Latest News Archive

Please select Category, Year, and then Month to display items
Previous Archive
04 June 2024 | Story Leonie Bolleurs | Photo Kaleidoscope Studios
Prof Hendrik Swart
Prof Hendrik Swart’s prolific publication record, the high impact of his work, and the outstanding quality of his scholarly contributions have placed him among the top 0,05% of all scholars worldwide.

ScholarGPS awarded Prof Hendrik Swart, Senior Professor in the Department of Physics at the University of the Free State (UFS), Highly Ranked Scholar status.

ScholarGPS celebrates Highly Ranked Scholars™ for their performance in various fields, disciplines, and specialties. Prof Swart’s prolific publication record, the high impact of his work, and the outstanding quality of his scholarly contributions have placed him among the top 0,05% of all scholars worldwide.

Prof Swart received Highly Ranked Scholar status (Lifetime) for ranking 16th in the discipline of Phosphor. Highly Ranked Scholars™ – Lifetime refers to distinguished authors, including those who are currently active, retired, or deceased. These scholars are recognised for their exceptional lifetime scholarly contributions, placing them in the top 0,05% of all scholars. Their achievements are evaluated across four categories: overall (across all fields), within their specific field of study, within their particular discipline, and across all specialties they are associated with.

Additionally, Prof Swart received Highly Ranked Scholar status (prior five years) for ranking first in Condensed Matter Physics, 42nd in Physics, 155th in Sensor, 207th in Physical Science and Mathematics, and 969th in all fields.

Scientific profile and credibility

ScholarGPS is a California-based company that applies artificial intelligence, data mining, machine learning, and other data science techniques to its massive database of more than 200 million publications and 3 billion citations to rank more than 30 million scholars and 55 000 institutions worldwide. They categorise more than 200 million scholarly publications into specific academic specialties. These specialties are further organised into 177 disciplines and 14 overarching fields. As a result of this extensive classification effort, scholars who are considered highly ranked within their respective fields can now be identified with greater precision. This identification is done not only within each academic specialty, but also across disciplines and fields, providing a comprehensive view of scholarly achievement and expertise. This system allows for the identification of top scholars within various areas of academic research in a way that was not possible before.

Prof Swart, who is an NRF B1-rated researcher, currently also holds the SARChI Research Chair: Solid-state Luminescent and Advanced Materials (2023-2027). On receiving this award from ScholarGPS, he says it is always a privilege to be recognised as one of the top scholars in your specific field, especially at this late stage of his career.

Professionally, Prof Swart says this award may boost his scientific profile and credibility in the academic community, potentially leading to more collaborations and partnerships.

In the field of condensed matter physics, the impact of his work is specifically noteworthy in the study of defects and impurities within semiconductors, along with their practical applications in optoelectronic devices. Moreover, his significant contributions extend to understanding optical and electronic properties at the nanoscale, bearing implications for the development of semiconductor technology, including light-emitting diodes (LEDs), photovoltaic cells, and quantum dots.

Primarily focused on mentorship

He believes his successes in physics and advances in understanding the universe are the result of a combination of variables, including innovative research, collaboration and networking, mentorship, effective communication, persistence, and resilience. “I am primarily focused on mentorship, which is critical to developing the next generation of physicists and creating a supportive environment for learning and discovery, as well as conducting groundbreaking research and making novel discoveries that are critical to pushing the boundaries of physics. I am always searching for opportunities to collaborate with other scholars, both inside and outside my discipline, which will result in constructive exchange of ideas, interdisciplinary discoveries, and collective problem solving.”

News Archive

Sunflowers are satellite dishes for sunshine, or are they?
2016-07-20

Eighty-six percent of South Africa’s
sunflowers are produced in the
Free State and North West provinces.

Helen Mirren, the English actress, said “the sunflower is like a satellite dish for sunshine”. However, researchers at the University of the Free State (UFS) have found that too much of this sunshine could have a negative effect on the growth of sunflowers, which are a major source of oil in South Africa.

According to Dr Gert Ceronio from the Department of Soil, Crop, and Climate Sciences at the UFS, extremely high soil temperatures play a definite role in the sprouting of sunflower seedlings. Together with Lize Henning, professional officer in the department, and Dr André Nel from the Agricultural Research Council, he is doing research on biotic and abiotic factors that could have an impact on sunflowers.

Description: Sonneblom 2 Tags: Sonneblom 2

Various degrees of deformity (bad-left
to none-right) in seedlings of the same
cultivar at very high soil temperatures.
Photo: Dr Gert Ceronio

Impact of high temperatures on sunflower production

The Free State and North West provinces, which produce 86% of South Africa’s sunflowers, are afflicted especially by high summer temperatures that lead to extremely high soil temperatures.

Dr Ceronio says: “Although sunflower seeds are able to germinate at temperatures from as low as 4°C to as high as 41°C, soil temperatures of 35°C and higher could have a negative effect on the vegetative faculty of sunflower seedlings, and could have an adverse effect on the percentage of sunflowers that germinate. From the end of November until mid-January, this is a common phenomenon in the sandy soil of the Free State and North West provinces. Soil temperatures can easily exceed the critical temperature of 43°C, which can lead to poor germination and even the replanting of sunflowers.”

Since temperature have a huge impact not only on the germination of sunflower seeds, but also on the vegetative faculty and sprouting of sunflower seedlings, Dr Ceronio suggests that sunflowers should be planted in soil with soil temperatures of 22 to 30°C. Planting is usually done in October and early November. Unfortunately, this is not always possible, as soil moisture is not optimal for growth. Farmers are then compelled to plant sunflowers later.

Impact of herbicides on sunflower growth

“High soil temperatures, combined with the herbicide sensitivity of some cultivars, could lead to the poor development of seedlings," says Dr Ceronio.

The use of herbicides, such as ALACHLOR, for the control of weeds in sunflowers is common practice in sunflower production. It has already been determined that ALACHLOR could still have a damaging effect on the seedlings of some cultivars during germination and sprouting, even at recommended application dosages.

“The purpose of the continued research is to establish the sensitivity of sunflower cultivars to ALACHLOR when exposed to high soil temperatures,” says Dr Ceronio.

 

We use cookies to make interactions with our websites and services easy and meaningful. To better understand how they are used, read more about the UFS cookie policy. By continuing to use this site you are giving us your consent to do this.

Accept