[{"author":[{"first_name":"Kerstin","last_name":"Drossel","id":"48921","full_name":"Drossel, Kerstin"},{"first_name":"Jan","id":"32467","full_name":"Niemann, Jan","last_name":"Niemann"},{"first_name":"Anna","last_name":"Oldak","full_name":"Oldak, Anna","id":"98273"},{"first_name":"Birgit","last_name":"Eickelmann","orcid":"0000-0001-6124-746X","full_name":"Eickelmann, Birgit","id":"40387"}],"date_created":"2025-02-07T06:53:08Z","publisher":"Springer Science and Business Media LLC","date_updated":"2025-06-10T09:05:24Z","doi":"10.1007/s35834-024-00468-z","title":"Basisdimensionen der Unterrichtsqualität im Kontext des Erwerbs digitaler Kompetenzen an resilienten Schulen","publication_status":"published","publication_identifier":{"issn":["2190-6890","2190-6904"]},"citation":{"ama":"Drossel K, Niemann J, Oldak A, Eickelmann B. Basisdimensionen der Unterrichtsqualität im Kontext des Erwerbs digitaler Kompetenzen an resilienten Schulen. Zeitschrift für Bildungsforschung. Published online 2025. doi:10.1007/s35834-024-00468-z","chicago":"Drossel, Kerstin, Jan Niemann, Anna Oldak, and Birgit Eickelmann. “Basisdimensionen der Unterrichtsqualität im Kontext des Erwerbs digitaler Kompetenzen an resilienten Schulen.” Zeitschrift für Bildungsforschung, 2025. https://doi.org/10.1007/s35834-024-00468-z.","ieee":"K. Drossel, J. Niemann, A. Oldak, and B. Eickelmann, “Basisdimensionen der Unterrichtsqualität im Kontext des Erwerbs digitaler Kompetenzen an resilienten Schulen,” Zeitschrift für Bildungsforschung, 2025, doi: 10.1007/s35834-024-00468-z.","apa":"Drossel, K., Niemann, J., Oldak, A., & Eickelmann, B. (2025). Basisdimensionen der Unterrichtsqualität im Kontext des Erwerbs digitaler Kompetenzen an resilienten Schulen. Zeitschrift für Bildungsforschung. https://doi.org/10.1007/s35834-024-00468-z","bibtex":"@article{Drossel_Niemann_Oldak_Eickelmann_2025, title={Basisdimensionen der Unterrichtsqualität im Kontext des Erwerbs digitaler Kompetenzen an resilienten Schulen}, DOI={10.1007/s35834-024-00468-z}, journal={Zeitschrift für Bildungsforschung}, publisher={Springer Science and Business Media LLC}, author={Drossel, Kerstin and Niemann, Jan and Oldak, Anna and Eickelmann, Birgit}, year={2025} }","mla":"Drossel, Kerstin, et al. “Basisdimensionen der Unterrichtsqualität im Kontext des Erwerbs digitaler Kompetenzen an resilienten Schulen.” Zeitschrift für Bildungsforschung, Springer Science and Business Media LLC, 2025, doi:10.1007/s35834-024-00468-z.","short":"K. Drossel, J. Niemann, A. Oldak, B. Eickelmann, Zeitschrift für Bildungsforschung (2025)."},"year":"2025","user_id":"40387","department":[{"_id":"462"}],"_id":"58531","language":[{"iso":"ger"}],"type":"journal_article","publication":"Zeitschrift für Bildungsforschung","status":"public","abstract":[{"text":"Zusammenfassung\r\n Die fortschreitende Digitalisierung stellt Schulen vor Herausforderungen, insbesondere bei der Nutzung digitaler Medien in unterrichtlichen Lehr- und Lernprozessen mit dem Ziel, den (über-) fachlichen Kompetenzerwerb aller Schüler*innen zu unterstützen. Betrachtet man die digitalen Kompetenzen, zeigt sich, dass auch diese sozialen Disparitäten unterliegen. Dennoch lassen sich in ICILS organisational resiliente Schulen identifizieren, deren Schüler*innen trotz herausfordernder Schüler*innenkomposition überdurchschnittliche digitale Kompetenzen erreichen. Studien, die fachspezifische Kompetenzen untersuchen, lassen erkennen, dass organisational resiliente Schulen gemeinsame Merkmale aufweisen. Ein Merkmal, das in diesem Zusammenhang bedeutsam erscheint, ist die Gestaltung von Unterrichtsqualitätsmerkmalen. Digitale Kompetenzen erscheinen diesbezüglich unerforscht, sodass der vorliegende Beitrag mittels Daten aus der BMBF-geförderten qualitativen ICILS-Vertiefungsstudie UneS-ICILS 2018 (Unerwartbar erfolgreiche Schulen im digitalen Wandel) Basisdimensionen von Unterrichtsqualität an resilienten Schulen in Bezug auf digitale Kompetenzen untersucht. Für die Analyse wurden 22 leitfadengestützte Interviews mit Lehrkräften und sieben Gruppeninterviews mit Schüler*innen im Hinblick auf eine ‚effiziente Klassenführung‘, ‚kognitive Aktivierung‘ und ‚konstruktive Unterstützung‘ inhaltsanalytisch ausgewertet. Im Ergebnis zeigt die Analyse der Dimension ‚effiziente Klassenführung‘, dass sich u. a. die Organisation und Struktur mittels digitaler Medien wie beispielsweise durch den Einsatz digitaler Lernplattformen als bedeutende Faktoren herausstellen. Hinsichtlich der ‚kognitiven Aktivierung‘ wird der Einsatz digitaler Tools für das Anknüpfen an individuelles Vorwissen als bedeutend hervorgehoben. Darüber hinaus zeigt sich bei der Dimension ‚konstruktive Unterstützung‘ die Förderung des selbstgesteuerten Lernens und das Ausbilden von Unterstützungsstrukturen zum (kooperativen) Lernen mit digitalen Medien als bedeutsam. Induktiv ergänzt wurde die Dimension ‚Inhaltswahl und selektive Fokussierung‘, die die hohe Relevanz des Erwerbs digitaler Kompetenzen im Unterricht an den resilienten Schulen verdeutlicht.","lang":"eng"}]},{"language":[{"iso":"ger"}],"_id":"63612","user_id":"56091","department":[{"_id":"450"}],"status":"public","type":"journal_article","publication":"KIWI-Journal ","title":"Kommunikation mit Familien im Kontext von Inklusion. 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AAAI Press. https://doi.org/10.1609/AAAI.V39I16.33893"},"page":"17223–17230","year":"2025"},{"publisher":"OMP / RUB","date_updated":"2026-01-28T10:07:36Z","volume":19,"author":[{"first_name":"Bardo","full_name":"Herzig, Bardo","id":"217","last_name":"Herzig"}],"date_created":"2025-09-24T08:01:00Z","title":"Soziale Medien als algorithmische Diskursmaschinen","doi":"10.46586/SLLD.429","publication_identifier":{"eisbn":["978-3-96955-049-6"],"eissn":["2701-0600"]},"publication_status":"published","year":"2025","intvolume":" 19","page":"43-61","citation":{"ama":"Herzig B. Soziale Medien als algorithmische Diskursmaschinen. In: Berg G, Franke B, eds. SLLD (B). Spachlich literatisches Lernen und Deutschdidaktik . Vol 19. Ambiguität und Algorithmus: Literatur in den Social Media. OMP / RUB; 2025:43-61. doi:10.46586/SLLD.429","ieee":"B. Herzig, “Soziale Medien als algorithmische Diskursmaschinen,” in SLLD (B). Spachlich literatisches Lernen und Deutschdidaktik , vol. 19, G. Berg and B. 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Mangeni, P. Bogere, H. Asiimwe, and C. Freitag, “Approaches to Community Learning in Microgrid Development,” in Sustainable Energy Development in East Africa: Interdisciplinary Approaches, C. Freitag, K. Temmen, B. Hehenkamp, T. Klaus, and S. Krauter, Eds. 2025, pp. 260–271.","ama":"Mangeni T, Bogere P, Asiimwe H, Freitag C. Approaches to Community Learning in Microgrid Development. In: Freitag C, Temmen K, Hehenkamp B, Klaus T, Krauter S, eds. Sustainable Energy Development in East Africa: Interdisciplinary Approaches. ; 2025:260-271.","apa":"Mangeni, T., Bogere, P., Asiimwe, H., & Freitag, C. (2025). Approaches to Community Learning in Microgrid Development. In C. Freitag, K. Temmen, B. Hehenkamp, T. Klaus, & S. Krauter (Eds.), Sustainable Energy Development in East Africa: Interdisciplinary Approaches (pp. 260–271).","short":"T. Mangeni, P. Bogere, H. Asiimwe, C. Freitag, in: C. Freitag, K. Temmen, B. Hehenkamp, T. Klaus, S. 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(2025). “...da gerade hier die allgemeinen Theorieen uns nur zu oft im Stiche lassen.” Rousseau in der Kritik gelehrter Frauen seiner Zeit . In E. Berner & Susann Hofbauer (Eds.), “Nicht die Wahrheit wird anerkennt” - Mathilde Vaerting (1884-1977) Deutungen, Ordnungen und Tradierungen in der Erziehungswissenschaft (1st ed., pp. 184–197). Verlag Julius Klinkhardt.","short":"S. Vochatzer, S. Engelman , in: E. Berner, Susann Hofbauer (Eds.), “Nicht die Wahrheit wird anerkennt” - Mathilde Vaerting (1884-1977) Deutungen, Ordnungen und Tradierungen in der Erziehungswissenschaft, 1st ed., Verlag Julius Klinkhardt, Heilbrunn, 2025, pp. 184–197.","mla":"Vochatzer, Stefanie, and Sebastian Engelman . “‘...da gerade hier die allgemeinen Theorieen uns nur zu oft im Stiche lassen.’ Rousseau in der Kritik gelehrter Frauen seiner Zeit .” “Nicht die Wahrheit wird anerkennt” - Mathilde Vaerting (1884-1977) Deutungen, Ordnungen und Tradierungen in der Erziehungswissenschaft, edited by Esther Berner and Susann Hofbauer , 1st ed., Verlag Julius Klinkhardt, 2025, pp. 184–97.","bibtex":"@inbook{Vochatzer_Engelman _2025, place={Heilbrunn}, edition={1}, title={“...da gerade hier die allgemeinen Theorieen uns nur zu oft im Stiche lassen.” Rousseau in der Kritik gelehrter Frauen seiner Zeit }, booktitle={“Nicht die Wahrheit wird anerkennt” - Mathilde Vaerting (1884-1977) Deutungen, Ordnungen und Tradierungen in der Erziehungswissenschaft}, publisher={Verlag Julius Klinkhardt}, author={Vochatzer, Stefanie and Engelman , Sebastian }, editor={ Berner, Esther and Hofbauer , Susann}, year={2025}, pages={184–197} }","ama":"Vochatzer S, Engelman S. “...da gerade hier die allgemeinen Theorieen uns nur zu oft im Stiche lassen.” Rousseau in der Kritik gelehrter Frauen seiner Zeit . In: Berner E, Hofbauer Susann, eds. “Nicht die Wahrheit wird anerkennt” - Mathilde Vaerting (1884-1977) Deutungen, Ordnungen und Tradierungen in der Erziehungswissenschaft. 1st ed. Verlag Julius Klinkhardt; 2025:184-197.","chicago":"Vochatzer, Stefanie, and Sebastian Engelman . “‘...da gerade hier die allgemeinen Theorieen uns nur zu oft im Stiche lassen.’ Rousseau in der Kritik gelehrter Frauen seiner Zeit .” In “Nicht die Wahrheit wird anerkennt” - Mathilde Vaerting (1884-1977) Deutungen, Ordnungen und Tradierungen in der Erziehungswissenschaft, edited by Esther Berner and Susann Hofbauer , 1st ed., 184–97. Heilbrunn: Verlag Julius Klinkhardt, 2025.","ieee":"S. Vochatzer and S. Engelman , “‘...da gerade hier die allgemeinen Theorieen uns nur zu oft im Stiche lassen.’ Rousseau in der Kritik gelehrter Frauen seiner Zeit ,” in “Nicht die Wahrheit wird anerkennt” - Mathilde Vaerting (1884-1977) Deutungen, Ordnungen und Tradierungen in der Erziehungswissenschaft, 1st ed., E. Berner and Susann Hofbauer , Eds. Heilbrunn: Verlag Julius Klinkhardt, 2025, pp. 184–197."},"place":"Heilbrunn","year":"2025","edition":"1","publication_identifier":{"isbn":["9783781527430"]},"publication_status":"published","title":"\"...da gerade hier die allgemeinen Theorieen uns nur zu oft im Stiche lassen.\" Rousseau in der Kritik gelehrter Frauen seiner Zeit ","author":[{"last_name":"Vochatzer","full_name":"Vochatzer, Stefanie","id":"95153","first_name":"Stefanie"},{"full_name":"Engelman , Sebastian ","last_name":"Engelman ","first_name":"Sebastian "}],"date_created":"2026-02-04T07:11:59Z","publisher":"Verlag Julius Klinkhardt","date_updated":"2026-02-09T10:33:51Z"},{"ddc":["000"],"language":[{"iso":"eng"}],"abstract":[{"text":"Abstract\r\n \r\n This study aimed to develop and evaluate deep learning approaches for the classification of quantum emission signals from WS\r\n 2\r\n monolayer nanobubbles across multiple spectral bands, addressing challenges in quantum materials characterization and spectral distinguishability assessment. We utilized a dataset of quantum emission signals ranging from 604 to 629 nm, emitted from WS₂ monolayer nanobubbles on gold substrates, categorized into four spectral bands (604.06–608.24 nm, 611.07–616.34 nm, 617.42–623.35 nm, and 624.16–636.57 nm). Our methodology involved signal preprocessing through normalization and moving average smoothing, followed by transformation into 128 × 128 RGB images using Continuous Wavelet Transform (CWT) with Complex Morlet wavelet. Three convolutional neural network architectures (ResNet50, VGG16, and Xception) were implemented and evaluated using fivefold cross-validation across six possible band pair combinations. All models demonstrated exceptional classification performance, with VGG16 achieving the highest overall mean accuracy of 99.4%, followed by Xception (99.1%) and ResNet50 (98.2%). Perfect classification accuracy (100%) was consistently achieved for spectrally distant band pairs, particularly Band 1 versus Band 4 (20.5 nm separation), while the most challenging classification involved adjacent bands (Band 2 vs. Band 3, 6.27 nm separation) with VGG16 achieving 96.5% accuracy. Statistical analysis using Friedman tests confirmed significant performance differences among models (χ\r\n 2\r\n = 8.67,\r\n p\r\n = 0.013). Xception demonstrated remarkable computational efficiency, achieving optimal convergence in as few as 2 epochs for certain band combinations while maintaining ultralow training loss values (8.23 × 10⁻\r\n 6\r\n ). Deep learning models, particularly when combined with CWT preprocessing, provide a robust framework for quantum emission signal classification with significant implications for quantum photonics, quantum cryptography, and quantum sensing applications. Our approach bridges the gap between classical machine learning and quantum materials characterization, establishing quantifiable metrics for evaluating spectral distinguishability in quantum information systems. The demonstrated ability to achieve high classification accuracy with minimal training through transfer learning addresses data scarcity challenges inherent to quantum systems, offering a promising direction for future quantum technology development.\r\n ","lang":"eng"}],"file":[{"date_updated":"2026-02-09T15:40:15Z","creator":"zraissi","date_created":"2026-02-09T15:40:15Z","file_size":8472739,"access_level":"closed","file_id":"64087","file_name":"s41598-025-29120-0.pdf","content_type":"application/pdf","success":1,"relation":"main_file"}],"publication":"Scientific Reports","title":"Deep learning for classifying quantum emission signals in WS2 monolayers using wavelet transform","publisher":"Springer Science and Business Media LLC","date_created":"2026-02-09T15:39:46Z","year":"2025","issue":"1","article_number":"41470","file_date_updated":"2026-02-09T15:40:15Z","_id":"64086","user_id":"98836","status":"public","type":"journal_article","doi":"10.1038/s41598-025-29120-0","date_updated":"2026-02-09T17:07:08Z","author":[{"first_name":"Hossein","last_name":"Najafzadeh","full_name":"Najafzadeh, Hossein"},{"first_name":"Zahra","last_name":"Raissi","full_name":"Raissi, Zahra"},{"last_name":"Golmohammady","full_name":"Golmohammady, Shole","first_name":"Shole"},{"last_name":"Kaji","full_name":"Kaji, Parivash Safari","first_name":"Parivash Safari"},{"first_name":"Mahdad","full_name":"Esmaeili, Mahdad","last_name":"Esmaeili"}],"volume":15,"citation":{"bibtex":"@article{Najafzadeh_Raissi_Golmohammady_Kaji_Esmaeili_2025, title={Deep learning for classifying quantum emission signals in WS2 monolayers using wavelet transform}, volume={15}, DOI={10.1038/s41598-025-29120-0}, number={141470}, journal={Scientific Reports}, publisher={Springer Science and Business Media LLC}, author={Najafzadeh, Hossein and Raissi, Zahra and Golmohammady, Shole and Kaji, Parivash Safari and Esmaeili, Mahdad}, year={2025} }","mla":"Najafzadeh, Hossein, et al. “Deep Learning for Classifying Quantum Emission Signals in WS2 Monolayers Using Wavelet Transform.” Scientific Reports, vol. 15, no. 1, 41470, Springer Science and Business Media LLC, 2025, doi:10.1038/s41598-025-29120-0.","short":"H. Najafzadeh, Z. Raissi, S. Golmohammady, P.S. Kaji, M. Esmaeili, Scientific Reports 15 (2025).","apa":"Najafzadeh, H., Raissi, Z., Golmohammady, S., Kaji, P. S., & Esmaeili, M. (2025). Deep learning for classifying quantum emission signals in WS2 monolayers using wavelet transform. Scientific Reports, 15(1), Article 41470. https://doi.org/10.1038/s41598-025-29120-0","ama":"Najafzadeh H, Raissi Z, Golmohammady S, Kaji PS, Esmaeili M. Deep learning for classifying quantum emission signals in WS2 monolayers using wavelet transform. Scientific Reports. 2025;15(1). doi:10.1038/s41598-025-29120-0","chicago":"Najafzadeh, Hossein, Zahra Raissi, Shole Golmohammady, Parivash Safari Kaji, and Mahdad Esmaeili. “Deep Learning for Classifying Quantum Emission Signals in WS2 Monolayers Using Wavelet Transform.” Scientific Reports 15, no. 1 (2025). https://doi.org/10.1038/s41598-025-29120-0.","ieee":"H. Najafzadeh, Z. Raissi, S. Golmohammady, P. S. Kaji, and M. Esmaeili, “Deep learning for classifying quantum emission signals in WS2 monolayers using wavelet transform,” Scientific Reports, vol. 15, no. 1, Art. no. 41470, 2025, doi: 10.1038/s41598-025-29120-0."},"intvolume":" 15","publication_status":"published","has_accepted_license":"1","publication_identifier":{"issn":["2045-2322"]}},{"main_file_link":[{"url":"https://www.hsozkult.de/publicationreview/id/reb-142262."}],"title":"Rezension zu: Wasmuth, Helge; Sauerbrey, Ulf; Winkler, Michael: Finding Froebel. The Man Who Invented Kindergarten. New York 2023 ","date_created":"2026-02-04T13:45:36Z","author":[{"first_name":"Stefanie","last_name":"Vochatzer","full_name":"Vochatzer, Stefanie","id":"95153"}],"date_updated":"2026-02-10T20:40:54Z","citation":{"chicago":"Vochatzer, Stefanie. “Rezension Zu: Wasmuth, Helge; Sauerbrey, Ulf; Winkler, Michael: Finding Froebel. The Man Who Invented Kindergarten. New York 2023 .” H-Soz-Kult, 2025.","ieee":"S. Vochatzer, “Rezension zu: Wasmuth, Helge; Sauerbrey, Ulf; Winkler, Michael: Finding Froebel. The Man Who Invented Kindergarten. New York 2023 ,” H-Soz-Kult. 2025.","ama":"Vochatzer S. Rezension zu: Wasmuth, Helge; Sauerbrey, Ulf; Winkler, Michael: Finding Froebel. The Man Who Invented Kindergarten. New York 2023 . H-Soz-Kult. Published online 2025.","apa":"Vochatzer, S. (2025). Rezension zu: Wasmuth, Helge; Sauerbrey, Ulf; Winkler, Michael: Finding Froebel. The Man Who Invented Kindergarten. New York 2023 . In H-Soz-Kult.","short":"S. Vochatzer, H-Soz-Kult (2025).","bibtex":"@article{Vochatzer_2025, title={Rezension zu: Wasmuth, Helge; Sauerbrey, Ulf; Winkler, Michael: Finding Froebel. The Man Who Invented Kindergarten. New York 2023 }, journal={H-Soz-Kult}, author={Vochatzer, Stefanie}, year={2025} }","mla":"Vochatzer, Stefanie. “Rezension Zu: Wasmuth, Helge; Sauerbrey, Ulf; Winkler, Michael: Finding Froebel. The Man Who Invented Kindergarten. New York 2023 .” H-Soz-Kult, 2025."},"year":"2025","publication_identifier":{"isbn":["9781350269248"]},"publication_status":"published","language":[{"iso":"eng"}],"department":[{"_id":"723"},{"_id":"724"},{"_id":"935"}],"user_id":"95153","_id":"63871","publication_date":"18.08.2025 ","status":"public","publication":"H-Soz-Kult","type":"review"},{"type":"book_editor","editor":[{"id":"20792","full_name":"Scheideler, Christian","last_name":"Scheideler","first_name":"Christian"},{"first_name":"Kitty","full_name":"Meeks, Kitty","last_name":"Meeks"}],"status":"public","_id":"64099","user_id":"15578","department":[{"_id":"34"},{"_id":"7"},{"_id":"79"}],"language":[{"iso":"eng"}],"publication_identifier":{"unknown":["ISBN 978-3-95977-368-3"]},"year":"2025","place":"SAND 2025, Liverpool, UK, June 9-11, 2025. LIPIcs 330, Schloss Dagstuhl - Leibniz-Zentrum für Informatik","citation":{"ama":"Scheideler C, Meeks K, eds. 4th Symposium on Algorithmic Foundations of Dynamic Networks.; 2025.","ieee":"C. Scheideler and K. Meeks, Eds., 4th Symposium on Algorithmic Foundations of Dynamic Networks. SAND 2025, Liverpool, UK, June 9-11, 2025. LIPIcs 330, Schloss Dagstuhl - Leibniz-Zentrum für Informatik, 2025.","chicago":"Scheideler, Christian, and Kitty Meeks, eds. 4th Symposium on Algorithmic Foundations of Dynamic Networks. SAND 2025, Liverpool, UK, June 9-11, 2025. LIPIcs 330, Schloss Dagstuhl - Leibniz-Zentrum für Informatik, 2025.","short":"C. Scheideler, K. Meeks, eds., 4th Symposium on Algorithmic Foundations of Dynamic Networks., SAND 2025, Liverpool, UK, June 9-11, 2025. LIPIcs 330, Schloss Dagstuhl - Leibniz-Zentrum für Informatik, 2025.","mla":"Scheideler, Christian, and Kitty Meeks, editors. 4th Symposium on Algorithmic Foundations of Dynamic Networks. 2025.","bibtex":"@book{Scheideler_Meeks_2025, place={SAND 2025, Liverpool, UK, June 9-11, 2025. LIPIcs 330, Schloss Dagstuhl - Leibniz-Zentrum für Informatik}, title={4th Symposium on Algorithmic Foundations of Dynamic Networks.}, year={2025} }","apa":"Scheideler, C., & Meeks, K. (Eds.). (2025). 4th Symposium on Algorithmic Foundations of Dynamic Networks."},"date_updated":"2026-02-11T09:11:09Z","date_created":"2026-02-10T09:49:03Z","title":"4th Symposium on Algorithmic Foundations of Dynamic Networks."},{"volume":36,"author":[{"first_name":"Lorenz","full_name":"Butzhammer, Lorenz","last_name":"Butzhammer"},{"full_name":"Handke, Niklas","last_name":"Handke","first_name":"Niklas"},{"first_name":"Simon","full_name":"Wittl, Simon","last_name":"Wittl"},{"first_name":"Gabriel","last_name":"Herl","full_name":"Herl, Gabriel"},{"first_name":"Tino","last_name":"Hausotte","full_name":"Hausotte, Tino"}],"oa":"1","date_updated":"2026-02-12T10:45:36Z","doi":"10.1088/1361-6501/ada05a","main_file_link":[{"open_access":"1","url":"https://iopscience.iop.org/article/10.1088/1361-6501/ada05a/pdf"}],"publication_identifier":{"issn":["0957-0233","1361-6501"]},"publication_status":"published","intvolume":" 36","citation":{"ama":"Butzhammer L, Handke N, Wittl S, Herl G, Hausotte T. Direct assessment of the influence of pose repeatability on the accuracy of dimensional measurements for computed tomography systems with high degrees of freedom. Measurement Science and Technology. 2025;36(2). doi:10.1088/1361-6501/ada05a","ieee":"L. Butzhammer, N. Handke, S. Wittl, G. Herl, and T. Hausotte, “Direct assessment of the influence of pose repeatability on the accuracy of dimensional measurements for computed tomography systems with high degrees of freedom,” Measurement Science and Technology, vol. 36, no. 2, Art. no. 025401, 2025, doi: 10.1088/1361-6501/ada05a.","chicago":"Butzhammer, Lorenz, Niklas Handke, Simon Wittl, Gabriel Herl, and Tino Hausotte. “Direct Assessment of the Influence of Pose Repeatability on the Accuracy of Dimensional Measurements for Computed Tomography Systems with High Degrees of Freedom.” Measurement Science and Technology 36, no. 2 (2025). https://doi.org/10.1088/1361-6501/ada05a.","bibtex":"@article{Butzhammer_Handke_Wittl_Herl_Hausotte_2025, title={Direct assessment of the influence of pose repeatability on the accuracy of dimensional measurements for computed tomography systems with high degrees of freedom}, volume={36}, DOI={10.1088/1361-6501/ada05a}, number={2025401}, journal={Measurement Science and Technology}, publisher={IOP Publishing}, author={Butzhammer, Lorenz and Handke, Niklas and Wittl, Simon and Herl, Gabriel and Hausotte, Tino}, year={2025} }","mla":"Butzhammer, Lorenz, et al. “Direct Assessment of the Influence of Pose Repeatability on the Accuracy of Dimensional Measurements for Computed Tomography Systems with High Degrees of Freedom.” Measurement Science and Technology, vol. 36, no. 2, 025401, IOP Publishing, 2025, doi:10.1088/1361-6501/ada05a.","short":"L. Butzhammer, N. Handke, S. Wittl, G. Herl, T. Hausotte, Measurement Science and Technology 36 (2025).","apa":"Butzhammer, L., Handke, N., Wittl, S., Herl, G., & Hausotte, T. (2025). Direct assessment of the influence of pose repeatability on the accuracy of dimensional measurements for computed tomography systems with high degrees of freedom. Measurement Science and Technology, 36(2), Article 025401. https://doi.org/10.1088/1361-6501/ada05a"},"department":[{"_id":"630"}],"user_id":"93720","_id":"61825","project":[{"_id":"130","name":"TRR 285: Methodenentwicklung zur mechanischen Fügbarkeit in wandlungsfähigen Prozessketten"},{"_id":"133","name":"TRR 285 - Project Area C"},{"name":"TRR 285 - Subproject C05","_id":"149"}],"article_number":"025401","type":"journal_article","status":"public","date_created":"2025-10-14T13:50:32Z","publisher":"IOP Publishing","title":"Direct assessment of the influence of pose repeatability on the accuracy of dimensional measurements for computed tomography systems with high degrees of freedom","issue":"2","quality_controlled":"1","year":"2025","language":[{"iso":"eng"}],"publication":"Measurement Science and Technology","abstract":[{"lang":"eng","text":"Abstract\r\n Industrial x-ray computed tomography (CT) systems with high geometric flexibility are increasingly utilized for large-scale measurement objects or challenging measurement tasks. To maintain high accuracy when deviating from the established circular scan trajectory, trajectory calibration methods using multi-sphere reference objects with known marker positions are commonly employed. These multi-sphere objects can either be scanned together with the measurement object (online trajectory calibration) or in a separate scan (offline trajectory calibration). While offline calibration increases machine time, it generally results in higher scan quality. However, a sufficient pose repeatability is necessary to ensure comparable or even superior accuracy to online calibration. In this contribution, we present a straightforward procedure to compare both types of trajectory calibration in a way that the differences of the results can directly be traced back to the influence of the pose repeatability. The multi-sphere reference object is not only used for trajectory calibration, but simultaneously as a measurement object for repeated measurements. The methodology is tested on both a twin robotic CT system and a conventional CT system that is additionally equipped with a hexapod manipulator for adaptive object tilting. Results showed, independent from the type of trajectory calibration, systematic measurement errors in the order of 10−5–10−4 of measured sphere distances and sphericity values below 50 \r\n \r\n \r\n \r\n \r\n μ\r\n \r\n \r\n m\r\n \r\n \r\n \r\n . For sphere distances, random errors were increased by a factor of 5 due to the offline trajectory calibration, but were still low (\r\n \r\n \r\n \r\n \r\n <\r\n \r\n \r\n 1\r\n \r\n \r\n \r\n μ\r\n \r\n \r\n m\r\n \r\n \r\n \r\n ) in comparison to systematic errors and the spread of different measurement features. Overall, both investigated systems demonstrated sufficient positioning repeatability for offline trajectory calibration. The method is in general also applicable to any other types of manipulator systems used for CT devices. It provides a workflow for the decision which type of trajectory calibration is preferable for a given CT system."}]},{"status":"public","abstract":[{"lang":"eng","text":"The thermal behavior of n-octanol and related ether alcohols has been studied by differential scanning calorimetry (DSC). The melting point, heat of fusion, and isobaric heat capacities of n-octanol obtained from the DSC measurements are in good agreement with literature values. The ether alcohols display kinetic barriers for forming a solid phase during cooldown. These barriers are least for 6-methoxyhexanol that forms a solid upon cooling except for the highest measured temperature change rate of 40 K·min–1, followed by 4-propoxybutanol that forms a solid during cooldown only at low cooling rates. 2-Pentoxyethanol and 5-ethoxypentanol form a solid during the heating cycle that then melts again upon further heating. 3-Butoxypropanol does not display any exo- and endothermic features for all measured temperature change rates. Consequently, new data on melting point and heats of fusion are reported for the ether alcohols except for 3-butoxypropanol. New isobaric heat capacities are presented as well for the liquid phase of these ether alcohols. The thermal behavior of n-octanol and related ether alcohols has been studied by differential scanning calorimetry (DSC). The melting point, heat of fusion, and isobaric heat capacities of n-octanol obtained from the DSC measurements are in good agreement with literature values. The ether alcohols display kinetic barriers for forming a solid phase during cooldown. These barriers are least for 6-methoxyhexanol that forms a solid upon cooling except for the highest measured temperature change rate of 40 K·min–1, followed by 4-propoxybutanol that forms a solid during cooldown only at low cooling rates. 2-Pentoxyethanol and 5-ethoxypentanol form a solid during the heating cycle that then melts again upon further heating. 3-Butoxypropanol does not display any exo- and endothermic features for all measured temperature change rates. Consequently, new data on melting point and heats of fusion are reported for the ether alcohols except for 3-butoxypropanol. New isobaric heat capacities are presented as well for the liquid phase of these ether alcohols."}],"publication":"Journal of Chemical & Engineering Data","type":"journal_article","extern":"1","language":[{"iso":"eng"}],"user_id":"100715","_id":"63981","intvolume":" 70","page":"600–606","citation":{"bibtex":"@article{Hoffmann_Gutmann_Buntkowsky_2025, title={Thermal Behavior of n-Octanol and Related Ether Alcohols}, volume={70}, DOI={10.1021/acs.jced.4c00525}, number={1}, journal={Journal of Chemical & Engineering Data}, publisher={American Chemical Society}, author={Hoffmann, Markus M. and Gutmann, Torsten and Buntkowsky, Gerd}, year={2025}, pages={600–606} }","short":"M.M. Hoffmann, T. Gutmann, G. Buntkowsky, Journal of Chemical & Engineering Data 70 (2025) 600–606.","mla":"Hoffmann, Markus M., et al. “Thermal Behavior of N-Octanol and Related Ether Alcohols.” Journal of Chemical & Engineering Data, vol. 70, no. 1, American Chemical Society, 2025, pp. 600–606, doi:10.1021/acs.jced.4c00525.","apa":"Hoffmann, M. M., Gutmann, T., & Buntkowsky, G. (2025). Thermal Behavior of n-Octanol and Related Ether Alcohols. Journal of Chemical & Engineering Data, 70(1), 600–606. https://doi.org/10.1021/acs.jced.4c00525","ama":"Hoffmann MM, Gutmann T, Buntkowsky G. Thermal Behavior of n-Octanol and Related Ether Alcohols. Journal of Chemical & Engineering Data. 2025;70(1):600–606. doi:10.1021/acs.jced.4c00525","ieee":"M. M. Hoffmann, T. Gutmann, and G. Buntkowsky, “Thermal Behavior of n-Octanol and Related Ether Alcohols,” Journal of Chemical & Engineering Data, vol. 70, no. 1, pp. 600–606, 2025, doi: 10.1021/acs.jced.4c00525.","chicago":"Hoffmann, Markus M., Torsten Gutmann, and Gerd Buntkowsky. “Thermal Behavior of N-Octanol and Related Ether Alcohols.” Journal of Chemical & Engineering Data 70, no. 1 (2025): 600–606. https://doi.org/10.1021/acs.jced.4c00525."},"year":"2025","issue":"1","publication_identifier":{"issn":["0021-9568"]},"doi":"10.1021/acs.jced.4c00525","title":"Thermal Behavior of n-Octanol and Related Ether Alcohols","volume":70,"author":[{"first_name":"Markus M.","full_name":"Hoffmann, Markus M.","last_name":"Hoffmann"},{"last_name":"Gutmann","id":"118165","full_name":"Gutmann, Torsten","first_name":"Torsten"},{"full_name":"Buntkowsky, Gerd","last_name":"Buntkowsky","first_name":"Gerd"}],"date_created":"2026-02-07T15:44:13Z","date_updated":"2026-02-17T16:16:57Z","publisher":"American Chemical Society"},{"user_id":"80877","_id":"64567","language":[{"iso":"ger"}],"type":"journal_article","publication":"Controlling & Management Review","status":"public","author":[{"last_name":"Ehmann","full_name":"Ehmann, Stefanie","first_name":"Stefanie"},{"full_name":"Kampkötter, Patrick","last_name":"Kampkötter","first_name":"Patrick"},{"first_name":"Patrick","last_name":"Maier","full_name":"Maier, Patrick"},{"id":"100432","full_name":"Yang, Philip","last_name":"Yang","first_name":"Philip"}],"date_created":"2026-02-20T14:33:35Z","volume":69,"publisher":"Springer Science and Business Media LLC","date_updated":"2026-02-20T14:35:17Z","doi":"10.1007/s12176-025-1506-4","title":"Wie Performance Management das Engagement steigern kann","issue":"5","publication_status":"published","publication_identifier":{"issn":["2195-8262","2195-8270"]},"citation":{"ieee":"S. Ehmann, P. Kampkötter, P. Maier, and P. Yang, “Wie Performance Management das Engagement steigern kann,” Controlling & Management Review, vol. 69, no. 5, pp. 40–45, 2025, doi: 10.1007/s12176-025-1506-4.","chicago":"Ehmann, Stefanie, Patrick Kampkötter, Patrick Maier, and Philip Yang. “Wie Performance Management das Engagement steigern kann.” Controlling & Management Review 69, no. 5 (2025): 40–45. https://doi.org/10.1007/s12176-025-1506-4.","ama":"Ehmann S, Kampkötter P, Maier P, Yang P. Wie Performance Management das Engagement steigern kann. Controlling & Management Review. 2025;69(5):40-45. doi:10.1007/s12176-025-1506-4","bibtex":"@article{Ehmann_Kampkötter_Maier_Yang_2025, title={Wie Performance Management das Engagement steigern kann}, volume={69}, DOI={10.1007/s12176-025-1506-4}, number={5}, journal={Controlling & Management Review}, publisher={Springer Science and Business Media LLC}, author={Ehmann, Stefanie and Kampkötter, Patrick and Maier, Patrick and Yang, Philip}, year={2025}, pages={40–45} }","short":"S. Ehmann, P. Kampkötter, P. Maier, P. Yang, Controlling & Management Review 69 (2025) 40–45.","mla":"Ehmann, Stefanie, et al. “Wie Performance Management das Engagement steigern kann.” Controlling & Management Review, vol. 69, no. 5, Springer Science and Business Media LLC, 2025, pp. 40–45, doi:10.1007/s12176-025-1506-4.","apa":"Ehmann, S., Kampkötter, P., Maier, P., & Yang, P. (2025). Wie Performance Management das Engagement steigern kann. Controlling & Management Review, 69(5), 40–45. https://doi.org/10.1007/s12176-025-1506-4"},"intvolume":" 69","page":"40-45","year":"2025"},{"language":[{"iso":"eng"}],"article_number":"131","article_type":"original","user_id":"114764","_id":"61767","project":[{"name":"TRR 285 - Project Area C","_id":"133"},{"_id":"130","name":"TRR 285: Methodenentwicklung zur mechanischen Fügbarkeit in wandlungsfähigen Prozessketten"},{"name":"TRR 285 - Subproject C04","_id":"148"}],"status":"public","abstract":[{"text":"Abstract\r\n A clinch point’s quality is usually assessed using ex situ destructive testing methods. These, however, are unable to detect phenomena immediately during the joining process. For instance, elastic deformations reverse and cracks close after unloading. In situ methods such as the force-displacement evaluation are used to investigate a clinching process, though deviations in the clinch point geometry cannot be derived with this method. To overcome these limitations, the clinching process can be investigated using in situ computed tomography (in situ CT). When investigating the clinching of aluminum parts in in situ CT, the sheet-sheet interface is hardly visible. Earlier investigations showed that radiopaque materials can be applied between the joining parts to enhance the detectability of the sheet-sheet interface. However, the layers cause strong artefacts, break during the clinching process or change the clinch joint’s properties significantly. In this paper, a minimally invasive method to enhance the interface detectability is presented. First, the aluminum oxide layer is removed by etching. Second, the specimen is electroplated with copper or gold, respectively. In some cases, a mask is applied to create a cross-shaped plating pattern. Then, the plated specimen is clinched with a non-plated counterpart and the interface detectability of the clinch points is assessed in CT scans. It is shown that a copper plating of 2.6–4 μm can visualize some parts of the interface, while 7–9 μm is suitable to enhance the detectability of the sheet-sheet interface almost continuously.","lang":"eng"}],"publication":"Journal of Nondestructive Evaluation","type":"journal_article","doi":"10.1007/s10921-025-01270-1","title":"In Situ CT of Clinch Points – Enhancing Interface Detectability Using Electroplated Patterns of Radiopaque Materials","volume":44,"author":[{"full_name":"Köhler, Daniel","id":"83408","last_name":"Köhler","first_name":"Daniel"},{"full_name":"Dargel, Alrik","id":"114764","last_name":"Dargel","first_name":"Alrik"},{"last_name":"Troschitz","full_name":"Troschitz, Juliane","first_name":"Juliane"},{"full_name":"Gude, Maik","last_name":"Gude","first_name":"Maik"},{"first_name":"Robert","last_name":"Kupfer","full_name":"Kupfer, Robert"}],"date_created":"2025-10-09T08:27:41Z","publisher":"Springer Science and Business Media LLC","date_updated":"2026-02-24T15:13:52Z","intvolume":" 44","citation":{"ama":"Köhler D, Dargel A, Troschitz J, Gude M, Kupfer R. In Situ CT of Clinch Points – Enhancing Interface Detectability Using Electroplated Patterns of Radiopaque Materials. Journal of Nondestructive Evaluation. 2025;44(4). doi:10.1007/s10921-025-01270-1","chicago":"Köhler, Daniel, Alrik Dargel, Juliane Troschitz, Maik Gude, and Robert Kupfer. “In Situ CT of Clinch Points – Enhancing Interface Detectability Using Electroplated Patterns of Radiopaque Materials.” Journal of Nondestructive Evaluation 44, no. 4 (2025). https://doi.org/10.1007/s10921-025-01270-1.","ieee":"D. Köhler, A. Dargel, J. Troschitz, M. Gude, and R. Kupfer, “In Situ CT of Clinch Points – Enhancing Interface Detectability Using Electroplated Patterns of Radiopaque Materials,” Journal of Nondestructive Evaluation, vol. 44, no. 4, Art. no. 131, 2025, doi: 10.1007/s10921-025-01270-1.","bibtex":"@article{Köhler_Dargel_Troschitz_Gude_Kupfer_2025, title={In Situ CT of Clinch Points – Enhancing Interface Detectability Using Electroplated Patterns of Radiopaque Materials}, volume={44}, DOI={10.1007/s10921-025-01270-1}, number={4131}, journal={Journal of Nondestructive Evaluation}, publisher={Springer Science and Business Media LLC}, author={Köhler, Daniel and Dargel, Alrik and Troschitz, Juliane and Gude, Maik and Kupfer, Robert}, year={2025} }","mla":"Köhler, Daniel, et al. “In Situ CT of Clinch Points – Enhancing Interface Detectability Using Electroplated Patterns of Radiopaque Materials.” Journal of Nondestructive Evaluation, vol. 44, no. 4, 131, Springer Science and Business Media LLC, 2025, doi:10.1007/s10921-025-01270-1.","short":"D. Köhler, A. Dargel, J. Troschitz, M. Gude, R. Kupfer, Journal of Nondestructive Evaluation 44 (2025).","apa":"Köhler, D., Dargel, A., Troschitz, J., Gude, M., & Kupfer, R. (2025). In Situ CT of Clinch Points – Enhancing Interface Detectability Using Electroplated Patterns of Radiopaque Materials. Journal of Nondestructive Evaluation, 44(4), Article 131. https://doi.org/10.1007/s10921-025-01270-1"},"year":"2025","issue":"4","publication_identifier":{"issn":["0195-9298","1573-4862"]},"publication_status":"published"},{"keyword":["Finite Element Method (FEM)","Process","Thermoplastic Fiber Reinforced Plastic"],"language":[{"iso":"eng"}],"publication":"Sheet Metal 2025","abstract":[{"lang":"eng","text":"This paper investigates two modeling approaches for the simulation of the deformation and decomposition behavior of preconsolidated rovings above the thermoplastic matrix{\\textquoteright} melting temperature. This is crucial for capturing the local material structure after processes introducing highly localized deformation such as mechanical joining processes between metal and fiber reinforced thermoplastics (FRTP). A generic finite element (FE) model is developed, incorporating interfaces discretized through either cohesive zone (CZ) elements or Coulomb friction-based contacts. The material parameters for the FE elements are derived from the initial stiffness of a statistical volume element (SVE) at micro scale modelled with an Arbitrary-Lagrange-Eulerian method for three load cases. The CZ properties calculated are based on the shear viscosity of the composite. The CZ and contact modelling approaches are evaluated using three load cases of the SVE, comparing force-displacement curves. Under simple loading conditions, such as normal pressure tension and bending, both methods produce similar results; however, in complex load cases, the CZ approach shows clear advantages in handling interface interactions and shows robust simulations. The CZ approach thus presents a promising method for simulating roving decomposition in FRTP-metal joining applications above the matrix{\\textquoteright} melting temperature."}],"publisher":"Materials Research Forum LLC, Materials Research Foundations","date_created":"2025-11-04T12:48:21Z","title":"Modeling approaches for the decomposition behavior of preconsolidated rovings throughout local deformation processes","year":"2025","project":[{"name":"TRR 285: Methodenentwicklung zur mechanischen Fügbarkeit in wandlungsfähigen Prozessketten","_id":"130"},{"_id":"137","name":"TRR 285 - Subproject A03"},{"_id":"131","name":"TRR 285 - Project Area A"}],"_id":"62079","series_title":"Materials Research Proceedings","user_id":"105344","type":"conference","editor":[{"last_name":"Meschut","full_name":"Meschut, G.","first_name":"G."},{"last_name":"Bobbert","full_name":"Bobbert, M.","first_name":"M."},{"first_name":"J.","full_name":"Duflou, J.","last_name":"Duflou"},{"first_name":"L.","last_name":"Fratini","full_name":"Fratini, L."},{"full_name":"Hagenah, H.","last_name":"Hagenah","first_name":"H."},{"last_name":"Martins","full_name":"Martins, P.","first_name":"P."},{"last_name":"Merklein","full_name":"Merklein, M.","first_name":"M."},{"first_name":"F.","last_name":"Micari","full_name":"Micari, F."}],"status":"public","date_updated":"2026-02-27T06:43:19Z","author":[{"first_name":"Benjamin","full_name":"Gröger, Benjamin","last_name":"Gröger"},{"first_name":"Johannes","orcid":"0000-0002-0169-8602","last_name":"Gerritzen","id":"105344","full_name":"Gerritzen, Johannes"},{"first_name":"Andreas","full_name":"Hornig, Andreas","last_name":"Hornig"},{"first_name":"Maik","last_name":"Gude","full_name":"Gude, Maik"}],"doi":"10.21741/9781644903551-33","publication_identifier":{"isbn":["978-1-64490-354-4"]},"citation":{"chicago":"Gröger, Benjamin, Johannes Gerritzen, Andreas Hornig, and Maik Gude. “Modeling Approaches for the Decomposition Behavior of Preconsolidated Rovings throughout Local Deformation Processes.” In Sheet Metal 2025, edited by G. Meschut, M. Bobbert, J. Duflou, L. Fratini, H. Hagenah, P. Martins, M. Merklein, and F. Micari, 268–275. Materials Research Proceedings. Materials Research Forum LLC, Materials Research Foundations, 2025. https://doi.org/10.21741/9781644903551-33.","ieee":"B. Gröger, J. Gerritzen, A. Hornig, and M. Gude, “Modeling approaches for the decomposition behavior of preconsolidated rovings throughout local deformation processes,” in Sheet Metal 2025, 2025, pp. 268–275, doi: 10.21741/9781644903551-33.","ama":"Gröger B, Gerritzen J, Hornig A, Gude M. Modeling approaches for the decomposition behavior of preconsolidated rovings throughout local deformation processes. In: Meschut G, Bobbert M, Duflou J, et al., eds. Sheet Metal 2025. Materials Research Proceedings. Materials Research Forum LLC, Materials Research Foundations; 2025:268–275. doi:10.21741/9781644903551-33","apa":"Gröger, B., Gerritzen, J., Hornig, A., & Gude, M. (2025). Modeling approaches for the decomposition behavior of preconsolidated rovings throughout local deformation processes. In G. Meschut, M. Bobbert, J. Duflou, L. Fratini, H. Hagenah, P. Martins, M. Merklein, & F. Micari (Eds.), Sheet Metal 2025 (pp. 268–275). Materials Research Forum LLC, Materials Research Foundations. https://doi.org/10.21741/9781644903551-33","bibtex":"@inproceedings{Gröger_Gerritzen_Hornig_Gude_2025, series={Materials Research Proceedings}, title={Modeling approaches for the decomposition behavior of preconsolidated rovings throughout local deformation processes}, DOI={10.21741/9781644903551-33}, booktitle={Sheet Metal 2025}, publisher={Materials Research Forum LLC, Materials Research Foundations}, author={Gröger, Benjamin and Gerritzen, Johannes and Hornig, Andreas and Gude, Maik}, editor={Meschut, G. and Bobbert, M. and Duflou, J. and Fratini, L. and Hagenah, H. and Martins, P. and Merklein, M. and Micari, F.}, year={2025}, pages={268–275}, collection={Materials Research Proceedings} }","mla":"Gröger, Benjamin, et al. “Modeling Approaches for the Decomposition Behavior of Preconsolidated Rovings throughout Local Deformation Processes.” Sheet Metal 2025, edited by G. Meschut et al., Materials Research Forum LLC, Materials Research Foundations, 2025, pp. 268–275, doi:10.21741/9781644903551-33.","short":"B. Gröger, J. Gerritzen, A. Hornig, M. Gude, in: G. Meschut, M. Bobbert, J. Duflou, L. Fratini, H. Hagenah, P. Martins, M. Merklein, F. Micari (Eds.), Sheet Metal 2025, Materials Research Forum LLC, Materials Research Foundations, 2025, pp. 268–275."},"page":"268–275"},{"_id":"62080","project":[{"_id":"130","name":"TRR 285: Methodenentwicklung zur mechanischen Fügbarkeit in wandlungsfähigen Prozessketten"},{"name":"TRR 285 - Subproject A03","_id":"137"},{"name":"TRR 285 - Project Area A","_id":"131"}],"series_title":"Materials Research Proceedings","user_id":"105344","keyword":["Failure","Fiber Reinforced Plastic","Machine Learning"],"language":[{"iso":"eng"}],"publication":"Sheet Metal 2025","type":"conference","abstract":[{"text":"The failure behavior of fiber reinforced polymers (FRP) is strongly influenced by their microstructure, i.e. fiber arrangement or local fiber volume content. However, this information cannot be directly used for structural analyses, since it requires a discretization on micrometer level. Therefore, current failure theories do not directly account for such effects, but describe the behavior averaged over an entire specimen. This foundation in experimentally accessible loading conditions leads to purely theory based extension to more complex stress states without direct validation possibilities. This work aims at leveraging micro-scale simulations to obtain failure information under arbitrary loading conditions. The results are propagated to the meso-scale, enabling efficient structural analyses, by means of machine learning (ML). It is shown that the ML model is capable of correctly assessing previously unseen stress states and therefore poses an efficient tool of exploiting information from the micro-scale in larger simulations.","lang":"eng"}],"editor":[{"full_name":"Meschut, G.","last_name":"Meschut","first_name":"G."},{"full_name":"Bobbert, M.","last_name":"Bobbert","first_name":"M."},{"full_name":"Duflou, J.","last_name":"Duflou","first_name":"J."},{"last_name":"Fratini","full_name":"Fratini, L.","first_name":"L."},{"first_name":"H.","last_name":"Hagenah","full_name":"Hagenah, H."},{"first_name":"P.","full_name":"Martins, P.","last_name":"Martins"},{"first_name":"M.","full_name":"Merklein, M.","last_name":"Merklein"},{"full_name":"Micari, F.","last_name":"Micari","first_name":"F."}],"status":"public","date_updated":"2026-02-27T06:43:37Z","publisher":"Materials Research Forum LLC, Materials Research Foundations","author":[{"full_name":"Gerritzen, Johannes","id":"105344","orcid":"0000-0002-0169-8602","last_name":"Gerritzen","first_name":"Johannes"},{"first_name":"Andreas","last_name":"Hornig","full_name":"Hornig, Andreas"},{"full_name":"Gude, Maik","last_name":"Gude","first_name":"Maik"}],"date_created":"2025-11-04T12:48:37Z","title":"Efficient failure information propagation under complex stress states in fiber reinforced polymers: From micro- to meso-scale using machine learning","doi":"10.21741/9781644903551-32","publication_identifier":{"isbn":["978-1-64490-354-4"]},"year":"2025","page":"260–267","citation":{"chicago":"Gerritzen, Johannes, Andreas Hornig, and Maik Gude. “Efficient Failure Information Propagation under Complex Stress States in Fiber Reinforced Polymers: From Micro- to Meso-Scale Using Machine Learning.” In Sheet Metal 2025, edited by G. Meschut, M. Bobbert, J. Duflou, L. Fratini, H. Hagenah, P. Martins, M. Merklein, and F. Micari, 260–267. Materials Research Proceedings. Materials Research Forum LLC, Materials Research Foundations, 2025. https://doi.org/10.21741/9781644903551-32.","ieee":"J. Gerritzen, A. Hornig, and M. Gude, “Efficient failure information propagation under complex stress states in fiber reinforced polymers: From micro- to meso-scale using machine learning,” in Sheet Metal 2025, 2025, pp. 260–267, doi: 10.21741/9781644903551-32.","ama":"Gerritzen J, Hornig A, Gude M. Efficient failure information propagation under complex stress states in fiber reinforced polymers: From micro- to meso-scale using machine learning. In: Meschut G, Bobbert M, Duflou J, et al., eds. Sheet Metal 2025. Materials Research Proceedings. Materials Research Forum LLC, Materials Research Foundations; 2025:260–267. doi:10.21741/9781644903551-32","apa":"Gerritzen, J., Hornig, A., & Gude, M. (2025). Efficient failure information propagation under complex stress states in fiber reinforced polymers: From micro- to meso-scale using machine learning. In G. Meschut, M. Bobbert, J. Duflou, L. Fratini, H. Hagenah, P. Martins, M. Merklein, & F. Micari (Eds.), Sheet Metal 2025 (pp. 260–267). Materials Research Forum LLC, Materials Research Foundations. https://doi.org/10.21741/9781644903551-32","bibtex":"@inproceedings{Gerritzen_Hornig_Gude_2025, series={Materials Research Proceedings}, title={Efficient failure information propagation under complex stress states in fiber reinforced polymers: From micro- to meso-scale using machine learning}, DOI={10.21741/9781644903551-32}, booktitle={Sheet Metal 2025}, publisher={Materials Research Forum LLC, Materials Research Foundations}, author={Gerritzen, Johannes and Hornig, Andreas and Gude, Maik}, editor={Meschut, G. and Bobbert, M. and Duflou, J. and Fratini, L. and Hagenah, H. and Martins, P. and Merklein, M. and Micari, F.}, year={2025}, pages={260–267}, collection={Materials Research Proceedings} }","mla":"Gerritzen, Johannes, et al. “Efficient Failure Information Propagation under Complex Stress States in Fiber Reinforced Polymers: From Micro- to Meso-Scale Using Machine Learning.” Sheet Metal 2025, edited by G. Meschut et al., Materials Research Forum LLC, Materials Research Foundations, 2025, pp. 260–267, doi:10.21741/9781644903551-32.","short":"J. Gerritzen, A. Hornig, M. Gude, in: G. Meschut, M. Bobbert, J. Duflou, L. Fratini, H. Hagenah, P. Martins, M. Merklein, F. Micari (Eds.), Sheet Metal 2025, Materials Research Forum LLC, Materials Research Foundations, 2025, pp. 260–267."}},{"language":[{"iso":"eng"}],"file_date_updated":"2026-03-02T11:00:37Z","keyword":["lead free piezoelectric ceramics","bolted Langevin transducer","medium power ultrasound."],"ddc":["620"],"department":[{"_id":"151"}],"user_id":"210","_id":"64798","status":"public","file":[{"date_updated":"2026-03-02T11:00:37Z","creator":"hemsel","date_created":"2026-03-02T10:37:46Z","file_size":1812289,"file_id":"64799","file_name":"IWPMA_2025_Hemsel.pdf","access_level":"open_access","content_type":"application/pdf","relation":"main_file"}],"abstract":[{"lang":"eng","text":"Lead-containing piezoelectric ceramics are still the base for today’s ultrasonic transducers used in broad applications. This is partly due to missing powerful lead-free piezoelectric ceramic parts in the commercial market. There has been much research on lead-free materials but developing them into marketable parts seems to be an ongoing process. The actual exemption of ROHS has expired, but as the new exemption has already been requested, ceramic suppliers keep on selling lead containing products. Nevertheless, these should be replaced by lead-free alternatives for environmental and health issues. \r\nThis contribution focuses on exploring the technological readiness level of lead-free hard piezoceramics for prestressed ultrasonic transducers. A small series of bolted Langevin transducers was set up with standard PZT material and three commercial lead-free variants. Results of the building process from individual ring ceramic characteristics to transducer load tests are presented. The main finding of this study is that the lead-free materials technically can compete with the standard PZT for medium-power applications. Some adaptations in the ultrasonic system must be done: the geometry must be altered to fit resonance frequency, and higher voltages or thinner ceramics are needed to achieve the same vibration level at low load. For reaching same power, the volume of lead-free ceramics must be 1.5 to 3 times larger. As already promoted in literature, mechanical losses at high vibration levels are smaller for the lead-free materials. This might help to argument lead-free piezoelectric materials in some applications.\r\n\r\nReferences\r\n1.\tDirective 2011/65/EU of the European Parliament and of the Council of 8 June 2011 on the Restriction of the Use of Certain Hazardous Substances in Electrical and Electronic Equipment. EUR-Lex Document 02011L0065-20240801. Available online: http://data.europa.eu/eli/dir/2011/65/2024-08-01 (accessed on 24 January 2025).\r\n2.\tLangevin, P. (1918) Method and Apparatus for Transmitting and Receiving Submarine Elastic Waves Using the Piezoelectric Properties of Quartz. French Patent Office; Patent No. FR505703.\r\n3.\tHemsel, T.; Twiefel, J. (2023) Piezoelectric Ultrasonic Power Transducers. In Encyclopedia of Materials: Electronics; Academic Press: Oxford, UK; pp. 276–285. https://doi.org/10.1016/b978-0-12-819728-8.00047-4.\r\n4.\tATHENA Technologie Beratung GmbH (2025) Description of Ultrasound Generator. Available online: http://shop.myathena.de/epages/12074748.sf/de_DE/?ObjectPath=/Shops/12074748/Products/AM200 (accessed on 13 January 2025).\r\n5.\tLittmann, W.; Hemsel, T.; Kauczor, C.; Wallaschek, J.; Sinha, W. (2003) Load-adaptive phase-controller for resonant driven piezoelectric devices. Proc. World Congr. Ultrason. 2003, 48, 547–550.\r\n6.\tScheidemann, C., Bornmann, P., Littmann, W., & Hemsel, T. (2025). Lead-Free Ceramics in Prestressed Ultrasonic Transducers. Actuators, 14(2), 55. https://doi.org/10.3390/act14020055\r\n"}],"type":"conference","conference":{"name":"International Workshop on Piezoelectric Materials and Applications in Actuators (IWPMA)","start_date":"2025-07-01","end_date":"2025-07-03","location":"Vilnius, Lithuania"},"title":"Bolted Langevin transducers with leadfree piezoelectric ceramics","date_created":"2026-03-02T10:39:40Z","author":[{"full_name":"Scheidemann, Claus","id":"38259","last_name":"Scheidemann","first_name":"Claus"},{"first_name":"Peter","last_name":"Bornmann","full_name":"Bornmann, Peter"},{"last_name":"Littmann","full_name":"Littmann, Walter","first_name":"Walter"},{"first_name":"Tobias","full_name":"Hemsel, Tobias","id":"210","last_name":"Hemsel"}],"oa":"1","date_updated":"2026-03-02T11:04:56Z","citation":{"chicago":"Scheidemann, Claus, Peter Bornmann, Walter Littmann, and Tobias Hemsel. “Bolted Langevin Transducers with Leadfree Piezoelectric Ceramics,” 2025.","ieee":"C. Scheidemann, P. Bornmann, W. Littmann, and T. Hemsel, “Bolted Langevin transducers with leadfree piezoelectric ceramics,” presented at the International Workshop on Piezoelectric Materials and Applications in Actuators (IWPMA), Vilnius, Lithuania, 2025.","ama":"Scheidemann C, Bornmann P, Littmann W, Hemsel T. Bolted Langevin transducers with leadfree piezoelectric ceramics. In: ; 2025.","apa":"Scheidemann, C., Bornmann, P., Littmann, W., & Hemsel, T. (2025). Bolted Langevin transducers with leadfree piezoelectric ceramics. International Workshop on Piezoelectric Materials and Applications in Actuators (IWPMA), Vilnius, Lithuania.","bibtex":"@inproceedings{Scheidemann_Bornmann_Littmann_Hemsel_2025, title={Bolted Langevin transducers with leadfree piezoelectric ceramics}, author={Scheidemann, Claus and Bornmann, Peter and Littmann, Walter and Hemsel, Tobias}, year={2025} }","mla":"Scheidemann, Claus, et al. Bolted Langevin Transducers with Leadfree Piezoelectric Ceramics. 2025.","short":"C. Scheidemann, P. Bornmann, W. Littmann, T. Hemsel, in: 2025."},"year":"2025","has_accepted_license":"1"},{"publication":"Education Sciences","abstract":[{"text":"(1) Background: As digitalisation transforms society, digital competences are increasingly essential. Yet students’ digital competences often vary significantly, largely influenced by socio-economic background. Some schools—termed “resilient schools”—effectively counter these disadvantages and foster high digital competence. This study investigates the prevalence of such schools and examines how they differ from others. (2) Methods: Drawing on representative ICILS 2023 data, quantitative secondary analyses—including descriptive statistics, t-tests, and multiple regression—were conducted. Following the identification of resilient schools, in-depth analyses focus on those countries with substantial proportions of resilient schools above 10 percent (Austria, Italy, and Portugal), as these countries seem to have effective strategies to foster school resilience. (3) Results: The findings highlight considerable cross-national variation, indicating that school resilience is context-dependent. Resilient schools consistently emphasise student learning-related factors—such as ICT-related attitudes and educational aspirations—while the influence of home environments is less pronounced than in other schools. (4) Conclusions: Strengthening student learning-related factors appears to be crucial for building digital resilience. These insights can inform policy and practice aimed at fostering educational equity and closing the digital divide, particularly in socio-economically disadvantaged contexts.","lang":"eng"}],"language":[{"iso":"eng"}],"issue":"7","year":"2025","publisher":"MDPI AG","date_created":"2026-03-04T09:38:17Z","title":"Overcoming Digital Inequalities—Identification and Characterisation of Digitally Resilient Schools in Different Countries Using ICILS 2023 Data","type":"journal_article","status":"public","_id":"64824","department":[{"_id":"462"}],"user_id":"40387","article_number":"898","publication_identifier":{"issn":["2227-7102"]},"publication_status":"published","intvolume":" 15","citation":{"chicago":"Niemann, Jan, Birgit Eickelmann, and Kerstin Drossel. “Overcoming Digital Inequalities—Identification and Characterisation of Digitally Resilient Schools in Different Countries Using ICILS 2023 Data.” Education Sciences 15, no. 7 (2025). https://doi.org/10.3390/educsci15070898.","ieee":"J. Niemann, B. Eickelmann, and K. Drossel, “Overcoming Digital Inequalities—Identification and Characterisation of Digitally Resilient Schools in Different Countries Using ICILS 2023 Data,” Education Sciences, vol. 15, no. 7, Art. no. 898, 2025, doi: 10.3390/educsci15070898.","ama":"Niemann J, Eickelmann B, Drossel K. Overcoming Digital Inequalities—Identification and Characterisation of Digitally Resilient Schools in Different Countries Using ICILS 2023 Data. Education Sciences. 2025;15(7). doi:10.3390/educsci15070898","bibtex":"@article{Niemann_Eickelmann_Drossel_2025, title={Overcoming Digital Inequalities—Identification and Characterisation of Digitally Resilient Schools in Different Countries Using ICILS 2023 Data}, volume={15}, DOI={10.3390/educsci15070898}, number={7898}, journal={Education Sciences}, publisher={MDPI AG}, author={Niemann, Jan and Eickelmann, Birgit and Drossel, Kerstin}, year={2025} }","mla":"Niemann, Jan, et al. “Overcoming Digital Inequalities—Identification and Characterisation of Digitally Resilient Schools in Different Countries Using ICILS 2023 Data.” Education Sciences, vol. 15, no. 7, 898, MDPI AG, 2025, doi:10.3390/educsci15070898.","short":"J. Niemann, B. Eickelmann, K. Drossel, Education Sciences 15 (2025).","apa":"Niemann, J., Eickelmann, B., & Drossel, K. (2025). Overcoming Digital Inequalities—Identification and Characterisation of Digitally Resilient Schools in Different Countries Using ICILS 2023 Data. Education Sciences, 15(7), Article 898. https://doi.org/10.3390/educsci15070898"},"date_updated":"2026-03-04T09:41:33Z","volume":15,"author":[{"last_name":"Niemann","full_name":"Niemann, Jan","first_name":"Jan"},{"full_name":"Eickelmann, Birgit","last_name":"Eickelmann","first_name":"Birgit"},{"first_name":"Kerstin","full_name":"Drossel, Kerstin","last_name":"Drossel"}],"doi":"10.3390/educsci15070898"},{"date_created":"2024-10-06T20:20:34Z","author":[{"first_name":"Margarita","orcid":"0000-0001-5521-0417","last_name":"Knickenberg","id":"12978","full_name":"Knickenberg, Margarita"},{"last_name":"Hoya","full_name":"Hoya, Fabian","first_name":"Fabian"},{"first_name":"Frank","last_name":"Hellmich","id":"26282","full_name":"Hellmich, Frank"}],"publisher":"Universität Mannheim","date_updated":"2024-12-18T10:27:57Z","title":"Wahrnehmung und Effekte elterlichen Feedbacks auf die Lesemotivation und -leistung von Grundschulkindern. Vortrag im Rahmen des Symposiums „Lernen durch Feedback von Lehrpersonen, Eltern und Schüler:innen“ (Sebastian Röhl & Fabian Hoya) auf der 12. Tagung der Gesellschaft für Empirische Bildungsforschung (GEBF). Thema: „Bildung als Schlüssel für gesellschaftliche Herausforderungen: Interdisziplinäre Beiträge aus der Bildungsforschung“","citation":{"ieee":"M. Knickenberg, F. Hoya, and F. Hellmich, “Wahrnehmung und Effekte elterlichen Feedbacks auf die Lesemotivation und -leistung von Grundschulkindern. Vortrag im Rahmen des Symposiums „Lernen durch Feedback von Lehrpersonen, Eltern und Schüler:innen“ (Sebastian Röhl & Fabian Hoya) auf der 12. Tagung der Gesellschaft für Empirische Bildungsforschung (GEBF). Thema: „Bildung als Schlüssel für gesellschaftliche Herausforderungen: Interdisziplinäre Beiträge aus der Bildungsforschung“,” 2025.","chicago":"Knickenberg, Margarita, Fabian Hoya, and Frank Hellmich. “Wahrnehmung Und Effekte Elterlichen Feedbacks Auf Die Lesemotivation Und -Leistung von Grundschulkindern. Vortrag Im Rahmen Des Symposiums „Lernen Durch Feedback von Lehrpersonen, Eltern Und Schüler:Innen“ (Sebastian Röhl & Fabian Hoya) Auf Der 12. Tagung Der Gesellschaft Für Empirische Bildungsforschung (GEBF). Thema: „Bildung Als Schlüssel Für Gesellschaftliche Herausforderungen: Interdisziplinäre Beiträge Aus Der Bildungsforschung“.” Mannheim: Universität Mannheim, 2025.","ama":"Knickenberg M, Hoya F, Hellmich F. Wahrnehmung und Effekte elterlichen Feedbacks auf die Lesemotivation und -leistung von Grundschulkindern. Vortrag im Rahmen des Symposiums „Lernen durch Feedback von Lehrpersonen, Eltern und Schüler:innen“ (Sebastian Röhl & Fabian Hoya) auf der 12. Tagung der Gesellschaft für Empirische Bildungsforschung (GEBF). Thema: „Bildung als Schlüssel für gesellschaftliche Herausforderungen: Interdisziplinäre Beiträge aus der Bildungsforschung“. In: Universität Mannheim; 2025.","bibtex":"@inproceedings{Knickenberg_Hoya_Hellmich_2025, place={Mannheim}, title={Wahrnehmung und Effekte elterlichen Feedbacks auf die Lesemotivation und -leistung von Grundschulkindern. Vortrag im Rahmen des Symposiums „Lernen durch Feedback von Lehrpersonen, Eltern und Schüler:innen“ (Sebastian Röhl & Fabian Hoya) auf der 12. Tagung der Gesellschaft für Empirische Bildungsforschung (GEBF). Thema: „Bildung als Schlüssel für gesellschaftliche Herausforderungen: Interdisziplinäre Beiträge aus der Bildungsforschung“}, publisher={Universität Mannheim}, author={Knickenberg, Margarita and Hoya, Fabian and Hellmich, Frank}, year={2025} }","short":"M. Knickenberg, F. Hoya, F. Hellmich, in: Universität Mannheim, Mannheim, 2025.","mla":"Knickenberg, Margarita, et al. Wahrnehmung Und Effekte Elterlichen Feedbacks Auf Die Lesemotivation Und -Leistung von Grundschulkindern. Vortrag Im Rahmen Des Symposiums „Lernen Durch Feedback von Lehrpersonen, Eltern Und Schüler:Innen“ (Sebastian Röhl & Fabian Hoya) Auf Der 12. Tagung Der Gesellschaft Für Empirische Bildungsforschung (GEBF). Thema: „Bildung Als Schlüssel Für Gesellschaftliche Herausforderungen: Interdisziplinäre Beiträge Aus Der Bildungsforschung“. Universität Mannheim, 2025.","apa":"Knickenberg, M., Hoya, F., & Hellmich, F. (2025). Wahrnehmung und Effekte elterlichen Feedbacks auf die Lesemotivation und -leistung von Grundschulkindern. Vortrag im Rahmen des Symposiums „Lernen durch Feedback von Lehrpersonen, Eltern und Schüler:innen“ (Sebastian Röhl & Fabian Hoya) auf der 12. Tagung der Gesellschaft für Empirische Bildungsforschung (GEBF). Thema: „Bildung als Schlüssel für gesellschaftliche Herausforderungen: Interdisziplinäre Beiträge aus der Bildungsforschung“."},"place":"Mannheim","year":"2025","user_id":"57672","department":[{"_id":"460"}],"_id":"56337","language":[{"iso":"eng"}],"type":"conference_abstract","status":"public"}]