--- _id: '63192' abstract: - lang: eng text: Lithium niobate (LiNbO3) is a widely used material with several desirable physical properties, such as high second-order nonlinear optical and strong electro-optical effects. Thus LiNbO3 is used for various applications such as electro-optic modulation or nonlinear frequency conversion and mixing. But LiNbO3 also exhibits a strong photorefractive effect, which limits the intensity of the optical fields involved. Various approaches to reduce the photorefractive effect have been investigated, such as increasing the temperature, doping the crystal or using different waveguide designs in LiNbO3. Here, we present an analysis of the approach to increase the photorefractive damage threshold by using different waveguide designs. Contrary to previous claims and investigations, our SHG measurements revealed no significant difference in resistance to photorefractive damage when comparing conventional Ti-doped channel waveguides and Ti-doped diced ridge waveguides in LiNbO3. Furthermore, we have investigated the effect of photorefractive cleaning and curing using a light field at 532 nm. Here, we observe a reduction in the photorefractive effect at room temperature during and after SHG measurements, which is an easy alternative to conventional approaches. article_number: '114260' article_type: original author: - first_name: Michelle full_name: Kirsch, Michelle id: '69553' last_name: Kirsch - first_name: Christian full_name: Kießler, Christian id: '44252' last_name: Kießler - first_name: Sebastian full_name: Lengeling, Sebastian id: '44373' last_name: Lengeling - first_name: Michael full_name: Stefszky, Michael id: '42777' last_name: Stefszky - first_name: Christof full_name: Eigner, Christof id: '13244' last_name: Eigner orcid: https://orcid.org/0000-0002-5693-3083 - first_name: Harald full_name: Herrmann, Harald id: '216' last_name: Herrmann - first_name: Christine full_name: Silberhorn, Christine id: '26263' last_name: Silberhorn citation: ama: Kirsch M, Kießler C, Lengeling S, et al. Photorefraction and in-situ optical cleaning in various types of LiNbO3 waveguides. Optics & Laser Technology. 2025;193. doi:10.1016/j.optlastec.2025.114260 apa: Kirsch, M., Kießler, C., Lengeling, S., Stefszky, M., Eigner, C., Herrmann, H., & Silberhorn, C. (2025). Photorefraction and in-situ optical cleaning in various types of LiNbO3 waveguides. Optics & Laser Technology, 193, Article 114260. https://doi.org/10.1016/j.optlastec.2025.114260 bibtex: '@article{Kirsch_Kießler_Lengeling_Stefszky_Eigner_Herrmann_Silberhorn_2025, title={Photorefraction and in-situ optical cleaning in various types of LiNbO3 waveguides}, volume={193}, DOI={10.1016/j.optlastec.2025.114260}, number={114260}, journal={Optics & Laser Technology}, publisher={Elsevier BV}, author={Kirsch, Michelle and Kießler, Christian and Lengeling, Sebastian and Stefszky, Michael and Eigner, Christof and Herrmann, Harald and Silberhorn, Christine}, year={2025} }' chicago: Kirsch, Michelle, Christian Kießler, Sebastian Lengeling, Michael Stefszky, Christof Eigner, Harald Herrmann, and Christine Silberhorn. “Photorefraction and In-Situ Optical Cleaning in Various Types of LiNbO3 Waveguides.” Optics & Laser Technology 193 (2025). https://doi.org/10.1016/j.optlastec.2025.114260. ieee: 'M. Kirsch et al., “Photorefraction and in-situ optical cleaning in various types of LiNbO3 waveguides,” Optics & Laser Technology, vol. 193, Art. no. 114260, 2025, doi: 10.1016/j.optlastec.2025.114260.' mla: Kirsch, Michelle, et al. “Photorefraction and In-Situ Optical Cleaning in Various Types of LiNbO3 Waveguides.” Optics & Laser Technology, vol. 193, 114260, Elsevier BV, 2025, doi:10.1016/j.optlastec.2025.114260. short: M. Kirsch, C. Kießler, S. Lengeling, M. Stefszky, C. Eigner, H. Herrmann, C. Silberhorn, Optics & Laser Technology 193 (2025). date_created: 2025-12-18T08:17:57Z date_updated: 2025-12-18T08:27:13Z department: - _id: '288' - _id: '623' - _id: '15' doi: 10.1016/j.optlastec.2025.114260 intvolume: ' 193' language: - iso: eng main_file_link: - open_access: '1' url: https://www.sciencedirect.com/science/article/pii/S0030399225018511?via%3Dihub oa: '1' publication: Optics & Laser Technology publication_identifier: issn: - 0030-3992 publication_status: published publisher: Elsevier BV quality_controlled: '1' status: public title: Photorefraction and in-situ optical cleaning in various types of LiNbO3 waveguides type: journal_article user_id: '69553' volume: 193 year: '2025' ... --- _id: '62766' abstract: - lang: eng text: raditional assessment formats in university-based EFL teacher education programs usually focus on cognitive dispositions rather than on the actual performance of pre-service EFL teachers in everyday teaching situations. This assessment gap is addressed in this thesis by developing and validating a role-play-based simulation (RobS) designed for the summative assessment of pre-service EFL teachers' feedback competence on writing. Drawing on theories from multiple disciplines, such as higher education, medical education, teacher education, educational psychology, and EFL-specific didactics, the RobS is developed as a performance-oriented assessment format. In the RobS, pre-service EFL teachers engage in a feedback conversation with trained actors who portray a standardized learner. Following an argument-based approach to validation, the extent to which the RobS can be considered valid is investigated. Data from multiple studies, focusing on aspects such as authenticity, fairness, reliability, and external validity, are presented. The discussion in the validity argument indicates that the RobS can elicit and assess the performative facet of feedback competence on writing with sufficient confidence. This work contributes a novel, empirically supported assessment framework to teacher education research. Moreover, it presents an approach to address the assessment gap, enabling pre-service EFL teachers to show how they provide feedback, rather than just tell their lecturers about it. author: - first_name: Thomas full_name: Janzen, Thomas id: '89329' last_name: Janzen orcid: 0009-0003-1941-166X citation: ama: Janzen T. Show, Don’t Tell - Developing and Validating a Role-Play-Based Simulation (RobS) for the Assessment of Pre-Service EFL Teachers’ Feedback Competence on Writing. Logos Verlag; 2025. doi:https://doi.org/10.30819/5994 apa: Janzen, T. (2025). Show, don’t tell - Developing and Validating a Role-Play-Based Simulation (RobS) for the Assessment of Pre-Service EFL Teachers’ Feedback Competence on Writing. Logos Verlag. https://doi.org/10.30819/5994 bibtex: '@book{Janzen_2025, place={Berlin}, title={Show, don’t tell - Developing and Validating a Role-Play-Based Simulation (RobS) for the Assessment of Pre-Service EFL Teachers’ Feedback Competence on Writing}, DOI={https://doi.org/10.30819/5994}, publisher={Logos Verlag}, author={Janzen, Thomas}, year={2025} }' chicago: 'Janzen, Thomas. Show, Don’t Tell - Developing and Validating a Role-Play-Based Simulation (RobS) for the Assessment of Pre-Service EFL Teachers’ Feedback Competence on Writing. Berlin: Logos Verlag, 2025. https://doi.org/10.30819/5994.' ieee: 'T. Janzen, Show, don’t tell - Developing and Validating a Role-Play-Based Simulation (RobS) for the Assessment of Pre-Service EFL Teachers’ Feedback Competence on Writing. Berlin: Logos Verlag, 2025.' mla: Janzen, Thomas. Show, Don’t Tell - Developing and Validating a Role-Play-Based Simulation (RobS) for the Assessment of Pre-Service EFL Teachers’ Feedback Competence on Writing. Logos Verlag, 2025, doi:https://doi.org/10.30819/5994. short: T. Janzen, Show, Don’t Tell - Developing and Validating a Role-Play-Based Simulation (RobS) for the Assessment of Pre-Service EFL Teachers’ Feedback Competence on Writing, Logos Verlag, Berlin, 2025. date_created: 2025-12-03T11:11:44Z date_updated: 2025-12-23T07:33:22Z ddc: - '370' doi: https://doi.org/10.30819/5994 extern: '1' file: - access_level: open_access content_type: application/pdf creator: janzent date_created: 2025-12-23T07:31:25Z date_updated: 2025-12-23T07:31:25Z file_id: '63404' file_name: Janzen, T. (2025).pdf file_size: 9551046 relation: main_file file_date_updated: 2025-12-23T07:31:25Z has_accepted_license: '1' language: - iso: eng main_file_link: - open_access: '1' url: https://doi.org/10.30819/5994 oa: '1' place: Berlin publication_identifier: unknown: - ' 978-3-8325-5994-6' publication_status: published publisher: Logos Verlag status: public supervisor: - first_name: Christoph full_name: Vogelsang, Christoph id: '4245' last_name: Vogelsang orcid: 0000-0002-5804-1855 title: Show, don’t tell - Developing and Validating a Role-Play-Based Simulation (RobS) for the Assessment of Pre-Service EFL Teachers’ Feedback Competence on Writing type: dissertation user_id: '89329' year: '2025' ... --- _id: '63397' abstract: - lang: eng text: Decarbonizing industrial process heat is a crucial step in mitigating climate change. While Process Mining (PM) has gained traction in sustainability research—such as optimizing production scheduling to reduce energy use or accounting for carbon footprints—it has largely overlooked the challenges and opportunities related to thermal energy, accounting for 66% of total energy demand in industrial processes. At the same time, Heat Integration (HI) is an established engineering discipline focused on maximizing the efficiency of thermal energy systems. However, HI traditionally relies on static or incomplete data about energy demands, limiting its effectiveness and accuracy. In this paper, we propose a novel framework that combines PM and HI to enable data-driven, process- and product-centric modeling of industrial energy demands. By integrating event logs and thermal energy data, our approach allows for a fine-grained analysis of heat demand patterns corresponding to specific process activities and product variants. We demonstrate the applicability and advantages of the framework by simulating a pharmaceutical manufacturing process and evaluating energy demands and heat recovery potentials. Our findings show that our PM-enabled HI framework provides more accurate and actionable insights into the temporal and product-specific variation of thermal energy demands. By capturing the causal relationships between process activities, product characteristics, and energy consumption, our approach enables improved analysis, planning, and optimization for heat recovery and process decarbonization. This integration of PM and HI expands the analytical tools for both disciplines and contributes to advancing the sustainable transformation of industrial processes. author: - first_name: David Ricardo full_name: Zapata Gonzalez, David Ricardo id: '105506' last_name: Zapata Gonzalez - first_name: Katharina full_name: Brennig, Katharina id: '51905' last_name: Brennig - first_name: Kay full_name: Benkert, Kay last_name: Benkert - first_name: Florian full_name: Schlosser, Florian id: '88614' last_name: Schlosser - first_name: Oliver full_name: Müller, Oliver id: '72849' last_name: Müller citation: ama: 'Zapata Gonzalez DR, Brennig K, Benkert K, Schlosser F, Müller O. Process Mining for Robust Heat Integration through Process- and Product-Centric Energy Demand Modeling. In: ACM SIGEnergy Energy Informatics Review. Vol 5. Association for Computing Machinery (ACM); 2025:19-31. doi:10.1145/3777518.3777520' apa: Zapata Gonzalez, D. R., Brennig, K., Benkert, K., Schlosser, F., & Müller, O. (2025). Process Mining for Robust Heat Integration through Process- and Product-Centric Energy Demand Modeling. ACM SIGEnergy Energy Informatics Review, 5(3), 19–31. https://doi.org/10.1145/3777518.3777520 bibtex: '@inproceedings{Zapata Gonzalez_Brennig_Benkert_Schlosser_Müller_2025, title={Process Mining for Robust Heat Integration through Process- and Product-Centric Energy Demand Modeling}, volume={5}, DOI={10.1145/3777518.3777520}, number={3}, booktitle={ACM SIGEnergy Energy Informatics Review}, publisher={Association for Computing Machinery (ACM)}, author={Zapata Gonzalez, David Ricardo and Brennig, Katharina and Benkert, Kay and Schlosser, Florian and Müller, Oliver}, year={2025}, pages={19–31} }' chicago: Zapata Gonzalez, David Ricardo, Katharina Brennig, Kay Benkert, Florian Schlosser, and Oliver Müller. “Process Mining for Robust Heat Integration through Process- and Product-Centric Energy Demand Modeling.” In ACM SIGEnergy Energy Informatics Review, 5:19–31. Association for Computing Machinery (ACM), 2025. https://doi.org/10.1145/3777518.3777520. ieee: 'D. R. Zapata Gonzalez, K. Brennig, K. Benkert, F. Schlosser, and O. Müller, “Process Mining for Robust Heat Integration through Process- and Product-Centric Energy Demand Modeling,” in ACM SIGEnergy Energy Informatics Review, 2025, vol. 5, no. 3, pp. 19–31, doi: 10.1145/3777518.3777520.' mla: Zapata Gonzalez, David Ricardo, et al. “Process Mining for Robust Heat Integration through Process- and Product-Centric Energy Demand Modeling.” ACM SIGEnergy Energy Informatics Review, vol. 5, no. 3, Association for Computing Machinery (ACM), 2025, pp. 19–31, doi:10.1145/3777518.3777520. short: 'D.R. Zapata Gonzalez, K. Brennig, K. Benkert, F. Schlosser, O. Müller, in: ACM SIGEnergy Energy Informatics Review, Association for Computing Machinery (ACM), 2025, pp. 19–31.' date_created: 2025-12-22T13:13:37Z date_updated: 2025-12-22T13:15:08Z doi: 10.1145/3777518.3777520 intvolume: ' 5' issue: '3' language: - iso: eng main_file_link: - open_access: '1' url: https://dl.acm.org/doi/abs/10.1145/3777518.3777520 oa: '1' page: 19-31 publication: ACM SIGEnergy Energy Informatics Review publication_identifier: issn: - 2770-5331 - 2770-5331 publication_status: published publisher: Association for Computing Machinery (ACM) status: public title: Process Mining for Robust Heat Integration through Process- and Product-Centric Energy Demand Modeling type: conference user_id: '105506' volume: 5 year: '2025' ... --- _id: '63400' abstract: - lang: eng text: Data centers (DCs) form the backbone of our growing digital economy, but their rising energy demands pose challenges to our environment. At the same time, reusing waste heat from DCs also represents an opportunity, for example, for more sustainable heating of residential buildings. Modeling and optimizing these coupled and dynamic systems of heat generation and reuse is complex. On the one hand, physical simulations can be used to model these systems, but they are time-consuming to develop and run. Machine learning (ML), on the other hand, allows efficient data-driven modeling, but conventional correlation-based approaches struggle with the prediction of interventions and out-of-distribution generalization. Recent advances in causal ML, which combine principles from causal inference with flexible ML methods, are a promising approach for more robust predictions. Due to their focus on modeling interventions and cause-and-effect relationships, it is difficult to evaluate causal ML approaches rigorously. To address this challenge, we built a testbed of a miniature DC with an integrated waste heat network, equipped with sensors and actuators. This testbed allows conducting controlled experiments and automatic collection of realistic data, which can then be used to benchmark conventional and causal ML methods. Our experimental results highlight the strengths and weaknesses of each modeling approach, providing valuable insights on how to appropriately apply different types of machine learning to optimize data center operations and enhance their sustainability. author: - first_name: David Ricardo full_name: Zapata Gonzalez, David Ricardo id: '105506' last_name: Zapata Gonzalez - first_name: Marcel full_name: Meyer, Marcel id: '105120' last_name: Meyer - first_name: Oliver full_name: Müller, Oliver id: '72849' last_name: Müller citation: ama: 'Zapata Gonzalez DR, Meyer M, Müller O. Causal Machine Learning Approaches for Modelling Data Center Heat Recovery: A Physical Testbed Study. In: ACM SIGEnergy Energy Informatics Review. Vol 5. Association for Computing Machinery (ACM); 2025:4-10. doi:10.1145/3757892.3757893' apa: 'Zapata Gonzalez, D. R., Meyer, M., & Müller, O. (2025). Causal Machine Learning Approaches for Modelling Data Center Heat Recovery: A Physical Testbed Study. ACM SIGEnergy Energy Informatics Review, 5(2), 4–10. https://doi.org/10.1145/3757892.3757893' bibtex: '@inproceedings{Zapata Gonzalez_Meyer_Müller_2025, title={Causal Machine Learning Approaches for Modelling Data Center Heat Recovery: A Physical Testbed Study}, volume={5}, DOI={10.1145/3757892.3757893}, number={2}, booktitle={ACM SIGEnergy Energy Informatics Review}, publisher={Association for Computing Machinery (ACM)}, author={Zapata Gonzalez, David Ricardo and Meyer, Marcel and Müller, Oliver}, year={2025}, pages={4–10} }' chicago: 'Zapata Gonzalez, David Ricardo, Marcel Meyer, and Oliver Müller. “Causal Machine Learning Approaches for Modelling Data Center Heat Recovery: A Physical Testbed Study.” In ACM SIGEnergy Energy Informatics Review, 5:4–10. Association for Computing Machinery (ACM), 2025. https://doi.org/10.1145/3757892.3757893.' ieee: 'D. R. Zapata Gonzalez, M. Meyer, and O. Müller, “Causal Machine Learning Approaches for Modelling Data Center Heat Recovery: A Physical Testbed Study,” in ACM SIGEnergy Energy Informatics Review, 2025, vol. 5, no. 2, pp. 4–10, doi: 10.1145/3757892.3757893.' mla: 'Zapata Gonzalez, David Ricardo, et al. “Causal Machine Learning Approaches for Modelling Data Center Heat Recovery: A Physical Testbed Study.” ACM SIGEnergy Energy Informatics Review, vol. 5, no. 2, Association for Computing Machinery (ACM), 2025, pp. 4–10, doi:10.1145/3757892.3757893.' short: 'D.R. Zapata Gonzalez, M. Meyer, O. Müller, in: ACM SIGEnergy Energy Informatics Review, Association for Computing Machinery (ACM), 2025, pp. 4–10.' date_created: 2025-12-22T13:19:06Z date_updated: 2025-12-22T13:20:02Z doi: 10.1145/3757892.3757893 intvolume: ' 5' issue: '2' language: - iso: eng main_file_link: - open_access: '1' url: https://dl.acm.org/doi/abs/10.1145/3757892.3757893 oa: '1' page: 4-10 publication: ACM SIGEnergy Energy Informatics Review publication_identifier: issn: - 2770-5331 - 2770-5331 publication_status: published publisher: Association for Computing Machinery (ACM) status: public title: 'Causal Machine Learning Approaches for Modelling Data Center Heat Recovery: A Physical Testbed Study' type: conference user_id: '105506' volume: 5 year: '2025' ... --- _id: '63399' abstract: - lang: eng text: Data centers (DCs) form the backbone of our growing digital economy, but their rising energy demands pose challenges to our environment. At the same time, reusing waste heat from DCs also represents an opportunity, for example, for more sustainable heating of residential buildings. Modeling and optimizing these coupled and dynamic systems of heat generation and reuse is complex. On the one hand, physical simulations can be used to model these systems, but they are time-consuming to develop and run. Machine learning (ML), on the other hand, allows efficient data-driven modeling, but conventional correlation-based approaches struggle with the prediction of interventions and out-of-distribution generalization. Recent advances in causal ML, which combine principles from causal inference with flexible ML methods, are a promising approach for more robust predictions. Due to their focus on modeling interventions and cause-and-effect relationships, it is difficult to evaluate causal ML approaches rigorously. To address this challenge, we built a testbed of a miniature DC with an integrated waste heat network, equipped with sensors and actuators. This testbed allows conducting controlled experiments and automatic collection of realistic data, which can then be used to benchmark conventional and causal ML methods. Our experimental results highlight the strengths and weaknesses of each modeling approach, providing valuable insights on how to appropriately apply different types of machine learning to optimize data center operations and enhance their sustainability. author: - first_name: David Zapata full_name: Gonzalez, David Zapata last_name: Gonzalez - first_name: Marcel full_name: Meyer, Marcel last_name: Meyer - first_name: Oliver full_name: Müller, Oliver last_name: Müller citation: ama: 'Gonzalez DZ, Meyer M, Müller O. Causal Machine Learning Approaches for Modelling Data Center Heat Recovery: A Physical Testbed Study. In: ACM SIGEnergy Energy Informatics Review. Vol 5. Association for Computing Machinery (ACM); 2025:4-10. doi:10.1145/3757892.3757893' apa: 'Gonzalez, D. Z., Meyer, M., & Müller, O. (2025). Causal Machine Learning Approaches for Modelling Data Center Heat Recovery: A Physical Testbed Study. ACM SIGEnergy Energy Informatics Review, 5(2), 4–10. https://doi.org/10.1145/3757892.3757893' bibtex: '@inproceedings{Gonzalez_Meyer_Müller_2025, title={Causal Machine Learning Approaches for Modelling Data Center Heat Recovery: A Physical Testbed Study}, volume={5}, DOI={10.1145/3757892.3757893}, number={2}, booktitle={ACM SIGEnergy Energy Informatics Review}, publisher={Association for Computing Machinery (ACM)}, author={Gonzalez, David Zapata and Meyer, Marcel and Müller, Oliver}, year={2025}, pages={4–10} }' chicago: 'Gonzalez, David Zapata, Marcel Meyer, and Oliver Müller. “Causal Machine Learning Approaches for Modelling Data Center Heat Recovery: A Physical Testbed Study.” In ACM SIGEnergy Energy Informatics Review, 5:4–10. Association for Computing Machinery (ACM), 2025. https://doi.org/10.1145/3757892.3757893.' ieee: 'D. Z. Gonzalez, M. Meyer, and O. Müller, “Causal Machine Learning Approaches for Modelling Data Center Heat Recovery: A Physical Testbed Study,” in ACM SIGEnergy Energy Informatics Review, 2025, vol. 5, no. 2, pp. 4–10, doi: 10.1145/3757892.3757893.' mla: 'Gonzalez, David Zapata, et al. “Causal Machine Learning Approaches for Modelling Data Center Heat Recovery: A Physical Testbed Study.” ACM SIGEnergy Energy Informatics Review, vol. 5, no. 2, Association for Computing Machinery (ACM), 2025, pp. 4–10, doi:10.1145/3757892.3757893.' short: 'D.Z. Gonzalez, M. Meyer, O. Müller, in: ACM SIGEnergy Energy Informatics Review, Association for Computing Machinery (ACM), 2025, pp. 4–10.' date_created: 2025-12-22T13:17:36Z date_updated: 2025-12-22T13:18:19Z doi: 10.1145/3757892.3757893 intvolume: ' 5' issue: '2' language: - iso: eng main_file_link: - open_access: '1' url: https://dl.acm.org/doi/abs/10.1145/3757892.3757893 oa: '1' page: 4-10 publication: ACM SIGEnergy Energy Informatics Review publication_identifier: issn: - 2770-5331 - 2770-5331 publication_status: published publisher: Association for Computing Machinery (ACM) status: public title: 'Causal Machine Learning Approaches for Modelling Data Center Heat Recovery: A Physical Testbed Study' type: conference user_id: '105506' volume: 5 year: '2025' ... --- _id: '63403' abstract: - lang: eng text: "Stateful signatures like the NIST standardized signature schemes LMS and XMSS provide an efficient and mature realization of post-quantum secure signature schemes. They are recommended for long-term use cases like e.g. firmware signing. However, stateful signature schemes require to properly manage a so-called state. In stateful signature schemes like LMS and XMSS, signing keys consist of a set of keys of a one-time signature scheme and it has to be guaranteed that each one-time key is used only once. This is done by updating a state in each signature computation, basically recording which one-time keys have already been used. While this is straightforward in centralized systems, in distributed systems like secure enclaves consisting of e.g. multiple hardware security modules (HSMs) with limited communication keeping a distributed state that at any point in time is consistent among all parties involved presents a challenge. This challenge is not addressed by the current standardization processes. \r\nIn this paper we present a security model for the distributed key management of post-quantum secure stateful signatures like XMSS and LMS. We also present a simple, efficient, and easy to implement protocol proven secure in this security model, i.e. the protocol guarantees at any point in time a consistent state among the parties in a distributed system, like a distributed security enclave. The security model is defined in the universal composabilty (UC) framework by Ran Canetti by providing an ideal functionality for the distributed key management for stateful signatures. Hence our protocol remains secure even if arbitrarily composed with other instances of the same or other protocols, a necessity for the security of distributed key management protocols. Our main application are security enclaves consisting of HSMs, but the model and the protocol can easily be adapted to other scenarios of distributed key management of stateful signature schemes." author: - first_name: Johannes full_name: Blömer, Johannes id: '23' last_name: Blömer - first_name: Henrik full_name: Bröcher, Henrik id: '41047' last_name: Bröcher orcid: 0009-0008-3938-5485 - first_name: Volker full_name: Krummel, Volker last_name: Krummel - first_name: Laurens Alexander full_name: Porzenheim, Laurens Alexander id: '47434' last_name: Porzenheim citation: ama: Blömer J, Bröcher H, Krummel V, Porzenheim LA. Secure Distributed State Management for Stateful Signatures with a Practical and Universally Composable Protocol. apa: Blömer, J., Bröcher, H., Krummel, V., & Porzenheim, L. A. (n.d.). Secure Distributed State Management for Stateful Signatures with a Practical and Universally Composable Protocol. bibtex: '@article{Blömer_Bröcher_Krummel_Porzenheim, title={Secure Distributed State Management for Stateful Signatures with a Practical and Universally Composable Protocol}, author={Blömer, Johannes and Bröcher, Henrik and Krummel, Volker and Porzenheim, Laurens Alexander} }' chicago: Blömer, Johannes, Henrik Bröcher, Volker Krummel, and Laurens Alexander Porzenheim. “Secure Distributed State Management for Stateful Signatures with a Practical and Universally Composable Protocol,” n.d. ieee: J. Blömer, H. Bröcher, V. Krummel, and L. A. Porzenheim, “Secure Distributed State Management for Stateful Signatures with a Practical and Universally Composable Protocol.” . mla: Blömer, Johannes, et al. Secure Distributed State Management for Stateful Signatures with a Practical and Universally Composable Protocol. short: J. Blömer, H. Bröcher, V. Krummel, L.A. Porzenheim, (n.d.). date_created: 2025-12-22T21:23:22Z date_updated: 2025-12-23T11:30:38Z department: - _id: '34' - _id: '64' keyword: - distributed state - hash-based signature - stateful hash-based signature - universal composability - secure enclave language: - iso: eng main_file_link: - open_access: '1' url: https://eprint.iacr.org/2025/2278.pdf oa: '1' page: '22' project: - _id: '191' name: 'PhoQuant: Photonische Quantencomputer - Quantencomputing Testplattform' publication_status: submitted status: public title: Secure Distributed State Management for Stateful Signatures with a Practical and Universally Composable Protocol type: preprint user_id: '41047' year: '2025' ... --- _id: '59091' abstract: - lang: eng text: Abstract. Liquid Metal Embrittlement (LME) cracking is a well-documented issue encountered during resistance spot welding (RSW) of zinc-coated advanced high-strength steels (AHSS) in automotive manufacturing. Given that existing research has predominantly focused on laboratory-scale samples and lacks investigation into the load-bearing capacity of joints under crash conditions, this study aims to fill these gaps by analyzing third-generation zinc-coated AHSS. S-Rail components were produced through stamping to replicate real-world manufacturing conditions and geometries of automotive parts. To account for the disturbances typically encountered in production, samples with LME cracks were intentionally fabricated. Subsequently, a modified three-point bending test, assisted by numerical simulations, was developed to effectively apply loads to the weld spots of the S-Rail components. Results from crash tests demonstrated that observed light crack severity does not significantly compromise the joint's load-bearing capacity or lead to earlier joint failure. author: - first_name: Keke full_name: Yang, Keke id: '65085' last_name: Yang orcid: 0000-0001-9201-9304 - first_name: Max full_name: Biegler, Max last_name: Biegler - first_name: Linus full_name: Happe, Linus last_name: Happe - first_name: Marius full_name: Striewe, Marius id: '30228' last_name: Striewe - first_name: Viktoria full_name: Olfert, Viktoria id: '5974' last_name: Olfert - first_name: David full_name: Hein, David id: '7728' last_name: Hein - first_name: 'Michael ' full_name: 'Rethmeier, Michael ' last_name: Rethmeier - first_name: Gerson full_name: Meschut, Gerson id: '32056' last_name: Meschut orcid: 0000-0002-2763-1246 citation: ama: 'Yang K, Biegler M, Happe L, et al. Influence of Liquid metal embrittlement on load-bearing capacity of resistance spot welds under crash loads: A study based on S-Rail components. In: Materials Research Proceedings. Vol 52. Materials Research Forum LLC; 2025. doi:10.21741/9781644903551-42' apa: 'Yang, K., Biegler, M., Happe, L., Striewe, M., Olfert, V., Hein, D., Rethmeier, M., & Meschut, G. (2025). Influence of Liquid metal embrittlement on load-bearing capacity of resistance spot welds under crash loads: A study based on S-Rail components. Materials Research Proceedings, 52. https://doi.org/10.21741/9781644903551-42' bibtex: '@inproceedings{Yang_Biegler_Happe_Striewe_Olfert_Hein_Rethmeier_Meschut_2025, title={Influence of Liquid metal embrittlement on load-bearing capacity of resistance spot welds under crash loads: A study based on S-Rail components}, volume={52}, DOI={10.21741/9781644903551-42}, booktitle={Materials Research Proceedings}, publisher={Materials Research Forum LLC}, author={Yang, Keke and Biegler, Max and Happe, Linus and Striewe, Marius and Olfert, Viktoria and Hein, David and Rethmeier, Michael and Meschut, Gerson}, year={2025} }' chicago: 'Yang, Keke, Max Biegler, Linus Happe, Marius Striewe, Viktoria Olfert, David Hein, Michael Rethmeier, and Gerson Meschut. “Influence of Liquid Metal Embrittlement on Load-Bearing Capacity of Resistance Spot Welds under Crash Loads: A Study Based on S-Rail Components.” In Materials Research Proceedings, Vol. 52. Materials Research Forum LLC, 2025. https://doi.org/10.21741/9781644903551-42.' ieee: 'K. Yang et al., “Influence of Liquid metal embrittlement on load-bearing capacity of resistance spot welds under crash loads: A study based on S-Rail components,” in Materials Research Proceedings, 2025, vol. 52, doi: 10.21741/9781644903551-42.' mla: 'Yang, Keke, et al. “Influence of Liquid Metal Embrittlement on Load-Bearing Capacity of Resistance Spot Welds under Crash Loads: A Study Based on S-Rail Components.” Materials Research Proceedings, vol. 52, Materials Research Forum LLC, 2025, doi:10.21741/9781644903551-42.' short: 'K. Yang, M. Biegler, L. Happe, M. Striewe, V. Olfert, D. Hein, M. Rethmeier, G. Meschut, in: Materials Research Proceedings, Materials Research Forum LLC, 2025.' date_created: 2025-03-25T07:59:49Z date_updated: 2025-12-26T13:44:36Z ddc: - '600' department: - _id: '157' doi: 10.21741/9781644903551-42 file: - access_level: closed content_type: application/pdf creator: kekeyang date_created: 2025-03-25T08:02:30Z date_updated: 2025-03-25T08:02:30Z file_id: '59092' file_name: Shemat.pdf file_size: 1901767 relation: main_file success: 1 file_date_updated: 2025-03-25T08:02:30Z has_accepted_license: '1' intvolume: ' 52' language: - iso: eng license: https://creativecommons.org/licenses/by-nc/3.0/ main_file_link: - open_access: '1' oa: '1' publication: Materials Research Proceedings publication_identifier: issn: - 2474-395X publication_status: published publisher: Materials Research Forum LLC quality_controlled: '1' status: public title: 'Influence of Liquid metal embrittlement on load-bearing capacity of resistance spot welds under crash loads: A study based on S-Rail components' type: conference user_id: '65085' volume: 52 year: '2025' ... --- _id: '60604' abstract: - lang: eng text: Abstract. In the field of online condition monitoring, non-destructive testing methods using active acoustic testing [1] emerged as innovative tools. These techniques are particularly effective because damage in joined structures leads to significant changes in their vibrational characteristics. However, the consistent use of online condition monitoring through active acoustic testing combined with complex pattern recognition for early crack detection in joined components has not yet been fully established. This research aims to develop an online crack detection system employing pattern recognition techniques under cyclic loading during fatigue tests, utilizing non-contact active acoustic testing with laser vibrometry. Due to the wide range of materials that can be joined, mechanical joining processes can be used in many different industry branches. Self-pierce riveting (SPR), in particular, is a well-established joining process. Therefore, the investigations for online crack detection initially focus on SPR joints. To achieve this, the fatigue behavior of SPR joints in a lap-shear configuration was characterized. Experimental fatigue testing demonstrated that SPR joint failure occurs either through cracks propagating in the sheet material away from the rivet or in the rivet foot, depending on the material combination. Laser vibrometry has been successfully used as a crack detection system and has proven to be effective in detecting crack initiation in SPR joints. Cracks can be detected without contact regardless of the material combination, the damage location, the size of the damage, or the type of damage. The optimization of the crack detection system involved several key enhancements, including adjusting data acquisition to improve crack detection, incorporating principal component analysis (PCA) to reduce dimensionality, and implementing a classification model based on a global training dataset. An intuitive, problem-specific software demonstrator for analyzing the crack initiation behavior of SPR joints under cyclic loading was developed and iteratively optimized. Future work will focus on the implementation of an autoencoder network to further enhance crack detection capabilities. author: - first_name: Viktoria full_name: Olfert, Viktoria id: '5974' last_name: Olfert - first_name: Keke full_name: Yang, Keke id: '65085' last_name: Yang orcid: 0000-0001-9201-9304 - first_name: Maik full_name: Gollnick, Maik last_name: Gollnick - first_name: Jacob full_name: Krause, Jacob last_name: Krause - first_name: David full_name: Hein, David id: '7728' last_name: Hein - first_name: Gerson full_name: Meschut, Gerson id: '32056' last_name: Meschut orcid: 0000-0002-2763-1246 citation: ama: 'Olfert V, Yang K, Gollnick M, Krause J, Hein D, Meschut G. Analysis of fatigue behaviour of self-piercing riveted joints under cyclic loading using laser vibrometry. In: Materials Research Proceedings. Vol 54. Materials Research Forum LLC; 2025. doi:10.21741/9781644903599-154' apa: Olfert, V., Yang, K., Gollnick, M., Krause, J., Hein, D., & Meschut, G. (2025). Analysis of fatigue behaviour of self-piercing riveted joints under cyclic loading using laser vibrometry. Materials Research Proceedings, 54. https://doi.org/10.21741/9781644903599-154 bibtex: '@inproceedings{Olfert_Yang_Gollnick_Krause_Hein_Meschut_2025, title={Analysis of fatigue behaviour of self-piercing riveted joints under cyclic loading using laser vibrometry}, volume={54}, DOI={10.21741/9781644903599-154}, booktitle={Materials Research Proceedings}, publisher={Materials Research Forum LLC}, author={Olfert, Viktoria and Yang, Keke and Gollnick, Maik and Krause, Jacob and Hein, David and Meschut, Gerson}, year={2025} }' chicago: Olfert, Viktoria, Keke Yang, Maik Gollnick, Jacob Krause, David Hein, and Gerson Meschut. “Analysis of Fatigue Behaviour of Self-Piercing Riveted Joints under Cyclic Loading Using Laser Vibrometry.” In Materials Research Proceedings, Vol. 54. Materials Research Forum LLC, 2025. https://doi.org/10.21741/9781644903599-154. ieee: 'V. Olfert, K. Yang, M. Gollnick, J. Krause, D. Hein, and G. Meschut, “Analysis of fatigue behaviour of self-piercing riveted joints under cyclic loading using laser vibrometry,” in Materials Research Proceedings, 2025, vol. 54, doi: 10.21741/9781644903599-154.' mla: Olfert, Viktoria, et al. “Analysis of Fatigue Behaviour of Self-Piercing Riveted Joints under Cyclic Loading Using Laser Vibrometry.” Materials Research Proceedings, vol. 54, Materials Research Forum LLC, 2025, doi:10.21741/9781644903599-154. short: 'V. Olfert, K. Yang, M. Gollnick, J. Krause, D. Hein, G. Meschut, in: Materials Research Proceedings, Materials Research Forum LLC, 2025.' date_created: 2025-07-14T13:25:26Z date_updated: 2025-12-26T13:45:01Z department: - _id: '157' doi: 10.21741/9781644903599-154 intvolume: ' 54' language: - iso: eng main_file_link: - open_access: '1' oa: '1' publication: Materials Research Proceedings publication_identifier: issn: - 2474-395X publication_status: published publisher: Materials Research Forum LLC quality_controlled: '1' status: public title: Analysis of fatigue behaviour of self-piercing riveted joints under cyclic loading using laser vibrometry type: conference user_id: '65085' volume: 54 year: '2025' ... --- _id: '63434' author: - first_name: Max full_name: Hoffmann, Max last_name: Hoffmann citation: ama: 'Hoffmann M. Using scriptwriting as a response format for interface tasks: Exemplary analyses in the context of symmetry. In: Bosch M, Bolondi G, Carreira S, Michael G, Camilla S, eds. Proceedings of the Fourteenth Congress of the European Society for Research in Mathematics Education (CERME14). ; 2025.' apa: 'Hoffmann, M. (2025). Using scriptwriting as a response format for interface tasks: Exemplary analyses in the context of symmetry. In M. Bosch, G. Bolondi, S. Carreira, G. Michael, & S. Camilla (Eds.), Proceedings of the Fourteenth Congress of the European Society for Research in Mathematics Education (CERME14).' bibtex: '@inproceedings{Hoffmann_2025, title={Using scriptwriting as a response format for interface tasks: Exemplary analyses in the context of symmetry}, booktitle={Proceedings of the Fourteenth Congress of the European Society for Research in Mathematics Education (CERME14)}, author={Hoffmann, Max}, editor={Bosch, Marianna and Bolondi, Giorgio and Carreira, Susana and Michael, Gaidoschik and Camilla, Spagnolo}, year={2025} }' chicago: 'Hoffmann, Max. “Using Scriptwriting as a Response Format for Interface Tasks: Exemplary Analyses in the Context of Symmetry.” In Proceedings of the Fourteenth Congress of the European Society for Research in Mathematics Education (CERME14), edited by Marianna Bosch, Giorgio Bolondi, Susana Carreira, Gaidoschik Michael, and Spagnolo Camilla, 2025.' ieee: 'M. Hoffmann, “Using scriptwriting as a response format for interface tasks: Exemplary analyses in the context of symmetry,” in Proceedings of the Fourteenth Congress of the European Society for Research in Mathematics Education (CERME14), 2025.' mla: 'Hoffmann, Max. “Using Scriptwriting as a Response Format for Interface Tasks: Exemplary Analyses in the Context of Symmetry.” Proceedings of the Fourteenth Congress of the European Society for Research in Mathematics Education (CERME14), edited by Marianna Bosch et al., 2025.' short: 'M. Hoffmann, in: M. Bosch, G. Bolondi, S. Carreira, G. Michael, S. Camilla (Eds.), Proceedings of the Fourteenth Congress of the European Society for Research in Mathematics Education (CERME14), 2025.' date_created: 2026-01-04T21:26:04Z date_updated: 2026-01-04T21:29:36Z department: - _id: '97' - _id: '643' editor: - first_name: Marianna full_name: Bosch, Marianna last_name: Bosch - first_name: Giorgio full_name: Bolondi, Giorgio last_name: Bolondi - first_name: Susana full_name: Carreira, Susana last_name: Carreira - first_name: Gaidoschik full_name: Michael, Gaidoschik last_name: Michael - first_name: Spagnolo full_name: Camilla, Spagnolo last_name: Camilla keyword: - hoffmann - reviewed - proceedings language: - iso: eng main_file_link: - open_access: '1' url: https://hal.science/CERME14/hal-05237875v1 oa: '1' publication: Proceedings of the Fourteenth Congress of the European Society for Research in Mathematics Education (CERME14) quality_controlled: '1' status: public title: 'Using scriptwriting as a response format for interface tasks: Exemplary analyses in the context of symmetry' type: conference user_id: '32202' year: '2025' ... --- _id: '62000' article_type: original author: - first_name: Leander full_name: Claes, Leander id: '11829' last_name: Claes orcid: 0000-0002-4393-268X - first_name: Kevin full_name: Koch, Kevin last_name: Koch - first_name: Olga full_name: Friesen, Olga id: '44026' last_name: Friesen - first_name: Lars full_name: Meihost, Lars id: '24769' last_name: Meihost citation: ama: Claes L, Koch K, Friesen O, Meihost L. Machine Learning-Supported Inverse Measurement Procedure for Broadband, Temperature Dependent Piezoelectric Material Parameters. Acta Acustica. 2025;9(65). doi:10.1051/aacus/2025044 apa: Claes, L., Koch, K., Friesen, O., & Meihost, L. (2025). Machine Learning-Supported Inverse Measurement Procedure for Broadband, Temperature Dependent Piezoelectric Material Parameters. Acta Acustica, 9(65). https://doi.org/10.1051/aacus/2025044 bibtex: '@article{Claes_Koch_Friesen_Meihost_2025, title={Machine Learning-Supported Inverse Measurement Procedure for Broadband, Temperature Dependent Piezoelectric Material Parameters}, volume={9}, DOI={10.1051/aacus/2025044}, number={65}, journal={Acta Acustica}, publisher={EDP Sciences}, author={Claes, Leander and Koch, Kevin and Friesen, Olga and Meihost, Lars}, year={2025} }' chicago: Claes, Leander, Kevin Koch, Olga Friesen, and Lars Meihost. “Machine Learning-Supported Inverse Measurement Procedure for Broadband, Temperature Dependent Piezoelectric Material Parameters.” Acta Acustica 9, no. 65 (2025). https://doi.org/10.1051/aacus/2025044. ieee: 'L. Claes, K. Koch, O. Friesen, and L. Meihost, “Machine Learning-Supported Inverse Measurement Procedure for Broadband, Temperature Dependent Piezoelectric Material Parameters,” Acta Acustica, vol. 9, no. 65, 2025, doi: 10.1051/aacus/2025044.' mla: Claes, Leander, et al. “Machine Learning-Supported Inverse Measurement Procedure for Broadband, Temperature Dependent Piezoelectric Material Parameters.” Acta Acustica, vol. 9, no. 65, EDP Sciences, 2025, doi:10.1051/aacus/2025044. short: L. Claes, K. Koch, O. Friesen, L. Meihost, Acta Acustica 9 (2025). date_created: 2025-10-27T08:20:53Z date_updated: 2026-01-05T08:00:05Z department: - _id: '49' doi: 10.1051/aacus/2025044 intvolume: ' 9' issue: '65' language: - iso: eng main_file_link: - open_access: '1' url: https://acta-acustica.edpsciences.org/articles/aacus/abs/2025/01/aacus250049/aacus250049.html oa: '1' project: - _id: '52' name: Computing Resources Provided by the Paderborn Center for Parallel Computing - _id: '245' name: 'FOR 5208: Modellbasierte Bestimmung nichtlinearer Eigenschaften von Piezokeramiken für Leistungsschallanwendungen (NEPTUN)' publication: Acta Acustica publication_identifier: issn: - 2681-4617 publication_status: published publisher: EDP Sciences status: public title: Machine Learning-Supported Inverse Measurement Procedure for Broadband, Temperature Dependent Piezoelectric Material Parameters type: journal_article user_id: '11829' volume: 9 year: '2025' ... --- _id: '54837' author: - first_name: Leander full_name: Claes, Leander id: '11829' last_name: Claes orcid: 0000-0002-4393-268X - first_name: Johannes full_name: Lankeit, Johannes last_name: Lankeit - first_name: Michael full_name: Winkler, Michael id: '31496' last_name: Winkler citation: ama: 'Claes L, Lankeit J, Winkler M. A model for heat generation by acoustic waves in piezoelectric materials: Global large-data solutions. Mathematical Models and Methods in Applied Sciences. 2025;35(11):2465-2512. doi:10.1142/s0218202525500447' apa: 'Claes, L., Lankeit, J., & Winkler, M. (2025). A model for heat generation by acoustic waves in piezoelectric materials: Global large-data solutions. Mathematical Models and Methods in Applied Sciences, 35(11), 2465–2512. https://doi.org/10.1142/s0218202525500447' bibtex: '@article{Claes_Lankeit_Winkler_2025, title={A model for heat generation by acoustic waves in piezoelectric materials: Global large-data solutions}, volume={35}, DOI={10.1142/s0218202525500447}, number={11}, journal={Mathematical Models and Methods in Applied Sciences}, publisher={World Scientific Pub Co Pte Ltd}, author={Claes, Leander and Lankeit, Johannes and Winkler, Michael}, year={2025}, pages={2465–2512} }' chicago: 'Claes, Leander, Johannes Lankeit, and Michael Winkler. “A Model for Heat Generation by Acoustic Waves in Piezoelectric Materials: Global Large-Data Solutions.” Mathematical Models and Methods in Applied Sciences 35, no. 11 (2025): 2465–2512. https://doi.org/10.1142/s0218202525500447.' ieee: 'L. Claes, J. Lankeit, and M. Winkler, “A model for heat generation by acoustic waves in piezoelectric materials: Global large-data solutions,” Mathematical Models and Methods in Applied Sciences, vol. 35, no. 11, pp. 2465–2512, 2025, doi: 10.1142/s0218202525500447.' mla: 'Claes, Leander, et al. “A Model for Heat Generation by Acoustic Waves in Piezoelectric Materials: Global Large-Data Solutions.” Mathematical Models and Methods in Applied Sciences, vol. 35, no. 11, World Scientific Pub Co Pte Ltd, 2025, pp. 2465–512, doi:10.1142/s0218202525500447.' short: L. Claes, J. Lankeit, M. Winkler, Mathematical Models and Methods in Applied Sciences 35 (2025) 2465–2512. date_created: 2024-06-20T13:43:42Z date_updated: 2026-01-05T07:59:41Z department: - _id: '90' - _id: '49' doi: 10.1142/s0218202525500447 external_id: arxiv: - '2411.14900' intvolume: ' 35' issue: '11' language: - iso: eng main_file_link: - open_access: '1' url: https://arxiv.org/pdf/2411.14900 oa: '1' page: 2465-2512 project: - _id: '245' name: 'FOR 5208: Modellbasierte Bestimmung nichtlinearer Eigenschaften von Piezokeramiken für Leistungsschallanwendungen (NEPTUN)' publication: Mathematical Models and Methods in Applied Sciences publication_identifier: issn: - 1793-6314 publisher: World Scientific Pub Co Pte Ltd status: public title: 'A model for heat generation by acoustic waves in piezoelectric materials: Global large-data solutions' type: journal_article user_id: '11829' volume: 35 year: '2025' ... --- _id: '59689' author: - first_name: Olga full_name: Friesen, Olga id: '44026' last_name: Friesen - first_name: Lars full_name: Meihost, Lars id: '24769' last_name: Meihost - first_name: Kevin full_name: Koch, Kevin last_name: Koch - first_name: Leander full_name: Claes, Leander id: '11829' last_name: Claes orcid: 0000-0002-4393-268X - first_name: Bernd full_name: Henning, Bernd id: '213' last_name: Henning citation: ama: 'Friesen O, Meihost L, Koch K, Claes L, Henning B. Estimation of piezoelectric material parameters under varying electric field conditions. In: ; 2025. doi:10.71568/DASDAGA2025.078' apa: Friesen, O., Meihost, L., Koch, K., Claes, L., & Henning, B. (2025). Estimation of piezoelectric material parameters under varying electric field conditions. DAS | DAGA 2025 - 51st Annual Meeting on Acoustics, Copenhagen. https://doi.org/10.71568/DASDAGA2025.078 bibtex: '@inproceedings{Friesen_Meihost_Koch_Claes_Henning_2025, title={Estimation of piezoelectric material parameters under varying electric field conditions}, DOI={10.71568/DASDAGA2025.078}, author={Friesen, Olga and Meihost, Lars and Koch, Kevin and Claes, Leander and Henning, Bernd}, year={2025} }' chicago: Friesen, Olga, Lars Meihost, Kevin Koch, Leander Claes, and Bernd Henning. “Estimation of Piezoelectric Material Parameters under Varying Electric Field Conditions,” 2025. https://doi.org/10.71568/DASDAGA2025.078. ieee: 'O. Friesen, L. Meihost, K. Koch, L. Claes, and B. Henning, “Estimation of piezoelectric material parameters under varying electric field conditions,” presented at the DAS | DAGA 2025 - 51st Annual Meeting on Acoustics, Copenhagen, 2025, doi: 10.71568/DASDAGA2025.078.' mla: Friesen, Olga, et al. Estimation of Piezoelectric Material Parameters under Varying Electric Field Conditions. 2025, doi:10.71568/DASDAGA2025.078. short: 'O. Friesen, L. Meihost, K. Koch, L. Claes, B. Henning, in: 2025.' conference: end_date: 2025-03-20 location: Copenhagen name: DAS | DAGA 2025 - 51st Annual Meeting on Acoustics start_date: 2025-03-17 date_created: 2025-04-25T08:51:32Z date_updated: 2026-01-05T08:02:20Z department: - _id: '49' doi: 10.71568/DASDAGA2025.078 language: - iso: eng main_file_link: - open_access: '1' oa: '1' project: - _id: '52' name: 'PC2: Computing Resources Provided by the Paderborn Center for Parallel Computing' - _id: '245' name: 'FOR 5208: Modellbasierte Bestimmung nichtlinearer Eigenschaften von Piezokeramiken für Leistungsschallanwendungen (NEPTUN)' status: public title: Estimation of piezoelectric material parameters under varying electric field conditions type: conference user_id: '11829' year: '2025' ... --- _id: '59056' author: - first_name: Karl full_name: Seeger, Karl last_name: Seeger - first_name: Matteo full_name: Genovese, Matteo last_name: Genovese - first_name: Alexander full_name: Schlüter, Alexander id: '103302' last_name: Schlüter orcid: 0000-0002-2569-1624 - first_name: Christina full_name: Kockel, Christina last_name: Kockel - first_name: Orlando full_name: Corigliano, Orlando last_name: Corigliano - first_name: Edith Benjamina full_name: Díaz Canales, Edith Benjamina id: '105704' last_name: Díaz Canales orcid: 0009-0007-2748-0074 - first_name: Aaron full_name: Praktiknjo, Aaron last_name: Praktiknjo - first_name: Petronilla full_name: Fragiacomo, Petronilla last_name: Fragiacomo citation: ama: 'Seeger K, Genovese M, Schlüter A, et al. Techno-economic analysis of hydrogen and green fuels supply scenarios assessing three import routes: Canada, Chile, and Algeria to Germany. International Journal of Hydrogen Energy. 2025;116:558-576. doi:10.1016/j.ijhydene.2025.02.379' apa: 'Seeger, K., Genovese, M., Schlüter, A., Kockel, C., Corigliano, O., Díaz Canales, E. B., Praktiknjo, A., & Fragiacomo, P. (2025). Techno-economic analysis of hydrogen and green fuels supply scenarios assessing three import routes: Canada, Chile, and Algeria to Germany. International Journal of Hydrogen Energy, 116, 558–576. https://doi.org/10.1016/j.ijhydene.2025.02.379' bibtex: '@article{Seeger_Genovese_Schlüter_Kockel_Corigliano_Díaz Canales_Praktiknjo_Fragiacomo_2025, title={Techno-economic analysis of hydrogen and green fuels supply scenarios assessing three import routes: Canada, Chile, and Algeria to Germany}, volume={116}, DOI={10.1016/j.ijhydene.2025.02.379}, journal={International Journal of Hydrogen Energy}, publisher={Elsevier BV}, author={Seeger, Karl and Genovese, Matteo and Schlüter, Alexander and Kockel, Christina and Corigliano, Orlando and Díaz Canales, Edith Benjamina and Praktiknjo, Aaron and Fragiacomo, Petronilla}, year={2025}, pages={558–576} }' chicago: 'Seeger, Karl, Matteo Genovese, Alexander Schlüter, Christina Kockel, Orlando Corigliano, Edith Benjamina Díaz Canales, Aaron Praktiknjo, and Petronilla Fragiacomo. “Techno-Economic Analysis of Hydrogen and Green Fuels Supply Scenarios Assessing Three Import Routes: Canada, Chile, and Algeria to Germany.” International Journal of Hydrogen Energy 116 (2025): 558–76. https://doi.org/10.1016/j.ijhydene.2025.02.379.' ieee: 'K. Seeger et al., “Techno-economic analysis of hydrogen and green fuels supply scenarios assessing three import routes: Canada, Chile, and Algeria to Germany,” International Journal of Hydrogen Energy, vol. 116, pp. 558–576, 2025, doi: 10.1016/j.ijhydene.2025.02.379.' mla: 'Seeger, Karl, et al. “Techno-Economic Analysis of Hydrogen and Green Fuels Supply Scenarios Assessing Three Import Routes: Canada, Chile, and Algeria to Germany.” International Journal of Hydrogen Energy, vol. 116, Elsevier BV, 2025, pp. 558–76, doi:10.1016/j.ijhydene.2025.02.379.' short: K. Seeger, M. Genovese, A. Schlüter, C. Kockel, O. Corigliano, E.B. Díaz Canales, A. Praktiknjo, P. Fragiacomo, International Journal of Hydrogen Energy 116 (2025) 558–576. date_created: 2025-03-18T08:57:46Z date_updated: 2026-01-06T08:01:01Z department: - _id: '876' - _id: '9' - _id: '393' - _id: '321' doi: 10.1016/j.ijhydene.2025.02.379 intvolume: ' 116' language: - iso: eng main_file_link: - open_access: '1' url: https://doi.org/10.1016/j.ijhydene.2025.02.379 oa: '1' page: 558-576 publication: International Journal of Hydrogen Energy publication_identifier: issn: - 0360-3199 publication_status: published publisher: Elsevier BV quality_controlled: '1' status: public title: 'Techno-economic analysis of hydrogen and green fuels supply scenarios assessing three import routes: Canada, Chile, and Algeria to Germany' type: journal_article user_id: '103302' volume: 116 year: '2025' ... --- _id: '60837' abstract: - lang: eng text: "In light of growing demands for resource efficiency and sustainability in vehicle engineering, the environmentally compatible separation of structural adhesive joints is gaining increasing relevance. This study presents a comparative analysis of two physically based debonding methods: the established hot-air process and a cryogenic cold process based on liquid nitrogen (LN2). The primary objective is to assess the ecological impact and process-related sustainability of both approaches.\r\nExperimental investigations were conducted on a component-representative triple-sheet structure that simulates common automotive flange joints. Thermal input was applied either by convective heating using a hot air gun or by direct cooling through a contact-based LN2 tool. The resulting temperature profiles were recorded using spatially distributed thermocouples. Subsequently, the outer panel was selectively debonded to replicate a repair scenario, and the mechanical integrity of the remaining adhesive joint was evaluated through Mode I testing of L-shaped specimens. Process data served as input for an Life Cycle Assessment (LCA) according to DIN EN ISO 14040.\r\nThe cryogenic method achieved a 40% reduction in carbon footprint compared to the hot-air process (0.337 kg vs. 0.559 kg CO2-equivalents), primarily due to its shorter process time and more efficient heat transfer. While the hot-air method’s impact is mainly driven by electrical energy use, that of the cold method stems from cryogenic media consumption. Notwithstanding certain disadvantages in specific impact categories, the LN2-based process exhibits a superior overall ecological performance and signifies a promising solution for repair- and recycling-oriented adhesive separation in structural vehicle applications." article_number: '100332' article_type: original author: - first_name: Alex full_name: Jordan, Alex id: '62451' last_name: Jordan orcid: 0009-0007-9546-6071 - first_name: Lucas full_name: Hermelingmeier, Lucas id: '58649' last_name: Hermelingmeier - first_name: Julian full_name: Gilich, Julian id: '44391' last_name: Gilich - first_name: Gerson full_name: Meschut, Gerson id: '32056' last_name: Meschut orcid: 0000-0002-2763-1246 - first_name: Marco Sebastian full_name: De Santis, Marco Sebastian id: '52239' last_name: De Santis - first_name: Alexander full_name: Schlüter, Alexander id: '103302' last_name: Schlüter orcid: 0000-0002-2569-1624 citation: ama: Jordan A, Hermelingmeier L, Gilich J, Meschut G, De Santis MS, Schlüter A. Comparison of the economic efficiency and sustainability of two debonding processes for structurally bonded sills. Journal of Advanced Joining Processes. 2025;12. doi:10.1016/j.jajp.2025.100332 apa: Jordan, A., Hermelingmeier, L., Gilich, J., Meschut, G., De Santis, M. S., & Schlüter, A. (2025). Comparison of the economic efficiency and sustainability of two debonding processes for structurally bonded sills. Journal of Advanced Joining Processes, 12, Article 100332. https://doi.org/10.1016/j.jajp.2025.100332 bibtex: '@article{Jordan_Hermelingmeier_Gilich_Meschut_De Santis_Schlüter_2025, title={Comparison of the economic efficiency and sustainability of two debonding processes for structurally bonded sills}, volume={12}, DOI={10.1016/j.jajp.2025.100332}, number={100332}, journal={Journal of Advanced Joining Processes}, publisher={Elsevier}, author={Jordan, Alex and Hermelingmeier, Lucas and Gilich, Julian and Meschut, Gerson and De Santis, Marco Sebastian and Schlüter, Alexander}, year={2025} }' chicago: Jordan, Alex, Lucas Hermelingmeier, Julian Gilich, Gerson Meschut, Marco Sebastian De Santis, and Alexander Schlüter. “Comparison of the Economic Efficiency and Sustainability of Two Debonding Processes for Structurally Bonded Sills.” Journal of Advanced Joining Processes 12 (2025). https://doi.org/10.1016/j.jajp.2025.100332. ieee: 'A. Jordan, L. Hermelingmeier, J. Gilich, G. Meschut, M. S. De Santis, and A. Schlüter, “Comparison of the economic efficiency and sustainability of two debonding processes for structurally bonded sills,” Journal of Advanced Joining Processes, vol. 12, Art. no. 100332, 2025, doi: 10.1016/j.jajp.2025.100332.' mla: Jordan, Alex, et al. “Comparison of the Economic Efficiency and Sustainability of Two Debonding Processes for Structurally Bonded Sills.” Journal of Advanced Joining Processes, vol. 12, 100332, Elsevier, 2025, doi:10.1016/j.jajp.2025.100332. short: A. Jordan, L. Hermelingmeier, J. Gilich, G. Meschut, M.S. De Santis, A. Schlüter, Journal of Advanced Joining Processes 12 (2025). date_created: 2025-07-30T11:04:28Z date_updated: 2026-01-06T08:22:54Z department: - _id: '157' - _id: '876' - _id: '321' - _id: '9' doi: 10.1016/j.jajp.2025.100332 intvolume: ' 12' keyword: - Sustainable debonding - Structural adhesives - Sustainable joining technologies - Life Cycle Assessment (LCA) - Automotive repair process - Economically efficient debonding language: - iso: eng main_file_link: - open_access: '1' url: https://www.sciencedirect.com/science/article/pii/S2666330925000536?via%3Dihub oa: '1' publication: Journal of Advanced Joining Processes publication_identifier: issn: - 2666-3309 publication_status: published publisher: Elsevier quality_controlled: '1' status: public title: Comparison of the economic efficiency and sustainability of two debonding processes for structurally bonded sills type: journal_article user_id: '103302' volume: 12 year: '2025' ... --- _id: '63209' abstract: - lang: ger text: 'Die DFG-Projekte AddFeRo-PM (406108415) und AddFeRo-SR (465089065) untersuchten die Potenziale des LB-PBF/M-Verfahrens zur Herstellung von Rotoren für unterschiedliche elektrische Maschinen. Im interdisziplinären Ansatz wurden Materialentwicklung und mechanische sowie elektromagnetische Optimierung verbunden. Im Projekt „AddFeRo-PM“ wurde der Rotor einer permanentmagneterregten Synchron- maschine (PMSM) untersucht. FeSi erwies sich als geeignete Legierung, konnte aber wegen Spannungsrissen nur bis zu 3 % Siliziumanteil (kurz: FeSi3) verarbeitet werden. Mechanische und elektromagnetische Untersuchungen ermöglichten eine 3D-Optimierung der Rotorgeometrie und -struktur. Der Demonstrator wurde additiv gefertigt und zeigt Leicht-baupotenziale sowie reduzierte Drehmomentwelligkeit. Im Folgeprojekt „AddFeRo-SR“ kam eine Hochtemperatur-Bauraumheizung (HTBH) zum Einsatz, die FeSi mit 6,5 % Siliziumanteil verarbeitbar machte, welches bessere elektro- magnetische Eigenschaften bietet. Sie wurde bei einer Synchron-Reluktanzmaschine (SynRM) getestet. Eine hybride Rotorfertigung erwies sich jedoch aufgrund von HTBH-Einschränkungen als ungeeignet, weshalb eine einteilige Fertigung mit FeSi3 umgesetzt wurde. Experimente bestätigten vergleichbare Betriebsergebnisse zur konventionellen Fertigung bei reduzierter Rotormasse. Zusätzlich wurde eine Methodik entwickelt, um additive Verfahren als Ergänzung zur konventionellen Fertigung zu integrieren. Beide Projekte zeigen das Potenzial additiver Fertigung für Leichtbau und Wirkungsgradsteigerung im Elektromaschinenbau und bieten wertvolle Grundlagen für industrielle Anwendungen.' author: - first_name: Michael full_name: Haase, Michael id: '35970' last_name: Haase - first_name: Marius full_name: Behrendt, Marius last_name: Behrendt - first_name: Florian full_name: Hengsbach, Florian id: '14073' last_name: Hengsbach - first_name: Vinay full_name: Kunnathully Sathees Kumar, Vinay id: '60979' last_name: Kunnathully Sathees Kumar - first_name: Sebastian full_name: Magerkohl, Sebastian id: '28520' last_name: Magerkohl - first_name: Balázs full_name: Magyar, Balázs id: '97759' last_name: Magyar - first_name: Bernd full_name: Ponick, Bernd last_name: Ponick - first_name: Mirko full_name: Schaper, Mirko id: '43720' last_name: Schaper - first_name: Detmar full_name: Zimmer, Detmar id: '604' last_name: Zimmer citation: ama: 'Haase M, Behrendt M, Hengsbach F, et al. Additive Fertigung im Elektromaschinenbau: Erforschung von Potentialen der additiven Fertigung in Rotoren permanentmagneterregter Synchronmaschinen. Technische Informationsbibliothek; 2025. doi:10.34657/26753' apa: 'Haase, M., Behrendt, M., Hengsbach, F., Kunnathully Sathees Kumar, V., Magerkohl, S., Magyar, B., Ponick, B., Schaper, M., & Zimmer, D. (2025). Additive Fertigung im Elektromaschinenbau: Erforschung von Potentialen der additiven Fertigung in Rotoren permanentmagneterregter Synchronmaschinen. Technische Informationsbibliothek. https://doi.org/10.34657/26753' bibtex: '@book{Haase_Behrendt_Hengsbach_Kunnathully Sathees Kumar_Magerkohl_Magyar_Ponick_Schaper_Zimmer_2025, place={Hannover}, title={Additive Fertigung im Elektromaschinenbau: Erforschung von Potentialen der additiven Fertigung in Rotoren permanentmagneterregter Synchronmaschinen}, DOI={10.34657/26753}, publisher={Technische Informationsbibliothek}, author={Haase, Michael and Behrendt, Marius and Hengsbach, Florian and Kunnathully Sathees Kumar, Vinay and Magerkohl, Sebastian and Magyar, Balázs and Ponick, Bernd and Schaper, Mirko and Zimmer, Detmar}, year={2025} }' chicago: 'Haase, Michael, Marius Behrendt, Florian Hengsbach, Vinay Kunnathully Sathees Kumar, Sebastian Magerkohl, Balázs Magyar, Bernd Ponick, Mirko Schaper, and Detmar Zimmer. Additive Fertigung im Elektromaschinenbau: Erforschung von Potentialen der additiven Fertigung in Rotoren permanentmagneterregter Synchronmaschinen. Hannover: Technische Informationsbibliothek, 2025. https://doi.org/10.34657/26753.' ieee: 'M. Haase et al., Additive Fertigung im Elektromaschinenbau: Erforschung von Potentialen der additiven Fertigung in Rotoren permanentmagneterregter Synchronmaschinen. Hannover: Technische Informationsbibliothek, 2025.' mla: 'Haase, Michael, et al. Additive Fertigung im Elektromaschinenbau: Erforschung von Potentialen der additiven Fertigung in Rotoren permanentmagneterregter Synchronmaschinen. Technische Informationsbibliothek, 2025, doi:10.34657/26753.' short: 'M. Haase, M. Behrendt, F. Hengsbach, V. Kunnathully Sathees Kumar, S. Magerkohl, B. Magyar, B. Ponick, M. Schaper, D. Zimmer, Additive Fertigung im Elektromaschinenbau: Erforschung von Potentialen der additiven Fertigung in Rotoren permanentmagneterregter Synchronmaschinen, Technische Informationsbibliothek, Hannover, 2025.' date_created: 2025-12-18T12:14:12Z date_updated: 2026-01-06T08:09:33Z department: - _id: '146' - _id: '158' doi: 10.34657/26753 has_accepted_license: '1' keyword: - Additive Fertigung - Elektromotor - Leichtbau - Synchronmotor - DFG language: - iso: ger main_file_link: - open_access: '1' url: https://oa.tib.eu/renate/bitstreams/9121e5bb-d113-4cfe-8fc6-610465afcd66/download oa: '1' place: Hannover publication_status: published publisher: Technische Informationsbibliothek status: public title: 'Additive Fertigung im Elektromaschinenbau: Erforschung von Potentialen der additiven Fertigung in Rotoren permanentmagneterregter Synchronmaschinen' type: report user_id: '97759' year: '2025' ... --- _id: '61753' abstract: - lang: eng text: This paper presents LOLA, a massively multilingual large language model trained on more than 160 languages using a sparse Mixture-of-Experts Transformer architecture. Our architectural and implementation choices address the challenge of harnessing linguistic diversity while maintaining efficiency and avoiding the common pitfalls of multilinguality. Our analysis of the evaluation results shows competitive performance in natural language generation and understanding tasks. Additionally, we demonstrate how the learned expert-routing mechanism exploits implicit phylogenetic linguistic patterns to potentially alleviate the curse of multilinguality. We provide an in-depth look at the training process, an analysis of the datasets, and a balanced exploration of the model{’}s strengths and limitations. As an open-source model, LOLA promotes reproducibility and serves as a robust foundation for future research. Our findings enable the development of compute-efficient multilingual models with strong, scalable performance across languages. author: - first_name: Nikit full_name: Srivastava, Nikit id: '70066' last_name: Srivastava orcid: 0009-0004-5164-4911 - first_name: Denis full_name: Kuchelev, Denis id: '70842' last_name: Kuchelev - first_name: Tatiana full_name: Moteu Ngoli, Tatiana id: '99174' last_name: Moteu Ngoli - first_name: Kshitij full_name: Shetty, Kshitij last_name: Shetty - first_name: Michael full_name: Röder, Michael id: '67199' last_name: Röder orcid: https://orcid.org/0000-0002-8609-8277 - first_name: Hamada Mohamed Abdelsamee full_name: Zahera, Hamada Mohamed Abdelsamee id: '72768' last_name: Zahera orcid: 0000-0003-0215-1278 - first_name: Diego full_name: Moussallem, Diego id: '71635' last_name: Moussallem - first_name: Axel-Cyrille full_name: Ngonga Ngomo, Axel-Cyrille id: '65716' last_name: Ngonga Ngomo citation: ama: 'Srivastava N, Kuchelev D, Moteu Ngoli T, et al. LOLA – An Open-Source Massively Multilingual Large Language Model. In: Rambow O, Wanner L, Apidianaki M, Al-Khalifa H, Eugenio BD, Schockaert S, eds. Proceedings of the 31st International Conference on Computational Linguistics. Association for Computational Linguistics; 2025:6420–6446.' apa: Srivastava, N., Kuchelev, D., Moteu Ngoli, T., Shetty, K., Röder, M., Zahera, H. M. A., Moussallem, D., & Ngonga Ngomo, A.-C. (2025). LOLA – An Open-Source Massively Multilingual Large Language Model. In O. Rambow, L. Wanner, M. Apidianaki, H. Al-Khalifa, B. D. Eugenio, & S. Schockaert (Eds.), Proceedings of the 31st International Conference on Computational Linguistics (pp. 6420–6446). Association for Computational Linguistics. bibtex: '@inproceedings{Srivastava_Kuchelev_Moteu Ngoli_Shetty_Röder_Zahera_Moussallem_Ngonga Ngomo_2025, place={Abu Dhabi, UAE}, title={LOLA – An Open-Source Massively Multilingual Large Language Model}, booktitle={Proceedings of the 31st International Conference on Computational Linguistics}, publisher={Association for Computational Linguistics}, author={Srivastava, Nikit and Kuchelev, Denis and Moteu Ngoli, Tatiana and Shetty, Kshitij and Röder, Michael and Zahera, Hamada Mohamed Abdelsamee and Moussallem, Diego and Ngonga Ngomo, Axel-Cyrille}, editor={Rambow, Owen and Wanner, Leo and Apidianaki, Marianna and Al-Khalifa, Hend and Eugenio, Barbara Di and Schockaert, Steven}, year={2025}, pages={6420–6446} }' chicago: 'Srivastava, Nikit, Denis Kuchelev, Tatiana Moteu Ngoli, Kshitij Shetty, Michael Röder, Hamada Mohamed Abdelsamee Zahera, Diego Moussallem, and Axel-Cyrille Ngonga Ngomo. “LOLA – An Open-Source Massively Multilingual Large Language Model.” In Proceedings of the 31st International Conference on Computational Linguistics, edited by Owen Rambow, Leo Wanner, Marianna Apidianaki, Hend Al-Khalifa, Barbara Di Eugenio, and Steven Schockaert, 6420–6446. Abu Dhabi, UAE: Association for Computational Linguistics, 2025.' ieee: N. Srivastava et al., “LOLA – An Open-Source Massively Multilingual Large Language Model,” in Proceedings of the 31st International Conference on Computational Linguistics, 2025, pp. 6420–6446. mla: Srivastava, Nikit, et al. “LOLA – An Open-Source Massively Multilingual Large Language Model.” Proceedings of the 31st International Conference on Computational Linguistics, edited by Owen Rambow et al., Association for Computational Linguistics, 2025, pp. 6420–6446. short: 'N. Srivastava, D. Kuchelev, T. Moteu Ngoli, K. Shetty, M. Röder, H.M.A. Zahera, D. Moussallem, A.-C. Ngonga Ngomo, in: O. Rambow, L. Wanner, M. Apidianaki, H. Al-Khalifa, B.D. Eugenio, S. Schockaert (Eds.), Proceedings of the 31st International Conference on Computational Linguistics, Association for Computational Linguistics, Abu Dhabi, UAE, 2025, pp. 6420–6446.' date_created: 2025-10-08T11:02:30Z date_updated: 2026-01-06T10:11:37Z editor: - first_name: Owen full_name: Rambow, Owen last_name: Rambow - first_name: Leo full_name: Wanner, Leo last_name: Wanner - first_name: Marianna full_name: Apidianaki, Marianna last_name: Apidianaki - first_name: Hend full_name: Al-Khalifa, Hend last_name: Al-Khalifa - first_name: Barbara Di full_name: Eugenio, Barbara Di last_name: Eugenio - first_name: Steven full_name: Schockaert, Steven last_name: Schockaert language: - iso: eng main_file_link: - open_access: '1' url: https://aclanthology.org/2025.coling-main.428.pdf oa: '1' page: 6420–6446 place: Abu Dhabi, UAE publication: Proceedings of the 31st International Conference on Computational Linguistics publisher: Association for Computational Linguistics status: public title: LOLA – An Open-Source Massively Multilingual Large Language Model type: conference user_id: '70066' year: '2025' ... --- _id: '63091' abstract: - lang: eng text: We present the design and characterization of a guided-wave, bright, and highly frequency non-degenerate parametric down-conversion (PDC) source in thin-film lithium niobate. The source generates photon pairs with wavelengths of 815 nm and 1550 nm, linking the visible wavelength regime with telecommunication wavelengths. We confirm the high quality of the generated single photons by determining a value for the heralded second-order correlation function as low as g_h^(2)=(6.7+/-1.1)*10^8-3). Furthermore, we achieve a high spectral brightness of 0.44·10pairs/(smWGHz) which is two orders of magnitude higher than sources based on weakly guiding waveguides. The shape of the PDC spectrum and the strong agreement between the effective and nominal bandwidth highlight our high fabrication quality of periodically poled waveguides. The good agreement between the measured and simulated spectral characteristics of our source demonstrates our excellent understanding of the PDC process. Our result is a valuable step towards practical and scalable quantum communication networks as well as photonic quantum computing. article_number: '52729' article_type: original author: - first_name: Silia full_name: Babel, Silia id: '63231' last_name: Babel orcid: https://orcid.org/0000-0002-1568-2580 - first_name: Laura full_name: Bollmers, Laura id: '61375' last_name: Bollmers - first_name: Franz full_name: Roeder, Franz id: '88149' last_name: Roeder - first_name: Werner full_name: Ridder, Werner id: '63574' last_name: Ridder - first_name: Christian full_name: Golla, Christian id: '40420' last_name: Golla - first_name: Ronja full_name: Köthemann, Ronja last_name: Köthemann - first_name: Bernhard full_name: Reineke, Bernhard id: '29821' last_name: Reineke - first_name: Harald full_name: Herrmann, Harald id: '216' last_name: Herrmann - first_name: Benjamin full_name: Brecht, Benjamin id: '27150' last_name: Brecht orcid: '0000-0003-4140-0556 ' - first_name: Christof full_name: Eigner, Christof id: '13244' last_name: Eigner orcid: https://orcid.org/0000-0002-5693-3083 - first_name: Laura full_name: Padberg, Laura id: '40300' last_name: Padberg - first_name: Christine full_name: Silberhorn, Christine id: '26263' last_name: Silberhorn citation: ama: Babel S, Bollmers L, Roeder F, et al. Ultrabright, two-color photon pair source based on thin-film lithium niobate for bridging visible and telecom wavelengths. Optics Express. 2025;33(25). doi:10.1364/oe.571605 apa: Babel, S., Bollmers, L., Roeder, F., Ridder, W., Golla, C., Köthemann, R., Reineke, B., Herrmann, H., Brecht, B., Eigner, C., Padberg, L., & Silberhorn, C. (2025). Ultrabright, two-color photon pair source based on thin-film lithium niobate for bridging visible and telecom wavelengths. Optics Express, 33(25), Article 52729. https://doi.org/10.1364/oe.571605 bibtex: '@article{Babel_Bollmers_Roeder_Ridder_Golla_Köthemann_Reineke_Herrmann_Brecht_Eigner_et al._2025, title={Ultrabright, two-color photon pair source based on thin-film lithium niobate for bridging visible and telecom wavelengths}, volume={33}, DOI={10.1364/oe.571605}, number={2552729}, journal={Optics Express}, publisher={Optica Publishing Group}, author={Babel, Silia and Bollmers, Laura and Roeder, Franz and Ridder, Werner and Golla, Christian and Köthemann, Ronja and Reineke, Bernhard and Herrmann, Harald and Brecht, Benjamin and Eigner, Christof and et al.}, year={2025} }' chicago: Babel, Silia, Laura Bollmers, Franz Roeder, Werner Ridder, Christian Golla, Ronja Köthemann, Bernhard Reineke, et al. “Ultrabright, Two-Color Photon Pair Source Based on Thin-Film Lithium Niobate for Bridging Visible and Telecom Wavelengths.” Optics Express 33, no. 25 (2025). https://doi.org/10.1364/oe.571605. ieee: 'S. Babel et al., “Ultrabright, two-color photon pair source based on thin-film lithium niobate for bridging visible and telecom wavelengths,” Optics Express, vol. 33, no. 25, Art. no. 52729, 2025, doi: 10.1364/oe.571605.' mla: Babel, Silia, et al. “Ultrabright, Two-Color Photon Pair Source Based on Thin-Film Lithium Niobate for Bridging Visible and Telecom Wavelengths.” Optics Express, vol. 33, no. 25, 52729, Optica Publishing Group, 2025, doi:10.1364/oe.571605. short: S. Babel, L. Bollmers, F. Roeder, W. Ridder, C. Golla, R. Köthemann, B. Reineke, H. Herrmann, B. Brecht, C. Eigner, L. Padberg, C. Silberhorn, Optics Express 33 (2025). date_created: 2025-12-15T07:20:36Z date_updated: 2026-01-07T11:28:35Z department: - _id: '288' - _id: '623' doi: 10.1364/oe.571605 intvolume: ' 33' issue: '25' language: - iso: eng main_file_link: - open_access: '1' url: https://opg.optica.org/oe/fulltext.cfm?uri=oe-33-25-52729 oa: '1' publication: Optics Express publication_identifier: issn: - 1094-4087 publication_status: published publisher: Optica Publishing Group status: public title: Ultrabright, two-color photon pair source based on thin-film lithium niobate for bridging visible and telecom wavelengths type: journal_article user_id: '63231' volume: 33 year: '2025' ... --- _id: '62713' abstract: - lang: eng text: Periodically poled thin-film lithium niobate (TFLN) crystals are the fundamental building block for highly-efficient quantum light sources and frequency converters. The efficiency of these devices is strongly dependent on the interaction length between the light and the nonlinear material, scaling quadratically with this parameter. Nevertheless, the fabrication of long, continuously poled areas in TFLN remains challenging, the length of continuously poled areas rarely exceeds 10 mm. In this work, we demonstrate a significant progress in this field achieving the periodic poling of continuous poled areas of 70 mm length with a 3 μm poling period and a close to 50 % duty cycle. We compare two poling electrode design approaches to fabricate long, continuous poled areas. The first approach involves the poling of a single, continuous 70 mm long electrode. The second utilize a segmented approach including the poling of more than 20 individual sections forming together a 70 mm long poling area with no stitching errors. While the continuous electrode allows for faster fabrication, the segmented approach allows to individually optimize the poling resulting in less duty cycle variation. A detailed analysis of the periodic poling results reveals that the results of both are consistent with previously reported poling outcomes for shorter devices. Thus, we demonstrate wafer-scale periodic poling exceeding chiplet-size without any loss in the periodic poling quality. Our work presents a key step towards highly-efficient, narrow-bandwidth and low-pump power nonlinear optical devices. article_type: original author: - first_name: Laura full_name: Bollmers, Laura id: '61375' last_name: Bollmers - first_name: Noah full_name: Spiegelberg, Noah last_name: Spiegelberg - first_name: Michael full_name: Rüsing, Michael id: '22501' last_name: Rüsing orcid: 0000-0003-4682-4577 - first_name: Christof full_name: Eigner, Christof id: '13244' last_name: Eigner orcid: https://orcid.org/0000-0002-5693-3083 - first_name: Laura full_name: Padberg, Laura id: '40300' last_name: Padberg - first_name: Christine full_name: Silberhorn, Christine id: '26263' last_name: Silberhorn citation: ama: Bollmers L, Spiegelberg N, Rüsing M, Eigner C, Padberg L, Silberhorn C. Segmented finger electrodes to optimize ultra-long continuous wafer-scale periodic poling in thin-film lithium niobate. Nanophotonics. 2025;14:4761. doi:10.1515/nanoph-2025-0461 apa: Bollmers, L., Spiegelberg, N., Rüsing, M., Eigner, C., Padberg, L., & Silberhorn, C. (2025). Segmented finger electrodes to optimize ultra-long continuous wafer-scale periodic poling in thin-film lithium niobate. Nanophotonics, 14, 4761. https://doi.org/10.1515/nanoph-2025-0461 bibtex: '@article{Bollmers_Spiegelberg_Rüsing_Eigner_Padberg_Silberhorn_2025, title={Segmented finger electrodes to optimize ultra-long continuous wafer-scale periodic poling in thin-film lithium niobate}, volume={14}, DOI={10.1515/nanoph-2025-0461}, journal={Nanophotonics}, publisher={Walter de Gruyter GmbH}, author={Bollmers, Laura and Spiegelberg, Noah and Rüsing, Michael and Eigner, Christof and Padberg, Laura and Silberhorn, Christine}, year={2025}, pages={4761} }' chicago: 'Bollmers, Laura, Noah Spiegelberg, Michael Rüsing, Christof Eigner, Laura Padberg, and Christine Silberhorn. “Segmented Finger Electrodes to Optimize Ultra-Long Continuous Wafer-Scale Periodic Poling in Thin-Film Lithium Niobate.” Nanophotonics 14 (2025): 4761. https://doi.org/10.1515/nanoph-2025-0461.' ieee: 'L. Bollmers, N. Spiegelberg, M. Rüsing, C. Eigner, L. Padberg, and C. Silberhorn, “Segmented finger electrodes to optimize ultra-long continuous wafer-scale periodic poling in thin-film lithium niobate,” Nanophotonics, vol. 14, p. 4761, 2025, doi: 10.1515/nanoph-2025-0461.' mla: Bollmers, Laura, et al. “Segmented Finger Electrodes to Optimize Ultra-Long Continuous Wafer-Scale Periodic Poling in Thin-Film Lithium Niobate.” Nanophotonics, vol. 14, Walter de Gruyter GmbH, 2025, p. 4761, doi:10.1515/nanoph-2025-0461. short: L. Bollmers, N. Spiegelberg, M. Rüsing, C. Eigner, L. Padberg, C. Silberhorn, Nanophotonics 14 (2025) 4761. date_created: 2025-12-01T08:45:07Z date_updated: 2026-01-07T12:06:29Z department: - _id: '15' - _id: '288' - _id: '623' doi: 10.1515/nanoph-2025-0461 intvolume: ' 14' language: - iso: eng main_file_link: - open_access: '1' url: https://doi.org/10.1515/nanoph-2025-0461 oa: '1' page: '4761' publication: Nanophotonics publication_identifier: issn: - 2192-8606 - 2192-8614 publication_status: published publisher: Walter de Gruyter GmbH quality_controlled: '1' status: public title: Segmented finger electrodes to optimize ultra-long continuous wafer-scale periodic poling in thin-film lithium niobate type: journal_article user_id: '22501' volume: 14 year: '2025' ... --- _id: '63524' abstract: - lang: eng text: Recommendation systems are essential for delivering personalized content across e-commerce and streaming services. However, traditional methods often fail in cold-start scenarios where new items lack prior interactions. Recent advances in large language models (LLMs) offer a promising alternative. In this paper, we adopt the retrieve-and-recommend framework and propose to fine-tune the LLM jointly on warm-and cold-start next-item recommendation tasks, thus, mitigating the need for separate models for both item types. We computationally compare zero-shot prompting, in-context learning, and fine-tuning using the same LLM backbone, and benchmark them against strong PLM-based baselines. Our findings provide practical insights into the trade-offs between accuracy and computational cost of these methods for next-item recommendation. To enhance reproducibility, we release the source code under https://github. com/HayaHalimeh/LLMs-For-Next-Item-Recommendation.git. author: - first_name: Haya full_name: Halimeh, Haya id: '87673' last_name: Halimeh - first_name: Florian full_name: Freese, Florian last_name: Freese - first_name: Oliver full_name: Müller, Oliver last_name: Müller citation: ama: 'Halimeh H, Freese F, Müller O. LLMs For Warm and Cold Next-Item Recommendation: A Comparative Study across Zero-Shot Prompting, In-Context Learning and Fine-Tuning. In: International Conference on Information Systems Development. University of Gdansk, Department of Business Informatics & University of Belgrade, Faculty of Organizational Sciences; 2025. doi:10.62036/isd.2025.68' apa: 'Halimeh, H., Freese, F., & Müller, O. (2025). LLMs For Warm and Cold Next-Item Recommendation: A Comparative Study across Zero-Shot Prompting, In-Context Learning and Fine-Tuning. International Conference on Information Systems Development. https://doi.org/10.62036/isd.2025.68' bibtex: '@inproceedings{Halimeh_Freese_Müller_2025, title={LLMs For Warm and Cold Next-Item Recommendation: A Comparative Study across Zero-Shot Prompting, In-Context Learning and Fine-Tuning}, DOI={10.62036/isd.2025.68}, booktitle={International Conference on Information Systems Development}, publisher={University of Gdansk, Department of Business Informatics & University of Belgrade, Faculty of Organizational Sciences}, author={Halimeh, Haya and Freese, Florian and Müller, Oliver}, year={2025} }' chicago: 'Halimeh, Haya, Florian Freese, and Oliver Müller. “LLMs For Warm and Cold Next-Item Recommendation: A Comparative Study across Zero-Shot Prompting, In-Context Learning and Fine-Tuning.” In International Conference on Information Systems Development. University of Gdansk, Department of Business Informatics & University of Belgrade, Faculty of Organizational Sciences, 2025. https://doi.org/10.62036/isd.2025.68.' ieee: 'H. Halimeh, F. Freese, and O. Müller, “LLMs For Warm and Cold Next-Item Recommendation: A Comparative Study across Zero-Shot Prompting, In-Context Learning and Fine-Tuning,” 2025, doi: 10.62036/isd.2025.68.' mla: 'Halimeh, Haya, et al. “LLMs For Warm and Cold Next-Item Recommendation: A Comparative Study across Zero-Shot Prompting, In-Context Learning and Fine-Tuning.” International Conference on Information Systems Development, University of Gdansk, Department of Business Informatics & University of Belgrade, Faculty of Organizational Sciences, 2025, doi:10.62036/isd.2025.68.' short: 'H. Halimeh, F. Freese, O. Müller, in: International Conference on Information Systems Development, University of Gdansk, Department of Business Informatics & University of Belgrade, Faculty of Organizational Sciences, 2025.' date_created: 2026-01-07T13:36:53Z date_updated: 2026-01-07T13:47:43Z department: - _id: '195' - _id: '196' doi: 10.62036/isd.2025.68 language: - iso: eng main_file_link: - open_access: '1' oa: '1' publication: International Conference on Information Systems Development publication_identifier: issn: - 2938-5202 publication_status: published publisher: University of Gdansk, Department of Business Informatics & University of Belgrade, Faculty of Organizational Sciences status: public title: 'LLMs For Warm and Cold Next-Item Recommendation: A Comparative Study across Zero-Shot Prompting, In-Context Learning and Fine-Tuning' type: conference user_id: '87673' year: '2025' ... --- _id: '63523' abstract: - lang: eng text: 'Data spaces have become a strategic pillar of Europe''s digital agenda, enabling sovereign, legally compliant data sharing within decentralized ecosystems. As data space initiatives evolve, personalized recommendations are increasingly recognized as key use cases. However, traditional recommendation approaches typically rely on centralized aggregation of user behavior data-directly conflicting with the core ethos of data spaces: sovereignty, privacy, and trust. Federated recommendation systems offer a promising alternative by training models locally and exchanging only intermediate parameters to build a global model. Despite this potential, the integration of federated recommendation techniques and data space architectures remains largely underexplored in research and practice. This paper addresses this gap by designing and evaluating a prototype of a federated recommendation system specifically tailored for data spaces and compliant with their underlying infrastructure. Our findings highlight the viability of developing privacy-preserving, collaborative recommendation systems within data spaces, and contribute to the broader adoption of AI across these emerging ecosystems.' author: - first_name: Haya full_name: Halimeh, Haya id: '87673' last_name: Halimeh - first_name: Philipp full_name: zur Heiden, Philipp id: '64394' last_name: zur Heiden citation: ama: 'Halimeh H, zur Heiden P. Preserving Sovereignty and Privacy for Personalization: Designing a Federated Recommendation System for Data Spaces. In: 2025 27th International Conference on Business Informatics (CBI). IEEE; 2025. doi:10.1109/cbi68102.2025.00019' apa: 'Halimeh, H., & zur Heiden, P. (2025). Preserving Sovereignty and Privacy for Personalization: Designing a Federated Recommendation System for Data Spaces. 2025 27th International Conference on Business Informatics (CBI). https://doi.org/10.1109/cbi68102.2025.00019' bibtex: '@inproceedings{Halimeh_zur Heiden_2025, title={Preserving Sovereignty and Privacy for Personalization: Designing a Federated Recommendation System for Data Spaces}, DOI={10.1109/cbi68102.2025.00019}, booktitle={2025 27th International Conference on Business Informatics (CBI)}, publisher={IEEE}, author={Halimeh, Haya and zur Heiden, Philipp}, year={2025} }' chicago: 'Halimeh, Haya, and Philipp zur Heiden. “Preserving Sovereignty and Privacy for Personalization: Designing a Federated Recommendation System for Data Spaces.” In 2025 27th International Conference on Business Informatics (CBI). IEEE, 2025. https://doi.org/10.1109/cbi68102.2025.00019.' ieee: 'H. Halimeh and P. zur Heiden, “Preserving Sovereignty and Privacy for Personalization: Designing a Federated Recommendation System for Data Spaces,” 2025, doi: 10.1109/cbi68102.2025.00019.' mla: 'Halimeh, Haya, and Philipp zur Heiden. “Preserving Sovereignty and Privacy for Personalization: Designing a Federated Recommendation System for Data Spaces.” 2025 27th International Conference on Business Informatics (CBI), IEEE, 2025, doi:10.1109/cbi68102.2025.00019.' short: 'H. Halimeh, P. zur Heiden, in: 2025 27th International Conference on Business Informatics (CBI), IEEE, 2025.' date_created: 2026-01-07T13:34:02Z date_updated: 2026-01-07T13:49:45Z department: - _id: '195' - _id: '196' doi: 10.1109/cbi68102.2025.00019 language: - iso: eng main_file_link: - open_access: '1' oa: '1' publication: 2025 27th International Conference on Business Informatics (CBI) publication_status: published publisher: IEEE status: public title: 'Preserving Sovereignty and Privacy for Personalization: Designing a Federated Recommendation System for Data Spaces' type: conference user_id: '87673' year: '2025' ...