The concept of this book was developed during the Winter Seminar held in
the Austrian mountains at the Alpengasthof Zeinisjoch, Tirol-Vorarlberg,
from February 27 to March 3, 1988. Leading experts and advanced students
in math- ematics, physics, chemistry and computer science met to present
and discuss their most recent results in an informal seminar. These were
the circumstances that led to the idea of compiling some of the
essential contributions presented at this seminar together with others
describing basic features of "optimal struc- tures in heterogeneous
reaction systems". The aim of this book is to present the scientific
results of the intensive work carried out in each of the specific fields
of research. Each contribution therefore presents the current state of
the art together with a deeper treatment enabling a more comprehensive
understanding of that particular field of work. The common ideas which
unite all the different contributions are already ex- pressed in the
title of this book. The nature of heterogeneous reaction systems is
quite varied. An example is provided by the chemical systems such as
noble metal particles which may act as heterogeneous catalysts for
gaseous chemical compounds. Under these circumstances the metal
particles and/or their sur- faces may undergo phase transitions during
reaction. Imbihl and Plath report on special catalytic systems of this
kind, which are of industrial importance.