TY - JOUR A1 - Höllerer, Tobias A1 - Tönnies, Klaus A1 - Hege, Hans-Christian A1 - Stalling, Detlev T1 - Der Einfluß der Datenapproximation bei Volume Rendering durch ein Emissions/Absorptions-Modell JF - Visualisierung - Dynamik und Komplexität Y1 - 1995 PB - CEVIS Universität Bremen und Fachgruppe 4.2.1 der Gesellschaft für Informatik CY - Bremen, Germany ER - TY - CHAP A1 - Stalling, Detlev A1 - Hege, Hans-Christian T1 - Fast and Resolution-Independent Line Integral Convolution T2 - Proceedings of SIGGRAPH ’95 Y1 - 1995 U6 - https://doi.org/10.1145/218380.218448 SP - 249 EP - 256 PB - Computer Graphics Annual Conference Series, ACM SIGGRAPH CY - Los Angeles, California ER - TY - JOUR A1 - Hege, Hans-Christian T1 - Scaling study of pure SU(3) theory - the QCD-TARO collaboration JF - Nucl. Phys. B Proc. Suppl. Y1 - 1994 U6 - https://doi.org/10.1016/0920-5632(94)90358-1 VL - 34 SP - 246 EP - 252 ER - TY - JOUR A1 - Hashimoto, T. A1 - Hege, Hans-Christian T1 - QCD on the Massively Parallel Computer AP 1000 JF - Int. J. Mod. Phys. Y1 - 1993 U6 - https://doi.org/10.1142/S0129183193000975 VL - 4 IS - 6 SP - 1233 EP - 1253 ER - TY - JOUR A1 - Hashimoto, T. A1 - Hege, Hans-Christian T1 - Autocorrelation in Updating Pure SU(3) Lattice Gauge Theory by the Use of Overrelaxed Algorithms JF - Nucl. Phys. B Proc. Suppl. Y1 - 1993 U6 - https://doi.org/10.1016/0920-5632(93)90202-H VL - 30 SP - 253 EP - 256 ER - TY - JOUR A1 - Hashimoto, T. A1 - Hege, Hans-Christian T1 - Study of Spatial Size Effects in Quenched Wilson Hadron Spectroscopy at beta = 6.3 JF - Nucl. Phys. B Proc. Suppl. Y1 - 1993 U6 - https://doi.org/10.1016/0920-5632(93)90230-4 VL - 30 SP - 373 EP - 376 ER - TY - JOUR A1 - Hashimoto, T. A1 - Hege, Hans-Christian T1 - Monte Carlo Renormalization Study at Large beta in the Confinement Region JF - Nuclear Phys. B. Proc. Suppl. Y1 - 1993 U6 - https://doi.org/10.1016/0920-5632(93)90263-6 VL - 30 SP - 517 EP - 520 ER - TY - GEN A1 - Wunderling, Roland A1 - Hege, Hans-Christian T1 - AGIL - the Adaptable Graphical Interface Layer, Programmierer-Handbuch Y1 - 1992 SP - 34pp. PB - Interner Report, Konrad-Zuse-Zentrum für Informationstechnik Berlin (ZIB), Germany ER - TY - JOUR A1 - Hege, Hans-Christian A1 - Knecht, Renate T1 - Conference Report: Parallel Computing 91 JF - Parallel Computing Y1 - 1992 VL - 18 IS - 4 SP - 473 EP - 476 ER - TY - JOUR A1 - Hashimoto, T. A1 - Hege, Hans-Christian T1 - Hadron Spectroscopy on a 32^3 * 48 Lattice JF - Nucl. Phys. B Proc. Suppl. 26 Y1 - 1992 U6 - https://doi.org/10.1016/0920-5632(92)90257-S SP - 293 EP - 295 ER - TY - CHAP A1 - Dercksen, Vincent J. A1 - Egger, Robert A1 - Hege, Hans-Christian A1 - Oberlaender, Marcel T1 - Synaptic Connectivity in Anatomically Realistic Neural Networks: Modeling and Visual Analysis T2 - Eurographics Workshop on Visual Computing for Biology and Medicine (VCBM) Y1 - 2012 U6 - https://doi.org/10.2312/VCBM/VCBM12/017-024 SP - 17 EP - 24 CY - Norrköping, Sweden ER - TY - GEN A1 - Pfister, Hanspeter A1 - Kaynig, Verena A1 - Botha, Charl A1 - Bruckner, Stefan A1 - Dercksen, Vincent J. A1 - Hege, Hans-Christian A1 - Roerdink, Jos T1 - Visualization in Connectomics Y1 - 2012 U6 - https://doi.org/10.1007/978-1-4471-6497-5_21 ER - TY - JOUR A1 - Weber, Britta A1 - Greenan, Garrett A1 - Prohaska, Steffen A1 - Baum, Daniel A1 - Hege, Hans-Christian A1 - Müller-Reichert, Thomas A1 - Hyman, Anthony A1 - Verbavatz, Jean-Marc T1 - Automated tracing of microtubules in electron tomograms of plastic embedded samples of Caenorhabditis elegans embryos JF - Journal of Structural Biology Y1 - 2012 UR - http://www.sciencedirect.com/science/article/pii/S1047847711003509 U6 - https://doi.org/10.1016/j.jsb.2011.12.004 VL - 178 IS - 2 SP - 129 EP - 138 ER - TY - JOUR A1 - Kasten, Jens A1 - Reininghaus, Jan A1 - Hotz, Ingrid A1 - Hege, Hans-Christian T1 - Two-Dimensional Time-Dependent Vortex Regions Based on the Acceleration Magnitude JF - IEEE Transactions on Visualization and Computer Graphics Y1 - 2011 VL - 17 IS - 12 SP - 2080 EP - 2087target ER - TY - JOUR A1 - Lindow, Norbert A1 - Baum, Daniel A1 - Hege, Hans-Christian T1 - Voronoi-Based Extraction and Visualization of Molecular Paths JF - IEEE Transactions on Visualization and Computer Graphics Y1 - 2011 U6 - https://doi.org/10.1109/TVCG.2011.259 VL - 17 IS - 12 SP - 2025 EP - 2034 ER - TY - JOUR A1 - Lacarelle, Arnaud A1 - P. Moeck, Jonas A1 - Paschereit, Christian A1 - Gelbert, Gregor A1 - King, Rudibert A1 - M. Luchtenburg, Dirk A1 - Noack, Bernd R. A1 - Kasten, Jens A1 - Hege, Hans-Christian T1 - Modeling a Fuel/Air Mixing to Control the Pressure Pulsations and NOx Emissions in a Lean Premixed Combustor JF - Active Flow Control II Y1 - 2010 U6 - https://doi.org/10.1007/978-3-642-11735-0_20 VL - 108 SP - 307 EP - 321 PB - Springer, Berlin ER - TY - JOUR A1 - Lindow, Norbert A1 - Baum, Daniel A1 - Prohaska, Steffen A1 - Hege, Hans-Christian T1 - Accelerated Visualization of Dynamic Molecular Surfaces JF - Comput. Graph. Forum Y1 - 2010 U6 - https://doi.org/10.1111/j.1467-8659.2009.01693.x VL - 29 SP - 943 EP - 952 ER - TY - CHAP A1 - Reininghaus, Jan A1 - Günther, David A1 - Hotz, Ingrid A1 - Prohaska, Steffen A1 - Hege, Hans-Christian T1 - TADD: A Computational Framework for Data Analysis Using Discrete Morse Theory T2 - Mathematical Software - ICMS 2010 Y1 - 2010 U6 - https://doi.org/10.1007/978-3-642-15582-6_35 VL - 6327 SP - 198 EP - 208 PB - Springer ER - TY - JOUR A1 - Rybak, Jürgen A1 - Kuß, Anja A1 - Lamecker, Hans A1 - Zachow, Stefan A1 - Hege, Hans-Christian A1 - Lienhard, Matthias A1 - Singer, Jochen A1 - Neubert, Kerstin A1 - Menzel, Randolf T1 - The Digital Bee Brain: Integrating and Managing Neurons in a Common 3D Reference System JF - Front. Syst. Neurosci. Y1 - 2010 U6 - https://doi.org/10.3389/fnsys.2010.00030 VL - 4 IS - 30 ER - TY - CHAP A1 - Kasten, Jens A1 - Weinkauf, Tino A1 - Petz, Christoph A1 - Hotz, Ingrid A1 - Noack, Bernd R. A1 - Hege, Hans-Christian T1 - Extraction of Coherent Structures from Natural and Actuated Flows T2 - Active Flow Control II Y1 - 2010 SN - 978-3-642-11734-3 U6 - https://doi.org/10.1007/978-3-642-11735-0_24 VL - 108 SP - 373 EP - 387 PB - Springer, Berlin ER - TY - JOUR A1 - Otto, Mathias A1 - Germer, Tobias A1 - Hege, Hans-Christian A1 - Theisel, Holger T1 - Uncertain 2D Vector Field Topology JF - Comput. Graph. Forum Y1 - 2010 U6 - https://doi.org/10.1111/j.1467-8659.2009.01604.x VL - 29 SP - 347 EP - 356 ER - TY - JOUR A1 - Goubergrits, Leonid A1 - Thamsen, Bente A1 - Berthe, André A1 - Poethke, Jens A1 - Kertzscher, Ulrich A1 - Affeld, Klaus A1 - Petz, Christoph A1 - Hege, Hans-Christian A1 - Hoch, Heinrich A1 - Spuler, Andreas T1 - In Vitro Study of Near-Wall Flow in a Cerebral Aneurysm Model with and without Coils JF - American Journal of Neuroradiology Y1 - 2010 U6 - https://doi.org/10.3174/ajnr.A2121 VL - 31:8 SP - 1521 EP - 1528 ER - TY - JOUR A1 - Hege, Hans-Christian A1 - Laidlaw, David A1 - Machiraju, Raghu T1 - Guest Editor's Introduction: Special Section on Volume Graphics and Point-Based Graphics JF - IEEE Trans. Vis. Comput. Graph. Y1 - 2010 U6 - https://doi.org/10.1109/TVCG.2010.72 VL - 16 IS - 4 SP - 531 EP - 532 ER - TY - JOUR A1 - Lindow, Norbert A1 - Baum, Daniel A1 - Bondar, Ana-Nicoleta A1 - Hege, Hans-Christian T1 - Exploring cavity dynamics in biomolecular systems JF - BMC Bioinformatics Y1 - 2013 U6 - https://doi.org/10.1186/1471-2105-14-S19-S5 VL - 14 ET - (Suppl 19):S5 ER - TY - JOUR A1 - Pöthkow, Kai A1 - Petz, Christoph A1 - Hege, Hans-Christian T1 - Approximate Level-Crossing Probabilities for Interactive Visualization of Uncertain Isocontours JF - International Journal for Uncertainty Quantification Y1 - 2013 U6 - https://doi.org/10.1615/Int.J.UncertaintyQuantification.2012003958 VL - 3 IS - 2 SP - 101 EP - 117 ER - TY - GEN A1 - Homberg, Ulrike A1 - Baum, Daniel A1 - Wiebel, Alexander A1 - Prohaska, Steffen A1 - Hege, Hans-Christian ED - Bremer, Peer-Timo ED - Hotz, Ingrid ED - Pascucci, Valerio ED - Peikert, Ronald T1 - Definition, Extraction, and Validation of Pore Structures in Porous Materials BT - Theory, Algorithms, and Applications T2 - Topological Methods in Data Analysis and Visualization III Y1 - 2014 U6 - https://doi.org/10.1007/978-3-319-04099-8_15 SP - 235 EP - 248 PB - Springer ER - TY - CHAP A1 - Rosanwo, Olufemi A1 - Petz, Christoph A1 - Prohaska, Steffen A1 - Hotz, Ingrid A1 - Hege, Hans-Christian ED - Eades, Peter ED - Ertl, Thomas ED - Shen, Han-Wei T1 - Dual Streamline Seeding T2 - Proceedings of the IEEE Pacific Visualization Symposium Y1 - 2009 SP - 9 EP - 16 CY - Beijing, China ER - TY - CHAP A1 - Rybak, Jürgen A1 - Kuß, Anja A1 - Holler, Wolfgang A1 - Brandt, Robert A1 - Hege, Hans-Christian A1 - Menzel, Randolf T1 - The HoneyBee Standard Brain (HSB) - a versatile atlas tool for integrating data and data exchange in the neuroscience community T2 - BMC Neuroscience Y1 - 2009 U6 - https://doi.org/10.1186/1471-2202-10-S1-P1 VL - 10 (Suppl 1):P1 ER - TY - JOUR A1 - Oberlaender, Marcel A1 - Dercksen, Vincent J. A1 - Egger, Robert A1 - Gensel, Maria A1 - Sakmann, Bert A1 - Hege, Hans-Christian T1 - Automated three-dimensional detection and counting of neuron somata JF - Journal of Neuroscience Methods Y1 - 2009 U6 - https://doi.org/10.1016/j.jneumeth.2009.03.008 VL - 180 IS - 1 SP - 147 EP - 160 ER - TY - JOUR A1 - Goubergrits, Leonid A1 - Weber, Sarah A1 - Petz, Christoph A1 - Spuler, Andreas A1 - Pöthke, Jens A1 - Berthe, André A1 - Hege, Hans-Christian T1 - Wall-PIV as a Near Wall Flow Validation Tool for CFD JF - Journal of Visualization Y1 - 2009 VL - 12 IS - 3 SP - 241 EP - 250 ER - TY - JOUR A1 - Goubergrits, Leonid A1 - Wellnhofer, Ernst A1 - Kertzscher, Ulrich A1 - Affeld, Klaus A1 - Petz, Christoph A1 - Hege, Hans-Christian T1 - Coronary Artery WSS Profiling Using a Geometry Reconstruction Based on Biplane Angiography JF - Annals of Biomedical Engineering Y1 - 2009 U6 - https://doi.org/s10439-009-9656-7 VL - 37 IS - 4 SP - 682 EP - 691 PB - Springer ER - TY - BOOK A1 - Hege, Hans-Christian A1 - (Eds.), Konrad T1 - Mathematical Visualization - Algorithms, Applications, and Numerics Y1 - 1998 SN - ISBN 3-540-63991-8 PB - Springer CY - Heidelberg ER - TY - BOOK A1 - Hege, Hans-Christian A1 - Polthier, Konrad T1 - VideoMath - Festival at ICM 98 T3 - Springer VideoMath Y1 - 1998 SN - 978-3-540-21385-7 ER - TY - JOUR A1 - Cournia, Zoe A1 - Allen, Toby W. A1 - Andricioaei, Ioan A1 - Antonny, Bruno A1 - Baum, Daniel A1 - Brannigan, Grace A1 - Buchete, Nicolae-Viorel A1 - Deckman, Jason T. A1 - Delemotte, Lucie A1 - del Val, Coral A1 - Friedman, Ran A1 - Gkeka, Paraskevi A1 - Hege, Hans-Christian A1 - Hénin, Jérôme A1 - Kasimova, Marina A. A1 - Kolocouris, Antonios A1 - Klein, Michael L. A1 - Khalid, Syma A1 - Lemieux, Joanne A1 - Lindow, Norbert A1 - Roy, Mahua A1 - Selent, Jana A1 - Tarek, Mounir A1 - Tofoleanu, Florentina A1 - Vanni, Stefano A1 - Urban, Sinisa A1 - Wales, David J. A1 - Smith, Jeremy C. A1 - Bondar, Ana-Nicoleta T1 - Membrane Protein Structure, Function and Dynamics: A Perspective from Experiments and Theory JF - Journal of Membrane Biology Y1 - 2015 U6 - https://doi.org/10.1007/s00232-015-9802-0 VL - 248 IS - 4 SP - 611 EP - 640 ER - TY - JOUR A1 - Mücklich, Frank A1 - Webel, Johannes A1 - Aboulfadl, Hisham A1 - Lindow, Norbert A1 - Hege, Hans-Christian T1 - Correlative Tomography – Extraction of Reliable Information with Adequate Resolution from mm Scale Down to Sub-nm Scale JF - Microsc. Microanal. Y1 - 2014 U6 - https://doi.org/10.1017/S1431927614005911 VL - 20 IS - Suppl 3 SP - 838 EP - 839 ER - TY - CHAP A1 - Engelke, Wito A1 - Kuhn, Alexander A1 - Flatken, Markus A1 - Chen, Fang A1 - Hege, Hans-Christian A1 - Gerndt, Andreas A1 - Hotz, Ingrid T1 - Atmospheric Impact of Volcano Eruptions T2 - Proceedings IEEE SciVis 2014 N2 - The analysis of data that captures volcanic eruptions and their atmospheric aftermath plays an important role for domain experts to gain a deeper understanding of the volcanic eruption and their consequences for atmosphere, climate and air traffic. Thereby, one major challenge is to extract and combine the essential information, which is spread over various, mostly sparse data sources. This requires a careful integration of each data set with its strength and limitations. The sparse, but more reliable measurement data is mainly used to calibrate the more dense simulation data. This work combines a collection of visualization approaches into an exploitative framework. The goal is to support the domain experts to build a complete picture of the situation. But it is also important to understand the individual data sources, the wealth of their information and the quality of the simulation results. All presented methods are designed for direct interaction with the data from different perspectives rather than the sole generation of some final images. Y1 - 2014 ER - TY - GEN A1 - Deuflhard, Peter A1 - Hege, Hans-Christian ED - Lepper, Verena ED - Deuflhard, Peter ED - Markschies, Christoph T1 - Raumtiefe in Malerei und Computergrafik T2 - Räume - Bilder - Kulturen N2 - Einführung: Die Tiefenwirkung dreidimensionaler Räume in einem zweidimensionalen Bild einzufangen, ist ein Faszinosum nahezu aller Kulturen der Menschheitsgeschichte. Der vorliegende Aufsatz folgt den Spuren dieses Faszinosums, vergleichend in der Malerei und der mathematisierten Computergrafik. Die Entdeckung der Zentralperspektive in der italienischen Renaissance zeigt bereits den engen Zusammenhang von Malerei und Mathematik. Auf der Suche nach Maltechniken, mit denen Raumtiefe bildnerisch dargestellt werden kann, beginnen wir in Kap. 2 mit einem chronologischen Gang durch verschiedene Epochen der europäischen Malerei. Hieraus abgeleitete Prinzipien, soweit sie im Rechner realisierbar scheinen, stellen wir in Kap. 3 am Beispiel moderner Methoden der mathematischen Visualisierung vor. Y1 - 2015 SN - 978-3-11-035993-0 SP - 33 EP - 46 PB - Walter De Gruyter ER - TY - JOUR A1 - Kasten, Jens A1 - Reininghaus, Jan A1 - Hotz, Ingrid A1 - Hege, Hans-Christian A1 - Noack, Bernd A1 - Daviller, Guillaume A1 - Morzyński, Marek T1 - Acceleration feature points of unsteady shear flows JF - Archives of Mechanics N2 - A framework is proposed for extracting features in 2D transient flows, based on the acceleration field to ensure Galilean invariance. The minima of the acceleration magnitude, i.e. a superset of the acceleration zeros, are extracted and discriminated into vortices and saddle points --- based on the spectral properties of the velocity Jacobian. The extraction of topological features is performed with purely combinatorial algorithms from discrete computational topology. The feature points are prioritized with persistence, as a physically meaningful importance measure. These features are tracked in time with a robust algorithm for tracking features. Thus a space-time hierarchy of the minima is built and vortex merging events are detected. The acceleration feature extraction strategy is applied to three two-dimensional shear flows: (1) an incompressible periodic cylinder wake, (2) an incompressible planar mixing layer and (3) a weakly compressible planar jet. The vortex-like acceleration feature points are shown to be well aligned with acceleration zeros, maxima of the vorticity magnitude, minima of pressure field and minima of λ2. Y1 - 2016 VL - 68 IS - 1 SP - 55 EP - 80 ER - TY - CHAP A1 - Agudo Jácome, Leonardo A1 - Hege, Hans-Christian A1 - Paetsch, Olaf A1 - Pöthkow, Kai T1 - 3D Reconstruction, Visualization and Quantification of Dislocations from Transmission Electron Microscopy Stereo-Pairs T2 - Microscopy and Microanalysis 2016, July 24-28 Columbus, Ohio Y1 - 2016 UR - https://www.microscopy.org/MandM/2016/program/abstracts/PDP-57.pdf ER - TY - CHAP A1 - Kuhn, Alexander A1 - Engelke, Wito A1 - Flatken, Markus A1 - Hege, Hans-Christian A1 - Hotz, Ingrid T1 - Topology-based Analysis for Multimodal Atmospheric Data of Volcano Eruptions T2 - Topological Methods in Data Analysis and Visualization IV Y1 - 2017 U6 - https://doi.org/10.1007/978-3-319-44684-4_2 SP - 35 EP - 50 PB - Springer CY - Cham, Schweiz ER - TY - JOUR A1 - Günther, Tobias A1 - Kuhn, Alexander A1 - Hege, Hans-Christian A1 - Theisel, Holger T1 - MCFTLE: Monte Carlo Rendering of Finite-Time Lyapunov Exponent Fields JF - Computer Graphics Forum Y1 - 2016 U6 - https://doi.org/10.1111/cgf.12914 N1 - By mistake the fourth author Hans-Christian Hege has been ommitted in the journal publication VL - 35 IS - 3 SP - 381 EP - 390 ER - TY - CHAP A1 - Sagnol, Guillaume A1 - Hege, Hans-Christian A1 - Weiser, Martin T1 - Using sparse kernels to design computer experiments with tunable precision T2 - 22nd Intern. Conf. on Computational Statistics - COMPSTAT 2016, Oviedo, Spain, 23-26 August 2016, Proceedings ISBN 978-90-73592-36-0 Y1 - 2016 SP - 397 EP - 408 ER - TY - CHAP A1 - Baum, Daniel A1 - Mahlow, Kristin A1 - Lamecker, Hans A1 - Zachow, Stefan A1 - Müller, Johannes A1 - Hege, Hans-Christian T1 - The Potential of Surface-based Geometric Morphometrics for Evolutionary Studies: An Example using Dwarf Snakes (Eirenis) T2 - Abstract in DigitalSpecimen 2014 N2 - Geometric morphometrics plays an important role in evolutionary studies. The state-of-the-art in this field are landmark-based methods. Since the landmarks usually need to be placed manually, only a limited number of landmarks are generally used to represent the shape of an anatomical structure. As a result, shape characteristics that cannot be properly represented by small sets of landmarks are disregarded. In this study, we present a method that is free of this limitation. The method takes into account the whole shape of an anatomical structure, which is represented as a surface, hence the term ‘surface-based morphometrics’. Correspondence between two surfaces is established by defining a partitioning of the surfaces into homologous surface patches. The first step for the generation of a surface partitioning is to place landmarks on the surface. Subsequently, the landmarks are connected by curves lying on the surface. The curves, called ‘surface paths’, might either follow specific anatomical features or they can be geodesics, that is, shortest paths on the surface. One important requirement, however, is that the resulting surface path networks are topologically equivalent across all surfaces. Once the surface path networks have been defined, the surfaces are decomposed into patches according to the path networks. This approach has several advantages. One of them is that we can discretize the surface by as many points as desired. Thus, even fine shape details can be resolved if this is of interest for the study. Since a point discretization is used, another advantage is that well-established analysis methods for landmark-based morphometrics can be utilized. Finally, the shapes can be easily morphed into one another, thereby greatly supporting the understanding of shape changes across all considered specimens. To show the potential of the described method for evolutionary studies of biological specimens, we applied the method to the para-basisphenoid complex of the snake genus Eirenis. By using this anatomical structure as example, we present all the steps that are necessary for surface-based morphometrics, including the segmentation of the para-basisphenoid complex from micro-CT data sets. We also show some first results using statistical analysis as well as classification methods based on the presented technique. Y1 - 2014 ER - TY - GEN A1 - Günther, Tobias A1 - Kuhn, Alexander A1 - Hege, Hans-Christian A1 - Gross, Markus A1 - Theisel, Holger T1 - Progressive Monte-Carlo Rendering of Atmospheric Flow Features Across Scales T2 - 69th Annual Meeting of the APS Division of Fluid Dynamics, Gallery of Fluid Motion, Nov 20-22, 2016, Portland, OR, USA. N2 - To improve existing weather prediction and reanalysis capabilities, high-resolution and multi-modal climate data becomes an increasingly important topic. The advent of increasingly dense numerical simulation of atmospheric phenomena, provides new means to better understand dynamic processes and to visualize structural flow patterns that remain hidden otherwise. In the presented illustrations we demonstrate an advanced technique to visualize multiple scales of dense flow fields and Lagrangian patterns therein, simulated by state-of-the-art simulation models for each scale. They provide a deeper insight into the structural differences and patterns that occur on each scale and highlight the complexity of flow phenomena in our atmosphere. Y1 - 2016 U6 - https://doi.org/10.1103/APS.DFD.2016.GFM.P0030 ER - TY - CHAP A1 - Arlt, Tobias A1 - Lindow, Norbert A1 - Baum, Daniel A1 - Hilger, Andre A1 - Mahnke, Ingo A1 - Hege, Hans-Christian A1 - Lepper, Verena A1 - Siopi, Tzulia A1 - Mahnke, Heinz.Eberhard T1 - Virtual Access to Hidden Texts – Study of Ancient Papyri T2 - Eighth Joint BER II and BESSY II User Meeting, Dec 7-9, 2016, Berlin, Germany N2 - When physical unfolding/unrolling of papyri is not possible or too dangerous for preserving the precious object, tomographic approaches may be the ap- propriate alternative. Requirements are the resolution and the contrast to distinguish writing and substrate. The steps to be performed are the following: (1) Select the object of interest (archaeological arguments, cultural back- ground of the object, etc.). (2) Find the proper physical procedure, especially with respect to contrast, take the tomographic data, e.g. by absorption x-ray tomography. (3) Apply mathematical unfolding transformations to the tomographic data, in order to obtain a 2d-planar reconstruction of text. Y1 - 2016 ER - TY - CHAP A1 - Kuhn, Alexander A1 - Hege, Hans-Christian T1 - Object-based visualization and evaluation of cloud-resolving simulations T2 - Book of Abstracts, SCCS 2017 – Scaling Cascades in Complex Systems, Mar 27-29, 2017, Berlin, Germany N2 - Recent advances in high-resolution, cloud resolving simulation models pose several challenges towards respective analysis methodologies. To enable efficient comparison and validation of such models efficient, scalable, and informative diagnostic procedures are mandatory. In this talk, an object-based evaluation scheme based on the notion of scalar field topology will be presented. The presentation will cover the application of topological clustering procedures for object identification, tracking, and the retrieval of object-based statistics. The pro-posed methodology is shown to enable an advanced in-depth evaluation and visualization of high cloud-resolving models. Using a newly developed large-scale high-resolution model (i.e., HD(CP)2 ICON), it will be demonstrated that the presented procedures are applicable to assess the model performance compared to measurements (e.g., radar, satellite) and standard operational models (COSMO) at different domains and spatial scales. Y1 - 2017 ER - TY - GEN A1 - Polthier, Konrad A1 - Sullivan, John A1 - Ziegler, Günter M. A1 - Hege, Hans-Christian ED - Deuflhard, Peter ED - et al., T1 - Visualization T2 - MATHEON - Mathematics for Key Technologies Y1 - 2014 SN - 978-3-03719-137-8 U6 - https://doi.org/10.4171/137 SP - 335 EP - 339 PB - European Mathematical Society ER - TY - GEN A1 - Lamecker, Hans A1 - Hege, Hans-Christian A1 - Tabelow, Karsten A1 - Polzehl, Jörg ED - Deuflhard, Peter ED - et al., T1 - Image Processing T2 - MATHEON - Mathematics for Key Technologies Y1 - 2014 U6 - https://doi.org/10.4171/137 SP - 359 EP - 376 PB - European Mathematical Society ER - TY - JOUR A1 - Kramer, Tobias A1 - Noack, Matthias A1 - Baum, Daniel A1 - Hege, Hans-Christian A1 - Heller, Eric J. T1 - Dust and gas emission from cometary nuclei: the case of comet 67P/Churyumov-Gerasimenko JF - Advances in Physics: X N2 - Comets display with decreasing solar distance an increased emission of gas and dust particles, leading to the formation of the coma and tail. Spacecraft missions provide insight in the temporal and spatial variations of the dust and gas sources located on the cometary nucleus. For the case of comet 67P/Churyumov-Gerasimenko (67P/C-G), the long-term obser- vations from the Rosetta mission point to a homogeneous dust emission across the entire illuminated surface. Despite the homogeneous initial dis- tribution, a collimation in jet-like structures becomes visible. We propose that this observation is linked directly to the complex shape of the nucleus and projects concave topographical features into the dust coma. To test this hypothesis, we put forward a gas-dust description of 67P/C-G, where gravitational and gas forces are accurately determined from the surface mesh and the rotation of the nucleus is fully incorporated. The emerging jet-like structures persist for a wide range of gas-dust interactions and show a dust velocity dependent bending. Y1 - 2018 U6 - https://doi.org/10.1080/23746149.2017.1404436 VL - 3 IS - 1 SP - 1404436 ER - TY - CHAP A1 - Sakurai, Daisuke A1 - Hege, Hans-Christian A1 - Kuhn, Alexander A1 - Rust, Henning A1 - Kern, Bastian A1 - Breitkopf, Tom-Lukas T1 - An Application-Oriented Framework for Feature Tracking in Atmospheric Sciences T2 - Proceedings of 2017 IEEE 7th Symposium on Large Data Analysis and Visualization (LDAV) N2 - In atmospheric sciences, sizes of data sets grow continuously due to increasing resolutions. A central task is the comparison of spatiotemporal fields, to assess different simulations and to compare simulations with observations. A significant information reduction is possible by focusing on geometric-topological features of the fields or on derived meteorological objects. Due to the huge size of the data sets, spatial features have to be extracted in time slices and traced over time. Fields with chaotic component, i.e. without 1:1 spatiotemporal correspondences, can be compared by looking upon statistics of feature properties. Feature extraction, however, requires a clear mathematical definition of the features - which many meteorological objects still lack. Traditionally, object extractions are often heuristic, defined only by implemented algorithms, and thus are not comparable. This work surveys our framework designed for efficient development of feature tracking methods and for testing new feature definitions. The framework supports well-established visualization practices and is being used by atmospheric researchers to diagnose and compare data. Y1 - 2017 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:0297-zib-66685 SP - 96 EP - 97 ER -