---
_id: '63505'
abstract:
- lang: eng
text: |-
Abstract
The main goal of this work is to study the $L^{p}$-asymptotic behavior of solutions to the heat equation on arbitrary rank Riemannian symmetric spaces of non-compact-type $G/K$ for non-bi-$K$ invariant initial data. For initial data $u_{0}$ compactly supported or in a weighted $L^{1}(G/K)$ space with a weight depending on $p\in [1, \infty ]$, we introduce a mass function $M_{p}(u_{0})(\cdot )$, and prove that if $h_{t}$ is the heat kernel on $G/K$, then $$ \begin{align*} &\|h_t\|_p^{-1}\,\|u_0\ast h_t \, - \,M_p(u_0)(\cdot)\,h_t\|_p \rightarrow 0 \quad \textrm{as} \quad t\rightarrow \infty.\end{align*} $$ Interestingly, the $L^{p}$ heat concentration leads to completely different expressions of the mass function for $1\leq p <2$ and $2\leq p\leq \infty $. If we further assume that the initial data are bi-$K$-invariant, then our mass function boils down to the constant $\int _{G/K}u_{0}$ in the case $p=1$, and more generally to $\mathcal{H}{u_{0}}(i\rho (2/p-1))$ if $1\leq p<2$, and to $\mathcal{H}{u_{0}}(0)$ if $2\leq p \leq \infty $. Thus, we improve upon results by Vázquez, Anker et al., and Naik et al., clarifying the nature of the problem.
article_number: rnaf074
author:
- first_name: Effie
full_name: Papageorgiou, Effie
last_name: Papageorgiou
citation:
ama: Papageorgiou E. L p Asymptotics for the Heat Equation on Symmetric
Spaces for Non-symmetric Solutions. International Mathematics Research Notices.
2025;2025(7). doi:10.1093/imrn/rnaf074
apa: Papageorgiou, E. (2025). L p Asymptotics for the Heat Equation
on Symmetric Spaces for Non-symmetric Solutions. International Mathematics
Research Notices, 2025(7), Article rnaf074. https://doi.org/10.1093/imrn/rnaf074
bibtex: '@article{Papageorgiou_2025, title={L p Asymptotics for
the Heat Equation on Symmetric Spaces for Non-symmetric Solutions}, volume={2025},
DOI={10.1093/imrn/rnaf074},
number={7rnaf074}, journal={International Mathematics Research Notices}, publisher={Oxford
University Press (OUP)}, author={Papageorgiou, Effie}, year={2025} }'
chicago: Papageorgiou, Effie. “L p Asymptotics for the Heat Equation
on Symmetric Spaces for Non-Symmetric Solutions.” International Mathematics
Research Notices 2025, no. 7 (2025). https://doi.org/10.1093/imrn/rnaf074.
ieee: 'E. Papageorgiou, “L p Asymptotics for the Heat Equation
on Symmetric Spaces for Non-symmetric Solutions,” International Mathematics
Research Notices, vol. 2025, no. 7, Art. no. rnaf074, 2025, doi: 10.1093/imrn/rnaf074.'
mla: Papageorgiou, Effie. “L p Asymptotics for the Heat Equation
on Symmetric Spaces for Non-Symmetric Solutions.” International Mathematics
Research Notices, vol. 2025, no. 7, rnaf074, Oxford University Press (OUP),
2025, doi:10.1093/imrn/rnaf074.
short: E. Papageorgiou, International Mathematics Research Notices 2025 (2025).
date_created: 2026-01-06T09:45:00Z
date_updated: 2026-01-06T09:45:12Z
doi: 10.1093/imrn/rnaf074
intvolume: ' 2025'
issue: '7'
language:
- iso: eng
publication: International Mathematics Research Notices
publication_identifier:
issn:
- 1073-7928
- 1687-0247
publication_status: published
publisher: Oxford University Press (OUP)
status: public
title: |-
L
p Asymptotics for the Heat Equation on Symmetric Spaces for Non-symmetric Solutions
type: journal_article
user_id: '100325'
volume: 2025
year: '2025'
...
---
_id: '63503'
author:
- first_name: Tommaso
full_name: Bruno, Tommaso
last_name: Bruno
- first_name: Effie
full_name: Papageorgiou, Effie
last_name: Papageorgiou
citation:
ama: Bruno T, Papageorgiou E. Pointwise convergence to initial data for some evolution
equations on symmetric spaces. Journal d’Analyse Mathématique. 2025;157(2):733-767.
doi:10.1007/s11854-025-0403-2
apa: Bruno, T., & Papageorgiou, E. (2025). Pointwise convergence to initial
data for some evolution equations on symmetric spaces. Journal d’Analyse Mathématique,
157(2), 733–767. https://doi.org/10.1007/s11854-025-0403-2
bibtex: '@article{Bruno_Papageorgiou_2025, title={Pointwise convergence to initial
data for some evolution equations on symmetric spaces}, volume={157}, DOI={10.1007/s11854-025-0403-2},
number={2}, journal={Journal d’Analyse Mathématique}, publisher={Springer Science
and Business Media LLC}, author={Bruno, Tommaso and Papageorgiou, Effie}, year={2025},
pages={733–767} }'
chicago: 'Bruno, Tommaso, and Effie Papageorgiou. “Pointwise Convergence to Initial
Data for Some Evolution Equations on Symmetric Spaces.” Journal d’Analyse Mathématique
157, no. 2 (2025): 733–67. https://doi.org/10.1007/s11854-025-0403-2.'
ieee: 'T. Bruno and E. Papageorgiou, “Pointwise convergence to initial data for
some evolution equations on symmetric spaces,” Journal d’Analyse Mathématique,
vol. 157, no. 2, pp. 733–767, 2025, doi: 10.1007/s11854-025-0403-2.'
mla: Bruno, Tommaso, and Effie Papageorgiou. “Pointwise Convergence to Initial Data
for Some Evolution Equations on Symmetric Spaces.” Journal d’Analyse Mathématique,
vol. 157, no. 2, Springer Science and Business Media LLC, 2025, pp. 733–67, doi:10.1007/s11854-025-0403-2.
short: T. Bruno, E. Papageorgiou, Journal d’Analyse Mathématique 157 (2025) 733–767.
date_created: 2026-01-06T09:40:00Z
date_updated: 2026-01-06T09:41:02Z
doi: 10.1007/s11854-025-0403-2
intvolume: ' 157'
issue: '2'
language:
- iso: eng
page: 733-767
publication: Journal d'Analyse Mathématique
publication_identifier:
issn:
- 0021-7670
- 1565-8538
publication_status: published
publisher: Springer Science and Business Media LLC
status: public
title: Pointwise convergence to initial data for some evolution equations on symmetric
spaces
type: journal_article
user_id: '100325'
volume: 157
year: '2025'
...
---
_id: '61753'
abstract:
- lang: eng
text: This paper presents LOLA, a massively multilingual large language model trained
on more than 160 languages using a sparse Mixture-of-Experts Transformer architecture.
Our architectural and implementation choices address the challenge of harnessing
linguistic diversity while maintaining efficiency and avoiding the common pitfalls
of multilinguality. Our analysis of the evaluation results shows competitive performance
in natural language generation and understanding tasks. Additionally, we demonstrate
how the learned expert-routing mechanism exploits implicit phylogenetic linguistic
patterns to potentially alleviate the curse of multilinguality. We provide an
in-depth look at the training process, an analysis of the datasets, and a balanced
exploration of the model{’}s strengths and limitations. As an open-source model,
LOLA promotes reproducibility and serves as a robust foundation for future research.
Our findings enable the development of compute-efficient multilingual models with
strong, scalable performance across languages.
author:
- first_name: Nikit
full_name: Srivastava, Nikit
id: '70066'
last_name: Srivastava
orcid: 0009-0004-5164-4911
- first_name: Denis
full_name: Kuchelev, Denis
id: '70842'
last_name: Kuchelev
- first_name: Tatiana
full_name: Moteu Ngoli, Tatiana
id: '99174'
last_name: Moteu Ngoli
- first_name: Kshitij
full_name: Shetty, Kshitij
last_name: Shetty
- first_name: Michael
full_name: Röder, Michael
id: '67199'
last_name: Röder
orcid: https://orcid.org/0000-0002-8609-8277
- first_name: Hamada Mohamed Abdelsamee
full_name: Zahera, Hamada Mohamed Abdelsamee
id: '72768'
last_name: Zahera
orcid: 0000-0003-0215-1278
- first_name: Diego
full_name: Moussallem, Diego
id: '71635'
last_name: Moussallem
- first_name: Axel-Cyrille
full_name: Ngonga Ngomo, Axel-Cyrille
id: '65716'
last_name: Ngonga Ngomo
citation:
ama: 'Srivastava N, Kuchelev D, Moteu Ngoli T, et al. LOLA – An Open-Source Massively
Multilingual Large Language Model. In: Rambow O, Wanner L, Apidianaki M, Al-Khalifa
H, Eugenio BD, Schockaert S, eds. Proceedings of the 31st International Conference
on Computational Linguistics. Association for Computational Linguistics; 2025:6420–6446.'
apa: Srivastava, N., Kuchelev, D., Moteu Ngoli, T., Shetty, K., Röder, M., Zahera,
H. M. A., Moussallem, D., & Ngonga Ngomo, A.-C. (2025). LOLA – An Open-Source
Massively Multilingual Large Language Model. In O. Rambow, L. Wanner, M. Apidianaki,
H. Al-Khalifa, B. D. Eugenio, & S. Schockaert (Eds.), Proceedings of the
31st International Conference on Computational Linguistics (pp. 6420–6446).
Association for Computational Linguistics.
bibtex: '@inproceedings{Srivastava_Kuchelev_Moteu Ngoli_Shetty_Röder_Zahera_Moussallem_Ngonga
Ngomo_2025, place={Abu Dhabi, UAE}, title={LOLA – An Open-Source Massively Multilingual
Large Language Model}, booktitle={Proceedings of the 31st International Conference
on Computational Linguistics}, publisher={Association for Computational Linguistics},
author={Srivastava, Nikit and Kuchelev, Denis and Moteu Ngoli, Tatiana and Shetty,
Kshitij and Röder, Michael and Zahera, Hamada Mohamed Abdelsamee and Moussallem,
Diego and Ngonga Ngomo, Axel-Cyrille}, editor={Rambow, Owen and Wanner, Leo and
Apidianaki, Marianna and Al-Khalifa, Hend and Eugenio, Barbara Di and Schockaert,
Steven}, year={2025}, pages={6420–6446} }'
chicago: 'Srivastava, Nikit, Denis Kuchelev, Tatiana Moteu Ngoli, Kshitij Shetty,
Michael Röder, Hamada Mohamed Abdelsamee Zahera, Diego Moussallem, and Axel-Cyrille
Ngonga Ngomo. “LOLA – An Open-Source Massively Multilingual Large Language Model.”
In Proceedings of the 31st International Conference on Computational Linguistics,
edited by Owen Rambow, Leo Wanner, Marianna Apidianaki, Hend Al-Khalifa, Barbara
Di Eugenio, and Steven Schockaert, 6420–6446. Abu Dhabi, UAE: Association for
Computational Linguistics, 2025.'
ieee: N. Srivastava et al., “LOLA – An Open-Source Massively Multilingual
Large Language Model,” in Proceedings of the 31st International Conference
on Computational Linguistics, 2025, pp. 6420–6446.
mla: Srivastava, Nikit, et al. “LOLA – An Open-Source Massively Multilingual Large
Language Model.” Proceedings of the 31st International Conference on Computational
Linguistics, edited by Owen Rambow et al., Association for Computational Linguistics,
2025, pp. 6420–6446.
short: 'N. Srivastava, D. Kuchelev, T. Moteu Ngoli, K. Shetty, M. Röder, H.M.A.
Zahera, D. Moussallem, A.-C. Ngonga Ngomo, in: O. Rambow, L. Wanner, M. Apidianaki,
H. Al-Khalifa, B.D. Eugenio, S. Schockaert (Eds.), Proceedings of the 31st International
Conference on Computational Linguistics, Association for Computational Linguistics,
Abu Dhabi, UAE, 2025, pp. 6420–6446.'
date_created: 2025-10-08T11:02:30Z
date_updated: 2026-01-06T10:11:37Z
editor:
- first_name: Owen
full_name: Rambow, Owen
last_name: Rambow
- first_name: Leo
full_name: Wanner, Leo
last_name: Wanner
- first_name: Marianna
full_name: Apidianaki, Marianna
last_name: Apidianaki
- first_name: Hend
full_name: Al-Khalifa, Hend
last_name: Al-Khalifa
- first_name: Barbara Di
full_name: Eugenio, Barbara Di
last_name: Eugenio
- first_name: Steven
full_name: Schockaert, Steven
last_name: Schockaert
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://aclanthology.org/2025.coling-main.428.pdf
oa: '1'
page: 6420–6446
place: Abu Dhabi, UAE
publication: Proceedings of the 31st International Conference on Computational Linguistics
publisher: Association for Computational Linguistics
status: public
title: LOLA – An Open-Source Massively Multilingual Large Language Model
type: conference
user_id: '70066'
year: '2025'
...
---
_id: '63507'
author:
- first_name: Gaurav
full_name: Pandit, Gaurav
last_name: Pandit
- first_name: Michael
full_name: Röder, Michael
id: '67199'
last_name: Röder
orcid: https://orcid.org/0000-0002-8609-8277
- first_name: Axel-Cyrille
full_name: Ngonga Ngomo, Axel-Cyrille
id: '65716'
last_name: Ngonga Ngomo
citation:
ama: 'Pandit G, Röder M, Ngonga Ngomo A-C. Evaluating Approximate Nearest Neighbour
Search Systems on Knowledge Graph Embeddings. In: Lecture Notes in Computer
Science. Springer Nature Switzerland; 2025. doi:10.1007/978-3-031-94575-5_4'
apa: Pandit, G., Röder, M., & Ngonga Ngomo, A.-C. (2025). Evaluating Approximate
Nearest Neighbour Search Systems on Knowledge Graph Embeddings. In Lecture
Notes in Computer Science. Springer Nature Switzerland. https://doi.org/10.1007/978-3-031-94575-5_4
bibtex: '@inbook{Pandit_Röder_Ngonga Ngomo_2025, place={Cham}, title={Evaluating
Approximate Nearest Neighbour Search Systems on Knowledge Graph Embeddings}, DOI={10.1007/978-3-031-94575-5_4},
booktitle={Lecture Notes in Computer Science}, publisher={Springer Nature Switzerland},
author={Pandit, Gaurav and Röder, Michael and Ngonga Ngomo, Axel-Cyrille}, year={2025}
}'
chicago: 'Pandit, Gaurav, Michael Röder, and Axel-Cyrille Ngonga Ngomo. “Evaluating
Approximate Nearest Neighbour Search Systems on Knowledge Graph Embeddings.” In
Lecture Notes in Computer Science. Cham: Springer Nature Switzerland, 2025.
https://doi.org/10.1007/978-3-031-94575-5_4.'
ieee: 'G. Pandit, M. Röder, and A.-C. Ngonga Ngomo, “Evaluating Approximate Nearest
Neighbour Search Systems on Knowledge Graph Embeddings,” in Lecture Notes in
Computer Science, Cham: Springer Nature Switzerland, 2025.'
mla: Pandit, Gaurav, et al. “Evaluating Approximate Nearest Neighbour Search Systems
on Knowledge Graph Embeddings.” Lecture Notes in Computer Science, Springer
Nature Switzerland, 2025, doi:10.1007/978-3-031-94575-5_4.
short: 'G. Pandit, M. Röder, A.-C. Ngonga Ngomo, in: Lecture Notes in Computer Science,
Springer Nature Switzerland, Cham, 2025.'
date_created: 2026-01-06T09:53:58Z
date_updated: 2026-01-06T09:55:26Z
department:
- _id: '574'
- _id: '923'
doi: 10.1007/978-3-031-94575-5_4
language:
- iso: eng
place: Cham
publication: Lecture Notes in Computer Science
publication_identifier:
isbn:
- '9783031945748'
- '9783031945755'
issn:
- 0302-9743
- 1611-3349
publication_status: published
publisher: Springer Nature Switzerland
status: public
title: Evaluating Approximate Nearest Neighbour Search Systems on Knowledge Graph
Embeddings
type: book_chapter
user_id: '67199'
year: '2025'
...
---
_id: '63511'
abstract:
- lang: eng
text: Der unsystematische und ineffiziente Umgang mit technischen Änderungen führt
zuhohen Personalkosten durch Mehraufwand, einer reduzierten Entscheidungsqualität
und kannin Projektfehlschlägen resultieren. Herausforderungen beim Umgang mit
technischen Änderungenliegen in der Berücksichtigung relevanter Ursache-Wirkungs-Zusammenhänge,
der quantitativen und qualitativen Bewertung der Auswirkungen und der effizienten
prozessualen Einbindung. Mithilfe eines modellbasierten Lösungsansatzes lassen
sich die Auswirkungen technischer Änderungen schneller bewerten und fundierte
Entwicklungsentscheidungen treffen. In der vorliegenden Dissertation wird eine
Methodik für die Entwicklung modell-basierter Wirkkettenanalysen zur Bewertung
technischer Änderungen beschrieben. Durch die modellbasierte Wirkkettenanalyse
können direkt oder indirekt von der Änderung betroffene Modellelemente identifiziert
werden. Das Datenmodell wird mithilfe von Abfragesprachen analysiert und die Auswirkungen
werden mithilfe von integrierten Metriken quantifiziert. Die Ergebnisse der Wirkkettenanalyse
werden in rollenspezifischen Sichten bereitgestellt, wodurch eine bedarfsgerechte
Entscheidungsunterstützung gewährleistet wird. Die Validierung anhand von vier
industriellen Fallstudien belegt die Praxistauglichkeit der Methodik. Die Methodik
verbindet das Änderungsmanagement mit den Vorteilen einer modellbasierten Systementwicklung
und bildet somit einen synergetischen neuen Forschungsbereich.
- lang: eng
text: The unsystematic and inefficient handling of technical changes leads to high
personnel costs due to additional work, reduced decision-making quality and can
result in project failures. The challenges in dealing with technical changes arise
in the consideration of relevant cause-and-effect relationships, the quantitative
and qualitative assessment of the effects and the efficient process integration.
With the help of a model-based solution approach, the effects of technical changes
can be assessed more quickly and profound development decisions can be made. This
dissertation describes a methodology for the development of model-based effect
chain analyses for the evaluation of technical changes. Model-based effect chain
analyses can be used to identify model elements that are directly or indirectly
affected by the change. The data model is analysed using query languages and the
effects are quantified using integrated metrics. The results of the impact chain
analysis are provided in role-specific views, which ensures needs-based decision
support. The validation based on four industrial case studies demonstrates the
practical applicability of the methodology. The methodology combines change management
with the advantages of model-based system development and thus forms a synergetic
new area of research.
author:
- first_name: Dominik
full_name: Wiechel, Dominik
last_name: Wiechel
citation:
ama: Wiechel D. Modellbasierte Wirkkettenanalyse Zur Bewertung Technischer Änderungen.
Vol 432.; 2025. doi:10.17619/UNIPB/1-2473
apa: Wiechel, D. (2025). Modellbasierte Wirkkettenanalyse zur Bewertung technischer
Änderungen (Vol. 432). https://doi.org/10.17619/UNIPB/1-2473
bibtex: '@book{Wiechel_2025, place={Paderborn}, series={Verlagsschriftenreihe des
Heinz Nixdorf Instituts}, title={Modellbasierte Wirkkettenanalyse zur Bewertung
technischer Änderungen}, volume={432}, DOI={10.17619/UNIPB/1-2473},
author={Wiechel, Dominik}, year={2025}, collection={Verlagsschriftenreihe des
Heinz Nixdorf Instituts} }'
chicago: Wiechel, Dominik. Modellbasierte Wirkkettenanalyse Zur Bewertung Technischer
Änderungen. Vol. 432. Verlagsschriftenreihe Des Heinz Nixdorf Instituts. Paderborn,
2025. https://doi.org/10.17619/UNIPB/1-2473.
ieee: D. Wiechel, Modellbasierte Wirkkettenanalyse zur Bewertung technischer
Änderungen, vol. 432. Paderborn, 2025.
mla: Wiechel, Dominik. Modellbasierte Wirkkettenanalyse Zur Bewertung Technischer
Änderungen. 2025, doi:10.17619/UNIPB/1-2473.
short: D. Wiechel, Modellbasierte Wirkkettenanalyse Zur Bewertung Technischer Änderungen,
Paderborn, 2025.
date_created: 2026-01-06T20:20:58Z
date_updated: 2026-01-06T20:27:08Z
department:
- _id: '152'
doi: 10.17619/UNIPB/1-2473
extern: '1'
intvolume: ' 432'
language:
- iso: eng
place: Paderborn
publication_identifier:
isbn:
- 978-3-947647-51-4
issn:
- 2365-4422
publication_status: published
series_title: Verlagsschriftenreihe des Heinz Nixdorf Instituts
status: public
title: Modellbasierte Wirkkettenanalyse zur Bewertung technischer Änderungen
type: dissertation
user_id: '67161'
volume: 432
year: '2025'
...
---
_id: '62924'
author:
- first_name: Laura
full_name: Wittkopp, Laura
id: '81147'
last_name: Wittkopp
- first_name: Pascal
full_name: Pollmeier, Pascal
id: '44191'
last_name: Pollmeier
- first_name: Sabine
full_name: Fechner, Sabine
id: '54823'
last_name: Fechner
orcid: 0000-0001-5645-5870
citation:
ama: 'Wittkopp L, Pollmeier P, Fechner S. Effekte nachhaltigkeitsbezogener Kontexte
beim Chemielernen. In: Jahrestagung Der Gesellschaft Für Didaktik Der Chemie
Und Physik e.V. (GDCP). ; 2025.'
apa: Wittkopp, L., Pollmeier, P., & Fechner, S. (2025). Effekte nachhaltigkeitsbezogener
Kontexte beim Chemielernen. Jahrestagung Der Gesellschaft Für Didaktik Der
Chemie Und Physik e.V. (GDCP). Jahrestagung der Gesellschaft für Didaktik
der Chemie und Physik, Frankfurt am Main.
bibtex: '@inproceedings{Wittkopp_Pollmeier_Fechner_2025, title={Effekte nachhaltigkeitsbezogener
Kontexte beim Chemielernen}, booktitle={Jahrestagung der Gesellschaft für Didaktik
der Chemie und Physik e.V. (GDCP)}, author={Wittkopp, Laura and Pollmeier, Pascal
and Fechner, Sabine}, year={2025} }'
chicago: Wittkopp, Laura, Pascal Pollmeier, and Sabine Fechner. “Effekte Nachhaltigkeitsbezogener
Kontexte Beim Chemielernen.” In Jahrestagung Der Gesellschaft Für Didaktik
Der Chemie Und Physik e.V. (GDCP), 2025.
ieee: L. Wittkopp, P. Pollmeier, and S. Fechner, “Effekte nachhaltigkeitsbezogener
Kontexte beim Chemielernen,” presented at the Jahrestagung der Gesellschaft für
Didaktik der Chemie und Physik, Frankfurt am Main, 2025.
mla: Wittkopp, Laura, et al. “Effekte Nachhaltigkeitsbezogener Kontexte Beim Chemielernen.”
Jahrestagung Der Gesellschaft Für Didaktik Der Chemie Und Physik e.V. (GDCP),
2025.
short: 'L. Wittkopp, P. Pollmeier, S. Fechner, in: Jahrestagung Der Gesellschaft
Für Didaktik Der Chemie Und Physik e.V. (GDCP), 2025.'
conference:
end_date: 2025-09-11
location: Frankfurt am Main
name: Jahrestagung der Gesellschaft für Didaktik der Chemie und Physik
start_date: 2025-09-08
date_created: 2025-12-05T13:41:11Z
date_updated: 2026-01-06T16:12:06Z
department:
- _id: '386'
language:
- iso: eng
publication: Jahrestagung der Gesellschaft für Didaktik der Chemie und Physik e.V.
(GDCP)
status: public
title: Effekte nachhaltigkeitsbezogener Kontexte beim Chemielernen
type: conference_abstract
user_id: '81147'
year: '2025'
...
---
_id: '63510'
abstract:
- lang: eng
text: It has been shown recently that optimal control problems with the dynamical
constraint given by a second order system admit a regular Lagrangian formulation.
This implies that the optimality conditions can be obtained in a new form based
on the variational approach. In this paper we extend the first order necessary
optimality conditions obtained previously to second order optimality conditions.
This results in a complete characterization of the optimality conditions in a
new Lagrangian form.
author:
- first_name: Michael
full_name: Konopik, Michael
last_name: Konopik
- first_name: Sigrid
full_name: Leyendecker, Sigrid
last_name: Leyendecker
- first_name: Sofya
full_name: Maslovskaya, Sofya
last_name: Maslovskaya
- first_name: Sina Ober-Blöbaum
full_name: Sina Ober-Blöbaum, Sina Ober-Blöbaum
last_name: Sina Ober-Blöbaum
- first_name: Rodrigo T. Sato Martín de
full_name: Almagro, Rodrigo T. Sato Martín de
last_name: Almagro
citation:
ama: Konopik M, Leyendecker S, Maslovskaya S, Sina Ober-Blöbaum SO-B, Almagro RTSM
de. Second order optimality conditions in a new Lagrangian formulation for optimal
control problems. arXiv:250706024. Published online 2025.
apa: Konopik, M., Leyendecker, S., Maslovskaya, S., Sina Ober-Blöbaum, S. O.-B.,
& Almagro, R. T. S. M. de. (2025). Second order optimality conditions in a
new Lagrangian formulation for optimal control problems. In arXiv:2507.06024.
bibtex: '@article{Konopik_Leyendecker_Maslovskaya_Sina Ober-Blöbaum_Almagro_2025,
title={Second order optimality conditions in a new Lagrangian formulation for
optimal control problems}, journal={arXiv:2507.06024}, author={Konopik, Michael
and Leyendecker, Sigrid and Maslovskaya, Sofya and Sina Ober-Blöbaum, Sina Ober-Blöbaum
and Almagro, Rodrigo T. Sato Martín de}, year={2025} }'
chicago: Konopik, Michael, Sigrid Leyendecker, Sofya Maslovskaya, Sina Ober-Blöbaum
Sina Ober-Blöbaum, and Rodrigo T. Sato Martín de Almagro. “Second Order Optimality
Conditions in a New Lagrangian Formulation for Optimal Control Problems.” ArXiv:2507.06024,
2025.
ieee: M. Konopik, S. Leyendecker, S. Maslovskaya, S. O.-B. Sina Ober-Blöbaum, and
R. T. S. M. de Almagro, “Second order optimality conditions in a new Lagrangian
formulation for optimal control problems,” arXiv:2507.06024. 2025.
mla: Konopik, Michael, et al. “Second Order Optimality Conditions in a New Lagrangian
Formulation for Optimal Control Problems.” ArXiv:2507.06024, 2025.
short: M. Konopik, S. Leyendecker, S. Maslovskaya, S.O.-B. Sina Ober-Blöbaum, R.T.S.M.
de Almagro, ArXiv:2507.06024 (2025).
date_created: 2026-01-06T18:28:18Z
date_updated: 2026-01-06T18:29:15Z
department:
- _id: '636'
external_id:
arxiv:
- '2507.06024'
language:
- iso: eng
publication: arXiv:2507.06024
status: public
title: Second order optimality conditions in a new Lagrangian formulation for optimal
control problems
type: preprint
user_id: '87909'
year: '2025'
...
---
_id: '59797'
author:
- first_name: Michael
full_name: Konopik, Michael
last_name: Konopik
- first_name: Rodrigo
full_name: T. Sato Martín de Almagro, Rodrigo
last_name: T. Sato Martín de Almagro
- first_name: Sofya
full_name: Maslovskaya, Sofya
id: '87909'
last_name: Maslovskaya
- first_name: Sina
full_name: Ober-Blöbaum, Sina
id: '16494'
last_name: Ober-Blöbaum
- first_name: Sigrid
full_name: Leyendecker, Sigrid
last_name: Leyendecker
citation:
ama: Konopik M, T. Sato Martín de Almagro R, Maslovskaya S, Ober-Blöbaum S, Leyendecker
S. Variational integrators for a new Lagrangian approach to control affine systems
with a quadratic Lagrange term. Journal of Nonlinear Science. 2025;36(11).
doi:10.1007/s00332-025-10229-5
apa: Konopik, M., T. Sato Martín de Almagro, R., Maslovskaya, S., Ober-Blöbaum,
S., & Leyendecker, S. (2025). Variational integrators for a new Lagrangian
approach to control affine systems with a quadratic Lagrange term. Journal
of Nonlinear Science, 36(11). https://doi.org/10.1007/s00332-025-10229-5
bibtex: '@article{Konopik_T. Sato Martín de Almagro_Maslovskaya_Ober-Blöbaum_Leyendecker_2025,
title={Variational integrators for a new Lagrangian approach to control affine
systems with a quadratic Lagrange term}, volume={36}, DOI={10.1007/s00332-025-10229-5},
number={11}, journal={Journal of Nonlinear Science}, author={Konopik, Michael
and T. Sato Martín de Almagro, Rodrigo and Maslovskaya, Sofya and Ober-Blöbaum,
Sina and Leyendecker, Sigrid}, year={2025} }'
chicago: Konopik, Michael, Rodrigo T. Sato Martín de Almagro, Sofya Maslovskaya,
Sina Ober-Blöbaum, and Sigrid Leyendecker. “Variational Integrators for a New
Lagrangian Approach to Control Affine Systems with a Quadratic Lagrange Term.”
Journal of Nonlinear Science 36, no. 11 (2025). https://doi.org/10.1007/s00332-025-10229-5.
ieee: 'M. Konopik, R. T. Sato Martín de Almagro, S. Maslovskaya, S. Ober-Blöbaum,
and S. Leyendecker, “Variational integrators for a new Lagrangian approach to
control affine systems with a quadratic Lagrange term,” Journal of Nonlinear
Science, vol. 36, no. 11, 2025, doi: 10.1007/s00332-025-10229-5.'
mla: Konopik, Michael, et al. “Variational Integrators for a New Lagrangian Approach
to Control Affine Systems with a Quadratic Lagrange Term.” Journal of Nonlinear
Science, vol. 36, no. 11, 2025, doi:10.1007/s00332-025-10229-5.
short: M. Konopik, R. T. Sato Martín de Almagro, S. Maslovskaya, S. Ober-Blöbaum,
S. Leyendecker, Journal of Nonlinear Science 36 (2025).
date_created: 2025-05-05T09:35:31Z
date_updated: 2026-01-06T18:26:57Z
department:
- _id: '636'
doi: 10.1007/s00332-025-10229-5
intvolume: ' 36'
issue: '11'
language:
- iso: eng
publication: Journal of Nonlinear Science
status: public
title: Variational integrators for a new Lagrangian approach to control affine systems
with a quadratic Lagrange term
type: journal_article
user_id: '87909'
volume: 36
year: '2025'
...
---
_id: '59799'
author:
- first_name: Michael
full_name: Konopik, Michael
last_name: Konopik
- first_name: Sigrid
full_name: Leyendecker, Sigrid
last_name: Leyendecker
- first_name: Sofya
full_name: Maslovskaya, Sofya
id: '87909'
last_name: Maslovskaya
- first_name: Sina
full_name: Ober-Blöbaum, Sina
id: '16494'
last_name: Ober-Blöbaum
- first_name: Rodrigo
full_name: T. Sato Martín de Almagro, Rodrigo
last_name: T. Sato Martín de Almagro
citation:
ama: Konopik M, Leyendecker S, Maslovskaya S, Ober-Blöbaum S, T. Sato Martín de
Almagro R. A new Lagrangian approach to optimal control of second-order systems.
Nonlinearity. 2025;38(11). doi:10.1088/1361-6544/ae1d08
apa: Konopik, M., Leyendecker, S., Maslovskaya, S., Ober-Blöbaum, S., & T. Sato
Martín de Almagro, R. (2025). A new Lagrangian approach to optimal control of
second-order systems. Nonlinearity, 38(11). https://doi.org/10.1088/1361-6544/ae1d08
bibtex: '@article{Konopik_Leyendecker_Maslovskaya_Ober-Blöbaum_T. Sato Martín de
Almagro_2025, title={A new Lagrangian approach to optimal control of second-order
systems}, volume={38}, DOI={10.1088/1361-6544/ae1d08},
number={11}, journal={Nonlinearity}, author={Konopik, Michael and Leyendecker,
Sigrid and Maslovskaya, Sofya and Ober-Blöbaum, Sina and T. Sato Martín de Almagro,
Rodrigo}, year={2025} }'
chicago: Konopik, Michael, Sigrid Leyendecker, Sofya Maslovskaya, Sina Ober-Blöbaum,
and Rodrigo T. Sato Martín de Almagro. “A New Lagrangian Approach to Optimal Control
of Second-Order Systems.” Nonlinearity 38, no. 11 (2025). https://doi.org/10.1088/1361-6544/ae1d08.
ieee: 'M. Konopik, S. Leyendecker, S. Maslovskaya, S. Ober-Blöbaum, and R. T. Sato
Martín de Almagro, “A new Lagrangian approach to optimal control of second-order
systems,” Nonlinearity, vol. 38, no. 11, 2025, doi: 10.1088/1361-6544/ae1d08.'
mla: Konopik, Michael, et al. “A New Lagrangian Approach to Optimal Control of Second-Order
Systems.” Nonlinearity, vol. 38, no. 11, 2025, doi:10.1088/1361-6544/ae1d08.
short: M. Konopik, S. Leyendecker, S. Maslovskaya, S. Ober-Blöbaum, R. T. Sato Martín
de Almagro, Nonlinearity 38 (2025).
date_created: 2025-05-05T09:37:50Z
date_updated: 2026-01-06T18:24:40Z
department:
- _id: '636'
doi: 10.1088/1361-6544/ae1d08
intvolume: ' 38'
issue: '11'
language:
- iso: eng
publication: Nonlinearity
status: public
title: A new Lagrangian approach to optimal control of second-order systems
type: journal_article
user_id: '87909'
volume: 38
year: '2025'
...
---
_id: '63091'
abstract:
- lang: eng
text: We present the design and characterization of a guided-wave, bright, and highly
frequency non-degenerate parametric down-conversion (PDC) source in thin-film
lithium niobate. The source generates photon pairs with wavelengths of 815 nm
and 1550 nm, linking the visible wavelength regime with telecommunication wavelengths.
We confirm the high quality of the generated single photons by determining a value
for the heralded second-order correlation function as low as g_h^(2)=(6.7+/-1.1)*10^8-3).
Furthermore, we achieve a high spectral brightness of 0.44·10pairs/(smWGHz) which
is two orders of magnitude higher than sources based on weakly guiding waveguides.
The shape of the PDC spectrum and the strong agreement between the effective and
nominal bandwidth highlight our high fabrication quality of periodically poled
waveguides. The good agreement between the measured and simulated spectral characteristics
of our source demonstrates our excellent understanding of the PDC process. Our
result is a valuable step towards practical and scalable quantum communication
networks as well as photonic quantum computing.
article_number: '52729'
article_type: original
author:
- first_name: Silia
full_name: Babel, Silia
id: '63231'
last_name: Babel
orcid: https://orcid.org/0000-0002-1568-2580
- first_name: Laura
full_name: Bollmers, Laura
id: '61375'
last_name: Bollmers
- first_name: Franz
full_name: Roeder, Franz
id: '88149'
last_name: Roeder
- first_name: Werner
full_name: Ridder, Werner
id: '63574'
last_name: Ridder
- first_name: Christian
full_name: Golla, Christian
id: '40420'
last_name: Golla
- first_name: Ronja
full_name: Köthemann, Ronja
last_name: Köthemann
- first_name: Bernhard
full_name: Reineke, Bernhard
id: '29821'
last_name: Reineke
- first_name: Harald
full_name: Herrmann, Harald
id: '216'
last_name: Herrmann
- first_name: Benjamin
full_name: Brecht, Benjamin
id: '27150'
last_name: Brecht
orcid: '0000-0003-4140-0556 '
- first_name: Christof
full_name: Eigner, Christof
id: '13244'
last_name: Eigner
orcid: https://orcid.org/0000-0002-5693-3083
- first_name: Laura
full_name: Padberg, Laura
id: '40300'
last_name: Padberg
- first_name: Christine
full_name: Silberhorn, Christine
id: '26263'
last_name: Silberhorn
citation:
ama: Babel S, Bollmers L, Roeder F, et al. Ultrabright, two-color photon pair source
based on thin-film lithium niobate for bridging visible and telecom wavelengths.
Optics Express. 2025;33(25). doi:10.1364/oe.571605
apa: Babel, S., Bollmers, L., Roeder, F., Ridder, W., Golla, C., Köthemann, R.,
Reineke, B., Herrmann, H., Brecht, B., Eigner, C., Padberg, L., & Silberhorn,
C. (2025). Ultrabright, two-color photon pair source based on thin-film lithium
niobate for bridging visible and telecom wavelengths. Optics Express, 33(25),
Article 52729. https://doi.org/10.1364/oe.571605
bibtex: '@article{Babel_Bollmers_Roeder_Ridder_Golla_Köthemann_Reineke_Herrmann_Brecht_Eigner_et
al._2025, title={Ultrabright, two-color photon pair source based on thin-film
lithium niobate for bridging visible and telecom wavelengths}, volume={33}, DOI={10.1364/oe.571605}, number={2552729},
journal={Optics Express}, publisher={Optica Publishing Group}, author={Babel,
Silia and Bollmers, Laura and Roeder, Franz and Ridder, Werner and Golla, Christian
and Köthemann, Ronja and Reineke, Bernhard and Herrmann, Harald and Brecht, Benjamin
and Eigner, Christof and et al.}, year={2025} }'
chicago: Babel, Silia, Laura Bollmers, Franz Roeder, Werner Ridder, Christian Golla,
Ronja Köthemann, Bernhard Reineke, et al. “Ultrabright, Two-Color Photon Pair
Source Based on Thin-Film Lithium Niobate for Bridging Visible and Telecom Wavelengths.”
Optics Express 33, no. 25 (2025). https://doi.org/10.1364/oe.571605.
ieee: 'S. Babel et al., “Ultrabright, two-color photon pair source based
on thin-film lithium niobate for bridging visible and telecom wavelengths,” Optics
Express, vol. 33, no. 25, Art. no. 52729, 2025, doi: 10.1364/oe.571605.'
mla: Babel, Silia, et al. “Ultrabright, Two-Color Photon Pair Source Based on Thin-Film
Lithium Niobate for Bridging Visible and Telecom Wavelengths.” Optics Express,
vol. 33, no. 25, 52729, Optica Publishing Group, 2025, doi:10.1364/oe.571605.
short: S. Babel, L. Bollmers, F. Roeder, W. Ridder, C. Golla, R. Köthemann, B. Reineke,
H. Herrmann, B. Brecht, C. Eigner, L. Padberg, C. Silberhorn, Optics Express 33
(2025).
date_created: 2025-12-15T07:20:36Z
date_updated: 2026-01-07T11:28:35Z
department:
- _id: '288'
- _id: '623'
doi: 10.1364/oe.571605
intvolume: ' 33'
issue: '25'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://opg.optica.org/oe/fulltext.cfm?uri=oe-33-25-52729
oa: '1'
publication: Optics Express
publication_identifier:
issn:
- 1094-4087
publication_status: published
publisher: Optica Publishing Group
status: public
title: Ultrabright, two-color photon pair source based on thin-film lithium niobate
for bridging visible and telecom wavelengths
type: journal_article
user_id: '63231'
volume: 33
year: '2025'
...
---
_id: '62713'
abstract:
- lang: eng
text: Periodically poled thin-film lithium niobate (TFLN) crystals are the fundamental
building block for highly-efficient quantum light sources and frequency converters.
The efficiency of these devices is strongly dependent on the interaction length
between the light and the nonlinear material, scaling quadratically with this
parameter. Nevertheless, the fabrication of long, continuously poled areas in
TFLN remains challenging, the length of continuously poled areas rarely exceeds
10 mm. In this work, we demonstrate a significant progress in this field achieving
the periodic poling of continuous poled areas of 70 mm length with a 3 μm poling
period and a close to 50 % duty cycle. We compare two poling electrode design
approaches to fabricate long, continuous poled areas. The first approach involves
the poling of a single, continuous 70 mm long electrode. The second utilize a
segmented approach including the poling of more than 20 individual sections forming
together a 70 mm long poling area with no stitching errors. While the continuous
electrode allows for faster fabrication, the segmented approach allows to individually
optimize the poling resulting in less duty cycle variation. A detailed analysis
of the periodic poling results reveals that the results of both are consistent
with previously reported poling outcomes for shorter devices. Thus, we demonstrate
wafer-scale periodic poling exceeding chiplet-size without any loss in the periodic
poling quality. Our work presents a key step towards highly-efficient, narrow-bandwidth
and low-pump power nonlinear optical devices.
article_type: original
author:
- first_name: Laura
full_name: Bollmers, Laura
id: '61375'
last_name: Bollmers
- first_name: Noah
full_name: Spiegelberg, Noah
last_name: Spiegelberg
- first_name: Michael
full_name: Rüsing, Michael
id: '22501'
last_name: Rüsing
orcid: 0000-0003-4682-4577
- first_name: Christof
full_name: Eigner, Christof
id: '13244'
last_name: Eigner
orcid: https://orcid.org/0000-0002-5693-3083
- first_name: Laura
full_name: Padberg, Laura
id: '40300'
last_name: Padberg
- first_name: Christine
full_name: Silberhorn, Christine
id: '26263'
last_name: Silberhorn
citation:
ama: Bollmers L, Spiegelberg N, Rüsing M, Eigner C, Padberg L, Silberhorn C. Segmented
finger electrodes to optimize ultra-long continuous wafer-scale periodic poling
in thin-film lithium niobate. Nanophotonics. 2025;14:4761. doi:10.1515/nanoph-2025-0461
apa: Bollmers, L., Spiegelberg, N., Rüsing, M., Eigner, C., Padberg, L., & Silberhorn,
C. (2025). Segmented finger electrodes to optimize ultra-long continuous wafer-scale
periodic poling in thin-film lithium niobate. Nanophotonics, 14,
4761. https://doi.org/10.1515/nanoph-2025-0461
bibtex: '@article{Bollmers_Spiegelberg_Rüsing_Eigner_Padberg_Silberhorn_2025, title={Segmented
finger electrodes to optimize ultra-long continuous wafer-scale periodic poling
in thin-film lithium niobate}, volume={14}, DOI={10.1515/nanoph-2025-0461},
journal={Nanophotonics}, publisher={Walter de Gruyter GmbH}, author={Bollmers,
Laura and Spiegelberg, Noah and Rüsing, Michael and Eigner, Christof and Padberg,
Laura and Silberhorn, Christine}, year={2025}, pages={4761} }'
chicago: 'Bollmers, Laura, Noah Spiegelberg, Michael Rüsing, Christof Eigner, Laura
Padberg, and Christine Silberhorn. “Segmented Finger Electrodes to Optimize Ultra-Long
Continuous Wafer-Scale Periodic Poling in Thin-Film Lithium Niobate.” Nanophotonics
14 (2025): 4761. https://doi.org/10.1515/nanoph-2025-0461.'
ieee: 'L. Bollmers, N. Spiegelberg, M. Rüsing, C. Eigner, L. Padberg, and C. Silberhorn,
“Segmented finger electrodes to optimize ultra-long continuous wafer-scale periodic
poling in thin-film lithium niobate,” Nanophotonics, vol. 14, p. 4761,
2025, doi: 10.1515/nanoph-2025-0461.'
mla: Bollmers, Laura, et al. “Segmented Finger Electrodes to Optimize Ultra-Long
Continuous Wafer-Scale Periodic Poling in Thin-Film Lithium Niobate.” Nanophotonics,
vol. 14, Walter de Gruyter GmbH, 2025, p. 4761, doi:10.1515/nanoph-2025-0461.
short: L. Bollmers, N. Spiegelberg, M. Rüsing, C. Eigner, L. Padberg, C. Silberhorn,
Nanophotonics 14 (2025) 4761.
date_created: 2025-12-01T08:45:07Z
date_updated: 2026-01-07T12:06:29Z
department:
- _id: '15'
- _id: '288'
- _id: '623'
doi: 10.1515/nanoph-2025-0461
intvolume: ' 14'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.1515/nanoph-2025-0461
oa: '1'
page: '4761'
publication: Nanophotonics
publication_identifier:
issn:
- 2192-8606
- 2192-8614
publication_status: published
publisher: Walter de Gruyter GmbH
quality_controlled: '1'
status: public
title: Segmented finger electrodes to optimize ultra-long continuous wafer-scale periodic
poling in thin-film lithium niobate
type: journal_article
user_id: '22501'
volume: 14
year: '2025'
...
---
_id: '63518'
author:
- first_name: Ruth Edith
full_name: Hagengruber, Ruth Edith
id: '198'
last_name: Hagengruber
orcid: https://orcid.org/0000-0003-3360-6335
citation:
ama: Hagengruber RE. Eine Demokratie, die das Recht der Frauen nicht verwirklicht,
ist nichtig". Das politische Meisterstücke der Olympe de Gouges (1748-1793). ZDPE.
2025;3.
apa: Hagengruber, R. E. (2025). Eine Demokratie, die das Recht der Frauen nicht
verwirklicht, ist nichtig". Das politische Meisterstücke der Olympe de Gouges
(1748-1793). ZDPE, 3.
bibtex: '@article{Hagengruber_2025, title={Eine Demokratie, die das Recht der Frauen
nicht verwirklicht, ist nichtig". Das politische Meisterstücke der Olympe de Gouges
(1748-1793)}, volume={3}, journal={ZDPE}, publisher={Bettina Bussmann und Vanessa
Albus}, author={Hagengruber, Ruth Edith}, year={2025} }'
chicago: Hagengruber, Ruth Edith. “Eine Demokratie, die das Recht der Frauen nicht
verwirklicht, ist nichtig". Das politische Meisterstücke der Olympe de Gouges
(1748-1793).” ZDPE 3 (2025).
ieee: R. E. Hagengruber, “Eine Demokratie, die das Recht der Frauen nicht verwirklicht,
ist nichtig". Das politische Meisterstücke der Olympe de Gouges (1748-1793),”
ZDPE, vol. 3, 2025.
mla: Hagengruber, Ruth Edith. “Eine Demokratie, die das Recht der Frauen nicht verwirklicht,
ist nichtig". Das politische Meisterstücke der Olympe de Gouges (1748-1793).”
ZDPE, vol. 3, Bettina Bussmann und Vanessa Albus, 2025.
short: R.E. Hagengruber, ZDPE 3 (2025).
date_created: 2026-01-07T12:35:34Z
date_updated: 2026-01-07T12:35:42Z
department:
- _id: '519'
intvolume: ' 3'
language:
- iso: ger
publication: ZDPE
publication_status: published
publisher: Bettina Bussmann und Vanessa Albus
status: public
title: Eine Demokratie, die das Recht der Frauen nicht verwirklicht, ist nichtig".
Das politische Meisterstücke der Olympe de Gouges (1748-1793)
type: journal_article
user_id: '91827'
volume: 3
year: '2025'
...
---
_id: '63524'
abstract:
- lang: eng
text: Recommendation systems are essential for delivering personalized content across
e-commerce and streaming services. However, traditional methods often fail in
cold-start scenarios where new items lack prior interactions. Recent advances
in large language models (LLMs) offer a promising alternative. In this paper,
we adopt the retrieve-and-recommend framework and propose to fine-tune the LLM
jointly on warm-and cold-start next-item recommendation tasks, thus, mitigating
the need for separate models for both item types. We computationally compare zero-shot
prompting, in-context learning, and fine-tuning using the same LLM backbone, and
benchmark them against strong PLM-based baselines. Our findings provide practical
insights into the trade-offs between accuracy and computational cost of these
methods for next-item recommendation. To enhance reproducibility, we release the
source code under https://github. com/HayaHalimeh/LLMs-For-Next-Item-Recommendation.git.
author:
- first_name: Haya
full_name: Halimeh, Haya
id: '87673'
last_name: Halimeh
- first_name: Florian
full_name: Freese, Florian
last_name: Freese
- first_name: Oliver
full_name: Müller, Oliver
last_name: Müller
citation:
ama: 'Halimeh H, Freese F, Müller O. LLMs For Warm and Cold Next-Item Recommendation:
A Comparative Study across Zero-Shot Prompting, In-Context Learning and Fine-Tuning.
In: International Conference on Information Systems Development. University
of Gdansk, Department of Business Informatics & University of Belgrade, Faculty
of Organizational Sciences; 2025. doi:10.62036/isd.2025.68'
apa: 'Halimeh, H., Freese, F., & Müller, O. (2025). LLMs For Warm and Cold Next-Item
Recommendation: A Comparative Study across Zero-Shot Prompting, In-Context Learning
and Fine-Tuning. International Conference on Information Systems Development.
https://doi.org/10.62036/isd.2025.68'
bibtex: '@inproceedings{Halimeh_Freese_Müller_2025, title={LLMs For Warm and Cold
Next-Item Recommendation: A Comparative Study across Zero-Shot Prompting, In-Context
Learning and Fine-Tuning}, DOI={10.62036/isd.2025.68},
booktitle={International Conference on Information Systems Development}, publisher={University
of Gdansk, Department of Business Informatics & University of Belgrade, Faculty
of Organizational Sciences}, author={Halimeh, Haya and Freese, Florian and Müller,
Oliver}, year={2025} }'
chicago: 'Halimeh, Haya, Florian Freese, and Oliver Müller. “LLMs For Warm and Cold
Next-Item Recommendation: A Comparative Study across Zero-Shot Prompting, In-Context
Learning and Fine-Tuning.” In International Conference on Information Systems
Development. University of Gdansk, Department of Business Informatics &
University of Belgrade, Faculty of Organizational Sciences, 2025. https://doi.org/10.62036/isd.2025.68.'
ieee: 'H. Halimeh, F. Freese, and O. Müller, “LLMs For Warm and Cold Next-Item Recommendation:
A Comparative Study across Zero-Shot Prompting, In-Context Learning and Fine-Tuning,”
2025, doi: 10.62036/isd.2025.68.'
mla: 'Halimeh, Haya, et al. “LLMs For Warm and Cold Next-Item Recommendation: A
Comparative Study across Zero-Shot Prompting, In-Context Learning and Fine-Tuning.”
International Conference on Information Systems Development, University
of Gdansk, Department of Business Informatics & University of Belgrade, Faculty
of Organizational Sciences, 2025, doi:10.62036/isd.2025.68.'
short: 'H. Halimeh, F. Freese, O. Müller, in: International Conference on Information
Systems Development, University of Gdansk, Department of Business Informatics
& University of Belgrade, Faculty of Organizational Sciences, 2025.'
date_created: 2026-01-07T13:36:53Z
date_updated: 2026-01-07T13:47:43Z
department:
- _id: '195'
- _id: '196'
doi: 10.62036/isd.2025.68
language:
- iso: eng
main_file_link:
- open_access: '1'
oa: '1'
publication: International Conference on Information Systems Development
publication_identifier:
issn:
- 2938-5202
publication_status: published
publisher: University of Gdansk, Department of Business Informatics & University of
Belgrade, Faculty of Organizational Sciences
status: public
title: 'LLMs For Warm and Cold Next-Item Recommendation: A Comparative Study across
Zero-Shot Prompting, In-Context Learning and Fine-Tuning'
type: conference
user_id: '87673'
year: '2025'
...
---
_id: '63523'
abstract:
- lang: eng
text: 'Data spaces have become a strategic pillar of Europe''s digital agenda, enabling
sovereign, legally compliant data sharing within decentralized ecosystems. As
data space initiatives evolve, personalized recommendations are increasingly recognized
as key use cases. However, traditional recommendation approaches typically rely
on centralized aggregation of user behavior data-directly conflicting with the
core ethos of data spaces: sovereignty, privacy, and trust. Federated recommendation
systems offer a promising alternative by training models locally and exchanging
only intermediate parameters to build a global model. Despite this potential,
the integration of federated recommendation techniques and data space architectures
remains largely underexplored in research and practice. This paper addresses this
gap by designing and evaluating a prototype of a federated recommendation system
specifically tailored for data spaces and compliant with their underlying infrastructure.
Our findings highlight the viability of developing privacy-preserving, collaborative
recommendation systems within data spaces, and contribute to the broader adoption
of AI across these emerging ecosystems.'
author:
- first_name: Haya
full_name: Halimeh, Haya
id: '87673'
last_name: Halimeh
- first_name: Philipp
full_name: zur Heiden, Philipp
id: '64394'
last_name: zur Heiden
citation:
ama: 'Halimeh H, zur Heiden P. Preserving Sovereignty and Privacy for Personalization:
Designing a Federated Recommendation System for Data Spaces. In: 2025 27th
International Conference on Business Informatics (CBI). IEEE; 2025. doi:10.1109/cbi68102.2025.00019'
apa: 'Halimeh, H., & zur Heiden, P. (2025). Preserving Sovereignty and Privacy
for Personalization: Designing a Federated Recommendation System for Data Spaces.
2025 27th International Conference on Business Informatics (CBI). https://doi.org/10.1109/cbi68102.2025.00019'
bibtex: '@inproceedings{Halimeh_zur Heiden_2025, title={Preserving Sovereignty and
Privacy for Personalization: Designing a Federated Recommendation System for Data
Spaces}, DOI={10.1109/cbi68102.2025.00019},
booktitle={2025 27th International Conference on Business Informatics (CBI)},
publisher={IEEE}, author={Halimeh, Haya and zur Heiden, Philipp}, year={2025}
}'
chicago: 'Halimeh, Haya, and Philipp zur Heiden. “Preserving Sovereignty and Privacy
for Personalization: Designing a Federated Recommendation System for Data Spaces.”
In 2025 27th International Conference on Business Informatics (CBI). IEEE,
2025. https://doi.org/10.1109/cbi68102.2025.00019.'
ieee: 'H. Halimeh and P. zur Heiden, “Preserving Sovereignty and Privacy for Personalization:
Designing a Federated Recommendation System for Data Spaces,” 2025, doi: 10.1109/cbi68102.2025.00019.'
mla: 'Halimeh, Haya, and Philipp zur Heiden. “Preserving Sovereignty and Privacy
for Personalization: Designing a Federated Recommendation System for Data Spaces.”
2025 27th International Conference on Business Informatics (CBI), IEEE,
2025, doi:10.1109/cbi68102.2025.00019.'
short: 'H. Halimeh, P. zur Heiden, in: 2025 27th International Conference on Business
Informatics (CBI), IEEE, 2025.'
date_created: 2026-01-07T13:34:02Z
date_updated: 2026-01-07T13:49:45Z
department:
- _id: '195'
- _id: '196'
doi: 10.1109/cbi68102.2025.00019
language:
- iso: eng
main_file_link:
- open_access: '1'
oa: '1'
publication: 2025 27th International Conference on Business Informatics (CBI)
publication_status: published
publisher: IEEE
status: public
title: 'Preserving Sovereignty and Privacy for Personalization: Designing a Federated
Recommendation System for Data Spaces'
type: conference
user_id: '87673'
year: '2025'
...
---
_id: '63525'
abstract:
- lang: eng
text: "Recommender systems (RS) can support sustainable development by steering
users toward more sustainable choices. Sustainability-aware explanations represent
one avenue for contributing to this goal by foregrounding the environmental and
social aspects of the recommended products or services. This paper advances the
line of research on sustainability-aware explanations by integrating nudging mechanisms
into their design and by evaluating their effectiveness through a randomized between-subjects
online vignette experiment across two item domains (). Our findings offer actionable
design guidelines for building RS that foster sustainability-aware decision making
and enrich the empirical foundation for impact-oriented research on explanation
in RS.\r\n"
author:
- first_name: Haya
full_name: Halimeh, Haya
id: '87673'
last_name: Halimeh
- first_name: Oliver
full_name: Müller, Oliver
id: '72849'
last_name: Müller
citation:
ama: 'Halimeh H, Müller O. Towards Greener Choices: Decision Information Nudging
for Sustainability-Aware Recommender Explanations. In: ; 2025. doi:10.1007/978-3-032-13342-7'
apa: 'Halimeh, H., & Müller, O. (2025). Towards Greener Choices: Decision
Information Nudging for Sustainability-Aware Recommender Explanations. The
Second International Workshop on Recommender Systems for Sustainability and Social
Good, RecSoGood 2025, Prague, Czech Republic. https://doi.org/10.1007/978-3-032-13342-7'
bibtex: '@inproceedings{Halimeh_Müller_2025, title={Towards Greener Choices: Decision
Information Nudging for Sustainability-Aware Recommender Explanations}, DOI={10.1007/978-3-032-13342-7},
author={Halimeh, Haya and Müller, Oliver}, year={2025} }'
chicago: 'Halimeh, Haya, and Oliver Müller. “Towards Greener Choices: Decision Information
Nudging for Sustainability-Aware Recommender Explanations,” 2025. https://doi.org/10.1007/978-3-032-13342-7.'
ieee: 'H. Halimeh and O. Müller, “Towards Greener Choices: Decision Information
Nudging for Sustainability-Aware Recommender Explanations,” presented at the The
Second International Workshop on Recommender Systems for Sustainability and Social
Good, RecSoGood 2025, Prague, Czech Republic, 2025, doi: 10.1007/978-3-032-13342-7.'
mla: 'Halimeh, Haya, and Oliver Müller. Towards Greener Choices: Decision Information
Nudging for Sustainability-Aware Recommender Explanations. 2025, doi:10.1007/978-3-032-13342-7.'
short: 'H. Halimeh, O. Müller, in: 2025.'
conference:
location: Prague, Czech Republic
name: ' The Second International Workshop on Recommender Systems for Sustainability
and Social Good, RecSoGood 2025'
start_date: 2025-09-26
date_created: 2026-01-07T13:40:05Z
date_updated: 2026-01-07T13:46:50Z
department:
- _id: '195'
- _id: '196'
doi: 10.1007/978-3-032-13342-7
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://link.springer.com/book/10.1007/978-3-032-13342-7
oa: '1'
status: public
title: 'Towards Greener Choices: Decision Information Nudging for Sustainability-Aware
Recommender Explanations'
type: conference
user_id: '87673'
year: '2025'
...
---
_id: '61922'
abstract:
- lang: eng
text: "We present an extremely simple polynomial-space exponential-time\r\n$(1-\\varepsilon)$-approximation
algorithm for MAX-k-SAT that is (slightly)\r\nfaster than the previous known polynomial-space
$(1-\\varepsilon)$-approximation\r\nalgorithms by Hirsch (Discrete Applied Mathematics,
2003) and Escoffier,\r\nPaschos and Tourniaire (Theoretical Computer Science,
2014). Our algorithm\r\nrepeatedly samples an assignment uniformly at random until
finding an\r\nassignment that satisfies a large enough fraction of clauses. Surprisingly,
we\r\ncan show the efficiency of this simpler approach by proving that in any\r\ninstance
of MAX-k-SAT (or more generally any instance of MAXCSP), an\r\nexponential number
of assignments satisfy a fraction of clauses close to the\r\noptimal value."
author:
- first_name: Harry
full_name: Buhrman, Harry
last_name: Buhrman
- first_name: Sevag
full_name: Gharibian, Sevag
id: '71541'
last_name: Gharibian
orcid: 0000-0002-9992-3379
- first_name: Zeph
full_name: Landau, Zeph
last_name: Landau
- first_name: François Le
full_name: Gall, François Le
last_name: Gall
- first_name: Norbert
full_name: Schuch, Norbert
last_name: Schuch
- first_name: Suguru
full_name: Tamaki, Suguru
last_name: Tamaki
citation:
ama: Buhrman H, Gharibian S, Landau Z, Gall FL, Schuch N, Tamaki S. A Simpler Exponential-Time
Approximation Algorithm for MAX-k-SAT. SIAM Symposium on Simplicity in Algorithms
(SOSA).
apa: Buhrman, H., Gharibian, S., Landau, Z., Gall, F. L., Schuch, N., & Tamaki,
S. (n.d.). A Simpler Exponential-Time Approximation Algorithm for MAX-k-SAT. In
SIAM Symposium on Simplicity in Algorithms (SOSA).
bibtex: '@article{Buhrman_Gharibian_Landau_Gall_Schuch_Tamaki, title={A Simpler
Exponential-Time Approximation Algorithm for MAX-k-SAT}, journal={SIAM Symposium
on Simplicity in Algorithms (SOSA)}, author={Buhrman, Harry and Gharibian, Sevag
and Landau, Zeph and Gall, François Le and Schuch, Norbert and Tamaki, Suguru}
}'
chicago: Buhrman, Harry, Sevag Gharibian, Zeph Landau, François Le Gall, Norbert
Schuch, and Suguru Tamaki. “A Simpler Exponential-Time Approximation Algorithm
for MAX-k-SAT.” SIAM Symposium on Simplicity in Algorithms (SOSA), n.d.
ieee: H. Buhrman, S. Gharibian, Z. Landau, F. L. Gall, N. Schuch, and S. Tamaki,
“A Simpler Exponential-Time Approximation Algorithm for MAX-k-SAT,” SIAM Symposium
on Simplicity in Algorithms (SOSA). .
mla: Buhrman, Harry, et al. “A Simpler Exponential-Time Approximation Algorithm
for MAX-k-SAT.” SIAM Symposium on Simplicity in Algorithms (SOSA).
short: H. Buhrman, S. Gharibian, Z. Landau, F.L. Gall, N. Schuch, S. Tamaki, SIAM
Symposium on Simplicity in Algorithms (SOSA) (n.d.).
date_created: 2025-10-22T09:33:22Z
date_updated: 2026-01-07T14:26:56Z
department:
- _id: '7'
- _id: '623'
external_id:
arxiv:
- '2510.18164'
language:
- iso: eng
publication: SIAM Symposium on Simplicity in Algorithms (SOSA)
publication_status: inpress
status: public
title: A Simpler Exponential-Time Approximation Algorithm for MAX-k-SAT
type: preprint
user_id: '71541'
year: '2025'
...
---
_id: '63026'
author:
- first_name: Maike
full_name: Althaus, Maike
id: '61896'
last_name: Althaus
- first_name: Daniel
full_name: Beverungen, Daniel
id: '59677'
last_name: Beverungen
- first_name: Beate
full_name: Flath, Beate
id: '58896'
last_name: Flath
orcid: https://orcid.org/0000-0002-1648-0796
- first_name: Haya
full_name: Halimeh, Haya
id: '87673'
last_name: Halimeh
- first_name: Philipp
full_name: Hansmeier, Philipp
id: '55603'
last_name: Hansmeier
- first_name: Philipp
full_name: zur Heiden, Philipp
id: '64394'
last_name: zur Heiden
- first_name: Dennis
full_name: Kundisch, Dennis
id: '21117'
last_name: Kundisch
- first_name: Michelle
full_name: Müller, Michelle
id: '50286'
last_name: Müller
- first_name: Oliver
full_name: Müller, Oliver
id: '72849'
last_name: Müller
- first_name: Simon
full_name: Oberthür, Simon
id: '383'
last_name: Oberthür
- first_name: Christian
full_name: Vorbohle, Christian
id: '29951'
last_name: Vorbohle
- first_name: Maryam
full_name: Momen Pour Tafreshi, Maryam
last_name: Momen Pour Tafreshi
- first_name: Sebastian
full_name: Mauß, Sebastian
last_name: Mauß
- first_name: Alina
full_name: Mücke, Alina
last_name: Mücke
- first_name: Jörg
full_name: Müller, Jörg
last_name: Müller
- first_name: Malte
full_name: Peter, Malte
last_name: Peter
- first_name: Ariane
full_name: Schmitt-Chandon, Ariane
last_name: Schmitt-Chandon
- first_name: Kerstin
full_name: Sellerberg, Kerstin
last_name: Sellerberg
- first_name: Moritz
full_name: Steinhäuser, Moritz
last_name: Steinhäuser
citation:
ama: 'Althaus M, Beverungen D, Flath B, et al. Positionspapier Use Case 1: Vernetzte
Kulturplattformen.; 2025.'
apa: 'Althaus, M., Beverungen, D., Flath, B., Halimeh, H., Hansmeier, P., zur Heiden,
P., Kundisch, D., Müller, M., Müller, O., Oberthür, S., Vorbohle, C., Momen Pour
Tafreshi, M., Mauß, S., Mücke, A., Müller, J., Peter, M., Schmitt-Chandon, A.,
Sellerberg, K., & Steinhäuser, M. (2025). Positionspapier Use Case 1: Vernetzte
Kulturplattformen.'
bibtex: '@book{Althaus_Beverungen_Flath_Halimeh_Hansmeier_zur Heiden_Kundisch_Müller_Müller_Oberthür_et
al._2025, place={Universität Paderborn, SICP}, title={Positionspapier Use Case
1: Vernetzte Kulturplattformen}, author={Althaus, Maike and Beverungen, Daniel
and Flath, Beate and Halimeh, Haya and Hansmeier, Philipp and zur Heiden, Philipp
and Kundisch, Dennis and Müller, Michelle and Müller, Oliver and Oberthür, Simon
and et al.}, year={2025} }'
chicago: 'Althaus, Maike, Daniel Beverungen, Beate Flath, Haya Halimeh, Philipp
Hansmeier, Philipp zur Heiden, Dennis Kundisch, et al. Positionspapier Use
Case 1: Vernetzte Kulturplattformen. Universität Paderborn, SICP, 2025.'
ieee: 'M. Althaus et al., Positionspapier Use Case 1: Vernetzte Kulturplattformen.
Universität Paderborn, SICP, 2025.'
mla: 'Althaus, Maike, et al. Positionspapier Use Case 1: Vernetzte Kulturplattformen.
2025.'
short: 'M. Althaus, D. Beverungen, B. Flath, H. Halimeh, P. Hansmeier, P. zur Heiden,
D. Kundisch, M. Müller, O. Müller, S. Oberthür, C. Vorbohle, M. Momen Pour Tafreshi,
S. Mauß, A. Mücke, J. Müller, M. Peter, A. Schmitt-Chandon, K. Sellerberg, M.
Steinhäuser, Positionspapier Use Case 1: Vernetzte Kulturplattformen, Universität
Paderborn, SICP, 2025.'
date_created: 2025-12-10T15:50:35Z
date_updated: 2026-01-07T13:41:32Z
department:
- _id: '276'
- _id: '526'
- _id: '196'
- _id: '735'
language:
- iso: ger
place: Universität Paderborn, SICP
project:
- _id: '160'
name: 'DatenraumKultur: Use Case 1 - Kulturplattformen - Datenraum Kultur'
publication_status: published
status: public
title: 'Positionspapier Use Case 1: Vernetzte Kulturplattformen'
type: working_paper
user_id: '87673'
year: '2025'
...
---
_id: '63527'
author:
- first_name: Mark
full_name: Henkenjohann, Mark
last_name: Henkenjohann
- first_name: Udo
full_name: Nolte, Udo
last_name: Nolte
- first_name: Julien
full_name: Jahneke, Julien
last_name: Jahneke
- first_name: Oliver
full_name: Reimer, Oliver
last_name: Reimer
- first_name: Stefan
full_name: Abrams, Stefan
last_name: Abrams
- first_name: Fabian
full_name: Sion, Fabian
last_name: Sion
- first_name: Christian
full_name: Henke, Christian
last_name: Henke
- first_name: Ansgar
full_name: Trächtler, Ansgar
id: '552'
last_name: Trächtler
- first_name: Sebastian
full_name: Schubert, Sebastian
last_name: Schubert
- first_name: Harald
full_name: Pfifer, Harald
last_name: Pfifer
citation:
ama: 'Henkenjohann M, Nolte U, Jahneke J, et al. Dynamic Wind Tunnel Testing of
an INDI-Based Flight Controller for a Tiltrotor-VTOL. In: AIAA SCITECH 2025
Forum. American Institute of Aeronautics and Astronautics; 2025. doi:10.2514/6.2025-2083'
apa: Henkenjohann, M., Nolte, U., Jahneke, J., Reimer, O., Abrams, S., Sion, F.,
Henke, C., Trächtler, A., Schubert, S., & Pfifer, H. (2025). Dynamic Wind
Tunnel Testing of an INDI-Based Flight Controller for a Tiltrotor-VTOL. AIAA
SCITECH 2025 Forum. https://doi.org/10.2514/6.2025-2083
bibtex: '@inproceedings{Henkenjohann_Nolte_Jahneke_Reimer_Abrams_Sion_Henke_Trächtler_Schubert_Pfifer_2025,
title={Dynamic Wind Tunnel Testing of an INDI-Based Flight Controller for a Tiltrotor-VTOL},
DOI={10.2514/6.2025-2083}, booktitle={AIAA
SCITECH 2025 Forum}, publisher={American Institute of Aeronautics and Astronautics},
author={Henkenjohann, Mark and Nolte, Udo and Jahneke, Julien and Reimer, Oliver
and Abrams, Stefan and Sion, Fabian and Henke, Christian and Trächtler, Ansgar
and Schubert, Sebastian and Pfifer, Harald}, year={2025} }'
chicago: Henkenjohann, Mark, Udo Nolte, Julien Jahneke, Oliver Reimer, Stefan Abrams,
Fabian Sion, Christian Henke, Ansgar Trächtler, Sebastian Schubert, and Harald
Pfifer. “Dynamic Wind Tunnel Testing of an INDI-Based Flight Controller for a
Tiltrotor-VTOL.” In AIAA SCITECH 2025 Forum. American Institute of Aeronautics
and Astronautics, 2025. https://doi.org/10.2514/6.2025-2083.
ieee: 'M. Henkenjohann et al., “Dynamic Wind Tunnel Testing of an INDI-Based
Flight Controller for a Tiltrotor-VTOL,” 2025, doi: 10.2514/6.2025-2083.'
mla: Henkenjohann, Mark, et al. “Dynamic Wind Tunnel Testing of an INDI-Based Flight
Controller for a Tiltrotor-VTOL.” AIAA SCITECH 2025 Forum, American Institute
of Aeronautics and Astronautics, 2025, doi:10.2514/6.2025-2083.
short: 'M. Henkenjohann, U. Nolte, J. Jahneke, O. Reimer, S. Abrams, F. Sion, C.
Henke, A. Trächtler, S. Schubert, H. Pfifer, in: AIAA SCITECH 2025 Forum, American
Institute of Aeronautics and Astronautics, 2025.'
date_created: 2026-01-07T15:43:24Z
date_updated: 2026-01-07T15:45:27Z
department:
- _id: '153'
- _id: '241'
doi: 10.2514/6.2025-2083
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://arc.aiaa.org/doi/10.2514/6.2025-2083
oa: '1'
publication: AIAA SCITECH 2025 Forum
publication_status: published
publisher: American Institute of Aeronautics and Astronautics
status: public
title: Dynamic Wind Tunnel Testing of an INDI-Based Flight Controller for a Tiltrotor-VTOL
type: conference
user_id: '82875'
year: '2025'
...
---
_id: '63528'
author:
- first_name: Fabian
full_name: Reiling, Fabian
last_name: Reiling
- first_name: Maximilian
full_name: Bause, Maximilian
last_name: Bause
- first_name: Stefan
full_name: Gröger, Stefan
last_name: Gröger
- first_name: Christian
full_name: Henke, Christian
last_name: Henke
- first_name: Steven
full_name: Koppert, Steven
last_name: Koppert
- first_name: Ansgar
full_name: Trächtler, Ansgar
last_name: Trächtler
citation:
ama: 'Reiling F, Bause M, Gröger S, Henke C, Koppert S, Trächtler A. Development
of a Learning-Based Control System for Robot-Assisted Grinding of Rubber Roller.
In: 2025 11th International Conference on Automation, Robotics, and Applications
(ICARA). IEEE; 2025. doi:10.1109/icara64554.2025.10977606'
apa: Reiling, F., Bause, M., Gröger, S., Henke, C., Koppert, S., & Trächtler,
A. (2025). Development of a Learning-Based Control System for Robot-Assisted Grinding
of Rubber Roller. 2025 11th International Conference on Automation, Robotics,
and Applications (ICARA). https://doi.org/10.1109/icara64554.2025.10977606
bibtex: '@inproceedings{Reiling_Bause_Gröger_Henke_Koppert_Trächtler_2025, title={Development
of a Learning-Based Control System for Robot-Assisted Grinding of Rubber Roller},
DOI={10.1109/icara64554.2025.10977606},
booktitle={2025 11th International Conference on Automation, Robotics, and Applications
(ICARA)}, publisher={IEEE}, author={Reiling, Fabian and Bause, Maximilian and
Gröger, Stefan and Henke, Christian and Koppert, Steven and Trächtler, Ansgar},
year={2025} }'
chicago: Reiling, Fabian, Maximilian Bause, Stefan Gröger, Christian Henke, Steven
Koppert, and Ansgar Trächtler. “Development of a Learning-Based Control System
for Robot-Assisted Grinding of Rubber Roller.” In 2025 11th International Conference
on Automation, Robotics, and Applications (ICARA). IEEE, 2025. https://doi.org/10.1109/icara64554.2025.10977606.
ieee: 'F. Reiling, M. Bause, S. Gröger, C. Henke, S. Koppert, and A. Trächtler,
“Development of a Learning-Based Control System for Robot-Assisted Grinding of
Rubber Roller,” 2025, doi: 10.1109/icara64554.2025.10977606.'
mla: Reiling, Fabian, et al. “Development of a Learning-Based Control System for
Robot-Assisted Grinding of Rubber Roller.” 2025 11th International Conference
on Automation, Robotics, and Applications (ICARA), IEEE, 2025, doi:10.1109/icara64554.2025.10977606.
short: 'F. Reiling, M. Bause, S. Gröger, C. Henke, S. Koppert, A. Trächtler, in:
2025 11th International Conference on Automation, Robotics, and Applications (ICARA),
IEEE, 2025.'
date_created: 2026-01-07T15:46:06Z
date_updated: 2026-01-07T15:46:51Z
department:
- _id: '153'
- _id: '241'
doi: 10.1109/icara64554.2025.10977606
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://ieeexplore.ieee.org/document/10977606
oa: '1'
publication: 2025 11th International Conference on Automation, Robotics, and Applications
(ICARA)
publication_status: published
publisher: IEEE
status: public
title: Development of a Learning-Based Control System for Robot-Assisted Grinding
of Rubber Roller
type: conference
user_id: '82875'
year: '2025'
...
---
_id: '62652'
abstract:
- lang: eng
text: Driven by the urgent need for a green, safe, and cost‐effective approach
to producing H2 and H2O2—both
highly valuable in green energy and environmental protection fields—piezocatalysis,
which converts mechanical energy into valuable chemicals, has emerged as a promising
solution. However, current catalyst systems face challenges due to the need for
materials with both a strong piezoelectric effect and favorable catalytic activity.
Herein, the construction of an oxidized carbon nitride (g‐C3N4)
matrix anchored with TiO2 nanoparticles via alkaline hydrothermal
treatment is reported. Under ultrasonication, the g‐C3N4/TiO2
composite exhibits optimal performance under carefully controlled alkaline hydrothermal
conditions. With a low concentration of Ba(OH)2 during hydrothermal
treatment, Ba(OH)2 provides an alkaline medium, oxidizing
the g‐C3N4
species and introducing structural defects into the g‐C3N4
framework. The disruption of the g‐C3N4
matrix, along with its interaction with TiO2 nanoparticles,
enhances the piezoelectric effect. Consequently, the oxidized g‐C3N4/TiO2
composite achieves a remarkable H2 production rate of 4427.2 μmol g−1
and an H2O2 production rate of 809.3 μmol g−1
within 1 h without the addition of any sacrificial agents or cocatalysts. This
work presents an effective strategy for the structural optimization of g‐C3N4‐based
materials and may inspire new approaches for designing advanced piezocatalysts.
article_number: e202500980
author:
- first_name: Ying
full_name: Pan, Ying
last_name: Pan
- first_name: Luocheng
full_name: Liao, Luocheng
last_name: Liao
- first_name: Xinwen
full_name: Zhang, Xinwen
last_name: Zhang
- first_name: Yunya
full_name: Liu, Yunya
last_name: Liu
- first_name: Ran
full_name: Su, Ran
last_name: Su
- first_name: Nieves
full_name: Lopez Salas, Nieves
id: '98120'
last_name: Lopez Salas
orcid: https://orcid.org/0000-0002-8438-9548
citation:
ama: Pan Y, Liao L, Zhang X, Liu Y, Su R, Lopez Salas N. Oxidation‐Enhanced Piezocatalytic
Activity in Carbon Nitride‐Based Catalysts for Hydrogen and Hydrogen Peroxide
Production. ChemSusChem. 2025;18(19). doi:10.1002/cssc.202500980
apa: Pan, Y., Liao, L., Zhang, X., Liu, Y., Su, R., & Lopez Salas, N. (2025).
Oxidation‐Enhanced Piezocatalytic Activity in Carbon Nitride‐Based Catalysts for
Hydrogen and Hydrogen Peroxide Production. ChemSusChem, 18(19),
Article e202500980. https://doi.org/10.1002/cssc.202500980
bibtex: '@article{Pan_Liao_Zhang_Liu_Su_Lopez Salas_2025, title={Oxidation‐Enhanced
Piezocatalytic Activity in Carbon Nitride‐Based Catalysts for Hydrogen and Hydrogen
Peroxide Production}, volume={18}, DOI={10.1002/cssc.202500980},
number={19e202500980}, journal={ChemSusChem}, publisher={Wiley}, author={Pan,
Ying and Liao, Luocheng and Zhang, Xinwen and Liu, Yunya and Su, Ran and Lopez
Salas, Nieves}, year={2025} }'
chicago: Pan, Ying, Luocheng Liao, Xinwen Zhang, Yunya Liu, Ran Su, and Nieves Lopez
Salas. “Oxidation‐Enhanced Piezocatalytic Activity in Carbon Nitride‐Based Catalysts
for Hydrogen and Hydrogen Peroxide Production.” ChemSusChem 18, no. 19
(2025). https://doi.org/10.1002/cssc.202500980.
ieee: 'Y. Pan, L. Liao, X. Zhang, Y. Liu, R. Su, and N. Lopez Salas, “Oxidation‐Enhanced
Piezocatalytic Activity in Carbon Nitride‐Based Catalysts for Hydrogen and Hydrogen
Peroxide Production,” ChemSusChem, vol. 18, no. 19, Art. no. e202500980,
2025, doi: 10.1002/cssc.202500980.'
mla: Pan, Ying, et al. “Oxidation‐Enhanced Piezocatalytic Activity in Carbon Nitride‐Based
Catalysts for Hydrogen and Hydrogen Peroxide Production.” ChemSusChem,
vol. 18, no. 19, e202500980, Wiley, 2025, doi:10.1002/cssc.202500980.
short: Y. Pan, L. Liao, X. Zhang, Y. Liu, R. Su, N. Lopez Salas, ChemSusChem 18
(2025).
date_created: 2025-11-27T13:13:31Z
date_updated: 2026-01-08T13:00:03Z
doi: 10.1002/cssc.202500980
intvolume: ' 18'
issue: '19'
language:
- iso: eng
publication: ChemSusChem
publication_identifier:
issn:
- 1864-5631
- 1864-564X
publication_status: published
publisher: Wiley
status: public
title: Oxidation‐Enhanced Piezocatalytic Activity in Carbon Nitride‐Based Catalysts
for Hydrogen and Hydrogen Peroxide Production
type: journal_article
user_id: '98120'
volume: 18
year: '2025'
...