[{"date_created":"2026-05-08T12:51:23Z","type":"book_chapter","publication":"Schnittstelle Kunstunterricht: Skulptur - Material - Prozess","citation":{"ama":"Pauls K. Skulptur und Prozesse im Material. In: Pauls K, ed. <i>Schnittstelle Kunstunterricht: Skulptur - Material - Prozess</i>. ; 2024. doi:<a href=\"https://doi.org/10.3278/9783763977246\">10.3278/9783763977246</a>","bibtex":"@inbook{Pauls_2024, title={Skulptur und Prozesse im Material}, DOI={<a href=\"https://doi.org/10.3278/9783763977246\">10.3278/9783763977246</a>}, booktitle={Schnittstelle Kunstunterricht: Skulptur - Material - Prozess}, author={Pauls, Karina}, editor={Pauls, Karina}, year={2024} }","mla":"Pauls, Karina. “Skulptur und Prozesse im Material.” <i>Schnittstelle Kunstunterricht: Skulptur - Material - Prozess</i>, edited by Karina Pauls, 2024, doi:<a href=\"https://doi.org/10.3278/9783763977246\">10.3278/9783763977246</a>.","short":"K. Pauls, in: K. Pauls (Ed.), Schnittstelle Kunstunterricht: Skulptur - Material - Prozess, 2024.","chicago":"Pauls, Karina. “Skulptur und Prozesse im Material.” In <i>Schnittstelle Kunstunterricht: Skulptur - Material - Prozess</i>, edited by Karina Pauls, 2024. <a href=\"https://doi.org/10.3278/9783763977246\">https://doi.org/10.3278/9783763977246</a>.","apa":"Pauls, K. (2024). Skulptur und Prozesse im Material. In K. Pauls (Ed.), <i>Schnittstelle Kunstunterricht: Skulptur - Material - Prozess</i>. <a href=\"https://doi.org/10.3278/9783763977246\">https://doi.org/10.3278/9783763977246</a>","ieee":"K. Pauls, “Skulptur und Prozesse im Material,” in <i>Schnittstelle Kunstunterricht: Skulptur - Material - Prozess</i>, K. Pauls, Ed. 2024."},"_id":"65590","language":[{"iso":"ger"}],"doi":"10.3278/9783763977246","user_id":"78235","editor":[{"first_name":"Karina","last_name":"Pauls","full_name":"Pauls, Karina"}],"year":"2024","status":"public","title":"Skulptur und Prozesse im Material","publication_identifier":{"isbn":["9783763977253"]},"author":[{"id":"78235","full_name":"Pauls, Karina","last_name":"Pauls","first_name":"Karina"}],"date_updated":"2026-05-08T12:51:36Z","publication_status":"published"},{"language":[{"iso":"ger"}],"_id":"65591","user_id":"78235","editor":[{"last_name":"Pauls","first_name":"Karina","full_name":"Pauls, Karina"}],"status":"public","title":"Beispiel aus der Lehrpraxis: Keramik + X","year":"2024","author":[{"full_name":"Pauls, Karina","last_name":"Pauls","first_name":"Karina","id":"78235"}],"publication_identifier":{"isbn":["9783763977253"]},"date_updated":"2026-05-08T12:57:36Z","publication_status":"published","date_created":"2026-05-08T12:54:52Z","type":"book_chapter","publication":"Schnittstelle Kunstunterricht: Skulptur - Material - Prozess","citation":{"chicago":"Pauls, Karina. “Beispiel aus der Lehrpraxis: Keramik + X.” In <i>Schnittstelle Kunstunterricht: Skulptur - Material - Prozess</i>, edited by Karina Pauls, 2024.","short":"K. Pauls, in: K. Pauls (Ed.), Schnittstelle Kunstunterricht: Skulptur - Material - Prozess, 2024.","ama":"Pauls K. Beispiel aus der Lehrpraxis: Keramik + X. In: Pauls K, ed. <i>Schnittstelle Kunstunterricht: Skulptur - Material - Prozess</i>. ; 2024.","bibtex":"@inbook{Pauls_2024, title={Beispiel aus der Lehrpraxis: Keramik + X}, booktitle={Schnittstelle Kunstunterricht: Skulptur - Material - Prozess}, author={Pauls, Karina}, editor={Pauls, Karina}, year={2024} }","mla":"Pauls, Karina. “Beispiel aus der Lehrpraxis: Keramik + X.” <i>Schnittstelle Kunstunterricht: Skulptur - Material - Prozess</i>, edited by Karina Pauls, 2024.","apa":"Pauls, K. (2024). Beispiel aus der Lehrpraxis: Keramik + X. In K. Pauls (Ed.), <i>Schnittstelle Kunstunterricht: Skulptur - Material - Prozess</i>.","ieee":"K. Pauls, “Beispiel aus der Lehrpraxis: Keramik + X,” in <i>Schnittstelle Kunstunterricht: Skulptur - Material - Prozess</i>, K. Pauls, Ed. 2024."}},{"citation":{"ama":"Pauls K, ed. <i>Schnittstelle Kunstunterricht: Skulptur - Material - Prozess</i>.; 2024. doi:<a href=\"https://doi.org/10.3278/9783763977246\">10.3278/9783763977246</a>","bibtex":"@book{Pauls_2024, title={Schnittstelle Kunstunterricht: Skulptur - Material - Prozess}, DOI={<a href=\"https://doi.org/10.3278/9783763977246\">10.3278/9783763977246</a>}, year={2024} }","mla":"Pauls, Karina, editor. <i>Schnittstelle Kunstunterricht: Skulptur - Material - Prozess</i>. 2024, doi:<a href=\"https://doi.org/10.3278/9783763977246\">10.3278/9783763977246</a>.","short":"K. Pauls, ed., Schnittstelle Kunstunterricht: Skulptur - Material - Prozess, 2024.","chicago":"Pauls, Karina, ed. <i>Schnittstelle Kunstunterricht: Skulptur - Material - Prozess</i>, 2024. <a href=\"https://doi.org/10.3278/9783763977246\">https://doi.org/10.3278/9783763977246</a>.","apa":"Pauls, K. (Ed.). (2024). <i>Schnittstelle Kunstunterricht: Skulptur - Material - Prozess</i>. <a href=\"https://doi.org/10.3278/9783763977246\">https://doi.org/10.3278/9783763977246</a>","ieee":"K. Pauls, Ed., <i>Schnittstelle Kunstunterricht: Skulptur - Material - Prozess</i>. 2024."},"date_created":"2026-05-08T12:48:05Z","type":"book_editor","status":"public","title":"Schnittstelle Kunstunterricht: Skulptur - Material - Prozess","year":"2024","publication_identifier":{"isbn":["9783763977253"]},"publication_status":"published","date_updated":"2026-05-08T12:48:17Z","_id":"65589","language":[{"iso":"ger"}],"user_id":"78235","doi":"10.3278/9783763977246","editor":[{"last_name":"Pauls","first_name":"Karina","full_name":"Pauls, Karina"}]},{"language":[{"iso":"ger"}],"_id":"57860","main_file_link":[{"url":"https://blogs.uni-paderborn.de/zekkblog/2024/06/07/auf-der-suche-nach-frieden/"}],"user_id":"53425","author":[{"id":"53425","full_name":"Lebock, Sarah","last_name":"Lebock","first_name":"Sarah","orcid":"0009-0005-7485-1902"}],"year":"2024","title":"\"Auf der Suche nach Frieden\"","status":"public","date_updated":"2026-05-10T12:04:07Z","place":"BloKK-Beitrag für das ZeKK, 07.06.2024","date_created":"2024-12-24T02:26:31Z","department":[{"_id":"550"}],"type":"misc","citation":{"ieee":"S. Lebock, <i>“Auf der Suche nach Frieden.”</i> BloKK-Beitrag für das ZeKK, 07.06.2024, 2024.","apa":"Lebock, S. (2024). <i>“Auf der Suche nach Frieden.”</i>","mla":"Lebock, Sarah. <i>“Auf der Suche nach Frieden.”</i> 2024.","bibtex":"@book{Lebock_2024, place={BloKK-Beitrag für das ZeKK, 07.06.2024}, title={“Auf der Suche nach Frieden”}, author={Lebock, Sarah}, year={2024} }","ama":"Lebock S. <i>“Auf der Suche nach Frieden.”</i>; 2024.","short":"S. Lebock, “Auf der Suche nach Frieden,” BloKK-Beitrag für das ZeKK, 07.06.2024, 2024.","chicago":"Lebock, Sarah. <i>“Auf der Suche nach Frieden.”</i> BloKK-Beitrag für das ZeKK, 07.06.2024, 2024."},"abstract":[{"text":"BloKK-Beitrag für das ZeKK, 07.06.2024","lang":"eng"}]},{"date_updated":"2026-05-11T07:44:55Z","publication_status":"published","title":"Navigator Bildung Digitalisierung. Konzeptionierung und Orientierung zum Stand der digitalen Transformation im schulischen Bildungsbereich in Deutschland","year":"2024","status":"public","author":[{"full_name":"Eickelmann, Birgit","first_name":"Birgit","last_name":"Eickelmann","orcid":"0000-0001-6124-746X","id":"40387"},{"first_name":"Julia","last_name":"Gerick","full_name":"Gerick, Julia"},{"first_name":"Uta","last_name":"Hauck-Thum","full_name":"Hauck-Thum, Uta"},{"last_name":"Maaz","first_name":"Kai","full_name":"Maaz, Kai"}],"user_id":"40387","page":"139","main_file_link":[{"url":"https://www.forumbd.de/wp-content/uploads/2026/04/navigator-bildung-digitalisierung.pdf"}],"_id":"56078","language":[{"iso":"ger"}],"publisher":"Forum Bildung Digitalisierung e. V","citation":{"apa":"Eickelmann, B., Gerick, J., Hauck-Thum, U., &#38; Maaz, K. (2024). <i>Navigator Bildung Digitalisierung. Konzeptionierung und Orientierung zum Stand der digitalen Transformation im schulischen Bildungsbereich in Deutschland</i>. Forum Bildung Digitalisierung e. V.","mla":"Eickelmann, Birgit, et al. <i>Navigator Bildung Digitalisierung. Konzeptionierung und Orientierung zum Stand der digitalen Transformation im schulischen Bildungsbereich in Deutschland</i>. Forum Bildung Digitalisierung e. V, 2024.","ieee":"B. Eickelmann, J. Gerick, U. Hauck-Thum, and K. Maaz, <i>Navigator Bildung Digitalisierung. Konzeptionierung und Orientierung zum Stand der digitalen Transformation im schulischen Bildungsbereich in Deutschland</i>. Berlin: Forum Bildung Digitalisierung e. V, 2024.","chicago":"Eickelmann, Birgit, Julia Gerick, Uta Hauck-Thum, and Kai Maaz. <i>Navigator Bildung Digitalisierung. Konzeptionierung und Orientierung zum Stand der digitalen Transformation im schulischen Bildungsbereich in Deutschland</i>. Berlin: Forum Bildung Digitalisierung e. V, 2024.","short":"B. Eickelmann, J. Gerick, U. Hauck-Thum, K. Maaz, Navigator Bildung Digitalisierung. Konzeptionierung und Orientierung zum Stand der digitalen Transformation im schulischen Bildungsbereich in Deutschland, Forum Bildung Digitalisierung e. V, Berlin, 2024.","ama":"Eickelmann B, Gerick J, Hauck-Thum U, Maaz K. <i>Navigator Bildung Digitalisierung. Konzeptionierung und Orientierung zum Stand der digitalen Transformation im schulischen Bildungsbereich in Deutschland</i>. Forum Bildung Digitalisierung e. V; 2024.","bibtex":"@book{Eickelmann_Gerick_Hauck-Thum_Maaz_2024, place={Berlin}, title={Navigator Bildung Digitalisierung. Konzeptionierung und Orientierung zum Stand der digitalen Transformation im schulischen Bildungsbereich in Deutschland}, publisher={Forum Bildung Digitalisierung e. V}, author={Eickelmann, Birgit and Gerick, Julia and Hauck-Thum, Uta and Maaz, Kai}, year={2024} }"},"type":"book","department":[{"_id":"462"}],"place":"Berlin","date_created":"2024-09-06T06:41:07Z"},{"author":[{"id":"83141","first_name":"Thomas","last_name":"Borgert","full_name":"Borgert, Thomas"},{"id":"88725","full_name":"Nordieker, Ansgar Bernhard","last_name":"Nordieker","first_name":"Ansgar Bernhard"},{"full_name":"Homberg, Werner","first_name":"Werner","last_name":"Homberg","id":"233"}],"publication_identifier":{"issn":["2474-395X"]},"conference":{"location":"Toulouse","name":"ESAFORM 2024"},"title":"Form-based manufacturing of aluminium and steel auxiliary joining elements as the basis for an efficient joining operation","year":"2024","status":"public","publication_status":"published","date_updated":"2026-05-12T11:56:47Z","_id":"54650","language":[{"iso":"eng"}],"publisher":"Materials Research Forum LLC","user_id":"7850","doi":"10.21741/9781644903131-180","citation":{"mla":"Borgert, Thomas, et al. “Form-Based Manufacturing of Aluminium and Steel Auxiliary Joining Elements as the Basis for an Efficient Joining Operation.” <i>Materials Research Proceedings</i>, Materials Research Forum LLC, 2024, doi:<a href=\"https://doi.org/10.21741/9781644903131-180\">10.21741/9781644903131-180</a>.","ama":"Borgert T, Nordieker AB, Homberg W. Form-based manufacturing of aluminium and steel auxiliary joining elements as the basis for an efficient joining operation. In: <i>Materials Research Proceedings</i>. Materials Research Forum LLC; 2024. doi:<a href=\"https://doi.org/10.21741/9781644903131-180\">10.21741/9781644903131-180</a>","bibtex":"@inproceedings{Borgert_Nordieker_Homberg_2024, title={Form-based manufacturing of aluminium and steel auxiliary joining elements as the basis for an efficient joining operation}, DOI={<a href=\"https://doi.org/10.21741/9781644903131-180\">10.21741/9781644903131-180</a>}, booktitle={Materials Research Proceedings}, publisher={Materials Research Forum LLC}, author={Borgert, Thomas and Nordieker, Ansgar Bernhard and Homberg, Werner}, year={2024} }","apa":"Borgert, T., Nordieker, A. B., &#38; Homberg, W. (2024). Form-based manufacturing of aluminium and steel auxiliary joining elements as the basis for an efficient joining operation. <i>Materials Research Proceedings</i>. ESAFORM 2024, Toulouse. <a href=\"https://doi.org/10.21741/9781644903131-180\">https://doi.org/10.21741/9781644903131-180</a>","ieee":"T. Borgert, A. B. Nordieker, and W. Homberg, “Form-based manufacturing of aluminium and steel auxiliary joining elements as the basis for an efficient joining operation,” presented at the ESAFORM 2024, Toulouse, 2024, doi: <a href=\"https://doi.org/10.21741/9781644903131-180\">10.21741/9781644903131-180</a>.","chicago":"Borgert, Thomas, Ansgar Bernhard Nordieker, and Werner Homberg. “Form-Based Manufacturing of Aluminium and Steel Auxiliary Joining Elements as the Basis for an Efficient Joining Operation.” In <i>Materials Research Proceedings</i>. Materials Research Forum LLC, 2024. <a href=\"https://doi.org/10.21741/9781644903131-180\">https://doi.org/10.21741/9781644903131-180</a>.","short":"T. Borgert, A.B. Nordieker, W. Homberg, in: Materials Research Proceedings, Materials Research Forum LLC, 2024."},"publication":"Materials Research Proceedings","project":[{"name":"TRR 285 - Project Area C","_id":"133"},{"_id":"147","name":"TRR 285 - Subproject C03"},{"name":"TRR 285:  Methodenentwicklung zur mechanischen Fügbarkeit in wandlungsfähigen Prozessketten","_id":"130"}],"abstract":[{"lang":"eng","text":"<jats:p>Abstract. Reducing the weight of vehicles can significantly lower the energy or fuel consumed and thus the emissions during operation. One possibility to assess this is the use of a property adapted multi-material systems containing high strength steel, light metals like aluminium or magnesium and fibre reinforced plastics. While expanding the number of materials used new challenges arise for the production and furthermore the joining technology to manufacture the vehicle made of the multi-material systems. One approach to overcome these challenges is to use innovative and adaptable joining techniques which allows the manufacturing of joints of different material combinations. Extensive research activities on the two stage thermo-mechanical joining process with adaptable joining elements was able to demonstrate the great potentials in terms of joining dissimilar materials with good strength. The previously kinematic and path-based fabrication of auxiliary joining elements is modified in this publication to a form-based approach with a perspective of establishing an efficient process chain using easily and cheaply available rods. Based on the new approach to produce the auxiliary joining elements, it can be demonstrated that a reproducible production of the geometry is possible for the investigated steel as well as aluminium material. </jats:p>"}],"date_created":"2024-06-07T09:38:45Z","department":[{"_id":"156"}],"type":"conference"},{"project":[{"_id":"133","name":"TRR 285 - Project Area C"},{"_id":"147","name":"TRR 285 - Subproject C03"},{"_id":"130","name":"TRR 285:  Methodenentwicklung zur mechanischen Fügbarkeit in wandlungsfähigen Prozessketten"}],"citation":{"bibtex":"@article{Borgert_Nordieker_Wiens_Homberg_2024, title={Investigations to improve the tool life during thermomechanical and incremental forming of steel auxiliary joining elements}, volume={9}, DOI={<a href=\"https://doi.org/10.1016/j.jajp.2024.100185\">10.1016/j.jajp.2024.100185</a>}, number={100185}, journal={Journal of Advanced Joining Processes}, publisher={Elsevier BV}, author={Borgert, Thomas and Nordieker, Ansgar Bernhard and Wiens, Eugen and Homberg, Werner}, year={2024} }","chicago":"Borgert, Thomas, Ansgar Bernhard Nordieker, Eugen Wiens, and Werner Homberg. “Investigations to Improve the Tool Life during Thermomechanical and Incremental Forming of Steel Auxiliary Joining Elements.” <i>Journal of Advanced Joining Processes</i> 9 (2024). <a href=\"https://doi.org/10.1016/j.jajp.2024.100185\">https://doi.org/10.1016/j.jajp.2024.100185</a>.","short":"T. Borgert, A.B. Nordieker, E. Wiens, W. Homberg, Journal of Advanced Joining Processes 9 (2024).","ama":"Borgert T, Nordieker AB, Wiens E, Homberg W. Investigations to improve the tool life during thermomechanical and incremental forming of steel auxiliary joining elements. <i>Journal of Advanced Joining Processes</i>. 2024;9. doi:<a href=\"https://doi.org/10.1016/j.jajp.2024.100185\">10.1016/j.jajp.2024.100185</a>","ieee":"T. Borgert, A. B. Nordieker, E. Wiens, and W. Homberg, “Investigations to improve the tool life during thermomechanical and incremental forming of steel auxiliary joining elements,” <i>Journal of Advanced Joining Processes</i>, vol. 9, Art. no. 100185, 2024, doi: <a href=\"https://doi.org/10.1016/j.jajp.2024.100185\">10.1016/j.jajp.2024.100185</a>.","mla":"Borgert, Thomas, et al. “Investigations to Improve the Tool Life during Thermomechanical and Incremental Forming of Steel Auxiliary Joining Elements.” <i>Journal of Advanced Joining Processes</i>, vol. 9, 100185, Elsevier BV, 2024, doi:<a href=\"https://doi.org/10.1016/j.jajp.2024.100185\">10.1016/j.jajp.2024.100185</a>.","apa":"Borgert, T., Nordieker, A. B., Wiens, E., &#38; Homberg, W. (2024). Investigations to improve the tool life during thermomechanical and incremental forming of steel auxiliary joining elements. <i>Journal of Advanced Joining Processes</i>, <i>9</i>, Article 100185. <a href=\"https://doi.org/10.1016/j.jajp.2024.100185\">https://doi.org/10.1016/j.jajp.2024.100185</a>"},"volume":9,"user_id":"7850","publisher":"Elsevier BV","_id":"54649","status":"public","department":[{"_id":"156"}],"type":"journal_article","date_created":"2024-06-07T09:31:59Z","publication":"Journal of Advanced Joining Processes","doi":"10.1016/j.jajp.2024.100185","language":[{"iso":"eng"}],"article_number":"100185","intvolume":"         9","date_updated":"2026-05-12T11:56:15Z","publication_status":"published","publication_identifier":{"issn":["2666-3309"]},"author":[{"full_name":"Borgert, Thomas","first_name":"Thomas","last_name":"Borgert","id":"83141"},{"full_name":"Nordieker, Ansgar Bernhard","first_name":"Ansgar Bernhard","last_name":"Nordieker","id":"88725"},{"full_name":"Wiens, Eugen","last_name":"Wiens","first_name":"Eugen","id":"7888"},{"last_name":"Homberg","first_name":"Werner","full_name":"Homberg, Werner","id":"233"}],"title":"Investigations to improve the tool life during thermomechanical and incremental forming of steel auxiliary joining elements","year":"2024"},{"date_created":"2025-10-13T15:16:18Z","type":"conference","citation":{"apa":"Hollmer, K., Kuczyk, M., Friedlein, J., Mergheim, J., Steinmann, P., &#38; Zimmermann, M. (2024). <i>Charakterisierung des Verformungszustandes gleichartiger Stahl-Stahl-Clinchverbindungen durch Anwendung quantitativer Bildanalyse </i>.","ieee":"K. Hollmer, M. Kuczyk, J. Friedlein, J. Mergheim, P. Steinmann, and M. Zimmermann, “Charakterisierung des Verformungszustandes gleichartiger Stahl-Stahl-Clinchverbindungen durch Anwendung quantitativer Bildanalyse ,” 2024.","chicago":"Hollmer, Katharina, Martin Kuczyk, Johannes Friedlein, Julia Mergheim, Paul Steinmann, and Martina Zimmermann. “Charakterisierung Des Verformungszustandes Gleichartiger Stahl-Stahl-Clinchverbindungen Durch Anwendung Quantitativer Bildanalyse ,” 2024.","short":"K. Hollmer, M. Kuczyk, J. Friedlein, J. Mergheim, P. Steinmann, M. Zimmermann, in: 2024.","mla":"Hollmer, Katharina, et al. <i>Charakterisierung Des Verformungszustandes Gleichartiger Stahl-Stahl-Clinchverbindungen Durch Anwendung Quantitativer Bildanalyse </i>. 2024.","ama":"Hollmer K, Kuczyk M, Friedlein J, Mergheim J, Steinmann P, Zimmermann M. Charakterisierung des Verformungszustandes gleichartiger Stahl-Stahl-Clinchverbindungen durch Anwendung quantitativer Bildanalyse . In: ; 2024.","bibtex":"@inproceedings{Hollmer_Kuczyk_Friedlein_Mergheim_Steinmann_Zimmermann_2024, title={Charakterisierung des Verformungszustandes gleichartiger Stahl-Stahl-Clinchverbindungen durch Anwendung quantitativer Bildanalyse }, author={Hollmer, Katharina and Kuczyk, Martin and Friedlein, Johannes and Mergheim, Julia and Steinmann, Paul and Zimmermann, Martina}, year={2024} }"},"project":[{"_id":"130","name":"TRR 285:  Methodenentwicklung zur mechanischen Fügbarkeit in wandlungsfähigen Prozessketten"},{"_id":"141","name":"TRR 285 - Subproject B02"},{"name":"TRR 285 - Subproject A05","_id":"139"},{"name":"TRR 285 - Project Area B","_id":"132"},{"name":"TRR 285 - Project Area A","_id":"131"}],"language":[{"iso":"eng"}],"_id":"61797","user_id":"7850","author":[{"id":"104582","full_name":"Hollmer, Katharina","last_name":"Hollmer","first_name":"Katharina"},{"full_name":"Kuczyk, Martin","last_name":"Kuczyk","first_name":"Martin"},{"full_name":"Friedlein, Johannes","first_name":"Johannes","last_name":"Friedlein"},{"full_name":"Mergheim, Julia","first_name":"Julia","last_name":"Mergheim"},{"full_name":"Steinmann, Paul","first_name":"Paul","last_name":"Steinmann"},{"last_name":"Zimmermann","first_name":"Martina","full_name":"Zimmermann, Martina"}],"year":"2024","title":"Charakterisierung des Verformungszustandes gleichartiger Stahl-Stahl-Clinchverbindungen durch Anwendung quantitativer Bildanalyse ","status":"public","date_updated":"2026-05-12T13:30:16Z"},{"author":[{"id":"104468","first_name":"Stephan","last_name":"Lüder","orcid":"https://orcid.org/0000-0002-9086-3031","full_name":"Lüder, Stephan"},{"full_name":"Kalich, Jan","last_name":"Kalich","first_name":"Jan"},{"full_name":"Oesterle, Hannes","first_name":"Hannes","last_name":"Oesterle"},{"last_name":"Schmale","first_name":"Hans Christian","full_name":"Schmale, Hans Christian"}],"publication_identifier":{"isbn":["978-3-941269-97-2"]},"corporate_editor":["Stahlinstitut VDEh"],"year":"2024","title":"Prozessüberwachte Eigenschaftseinstellung beim Clinchen der ausscheidungshärtbaren Aluminiumlegierung EN AW-6014","publication_status":"published","date_updated":"2026-05-12T13:37:10Z","language":[{"iso":"ger"}],"publication":"Tagung Werkstoffprüfung 2024: Werkstoffe und Bauteile auf dem Prüfstand, Prüftechnik – Kennwertermittlung – Schadensvermeidung","extern":"1","abstract":[{"text":"Die Wandlungsfähigkeit einer Prozesskette erfordert Fügeverbindungen mit gezielt einstellbaren mechanischen, elektrischen, thermischen oder chemischen Eigenschaften. Dieser Beitrag beschreibt die Untersuchungen, inwiefern beim Clinchen zweier Bleche aus der ausscheidungshärtbaren Aluminiumlegierung EN AW-6014 bereits auf Basis der Prozessüberwachung des Kraft-Weg-Verlaufs bzw. des sich daraus ergebenden Energieeintrags auf die mechanischen und elektrischen Eigenschaften der Fügeverbindung geschlossen werden kann. An einer ausgewählten Fügeaufgabe werden im Stufenversuch die gegenseitigen Abhängigkeiten der einzelnen Einflussgrößen sowie des Wärmebehandlungszustands aufgezeigt. Dabei wird zwischen den Bindemechanismen Formschluss und Kraftschluss unterschieden. Die Formschlusskomponente wird anhand der geometrischen Kenngrößen wie Bodendicke, Halsdicke und Hinterschnitt in Mikroskopieuntersuchungen an Schliffbildern und den mechanischen Eigenschaften der Fügeverbindung untersucht, die im Scherzug- und Kopfzugversuch bestimmt werden. Dazu erfolgt zudem die Charakterisierung der Versagensbilder. Zur Quantifizierung der Kraftschlusskomponente der Fügeverbindung werden das Losbrechmoment im Torsionsversuch und der elektrische Widerstand mittels Vier-Leiter-Methode ermittelt und korreliert.","lang":"ger"}],"date_created":"2025-07-18T09:01:25Z","department":[{"_id":"630"}],"keyword":["Clinchen","Aluminium","Stufensetzversuch","Bindemechanismus","Formschluss","Kraftschluss","Zugversuch","Torsionsversuch","Widerstandsmessung"],"type":"conference","conference":{"end_date":"2024-12-06","location":"Krefeld","name":"Tagung Werkstoffprüfung 2024","start_date":"2024-12-05"},"status":"public","_id":"60645","page":"205-210","editor":[{"first_name":"Ulrich","last_name":"Krupp","full_name":"Krupp, Ulrich"},{"first_name":"Ingo","last_name":"Steller","full_name":"Steller, Ingo"}],"user_id":"7850","citation":{"bibtex":"@inproceedings{Lüder_Kalich_Oesterle_Schmale_2024, place={Düsseldorf}, title={Prozessüberwachte Eigenschaftseinstellung beim Clinchen der ausscheidungshärtbaren Aluminiumlegierung EN AW-6014}, booktitle={Tagung Werkstoffprüfung 2024: Werkstoffe und Bauteile auf dem Prüfstand, Prüftechnik – Kennwertermittlung – Schadensvermeidung}, author={Lüder, Stephan and Kalich, Jan and Oesterle, Hannes and Schmale, Hans Christian}, editor={Krupp, Ulrich and Steller, Ingo and Stahlinstitut VDEh}, year={2024}, pages={205–210} }","ama":"Lüder S, Kalich J, Oesterle H, Schmale HC. Prozessüberwachte Eigenschaftseinstellung beim Clinchen der ausscheidungshärtbaren Aluminiumlegierung EN AW-6014. In: Krupp U, Steller I, Stahlinstitut VDEh, eds. <i>Tagung Werkstoffprüfung 2024: Werkstoffe und Bauteile auf dem Prüfstand, Prüftechnik – Kennwertermittlung – Schadensvermeidung</i>. ; 2024:205-210.","mla":"Lüder, Stephan, et al. “Prozessüberwachte Eigenschaftseinstellung beim Clinchen der ausscheidungshärtbaren Aluminiumlegierung EN AW-6014.” <i>Tagung Werkstoffprüfung 2024: Werkstoffe und Bauteile auf dem Prüfstand, Prüftechnik – Kennwertermittlung – Schadensvermeidung</i>, edited by Ulrich Krupp et al., 2024, pp. 205–10.","short":"S. Lüder, J. Kalich, H. Oesterle, H.C. Schmale, in: U. Krupp, I. Steller, Stahlinstitut VDEh (Eds.), Tagung Werkstoffprüfung 2024: Werkstoffe und Bauteile auf dem Prüfstand, Prüftechnik – Kennwertermittlung – Schadensvermeidung, Düsseldorf, 2024, pp. 205–210.","chicago":"Lüder, Stephan, Jan Kalich, Hannes Oesterle, and Hans Christian Schmale. “Prozessüberwachte Eigenschaftseinstellung beim Clinchen der ausscheidungshärtbaren Aluminiumlegierung EN AW-6014.” In <i>Tagung Werkstoffprüfung 2024: Werkstoffe und Bauteile auf dem Prüfstand, Prüftechnik – Kennwertermittlung – Schadensvermeidung</i>, edited by Ulrich Krupp, Ingo Steller, and Stahlinstitut VDEh, 205–10. Düsseldorf, 2024.","ieee":"S. Lüder, J. Kalich, H. Oesterle, and H. C. Schmale, “Prozessüberwachte Eigenschaftseinstellung beim Clinchen der ausscheidungshärtbaren Aluminiumlegierung EN AW-6014,” in <i>Tagung Werkstoffprüfung 2024: Werkstoffe und Bauteile auf dem Prüfstand, Prüftechnik – Kennwertermittlung – Schadensvermeidung</i>, Krefeld, 2024, pp. 205–210.","apa":"Lüder, S., Kalich, J., Oesterle, H., &#38; Schmale, H. C. (2024). Prozessüberwachte Eigenschaftseinstellung beim Clinchen der ausscheidungshärtbaren Aluminiumlegierung EN AW-6014. In U. Krupp, I. Steller, &#38; Stahlinstitut VDEh (Eds.), <i>Tagung Werkstoffprüfung 2024: Werkstoffe und Bauteile auf dem Prüfstand, Prüftechnik – Kennwertermittlung – Schadensvermeidung</i> (pp. 205–210)."},"project":[{"name":"TRR 285 - A: TRR 285 - Project Area A","_id":"131"},{"_id":"138","name":"TRR 285 – A04: TRR 285 - Subproject A04"},{"_id":"130","name":"TRR 285:  Methodenentwicklung zur mechanischen Fügbarkeit in wandlungsfähigen Prozessketten"}],"quality_controlled":"1","place":"Düsseldorf"},{"date_created":"2024-12-11T14:45:57Z","department":[{"_id":"157"}],"type":"journal_article","citation":{"bibtex":"@article{Böhnke_Bielak_Beck_Bobbert_Meschut_2024, title={Development of a friction model for the numerical simulation of clinching processes}, DOI={<a href=\"https://doi.org/10.26599/frict.2025.9441052\">10.26599/frict.2025.9441052</a>}, journal={Friction}, publisher={Tsinghua University Press}, author={Böhnke, Max and Bielak, Christian Roman and Beck, Robert and Bobbert, Mathias and Meschut, Gerson}, year={2024} }","ama":"Böhnke M, Bielak CR, Beck R, Bobbert M, Meschut G. Development of a friction model for the numerical simulation of clinching processes. <i>Friction</i>. Published online 2024. doi:<a href=\"https://doi.org/10.26599/frict.2025.9441052\">10.26599/frict.2025.9441052</a>","mla":"Böhnke, Max, et al. “Development of a Friction Model for the Numerical Simulation of Clinching Processes.” <i>Friction</i>, Tsinghua University Press, 2024, doi:<a href=\"https://doi.org/10.26599/frict.2025.9441052\">10.26599/frict.2025.9441052</a>.","chicago":"Böhnke, Max, Christian Roman Bielak, Robert Beck, Mathias Bobbert, and Gerson Meschut. “Development of a Friction Model for the Numerical Simulation of Clinching Processes.” <i>Friction</i>, 2024. <a href=\"https://doi.org/10.26599/frict.2025.9441052\">https://doi.org/10.26599/frict.2025.9441052</a>.","short":"M. Böhnke, C.R. Bielak, R. Beck, M. Bobbert, G. Meschut, Friction (2024).","ieee":"M. Böhnke, C. R. Bielak, R. Beck, M. Bobbert, and G. Meschut, “Development of a friction model for the numerical simulation of clinching processes,” <i>Friction</i>, 2024, doi: <a href=\"https://doi.org/10.26599/frict.2025.9441052\">10.26599/frict.2025.9441052</a>.","apa":"Böhnke, M., Bielak, C. R., Beck, R., Bobbert, M., &#38; Meschut, G. (2024). Development of a friction model for the numerical simulation of clinching processes. <i>Friction</i>. <a href=\"https://doi.org/10.26599/frict.2025.9441052\">https://doi.org/10.26599/frict.2025.9441052</a>"},"publication":"Friction","project":[{"_id":"131","name":"TRR 285 - A: TRR 285 - Project Area A"},{"name":"TRR 285 – A01: TRR 285 - Subproject A01","_id":"135"},{"_id":"130","name":"TRR 285:  Methodenentwicklung zur mechanischen Fügbarkeit in wandlungsfähigen Prozessketten"}],"quality_controlled":"1","_id":"57742","publisher":"Tsinghua University Press","language":[{"iso":"eng"}],"user_id":"7850","doi":"10.26599/frict.2025.9441052","publication_identifier":{"issn":["2223-7690","2223-7704"]},"author":[{"first_name":"Max","last_name":"Böhnke","full_name":"Böhnke, Max","id":"45779"},{"first_name":"Christian Roman","last_name":"Bielak","full_name":"Bielak, Christian Roman","id":"34782"},{"full_name":"Beck, Robert","first_name":"Robert","last_name":"Beck","orcid":"0000-0001-9056-4528","id":"38279"},{"id":"7850","first_name":"Mathias","last_name":"Bobbert","full_name":"Bobbert, Mathias"},{"id":"32056","full_name":"Meschut, Gerson","first_name":"Gerson","orcid":"0000-0002-2763-1246","last_name":"Meschut"}],"title":"Development of a friction model for the numerical simulation of clinching processes","status":"public","year":"2024","article_type":"original","publication_status":"published","date_updated":"2026-05-12T14:08:38Z"},{"volume":8,"user_id":"61977","_id":"59585","publisher":"MDPI AG","status":"public","project":[{"_id":"131","name":"TRR 285 - A: TRR 285 - Project Area A"},{"name":"TRR 285 – A01: TRR 285 - Subproject A01","_id":"135"},{"_id":"130","name":"TRR 285:  Methodenentwicklung zur mechanischen Fügbarkeit in wandlungsfähigen Prozessketten"}],"quality_controlled":"1","citation":{"ama":"Friedlein J, Böhnke M, Schlichter MC, et al. Material Parameter Identification for a Stress-State-Dependent Ductile Damage and Failure Model Applied to Clinch Joining. <i>Journal of Manufacturing and Materials Processing</i>. 2024;8(4). doi:<a href=\"https://doi.org/10.3390/jmmp8040157\">10.3390/jmmp8040157</a>","bibtex":"@article{Friedlein_Böhnke_Schlichter_Bobbert_Meschut_Mergheim_Steinmann_2024, title={Material Parameter Identification for a Stress-State-Dependent Ductile Damage and Failure Model Applied to Clinch Joining}, volume={8}, DOI={<a href=\"https://doi.org/10.3390/jmmp8040157\">10.3390/jmmp8040157</a>}, number={4157}, journal={Journal of Manufacturing and Materials Processing}, publisher={MDPI AG}, author={Friedlein, Johannes and Böhnke, Max and Schlichter, Malte Christian and Bobbert, Mathias and Meschut, Gerson and Mergheim, Julia and Steinmann, Paul}, year={2024} }","mla":"Friedlein, Johannes, et al. “Material Parameter Identification for a Stress-State-Dependent Ductile Damage and Failure Model Applied to Clinch Joining.” <i>Journal of Manufacturing and Materials Processing</i>, vol. 8, no. 4, 157, MDPI AG, 2024, doi:<a href=\"https://doi.org/10.3390/jmmp8040157\">10.3390/jmmp8040157</a>.","short":"J. Friedlein, M. Böhnke, M.C. Schlichter, M. Bobbert, G. Meschut, J. Mergheim, P. Steinmann, Journal of Manufacturing and Materials Processing 8 (2024).","chicago":"Friedlein, Johannes, Max Böhnke, Malte Christian Schlichter, Mathias Bobbert, Gerson Meschut, Julia Mergheim, and Paul Steinmann. “Material Parameter Identification for a Stress-State-Dependent Ductile Damage and Failure Model Applied to Clinch Joining.” <i>Journal of Manufacturing and Materials Processing</i> 8, no. 4 (2024). <a href=\"https://doi.org/10.3390/jmmp8040157\">https://doi.org/10.3390/jmmp8040157</a>.","apa":"Friedlein, J., Böhnke, M., Schlichter, M. C., Bobbert, M., Meschut, G., Mergheim, J., &#38; Steinmann, P. (2024). Material Parameter Identification for a Stress-State-Dependent Ductile Damage and Failure Model Applied to Clinch Joining. <i>Journal of Manufacturing and Materials Processing</i>, <i>8</i>(4), Article 157. <a href=\"https://doi.org/10.3390/jmmp8040157\">https://doi.org/10.3390/jmmp8040157</a>","ieee":"J. Friedlein <i>et al.</i>, “Material Parameter Identification for a Stress-State-Dependent Ductile Damage and Failure Model Applied to Clinch Joining,” <i>Journal of Manufacturing and Materials Processing</i>, vol. 8, no. 4, Art. no. 157, 2024, doi: <a href=\"https://doi.org/10.3390/jmmp8040157\">10.3390/jmmp8040157</a>."},"doi":"10.3390/jmmp8040157","language":[{"iso":"eng"}],"article_number":"157","intvolume":"         8","publication_status":"published","date_updated":"2026-05-13T13:53:29Z","author":[{"full_name":"Friedlein, Johannes","first_name":"Johannes","last_name":"Friedlein"},{"id":"45779","first_name":"Max","last_name":"Böhnke","full_name":"Böhnke, Max"},{"id":"61977","full_name":"Schlichter, Malte Christian","last_name":"Schlichter","first_name":"Malte Christian"},{"id":"7850","full_name":"Bobbert, Mathias","first_name":"Mathias","last_name":"Bobbert"},{"id":"32056","full_name":"Meschut, Gerson","last_name":"Meschut","orcid":"0000-0002-2763-1246","first_name":"Gerson"},{"first_name":"Julia","last_name":"Mergheim","full_name":"Mergheim, Julia"},{"full_name":"Steinmann, Paul","last_name":"Steinmann","first_name":"Paul"}],"publication_identifier":{"issn":["2504-4494"]},"year":"2024","title":"Material Parameter Identification for a Stress-State-Dependent Ductile Damage and Failure Model Applied to Clinch Joining","department":[{"_id":"157"}],"type":"journal_article","date_created":"2025-04-15T11:07:52Z","abstract":[{"text":"Similar to bulk metal forming, clinch joining is characterised by large plastic deformations and a variety of different 3D stress states, including severe compression. However, inherent to plastic forming is the nucleation and growth of defects, whose detrimental effects on the material behaviour can be described by continuum damage models and eventually lead to material failure. As the damage evolution strongly depends on the stress state, a stress-state-dependent model is utilised to correctly track the accumulation. To formulate and parameterise this model, besides classical experiments, so-called modified punch tests are also integrated herein to enhance the calibration of the failure model by capturing a larger range of stress states and metal-forming-specific loading conditions. Moreover, when highly ductile materials are considered, such as the dual-phase steel HCT590X and the aluminium alloy EN AW-6014 T4 investigated here, strong necking and localisation might occur prior to fracture. This can alter the stress state and affect the actual strain at failure. This influence is captured by coupling plasticity and damage to incorporate the damage-induced softening effect. Its relative importance is shown by conducting inverse parameter identifications to determine damage and failure parameters for both mentioned ductile metals based on up to 12 different experiments.","lang":"eng"}],"issue":"4","publication":"Journal of Manufacturing and Materials Processing"},{"date_created":"2025-01-16T14:17:38Z","type":"book_editor","citation":{"mla":"Bürgel, Christoph, et al., editors. <i>\tZeitschrift Für Romanische Sprachen Und Ihre Didaktik</i>. 2024.","ama":"Bürgel C, Heiderich J, Koch C, Schlaak C, Visser J, eds. <i>\tZeitschrift Für Romanische Sprachen Und Ihre Didaktik</i>. Vol Heft 18,1.; 2024.","bibtex":"@book{Bürgel_Heiderich_Koch_Schlaak_Visser_2024, series={Zeitschrift für Romanische Sprachen und ihre Didaktik}, title={\tZeitschrift für Romanische Sprachen und ihre Didaktik}, volume={Heft 18,1}, year={2024}, collection={Zeitschrift für Romanische Sprachen und ihre Didaktik} }","apa":"Bürgel, C., Heiderich, J., Koch, C., Schlaak, C., &#38; Visser, J. (Eds.). (2024). <i>\tZeitschrift für Romanische Sprachen und ihre Didaktik: Vol. Heft 18,1</i>.","ieee":"C. Bürgel, J. Heiderich, C. Koch, C. Schlaak, and J. Visser, Eds., <i>\tZeitschrift für Romanische Sprachen und ihre Didaktik</i>, vol. Heft 18,1. 2024.","short":"C. Bürgel, J. Heiderich, C. Koch, C. Schlaak, J. Visser, eds., \tZeitschrift Für Romanische Sprachen Und Ihre Didaktik, 2024.","chicago":"Bürgel, Christoph, Jens  Heiderich, Corinna Koch, Claudia Schlaak, and Judith Visser, eds. <i>\tZeitschrift Für Romanische Sprachen Und Ihre Didaktik</i>. Vol. Heft 18,1. Zeitschrift Für Romanische Sprachen Und Ihre Didaktik, 2024."},"_id":"58215","language":[{"iso":"eng"}],"series_title":"Zeitschrift für Romanische Sprachen und ihre Didaktik","main_file_link":[{"url":"Paderborn"}],"volume":"Heft 18,1","editor":[{"id":"58448","first_name":"Christoph","last_name":"Bürgel","full_name":"Bürgel, Christoph"},{"last_name":"Heiderich","first_name":"Jens ","full_name":"Heiderich, Jens "},{"full_name":"Koch, Corinna","last_name":"Koch","first_name":"Corinna"},{"full_name":"Schlaak, Claudia","first_name":"Claudia","last_name":"Schlaak"},{"full_name":"Visser, Judith","last_name":"Visser","first_name":"Judith"}],"user_id":"43976","status":"public","year":"2024","title":"\tZeitschrift für Romanische Sprachen und ihre Didaktik","date_updated":"2026-05-13T13:47:37Z"},{"title":"Zeitschrift für Romanische Sprachen und ihre Didaktik","status":"public","year":"2024","date_updated":"2026-05-13T13:50:43Z","language":[{"iso":"eng"}],"_id":"65622","user_id":"43976","volume":"18,2","editor":[{"full_name":"Bürgel, Christoph","first_name":"Christoph","last_name":"Bürgel","id":"58448"},{"first_name":"Jens","last_name":"Heiderich","full_name":"Heiderich, Jens"},{"full_name":"Koch, Corinna","last_name":"Koch","first_name":"Corinna"},{"full_name":"Schlaak, Claudia","first_name":"Claudia","last_name":"Schlaak"},{"last_name":"Visser","first_name":"Judith","full_name":"Visser, Judith"}],"citation":{"ama":"Bürgel C, Heiderich J, Koch C, Schlaak C, Visser J, eds. <i>Zeitschrift Für Romanische Sprachen Und Ihre Didaktik</i>. Vol 18,2.; 2024.","bibtex":"@book{Bürgel_Heiderich_Koch_Schlaak_Visser_2024, title={Zeitschrift für Romanische Sprachen und ihre Didaktik}, volume={18,2}, year={2024} }","mla":"Bürgel, Christoph, et al., editors. <i>Zeitschrift Für Romanische Sprachen Und Ihre Didaktik</i>. 2024.","short":"C. Bürgel, J. Heiderich, C. Koch, C. Schlaak, J. Visser, eds., Zeitschrift Für Romanische Sprachen Und Ihre Didaktik, 2024.","chicago":"Bürgel, Christoph, Jens Heiderich, Corinna Koch, Claudia Schlaak, and Judith Visser, eds. <i>Zeitschrift Für Romanische Sprachen Und Ihre Didaktik</i>. Vol. 18,2, 2024.","apa":"Bürgel, C., Heiderich, J., Koch, C., Schlaak, C., &#38; Visser, J. (Eds.). (2024). <i>Zeitschrift für Romanische Sprachen und ihre Didaktik: Vol. 18,2</i>.","ieee":"C. Bürgel, J. Heiderich, C. Koch, C. Schlaak, and J. Visser, Eds., <i>Zeitschrift für Romanische Sprachen und ihre Didaktik</i>, vol. 18,2. 2024."},"date_created":"2026-05-13T13:42:23Z","type":"book_editor"},{"citation":{"mla":"Agarwal, Avantika, et al. “Quantum Polynomial Hierarchies: Karp-Lipton, Error Reduction, and Lower  Bounds.” <i>Proceedings of 49th International Symposium on Mathematical Foundations of Computer Science (MFCS)</i>, vol. 306, no. 7, 2024, pp. 7–17, doi:<a href=\"https://doi.org/10.4230/LIPIcs.MFCS.2024.7\">10.4230/LIPIcs.MFCS.2024.7</a>.","bibtex":"@inproceedings{Agarwal_Gharibian_Koppula_Rudolph_2024, title={Quantum Polynomial Hierarchies: Karp-Lipton, error reduction, and lower  bounds}, volume={306}, DOI={<a href=\"https://doi.org/10.4230/LIPIcs.MFCS.2024.7\">10.4230/LIPIcs.MFCS.2024.7</a>}, number={7}, booktitle={Proceedings of 49th International Symposium on Mathematical Foundations of Computer Science (MFCS)}, author={Agarwal, Avantika and Gharibian, Sevag and Koppula, Venkata and Rudolph, Dorian}, year={2024}, pages={7–17} }","ama":"Agarwal A, Gharibian S, Koppula V, Rudolph D. Quantum Polynomial Hierarchies: Karp-Lipton, error reduction, and lower  bounds. In: <i>Proceedings of 49th International Symposium on Mathematical Foundations of Computer Science (MFCS)</i>. Vol 306. ; 2024:7-17. doi:<a href=\"https://doi.org/10.4230/LIPIcs.MFCS.2024.7\">10.4230/LIPIcs.MFCS.2024.7</a>","ieee":"A. Agarwal, S. Gharibian, V. Koppula, and D. Rudolph, “Quantum Polynomial Hierarchies: Karp-Lipton, error reduction, and lower  bounds,” in <i>Proceedings of 49th International Symposium on Mathematical Foundations of Computer Science (MFCS)</i>, 2024, vol. 306, no. 7, pp. 7–17, doi: <a href=\"https://doi.org/10.4230/LIPIcs.MFCS.2024.7\">10.4230/LIPIcs.MFCS.2024.7</a>.","apa":"Agarwal, A., Gharibian, S., Koppula, V., &#38; Rudolph, D. (2024). Quantum Polynomial Hierarchies: Karp-Lipton, error reduction, and lower  bounds. <i>Proceedings of 49th International Symposium on Mathematical Foundations of Computer Science (MFCS)</i>, <i>306</i>(7), 7–17. <a href=\"https://doi.org/10.4230/LIPIcs.MFCS.2024.7\">https://doi.org/10.4230/LIPIcs.MFCS.2024.7</a>","chicago":"Agarwal, Avantika, Sevag Gharibian, Venkata Koppula, and Dorian Rudolph. “Quantum Polynomial Hierarchies: Karp-Lipton, Error Reduction, and Lower  Bounds.” In <i>Proceedings of 49th International Symposium on Mathematical Foundations of Computer Science (MFCS)</i>, 306:7–17, 2024. <a href=\"https://doi.org/10.4230/LIPIcs.MFCS.2024.7\">https://doi.org/10.4230/LIPIcs.MFCS.2024.7</a>.","short":"A. Agarwal, S. Gharibian, V. Koppula, D. Rudolph, in: Proceedings of 49th International Symposium on Mathematical Foundations of Computer Science (MFCS), 2024, pp. 7–17."},"external_id":{"arxiv":["2401.01633"]},"status":"public","_id":"50273","page":"7-17","volume":306,"user_id":"71541","issue":"7","publication":"Proceedings of 49th International Symposium on Mathematical Foundations of Computer Science (MFCS)","abstract":[{"lang":"eng","text":"The Polynomial-Time Hierarchy ($\\mathsf{PH}$) is a staple of classical\r\ncomplexity theory, with applications spanning randomized computation to circuit\r\nlower bounds to ''quantum advantage'' analyses for near-term quantum computers.\r\nQuantumly, however, despite the fact that at least \\emph{four} definitions of\r\nquantum $\\mathsf{PH}$ exist, it has been challenging to prove analogues for\r\nthese of even basic facts from $\\mathsf{PH}$. This work studies three\r\nquantum-verifier based generalizations of $\\mathsf{PH}$, two of which are from\r\n[Gharibian, Santha, Sikora, Sundaram, Yirka, 2022] and use classical strings\r\n($\\mathsf{QCPH}$) and quantum mixed states ($\\mathsf{QPH}$) as proofs, and one\r\nof which is new to this work, utilizing quantum pure states\r\n($\\mathsf{pureQPH}$) as proofs. We first resolve several open problems from\r\n[GSSSY22], including a collapse theorem and a Karp-Lipton theorem for\r\n$\\mathsf{QCPH}$. Then, for our new class $\\mathsf{pureQPH}$, we show one-sided\r\nerror reduction for $\\mathsf{pureQPH}$, as well as the first bounds relating\r\nthese quantum variants of $\\mathsf{PH}$, namely $\\mathsf{QCPH}\\subseteq\r\n\\mathsf{pureQPH} \\subseteq \\mathsf{EXP}^{\\mathsf{PP}}$."}],"date_created":"2024-01-07T20:09:32Z","department":[{"_id":"7"},{"_id":"623"}],"type":"conference","author":[{"last_name":"Agarwal","first_name":"Avantika","full_name":"Agarwal, Avantika"},{"id":"71541","first_name":"Sevag","last_name":"Gharibian","orcid":"0000-0002-9992-3379","full_name":"Gharibian, Sevag"},{"first_name":"Venkata","last_name":"Koppula","full_name":"Koppula, Venkata"},{"last_name":"Rudolph","first_name":"Dorian","full_name":"Rudolph, Dorian","id":"57863"}],"title":"Quantum Polynomial Hierarchies: Karp-Lipton, error reduction, and lower  bounds","year":"2024","intvolume":"       306","publication_status":"published","date_updated":"2026-05-15T08:39:23Z","language":[{"iso":"eng"}],"doi":"10.4230/LIPIcs.MFCS.2024.7"},{"abstract":[{"lang":"eng","text":"What is the power of polynomial-time quantum computation with access to an NP\r\noracle? In this work, we focus on two fundamental tasks from the study of\r\nBoolean satisfiability (SAT) problems: search-to-decision reductions, and\r\napproximate counting. We first show that, in strong contrast to the classical\r\nsetting where a poly-time Turing machine requires $\\Theta(n)$ queries to an NP\r\noracle to compute a witness to a given SAT formula, quantumly $\\Theta(\\log n)$\r\nqueries suffice. We then show this is tight in the black-box model - any\r\nquantum algorithm with \"NP-like\" query access to a formula requires\r\n$\\Omega(\\log n)$ queries to extract a solution with constant probability.\r\nMoving to approximate counting of SAT solutions, by exploiting a quantum link\r\nbetween search-to-decision reductions and approximate counting, we show that\r\nexisting classical approximate counting algorithms are likely optimal. First,\r\nwe give a lower bound in the \"NP-like\" black-box query setting: Approximate\r\ncounting requires $\\Omega(\\log n)$ queries, even on a quantum computer. We then\r\ngive a \"white-box\" lower bound (i.e. where the input formula is not hidden in\r\nthe oracle) - if there exists a randomized poly-time classical or quantum\r\nalgorithm for approximate counting making $o(log n)$ NP queries, then\r\n$\\text{BPP}^{\\text{NP}[o(n)]}$ contains a $\\text{P}^{\\text{NP}}$-complete\r\nproblem if the algorithm is classical and $\\text{FBQP}^{\\text{NP}[o(n)]}$\r\ncontains an $\\text{FP}^{\\text{NP}}$-complete problem if the algorithm is\r\nquantum."}],"citation":{"short":"S. Gharibian, J. Kamminga, in: Proceedings of 51st EATCS International Colloquium on Automata, Languages and Programming (ICALP), 2024, pp. 1–19.","chicago":"Gharibian, Sevag, and Jonas Kamminga. “BQP, Meet NP: Search-to-Decision Reductions and Approximate Counting.” In <i>Proceedings of 51st EATCS International Colloquium on Automata, Languages and Programming (ICALP)</i>, 297:1–19, 2024.","apa":"Gharibian, S., &#38; Kamminga, J. (2024). BQP, meet NP: Search-to-decision reductions and approximate counting. <i>Proceedings of 51st EATCS International Colloquium on Automata, Languages and Programming (ICALP)</i>, <i>297</i>(70), 1–19.","ieee":"S. Gharibian and J. Kamminga, “BQP, meet NP: Search-to-decision reductions and approximate counting,” in <i>Proceedings of 51st EATCS International Colloquium on Automata, Languages and Programming (ICALP)</i>, 2024, vol. 297, no. 70, pp. 1–19.","ama":"Gharibian S, Kamminga J. BQP, meet NP: Search-to-decision reductions and approximate counting. In: <i>Proceedings of 51st EATCS International Colloquium on Automata, Languages and Programming (ICALP)</i>. Vol 297. ; 2024:1-19.","bibtex":"@inproceedings{Gharibian_Kamminga_2024, title={BQP, meet NP: Search-to-decision reductions and approximate counting}, volume={297}, number={70}, booktitle={Proceedings of 51st EATCS International Colloquium on Automata, Languages and Programming (ICALP)}, author={Gharibian, Sevag and Kamminga, Jonas}, year={2024}, pages={1–19} }","mla":"Gharibian, Sevag, and Jonas Kamminga. “BQP, Meet NP: Search-to-Decision Reductions and Approximate Counting.” <i>Proceedings of 51st EATCS International Colloquium on Automata, Languages and Programming (ICALP)</i>, vol. 297, no. 70, 2024, pp. 1–19."},"issue":"70","publication":"Proceedings of 51st EATCS International Colloquium on Automata, Languages and Programming (ICALP)","department":[{"_id":"7"},{"_id":"623"}],"type":"conference","date_created":"2024-01-09T13:59:44Z","external_id":{"arxiv":["2401.03943"]},"intvolume":"       297","date_updated":"2026-05-15T08:41:59Z","publication_status":"published","author":[{"full_name":"Gharibian, Sevag","last_name":"Gharibian","first_name":"Sevag","orcid":"0000-0002-9992-3379","id":"71541"},{"full_name":"Kamminga, Jonas","last_name":"Kamminga","first_name":"Jonas"}],"year":"2024","title":"BQP, meet NP: Search-to-decision reductions and approximate counting","status":"public","volume":297,"user_id":"71541","language":[{"iso":"eng"}],"_id":"50406","page":"1-19"},{"date_updated":"2026-05-15T08:41:38Z","title":"Second order cone relaxations for quantum Max Cut","status":"public","year":"2024","author":[{"first_name":"Felix","last_name":"Huber","full_name":"Huber, Felix"},{"last_name":"Thompson","first_name":"Kevin","full_name":"Thompson, Kevin"},{"full_name":"Parekh, Ojas","first_name":"Ojas","last_name":"Parekh"},{"orcid":"0000-0002-9992-3379","last_name":"Gharibian","first_name":"Sevag","full_name":"Gharibian, Sevag","id":"71541"}],"user_id":"71541","_id":"56944","language":[{"iso":"eng"}],"abstract":[{"text":"Quantum Max Cut (QMC), also known as the quantum anti-ferromagnetic\r\nHeisenberg model, is a QMA-complete problem relevant to quantum many-body\r\nphysics and computer science. Semidefinite programming relaxations have been\r\nfruitful in designing theoretical approximation algorithms for QMC, but are\r\ncomputationally expensive for systems beyond tens of qubits. We give a second\r\norder cone relaxation for QMC, which optimizes over the set of mutually\r\nconsistent three-qubit reduced density matrices. In combination with Pauli\r\nlevel-$1$ of the quantum Lasserre hierarchy, the relaxation achieves an\r\napproximation ratio of $0.526$ to the ground state energy. Our relaxation is\r\nsolvable on systems with hundreds of qubits and paves the way to\r\ncomputationally efficient lower and upper bounds on the ground state energy of\r\nlarge-scale quantum spin systems.","lang":"eng"}],"publication":"arXiv:2411.04120","citation":{"bibtex":"@article{Huber_Thompson_Parekh_Gharibian_2024, title={Second order cone relaxations for quantum Max Cut}, journal={arXiv:2411.04120}, author={Huber, Felix and Thompson, Kevin and Parekh, Ojas and Gharibian, Sevag}, year={2024} }","ama":"Huber F, Thompson K, Parekh O, Gharibian S. Second order cone relaxations for quantum Max Cut. <i>arXiv:241104120</i>. Published online 2024.","mla":"Huber, Felix, et al. “Second Order Cone Relaxations for Quantum Max Cut.” <i>ArXiv:2411.04120</i>, 2024.","short":"F. Huber, K. Thompson, O. Parekh, S. Gharibian, ArXiv:2411.04120 (2024).","chicago":"Huber, Felix, Kevin Thompson, Ojas Parekh, and Sevag Gharibian. “Second Order Cone Relaxations for Quantum Max Cut.” <i>ArXiv:2411.04120</i>, 2024.","ieee":"F. Huber, K. Thompson, O. Parekh, and S. Gharibian, “Second order cone relaxations for quantum Max Cut,” <i>arXiv:2411.04120</i>. 2024.","apa":"Huber, F., Thompson, K., Parekh, O., &#38; Gharibian, S. (2024). Second order cone relaxations for quantum Max Cut. In <i>arXiv:2411.04120</i>."},"type":"preprint","department":[{"_id":"7"},{"_id":"623"}],"external_id":{"arxiv":["2411.04120"]},"date_created":"2024-11-07T12:09:37Z"},{"related_material":{"link":[{"url":"https://dl.acm.org/doi/abs/10.1145/3639528.3639535","relation":"confirmation"}]},"abstract":[{"text":"When it comes to NP, its natural definition, its wide applicability across scientific disciplines, and its timeless relevance, the writing is on the wall: There can be only one. Quantum NP, on the other hand, is clearly the apple that fell far from the tree of NP. Two decades since the first definitions of quantum NP started rolling in, quantum complexity theorists face a stark reality: There's QMA, QCMA, QMA1, QMA(2), StoqMA, and NQP. In this article aimed at a general theoretical computer science audience, I survey these various definitions of quantum NP, their strengths and weaknesses, and why most of them, for better or worse, actually appear to fit naturally into the complexity zoo.","lang":"eng"}],"publication":"ACM SIGACT News","issue":"4","department":[{"_id":"7"},{"_id":"623"}],"type":"journal_article","date_created":"2023-10-30T12:19:11Z","article_type":"review","intvolume":"        54","publication_status":"published","date_updated":"2026-05-15T08:42:54Z","author":[{"full_name":"Gharibian, Sevag","orcid":"0000-0002-9992-3379","last_name":"Gharibian","first_name":"Sevag","id":"71541"}],"year":"2024","title":"Guest Column: The 7 faces of quantum NP","language":[{"iso":"eng"}],"main_file_link":[{"url":"https://arxiv.org/abs/2310.18010","open_access":"1"}],"citation":{"chicago":"Gharibian, Sevag. “Guest Column: The 7 Faces of Quantum NP.” <i>ACM SIGACT News</i> 54, no. 4 (2024): 54–91.","short":"S. Gharibian, ACM SIGACT News 54 (2024) 54–91.","ieee":"S. Gharibian, “Guest Column: The 7 faces of quantum NP,” <i>ACM SIGACT News</i>, vol. 54, no. 4, pp. 54–91, 2024.","apa":"Gharibian, S. (2024). Guest Column: The 7 faces of quantum NP. <i>ACM SIGACT News</i>, <i>54</i>(4), 54–91.","bibtex":"@article{Gharibian_2024, title={Guest Column: The 7 faces of quantum NP}, volume={54}, number={4}, journal={ACM SIGACT News}, author={Gharibian, Sevag}, year={2024}, pages={54–91} }","ama":"Gharibian S. Guest Column: The 7 faces of quantum NP. <i>ACM SIGACT News</i>. 2024;54(4):54-91.","mla":"Gharibian, Sevag. “Guest Column: The 7 Faces of Quantum NP.” <i>ACM SIGACT News</i>, vol. 54, no. 4, 2024, pp. 54–91."},"oa":"1","status":"public","volume":54,"user_id":"71541","_id":"48544","page":"54-91"},{"publication":"Mehrsprachigkeit in der Schule: Sprachbildung im und durch Sachunterricht","citation":{"ieee":"A. Gövert, C. Niederhaus, and E. Blumberg, “Professionalisierung für Sprachbildung aus Sicht von Sachunterrichtsstudierenden – Langzeitwirkungen eines Vertiefungsseminars in der ersten Phase der sachunterrichtsdidaktischen Lehrer*innenbildung. ,” in <i>Mehrsprachigkeit in der Schule: Sprachbildung im und durch Sachunterricht</i>, E. Blumberg, N. Constanze, and M. Anne, Eds. Stuttgart: Kohlhammer, 2024, pp. 295--309.","apa":"Gövert, A., Niederhaus, C., &#38; Blumberg, E. (2024). Professionalisierung für Sprachbildung aus Sicht von Sachunterrichtsstudierenden – Langzeitwirkungen eines Vertiefungsseminars in der ersten Phase der sachunterrichtsdidaktischen Lehrer*innenbildung. . In E. Blumberg, N. Constanze, &#38; M. Anne (Eds.), <i>Mehrsprachigkeit in der Schule: Sprachbildung im und durch Sachunterricht</i> (pp. 295--309). Kohlhammer.","chicago":"Gövert, Andre, Constanze Niederhaus, and Eva Blumberg. “Professionalisierung Für Sprachbildung Aus Sicht von Sachunterrichtsstudierenden – Langzeitwirkungen Eines Vertiefungsseminars in Der Ersten Phase Der Sachunterrichtsdidaktischen Lehrer*innenbildung. .” In <i>Mehrsprachigkeit in Der Schule: Sprachbildung Im Und Durch Sachunterricht</i>, edited by Eva Blumberg, Niederhaus Constanze, and Mischendahl Anne, 295--309. Stuttgart: Kohlhammer, 2024.","short":"A. Gövert, C. Niederhaus, E. Blumberg, in: E. Blumberg, N. Constanze, M. Anne (Eds.), Mehrsprachigkeit in Der Schule: Sprachbildung Im Und Durch Sachunterricht, Kohlhammer, Stuttgart, 2024, pp. 295--309.","mla":"Gövert, Andre, et al. “Professionalisierung Für Sprachbildung Aus Sicht von Sachunterrichtsstudierenden – Langzeitwirkungen Eines Vertiefungsseminars in Der Ersten Phase Der Sachunterrichtsdidaktischen Lehrer*innenbildung. .” <i>Mehrsprachigkeit in Der Schule: Sprachbildung Im Und Durch Sachunterricht</i>, edited by Eva Blumberg et al., Kohlhammer, 2024, pp. 295--309.","bibtex":"@inbook{Gövert_Niederhaus_Blumberg_2024, place={Stuttgart}, title={Professionalisierung für Sprachbildung aus Sicht von Sachunterrichtsstudierenden – Langzeitwirkungen eines Vertiefungsseminars in der ersten Phase der sachunterrichtsdidaktischen Lehrer*innenbildung. }, booktitle={Mehrsprachigkeit in der Schule: Sprachbildung im und durch Sachunterricht}, publisher={Kohlhammer}, author={Gövert, Andre and Niederhaus, Constanze and Blumberg, Eva}, editor={Blumberg, Eva and Constanze, Niederhaus and Anne, Mischendahl}, year={2024}, pages={295--309} }","ama":"Gövert A, Niederhaus C, Blumberg E. Professionalisierung für Sprachbildung aus Sicht von Sachunterrichtsstudierenden – Langzeitwirkungen eines Vertiefungsseminars in der ersten Phase der sachunterrichtsdidaktischen Lehrer*innenbildung. . In: Blumberg E, Constanze N, Anne M, eds. <i>Mehrsprachigkeit in Der Schule: Sprachbildung Im Und Durch Sachunterricht</i>. Kohlhammer; 2024:295--309."},"type":"book_chapter","place":"Stuttgart","date_created":"2026-05-19T11:46:42Z","date_updated":"2026-05-19T11:46:49Z","title":"Professionalisierung für Sprachbildung aus Sicht von Sachunterrichtsstudierenden – Langzeitwirkungen eines Vertiefungsseminars in der ersten Phase der sachunterrichtsdidaktischen Lehrer*innenbildung. ","year":"2024","status":"public","author":[{"full_name":"Gövert, Andre","last_name":"Gövert","first_name":"Andre"},{"last_name":"Niederhaus","first_name":"Constanze","full_name":"Niederhaus, Constanze"},{"full_name":"Blumberg, Eva","first_name":"Eva","last_name":"Blumberg"}],"user_id":"54999","editor":[{"full_name":"Blumberg, Eva","last_name":"Blumberg","first_name":"Eva"},{"last_name":"Constanze","first_name":"Niederhaus","full_name":"Constanze, Niederhaus"},{"first_name":"Mischendahl","last_name":"Anne","full_name":"Anne, Mischendahl"}],"page":"295--309","_id":"65638","language":[{"iso":"eng"}],"publisher":"Kohlhammer"},{"intvolume":"        29","date_updated":"2026-05-19T15:36:17Z","status":"public","year":"2024","title":"(Mehr-)Sprachen-Bildung in beruflichen Kontexten","editor":[{"first_name":"Sandra","last_name":"Drumm","full_name":"Drumm, Sandra"},{"id":"54999","full_name":"Niederhaus, Constanze","first_name":"Constanze","last_name":"Niederhaus"}],"volume":29,"user_id":"54999","_id":"65649","language":[{"iso":"eng"}],"citation":{"ieee":"S. Drumm and C. Niederhaus, Eds., <i>(Mehr-)Sprachen-Bildung in beruflichen Kontexten</i>, vol. 29. 2024.","apa":"(Mehr-)Sprachen-Bildung in beruflichen Kontexten. (2024). In S. Drumm &#38; C. Niederhaus (Eds.), <i> Zeitschrift für Interkulturellen Fremdsprachenunterricht (ZIF) </i> (Vol. 29).","short":"S. Drumm, C. Niederhaus, eds., (Mehr-)Sprachen-Bildung in Beruflichen Kontexten, 2024.","chicago":"Drumm, Sandra, and Constanze Niederhaus, eds. <i>(Mehr-)Sprachen-Bildung in Beruflichen Kontexten</i>. <i> Zeitschrift Für Interkulturellen Fremdsprachenunterricht (ZIF) </i>. Vol. 29, 2024.","mla":"Drumm, Sandra, and Constanze Niederhaus, editors. “(Mehr-)Sprachen-Bildung in Beruflichen Kontexten.” <i> Zeitschrift Für Interkulturellen Fremdsprachenunterricht (ZIF) </i>, vol. 29, 2024.","bibtex":"@book{Drumm_Niederhaus_2024, title={(Mehr-)Sprachen-Bildung in beruflichen Kontexten}, volume={29}, journal={ Zeitschrift für Interkulturellen Fremdsprachenunterricht (ZIF) }, year={2024} }","ama":"Drumm S, Niederhaus C, eds. <i>(Mehr-)Sprachen-Bildung in Beruflichen Kontexten</i>. Vol 29.; 2024."},"publication":" Zeitschrift für Interkulturellen Fremdsprachenunterricht (ZIF) ","type":"journal_editor","date_created":"2026-05-19T15:35:48Z"},{"type":"research_data","date_created":"2026-05-19T15:29:38Z","citation":{"chicago":"Drumm, Sandra, and Constanze Niederhaus. <i>Mehrsprachigkeit in Der Beruflichen Bildung: Einleitung in Das Themenheft</i>. LibreCat University, 2024. <a href=\"https://doi.org/10.48694/ZIF.3900\">https://doi.org/10.48694/ZIF.3900</a>.","short":"S. Drumm, C. Niederhaus, Mehrsprachigkeit in Der Beruflichen Bildung: Einleitung in Das Themenheft, LibreCat University, 2024.","ieee":"S. Drumm and C. Niederhaus, <i>Mehrsprachigkeit in der beruflichen Bildung: Einleitung in das Themenheft</i>. LibreCat University, 2024.","apa":"Drumm, S., &#38; Niederhaus, C. (2024). <i>Mehrsprachigkeit in der beruflichen Bildung: Einleitung in das Themenheft</i>. 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LibreCat University, 2024, doi:<a href=\"https://doi.org/10.48694/ZIF.3900\">10.48694/ZIF.3900</a>."},"user_id":"54999","doi":"10.48694/ZIF.3900","publisher":"LibreCat University","_id":"65648","date_updated":"2026-05-19T15:37:33Z","title":"Mehrsprachigkeit in der beruflichen Bildung: Einleitung in das Themenheft","year":"2024","status":"public","author":[{"first_name":"Sandra","last_name":"Drumm","full_name":"Drumm, Sandra"},{"last_name":"Niederhaus","first_name":"Constanze","full_name":"Niederhaus, Constanze","id":"54999"}]}]