[{"date_created":"2025-11-14T10:52:10Z","title":"„Und ich sag mal, Theorie und Praxis ist zweierlei“. Wie können Praxisphasen Lehramtsstudierende auf zukünftige Anforderungen vorbereiten? ","year":"2025","ddc":["370"],"language":[{"iso":"ger"}],"publication":"Zukünfte technischer Bildung","file":[{"file_size":9953811,"access_level":"closed","file_name":"dgtb26.pdf","file_id":"62273","date_updated":"2025-11-21T08:30:09Z","creator":"maver001","date_created":"2025-11-21T08:30:09Z","success":1,"relation":"main_file","content_type":"application/pdf"}],"date_updated":"2026-02-17T07:52:34Z","oa":"1","volume":26,"author":[{"first_name":"Mats","id":"76955","full_name":"Vernholz, Mats","orcid":"0000-0001-5175-357X","last_name":"Vernholz"},{"first_name":"Gabriela","full_name":"Jonas-Ahrend, Gabriela","id":"77633","orcid":"0000-0003-3898-954X","last_name":"Jonas-Ahrend"},{"first_name":"Katrin","full_name":"Temmen, Katrin","id":"30086","last_name":"Temmen"}],"doi":"https://doi.org/10.25932/publishup-67926","conference":{"location":"Halle/Saale","end_date":"2024-09-20","start_date":"2024-09-18","name":"Deutsche Gesellschaft für Technische Bildung (DGTB)"},"main_file_link":[{"open_access":"1"}],"has_accepted_license":"1","publication_status":"published","place":"Universitätsverlag Potsdam","intvolume":"        26","citation":{"ieee":"M. Vernholz, G. Jonas-Ahrend, and K. Temmen, “„Und ich sag mal, Theorie und Praxis ist zweierlei“. Wie können Praxisphasen Lehramtsstudierende auf zukünftige Anforderungen vorbereiten? ,” in <i>Zukünfte technischer Bildung</i>, vol. 26, T. Wiemer, M. Binder, and I. Penning, Eds. Universitätsverlag Potsdam, 2025.","chicago":"Vernholz, Mats, Gabriela Jonas-Ahrend, and Katrin Temmen. “„Und ich sag mal, Theorie und Praxis ist zweierlei“. Wie können Praxisphasen Lehramtsstudierende auf zukünftige Anforderungen vorbereiten? .” In <i>Zukünfte technischer Bildung</i>, edited by Tobias Wiemer, Martin Binder, and Isabelle Penning, Vol. 26. Jahrestagungen der Deutschen Gesellschaft für Technische Bildung e.V. . Universitätsverlag Potsdam, 2025. <a href=\"https://doi.org/10.25932/publishup-67926\">https://doi.org/10.25932/publishup-67926</a>.","ama":"Vernholz M, Jonas-Ahrend G, Temmen K. „Und ich sag mal, Theorie und Praxis ist zweierlei“. Wie können Praxisphasen Lehramtsstudierende auf zukünftige Anforderungen vorbereiten? . In: Wiemer T, Binder M, Penning I, eds. <i>Zukünfte technischer Bildung</i>. Vol 26. Jahrestagungen der Deutschen Gesellschaft für Technische Bildung e.V. . ; 2025. doi:<a href=\"https://doi.org/10.25932/publishup-67926\">https://doi.org/10.25932/publishup-67926</a>","apa":"Vernholz, M., Jonas-Ahrend, G., &#38; Temmen, K. (2025). „Und ich sag mal, Theorie und Praxis ist zweierlei“. Wie können Praxisphasen Lehramtsstudierende auf zukünftige Anforderungen vorbereiten? . In T. Wiemer, M. Binder, &#38; I. Penning (Eds.), <i>Zukünfte technischer Bildung</i> (Vol. 26). <a href=\"https://doi.org/10.25932/publishup-67926\">https://doi.org/10.25932/publishup-67926</a>","short":"M. Vernholz, G. Jonas-Ahrend, K. Temmen, in: T. Wiemer, M. Binder, I. Penning (Eds.), Zukünfte technischer Bildung, Universitätsverlag Potsdam, 2025.","bibtex":"@inbook{Vernholz_Jonas-Ahrend_Temmen_2025, place={Universitätsverlag Potsdam}, series={Jahrestagungen der Deutschen Gesellschaft für Technische Bildung e.V. }, title={„Und ich sag mal, Theorie und Praxis ist zweierlei“. Wie können Praxisphasen Lehramtsstudierende auf zukünftige Anforderungen vorbereiten? }, volume={26}, DOI={<a href=\"https://doi.org/10.25932/publishup-67926\">https://doi.org/10.25932/publishup-67926</a>}, booktitle={Zukünfte technischer Bildung}, author={Vernholz, Mats and Jonas-Ahrend, Gabriela and Temmen, Katrin}, editor={Wiemer, Tobias and Binder, Martin and Penning, Isabelle}, year={2025}, collection={Jahrestagungen der Deutschen Gesellschaft für Technische Bildung e.V. } }","mla":"Vernholz, Mats, et al. “„Und ich sag mal, Theorie und Praxis ist zweierlei“. Wie können Praxisphasen Lehramtsstudierende auf zukünftige Anforderungen vorbereiten? .” <i>Zukünfte technischer Bildung</i>, edited by Tobias Wiemer et al., vol. 26, 2025, doi:<a href=\"https://doi.org/10.25932/publishup-67926\">https://doi.org/10.25932/publishup-67926</a>."},"_id":"62188","department":[{"_id":"300"}],"user_id":"76955","series_title":"Jahrestagungen der Deutschen Gesellschaft für Technische Bildung e.V. ","file_date_updated":"2025-11-21T08:30:09Z","type":"book_chapter","editor":[{"first_name":"Tobias","last_name":"Wiemer","full_name":"Wiemer, Tobias"},{"first_name":"Martin","last_name":"Binder","full_name":"Binder, Martin"},{"first_name":"Isabelle","last_name":"Penning","full_name":"Penning, Isabelle"}],"status":"public"},{"language":[{"iso":"eng"}],"department":[{"_id":"520"}],"user_id":"14972","_id":"61121","status":"public","publication":"zbMATH Open, Zbl. 08058231","type":"review","main_file_link":[{"url":"https://zbmath.org/8058231","open_access":"1"}],"title":"Franke-Reddig, Julia, „Bernard Bolzano im Kontext der Logikgeschichtsschreibung von Heinrich Scholz“, SieB. Siegener Beiträge zur Geschichte und Philosophie der Mathematik 18 (2024), 155–175","author":[{"last_name":"Peckhaus","id":"391","full_name":"Peckhaus, Volker","first_name":"Volker"}],"date_created":"2025-09-03T13:56:07Z","date_updated":"2026-02-19T10:10:27Z","oa":"1","citation":{"mla":"Peckhaus, Volker. “Franke-Reddig, Julia, „Bernard Bolzano Im Kontext Der Logikgeschichtsschreibung von Heinrich Scholz“, SieB. Siegener Beiträge Zur Geschichte Und Philosophie Der Mathematik 18 (2024), 155–175.” <i>ZbMATH Open, Zbl. 08058231</i>, 2025.","bibtex":"@article{Peckhaus_2025, title={Franke-Reddig, Julia, „Bernard Bolzano im Kontext der Logikgeschichtsschreibung von Heinrich Scholz“, SieB. Siegener Beiträge zur Geschichte und Philosophie der Mathematik 18 (2024), 155–175}, journal={zbMATH Open, Zbl. 08058231}, author={Peckhaus, Volker}, year={2025} }","short":"V. Peckhaus, ZbMATH Open, Zbl. 08058231 (2025).","apa":"Peckhaus, V. (2025). Franke-Reddig, Julia, „Bernard Bolzano im Kontext der Logikgeschichtsschreibung von Heinrich Scholz“, SieB. Siegener Beiträge zur Geschichte und Philosophie der Mathematik 18 (2024), 155–175. In <i>zbMATH Open, Zbl. 08058231</i>.","chicago":"Peckhaus, Volker. “Franke-Reddig, Julia, „Bernard Bolzano Im Kontext Der Logikgeschichtsschreibung von Heinrich Scholz“, SieB. Siegener Beiträge Zur Geschichte Und Philosophie Der Mathematik 18 (2024), 155–175.” <i>ZbMATH Open, Zbl. 08058231</i>, 2025.","ieee":"V. Peckhaus, “Franke-Reddig, Julia, „Bernard Bolzano im Kontext der Logikgeschichtsschreibung von Heinrich Scholz“, SieB. Siegener Beiträge zur Geschichte und Philosophie der Mathematik 18 (2024), 155–175,” <i>zbMATH Open, Zbl. 08058231</i>. 2025.","ama":"Peckhaus V. Franke-Reddig, Julia, „Bernard Bolzano im Kontext der Logikgeschichtsschreibung von Heinrich Scholz“, SieB. Siegener Beiträge zur Geschichte und Philosophie der Mathematik 18 (2024), 155–175. <i>zbMATH Open, Zbl 08058231</i>. Published online 2025."},"year":"2025"},{"type":"journal_article","status":"public","_id":"63181","department":[{"_id":"121"}],"user_id":"90339","file_date_updated":"2025-12-17T09:10:18Z","publication_identifier":{"issn":["1362-0436","1758-6003"]},"has_accepted_license":"1","publication_status":"published","page":"1-19","citation":{"apa":"Neufeld, K., Ohly, S., Sedefoglu-Ulucak, D., Steinhardt, I., &#38; Mauermeister, S. (2025). Analyzing the role of family socio-economic status, education and work characteristics in times of generative artificial intelligence and digital divide. <i>Career Development International</i>, 1–19. <a href=\"https://doi.org/10.1108/cdi-10-2024-0442\">https://doi.org/10.1108/cdi-10-2024-0442</a>","bibtex":"@article{Neufeld_Ohly_Sedefoglu-Ulucak_Steinhardt_Mauermeister_2025, title={Analyzing the role of family socio-economic status, education and work characteristics in times of generative artificial intelligence and digital divide}, DOI={<a href=\"https://doi.org/10.1108/cdi-10-2024-0442\">10.1108/cdi-10-2024-0442</a>}, journal={Career Development International}, publisher={Emerald}, author={Neufeld, Katharina and Ohly, Sandra and Sedefoglu-Ulucak, Didem and Steinhardt, Isabel and Mauermeister, Sylvi}, year={2025}, pages={1–19} }","mla":"Neufeld, Katharina, et al. “Analyzing the Role of Family Socio-Economic Status, Education and Work Characteristics in Times of Generative Artificial Intelligence and Digital Divide.” <i>Career Development International</i>, Emerald, 2025, pp. 1–19, doi:<a href=\"https://doi.org/10.1108/cdi-10-2024-0442\">10.1108/cdi-10-2024-0442</a>.","short":"K. Neufeld, S. Ohly, D. Sedefoglu-Ulucak, I. Steinhardt, S. Mauermeister, Career Development International (2025) 1–19.","ama":"Neufeld K, Ohly S, Sedefoglu-Ulucak D, Steinhardt I, Mauermeister S. Analyzing the role of family socio-economic status, education and work characteristics in times of generative artificial intelligence and digital divide. <i>Career Development International</i>. Published online 2025:1-19. doi:<a href=\"https://doi.org/10.1108/cdi-10-2024-0442\">10.1108/cdi-10-2024-0442</a>","chicago":"Neufeld, Katharina, Sandra Ohly, Didem Sedefoglu-Ulucak, Isabel Steinhardt, and Sylvi Mauermeister. “Analyzing the Role of Family Socio-Economic Status, Education and Work Characteristics in Times of Generative Artificial Intelligence and Digital Divide.” <i>Career Development International</i>, 2025, 1–19. <a href=\"https://doi.org/10.1108/cdi-10-2024-0442\">https://doi.org/10.1108/cdi-10-2024-0442</a>.","ieee":"K. Neufeld, S. Ohly, D. Sedefoglu-Ulucak, I. Steinhardt, and S. Mauermeister, “Analyzing the role of family socio-economic status, education and work characteristics in times of generative artificial intelligence and digital divide,” <i>Career Development International</i>, pp. 1–19, 2025, doi: <a href=\"https://doi.org/10.1108/cdi-10-2024-0442\">10.1108/cdi-10-2024-0442</a>."},"date_updated":"2026-02-20T11:21:28Z","oa":"1","author":[{"full_name":"Neufeld, Katharina","last_name":"Neufeld","first_name":"Katharina"},{"first_name":"Sandra","last_name":"Ohly","full_name":"Ohly, Sandra"},{"first_name":"Didem","last_name":"Sedefoglu-Ulucak","full_name":"Sedefoglu-Ulucak, Didem"},{"first_name":"Isabel","id":"90339","full_name":"Steinhardt, Isabel","orcid":"https://orcid.org/0000-0002-2590-6189","last_name":"Steinhardt"},{"last_name":"Mauermeister","full_name":"Mauermeister, Sylvi","id":"98032","first_name":"Sylvi"}],"doi":"10.1108/cdi-10-2024-0442","main_file_link":[{"url":"https://www.emerald.com/cdi/article/doi/10.1108/CDI-10-2024-0442/1310335","open_access":"1"}],"publication":"Career Development International","abstract":[{"lang":"eng","text":"<jats:sec>\r\n                    <jats:title>Purpose</jats:title>\r\n                    <jats:p>This study aims to explore the current state of generative artificial intelligence (genAI) in the workplace and discuss a potential digital divide in relation to genAI.</jats:p>\r\n                  </jats:sec>\r\n                  <jats:sec>\r\n                    <jats:title>Design/methodology/approach</jats:title>\r\n                    <jats:p>Using a quantitative approach, we study career-relevant predictors – family socio-economic status, education and work characteristics – and their relationship with different indicators of digital divide – access, genAI use, attitude toward AI and perceived AI literacy. To test our hypothesis, we used logistic and linear regression analyses. Additionally, latent profile analysis was conducted to identify patterns regarding work characteristics within the sample.</jats:p>\r\n                  </jats:sec>\r\n                  <jats:sec>\r\n                    <jats:title>Findings</jats:title>\r\n                    <jats:p>Among the 1,341 participants, 326 individuals were genAI users. Our results show that higher family socio-economic status, education and enriched and demanding work can be linked to a more positive attitude toward AI and higher perceived AI literacy. In the case of access and frequency of use, the results were mixed.</jats:p>\r\n                  </jats:sec>\r\n                  <jats:sec>\r\n                    <jats:title>Originality/value</jats:title>\r\n                    <jats:p>Our findings offer a novel contribution by examining a potentially upcoming digital divide in the case of genAI. We focus on how the career adaptation of the workforce might develop in the age of genAI. Importantly, we highlight that not all individuals may have an equal opportunity to adapt to genAI, which could hinder their future career development and reinforce patterns of inequality. Future research should address how to promote inclusivity and consider individual differences in adapting to genAI.</jats:p>\r\n                  </jats:sec>"}],"file":[{"access_level":"closed","file_name":"2025 Neufeld et al. DD Family Career.pdf","file_id":"63182","file_size":718834,"date_created":"2025-12-17T09:10:18Z","creator":"isste","date_updated":"2025-12-17T09:10:18Z","relation":"main_file","success":1,"content_type":"application/pdf"}],"ddc":["300"],"language":[{"iso":"eng"}],"quality_controlled":"1","year":"2025","publisher":"Emerald","date_created":"2025-12-17T09:07:27Z","title":"Analyzing the role of family socio-economic status, education and work characteristics in times of generative artificial intelligence and digital divide"},{"publication_status":"published","quality_controlled":"1","publication_identifier":{"issn":["0021-8464","1545-5823"]},"year":"2025","citation":{"bibtex":"@article{Wu_Delp_Freund_Walther_Haubrich_Löbbecke_Tröster_2025, title={Correlation between interlaminar shear strength of CFRP and joint strength of aluminium-CFRP hybrid joints}, DOI={<a href=\"https://doi.org/10.1080/00218464.2024.2439956\">10.1080/00218464.2024.2439956</a>}, journal={The Journal of Adhesion}, publisher={Informa UK Limited}, author={Wu, Shuang and Delp, Alexander and Freund, Jonathan and Walther, Frank and Haubrich, Jan and Löbbecke, Miriam and Tröster, Thomas}, year={2025}, pages={1–26} }","mla":"Wu, Shuang, et al. “Correlation between Interlaminar Shear Strength of CFRP and Joint Strength of Aluminium-CFRP Hybrid Joints.” <i>The Journal of Adhesion</i>, Informa UK Limited, 2025, pp. 1–26, doi:<a href=\"https://doi.org/10.1080/00218464.2024.2439956\">10.1080/00218464.2024.2439956</a>.","short":"S. Wu, A. Delp, J. Freund, F. Walther, J. Haubrich, M. Löbbecke, T. Tröster, The Journal of Adhesion (2025) 1–26.","apa":"Wu, S., Delp, A., Freund, J., Walther, F., Haubrich, J., Löbbecke, M., &#38; Tröster, T. (2025). Correlation between interlaminar shear strength of CFRP and joint strength of aluminium-CFRP hybrid joints. <i>The Journal of Adhesion</i>, 1–26. <a href=\"https://doi.org/10.1080/00218464.2024.2439956\">https://doi.org/10.1080/00218464.2024.2439956</a>","ama":"Wu S, Delp A, Freund J, et al. Correlation between interlaminar shear strength of CFRP and joint strength of aluminium-CFRP hybrid joints. <i>The Journal of Adhesion</i>. Published online 2025:1-26. doi:<a href=\"https://doi.org/10.1080/00218464.2024.2439956\">10.1080/00218464.2024.2439956</a>","ieee":"S. Wu <i>et al.</i>, “Correlation between interlaminar shear strength of CFRP and joint strength of aluminium-CFRP hybrid joints,” <i>The Journal of Adhesion</i>, pp. 1–26, 2025, doi: <a href=\"https://doi.org/10.1080/00218464.2024.2439956\">10.1080/00218464.2024.2439956</a>.","chicago":"Wu, Shuang, Alexander Delp, Jonathan Freund, Frank Walther, Jan Haubrich, Miriam Löbbecke, and Thomas Tröster. “Correlation between Interlaminar Shear Strength of CFRP and Joint Strength of Aluminium-CFRP Hybrid Joints.” <i>The Journal of Adhesion</i>, 2025, 1–26. <a href=\"https://doi.org/10.1080/00218464.2024.2439956\">https://doi.org/10.1080/00218464.2024.2439956</a>."},"page":"1-26","publisher":"Informa UK Limited","date_updated":"2026-02-20T12:49:17Z","oa":"1","date_created":"2025-01-13T08:16:46Z","author":[{"id":"48039","full_name":"Wu, Shuang","orcid":"0000-0001-8645-9952","last_name":"Wu","first_name":"Shuang"},{"first_name":"Alexander","last_name":"Delp","full_name":"Delp, Alexander"},{"last_name":"Freund","full_name":"Freund, Jonathan","first_name":"Jonathan"},{"first_name":"Frank","full_name":"Walther, Frank","last_name":"Walther"},{"last_name":"Haubrich","full_name":"Haubrich, Jan","first_name":"Jan"},{"first_name":"Miriam","full_name":"Löbbecke, Miriam","last_name":"Löbbecke"},{"first_name":"Thomas","last_name":"Tröster","full_name":"Tröster, Thomas","id":"553"}],"title":"Correlation between interlaminar shear strength of CFRP and joint strength of aluminium-CFRP hybrid joints","main_file_link":[{"open_access":"1","url":"https://www.tandfonline.com/doi/full/10.1080/00218464.2024.2439956?src="}],"doi":"10.1080/00218464.2024.2439956","type":"journal_article","publication":"The Journal of Adhesion","abstract":[{"text":"Fibre-reinforced polymers are increasingly used due to their high specific strength, making them suitable for local sheet metal reinforcement. This allows improved overall mechanical properties with reduced wall thickness of the sheet metal part and, thus, lower weight of the components. One of the main focuses of research into such hybrid structures is on the adhesive properties and the respective failure behaviour of the interfaces. Generally, the failure behaviour under the influence of mechanical loads can be divided into adhesive, cohesive and mixed-mode failure. The correlation between observed failure behaviour and adhesion properties of the hybrid composite materials is analysed in detail in this work. The hybrid composite consists of an aluminium sheet of the alloy EN AW‑6082 T6 and thermoset carbon fibre-reinforced plastic (CFRP) prepreg. The aluminium sheet was laser pretreated before hybrid production to improve the adhesion properties. The specimens studied were produced by the prepreg pressing process, in which the components are cured and joined simultaneously. The influences of the thickness of the CFRP part, the layup, the fibre orientation at the boundary layer, and the laser pretreatment parameters on the properties of the hybrid joints were investigated.","lang":"eng"}],"status":"public","_id":"58163","user_id":"48039","department":[{"_id":"321"},{"_id":"149"},{"_id":"9"}],"article_type":"original","keyword":["Prepreg pressing process","hybrid joints","laser surface pretreatment","intrinsic manufacturing","CFRP","aluminium","materials engineering"],"language":[{"iso":"eng"}]},{"language":[{"iso":"eng"}],"publication":"Open Research Europe","abstract":[{"text":"This paper develops a new concept and framework for understanding resilient digital democracy in an age defined by polarisation, cascading crises, and the global rise of digital authoritarianism. It begins by tracing the concept of resilience from systems theory to social and political life, showing that resilience in democracy is not a mechanical property of systems but a dynamic, human-driven practice grounded in agency, resistance, and collective self-determination. The paper argues that with emerging challenges in the digital sphere, such as misinformation, surveillance capitalism, platform monopolies, deepfakes, and hybrid warfare, democracy can only endure if its digital dimensions are protected and transformed. Building on this foundation, the paper introduces a holistic approach to resilient digital democracy that spans environmental, technological, economic, political, and cultural domains, and advances strategies such as public-commons digital infrastructures, platform co-operatives, public service Internet platforms, free/libre open source software (FLOSS), participatory innovations, and hybrid offline/online democratic practices. The result is a fresh, interdisciplinary vision of how democracy can be reinvented in the digital age.","lang":"eng"}],"date_created":"2025-12-12T18:21:20Z","publisher":"F1000 Research Ltd","title":"What is and how do we Achieve a Resilient Digital Democracy?","quality_controlled":"1","year":"2025","department":[{"_id":"136"},{"_id":"11"}],"user_id":"21863","_id":"63076","project":[{"name":"INNOVAtive DEmocracy Through Digitalisation","_id":"1397"}],"article_type":"original","article_number":"387","type":"journal_article","status":"public","volume":5,"author":[{"first_name":"Christian","full_name":"Fuchs, Christian","id":"21863","orcid":"0000-0003-0589-4579","last_name":"Fuchs"}],"date_updated":"2026-02-23T20:51:40Z","oa":"1","doi":"10.12688/openreseurope.21988.2","main_file_link":[{"open_access":"1","url":"https://doi.org/10.12688/openreseurope.21988.2"}],"publication_identifier":{"issn":["2732-5121"]},"has_accepted_license":"1","publication_status":"published","intvolume":"         5","citation":{"bibtex":"@article{Fuchs_2025, title={What is and how do we Achieve a Resilient Digital Democracy?}, volume={5}, DOI={<a href=\"https://doi.org/10.12688/openreseurope.21988.2\">10.12688/openreseurope.21988.2</a>}, number={387}, journal={Open Research Europe}, publisher={F1000 Research Ltd}, author={Fuchs, Christian}, year={2025} }","mla":"Fuchs, Christian. “What Is and How Do We Achieve a Resilient Digital Democracy?” <i>Open Research Europe</i>, vol. 5, 387, F1000 Research Ltd, 2025, doi:<a href=\"https://doi.org/10.12688/openreseurope.21988.2\">10.12688/openreseurope.21988.2</a>.","short":"C. Fuchs, Open Research Europe 5 (2025).","ama":"Fuchs C. What is and how do we Achieve a Resilient Digital Democracy? <i>Open Research Europe</i>. 2025;5. doi:<a href=\"https://doi.org/10.12688/openreseurope.21988.2\">10.12688/openreseurope.21988.2</a>","apa":"Fuchs, C. (2025). What is and how do we Achieve a Resilient Digital Democracy? <i>Open Research Europe</i>, <i>5</i>, Article 387. <a href=\"https://doi.org/10.12688/openreseurope.21988.2\">https://doi.org/10.12688/openreseurope.21988.2</a>","ieee":"C. Fuchs, “What is and how do we Achieve a Resilient Digital Democracy?,” <i>Open Research Europe</i>, vol. 5, Art. no. 387, 2025, doi: <a href=\"https://doi.org/10.12688/openreseurope.21988.2\">10.12688/openreseurope.21988.2</a>.","chicago":"Fuchs, Christian. “What Is and How Do We Achieve a Resilient Digital Democracy?” <i>Open Research Europe</i> 5 (2025). <a href=\"https://doi.org/10.12688/openreseurope.21988.2\">https://doi.org/10.12688/openreseurope.21988.2</a>."}},{"date_created":"2025-05-12T15:21:06Z","title":"Mechanical joinability of microstructurally graded structural components manufactured from hypoeutectic aluminium casting alloys","quality_controlled":"1","year":"2025","keyword":["Joining","Casting","Self-pierce riveting","Aluminium casting alloy"],"language":[{"iso":"eng"}],"publication":"44th Conference of the International Deep Drawing Research Group (IDDRG 2025)","abstract":[{"lang":"eng","text":"Lightweight design is a driving concept in modern automotive engineering to minimize resource consumption over a vehicle's lifecycle through multi-material design, which relies on the use of joining techniques in car body fabrication. Multi-material design and the increasing trend towards producing large structural components using the megacasting process pose considerable challenges, particularly in the mechanical joining of aluminium-silicon (AlSi) castings. These castings typically exhibit low ductility and are prone to cracking when mechanically joined. Based on the excellent castability of hypoeutectic AlSi alloys, these are applied in sand casting and die casting as well as in megacasting. With a silicon content between 7 wt% and 12 wt%, these AlSi-alloys have a plate-like silicon phase that initiates cracks during mechanical joining. To enhance the joinability of castings, the research hypothesis is that improved solidification conditions enable a significant modification in the microstructure and therefore, increase the mechanical properties. During the manufacture of the castings using the sand casting process, the solidification conditions within the structural elements are varied to modify the microstructure to obtain castings with graded microstructure. The castings are evaluated using mechanical, microstructural and joining testing methods and finally, a microstructure-joinability correlation is established."}],"oa":"1","date_updated":"2026-02-24T13:41:58Z","author":[{"first_name":"Moritz","last_name":"Neuser","full_name":"Neuser, Moritz","id":"32340"},{"first_name":"Malte Christian","full_name":"Schlichter, Malte Christian","id":"61977","last_name":"Schlichter"},{"full_name":"Hoyer, Kay-Peter","id":"48411","last_name":"Hoyer","first_name":"Kay-Peter"},{"full_name":"Bobbert, Mathias","id":"7850","last_name":"Bobbert","first_name":"Mathias"},{"orcid":"0000-0002-2763-1246","last_name":"Meschut","id":"32056","full_name":"Meschut, Gerson","first_name":"Gerson"},{"first_name":"Mirko","last_name":"Schaper","id":"43720","full_name":"Schaper, Mirko"}],"volume":408,"main_file_link":[{"url":"\thttps://doi.org/10.1051/matecconf/202540801081","open_access":"1"}],"doi":"10.1051/matecconf/202540801081","conference":{"start_date":"2025-06-02","name":"44th Conference of the International Deep Drawing Research Group (IDDRG 2025)","location":"Lissabon (Portugal)","end_date":"2025-06-05"},"publication_status":"published","citation":{"ieee":"M. Neuser, M. C. Schlichter, K.-P. Hoyer, M. Bobbert, G. Meschut, and M. Schaper, “Mechanical joinability of microstructurally graded structural components manufactured from hypoeutectic aluminium casting alloys,” <i>44th Conference of the International Deep Drawing Research Group (IDDRG 2025)</i>, vol. 408, Art. no. 01081, 2025, doi: <a href=\"https://doi.org/10.1051/matecconf/202540801081\">10.1051/matecconf/202540801081</a>.","chicago":"Neuser, Moritz, Malte Christian Schlichter, Kay-Peter Hoyer, Mathias Bobbert, Gerson Meschut, and Mirko Schaper. “Mechanical Joinability of Microstructurally Graded Structural Components Manufactured from Hypoeutectic Aluminium Casting Alloys.” <i>44th Conference of the International Deep Drawing Research Group (IDDRG 2025)</i> 408 (2025). <a href=\"https://doi.org/10.1051/matecconf/202540801081\">https://doi.org/10.1051/matecconf/202540801081</a>.","apa":"Neuser, M., Schlichter, M. C., Hoyer, K.-P., Bobbert, M., Meschut, G., &#38; Schaper, M. (2025). Mechanical joinability of microstructurally graded structural components manufactured from hypoeutectic aluminium casting alloys. <i>44th Conference of the International Deep Drawing Research Group (IDDRG 2025)</i>, <i>408</i>, Article 01081. <a href=\"https://doi.org/10.1051/matecconf/202540801081\">https://doi.org/10.1051/matecconf/202540801081</a>","ama":"Neuser M, Schlichter MC, Hoyer K-P, Bobbert M, Meschut G, Schaper M. Mechanical joinability of microstructurally graded structural components manufactured from hypoeutectic aluminium casting alloys. <i>44th Conference of the International Deep Drawing Research Group (IDDRG 2025)</i>. 2025;408. doi:<a href=\"https://doi.org/10.1051/matecconf/202540801081\">10.1051/matecconf/202540801081</a>","mla":"Neuser, Moritz, et al. “Mechanical Joinability of Microstructurally Graded Structural Components Manufactured from Hypoeutectic Aluminium Casting Alloys.” <i>44th Conference of the International Deep Drawing Research Group (IDDRG 2025)</i>, vol. 408, 01081, 2025, doi:<a href=\"https://doi.org/10.1051/matecconf/202540801081\">10.1051/matecconf/202540801081</a>.","bibtex":"@article{Neuser_Schlichter_Hoyer_Bobbert_Meschut_Schaper_2025, title={Mechanical joinability of microstructurally graded structural components manufactured from hypoeutectic aluminium casting alloys}, volume={408}, DOI={<a href=\"https://doi.org/10.1051/matecconf/202540801081\">10.1051/matecconf/202540801081</a>}, number={01081}, journal={44th Conference of the International Deep Drawing Research Group (IDDRG 2025)}, author={Neuser, Moritz and Schlichter, Malte Christian and Hoyer, Kay-Peter and Bobbert, Mathias and Meschut, Gerson and Schaper, Mirko}, year={2025} }","short":"M. Neuser, M.C. Schlichter, K.-P. Hoyer, M. Bobbert, G. Meschut, M. Schaper, 44th Conference of the International Deep Drawing Research Group (IDDRG 2025) 408 (2025)."},"intvolume":"       408","project":[{"name":"TRR 285 - A: TRR 285 - Project Area A","_id":"131"},{"name":"TRR 285 – A02: TRR 285 - Subproject A02","_id":"136"},{"_id":"135","name":"TRR 285 – A01: TRR 285 - Subproject A01"},{"_id":"130","name":"TRR 285:  Methodenentwicklung zur mechanischen Fügbarkeit in wandlungsfähigen Prozessketten"}],"_id":"59872","user_id":"7850","department":[{"_id":"43"},{"_id":"158"},{"_id":"157"},{"_id":"9"},{"_id":"321"}],"article_type":"original","article_number":"01081","type":"journal_article","status":"public"},{"quality_controlled":"1","year":"2025","date_created":"2026-02-24T13:36:06Z","publisher":"Springer Nature Switzerland AG","title":"Unveiling Barriers to Recycling with a Focus on Design: An Ishikawa Diagram-Based Approach with Industrial Application","publication":"Safe and Sustainable Value Creation by Design - Proceedings of the 21st Global Conference on Sustainable Manufacturing","file":[{"access_level":"closed","file_name":"GCSM_2025_Rohde_updated.pdf","file_id":"64617","file_size":333257,"creator":"kathiroh","date_created":"2026-02-24T13:33:47Z","date_updated":"2026-02-24T13:33:47Z","relation":"main_file","success":1,"content_type":"application/pdf"}],"abstract":[{"text":"The circular economy offers decisive advantages over the currently prevalent linear economy in industry. Firstly, the reuse of products, individual parts and material reduces the need for new production or generation and the associated consumption of energy and resources. Secondly, it helps to avoid the generation of waste. Early consideration of circular economic principles in product development processes is essential to specifically promote reuse, reparability and recycling. Efficient recycling of assemblies requires well-defined strategies. However, various challenges hinder the efficiency of technical recycling processes in industrial applications. This paper presents an Ishikawa (fishbone) diagram-based approach to systematically identify and categorize these influences. The method is implemented within an industrial framework, highlighting key obstacles such as material composition, design constraints, use of technology, framework conditions, economic limitations and regulatory challenges. By applying a scenario analysis, this approach examines potential future developments and their impact on recycling-oriented design choices. This helps to identify critical influencing factors and supports the development of resilient and sustainable industrial practices. This framework will serve as the foundation for developing an automated approach to circular design, enabling industries to more effectively integrate sustainability into their processes and adapt to changing environmental demands.","lang":"eng"}],"language":[{"iso":"eng"}],"ddc":["620"],"publication_status":"inpress","has_accepted_license":"1","citation":{"ama":"Rohde K, Gonzalez BF, Budde FL, Ott M, Mozgova I, Mendibe AA. Unveiling Barriers to Recycling with a Focus on Design: An Ishikawa Diagram-Based Approach with Industrial Application. In: Kohl H, Seliger G, Dietrich F, Campana G, eds. <i>Safe and Sustainable Value Creation by Design - Proceedings of the 21st Global Conference on Sustainable Manufacturing</i>. Vol 1. Lecture Notes in Mechanical Engineering. Springer Nature Switzerland AG.","chicago":"Rohde, Katharina, Barbara Fernandez Gonzalez, Finn Lukas Budde, Manuel Ott, Iryna Mozgova, and Alain Alonso Mendibe. “Unveiling Barriers to Recycling with a Focus on Design: An Ishikawa Diagram-Based Approach with Industrial Application.” In <i>Safe and Sustainable Value Creation by Design - Proceedings of the 21st Global Conference on Sustainable Manufacturing</i>, edited by Holger Kohl, Günther Seliger, Franz Dietrich, and Giampaolo Campana, Vol. 1. Lecture Notes in Mechanical Engineering. Springer Nature Switzerland AG, n.d.","ieee":"K. Rohde, B. F. Gonzalez, F. L. Budde, M. Ott, I. Mozgova, and A. A. Mendibe, “Unveiling Barriers to Recycling with a Focus on Design: An Ishikawa Diagram-Based Approach with Industrial Application,” in <i>Safe and Sustainable Value Creation by Design - Proceedings of the 21st Global Conference on Sustainable Manufacturing</i>, Bologna, Italy, vol. 1.","apa":"Rohde, K., Gonzalez, B. F., Budde, F. L., Ott, M., Mozgova, I., &#38; Mendibe, A. A. (n.d.). Unveiling Barriers to Recycling with a Focus on Design: An Ishikawa Diagram-Based Approach with Industrial Application. In H. Kohl, G. Seliger, F. Dietrich, &#38; G. Campana (Eds.), <i>Safe and Sustainable Value Creation by Design - Proceedings of the 21st Global Conference on Sustainable Manufacturing</i> (Vol. 1). Springer Nature Switzerland AG.","bibtex":"@inproceedings{Rohde_Gonzalez_Budde_Ott_Mozgova_Mendibe, series={Lecture Notes in Mechanical Engineering}, title={Unveiling Barriers to Recycling with a Focus on Design: An Ishikawa Diagram-Based Approach with Industrial Application}, volume={1}, booktitle={Safe and Sustainable Value Creation by Design - Proceedings of the 21st Global Conference on Sustainable Manufacturing}, publisher={Springer Nature Switzerland AG}, author={Rohde, Katharina and Gonzalez, Barbara Fernandez and Budde, Finn Lukas and Ott, Manuel and Mozgova, Iryna and Mendibe, Alain Alonso}, editor={Kohl, Holger and Seliger, Günther and Dietrich, Franz and Campana, Giampaolo}, collection={Lecture Notes in Mechanical Engineering} }","short":"K. Rohde, B.F. Gonzalez, F.L. Budde, M. Ott, I. Mozgova, A.A. Mendibe, in: H. Kohl, G. Seliger, F. Dietrich, G. Campana (Eds.), Safe and Sustainable Value Creation by Design - Proceedings of the 21st Global Conference on Sustainable Manufacturing, Springer Nature Switzerland AG, n.d.","mla":"Rohde, Katharina, et al. “Unveiling Barriers to Recycling with a Focus on Design: An Ishikawa Diagram-Based Approach with Industrial Application.” <i>Safe and Sustainable Value Creation by Design - Proceedings of the 21st Global Conference on Sustainable Manufacturing</i>, edited by Holger Kohl et al., vol. 1, Springer Nature Switzerland AG."},"intvolume":"         1","author":[{"first_name":"Katharina","id":"70143","full_name":"Rohde, Katharina","orcid":"0009-0000-5738-7304","last_name":"Rohde"},{"first_name":"Barbara Fernandez","last_name":"Gonzalez","full_name":"Gonzalez, Barbara Fernandez"},{"first_name":"Finn Lukas","full_name":"Budde, Finn Lukas","id":"74585","last_name":"Budde"},{"id":"44204","full_name":"Ott, Manuel","last_name":"Ott","first_name":"Manuel"},{"first_name":"Iryna","last_name":"Mozgova","id":"95903","full_name":"Mozgova, Iryna"},{"first_name":"Alain Alonso","last_name":"Mendibe","full_name":"Mendibe, Alain Alonso"}],"volume":1,"date_updated":"2026-02-24T14:05:50Z","oa":"1","main_file_link":[{"open_access":"1"}],"conference":{"name":"21st Global Conference on Sustainable Manufacturing (GCSM 2025)","start_date":"2025-09-10","end_date":"2025-09-12","location":"Bologna, Italy"},"type":"conference","status":"public","editor":[{"first_name":"Holger","last_name":"Kohl","full_name":"Kohl, Holger"},{"last_name":"Seliger","full_name":"Seliger, Günther","first_name":"Günther"},{"first_name":"Franz","full_name":"Dietrich, Franz","last_name":"Dietrich"},{"full_name":"Campana, Giampaolo","last_name":"Campana","first_name":"Giampaolo"}],"user_id":"70143","series_title":"Lecture Notes in Mechanical Engineering","department":[{"_id":"741"}],"_id":"64616","file_date_updated":"2026-02-24T13:33:47Z"},{"abstract":[{"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","lang":"eng"}],"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":{"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.” <i>Powder Technology</i> 470 (2025). <a href=\"https://doi.org/10.1016/j.powtec.2025.121992\">https://doi.org/10.1016/j.powtec.2025.121992</a>.","ieee":"O. Massopo <i>et al.</i>, “Influence of dispersion gas flow on the spray characteristics and γ-Fe2O3 nanoparticles formation and properties in reference SpraySyn burners,” <i>Powder Technology</i>, vol. 470, Art. no. 121992, 2025, doi: <a href=\"https://doi.org/10.1016/j.powtec.2025.121992\">10.1016/j.powtec.2025.121992</a>.","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. <i>Powder Technology</i>. 2025;470. doi:<a href=\"https://doi.org/10.1016/j.powtec.2025.121992\">10.1016/j.powtec.2025.121992</a>","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., &#38; Schmid, H.-J. (2025). Influence of dispersion gas flow on the spray characteristics and γ-Fe2O3 nanoparticles formation and properties in reference SpraySyn burners. <i>Powder Technology</i>, <i>470</i>, Article 121992. <a href=\"https://doi.org/10.1016/j.powtec.2025.121992\">https://doi.org/10.1016/j.powtec.2025.121992</a>","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).","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={<a href=\"https://doi.org/10.1016/j.powtec.2025.121992\">10.1016/j.powtec.2025.121992</a>}, 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} }","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.” <i>Powder Technology</i>, vol. 470, 121992, Elsevier BV, 2025, doi:<a href=\"https://doi.org/10.1016/j.powtec.2025.121992\">10.1016/j.powtec.2025.121992</a>."},"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"},{"full_name":"Tischendorf, Ricardo","last_name":"Tischendorf","first_name":"Ricardo"},{"first_name":"Munko","last_name":"Gonchikzhapov","full_name":"Gonchikzhapov, Munko"},{"full_name":"Kasper, Tina","last_name":"Kasper","first_name":"Tina"},{"last_name":"Augustin","full_name":"Augustin, Peter","first_name":"Peter"},{"last_name":"Özer","full_name":"Özer, Burak","first_name":"Burak"},{"first_name":"Manuel","full_name":"Reddemann, Manuel","last_name":"Reddemann"},{"full_name":"Kneer, Reinhold","last_name":"Kneer","first_name":"Reinhold"},{"first_name":"Mohammed-Ali","last_name":"Sheikh","full_name":"Sheikh, Mohammed-Ali"},{"first_name":"Aydan Akyildiz","last_name":"Mert","full_name":"Mert, Aydan Akyildiz"},{"last_name":"Wiggers","full_name":"Wiggers, Hartmut","first_name":"Hartmut"},{"last_name":"Schmid","full_name":"Schmid, Hans-Joachim","first_name":"Hans-Joachim"}],"volume":470,"oa":"1","date_updated":"2026-02-25T07:45:44Z"},{"year":"2025","citation":{"chicago":"Pinaud, Matthieu. <i>Manifold of Mappings and Regularity Properties of Half-Lie Groups</i>, 2025. <a href=\"https://doi.org/10.17619/UNIPB/1-2211\">https://doi.org/10.17619/UNIPB/1-2211</a>.","ieee":"M. Pinaud, <i>Manifold of mappings and regularity properties of half-Lie groups</i>. 2025.","mla":"Pinaud, Matthieu. <i>Manifold of Mappings and Regularity Properties of Half-Lie Groups</i>. 2025, doi:<a href=\"https://doi.org/10.17619/UNIPB/1-2211\">10.17619/UNIPB/1-2211</a>.","short":"M. Pinaud, Manifold of Mappings and Regularity Properties of Half-Lie Groups, 2025.","bibtex":"@book{Pinaud_2025, title={Manifold of mappings and regularity properties of half-Lie groups}, DOI={<a href=\"https://doi.org/10.17619/UNIPB/1-2211\">10.17619/UNIPB/1-2211</a>}, author={Pinaud, Matthieu}, year={2025} }","apa":"Pinaud, M. (2025). <i>Manifold of mappings and regularity properties of half-Lie groups</i>. <a href=\"https://doi.org/10.17619/UNIPB/1-2211\">https://doi.org/10.17619/UNIPB/1-2211</a>","ama":"Pinaud M. <i>Manifold of Mappings and Regularity Properties of Half-Lie Groups</i>.; 2025. doi:<a href=\"https://doi.org/10.17619/UNIPB/1-2211\">10.17619/UNIPB/1-2211</a>"},"date_updated":"2026-02-26T21:58:36Z","oa":"1","author":[{"first_name":"Matthieu","full_name":"Pinaud, Matthieu","last_name":"Pinaud"}],"supervisor":[{"first_name":"Helge","last_name":"Glöckner","full_name":"Glöckner, Helge","id":"178"}],"date_created":"2026-02-26T21:58:22Z","title":"Manifold of mappings and regularity properties of half-Lie groups","main_file_link":[{"open_access":"1","url":"https://nbn-resolving.org/urn:nbn:de:hbz:466:2-54221"}],"doi":"10.17619/UNIPB/1-2211","type":"dissertation","status":"public","_id":"64770","user_id":"178","department":[{"_id":"10"},{"_id":"87"},{"_id":"93"}],"language":[{"iso":"eng"}]},{"user_id":"105344","project":[{"name":"TRR 285 - Project Area C","_id":"133"},{"_id":"148","name":"TRR 285 - Subproject C04"},{"_id":"130","name":"TRR 285:  Methodenentwicklung zur mechanischen Fügbarkeit in wandlungsfähigen Prozessketten"},{"name":"TRR 285 - Project Area A","_id":"131"},{"name":"TRR 285 - Subproject A03","_id":"137"},{"name":"TRR 285 - Subproject A01","_id":"135"}],"_id":"61149","status":"public","editor":[{"first_name":"J.F. Silva","last_name":"Gomes","full_name":"Gomes, J.F. Silva"},{"first_name":"Shaker A.","last_name":"Meguid","full_name":"Meguid, Shaker A."}],"type":"conference","main_file_link":[{"open_access":"1","url":"https://www.researchgate.net/publication/395593556_LOCAL_DEFORMATION_AND_FAILURE_OF_COMPOSITES_DURING_SELF-PIERCING_RIVETING_A_CT_BASED_MICROSTRUCTURE_INVESTIGATION"}],"conference":{"name":"8th International Conference on Integrity-Reliability-Failure (IRF2025)","start_date":"2025-07-15","end_date":"2025-07-18","location":"Porto"},"doi":"10.24840/978-972-752-323-8","author":[{"full_name":"Dargel, Alrik","id":"114764","last_name":"Dargel","first_name":"Alrik"},{"last_name":"Gröger","full_name":"Gröger, Benjamin","first_name":"Benjamin"},{"first_name":"Malte Christian","full_name":"Schlichter, Malte Christian","id":"61977","last_name":"Schlichter"},{"last_name":"Gerritzen","orcid":"0000-0002-0169-8602","full_name":"Gerritzen, Johannes","id":"105344","first_name":"Johannes"},{"first_name":"Daniel","last_name":"Köhler","full_name":"Köhler, Daniel","id":"83408"},{"full_name":"Meschut, Gerson","id":"32056","orcid":"0000-0002-2763-1246","last_name":"Meschut","first_name":"Gerson"},{"full_name":"Gude, Maik","last_name":"Gude","first_name":"Maik"},{"first_name":"Robert","full_name":"Kupfer, Robert","last_name":"Kupfer"}],"date_updated":"2026-02-27T06:45:17Z","oa":"1","citation":{"ieee":"A. Dargel <i>et al.</i>, “LOCAL DEFORMATION AND FAILURE OF COMPOSITES DURING SELF-PIERCING RIVETING: A CT BASED MICROSTRUCTURE INVESTIGATION,” in <i>Proceedings of the 8th International Conference on Integrity-Reliability-Failure (IRF2025)</i>, Porto, 2025, doi: <a href=\"https://doi.org/10.24840/978-972-752-323-8\">10.24840/978-972-752-323-8</a>.","chicago":"Dargel, Alrik, Benjamin Gröger, Malte Christian Schlichter, Johannes Gerritzen, Daniel Köhler, Gerson Meschut, Maik Gude, and Robert Kupfer. “LOCAL DEFORMATION AND FAILURE OF COMPOSITES DURING SELF-PIERCING RIVETING: A CT BASED MICROSTRUCTURE INVESTIGATION.” In <i>Proceedings of the 8th International Conference on Integrity-Reliability-Failure (IRF2025)</i>, edited by J.F. Silva Gomes and Shaker A. Meguid. Porto: FEUP, 2025. <a href=\"https://doi.org/10.24840/978-972-752-323-8\">https://doi.org/10.24840/978-972-752-323-8</a>.","apa":"Dargel, A., Gröger, B., Schlichter, M. C., Gerritzen, J., Köhler, D., Meschut, G., Gude, M., &#38; Kupfer, R. (2025). LOCAL DEFORMATION AND FAILURE OF COMPOSITES DURING SELF-PIERCING RIVETING: A CT BASED MICROSTRUCTURE INVESTIGATION. In J. F. S. Gomes &#38; S. A. Meguid (Eds.), <i>Proceedings of the 8th International Conference on Integrity-Reliability-Failure (IRF2025)</i>. FEUP. <a href=\"https://doi.org/10.24840/978-972-752-323-8\">https://doi.org/10.24840/978-972-752-323-8</a>","ama":"Dargel A, Gröger B, Schlichter MC, et al. LOCAL DEFORMATION AND FAILURE OF COMPOSITES DURING SELF-PIERCING RIVETING: A CT BASED MICROSTRUCTURE INVESTIGATION. In: Gomes JFS, Meguid SA, eds. <i>Proceedings of the 8th International Conference on Integrity-Reliability-Failure (IRF2025)</i>. FEUP; 2025. doi:<a href=\"https://doi.org/10.24840/978-972-752-323-8\">10.24840/978-972-752-323-8</a>","short":"A. Dargel, B. Gröger, M.C. Schlichter, J. Gerritzen, D. Köhler, G. Meschut, M. Gude, R. Kupfer, in: J.F.S. Gomes, S.A. Meguid (Eds.), Proceedings of the 8th International Conference on Integrity-Reliability-Failure (IRF2025), FEUP, Porto, 2025.","mla":"Dargel, Alrik, et al. “LOCAL DEFORMATION AND FAILURE OF COMPOSITES DURING SELF-PIERCING RIVETING: A CT BASED MICROSTRUCTURE INVESTIGATION.” <i>Proceedings of the 8th International Conference on Integrity-Reliability-Failure (IRF2025)</i>, edited by J.F. Silva Gomes and Shaker A. Meguid, FEUP, 2025, doi:<a href=\"https://doi.org/10.24840/978-972-752-323-8\">10.24840/978-972-752-323-8</a>.","bibtex":"@inproceedings{Dargel_Gröger_Schlichter_Gerritzen_Köhler_Meschut_Gude_Kupfer_2025, place={Porto}, title={LOCAL DEFORMATION AND FAILURE OF COMPOSITES DURING SELF-PIERCING RIVETING: A CT BASED MICROSTRUCTURE INVESTIGATION}, DOI={<a href=\"https://doi.org/10.24840/978-972-752-323-8\">10.24840/978-972-752-323-8</a>}, booktitle={Proceedings of the 8th International Conference on Integrity-Reliability-Failure (IRF2025)}, publisher={FEUP}, author={Dargel, Alrik and Gröger, Benjamin and Schlichter, Malte Christian and Gerritzen, Johannes and Köhler, Daniel and Meschut, Gerson and Gude, Maik and Kupfer, Robert}, editor={Gomes, J.F. Silva and Meguid, Shaker A.}, year={2025} }"},"place":"Porto","publication_status":"published","publication_identifier":{"isbn":["9789727523238"]},"language":[{"iso":"eng"}],"keyword":["self-piercing riveting","computed tomography","thermoplastic composites","process-structure-interaction"],"abstract":[{"text":"The use of continuous fiber-reinforced thermoplastics (FRTP) in automotive industry increases due to their excellent material properties and possibility of rapid processing. The scale spanning heterogeneity of their material structure and its influence on the material behavior, however, presents significant challenges for most joining technologies, such as self-piercing riveting (SPR). During mechanical joining, the material structure is significantly altered within and around the joining zone, heavily influencing the material behavior. A comprehensive understanding of the underlying phenomena of material alteration during the SPR process is essential as basis for validating numerical simulations. This study examines the material structure at ten stages of a step-setting test of SPR with two FRTP sheets with glass-fiber reinforcement. Utilizing X-ray computed tomography (CT), the damage phenomena within different areas of the setting test are analyzed three-dimensionally and key parameters are quantified. Dominating phenomena during the penetration of the rivet into the laminate are fiber failure (FF), interfiber failure (IFF) and fiber bending, while delamination, fiber kinking and roving splitting are also observed. At the final stages, the bottom layers of the second sheet collapse and form a bulge into the cavity of the die.","lang":"eng"}],"publication":"Proceedings of the 8th International Conference on Integrity-Reliability-Failure (IRF2025)","title":"LOCAL DEFORMATION AND FAILURE OF COMPOSITES DURING SELF-PIERCING RIVETING: A CT BASED MICROSTRUCTURE INVESTIGATION","date_created":"2025-09-08T11:52:45Z","publisher":"FEUP","year":"2025"},{"citation":{"ieee":"M. Godau, J. Barreiro, K. Hermann, T. Neuhausen, D. Maxelon, and V. Weidner, “‘Wofür bin ich denn hier, wenn ich nicht in irgendeiner Weise auch helfen kann?’ Zur Rolle der Lehrkraft beim selbstständigen Songwriting im Unterricht,” in <i>46. Jahresband des Arbeitskreises Musikpädagogische Forschung/46th Yearbook of the German Association for Research in Music Education</i>, U. Frey-Konrad, V. C. Hofbauer, O. Blanchard, and L. Bugiel, Eds. Waxmann, 2025.","chicago":"Godau, Marc, Julia Barreiro, Katharina Hermann, Timo Neuhausen, Dominik Maxelon, and Verena Weidner. “‘Wofür bin ich denn hier, wenn ich nicht in irgendeiner Weise auch helfen kann?’ Zur Rolle der Lehrkraft beim selbstständigen Songwriting im Unterricht.” In <i>46. Jahresband des Arbeitskreises Musikpädagogische Forschung/46th Yearbook of the German Association for Research in Music Education</i>, edited by Ute Frey-Konrad, Viola Cäcilia Hofbauer, Olivier Blanchard, and Lukas Bugiel. Waxmann, 2025. <a href=\"https://doi.org/10.31244/9783818850715.13\">https://doi.org/10.31244/9783818850715.13</a>.","ama":"Godau M, Barreiro J, Hermann K, Neuhausen T, Maxelon D, Weidner V. “Wofür bin ich denn hier, wenn ich nicht in irgendeiner Weise auch helfen kann?” Zur Rolle der Lehrkraft beim selbstständigen Songwriting im Unterricht. In: Frey-Konrad U, Hofbauer VC, Blanchard O, Bugiel L, eds. <i>46. Jahresband des Arbeitskreises Musikpädagogische Forschung/46th Yearbook of the German Association for Research in Music Education</i>. Waxmann; 2025. doi:<a href=\"https://doi.org/10.31244/9783818850715.13\">10.31244/9783818850715.13</a>","apa":"Godau, M., Barreiro, J., Hermann, K., Neuhausen, T., Maxelon, D., &#38; Weidner, V. (2025). “Wofür bin ich denn hier, wenn ich nicht in irgendeiner Weise auch helfen kann?” Zur Rolle der Lehrkraft beim selbstständigen Songwriting im Unterricht. In U. Frey-Konrad, V. C. Hofbauer, O. Blanchard, &#38; L. Bugiel (Eds.), <i>46. Jahresband des Arbeitskreises Musikpädagogische Forschung/46th Yearbook of the German Association for Research in Music Education</i>. Waxmann. <a href=\"https://doi.org/10.31244/9783818850715.13\">https://doi.org/10.31244/9783818850715.13</a>","short":"M. Godau, J. Barreiro, K. Hermann, T. Neuhausen, D. Maxelon, V. Weidner, in: U. Frey-Konrad, V.C. Hofbauer, O. Blanchard, L. Bugiel (Eds.), 46. Jahresband des Arbeitskreises Musikpädagogische Forschung/46th Yearbook of the German Association for Research in Music Education, Waxmann, 2025.","mla":"Godau, Marc, et al. “‘Wofür bin ich denn hier, wenn ich nicht in irgendeiner Weise auch helfen kann?’ Zur Rolle der Lehrkraft beim selbstständigen Songwriting im Unterricht.” <i>46. Jahresband des Arbeitskreises Musikpädagogische Forschung/46th Yearbook of the German Association for Research in Music Education</i>, edited by Ute Frey-Konrad et al., Waxmann, 2025, doi:<a href=\"https://doi.org/10.31244/9783818850715.13\">10.31244/9783818850715.13</a>.","bibtex":"@inbook{Godau_Barreiro_Hermann_Neuhausen_Maxelon_Weidner_2025, title={“Wofür bin ich denn hier, wenn ich nicht in irgendeiner Weise auch helfen kann?” Zur Rolle der Lehrkraft beim selbstständigen Songwriting im Unterricht}, DOI={<a href=\"https://doi.org/10.31244/9783818850715.13\">10.31244/9783818850715.13</a>}, booktitle={46. Jahresband des Arbeitskreises Musikpädagogische Forschung/46th Yearbook of the German Association for Research in Music Education}, publisher={Waxmann}, author={Godau, Marc and Barreiro, Julia and Hermann, Katharina and Neuhausen, Timo and Maxelon, Dominik and Weidner, Verena}, editor={Frey-Konrad, Ute and Hofbauer, Viola Cäcilia and Blanchard, Olivier and Bugiel, Lukas}, year={2025} }"},"year":"2025","publication_status":"published","publication_identifier":{"isbn":["9783818800710"]},"quality_controlled":"1","main_file_link":[{"open_access":"1"}],"doi":"10.31244/9783818850715.13","title":"\"Wofür bin ich denn hier, wenn ich nicht in irgendeiner Weise auch helfen kann?\" Zur Rolle der Lehrkraft beim selbstständigen Songwriting im Unterricht","date_created":"2026-02-28T09:50:45Z","author":[{"last_name":"Godau","id":"98877","full_name":"Godau, Marc","first_name":"Marc"},{"first_name":"Julia","last_name":"Barreiro","full_name":"Barreiro, Julia"},{"full_name":"Hermann, Katharina","last_name":"Hermann","first_name":"Katharina"},{"orcid":"0000-0002-8262-767X","last_name":"Neuhausen","full_name":"Neuhausen, Timo","id":"99991","first_name":"Timo"},{"first_name":"Dominik","full_name":"Maxelon, Dominik","last_name":"Maxelon"},{"full_name":"Weidner, Verena","last_name":"Weidner","first_name":"Verena"}],"oa":"1","date_updated":"2026-02-28T15:29:25Z","publisher":"Waxmann","status":"public","editor":[{"last_name":"Frey-Konrad","full_name":"Frey-Konrad, Ute","first_name":"Ute"},{"first_name":"Viola Cäcilia","last_name":"Hofbauer","full_name":"Hofbauer, Viola Cäcilia"},{"first_name":"Olivier","full_name":"Blanchard, Olivier","last_name":"Blanchard"},{"first_name":"Lukas","full_name":"Bugiel, Lukas","last_name":"Bugiel"}],"abstract":[{"text":"The article explores the role of teachers in self-directed songwriting in school music based on the informal learning approach. It investigates a didactic design that was implemented in six schools and was empirically researched utilizing si-tuational analysis. Based on tensions, that emerge due to conflicting expectations, it can be shown, that the teacher's role extends beyond the dichotomy of directive instruction versus open facilitation. Instead, it encompasses an interplay of six divergent roles which are discussed in their positions in relation to each other. These considerations enrich the understanding of teaching practices in popular music education, emphasizing the redefinition of teacher-student relationships for song-writing in school music.","lang":"eng"}],"type":"book_chapter","publication":"46. Jahresband des Arbeitskreises Musikpädagogische Forschung/46th Yearbook of the German Association for Research in Music Education","language":[{"iso":"ger"}],"user_id":"99991","department":[{"_id":"131"},{"_id":"36"},{"_id":"129"},{"_id":"540"}],"_id":"64793"},{"title":"Die Rolle institutionalisierter Standards für die Hybridisierung musikalischer Praxen. Zur Soziomaterialität von Songwriting-Producing im Bedroom-Studio","publisher":"Waxmann","date_created":"2026-02-28T09:47:25Z","year":"2025","quality_controlled":"1","language":[{"iso":"eng"}],"abstract":[{"text":"The role of institutionalized standards for the hybridization of musical practices. On the socio-materiality of songwriting-producing in the bedroom studio This study examines the socio-materiality of hybrid music practices in bedroom studios, focusing on the interplay between traditional music education institutions and YouTube education. A single case situational analysis reveals how standardized instrumental and music production practices are combined to form a hybrid practice. It shows that traditional music education institutions, such as music schools and conservatories, specialize in the selection of chord tones, while You-Tube videos focus on sound design. Using an actor-network theory approach, the study demonstrates the permeability of informal and institutional learning spaces. The findings suggest that songwriting-producing is not simply a sum of different practices, but rather a process of negotiation and compromise between different standards and goals, as well as the distribution of practice between humans and technology.","lang":"eng"}],"publication":"46. Jahresband des Arbeitskreises Musikpädagogische Forschung/46th Yearbook of the German Association for Research in Music Education","main_file_link":[{"open_access":"1"}],"doi":"10.31244/9783818850715.19","date_updated":"2026-02-28T15:28:48Z","oa":"1","author":[{"first_name":"Timo","orcid":"0000-0002-8262-767X","last_name":"Neuhausen","full_name":"Neuhausen, Timo","id":"99991"}],"citation":{"short":"T. Neuhausen, in: U. Frey-Konrad, V.C. Hofbauer, O. Blanchard, L. Bugiel (Eds.), 46. Jahresband Des Arbeitskreises Musikpädagogische Forschung/46th Yearbook of the German Association for Research in Music Education, Waxmann, 2025.","bibtex":"@inbook{Neuhausen_2025, title={Die Rolle institutionalisierter Standards für die Hybridisierung musikalischer Praxen. Zur Soziomaterialität von Songwriting-Producing im Bedroom-Studio}, DOI={<a href=\"https://doi.org/10.31244/9783818850715.19\">10.31244/9783818850715.19</a>}, booktitle={46. Jahresband des Arbeitskreises Musikpädagogische Forschung/46th Yearbook of the German Association for Research in Music Education}, publisher={Waxmann}, author={Neuhausen, Timo}, editor={Frey-Konrad, Ute and Hofbauer, Viola Cäcilia and Blanchard, Olivier and Bugiel, Lukas}, year={2025} }","mla":"Neuhausen, Timo. “Die Rolle Institutionalisierter Standards Für Die Hybridisierung Musikalischer Praxen. Zur Soziomaterialität von Songwriting-Producing Im Bedroom-Studio.” <i>46. Jahresband Des Arbeitskreises Musikpädagogische Forschung/46th Yearbook of the German Association for Research in Music Education</i>, edited by Ute Frey-Konrad et al., Waxmann, 2025, doi:<a href=\"https://doi.org/10.31244/9783818850715.19\">10.31244/9783818850715.19</a>.","ama":"Neuhausen T. Die Rolle institutionalisierter Standards für die Hybridisierung musikalischer Praxen. Zur Soziomaterialität von Songwriting-Producing im Bedroom-Studio. In: Frey-Konrad U, Hofbauer VC, Blanchard O, Bugiel L, eds. <i>46. Jahresband Des Arbeitskreises Musikpädagogische Forschung/46th Yearbook of the German Association for Research in Music Education</i>. Waxmann; 2025. doi:<a href=\"https://doi.org/10.31244/9783818850715.19\">10.31244/9783818850715.19</a>","apa":"Neuhausen, T. (2025). Die Rolle institutionalisierter Standards für die Hybridisierung musikalischer Praxen. Zur Soziomaterialität von Songwriting-Producing im Bedroom-Studio. In U. Frey-Konrad, V. C. Hofbauer, O. Blanchard, &#38; L. Bugiel (Eds.), <i>46. Jahresband des Arbeitskreises Musikpädagogische Forschung/46th Yearbook of the German Association for Research in Music Education</i>. Waxmann. <a href=\"https://doi.org/10.31244/9783818850715.19\">https://doi.org/10.31244/9783818850715.19</a>","ieee":"T. Neuhausen, “Die Rolle institutionalisierter Standards für die Hybridisierung musikalischer Praxen. Zur Soziomaterialität von Songwriting-Producing im Bedroom-Studio,” in <i>46. Jahresband des Arbeitskreises Musikpädagogische Forschung/46th Yearbook of the German Association for Research in Music Education</i>, U. Frey-Konrad, V. C. Hofbauer, O. Blanchard, and L. Bugiel, Eds. Waxmann, 2025.","chicago":"Neuhausen, Timo. “Die Rolle Institutionalisierter Standards Für Die Hybridisierung Musikalischer Praxen. Zur Soziomaterialität von Songwriting-Producing Im Bedroom-Studio.” In <i>46. Jahresband Des Arbeitskreises Musikpädagogische Forschung/46th Yearbook of the German Association for Research in Music Education</i>, edited by Ute Frey-Konrad, Viola Cäcilia Hofbauer, Olivier Blanchard, and Lukas Bugiel. Waxmann, 2025. <a href=\"https://doi.org/10.31244/9783818850715.19\">https://doi.org/10.31244/9783818850715.19</a>."},"publication_status":"published","publication_identifier":{"isbn":["9783818800710"]},"_id":"64792","user_id":"99991","department":[{"_id":"131"},{"_id":"36"},{"_id":"129"},{"_id":"540"}],"editor":[{"full_name":"Frey-Konrad, Ute","last_name":"Frey-Konrad","first_name":"Ute"},{"last_name":"Hofbauer","full_name":"Hofbauer, Viola Cäcilia","first_name":"Viola Cäcilia"},{"first_name":"Olivier","last_name":"Blanchard","full_name":"Blanchard, Olivier"},{"first_name":"Lukas","full_name":"Bugiel, Lukas","last_name":"Bugiel"}],"status":"public","type":"book_chapter"},{"year":"2025","citation":{"ama":"Scheidemann C, Bornmann P, Littmann W, Hemsel T. Bolted Langevin transducers with leadfree piezoelectric ceramics. In: ; 2025.","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.","apa":"Scheidemann, C., Bornmann, P., Littmann, W., &#38; Hemsel, T. (2025). <i>Bolted Langevin transducers with leadfree piezoelectric ceramics</i>. International Workshop on Piezoelectric Materials and Applications in Actuators (IWPMA), Vilnius, Lithuania.","mla":"Scheidemann, Claus, et al. <i>Bolted Langevin Transducers with Leadfree Piezoelectric Ceramics</i>. 2025.","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} }","short":"C. Scheidemann, P. Bornmann, W. Littmann, T. Hemsel, in: 2025."},"has_accepted_license":"1","title":"Bolted Langevin transducers with leadfree piezoelectric ceramics","conference":{"start_date":"2025-07-01","name":"International Workshop on Piezoelectric Materials and Applications in Actuators (IWPMA)","location":"Vilnius, Lithuania","end_date":"2025-07-03"},"oa":"1","date_updated":"2026-03-02T11:04:56Z","author":[{"first_name":"Claus","full_name":"Scheidemann, Claus","id":"38259","last_name":"Scheidemann"},{"last_name":"Bornmann","full_name":"Bornmann, Peter","first_name":"Peter"},{"last_name":"Littmann","full_name":"Littmann, Walter","first_name":"Walter"},{"id":"210","full_name":"Hemsel, Tobias","last_name":"Hemsel","first_name":"Tobias"}],"date_created":"2026-03-02T10:39:40Z","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"}],"status":"public","file":[{"content_type":"application/pdf","relation":"main_file","date_updated":"2026-03-02T11:00:37Z","creator":"hemsel","date_created":"2026-03-02T10:37:46Z","file_size":1812289,"access_level":"open_access","file_name":"IWPMA_2025_Hemsel.pdf","file_id":"64799"}],"type":"conference","keyword":["lead free piezoelectric ceramics","bolted Langevin transducer","medium power ultrasound."],"ddc":["620"],"file_date_updated":"2026-03-02T11:00:37Z","language":[{"iso":"eng"}],"_id":"64798","department":[{"_id":"151"}],"user_id":"210"},{"ddc":["620"],"file_date_updated":"2026-03-02T10:58:37Z","language":[{"iso":"eng"}],"_id":"64800","department":[{"_id":"151"}],"user_id":"210","abstract":[{"lang":"eng","text":"Intensive ultrasonic cleaning of surfaces by means of a lead-free ultrasonic transducer with focusing sonotrode\r\nUltrasonic cleaning baths are probably a coincidental development: After underwater sonars had already been successfully used to detect submarines before 1920, it was probably observed in this environment that the ultrasonic oscillators not only showed a self-cleaning effect but also cavitation damage. At the beginning of the 1950s, the first ultrasonic cleaning devices finally came onto the market. Today, the range of applications ranges from household appliances for jewellery and eyewear cleaning to classic cleaning baths for metal parts and systems for cleaning highly sensitive electronic components. There is a certain gap in handheld, mobile cleaning equipment. Although devices for spot cleaning of textiles are known, the cleaning effect is usually low. \r\nDue to the directive 2011/65/EU on the restriction of the use of hazardous substances in electrical and electronic equipment (RoHS) [1] lead should no longer be used in technical devices. As today’s standard ceramics for medium and high-power ultrasonic transducers typically contain lead, there is a need to explore the use of lead-free ceramics in this field. Honda [2] already offers a cleaning transducer based on lead-free piezoelectric ceramics, but it is designed to be used in cleaning baths.\r\nThis article presents the model-based development of a highly innovative ultrasonic cleaner. On the one hand, lead-free piezoelectric ceramics are used, and on the other hand, a special sonotrode has been developed that concentrates the sound in such a way that a strong cavitation and thus cleaning effect is achieved with comparatively low power in a short time. Coupled field finite element method was used to find an appropriate geometry for the focussing sonotrode. The comparison of simulation and measurement results shows that the lead-free piezoceramics used do their job well and can keep up with standard ceramics, but more ceramic volume is needed to achieve same power. An advanced control concept was elaborated to ensure continuous hard cavitation at varying distances between the sonotrode and the part to be cleaned. Cleaning results for different surfaces and contaminations are presented. The concept of the focusing sonotrode shows that a convincing cleaning result can be achieved even with low power and in short time, provided that the oscillation system and control electronics are suitably coordinated.\r\n\r\nReferences\r\n[1] http://data.europa.eu/eli/dir/2011/65/2024-08-01 \r\n[2] https://en.honda-el.co.jp/product/ceramics/lineup/lead_off/lead-off \r\n"}],"status":"public","file":[{"relation":"main_file","content_type":"application/pdf","file_id":"64801","file_name":"ICU_2025_Hemsel.pdf","access_level":"open_access","file_size":1946202,"date_created":"2026-03-02T10:46:43Z","creator":"hemsel","date_updated":"2026-03-02T10:58:37Z"}],"type":"conference","title":"Intensive ultrasonic cleaning of surfaces by means of lead-free ultrasonic transducer with focussing sonotrode","conference":{"end_date":"2025-09-25","location":"Paderborn, Germany","name":"International Congress on Ultrasonics (ICU)","start_date":"2025-09-21"},"oa":"1","date_updated":"2026-03-02T10:58:37Z","date_created":"2026-03-02T10:47:48Z","author":[{"first_name":"Tobias","full_name":"Hemsel, Tobias","id":"210","last_name":"Hemsel"},{"first_name":"Claus","full_name":"Scheidemann, Claus","id":"38259","last_name":"Scheidemann"},{"full_name":"Bornmann, Peter","last_name":"Bornmann","first_name":"Peter"},{"last_name":"Littmann","full_name":"Littmann, Walter","first_name":"Walter"},{"first_name":"Walter","full_name":"Sextro, Walter","id":"21220","last_name":"Sextro"}],"year":"2025","citation":{"apa":"Hemsel, T., Scheidemann, C., Bornmann, P., Littmann, W., &#38; Sextro, W. (2025). <i>Intensive ultrasonic cleaning of surfaces by means of lead-free ultrasonic transducer with focussing sonotrode</i>. International Congress on Ultrasonics (ICU), Paderborn, Germany.","ama":"Hemsel T, Scheidemann C, Bornmann P, Littmann W, Sextro W. Intensive ultrasonic cleaning of surfaces by means of lead-free ultrasonic transducer with focussing sonotrode. In: ; 2025.","short":"T. Hemsel, C. Scheidemann, P. Bornmann, W. Littmann, W. Sextro, in: 2025.","bibtex":"@inproceedings{Hemsel_Scheidemann_Bornmann_Littmann_Sextro_2025, title={Intensive ultrasonic cleaning of surfaces by means of lead-free ultrasonic transducer with focussing sonotrode}, author={Hemsel, Tobias and Scheidemann, Claus and Bornmann, Peter and Littmann, Walter and Sextro, Walter}, year={2025} }","mla":"Hemsel, Tobias, et al. <i>Intensive Ultrasonic Cleaning of Surfaces by Means of Lead-Free Ultrasonic Transducer with Focussing Sonotrode</i>. 2025.","chicago":"Hemsel, Tobias, Claus Scheidemann, Peter Bornmann, Walter Littmann, and Walter Sextro. “Intensive Ultrasonic Cleaning of Surfaces by Means of Lead-Free Ultrasonic Transducer with Focussing Sonotrode,” 2025.","ieee":"T. Hemsel, C. Scheidemann, P. Bornmann, W. Littmann, and W. Sextro, “Intensive ultrasonic cleaning of surfaces by means of lead-free ultrasonic transducer with focussing sonotrode,” presented at the International Congress on Ultrasonics (ICU), Paderborn, Germany, 2025."},"has_accepted_license":"1"},{"has_accepted_license":"1","citation":{"short":"C. Scheidemann, T. Hemsel, W. Sextro, in: 2025.","bibtex":"@inproceedings{Scheidemann_Hemsel_Sextro_2025, title={Time dependent material characteristics of prestressed piezoelectric ceramics in langevin transducers}, author={Scheidemann, Claus and Hemsel, Tobias and Sextro, Walter}, year={2025} }","mla":"Scheidemann, Claus, et al. <i>Time Dependent Material Characteristics of Prestressed Piezoelectric Ceramics in Langevin Transducers</i>. 2025.","ama":"Scheidemann C, Hemsel T, Sextro W. Time dependent material characteristics of prestressed piezoelectric ceramics in langevin transducers. In: ; 2025.","apa":"Scheidemann, C., Hemsel, T., &#38; Sextro, W. (2025). <i>Time dependent material characteristics of prestressed piezoelectric ceramics in langevin transducers</i>. 22nd International Workshop on Piezoelectric Materials and Applications in Actuators (IWPMA), Vilnius, Lithuania.","ieee":"C. Scheidemann, T. Hemsel, and W. Sextro, “Time dependent material characteristics of prestressed piezoelectric ceramics in langevin transducers,” presented at the 22nd International Workshop on Piezoelectric Materials and Applications in Actuators (IWPMA), Vilnius, Lithuania, 2025.","chicago":"Scheidemann, Claus, Tobias Hemsel, and Walter Sextro. “Time Dependent Material Characteristics of Prestressed Piezoelectric Ceramics in Langevin Transducers,” 2025."},"year":"2025","date_created":"2025-10-08T14:22:32Z","author":[{"first_name":"Claus","id":"38259","full_name":"Scheidemann, Claus","last_name":"Scheidemann"},{"full_name":"Hemsel, Tobias","id":"210","last_name":"Hemsel","first_name":"Tobias"},{"last_name":"Sextro","full_name":"Sextro, Walter","id":"21220","first_name":"Walter"}],"oa":"1","date_updated":"2026-03-02T10:59:53Z","conference":{"location":"Vilnius, Lithuania","end_date":"2025-07-3","start_date":"2025-07-1","name":"22nd International Workshop on Piezoelectric Materials and Applications in Actuators (IWPMA)"},"title":"Time dependent material characteristics of prestressed piezoelectric ceramics in langevin transducers","type":"conference","file":[{"relation":"main_file","content_type":"application/pdf","file_name":"SHS25_IWPMA_2025.pdf","access_level":"open_access","file_id":"63817","file_size":644147,"date_created":"2026-01-30T11:07:48Z","creator":"hemsel","date_updated":"2026-03-02T10:59:53Z"}],"status":"public","user_id":"210","department":[{"_id":"151"}],"project":[{"name":"FOR 5208: Modellbasierte Bestimmung nichtlinearer Eigenschaften von Piezokeramiken für Leistungsschallanwendungen (NEPTUN)","_id":"245"}],"_id":"61755","file_date_updated":"2026-03-02T10:59:53Z","language":[{"iso":"eng"}],"ddc":["620"]},{"type":"conference","file":[{"file_size":783790,"file_name":"Sch25_ICU_2025.pdf","file_id":"63816","access_level":"open_access","date_updated":"2026-03-02T10:59:36Z","creator":"hemsel","date_created":"2026-01-30T07:30:44Z","relation":"main_file","content_type":"application/pdf"}],"status":"public","user_id":"210","department":[{"_id":"151"}],"project":[{"_id":"245","name":"FOR 5208: Modellbasierte Bestimmung nichtlinearer Eigenschaften von Piezokeramiken für Leistungsschallanwendungen (NEPTUN)"}],"_id":"61757","file_date_updated":"2026-03-02T10:59:36Z","language":[{"iso":"eng"}],"ddc":["620"],"has_accepted_license":"1","citation":{"ama":"Scheidemann C, Porzenheim J, Hemsel T, Sextro W. Investigation of the Setting Behaviour of Mechanically Biased Piezoelectric Ultrasonic Transducers. In: ; 2025.","ieee":"C. Scheidemann, J. Porzenheim, T. Hemsel, and W. Sextro, “Investigation of the Setting Behaviour of Mechanically Biased Piezoelectric Ultrasonic Transducers,” presented at the 2025 International Congress on Ultrasonics (ICU), Paderborn, Germany, 2025.","chicago":"Scheidemann, Claus, Julius Porzenheim, Tobias Hemsel, and Walter Sextro. “Investigation of the Setting Behaviour of Mechanically Biased Piezoelectric Ultrasonic Transducers,” 2025.","apa":"Scheidemann, C., Porzenheim, J., Hemsel, T., &#38; Sextro, W. (2025). <i>Investigation of the Setting Behaviour of Mechanically Biased Piezoelectric Ultrasonic Transducers</i>. 2025 International Congress on Ultrasonics (ICU), Paderborn, Germany.","short":"C. Scheidemann, J. Porzenheim, T. Hemsel, W. Sextro, in: 2025.","bibtex":"@inproceedings{Scheidemann_Porzenheim_Hemsel_Sextro_2025, title={Investigation of the Setting Behaviour of Mechanically Biased Piezoelectric Ultrasonic Transducers}, author={Scheidemann, Claus and Porzenheim, Julius and Hemsel, Tobias and Sextro, Walter}, year={2025} }","mla":"Scheidemann, Claus, et al. <i>Investigation of the Setting Behaviour of Mechanically Biased Piezoelectric Ultrasonic Transducers</i>. 2025."},"year":"2025","author":[{"first_name":"Claus","full_name":"Scheidemann, Claus","id":"38259","last_name":"Scheidemann"},{"last_name":"Porzenheim","full_name":"Porzenheim, Julius","first_name":"Julius"},{"last_name":"Hemsel","full_name":"Hemsel, Tobias","id":"210","first_name":"Tobias"},{"id":"21220","full_name":"Sextro, Walter","last_name":"Sextro","first_name":"Walter"}],"date_created":"2025-10-08T14:33:44Z","date_updated":"2026-03-02T10:59:36Z","oa":"1","conference":{"end_date":"2025-09-25","location":"Paderborn, Germany","name":"2025 International Congress on Ultrasonics (ICU)","start_date":"2025-09-21"},"title":"Investigation of the Setting Behaviour of Mechanically Biased Piezoelectric Ultrasonic Transducers"},{"has_accepted_license":"1","publication_status":"inpress","citation":{"bibtex":"@inproceedings{Rohde_Ott_Budde_Mozgova, title={Optimierung modularer Produkte für die Mobilität: Ein Klassifizierungsrahmen für zirkuläre Produkte}, booktitle={Solving Conflicts on the Way to Sustainable Mobility: Technische und betriebswirtschaftliche Aspekte}, publisher={Springer Nature Meteor}, author={Rohde, Katharina and Ott, Manuel and Budde, Finn Lukas and Mozgova, Iryna}, editor={Proff, Heike} }","short":"K. Rohde, M. Ott, F.L. Budde, I. Mozgova, in: H. Proff (Ed.), Solving Conflicts on the Way to Sustainable Mobility: Technische und betriebswirtschaftliche Aspekte, Springer Nature Meteor, n.d.","mla":"Rohde, Katharina, et al. “Optimierung modularer Produkte für die Mobilität: Ein Klassifizierungsrahmen für zirkuläre Produkte.” <i>Solving Conflicts on the Way to Sustainable Mobility: Technische und betriebswirtschaftliche Aspekte</i>, edited by Heike Proff, Springer Nature Meteor.","apa":"Rohde, K., Ott, M., Budde, F. L., &#38; Mozgova, I. (n.d.). Optimierung modularer Produkte für die Mobilität: Ein Klassifizierungsrahmen für zirkuläre Produkte. In H. Proff (Ed.), <i>Solving Conflicts on the Way to Sustainable Mobility: Technische und betriebswirtschaftliche Aspekte</i>. Springer Nature Meteor.","ama":"Rohde K, Ott M, Budde FL, Mozgova I. Optimierung modularer Produkte für die Mobilität: Ein Klassifizierungsrahmen für zirkuläre Produkte. In: Proff H, ed. <i>Solving Conflicts on the Way to Sustainable Mobility: Technische und betriebswirtschaftliche Aspekte</i>. Springer Nature Meteor.","ieee":"K. Rohde, M. Ott, F. L. Budde, and I. Mozgova, “Optimierung modularer Produkte für die Mobilität: Ein Klassifizierungsrahmen für zirkuläre Produkte,” in <i>Solving Conflicts on the Way to Sustainable Mobility: Technische und betriebswirtschaftliche Aspekte</i>, Duisburg.","chicago":"Rohde, Katharina, Manuel Ott, Finn Lukas Budde, and Iryna Mozgova. “Optimierung modularer Produkte für die Mobilität: Ein Klassifizierungsrahmen für zirkuläre Produkte.” In <i>Solving Conflicts on the Way to Sustainable Mobility: Technische und betriebswirtschaftliche Aspekte</i>, edited by Heike Proff. Springer Nature Meteor, n.d."},"date_updated":"2026-03-03T11:21:06Z","oa":"1","author":[{"first_name":"Katharina","id":"70143","full_name":"Rohde, Katharina","orcid":"0009-0000-5738-7304","last_name":"Rohde"},{"first_name":"Manuel","last_name":"Ott","id":"44204","full_name":"Ott, Manuel"},{"last_name":"Budde","full_name":"Budde, Finn Lukas","id":"74585","first_name":"Finn Lukas"},{"id":"95903","full_name":"Mozgova, Iryna","last_name":"Mozgova","first_name":"Iryna"}],"conference":{"location":"Duisburg","start_date":"2025-05-15","name":"17. Wissenschaftsforum Mobilität"},"main_file_link":[{"open_access":"1"}],"type":"conference","editor":[{"last_name":"Proff","full_name":"Proff, Heike","first_name":"Heike"}],"status":"public","_id":"64611","department":[{"_id":"741"}],"user_id":"70143","quality_controlled":"1","year":"2025","publisher":"Springer Nature Meteor","date_created":"2026-02-24T12:40:57Z","title":"Optimierung modularer Produkte für die Mobilität: Ein Klassifizierungsrahmen für zirkuläre Produkte","publication":"Solving Conflicts on the Way to Sustainable Mobility: Technische und betriebswirtschaftliche Aspekte","abstract":[{"text":"Für die Aufrechterhaltung der natürlichen Ressourcen ist eine effiziente Nutzung dieser essenziell. Vor diesem Hintergrund untersucht das vorliegende Paper die Rolle der Kreislaufwirtschaft als wegweisendes Wirtschaftsmodell, das von der Europäischen Union gefördert wird. Ziel der Kreislaufwirtschaft ist es, den Ressourcenverbrauch und die Abfallproduktion zu minimieren, indem ein kontinuierlicher Kreislauf aus Nutzung, Wiederverwendung und Recycling von Materialien geschaffen wird. \r\nEin zentraler Aspekt dabei ist der Produktentwicklungsprozess (PEP) - ein vielschichtiger Prozess mit zahlreichen Einflussfaktoren und theoretisch unbegrenzten Gestaltungsmöglichkeiten. Diese Vielfalt führt jedoch zu erheblichen Entscheidungsunsicherheiten, die die Umsetzung von Kreislaufwirtschaftsprinzipien erschweren können. Um diese Herausforderungen zu adressieren, wird ein methodischer Prozess vorgestellt, der eine systematische Klassifizierung im Zusammenhang mit umliegenden Bauteilen ermöglicht. Die Methodik basiert auf einer strukturierten Bewertung von Bauteilen hinsichtlich ihrer Relevanz für die Kreislaufwirtschaft. Dabei werden zentrale Aspekte wie Wiederverwendbarkeit, Recyclingfähigkeit und Ressourceneffizienz berücksichtigt, darunter: \r\n•\tHandelt es sich um ein Gebrauchs- oder Verbrauchsprodukt?\r\n•\tIst das Bauteil eine Wiederverwendung oder eine Neufertigung?\r\n•\tIst das Bauteil standardisiert, zugekauft oder individuell ausgerichtet?\r\n•\tWelche primäre Funktion nimmt das Bauteil ein?\r\nDiese strukturierte Klassifizierung unterstützt die Entscheidungsfindung bereits früh im PEP. Sie ermöglicht es Produktentwickelnden, Potenziale für die Kreislaufwirtschaft frühzeitig zu erkennen und gezielt nachhaltige Maßnahmen zu ergreifen.\r\nDie entwickelte Methodik bildet somit eine Grundlage für die Integration kreislaufwirtschaftlicher Prinzipien in den Entwicklungsprozess. Insbesondere im Kontext moderner Anforderungen des Mobility Management zeigt sich ihr Potenzial, nachhaltige Innovationen gezielt zu fördern und die Umsetzung der Kreislaufwirtschaft in der industriellen Praxis zu erleichtern.","lang":"ger"}],"ddc":["620"],"language":[{"iso":"ger"}]},{"publication_status":"published","publication_identifier":{"issn":["1868-8969"],"isbn":["978-3-95977-360-7"]},"citation":{"apa":"Gerlach, R., von der Gracht, S., Hahn, C., Harbig, J., &#38; Kling, P. (2025). Symmetry Preservation in Swarms of Oblivious Robots with Limited  Visibility. In S. Bonomi, L. Galletta,  Etienne Rivière, &#38;  Valerio Schiavoni (Eds.), <i>28th International Conference on Principles of Distributed Systems (OPODIS 2024)</i> (Vol. 324). Schloss Dagstuhl -- Leibniz-Zentrum für Informatik. <a href=\"https://doi.org/10.4230/LIPIcs.OPODIS.2024.13\">https://doi.org/10.4230/LIPIcs.OPODIS.2024.13</a>","mla":"Gerlach, Raphael, et al. “Symmetry Preservation in Swarms of Oblivious Robots with Limited  Visibility.” <i>28th International Conference on Principles of Distributed Systems (OPODIS 2024)</i>, edited by Silvia Bonomi et al., vol. 324, Schloss Dagstuhl -- Leibniz-Zentrum für Informatik, 2025, doi:<a href=\"https://doi.org/10.4230/LIPIcs.OPODIS.2024.13\">10.4230/LIPIcs.OPODIS.2024.13</a>.","short":"R. Gerlach, S. von der Gracht, C. Hahn, J. Harbig, P. Kling, in: S. Bonomi, L. Galletta,  Etienne Rivière,  Valerio Schiavoni (Eds.), 28th International Conference on Principles of Distributed Systems (OPODIS 2024), Schloss Dagstuhl -- Leibniz-Zentrum für Informatik, 2025.","bibtex":"@inproceedings{Gerlach_von der Gracht_Hahn_Harbig_Kling_2025, series={Leibniz International Proceedings in Informatics (LIPIcs)}, title={Symmetry Preservation in Swarms of Oblivious Robots with Limited  Visibility}, volume={324}, DOI={<a href=\"https://doi.org/10.4230/LIPIcs.OPODIS.2024.13\">10.4230/LIPIcs.OPODIS.2024.13</a>}, booktitle={28th International Conference on Principles of Distributed Systems (OPODIS 2024)}, publisher={Schloss Dagstuhl -- Leibniz-Zentrum für Informatik}, author={Gerlach, Raphael and von der Gracht, Sören and Hahn, Christopher and Harbig, Jonas and Kling, Peter}, editor={Bonomi, Silvia and Galletta, Letterio and Rivière,  Etienne and Schiavoni,  Valerio}, year={2025}, collection={Leibniz International Proceedings in Informatics (LIPIcs)} }","ama":"Gerlach R, von der Gracht S, Hahn C, Harbig J, Kling P. Symmetry Preservation in Swarms of Oblivious Robots with Limited  Visibility. In: Bonomi S, Galletta L, Rivière  Etienne, Schiavoni  Valerio, eds. <i>28th International Conference on Principles of Distributed Systems (OPODIS 2024)</i>. Vol 324. Leibniz International Proceedings in Informatics (LIPIcs). Schloss Dagstuhl -- Leibniz-Zentrum für Informatik; 2025. doi:<a href=\"https://doi.org/10.4230/LIPIcs.OPODIS.2024.13\">10.4230/LIPIcs.OPODIS.2024.13</a>","chicago":"Gerlach, Raphael, Sören von der Gracht, Christopher Hahn, Jonas Harbig, and Peter Kling. “Symmetry Preservation in Swarms of Oblivious Robots with Limited  Visibility.” In <i>28th International Conference on Principles of Distributed Systems (OPODIS 2024)</i>, edited by Silvia Bonomi, Letterio Galletta,  Etienne Rivière, and  Valerio Schiavoni, Vol. 324. Leibniz International Proceedings in Informatics (LIPIcs). Schloss Dagstuhl -- Leibniz-Zentrum für Informatik, 2025. <a href=\"https://doi.org/10.4230/LIPIcs.OPODIS.2024.13\">https://doi.org/10.4230/LIPIcs.OPODIS.2024.13</a>.","ieee":"R. Gerlach, S. von der Gracht, C. Hahn, J. Harbig, and P. Kling, “Symmetry Preservation in Swarms of Oblivious Robots with Limited  Visibility,” in <i>28th International Conference on Principles of Distributed Systems (OPODIS 2024)</i>, Lucca, Italy, 2025, vol. 324, doi: <a href=\"https://doi.org/10.4230/LIPIcs.OPODIS.2024.13\">10.4230/LIPIcs.OPODIS.2024.13</a>."},"intvolume":"       324","author":[{"orcid":"0009-0002-4750-2051","last_name":"Gerlach","id":"32655","full_name":"Gerlach, Raphael","first_name":"Raphael"},{"first_name":"Sören","last_name":"von der Gracht","orcid":"0000-0002-8054-2058","full_name":"von der Gracht, Sören","id":"97359"},{"last_name":"Hahn","full_name":"Hahn, Christopher","first_name":"Christopher"},{"first_name":"Jonas","full_name":"Harbig, Jonas","id":"47213","last_name":"Harbig"},{"first_name":"Peter","last_name":"Kling","full_name":"Kling, Peter"}],"volume":324,"date_updated":"2025-01-09T11:39:19Z","oa":"1","main_file_link":[{"url":"https://arxiv.org/abs/2409.19277","open_access":"1"}],"conference":{"location":"Lucca, Italy","end_date":"2024-12-13","start_date":"2024-12-11","name":"28th International Conference on Principles of Distributed Systems (OPODIS 2024)"},"doi":"10.4230/LIPIcs.OPODIS.2024.13","type":"conference","status":"public","editor":[{"full_name":"Bonomi, Silvia","last_name":"Bonomi","first_name":"Silvia"},{"last_name":"Galletta","full_name":"Galletta, Letterio","first_name":"Letterio"},{"first_name":" Etienne","last_name":"Rivière","full_name":"Rivière,  Etienne"},{"full_name":"Schiavoni,  Valerio","last_name":"Schiavoni","first_name":" Valerio"}],"user_id":"97359","series_title":"Leibniz International Proceedings in Informatics (LIPIcs)","department":[{"_id":"101"}],"project":[{"grant_number":"453112019","name":"Algorithmen für Schwarmrobotik: Verteiltes Rechnen trifft Dynamische Systeme","_id":"106"}],"_id":"56298","year":"2025","date_created":"2024-10-01T13:29:43Z","publisher":"Schloss Dagstuhl -- Leibniz-Zentrum für Informatik","title":"Symmetry Preservation in Swarms of Oblivious Robots with Limited  Visibility","publication":"28th International Conference on Principles of Distributed Systems (OPODIS 2024)","abstract":[{"text":"In the general pattern formation (GPF) problem, a swarm of simple autonomous,\r\ndisoriented robots must form a given pattern. The robots' simplicity imply a\r\nstrong limitation: When the initial configuration is rotationally symmetric,\r\nonly patterns with a similar symmetry can be formed [Yamashita, Suzyuki; TCS\r\n2010]. The only known algorithm to form large patterns with limited visibility\r\nand without memory requires the robots to start in a near-gathering (a swarm of\r\nconstant diameter) [Hahn et al.; SAND 2024]. However, not only do we not know\r\nany near-gathering algorithm guaranteed to preserve symmetry but most natural\r\ngathering strategies trivially increase symmetries [Castenow et al.; OPODIS\r\n2022].\r\n  Thus, we study near-gathering without changing the swarm's rotational\r\nsymmetry for disoriented, oblivious robots with limited visibility (the\r\nOBLOT-model, see [Flocchini et al.; 2019]). We introduce a technique based on\r\nthe theory of dynamical systems to analyze how a given algorithm affects\r\nsymmetry and provide sufficient conditions for symmetry preservation. Until\r\nnow, it was unknown whether the considered OBLOT-model allows for any\r\nnon-trivial algorithm that always preserves symmetry. Our first result shows\r\nthat a variant of Go-to-the-Average always preserves symmetry but may sometimes\r\nlead to multiple, unconnected near-gathering clusters. Our second result is a\r\nsymmetry-preserving near-gathering algorithm that works on swarms with a convex\r\nboundary (the outer boundary of the unit disc graph) and without holes (circles\r\nof diameter 1 inside the boundary without any robots).","lang":"eng"}],"external_id":{"arxiv":["2409.19277"]},"language":[{"iso":"eng"}],"keyword":["Swarm Algorithm","Swarm Robots","Distributed Algorithm","Pattern Formation","Limited Visibility","Oblivious"]},{"has_accepted_license":"1","year":"2025","citation":{"short":"G. Schryen, M. Marrone, J. Yang, Electronic Markets (2025).","mla":"Schryen, Guido, et al. “Exploring the Scope of Generative AI in Literature Review Development.” <i>Electronic Markets</i>, 2025.","bibtex":"@article{Schryen_Marrone_Yang_2025, title={Exploring the Scope of Generative AI in Literature Review Development}, journal={Electronic Markets}, author={Schryen, Guido and Marrone, Mauricio and Yang, Jack}, year={2025} }","apa":"Schryen, G., Marrone, M., &#38; Yang, J. (2025). Exploring the Scope of Generative AI in Literature Review Development. <i>Electronic Markets</i>.","chicago":"Schryen, Guido, Mauricio Marrone, and Jack Yang. “Exploring the Scope of Generative AI in Literature Review Development.” <i>Electronic Markets</i>, 2025.","ieee":"G. Schryen, M. Marrone, and J. Yang, “Exploring the Scope of Generative AI in Literature Review Development,” <i>Electronic Markets</i>, 2025.","ama":"Schryen G, Marrone M, Yang J. Exploring the Scope of Generative AI in Literature Review Development. <i>Electronic Markets</i>. Published online 2025."},"oa":"1","date_updated":"2025-01-10T16:51:02Z","author":[{"last_name":"Schryen","id":"72850","full_name":"Schryen, Guido","first_name":"Guido"},{"first_name":"Mauricio","last_name":"Marrone","full_name":"Marrone, Mauricio"},{"full_name":"Yang, Jack","last_name":"Yang","first_name":"Jack"}],"date_created":"2025-01-10T15:13:23Z","title":"Exploring the Scope of Generative AI in Literature Review Development","publication":"Electronic Markets","type":"journal_article","status":"public","file":[{"date_created":"2025-01-10T16:50:54Z","creator":"mateskam","date_updated":"2025-01-10T16:50:54Z","access_level":"open_access","file_name":"Electronic Markets - Exploring the Scope of Generative AI in Literature Review Development - Preprint.pdf","file_id":"58152","file_size":4950416,"content_type":"application/pdf","relation":"main_file"}],"_id":"58150","department":[{"_id":"277"}],"user_id":"51811","ddc":["000"],"file_date_updated":"2025-01-10T16:50:54Z","language":[{"iso":"eng"}]},{"publication_status":"submitted","year":"2025","citation":{"apa":"Kopylov, D., Offen, C., Ares, L., Wembe Moafo, B. E., Ober-Blöbaum, S., Meier, T., Sharapova, P., &#38; Sperling, J. (n.d.). <i>Multiphoton, multimode state classification for nonlinear optical circuits </i>.","mla":"Kopylov, Denis, et al. <i>Multiphoton, Multimode State Classification for Nonlinear Optical Circuits </i>.","bibtex":"@article{Kopylov_Offen_Ares_Wembe Moafo_Ober-Blöbaum_Meier_Sharapova_Sperling, title={Multiphoton, multimode state classification for nonlinear optical circuits }, author={Kopylov, Denis and Offen, Christian and Ares, Laura and Wembe Moafo, Boris Edgar and Ober-Blöbaum, Sina and Meier, Torsten and Sharapova, Polina and Sperling, Jan} }","short":"D. Kopylov, C. Offen, L. Ares, B.E. Wembe Moafo, S. Ober-Blöbaum, T. Meier, P. Sharapova, J. Sperling, (n.d.).","chicago":"Kopylov, Denis, Christian Offen, Laura Ares, Boris Edgar Wembe Moafo, Sina Ober-Blöbaum, Torsten Meier, Polina Sharapova, and Jan Sperling. “Multiphoton, Multimode State Classification for Nonlinear Optical Circuits ,” n.d.","ieee":"D. Kopylov <i>et al.</i>, “Multiphoton, multimode state classification for nonlinear optical circuits .” .","ama":"Kopylov D, Offen C, Ares L, et al. Multiphoton, multimode state classification for nonlinear optical circuits ."},"date_updated":"2025-02-10T08:36:12Z","oa":"1","author":[{"first_name":"Denis","full_name":"Kopylov, Denis","id":"98502","last_name":"Kopylov"},{"first_name":"Christian","full_name":"Offen, Christian","id":"85279","orcid":"0000-0002-5940-8057","last_name":"Offen"},{"first_name":"Laura","last_name":"Ares","full_name":"Ares, Laura"},{"first_name":"Boris Edgar","last_name":"Wembe Moafo","full_name":"Wembe Moafo, Boris Edgar","id":"95394"},{"first_name":"Sina","id":"16494","full_name":"Ober-Blöbaum, Sina","last_name":"Ober-Blöbaum"},{"first_name":"Torsten","last_name":"Meier","orcid":"0000-0001-8864-2072","id":"344","full_name":"Meier, Torsten"},{"first_name":"Polina","last_name":"Sharapova","id":"60286","full_name":"Sharapova, Polina"},{"first_name":"Jan","orcid":"0000-0002-5844-3205","last_name":"Sperling","full_name":"Sperling, Jan","id":"75127"}],"date_created":"2025-02-10T08:26:45Z","title":"Multiphoton, multimode state classification for nonlinear optical circuits ","main_file_link":[{"open_access":"1","url":"https://doi.org/10.48550/arXiv.2502.05123"}],"type":"preprint","abstract":[{"lang":"eng","text":"We introduce a new classification of multimode states with a fixed number of photons. This classification is based on the factorizability of homogeneous multivariate polynomials and is invariant under unitary transformations. The classes physically correspond to field excitations in terms of single and multiple photons, each of which being in an arbitrary irreducible superposition of quantized modes. We further show how the transitions between classes are rendered possible by photon addition, photon subtraction, and photon-projection nonlinearities. We explicitly put forward a design for a multilayer interferometer in which the states for different classes can be generated with state-of-the-art experimental techniques. Limitations of the proposed designs are analyzed using the introduced classification, providing a benchmark for the robustness of certain states and classes. "}],"status":"public","_id":"58544","external_id":{"arxiv":["2502.05123"]},"user_id":"85279","department":[{"_id":"623"},{"_id":"15"},{"_id":"636"}],"language":[{"iso":"eng"}]}]