Browsing by Author "Fischer, Thomas"

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    Brennpunkt Wavelets
    (1997) Fischer, Thomas; Haase, Maria
    Im multimedialen Zeitalter müssen immer größere Datenmengen analysiert, gespeichert und übertragen werden. Um Engpässe oder gar Staus auf den Daten Highways zu vermeiden, wird es zunehmend wichtiger, den Datentransfer über das Netz - insbesondere von Bildern - möglichst schnell und kostengünstig durchzuführen. Software-Hersteller und Online-Anbieter versuchen folgerichtig, effiziente, der Anwendung angepaßte, Kompressionstechniken bereitzustellen, die die Information möglichst dichtgepackt übertragen. Im Wettstreit zwischenden verschiedenen Kompressionsverfahren gewinnen Wavelet-Algorithmen immer mehr an Bedeutung.
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    GeomInt : geomechanical integrity of host and barrier rocks : experiments, models and analysis of discontinuities
    (2021) Kolditz, Olaf; Fischer, Thomas; Frühwirt, Thomas; Görke, Uwe-Jens; Helbig, Carolin; Konietzky, Heinz; Maßmann, Jobst; Nest, Mathias; Pötschke, Daniel; Rink, Karsten; Sattari, Amir; Schmidt, Patrick; Steeb, Holger; Wuttke, Frank; Yoshioka, Keita; Vowinckel, Bernhard; Ziefle, Gesa; Nagel, Thomas
    The present paper gives an overview of the GeomInt project “Geomechanical integrity of host and barrier rocks - experiment, modelling and analysis of discontinuities” which has been conducted from 2017–2020 within the framework of the “Geo:N Geosciences for Sustainability” program. The research concept of the collaborative project is briefly introduced followed by a summary of the most important outcomes. The research concept puts geological discontinuities into the centre of investigations- as these belong to the most interesting and critical elements for any subsurface utilisation. Thus, while research questions are specific, they bear relevance to a wide range of applications. The specific research is thus integrated into a generic concept in order to make the results more generally applicable and transferable. The generic part includes a variety of conceptual approaches and their numerical realisations for describing the evolution of discontinuities in the most important types of barrier rocks. An explicit validation concept for the generic framework was developed and realised by specific “model-experiment-exercises” (MEX) which combined experiments and models in a systematic way from the very beginning. 16 MEX have been developed which cover a wide range of fundamental fracturing mechanisms, i.e. swelling/shrinkage, fluid percolation, and stress redistribution processes. The progress in model development is also demonstrated by field-scale applications, e.g. in the analysis and design of experiments in underground research laboratories in Opalinus Clay (URL Mont Terri, Switzerland) and salt rock (research mine Springen, Germany).