Author:Lehong, C; Isong, B; Lugayizi, F; Abu-Mahfouz, Adnan MIDate:Dec 2021LoRaWAN has established itself as one of the leading MAC layer protocols in the field of LPWAN. Although the technology itself is quite mature, its resource allocation mechanism, the Adaptive Data Rate (ADR) algorithm is still quite new, ...Read more
Author:Adedeji, KB; Hamam, Y; Abe, BT; Abu-Mahfouz, Adnan MIDate:Jul 2017The analysis of water piping system has been presented by several authors in the past and in recent years proposing several solution algorithms. Among the notable methods are the Hardy cross method, linear approximation method, Newton Raphson ...Read more
Author:Boguslavsky, L; Tsehloane, CDate:Nov 2008The main function of textile filter media in air filtration is to control air pollution. Air filtration plays an important role in improving air quality and hygiene. The demands for air quality and hygiene at work places have increased greatly ...Read more
Author:Landman, WA; Beraki, Asmerom F; DeWitt, D; Lötter, DDate:Oct 2014Seasonal-to-interannual hindcasts (re-forecasts) for December-January-February (DJF) produced at a 1-month lead-time by the ECHAM4.5 atmospheric general circulation model (AGCM) are verified after calibrating model output to DJF rainfall at ...Read more
Author:Suliman, Ridhwaan; Peake, NDate:Jul 2015The deformation of slender elastic structures due to the bulk motion of fluid around it is a common multiphysics problem encountered in many applications. In this work we implement two computational FSI approaches in a partitioned manner: a ...Read more
Author:Warrell, Jonathan; Mhlanga, MusaDate:May 2017Coregulation of the expression of groups of genes has been extensively demonstrated empirically in bacterial and eukaryotic systems. Such coregulation can arise through the use of shared regulatory motifs, which allow the coordinated expression ...Read more
Author:Litvin, IADate:May 2013In this paper we present a general approach to determine the stability of a laser cavity which can include non-conventional phase transformation elements. We consider two pertinent examples of the detailed investigation of the stability of a ...Read more
Author:Radebe, N; Thwala, Melusi; Cele, LM; Sikhwivhilu, L; Musee, N; Shumbula, PDate:Aug 2013The current study seeks to investigate the dissolution dynamics of silver (nAg) and zinc oxide (nZnO) engineered nanoparticles (ENPs), and how this affects their uptake by aquatic higher plants. First, the influence of particle size and ...Read more
Author:Radebe, N; Cele, LM; Sikhwivhilu, L; Shumbula, P; Musee, N; Thwala, MelusiDate:2014Silver nanoparticles (nAg) are currently some of the widely produced and applied in commercial products. Their high usage translates to an increased potential to environmental release, and more concerning is their complex toxicity towards ...Read more
Author:Hanekom, EC; Barkenhuysen, FADate:Aug 1975Relatively stable concentrated DCCA solutions with a low pH value were obtained by using a mixture of an organic and an inorganic acid.Read more
Author:Visser, Daniel F; Hennessy F; Rashamuse J; Pletschke B; Brady DDate:Aug 2010Uridine phosphorylase from Escherichia coli was evolved by iterative saturation mutagenesis. The best mutant showed a temperature optimum of 60C and a half-life of 17.3 h at 60C. The mutant enzyme, as well as a purine nucleoside phosphorylase ...Read more
Author:Hall, G; Woodborne, SM; Scholes, MDate:Jan 2008The potential to provide environmental proxies using stable carbon isotopes from modern and archaeological charcoal is explored. Experiments on modern Podocarpus (Yellowwoods) show that δ13C values of stems, branches and charcoal preserve ...Read more
Author:Wakelin, J; McKechnie, AE; Woodborne, SMDate:Jul 2010The Blue Swallow (Hirundo atrocaerulea) is a threatened intra-African migrant with breeding populations in three geographically disjunct regions. We analysed stable hydrogen, nitrogen and carbon isotope ratios in feather keratin to determine ...Read more
Author:O'Kennedy, Maretha M; Burger, JT; Watson, TGDate:Apr 1998Focuses on the transformation of the embryogenic type II callus, initiated from cultured immature zygotic embryos of the maize line Hi-II, by microprojectile bombardment using a particle inflow gun. Use of the plasmid pAHC25; Tissue culture ...Read more
Author:Van Reenen, Coralie ADate:Feb 2016Noise in hospitals can negatively affect users. Guideline noise levels for hospital wards are stipulated by the World Health Organization (WHO) and a South African National Standard (SANS). Studies show that few hospitals comply with the ...Read more
Author:Ngobese, Sibusiso S; Pelders, Jodi L; Botha, W; Magweregwede, Fleckson; Schutte, IDate:Apr 2023A people-centric, systematic approach that involves different stakeholders is considered necessary to successfully address changes associated with modernizing the South African mining industry. In this paper we discuss the inclusion of various ...Read more
Author:Hwabamungu, B; Brown, I; Williams, QuentinDate:Jan 2018Recent literature on organisational strategy has called for greater emphasis on individuals (stakeholders) and what they do in the process of strategizing. Public sector organisations have to engage with an array of heterogeneous stakeholders ...Read more
Author:Masonta, Moshe T; Olwal, T; Mekuria, Fisseha; Mzyece, MDate:Aug 2014In television white space networks, secondary users are required to query an authorised geo-location spectrum database (GSDB) in order to determine the vacant channels or white spaces. While recent development of the Protocol to Access White ...Read more
Author:Thompson, MDate:Jan 1996For large areas, satellite remote-sensing techniques have now become the single most effective method for land-cover and land-use data acquisition. However, the majority of land-cover (and land-use) classification schemes used have been ...Read more