[{"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","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":[{"access_level":"closed","file_id":"64087","file_name":"s41598-025-29120-0.pdf","file_size":8472739,"creator":"zraissi","date_created":"2026-02-09T15:40:15Z","date_updated":"2026-02-09T15:40:15Z","relation":"main_file","success":1,"content_type":"application/pdf"}],"publication":"Scientific Reports","doi":"10.1038/s41598-025-29120-0","date_updated":"2026-02-09T17:07:08Z","volume":15,"author":[{"full_name":"Najafzadeh, Hossein","last_name":"Najafzadeh","first_name":"Hossein"},{"first_name":"Zahra","full_name":"Raissi, Zahra","last_name":"Raissi"},{"first_name":"Shole","full_name":"Golmohammady, Shole","last_name":"Golmohammady"},{"last_name":"Kaji","full_name":"Kaji, Parivash Safari","first_name":"Parivash Safari"},{"last_name":"Esmaeili","full_name":"Esmaeili, Mahdad","first_name":"Mahdad"}],"intvolume":" 15","citation":{"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.","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} }","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","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.","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"},"has_accepted_license":"1","publication_identifier":{"issn":["2045-2322"]},"publication_status":"published","article_number":"41470","file_date_updated":"2026-02-09T15:40:15Z","_id":"64086","user_id":"98836","status":"public","type":"journal_article"},{"type":"book_editor","editor":[{"first_name":"Christian","last_name":"Scheideler","id":"20792","full_name":"Scheideler, Christian"},{"first_name":"Kitty","last_name":"Meeks","full_name":"Meeks, Kitty"}],"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"]},"place":"SAND 2025, Liverpool, UK, June 9-11, 2025. LIPIcs 330, Schloss Dagstuhl - Leibniz-Zentrum für Informatik","year":"2025","citation":{"mla":"Scheideler, Christian, and Kitty Meeks, editors. 4th Symposium on Algorithmic Foundations of Dynamic Networks. 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.","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.","ama":"Scheideler C, Meeks K, eds. 4th Symposium on Algorithmic Foundations of Dynamic Networks.; 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.","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."},"date_updated":"2026-02-11T09:11:09Z","date_created":"2026-02-10T09:49:03Z","title":"4th Symposium on Algorithmic Foundations of Dynamic Networks."},{"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."}],"publication":"Measurement Science and Technology","language":[{"iso":"eng"}],"year":"2025","quality_controlled":"1","issue":"2","title":"Direct assessment of the influence of pose repeatability on the accuracy of dimensional measurements for computed tomography systems with high degrees of freedom","publisher":"IOP Publishing","date_created":"2025-10-14T13:50:32Z","status":"public","type":"journal_article","article_number":"025401","_id":"61825","project":[{"_id":"130","name":"TRR 285: Methodenentwicklung zur mechanischen Fügbarkeit in wandlungsfähigen Prozessketten"},{"name":"TRR 285 - Project Area C","_id":"133"},{"_id":"149","name":"TRR 285 - Subproject C05"}],"department":[{"_id":"630"}],"user_id":"93720","intvolume":" 36","citation":{"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.","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","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","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)."},"publication_identifier":{"issn":["0957-0233","1361-6501"]},"publication_status":"published","doi":"10.1088/1361-6501/ada05a","main_file_link":[{"url":"https://iopscience.iop.org/article/10.1088/1361-6501/ada05a/pdf","open_access":"1"}],"oa":"1","date_updated":"2026-02-12T10:45:36Z","volume":36,"author":[{"first_name":"Lorenz","full_name":"Butzhammer, Lorenz","last_name":"Butzhammer"},{"last_name":"Handke","full_name":"Handke, Niklas","first_name":"Niklas"},{"last_name":"Wittl","full_name":"Wittl, Simon","first_name":"Simon"},{"last_name":"Herl","full_name":"Herl, Gabriel","first_name":"Gabriel"},{"first_name":"Tino","last_name":"Hausotte","full_name":"Hausotte, Tino"}]},{"status":"public","editor":[{"full_name":"Quaas, Franziska","last_name":"Quaas","first_name":"Franziska"},{"full_name":"Raum, Theresia","last_name":"Raum","first_name":"Theresia"}],"publication":"Emotionen im Krieg - Krieg der Emotionen","type":"book_chapter","language":[{"iso":"eng"}],"department":[{"_id":"6"}],"series_title":"Hamburger Studien zu Gesellschaften und Kulturen der Vormoderne","user_id":"67185","_id":"48274","page":"139-158","citation":{"apa":"Foerster, A. (n.d.). Freudig in die Schlacht - Emotionen als Codes für die recta intentio im gerechten Krieg (8.- 10. Jahrhundert). In F. Quaas & T. Raum (Eds.), Emotionen im Krieg - Krieg der Emotionen (pp. 139–158). Franz Steiner Verlag.","mla":"Foerster, Anne. “Freudig in Die Schlacht - Emotionen Als Codes Für Die Recta Intentio Im Gerechten Krieg (8.- 10. Jahrhundert).” Emotionen Im Krieg - Krieg Der Emotionen, edited by Franziska Quaas and Theresia Raum, Franz Steiner Verlag, pp. 139–58.","bibtex":"@inbook{Foerster, place={Stuttgart}, series={Hamburger Studien zu Gesellschaften und Kulturen der Vormoderne}, title={Freudig in die Schlacht - Emotionen als Codes für die recta intentio im gerechten Krieg (8.- 10. Jahrhundert)}, booktitle={Emotionen im Krieg - Krieg der Emotionen}, publisher={Franz Steiner Verlag}, author={Foerster, Anne}, editor={Quaas, Franziska and Raum, Theresia}, pages={139–158}, collection={Hamburger Studien zu Gesellschaften und Kulturen der Vormoderne} }","short":"A. Foerster, in: F. Quaas, T. Raum (Eds.), Emotionen Im Krieg - Krieg Der Emotionen, Franz Steiner Verlag, Stuttgart, n.d., pp. 139–158.","ama":"Foerster A. Freudig in die Schlacht - Emotionen als Codes für die recta intentio im gerechten Krieg (8.- 10. Jahrhundert). In: Quaas F, Raum T, eds. Emotionen Im Krieg - Krieg Der Emotionen. Hamburger Studien zu Gesellschaften und Kulturen der Vormoderne. Franz Steiner Verlag; :139-158.","chicago":"Foerster, Anne. “Freudig in Die Schlacht - Emotionen Als Codes Für Die Recta Intentio Im Gerechten Krieg (8.- 10. Jahrhundert).” In Emotionen Im Krieg - Krieg Der Emotionen, edited by Franziska Quaas and Theresia Raum, 139–58. Hamburger Studien Zu Gesellschaften Und Kulturen Der Vormoderne. Stuttgart: Franz Steiner Verlag, n.d.","ieee":"A. Foerster, “Freudig in die Schlacht - Emotionen als Codes für die recta intentio im gerechten Krieg (8.- 10. Jahrhundert),” in Emotionen im Krieg - Krieg der Emotionen, F. Quaas and T. Raum, Eds. Stuttgart: Franz Steiner Verlag, pp. 139–158."},"place":"Stuttgart","year":"2025","publication_status":"accepted","title":"Freudig in die Schlacht - Emotionen als Codes für die recta intentio im gerechten Krieg (8.- 10. Jahrhundert)","author":[{"first_name":"Anne","last_name":"Foerster","full_name":"Foerster, Anne","id":"67185"}],"date_created":"2023-10-18T15:20:43Z","publisher":"Franz Steiner Verlag","date_updated":"2026-02-16T12:30:56Z"},{"publication":"Scientific Reports","type":"journal_article","status":"public","abstract":[{"lang":"eng","text":"This study presents an appealing approach to sustainable catalysis using cellulose filter paper as a support for copper-catalyzed reactions. The paper was functionalized with thiol groups through a reaction with thioglycolic acid, which served a dual purpose: partially reducing Cu(II) to Cu(I) and stabilizing active copper species via Cu–S interactions. Spectroscopic analysis confirmed the formation of highly dispersed multi-valent Cu2O/CuO on the thiol-functionalized cellulose, resulting in a highly efficient copper catalyst. This catalyst demonstrated excellent performance in the oxidative coupling of various amines to imines, achieving yields of 39–99% within 10–30 min. A key advantage of this system is its reusability; the catalyst maintained remarkable stability and activity over ten reaction cycles with straightforward recovery. This paper-based catalyst offers a promising strategy for eco-friendly and cost-effective synthetic processes, with significant implications for green chemistry and industrial applications."}],"user_id":"100715","_id":"64034","language":[{"iso":"eng"}],"extern":"1","issue":"1","publication_identifier":{"issn":["2045-2322"]},"intvolume":" 15","page":"9893","citation":{"apa":"Sangkaworn, J., Limprasart, W., Höfler, M. V., Gutmann, T., Pornsuwan, S., Bunchuay, T., & Tantirungrotechai, J. (2025). Copper-supported thiol-functionalized cellulose as a paper-based catalyst for imine synthesis. Scientific Reports, 15(1), 9893. https://doi.org/10.1038/s41598-025-95144-1","bibtex":"@article{Sangkaworn_Limprasart_Höfler_Gutmann_Pornsuwan_Bunchuay_Tantirungrotechai_2025, title={Copper-supported thiol-functionalized cellulose as a paper-based catalyst for imine synthesis}, volume={15}, DOI={10.1038/s41598-025-95144-1}, number={1}, journal={Scientific Reports}, author={Sangkaworn, Jariyaporn and Limprasart, Waranya and Höfler, Mark Valentin and Gutmann, Torsten and Pornsuwan, Soraya and Bunchuay, Thanthapatra and Tantirungrotechai, Jonggol}, year={2025}, pages={9893} }","short":"J. Sangkaworn, W. Limprasart, M.V. Höfler, T. Gutmann, S. Pornsuwan, T. Bunchuay, J. Tantirungrotechai, Scientific Reports 15 (2025) 9893.","mla":"Sangkaworn, Jariyaporn, et al. “Copper-Supported Thiol-Functionalized Cellulose as a Paper-Based Catalyst for Imine Synthesis.” Scientific Reports, vol. 15, no. 1, 2025, p. 9893, doi:10.1038/s41598-025-95144-1.","ama":"Sangkaworn J, Limprasart W, Höfler MV, et al. Copper-supported thiol-functionalized cellulose as a paper-based catalyst for imine synthesis. Scientific Reports. 2025;15(1):9893. doi:10.1038/s41598-025-95144-1","chicago":"Sangkaworn, Jariyaporn, Waranya Limprasart, Mark Valentin Höfler, Torsten Gutmann, Soraya Pornsuwan, Thanthapatra Bunchuay, and Jonggol Tantirungrotechai. “Copper-Supported Thiol-Functionalized Cellulose as a Paper-Based Catalyst for Imine Synthesis.” Scientific Reports 15, no. 1 (2025): 9893. https://doi.org/10.1038/s41598-025-95144-1.","ieee":"J. Sangkaworn et al., “Copper-supported thiol-functionalized cellulose as a paper-based catalyst for imine synthesis,” Scientific Reports, vol. 15, no. 1, p. 9893, 2025, doi: 10.1038/s41598-025-95144-1."},"year":"2025","volume":15,"date_created":"2026-02-07T16:07:27Z","author":[{"first_name":"Jariyaporn","last_name":"Sangkaworn","full_name":"Sangkaworn, Jariyaporn"},{"last_name":"Limprasart","full_name":"Limprasart, Waranya","first_name":"Waranya"},{"full_name":"Höfler, Mark Valentin","last_name":"Höfler","first_name":"Mark Valentin"},{"first_name":"Torsten","last_name":"Gutmann","full_name":"Gutmann, Torsten","id":"118165"},{"last_name":"Pornsuwan","full_name":"Pornsuwan, Soraya","first_name":"Soraya"},{"first_name":"Thanthapatra","full_name":"Bunchuay, Thanthapatra","last_name":"Bunchuay"},{"first_name":"Jonggol","last_name":"Tantirungrotechai","full_name":"Tantirungrotechai, Jonggol"}],"date_updated":"2026-02-17T16:13:44Z","doi":"10.1038/s41598-025-95144-1","title":"Copper-supported thiol-functionalized cellulose as a paper-based catalyst for imine synthesis"},{"doi":"10.1007/s10570-025-06848-6","title":"Time resolved mobility changes of ionic liquids in cellulose by in-situ solid state NMR spectroscopy","volume":32,"date_created":"2026-02-07T15:57:04Z","author":[{"last_name":"Lins","full_name":"Lins, Jonas","first_name":"Jonas"},{"first_name":"Lukas","last_name":"Pachernegg-Mair","full_name":"Pachernegg-Mair, Lukas"},{"first_name":"Mark V.","last_name":"Höfler","full_name":"Höfler, Mark V."},{"last_name":"Hajialilou","full_name":"Hajialilou, Solmaz","first_name":"Solmaz"},{"last_name":"Spirk","full_name":"Spirk, Stefan","first_name":"Stefan"},{"first_name":"Torsten","last_name":"Gutmann","full_name":"Gutmann, Torsten","id":"118165"}],"date_updated":"2026-02-17T16:15:25Z","page":"10439–10453","intvolume":" 32","citation":{"ama":"Lins J, Pachernegg-Mair L, Höfler MV, Hajialilou S, Spirk S, Gutmann T. Time resolved mobility changes of ionic liquids in cellulose by in-situ solid state NMR spectroscopy. Cellulose. 2025;32(18):10439–10453. doi:10.1007/s10570-025-06848-6","chicago":"Lins, Jonas, Lukas Pachernegg-Mair, Mark V. Höfler, Solmaz Hajialilou, Stefan Spirk, and Torsten Gutmann. “Time Resolved Mobility Changes of Ionic Liquids in Cellulose by In-Situ Solid State NMR Spectroscopy.” Cellulose 32, no. 18 (2025): 10439–10453. https://doi.org/10.1007/s10570-025-06848-6.","ieee":"J. Lins, L. Pachernegg-Mair, M. V. Höfler, S. Hajialilou, S. Spirk, and T. Gutmann, “Time resolved mobility changes of ionic liquids in cellulose by in-situ solid state NMR spectroscopy,” Cellulose, vol. 32, no. 18, pp. 10439–10453, 2025, doi: 10.1007/s10570-025-06848-6.","apa":"Lins, J., Pachernegg-Mair, L., Höfler, M. V., Hajialilou, S., Spirk, S., & Gutmann, T. (2025). Time resolved mobility changes of ionic liquids in cellulose by in-situ solid state NMR spectroscopy. Cellulose, 32(18), 10439–10453. https://doi.org/10.1007/s10570-025-06848-6","mla":"Lins, Jonas, et al. “Time Resolved Mobility Changes of Ionic Liquids in Cellulose by In-Situ Solid State NMR Spectroscopy.” Cellulose, vol. 32, no. 18, 2025, pp. 10439–10453, doi:10.1007/s10570-025-06848-6.","bibtex":"@article{Lins_Pachernegg-Mair_Höfler_Hajialilou_Spirk_Gutmann_2025, title={Time resolved mobility changes of ionic liquids in cellulose by in-situ solid state NMR spectroscopy}, volume={32}, DOI={10.1007/s10570-025-06848-6}, number={18}, journal={Cellulose}, author={Lins, Jonas and Pachernegg-Mair, Lukas and Höfler, Mark V. and Hajialilou, Solmaz and Spirk, Stefan and Gutmann, Torsten}, year={2025}, pages={10439–10453} }","short":"J. Lins, L. Pachernegg-Mair, M.V. Höfler, S. Hajialilou, S. Spirk, T. Gutmann, Cellulose 32 (2025) 10439–10453."},"year":"2025","issue":"18","publication_identifier":{"issn":["0969-0239"]},"language":[{"iso":"eng"}],"extern":"1","user_id":"100715","_id":"64009","status":"public","abstract":[{"text":"The understanding of the interactions between cellulose and ionic liquids are the foundation for the development of new processes, to explore new reactions and to establish a circular bioeconomy. The main problem is that direct measurement, from both quantitative and qualitative point of view is challenging. While there are methods to assess solution strength and wettability of ionic liquids with cellulose materials, the main challenge lies in the combination of a solid substrate and an applied liquid, limiting the number of accessible methods. We demonstrate in this paper that an in-situ solid-state NMR spectroscopical approach is capable of monitoring in real-time the mobility of ionic liquids in cellulose-based substrates. Specifically, we employ 1H → 13C cross polarization magic angle spinning (CP MAS) NMR spectroscopy to examine mobility changes over varying exposure times in paper samples treated with ionic liquids. Through this approach, we capture the temporal evolution of IL signals, which in turn provide insights into mobility changes of ILs and also allow for identifying changes in cellulose crystallinity. The approach allows for a simple, semiquantitative assessment of cellulose solubility in ionic liquids and is in principle applicable to other biomass materials as well.","lang":"eng"}],"publication":"Cellulose","type":"journal_article"},{"publisher":"The Royal Society of Chemistry","date_updated":"2026-02-17T16:16:36Z","volume":61,"author":[{"last_name":"Hutsch","full_name":"Hutsch, Stefanie","first_name":"Stefanie"},{"first_name":"Sven","full_name":"Grätz, Sven","last_name":"Grätz"},{"first_name":"Jonas","last_name":"Lins","full_name":"Lins, Jonas"},{"id":"118165","full_name":"Gutmann, Torsten","last_name":"Gutmann","first_name":"Torsten"},{"full_name":"Borchardt, Lars","last_name":"Borchardt","first_name":"Lars"}],"date_created":"2026-02-07T15:47:03Z","title":"Solid-state polycyclotrimerization of diynes to porous organic polymers","doi":"10.1039/D5CC04700E","publication_identifier":{"issn":["1359-7345"]},"issue":"80","year":"2025","intvolume":" 61","page":"15622–15625","citation":{"short":"S. Hutsch, S. Grätz, J. Lins, T. Gutmann, L. Borchardt, Chemical Communications 61 (2025) 15622–15625.","mla":"Hutsch, Stefanie, et al. “Solid-State Polycyclotrimerization of Diynes to Porous Organic Polymers.” Chemical Communications, vol. 61, no. 80, The Royal Society of Chemistry, 2025, pp. 15622–15625, doi:10.1039/D5CC04700E.","bibtex":"@article{Hutsch_Grätz_Lins_Gutmann_Borchardt_2025, title={Solid-state polycyclotrimerization of diynes to porous organic polymers}, volume={61}, DOI={10.1039/D5CC04700E}, number={80}, journal={Chemical Communications}, publisher={The Royal Society of Chemistry}, author={Hutsch, Stefanie and Grätz, Sven and Lins, Jonas and Gutmann, Torsten and Borchardt, Lars}, year={2025}, pages={15622–15625} }","apa":"Hutsch, S., Grätz, S., Lins, J., Gutmann, T., & Borchardt, L. (2025). Solid-state polycyclotrimerization of diynes to porous organic polymers. Chemical Communications, 61(80), 15622–15625. https://doi.org/10.1039/D5CC04700E","ama":"Hutsch S, Grätz S, Lins J, Gutmann T, Borchardt L. Solid-state polycyclotrimerization of diynes to porous organic polymers. Chemical Communications. 2025;61(80):15622–15625. doi:10.1039/D5CC04700E","ieee":"S. Hutsch, S. Grätz, J. Lins, T. Gutmann, and L. Borchardt, “Solid-state polycyclotrimerization of diynes to porous organic polymers,” Chemical Communications, vol. 61, no. 80, pp. 15622–15625, 2025, doi: 10.1039/D5CC04700E.","chicago":"Hutsch, Stefanie, Sven Grätz, Jonas Lins, Torsten Gutmann, and Lars Borchardt. “Solid-State Polycyclotrimerization of Diynes to Porous Organic Polymers.” Chemical Communications 61, no. 80 (2025): 15622–15625. https://doi.org/10.1039/D5CC04700E."},"_id":"63990","user_id":"100715","extern":"1","language":[{"iso":"eng"}],"publication":"Chemical Communications","type":"journal_article","abstract":[{"text":"Herein, we report a solid-state polycyclotrimerization of 1,4-diethynylbenzene using mechanochemical activation in a ball mill, yielding a highly porous and hydrophobic hyperbranched polymer (HBP) with a specific surface area of up to 570 m2 g−1. The reaction, catalyzed by Fe(hmds)2 and conducted under solvent-free conditions, was optimized by varying milling time and frequency. This method enables the efficient synthesis of insoluble, porous organic polymers with high yields (up to 95%) and offers an environmentally friendly alternative to traditional solution-based polymerizations.","lang":"eng"}],"status":"public"},{"status":"public","abstract":[{"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.","lang":"eng"}],"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":{"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.","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.","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","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","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.","short":"M.M. Hoffmann, T. Gutmann, G. Buntkowsky, Journal of Chemical & Engineering Data 70 (2025) 600–606.","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} }"},"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.","last_name":"Hoffmann","full_name":"Hoffmann, Markus M."},{"first_name":"Torsten","id":"118165","full_name":"Gutmann, Torsten","last_name":"Gutmann"},{"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"},{"place":"Paderborn","year":"2025","citation":{"bibtex":"@book{Dumitrescu_Hölzle_2025, place={Paderborn}, title={Vorausschau und Technologieplanung - 19. Symposium für Vorausschau und Technologieplanung}, DOI={10.17619/UNIPB/1-2467}, publisher={Verlagsschriftenreihe des Heinz Nixdorf Instituts}, year={2025} }","short":"R. Dumitrescu, K. Hölzle, eds., Vorausschau Und Technologieplanung - 19. Symposium Für Vorausschau Und Technologieplanung, Verlagsschriftenreihe des Heinz Nixdorf Instituts, Paderborn, 2025.","mla":"Dumitrescu, Roman, and Katharina Hölzle, editors. Vorausschau Und Technologieplanung - 19. Symposium Für Vorausschau Und Technologieplanung. Verlagsschriftenreihe des Heinz Nixdorf Instituts, 2025, doi:10.17619/UNIPB/1-2467.","apa":"Dumitrescu, R., & Hölzle, K. (Eds.). (2025). Vorausschau und Technologieplanung - 19. Symposium für Vorausschau und Technologieplanung. Verlagsschriftenreihe des Heinz Nixdorf Instituts. https://doi.org/10.17619/UNIPB/1-2467","ama":"Dumitrescu R, Hölzle K, eds. Vorausschau Und Technologieplanung - 19. Symposium Für Vorausschau Und Technologieplanung. Verlagsschriftenreihe des Heinz Nixdorf Instituts; 2025. doi:10.17619/UNIPB/1-2467","ieee":"R. Dumitrescu and K. Hölzle, Eds., Vorausschau und Technologieplanung - 19. Symposium für Vorausschau und Technologieplanung. Paderborn: Verlagsschriftenreihe des Heinz Nixdorf Instituts, 2025.","chicago":"Dumitrescu, Roman, and Katharina Hölzle, eds. Vorausschau Und Technologieplanung - 19. Symposium Für Vorausschau Und Technologieplanung. Paderborn: Verlagsschriftenreihe des Heinz Nixdorf Instituts, 2025. https://doi.org/10.17619/UNIPB/1-2467."},"title":"Vorausschau und Technologieplanung - 19. Symposium für Vorausschau und Technologieplanung","doi":"10.17619/UNIPB/1-2467","date_updated":"2026-02-19T10:37:27Z","publisher":"Verlagsschriftenreihe des Heinz Nixdorf Instituts","date_created":"2026-02-19T10:36:46Z","editor":[{"last_name":"Dumitrescu","full_name":"Dumitrescu, Roman","id":"16190","first_name":"Roman"},{"last_name":"Hölzle","full_name":"Hölzle, Katharina","first_name":"Katharina"}],"status":"public","type":"conference_editor","language":[{"iso":"eng"}],"_id":"64257","department":[{"_id":"563"}],"user_id":"15782"},{"date_updated":"2026-02-19T11:43:16Z","date_created":"2026-02-19T11:42:22Z","author":[{"first_name":"Tommaso","last_name":"Bruno","full_name":"Bruno, Tommaso"},{"last_name":"Papageorgiou","full_name":"Papageorgiou, Effie","first_name":"Effie"}],"title":"Blow-up exponents and a semilinear elliptic equation for the fractional Laplacian on hyperbolic spaces","year":"2025","citation":{"mla":"Bruno, Tommaso, and Effie Papageorgiou. “Blow-up Exponents and a Semilinear Elliptic Equation for the Fractional Laplacian on Hyperbolic Spaces.” ArXiv:2509.12349, 2025.","bibtex":"@article{Bruno_Papageorgiou_2025, title={Blow-up exponents and a semilinear elliptic equation for the fractional Laplacian on hyperbolic spaces}, journal={arXiv:2509.12349}, author={Bruno, Tommaso and Papageorgiou, Effie}, year={2025} }","short":"T. Bruno, E. Papageorgiou, ArXiv:2509.12349 (2025).","ama":"Bruno T, Papageorgiou E. Blow-up exponents and a semilinear elliptic equation for the fractional Laplacian on hyperbolic spaces. arXiv:250912349. Published online 2025.","apa":"Bruno, T., & Papageorgiou, E. (2025). Blow-up exponents and a semilinear elliptic equation for the fractional Laplacian on hyperbolic spaces. In arXiv:2509.12349.","chicago":"Bruno, Tommaso, and Effie Papageorgiou. “Blow-up Exponents and a Semilinear Elliptic Equation for the Fractional Laplacian on Hyperbolic Spaces.” ArXiv:2509.12349, 2025.","ieee":"T. Bruno and E. Papageorgiou, “Blow-up exponents and a semilinear elliptic equation for the fractional Laplacian on hyperbolic spaces,” arXiv:2509.12349. 2025."},"_id":"64267","external_id":{"arxiv":["2509.12349"]},"project":[{"name":"TRR 358: Ganzzahlige Strukturen in Geometrie und Darstellungstheorie","_id":"357"}],"user_id":"100325","language":[{"iso":"eng"}],"publication":"arXiv:2509.12349","type":"preprint","abstract":[{"lang":"eng","text":"Let $\\mathbb{H}^n$ be the $n$-dimensional real hyperbolic space, $Δ$ its nonnegative Laplace--Beltrami operator whose bottom of the spectrum we denote by $λ_{0}$, and $σ\\in (0,1)$.\r\n The aim of this paper is twofold. On the one hand, we determine the Fujita exponent for the fractional heat equation \\[\\partial_{t} u + Δ^σu = e^{βt}|u|^{γ-1}u,\\] by proving that nontrivial positive global solutions exist if and only if $γ\\geq 1 + β/ λ_{0}^σ$. On the other hand, we prove the existence of non-negative, bounded and finite energy solutions of the semilinear fractional elliptic equation \\[\r\n Δ^σ v - λ^σ v - v^γ=0 \\] for $0\\leq λ\\leq λ_{0}$ and $1<γ< \\frac{n+2σ}{n-2σ}$. The two problems are known to be connected and the latter, aside from its independent interest, is actually instrumental to the former.\r\n \\smallskip\r\n At the core of our results stands a novel fractional Poincaré-type inequality expressed in terms of a new scale of $L^{2}$ fractional Sobolev spaces, which sharpens those known so far, and which holds more generally on Riemannian symmetric spaces of non-compact type. We also establish an associated Rellich--Kondrachov-like compact embedding theorem for radial functions, along with other related properties."}],"status":"public"},{"status":"public","type":"journal_article","article_type":"original","file_date_updated":"2026-02-19T14:14:39Z","project":[{"name":"TRR 358 - Ganzzahlige Strukturen in Geometrie und Darstellungstheorie","_id":"357"}],"_id":"56717","user_id":"73664","department":[{"_id":"555"}],"citation":{"apa":"Langen, L., & Rösler, M. (2025). Multiresolution analysis on spectra of hermitian matrices. Indagationes Mathematicae, 36(6), 1671–1694.","short":"L. Langen, M. Rösler, Indagationes Mathematicae 36 (2025) 1671–1694.","bibtex":"@article{Langen_Rösler_2025, title={Multiresolution analysis on spectra of hermitian matrices}, volume={36}, number={6}, journal={Indagationes Mathematicae}, publisher={Elsevier}, author={Langen, Lukas and Rösler, Margit}, year={2025}, pages={1671–1694} }","mla":"Langen, Lukas, and Margit Rösler. “Multiresolution Analysis on Spectra of Hermitian Matrices.” Indagationes Mathematicae, vol. 36, no. 6, Elsevier, 2025, pp. 1671–94.","ama":"Langen L, Rösler M. Multiresolution analysis on spectra of hermitian matrices. Indagationes Mathematicae. 2025;36(6):1671-1694.","ieee":"L. Langen and M. Rösler, “Multiresolution analysis on spectra of hermitian matrices,” Indagationes Mathematicae, vol. 36, no. 6, pp. 1671–1694, 2025.","chicago":"Langen, Lukas, and Margit Rösler. “Multiresolution Analysis on Spectra of Hermitian Matrices.” Indagationes Mathematicae 36, no. 6 (2025): 1671–94."},"page":"1671-1694","intvolume":" 36","publication_status":"published","has_accepted_license":"1","related_material":{"link":[{"url":"https://arxiv.org/abs/2410.10364","relation":"research_paper"}]},"main_file_link":[{"url":"https://doi.org/10.1016/j.indag.2025.03.009"}],"date_updated":"2026-02-19T14:16:43Z","author":[{"first_name":"Lukas","last_name":"Langen","full_name":"Langen, Lukas","id":"73664"},{"last_name":"Rösler","id":"37390","full_name":"Rösler, Margit","first_name":"Margit"}],"volume":36,"abstract":[{"lang":"eng","text":"We establish a multiresolution analysis on the space $\\text{Herm}(n)$ of\r\n$n\\times n$ complex Hermitian matrices which is adapted to invariance under\r\nconjugation by the unitary group $U(n).$ The orbits under this action are\r\nparametrized by the possible ordered spectra of Hermitian matrices, which\r\nconstitute a closed Weyl chamber of type $A_{n-1}$ in $\\mathbb R^n.$ The space\r\n$L^2(\\text{Herm}(n))^{U(n)}$ of radial, i.e. $U(n)$-invariant $L^2$-functions\r\non $\\text{Herm}(n)$ is naturally identified with a certain weighted $L^2$-space\r\non this chamber.\r\n The scale spaces of our multiresolution analysis are obtained by usual dyadic\r\ndilations as well as generalized translations of a scaling function, where the\r\ngeneralized translation is a hypergroup translation which respects the radial\r\ngeometry. We provide a concise criterion to characterize orthonormal wavelet\r\nbases and show that such bases always exist. They provide natural orthonormal\r\nbases of the space $L^2(\\text{Herm}(n))^{U(n)}.$\r\n Furthermore, we show how to obtain radial scaling functions from classical\r\nscaling functions on $\\mathbb R^{n}$. Finally, generalizations related to the\r\nCartan decompositions for general compact Lie groups are indicated."}],"file":[{"content_type":"application/pdf","success":1,"relation":"main_file","date_updated":"2026-02-19T14:14:39Z","date_created":"2026-02-19T14:14:39Z","creator":"llangen","file_size":443262,"file_id":"64288","file_name":"MSA_hermitsch_published.pdf","access_level":"closed"}],"publication":"Indagationes Mathematicae","ddc":["510"],"language":[{"iso":"eng"}],"external_id":{"arxiv":["2410.10364"]},"year":"2025","issue":"6","title":"Multiresolution analysis on spectra of hermitian matrices","publisher":"Elsevier","date_created":"2024-10-22T09:31:19Z"},{"title":"Generalized Positive Energy Representations of the Group of Compactly Supported Diffeomorphisms","doi":"10.1007/s00220-024-05226-w","date_updated":"2026-02-20T09:41:41Z","publisher":"Springer Science and Business Media LLC","volume":406,"date_created":"2026-02-20T09:33:11Z","author":[{"first_name":"Bas","last_name":"Janssens","full_name":"Janssens, Bas"},{"full_name":"Niestijl, Milan","last_name":"Niestijl","first_name":"Milan"}],"year":"2025","intvolume":" 406","citation":{"apa":"Janssens, B., & Niestijl, M. (2025). Generalized Positive Energy Representations of the Group of Compactly Supported Diffeomorphisms. Communications in Mathematical Physics, 406(2), Article 45. https://doi.org/10.1007/s00220-024-05226-w","short":"B. Janssens, M. Niestijl, Communications in Mathematical Physics 406 (2025).","bibtex":"@article{Janssens_Niestijl_2025, title={Generalized Positive Energy Representations of the Group of Compactly Supported Diffeomorphisms}, volume={406}, DOI={10.1007/s00220-024-05226-w}, number={245}, journal={Communications in Mathematical Physics}, publisher={Springer Science and Business Media LLC}, author={Janssens, Bas and Niestijl, Milan}, year={2025} }","mla":"Janssens, Bas, and Milan Niestijl. “Generalized Positive Energy Representations of the Group of Compactly Supported Diffeomorphisms.” Communications in Mathematical Physics, vol. 406, no. 2, 45, Springer Science and Business Media LLC, 2025, doi:10.1007/s00220-024-05226-w.","chicago":"Janssens, Bas, and Milan Niestijl. “Generalized Positive Energy Representations of the Group of Compactly Supported Diffeomorphisms.” Communications in Mathematical Physics 406, no. 2 (2025). https://doi.org/10.1007/s00220-024-05226-w.","ieee":"B. Janssens and M. Niestijl, “Generalized Positive Energy Representations of the Group of Compactly Supported Diffeomorphisms,” Communications in Mathematical Physics, vol. 406, no. 2, Art. no. 45, 2025, doi: 10.1007/s00220-024-05226-w.","ama":"Janssens B, Niestijl M. Generalized Positive Energy Representations of the Group of Compactly Supported Diffeomorphisms. Communications in Mathematical Physics. 2025;406(2). doi:10.1007/s00220-024-05226-w"},"publication_identifier":{"issn":["0010-3616","1432-0916"]},"publication_status":"published","issue":"2","article_number":"45","language":[{"iso":"eng"}],"_id":"64289","department":[{"_id":"93"}],"user_id":"104095","abstract":[{"text":"Abstract\r\n Motivated by asymptotic symmetry groups in general relativity, we consider projective unitary representations \r\n \r\n $$\\overline{\\rho }$$\r\n \r\n \r\n ρ\r\n ¯\r\n \r\n \r\n \r\n of the Lie group \r\n \r\n $${{\\,\\textrm{Diff}\\,}}_c(M)$$\r\n \r\n \r\n \r\n \r\n \r\n Diff\r\n \r\n \r\n c\r\n \r\n \r\n (\r\n M\r\n )\r\n \r\n \r\n \r\n \r\n of compactly supported diffeomorphisms of a smooth manifold M that satisfy a so-called generalized positive energy condition. In particular, this captures representations that are in a suitable sense compatible with a KMS state on the von Neumann algebra generated by \r\n \r\n $$\\overline{\\rho }$$\r\n \r\n \r\n ρ\r\n ¯\r\n \r\n \r\n \r\n . We show that if M is connected and \r\n \r\n $$\\dim (M) > 1$$\r\n \r\n \r\n dim\r\n (\r\n M\r\n )\r\n >\r\n 1\r\n \r\n \r\n \r\n , then any such representation is necessarily trivial on the identity component \r\n \r\n $${{\\,\\textrm{Diff}\\,}}_c(M)_0$$\r\n \r\n \r\n \r\n \r\n \r\n Diff\r\n \r\n \r\n c\r\n \r\n \r\n \r\n (\r\n M\r\n )\r\n \r\n 0\r\n \r\n \r\n \r\n \r\n . As an intermediate step towards this result, we determine the continuous second Lie algebra cohomology \r\n \r\n $$H^2_\\textrm{ct}(\\mathcal {X}_c(M), \\mathbb {R})$$\r\n \r\n \r\n \r\n H\r\n ct\r\n 2\r\n \r\n \r\n (\r\n \r\n X\r\n c\r\n \r\n \r\n (\r\n M\r\n )\r\n \r\n ,\r\n R\r\n )\r\n \r\n \r\n \r\n \r\n of the Lie algebra of compactly supported vector fields. This is subtly different from Gelfand–Fuks cohomology in view of the compact support condition.","lang":"eng"}],"status":"public","publication":"Communications in Mathematical Physics","type":"journal_article"},{"type":"book","status":"public","_id":"63411","department":[{"_id":"157"}],"user_id":"65085","language":[{"iso":"ger"}],"quality_controlled":"1","publication_identifier":{"isbn":["978-3-96780-219-1"]},"publication_status":"published","year":"2025","citation":{"apa":"Meschut, G., Yang, K., Rethmeier, M., & El-Sari, B. (2025). Entwicklung eines methodischen Ansatzes zur Vermeidung der Spritzerbildung beim Widerstandspunktschweißen durch multiparametrische Prozessanalyse mittels künstlicher Intelligenz.","bibtex":"@book{Meschut_Yang_Rethmeier_El-Sari_2025, title={Entwicklung eines methodischen Ansatzes zur Vermeidung der Spritzerbildung beim Widerstandspunktschweißen durch multiparametrische Prozessanalyse mittels künstlicher Intelligenz}, author={Meschut, Gerson and Yang, Keke and Rethmeier, Michael and El-Sari, Bassel}, year={2025} }","mla":"Meschut, Gerson, et al. Entwicklung eines methodischen Ansatzes zur Vermeidung der Spritzerbildung beim Widerstandspunktschweißen durch multiparametrische Prozessanalyse mittels künstlicher Intelligenz. 2025.","short":"G. Meschut, K. Yang, M. Rethmeier, B. El-Sari, Entwicklung eines methodischen Ansatzes zur Vermeidung der Spritzerbildung beim Widerstandspunktschweißen durch multiparametrische Prozessanalyse mittels künstlicher Intelligenz, 2025.","chicago":"Meschut, Gerson, Keke Yang, Michael Rethmeier, and Bassel El-Sari. Entwicklung eines methodischen Ansatzes zur Vermeidung der Spritzerbildung beim Widerstandspunktschweißen durch multiparametrische Prozessanalyse mittels künstlicher Intelligenz, 2025.","ieee":"G. Meschut, K. Yang, M. Rethmeier, and B. El-Sari, Entwicklung eines methodischen Ansatzes zur Vermeidung der Spritzerbildung beim Widerstandspunktschweißen durch multiparametrische Prozessanalyse mittels künstlicher Intelligenz. 2025.","ama":"Meschut G, Yang K, Rethmeier M, El-Sari B. Entwicklung eines methodischen Ansatzes zur Vermeidung der Spritzerbildung beim Widerstandspunktschweißen durch multiparametrische Prozessanalyse mittels künstlicher Intelligenz.; 2025."},"date_updated":"2026-02-23T10:26:51Z","author":[{"first_name":"Gerson","id":"32056","full_name":"Meschut, Gerson","last_name":"Meschut","orcid":"0000-0002-2763-1246"},{"id":"65085","full_name":"Yang, Keke","last_name":"Yang","orcid":"0000-0001-9201-9304","first_name":"Keke"},{"first_name":"Michael","full_name":"Rethmeier, Michael","last_name":"Rethmeier"},{"full_name":"El-Sari, Bassel","last_name":"El-Sari","first_name":"Bassel"}],"date_created":"2025-12-24T09:21:18Z","title":"Entwicklung eines methodischen Ansatzes zur Vermeidung der Spritzerbildung beim Widerstandspunktschweißen durch multiparametrische Prozessanalyse mittels künstlicher Intelligenz"},{"publisher":"Materials Research Forum LLC","date_created":"2025-05-13T06:54:20Z","title":"Experimental and numerical investigation of the influence of rolling-induced sheet metal deformation on SPR joints","quality_controlled":"1","year":"2025","language":[{"iso":"eng"}],"publication":"Materials Research Proceedings","abstract":[{"text":"Abstract. In the development of advanced lightweight automotive solutions, self-piercing riveting (SPR) offers the possibility of joining multi-material structures to fulfil a wide variety of requirements. With regard to the entire process chain, production-related pre-deformations of the parts to be joined can influence the geometric shape and load capacity of SPR joints. Various studies have investigated the influence of pre-stretched sheet materials, in the sense of pre-drawing processes, on the formation of SPR joints. The impact of pre-stretching sheet metals on the formation of their geometrical characteristics and the shear-tensile strength of SPR processes was observed [1]. Pre-rolled semi-finished products are also joined together in mixed material automotive structures, e.g. tailor rolled blanks. This work aims to investigate the influence of pre-rolled joining parts on the geometric formation and load-carrying capacity of SPR joints. For this purpose, sheets of metal are cold-formed using a rolling process to induce a defined strain-hardening state in the material and then joined in various combinations. As the degree of deformation increases, the rolling of samples can lead to minimal accumulation of damage in the sheet materials, which can influence the joint behaviour. The rolling process, as well as the subsequent joining process, are also investigated by FEM. The influence of pre-rolled semi-finished products on the strength of the SPR joints is investigated.","lang":"eng"}],"date_updated":"2026-02-24T13:42:57Z","volume":54,"author":[{"last_name":"Schlichter","id":"61977","full_name":"Schlichter, Malte Christian","first_name":"Malte Christian"},{"first_name":"Özcan","full_name":"Harabati, Özcan","last_name":"Harabati"},{"first_name":"Jean-Patrick","last_name":"Ludwig","id":"76631","full_name":"Ludwig, Jean-Patrick"},{"first_name":"Max","id":"45779","full_name":"Böhnke, Max","last_name":"Böhnke"},{"last_name":"Bielak","full_name":"Bielak, Christian Roman","id":"34782","first_name":"Christian Roman"},{"first_name":"Mathias","id":"7850","full_name":"Bobbert, Mathias","last_name":"Bobbert"},{"first_name":"Gerson","orcid":"0000-0002-2763-1246","last_name":"Meschut","id":"32056","full_name":"Meschut, Gerson"}],"doi":"10.21741/9781644903599-148","publication_identifier":{"issn":["2474-395X"]},"publication_status":"published","place":"Paestum","intvolume":" 54","citation":{"bibtex":"@inproceedings{Schlichter_Harabati_Ludwig_Böhnke_Bielak_Bobbert_Meschut_2025, place={Paestum}, title={Experimental and numerical investigation of the influence of rolling-induced sheet metal deformation on SPR joints}, volume={54}, DOI={10.21741/9781644903599-148}, booktitle={Materials Research Proceedings}, publisher={Materials Research Forum LLC}, author={Schlichter, Malte Christian and Harabati, Özcan and Ludwig, Jean-Patrick and Böhnke, Max and Bielak, Christian Roman and Bobbert, Mathias and Meschut, Gerson}, year={2025} }","short":"M.C. Schlichter, Ö. Harabati, J.-P. Ludwig, M. Böhnke, C.R. Bielak, M. Bobbert, G. Meschut, in: Materials Research Proceedings, Materials Research Forum LLC, Paestum, 2025.","mla":"Schlichter, Malte Christian, et al. “Experimental and Numerical Investigation of the Influence of Rolling-Induced Sheet Metal Deformation on SPR Joints.” Materials Research Proceedings, vol. 54, Materials Research Forum LLC, 2025, doi:10.21741/9781644903599-148.","apa":"Schlichter, M. C., Harabati, Ö., Ludwig, J.-P., Böhnke, M., Bielak, C. R., Bobbert, M., & Meschut, G. (2025). Experimental and numerical investigation of the influence of rolling-induced sheet metal deformation on SPR joints. Materials Research Proceedings, 54. https://doi.org/10.21741/9781644903599-148","ama":"Schlichter MC, Harabati Ö, Ludwig J-P, et al. Experimental and numerical investigation of the influence of rolling-induced sheet metal deformation on SPR joints. In: Materials Research Proceedings. Vol 54. Materials Research Forum LLC; 2025. doi:10.21741/9781644903599-148","chicago":"Schlichter, Malte Christian, Özcan Harabati, Jean-Patrick Ludwig, Max Böhnke, Christian Roman Bielak, Mathias Bobbert, and Gerson Meschut. “Experimental and Numerical Investigation of the Influence of Rolling-Induced Sheet Metal Deformation on SPR Joints.” In Materials Research Proceedings, Vol. 54. Paestum: Materials Research Forum LLC, 2025. https://doi.org/10.21741/9781644903599-148.","ieee":"M. C. Schlichter et al., “Experimental and numerical investigation of the influence of rolling-induced sheet metal deformation on SPR joints,” in Materials Research Proceedings, 2025, vol. 54, doi: 10.21741/9781644903599-148."},"_id":"59878","project":[{"name":"TRR 285 - A: TRR 285 - Project Area A","_id":"131"},{"name":"TRR 285 – A01: TRR 285 - Subproject A01","_id":"135"},{"_id":"130","name":"TRR 285: Methodenentwicklung zur mechanischen Fügbarkeit in wandlungsfähigen Prozessketten"}],"department":[{"_id":"157"}],"user_id":"7850","type":"conference","status":"public"},{"language":[{"iso":"eng"}],"_id":"60977","project":[{"_id":"135","name":"TRR 285 - Subproject A01"},{"name":"TRR 285 - Project Area A","_id":"131"},{"_id":"130","name":"TRR 285: Methodenentwicklung zur mechanischen Fügbarkeit in wandlungsfähigen Prozessketten"}],"department":[{"_id":"157"}],"user_id":"7850","abstract":[{"text":"In the development of advanced lightweight automotive solutions, self-piercing riveting (SPR) offers the possibility of joining multi-material structures to fulfil a wide variety of requirements. With regard to the entire process chain, production-related pre-deformations of the parts to be joined can influence the geometric shape and load capacity of SPR joints. Various studies have investigated the influence of pre-stretched sheet materials, in the sense of pre-drawing processes, on the formation of SPR joints. The impact of pre-stretching sheet metals on the formation of their geometrical characteristics and the shear-tensile strength of SPR processes was observed [1]. Pre-rolled semi-finished products are also joined together in mixed material automotive structures, e.g. tailor rolled blanks. This work aims to investigate the influence of pre-rolled joining parts on the geometric formation and load-carrying capacity of SPR joints. For this purpose, sheets of metal are cold-formed using a rolling process to induce a defined strain-hardening state in the material and then joined in various combinations. As the degree of deformation increases, the rolling of samples can lead to minimal accumulation of damage in the sheet materials, which can influence the joint behaviour. The rolling process, as well as the subsequent joining process, are also investigated by FEM. The influence of pre-rolled semi-finished products on the strength of the SPR joints is investigated.","lang":"eng"}],"status":"public","publication":"Materials Research Proceedings","type":"conference","title":"Experimental and numerical investigation of the influence of rolling-induced sheet metal deformation on SPR joints","doi":"10.21741/9781644903599-148","date_updated":"2026-02-24T14:02:01Z","publisher":"Materials Research Forum LLC","volume":54,"author":[{"last_name":"Schlichter","id":"61977","full_name":"Schlichter, Malte Christian","first_name":"Malte Christian"},{"last_name":"Harabati","full_name":"Harabati, Özcan","id":"54972","first_name":"Özcan"},{"first_name":"Jean-Patrick","id":"76631","full_name":"Ludwig, Jean-Patrick","last_name":"Ludwig"},{"first_name":"Max","id":"45779","full_name":"Böhnke, Max","last_name":"Böhnke"},{"first_name":"Christian Roman","full_name":"Bielak, Christian Roman","id":"34782","last_name":"Bielak"},{"first_name":"Mathias","last_name":"Bobbert","id":"7850","full_name":"Bobbert, Mathias"},{"first_name":"Gerson","last_name":"Meschut","orcid":"0000-0002-2763-1246","full_name":"Meschut, Gerson","id":"32056"}],"date_created":"2025-08-22T10:20:15Z","year":"2025","intvolume":" 54","citation":{"ama":"Schlichter MC, Harabati Ö, Ludwig J-P, et al. Experimental and numerical investigation of the influence of rolling-induced sheet metal deformation on SPR joints. In: Materials Research Proceedings. Vol 54. Materials Research Forum LLC; 2025. doi:10.21741/9781644903599-148","ieee":"M. C. Schlichter et al., “Experimental and numerical investigation of the influence of rolling-induced sheet metal deformation on SPR joints,” in Materials Research Proceedings, 2025, vol. 54, doi: 10.21741/9781644903599-148.","chicago":"Schlichter, Malte Christian, Özcan Harabati, Jean-Patrick Ludwig, Max Böhnke, Christian Roman Bielak, Mathias Bobbert, and Gerson Meschut. “Experimental and Numerical Investigation of the Influence of Rolling-Induced Sheet Metal Deformation on SPR Joints.” In Materials Research Proceedings, Vol. 54. Materials Research Forum LLC, 2025. https://doi.org/10.21741/9781644903599-148.","apa":"Schlichter, M. C., Harabati, Ö., Ludwig, J.-P., Böhnke, M., Bielak, C. R., Bobbert, M., & Meschut, G. (2025). Experimental and numerical investigation of the influence of rolling-induced sheet metal deformation on SPR joints. Materials Research Proceedings, 54. https://doi.org/10.21741/9781644903599-148","bibtex":"@inproceedings{Schlichter_Harabati_Ludwig_Böhnke_Bielak_Bobbert_Meschut_2025, title={Experimental and numerical investigation of the influence of rolling-induced sheet metal deformation on SPR joints}, volume={54}, DOI={10.21741/9781644903599-148}, booktitle={Materials Research Proceedings}, publisher={Materials Research Forum LLC}, author={Schlichter, Malte Christian and Harabati, Özcan and Ludwig, Jean-Patrick and Böhnke, Max and Bielak, Christian Roman and Bobbert, Mathias and Meschut, Gerson}, year={2025} }","mla":"Schlichter, Malte Christian, et al. “Experimental and Numerical Investigation of the Influence of Rolling-Induced Sheet Metal Deformation on SPR Joints.” Materials Research Proceedings, vol. 54, Materials Research Forum LLC, 2025, doi:10.21741/9781644903599-148.","short":"M.C. Schlichter, Ö. Harabati, J.-P. Ludwig, M. Böhnke, C.R. Bielak, M. Bobbert, G. Meschut, in: Materials Research Proceedings, Materials Research Forum LLC, 2025."},"quality_controlled":"1","publication_identifier":{"issn":["2474-395X"]},"publication_status":"published"},{"publication":"Materials Research Proceedings","type":"conference","abstract":[{"lang":"eng","text":"The versatile self-pierce riveting (V-SPR) is a further development of semi-tubular self-pierce riveting. V-SPR enables adaptation to changing boundary conditions, such as a change in the material thickness combination, without varying the rivet die combination due to increased punch actuation and the use of multi-range capable rivets [1]. The inner punch first sets the rivet. The outer punch then forms the rivet head to the respective sheet thickness. For this, the rivet requires a hard shank and a ductile rivet head, which is achieved by an inductive local hardening process [2]. Until now, the joint formation of rivets with graded hardness profile has been challenging to estimate in the FEM simulation due to the inhomogeneous material conditions in the rivet. In this study, a method capable of reproducing the experimentally determined hardness levels of rivets in detail is shown. This FE model enables the realistic modelling of the mechanical properties of the rivet on the basis of the hardness profile in order to predict the correct deformation processes and stresses during the riveting process. First, the detailed experimental hardness mapping of the locally heat-treated rivets is transferred into the FE model. The FEM material model can predict the local strength of the rivet based on hardness by scaling the flow curves. To estimate the predictive capability of the FEM model, the joint formation of rivets with different graded hardness profiles is compared experimentally and simulative. Based on the validated model, the influence of different rivet hardness profiles on the joint formation is analysed numerically. By adapting the material model, a high level of correlation between the experiment's joint formation and the simulation can be achieved."}],"status":"public","_id":"60440","project":[{"name":"TRR 285: TRR 285: Methodenentwicklung zur mechanischen Fügbarkeit in wandlungsfähigen Prozessketten","_id":"130"},{"name":"TRR 285 - C: TRR 285 - Project Area C","_id":"133"},{"name":"TRR 285 – C02: TRR 285 - Subproject C02","_id":"146"},{"_id":"131","name":"TRR 285 - A: TRR 285 - Project Area A"},{"_id":"135","name":"TRR 285 – A01: TRR 285 - Subproject A01"}],"department":[{"_id":"43"},{"_id":"157"}],"user_id":"7850","language":[{"iso":"eng"}],"publication_identifier":{"issn":["2474-395X"]},"quality_controlled":"1","publication_status":"published","year":"2025","intvolume":" 54","citation":{"apa":"Holtkamp, P. K., Bielak, C. R., Bobbert, M., & Meschut, G. (2025). Simulation of the joining process of graded hardened multi-range capable rivets. Materials Research Proceedings, 54. https://doi.org/10.21741/9781644903599-153","short":"P.K. Holtkamp, C.R. Bielak, M. Bobbert, G. Meschut, in: Materials Research Proceedings, Materials Research Forum LLC, 2025.","bibtex":"@inproceedings{Holtkamp_Bielak_Bobbert_Meschut_2025, title={Simulation of the joining process of graded hardened multi-range capable rivets}, volume={54}, DOI={10.21741/9781644903599-153}, booktitle={Materials Research Proceedings}, publisher={Materials Research Forum LLC}, author={Holtkamp, Pia Katharina and Bielak, Christian Roman and Bobbert, Mathias and Meschut, Gerson}, year={2025} }","mla":"Holtkamp, Pia Katharina, et al. “Simulation of the Joining Process of Graded Hardened Multi-Range Capable Rivets.” Materials Research Proceedings, vol. 54, Materials Research Forum LLC, 2025, doi:10.21741/9781644903599-153.","ama":"Holtkamp PK, Bielak CR, Bobbert M, Meschut G. Simulation of the joining process of graded hardened multi-range capable rivets. In: Materials Research Proceedings. Vol 54. Materials Research Forum LLC; 2025. doi:10.21741/9781644903599-153","chicago":"Holtkamp, Pia Katharina, Christian Roman Bielak, Mathias Bobbert, and Gerson Meschut. “Simulation of the Joining Process of Graded Hardened Multi-Range Capable Rivets.” In Materials Research Proceedings, Vol. 54. Materials Research Forum LLC, 2025. https://doi.org/10.21741/9781644903599-153.","ieee":"P. K. Holtkamp, C. R. Bielak, M. Bobbert, and G. Meschut, “Simulation of the joining process of graded hardened multi-range capable rivets,” in Materials Research Proceedings, 2025, vol. 54, doi: 10.21741/9781644903599-153."},"publisher":"Materials Research Forum LLC","date_updated":"2026-02-24T14:12:10Z","volume":54,"date_created":"2025-06-27T08:23:00Z","author":[{"id":"44935","full_name":"Holtkamp, Pia Katharina","last_name":"Holtkamp","first_name":"Pia Katharina"},{"full_name":"Bielak, Christian Roman","id":"34782","last_name":"Bielak","first_name":"Christian Roman"},{"last_name":"Bobbert","id":"7850","full_name":"Bobbert, Mathias","first_name":"Mathias"},{"last_name":"Meschut","orcid":"0000-0002-2763-1246","full_name":"Meschut, Gerson","id":"32056","first_name":"Gerson"}],"title":"Simulation of the joining process of graded hardened multi-range capable rivets","doi":"10.21741/9781644903599-153"},{"date_updated":"2026-02-24T15:13:52Z","publisher":"Springer Science and Business Media LLC","date_created":"2025-10-09T08:27:41Z","author":[{"first_name":"Daniel","id":"83408","full_name":"Köhler, Daniel","last_name":"Köhler"},{"last_name":"Dargel","id":"114764","full_name":"Dargel, Alrik","first_name":"Alrik"},{"full_name":"Troschitz, Juliane","last_name":"Troschitz","first_name":"Juliane"},{"first_name":"Maik","last_name":"Gude","full_name":"Gude, Maik"},{"first_name":"Robert","full_name":"Kupfer, Robert","last_name":"Kupfer"}],"volume":44,"title":"In Situ CT of Clinch Points – Enhancing Interface Detectability Using Electroplated Patterns of Radiopaque Materials","doi":"10.1007/s10921-025-01270-1","publication_status":"published","publication_identifier":{"issn":["0195-9298","1573-4862"]},"issue":"4","year":"2025","citation":{"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","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).","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."},"intvolume":" 44","project":[{"name":"TRR 285 - Project Area C","_id":"133"},{"name":"TRR 285: Methodenentwicklung zur mechanischen Fügbarkeit in wandlungsfähigen Prozessketten","_id":"130"},{"name":"TRR 285 - Subproject C04","_id":"148"}],"_id":"61767","user_id":"114764","article_type":"original","article_number":"131","language":[{"iso":"eng"}],"type":"journal_article","publication":"Journal of Nondestructive Evaluation","abstract":[{"lang":"eng","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."}],"status":"public"},{"abstract":[{"lang":"eng","text":" This study investigates the effect of dispersion gas (DG) flow on the formation and properties of maghemite (γ-Fe2O3) nanoparticles using standardized SpraySyn burners (SS1 and SS2). Several diagnostics were employed to characterize the spray and nanoparticles. \r\nIncreasing DG flow (6 - 12 slm) results in smaller droplet sizes (DS), cooler flame temperatures, shorter high-temperature droplet/particle residence times, and smaller agglomerates in the size range of 5 - 12 nm with narrower primary particle size distribution, corresponding to higher mass fractal dimensions, as supported by TEM and SMPS analysis, resulting in more compact agglomerates. BET and TEM confirmed decreasing primary particle sizes with increasing DG flow. Raman and XRD analyses predominantly identified maghemite, which shows a bimodal distribution of crystallite sizes, while SS1 samples have a greater proportion of larger crystallites.\r\nThe self-preserving size distributions of agglomerates with a geometric standard deviation of 1.5 are reached faster with increasing DG flow. The barrier effect of DG observed in SS1 leads to slower droplet combustion kinetics, higher temperatures, and delayed precursor release, which, along with downstream flow recirculation, result in significantly higher agglomeration rates outside the visible flame. SS2 demonstrates improved atomization, more stable flames, and finer, uniform nanoparticles with less carbonaceous residues (CR). Conversely, SS1 showed broader DS distributions and higher CR levels on the γ-Fe2O3 surface, especially at higher DG flow.\r\nThis work highlights the essential role of DG flow and nozzle geometry in controlling droplet evaporation, flame stability, and nanoparticle growth, offering insights for optimizing SFS and validating numerical models.\r\n"}],"publication":"Powder Technology","language":[{"iso":"eng"}],"keyword":["Spray flame synthesis","iron oxide nanoparticle","SpraySyn burner","Dispersion gas","Coaxial atomization","HiaT-SMPS"],"year":"2025","title":"Influence of dispersion gas flow on the spray characteristics and γ-Fe2O3 nanoparticles formation and properties in reference SpraySyn burners","date_created":"2026-02-02T11:41:04Z","publisher":"Elsevier BV","status":"public","type":"journal_article","article_number":"121992","article_type":"original","user_id":"98419","_id":"63830","citation":{"ieee":"O. Massopo et al., “Influence of dispersion gas flow on the spray characteristics and γ-Fe2O3 nanoparticles formation and properties in reference SpraySyn burners,” Powder Technology, vol. 470, Art. no. 121992, 2025, doi: 10.1016/j.powtec.2025.121992.","chicago":"Massopo, Orlando, Ricardo Tischendorf, Munko Gonchikzhapov, Tina Kasper, Peter Augustin, Burak Özer, Manuel Reddemann, et al. “Influence of Dispersion Gas Flow on the Spray Characteristics and γ-Fe2O3 Nanoparticles Formation and Properties in Reference SpraySyn Burners.” Powder Technology 470 (2025). https://doi.org/10.1016/j.powtec.2025.121992.","ama":"Massopo O, Tischendorf R, Gonchikzhapov M, et al. Influence of dispersion gas flow on the spray characteristics and γ-Fe2O3 nanoparticles formation and properties in reference SpraySyn burners. Powder Technology. 2025;470. doi:10.1016/j.powtec.2025.121992","short":"O. Massopo, R. Tischendorf, M. Gonchikzhapov, T. Kasper, P. Augustin, B. Özer, M. Reddemann, R. Kneer, M.-A. Sheikh, A.A. Mert, H. Wiggers, H.-J. Schmid, Powder Technology 470 (2025).","mla":"Massopo, Orlando, et al. “Influence of Dispersion Gas Flow on the Spray Characteristics and γ-Fe2O3 Nanoparticles Formation and Properties in Reference SpraySyn Burners.” Powder Technology, vol. 470, 121992, Elsevier BV, 2025, doi:10.1016/j.powtec.2025.121992.","bibtex":"@article{Massopo_Tischendorf_Gonchikzhapov_Kasper_Augustin_Özer_Reddemann_Kneer_Sheikh_Mert_et al._2025, title={Influence of dispersion gas flow on the spray characteristics and γ-Fe2O3 nanoparticles formation and properties in reference SpraySyn burners}, volume={470}, DOI={10.1016/j.powtec.2025.121992}, number={121992}, journal={Powder Technology}, publisher={Elsevier BV}, author={Massopo, Orlando and Tischendorf, Ricardo and Gonchikzhapov, Munko and Kasper, Tina and Augustin, Peter and Özer, Burak and Reddemann, Manuel and Kneer, Reinhold and Sheikh, Mohammed-Ali and Mert, Aydan Akyildiz and et al.}, year={2025} }","apa":"Massopo, O., Tischendorf, R., Gonchikzhapov, M., Kasper, T., Augustin, P., Özer, B., Reddemann, M., Kneer, R., Sheikh, M.-A., Mert, A. A., Wiggers, H., & Schmid, H.-J. (2025). Influence of dispersion gas flow on the spray characteristics and γ-Fe2O3 nanoparticles formation and properties in reference SpraySyn burners. Powder Technology, 470, Article 121992. https://doi.org/10.1016/j.powtec.2025.121992"},"intvolume":" 470","publication_status":"published","publication_identifier":{"issn":["0032-5910"]},"main_file_link":[{"open_access":"1"}],"doi":"10.1016/j.powtec.2025.121992","author":[{"full_name":"Massopo, Orlando","last_name":"Massopo","first_name":"Orlando"},{"first_name":"Ricardo","full_name":"Tischendorf, Ricardo","last_name":"Tischendorf"},{"full_name":"Gonchikzhapov, Munko","last_name":"Gonchikzhapov","first_name":"Munko"},{"full_name":"Kasper, Tina","last_name":"Kasper","first_name":"Tina"},{"last_name":"Augustin","full_name":"Augustin, Peter","first_name":"Peter"},{"full_name":"Özer, Burak","last_name":"Özer","first_name":"Burak"},{"full_name":"Reddemann, Manuel","last_name":"Reddemann","first_name":"Manuel"},{"last_name":"Kneer","full_name":"Kneer, Reinhold","first_name":"Reinhold"},{"first_name":"Mohammed-Ali","last_name":"Sheikh","full_name":"Sheikh, Mohammed-Ali"},{"first_name":"Aydan Akyildiz","full_name":"Mert, Aydan Akyildiz","last_name":"Mert"},{"first_name":"Hartmut","last_name":"Wiggers","full_name":"Wiggers, Hartmut"},{"first_name":"Hans-Joachim","full_name":"Schmid, Hans-Joachim","last_name":"Schmid"}],"volume":470,"oa":"1","date_updated":"2026-02-25T07:45:44Z"},{"publication":"Des. Codes Cryptogr.","type":"journal_article","abstract":[{"text":"A finite classical polar space of rank $n$ consists of the totally isotropic\r\nsubspaces of a finite vector space over $\\mathbb{F}_q$ equipped with a\r\nnondegenerate form such that $n$ is the maximal dimension of such a subspace. A\r\n$t$-$(n,k,\\lambda)$ design in a finite classical polar space of rank $n$ is a\r\ncollection $Y$ of totally isotropic $k$-spaces such that each totally isotropic\r\n$t$-space is contained in exactly $\\lambda$ members of $Y$. Nontrivial examples\r\nare currently only known for $t\\leq 2$. We show that $t$-$(n,k,\\lambda)$\r\ndesigns in polar spaces exist for all $t$ and $q$ provided that\r\n$k>\\frac{21}{2}t$ and $n$ is sufficiently large enough. The proof is based on a\r\nprobabilistic method by Kuperberg, Lovett, and Peled, and it is thus\r\nnonconstructive.","lang":"eng"}],"status":"public","_id":"50299","department":[{"_id":"100"}],"user_id":"70420","language":[{"iso":"eng"}],"publication_status":"published","year":"2025","intvolume":" 93","page":"971 - 981","citation":{"apa":"Weiß, C. (2025). Nontrivial $t$-designs in polar spaces exist for all $t$. Des. Codes Cryptogr., 93, 971–981. https://doi.org/10.1007/s10623-024-01471-1","short":"C. Weiß, Des. Codes Cryptogr. 93 (2025) 971–981.","bibtex":"@article{Weiß_2025, title={Nontrivial $t$-designs in polar spaces exist for all $t$}, volume={93}, DOI={10.1007/s10623-024-01471-1}, journal={Des. Codes Cryptogr.}, author={Weiß, Charlene}, year={2025}, pages={971–981} }","mla":"Weiß, Charlene. “Nontrivial $t$-Designs in Polar Spaces Exist for All $t$.” Des. Codes Cryptogr., vol. 93, 2025, pp. 971–81, doi:10.1007/s10623-024-01471-1.","chicago":"Weiß, Charlene. “Nontrivial $t$-Designs in Polar Spaces Exist for All $t$.” Des. Codes Cryptogr. 93 (2025): 971–81. https://doi.org/10.1007/s10623-024-01471-1.","ieee":"C. Weiß, “Nontrivial $t$-designs in polar spaces exist for all $t$,” Des. Codes Cryptogr., vol. 93, pp. 971–981, 2025, doi: 10.1007/s10623-024-01471-1.","ama":"Weiß C. Nontrivial $t$-designs in polar spaces exist for all $t$. Des Codes Cryptogr. 2025;93:971-981. doi:10.1007/s10623-024-01471-1"},"date_updated":"2026-02-25T13:51:50Z","volume":93,"date_created":"2024-01-08T14:39:54Z","author":[{"last_name":"Weiß","id":"70420","full_name":"Weiß, Charlene","first_name":"Charlene"}],"title":"Nontrivial $t$-designs in polar spaces exist for all $t$","doi":"10.1007/s10623-024-01471-1"},{"editor":[{"first_name":"G.","last_name":"Meschut","full_name":"Meschut, G."},{"full_name":"Bobbert, M.","last_name":"Bobbert","first_name":"M."},{"full_name":"Duflou, J.","last_name":"Duflou","first_name":"J."},{"first_name":"L.","full_name":"Fratini, L.","last_name":"Fratini"},{"first_name":"H.","full_name":"Hagenah, H.","last_name":"Hagenah"},{"full_name":"Martins, P.","last_name":"Martins","first_name":"P."},{"full_name":"Merklein, M.","last_name":"Merklein","first_name":"M."},{"full_name":"Micari, F.","last_name":"Micari","first_name":"F."}],"status":"public","type":"conference","_id":"62079","project":[{"_id":"130","name":"TRR 285: Methodenentwicklung zur mechanischen Fügbarkeit in wandlungsfähigen Prozessketten"},{"_id":"137","name":"TRR 285 - Subproject A03"},{"_id":"131","name":"TRR 285 - Project Area A"}],"user_id":"105344","series_title":"Materials Research Proceedings","page":"268–275","citation":{"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","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.","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} }","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.","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.","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"},"publication_identifier":{"isbn":["978-1-64490-354-4"]},"doi":"10.21741/9781644903551-33","date_updated":"2026-02-27T06:43:19Z","author":[{"first_name":"Benjamin","last_name":"Gröger","full_name":"Gröger, Benjamin"},{"id":"105344","full_name":"Gerritzen, Johannes","last_name":"Gerritzen","orcid":"0000-0002-0169-8602","first_name":"Johannes"},{"full_name":"Hornig, Andreas","last_name":"Hornig","first_name":"Andreas"},{"first_name":"Maik","last_name":"Gude","full_name":"Gude, Maik"}],"abstract":[{"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.","lang":"eng"}],"publication":"Sheet Metal 2025","keyword":["Finite Element Method (FEM)","Process","Thermoplastic Fiber Reinforced Plastic"],"language":[{"iso":"eng"}],"year":"2025","title":"Modeling approaches for the decomposition behavior of preconsolidated rovings throughout local deformation processes","publisher":"Materials Research Forum LLC, Materials Research Foundations","date_created":"2025-11-04T12:48:21Z"}]