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This thesis deals with algorithmic local and global techniques in the qualitative analysis of autonomous parametric dynamical systems. Specifically, algorithms for symbolic parametric investigations of the existence of limit cycles are developed and investigated and applied to several applications, especially from life science informatics.In order to investigate the global question of the absence of oscillations some generalizations of the classical Bendixson-Dulac criterion, which is asufficient criterion for the exclusion of limit cycles only, to higher dimensions are made algorithmic.

Amorphous chalcogenide glasses have great interesting due to their wide range of applications such as solar cells, photo detectors, photo diodes, imagining and xerography. As-Sb-Se-Te thin films were prepared by thermal evaporation method. The addition of Te content were found to affect the optical, electrical and photo electrical properties. The influence of incorporation of Te in (As-Sb-Se-Te) system results in an increase of the bulk density and molar volume while the coordination number, the average heat of atomization and cohesive energy decrease. The effect of Te content on the steady...