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29 October 2024 | Story Leonie Bolleurs | Photo Supplied
Thandi Mazibuko
Thandi Mazibuko, with her presentation: LED there be light, was the overall institutional winner in the PhD category and the runner-up in the national competition of this year’s 3MT competition.

The Centre for Graduate Support (CGS) recently (11 October 2024) hosted the annual institutional Three-Minute Thesis Competition (3MT), which was followed by the national competition (25 October). This year, the nationals took place on the UFS Bloemfontein Campus. According to Tshepiso Mokoena, responsible for Research Capacity Development in CGS, the participating master’s and PhD students gave well-prepared presentations. The competition aims to equip postgraduate students with valuable communication and presentation skills.

She says that postgraduate students are encouraged to do research that will benefit the community. “To do this, students should be able to communicate and present their research to a non-specialist audience. The 3MT competition trains and equips them with skills that they will use in their community and workplace,” she noted.

Overall PhD winner

The overall winner in the PhD category of the UFS competition was Thandi Mazibuko with her presentation: LED there be light. Thandi was also announced as the first runner-up at the national competition.

Growing up in Qwaqwa, Thandi’s passion for mathematics and the natural sciences led her to pursue a BSc Physics degree at the UFS in 2013, followed by an honours at the UFS. She then completed her MSc at the University of the Western Cape and worked as a science engagement intern at iThemba LABS in Cape Town, which inspired her to start a YouTube channel with more than 4 800 subscribers, called Thandisayensi. On this channel she uploads Physical Sciences videos for learners in grades 10-12.

Thandi states that she loves learning and being in learning environments; in 2022, she registered for a PhD in Solid State Physics under the supervision of Prof Hendrik Swart and Prof David Motaung.

Her research focuses on synthesising a phosphor material capable of emitting red, green, and blue light, which, when combined, creates the perception of white light. Thandi compared the research process to cooking, explaining how the preparation of phosphors resembles food preparation. She believes that relatable language, analogies, and storytelling are important tools in science communication.

Thandi says that this competition was a valuable platform to improve her science communication skills. “It is an interesting challenge to explain your work in 180 seconds to an audience with different backgrounds,” she said, adding that she is excited to represent the UFS at the national competition.

The other winners

Each department hosts its own 3MT competition, and the winners and runners-up in both the master’s and PhD categories then represent their faculty in the institutional competition.

The master’s category winners from other faculties were:

  • Faculty of Economic and Management Sciences: Evodia Mohoanyane with Does SI/tutoring work and what about it works? Evodia was also the overall winner in the institutional competition in the master’s category.
  • The Humanities: Yonwaba Matshobotiyana with Of Speaking and Visibility: Black Women Poets' Voices in South Africa
  • Health Sciences: Viwe Fokazi with Establishing a novel 3D doxorubicin-resistant triple-negative breast cancer spheroid model

In the PhD category, the winners were:

  • Economic and Management Sciences: Chrizaan Grobbelaar with The use of gamification to enhance retirement preparedness of millennials
  • The Humanities: Sheree Pretorius with The Psychometric Properties of the Prison Adjustment Questionnaire (PAQ) among South African Male Incarcerated Offenders

With Thandi, first runner-up of the institutional competition, Chrizaan, participated in the national 3MT competition. Universities such as the Nelson Mandela University, UNISA, University of KwaZulu-Natal, University of the Western Cape, University of Johannesburg, and the Central University of Technology were also present. 

News Archive

Research helps farmers save with irrigation
2017-02-15

Description: Irrigation research Tags: Irrigation research

Marcill Venter, lecturer in the Department of
Agricultural Economics at the University of the
Free State, has developed the mathematical
programming system, Soil Water Irrigation
Planning and Energy Management in order to
determine irrigation pump hours.
Photo: Rulanzen Martin

Her advice to farmers is that they should make sure they are aware of the total cost (investment and operating costs) of an irrigation system. In most cases the investment cost is low, but the operating cost over the lifetime of the system is high.

“It is very important to have a look at the total cost and to install the most economic system,” says Marcill Venter, lecturer at the University of the Free State (UFS), who has done research on the economic sustainability of water-pipe systems.

Irrigation systems important components for farming
This research comes at a time when many farmers are relying on their irrigation systems due to persistent drought and low rainfall during 2016. South Africa has also experienced an abnormal increase in electricity tariffs in recent years. Due to tariff increases which threaten the future profitability of irrigation producers, the Water Research Commission (WRC) has launched and financed a project on the sustainable management of irrigation farming systems. “I had the opportunity to work on the project as a researcher,” says Venter.

The heart of every irrigation system is the water pipes that bring life to crops and livestock, and this is what Venter’s research is about. “Water pipes are part of the whole design of irrigation systems. The design of the system impact certain factors which determine the investment and operating costs,” she says.

Mathematical system to help farmers
Venter and Professor Bennie Grové, also from the Department of Agricultural Economics at the UFS, designed the Soil Water Irrigation Planning and Energy Management (SWIP-E) programming model as part of the WRC’s project, as well as for her master’s degree. “The model determines irrigation pump hours through a daily groundwater budget, while also taking into account the time-of-use electricity tariff structure and change in kilowatt requirements arising from the main-line design,” says Venter. The model is a non-linear programming model programmed in General Algebraic Modeling System (GAMS).

Design of irrigation system important for sustainability

The main outcome of the study is that the time-of-use electricity tariff structure (Ruraflex) is always more profitable than the flat-rate structure (Landrate). The interaction between the management and design of a system is crucial, as it determines the investment and operating costs. Irrigation designers should take the investment and operating cost of a system into account during the design process. The standards set by the South African Irrigation Institute (SAII) should also be controlled and revised.

Water-pipe thickness plays major role in cost cuts
There is interaction between water-pipe thickness, investment and operating costs. When thinner water pipes are installed, it increases the friction in the system as well as the kilowatt usage. A high kilowatt increases the operating cost, but the use of thinner water pipes lowers the investment cost. Thicker water pipes therefore lower the friction and the kilowatt requirements, which leads to lower operating costs, but thicker pipes have a higher investment cost. “It is thus crucial to look at the total cost (operating and investment cost) when investing in a new system. Farmers should invest in the system with the lowest total cost,” says Venter.

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