@inproceedings{8478, author = {{Arifulina, Svetlana }}, booktitle = {{Proceedings of the Doctoral Symposium of the 5th International Conference on Software Language Engineering 2012, Dresden, Germany (SLE (Doctoral Symposium))}}, pages = {{23--26}}, publisher = {{CEUR-WS.org}}, title = {{{Towards a Framework for the Integration of Modeling Languages}}}, volume = {{935}}, year = {{2012}}, } @inproceedings{8479, author = {{Güldali , Baris and Sauer, Stefan and Löhr, Perdita }}, booktitle = {{Proceedings of the Workshop Modellbasierte und Modellgetriebene Softwaremodernisierung (MMSM 2012)}}, number = {{2}}, pages = {{5--6}}, publisher = {{Softwaretechnik-Trends}}, title = {{{Entwicklung eines Softwarewerkzeugs für die modellgetriebene Migration betrieblicher Informationssysteme}}}, volume = {{32}}, year = {{2012}}, } @inproceedings{8480, author = {{Mussbacher , Gunter and Alam , Omar and Alhaj , Mohammed and Ali , Shaukat and Amálio , Nuno and Barn , Balbir and Bræk , Rolv and Clark , Tony and Combemale , Benoit and Cysneiros , Luiz Marcio and Fatima , Urooj and France , Robert and Georg , Geri and Horkoff , Jennifer and Kienzle , Jörg and Leite , Julio Cesar and Lethbridge , Timothy C. and Luckey , Markus and Moreira , Ana and Mutz , Felix and A. Oliveira, A. Padua and C. Petriu , Dorina and Schöttle, Matthias and Troup, Lucy and Werneck, Vera M. B. }}, booktitle = {{Proceedings of the Workshop about Comparing Modeling Approaches 2012 (@MODELS 2012)}}, publisher = {{ACM}}, title = {{{Assessing composition in modeling approaches}}}, doi = {{https://dl.acm.org/citation.cfm?id=2459032}}, year = {{2012}}, } @inproceedings{8483, author = {{Luckey , Markus and Thanos , Christian and Gerth, Christian and Engels, Gregor}}, booktitle = {{Proceedings of 1st International Workshop on EVALUATION for SELF-ADAPTIVE and SELF-ORGANIZING SYSTEMS at SASO'12}}, title = {{{Multi-Staged Quality Assurance for Self-Adaptive Systems}}}, year = {{2012}}, } @inproceedings{8484, author = {{Geisen, Silke }}, booktitle = {{Proceedings of Software Engineering 2012 (SE 2012) - Doktorandensymposium}}, pages = {{7--12}}, publisher = {{Petra Hofstedt, Claus Lewerentz (BTU Cottbus)}}, title = {{{Ein Ansatz zur Anpassung von Software Engineering Methoden im laufenden Projekt}}}, volume = {{Report 01/12}}, year = {{2012}}, } @inproceedings{8548, author = {{Liebendörfer, Michael and Hochmuth, Reinhard}}, booktitle = {{Beiträge zum Mathematikunterricht 2012 : Vorträge auf der 46. Tagung für Didaktik der Mathematik}}, pages = {{545--548}}, publisher = {{WTM-Verlag}}, title = {{{Mathematikinteresse im 1. Studiensemester}}}, volume = {{1}}, year = {{2012}}, } @inproceedings{8552, author = {{Biehler, Rolf and Hoppenbrock, Axel and Klemm, Juliane and Liebendörfer, Michael and Wassong, Thomas}}, booktitle = {{CETL-MSOR Conference 2011}}, title = {{{Training of student teaching assistants and e-learning via math-bridge – Two projects at the German Centre for Higher Mathematics Education}}}, year = {{2012}}, } @inbook{9587, author = {{Beutner, Marc and Kremer, H.-Hugo and Zoyke, A}}, booktitle = {{Individuelle Förderung und berufliche Orientierung im berufsschulischen Übergangssystem. Ergebnisse aus dem Forschungs- und Entwicklungsprojekt InLab}}, editor = {{Kremer, H.-H and Beutner, M and Zoyke, A}}, pages = {{7 -- 20}}, title = {{{Vorstellung des Modellprojekts InLab}}}, year = {{2012}}, } @inbook{9588, author = {{Beutner, Marc and Frehe, Petra and Gebbe, M and Gockel, C and Kremer, H.-Hugo and Zoyke, A}}, booktitle = {{Individuelle Förderung und berufliche Orientierung im berufsschulischen Übergangssystem. Ergebnisse aus dem Forschungs- und Entwicklungsprojekt InLab}}, editor = {{Kremer, H.-H and Beutner, M and Zoyke, A}}, pages = {{109 -- 149}}, title = {{{Vorstellung von vier Instrumenten zur Individuellen Förderung}}}, year = {{2012}}, } @inbook{9670, author = {{Strauß, Sara}}, booktitle = {{anglistik & englischunterricht}}, title = {{{Victorian Values in Nineteenth- and Twenty-First-Century Advertising and Consumer Practices}}}, year = {{2012}}, } @inbook{9699, author = {{Strauß, Sara}}, booktitle = {{Who’s afraid of...? Facets of Fear in Anglophone Literature and Film}}, editor = {{Gymnich, Marion}}, pages = {{141--156}}, publisher = {{V&R Unipress Bonn}}, title = {{{Facets of Children’s Fears in Twentieth- and Twenty-First-Century Stream-of-Consciousness Fiction}}}, year = {{2012}}, } @inbook{9700, author = {{Strauß, Sara}}, booktitle = {{A Hundred Years of The Secret Garden – Frances Hodgson Burnett’s Children’s Classic Revisited}}, editor = {{Gymnich, Marion and Lichterfeld, Imke}}, pages = {{77--89}}, publisher = {{V&R Unipress Bonn}}, title = {{{Constructions of ‘Otherness’ in Frances Hodgson Burnett’s The Secret Garden}}}, year = {{2012}}, } @misc{9701, booktitle = {{Critical Engagements: A Journal of Criticism and Theory: Special Section: Eva Figes}}, editor = {{Strauß, Sara}}, number = {{2}}, pages = {{95--108}}, title = {{{The Persistence of Modernism in Light}}}, volume = {{5}}, year = {{2012}}, } @misc{9733, abstract = {{Interview 11 Oct. 2012}}, author = {{Flotmann, Christina}}, publisher = {{Deutschlandfunk}}, title = {{{Der Zauber Magischer Welten}}}, year = {{2012}}, } @article{9781, abstract = {{A piezoelectric energy harvester is an electromechanical device that converts ambient mechanical vibration into electric power. Most existing vibration energy harvesting devices operate effectively at a single frequency only, dictated by the design of the device. This frequency must match the frequency of the host structure vibration. However, real world structural vibrations rarely have a specific constant frequency. Therefore, piezoelectric harvesters that generate usable power across a range of exciting frequencies are required to make this technology commercially viable. Currently known harvester tuning techniques have many limitations, in particular they miss the ability to work during harvester operation and most often cannot perform a precise tuning. This paper describes the design and testing of a vibration energy harvester with tunable resonance frequency, wherein the tuning is accomplished by changing the attraction force between two permanent magnets by adjusting the distance between the magnets. This tuning technique allows the natural frequency to be manipulated before and during operation of the harvester. Furthermore the paper presents a physical description of the frequency tuning effect. The experimental results achieved with a piezoelectric bimorph fit the calculated results very well. The calculation and experimental results show that using this tuning technique the natural frequency of the harvester can be varied efficiently within a wide range: in the test setup, the natural frequency of the piezoelectric bimorph could be increased by more than 70\%.}}, author = {{Al-Ashtari, Waleed and Hunstig, Matthias and Hemsel, Tobias and Sextro, Walter}}, journal = {{Smart Materials and Structures}}, number = {{3}}, pages = {{035019}}, title = {{{Frequency tuning of piezoelectric energy harvesters by magnetic force}}}, volume = {{21}}, year = {{2012}}, } @article{9782, abstract = {{Piezoelectric structures are nowadays used in many different applications. A better understanding of the influence of material properties and geometrical design on the performance of these structures helps to develop piezoelectric structures specifically designed for their application. Different equivalent circuits have been introduced in the literature to investigate the behaviour of piezoelectric transducers. The model parameters are usually determined from measurements covering the characteristic frequencies of the piezoelectric transducer. This article introduces an analytical technique for calculating the mechanical and electrical equivalent system parameters and characteristic frequencies based on material properties and geometry for a cantilever bimorph structure. The model is validated by measurements using a cantilever bimorph and fits the experimental results better than previous models. The model gives a full set of piezoelectric transducer parameters and is therefore well suited for further theoretical investigations of piezoelectric transducers for different applications. The results also show that even small manufacturing tolerances have a considerable effect on the system parameters and characteristic frequencies. This might lead to intolerable deviations, especially in dynamic applications and should be avoided by careful design and production.}}, author = {{Al-Ashtari, Waleed and Hunstig, Matthias and Hemsel, Tobias and Sextro, Walter}}, journal = {{Journal of Intelligent Material Systems and Structures}}, number = {{1}}, pages = {{15--23}}, title = {{{Analytical determination of characteristic frequencies and equivalent circuit parameters of a piezoelectric bimorph}}}, doi = {{10.1177/1045389X11430742}}, volume = {{23}}, year = {{2012}}, } @inproceedings{9783, abstract = {{To optimize the ultrasound irradiation for cavitation based ultrasound applications like sonochemistry or ultrasound cleaning, the correlation between cavitation intensity and the resulting effect on the process is of interest. Furthermore, changing conditions like temperature and pressure result in varying acoustic properties of the liquid. That might necessitate an adaption of the ultrasound irradiation. To detect such changes during operation, process monitoring is desired. Labor intensive processes, that might be carried out for several hours, also require process monitoring to increase their reliability by detection of changes or malfunctions during operation. In some applications cavitation detection and monitoring can be achieved by the application of sensors in the sound field. Though the application of sensors is possible, this necessitates modifications on the system and the sensor might disturb the sound field. In other applications harsh, process conditions prohibit the application of sensors in the sound field. Therefore alternative techniques for cavitation detection and monitoring are desired. The applicability of an external microphone and a self-sensing ultrasound transducer for cavitation detection were experimentally investigated. Both methods were found to be suitable and easily applicable.}}, author = {{Bornmann, Peter and Hemsel, Tobias and Sextro, Walter and Maeda, Takafumi and Morita, Takeshi}}, booktitle = {{Ultrasonics Symposium (IUS), 2012 IEEE International}}, issn = {{1948-5719}}, keywords = {{cavitation, chemical reactors, microphones, process monitoring, reliability, ultrasonic applications, ultrasonic waves, acoustic properties, cavitation based ultrasound applications, cavitation intensity, change detection reliability, external microphone, malfunction detection reliability, nonperturbing cavitation detection, nonperturbing cavitation monitoring, process monitoring, self-sensing ultrasound transducer, sonochemical reactors, sonochemistry, ultrasound cleaning, ultrasound irradiation, Acoustics, Liquids, Monitoring, Sensors, Sonar equipment, Transducers, Ultrasonic imaging}}, pages = {{1141--1144}}, title = {{{Non-perturbing cavitation detection / monitoring in sonochemical reactors}}}, doi = {{10.1109/ULTSYM.2012.0284}}, year = {{2012}}, } @inproceedings{9784, abstract = {{Piezoelectric inertia motors use the inertia of a body to drive it by means of a friction contact in a series of small steps. These motors can operate in ``stick-slip'' or ``slip-slip'' mode, with the fundamental frequency of the driving signal ranging from several Hertz to more than 100 kHz. To predict the motor characteristics, a Coulomb friction model is sufficient in many cases, but numerical simulation requires microscopic time steps. This contribution proposes a much faster simulation technique using one evaluation per period of the excitation signal. The proposed technique produces results very close to those of timestep simulation for ultrasonics inertia motors and allows direct determination of the steady-state velocity of an inertia motor from the motion profile of the driving part. Thus it is a useful simulation technique which can be applied in both analysis and design of inertia motors, especially for parameter studies and optimisation.}}, author = {{Hunstig, Matthias and Hemsel, Tobias and Sextro, Walter}}, booktitle = {{Ultrasonics Symposium (IUS), 2012 IEEE International}}, issn = {{1948-5719}}, keywords = {{friction, ultrasonic motors, Coulomb friction model, efficient simulation technique, friction contact, high-frequency piezoelectric inertia motor, motor characteristics prediction, numerical simulation, slip-slip mode, stick-slip mode, time-step simulation, ultrasonic inertia motor, Acceleration, Acoustics, Actuators, Computational modeling, Friction, Numerical models, Steady-state}}, pages = {{277--280}}, title = {{{An efficient simulation technique for high-frequency piezoelectric inertia motors}}}, doi = {{10.1109/ULTSYM.2012.0068}}, year = {{2012}}, } @inproceedings{9785, abstract = {{Hydrothermal method enables to synthesize high quality piezoelectric materials. To shorten the reaction time and to get higher quality materials, we propose an ultrasonic irradiation to the solution during the hydrothermal method. We named it ultrasonic assisted hydrothermal method (UAHTM). We have synthesized lead-free piezoelectric material and PZT thin film and the effect of UAHTM have been confirmed. In this study, we tried to improve UAHTM. First, to generate powerful and stable ultrasonic irradiation at high temperature on UAHTM, we developed a new transducer using LiNbO3 single crystal. Second, to prevent contamination to the materials, A Teflon cover on the tip of transducer was attached.}}, author = {{Isobe, Gaku and Ageba, Ryo and Maeda, Takafumi and Bornmann, Peter and Hemsel, Tobias and Morita, Takeshi}}, booktitle = {{AIP Conference Proceedings}}, editor = {{B. J. Linde, Bogumil and Paczkowski, Jacek and Ponikwicki, Nikodem}}, keywords = {{contamination, lead compounds, piezoelectric materials, piezoelectric thin films, piezoelectric transducers, ultrasonic effects}}, number = {{1}}, pages = {{569--572}}, publisher = {{AIP}}, title = {{{Synthesis of piezoelectric materials by ultrasonic assisted hydrothermal method}}}, doi = {{10.1063/1.3703251}}, volume = {{1433}}, year = {{2012}}, } @article{9786, abstract = {{Self-optimizing mechatronic systems are a new class of technical systems. On the one hand, new challenges regarding dependability arise from their additional complexity and adaptivity. On the other hand, their abilities enable new concepts and methods to improve the dependability of mechatronic systems. This paper introduces a multi-level dependability concept for selfoptimizing mechatronic systems and shows how probabilistic planning can be used to improve the availability and reliability of systems in the operating phase. The general idea to improve the availability of autonomous systems by applying probabilistic planning methods to avoid energy shortages is exemplified on the example of an innovative railway vehicle.}}, author = {{Klöpper, Benjamin and Sondermann-Wölke, Christoph and Romaus, Christoph}}, journal = {{Journal of Robotics and Mechatronics}}, keywords = {{self-optimizing systems, dependability, probabilistic planning, energy management}}, number = {{1}}, pages = {{5--15}}, title = {{{Probabilistic Planning for Predictive Condition Monitoring and Adaptation Within the Self-Optimizing Energy Management of an Autonomous Railway Vehicle}}}, volume = {{24}}, year = {{2012}}, }