can greatly assist in this regard. The tapping of small amounts of power from an HVDC transmission line represents a solution ...
    • Safety of low voltage switchgear assemblies in South Africa – Part 1. 

      Bonner, Mark James.; Ijumba, Nelson M. (EE Publishers., 2005-10)
      A technical analysis was undertaken to investigate the safety implications of the introduction of the category Specially Tested Assembly (STA) into the South African standard SANS 1473-1:2003. The testing requirements ...
    • Safety of low voltage switchgear STAs in South Africa – Part 2. 

      Bonner, Mark James.; Ijumba, Nelson M. (EE Publishers., 2005-11)
      This article is Part 2 of a two part article. Part 1 was published in the October 2005 issue of ENERGIZE. A technical analysis was undertaken to investigate the safety implications of the introduction of the category ...
    • Solar cells and global warming reduction. 

      Ukoba, Kingsley O.; Inambao, Freddie. (Research India Publications., 2018)
      This study proposes one way of addressing the issue of climate change and pollution using solar cells. The quality of life in developing and low-income countries is on the decline because of air pollution. Energy has a ...
    • Suppression of transients across the tap windings of an auto-transformer. 

      Buthelezi, N. V.; Ijumba, Nelson M.; Britten, Anthony C. (EE Publishers., 2005-06)
      For the energy transfer between the various voltage levels of the Eskom national grid, auto-transformers are mainly installed. These auto-transformers are interfaced with the distribution network.
    • System identification of classic HVDC systems. 

      Chetty, Leon.; Ijumba, Nelson M. (SAIEE Publications., 2011-12)
      Determining models from observations and studying the models’ properties is essentially the functionality of science. Models attempt to link observations into some pattern. System identification is the art of building ...