S. van der Veen, Een Spaanse Groninger in Marokko. De levens van Jan Willem Ripperda (1682-1737)

Multichannel Interference Mitigation Techniques in Radio Astronomy Amir Leshem and Alle-jan Van Der Veen

Radio-astronomical observations are increasingly corrupted by radio frequency interference, and on-line detection and Ðltering algorithms are becoming essential. To facilitate the introduction of such techniques into radio astronomy, we formulate the astronomical problem in an array signal processing language and give an introduction to some elementary algorithms from that Ðeld. We consider two...

Jan A . van Gils Matthijs van der Geest Jutta Leyrer

A Schur Method for Low-rank Matrix Approximation∗ Alle-jan Van Der Veen

The usual way to compute a low-rank approximant of a matrix H is to take its singular value decomposition (SVD) and truncate it by setting the small singular values equal to 0. However, the SVD is computationally expensive. This paper describes a much simpler generalized Schur-type algorithm to compute similar low-rank approximants. For a given matrix H which has d singular values larger than ε...

Obituary for Jan Valentyn van der Merwe

Professor Jan Valentyn Van der Merwe passed away on Friday, 25 September, at the age of 71. Prof Jan’s illustrious career began after he completed a research fellowship at Duke University in the USA, and returned to South Africa as Head of the Department of Obstetrics and Gynaecology at Pretoria University. In this role, Prof Jan pioneered the establishment of an assisted reproduction unit in S...

Jan van der Noordaa (1934–2015);A Virologist Pur Sang

Our loyal friend and colleague, Jan van der Noordaa, passed away unexpectedly at the age of 80 on the evening of 17 June 2015. [...].