Below you find the complete list of Tier-1-projects since the start of the regular project application programme.

7 Projects found Mathematics

Wind accretion onto compact objects in Supergiant X-ray binaries

Date: 01.07.2017
  • Promotor(s): Ileyk El Mellah , Jannis Teunissen
  • Institution(s): KU Leuven
  • Domain(s): Astronomy and astrophysics , Mathematics
In this project, we study how gas is accreted on a neutron star orbiting a stellar companion. In such binary systems, the gas rapidly accelerates towards the neutron star, generating X-ray emission. Astronomical observations have revealed that this emission can strongly fluctuate in time. There can for example be bursts which make the system tens of thousands times brighter, switches in the type of X-ray emission, and periodic oscillations. With the Tier-1 infrastructure and our adaptive simulation code we are now able to capture the accretion over a wide range of length and time scales to help understand these phenomena.

Outflows and particle evolution in relativistic astrophysics (OPERA) IV

Date: 01.07.2017
  • Promotor(s): Dimitrios Millas , Bart Ripperda , Rony Keppens , Oliver Porth
  • Institution(s): KU Leuven
  • Domain(s): Astronomy and astrophysics , Mathematics
We aim to perform simulations of a fast outflow (“jet”) originating from active galaxies, where the alignment of this jet with the line of sight is not constant with time. This will extend previous work using higher velocities and/or magnetic field hypothesis. The aim is to detect changes in the form and velocity of the jet on large scales. This project will also provide radiation maps and compare results with actual observations.

Modeling the evolution of interplanetary Coronal Mass Ejections: inclusion of a magnetic flux rope and coupling to a magnetospheric model

Date: 01.07.2017
  • Promotor(s): Christine Verbeke , Camilla Scolini , Stefaan Poedts
  • Institution(s): KU Leuven
  • Domain(s): Astronomy and astrophysics , Mathematics
'Space weather' refers to the complex effects of the radiation and the plasma stream from the Sun on our space environment and Earth. Solar eruptions and especially magnetic plasma clouds – called Coronal Mass Ejections (CMEs) –, are the most important drivers of space weather. Their magnetic field plays a very important role in quantifying the effects on Earth. We recently added a magnetic flux rope to our heliospheric model EUHFORIA, that models the solar background wind and the inserted CMEs up to Earth. The objective of this project is to run a series of simulations in order to assess the impact of the flux-rope model parameters on geospace. To achieve this goal, we will couple the GUMICS magnetospheric model to the outputs from EUHFORIA simulations.

The Kelvin-Helmholtz instability at the magnetosphere : impact of the environmental parameters on the penetration of high energy plasma

Date: 01.07.2017
  • Promotor(s): Matthieu Leroy
  • Institution(s): KU Leuven
  • Domain(s): Astronomy and astrophysics , Mathematics
The project consists in a study of the Kelvin-Helmholtz instability (KHI) at the Solar wind/Magnetosphere interface. We study different configurations that can occur in the KHI scenario in a three-dimensional Hall-MHD setting, where the double mid-latitude reconnection (DMLR) process is triggered by the equatorial roll-ups. The influence of various parameters on the growth rate of the KHI and thus the efficiency of the DMLR and the exchange of matter between the Solar Wind and Earth's magnetosphere is assessed. These different configurations may have discernible signatures that can be identified by spacecrafts diagnostics, therefore data that would be recorded by spacecrafts during such an event are simulated. The flow and topology study will be completed by a characterization of the profile that a particle population could display in such configurations, again in the scope of defining specific signatures of the DMLR.

Targeting Key Features that Determine the Robustness and Sensitivity of Pareto-optimal (PO) Selection Designs

Date: 01.03.2017
  • Promotor(s): Wilfried De Corte
  • Institution(s): UGent
  • Domain(s): Mathematics , Psychology
The validity/diversity dilemma constitutes the biggest threat to the practice of personnel selection because applicant pools are increasingly heterogeneous and the most valid pre-employment tests often show substantial mean group difference. To address the issue, methods have been proposed for designing selection systems that are Pareto-optimal (PO) and, hence, are expected to offer the best possible trade-off between the goals of selection quality and diversity. However, it is currently uncertain whether these systems live up to their promise in actual selection applications. Using simulation methods, the present project aims to resolve this uncertainty and to identify the key features that determine the practical performance of PO systems.