TY - CHAP A1 - Wimmer, Georg A1 - Steinmetz, T. A1 - Gödel, N. A1 - Clemens, M. A1 - Kurz, S. A1 - Bebendorf, M. A1 - Rjasanow, S. ED - Ciupricina, G. ED - Ioan, D. T1 - Symmetric Coupling of Finite-Element and Boundary-Element Methods for Electro-Quasistatic Field Simulations BT - Selected papers from SCEE 2006, Sinaia, Romania, 17.-22.09.2006 T2 - Scientific Computing in Electrical Engineering (SCEE 2006), Series Mathematics in Industry 11 Y1 - 2007 SN - 978-3-540-71979-3 SP - 309 EP - 316 PB - Springer CY - Berlin, Heidelberg, New York ER - TY - JOUR A1 - Bittner, Boris A1 - Zellner, J. A1 - Wabra, N. A1 - von Hodenberg, M. A1 - Schneider, S. A1 - Schneider, R. A1 - Schob, A. A1 - Rudolph, G. A1 - Gratzke, A. A1 - Moffat, A. T1 - Projection objective of a mcrolithographic projection exposure apparatus Y1 - 2013 ER - TY - JOUR A1 - Höfflin, Dennis A1 - Sauer, Christian A1 - Schiffler, Andreas A1 - Hartmann, Jürgen T1 - Process Monitoring Using Synchronized Path Infrared Thermography in PBF-LB/M JF - Sensors N2 - Additive manufacturing processes, particularly Laser-Based Powder Bed Fusion of Metals (PBF-LB/M), enable the development of new application possibilities due to their manufacturing-specific freedom of design. These new fields of application require a high degree of component quality, especially in safety-relevant areas. This is currently ensured primarily via a considerable amount of downstream quality control. Suitable process monitoring systems promise to reduce this effort drastically. This paper introduces a novel monitoring method in order to gain process-specific thermal information during the manufacturing process. The Synchronized Path Infrared Thermography (SPIT) method is based on two synchronized galvanometer scanners allowing high-speed and high-resolution observations of the melt pool in the SWIR range. One scanner is used to steer the laser over the building platform, while the second scanner guides the field of view of an IR camera. With this setup, the melting process is observed at different laser powers, scan speeds and at different locations with respect to the laser position, in order to demonstrate the positioning accuracy of the system and to initially gain thermal process data of the melt pool and the heat-affected zone. Therefore, the SPIT system shows a speed independent overall accuracy of ±2 Pixel within the evaluated range. The system further allows detailed thermal observation of the melt pool and the surrounding heat-affected zone. KW - SPIT KW - PBF-LB/M KW - additive manufacturing KW - process monitoring KW - SWIR KW - melt pool KW - galvanometer scanner Y1 - 2022 U6 - https://doi.org/10.3390/s22165943 VL - 22 IS - 16 PB - MDPI ER - TY - JOUR A1 - Ochs, Dennis A1 - Wehnert, Kira-Kristin A1 - Hartmann, Jürgen A1 - Schiffler, Andreas A1 - Schmitt, Jan T1 - Sustainable Aspects of a Metal Printing Process Chain with Laser Powder Bed Fusion (LPBF) JF - Procedia CIRP N2 - Production companies are getting more and more aware of the relevancy of energy costs and the environmental impact of their manufactured products. Hence, the knowledge about the energy intensity of new process technologies as metal printing becomes increasingly crucial. Therefore, data about the energy intensity of entire process chains allow a detailed assessment of the life cycle costs and environmental impact of metal printed parts. As metal printing with Laser Powder Bed Fusion (LPBF) is applied from rapid prototyping to serial manufacturing processes more and more, sustainability data are useful to support a valid scale-up scenario and energetic improvements of the 3D-printing machinery as well as peripheral aggregates used in the process chain. The contribution aims to increase the transparency of the LPBF process chain in terms of its energy consumption. Therefore a generalized model to assess sustainability aspects of metal printed parts is derived. For this purpose, the LPBF process chain with the essential pre-, main- and post-processes is evaluated regarding its energy intensity. Here, the sub-processes, for example wet and dry cleaning of the printer, sieving of the metal powder or sand-blasting of the part are analyzed as well as the main printing process. Based on the derived experimental data from an installed, industry-like process chain, a model is created, which tends to generalize the experimental findings to evaluate other metal printed parts and process chain variants in terms of their energy intensity. Y1 - 2021 UR - 10.1016/j.procir.2021.01.163 VL - 98 SP - 613 EP - 618 PB - Elsevir ER - TY - JOUR A1 - Baureis, Peter A1 - Popken, G. A1 - Hartmann, M. A1 - Milosiu, H. A1 - Neubauer, H. A1 - Oehler, F. A1 - Peter, M. T1 - A2.4-GHz ISM- Transmitter IC with Novel Quadrature Clock Generation Technique for a Localization Application JF - 2005 IEEE MTT-S Digest Y1 - 2005 ER - TY - BOOK A1 - Frühbrodt, Lutz T1 - Die Liberalisierung der Telekommunikationsdienste BT - Vom nationalen Monopol zum globalen Wettbewerb Y1 - 2002 CY - Wiesbaden ER - TY - CHAP A1 - Claudia, Wunderlich ED - Ministerium für auswärtige Angelegenheiten der Ukraine, Diplomatische Akademie der Ukraine T1 - Teaching Intercultural Skills through a Global Business Simulation N2 - This paper reports on how intercultural skills can be taught in English for Specific Purposes courses (ESP) in addition to reading, writing, listening, and speaking skills in a global business simulation KW - English for Specific Purposes KW - Intercultural communication KW - Global Business Simulation Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:863-opus-43432 PB - Diplomatische Akademie der Ukraine CY - Kiev ER - TY - CHAP A1 - Jüngst, Heike Elisabeth ED - Josting, Petra ED - Schmideler, Sebastian T1 - Insekten im Kindersachbuch - Objekt und Subjekt T2 - Bonsels' Tierleben: Insekten und Kriechtiere in Kinder- und Jugendmedien ; [Sammelband zur Tagung "Bonsels' Tierleben", die vom 29. bis 31. Oktober 2014 an der Universität Bielefeld stattfand] Y1 - 2015 SN - 978-3-8340-1518-1 SP - 345 EP - 358 PB - Schneider Verlag Hohengehren CY - Baltmannsweiler ER - TY - CHAP A1 - Jüngst, Heike Elisabeth ED - Mälzer, Nathalie T1 - Sachcomicübersetzung und Laierübersetzung T2 - Comics - Übersetzungen und Adaptionen Y1 - 2015 UR - https://permalink.bibkatalog.de/wue/BV042714969 UR - https://permalink.bibkatalog.de/wue/BV042483537 SN - 9783732998340 SN - 9783732901319 SP - 301 EP - 319 PB - Frank & Timme CY - Berlin ER - TY - JOUR A1 - Diethelm, Kai A1 - Kitzing, Konrad A1 - Picard, Rainer A1 - Siegmund, Stefan A1 - Trostorff, Sascha A1 - Waurick, Marcus T1 - A Hilbert Space Approach to Fractional Differential Equations JF - Journal of Dynamics and Differential Equations N2 - We study fractional differential equations of Riemann–Liouville and Caputo type in Hilbert spaces. Using exponentially weighted spaces of functions defined on R, we define fractional operators by means of a functional calculus using the Fourier transform. Main tools are extrapolation- and interpolation spaces. Main results are the existence and uniqueness of solutions and the causality of solution operators for non-linear fractional differential equations. Y1 - 2022 U6 - https://doi.org/10.1007/s10884-020-09932-6 VL - 34 SP - 481 EP - 504 ER - TY - JOUR A1 - Diethelm, Kai A1 - Kiryakova, Virginia A1 - Luchko, Yuri A1 - Tenreiro Machado, José A. A1 - Tarasov, Vasily E. T1 - Trends, directions for further research, and some open problems of fractional calculus JF - Nonlinear Dynamics N2 - The area of fractional calculus (FC) has been fast developing and is presently being applied in all scientific fields. Therefore, it is of key relevance to assess the present state of development and to foresee, if possible, the future evolution, or, at least, the challenges identified in the scope of advanced research works. This paper gives a vision about the directions for further research as well as some open problems of FC. A number of topics in mathematics, numerical algorithms and physics are analyzed, giving a systematic perspective for future research. KW - fractional calculus Y1 - 2022 U6 - https://doi.org/https://doi.org/10.1007/s11071-021-07158-9 SN - 1573-269X VL - 107 SP - 3245 EP - 3270 ER - TY - JOUR A1 - Diethelm, Kai A1 - Uhlig, Frank T1 - A New Approach to Shooting Methods for Terminal Value Problems of Fractional Differential Equations JF - Journal of Scientific Computing N2 - For terminal value problems of fractional differential equations of order α∈(0,1) that use Caputo derivatives, shooting methods are a well developed and investigated approach. Based on recently established analytic properties of such problems, we develop a new technique to select the required initial values that solves such shooting problems quickly and accurately. Numerical experiments indicate that this new proportional secting technique converges very quickly and accurately to the solution. Run time measurements indicate a speedup factor of between 4 and 10 when compared to the standard bisection method. KW - Fractional differential equation KW - Caputo derivative KW - Terminal condition KW - Terminal value problem KW - Shooting method KW - Proportional secting KW - Secant method Y1 - 2023 UR - doi.org/10.1007/s10915-023-02361-9 SN - 0885-7474 VL - 97 IS - 2 ER - TY - JOUR A1 - Diethelm, Kai A1 - Tuan, Hoang The T1 - Upper and lower estimates for the separation of solutions to fractional differential equations JF - Fractional Calculus and Applied Analysis N2 - Given a fractional differential equation of order α∈(0,1] with Caputo derivatives, we investigate in a quantitative sense how the associated solutions depend on their respective initial conditions. Specifically, we look at two solutions x1 and x2, say, of the same differential equation, both of which are assumed to be defined on a common interval [0, T], and provide upper and lower bounds for the difference x1(t)−x2(t) for all t∈[0,T] that are stronger than the bounds previously described in the literature. Y1 - 2022 U6 - https://doi.org/10.1007/s13540-021-00007-x SN - 1314-2224 VL - 25 SP - 166 EP - 180 ER - TY - CHAP A1 - Jüngst, Heike T1 - „Humor für Ingenieure 1: Uli Steins nutzlose Erfindungen.“ „Humor für Ingenieure 2: Überraschungseier.“ BT - DAAD-interne Broschüre T2 - Beiträge für den Reader der DAAD-Lektoren-AG „Humor“ Y1 - 2001 SP - 131 EP - 136 ER - TY - CHAP A1 - Jüngst, Heike ED - Johannes Gutenberg-Universität Mainz, Zentralstelle für universitäre Fort- und Weiterbildung T1 - Individueller Wortschatz BT - Eine Teilstrecke auf dem Weg zum selbstbestimmten Lernen T2 - Sprachandragogik Jahrbuch 1996. Schriften zur wissenschaftlichen Weiterbildung Y1 - 1998 SP - 91 EP - 100 CY - Mainz ER - TY - CHAP A1 - Jüngst, Heike ED - von Bardeleben, Renate T1 - Das Frauenbild in Posy Simmonds’ Cartoons BT - Tradition und Ironie T2 - Frauen in Kultur und Gesellschaft Y1 - 2000 SP - 349 EP - 361 PB - Stauffenburg CY - Tübingen ER - TY - CHAP A1 - Jüngst, Heike T1 - Der Duke of Edinburgh’s Award als landeskundliches Thema im Fremdsprachenunterricht T2 - Neusprachliche Mitteilungen Y1 - 2001 VL - 54 IS - 3 SP - 156 EP - 162 ER - TY - CHAP A1 - Jüngst, Heike ED - Hagemann, Susanne T1 - Scotland in Picture Books for Children T2 - Terranglian Territories Y1 - 2000 SP - 641 EP - 648 PB - Peter Lang CY - Frankfurt/Main ER - TY - CHAP A1 - Jüngst, Heike ED - Baetens, Jan T1 - Carol Lay's Joyride BT - How to Become Yourself By Being Someone Else T2 - The Graphic Novel Y1 - 2001 SP - 131 EP - 138 PB - Leuven University Press CY - Löwen ER - TY - CHAP A1 - Jüngst, Heike T1 - Landeskunde mit Cartoons T2 - Zielsprache Englisch Y1 - 2000 VL - 30 IS - 1-2 SP - 19 EP - 23 ER - TY - JOUR A1 - Jüngst, Heike T1 - Potential of Integrating Dubbing Activities in the Translation Classroom JF - Trans-Revista de traductología Y1 - 2013 IS - 17 SP - 103 EP - 114 ER - TY - CHAP A1 - Jüngst, Heike T1 - Moderne Großstadtsagen im Fremdsprachenunterricht für Erwachsene T2 - Neusprachliche Mitteilungen Y1 - 1998 VL - 51 IS - 2 SP - 95 EP - 99 ER - TY - CHAP A1 - Jüngst, Heike T1 - ‘And now a word from our sponsor …’ BT - Werbefilme in den Unterricht einbauen T2 - Zielsprache Englisch Y1 - 1998 VL - 28 IS - 4 SP - 34 EP - 39 ER - TY - JOUR A1 - Jüngst, Heike T1 - Selbermachen! Selbermachen? JF - 1001 Buch Y1 - 2014 IS - 1 SP - 31 EP - 32 ER - TY - JOUR A1 - Jüngst, Heike T1 - „Was ist was?“ BT - neues Spiel, neues Glück? JF - 1001 Buch Y1 - 2014 VL - 73 IS - 2 ER -