Van Heerden
A5044020126- Gamma-ray bursts and supernovae
- Legal Issues in South Africa
- Astronomical Observations and Instrumentation
- Astrophysical Phenomena and Observations
- Astrophysics and Cosmic Phenomena
- Pulsars and Gravitational Waves Research
- SAS software applications and methods
- Comparative and International Law Studies
- Education Systems and Policy
- Astro and Planetary Science
- Teacher Education and Leadership Studies
- Competency Development and Evaluation
- Entrepreneurship Studies and Influences
- Biblical Studies and Interpretation
- Adaptive optics and wavefront sensing
- Higher Education Learning Practices
- Astronomy and Astrophysical Research
- Taxation and Legal Issues
- History and Developments in Astronomy
- Stellar, planetary, and galactic studies
- Solar and Space Plasma Dynamics
- Construction Project Management and Performance
- Marketing and Advertising Strategies
- Motivation and Self-Concept in Sports
- Human Resource Development and Performance Evaluation
University of the Free State
2013-2024
Universidad de Málaga
2024
Consejo Superior de Investigaciones Científicas
2024
Hospital de Santo António
2023
Universidade do Porto
2023
Tshwane University of Technology
2012-2020
Bhabha Atomic Research Centre
2020
University of Pretoria
2001-2018
University of South Africa
1999-2016
North-West University
2016
After the discovery of rings around largest known Centaur object, (10199) Chariklo, we carried out observation campaigns stellar occultations produced by second-largest (2060) Chiron, to better characterize its physical properties and presence material on surroundings. We predicted successfully observed two Chiron. These observations were used constrain size shape fitting elliptical limbs with equivalent surface radii in agreement radiometric measurements. Constraints Chiron are reported for...
Gaia16aye was a binary microlensing event discovered in the direction towards northern Galactic disc and one of first events detected alerted to by Gaia space mission. Its light curve exhibited five distinct brightening episodes, reaching up I=12 mag, it covered great detail with almost 25,000 data points gathered network telescopes. We present photometric spectroscopic follow-up covering 500 days evolution. employed full Keplerian orbit model combined motion Earth around Sun reproduce...
Abstract Thanks to the rapidly increasing time-domain facilities, we are entering a golden era of research on gamma-ray bursts (GRBs). In this Letter, report our observations GRB 240529A with Burst Optical Observer and Transient Exploring System, 1.5 m telescope at Observatorio de Sierra Nevada, 2.5 Wide Field Survey Telescope China, Large Binocular Telescope, Telescopio Nazionale Galileo. The prompt emission shows two comparable energetic episodes separated by quiescence time roughly 400 s....
In this paper, the possibility of periodic pulsar-like gamma-ray emission from white dwarfs in AE Aquarii and AR Scorpii is investigated. We show that dwarf magnetospheres can possibly induce potentials to accelerate charged particles energies excess one tera electronvolt (TeV) with associated through processes such as curvature radiation, inverse Compton, hadronic neutral pion decay. report here pulsed signatures at or close spin period both Fermi-LAT dataset. This may indicate these...
Reasons for participation in sport differ and intrinsic motivation, extrinsic motivation even amotivation can influence the decision. In South African context, little research has been done on differences of among male female students to participate sport. This study sought understand relationship between certain drivers participation. It also explored gender variable whether there are athletes terms their participating A non-probability sample was used 199 respondents participated. Results...
Religious beliefs affect end-of-life practices in intensive care units (ICUs). Changes over time were not investigated regarding religions. Twenty-two European ICUs (3 regions: Northern, Central, and Southern Europe) participated both Ethicus-1 (years 1999–2000) Ethicus-2 studies 2015–2016). Data of ICU patients who died or had limitations life-sustaining therapy analysed changes patient/physician religious affiliations. Frequencies, timing decision-making, affiliations physicians/patients...
Summary We report two patients with the Churg–Strauss syndrome who were found to have decreased cholinesterase activity despite normal phenotypes. Suspicion of abnormal sensitivity suxamethonium in first case was raised after prolonged paralysis under anaesthesia. The findings second incidental during course intensive care treatment. Both received immunosuppressive therapy. Differentiation between effects this and disease process itself cannot be established.
The current status of the Watcher robotic telescope is presented in light a recent hardware and software upgrade. latest gamma-ray burst rapid follow-up observations are discussed, with particular reference to GRB 120711A.