Die Dissertation beschäftigt sich mit Labeling Problemen. Dieses Forschungsgebiet bildet einen wichtigen Teil der strukturellen Mustererkennung, in der die Struktur des zu erkennenden Objektes explizit berücksichtigt wird. Die entwickelte Theorie wird auf die Aufgabe der Stereorekonstruktion angewendet. / The thesis studies the class of labeling problems. This theory contributes to the new stream in pattern recognition in which structure is explicitly taken into account. The developed theory is applied to practical problem of stereo reconstruction.

Tetrahedral meshes are becoming more and more important for geo-modeling applications. The presented work introduces new algorithms for efficient visualization and modeling of tetrahedral meshes. Visualization consists of a generic framework that includes the extraction of geological information like stratigraphic columns, fault block boundaries, simultaneous co-rendering of different attributes and boolean operations of Constructive Solid Geometry with constant complexity. Modeling can be classified into geometric and implicit modeling. Geometric modeling addresses local mesh refinement to increase the numerical resolution of a given mesh. Implicit modeling covers the definition and manipulation of implicitly defined models. A new surface reconstruction method was developed to reconstruct complex, multi-valued surfaces from noisy and sparse data sets as they occur in geological applications. The surface can be bounded and may have discontinuities. Further, this work proposes a new and innovative algorithm for rapid editing of implicitly defined shapes like horizons based on the GeoChron parametrization. The editing is performed interactively on the 3d-volumetric model and geological constraints are respected automatically.

Jörn Sieglerschmidt, Bibliotheksservice-Zentrum Baden Württemberg, Konstanz, führte seine Zuhörer durch die schwierigen Aufgaben bei der Vertextung von Museumsgut, wobei er deutlich machte, dass anders als im Bibliothekswesen die Grenzen zwischen Formal- und Sacherschließung fließend sind: http://titan.bsz-bw.de/cms/museen/musis/publ/sieglerschmidt_freiburg2007.pdf

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Techn. University, Diss., 2003--Darmstadt.

This dissertation addresses the analysis of partially premixed flame configurations and the detection and characterization of their local flame regimes. First, the identification of flame regimes in experimental data is intensively discussed. Current methods for combustion regime characterization, such as the flame index, rely on 3D gradient information that is not accessible with available experimental techniques. Here, a method is proposed for reaction zone detection and characterization, which can be applied to instantaneous 1D Raman/Rayleigh line measurements of major species and temperature as well as to the results of laminar and turbulent flame simulations, without the need for 3D gradient information. Several derived flame markers, namely the mixture fraction, the heat release rate and the chemical explosive mode, are combined to detect and characterize premixed versus non-premixed reaction zones. The methodology is developed and evaluated using fully resolved simulation data from laminar flames. The fully resolved 1D simulation data are spatially filtered to account for the difference in spatial resolution between the experiment and the simulation, and experimental uncertainty is superimposed onto the filtered numerical results to produce Raman/Rayleigh equivalent data. Then, starting from just the temperature and major species, a constrained homogeneous batch reactor calculation gives an approximation of the full thermochemical state at each sample location. Finally, the chemical explosive mode and the heat release rate are calculated from this approximated state and compared to those calculated directly from the simulation data. After successful validation, the approach is applied to Raman/Rayleigh line measurements from laminar counterflow flames, a mildly turbulent lifted flame and turbulent benchmark cases. The results confirm that the reaction zones can be reliably detected and characterized using experimental data. In contrast to other approaches, the presented methodology circumvents uncertainties arising from the use of limited gradient information and offers an alternative to known reaction zone identification methods. Second, this work focuses on the flame structure of partially premixed dimethyl ether (DME) flames. DME flames form significant intermediate hydrocarbons in the reaction zone and are classified as the next more complex fuel candidate in research after methane. To simulate DME combustion processes, accurate predictions by computational combustion models are required. To evaluate such models and to identify appropriate flame regimes, numerical simulations are necessary. Therefore, fully resolved simulations of laminar dimethyl ether flames, defined by different levels of premixing, are performed. Further, the qualitative two-dimensional structures of the partially premixed DME flames are discussed and analyses are carried out at selected slices and compared to each other as well as to experimental data. Further, the flamelet/progress variable (FPV) approach is investigated to predict the partially premixed flame structures of the DME flames. In the context of the FPV approach, a rigorous analysis of the underlying manifold is carried out based on the newly developed regime identification approach and an a priori analysis. The most promising flamelet look-up table is chosen for the fully coupled tabulated chemistry simulations and the results are further compared to the fully resolved simulation data.

Die Dissertation beschäftigt sich mit Labeling Problemen. Dieses Forschungsgebiet bildet einen wichtigen Teil der strukturellen Mustererkennung, in der die Struktur des zu erkennenden Objektes explizit berücksichtigt wird. Die entwickelte Theorie wird auf die Aufgabe der Stereorekonstruktion angewendet. / The thesis studies the class of labeling problems. This theory contributes to the new stream in pattern recognition in which structure is explicitly taken into account. The developed theory is applied to practical problem of stereo reconstruction.

The shape of a tissue or entire organ is important for its biological function. Tissue and organ shapes arise from molecular activities that control and execute cellular processes, such as oriented cell divisions, cell shape changes or cell rearrangements. However, how molecular activities control cellular processes during the shaping of organs is not well understood. This thesis spotlights two aspects of organ shaping based on Drosophila egg chambers as model tissue. One focus lies on three-dimensional imaging of cellular mechanics during development and the other aspect dissects the molecular function of the fat2 gene, that is crucial for tissue elongation in Drosophila egg chambers.:TABLE OF CONTENTS 1 SUMMARY ................................................................................................................... I 2 ZUSAMMENFASSUNG ...............................................................................................III 3 TABLE OF CONTENTS ................................................................................................V 4 LISTS ..........................................................................................................................10 5 INTRODUCTION ........................................................................................................16 6 AIMS OF THE THESIS ...............................................................................................40 7 MATERIALS AND METHODS .....................................................................................41 8 RESULTS ....................................................................................................................58 9 DISCUSSION .............................................................................................................92 10 ACKNOWLEDGEMENTS .......................................................................................103 11 REFERENCES ........................................................................................................105 12 APPENDIX ..............................................................................................................118 13 ERKLÄRUNG ..........................................................................................................123

During the last decade ferroelectrics based on doped hafnium oxide emerged as promising candidates for realization of ultra-low-power non-volatile memories. Two spontaneous polarization states occurring in the material that can be altered by applying electrical fields rather than forcing a current through and the materials compatibility to CMOS processing are the main benefits setting the concept apart from other emerging memories. 1T1C ferroelectric random access memories (FeRAM) as well as 1T FeFET concepts are under investigation. In this article the application of hafnium based ferroelectric memories in different flavours and their ranking in the memory landscape are discussed.