Author:Sheik, Muhammed; Klein, Peter; Segakweng, TshiamoDate:Nov 2021Solar energy supply does not always match demand and it is therefore necessary to investigate efficient ways of storing thermal energy. Sorption based thermochemical heat storage provides high energy densities as well as an exceptional advantage ...Read more
Author:Nyadongo, ST; Olakanmi, EO; Pityana, Sisa LDate:Sep 2021Laser cladded (LC) tribaloy (T-800) coating has been used for surface modification of engineering components in high wear and elevated temperature service environments. However, the cracking phenomenon often observed in LC T-800 coating is ...Read more
Author:Mbanjwa, MB; Land, K; Jewell, LL; Gledhill, Irvy MADate:Jan 2011The production of water-in-oil (w/o) emulsions in T-junction microfluidic channels was studied through experiments and computational fluid dynamics (CFD). W/o emulsions were produced in the microchannels from deionised water and mineral oil. ...Read more
Author:Mbanjwa, MBDate:01 Sep 2010Flow of immiscible fluids is important in microfluidics for applications such as generation of emulsions and vesicles, drug delivery capsules, cell encapsulation and chemical reactions. The behaviour of these flows differs from large scale ...Read more
Author:Scheepers, G; Morris, RM; Visser, JA; Roos, TH; Snedden, Glen CDate:Jan 2006This paper describes an experimental and numerical study of the heat transfer augmentation near the entrance to a gas turbine film cooling hole at different engine representative suction ratios (Vhole/V). For the experimental component the ...Read more
Author:Lavrov, A; Vervoort, A; Wevers, M; Napier, JALDate:Apr 2002Sensitivity of the Kaiser effect to the deviations of the directions of sigma(1)-principal stress experienced by rock in Successive loading cycles has an important impact on the application of this effect for stress measurements in rocks. The ...Read more
Author:Pandelani, Thanyani A; Schutte, Zelldra; Wium, ElsmariDate:Sep 2018Blast waves from landmines and Improvised Explosive Devices (IEDs) produce an almost instantaneous rise in pressure which causes Primary Blast Injuries (PBI). The primary blast injuries are caused directly by the blast wave and encompasses ...Read more
Author:Pandelani, Thanyani A; Schutte, Zelldra; Wium, ElsmariDate:Sep 2018Blast waves from landmines and Improvised Explosive Devices (IEDs) produce an almost instantaneous rise in pressure which causes Primary Blast Injuries (PBI). The primary blast injuries are caused directly by the blast wave and encompasses ...Read more
Author:Soare, A; Ball, H; Hayes, D; Zhen, X; Jarratt, MC; Sastrawan, J; Uys, H; Biercuk, MJDate:Apr 2014We develop and demonstrate a technique to engineer universal unitary baths in quantum systems. Using the correspondence between unitary decoherence due to ambient environmental noise and errors in a control system for quantum bits, we show ...Read more
Author:Bambalaza, Sonwabo E; Langmi, HW; Mokaya, R; Musyoka, Nicholas M; Khotseng, LEDate:May 2020High-pressure (700 MPa or ∼100 000 psi) compaction of dehydroxylated and hydroxylated UiO-66 for H2 storage applications is reported. The dehydroxylation reaction was found to occur between 150 and 300 °C. The H2 uptake capacity of powdered ...Read more
Author:M'Boungui, G; Loveday, Philip W; Long, Craig SDate:Jan 2010The authors investigate a novel ultrasonic motor which generates a stator trajectory in the form of a figure-of-eight by superimposing two resonant modes, with one double the frequency of the other. Topology optimization was used to design ...Read more
Author:Loveday, Philip W; Dhuness, Kahesh; Long, Craig SDate:Sep 2018Guided wave ultrasoud offers the potential to monitor long sections of structures such as pipes and rails from a single transducer location and is used in a system for monitoring continuouosly welded rail track which was developed in South AfricaRead more
Author:Machaka, Ronald; Chikwanda, HKDate:May 2015This paper reports on an attempt to independently evaluate the validity and applicability of a new compaction equation recently presented by Gerdemann and Jablonski [Metallurgical and Materials Transactions A, 42 (2011) 1325-1333] using ...Read more
Author:Dudley, Angela L; Vasilyeu, R; Forbes, A; Khilo, N; Ropot, PDate:Jul 2009This presentation provides information on experimental generation and application of the superposition of higher-order Bessel beams. The superposition of zero order Bessel beams can be used to measure the radius of curvature of a reflecting ...Read more
Author:Klein, Peter; Roos, TH; Sheer, TJDate:Sep 2013High temperature thermal storage in randomly packed beds of ceramic particles is proposed as an effective storage solution for Solar Gas Turbine (SGT) cycles in the near term. Numerical modelling of these systems allows for optimised thermal ...Read more
Author:Chetty, Brenton L; Isaac, Sherrin J; Walingo, TDate:Sep 2023There are many challenges associated with developing a feasible wireless communication system for the harsh underground mining environment. Radio signals suffer from strong attenuations due to the excessive reflections, diffractions, scatterings, ...Read more
Author:Dunn, Dwain I; Snedden, Glen C; Von Backström, TWDate:Jan 2010Turbine manufacturers are striving to develop turbines that are more efficient. One area of focus has been the control of secondary flows through the use of non-axisymmetric endwalls. The majority of development has been performed in cascades ...Read more