Faculty of Engineering & Technology: Recent submissions

Now showing items 1-20 of 133

Application of attainable region technique to optimize copper slag’s desired size class

Gabasiane, Tlotlo, Solomon; Danha, Gwiranai; Mamvura, Tirivaviri; Mashifana, Tebogo; Sibanda, Vusumuzi (MDPI, Basel, Switzerland, 2022-12-23)

Copper slag is a hard material produced from smelting copper-bearing ores. Over the years, research has prioritized utilizing slag as a secondary source of base metals. This paper focuses on the grinding/milling of copper ...
Analysis and optimization of auto-correlation based frequency offset estimation

Ngebani, I.M.; Chuma, Joseph Monamati; Masupe, S. (South Africa Institute of Electrical Engineers, 2015-09)

In this letter, a general auto-correlation based frequency offset estimation (FOE) algorithm is analyzed. An approximate closed-form expression for the Mean Square Error (MSE) of the FOE is obtained, and it is proved that, ...
Hydrogeochemical evaluation of groundwater quality in Dukwi wellfield in Botswana

Diphofu, Abijah; Yendaw, Jerome A.; Suglo, Raymond S. (International Journal of Innovation Creativity and Change (herein referred to as ‘IJICC’), 2022)

There has been a decline in groundwater quality in most wellfields in Botswana. This study evaluated the groundwater quality in Dukwi Wellfield for drinking and irrigation purposes and characterised the dominant hydrochemical ...
A concealed based approach for secure transmission in advanced metering infrastructure

Kebotogetse, Otisitswe; Samikannu, Ravi; Yahya, Abid (Institute of Electrical and Electronics Engineers (IEEE), 2022-08-17)

The smart grid has an important subsystem known as the Advanced Metering Infrastructure (AMI), responsible for measuring customer consumption of electricity. The AMI subsystem has smart meters as one of the components and ...
Terrestrial free space optical communication systems availability based on meteorological visibility data for South Africa

Kolawole, Olabamidele O.; Afullo, Thomas J.O.; Mosalaosi, Modisa (South African Institute of Electrical Engineers (SAIEE Africa Research Journal), 2022-03)

In spite of the numerous advantages of employing free space optical (FSO) communication systems as viable complementary platforms for next-generation networks, the presence of atmospheric disturbances such as fog and ...
Image compression techniques in wireless sensor networks: a survey and comparison

Lungisani, Bose A.; Lebekwe, Caspar K.; Zungeru, Adamu Murtala; Yahya, Abid (Institute of Electrical and Electronics Engineers (IEEE), 2022-08-10)

There is continuous intensive research on image compression techniques in wireless sensor networks (WSNs) in the literature. Some of the image compression techniques in WSNs that exist in the literature include discrete ...
Fuzzy logic control for solar PV fed modular multilevel inverter towards marine water pumping applications

Stonier, Albert Alexander; Murugesan, Srinivasan; Samikannu, Ravi; Krishnamoorthy, Vinoth; Subburaj, Senthil Kumar; Chinnaraj, Gnanavel; Mani, Geetha (Institute of Electrical and Electronics Engineers (IEEE), 2021-06-28)

This paper presents the design and implementation of Modular Multilevel Inverter (MMI) to control the Induction Motor (IM) drive using intelligent techniques towards marine water pumping applications. The proposed inverter ...
Power quality improvement in solar fed cascaded multilevel inverter with output voltage regulation techniques

Stonier, Albert Alexander; Murugesan, Srinivasan; Samikannu, Ravi; Venkatachary, Sampath Kumar; Kumar, Senthil S.; Arumugam, Prakash (Institute of Electrical and Electronics Engineers (IEEE), 2020-09-29)

The presence of harmonics in solar Photo Voltaic (PV) energy conversion system results in deterioration of power quality. To address such issue, this paper aims to investigate the elimination of harmonics in a solar fed ...
Investigation on impact of magnetic field on the corona discharge activity in Punga oil using fluorescent fiber and UHF sensor techniques

Murugesan, Srinivasan; Amalanathan, Arputhasamy Joseph; Sarathi, Ramanujam; Srinivasan, Balaji; Samikannu, Ravi (Institute of Electrical and Electronics Engineers (IEEE), 2021-09-16)

This paper reports the experimental investigation of the corona discharge activity of punga oil under the influence of a local magnetic field and different voltage profiles (AC and DC voltages) using fluorescent fiber ...
Generation and composition of municipal solid waste: case study, extension 7, Palapye, Botswana

Letshwenyo, Moatlhodi Wise; Kgetseyamore, Dirang (Springer Nature Limited, 2020-09-10)

The rapid population growth and industrialisation has contributed to the production of large quantities of solid wastes that should be managed properly. This study was conducted to investigate the generation and composition ...
Multistage gold mineralization events in the Archean Tati greenstone belt, northeast Botswana: constraints from integrative white mica Ar/Ar, garnet U-Pb and sulfides Pb/Pb geochronology

Bineli-Betsi, Thierry Olivier; Mokane, Lebogang; McFarlane, Chris; Phili, Kelebogile; Kelepile, Tebogo (Elsevier B.V, 2020-01-09)

The Tati Greenstone Belt (TGB) in northeastern Botswana hosts numerous Au deposits (Shashe, Mupane and Signal Hill) associated with sulfides, garnet and white mica. In this study, integrative white mica Ar/Ar, garnet U-Pb ...
Deployment of IoV for smart cities: applications, architecture, and challenges

Ang, Li-Minn; Seng, Kah Phooi; Ijemaru, Gerald K; Zungeru, Adamu Murtala (IEEE, 2019-01-16)

The Internet of Vehicles (IoV) is a convergence of the mobile Internet and the Internet of Things (IoT), where vehicles function as smart moving intelligent nodes or objects within the sensing network. This paper gives ...
Mineralogy and geochemistry of the Ngaoundaba Crater Lake sediments, northern Cameroon: implications for provenance and trace metals status

Bessa, Armel Zacharie Ekoa; Armstrong-Altrin, John S; Fuh, Gentry Calistus; Bineli-Betsi, Thierry Olivier; Kelepile, Tebogo; Ndjigui, Paul-Desire (Springer Link, 2021-03-18)

This study was conducted on the Ngaoundaba Crater Lake sediments to infer provenance, weathering conditions, organic matter accumulation, and trace metal concentrations. Ngaoundaba Lake sediments were collected using a ...
A preliminary application of a machine learning model for the prediction of the load variation in three-point bending tests based on acoustic emission signals

Kaklis, Kostas; Saubi, Onalethata; Jamisola, Rodrigo S; Agioutantis, Zach G (Elsevier B.V., 2021)

The load variation during three-point bending (TPB) tests on prismatic Nestos (Greece) marble specimens instrumented by piezoelectric sensors is predicted using acoustic emission (AE) signals. The slope of the cumulative ...
A phytolith supported biosphere-hydrosphere predictive model for southern Ethiopia: insights into paleoenvironmental changes and human landscape preferences since the last glacial maximum

Fischer, Markus L.; Bachofer, Felix; Yost, Chad L.; Bludau, Ines J. E.; Schepers, Christian; Foerster, Verena; Lamb, Henry; Schäbitz, Frank; Asrat, Asfawossen; Trauth, Martin H.; Junginger, Annett (MDPI, 2021-10-08)

During the past 25 ka, southern Ethiopia has undergone tremendous climatic changes, from dry and relatively cold during the Last Glacial Maximum (LGM, 25–18 ka) to the African Humid Period (AHP, 15–5 ka), and back to ...
Prediction of genes that function in methanogenesis and CO2 pathways in extremophiles

Tilahun, Lulit; Asrat, Asfawossen; Wessel, Gary M.; Simachew, Addis (MDPI, 2021-10-24)

Gaet’ale (GAL) and Mud’ara (MUP) are two hypersaline ponds located in the Danakil Depression recharged by underground water from the surrounding highlands. These two ponds have different pH, salinity, and show variation ...
Fuzzy model-based reconstruction of paleovegetation in Ethiopia

von Reumont, Frederik; Schäbitz, Frank; Asrat, Asfawossen (Informa UK Limited, trading as Taylor & Francis Group, 2022-05-31)

We introduce a new method to compute plant distribution in Ethiopia under paleoclimatic conditions using fuzzy logic. Using a published map of the potential vegetation for Ethiopia we decipher the boundary conditions for ...
Orbital controls on eastern African hydroclimate in the Pleistocene

Lupien, Rachel L; Russell, James M; Pearson, Emma J; Castañeda, Isla S; Asrat, Asfawossen; Foerster, Verena; Lamb, Henry F; Roberts, Helen M; Schäbitz, Frank; Trauth, Martin H; Beck, Catherine C; Feibel, Craig S; Cohen, Andrew S (Springer Nature Limited, 2022-02-24)

Understanding eastern African paleoclimate is critical for contextualizing early human evolution, adaptation, and dispersal, yet Pleistocene climate of this region and its governing mechanisms remain poorly understood due ...
Age of the oldest known Homo sapiens from eastern Africa

Vidal, Celine M; Lane, Christine S; Asrat, Asfawossen; Barfod, Dan N; Mark, Darren F; Tomlinson, Emma L; Tadesse, Amdemichael Zafu; Yirgu, Gezahegn; Deino, Alan; Hutchison, William; Mounier, Aurélien; Oppenheimer, Clive (Springer Nature Limited, 2022-01-12)

Efforts to date the oldest modern human fossils in eastern Africa, from Omo-Kibish1,2,3 and Herto4,5 in Ethiopia, have drawn on a variety of chronometric evidence, including 40Ar/39Ar ages of stratigraphically associated ...
Hydroclimate changes in eastern Africa over the past 200,000 years may have influenced early human dispersal

Schaebitz, Frank; Asrat, Asfawossen; Lamb, Henry F; Cohen, Andrew S; Foerster, Verena; Duesing, Walter; Kaboth-Bahr, Stefanie; Opitz, Stephan; Viehberg, Finn A; Vogelsang, Ralf; Dean, Jonathan; Leng, Melanie J; Junginger, Annett; Ramsey, Christopher Bronk; Chapot, Melissa S; Deino, Alan; Lane, Christine S; Roberts, Helen M; Vidal, Céline; Tiedemann, Ralph; Trauth, Martin H (Springer Nature Limited, 2021-06-14)

Reconstructions of climatic and environmental conditions can contribute to current debates about the factors that influenced early human dispersal within and beyond Africa. Here we analyse a 200,000-year multi-proxy ...

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