TY - BOOK A1 - Donner, Reik Volker A1 - Cser, Adrienn A1 - Schwarz, Udo A1 - Otto, Andreas H. A1 - Feudel, Ulrike T1 - An approach to a process model of laser beam melt ablation using methods of linear and non-linear data analysis N2 - As a non-contact process laser beam melt ablation offers several advantages compared to conventional processing mechanisms. During ablation the surface of the workpiece is molten by the energy of a CO2-laser beam, this melt is then driven out by the impulse of an additional process gas. Although the idea behind laser beam melt ablation is rather simple, the process itself has a major limitation in practical applications: with increasing ablation rate surface quality of the workpiece processed declines rapidly. With different ablation rates different surface structures can be distinguished, which can be characterised by suitable surface parameters. The corresponding regimes of pattern formation are found in linear and non-linear statistical properties of the recorded process emissions as well. While the ablation rate can be represented in terms of the line-energy, this parameter does not provide sufficient information about the full behaviour of the system. The dynamics of the system is dominated by oscillations due to the laser cycle but includes some periodically driven non-linear processes as well. Upon the basis of the measured time series, a corresponding model is developed. The deeper understanding of the process can be used to develop strategies for a process control. Y1 - 2004 SN - 3-527-40430-9 ER - TY - BOOK A1 - Donner, Reik Volker A1 - Cser, Adrienn A1 - Schwarz, Udo A1 - Otto, Andreas H. A1 - Feudel, Ulrike T1 - An approach to a process model of laser beam melt ablation using methods of linear and non-linear data analysis N2 - As a non-contact process laser beam melt ablation offers several advantages compared to conventional processing mechanisms. During ablation the surface of the workpiece is molten by the energy of a CO2-laser beam, this melt is then driven out by the impulse of an additional process gas. Although the idea behind laser beam melt ablation is rather simple, the process itself has a major limitation in practical applications: with increasing ablation rate surface quality of the workpiece processed declines rapidly. With different ablation rates different surface structures can be distinguished, which can be characterised by suitable surface parameters. The corresponding regimes of pattern formation are found in linear and non-linear statistical properties of the recorded process emissions as well. While the ablation rate can be represented in terms of the line-energy, this parameter does not provide sufficient information about the full behaviour of the system. The dynamics of the system is dominated by oscillations due to the laser cycle but includes some periodically driven non-linear processes as well. Upon the basis of the measured time series, a corresponding model is developed. The deeper understanding of the process can be used to develop strategies for a process control. Y1 - 2003 SN - 3-928921-88-6 ER - TY - JOUR A1 - Cser, Adrienn A1 - Donner, Reik Volker A1 - Schwarz, Udo A1 - Otto, Andreas H. A1 - Geiger, M. A1 - Feudel, Ulrike T1 - Towards a better understanding of laser beam melt ablation using methods of statistical analysis N2 - Laser beam melt ablation, as a contact free machining process, offers several advantages compared to conventional processing mechanisms. Although the idea behind it is rather simple, the process has a major limitation: with increasing ablation rate surface quality of the workpiece processed declines rapidly. The structures observed show a clear dependence of the line energy. In dependence of this parameter several regimes of the process have been separated. These are clearly distinguishable as well in the surfaces obtained as in the signals gained by the measurement of the process emissions which is the observed quantity chosen. Y1 - 2002 SN - 88-87030-44-8 ER - TY - BOOK A1 - Karg, Detlef A1 - Schopper, Franz A1 - Paschke, Ralph A1 - Meyer, Michael A1 - Ackermann, Irmgard A1 - Baxmann, Matthias A1 - Buchinger, Marie-Luise A1 - Cante, Marcus A1 - Dreger, Hans-Joachim A1 - Gramlich, Sybille A1 - Schwarz, Ulrike A1 - Hübener, Dieter A1 - Metzler, Matthias A1 - Niemann, Alexander A1 - Rohowski, Ilona A1 - Senst, Ingetraud A1 - Groß, Wera ED - Brandenburgisches Landesamt für Denkmalpflege und Archäologisches Landesmuseum, T1 - Denkmalentdeckungen BT - Bilder aus dem Land Brandenburg N2 - »Wenn du reisen willst, mußt du die Geschichte dieses Landes kennen und lieben. Das ist ganz unerläßlich. [...] Wag’ es getrost und du wirst es nicht bereuen. Eigentümliche Freuden und Genüsse werden dich begleiten. Du wirst Entdeckungen machen, denn überall wohin du kommst, wirst du, vom Touristenstandpunkt aus, eintreten wie in ›jungfräuliches Land‹. Du wirst Klosterruinen begegnen, von deren Existenz höchstens die nächste Stadt eine leise Kenntnis hatte; du wirst inmitten alter Dorfkirchen, deren zerbröckelter Schindelturm nur auf Elend deutete, große Wandbilder oder in den treppenlosen Grüften reiche Kupfersärge mit Kruzifix und vergoldeten Wappenschildern finden; du wirst Schlachtfelder überschreiten, Wendenkirchhöfe, Heidengräber, von denen die Menschen nichts mehr wissen.« Die in diesem Bildband gesammelten »Denkmalentdeckungen« verstehen sich als Einladung zu einer Reise durch das Land Brandenburg. Theodor Fontane hatte für ein solches Unternehmen genau den richtigen Blick, als er in seinen »Wanderungen durch die Mark Brandenburg« 1864 diese Sätze schrieb. Auch heute noch sollten wir seiner Anregung zu Begegnungen mit der Geschichte und der Kunstgeschichte des Landes folgen, die uns im Dialog der Kulturen und der Zeiten eine Standortbestimmung in der Gegenwart und eine Orientierung für die Zukunft zugleich bietet. KW - Brandenburg KW - Denkmal KW - Denkmalpflege KW - Bildband KW - Tourismus Y1 - 2007 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-72290 SN - 978-3-88462-244-5 PB - Wernersche Verlagsgesellschaft CY - Worms ET - 1200 ER - TY - JOUR A1 - Feudel, Ulrike A1 - Jansen, Wolfgang A1 - Kurths, Jürgen A1 - Schwarz, Udo A1 - Voss, Henning U. T1 - Solar variability : simple models and proxy data Y1 - 1997 SN - 4-274-90187-4 ER - TY - JOUR A1 - Bube, Kevin A1 - Neto, Camilo Rodrigues A1 - Donner, Reik Volker A1 - Schwarz, Udo A1 - Feudel, Ulrike T1 - Linear and nonlinear characterization of surfaces from a laser beam melt ablation process N2 - We apply linear and nonlinear methods to study the properties of surfaces generated by a laser beam melt ablation process. As a result we present a characterization and ordering of the surfaces depending on the adjusted process parameters. Our findings give some insight into the performance of two widely applied multifractal analysis methods-the detrended fluctuation analysis and the wavelet transform modulus maxima method-on short real world data Y1 - 2006 UR - http://iopscience.iop.org/0022-3727/ U6 - https://doi.org/10.1088/0022-3727/39/7/011 SN - 0022-3727 ER - TY - JOUR A1 - Cser, Adrienn A1 - Donner, Reik Volker A1 - Schwarz, Udo A1 - Feudel, Ulrike A1 - Otto, Andreas H. T1 - Statistical parameters of a control strategy of laser beam melt ablation N2 - Laser beam melt ablation - a contact-free machining process - offers several advantages compared to conventional processing mechanisms: there exists no tool wear and even extremely hard or brittle materials can be processed. During ablation the workpiece is molten by a CO2-laser beam, this melt is then driven out by the impulse of a process gas. The idea behind laser ablation is rather simple, but it has a major limitation in practical applications: with increasing ablation rates surface quality of the workpiece processed declines rapidly. At high ablation rates, depending on the process parameters different periodic-like structures can be observed on the ablated surface. These structures show a dependence on the line energy, which has been identified as a fundamental control parameter. In dependence on this parameter several regimes with different behaviours of the process have been separated. These regimes are distinguishable as well in the surfaces obtained as in the signals gained by the measurement of the process emissions. Further aim is to identify the different modes of the system and reach a deeper understanding of the dynamics of the molten material in order to understand the formation of these surface structures. With this it should be possible to influence the system in the direction of avoiding structure formation even at high ablation rates. Relying on the results on-line monitoring and control of the process should be studied. Y1 - 2001 UR - http://www.agnld.uni-potsdam.de/~shw/Paper/2001-EIS.ps ER - TY - JOUR A1 - Jobst, Anne A1 - Knobloch, Eberhard A1 - Leitner, Ulrike A1 - Mikosch, Regina A1 - Pieper, Herbert A1 - Schwarz, Ingo A1 - Werner, Petra A1 - Werther, Romy T1 - Margot Faak zum 80. Geburtstag KW - BBAW KW - Margot Faak Y1 - 2006 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-35594 SN - 1617-5239 SN - 2568-3543 VL - VII IS - 13 SP - 8 EP - 9 PB - Universitätsverlag Potsdam CY - Potsdam ER - TY - JOUR A1 - Jobst, Anne A1 - Knobloch, Eberhard A1 - Leitner, Ulrike A1 - Mikosch, Regina A1 - Pieper, Herbert A1 - Schwarz, Ingo A1 - Bourguet, Marie-Noëlle A1 - Ette, Ottmar A1 - Suckow, Christian A1 - Thiemer-Sachse, Ursula A1 - Faak, Margot ED - Ette, Ottmar ED - Knobloch, Eberhard T1 - HiN : Alexander von Humboldt im Netz = Festschrift für Margot Faak zu Ehren ihres 80. Geburtstages N2 - Inhalt: - Die Mitarbeiter der Avh-Forschungsstelle: Margot Faak zum 80. Geburtstag - Marie-Noëlle Bourguet: La fabrique du savoir. Essai sur les carnets de voyage d'Alexander von Humboldt - Ottmar Ette: Unterwegs zu einer Weltwissenschaft? Alexander von Humboldts Weltbegriffe und die transarealen Studien - Eberhard Knobloch: Erkundung und Erforschung - Alexander von Humboldts Amerikareise - Herbert Pieper: Die Geognosie der Vulkane - Christian Suckow: Prinz Humboldt - Ursula Thiemer-Sachse: ¡Qué arte es comprender el arte ...! La visión del arte indígena de América por Alejandro de Humboldt - Margot Faak: G. W. Leibniz im Urteil Alexander von Humboldts - Regina Mikosch, Ingo Schwarz: Bibliographie zu Margot Faak T3 - HiN : Alexander von Humboldt im Netz ; International Review for Humboldtian Studies - VII.2006, 13 KW - Autograph KW - Emil Naumann KW - Lion Feuchtwanger KW - 1799-1804 KW - Relation historique KW - Netzwerke des Wissens KW - TransArea Studies KW - Weltbegriff KW - Weltbewusstsein KW - Humboldts Leibnizbild KW - G. W. Leibniz KW - Bibliographie KW - Margot Faak KW - Reisetagebuch KW - indianische Kunst KW - 1829 KW - I. A. Schmakow KW - Vulkan KW - Geognosie KW - Abraham Gottlob Werner KW - Lateinamerika Y1 - 2006 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-35709 SN - 1617-5239 SN - 2568-3543 VL - VII IS - 13 PB - Universitätsverlag Potsdam CY - Potsdam ER - TY - JOUR A1 - Knobloch, Eberhard A1 - Kölbel, Bernd A1 - Sauerwein, Martin A1 - Sauerwein, Katrin A1 - Kölbel, Steffen A1 - Buckow, Cathleen A1 - Leitner, Ulrike A1 - Schwarz, Ingo A1 - Suckow, Christian A1 - Werner, Petra A1 - Pieper, Herbert ED - Ette, Ottmar ED - Knobloch, Eberhard T1 - HiN : Alexander von Humboldt im Netz = Herbert Pieper zum 65. Geburtstag N2 - Herbert Pieper zum 65. Geburtstag Inhalt: - Eberhard Knobloch: Herbert Pieper zum 65. Geburtstag. Ein Rückblick - Bernd Kölbel, Martin Sauerwein, Katrin Sauerwein, Steffen Kölbel, Cathleen Buckow: Das Fragment des englischen Tagebuches von Alexander von Humboldt - Ulrike Leitner: Humboldt, Cotta, Ritter. Eine Miszelle über die Arbeit an einer Edition - Ingo Schwarz: "da ich mich lebhaft für sein Schiksal im Neuen Continent interessire". A. v. Humboldt als Förderer Oscar M. Liebers - Christian Suckow: Humboldts spanische Option 1830. Eine Nachlese - Petra Werner: Bemerkungen zu Alexander von Humboldts Russland-Tagebuch - Herbert Pieper Alexander von Humboldts Wahl in die Akademie der Wissenschaften zu Berlin - Publikationen von Herbert Pieper [Bibliographie] T3 - HiN : Alexander von Humboldt im Netz ; International Review for Humboldtian Studies - IX.2008, 16 KW - Archimedes KW - BBAW KW - Mathematik KW - Zahlentheorie KW - 1769-1799 KW - England KW - Georg Foster KW - Reisetagebuch KW - Carl Ritter KW - Edition KW - Neudatierung KW - Francis Lieber KW - Geologie KW - Oscar M. Lieber KW - 1830 KW - Graf Ferdinand von Galen KW - Politik KW - Spanien KW - 1829 KW - Geographie KW - Meteorologie KW - Petra Werner KW - Russland KW - Russland-Tagebuch KW - Sibirien KW - Akademie der Wissenschaften Y1 - 2008 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-42246 SN - 1617-5239 SN - 2568-3543 VL - IX IS - 16 PB - Universitätsverlag Potsdam CY - Potsdam ER -