TY - CHAP A1 - Extra, Simon A1 - Lockan, Michael A1 - Bestle, Dieter A1 - Flassig, Peter Michael T1 - Coupled Subsystem Optimization for Preliminary Core Engine Design T2 - 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 Y1 - 2017 SN - 978-84-697-5112-1 PB - Technical University CY - Madrid ER - TY - GEN A1 - Hendler, Marco A1 - Bestle, Dieter A1 - Flassig, Peter Michael T1 - Component-specific Engine Design Taking into Account Holistic Design Aspects T2 - International Journal of Turbomachinery, Propulsion and Power Y1 - 2018 U6 - https://doi.org/10.3390/ijtpp3020012 SN - 2504-186X N1 - This article belongs to the Special Issue Selected Papers from the 17th International Symposium on Transport Phenomena and Dynamics of Rotating Machinery VL - 3 IS - 2 SP - 1 EP - 16 ER - TY - CHAP A1 - Extra, Simon A1 - Lockan, Michael A1 - Bestle, Dieter A1 - Flassig, Peter Michael ED - Andrès-Pèrez, Esther ED - González, Leo M. ED - Periaux, Jacques ED - Gauger, Nicolas R. ED - Quagliarella, Domenico ED - Giannakoglou, Kyriakos C. T1 - Coupled Subsystem Optimiziation for Preliminary Core Engine Design T2 - Evolutionary and Deterministic Methods for Design Optimization and Control With Applications to Industrial and Societal Problems Y1 - 2018 SN - 978-3-319-89889-6 SN - 978-3-319-89890-2 U6 - https://doi.org/10.1007/978-3-319-89890-2_33 SP - 513 EP - 527 PB - Springer International Publishing CY - Cham ER - TY - GEN A1 - Kot, Małgorzata A1 - Kegelmann, Lukas A1 - Das, Chittaranjan A1 - Kus, Peter A1 - Tsud, Nataliya A1 - Matolínová, Iva A1 - Albrecht, Steve A1 - Matolin, Vladimir A1 - Schmeißer, Dieter T1 - Room temperature atomic layer deposited Al₂O₃ improves perovskite solar cells efficiency over time T2 - ChemSusChem N2 - Electrical characterisation of perovskite solar cells consisting of room-temperature atomic-layer-deposited aluminium oxide (RT-ALD-Al₂O₃) film on top of a methyl ammonium lead triiodide (CH₃NH₃PbI₃) absorber showed excellent stability of the power conversion efficiency (PCE) over along time. Under the same environmental conditions (for 355 d), the average PCE of solar cells without the ALD layer decreased from 13.6 to 9.6 %, whereas that of solar cells containing 9 ALD cycles of depositing RT-ALD-Al₂O₃on top of CH₃NH₃PbI₃ increased from 9.4 to 10.8 %. Spectromicroscopic investigations of the ALD/perovskite interface revealed that the maximum PCE with the ALD layer is obtained when the so-called perovskite cleaning process induced by ALD precursors is complete. The PCE enhancement over time is probably related to a self-healing process induced by the RT-ALD-Al₂O₃ film. This work may provide a new direction for further improving the long-term stability and performance of perovskite solar cells. KW - Perovskite Solar Cells (PSCs) KW - Atomic layer deposition (ALD) KW - long time stabilty KW - X-Ray photoelectron spectroscopy (XPS) KW - Field-emission scanning electron microscopy (FESEM) Y1 - 2018 U6 - https://doi.org/10.1002/cssc.201801434 SN - 1864-5631 SN - 1864-564X VL - 11 IS - 20 SP - 3640 EP - 3648 ER - TY - GEN A1 - Extra, Simon A1 - Hendler, Marco A1 - Bestle, Dieter A1 - Flassig, Peter Michael T1 - Verbesserte Vorauslegung des Kerntriebwerks mithilfe eines kaskadierten Optimierungsprozesses T2 - Luft- und Raumfahrt - Digitalisierung und Vernetzung, Deutscher Luft- und Raumfahrtkongress 2018, 04.-06. September 2018, Friedrichshafen, Graf-Zeppelin-Haus Y1 - 2018 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:101:1-2020011711475557798029 UR - https://www.dglr.de/publikationen/2020/480163.pdf N1 - DLRK2018-480163 PB - Deutsche Gesellschaft für Luft- und Raumfahrt - Lilienthal-Oberth e.V. CY - Bonn ER - TY - GEN A1 - Kot, Małgorzata A1 - Henkel, Karsten A1 - Naumann, Franziska A1 - Gargouri, Hassan A1 - Tarnawska, Lidia Lupina A1 - Wilker, Viola A1 - Kus, Peter A1 - Pożarowska, Emilia A1 - Garain, Samiran A1 - Rouissi, Zied A1 - Schmeißer, Dieter T1 - Comparison of plasma-enhanced atomic layer deposition AlN films prepared with different plasma sources T2 - Journal of Vacuum Science and Technology A N2 - A comparative study of thin aluminum nitride (AlN) films deposited by plasma-enhanced atomic layer deposition in the SENTECH SI ALD LL system applying either a direct inductively coupled plasma (ICP) or an indirect capacitively coupled plasma (CCP) source is presented. The films prepared with the ICP source (based on a planar triple spiral antenna) exhibit improved properties concerning the growth rate per cycle, total cycle duration, homogeneity, refractive index, fixed and mobile electrical charges, and residual oxygen content compared to the CCP source, where the comparison is based on the applied plasma power of 200 W. The increase of the plasma power to 600 W in the ICP process significantly reduces the residual oxygen content and enhances the electrical breakdown field. The AlN layers grown under these conditions, with a growth rate per cycle of 1.54 Å/cycle, contain residual oxygen and carbon concentrations of about 10% and 4%, respectively, and possess a refractive index of 2.07 (at 632.8 nm). KW - Plamsa-enhanced atomic layer deposition (PEALD) KW - inductively coupled KW - capacitively coupled KW - plamsa source KW - ellipsometry KW - X-ray photoelectron spectroscopy (XPS) KW - X-ray diffraction (XRD) KW - Field emission scanning electron microscopy (FESEM) KW - capacitance-voltage (CV) KW - atomic force microscopy Y1 - 2019 U6 - https://doi.org/10.1116/1.5079628 SN - 0734-2101 SN - 1520-8559 VL - 37 IS - 2 ER - TY - GEN A1 - Kot, Małgorzata A1 - Henkel, Karsten A1 - Müller, Klaus A1 - Kegelmann, Lukas A1 - Albrecht, Steve A1 - Tsud, Nataliya A1 - Kús, Peter A1 - Matolinová, Iva A1 - Schmeißer, Dieter T1 - Al2O3-Atomic Layer Deposited Films on CH3NH3PbI3 : Intrinsic Defects and Passivation Mechanisms T2 - Energy Technology , The Journal of Physical Chemistry C N2 - The initial interaction of atomic layer deposited films of Al2O3 at room temperature on CH3NH3PbI3 (MAPI) films is studied. Synchrotron radiation–based photoelectron spectroscopy is applied to analyze the initial changes in the Al-derived features by comparing samples with different Al2O3 film thicknesses. It is found that polarons and excitons, both intrinsic defects of Al2O3, play a key role in the interface formation. The polaronic states uptake a charge from the MAPI substrate. This charge is transferred to and stabilized in the excitonic state of Al2O3 which is assigned to predominately tetrahedral coordinated Al sites. This charge transfer is initiated by vacancies present in the MAPI substrate and stabilizes a covalent bonding at the Al2O3–MAPI interface but also causes a roughening of the interface which may lead to the formation of grain boundaries. On top of the rough interface, 2D Al2O3 clusters with an increasing number of octahedrally coordinated Al—O bonds grow, and with increasing Al2O3 coverage, they introduce self-healing of the structural defects. KW - charge donation and transfer cycles KW - covalent interfaces KW - defect monitoring KW - model of Al2O3–CH3NH3PbI3 interactions KW - resonant photoelectron spectroscopy Y1 - 2019 U6 - https://doi.org/10.1002/ente.201900975 SN - 2194-4288 SN - 2194-4296 VL - 7 IS - 11 ER - TY - GEN A1 - Urbano, Josè A1 - Bestle, Dieter A1 - Gerstberger, Ulf A1 - Flassig, Peter Michael T1 - Low-Order Representation of Manufacturing Variations Based on B-Spline Morphing T2 - ASME 2019 International Mechanical Engineering Congress and Exposition, November 11–14, 2019 Salt Lake City, Utah, USA Y1 - 2020 UR - https://asmedigitalcollection.asme.org/IMECE/proceedings-abstract/IMECE2019/59384/V02BT02A053/1072900 SN - 978-0-7918-5938-4 U6 - https://doi.org/10.1115/IMECE2019-10294 PB - American Society of Mechanical Engineers ER - TY - RPRT A1 - Müller, Jörg A1 - Dieter, M. A1 - Bauhus, J. A1 - Spellmann, H. A1 - Möhring, B. A1 - Wagner, S. A1 - Wolf, Heino A1 - Niekisch, M. A1 - Weiger, H. A1 - Feindt, Peter H. A1 - Hamm, Ulrich A1 - Wätzold, Frank A1 - Wolters, Volkmar A1 - Engels, Eve-Marie A1 - Schraml, U. A1 - Lang, F. A1 - Pröbstl-Haider, U. A1 - Richter, K. T1 - Wege zu einem effizienten Waldnaturschutz in Deutschland. Stellungnahme Y1 - 2020 UR - http://www.fnr.de/fileadmin/allgemein/pdf/Effizienter_Waldnaturschutz_in_Deutschland.pdf PB - Wissenschaftlicher Beirat Waldpolitik und Wissenschaftlicher Beirat Biodiversität und Genetische Ressourcen beim BMEL ER - TY - GEN A1 - Kot, Małgorzata A1 - Kegelmann, Lukas A1 - Köbler, Hans A1 - Vorokhta, Mykhailo A1 - Escudero, Carlos A1 - Kúš, Peter A1 - Šmíd, Břetislav A1 - Tallarida, Massimo A1 - Albrecht, Steve A1 - Abate, Antonio A1 - Matolínová, Iva A1 - Schmeißer, Dieter A1 - Flege, Jan Ingo T1 - In situ Near-Ambient Pressure X-ray Photoelectron Spectroscopy Reveals the Influence of Photon Flux and Water on the Stability of Halide Perovskite T2 - ChemSusChem N2 - For several years, scientists have been trying to understand the mechanisms that reduce the long‐term stability of perovskite solar cells. In this work, we examined the effect of water and photon flux on the stability of CH3NH3PbI3 perovskite films and solar cells using in situ near‐ambient pressure X‐ray photoelectron spectroscopy (NAP‐XPS), field emission scanning electron microscopy (FESEM), and current density–voltage (J–V) characterization. The used amount of water vapor (up to 1 mbar) had a negligible impact on the perovskite film. The higher the photon flux, the more prominent were the changes in the NAP‐XPS and FESEM data; also, a faster decline in power conversion efficiency (PCE) and a more substantial hysteresis in the J‐V characteristics were observed. Based on our results, it can be concluded that the PCE decrease originates from the creation of Frenkel pair defects in the perovskite film under illumination. The stronger the illumination, the higher the number of Frenkel defects, leading to a faster PCE decline and more substantial hysteresis in the J‐V sweeps. KW - field emission scanning electron microscopy (FESEM) KW - Frenkel defects KW - near-ambient pressure X-ray photoelectron spectroscopy (NAP-XPS) KW - perovskite KW - photon-induced degradation Y1 - 2020 U6 - https://doi.org/10.1002/cssc.202001527 SN - 1864-5631 SN - 1864-564X VL - 13 IS - 21 SP - 5722 EP - 5730 ER - TY - GEN A1 - Weber, Franziska A1 - Müller, Carsten A1 - Grünberg, Christian A1 - Thiel, Christian A1 - Bahns, Carolin A1 - Brannath, Werner A1 - Dietrich, Freya A1 - Dieter, Valerie A1 - Färber, Francesca A1 - Gellert, Paul A1 - Kloek, Corelien A1 - Kloep, Stephan A1 - Kopkow, Christian A1 - Krauß, Inga A1 - Rasche, Peter A1 - Rothgang, Heinz A1 - Veenhof, Cindy A1 - Vollmar, Horst Christian A1 - Peschke, Dirk T1 - Smartphone-assistiertes Trainings- und Edukationsprogramm für Menschen mit Hüft- und/oder Kniearthrose (SmArt-E): Studienprotokoll für eine multizentrische, randomisierte, kontrollierte Studie T2 - 21. Deutscher Kongress für Versorgungsforschung (DKVF), 05.10. - 07.10.2022, Potsdam Y1 - 2022 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:0183-22dkvf2836 ER - TY - GEN A1 - Lützner, Jörg A1 - Deckert, Stefanie A1 - Lange, Toni A1 - Postler, Anne Elisabeth A1 - Aringer, Martin A1 - Berth, Hendrik A1 - Bork, Hartmut A1 - Dreinhöfer, Karsten E A1 - Günther, Klaus-Peter A1 - Heller, Karl-Dieter A1 - Hube, Robert A1 - Kirschner, Stephan A1 - Kladny, Bernd A1 - Kopkow, Christian A1 - Sabatowski, Rainer A1 - Stoeve, Johannes A1 - Wagner, Richard A1 - Lützner, Cornelia T1 - Evidenzbasierte und patientenorientierte Indikationsstellung zur Knieendoprothese – Update der Leitlinie T2 - Zeitschrift für Orthopädie und Unfallchirurgie N2 - ZusammenfassungDie Implantation einer Knieendoprothese zählt mit ca. 170000 Eingriffen pro Jahr zu den am häufigsten stationär durchgeführten Operationen in Deutschland. Eine einheitliche, angemessene und patientenorientierte ärztliche Indikationsstellung ist bei einem solchen Eingriff unerlässlich. Das Update der S2k-Leitlinie „Indikation Knieendoprothese“ beinhaltet auf aktueller Evidenz basierende und im breiten Konsens abgestimmte Empfehlungen und eine Checkliste im praxistauglichen Format.Für dieses Leitlinien-Update wurde eine systematische Literaturrecherche nach (inter-)nationalen Leitlinien und systematischen Übersichtsarbeiten zur Gonarthrose und Knieendoprothetik durchgeführt, um klinisch relevante Fragestellungen zu Diagnostik, Prädiktoren für das Outcome, Risikofaktoren und Kontraindikatoren zu beantworten.Eine Knieendoprothese soll nur bei radiologisch nachgewiesener fortgeschrittener Gonarthrose (Kellgren-Lawrence-Grad 3 oder 4), nach vorangegangener konservativer Therapie über mindestens 3 Monate sowie bei hohem subjektivem Leidensdruck hinsichtlich der kniebezogenen Beschwerden und nach Ausschluss möglicher Kontraindikationen (Infektionen, Begleiterkrankungen, BMI ≥ 40 kg/m2) erfolgen. Modifizierbare Risikofaktoren (wie Rauchen, Diabetes mellitus, Anämie) sollen zuvor adressiert und ggf. optimiert werden. Die Ziele der Patient*innen sollen erfragt und deren Eintrittswahrscheinlichkeit gemeinsam besprochen werden. Schließlich ist die Entscheidung zur Knieendoprothese von Patient*in und Operateur*in gemeinsam zu treffen, wenn der zu erwartende Nutzen die möglichen Risiken überwiegt.Das Update der S2k-Leitlinie wurde um die unikondyläre Knieendoprothese erweitert, die präoperative Optimierung modifizierbarer Risikofaktoren ergänzt sowie Konkretisierungen der Hauptindikationskriterien vorgenommen. Y1 - 2024 U6 - https://doi.org/10.1055/a-2288-7254 SN - 1864-6697 PB - Georg Thieme Verlag KG ER - TY - GEN A1 - Röder, Benedict A1 - Hajipour, Sanam A1 - Ebel, Henrik A1 - Eberhard, Peter A1 - Bestle, Dieter T1 - Automated design of a four-bar mechanism starting from hand drawings of desired coupler trajectories and velocity profiles T2 - Mechanics based design of structures and machines N2 - When a specific, relatively simple motion must be executed with high precision and high speed, simple mechanisms like the four-bar linkage are often the first choice. Combined with control of the crank speed, these systems are able to move the end-effector with any changing speed. Designing a certain mechanism for a pre-defined trajectory, however, usually requires an expert, which is why automatic design by a design assistant system is desirable. Modern AI methods may support such an automatic design, which shall function only based on hand drawings of the desired path and a corresponding velocity profile. For a planar four-bar mechanism, which serves only as an example, this article proposes a general data-driven procedure where first the geometry of a mechanism is synthesized by machine learning such that the track point follows approximately the desired trajectory. Then, the kinematic relation between the track point’s velocity profile and the crank’s angular velocity is learned. This learned inverse kinematics model may be applied to an arbitrary user-defined velocity profile of the track point. Finally, a controller governing the crank torque is designed purely based on data to track the resulting angular crank velocity. Not every drawn motion can necessarily be realized with a mechanism; however, the goal is to identify a mechanism that approximates the drawn curve as accurately as possible. While various design toolboxes already exist, especially for the design of four-bar linkages, this article presents a design pipeline using data-driven approaches that solely learn from forward simulation data. This nurtures the hope that presented approach is also applicable to more complex systems where analytic formulations cannot be easily derived. KW - Design assistant KW - Mechanism design KW - Four-bar linkage KW - Inverse kinematics KW - Machine learning KW - Tracking control Y1 - 2025 U6 - https://doi.org/10.1080/15397734.2025.2543559 SN - 1539-7742 VL - 2025 SP - 1 EP - 25 PB - Taylor & Francis CY - Philadelphia, Pa. ER - TY - GEN A1 - Henkel, Clara A1 - Bestle, Dieter A1 - Flassig, Peter A1 - Janke, Christian A1 - Slaby, Michael T1 - Consideration of balancing within the fan-blisk design process T2 - GPPS Shanghai25 Technical Paper Proceedings N2 - The design of fan-blisks is a multi-criterion optimisation challenge primarily involving the aerodynamic shape optimisation of blade profiles and subsequent blade balancing, i.e., shifting profiles in axial and circumferential directions to avoid stress hotspots. Although it is already known that blade balancing affects aerodynamic properties, this correlation is often not taken into account, which is why it is usually performed as an independent step after solving the aerodynamic design problem. However, this assumption is questionable because such shifts should be used to control both secondary flow effects and resulting stress. Therefore, the paper proposes problem formulations combining both aspects. Since optimisation requires costly numerical evaluations, machine learning methods are investigated to predict aerodynamic performance and stress constraints more efficiently. This enables a global optimisation process by reducing computational costs. Various different surrogate types are investigated, where stress constraints are formulated either as regression task predicting stress maxima, or as classification problem directly assessing design feasibility. Y1 - 2025 UR - https://gpps.global/gpps-shanghai25-proceedings/ U6 - https://doi.org/10.33737/gpps25-tc-017 SP - 1 EP - 9 PB - Global Power and Propulsion Society (GPPS) CY - Zug, Schweiz ER -