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Browsing by Subject "Optimization"

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Development of an optimal piezoelectric transducer to excite guided waves in a rail web

Author: Ramatlo, Dineo AM ; Wilke, DN ; Loveday, Philip W Date: Apr 2018 Ultrasonic transducers have demonstrated the ability to effectively excite guided waves that can propagate over long distances and are thus employed in monitoring systems. An ultrasonic piezoelectric transducer that strongly excites a mode ... Read more
Effect of high temperature annealing on the grain size of CVD-grown SiC and experimental PBMR TRISO coated particles

Author: Mokoduwe, SM ; Van Rooyen, IJ ; Neethling, JH ; Janse van Vuuren, A ; Olivier, EJ Date: Oct 2010 Recent research and development activities of the PBMR Fuel Characterization and Optimization Programme focused on the high temperature characteristics of the PBMR fuel and more specifically on the SiC layer. PBMR fuel consists of Tri-Isotropic ... Read more
Energy optimization based path selection algorithm for IEEE 802.11s wireless mesh networks

Author: Mhlanga, Martin M ; Olwal, TO ; Mutanga, MB ; Adigun, MO Date: Sep 2011 It is everyone’s dream to have network connectivity anywhere at all times. This dream can only be realized provided there are feasible solutions that are put in place for the next generation of wireless works. Wireless Mesh Networks (WMNs) ... Read more
Experience in profiling and optimizing a 5G standAlone Radio Access Network (RAN) based on an open source testbed

Author: Mamushiane, Lusani ; Lysko, Albert A ; Mwangama, J ; Kobo, Hlabishi I ; Otieno, HO Date: Aug 2023 The adoption of 5G technology in Africa has been increasing steadily, with initial emphasis on non-standalone (NSA) architecture to leverage existing 4G investments and accelerate return on investment. The uptake of standalone (SA) 5G has ... Read more
Extraction of siphonochilus aethiopicus essential oil by steam distillation

Author: Malaka, MS ; Naidoo, Kersch ; Kabuba, J Date: Apr 2017 Siphonochilus aethiopicus is an indigenous South African plant also known as African ginger. It has often been used for its medicinal properties to treat various ailments such as flu, colds, and so forth. The research aim of this study was ... Read more
Given a SDN topology, how many controllers are needed and where should they go?

Author: Mamushiane, Lusani ; Mwangama, J ; Lysko, Albert A Date: Nov 2018 Software Defined Networking (SDN) presents a paradigm shift in network management and configuration. The idea of having an externalized control plane opens many unanswered questions regarding scalability, fault tolerance and performance of ... Read more
Hydrothermal conversion of South African coal fly ash into pure phase Zeolite Na-P1

Author: Gitari, MW ; Petrik, LF ; Musyoka, Nicholas M Date: Aug 2016 South African coal combustion power utilities generate huge amounts of coal fly ash that can be beneficiated into zeolitic products. This chapter reports on the optimization of the presynthesis and synthesis conditions for a pure-phase zeolite ... Read more
LAM additive manufacturing: A fundamental review on mechanical properties, common defects, dominant processing variables, and its applications

Author: Sibisi, TH ; Shongwe, MB ; Tshabalala, Lerato C ; Mathoho, Ipfi Date: Aug 2023 A cutting-edge manufacturing technology that uses powder or wire as the feeding material and a high-energy heating source is known as metal additive manufacturing (AM). High-performance components for automotive, aerospace, medical, and energy ... Read more
Maximization of quadruple phase boundary for alkaline membrane fuel cell using nonstoichiometric a-MnO2 as cathode catalyst

Author: Shi, X ; Ahmad, S ; Perez-Salcedo, K ; Escobar, B ; Zheng, Haitao ; Kannan, AM Date: Jan 2019 Oxygen can only be reduced at the quadruple phase boundary (catalyst, carbon support, ionomer and oxygen) of the cathode catalyst layer with non-conducting electrocatalyst. To maximize the quadruple phase boundary sites is crucial to increase ... Read more
Modelling and optimisation studies for generator dispatch strategies for deployment of an off-grid micro-grid in South Africa

Author: Oloo, Fiona RA ; Molefyane, Basetsana ; Rampokanyo, Mpeli J Date: Sep 2020 This paper presents the modelling of an off-grid micro-grid situated in a remote rural village in Eastern Cape province in South Africa. The modelling looks at the optimization studies for control dispatch strategies for the integration of ... Read more
Optimal control surface mixing of an unconventional UAV

Author: Miles, Elizna ; Broughton Date: Sep 2015 This paper presents an overview of the work conducted on the Optimal control surface mixing of an unconventional UAV. Read more
Optimal sampling schemes applied in geology

Author: Debba, Pravesh Date: May 2010 The presentation was an the University of Pretoria to geology students. It focused on ways to design optimal sampling schemes to target specific minerals. Read more
Optimisation of a novel trailing edge concept for a high lift device

Author: Botha, JDM ; Dala, L ; Schaber, S Date: 2015 This study aimed to observe the effect of a novel concept (referred to as the flap extension) implemented on the leading edge of the flap of a three element high lift device. The high lift device, consisting of a flap, main element and slat ... Read more
Optimization of electrospinning parameters for chitosan nanofibres

Author: Jacobs, V ; Patnaik, A ; Anandjiwala, RD ; Maaza, M Date: Jun 2011 Electrospinning of chitosan, a naturally occurring polysaccharide biopolymer, has been investigated. In this paper, the authors report the optimization of electrospinning process and solution parameters using factorial design approach to ... Read more
Optimization of process and solution parameters in electrospinning polyethylene oxide

Author: Jacobs, V ; Patanaik, A ; Anandjiwala, RD Date: Nov 2011 This paper reports the optimization of electrospinning process and solution parameters using factorial design approach to obtain uniform polyethylene oxide (PEO) nanofibers. The parameters studied were distance between nozzle and collector ... Read more
Optimization of pyrolysis conditions for char production from rice husks and its characterization as a precursor for production of activated carbon

Author: Menya, E ; Olupot, PW ; Storz, H ; Lubwama, M ; Kiros, Y ; John, Maya J Date: Mar 2019 Response surface methodology was employed to optimize pyrolysis conditions for production of char with maximum yield, fixed carbon content, and with minimum ash content from Uganda’s New Rice for Africa (NERICA) 1 rice husk variety. The aim ... Read more
Optimum placement of SDN controllers in African backbones: SANREN and ZAMREN as a case study

Author: Mamushiane, Lusani ; Mwangama, J ; Lysko, Albert A Date: Sep 2018 Software Defined Networking (SDN) has emerged as a potential solution to the ICT inequality challenge in emerging markets. This technology promises to revolutionize the telecommunications industry by introducing decoupled architectures to ... Read more
Parametric optimization of laser deposited high entropy alloys using response surface methodology (RSM)

Author: Dada, M ; Popoola, P ; Mathe, Ntombizodwa R ; Pityana, Sisa L ; Adeosun, S Date: Aug 2020 In this study, a full-factorial design of experiments was systematically structured to optimize the laser processing parameters of additively manufactured high entropy alloys by determining the impact of these parameters on the mechanical ... Read more
The potential of ball-milled South African bentonite clay for attenuation of heavy metals from acidic wastewaters: Simultaneous sorption of Co(sup2+), Cu(sup2+), Ni(sup2+), Pb(sup2+), and Zn(sup2+) ions

Author: Vhahangwele, M ; Mugera, GW Date: Dec 2015 Adsorption of Co(sup2+), Cu(sup2+), Ni(sup2+), Pb(sup2+), and Zn(sup2+) by bentonite clay from polycationic solution was investigated. Mineralogical composition of clay was done using X-ray diffraction (XRD), elemental composition using X-ray ... Read more
Robust facility location of container clinics: A South African application

Author: Karsten, Carike ; Bean, WL ; Van Heerden, Quentin Date: Feb 2023 There is a lack of dynamic facility location models for developing countries that consider the changes in the problem environment over time, such as patient population and population migration. Therefore, this paper focuses on using optimization ... Read more

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