Advances in Imaging and Electron Physics, Volume 103

The four chapters that make up this volume are drawn from very different areas. In the first contribution, E. Heyman and T. Melamed examine a complicated problem that arises in the study of wide-band signals.

The second contribution is really a short monograph on a vexed and important question: how should relief be described and represented? J. J. Koenderink and A. J. van Doom, who have made numerous contributions to thinking on this problem, give here a systematic and carefully reasoned study of the various aspects of the topic.

The third chapter being a further contribution by С. M. Krowne on microstrip circulator theory. The appropriate dyadic Green’s functions are explored thoroughly for several designs.

Finally, we have a long account by M. I. Yavor on perturbation methods in electron optics. Several practical systems of great practical importance are examined: sector energy analyzers, Wien filters and several conical designs. The theory is set out fully and the examples are analyzed critically, with the result that designers of such systems should find these studies of direct interest.