[{"doi":"https://doi.org/10.1016/j.ymssp.2026.113904","main_file_link":[{"open_access":"1","url":"https://www.sciencedirect.com/science/article/pii/S0888327026000610/pdfft?md5=16e8493b44527f4ab0a6d13f634a01c3&pid=1-s2.0-S0888327026000610-main.pdf"}],"language":[{"iso":"eng"}],"date_updated":"2026-02-02T12:44:47Z","publication_status":"published","intvolume":" 247","year":"2026","title":"A modified Levenberg–Marquardt method for estimating the elastic material parameters of polymer waveguides using residuals between autocorrelated frequency responses","author":[{"last_name":"Itner","first_name":"Dominik","full_name":"Itner, Dominik"},{"last_name":"Dreiling","first_name":"Dmitrij","full_name":"Dreiling, Dmitrij","id":"32616"},{"full_name":"Gravenkamp, Hauke","last_name":"Gravenkamp","first_name":"Hauke"},{"full_name":"Henning, Bernd","last_name":"Henning","first_name":"Bernd","id":"213"},{"full_name":"Birk, Carolin","first_name":"Carolin","last_name":"Birk"}],"publication_identifier":{"issn":["0888-3270"]},"type":"journal_article","keyword":["Material parameter estimation","Waveguide","Nonlinear optimization","Inverse problem","Least squares"],"department":[{"_id":"49"}],"date_created":"2026-01-29T08:53:42Z","abstract":[{"lang":"eng","text":"In this contribution, we address the estimation of the frequency-dependent elastic parameters of polymers in the ultrasound range, which is formulated as an inverse problem. This inverse problem is implemented as a nonlinear regression-type optimization problem, in which the simulation signals are fitted to the measurement signals. These signals consist of displacement responses in waveguides, focusing on hollow cylindrical geometries to enhance the simulation efficiency. To accelerate the optimization and reduce the number of model evaluations and wait times, we propose two novel methods. First, we introduce an adaptation of the Levenberg–Marquardt method derived from a geometrical interpretation of the least-squares optimization problem. Second, we introduce an improved objective function based on the autocorrelated envelopes of the measurement and simulation signals. Given that this study primarily relies on simulation data to quantify optimization convergence, we aggregate the expected ranges of realistic material parameters and derive their distributions to ensure the reproducibility of optimizations with proper measurements. We demonstrate the effectiveness of our objective function modification and step adaptation for various materials with isotropic material symmetry by comparing them with the Broyden–Fletcher–Goldfarb–Shanno method. In all cases, our method reduces the total number of model evaluations, thereby shortening the time to identify the material parameters."}],"publication":"Mechanical Systems and Signal Processing","user_id":"32616","volume":247,"page":"113904","_id":"63800","status":"public","oa":"1","project":[{"name":"Vollständige Bestimmung der akustischen Materialparameter von Polymeren","_id":"89"}],"citation":{"apa":"Itner, D., Dreiling, D., Gravenkamp, H., Henning, B., & Birk, C. (2026). A modified Levenberg–Marquardt method for estimating the elastic material parameters of polymer waveguides using residuals between autocorrelated frequency responses. Mechanical Systems and Signal Processing, 247, 113904. https://doi.org/10.1016/j.ymssp.2026.113904","ieee":"D. Itner, D. Dreiling, H. Gravenkamp, B. Henning, and C. Birk, “A modified Levenberg–Marquardt method for estimating the elastic material parameters of polymer waveguides using residuals between autocorrelated frequency responses,” Mechanical Systems and Signal Processing, vol. 247, p. 113904, 2026, doi: https://doi.org/10.1016/j.ymssp.2026.113904.","chicago":"Itner, Dominik, Dmitrij Dreiling, Hauke Gravenkamp, Bernd Henning, and Carolin Birk. “A Modified Levenberg–Marquardt Method for Estimating the Elastic Material Parameters of Polymer Waveguides Using Residuals between Autocorrelated Frequency Responses.” Mechanical Systems and Signal Processing 247 (2026): 113904. https://doi.org/10.1016/j.ymssp.2026.113904.","short":"D. Itner, D. Dreiling, H. Gravenkamp, B. Henning, C. Birk, Mechanical Systems and Signal Processing 247 (2026) 113904.","mla":"Itner, Dominik, et al. “A Modified Levenberg–Marquardt Method for Estimating the Elastic Material Parameters of Polymer Waveguides Using Residuals between Autocorrelated Frequency Responses.” Mechanical Systems and Signal Processing, vol. 247, 2026, p. 113904, doi:https://doi.org/10.1016/j.ymssp.2026.113904.","ama":"Itner D, Dreiling D, Gravenkamp H, Henning B, Birk C. A modified Levenberg–Marquardt method for estimating the elastic material parameters of polymer waveguides using residuals between autocorrelated frequency responses. Mechanical Systems and Signal Processing. 2026;247:113904. doi:https://doi.org/10.1016/j.ymssp.2026.113904","bibtex":"@article{Itner_Dreiling_Gravenkamp_Henning_Birk_2026, title={A modified Levenberg–Marquardt method for estimating the elastic material parameters of polymer waveguides using residuals between autocorrelated frequency responses}, volume={247}, DOI={https://doi.org/10.1016/j.ymssp.2026.113904}, journal={Mechanical Systems and Signal Processing}, author={Itner, Dominik and Dreiling, Dmitrij and Gravenkamp, Hauke and Henning, Bernd and Birk, Carolin}, year={2026}, pages={113904} }"}},{"doi":"https://doi.org/10.1016/j.jmapro.2026.02.040","language":[{"iso":"eng"}],"date_updated":"2026-02-26T11:22:03Z","publication_status":"published","intvolume":" 164","article_type":"original","year":"2026","title":"Solidification-joinability correlation of hypoeutectic aluminium casting alloys for self-piercing riveting (SPR)","author":[{"last_name":"Neuser","first_name":"Moritz","full_name":"Neuser, Moritz","id":"32340"},{"id":"44935","full_name":"Kaimann, Pia Katharina","last_name":"Kaimann","first_name":"Pia Katharina"},{"full_name":"Stratmann, Ina","first_name":"Ina","last_name":"Stratmann"},{"id":"7850","last_name":"Bobbert","first_name":"Mathias","full_name":"Bobbert, Mathias"},{"last_name":"Klöckner","first_name":"Johann Moritz Benedikt","full_name":"Klöckner, Johann Moritz Benedikt"},{"first_name":"Moritz","last_name":"Mann","full_name":"Mann, Moritz"},{"id":"48411","last_name":"Hoyer","first_name":"Kay-Peter","full_name":"Hoyer, Kay-Peter"},{"first_name":"Gerson","orcid":"0000-0002-2763-1246","last_name":"Meschut","full_name":"Meschut, Gerson","id":"32056"},{"id":"43720","full_name":"Schaper, Mirko","first_name":"Mirko","last_name":"Schaper"}],"type":"journal_article","keyword":["Mechanical joining","Aluminium","Self-piercing riveting","Casting","Microstructure","Joinability AlSi-alloys"],"department":[{"_id":"43"},{"_id":"158"},{"_id":"157"},{"_id":"321"}],"date_created":"2026-02-26T11:21:24Z","abstract":[{"lang":"eng","text":"One of the major topics in the modern automotive industry is reducing emissions and increasing the mileage\r\nrange. To tackle this challenge, on the one hand, modifying the powertrain system is a possibility, and on the\r\nother hand, lightweight design offers various possibilities. Multi-Material Design (MMD) involves designing car\r\nbodies that combine different materials that require joining. Given the variety of materials, mechanical joining\r\nprocesses are preferred. Especially the current development of the Giga/Mega-casting process concerning\r\naluminium casting and the subsequent mechanical joining illustrates the challenges of this material group. In car\r\nproduction, aluminium castings are mainly made from aluminium-silicon (AlSi) alloys. Ultimately, the alloy\r\nsystem's insufficient ductility leads to crack initiation during mechanical joining. Cast parts are therefore often\r\nused in areas of the car body that are exposed to high-pressure loads. For example, self-piercing riveting (SPR) is\r\nused due to its high load-bearing capacity. In this study, improved joinability is demonstrated by influencing the\r\nmicrostructure through tailored solidification rates and a developed heat-treatment chain strategy adapted for\r\nhypoeutectic AlSi systems. Data on microstructure, mechanical, and joining properties are used to develop a\r\nsolidification-joining correlation for the SPR process across a range of Si contents and solidification rates. The\r\npurpose is to develop the ability to produce suitable aluminium castings with sufficient joinability, thereby\r\nimproving versatility."}],"publication":"Journal of Manufacturing Processes","user_id":"32340","volume":164,"funded_apc":"1","_id":"64678","publisher":"Elsevier","status":"public","quality_controlled":"1","project":[{"_id":"131","name":"TRR 285 - Project Area A"},{"_id":"133","name":"TRR 285 - Project Area C"},{"_id":"136","name":"TRR 285 - Subproject A02"},{"name":"TRR 285 - Subproject C02","_id":"146"},{"_id":"130","name":"TRR 285: Methodenentwicklung zur mechanischen Fügbarkeit in wandlungsfähigen Prozessketten"}],"citation":{"mla":"Neuser, Moritz, et al. “Solidification-Joinability Correlation of Hypoeutectic Aluminium Casting Alloys for Self-Piercing Riveting (SPR).” Journal of Manufacturing Processes, vol. 164, Elsevier, 2026, doi:https://doi.org/10.1016/j.jmapro.2026.02.040.","apa":"Neuser, M., Kaimann, P. K., Stratmann, I., Bobbert, M., Klöckner, J. M. B., Mann, M., Hoyer, K.-P., Meschut, G., & Schaper, M. (2026). Solidification-joinability correlation of hypoeutectic aluminium casting alloys for self-piercing riveting (SPR). Journal of Manufacturing Processes, 164. https://doi.org/10.1016/j.jmapro.2026.02.040","ieee":"M. Neuser et al., “Solidification-joinability correlation of hypoeutectic aluminium casting alloys for self-piercing riveting (SPR),” Journal of Manufacturing Processes, vol. 164, 2026, doi: https://doi.org/10.1016/j.jmapro.2026.02.040.","chicago":"Neuser, Moritz, Pia Katharina Kaimann, Ina Stratmann, Mathias Bobbert, Johann Moritz Benedikt Klöckner, Moritz Mann, Kay-Peter Hoyer, Gerson Meschut, and Mirko Schaper. “Solidification-Joinability Correlation of Hypoeutectic Aluminium Casting Alloys for Self-Piercing Riveting (SPR).” Journal of Manufacturing Processes 164 (2026). https://doi.org/10.1016/j.jmapro.2026.02.040.","short":"M. Neuser, P.K. Kaimann, I. Stratmann, M. Bobbert, J.M.B. Klöckner, M. Mann, K.-P. Hoyer, G. Meschut, M. Schaper, Journal of Manufacturing Processes 164 (2026).","ama":"Neuser M, Kaimann PK, Stratmann I, et al. Solidification-joinability correlation of hypoeutectic aluminium casting alloys for self-piercing riveting (SPR). Journal of Manufacturing Processes. 2026;164. doi:https://doi.org/10.1016/j.jmapro.2026.02.040","bibtex":"@article{Neuser_Kaimann_Stratmann_Bobbert_Klöckner_Mann_Hoyer_Meschut_Schaper_2026, title={Solidification-joinability correlation of hypoeutectic aluminium casting alloys for self-piercing riveting (SPR)}, volume={164}, DOI={https://doi.org/10.1016/j.jmapro.2026.02.040}, journal={Journal of Manufacturing Processes}, publisher={Elsevier}, author={Neuser, Moritz and Kaimann, Pia Katharina and Stratmann, Ina and Bobbert, Mathias and Klöckner, Johann Moritz Benedikt and Mann, Moritz and Hoyer, Kay-Peter and Meschut, Gerson and Schaper, Mirko}, year={2026} }"}},{"date_updated":"2026-03-16T12:38:13Z","publication_status":"published","intvolume":" 13","year":"2026","title":"Numerical analysis of the robustness of self-pierce riveting with pre-formed joining partners","publication_identifier":{"issn":["2666-3309"]},"author":[{"last_name":"Ludwig","first_name":"Jean-Patrick","full_name":"Ludwig, Jean-Patrick","id":"76631"},{"last_name":"Tolke","first_name":"Emil","full_name":"Tolke, Emil"},{"id":"61977","last_name":"Schlichter","first_name":"Malte Christian","full_name":"Schlichter, Malte Christian"},{"last_name":"Bobbert","first_name":"Mathias","full_name":"Bobbert, Mathias","id":"7850"},{"id":"32056","first_name":"Gerson","orcid":"0000-0002-2763-1246","last_name":"Meschut","full_name":"Meschut, Gerson"}],"doi":"10.1016/j.jajp.2026.100391","article_number":"100391","language":[{"iso":"eng"}],"abstract":[{"text":"Modern industrial development has necessitated a wide range of joining technologies. Self-pierce riveting has become a prevalent technique for sheet metal assembly, especially in automotive applications. Achieving proper joint geometry and adequate load-bearing capacity depends on appropriate tool selection and precise process control. Material properties and condition also play a significant role in process performance. To accommodate the inevitable variations in component characteristics during production, a robust and stable joining process is essential. The study focuses on investigating the influence of preformed joining partners on the joining process and the joint's load capacity. An EN AW-6014 in T4 condition, as well as an HCT590X, are used as materials for this study. For this purpose, an exemplary process chain consisting of the steps of performing, joining, and shear load testing is studied. Each process step is implemented using an FE model to predict the outcome of subsequent steps. For analysis of the influence of pre-strain, an optimisation software is used to plan and execute variations of the process. These variations are used to create a meta-model that can describe the relationships between pre-forming and characteristic parameters of subsequent process steps. The resulting model is validated by comparing simulation and experimental data. Finally, in a novel approach, the robustness of the presented process chain is analyzed in terms of a tolerable performance level for the joining partners.","lang":"eng"}],"publication":"Journal of Advanced Joining Processes","keyword":["Self-pierce riveting","FE modelling","Plastic pre-deformation","Meta modelling"],"type":"journal_article","department":[{"_id":"9"}],"date_created":"2026-03-16T12:30:39Z","status":"public","user_id":"76631","volume":13,"publisher":"Elsevier BV","_id":"64985","quality_controlled":"1","project":[{"_id":"131","name":"TRR 285 - Project Area A"},{"name":"TRR 285 - Subproject A01","_id":"135"},{"_id":"130","name":"TRR 285: Methodenentwicklung zur mechanischen Fügbarkeit in wandlungsfähigen Prozessketten"}],"citation":{"chicago":"Ludwig, Jean-Patrick, Emil Tolke, Malte Christian Schlichter, Mathias Bobbert, and Gerson Meschut. “Numerical Analysis of the Robustness of Self-Pierce Riveting with Pre-Formed Joining Partners.” Journal of Advanced Joining Processes 13 (2026). https://doi.org/10.1016/j.jajp.2026.100391.","short":"J.-P. Ludwig, E. Tolke, M.C. Schlichter, M. Bobbert, G. Meschut, Journal of Advanced Joining Processes 13 (2026).","apa":"Ludwig, J.-P., Tolke, E., Schlichter, M. C., Bobbert, M., & Meschut, G. (2026). Numerical analysis of the robustness of self-pierce riveting with pre-formed joining partners. Journal of Advanced Joining Processes, 13, Article 100391. https://doi.org/10.1016/j.jajp.2026.100391","ieee":"J.-P. Ludwig, E. Tolke, M. C. Schlichter, M. Bobbert, and G. Meschut, “Numerical analysis of the robustness of self-pierce riveting with pre-formed joining partners,” Journal of Advanced Joining Processes, vol. 13, Art. no. 100391, 2026, doi: 10.1016/j.jajp.2026.100391.","ama":"Ludwig J-P, Tolke E, Schlichter MC, Bobbert M, Meschut G. Numerical analysis of the robustness of self-pierce riveting with pre-formed joining partners. Journal of Advanced Joining Processes. 2026;13. doi:10.1016/j.jajp.2026.100391","bibtex":"@article{Ludwig_Tolke_Schlichter_Bobbert_Meschut_2026, title={Numerical analysis of the robustness of self-pierce riveting with pre-formed joining partners}, volume={13}, DOI={10.1016/j.jajp.2026.100391}, number={100391}, journal={Journal of Advanced Joining Processes}, publisher={Elsevier BV}, author={Ludwig, Jean-Patrick and Tolke, Emil and Schlichter, Malte Christian and Bobbert, Mathias and Meschut, Gerson}, year={2026} }","mla":"Ludwig, Jean-Patrick, et al. “Numerical Analysis of the Robustness of Self-Pierce Riveting with Pre-Formed Joining Partners.” Journal of Advanced Joining Processes, vol. 13, 100391, Elsevier BV, 2026, doi:10.1016/j.jajp.2026.100391."}},{"user_id":"94","volume":9,"_id":"65659","publisher":"Elsevier BV","status":"public","citation":{"apa":"Kramer, M., Horky, C., Völlmecke, K., Mulac-Hahnen, D., Herrmann, F., Kuckling, D., & Langer, K. (2026). Smart drug delivery systems for potential targeted cancer therapy: Exploiting increased glutathione levels in tumor microenvironments. Next Nanotechnology, 9, Article 100510. https://doi.org/10.1016/j.nxnano.2026.100510","ieee":"M. Kramer et al., “Smart drug delivery systems for potential targeted cancer therapy: Exploiting increased glutathione levels in tumor microenvironments,” Next Nanotechnology, vol. 9, Art. no. 100510, 2026, doi: 10.1016/j.nxnano.2026.100510.","short":"M. Kramer, C. Horky, K. Völlmecke, D. Mulac-Hahnen, F. Herrmann, D. Kuckling, K. Langer, Next Nanotechnology 9 (2026).","chicago":"Kramer, Maurice, Corinna Horky, Katharina Völlmecke, Dennis Mulac-Hahnen, Fabian Herrmann, Dirk Kuckling, and Klaus Langer. “Smart Drug Delivery Systems for Potential Targeted Cancer Therapy: Exploiting Increased Glutathione Levels in Tumor Microenvironments.” Next Nanotechnology 9 (2026). https://doi.org/10.1016/j.nxnano.2026.100510.","mla":"Kramer, Maurice, et al. “Smart Drug Delivery Systems for Potential Targeted Cancer Therapy: Exploiting Increased Glutathione Levels in Tumor Microenvironments.” Next Nanotechnology, vol. 9, 100510, Elsevier BV, 2026, doi:10.1016/j.nxnano.2026.100510.","ama":"Kramer M, Horky C, Völlmecke K, et al. Smart drug delivery systems for potential targeted cancer therapy: Exploiting increased glutathione levels in tumor microenvironments. Next Nanotechnology. 2026;9. doi:10.1016/j.nxnano.2026.100510","bibtex":"@article{Kramer_Horky_Völlmecke_Mulac-Hahnen_Herrmann_Kuckling_Langer_2026, title={Smart drug delivery systems for potential targeted cancer therapy: Exploiting increased glutathione levels in tumor microenvironments}, volume={9}, DOI={10.1016/j.nxnano.2026.100510}, number={100510}, journal={Next Nanotechnology}, publisher={Elsevier BV}, author={Kramer, Maurice and Horky, Corinna and Völlmecke, Katharina and Mulac-Hahnen, Dennis and Herrmann, Fabian and Kuckling, Dirk and Langer, Klaus}, year={2026} }"},"doi":"10.1016/j.nxnano.2026.100510","article_number":"100510","main_file_link":[{"url":"https://www.sciencedirect.com/science/article/pii/S294982952600149X?via%3Dihub"}],"language":[{"iso":"eng"}],"publication_status":"published","date_updated":"2026-05-20T08:41:56Z","article_type":"original","intvolume":" 9","title":"Smart drug delivery systems for potential targeted cancer therapy: Exploiting increased glutathione levels in tumor microenvironments","year":"2026","author":[{"full_name":"Kramer, Maurice","last_name":"Kramer","first_name":"Maurice"},{"full_name":"Horky, Corinna","last_name":"Horky","first_name":"Corinna"},{"last_name":"Völlmecke","first_name":"Katharina","full_name":"Völlmecke, Katharina"},{"full_name":"Mulac-Hahnen, Dennis","first_name":"Dennis","last_name":"Mulac-Hahnen"},{"first_name":"Fabian","last_name":"Herrmann","full_name":"Herrmann, Fabian"},{"first_name":"Dirk","last_name":"Kuckling","full_name":"Kuckling, Dirk","id":"287"},{"full_name":"Langer, Klaus","last_name":"Langer","first_name":"Klaus"}],"publication_identifier":{"issn":["2949-8295"]},"keyword":["Nanoparticles","Smart drug delivery","Controlled release","Self-immolative polymers","Tumor targeting"],"type":"journal_article","department":[{"_id":"163"}],"date_created":"2026-05-20T08:37:30Z","abstract":[{"lang":"eng","text":"Over the past decades, nanoparticulate drug carrier systems have emerged as promising tools in medicine. A persistent challenge in current pharmacotherapy is the limited selectivity of active pharmaceutical ingredients, resulting in undesirable side effects. Smart drug delivery systems, which release encapsulated active pharmaceutical ingredients in response to specific stimuli, offer a potential solution by enabling controlled drug release. This approach can be particularly relevant for exploiting biochemical differences between extracellular and intracellular environments. In this study, self-immolative polydisulfide based polymers manufactured from dithiothreitol were processed into nanoparticle formulations to respond preferentially to elevated glutathione levels, which are characteristic of intracellular environments and are often increased in tumor cells. The influence of polymer chain length on the physicochemical properties of the resulting nanoparticles was investigated. Lumogen® Red was incorporated as a model substance to determine the loading capacity of the carrier system. Degradation was characterized using dynamic light scattering and asymmetric flow field-flow fractionation, as well as by imaging techniques such as atomic force microscopy. Selective release of the embedded substance was demonstrated at elevated glutathione concentrations, while no significant release was observed at extracellularly relevant levels (10 µM glutathione), where the behavior was comparable to the buffer control. Increased release was observed under intracellularly relevant conditions (2 – 10 mM glutathione). These findings support a redox-responsive behavior under intracellular-like conditions. The latter was proven for primary fibroblasts and the cancer cell lines BT-474, MCF-7 and SK-BR-3 by quantification of intracellular low molecular weight thiols. The nanoparticle uptake was confirmed in the investigated cell lines by visualization via confocal laser scanning microscopy. Via lysosomal staining it was shown that nanoparticles accumulate in lysosomes. Furthermore, the carrier system itself showed no cytotoxic properties in cell culture studies against the four different cell types. The developed system is a suitable and very promising smart drug delivery system in the context of controlled drug release."}],"publication":"Next Nanotechnology"},{"year":"2026","title":"Particle-Reinforced Aluminium Solid Self-piercing Rivets for Joining Aluminium Alloy Sheets","author":[{"full_name":"Koch, Steffen","last_name":"Koch","first_name":"Steffen"},{"full_name":"Weber, Joshua","last_name":"Weber","first_name":"Joshua"},{"full_name":"Meschut, Gerson","first_name":"Gerson","last_name":"Meschut"},{"first_name":"Claudia","last_name":"Stadelmann","full_name":"Stadelmann, Claudia"},{"last_name":"Böhm","first_name":"Wolfgang","full_name":"Böhm, Wolfgang"},{"full_name":"Merklein, Marion","last_name":"Merklein","first_name":"Marion"}],"publication_identifier":{"issn":["2731-0221","2731-023X"],"isbn":["9783032236401","9783032236418"]},"publication_status":"published","date_updated":"2026-06-16T13:21:39Z","language":[{"iso":"eng"}],"doi":"10.1007/978-3-032-23641-8_1","publication":"Proceedings in Engineering Mechanics","abstract":[{"text":"The use of aluminium materials in the structural and bodywork areas of assemblies has proven to be a targeted option for lightweight design. How-ever, the reliable and cost-efficient joining of aluminium components remains a challenge. Mechanical joining methods, such as riveting, are frequently used in the automotive and aerospace construction industries. Rivets are made from heat-treated steels. Compared to steel, the use of aluminium materials for fasten-ers offers several advantages in terms of joining properties, particularly in terms of recyclability, corrosion resistance and reduced weight of the joined structure. Additionally, the manufacturing process is shorter since aluminium fasteners do not require coating. However, aluminium rivets can often not be used due to the insufficient mechanical strength of the fastener material in relation to the joining component materials.\r\nThis study systematically investigates the requirements for using solid alu-minium self-piercing rivets. The influence of rivet geometry adjustments on the joint quality is analysed using numerical simulation. The results are used to derive and evaluate an optimised rivet geometry for joining pure aluminium sheets. On this basis, solid self-drilling rivets with optimised geometry are manufactured from particle-reinforced aluminium produced in a continuous extrusion process by machining. The integration of particles increases the material’s strength. Exper-imental tests are conducted to evaluate the use of optimised solid self-piercing rivets. The quality-relevant parameters are determined and evaluated based on macrographs of the joints.","lang":"eng"}],"date_created":"2026-05-26T12:16:57Z","type":"book_chapter","keyword":["Solid self-piercing riveting cdot particle-reinforced aluminium cdot continuous powder extrusion cdot Joining technology cdot Rivet geometry cdot lightweight design"],"department":[{"_id":"43"},{"_id":"157"}],"status":"public","conference":{"location":"Coimbra","name":"4th International Conference on Advanced Joining Processes 2025"},"_id":"65689","publisher":"Springer Nature Switzerland","user_id":"61419","citation":{"bibtex":"@inbook{Koch_Weber_Meschut_Stadelmann_Böhm_Merklein_2026, place={Cham}, title={Particle-Reinforced Aluminium Solid Self-piercing Rivets for Joining Aluminium Alloy Sheets}, DOI={10.1007/978-3-032-23641-8_1}, booktitle={Proceedings in Engineering Mechanics}, publisher={Springer Nature Switzerland}, author={Koch, Steffen and Weber, Joshua and Meschut, Gerson and Stadelmann, Claudia and Böhm, Wolfgang and Merklein, Marion}, year={2026} }","ama":"Koch S, Weber J, Meschut G, Stadelmann C, Böhm W, Merklein M. Particle-Reinforced Aluminium Solid Self-piercing Rivets for Joining Aluminium Alloy Sheets. In: Proceedings in Engineering Mechanics. Springer Nature Switzerland; 2026. doi:10.1007/978-3-032-23641-8_1","mla":"Koch, Steffen, et al. “Particle-Reinforced Aluminium Solid Self-Piercing Rivets for Joining Aluminium Alloy Sheets.” Proceedings in Engineering Mechanics, Springer Nature Switzerland, 2026, doi:10.1007/978-3-032-23641-8_1.","short":"S. Koch, J. Weber, G. Meschut, C. Stadelmann, W. Böhm, M. Merklein, in: Proceedings in Engineering Mechanics, Springer Nature Switzerland, Cham, 2026.","chicago":"Koch, Steffen, Joshua Weber, Gerson Meschut, Claudia Stadelmann, Wolfgang Böhm, and Marion Merklein. “Particle-Reinforced Aluminium Solid Self-Piercing Rivets for Joining Aluminium Alloy Sheets.” In Proceedings in Engineering Mechanics. Cham: Springer Nature Switzerland, 2026. https://doi.org/10.1007/978-3-032-23641-8_1.","ieee":"S. Koch, J. Weber, G. Meschut, C. Stadelmann, W. Böhm, and M. Merklein, “Particle-Reinforced Aluminium Solid Self-piercing Rivets for Joining Aluminium Alloy Sheets,” in Proceedings in Engineering Mechanics, Cham: Springer Nature Switzerland, 2026.","apa":"Koch, S., Weber, J., Meschut, G., Stadelmann, C., Böhm, W., & Merklein, M. (2026). Particle-Reinforced Aluminium Solid Self-piercing Rivets for Joining Aluminium Alloy Sheets. In Proceedings in Engineering Mechanics. 4th International Conference on Advanced Joining Processes 2025, Coimbra. Springer Nature Switzerland. https://doi.org/10.1007/978-3-032-23641-8_1"},"quality_controlled":"1","place":"Cham"},{"_id":"59708","publisher":"University Library J. C. Senckenberg","user_id":"95559","volume":6,"status":"public","oa":"1","citation":{"ieee":"V. Wohnhas, P. Neumann, and B. Lütje-Klose, “Zeit für Arbeitszufriedenheit? Eine quantitativ-empirische Studie zur Bedeutung fester Kooperationszeiten für die Arbeitszufriedenheit von Lehrkräften in inklusiven Schulen,” QfI - Qualifizierung für Inklusion. Online-Zeitschrift zur Forschung über Aus-, Fort- und Weiterbildung pädagogischer Fachkräfte, vol. 6, no. 2, 2025, doi: 10.21248/qfi.167.","apa":"Wohnhas, V., Neumann, P., & Lütje-Klose, B. (2025). Zeit für Arbeitszufriedenheit? Eine quantitativ-empirische Studie zur Bedeutung fester Kooperationszeiten für die Arbeitszufriedenheit von Lehrkräften in inklusiven Schulen. QfI - Qualifizierung für Inklusion. Online-Zeitschrift zur Forschung über Aus-, Fort- und Weiterbildung pädagogischer Fachkräfte, 6(2). https://doi.org/10.21248/qfi.167","chicago":"Wohnhas, Verena, Phillip Neumann, and Birgit Lütje-Klose. “Zeit für Arbeitszufriedenheit? Eine quantitativ-empirische Studie zur Bedeutung fester Kooperationszeiten für die Arbeitszufriedenheit von Lehrkräften in inklusiven Schulen.” QfI - Qualifizierung für Inklusion. Online-Zeitschrift zur Forschung über Aus-, Fort- und Weiterbildung pädagogischer Fachkräfte 6, no. 2 (2025). https://doi.org/10.21248/qfi.167.","short":"V. Wohnhas, P. Neumann, B. Lütje-Klose, QfI - Qualifizierung für Inklusion. Online-Zeitschrift zur Forschung über Aus-, Fort- und Weiterbildung pädagogischer Fachkräfte 6 (2025).","mla":"Wohnhas, Verena, et al. “Zeit für Arbeitszufriedenheit? Eine quantitativ-empirische Studie zur Bedeutung fester Kooperationszeiten für die Arbeitszufriedenheit von Lehrkräften in inklusiven Schulen.” QfI - Qualifizierung für Inklusion. Online-Zeitschrift zur Forschung über Aus-, Fort- und Weiterbildung pädagogischer Fachkräfte, vol. 6, no. 2, University Library J. C. Senckenberg, 2025, doi:10.21248/qfi.167.","bibtex":"@article{Wohnhas_Neumann_Lütje-Klose_2025, title={Zeit für Arbeitszufriedenheit? Eine quantitativ-empirische Studie zur Bedeutung fester Kooperationszeiten für die Arbeitszufriedenheit von Lehrkräften in inklusiven Schulen}, volume={6}, DOI={10.21248/qfi.167}, number={2}, journal={QfI - Qualifizierung für Inklusion. Online-Zeitschrift zur Forschung über Aus-, Fort- und Weiterbildung pädagogischer Fachkräfte}, publisher={University Library J. C. Senckenberg}, author={Wohnhas, Verena and Neumann, Phillip and Lütje-Klose, Birgit}, year={2025} }","ama":"Wohnhas V, Neumann P, Lütje-Klose B. Zeit für Arbeitszufriedenheit? Eine quantitativ-empirische Studie zur Bedeutung fester Kooperationszeiten für die Arbeitszufriedenheit von Lehrkräften in inklusiven Schulen. QfI - Qualifizierung für Inklusion Online-Zeitschrift zur Forschung über Aus-, Fort- und Weiterbildung pädagogischer Fachkräfte. 2025;6(2). doi:10.21248/qfi.167"},"main_file_link":[{"open_access":"1","url":"https://www.qfi-oz.de/index.php/inklusion/article/view/167"}],"language":[{"iso":"ger"}],"doi":"10.21248/qfi.167","alternative_title":["Time for job satisfaction? A quantitative-empirical study on the significance of fixed cooperation times for the job satisfaction of teachers in inclusive schools"],"title":"Zeit für Arbeitszufriedenheit? Eine quantitativ-empirische Studie zur Bedeutung fester Kooperationszeiten für die Arbeitszufriedenheit von Lehrkräften in inklusiven Schulen","year":"2025","publication_identifier":{"issn":["2699-2477"]},"author":[{"full_name":"Wohnhas, Verena","first_name":"Verena","last_name":"Wohnhas"},{"first_name":"Phillip","last_name":"Neumann","full_name":"Neumann, Phillip","id":"95559"},{"full_name":"Lütje-Klose, Birgit","last_name":"Lütje-Klose","first_name":"Birgit"}],"date_updated":"2025-04-29T08:31:28Z","publication_status":"published","intvolume":" 6","article_type":"original","date_created":"2025-04-29T08:14:03Z","type":"journal_article","keyword":["Arbeitszufriedenheit","Inklusion","Sonderpädagogik","Kooperation","Selbstwirksamkeit","Schulentwicklung","job satisfaction","Inclusion","Special Education","Self-efficacy","school development"],"department":[{"_id":"854"}],"publication":"QfI - Qualifizierung für Inklusion. Online-Zeitschrift zur Forschung über Aus-, Fort- und Weiterbildung pädagogischer Fachkräfte","issue":"2","abstract":[{"text":"Die Arbeitszufriedenheit von Lehrkräften gilt als zentrale Komponente für die Qualität des Bil­dungssystems. In inklusiven Schulen müssen Regelschullehrkräfte und sonderpädagogische Lehrkräfte kooperieren, um allen Schüler:innen eine bestmögliche Förderung zu gewährleisten. Dazu benötigen sie jedoch Zeitfenster, die von vielen Lehrkräften als nicht ausreichend benannt werden. Ziel des vorliegenden Beitrags ist es, empirisch zu untersuchen, welche Bedeutung festen Zeitfenstern für die Lehrkräftekooperation im Klassenteam, im Jahrgangsteam und im Fachteam für die Arbeitszufriedenheit zukommt. Weiterhin soll überprüft werden, ob Teile der Zusammenhänge über die Zufriedenheit mit der Kooperationshäufigkeit und die kollektive Selbstwirksamkeitsüberzeugung der Lehrkräfte erklärt werden können. Dazu werden Daten aus dem BMBF-geförderten Projekt BiFoKi mit N=194 Lehrkräften und N=28 Schulleitungen analy­siert. Die Ergebnisse zeigen, dass feste Zeitfenster für die Kooperation in den unterschiedlichen Teams mit einer erhöhten Arbeitszufriedenheit im Zusammenhang stehen und in Teilen über die kollektive Selbstwirksamkeitsüberzeugung mediiert werden.","lang":"ger"},{"text":"The job satisfaction of teachers is considered a central component for the quality of the educa­tion system. In inclusive schools, regular school teachers and special needs teachers must co­operate in order to ensure that all pupils receive the best possible support. To do this, however, they need time slots that many teachers say are not sufficient. The aim of this article is to em­pirically investigate the importance of fixed time slots for teacher cooperation in the class team, the year team and the expert team for job satisfaction. Furthermore, it will be examined whether parts of the correlations can be explained by satisfaction with the frequency of cooperation and the teachers' collective self-efficacy expectations. To this end, data from the BMBF-funded BiFoKi project with N=194 teachers and N=28 head teachers will be analyzed. The results show that fixed time slots for cooperation in the different teams are associated with increased job satisfaction and are mediated in part by collective self-efficacy expectations.","lang":"eng"}]},{"doi":"10.1051/matecconf/202540801081","language":[{"iso":"eng"}],"main_file_link":[{"url":"\thttps://doi.org/10.1051/matecconf/202540801081","open_access":"1"}],"article_number":"01081","intvolume":" 408","article_type":"original","date_updated":"2026-02-24T13:41:58Z","publication_status":"published","author":[{"last_name":"Neuser","first_name":"Moritz","full_name":"Neuser, Moritz","id":"32340"},{"id":"61977","first_name":"Malte Christian","last_name":"Schlichter","full_name":"Schlichter, Malte Christian"},{"id":"48411","full_name":"Hoyer, Kay-Peter","last_name":"Hoyer","first_name":"Kay-Peter"},{"first_name":"Mathias","last_name":"Bobbert","full_name":"Bobbert, Mathias","id":"7850"},{"id":"32056","last_name":"Meschut","first_name":"Gerson","orcid":"0000-0002-2763-1246","full_name":"Meschut, Gerson"},{"full_name":"Schaper, Mirko","first_name":"Mirko","last_name":"Schaper","id":"43720"}],"title":"Mechanical joinability of microstructurally graded structural components manufactured from hypoeutectic aluminium casting alloys","year":"2025","department":[{"_id":"43"},{"_id":"158"},{"_id":"157"},{"_id":"9"},{"_id":"321"}],"keyword":["Joining","Casting","Self-pierce riveting","Aluminium casting alloy"],"type":"journal_article","date_created":"2025-05-12T15:21:06Z","abstract":[{"text":"Lightweight design is a driving concept in modern automotive engineering to minimize resource consumption over a vehicle's lifecycle through multi-material design, which relies on the use of joining techniques in car body fabrication. Multi-material design and the increasing trend towards producing large structural components using the megacasting process pose considerable challenges, particularly in the mechanical joining of aluminium-silicon (AlSi) castings. These castings typically exhibit low ductility and are prone to cracking when mechanically joined. Based on the excellent castability of hypoeutectic AlSi alloys, these are applied in sand casting and die casting as well as in megacasting. With a silicon content between 7 wt% and 12 wt%, these AlSi-alloys have a plate-like silicon phase that initiates cracks during mechanical joining. To enhance the joinability of castings, the research hypothesis is that improved solidification conditions enable a significant modification in the microstructure and therefore, increase the mechanical properties. During the manufacture of the castings using the sand casting process, the solidification conditions within the structural elements are varied to modify the microstructure to obtain castings with graded microstructure. The castings are evaluated using mechanical, microstructural and joining testing methods and finally, a microstructure-joinability correlation is established.","lang":"eng"}],"publication":"44th Conference of the International Deep Drawing Research Group (IDDRG 2025)","volume":408,"user_id":"7850","_id":"59872","conference":{"location":"Lissabon (Portugal)","name":"44th Conference of the International Deep Drawing Research Group (IDDRG 2025)","start_date":"2025-06-02","end_date":"2025-06-05"},"status":"public","oa":"1","project":[{"_id":"131","name":"TRR 285 - A: TRR 285 - Project Area A"},{"name":"TRR 285 – A02: TRR 285 - Subproject A02","_id":"136"},{"name":"TRR 285 – A01: TRR 285 - Subproject A01","_id":"135"},{"name":"TRR 285: Methodenentwicklung zur mechanischen Fügbarkeit in wandlungsfähigen Prozessketten","_id":"130"}],"quality_controlled":"1","citation":{"bibtex":"@article{Neuser_Schlichter_Hoyer_Bobbert_Meschut_Schaper_2025, title={Mechanical joinability of microstructurally graded structural components manufactured from hypoeutectic aluminium casting alloys}, volume={408}, DOI={10.1051/matecconf/202540801081}, number={01081}, journal={44th Conference of the International Deep Drawing Research Group (IDDRG 2025)}, author={Neuser, Moritz and Schlichter, Malte Christian and Hoyer, Kay-Peter and Bobbert, Mathias and Meschut, Gerson and Schaper, Mirko}, year={2025} }","ama":"Neuser M, Schlichter MC, Hoyer K-P, Bobbert M, Meschut G, Schaper M. Mechanical joinability of microstructurally graded structural components manufactured from hypoeutectic aluminium casting alloys. 44th Conference of the International Deep Drawing Research Group (IDDRG 2025). 2025;408. doi:10.1051/matecconf/202540801081","short":"M. Neuser, M.C. Schlichter, K.-P. Hoyer, M. Bobbert, G. Meschut, M. Schaper, 44th Conference of the International Deep Drawing Research Group (IDDRG 2025) 408 (2025).","chicago":"Neuser, Moritz, Malte Christian Schlichter, Kay-Peter Hoyer, Mathias Bobbert, Gerson Meschut, and Mirko Schaper. “Mechanical Joinability of Microstructurally Graded Structural Components Manufactured from Hypoeutectic Aluminium Casting Alloys.” 44th Conference of the International Deep Drawing Research Group (IDDRG 2025) 408 (2025). https://doi.org/10.1051/matecconf/202540801081.","ieee":"M. Neuser, M. C. Schlichter, K.-P. Hoyer, M. Bobbert, G. Meschut, and M. Schaper, “Mechanical joinability of microstructurally graded structural components manufactured from hypoeutectic aluminium casting alloys,” 44th Conference of the International Deep Drawing Research Group (IDDRG 2025), vol. 408, Art. no. 01081, 2025, doi: 10.1051/matecconf/202540801081.","mla":"Neuser, Moritz, et al. “Mechanical Joinability of Microstructurally Graded Structural Components Manufactured from Hypoeutectic Aluminium Casting Alloys.” 44th Conference of the International Deep Drawing Research Group (IDDRG 2025), vol. 408, 01081, 2025, doi:10.1051/matecconf/202540801081.","apa":"Neuser, M., Schlichter, M. C., Hoyer, K.-P., Bobbert, M., Meschut, G., & Schaper, M. (2025). Mechanical joinability of microstructurally graded structural components manufactured from hypoeutectic aluminium casting alloys. 44th Conference of the International Deep Drawing Research Group (IDDRG 2025), 408, Article 01081. https://doi.org/10.1051/matecconf/202540801081"}},{"date_updated":"2025-10-16T11:56:36Z","author":[{"first_name":"Radu Ioan","last_name":"Bot","full_name":"Bot, Radu Ioan"},{"first_name":"Konstantin","last_name":"Sonntag","orcid":"https://orcid.org/0000-0003-3384-3496","full_name":"Sonntag, Konstantin","id":"56399"}],"year":"2025","title":"Inertial dynamics with vanishing Tikhonov regularization for multobjective optimization","language":[{"iso":"eng"}],"main_file_link":[{"url":"https://arxiv.org/pdf/2411.18422"}],"abstract":[{"lang":"eng","text":"In this paper we introduce, in a Hilbert space setting, a second order dynamical system with asymptotically vanishing damping and vanishing Tikhonov regularization that approaches a multiobjective optimization problem with convex and differentiable components of the objective function. Trajectory solutions are shown to exist in finite dimensions. We prove fast convergence of the function values, quantified in terms of a merit function. Based on the regime considered, we establish both weak and, in some cases, strong convergence of trajectory solutions toward a weak Pareto optimal solution. To achieve this, we apply Tikhonov regularization individually to each component of the objective function. This work extends results from single objective convex optimization into the multiobjective setting."}],"publication":"Journal of Mathematical Analysis and Applications","department":[{"_id":"101"},{"_id":"530"},{"_id":"655"}],"keyword":["Pareto optimization","Lyapunov analysis","gradient-like dynamical systems","inertial dynamics","asymptotic vanishing damping","Tikhonov regularization","strong convergence"],"type":"journal_article","date_created":"2024-11-28T08:58:17Z","file":[{"relation":"main_file","date_updated":"2024-11-28T08:58:00Z","file_name":"Inertial dynamics with vanishing Tikhonov regularization for multobjective optimization.pdf","file_size":4291134,"access_level":"open_access","file_id":"57473","content_type":"application/pdf","creator":"sonntagk","date_created":"2024-11-28T08:58:00Z"}],"has_accepted_license":"1","status":"public","ddc":["510"],"user_id":"56399","_id":"57472","citation":{"short":"R.I. Bot, K. Sonntag, Journal of Mathematical Analysis and Applications (2025).","chicago":"Bot, Radu Ioan, and Konstantin Sonntag. “Inertial Dynamics with Vanishing Tikhonov Regularization for Multobjective Optimization.” Journal of Mathematical Analysis and Applications, 2025.","ieee":"R. I. Bot and K. Sonntag, “Inertial dynamics with vanishing Tikhonov regularization for multobjective optimization,” Journal of Mathematical Analysis and Applications, 2025.","apa":"Bot, R. I., & Sonntag, K. (2025). Inertial dynamics with vanishing Tikhonov regularization for multobjective optimization. Journal of Mathematical Analysis and Applications.","bibtex":"@article{Bot_Sonntag_2025, title={Inertial dynamics with vanishing Tikhonov regularization for multobjective optimization}, journal={Journal of Mathematical Analysis and Applications}, author={Bot, Radu Ioan and Sonntag, Konstantin}, year={2025} }","ama":"Bot RI, Sonntag K. Inertial dynamics with vanishing Tikhonov regularization for multobjective optimization. Journal of Mathematical Analysis and Applications. Published online 2025.","mla":"Bot, Radu Ioan, and Konstantin Sonntag. “Inertial Dynamics with Vanishing Tikhonov Regularization for Multobjective Optimization.” Journal of Mathematical Analysis and Applications, 2025."},"file_date_updated":"2024-11-28T08:58:00Z","oa":"1","external_id":{"arxiv":["2411.18422"]}},{"project":[{"name":"Self-Regulated Learning for Entrepreneurs – Förderung der Selbstregulationsfähigkeit angehender Unternehmer*innen","_id":"618"}],"quality_controlled":"1","citation":{"bibtex":"@inbook{Fahrbach_Jenert_Fust_Bellwald_Winkler_2025, title={Fostering self-regulated entrepreneurial learning in entrepreneurship education}, DOI={10.4337/9781035325795.00021}, booktitle={Annals of Entrepreneurship Education and Pedagogy - 2025}, publisher={Edward Elgar Publishing}, author={Fahrbach, Manuel and Jenert, Tobias and Fust, Alexander and Bellwald, Noah and Winkler, Christoph}, year={2025}, pages={249–265} }","ama":"Fahrbach M, Jenert T, Fust A, Bellwald N, Winkler C. Fostering self-regulated entrepreneurial learning in entrepreneurship education. In: Annals of Entrepreneurship Education and Pedagogy - 2025. Edward Elgar Publishing; 2025:249–265. doi:10.4337/9781035325795.00021","mla":"Fahrbach, Manuel, et al. “Fostering Self-Regulated Entrepreneurial Learning in Entrepreneurship Education.” Annals of Entrepreneurship Education and Pedagogy - 2025, Edward Elgar Publishing, 2025, pp. 249–265, doi:10.4337/9781035325795.00021.","chicago":"Fahrbach, Manuel, Tobias Jenert, Alexander Fust, Noah Bellwald, and Christoph Winkler. “Fostering Self-Regulated Entrepreneurial Learning in Entrepreneurship Education.” In Annals of Entrepreneurship Education and Pedagogy - 2025, 249–265. Edward Elgar Publishing, 2025. https://doi.org/10.4337/9781035325795.00021.","short":"M. Fahrbach, T. Jenert, A. Fust, N. Bellwald, C. Winkler, in: Annals of Entrepreneurship Education and Pedagogy - 2025, Edward Elgar Publishing, 2025, pp. 249–265.","ieee":"M. Fahrbach, T. Jenert, A. Fust, N. Bellwald, and C. Winkler, “Fostering self-regulated entrepreneurial learning in entrepreneurship education,” in Annals of Entrepreneurship Education and Pedagogy - 2025, Edward Elgar Publishing, 2025, pp. 249–265.","apa":"Fahrbach, M., Jenert, T., Fust, A., Bellwald, N., & Winkler, C. (2025). Fostering self-regulated entrepreneurial learning in entrepreneurship education. In Annals of Entrepreneurship Education and Pedagogy - 2025 (pp. 249–265). Edward Elgar Publishing. https://doi.org/10.4337/9781035325795.00021"},"status":"public","user_id":"71994","_id":"58874","publisher":"Edward Elgar Publishing","page":"249–265","publication":"Annals of Entrepreneurship Education and Pedagogy - 2025","department":[{"_id":"208"},{"_id":"640"}],"type":"book_chapter","keyword":["Self-Regulated Learning","Entrepreneurship Education","Entrepreneurship Research"],"date_created":"2025-02-28T14:42:29Z","publication_status":"published","date_updated":"2025-12-08T10:57:18Z","publication_identifier":{"isbn":["9781035325795","9781035325788","9781035325795"]},"author":[{"first_name":"Manuel","last_name":"Fahrbach","full_name":"Fahrbach, Manuel"},{"orcid":" https://orcid.org/0000-0001-9262-5646","last_name":"Jenert","first_name":"Tobias","full_name":"Jenert, Tobias","id":"71994"},{"full_name":"Fust, Alexander","first_name":"Alexander","last_name":"Fust"},{"last_name":"Bellwald","first_name":"Noah","full_name":"Bellwald, Noah"},{"full_name":"Winkler, Christoph","last_name":"Winkler","first_name":"Christoph"}],"year":"2025","title":"Fostering self-regulated entrepreneurial learning in entrepreneurship education","doi":"10.4337/9781035325795.00021","language":[{"iso":"eng"}]},{"author":[{"first_name":"Carlos","last_name":"Hernández","full_name":"Hernández, Carlos"},{"full_name":"Rodriguez-Fernandez, Angel E.","last_name":"Rodriguez-Fernandez","first_name":"Angel E."},{"last_name":"Schäpermeier","first_name":"Lennart","full_name":"Schäpermeier, Lennart"},{"last_name":"Cuate","first_name":"Oliver","full_name":"Cuate, Oliver"},{"id":"100740","full_name":"Trautmann, Heike","last_name":"Trautmann","first_name":"Heike","orcid":"0000-0002-9788-8282"},{"full_name":"Schütze, Oliver","first_name":"Oliver","last_name":"Schütze"}],"year":"2025","status":"public","title":"An Evolutionary Approach for the Computation of ∈-Locally Optimal Solutions for Multi-Objective Multimodal Optimization","date_updated":"2025-12-12T06:13:51Z","_id":"63053","language":[{"iso":"eng"}],"page":"1-1","doi":"10.1109/TEVC.2025.3637276","user_id":"15504","citation":{"ama":"Hernández C, Rodriguez-Fernandez AE, Schäpermeier L, Cuate O, Trautmann H, Schütze O. An Evolutionary Approach for the Computation of ∈-Locally Optimal Solutions for Multi-Objective Multimodal Optimization. IEEE Transactions on Evolutionary Computation. Published online 2025:1-1. doi:10.1109/TEVC.2025.3637276","bibtex":"@article{Hernández_Rodriguez-Fernandez_Schäpermeier_Cuate_Trautmann_Schütze_2025, title={An Evolutionary Approach for the Computation of ∈-Locally Optimal Solutions for Multi-Objective Multimodal Optimization}, DOI={10.1109/TEVC.2025.3637276}, journal={IEEE Transactions on Evolutionary Computation}, author={Hernández, Carlos and Rodriguez-Fernandez, Angel E. and Schäpermeier, Lennart and Cuate, Oliver and Trautmann, Heike and Schütze, Oliver}, year={2025}, pages={1–1} }","mla":"Hernández, Carlos, et al. “An Evolutionary Approach for the Computation of ∈-Locally Optimal Solutions for Multi-Objective Multimodal Optimization.” IEEE Transactions on Evolutionary Computation, 2025, pp. 1–1, doi:10.1109/TEVC.2025.3637276.","short":"C. Hernández, A.E. Rodriguez-Fernandez, L. Schäpermeier, O. Cuate, H. Trautmann, O. Schütze, IEEE Transactions on Evolutionary Computation (2025) 1–1.","chicago":"Hernández, Carlos, Angel E. Rodriguez-Fernandez, Lennart Schäpermeier, Oliver Cuate, Heike Trautmann, and Oliver Schütze. “An Evolutionary Approach for the Computation of ∈-Locally Optimal Solutions for Multi-Objective Multimodal Optimization.” IEEE Transactions on Evolutionary Computation, 2025, 1–1. https://doi.org/10.1109/TEVC.2025.3637276.","apa":"Hernández, C., Rodriguez-Fernandez, A. E., Schäpermeier, L., Cuate, O., Trautmann, H., & Schütze, O. (2025). An Evolutionary Approach for the Computation of ∈-Locally Optimal Solutions for Multi-Objective Multimodal Optimization. IEEE Transactions on Evolutionary Computation, 1–1. https://doi.org/10.1109/TEVC.2025.3637276","ieee":"C. Hernández, A. E. Rodriguez-Fernandez, L. Schäpermeier, O. Cuate, H. Trautmann, and O. Schütze, “An Evolutionary Approach for the Computation of ∈-Locally Optimal Solutions for Multi-Objective Multimodal Optimization,” IEEE Transactions on Evolutionary Computation, pp. 1–1, 2025, doi: 10.1109/TEVC.2025.3637276."},"publication":"IEEE Transactions on Evolutionary Computation","date_created":"2025-12-12T06:13:06Z","department":[{"_id":"819"}],"type":"journal_article","keyword":["Optimization","Evolutionary computation","Hands","Proposals","Convergence","Computational efficiency","Artificial intelligence","Accuracy","Approximation algorithms","Aerospace electronics","Multi-objective optimization","evolutionary algorithms","nearly optimal solutions","multimodal optimization","archiving","continuation"]},{"conference":{"end_date":"2025-07-18","location":"Porto","start_date":"2025-07-15","name":"8th International Conference on Integrity-Reliability-Failure (IRF2025)"},"status":"public","editor":[{"full_name":"Gomes, J.F. Silva","last_name":"Gomes","first_name":"J.F. Silva"},{"first_name":"Shaker A.","last_name":"Meguid","full_name":"Meguid, Shaker A."}],"user_id":"114764","_id":"61149","publisher":"FEUP","project":[{"name":"TRR 285 - Project Area C","_id":"133"},{"name":"TRR 285 - Subproject C04","_id":"148"},{"name":"TRR 285: Methodenentwicklung zur mechanischen Fügbarkeit in wandlungsfähigen Prozessketten","_id":"130"},{"_id":"131","name":"TRR 285 - Project Area A"},{"name":"TRR 285 - Subproject A03","_id":"137"},{"name":"TRR 285 - Subproject A01","_id":"135"}],"citation":{"short":"A. Dargel, B. Gröger, M.C. Schlichter, J. Gerritzen, D. Köhler, G. Meschut, M. Gude, R. Kupfer, in: J.F.S. Gomes, S.A. Meguid (Eds.), Proceedings of the 8th International Conference on Integrity-Reliability-Failure (IRF2025), FEUP, Porto, 2025.","ama":"Dargel A, Gröger B, Schlichter MC, et al. Local Deformation and Failure of Composites during Self-Piercing Riveting: A CT-Based Microstructure Investigation. In: Gomes JFS, Meguid SA, eds. Proceedings of the 8th International Conference on Integrity-Reliability-Failure (IRF2025). FEUP; 2025. doi:10.24840/978-972-752-323-8","chicago":"Dargel, Alrik, Benjamin Gröger, Malte Christian Schlichter, Johannes Gerritzen, Daniel Köhler, Gerson Meschut, Maik Gude, and Robert Kupfer. “Local Deformation and Failure of Composites during Self-Piercing Riveting: A CT-Based Microstructure Investigation.” In Proceedings of the 8th International Conference on Integrity-Reliability-Failure (IRF2025), edited by J.F. Silva Gomes and Shaker A. Meguid. Porto: FEUP, 2025. https://doi.org/10.24840/978-972-752-323-8.","bibtex":"@inproceedings{Dargel_Gröger_Schlichter_Gerritzen_Köhler_Meschut_Gude_Kupfer_2025, place={Porto}, title={Local Deformation and Failure of Composites during Self-Piercing Riveting: A CT-Based Microstructure Investigation}, DOI={10.24840/978-972-752-323-8}, booktitle={Proceedings of the 8th International Conference on Integrity-Reliability-Failure (IRF2025)}, publisher={FEUP}, author={Dargel, Alrik and Gröger, Benjamin and Schlichter, Malte Christian and Gerritzen, Johannes and Köhler, Daniel and Meschut, Gerson and Gude, Maik and Kupfer, Robert}, editor={Gomes, J.F. Silva and Meguid, Shaker A.}, year={2025} }","mla":"Dargel, Alrik, et al. “Local Deformation and Failure of Composites during Self-Piercing Riveting: A CT-Based Microstructure Investigation.” Proceedings of the 8th International Conference on Integrity-Reliability-Failure (IRF2025), edited by J.F. Silva Gomes and Shaker A. Meguid, FEUP, 2025, doi:10.24840/978-972-752-323-8.","apa":"Dargel, A., Gröger, B., Schlichter, M. C., Gerritzen, J., Köhler, D., Meschut, G., Gude, M., & Kupfer, R. (2025). Local Deformation and Failure of Composites during Self-Piercing Riveting: A CT-Based Microstructure Investigation. In J. F. S. Gomes & S. A. Meguid (Eds.), Proceedings of the 8th International Conference on Integrity-Reliability-Failure (IRF2025). FEUP. https://doi.org/10.24840/978-972-752-323-8","ieee":"A. Dargel et al., “Local Deformation and Failure of Composites during Self-Piercing Riveting: A CT-Based Microstructure Investigation,” in Proceedings of the 8th International Conference on Integrity-Reliability-Failure (IRF2025), Porto, 2025, doi: 10.24840/978-972-752-323-8."},"oa":"1","place":"Porto","date_updated":"2026-05-07T08:40:51Z","publication_status":"published","publication_identifier":{"isbn":["9789727523238"]},"author":[{"id":"114764","full_name":"Dargel, Alrik","last_name":"Dargel","first_name":"Alrik"},{"last_name":"Gröger","first_name":"Benjamin","full_name":"Gröger, Benjamin"},{"id":"61977","full_name":"Schlichter, Malte Christian","last_name":"Schlichter","first_name":"Malte Christian"},{"id":"105344","last_name":"Gerritzen","first_name":"Johannes","orcid":"0000-0002-0169-8602","full_name":"Gerritzen, Johannes"},{"full_name":"Köhler, Daniel","first_name":"Daniel","last_name":"Köhler","id":"83408"},{"id":"32056","first_name":"Gerson","orcid":"0000-0002-2763-1246","last_name":"Meschut","full_name":"Meschut, Gerson"},{"last_name":"Gude","first_name":"Maik","full_name":"Gude, Maik"},{"full_name":"Kupfer, Robert","last_name":"Kupfer","first_name":"Robert"}],"year":"2025","title":"Local Deformation and Failure of Composites during Self-Piercing Riveting: A CT-Based Microstructure Investigation","doi":"10.24840/978-972-752-323-8","language":[{"iso":"eng"}],"main_file_link":[{"url":"https://www.researchgate.net/publication/395593556_LOCAL_DEFORMATION_AND_FAILURE_OF_COMPOSITES_DURING_SELF-PIERCING_RIVETING_A_CT_BASED_MICROSTRUCTURE_INVESTIGATION","open_access":"1"}],"abstract":[{"text":"The use of continuous fiber-reinforced thermoplastics (FRTP) in automotive industry increases due to their excellent material properties and possibility of rapid processing. The scale spanning heterogeneity of their material structure and its influence on the material behavior, however, presents significant challenges for most joining technologies, such as self-piercing riveting (SPR). During mechanical joining, the material structure is significantly altered within and around the joining zone, heavily influencing the material behavior. A comprehensive understanding of the underlying phenomena of material alteration during the SPR process is essential as basis for validating numerical simulations. This study examines the material structure at ten stages of a step-setting test of SPR with two FRTP sheets with glass-fiber reinforcement. Utilizing X-ray computed tomography (CT), the damage phenomena within different areas of the setting test are analyzed three-dimensionally and key parameters are quantified. Dominating phenomena during the penetration of the rivet into the laminate are fiber failure (FF), interfiber failure (IFF) and fiber bending, while delamination, fiber kinking and roving splitting are also observed. At the final stages, the bottom layers of the second sheet collapse and form a bulge into the cavity of the die.","lang":"eng"}],"publication":"Proceedings of the 8th International Conference on Integrity-Reliability-Failure (IRF2025)","type":"conference","keyword":["self-piercing riveting","computed tomography","thermoplastic composites","process-structure-interaction"],"date_created":"2025-09-08T11:52:45Z"},{"doi":"10.1177/14644207251319922","language":[{"iso":"eng"}],"date_updated":"2026-05-12T12:13:31Z","publication_status":"published","article_type":"original","year":"2025","title":"Mechanical properties and joinability of the near-eutectic aluminium casting alloy AlSi12","author":[{"id":"32340","first_name":"Moritz","last_name":"Neuser","full_name":"Neuser, Moritz"},{"first_name":"Pia Katharina","last_name":"Holtkamp","full_name":"Holtkamp, Pia Katharina","id":"44935"},{"full_name":"Hoyer, Kay-Peter","first_name":"Kay-Peter","last_name":"Hoyer","id":"48411"},{"full_name":"Kappe, Fabian","first_name":"Fabian","last_name":"Kappe","id":"66459"},{"full_name":"Yildiz, Safak","first_name":"Safak","last_name":"Yildiz"},{"full_name":"Bobbert, Mathias","first_name":"Mathias","last_name":"Bobbert","id":"7850"},{"id":"32056","full_name":"Meschut, Gerson","orcid":"0000-0002-2763-1246","first_name":"Gerson","last_name":"Meschut"},{"id":"43720","first_name":"Mirko","last_name":"Schaper","full_name":"Schaper, Mirko"}],"type":"journal_article","keyword":["aluminium","casting","microstructure","joinability","self-piercing riveting"],"department":[{"_id":"43"},{"_id":"158"},{"_id":"157"},{"_id":"9"},{"_id":"321"}],"date_created":"2025-02-24T10:25:31Z","abstract":[{"text":"One of the most important strategies for reducing CO2 emissions in the mobility sector is lightweight construction. In particular, the car body offers several opportunities for weight reduction. Multi-material designs are increasingly being applied to select the most suitable material for the respective load and ultimately achieve synergy effects. For example, aluminium castings are used at the nodes of a spaceframe body. Subsequently, these are joined with profiles to form the bodyshell. To join different materials mechanical joining techniques, such as semi-tubular self-piercing riveting, are deployed. According to the current state of the art, cracks occur in the aluminium castings during the mechanical joining process as a result of the high degree of deformation. Although the aluminium casting alloys of the AlSi-system exhibit low ductility, these alloys reveal excellent castability. In particular, the ability to cast thin structural parts is enabled by the low liquidus point of the near eutectic aluminium casting alloys.\r\nThis study addresses the mechanical joining properties of the near eutectic aluminium casting alloy AlSi12, depending on different microstructures. These are achieved by annealing processes and modifying agents. Through an adapted heat treatment, the previously lamellar morphology can be transformed into a globular morphology, which leads to increased ductility and prevents the formation of cracks during the self-piercing riveting (SPR). The joinability is investigated using different die geometries, whereas the joint formation is analysed regarding crack initiation. To evaluate the increased ductility, microstructural and mechanical tests are performed and finally, a microstructure-joinability correlation is established.","lang":"eng"}],"publication":"The Journal of Materials: Design and Applications, Part L","user_id":"7850","publisher":"Sage Publications","_id":"58807","has_accepted_license":"1","status":"public","conference":{"end_date":"2024-07-05","location":"Porto, Portugal","start_date":"2024-07-04","name":"5th International Conference on Materials Design and Applications 2024"},"quality_controlled":"1","project":[{"_id":"131","name":"TRR 285 - A: TRR 285 - Project Area A"},{"_id":"136","name":"TRR 285 – A02: TRR 285 - Subproject A02"},{"name":"TRR 285 - C: TRR 285 - Project Area C","_id":"133"},{"name":"TRR 285 – C02: TRR 285 - Subproject C02","_id":"146"},{"name":"TRR 285: Methodenentwicklung zur mechanischen Fügbarkeit in wandlungsfähigen Prozessketten","_id":"130"}],"citation":{"chicago":"Neuser, Moritz, Pia Katharina Holtkamp, Kay-Peter Hoyer, Fabian Kappe, Safak Yildiz, Mathias Bobbert, Gerson Meschut, and Mirko Schaper. “Mechanical Properties and Joinability of the Near-Eutectic Aluminium Casting Alloy AlSi12.” The Journal of Materials: Design and Applications, Part L, 2025. https://doi.org/10.1177/14644207251319922.","short":"M. Neuser, P.K. Holtkamp, K.-P. Hoyer, F. Kappe, S. Yildiz, M. Bobbert, G. Meschut, M. Schaper, The Journal of Materials: Design and Applications, Part L (2025).","apa":"Neuser, M., Holtkamp, P. K., Hoyer, K.-P., Kappe, F., Yildiz, S., Bobbert, M., Meschut, G., & Schaper, M. (2025). Mechanical properties and joinability of the near-eutectic aluminium casting alloy AlSi12. The Journal of Materials: Design and Applications, Part L. 5th International Conference on Materials Design and Applications 2024, Porto, Portugal. https://doi.org/10.1177/14644207251319922","ieee":"M. Neuser et al., “Mechanical properties and joinability of the near-eutectic aluminium casting alloy AlSi12,” The Journal of Materials: Design and Applications, Part L, 2025, doi: 10.1177/14644207251319922.","ama":"Neuser M, Holtkamp PK, Hoyer K-P, et al. Mechanical properties and joinability of the near-eutectic aluminium casting alloy AlSi12. The Journal of Materials: Design and Applications, Part L. Published online 2025. doi:10.1177/14644207251319922","bibtex":"@article{Neuser_Holtkamp_Hoyer_Kappe_Yildiz_Bobbert_Meschut_Schaper_2025, title={Mechanical properties and joinability of the near-eutectic aluminium casting alloy AlSi12}, DOI={10.1177/14644207251319922}, journal={The Journal of Materials: Design and Applications, Part L}, publisher={Sage Publications}, author={Neuser, Moritz and Holtkamp, Pia Katharina and Hoyer, Kay-Peter and Kappe, Fabian and Yildiz, Safak and Bobbert, Mathias and Meschut, Gerson and Schaper, Mirko}, year={2025} }","mla":"Neuser, Moritz, et al. “Mechanical Properties and Joinability of the Near-Eutectic Aluminium Casting Alloy AlSi12.” The Journal of Materials: Design and Applications, Part L, Sage Publications, 2025, doi:10.1177/14644207251319922."}},{"publisher":"Materials Research Forum LLC","_id":"60290","page":"101 - 108","volume":52,"editor":[{"full_name":"Meschut, Gerson","first_name":"Gerson","last_name":"Meschut"},{"full_name":"Bobbert, Mathias","last_name":"Bobbert","first_name":"Mathias"},{"full_name":"Duflou, Joost","first_name":"Joost","last_name":"Duflou"},{"full_name":"Fratini, Livan","first_name":"Livan","last_name":"Fratini"},{"full_name":"Hagenah, Hinnerk","last_name":"Hagenah","first_name":"Hinnerk"},{"first_name":"Paulo A. F.","last_name":"Martins","full_name":"Martins, Paulo A. F."},{"full_name":"Merklein, Marion","last_name":"Merklein","first_name":"Marion"},{"full_name":"Micari, Fabrizio","first_name":"Fabrizio","last_name":"Micari"}],"user_id":"7850","conference":{"location":"Paderborn","start_date":"2025-04-01","name":"21st International Conference on Sheet Metal","end_date":"2025-04-03"},"status":"public","place":"Millersville","citation":{"bibtex":"@inproceedings{Lüder_Holtkamp_Wituschek_Bobbert_Meschut_Lechner_Schmale_2025, place={Millersville}, series={Sheet Metal 2025}, title={Analysis of the binding mechanisms depending on versatile process variants of self-piercing riveting}, volume={52}, DOI={10.21741/9781644903551-13}, booktitle={Materials Research Proceedings}, publisher={Materials Research Forum LLC}, author={Lüder, Stephan and Holtkamp, Pia Katharina and Wituschek, Simon and Bobbert, Mathias and Meschut, Gerson and Lechner, Michael and Schmale, Hans Christian}, editor={Meschut, Gerson and Bobbert, Mathias and Duflou, Joost and Fratini, Livan and Hagenah, Hinnerk and Martins, Paulo A. F. and Merklein, Marion and Micari, Fabrizio}, year={2025}, pages={101–108}, collection={Sheet Metal 2025} }","ama":"Lüder S, Holtkamp PK, Wituschek S, et al. Analysis of the binding mechanisms depending on versatile process variants of self-piercing riveting. In: Meschut G, Bobbert M, Duflou J, et al., eds. Materials Research Proceedings. Vol 52. Sheet Metal 2025. Materials Research Forum LLC; 2025:101-108. doi:10.21741/9781644903551-13","mla":"Lüder, Stephan, et al. “Analysis of the Binding Mechanisms Depending on Versatile Process Variants of Self-Piercing Riveting.” Materials Research Proceedings, edited by Gerson Meschut et al., vol. 52, Materials Research Forum LLC, 2025, pp. 101–08, doi:10.21741/9781644903551-13.","short":"S. Lüder, P.K. Holtkamp, S. Wituschek, M. Bobbert, G. Meschut, M. Lechner, H.C. Schmale, in: G. Meschut, M. Bobbert, J. Duflou, L. Fratini, H. Hagenah, P.A.F. Martins, M. Merklein, F. Micari (Eds.), Materials Research Proceedings, Materials Research Forum LLC, Millersville, 2025, pp. 101–108.","chicago":"Lüder, Stephan, Pia Katharina Holtkamp, Simon Wituschek, Mathias Bobbert, Gerson Meschut, Michael Lechner, and Hans Christian Schmale. “Analysis of the Binding Mechanisms Depending on Versatile Process Variants of Self-Piercing Riveting.” In Materials Research Proceedings, edited by Gerson Meschut, Mathias Bobbert, Joost Duflou, Livan Fratini, Hinnerk Hagenah, Paulo A. F. Martins, Marion Merklein, and Fabrizio Micari, 52:101–8. Sheet Metal 2025. Millersville: Materials Research Forum LLC, 2025. https://doi.org/10.21741/9781644903551-13.","ieee":"S. Lüder et al., “Analysis of the binding mechanisms depending on versatile process variants of self-piercing riveting,” in Materials Research Proceedings, Paderborn, 2025, vol. 52, pp. 101–108, doi: 10.21741/9781644903551-13.","apa":"Lüder, S., Holtkamp, P. K., Wituschek, S., Bobbert, M., Meschut, G., Lechner, M., & Schmale, H. C. (2025). Analysis of the binding mechanisms depending on versatile process variants of self-piercing riveting. In G. Meschut, M. Bobbert, J. Duflou, L. Fratini, H. Hagenah, P. A. F. Martins, M. Merklein, & F. Micari (Eds.), Materials Research Proceedings (Vol. 52, pp. 101–108). Materials Research Forum LLC. https://doi.org/10.21741/9781644903551-13"},"project":[{"name":"TRR 285 - A: TRR 285 - Project Area A","_id":"131"},{"_id":"138","name":"TRR 285 – A04: TRR 285 - Subproject A04"},{"name":"TRR 285 - C: TRR 285 - Project Area C","_id":"133"},{"_id":"146","name":"TRR 285 – C02: TRR 285 - Subproject C02"},{"name":"TRR 285: Methodenentwicklung zur mechanischen Fügbarkeit in wandlungsfähigen Prozessketten","_id":"130"}],"quality_controlled":"1","language":[{"iso":"eng"}],"series_title":"Sheet Metal 2025","doi":"10.21741/9781644903551-13","author":[{"first_name":"Stephan","last_name":"Lüder","full_name":"Lüder, Stephan"},{"id":"44935","first_name":"Pia Katharina","last_name":"Holtkamp","full_name":"Holtkamp, Pia Katharina"},{"first_name":"Simon","last_name":"Wituschek","full_name":"Wituschek, Simon"},{"id":"7850","first_name":"Mathias","last_name":"Bobbert","full_name":"Bobbert, Mathias"},{"last_name":"Meschut","first_name":"Gerson","orcid":"0000-0002-2763-1246","full_name":"Meschut, Gerson","id":"32056"},{"last_name":"Lechner","first_name":"Michael","full_name":"Lechner, Michael"},{"full_name":"Schmale, Hans Christian","last_name":"Schmale","first_name":"Hans Christian"}],"publication_identifier":{"issn":["2474-395X"]},"year":"2025","title":"Analysis of the binding mechanisms depending on versatile process variants of self-piercing riveting","intvolume":" 52","publication_status":"published","date_updated":"2026-05-12T12:12:36Z","date_created":"2025-06-20T10:13:22Z","department":[{"_id":"630"},{"_id":"43"},{"_id":"157"}],"type":"conference","keyword":["Joining","Self-Piercing Riveting","Sheet Metal"],"publication":"Materials Research Proceedings","extern":"1","abstract":[{"lang":"eng","text":"The constantly increasing demand for climate protection and resource conservation requires innovative and versatile joining processes that improve adaptability to the joining task and robustness to enable flexible manufacturing on a production line. Therefore, the versatile SPR (V-SPR) and tumbling SPR (T-SPR) were developed. Using the example of a mixed material combination HCT590X+Z (t0 = 1.0 mm) / EN AW-6014 T4 (t0 = 2.0 mm), these processes were examined and compared with regard to the binding mechanisms form closure and force closure using micrographs, non-destructive resistance measurements and destructive torsion tests. For this purpose, a new sample geometry was defined, and the methods were adapted to the SPR process variants."}]},{"date_created":"2024-02-07T07:23:23Z","type":"journal_article","keyword":["Applied Mathematics","Computational Mathematics","Control and Optimization"],"department":[{"_id":"101"}],"publication":"Computational Optimization and Applications","citation":{"mla":"Gebken, Bennet. “A Note on the Convergence of Deterministic Gradient Sampling in Nonsmooth Optimization.” Computational Optimization and Applications, Springer Science and Business Media LLC, 2024, doi:10.1007/s10589-024-00552-0.","ama":"Gebken B. A note on the convergence of deterministic gradient sampling in nonsmooth optimization. Computational Optimization and Applications. Published online 2024. doi:10.1007/s10589-024-00552-0","bibtex":"@article{Gebken_2024, title={A note on the convergence of deterministic gradient sampling in nonsmooth optimization}, DOI={10.1007/s10589-024-00552-0}, journal={Computational Optimization and Applications}, publisher={Springer Science and Business Media LLC}, author={Gebken, Bennet}, year={2024} }","apa":"Gebken, B. (2024). A note on the convergence of deterministic gradient sampling in nonsmooth optimization. Computational Optimization and Applications. https://doi.org/10.1007/s10589-024-00552-0","ieee":"B. Gebken, “A note on the convergence of deterministic gradient sampling in nonsmooth optimization,” Computational Optimization and Applications, 2024, doi: 10.1007/s10589-024-00552-0.","short":"B. Gebken, Computational Optimization and Applications (2024).","chicago":"Gebken, Bennet. “A Note on the Convergence of Deterministic Gradient Sampling in Nonsmooth Optimization.” Computational Optimization and Applications, 2024. https://doi.org/10.1007/s10589-024-00552-0."},"abstract":[{"lang":"eng","text":"AbstractApproximation of subdifferentials is one of the main tasks when computing descent directions for nonsmooth optimization problems. In this article, we propose a bisection method for weakly lower semismooth functions which is able to compute new subgradients that improve a given approximation in case a direction with insufficient descent was computed. Combined with a recently proposed deterministic gradient sampling approach, this yields a deterministic and provably convergent way to approximate subdifferentials for computing descent directions."}],"language":[{"iso":"eng"}],"_id":"51208","publisher":"Springer Science and Business Media LLC","doi":"10.1007/s10589-024-00552-0","user_id":"32643","year":"2024","status":"public","title":"A note on the convergence of deterministic gradient sampling in nonsmooth optimization","publication_identifier":{"issn":["0926-6003","1573-2894"]},"author":[{"id":"32643","full_name":"Gebken, Bennet","last_name":"Gebken","first_name":"Bennet"}],"date_updated":"2024-02-08T08:05:54Z","publication_status":"published"},{"status":"public","user_id":"9557","volume":13,"_id":"51518","funded_apc":"1","publisher":"MDPI AG","quality_controlled":"1","citation":{"bibtex":"@article{Aimiyekagbon_Bender_Hemsel_Sextro_2024, title={Diagnostics of Piezoelectric Bending Actuators Subjected to Varying Operating Conditions}, volume={13}, DOI={10.3390/electronics13030521}, number={3521}, journal={Electronics}, publisher={MDPI AG}, author={Aimiyekagbon, Osarenren Kennedy and Bender, Amelie and Hemsel, Tobias and Sextro, Walter}, year={2024} }","ama":"Aimiyekagbon OK, Bender A, Hemsel T, Sextro W. Diagnostics of Piezoelectric Bending Actuators Subjected to Varying Operating Conditions. Electronics. 2024;13(3). doi:10.3390/electronics13030521","mla":"Aimiyekagbon, Osarenren Kennedy, et al. “Diagnostics of Piezoelectric Bending Actuators Subjected to Varying Operating Conditions.” Electronics, vol. 13, no. 3, 521, MDPI AG, 2024, doi:10.3390/electronics13030521.","short":"O.K. Aimiyekagbon, A. Bender, T. Hemsel, W. Sextro, Electronics 13 (2024).","chicago":"Aimiyekagbon, Osarenren Kennedy, Amelie Bender, Tobias Hemsel, and Walter Sextro. “Diagnostics of Piezoelectric Bending Actuators Subjected to Varying Operating Conditions.” Electronics 13, no. 3 (2024). https://doi.org/10.3390/electronics13030521.","ieee":"O. K. Aimiyekagbon, A. Bender, T. Hemsel, and W. Sextro, “Diagnostics of Piezoelectric Bending Actuators Subjected to Varying Operating Conditions,” Electronics, vol. 13, no. 3, Art. no. 521, 2024, doi: 10.3390/electronics13030521.","apa":"Aimiyekagbon, O. K., Bender, A., Hemsel, T., & Sextro, W. (2024). Diagnostics of Piezoelectric Bending Actuators Subjected to Varying Operating Conditions. Electronics, 13(3), Article 521. https://doi.org/10.3390/electronics13030521"},"date_updated":"2024-03-15T16:15:56Z","publication_status":"published","intvolume":" 13","article_type":"original","year":"2024","title":"Diagnostics of Piezoelectric Bending Actuators Subjected to Varying Operating Conditions","author":[{"last_name":"Aimiyekagbon","first_name":"Osarenren Kennedy","full_name":"Aimiyekagbon, Osarenren Kennedy","id":"9557"},{"full_name":"Bender, Amelie","first_name":"Amelie","last_name":"Bender","id":"54290"},{"id":"210","full_name":"Hemsel, Tobias","first_name":"Tobias","last_name":"Hemsel"},{"id":"21220","last_name":"Sextro","first_name":"Walter","full_name":"Sextro, Walter"}],"publication_identifier":{"issn":["2079-9292"]},"doi":"10.3390/electronics13030521","article_number":"521","language":[{"iso":"eng"}],"abstract":[{"lang":"eng","text":"In applications of piezoelectric actuators and sensors, the dependability and particularly the reliability throughout their lifetime are vital to manufacturers and end-users and are enabled through condition-monitoring approaches. Existing approaches often utilize impedance measurements over a range of frequencies or velocity measurements and require additional equipment or sensors, such as a laser Doppler vibrometer. Furthermore, the non-negligible effects of varying operating conditions are often unconsidered. To minimize the need for additional sensors while maintaining the dependability of piezoelectric bending actuators irrespective of varying operating conditions, an online diagnostics approach is proposed. To this end, time- and frequency-domain features are extracted from monitored current signals to reflect hairline crack development in bending actuators. For validation of applicability, the presented analysis method was evaluated on piezoelectric bending actuators subjected to accelerated lifetime tests at varying voltage amplitudes and under external damping conditions. In the presence of a crack and due to a diminished stiffness, the resonance frequency decreases and the root-mean-square amplitude of the current signal simultaneously abruptly drops during the lifetime tests. Furthermore, the piezoelectric crack surfaces clapping is reflected in higher harmonics of the current signal. Thus, time-domain features and harmonics of the current signals are sufficient to diagnose hairline cracks in the actuators."}],"issue":"3","publication":"Electronics","keyword":["piezoelectric transducer","self-sensing","fault detection","diagnostics","hairline crack","condition monitoring"],"type":"journal_article","department":[{"_id":"151"}],"date_created":"2024-02-20T06:46:43Z"},{"has_accepted_license":"1","status":"public","ddc":["510"],"user_id":"97359","volume":12,"publisher":"Oxford University Press (OUP)","_id":"52726","file_date_updated":"2024-03-22T09:06:07Z","citation":{"ieee":"C. Bick and S. von der Gracht, “Heteroclinic dynamics in network dynamical systems with higher-order interactions,” Journal of Complex Networks, vol. 12, no. 2, 2024, doi: 10.1093/comnet/cnae009.","apa":"Bick, C., & von der Gracht, S. (2024). Heteroclinic dynamics in network dynamical systems with higher-order interactions. Journal of Complex Networks, 12(2). https://doi.org/10.1093/comnet/cnae009","short":"C. Bick, S. von der Gracht, Journal of Complex Networks 12 (2024).","chicago":"Bick, Christian, and Sören von der Gracht. “Heteroclinic Dynamics in Network Dynamical Systems with Higher-Order Interactions.” Journal of Complex Networks 12, no. 2 (2024). https://doi.org/10.1093/comnet/cnae009.","mla":"Bick, Christian, and Sören von der Gracht. “Heteroclinic Dynamics in Network Dynamical Systems with Higher-Order Interactions.” Journal of Complex Networks, vol. 12, no. 2, Oxford University Press (OUP), 2024, doi:10.1093/comnet/cnae009.","bibtex":"@article{Bick_von der Gracht_2024, title={Heteroclinic dynamics in network dynamical systems with higher-order interactions}, volume={12}, DOI={10.1093/comnet/cnae009}, number={2}, journal={Journal of Complex Networks}, publisher={Oxford University Press (OUP)}, author={Bick, Christian and von der Gracht, Sören}, year={2024} }","ama":"Bick C, von der Gracht S. Heteroclinic dynamics in network dynamical systems with higher-order interactions. Journal of Complex Networks. 2024;12(2). doi:10.1093/comnet/cnae009"},"oa":"1","external_id":{"arxiv":["2309.02006"]},"date_updated":"2024-03-22T09:11:53Z","publication_status":"published","intvolume":" 12","article_type":"original","year":"2024","title":"Heteroclinic dynamics in network dynamical systems with higher-order interactions","publication_identifier":{"issn":["2051-1329"]},"author":[{"first_name":"Christian","last_name":"Bick","full_name":"Bick, Christian"},{"id":"97359","full_name":"von der Gracht, Sören","orcid":"0000-0002-8054-2058","first_name":"Sören","last_name":"von der Gracht"}],"doi":"10.1093/comnet/cnae009","main_file_link":[{"open_access":"1","url":"https://academic.oup.com/comnet/article-pdf/12/2/cnae009/56832119/cnae009.pdf"}],"language":[{"iso":"eng"}],"abstract":[{"text":"Heteroclinic structures organize global features of dynamical systems. We analyse whether heteroclinic structures can arise in network dynamics with higher-order interactions which describe the nonlinear interactions between three or more units. We find that while commonly analysed model equations such as network dynamics on undirected hypergraphs may be useful to describe local dynamics such as cluster synchronization, they give rise to obstructions that allow to design of heteroclinic structures in phase space. By contrast, directed hypergraphs break the homogeneity and lead to vector fields that support heteroclinic structures.","lang":"eng"}],"publication":"Journal of Complex Networks","issue":"2","keyword":["Applied Mathematics","Computational Mathematics","Control and Optimization","Management Science and Operations Research","Computer Networks and Communications"],"type":"journal_article","department":[{"_id":"101"}],"file":[{"date_created":"2024-03-22T09:06:07Z","creator":"svdg","file_id":"52728","content_type":"application/pdf","success":1,"file_name":"heteroclinic-dynamics-in-network-dynamical-systems-with-higher-order-interactions.pdf","access_level":"closed","file_size":649155,"relation":"main_file","date_updated":"2024-03-22T09:06:07Z"}],"date_created":"2024-03-22T09:04:57Z"},{"citation":{"ieee":"R. P. Prager and H. Trautmann, “Exploratory Landscape Analysis for Mixed-Variable Problems,” IEEE Transactions on Evolutionary Computation, pp. 1–1, 2024, doi: 10.1109/TEVC.2024.3399560.","apa":"Prager, R. P., & Trautmann, H. (2024). Exploratory Landscape Analysis for Mixed-Variable Problems. IEEE Transactions on Evolutionary Computation, 1–1. https://doi.org/10.1109/TEVC.2024.3399560","chicago":"Prager, Raphael Patrick, and Heike Trautmann. “Exploratory Landscape Analysis for Mixed-Variable Problems.” IEEE Transactions on Evolutionary Computation, 2024, 1–1. https://doi.org/10.1109/TEVC.2024.3399560.","short":"R.P. Prager, H. Trautmann, IEEE Transactions on Evolutionary Computation (2024) 1–1.","mla":"Prager, Raphael Patrick, and Heike Trautmann. “Exploratory Landscape Analysis for Mixed-Variable Problems.” IEEE Transactions on Evolutionary Computation, 2024, pp. 1–1, doi:10.1109/TEVC.2024.3399560.","bibtex":"@article{Prager_Trautmann_2024, title={Exploratory Landscape Analysis for Mixed-Variable Problems}, DOI={10.1109/TEVC.2024.3399560}, journal={IEEE Transactions on Evolutionary Computation}, author={Prager, Raphael Patrick and Trautmann, Heike}, year={2024}, pages={1–1} }","ama":"Prager RP, Trautmann H. Exploratory Landscape Analysis for Mixed-Variable Problems. IEEE Transactions on Evolutionary Computation. Published online 2024:1-1. doi:10.1109/TEVC.2024.3399560"},"publication":"IEEE Transactions on Evolutionary Computation","date_created":"2024-06-03T06:16:33Z","department":[{"_id":"819"}],"type":"journal_article","keyword":["Optimization","Evolutionary computation","Benchmark testing","Hyperparameter optimization","Portfolios","Extraterrestrial measurements","Dispersion","Exploratory landscape analysis","mixed-variable problem","mixed search spaces","automated algorithm selection"],"author":[{"full_name":"Prager, Raphael Patrick","last_name":"Prager","first_name":"Raphael Patrick"},{"last_name":"Trautmann","orcid":"0000-0002-9788-8282","first_name":"Heike","full_name":"Trautmann, Heike","id":"100740"}],"year":"2024","status":"public","title":"Exploratory Landscape Analysis for Mixed-Variable Problems","date_updated":"2024-06-03T06:17:13Z","language":[{"iso":"eng"}],"_id":"54548","page":"1-1","user_id":"15504","doi":"10.1109/TEVC.2024.3399560"},{"status":"public","volume":34,"user_id":"56399","publisher":"Society for Industrial and Applied Mathematics","_id":"32447","page":"2259 - 2286","citation":{"bibtex":"@article{Sonntag_Peitz_2024, title={Fast Convergence of Inertial Multiobjective Gradient-Like Systems with Asymptotic Vanishing Damping}, volume={34}, DOI={10.1137/23M1588512}, number={3}, journal={SIAM Journal on Optimization}, publisher={Society for Industrial and Applied Mathematics}, author={Sonntag, Konstantin and Peitz, Sebastian}, year={2024}, pages={2259–2286} }","chicago":"Sonntag, Konstantin, and Sebastian Peitz. “Fast Convergence of Inertial Multiobjective Gradient-Like Systems with Asymptotic Vanishing Damping.” SIAM Journal on Optimization 34, no. 3 (2024): 2259–86. https://doi.org/10.1137/23M1588512.","short":"K. Sonntag, S. Peitz, SIAM Journal on Optimization 34 (2024) 2259–2286.","ama":"Sonntag K, Peitz S. Fast Convergence of Inertial Multiobjective Gradient-Like Systems with Asymptotic Vanishing Damping. SIAM Journal on Optimization. 2024;34(3):2259-2286. doi:10.1137/23M1588512","ieee":"K. Sonntag and S. Peitz, “Fast Convergence of Inertial Multiobjective Gradient-Like Systems with Asymptotic Vanishing Damping,” SIAM Journal on Optimization, vol. 34, no. 3, pp. 2259–2286, 2024, doi: 10.1137/23M1588512.","apa":"Sonntag, K., & Peitz, S. (2024). Fast Convergence of Inertial Multiobjective Gradient-Like Systems with Asymptotic Vanishing Damping. SIAM Journal on Optimization, 34(3), 2259–2286. https://doi.org/10.1137/23M1588512","mla":"Sonntag, Konstantin, and Sebastian Peitz. “Fast Convergence of Inertial Multiobjective Gradient-Like Systems with Asymptotic Vanishing Damping.” SIAM Journal on Optimization, vol. 34, no. 3, Society for Industrial and Applied Mathematics, 2024, pp. 2259–86, doi:10.1137/23M1588512."},"article_type":"original","intvolume":" 34","publication_status":"published","date_updated":"2024-07-02T09:27:39Z","publication_identifier":{"issn":["1095-7189"]},"author":[{"id":"56399","orcid":"https://orcid.org/0000-0003-3384-3496","last_name":"Sonntag","first_name":"Konstantin","full_name":"Sonntag, Konstantin"},{"full_name":"Peitz, Sebastian","orcid":"0000-0002-3389-793X","last_name":"Peitz","first_name":"Sebastian","id":"47427"}],"year":"2024","title":"Fast Convergence of Inertial Multiobjective Gradient-Like Systems with Asymptotic Vanishing Damping","doi":"10.1137/23M1588512","language":[{"iso":"eng"}],"abstract":[{"text":"We present a new gradient-like dynamical system related to unconstrained convex smooth multiobjective optimization which involves inertial effects and asymptotic vanishing damping. To the best of our knowledge, this system is the first inertial gradient-like system for multiobjective optimization problems including asymptotic vanishing damping, expanding the ideas previously laid out in [H. Attouch and G. Garrigos, Multiobjective Optimization: An Inertial Dynamical Approach to Pareto Optima, preprint, arXiv:1506.02823, 2015]. We prove existence of solutions to this system in finite dimensions and further prove that its bounded solutions converge weakly to weakly Pareto optimal points. In addition, we obtain a convergence rate of order \\(\\mathcal{O}(t^{-2})\\) for the function values measured with a merit function. This approach presents a good basis for the development of fast gradient methods for multiobjective optimization.","lang":"eng"}],"issue":"3","publication":"SIAM Journal on Optimization","department":[{"_id":"101"},{"_id":"655"}],"keyword":["multiobjective optimization","Pareto optimization","Lyapunov analysis","gradient-likedynamical systems","inertial dynamics","asymptotic vanishing damping","fast convergence"],"type":"journal_article","date_created":"2022-07-28T11:53:02Z"},{"type":"journal_article","keyword":["Optimization","Evolutionary computation","Approximation algorithms","Benchmark testing","Vectors","Surveys","Pareto optimization","multi-objective optimization","evolutionary computation","multimodal optimization","local solutions"],"date_created":"2024-09-24T08:01:14Z","publication":"IEEE Transactions on Evolutionary Computation","citation":{"chicago":"Rodriguez-Fernandez, Angel E., Lennart Schäpermeier, Carlos Hernández, Pascal Kerschke, Heike Trautmann, and Oliver Schütze. “Finding ϵ-Locally Optimal Solutions for Multi-Objective Multimodal Optimization.” IEEE Transactions on Evolutionary Computation, 2024, 1–1. https://doi.org/10.1109/TEVC.2024.3458855.","short":"A.E. Rodriguez-Fernandez, L. Schäpermeier, C. Hernández, P. Kerschke, H. Trautmann, O. Schütze, IEEE Transactions on Evolutionary Computation (2024) 1–1.","apa":"Rodriguez-Fernandez, A. E., Schäpermeier, L., Hernández, C., Kerschke, P., Trautmann, H., & Schütze, O. (2024). Finding ϵ-Locally Optimal Solutions for Multi-Objective Multimodal Optimization. IEEE Transactions on Evolutionary Computation, 1–1. https://doi.org/10.1109/TEVC.2024.3458855","ieee":"A. E. Rodriguez-Fernandez, L. Schäpermeier, C. Hernández, P. Kerschke, H. Trautmann, and O. Schütze, “Finding ϵ-Locally Optimal Solutions for Multi-Objective Multimodal Optimization,” IEEE Transactions on Evolutionary Computation, pp. 1–1, 2024, doi: 10.1109/TEVC.2024.3458855.","ama":"Rodriguez-Fernandez AE, Schäpermeier L, Hernández C, Kerschke P, Trautmann H, Schütze O. Finding ϵ-Locally Optimal Solutions for Multi-Objective Multimodal Optimization. IEEE Transactions on Evolutionary Computation. Published online 2024:1-1. doi:10.1109/TEVC.2024.3458855","bibtex":"@article{Rodriguez-Fernandez_Schäpermeier_Hernández_Kerschke_Trautmann_Schütze_2024, title={Finding ϵ-Locally Optimal Solutions for Multi-Objective Multimodal Optimization}, DOI={10.1109/TEVC.2024.3458855}, journal={IEEE Transactions on Evolutionary Computation}, author={Rodriguez-Fernandez, Angel E. and Schäpermeier, Lennart and Hernández, Carlos and Kerschke, Pascal and Trautmann, Heike and Schütze, Oliver}, year={2024}, pages={1–1} }","mla":"Rodriguez-Fernandez, Angel E., et al. “Finding ϵ-Locally Optimal Solutions for Multi-Objective Multimodal Optimization.” IEEE Transactions on Evolutionary Computation, 2024, pp. 1–1, doi:10.1109/TEVC.2024.3458855."},"user_id":"15504","doi":"10.1109/TEVC.2024.3458855","page":"1-1","_id":"56221","language":[{"iso":"eng"}],"date_updated":"2024-09-24T08:01:47Z","status":"public","year":"2024","title":"Finding ϵ-Locally Optimal Solutions for Multi-Objective Multimodal Optimization","author":[{"first_name":"Angel E.","last_name":"Rodriguez-Fernandez","full_name":"Rodriguez-Fernandez, Angel E."},{"last_name":"Schäpermeier","first_name":"Lennart","full_name":"Schäpermeier, Lennart"},{"full_name":"Hernández, Carlos","last_name":"Hernández","first_name":"Carlos"},{"full_name":"Kerschke, Pascal","first_name":"Pascal","last_name":"Kerschke"},{"full_name":"Trautmann, Heike","orcid":"0000-0002-9788-8282","last_name":"Trautmann","first_name":"Heike","id":"100740"},{"first_name":"Oliver","last_name":"Schütze","full_name":"Schütze, Oliver"}]},{"type":"conference","keyword":["MOSFET","Thermal resistance","Surface resistance","Bridge circuits","Zero voltage switching","Pareto optimization","Capacitance","Numerical simulation","Optimization","Resistance heating","Pareto Optimization","Dual-Active Bridge","ZVS","Inductor Optimization","Transformer Optimization","Heat Sink Optimization"],"department":[{"_id":"52"}],"date_created":"2026-01-06T08:06:24Z","publication":"2024 IEEE Design Methodologies Conference (DMC)","citation":{"chicago":"Förster, Nikolas, Oliver Wallscheid, and Frank Schafmeister. “Dual-Active Bridge Sequential Pareto Optimization for Fast Pre-Design and Final Component Selection.” In 2024 IEEE Design Methodologies Conference (DMC), 1–8, 2024. https://doi.org/10.1109/DMC62632.2024.10812131.","short":"N. Förster, O. Wallscheid, F. Schafmeister, in: 2024 IEEE Design Methodologies Conference (DMC), 2024, pp. 1–8.","ieee":"N. Förster, O. Wallscheid, and F. Schafmeister, “Dual-Active Bridge Sequential Pareto Optimization for Fast Pre-Design and Final Component Selection,” in 2024 IEEE Design Methodologies Conference (DMC), 2024, pp. 1–8, doi: 10.1109/DMC62632.2024.10812131.","apa":"Förster, N., Wallscheid, O., & Schafmeister, F. (2024). Dual-Active Bridge Sequential Pareto Optimization for Fast Pre-Design and Final Component Selection. 2024 IEEE Design Methodologies Conference (DMC), 1–8. https://doi.org/10.1109/DMC62632.2024.10812131","bibtex":"@inproceedings{Förster_Wallscheid_Schafmeister_2024, title={Dual-Active Bridge Sequential Pareto Optimization for Fast Pre-Design and Final Component Selection}, DOI={10.1109/DMC62632.2024.10812131}, booktitle={2024 IEEE Design Methodologies Conference (DMC)}, author={Förster, Nikolas and Wallscheid, Oliver and Schafmeister, Frank}, year={2024}, pages={1–8} }","ama":"Förster N, Wallscheid O, Schafmeister F. Dual-Active Bridge Sequential Pareto Optimization for Fast Pre-Design and Final Component Selection. In: 2024 IEEE Design Methodologies Conference (DMC). ; 2024:1-8. doi:10.1109/DMC62632.2024.10812131","mla":"Förster, Nikolas, et al. “Dual-Active Bridge Sequential Pareto Optimization for Fast Pre-Design and Final Component Selection.” 2024 IEEE Design Methodologies Conference (DMC), 2024, pp. 1–8, doi:10.1109/DMC62632.2024.10812131."},"doi":"10.1109/DMC62632.2024.10812131","user_id":"83383","page":"1-8","language":[{"iso":"eng"}],"_id":"63497","date_updated":"2026-01-06T08:07:50Z","year":"2024","status":"public","title":"Dual-Active Bridge Sequential Pareto Optimization for Fast Pre-Design and Final Component Selection","author":[{"full_name":"Förster, Nikolas","last_name":"Förster","first_name":"Nikolas"},{"full_name":"Wallscheid, Oliver","last_name":"Wallscheid","first_name":"Oliver"},{"full_name":"Schafmeister, Frank","first_name":"Frank","last_name":"Schafmeister"}]}]