---
_id: '50299'
abstract:
- lang: eng
text: "A finite classical polar space of rank $n$ consists of the totally isotropic\r\nsubspaces
of a finite vector space over $\\mathbb{F}_q$ equipped with a\r\nnondegenerate
form such that $n$ is the maximal dimension of such a subspace. A\r\n$t$-$(n,k,\\lambda)$
design in a finite classical polar space of rank $n$ is a\r\ncollection $Y$ of
totally isotropic $k$-spaces such that each totally isotropic\r\n$t$-space is
contained in exactly $\\lambda$ members of $Y$. Nontrivial examples\r\nare currently
only known for $t\\leq 2$. We show that $t$-$(n,k,\\lambda)$\r\ndesigns in polar
spaces exist for all $t$ and $q$ provided that\r\n$k>\\frac{21}{2}t$ and $n$ is
sufficiently large enough. The proof is based on a\r\nprobabilistic method by
Kuperberg, Lovett, and Peled, and it is thus\r\nnonconstructive."
author:
- first_name: Charlene
full_name: Weiß, Charlene
id: '70420'
last_name: Weiß
citation:
ama: Weiß C. Nontrivial $t$-designs in polar spaces exist for all $t$. Des Codes
Cryptogr. 2025;93:971-981. doi:10.1007/s10623-024-01471-1
apa: Weiß, C. (2025). Nontrivial $t$-designs in polar spaces exist for all $t$.
Des. Codes Cryptogr., 93, 971–981. https://doi.org/10.1007/s10623-024-01471-1
bibtex: '@article{Weiß_2025, title={Nontrivial $t$-designs in polar spaces exist
for all $t$}, volume={93}, DOI={10.1007/s10623-024-01471-1},
journal={Des. Codes Cryptogr.}, author={Weiß, Charlene}, year={2025}, pages={971–981}
}'
chicago: 'Weiß, Charlene. “Nontrivial $t$-Designs in Polar Spaces Exist for All
$t$.” Des. Codes Cryptogr. 93 (2025): 971–81. https://doi.org/10.1007/s10623-024-01471-1.'
ieee: 'C. Weiß, “Nontrivial $t$-designs in polar spaces exist for all $t$,” Des.
Codes Cryptogr., vol. 93, pp. 971–981, 2025, doi: 10.1007/s10623-024-01471-1.'
mla: Weiß, Charlene. “Nontrivial $t$-Designs in Polar Spaces Exist for All $t$.”
Des. Codes Cryptogr., vol. 93, 2025, pp. 971–81, doi:10.1007/s10623-024-01471-1.
short: C. Weiß, Des. Codes Cryptogr. 93 (2025) 971–981.
date_created: 2024-01-08T14:39:54Z
date_updated: 2026-02-25T13:51:50Z
department:
- _id: '100'
doi: 10.1007/s10623-024-01471-1
intvolume: ' 93'
language:
- iso: eng
page: 971 - 981
publication: Des. Codes Cryptogr.
publication_status: published
status: public
title: Nontrivial $t$-designs in polar spaces exist for all $t$
type: journal_article
user_id: '70420'
volume: 93
year: '2025'
...
---
_id: '64292'
author:
- first_name: M.
full_name: Lindemann, M.
last_name: Lindemann
- first_name: M.
full_name: D’Alessandro, M.
last_name: D’Alessandro
- first_name: N.
full_name: Ledentsov, N.
last_name: Ledentsov
- first_name: O. Y.
full_name: Makarov, O. Y.
last_name: Makarov
- first_name: N. N.
full_name: Ledentsov, N. N.
last_name: Ledentsov
- first_name: A.
full_name: Tibaldi, A.
last_name: Tibaldi
- first_name: N. C.
full_name: Gerhardt, N. C.
last_name: Gerhardt
- first_name: M. R.
full_name: Hofmann, M. R.
last_name: Hofmann
citation:
ama: Lindemann M, D’Alessandro M, Ledentsov N, et al. Laterally coupled vertical-cavity
surface-emitting lasers with tunable resonance width and frequency. Journal
of Applied Physics. 2025;138(5). doi:10.1063/5.0275622
apa: Lindemann, M., D’Alessandro, M., Ledentsov, N., Makarov, O. Y., Ledentsov,
N. N., Tibaldi, A., Gerhardt, N. C., & Hofmann, M. R. (2025). Laterally coupled
vertical-cavity surface-emitting lasers with tunable resonance width and frequency.
Journal of Applied Physics, 138(5). https://doi.org/10.1063/5.0275622
bibtex: '@article{Lindemann_D’Alessandro_Ledentsov_Makarov_Ledentsov_Tibaldi_Gerhardt_Hofmann_2025,
title={Laterally coupled vertical-cavity surface-emitting lasers with tunable
resonance width and frequency}, volume={138}, DOI={10.1063/5.0275622},
number={5}, journal={Journal of Applied Physics}, publisher={AIP Publishing},
author={Lindemann, M. and D’Alessandro, M. and Ledentsov, N. and Makarov, O. Y.
and Ledentsov, N. N. and Tibaldi, A. and Gerhardt, N. C. and Hofmann, M. R.},
year={2025} }'
chicago: Lindemann, M., M. D’Alessandro, N. Ledentsov, O. Y. Makarov, N. N. Ledentsov,
A. Tibaldi, N. C. Gerhardt, and M. R. Hofmann. “Laterally Coupled Vertical-Cavity
Surface-Emitting Lasers with Tunable Resonance Width and Frequency.” Journal
of Applied Physics 138, no. 5 (2025). https://doi.org/10.1063/5.0275622.
ieee: 'M. Lindemann et al., “Laterally coupled vertical-cavity surface-emitting
lasers with tunable resonance width and frequency,” Journal of Applied Physics,
vol. 138, no. 5, 2025, doi: 10.1063/5.0275622.'
mla: Lindemann, M., et al. “Laterally Coupled Vertical-Cavity Surface-Emitting Lasers
with Tunable Resonance Width and Frequency.” Journal of Applied Physics,
vol. 138, no. 5, AIP Publishing, 2025, doi:10.1063/5.0275622.
short: M. Lindemann, M. D’Alessandro, N. Ledentsov, O.Y. Makarov, N.N. Ledentsov,
A. Tibaldi, N.C. Gerhardt, M.R. Hofmann, Journal of Applied Physics 138 (2025).
date_created: 2026-02-20T10:03:50Z
date_updated: 2026-02-25T13:59:32Z
department:
- _id: '977'
doi: 10.1063/5.0275622
intvolume: ' 138'
issue: '5'
publication: Journal of Applied Physics
publication_identifier:
issn:
- 1089-7550
publisher: AIP Publishing
status: public
title: Laterally coupled vertical-cavity surface-emitting lasers with tunable resonance
width and frequency
type: journal_article
user_id: '15911'
volume: 138
year: '2025'
...
---
_id: '61918'
author:
- first_name: Jeroen
full_name: Rook, Jeroen
id: '102977'
last_name: Rook
- first_name: Quentin
full_name: Renau, Quentin
last_name: Renau
- first_name: Heike
full_name: Trautmann, Heike
id: '100740'
last_name: Trautmann
orcid: 0000-0002-9788-8282
- first_name: Emma
full_name: Hart, Emma
last_name: Hart
citation:
ama: 'Rook J, Renau Q, Trautmann H, Hart E. Efficient Online Automated Algorithm
Selection in the Face of Data-Drift in Optimisation Problem Instances. In: Proceedings
of the 18th ACM/SIGEVO Conference on Foundations of Genetic Algorithms, FOGA 2025,
Leiden, The Netherlands, August 27-29, 2025. ACM; 2025:262–272. doi:10.1145/3729878.3746615'
apa: Rook, J., Renau, Q., Trautmann, H., & Hart, E. (2025). Efficient Online
Automated Algorithm Selection in the Face of Data-Drift in Optimisation Problem
Instances. Proceedings of the 18th ACM/SIGEVO Conference on Foundations of
Genetic Algorithms, FOGA 2025, Leiden, The Netherlands, August 27-29, 2025,
262–272. https://doi.org/10.1145/3729878.3746615
bibtex: '@inproceedings{Rook_Renau_Trautmann_Hart_2025, title={Efficient Online
Automated Algorithm Selection in the Face of Data-Drift in Optimisation Problem
Instances}, DOI={10.1145/3729878.3746615},
booktitle={Proceedings of the 18th ACM/SIGEVO Conference on Foundations of Genetic
Algorithms, FOGA 2025, Leiden, The Netherlands, August 27-29, 2025}, publisher={ACM},
author={Rook, Jeroen and Renau, Quentin and Trautmann, Heike and Hart, Emma},
year={2025}, pages={262–272} }'
chicago: Rook, Jeroen, Quentin Renau, Heike Trautmann, and Emma Hart. “Efficient
Online Automated Algorithm Selection in the Face of Data-Drift in Optimisation
Problem Instances.” In Proceedings of the 18th ACM/SIGEVO Conference on Foundations
of Genetic Algorithms, FOGA 2025, Leiden, The Netherlands, August 27-29, 2025,
262–272. ACM, 2025. https://doi.org/10.1145/3729878.3746615.
ieee: 'J. Rook, Q. Renau, H. Trautmann, and E. Hart, “Efficient Online Automated
Algorithm Selection in the Face of Data-Drift in Optimisation Problem Instances,”
in Proceedings of the 18th ACM/SIGEVO Conference on Foundations of Genetic
Algorithms, FOGA 2025, Leiden, The Netherlands, August 27-29, 2025, 2025,
pp. 262–272, doi: 10.1145/3729878.3746615.'
mla: Rook, Jeroen, et al. “Efficient Online Automated Algorithm Selection in the
Face of Data-Drift in Optimisation Problem Instances.” Proceedings of the 18th
ACM/SIGEVO Conference on Foundations of Genetic Algorithms, FOGA 2025, Leiden,
The Netherlands, August 27-29, 2025, ACM, 2025, pp. 262–272, doi:10.1145/3729878.3746615.
short: 'J. Rook, Q. Renau, H. Trautmann, E. Hart, in: Proceedings of the 18th ACM/SIGEVO
Conference on Foundations of Genetic Algorithms, FOGA 2025, Leiden, The Netherlands,
August 27-29, 2025, ACM, 2025, pp. 262–272.'
date_created: 2025-10-22T07:26:45Z
date_updated: 2026-02-25T14:31:18Z
department:
- _id: '819'
doi: 10.1145/3729878.3746615
language:
- iso: eng
page: 262–272
publication: Proceedings of the 18th ACM/SIGEVO Conference on Foundations of Genetic
Algorithms, FOGA 2025, Leiden, The Netherlands, August 27-29, 2025
publisher: ACM
status: public
title: Efficient Online Automated Algorithm Selection in the Face of Data-Drift in
Optimisation Problem Instances
type: conference
user_id: '15504'
year: '2025'
...
---
_id: '64658'
author:
- first_name: Moritz
full_name: Neukötter, Moritz
id: '45530'
last_name: Neukötter
orcid: 0000-0001-9101-8828
- first_name: Steffen
full_name: Jesinghausen, Steffen
id: '3959'
last_name: Jesinghausen
orcid: https://orcid.org/0000-0003-2611-5298
- first_name: Hans-Joachim
full_name: Schmid, Hans-Joachim
id: '464'
last_name: Schmid
orcid: 000-0001-8590-1921
citation:
ama: 'Neukötter M, Jesinghausen S, Schmid H-J. Die Möglichkeiten der Filament Extension
Atomization . In: ; 2025.'
apa: Neukötter, M., Jesinghausen, S., & Schmid, H.-J. (2025). Die Möglichkeiten
der Filament Extension Atomization . Jahrestreffen DECHEMA/VDI-Fachgruppe
Mehrphasenströmung, Hamburg.
bibtex: '@inproceedings{Neukötter_Jesinghausen_Schmid_2025, title={Die Möglichkeiten
der Filament Extension Atomization }, author={Neukötter, Moritz and Jesinghausen,
Steffen and Schmid, Hans-Joachim}, year={2025} }'
chicago: Neukötter, Moritz, Steffen Jesinghausen, and Hans-Joachim Schmid. “Die
Möglichkeiten Der Filament Extension Atomization ,” 2025.
ieee: M. Neukötter, S. Jesinghausen, and H.-J. Schmid, “Die Möglichkeiten der Filament
Extension Atomization ,” presented at the Jahrestreffen DECHEMA/VDI-Fachgruppe
Mehrphasenströmung, Hamburg, 2025.
mla: Neukötter, Moritz, et al. Die Möglichkeiten Der Filament Extension Atomization
. 2025.
short: 'M. Neukötter, S. Jesinghausen, H.-J. Schmid, in: 2025.'
conference:
end_date: 2025-03-21
location: Hamburg
name: Jahrestreffen DECHEMA/VDI-Fachgruppe Mehrphasenströmung
start_date: 2025-03-19
date_created: 2026-02-26T09:00:10Z
date_updated: 2026-02-26T09:05:06Z
department:
- _id: '9'
- _id: '150'
language:
- iso: eng
status: public
title: 'Die Möglichkeiten der Filament Extension Atomization '
type: conference_abstract
user_id: '45530'
year: '2025'
...
---
_id: '64659'
author:
- first_name: Moritz
full_name: Neukötter, Moritz
id: '45530'
last_name: Neukötter
orcid: 0000-0001-9101-8828
- first_name: Steffen
full_name: Jesinghausen, Steffen
id: '3959'
last_name: Jesinghausen
orcid: https://orcid.org/0000-0003-2611-5298
- first_name: Hans-Joachim
full_name: Schmid, Hans-Joachim
id: '464'
last_name: Schmid
orcid: 000-0001-8590-1921
citation:
ama: 'Neukötter M, Jesinghausen S, Schmid H-J. Flow around Particles in Uniaxially
Elongated Capillary Bridges. In: ; 2025.'
apa: Neukötter, M., Jesinghausen, S., & Schmid, H.-J. (2025). Flow around
Particles in Uniaxially Elongated Capillary Bridges. DRG Symposium & Nordic
Rheology Conference, Berlin.
bibtex: '@inproceedings{Neukötter_Jesinghausen_Schmid_2025, title={Flow around Particles
in Uniaxially Elongated Capillary Bridges}, author={Neukötter, Moritz and Jesinghausen,
Steffen and Schmid, Hans-Joachim}, year={2025} }'
chicago: Neukötter, Moritz, Steffen Jesinghausen, and Hans-Joachim Schmid. “Flow
around Particles in Uniaxially Elongated Capillary Bridges,” 2025.
ieee: M. Neukötter, S. Jesinghausen, and H.-J. Schmid, “Flow around Particles in
Uniaxially Elongated Capillary Bridges,” presented at the DRG Symposium &
Nordic Rheology Conference, Berlin, 2025.
mla: Neukötter, Moritz, et al. Flow around Particles in Uniaxially Elongated
Capillary Bridges. 2025.
short: 'M. Neukötter, S. Jesinghausen, H.-J. Schmid, in: 2025.'
conference:
end_date: 2025-06-12
location: Berlin
name: DRG Symposium & Nordic Rheology Conference
start_date: 2025-06-10
date_created: 2026-02-26T09:03:07Z
date_updated: 2026-02-26T09:05:00Z
department:
- _id: '9'
- _id: '150'
language:
- iso: eng
status: public
title: Flow around Particles in Uniaxially Elongated Capillary Bridges
type: conference_abstract
user_id: '45530'
year: '2025'
...
---
_id: '64657'
author:
- first_name: 'Julian '
full_name: 'Neudorf, Julian '
last_name: Neudorf
- first_name: Moritz
full_name: Neukötter, Moritz
id: '45530'
last_name: Neukötter
orcid: 0000-0001-9101-8828
citation:
ama: Neudorf J, Neukötter M. Fließverhalten von unterschiedlichen Fluiden im
Filament Extension Atomizer.; 2025.
apa: Neudorf, J., & Neukötter, M. (2025). Fließverhalten von unterschiedlichen
Fluiden im Filament Extension Atomizer.
bibtex: '@book{Neudorf_Neukötter_2025, title={Fließverhalten von unterschiedlichen
Fluiden im Filament Extension Atomizer}, author={Neudorf, Julian and Neukötter,
Moritz}, year={2025} }'
chicago: Neudorf, Julian , and Moritz Neukötter. Fließverhalten von unterschiedlichen
Fluiden im Filament Extension Atomizer, 2025.
ieee: J. Neudorf and M. Neukötter, Fließverhalten von unterschiedlichen Fluiden
im Filament Extension Atomizer. 2025.
mla: Neudorf, Julian, and Moritz Neukötter. Fließverhalten von unterschiedlichen
Fluiden im Filament Extension Atomizer. 2025.
short: J. Neudorf, M. Neukötter, Fließverhalten von unterschiedlichen Fluiden im
Filament Extension Atomizer, 2025.
date_created: 2026-02-26T08:48:05Z
date_updated: 2026-02-26T08:48:33Z
department:
- _id: '9'
- _id: '150'
language:
- iso: ger
status: public
supervisor:
- first_name: Moritz
full_name: Neukötter, Moritz
id: '45530'
last_name: Neukötter
orcid: 0000-0001-9101-8828
- first_name: Steffen
full_name: Jesinghausen, Steffen
id: '3959'
last_name: Jesinghausen
orcid: https://orcid.org/0000-0003-2611-5298
- first_name: Hans-Joachim
full_name: Schmid, Hans-Joachim
id: '464'
last_name: Schmid
orcid: 000-0001-8590-1921
title: Fließverhalten von unterschiedlichen Fluiden im Filament Extension Atomizer
type: bachelorsthesis
user_id: '45530'
year: '2025'
...
---
_id: '64662'
abstract:
- lang: eng
text: "\r\n In this study, we investigate the impact
of chromium-induced point defects on the nonlinear optical properties and electric-field-induced
second harmonic generation (EFISH) in rutile titanium dioxide (TiO\r\n 2\r\n
\ ). Chromium thin films were deposited by electron beam evaporation
on (001)-oriented bulk TiO\r\n 2\r\n substrates
and subsequently diffused into the lattice in a tube furnace under a nitrogen
atmosphere at 900 °C. The introduction of chromium significantly enhanced the
third harmonic generation (THG) of a 1560 nm laser, with an amplification factor
of up to 8.3, indicative of an enhanced third-order nonlinear susceptibility,\r\n
\ χ\r\n (3)\r\n
\ . Moreover, the application of an external voltage induced
a pronounced EFISH signal in the chromium-doped samples, further confirming the
enhanced nonlinear response. These results demonstrate that defect engineering
via chromium doping in rutile TiO\r\n 2\r\n
\ offers a promising pathway for the development of high-performance
nonlinear optical devices.\r\n "
article_number: '54320'
author:
- first_name: Marius
full_name: Brinkmann, Marius
last_name: Brinkmann
- first_name: Falco
full_name: Meier, Falco
last_name: Meier
- first_name: Vladimir
full_name: Spedt, Vladimir
last_name: Spedt
- first_name: Cedrik
full_name: Meier, Cedrik
id: '20798'
last_name: Meier
orcid: https://orcid.org/0000-0002-3787-3572
citation:
ama: Brinkmann M, Meier F, Spedt V, Meier C. Boosting third-order nonlinearities
in rutile TiO2 by chromium doping. Optics Express. 2025;33(26).
doi:10.1364/oe.572063
apa: Brinkmann, M., Meier, F., Spedt, V., & Meier, C. (2025). Boosting third-order
nonlinearities in rutile TiO2 by chromium doping. Optics Express,
33(26), Article 54320. https://doi.org/10.1364/oe.572063
bibtex: '@article{Brinkmann_Meier_Spedt_Meier_2025, title={Boosting third-order
nonlinearities in rutile TiO2 by chromium doping}, volume={33}, DOI={10.1364/oe.572063}, number={2654320},
journal={Optics Express}, publisher={Optica Publishing Group}, author={Brinkmann,
Marius and Meier, Falco and Spedt, Vladimir and Meier, Cedrik}, year={2025} }'
chicago: Brinkmann, Marius, Falco Meier, Vladimir Spedt, and Cedrik Meier. “Boosting
Third-Order Nonlinearities in Rutile TiO2 by Chromium Doping.” Optics
Express 33, no. 26 (2025). https://doi.org/10.1364/oe.572063.
ieee: 'M. Brinkmann, F. Meier, V. Spedt, and C. Meier, “Boosting third-order nonlinearities
in rutile TiO2 by chromium doping,” Optics Express, vol. 33,
no. 26, Art. no. 54320, 2025, doi: 10.1364/oe.572063.'
mla: Brinkmann, Marius, et al. “Boosting Third-Order Nonlinearities in Rutile TiO2
by Chromium Doping.” Optics Express, vol. 33, no. 26, 54320, Optica Publishing
Group, 2025, doi:10.1364/oe.572063.
short: M. Brinkmann, F. Meier, V. Spedt, C. Meier, Optics Express 33 (2025).
date_created: 2026-02-26T09:43:53Z
date_updated: 2026-02-26T09:44:49Z
department:
- _id: '15'
doi: 10.1364/oe.572063
intvolume: ' 33'
issue: '26'
language:
- iso: eng
publication: Optics Express
publication_identifier:
issn:
- 1094-4087
publication_status: published
publisher: Optica Publishing Group
status: public
title: Boosting third-order nonlinearities in rutile TiO2 by chromium doping
type: journal_article
user_id: '20798'
volume: 33
year: '2025'
...
---
_id: '64720'
author:
- first_name: Carsten
full_name: Schulte, Carsten
last_name: Schulte
- first_name: Sue
full_name: Sentance, Sue
last_name: Sentance
- first_name: Sören
full_name: Sparmann, Sören
last_name: Sparmann
- first_name: Rukiye
full_name: Altin, Rukiye
last_name: Altin
- first_name: Mor
full_name: Friebroon-Yesharim, Mor
last_name: Friebroon-Yesharim
- first_name: Martina
full_name: Landman, Martina
last_name: Landman
- first_name: Michael T.
full_name: Rücker, Michael T.
last_name: Rücker
- first_name: Spruha
full_name: Satavlekar, Spruha
last_name: Satavlekar
- first_name: Angela
full_name: Siegel, Angela
last_name: Siegel
- first_name: Matti
full_name: Tedre, Matti
last_name: Tedre
- first_name: Laura
full_name: Tubino, Laura
last_name: Tubino
- first_name: Henriikka
full_name: Vartiainen, Henriikka
last_name: Vartiainen
- first_name: J. Ángel
full_name: VelÁzquez-Iturbide, J. Ángel
last_name: VelÁzquez-Iturbide
- first_name: Jane
full_name: Waite, Jane
last_name: Waite
- first_name: Zihan
full_name: Wu, Zihan
last_name: Wu
citation:
ama: 'Schulte C, Sentance S, Sparmann S, et al. What We Talk About When We Talk
About K-12 Computing Education. In: 2024 Working Group Reports on Innovation
and Technology in Computer Science Education. ACM; 2025. doi:10.1145/3689187.3709612'
apa: Schulte, C., Sentance, S., Sparmann, S., Altin, R., Friebroon-Yesharim, M.,
Landman, M., Rücker, M. T., Satavlekar, S., Siegel, A., Tedre, M., Tubino, L.,
Vartiainen, H., VelÁzquez-Iturbide, J. Á., Waite, J., & Wu, Z. (2025). What
We Talk About When We Talk About K-12 Computing Education. 2024 Working Group
Reports on Innovation and Technology in Computer Science Education. https://doi.org/10.1145/3689187.3709612
bibtex: '@inproceedings{Schulte_Sentance_Sparmann_Altin_Friebroon-Yesharim_Landman_Rücker_Satavlekar_Siegel_Tedre_et
al._2025, title={What We Talk About When We Talk About K-12 Computing Education},
DOI={10.1145/3689187.3709612},
booktitle={2024 Working Group Reports on Innovation and Technology in Computer
Science Education}, publisher={ACM}, author={Schulte, Carsten and Sentance, Sue
and Sparmann, Sören and Altin, Rukiye and Friebroon-Yesharim, Mor and Landman,
Martina and Rücker, Michael T. and Satavlekar, Spruha and Siegel, Angela and Tedre,
Matti and et al.}, year={2025} }'
chicago: Schulte, Carsten, Sue Sentance, Sören Sparmann, Rukiye Altin, Mor Friebroon-Yesharim,
Martina Landman, Michael T. Rücker, et al. “What We Talk About When We Talk About
K-12 Computing Education.” In 2024 Working Group Reports on Innovation and
Technology in Computer Science Education. ACM, 2025. https://doi.org/10.1145/3689187.3709612.
ieee: 'C. Schulte et al., “What We Talk About When We Talk About K-12 Computing
Education,” 2025, doi: 10.1145/3689187.3709612.'
mla: Schulte, Carsten, et al. “What We Talk About When We Talk About K-12 Computing
Education.” 2024 Working Group Reports on Innovation and Technology in Computer
Science Education, ACM, 2025, doi:10.1145/3689187.3709612.
short: 'C. Schulte, S. Sentance, S. Sparmann, R. Altin, M. Friebroon-Yesharim, M.
Landman, M.T. Rücker, S. Satavlekar, A. Siegel, M. Tedre, L. Tubino, H. Vartiainen,
J.Á. VelÁzquez-Iturbide, J. Waite, Z. Wu, in: 2024 Working Group Reports on Innovation
and Technology in Computer Science Education, ACM, 2025.'
date_created: 2026-02-26T13:00:09Z
date_updated: 2026-02-26T13:02:43Z
doi: 10.1145/3689187.3709612
publication: 2024 Working Group Reports on Innovation and Technology in Computer Science
Education
publication_status: published
publisher: ACM
status: public
title: What We Talk About When We Talk About K-12 Computing Education
type: conference
user_id: '63216'
year: '2025'
...
---
_id: '64719'
author:
- first_name: Sören
full_name: Sparmann, Sören
last_name: Sparmann
- first_name: Rukiye
full_name: Altin, Rukiye
last_name: Altin
- first_name: Andreas
full_name: Mühling, Andreas
last_name: Mühling
- first_name: Carsten
full_name: Schulte, Carsten
last_name: Schulte
citation:
ama: 'Sparmann S, Altin R, Mühling A, Schulte C. Surfacing Educational Traditions
in European K–12 Computing Curricula: A Large-Scale NLP-Based Comparison. In:
Proceedings of the 25th Koli Calling International Conference on Computing
Education Research. ACM; 2025. doi:10.1145/3769994.3770014'
apa: 'Sparmann, S., Altin, R., Mühling, A., & Schulte, C. (2025). Surfacing
Educational Traditions in European K–12 Computing Curricula: A Large-Scale NLP-Based
Comparison. Proceedings of the 25th Koli Calling International Conference on
Computing Education Research. https://doi.org/10.1145/3769994.3770014'
bibtex: '@inproceedings{Sparmann_Altin_Mühling_Schulte_2025, title={Surfacing Educational
Traditions in European K–12 Computing Curricula: A Large-Scale NLP-Based Comparison},
DOI={10.1145/3769994.3770014},
booktitle={Proceedings of the 25th Koli Calling International Conference on Computing
Education Research}, publisher={ACM}, author={Sparmann, Sören and Altin, Rukiye
and Mühling, Andreas and Schulte, Carsten}, year={2025} }'
chicago: 'Sparmann, Sören, Rukiye Altin, Andreas Mühling, and Carsten Schulte. “Surfacing
Educational Traditions in European K–12 Computing Curricula: A Large-Scale NLP-Based
Comparison.” In Proceedings of the 25th Koli Calling International Conference
on Computing Education Research. ACM, 2025. https://doi.org/10.1145/3769994.3770014.'
ieee: 'S. Sparmann, R. Altin, A. Mühling, and C. Schulte, “Surfacing Educational
Traditions in European K–12 Computing Curricula: A Large-Scale NLP-Based Comparison,”
2025, doi: 10.1145/3769994.3770014.'
mla: 'Sparmann, Sören, et al. “Surfacing Educational Traditions in European K–12
Computing Curricula: A Large-Scale NLP-Based Comparison.” Proceedings of the
25th Koli Calling International Conference on Computing Education Research,
ACM, 2025, doi:10.1145/3769994.3770014.'
short: 'S. Sparmann, R. Altin, A. Mühling, C. Schulte, in: Proceedings of the 25th
Koli Calling International Conference on Computing Education Research, ACM, 2025.'
date_created: 2026-02-26T12:59:47Z
date_updated: 2026-02-26T13:02:37Z
doi: 10.1145/3769994.3770014
publication: Proceedings of the 25th Koli Calling International Conference on Computing
Education Research
publication_status: published
publisher: ACM
status: public
title: 'Surfacing Educational Traditions in European K–12 Computing Curricula: A Large-Scale
NLP-Based Comparison'
type: conference
user_id: '63216'
year: '2025'
...
---
_id: '59258'
article_number: '44'
author:
- first_name: Michael
full_name: Winkler, Michael
id: '31496'
last_name: Winkler
citation:
ama: Winkler M. Rough Data in an Evolution System Generalizing 1D Thermoviscoelasticity
with Temperature-Dependent Parameters. Applied Mathematics & Optimization.
2025;91(2). doi:10.1007/s00245-025-10243-9
apa: Winkler, M. (2025). Rough Data in an Evolution System Generalizing 1D Thermoviscoelasticity
with Temperature-Dependent Parameters. Applied Mathematics & Optimization,
91(2), Article 44. https://doi.org/10.1007/s00245-025-10243-9
bibtex: '@article{Winkler_2025, title={Rough Data in an Evolution System Generalizing
1D Thermoviscoelasticity with Temperature-Dependent Parameters}, volume={91},
DOI={10.1007/s00245-025-10243-9},
number={244}, journal={Applied Mathematics & Optimization}, publisher={Springer
Science and Business Media LLC}, author={Winkler, Michael}, year={2025} }'
chicago: Winkler, Michael. “Rough Data in an Evolution System Generalizing 1D Thermoviscoelasticity
with Temperature-Dependent Parameters.” Applied Mathematics & Optimization
91, no. 2 (2025). https://doi.org/10.1007/s00245-025-10243-9.
ieee: 'M. Winkler, “Rough Data in an Evolution System Generalizing 1D Thermoviscoelasticity
with Temperature-Dependent Parameters,” Applied Mathematics & Optimization,
vol. 91, no. 2, Art. no. 44, 2025, doi: 10.1007/s00245-025-10243-9.'
mla: Winkler, Michael. “Rough Data in an Evolution System Generalizing 1D Thermoviscoelasticity
with Temperature-Dependent Parameters.” Applied Mathematics & Optimization,
vol. 91, no. 2, 44, Springer Science and Business Media LLC, 2025, doi:10.1007/s00245-025-10243-9.
short: M. Winkler, Applied Mathematics & Optimization 91 (2025).
date_created: 2025-04-02T11:23:25Z
date_updated: 2026-02-26T15:59:30Z
department:
- _id: '90'
doi: 10.1007/s00245-025-10243-9
intvolume: ' 91'
issue: '2'
language:
- iso: eng
project:
- _id: '245'
name: 'FOR 5208: Modellbasierte Bestimmung nichtlinearer Eigenschaften von Piezokeramiken
für Leistungsschallanwendungen (NEPTUN)'
publication: Applied Mathematics & Optimization
publication_identifier:
issn:
- 0095-4616
- 1432-0606
publication_status: published
publisher: Springer Science and Business Media LLC
status: public
title: Rough Data in an Evolution System Generalizing 1D Thermoviscoelasticity with
Temperature-Dependent Parameters
type: journal_article
user_id: '11829'
volume: 91
year: '2025'
...
---
_id: '64736'
citation:
ama: Frahm J, Glöckner H, Hilgert J, Olafsson G, eds. Special Issue of Journal
of Lie Theory Dedicated to Karl-Hermann Neeb on the Occasion of His 60th Birthday.
Vol 35.; 2025.
apa: Special issue of Journal of Lie Theory dedicated to Karl-Hermann Neeb on the
occasion of his 60th birthday. (2025). In J. Frahm, H. Glöckner, J. Hilgert, &
G. Olafsson (Eds.), J. Lie Theory (Vol. 35, Issue 4).
bibtex: '@book{Frahm_Glöckner_Hilgert_Olafsson_2025, title={Special issue of Journal
of Lie Theory dedicated to Karl-Hermann Neeb on the occasion of his 60th birthday},
volume={35}, number={4}, journal={J. Lie Theory}, year={2025} }'
chicago: Frahm, Jan, Helge Glöckner, Joachim Hilgert, and Gestur Olafsson, eds.
Special Issue of Journal of Lie Theory Dedicated to Karl-Hermann Neeb on the
Occasion of His 60th Birthday. J. Lie Theory. Vol. 35, 2025.
ieee: J. Frahm, H. Glöckner, J. Hilgert, and G. Olafsson, Eds., Special issue
of Journal of Lie Theory dedicated to Karl-Hermann Neeb on the occasion of his
60th birthday, vol. 35, no. 4. 2025.
mla: Frahm, Jan, et al., editors. “Special Issue of Journal of Lie Theory Dedicated
to Karl-Hermann Neeb on the Occasion of His 60th Birthday.” J. Lie Theory,
vol. 35, no. 4, 2025.
short: J. Frahm, H. Glöckner, J. Hilgert, G. Olafsson, eds., Special Issue of Journal
of Lie Theory Dedicated to Karl-Hermann Neeb on the Occasion of His 60th Birthday,
2025.
date_created: 2026-02-26T17:42:01Z
date_updated: 2026-02-26T17:51:43Z
department:
- _id: '10'
- _id: '87'
- _id: '93'
editor:
- first_name: Jan
full_name: Frahm, Jan
last_name: Frahm
- first_name: Helge
full_name: Glöckner, Helge
id: '178'
last_name: Glöckner
- first_name: Joachim
full_name: Hilgert, Joachim
id: '220'
last_name: Hilgert
- first_name: Gestur
full_name: Olafsson, Gestur
last_name: Olafsson
intvolume: ' 35'
issue: '4'
language:
- iso: eng
publication: J. Lie Theory
quality_controlled: '1'
status: public
title: Special issue of Journal of Lie Theory dedicated to Karl-Hermann Neeb on the
occasion of his 60th birthday
type: journal_editor
user_id: '178'
volume: 35
year: '2025'
...
---
_id: '62079'
abstract:
- lang: eng
text: This paper investigates two modeling approaches for the simulation of the
deformation and decomposition behavior of preconsolidated rovings above the thermoplastic
matrix{\textquoteright} melting temperature. This is crucial for capturing the
local material structure after processes introducing highly localized deformation
such as mechanical joining processes between metal and fiber reinforced thermoplastics
(FRTP). A generic finite element (FE) model is developed, incorporating interfaces
discretized through either cohesive zone (CZ) elements or Coulomb friction-based
contacts. The material parameters for the FE elements are derived from the initial
stiffness of a statistical volume element (SVE) at micro scale modelled with an
Arbitrary-Lagrange-Eulerian method for three load cases. The CZ properties calculated
are based on the shear viscosity of the composite. The CZ and contact modelling
approaches are evaluated using three load cases of the SVE, comparing force-displacement
curves. Under simple loading conditions, such as normal pressure tension and bending,
both methods produce similar results; however, in complex load cases, the CZ approach
shows clear advantages in handling interface interactions and shows robust simulations.
The CZ approach thus presents a promising method for simulating roving decomposition
in FRTP-metal joining applications above the matrix{\textquoteright} melting temperature.
author:
- first_name: Benjamin
full_name: Gröger, Benjamin
last_name: Gröger
- first_name: Johannes
full_name: Gerritzen, Johannes
id: '105344'
last_name: Gerritzen
orcid: 0000-0002-0169-8602
- first_name: Andreas
full_name: Hornig, Andreas
last_name: Hornig
- first_name: Maik
full_name: Gude, Maik
last_name: Gude
citation:
ama: 'Gröger B, Gerritzen J, Hornig A, Gude M. Modeling approaches for the decomposition
behavior of preconsolidated rovings throughout local deformation processes. In:
Meschut G, Bobbert M, Duflou J, et al., eds. Sheet Metal 2025. Materials
Research Proceedings. Materials Research Forum LLC, Materials Research Foundations;
2025:268–275. doi:10.21741/9781644903551-33'
apa: Gröger, B., Gerritzen, J., Hornig, A., & Gude, M. (2025). Modeling approaches
for the decomposition behavior of preconsolidated rovings throughout local deformation
processes. In G. Meschut, M. Bobbert, J. Duflou, L. Fratini, H. Hagenah, P. Martins,
M. Merklein, & F. Micari (Eds.), Sheet Metal 2025 (pp. 268–275). Materials
Research Forum LLC, Materials Research Foundations. https://doi.org/10.21741/9781644903551-33
bibtex: '@inproceedings{Gröger_Gerritzen_Hornig_Gude_2025, series={Materials Research
Proceedings}, title={Modeling approaches for the decomposition behavior of preconsolidated
rovings throughout local deformation processes}, DOI={10.21741/9781644903551-33},
booktitle={Sheet Metal 2025}, publisher={Materials Research Forum LLC, Materials
Research Foundations}, author={Gröger, Benjamin and Gerritzen, Johannes and Hornig,
Andreas and Gude, Maik}, editor={Meschut, G. and Bobbert, M. and Duflou, J. and
Fratini, L. and Hagenah, H. and Martins, P. and Merklein, M. and Micari, F.},
year={2025}, pages={268–275}, collection={Materials Research Proceedings} }'
chicago: Gröger, Benjamin, Johannes Gerritzen, Andreas Hornig, and Maik Gude. “Modeling
Approaches for the Decomposition Behavior of Preconsolidated Rovings throughout
Local Deformation Processes.” In Sheet Metal 2025, edited by G. Meschut,
M. Bobbert, J. Duflou, L. Fratini, H. Hagenah, P. Martins, M. Merklein, and F.
Micari, 268–275. Materials Research Proceedings. Materials Research Forum LLC,
Materials Research Foundations, 2025. https://doi.org/10.21741/9781644903551-33.
ieee: 'B. Gröger, J. Gerritzen, A. Hornig, and M. Gude, “Modeling approaches for
the decomposition behavior of preconsolidated rovings throughout local deformation
processes,” in Sheet Metal 2025, 2025, pp. 268–275, doi: 10.21741/9781644903551-33.'
mla: Gröger, Benjamin, et al. “Modeling Approaches for the Decomposition Behavior
of Preconsolidated Rovings throughout Local Deformation Processes.” Sheet Metal
2025, edited by G. Meschut et al., Materials Research Forum LLC, Materials
Research Foundations, 2025, pp. 268–275, doi:10.21741/9781644903551-33.
short: 'B. Gröger, J. Gerritzen, A. Hornig, M. Gude, in: G. Meschut, M. Bobbert,
J. Duflou, L. Fratini, H. Hagenah, P. Martins, M. Merklein, F. Micari (Eds.),
Sheet Metal 2025, Materials Research Forum LLC, Materials Research Foundations,
2025, pp. 268–275.'
date_created: 2025-11-04T12:48:21Z
date_updated: 2026-02-27T06:43:19Z
doi: 10.21741/9781644903551-33
editor:
- first_name: G.
full_name: Meschut, G.
last_name: Meschut
- first_name: M.
full_name: Bobbert, M.
last_name: Bobbert
- first_name: J.
full_name: Duflou, J.
last_name: Duflou
- first_name: L.
full_name: Fratini, L.
last_name: Fratini
- first_name: H.
full_name: Hagenah, H.
last_name: Hagenah
- first_name: P.
full_name: Martins, P.
last_name: Martins
- first_name: M.
full_name: Merklein, M.
last_name: Merklein
- first_name: F.
full_name: Micari, F.
last_name: Micari
keyword:
- Finite Element Method (FEM)
- Process
- Thermoplastic Fiber Reinforced Plastic
language:
- iso: eng
page: 268–275
project:
- _id: '130'
name: 'TRR 285: Methodenentwicklung zur mechanischen Fügbarkeit in wandlungsfähigen
Prozessketten'
- _id: '137'
name: TRR 285 - Subproject A03
- _id: '131'
name: TRR 285 - Project Area A
publication: Sheet Metal 2025
publication_identifier:
isbn:
- 978-1-64490-354-4
publisher: Materials Research Forum LLC, Materials Research Foundations
series_title: Materials Research Proceedings
status: public
title: Modeling approaches for the decomposition behavior of preconsolidated rovings
throughout local deformation processes
type: conference
user_id: '105344'
year: '2025'
...
---
_id: '62080'
abstract:
- lang: eng
text: The failure behavior of fiber reinforced polymers (FRP) is strongly influenced
by their microstructure, i.e. fiber arrangement or local fiber volume content.
However, this information cannot be directly used for structural analyses, since
it requires a discretization on micrometer level. Therefore, current failure theories
do not directly account for such effects, but describe the behavior averaged over
an entire specimen. This foundation in experimentally accessible loading conditions
leads to purely theory based extension to more complex stress states without direct
validation possibilities. This work aims at leveraging micro-scale simulations
to obtain failure information under arbitrary loading conditions. The results
are propagated to the meso-scale, enabling efficient structural analyses, by means
of machine learning (ML). It is shown that the ML model is capable of correctly
assessing previously unseen stress states and therefore poses an efficient tool
of exploiting information from the micro-scale in larger simulations.
author:
- first_name: Johannes
full_name: Gerritzen, Johannes
id: '105344'
last_name: Gerritzen
orcid: 0000-0002-0169-8602
- first_name: Andreas
full_name: Hornig, Andreas
last_name: Hornig
- first_name: Maik
full_name: Gude, Maik
last_name: Gude
citation:
ama: 'Gerritzen J, Hornig A, Gude M. Efficient failure information propagation under
complex stress states in fiber reinforced polymers: From micro- to meso-scale
using machine learning. In: Meschut G, Bobbert M, Duflou J, et al., eds. Sheet
Metal 2025. Materials Research Proceedings. Materials Research Forum LLC,
Materials Research Foundations; 2025:260–267. doi:10.21741/9781644903551-32'
apa: 'Gerritzen, J., Hornig, A., & Gude, M. (2025). Efficient failure information
propagation under complex stress states in fiber reinforced polymers: From micro-
to meso-scale using machine learning. In G. Meschut, M. Bobbert, J. Duflou, L.
Fratini, H. Hagenah, P. Martins, M. Merklein, & F. Micari (Eds.), Sheet
Metal 2025 (pp. 260–267). Materials Research Forum LLC, Materials Research
Foundations. https://doi.org/10.21741/9781644903551-32'
bibtex: '@inproceedings{Gerritzen_Hornig_Gude_2025, series={Materials Research Proceedings},
title={Efficient failure information propagation under complex stress states in
fiber reinforced polymers: From micro- to meso-scale using machine learning},
DOI={10.21741/9781644903551-32},
booktitle={Sheet Metal 2025}, publisher={Materials Research Forum LLC, Materials
Research Foundations}, author={Gerritzen, Johannes and Hornig, Andreas and Gude,
Maik}, editor={Meschut, G. and Bobbert, M. and Duflou, J. and Fratini, L. and
Hagenah, H. and Martins, P. and Merklein, M. and Micari, F.}, year={2025}, pages={260–267},
collection={Materials Research Proceedings} }'
chicago: 'Gerritzen, Johannes, Andreas Hornig, and Maik Gude. “Efficient Failure
Information Propagation under Complex Stress States in Fiber Reinforced Polymers:
From Micro- to Meso-Scale Using Machine Learning.” In Sheet Metal 2025,
edited by G. Meschut, M. Bobbert, J. Duflou, L. Fratini, H. Hagenah, P. Martins,
M. Merklein, and F. Micari, 260–267. Materials Research Proceedings. Materials
Research Forum LLC, Materials Research Foundations, 2025. https://doi.org/10.21741/9781644903551-32.'
ieee: 'J. Gerritzen, A. Hornig, and M. Gude, “Efficient failure information propagation
under complex stress states in fiber reinforced polymers: From micro- to meso-scale
using machine learning,” in Sheet Metal 2025, 2025, pp. 260–267, doi: 10.21741/9781644903551-32.'
mla: 'Gerritzen, Johannes, et al. “Efficient Failure Information Propagation under
Complex Stress States in Fiber Reinforced Polymers: From Micro- to Meso-Scale
Using Machine Learning.” Sheet Metal 2025, edited by G. Meschut et al.,
Materials Research Forum LLC, Materials Research Foundations, 2025, pp. 260–267,
doi:10.21741/9781644903551-32.'
short: 'J. Gerritzen, A. Hornig, M. Gude, in: G. Meschut, M. Bobbert, J. Duflou,
L. Fratini, H. Hagenah, P. Martins, M. Merklein, F. Micari (Eds.), Sheet Metal
2025, Materials Research Forum LLC, Materials Research Foundations, 2025, pp.
260–267.'
date_created: 2025-11-04T12:48:37Z
date_updated: 2026-02-27T06:43:37Z
doi: 10.21741/9781644903551-32
editor:
- first_name: G.
full_name: Meschut, G.
last_name: Meschut
- first_name: M.
full_name: Bobbert, M.
last_name: Bobbert
- first_name: J.
full_name: Duflou, J.
last_name: Duflou
- first_name: L.
full_name: Fratini, L.
last_name: Fratini
- first_name: H.
full_name: Hagenah, H.
last_name: Hagenah
- first_name: P.
full_name: Martins, P.
last_name: Martins
- first_name: M.
full_name: Merklein, M.
last_name: Merklein
- first_name: F.
full_name: Micari, F.
last_name: Micari
keyword:
- Failure
- Fiber Reinforced Plastic
- Machine Learning
language:
- iso: eng
page: 260–267
project:
- _id: '130'
name: 'TRR 285: Methodenentwicklung zur mechanischen Fügbarkeit in wandlungsfähigen
Prozessketten'
- _id: '137'
name: TRR 285 - Subproject A03
- _id: '131'
name: TRR 285 - Project Area A
publication: Sheet Metal 2025
publication_identifier:
isbn:
- 978-1-64490-354-4
publisher: Materials Research Forum LLC, Materials Research Foundations
series_title: Materials Research Proceedings
status: public
title: 'Efficient failure information propagation under complex stress states in fiber
reinforced polymers: From micro- to meso-scale using machine learning'
type: conference
user_id: '105344'
year: '2025'
...
---
_id: '62081'
article_number: '114969'
author:
- first_name: Johannes
full_name: Gerritzen, Johannes
id: '105344'
last_name: Gerritzen
orcid: 0000-0002-0169-8602
- first_name: Benjamin
full_name: Gröger, Benjamin
last_name: Gröger
- first_name: Matthias
full_name: Zscheyge, Matthias
last_name: Zscheyge
- first_name: Andreas
full_name: Hornig, Andreas
last_name: Hornig
- first_name: Maik
full_name: Gude, Maik
last_name: Gude
citation:
ama: Gerritzen J, Gröger B, Zscheyge M, Hornig A, Gude M. 3D viscoelastic plastic
model coupled with a continuum damage formulation for fiber reinforced polymers.
Materials & Design. 2025;260. doi:10.1016/j.matdes.2025.114969
apa: Gerritzen, J., Gröger, B., Zscheyge, M., Hornig, A., & Gude, M. (2025).
3D viscoelastic plastic model coupled with a continuum damage formulation for
fiber reinforced polymers. Materials & Design, 260, Article
114969. https://doi.org/10.1016/j.matdes.2025.114969
bibtex: '@article{Gerritzen_Gröger_Zscheyge_Hornig_Gude_2025, title={3D viscoelastic
plastic model coupled with a continuum damage formulation for fiber reinforced
polymers}, volume={260}, DOI={10.1016/j.matdes.2025.114969},
number={114969}, journal={Materials & Design}, publisher={Elsevier BV},
author={Gerritzen, Johannes and Gröger, Benjamin and Zscheyge, Matthias and Hornig,
Andreas and Gude, Maik}, year={2025} }'
chicago: Gerritzen, Johannes, Benjamin Gröger, Matthias Zscheyge, Andreas Hornig,
and Maik Gude. “3D Viscoelastic Plastic Model Coupled with a Continuum Damage
Formulation for Fiber Reinforced Polymers.” Materials & Design
260 (2025). https://doi.org/10.1016/j.matdes.2025.114969.
ieee: 'J. Gerritzen, B. Gröger, M. Zscheyge, A. Hornig, and M. Gude, “3D viscoelastic
plastic model coupled with a continuum damage formulation for fiber reinforced
polymers,” Materials & Design, vol. 260, Art. no. 114969, 2025,
doi: 10.1016/j.matdes.2025.114969.'
mla: Gerritzen, Johannes, et al. “3D Viscoelastic Plastic Model Coupled with a Continuum
Damage Formulation for Fiber Reinforced Polymers.” Materials & Design,
vol. 260, 114969, Elsevier BV, 2025, doi:10.1016/j.matdes.2025.114969.
short: J. Gerritzen, B. Gröger, M. Zscheyge, A. Hornig, M. Gude, Materials &
Design 260 (2025).
date_created: 2025-11-04T12:49:13Z
date_updated: 2026-02-27T06:43:55Z
doi: 10.1016/j.matdes.2025.114969
intvolume: ' 260'
language:
- iso: eng
project:
- _id: '130'
name: 'TRR 285: Methodenentwicklung zur mechanischen Fügbarkeit in wandlungsfähigen
Prozessketten'
- _id: '137'
name: TRR 285 - Subproject A03
- _id: '131'
name: TRR 285 - Project Area A
publication: Materials & Design
publication_identifier:
issn:
- 0264-1275
publication_status: published
publisher: Elsevier BV
status: public
title: 3D viscoelastic plastic model coupled with a continuum damage formulation for
fiber reinforced polymers
type: journal_article
user_id: '105344'
volume: 260
year: '2025'
...
---
_id: '64770'
author:
- first_name: Matthieu
full_name: Pinaud, Matthieu
last_name: Pinaud
citation:
ama: Pinaud M. Manifold of Mappings and Regularity Properties of Half-Lie Groups.;
2025. doi:10.17619/UNIPB/1-2211
apa: Pinaud, M. (2025). Manifold of mappings and regularity properties of half-Lie
groups. https://doi.org/10.17619/UNIPB/1-2211
bibtex: '@book{Pinaud_2025, title={Manifold of mappings and regularity properties
of half-Lie groups}, DOI={10.17619/UNIPB/1-2211},
author={Pinaud, Matthieu}, year={2025} }'
chicago: Pinaud, Matthieu. Manifold of Mappings and Regularity Properties of
Half-Lie Groups, 2025. https://doi.org/10.17619/UNIPB/1-2211.
ieee: M. Pinaud, Manifold of mappings and regularity properties of half-Lie groups.
2025.
mla: Pinaud, Matthieu. Manifold of Mappings and Regularity Properties of Half-Lie
Groups. 2025, doi:10.17619/UNIPB/1-2211.
short: M. Pinaud, Manifold of Mappings and Regularity Properties of Half-Lie Groups,
2025.
date_created: 2026-02-26T21:58:22Z
date_updated: 2026-02-26T21:58:36Z
department:
- _id: '10'
- _id: '87'
- _id: '93'
doi: 10.17619/UNIPB/1-2211
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://nbn-resolving.org/urn:nbn:de:hbz:466:2-54221
oa: '1'
status: public
supervisor:
- first_name: Helge
full_name: Glöckner, Helge
id: '178'
last_name: Glöckner
title: Manifold of mappings and regularity properties of half-Lie groups
type: dissertation
user_id: '178'
year: '2025'
...
---
_id: '61149'
abstract:
- lang: eng
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.
author:
- first_name: Alrik
full_name: Dargel, Alrik
id: '114764'
last_name: Dargel
- first_name: Benjamin
full_name: Gröger, Benjamin
last_name: Gröger
- first_name: Malte Christian
full_name: Schlichter, Malte Christian
id: '61977'
last_name: Schlichter
- first_name: Johannes
full_name: Gerritzen, Johannes
id: '105344'
last_name: Gerritzen
orcid: 0000-0002-0169-8602
- first_name: Daniel
full_name: Köhler, Daniel
id: '83408'
last_name: Köhler
- first_name: Gerson
full_name: Meschut, Gerson
id: '32056'
last_name: Meschut
orcid: 0000-0002-2763-1246
- first_name: Maik
full_name: Gude, Maik
last_name: Gude
- first_name: Robert
full_name: Kupfer, Robert
last_name: Kupfer
citation:
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'
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'
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} }'
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.'
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.'
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.'
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.'
conference:
end_date: 2025-07-18
location: Porto
name: 8th International Conference on Integrity-Reliability-Failure (IRF2025)
start_date: 2025-07-15
date_created: 2025-09-08T11:52:45Z
date_updated: 2026-02-27T06:45:17Z
doi: 10.24840/978-972-752-323-8
editor:
- first_name: J.F. Silva
full_name: Gomes, J.F. Silva
last_name: Gomes
- first_name: Shaker A.
full_name: Meguid, Shaker A.
last_name: Meguid
keyword:
- self-piercing riveting
- computed tomography
- thermoplastic composites
- process-structure-interaction
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://www.researchgate.net/publication/395593556_LOCAL_DEFORMATION_AND_FAILURE_OF_COMPOSITES_DURING_SELF-PIERCING_RIVETING_A_CT_BASED_MICROSTRUCTURE_INVESTIGATION
oa: '1'
place: Porto
project:
- _id: '133'
name: TRR 285 - Project Area C
- _id: '148'
name: TRR 285 - Subproject C04
- _id: '130'
name: 'TRR 285: Methodenentwicklung zur mechanischen Fügbarkeit in wandlungsfähigen
Prozessketten'
- _id: '131'
name: TRR 285 - Project Area A
- _id: '137'
name: TRR 285 - Subproject A03
- _id: '135'
name: TRR 285 - Subproject A01
publication: Proceedings of the 8th International Conference on Integrity-Reliability-Failure
(IRF2025)
publication_identifier:
isbn:
- '9789727523238'
publication_status: published
publisher: FEUP
status: public
title: 'LOCAL DEFORMATION AND FAILURE OF COMPOSITES DURING SELF-PIERCING RIVETING:
A CT BASED MICROSTRUCTURE INVESTIGATION'
type: conference
user_id: '105344'
year: '2025'
...
---
_id: '63828'
article_number: '100368'
author:
- first_name: Johannes
full_name: Gerritzen, Johannes
id: '105344'
last_name: Gerritzen
orcid: 0000-0002-0169-8602
- first_name: Kunal
full_name: Chopra, Kunal
last_name: Chopra
- first_name: Gregor
full_name: Reschke, Gregor
id: '98812'
last_name: Reschke
- first_name: Andreas
full_name: Hornig, Andreas
last_name: Hornig
- first_name: Alexander
full_name: Brosius, Alexander
last_name: Brosius
- first_name: Maik
full_name: Gude, Maik
last_name: Gude
citation:
ama: Gerritzen J, Chopra K, Reschke G, Hornig A, Brosius A, Gude M. Quality assurance
of clinched joints using explainable machine learning. Journal of Advanced
Joining Processes. 2025;13. doi:10.1016/j.jajp.2025.100368
apa: Gerritzen, J., Chopra, K., Reschke, G., Hornig, A., Brosius, A., & Gude,
M. (2025). Quality assurance of clinched joints using explainable machine learning.
Journal of Advanced Joining Processes, 13, Article 100368. https://doi.org/10.1016/j.jajp.2025.100368
bibtex: '@article{Gerritzen_Chopra_Reschke_Hornig_Brosius_Gude_2025, title={Quality
assurance of clinched joints using explainable machine learning}, volume={13},
DOI={10.1016/j.jajp.2025.100368},
number={100368}, journal={Journal of Advanced Joining Processes}, publisher={Elsevier
BV}, author={Gerritzen, Johannes and Chopra, Kunal and Reschke, Gregor and Hornig,
Andreas and Brosius, Alexander and Gude, Maik}, year={2025} }'
chicago: Gerritzen, Johannes, Kunal Chopra, Gregor Reschke, Andreas Hornig, Alexander
Brosius, and Maik Gude. “Quality Assurance of Clinched Joints Using Explainable
Machine Learning.” Journal of Advanced Joining Processes 13 (2025). https://doi.org/10.1016/j.jajp.2025.100368.
ieee: 'J. Gerritzen, K. Chopra, G. Reschke, A. Hornig, A. Brosius, and M. Gude,
“Quality assurance of clinched joints using explainable machine learning,” Journal
of Advanced Joining Processes, vol. 13, Art. no. 100368, 2025, doi: 10.1016/j.jajp.2025.100368.'
mla: Gerritzen, Johannes, et al. “Quality Assurance of Clinched Joints Using Explainable
Machine Learning.” Journal of Advanced Joining Processes, vol. 13, 100368,
Elsevier BV, 2025, doi:10.1016/j.jajp.2025.100368.
short: J. Gerritzen, K. Chopra, G. Reschke, A. Hornig, A. Brosius, M. Gude, Journal
of Advanced Joining Processes 13 (2025).
date_created: 2026-02-02T08:32:04Z
date_updated: 2026-02-27T06:45:47Z
doi: 10.1016/j.jajp.2025.100368
intvolume: ' 13'
language:
- iso: eng
project:
- _id: '137'
name: TRR 285 - Subproject A03
- _id: '131'
name: TRR 285 - Project Area A
- _id: '130'
name: 'TRR 285: Methodenentwicklung zur mechanischen Fügbarkeit in wandlungsfähigen
Prozessketten'
- _id: '133'
name: TRR 285 - Project Area C
- _id: '148'
name: TRR 285 - Subproject C04
publication: Journal of Advanced Joining Processes
publication_identifier:
issn:
- 2666-3309
publication_status: published
publisher: Elsevier BV
status: public
title: Quality assurance of clinched joints using explainable machine learning
type: journal_article
user_id: '105344'
volume: 13
year: '2025'
...
---
_id: '59441'
abstract:
- lang: eng
text: 'Abstract. Accurate Finite Element Modeling (FEM) of joints is essential
in the design of complex mechanical systems such as automotive body-in-white (BIW)
structures, as it plays a critical role in evaluating their performance. Although
well-established techniques exist for modeling rotationally symmetric joints,
there remains a significant gap in effectively modeling non-rotationally symmetric
joints. These joints are particularly relevant in the automotive BIW, where they
can better accommodate anisotropic loading conditions. In this study, strategies
for modeling non-rotationally symmetric joints were explored using finite element
simulations in LS-DYNA. The findings demonstrate that discrete beam elements can
capture the anisotropic characteristics of such joints. Two models were tested:
a single-beam model for stiffness periodicity every 90°, and a three-beam model
for stiffness periodicity every 120°. Force responses, stress distribution, and
sheet bending behaviors were analyzed, confirming that discrete beam elements
can accurately represent direction-dependent stiffness. These results establish
a foundation for developing advanced joint modeling strategies in complex mechanical
systems.'
author:
- first_name: Deekshith Reddy
full_name: Devulapally, Deekshith Reddy
id: '76837'
last_name: Devulapally
- first_name: Thomas
full_name: Tröster, Thomas
id: '553'
last_name: Tröster
citation:
ama: 'Devulapally DR, Tröster T. Modelling strategies for non-rotationally symmetric
joints. In: Materials Research Proceedings. Vol 52. Materials Research
Forum LLC; 2025. doi:10.21741/9781644903551-21'
apa: Devulapally, D. R., & Tröster, T. (2025). Modelling strategies for non-rotationally
symmetric joints. Materials Research Proceedings, 52. https://doi.org/10.21741/9781644903551-21
bibtex: '@inproceedings{Devulapally_Tröster_2025, title={Modelling strategies for
non-rotationally symmetric joints}, volume={52}, DOI={10.21741/9781644903551-21},
booktitle={Materials Research Proceedings}, publisher={Materials Research Forum
LLC}, author={Devulapally, Deekshith Reddy and Tröster, Thomas}, year={2025} }'
chicago: Devulapally, Deekshith Reddy, and Thomas Tröster. “Modelling Strategies
for Non-Rotationally Symmetric Joints.” In Materials Research Proceedings,
Vol. 52. Materials Research Forum LLC, 2025. https://doi.org/10.21741/9781644903551-21.
ieee: 'D. R. Devulapally and T. Tröster, “Modelling strategies for non-rotationally
symmetric joints,” in Materials Research Proceedings, Paderborn, 2025,
vol. 52, doi: 10.21741/9781644903551-21.'
mla: Devulapally, Deekshith Reddy, and Thomas Tröster. “Modelling Strategies for
Non-Rotationally Symmetric Joints.” Materials Research Proceedings, vol.
52, Materials Research Forum LLC, 2025, doi:10.21741/9781644903551-21.
short: 'D.R. Devulapally, T. Tröster, in: Materials Research Proceedings, Materials
Research Forum LLC, 2025.'
conference:
end_date: 2025-04-03
location: Paderborn
name: '21st International conference on sheet metal '
start_date: 2025-04-01
date_created: 2025-04-08T14:57:51Z
date_updated: 2026-02-27T10:50:10Z
department:
- _id: '149'
- _id: '9'
- _id: '321'
doi: 10.21741/9781644903551-21
intvolume: ' 52'
language:
- iso: eng
project:
- _id: '140'
name: 'TRR 285 – B01: TRR 285 - Subproject B01'
- _id: '52'
name: 'PC2: Computing Resources Provided by the Paderborn Center for Parallel Computing'
- _id: '130'
name: 'TRR 285: Methodenentwicklung zur mechanischen Fügbarkeit in wandlungsfähigen
Prozessketten'
publication: Materials Research Proceedings
publication_identifier:
issn:
- 2474-395X
publication_status: published
publisher: Materials Research Forum LLC
status: public
title: Modelling strategies for non-rotationally symmetric joints
type: conference
user_id: '76837'
volume: 52
year: '2025'
...
---
_id: '62041'
author:
- first_name: Eileen
full_name: Reckmann, Eileen
id: '101166'
last_name: Reckmann
- first_name: Katrin
full_name: Temmen, Katrin
id: '30086'
last_name: Temmen
citation:
ama: 'Reckmann E, Temmen K. Intrinsic Motivation in Stem Outreach: An Analysis of
External Factors in Voluntary and School-Based Lab Settings. In: Gómez Chova L,
González Martínez C, Lees J, eds. EDULEARN Proceedings. Vol 1. IATED; 2025.
doi:10.21125/edulearn.2025.2462'
apa: 'Reckmann, E., & Temmen, K. (2025). Intrinsic Motivation in Stem Outreach:
An Analysis of External Factors in Voluntary and School-Based Lab Settings. In
L. Gómez Chova, C. González Martínez, & J. Lees (Eds.), EDULEARN Proceedings
(Vol. 1). IATED. https://doi.org/10.21125/edulearn.2025.2462'
bibtex: '@inproceedings{Reckmann_Temmen_2025, title={Intrinsic Motivation in Stem
Outreach: An Analysis of External Factors in Voluntary and School-Based Lab Settings},
volume={1}, DOI={10.21125/edulearn.2025.2462},
booktitle={EDULEARN Proceedings}, publisher={IATED}, author={Reckmann, Eileen
and Temmen, Katrin}, editor={Gómez Chova, Luis and González Martínez, Chelo and
Lees, Joanna}, year={2025} }'
chicago: 'Reckmann, Eileen, and Katrin Temmen. “Intrinsic Motivation in Stem Outreach:
An Analysis of External Factors in Voluntary and School-Based Lab Settings.” In
EDULEARN Proceedings, edited by Luis Gómez Chova, Chelo González Martínez,
and Joanna Lees, Vol. 1. IATED, 2025. https://doi.org/10.21125/edulearn.2025.2462.'
ieee: 'E. Reckmann and K. Temmen, “Intrinsic Motivation in Stem Outreach: An Analysis
of External Factors in Voluntary and School-Based Lab Settings,” in EDULEARN
Proceedings, 2025, vol. 1, doi: 10.21125/edulearn.2025.2462.'
mla: 'Reckmann, Eileen, and Katrin Temmen. “Intrinsic Motivation in Stem Outreach:
An Analysis of External Factors in Voluntary and School-Based Lab Settings.” EDULEARN
Proceedings, edited by Luis Gómez Chova et al., vol. 1, IATED, 2025, doi:10.21125/edulearn.2025.2462.'
short: 'E. Reckmann, K. Temmen, in: L. Gómez Chova, C. González Martínez, J. Lees
(Eds.), EDULEARN Proceedings, IATED, 2025.'
date_created: 2025-11-03T09:25:42Z
date_updated: 2026-02-27T11:17:10Z
department:
- _id: '300'
doi: 10.21125/edulearn.2025.2462
editor:
- first_name: 'Luis '
full_name: 'Gómez Chova, Luis '
last_name: Gómez Chova
- first_name: Chelo
full_name: González Martínez, Chelo
last_name: González Martínez
- first_name: Joanna
full_name: Lees, Joanna
last_name: Lees
intvolume: ' 1'
language:
- iso: eng
publication: EDULEARN Proceedings
publication_identifier:
issn:
- 2340-1117
publication_status: published
publisher: IATED
status: public
title: 'Intrinsic Motivation in Stem Outreach: An Analysis of External Factors in
Voluntary and School-Based Lab Settings'
type: conference
user_id: '101166'
volume: 1
year: '2025'
...
---
_id: '64786'
author:
- first_name: Laura
full_name: Müller, Laura
id: '44605'
last_name: Müller
- first_name: Niclas
full_name: Meihöfener, Niclas
id: '38611'
last_name: Meihöfener
- first_name: Johannes Gabriel
full_name: Siemoneit, Johannes Gabriel
id: '98462'
last_name: Siemoneit
orcid: 0000-0002-2543-2331
- first_name: Iryna
full_name: Mozgova, Iryna
id: '95903'
last_name: Mozgova
citation:
ama: 'Müller L, Meihöfener N, Siemoneit JG, Mozgova I. Introduction of electronic
lab notebooks in engineering education - opportunities for a cultural change.
In: Engineering Education for Sustainable Development (EESD2025). ; 2025.
doi:https://doi.org/10.71779/776'
apa: Müller, L., Meihöfener, N., Siemoneit, J. G., & Mozgova, I. (2025). Introduction
of electronic lab notebooks in engineering education - opportunities for a cultural
change. Engineering Education for Sustainable Development (EESD2025). https://doi.org/10.71779/776
bibtex: '@inproceedings{Müller_Meihöfener_Siemoneit_Mozgova_2025, title={Introduction
of electronic lab notebooks in engineering education - opportunities for a cultural
change}, DOI={https://doi.org/10.71779/776},
booktitle={Engineering Education for Sustainable Development (EESD2025)}, author={Müller,
Laura and Meihöfener, Niclas and Siemoneit, Johannes Gabriel and Mozgova, Iryna},
year={2025} }'
chicago: Müller, Laura, Niclas Meihöfener, Johannes Gabriel Siemoneit, and Iryna
Mozgova. “Introduction of Electronic Lab Notebooks in Engineering Education -
Opportunities for a Cultural Change.” In Engineering Education for Sustainable
Development (EESD2025), 2025. https://doi.org/10.71779/776.
ieee: 'L. Müller, N. Meihöfener, J. G. Siemoneit, and I. Mozgova, “Introduction
of electronic lab notebooks in engineering education - opportunities for a cultural
change,” 2025, doi: https://doi.org/10.71779/776.'
mla: Müller, Laura, et al. “Introduction of Electronic Lab Notebooks in Engineering
Education - Opportunities for a Cultural Change.” Engineering Education for
Sustainable Development (EESD2025), 2025, doi:https://doi.org/10.71779/776.
short: 'L. Müller, N. Meihöfener, J.G. Siemoneit, I. Mozgova, in: Engineering Education
for Sustainable Development (EESD2025), 2025.'
date_created: 2026-02-27T14:24:40Z
date_updated: 2026-02-27T14:27:09Z
department:
- _id: '741'
doi: https://doi.org/10.71779/776
language:
- iso: eng
publication: Engineering Education for Sustainable Development (EESD2025)
quality_controlled: '1'
status: public
title: Introduction of electronic lab notebooks in engineering education - opportunities
for a cultural change
type: conference
user_id: '44605'
year: '2025'
...