The GAMM Committee for Scientific Computing organizes workshops on subjects in Scientific Computing. These workshops are intended to bring researchers from engineering application and mathematical theory together, to provide a platform for discussion and scientific exchange and to further new research fields. st The series of such workshops was continued in 1995, October 12-13, with the 1 GAMM-Seminar at ICA Stuttgart on the special topic "Modelling and Computation in Environmental Sciences" at the Institute for Computer Applications, Universitiy of Stuttgart. The seminar was attended by 75...

Chemical reaction systems of practical interest are usually very complex: They consist of a large number of elementary reactions (hundreds or thou sands in a small system), mostly with rate coefficients differing by many orders of magnitude, which leads to serious stiffness, and they are often coupled with surface reaction steps and convective or diffusive processes. Thus, the derivation of a "true" chemical mechanism can be extremely cumbersome. In most cases this is done by setting up "reaction models" which are improved step by step using, for example, perturbation theory, numerical...