Liviu Ixaru, a distinguished scientist, is a pioneer of the research in computational physics in Romania. He is well known in the international scientific community for the highly efficient CP methods for the numerical solution of the Schroedinger equation and for new techniques for operations on oscillatory functions. Both are frequently used in investigations in nuclear, atomic and molecular physics.
He is also active in applied mathematics where he is notorious for first-hand results in the theory of exponential fitting. He is an associate editor for the prestigious ‘Journal of Computational and Applied Mathematics’ (Elsevier) and is involved in a number of international cooperations with physicists and mathematicians.
Liviu Ixaru is one of the four scientists (the others are Stan Scott (University of Belfast), Penny Scott (School of Maths & Physics) and Christophe Denis (Pierre & Marie Curie University, Paris)) who received the HPC prize 2006 for machine utilization, for work on the fast computation of Slater integrals, see http://www.qub.ac.uk/schools/eeecs/NewsandEvents/
The joint work of Liviu Ixaru, Stan Scott and Penny Scott, under an EPSRC grant in 2005 and rated as ``outstanding” in EPSRC’s grant review process, plays a central role in this achievement. They formulated a new computational strategy for the Slater integrals by designating numerical methods which advantageously exploit as many characteristic features of the problem as possible, to result in a hand crafted quadrature package that both improves the accuracy and significantly reduces the computation time.
By further exploiting parallelism on HPCx the resulting implementation, which enhances the accuracy by three more decimal figures, is up to 350 times faster than the original and 25 times less costly. It paves the way for an effective basis to carry out virtual experiments on HPC and Grid architectures to study scattering from H-like atoms and ions at intermediate energies.
HPC prize for Research Director
The UK Research Councils' High End Computing Strategy Committee organizes an annual competition for users of the UK's national HPC services, in order to support and promote innovative and efficient use of national HPC services.
This year the prize for machine utilization was awarded to Professor Stan Scott for work on the fast computation of Slater integrals performed in collaboration with Penny Scott (School of Maths & Physics) and visitors Liviu Ixaru (Institute of Physics and Nuclear Engineering, Bucharest) and Christophe Denis (Pierre & Marie Curie University, Paris). The prize was presented to Professor Scott at the HPC Users’ Meeting in London on 1 December.
The research was focused on improving a suite of two-dimensional R-matrix propagation programs aimed at creating virtual experiments on HPC and Grid architectures to study electron scattering from H-like atoms and ions at intermediate energies. The resulting algorithms are embodied in a new computational strategy that is more accurate and is between one and two orders of magnitude faster than the original implementation. By further exploiting parallelism on HPCx the resulting implementation is up to 350 times faster than the original and 25 times less costly.