@inproceedings{GoryachkoBeuckertZaumseiletal., author = {Goryachko, Andriy and Beuckert, Guido and Zaumseil, Peter and Wagner, Guenter and Schmeißer, Dieter}, title = {Investigations of Pr2O3 growth modes on 4H-SiC(0001) Surfaces}, series = {Verhandlungen der Deutschen Physikalischen Gesellschaft}, booktitle = {Verhandlungen der Deutschen Physikalischen Gesellschaft}, publisher = {Deutsche Physikalische Gesellschaft}, address = {Bad Honnef}, isbn = {ISSN 0420-0195}, abstract = {The SiC is suited especially well for high power and high voltage semiconductor devices. In order to increase the reliability against electrical breakdown of metal-insulator-semiconductor (MIS) structures, one needs to use the insulator with possibly higher dielectric constant. Pr2O3 is shown to posses a much higher dielectric constant (equals 30) than traditionally used SiO2. Therefore, Pr2O3/SiC is an excellent material combination for high voltage MIS devices. The 4H-SiC(0001) substrates are characterised with scanning tunneling microscopy, while the Pr2O3 surface - with atomic force microscopy technique. We show distinct growth modes of Pr2O3 film, such as 3D and layer by layer growth. The crystalline structure and film thickness are determined by X-ray diffraction and its chemical composition by X-ray photoelectron spectroscopy. The Pr2O3 film characteristics are optimised for high-quality MIS structures in terms of lateral uniformity, low interface states density and leakage current, as well as physical integrity.}, language = {en} } @inproceedings{HendlerExtraLockanetal., author = {Hendler, Marco and Extra, Simon and Lockan, Michael and Bestle, Dieter and Flassig, Peter Michael}, title = {Compressor Design in the Context of Holistic Aero Engine Design}, series = {2017 AIAA Aviation Forum, Denver, AIAA-2017-3334, 2017}, booktitle = {2017 AIAA Aviation Forum, Denver, AIAA-2017-3334, 2017}, doi = {10.2514/6.2017-3334}, language = {en} } @inproceedings{LutterHempelDieteretal., author = {Lutter, Anne-Helen and Hempel, Ute and Dieter, Peter and Anderer, Ursula}, title = {Cost-efficient diagnostic platform to measure osteoclast activity}, series = {35. Jahrestagung der Deutschen Gesellschaft f{\"u}r Klinische Mikrozirkulation und H{\"a}morheologie, Mainz, 2016}, booktitle = {35. Jahrestagung der Deutschen Gesellschaft f{\"u}r Klinische Mikrozirkulation und H{\"a}morheologie, Mainz, 2016}, doi = {10.13140/RG.2.2.10550.19528}, language = {en} } @inproceedings{KotKegelmannKusetal., author = {Kot, Małgorzata and Kegelmann, Lukas and Kus, Peter and Tsud, Nataliya and Matol{\´i}nov{\´a}, Iva and Albrecht, Steve and Matolin, Vladimir and Schmeißer, Dieter}, title = {Room temperature atomic layer deposition for perovskite solar cells}, series = {Verhandlungen der Deutschen Physikalischen Gesellschaft, Reihe 6, Band 53,3}, booktitle = {Verhandlungen der Deutschen Physikalischen Gesellschaft, Reihe 6, Band 53,3}, publisher = {Deutsche Physikalische Gesellschaft}, address = {Bad Honnef}, issn = {0420-0195}, pages = {S. 174}, abstract = {After few years of efficiency driven research on perovskite solar cells, the focus now is shifting to understand the underlying processes governing the high efficiency and also to obtain long-term stable devices. Among various deposition methods, atomic layer deposition (ALD) may represent one of the best options, being possible to coat substrates in a very efficient way and at very low temperatures. In our previous work [1] we reported that the efficiency of the solar cell containing aged perovskite film can be enhanced twice while covering the perovskite with a thin ALD alumina film at room temperature. In this work, the chemical, electronic and morphological properties of the fresh perovskite film treated by ALD pulses of the trimethylaluminium and water at room temperature investigated using X-ray Photoelectron Spectroscopy and Field Emission Scanning Electron Microscopy will be discused and correlated with the solar cells performance and stability. [1] M. Kot et al., ChemSusChem 2016, 9, 3401.}, language = {en} } @inproceedings{HendlerBestleFlassig, author = {Hendler, Marco and Bestle, Dieter and Flassig, Peter Michael}, title = {Cloning Strategy for Aerodynamic Compressor Design based on Throughflow Analysis}, series = {Proceedings of Montreal 2018, Global Power and Propulsion Forum, 7-9.05.2018}, booktitle = {Proceedings of Montreal 2018, Global Power and Propulsion Forum, 7-9.05.2018}, pages = {8}, abstract = {Due to their high complexity, aero engine development is a time-consuming and cost-intensive process. Therefore, pre-developed proven aerodynamic and geometric compressor information is often used as starting point and transferred to new compressor designs. In the present paper, a new approach for aerodynamic cloning of an already existing compressor flow to a new compressor geometry by use of a streamline curvature based Throughflow solver is presented. Parameterized compressor quantities are automatically modified with the help of optimization strategies, and the resulting compressor aerodynamics are compared to a reference design in each iteration step. The target is to minimize the discrepancy between reference design and new design regarding essential flow parameters like de Haller number, Mach number etc., and thereby to reproduce the aerodynamic image of the reference design. Thus, already collected experience from existing compressor flow fields can be used to reduce costs for developing as well as testing of new compressor configurations. Conducted investigations show a notable acceleration of the design process in comparison to former strategies starting from scratch while achieving an acceptable compliance of aerodynamic parameters.}, language = {en} } @inproceedings{ExtraLockanBestleetal., author = {Extra, Simon and Lockan, Michael and Bestle, Dieter and Flassig, Peter Michael}, title = {A Comparison of Strategies for Efficient Core Engine Optimization with Coupled Subsystems}, series = {Proceedings of Montreal 2018, Global Power and Propulsion Forum, 7-9.05.2018}, booktitle = {Proceedings of Montreal 2018, Global Power and Propulsion Forum, 7-9.05.2018}, pages = {8}, abstract = {The present paper compares four different optimization strategies for decoupled optimization in the context of preliminary core engine design for aero engines. An optimization with the AAO (All-At-Once) approach is performed as a baseline and compared against the performance and results of three cascaded optimization strategies: CO (Collaborative Optimization), BLISS 2000 (Bi-Level Integrated System Synthesis) and ISOC (Interface Segmentation Optimization Concept). The optimization problem is based on a thermodynamic core engine model representing an industrial application example. The results are assessed with respect to typical requirements for multidisciplinary core engine design. The impact of the used optimization strategy on the performance of the optimization concept is investigated and discussed.}, language = {en} } @inproceedings{ExtraLockanBestleetal., author = {Extra, Simon and Lockan, Michael and Bestle, Dieter and Flassig, Peter Michael}, title = {Coupled Subsystem Optimization for Preliminary Core Engine Design}, series = {Evolutionary and deterministic methods for design optimization and control with applications to industrial and societal problems, Sep. 13-15, 2017 in Madrid, Spain, EUROGEN 2017, Book of abstracts}, booktitle = {Evolutionary and deterministic methods for design optimization and control with applications to industrial and societal problems, Sep. 13-15, 2017 in Madrid, Spain, EUROGEN 2017, Book of abstracts}, publisher = {Technical University}, address = {Madrid}, isbn = {978-84-697-5112-1}, language = {en} } @inproceedings{ExtraLockanBestleetal., author = {Extra, Simon and Lockan, Michael and Bestle, Dieter and Flassig, Peter Michael}, title = {Coupled Subsystem Optimiziation for Preliminary Core Engine Design}, series = {Evolutionary and Deterministic Methods for Design Optimization and Control With Applications to Industrial and Societal Problems}, booktitle = {Evolutionary and Deterministic Methods for Design Optimization and Control With Applications to Industrial and Societal Problems}, editor = {Andr{\`e}s-P{\`e}rez, Esther and Gonz{\´a}lez, Leo M. and Periaux, Jacques and Gauger, Nicolas R. and Quagliarella, Domenico and Giannakoglou, Kyriakos C.}, publisher = {Springer International Publishing}, address = {Cham}, isbn = {978-3-319-89889-6}, doi = {10.1007/978-3-319-89890-2_33}, pages = {513 -- 527}, language = {en} }