TY - CONF AU - Hanke, Sören AU - Wallscheid, Oliver AU - Böcker, Joachim ID - 29637 T2 - 2019 IEEE International Electric Machines & Drives Conference (IEMDC) TI - Continuous-control-set model predictive control with integrated modulator in permanent magnet synchronous motor applications ER - TY - JOUR AU - Gaona, Daniel Efren Erazo AU - Wallscheid, Oliver AU - Böcker, Joachim ID - 29629 JF - IEEE Transactions on Industrial Electronics TI - Improved Fusion of Permanent Magnet Temperature Estimation Techniques for Synchronous Motors Using a Kalman Filter ER - TY - JOUR AU - Bünnings, Christian AU - Schmitz, Hendrik AU - Tauchmann, Harald AU - Ziebarth, Nicolas R. ID - 15075 IS - 2 JF - Journal of Risk and Insurance SN - 0022-4367 TI - The Role of Prices Relative to Supplemental Benefits and Service Quality in Health Plan Choice VL - 86 ER - TY - CONF AB - This paper explores Finnish, German and Swedish older adults’ perceptions of a future welfare service with increased use of welfare technologies, specifically care robots. The issues are the rapid digitalization and development of health and welfare technology, which presently is mainly technology driven (not need or user driven), and the demographic challenge. The aim of the study was to explore older adults’ perception of the future use of welfare technology or care robots. A qualitative approach with focus group discussions was employed, followed by thematic analysis. The results are presented in four overall themes: the impact on daily life for older adults and professional caregivers, codes of practice and terms of use, dissemination of information and knowledge, and conditions for successful implementation. There were significant differences in the informants’ attitudes toward and knowledge about care robots. However, the informants’ attitudes appeared to change during the focus groups and in general, became more positive. Authentic needs, which care robots could support, refer to independence, safety and security, and the ability to manage or ease daily life or working life. The results suggest that older adults, after receiving relevant information, were open to the idea of being supported by care robots in their daily lives. AU - Johansson-Pajala, Rose-Marie AU - Thommes, Kirsten AU - Hoppe, Julia Amelie AU - Tuisku, Outi AU - Hennala, Lea AU - Pekkarinen, Satu AU - Melkas, Helinä AU - Gustafsson, Christine ED - Zhou, Jia ED - Salvendy, Gavriel ID - 8538 KW - Care robots KW - Older adults KW - Implementation KW - Information KW - Perceptions KW - Welfare technology SN - 978-3-030-22011-2 T2 - HCII 2019 TI - Improved Knowledge Changes the Mindset: Older Adults’ Perceptions of Care Robots VL - 11592 ER - TY - CONF AU - Keuck, Lukas AU - Schafmeister, Frank AU - Böcker, Joachim ID - 30334 T2 - Proc. 34th IEEE Applied Power Electronics Conference (APEC) TI - Computer-Aided Design and Optimization of an Integrated Transformer with Distributed Air Gap and Leakage Path for an LLC Resonant Converter ER - TY - CONF AU - Keuck, Lukas AU - Schafmeister, Frank AU - Böcker, Joachim AU - Jungwirth, Herbert AU - Schmidhuber, Michael ID - 30335 T2 - Proc. IEEE International Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management (PCIM) TI - Computer-Aided Design and Optimization of an Integrated Transformer with Distributed Air Gap and Leakage Path for LLC Resonant Converter ER - TY - CONF AU - Ahmad, Mohsin Ejaz AU - Schafmeister, Frank AU - Böcker, Joachim ID - 30337 T2 - Proc. IEEE International Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management (PCIM) TI - Novel Current Measurement Concept for Half Bridge Topologies based on simple-to-implement Digital Current Observer ER - TY - CONF AU - Bolte, Sven AU - Schafmeister, Frank AU - Böcker, Joachim ID - 30336 T2 - Proc. IEEE International Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management (PCIM) TI - LCC Resonant Converter for Piezoelectric Transducers with Phase Shift Control ER - TY - CONF AU - Bolte, Sven AU - Schafmeister, Frank AU - Böcker, Joachim ID - 30338 T2 - Proc. IEEE International Symposium on Industrial Electronics (ISIE) TI - Bidirectional Resonant Converter with Integrated Magnetics for On-Board Chargers ER - TY - CONF AU - Rehlaender, Philipp AU - Grote, Tobias AU - Schafmeister, Frank AU - Böcker, Joachim ID - 30344 T2 - Proc. IEEE International Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management (PCIM) TI - Interleaved Active Clamp Forward Converters as Single Stage On-Board DC-DC Converters for EVs – an Accurate Model and Design Considerations ER - TY - CONF AU - Rehlaender, Philipp AU - Grote, Tobias AU - Tikhonov, Sergey AU - Njiende, Hugues AU - Schafmeister, Frank AU - Böcker, Joachim AU - Thiemann, Peter ID - 30346 T2 - Proc. 21st European Conference on Power Electronics and Applications (EPE-ECCE Europe) TI - A PCB-Integrated Winding Using a Litz Structure for a Wireless Charging Coil ER - TY - CONF AU - Rehlaender, Philipp AU - Grote, Tobias AU - Schafmeister, Frank AU - Böcker, Joachim ID - 30345 T2 - Proc. IEEE International Symposium on Industrial Electronics (ISIE) TI - Analytical Topology Comparison for a Single-Stage On-Board EV-Battery Converter ER - TY - GEN AU - Pohlmann, Robert AU - Schafmeister, Frank ID - 30361 TI - Current measurement circuit for TCM-PFC ER - TY - GEN AU - Tischendorf, Ricardo AU - Bieber, M. AU - Kneer, R. AU - Schmid, Hans-Joachim ID - 24515 KW - FSP KW - nanoparticle synthesis KW - in situ measurements TI - Representative Sample Extraction from Spray Flames for SMPS and HR-TEM Measurements ER - TY - GEN AU - Tischendorf, Ricardo AU - Schmid, Hans-Joachim ID - 25059 TI - Experimentelle Charakterisierung von Eisenoxid-Nanopartikeln aus Sprayflammen mit koaxialer Zweistoffzerstäubung ER - TY - CONF AU - Schubert, Philipp AU - Hermann, Ben AU - Bodden, Eric ID - 7626 T2 - Proceedings of the 25th International Conference on Tools and Algorithms for the Construction and Analysis of Systems (TACAS 2019), Held as Part of the European Joint Conferences on Theory and Practice of Software (ETAPS 2019) TI - PhASAR: An Inter-Procedural Static Analysis Framework for C/C++ VL - II ER - TY - GEN AU - Bothe, Mike AU - Fedorov, Alexander AU - Frei, Herrmann AU - Lutters, Nicole AU - Kenig, Eugeny ID - 22457 TI - Dynamische Simulation reaktiver Absorptionsprozesse zur Entwicklung modellbasierter Werkzeuge zur Vermeidung von Vor- und Notfallsituationen in der Industrie ER - TY - CHAP AU - Peckhaus, Volker ED - Arnswald, Ulrich ED - Stadler, Friedrich ED - Weibel, Peter ID - 17637 T2 - Der Wiener Kreis – Aktualität in Wissenschaft, Literatur, Architektur und Kunst TI - Logik im Logischen Empirismus VL - 17 ER - TY - THES AU - Ott, M. ID - 30670 TI - Identifikation und Kompensation produktionsbedingter Abweichungen im elektrischen Antrieb von Elektro- und Hybridfahrzeugen ER - TY - CONF AU - Stallmeister, Tim AU - Chalicheemalapalli Jayasankar, Deviprasad AU - Wang, Z. AU - Tröster, Thomas ID - 16032 SN - 9781925627220 TI - Self-sealing tool concept for RTM-processes ER - TY - CONF AU - Stallmeister, Tim AU - Chalicheemalapalli Jayasankar, Deviprasad AU - Wang, Z. AU - Tröster, Thomas ID - 16033 TI - Selbstabdichtendes Werkzeugkonzept für RTM-Prozesse ER - TY - JOUR AU - Herberg, Artjom AU - Yu, Xiaoqian AU - Kuckling, Dirk ID - 30932 IS - 4 JF - Polymers KW - controlled radical polymerization KW - atom transfer radical polymerization KW - end group determination KW - N-isopropylacrylamide KW - block copolymerization KW - smart polymers KW - temperature sensitive polymers KW - lower critical solution temperature KW - ESI-TOF mass spectrometry KW - ion mobility separation KW - size exclusion chromatography TI - End Group Stability of Atom Transfer Radical Polymerization (ATRP)-Synthesized Poly(N-isopropylacrylamide): Perspectives for Diblock Copolymer Synthesis VL - 11 ER - TY - JOUR AU - Li, Jie AU - Ji, Chendong AU - Yu, Xiaoqian AU - Yin, Meizhen AU - Kuckling, Dirk ID - 30929 IS - 14 JF - Macromolecular Rapid Communications KW - Materials Chemistry KW - Polymers and Plastics KW - Organic Chemistry SN - 1022-1336 TI - Dually Cross‐Linked Supramolecular Hydrogel as Surface Plasmon Resonance Sensor for Small Molecule Detection VL - 40 ER - TY - JOUR AU - Reis, Berthold AU - Vehlow, David AU - Rust, Tarik AU - Kuckling, Dirk AU - Müller, Martin ID - 30927 IS - 23 JF - International Journal of Molecular Science KW - catechol chemistry KW - poly(caffeic acid) KW - polyelectrolyte complex coatings KW - thermoresponsive coatings KW - controlled release KW - bortezomib KW - multiple myeloma TI - Thermoresponsive Catechol Based-Polyelectrolyte Complex Coatings for Controlled Release of Bortezomib VL - 20 ER - TY - JOUR AU - Yu, Xiaoqian AU - Herberg, Artjom AU - Kuckling, Dirk ID - 30928 JF - European Polymer Journal KW - Organic Chemistry KW - Polymers and Plastics KW - General Physics and Astronomy KW - Materials Chemistry SN - 0014-3057 TI - Azlactone-functionalized smart block copolymers for organocatalyst immobilization VL - 120 ER - TY - JOUR AU - Mahlert, Laura AU - Anderski, Juliane AU - Schoppa, Timo AU - Mulac, Dennis AU - Sun, Jingjiang AU - Kuckling, Dirk AU - Langer, Klaus ID - 30934 JF - International Journal of Pharmaceutics KW - Light-responsive polymersPhotodynamic therapyControlled drug deliveryHT-29-MTX cellsIntestinal cancer SN - 0378-5173 TI - In vitro evaluation of innovative light-responsive nanoparticles for controlled drug release in intestinal PDT VL - 565 ER - TY - JOUR AU - Sun, Jingjiang AU - Jung, Dimitri AU - Schoppa, Timo AU - Anderski, Juliane AU - Picker, Marie-Theres AU - Ren, Yi AU - Mulac, Dennis AU - Stein, Nora AU - Langer, Klaus AU - Kuckling, Dirk ID - 30936 IS - 7 JF - ACS Applied Bio Materials KW - light-responsive polymers KW - biodegradable polymers KW - polycondensation SN - 2576-6422 TI - Light-Responsive Serinol-Based Polycarbonate and Polyester as Degradable Scaffolds VL - 2 ER - TY - JOUR AU - Sun, Jingjiang AU - Anderski, Juliane AU - Picker, Marie-Theres AU - Langer, Klaus AU - Kuckling, Dirk ID - 30933 IS - 5 JF - Macromolecular Chemistry and Physics KW - Materials Chemistry KW - Organic Chemistry KW - Polymers and Plastics KW - Physical and Theoretical Chemistry KW - Condensed Matter Physics SN - 1022-1352 TI - Preparation of Light-Responsive Aliphatic Polycarbonate via Versatile Polycondensation for Controlled Degradation VL - 220 ER - TY - JOUR AB - This article offers new insight into students’ responses to Womens’ and Gender Studies (WGS) classes by overcoming the self-selection bias hitherto inherent in the field. Exploring the experiences of 1406 students (770 women, 636 men) of a university with a WGS requirement across all study programmes, we examine the prevailing discourses on WGS, participants’ (dis)agreement as well as personal and professional benefits gained through WGS. Additionally, we evaluate the perceived value of WGS for themselves, in society, and of WGS opportunities in higher education. Findings reveal a gender bias regarding discourses, experience, benefit, and value, with 70.1% women and 32.4% men supporting the idea of WGS as a mandatory subject. Women’s support indicates a need for tools to negotiate gender issues, while men’s resistance serves to defend male privileges. We conclude that a requirement of WGS classes amplifies the potential for both – resistance and change. AU - Horwath, Ilona AU - Diabl, Christian ID - 24462 JF - Gender and Education KW - Education policy KW - equality KW - higher education KW - critical pedagogies KW - gender mainstreaming KW - curriculum SN - 0954-0253 TI - Liberating or indoctrinating? Surveying students’ perceptions of a Womens’ and Gender Studies requirement ER - TY - CONF AU - Terhechte, Johannes AU - Berscheid, Anna Lena AU - Horwath, Ilona ID - 24464 TI - DEVELOPMENT OF A CYBER-PHYSICAL SIMULATION ASSISTANCE SYSTEM FOR PARTIALLY AUTOMATED OPTIMIZATION OF THE EXTRUSION PROCESS ER - TY - JOUR AU - Berscheid, Anna Lena AU - Horwath, Ilona AU - Riegraf, Birgitt ID - 24460 JF - Feministische Studien SN - 2365-9920 TI - Einleitung: Cyborgs revisited: Zur Verbindung von Geschlecht, Technologien und Maschinen ER - TY - CONF AU - Vorderbrüggen, Julian AU - Gröger, Benjamin AU - Kupfer, Robert AU - Hoog, Arne AU - Gude, Maik AU - Meschut, Gerson ID - 19893 T2 - PROCEEDINGS OF THE 22ND INTERNATIONAL ESAFORM CONFERENCE ON MATERIAL FORMING: ESAFORM 2019 TI - Phenomena of forming and failure in joining hybrid structures – Experimental and numerical studies of clinching thermoplastic composites and metal ER - TY - JOUR AU - Vorderbrüggen, Julian AU - Meschut, Gerson ID - 19894 JF - Composite Structures SN - 0263-8223 TI - Investigations on a material-specific joining technology for CFRP hybrid joints along the automotive process chain ER - TY - JOUR AB - Plastic freeforming (PF) is an additive-manufacturing process for producing three-dimensional plastic parts based on 3D CAD data by applying plastic droplets in layers. This process is used to produce customer-specific and complex geometries (prototypes and small series) on organic sheets. A comparable serial process is the injection of a second component onto organic sheets by injection molding. A sufficient bond between the PF structure and the organic sheets is of particular importance for each application. If this is not guaranteed, the composite system cannot withstand the mechanical load and fails. The force exerted on the system can no longer be transmitted between the PF structure and the organic sheet. The organic sheet is made of glass fiber-reinforced polypropylene (PP). The connection between the organic sheet and the PF structure is achieved by welding the molten polymer droplets and the surface of the organic sheet. The PF structures are made of PP to ensure sufficient compatibility with regard to the weldability of the components. The processing of PP in the PF process is a challenge because PP is a semicrystalline material. The shrinkage of semi-crystalline materials is significantly higher compared to amorphous materials. Due to the layered structure of the components, the shrinkage of the individual layers results in undesired warpage. The adhesive strength between the organic sheet and the PF structure is investigated by determining the bending strength in the 3-point bending test. The investigations include an optimization of the process parameters to maximize the adhesive strength. The experimental investigations show that an increase of the nozzle and build chamber temperature leads to a higher adhesive strength. In further investigations, the temperature of the nozzle shows no significant influence on the surface temperature despite the expected heat radiation. The surface temperature is almost only dependent on the temperature of the build chamber. AU - Moritzer, Elmar AU - Hirsch, André AU - Heim, H.P. AU - Cherif, C. AU - Truemper, W. ID - 22047 JF - Welding in the World TI - Plastic droplet welding: bond strength between plastic freeforming structures and continuous fiber-reinforced thermoplastic composites VL - 63 ER - TY - CONF AB - The mechanical properties of thin-walled plastic components are limited. One approach to improve the strength or stiffness of these components is to reinforce the thin-walled areas with an individually adapted Fused Deposition Modeling structure. Fused Deposition Modeling (FDM) is one of the most commonly used additive manufacturing processes. This process is characterized by the deposition of a fused, thermoplastic filament. Depending on the form of the reinforcement structure, the resulting hybrid structure should show higher strength or stiffness. The objective of the project is to determine constructive design and process guidelines for FDM structures. The FDM structure is to be used as a partial reinforcement for lightweight components and be adapted to the respective load conditions. Because of the lightweight application, the FDM structure should also have the lowest possible weight. The optimization of the FDM parts for different load cases is realized by adapting the design parameters. These parameters influence the layer generation and therefore also the inner structure of the FDM parts. In preliminary studies, the manufacturing restrictions of the FDM process are defined. The specimens are manufactured based on the Design of Experiments. To determine the static strength properties, different tests (tensile, compression, flexural, torsion and impact) are carried out. The investigations show that the filling strategy affects the mechanical properties. As a result of the investigations, design and process guidelines for the FDM structures are established according to the load conditions. AU - Moritzer, Elmar AU - Hirsch, André AU - Bürenhaus, Franziska Isabelle ID - 22028 IS - 1 T2 - AIP Conference Proceedings TI - Development and Modeling of Design and Process Guidelines for FDM Structures for the Partial Reinforcement of Hybrid Structures VL - 2065 ER - TY - CONF AB - Additive manufacturing processes, like the Fused Deposition Modeling (FDM) process, do not need product-specific tools and create parts directly from the CAD data. In the FDM process, the semi-finished product, a wire of a thermoplastic polymer, is melted and forced through a nozzle. The continuous positioning of this nozzle allows the polymer to weld together strand by strand and layer by layer to produce a component. Because no mold is used in the FDM process, no holding pressure can be generated as in injection molding processes, in which the holding pressure is used to minimize the shrinkage and warpage of the part. In the FDM process, the part is generated in an ambient pressure environment. Each strand cools down and shrinks separately. This causes residual stresses in the part that can lead to major warpage and a complete stoppage of the process. This is the main reason why the material selection in the FDM process is restricted in comparison to conventional polymer processing technologies. In this paper, the warpage of different polymers is quantified as a criterion for evaluating the processability of polymers in the FDM process. Due to the process principle, the part properties in the FDM process are mainly influenced by the machine quality and the data processing, so that it is difficult to test a material for FDM independently of the machine and the data processing. Considering these influences, a custom-built specimen is created to test and quantify the warpage of different types of blended and reinforced polyamide 6. Considering the experimentally investigated warpage, the materials can be evaluated and the warpage can be related to the shrinkage investigated in pvT measurements. This procedure allows the machine- and process-independent rating of the processability in terms of warpage for different materials. Alongside other criteria, this is a necessary step to develop new materials with good processability in the FDM process. AU - Schöppner, Volker AU - Schumacher, C. AU - Fels, C. ID - 22027 T2 - AIP Conference Proceedings TI - A Method to Evaluate the Process-Specific Warpage for Different Polymers in the FDM Process ER - TY - BOOK AB - Das Fused Deposition Modeling (FDM) ist ein etabliertes additives Fertigungsverfahren zur Her-stellung von thermoplastischen Kunststoffbauteilen. In dem vorliegenden Beitrag sind FDM-Verstärkungsstrukturen aus dem Material Ultem 9085 dynamischen Langzeituntersuchungen un-terzogen worden. Dabei wurde die innere Struktur der Probekörper über eine Parametervariation verändert, sodass anschließend die signifikanten Einflussfaktoren auf die Langzeitfestigkeit un-ter dynamischer Belastung identifiziert und analysiert werden konnten. Mit dieser Vorgehens-weise sollte gleichzeitig eine Optimierung der FDM-Verstärkungsstrukturen hinsichtlich der dy-namischen Langzeiteigenschaften bei Biege- und Druckbelastungen vorgenommen werden. Des Weiteren sind anhand der Probekörper die auftretenden Bruch- und Rissausbreitungsmechanis-men analysiert worden. Anhand der ermittelten Wöhlerkurven kann die Lebensdauer unter dy-namischer Belastung abgeschätzt werden. Außerdem zeigen die Untersuchungen, dass Fehlstel-len durch eine hohe Strangbreite und Überfüllungen im Bauteil für Schwachstellen in den FDM-Verstärkungsstrukturen sorgen, an denen Risse bei Druckbelastung entstanden sind und sich dadurch schneller ausbreiten konnten. AU - Moritzer, Elmar AU - Hirsch, André AU - Paulus, S. ID - 22026 SN - 978-3-658-27411-5 TI - Rissausbreitungsmechanismen in FDM-Verstärkungsstrukturen unter dynamischer Beanspruchung ER - TY - THES AU - Bolte, Sven ID - 30854 TI - Modellierung und Optimierung leistungselektronischer Konverter mit Halbleitern großer Bandlücke unter Verwendung kalorimetrischer Messverfahren ER - TY - THES AB - Hochgeschwindigkeitsantriebe kommen unter anderem in Vakuumpumpen, Turboradialverdichtern und Zentrifugen zum Einsatz und zeichnen sich typischerweise durch einen Betrieb mit konstanter Drehzahl über längere Zeiträume aus. Das in dieser Arbeit betrachtete Antriebssystem setzt sich aus einer permanentmagneterregten Synchronmaschine mit magnetgelagertem Rotor, einem LC-Filter, einem Wechselrichter in 2- oder 3-Stufen-Topologie, diverser Sensorik sowie einem Antriebsregler zusammen. In der vorliegenden Arbeit wurden Pulsmusterformen auf viertel- und halbschwingungssymmetrischer Basis ausgewählt und nach relevanten Kriterien wie die Eliminierung niederfrequenter Harmonischer oder die Minimierung des Oberschwingungsgehalts offline-optimiert. Hierzu wurde eine modifizierte Variante der Partikel-Schwarm-Optimierung verwendet. Ziel war die Substitution der trägerbasierten Dreiecksmodulation durch eine geeignete Modulatorstruktur zur Generierung und Ausgabe offline-optimierter Pulsmuster an den Wechselrichter. Im Verlauf der Arbeit wurde zudem herausgestellt, dass die herkömmliche feldorientierte Reglerstruktur nicht mit den optimierten Pulsmustern kombiniert werden kann, was auf die fehlende Pulssymmetrie und die abweichenden Kurzzeitmittelwerte der Schaltsignale von der Stellspannung im aktuellen Reglertakt zurückzuführen ist. Daher wurde eine modellbasierte Reglerstruktur, die zum Teil steuernden Charakter aufweist, entworfen und implementiert. Durchgeführte Messungen an einem Laststand mit einer Bemessungsleistung von 150 kW ergaben im maximal zulässigen Arbeitspunkt gegenüber der dreiecksmodulierten Pulsweitenmodulation eine Steigerung des Gesamtwirkungsgrads von bis zu 0,6% bei Verwendung eines 2-Punkt-Wechselrichters mit ausgangsseitigem LC-Filter. AU - Peter, Klaus ID - 29903 SN - 978-3-8440-7097-2 TI - Untersuchung des Verlustverhaltens eines geregelten und mit optimierten Pulsmustern gespeisten Hochgeschwindigkeits-Antriebssystems VL - 9 ER - TY - THES AU - Pape, Thorsten ID - 30855 SN - 978-3-8440-6952-5 TI - Ein Beitrag zur Regelung von Permanentmagnet-Synchronmotoren in Statorflusskoordinaten ohne Rotorlagesensor ER - TY - GEN AB - Die Erfindung betrifft einen optischen Übergang zwischen zwei optischen Schichtwellenleitern. Dazu ist eine Anordnung vorgesehen aus einem ersten optischen Schichtwellenleiter (2) und einem zweiten optischen Schichtwellenleiter (3), wobei der erste optische Schichtwellenleiter (2) und der zweite optische Schichtwellenleiter (3) voneinander verschiedene über ihre jeweilige Länge konstante Dicken (d, r) aufweisen, der erste optische Schichtwellenleiter (2) mit dem zweiten optischen Schichtwellenleiter (3) mittels einer optischen Schichtwellenleiterstruktur (4) verbunden ist, die über ihre gesamte Länge (w) eine Dicke (h) aufweist, die zwischen der Dicke (d) des ersten optischen Schichtwellenleiters (2) und der Dicke (r) des zweiten optischen Schichtwellenleiters (3) liegt. Erfindungsgemäß ist die Dicke (h) der optischen Schichtwellenleiterstruktur (4) über die gesamte Länge (w) der optischen Schichtwellenleiterstruktur (4) konstant. Damit wird eine Möglichkeit für einen effizienten und mit geringen Verlusten behafteten Übergang zwischen zwei optischen Schichtwellenleitern mit unterschiedlicher Dicke bereitgestellt. AU - Hammer, Manfred AU - Förstner, Jens AU - Ebers, Lena ID - 7720 KW - tet_topic_waveguides TI - Optical transition between two optical waveguides layer and method for transmitting light ER - TY - JOUR AB - Employing main and sector-specific investment-grade CDS indices from the North American and European CDS market and performing mean-variance out-of-sample analyses for conservative and aggressive investors over the period from 2006 to 2014, this paper analyzes portfolio benefits of adding corporate CDS indices to a traditional financial portfolio consisting of stock and sovereign bond indices. As a baseline result, we initially find an increase in portfolio (downside) risk-diversification when adding CDS indices, which is observed irrespective of both CDS markets, investor-types and different sub-periods, including the global financial crisis and European sovereign debt crisis. In addition, the analysis reveals higher portfolio excess returns and performance in CDS index portfolios, however, these effects clearly differ between markets, investor-types and sub-periods. Overall, portfolio benefits of adding CDS indices mainly result from the fact that institutional investors replace sovereign bond indices rather than stock indices by CDS indices due to better risk-return characteristics. Our baseline findings remain robust under a variety of robustness checks. Results from sensitivity analyses provide further important implications for institutional investors with a strategic focus on a long-term conservative portfolio management. AU - Hippert, Benjamin AU - Uhde, André AU - Wengerek, Sascha Tobias ID - 4562 IS - 2 JF - Review of Derivatives Research KW - Corporate credit default swap indices KW - Mean-variance asset allocation KW - Out-of-sample portfolio optimization KW - Portfolio risk-diversification KW - Portfolio performance evaluation TI - Portfolio Benefits of Adding Corporate Credit Default Swap Indices: Evidence from North America and Europe VL - 22 ER - TY - CHAP AU - Lammer, Christina ED - van der Meer, Anne-Fleur ED - Schrover, Wouter ED - Moser, Nelleke ID - 30955 T2 - Naar het onbekende: Perspectieven op literatuur, cultuur en kennis TI - 'De triomf van de mens’ – kennis in 'Geschiedenis van een berg' ER - TY - CONF AU - Guettatfi, Zakarya AU - Platzner, Marco AU - Kermia, Omar AU - Khouas, Abdelhakim ID - 31067 T2 - 2019 IEEE International Parallel and Distributed Processing Symposium Workshops (IPDPSW) TI - An Approach for Mapping Periodic Real-Time Tasks to Reconfigurable Hardware ER - TY - CHAP AU - Willeke, Stephanie ED - Brokoff , Jürgen ED - Walter-Jochum, Robert ID - 31752 T2 - Hass/Literatur. Literatur- und kulturwissenschaftliche Beiträge zu einer Theorie- und Diskursgeschichte TI - Konstruktionen des Terrors. Zur Hassrede in den Romanen Jenseits von Deutschland von George Tenner und Das dunkle Schiff von Sherko Fatah ER - TY - CHAP AU - Willeke, Stephanie ED - Willeke, Stephanie ED - Eke, Norbert Otto ID - 31746 T2 - Zwischen den Sprachen – Mit der Sprache? Deutschsprachige Literatur in Palästina und Israel TI - „So kommt doch alles noch zum Happy End.“ Sammy Gronemanns zionistische Komödie Der Prozess um des Esels Schatten ER - TY - CHAP AU - Willeke, Stephanie ED - Neuhaus , Stefan ED - Nover, Immanuel ID - 31756 T2 - Das Politische in der Literatur der Gegenwart TI - Der eingehegte Terrorist? Dorothea Dieckmanns Guantánamo ER - TY - CHAP AU - Ballweg, Sandra ED - Ballweg, Sandra ED - Kühn, Bärbel ID - 31809 T2 - Portfolioarbeit im Kontext von Sprachenunterricht. Neue internationale Entwicklungen TI - Portfolioarbeit als Professionalisierungsgelegenheit ER - TY - CHAP AU - Ballweg, Sandra AU - Riemer, Claudia ID - 32003 T2 - Dhoch3-Studienmodule Deutsch als Fremdsprache TI - Das Verhältnis zwischen Fremdsprachenerwerbsforschung und Fremdsprachenunterricht - Einführung in das Themenfeld ER - TY - CHAP AU - Ballweg, Sandra AU - Introna, Silvia AU - Riemer, Claudia ID - 32011 T2 - Dhoch3-Studienmodule Deutsch als Fremdsprache TI - Theorien und Hypothesen für den L2-Erwerb - Einführung in das Themenfeld ER - TY - GEN AB - Embedding techniques allow the approximations of finite dimensional attractors and manifolds of infinite dimensional dynamical systems via subdivision and continuation methods. These approximations give a topological one-to-one image of the original set. In order to additionally reveal their geometry we use diffusion mapst o find intrinsic coordinates. We illustrate our results on the unstable manifold of the one-dimensional Kuramoto--Sivashinsky equation, as well as for the attractor of the Mackey-Glass delay differential equation. AU - Gerlach, Raphael AU - Koltai, Péter AU - Dellnitz, Michael ID - 16711 T2 - arXiv:1902.08824 TI - Revealing the intrinsic geometry of finite dimensional invariant sets of infinite dimensional dynamical systems ER - TY - CONF AU - Häsel-Weide, Uta AU - Nührenbörger, M. ED - Rezat, Sebastian ED - Fan, L. ED - Hattermann, M. ED - Schumacher, J. ED - Wuschke, H. ID - 32089 T2 - Proceedings of the Third International Conference on Mathematics Textbook Research an Development TI - Materials für inclusive mathematics education - Design principles an practices. ER - TY - JOUR AU - Breucker, T. AU - Freesemann, O. AU - Häsel-Weide, Uta AU - Opitz, E. M. AU - Nührenbörger, M. AU - Wittich, C. ID - 32090 IS - 70 JF - Zeitschrift für Heilpädagogik TI - Fördern im inklusiven Mathematikunterricht im Spannungsfeld zwischen gemeinsamen Lernsituationen und gezielter Förderung. ER - TY - GEN AU - Häsel-Weide, Uta AU - Nührenbörger, M. AU - Reinold, M. ID - 32091 SN - 978-3122009946 TI - Das Zahlenbuch 4. Förderheft ER - TY - GEN AU - Häsel-Weide, Uta AU - Nührenbörger, M. AU - Reinold, M. ID - 31954 SN - 978-3-12-200998-4 TI - Das Zahlenbuch. Förderkommentar Lernen zum 4. Schuljahr ER - TY - GEN AU - Peckhaus, Volker ID - 18734 T2 - Zentralblatt für Mathematik und ihre Grenzgebiete TI - Wille, Matthias, "Gottlob Frege. Begriffsschrift, eine der arithmetischen nachgebildete Formelsprache des reinen Denkens", Springer Spektrum: Berlin 2018 (Klassische Texte der Wissenschaft) ER - TY - GEN AU - Peckhaus, Volker ID - 18736 T2 - Zentralblatt für Mathematik und ihre Grenzgebiete TI - Honerkamp, Josef, "Denken in Strukturen und seine Geschichte. Von der Kraft des mathematischen Beweises", Springer: Berlin 2018 ER - TY - CHAP AU - Ptashnyk, Stefaniya ED - Bülow, Lars ED - Fischer, Ann Kathrin ED - Herbert, Kristina ID - 32202 T2 - Dimensionen des sprachlichen Raums: Variation - Mehrsprachigkeit - Konzeptualisie-rung (Schriften zur deutschen Sprache in Österreich) TI - Borrowing, Code-Switching and Fused Lects: Language Contact and Multilingual Prac-tices from a Socio-Historical Perspective VL - 45 ER - TY - CHAP AU - Ptashnyk, Stefaniya ED - Tancer, Josef ID - 32253 T2 - Mediale Selbstreferenzen TI - Mediale (Selbst-)Referenzen in der galizischen Presse des 19. Jahrhunderts: „Gazeta Lwowska“ und „Lemberger Zeitung“ im Vergleich ER - TY - GEN AU - Ptashnyk, Stefaniya AU - Falkson, Katharina AU - Lemberg, Ingrid ID - 32257 T2 - HSozKult (online unter https://www.hsozkult.de/conferencereport/id/tagungsberichte-8281) TI - „Stadtrechte und Stadtrechtsreformationen“. Tagung an der Heidelberger Akademie der Wissenschaften vom 03.04.2019 – 05.04.2019. Tagungsbericht ER - TY - GEN AU - Peckhaus, Volker ID - 18987 T2 - Mathematical Reviews TI - Jesseph, Douglas M., “Hobbes and the Syllogism”, in: Marco Sgarbi/Matteo Cosci (Hgg.), The Aftermath of Syllogism, Blumsbury Academic: London 2018 (Bloomsbury Studies in the Aristotelian Tradition), 67–81 ER - TY - GEN AU - Peckhaus, Volker ID - 18988 T2 - Mathematical Reviews TI - Tieszen, Richard, “Husserl and Gödel”, in: Stefania Centrone (Hg.), Essays on Husserl’s Logic and Philosophy of Mathematics, Springer: Dordrecht 2017 (Synthese Library; 384), 431–459 ER - TY - GEN AU - Peckhaus, Volker ID - 18993 T2 - Mathematical Reviews TI - Vanzo, Alberto, “Kant’s False Subtlety of the Four Syllogistic Figures”, in: Marco Sgarbi/Matteo Cosci (Hgg.), The Aftermath of Syllogism, Blumsbury Academic: London 2018 (Bloomsbury Studies in the Aristotelian Tradition), 157–190 ER - TY - CHAP AU - Häsel-Weide, Uta ED - Baumert, B. ED - Willen, M. ID - 32092 SN - 978-3781523234 T2 - Zwischen Persönlichkeitsbildung und Leistungsentwicklung. Fachspezifische Zugänge zu inklusivem Unterricht TI - Lernumgebungen für den inklusiven Mathematikunterricht zwischen reichhaltiger Offenheit und fokussierter Förderung ER - TY - CHAP AU - Ptashnyk, Stefaniya ED - Denkler, Markus ED - Elspaß, Stephan ED - Hüpper, Dagmar ED - Topalović, Elvira ID - 32259 T2 - Journal of Historical Sociolinguistics, 2/2019 (online) TI - Book Review: Deutsch im 17. Jahrhundert: Studien zu Sprachkontakt, Sprachvariation und Sprachwandel. Gedenkschrift für Jürgen Macha. (Sprache - Literatur und Studien zur Linguistik/Germanistik, Band 46) ER - TY - GEN AU - Kilic, Mehmet ID - 8955 TI - Vertrauensbildung und Reputationssysteme auf digitalen B2B-Märkten - Ein klassifizierender Überblick ER - TY - GEN AU - Yilmaz, Melih ID - 9773 TI - Gib anderen dein Zuhause - Eine deskriptive Analyse der Ausbuchungsrate von Inseraten auf Airbnb ER - TY - GEN AU - Rodehutskors, Luca Maurizio ID - 8800 TI - Conception of a digital Sales Bonus System based on Blockchain Technology ER - TY - GEN AU - Dirksen, Daniel ID - 9515 TI - Entwicklung eines Frameworks für Geschäftsmodelle im On-The-Fly Computing ER - TY - GEN AU - Lo Tauro, Santo Stefan ID - 13804 TI - Worüber sprechen Ihre Kunden? Anwendung und Evaluation von Text Mining auf Online-Kundenbewertungen am Beispiel von Google Maps Reviews ER - TY - GEN AU - Post, Hannes ID - 14541 TI - Haben B2B-Kunden auch Gefühle? Eine semantische Analyse von Online-Kundenbewertungen auf digitalen B2B-Märkten ER - TY - GEN AU - Henke, Lena ID - 13747 TI - Kreativität in der Wirtschaftsinformatik: Ein systematischer Literaturüberblick von Experiment-Designs ER - TY - GEN AU - Recker, Davide Pietro ID - 13746 TI - Kreativitäts-Experimente in der Wirtschaftsinformatik - Ein systematischer Literaturüberblick ER - TY - GEN AU - Meier zu Wickern, Joelle ID - 13446 TI - The Digital CV - Ein Literaturüberblick über Onlien-Bewertungen in Online Labor Markets ER - TY - GEN AU - Petrovic, Bogoljub ID - 13575 TI - Eine deskriptive Analyse der Verteilung von Online-Bewertungen auf digitalen B2B-Märkten ER - TY - GEN AU - Schulte, Tristan Aaron ID - 13572 TI - Eine semantische Analyse von Online-Bewertungen auf digitalen B2B-Märkten ER - TY - GEN AU - Golis, Miriam ID - 9675 TI - Entwicklung eines Rahmenwerks zur Evaluation von Geschäftsmodellen zur Entscheidungsunterstützung für Kooperationen mit Startups am Beispiel der Schüco International KG ER - TY - GEN AU - Brockmeier, Felix Karl ID - 10289 TI - Feasibility study on the use of Hypermedia/HATEOAS using an example of a RESTful API from the financial services environment based on OpenAPI/Swagger ER - TY - GEN AU - Schiller, Leo ID - 13450 TI - Mechanismen zur Aggregation der Meinungen einer Crowd - Ein klassifizierender Literaturüberblick ER - TY - GEN AU - Selig, Maximilian Julius ID - 6627 TI - The effects of driver variables on online review metrics: A meta-analysis ER - TY - GEN AU - Althaus, Maike ID - 12079 TI - Share at all Costs? Ein Literaturüberblick zur Privacy Risk Calculus Theory ER - TY - GEN AU - Rohde, Lukas ID - 10203 TI - Sozioökonomische Implikationen des Sharing Economy Trends ER - TY - GEN AU - Bentfeld, Bastian ID - 15026 TI - Reputation in der Sharing Economy - Eine ökonometrische Analyse des Zusammenhangs zwischen Online-Bewertungen und Nachfrage am Beispiel von Airbnb ER - TY - GEN AU - Agethen, Christopher Heinrich ID - 10038 TI - Stoppt das Sharing? Ökonometrische Untersuchungen zur gesetzlichen Einschränkung von Airbnb ER - TY - GEN AU - Wegener, Moritz ID - 11959 TI - It's a match! - Entwicklung eines Ansatzes zur Identifikation von Cross-Listings auf Airbnb und TripAdvisor ER - TY - GEN AU - Gerzen, Gabriele ID - 13449 TI - Do Online Ratings Matter in the Sharing Economy? Analyzing the Impact of Online Ratings on Demand on Airbnb ER - TY - GEN AU - Resch, Tim ID - 14987 TI - Möglichkeiten und Grenzen crowdbasierter Ideenbewertung - Ein systematischer Literaturüberblick ER - TY - GEN AU - Milder, Christoph ID - 13748 TI - Externe Stimuli zur Geschäftsmodell-Ideengenerierung: Ein Experimenteller Ansatz ER - TY - CHAP AU - Karsten, Andrea ED - Wymann, Christian ID - 32157 T2 - Praxishandbuch Schreibdidaktik. Übungen zur Vermittlung wissenschaftlicher Schreibkompetenzen TI - Blätterwald zur Positionierung in akademischen Texten ER - TY - JOUR AB - RbInSe2 is attracting growing interest as a secondary semiconductor compound in Cu(In,Ga)Se2-based solar cells by virtue of the recent investigations on absorber post-deposition treatments with alkali metal salts that have resulted in significant efficiency improvements. However, the detection of the RbInSe2 phase on the surface of chalcopyrite absorbers is very challenging due to its nanometric thickness and the limited information available about its fundamental properties. In this context, this work expounds a detailed analysis of the vibrational properties of RbInSe2 that combines first-principle calculations with multiwavelength Raman scattering spectroscopy and provides a methodology for the detection and identification of very thin layers of this material employing solely optical measurements. As a result, here, we present the classification of the different vibrational modes together with the fingerprint Raman spectra of RbInSe2 thin films measured under five different excitations (close to and far from resonance). The employment of a 442 nm excitation wavelength is found to be the most adequate strategy for the detection and characterization of the RbInSe2 phase in view of its resonance with the band gap of the material and its low penetration depth. Additionally, the purity of the deposited thin films as well as the possible influence of the subjacent layers on the Raman spectra of the compound are also investigated by analyzing the presence of secondary phases and by measuring RbInSe2 thin films deposited onto Mo-coated soda-lime glass, respectively. These results set the basis for the future evaluation of the suitability of Raman spectroscopy as a fast and nondestructive characterization technique for the reliable identification and characterization of the nanometric layers of RbInSe2 in Cu(In,Ga)Se2-based solar cells. AU - Guc, Maxim AU - Kodalle, Tim AU - Kormath Madam Raghupathy, Ramya AU - Mirhosseini, Hossein AU - Kühne, Thomas AU - Becerril-Romero, Ignacio AU - Pérez-Rodríguez, Alejandro AU - Kaufmann, Christian A. AU - Izquierdo-Roca, Victor ID - 15723 JF - The Journal of Physical Chemistry C SN - 1932-7447 TI - Vibrational Properties of RbInSe2: Raman Scattering Spectroscopy and First-Principle Calculations ER - TY - JOUR AB - The behavior of alkali atom point defects in polycrystalline CuInSe2 is studied. In this work, three grain boundary models, one coherent twin boundary and two twin boundaries with dislocation cores, are considered. Total energy calculations show that all alkali metals tend to segregate at the grain boundaries. In addition, the segregation of alkali atoms is more pronounced at the grain boundaries with the dislocation cores. The diffusion of alkali metals along and near grain boundaries is studied as well. The results show that the diffusion of alkali atoms in the grain boundary models is faster than within the bulk. In addition, the ion exchange between Na and Rb atoms at the grain boundaries leads to the Rb enrichment at the grain boundaries and the increase of the Na concentration in the bulk. While the effects of Na and Rb point defects on the electronic structure of the grain boundary with the anion-core dislocation are similar, Rb atoms passivate the grain boundary with the cation-core dislocation more effectively than Na. This can explain the further improvement of the solar cell performance after the RbF-postdeposition treatment. AU - Chugh, Manjusha AU - Kühne, Thomas D. AU - Mirhosseini, Hossein ID - 13230 IS - 16 JF - ACS Applied Materials & Interfaces TI - Diffusion of Alkali Metals in Polycrystalline CuInSe2 and Their Role in the Passivation of Grain Boundaries VL - 11 ER - TY - JOUR AB - The behavior of alkali atom point defects in polycrystalline CuInSe2 is studied. In this work, three grain boundary models, one coherent twin boundary and two twin boundaries with dislocation cores, are considered. Total energy calculations show that all alkali metals tend to segregate at the grain boundaries. In addition, the segregation of alkali atoms is more pronounced at the grain boundaries with the dislocation cores. The diffusion of alkali metals along and near grain boundaries is studied as well. The results show that the diffusion of alkali atoms in the grain boundary models is faster than within the bulk. In addition, the ion exchange between Na and Rb atoms at the grain boundaries leads to the Rb enrichment at the grain boundaries and the increase of the Na concentration in the bulk. While the effects of Na and Rb point defects on the electronic structure of the grain boundary with the anion-core dislocation are similar, Rb atoms passivate the grain boundary with the cation-core dislocation more effectively than Na. This can explain the further improvement of the solar cell performance after the RbF-postdeposition treatment. AU - Chugh, Manjusha AU - Kühne, Thomas AU - Mirhosseini, S. Hossein ID - 15726 JF - ACS Applied Materials & Interfaces SN - 1944-8244 TI - Diffusion of Alkali Metals in Polycrystalline CuInSe2 and Their Role in the Passivation of Grain Boundaries ER - TY - JOUR AB - Adaptive kinetic Monte Carlo simulation (aKMC) is employed to study the dynamics and the diffusion of point defects in the CuInSe2 lattice. The aKMC results show that lighter alkali atoms can diffuse into the CuInSe2 grains, whereas the diffusion of heavier alkali atoms is limited to the Cu-poor region of the absorber. The key difference between the diffusion of lighter and heavier alkali elements is the energy barrier of the ion exchange between alkali interstitial atoms and Cu. For lighter alkali atoms like Na, the interstitial diffusion and the ion-exchange mechanism have comparable energy barriers. Therefore, Na interstitial atoms can diffuse into the grains and replace Cu atoms in the CuInSe2 lattice. In contrast to Na, the ion-exchange mechanism occurs spontaneously for heavier alkali atoms like Rb and the further diffusion of these atoms depends on the availability of Cu vacancies. The outdiffusion of alkali substitutional atoms from the grains results in the formation of Cu vacancies which in turn increases the hole concentration in the absorber. In this respect, Na is more efficient than Rb due to the higher concentration of Na substitutional defects in the CuInSe2 grains. AU - Kormath Madam Raghupathy, Ramya AU - Kühne, Thomas AU - Henkelman, Graeme AU - Mirhosseini, Hossein ID - 15725 JF - Advanced Theory and Simulations SN - 2513-0390 TI - Alkali Atoms Diffusion Mechanism in CuInSe 2 Explained by Kinetic Monte Carlo Simulations ER - TY - CONF AB - Artificial intelligence (AI) has the potential for far-reaching – in our opinion – irreversible changes. They range from effects on the individual and society to new societal and social issues. The question arises as to how students can learn the basic functioning of AI systems, what areas of life and society are affected by these and – most important – how their own lives are affected by these changes. Therefore, we are developing and evaluating school materials for the German ”Science Year AI”. It can be used for students of all school types from the seventh grade upwards and will be distributed to about 2000 schools in autumn with the support of the Federal Ministry of Education and Research. The material deals with the following aspects of AI: Discussing everyday experiences with AI, how does machine learning work, historical development of AI concepts, difference between man and machine, future distribution of roles between man and machine, in which AI world do we want to live and how much AI would we like to have in our lives. Through an accompanying evaluation, high quality of the technical content and didactic preparation is achieved in order to guarantee the long-term applicability in the teaching context in the different age groups and school types. In this paper, we describe the current state of the material development, the challenges arising, and the results of tests with different classes to date. We also present first ideas for evaluating the results. AU - Schlichtig, Michael AU - Opel, Simone Anna AU - Budde, Lea AU - Schulte, Carsten ED - Jasutė, Eglė ED - Pozdniakov, Sergei ID - 15332 KW - Artificial Intelligence KW - Machine Learning KW - Teaching Material KW - Societal Aspects KW - Ethics. Social Aspects KW - Science Year KW - Simulation Game SN - 978-9925-553-27-3 T2 - ISSEP 2019 - 12th International conference on informatics in schools: Situation, evaluation and perspectives, Local Proceedings TI - Understanding Artificial Intelligence – A Project for the Development of Comprehensive Teaching Material VL - 12 ER - TY - CONF AU - Opel, Simone Anna AU - Schlichtig, Michael AU - Schulte, Carsten AU - Biehler, Rolf AU - Frischemeier, Daniel AU - Podworny, Susanne AU - Wassong, Thomas ID - 15640 T2 - INFOS TI - Entwicklung und Reflexion einer Unterrichtssequenz zum Maschinellen Lernen als Aspekt von Data Science in der Sekundarstufe II VL - P-288 ER - TY - CONF AU - Schlichtig, Michael AU - Opel, Simone Anna AU - Schulte, Carsten AU - Biehler, Rolf AU - Frischemeier, Daniel AU - Podworny, Susanne AU - Wassong, Thomas ID - 15641 T2 - INFOS TI - Maschinelles Lernen im Unterricht mit Jupyter Notebook VL - P-288 ER - TY - CONF AU - Opel, Simone Anna AU - Schlichtig, Michael AU - Schulte, Carsten ID - 15643 T2 - WiPSCE TI - Developing Teaching Materials on Artificial Intelligence by Using a Simulation Game (Work in Progress) ER - TY - GEN AU - Tönsing, Johanna ID - 32431 T2 - Grundschulunterricht Deutsch 3 (2019) TI - Daniel Napp: Das schlaue Buch vom Büchermachen ER - TY - JOUR AU - Mäck, Markus AU - Caylak, Ismail AU - Edler, Philipp AU - Freitag, Steffen AU - Hanss, Michael AU - Mahnken, Rolf AU - Meschke, Günther AU - Penner, Eduard ID - 19300 JF - GAMM-Mitteilungen SN - 0936-7195 TI - Optimization with constraints considering polymorphic uncertainties ER - TY - JOUR AU - Sun, Jingjiang AU - Rust, Tarik AU - Kuckling, Dirk ID - 30926 IS - 22 JF - Macromolecular Rapid Communications KW - Materials Chemistry KW - Polymers and Plastics KW - Organic Chemistry SN - 1022-1336 TI - Light‐Responsive Serinol‐Based Polyurethane Nanocarrier for Controlled Drug Release VL - 40 ER -