---
_id: '63011'
author:
- first_name: Lisa
full_name: Wedekind, Lisa
id: '64381'
last_name: Wedekind
- 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: 'Wedekind L, Pollmeier P, Fechner S. Analogiebildung in kontextorientierten
Lernumgebungen. In: van Vorst H, ed. Entdecken, Lehren Und Forschen Im Schülerlabor.
Vol 45. ; 2025:145-148.'
apa: Wedekind, L., Pollmeier, P., & Fechner, S. (2025). Analogiebildung in kontextorientierten
Lernumgebungen. In H. van Vorst (Ed.), Entdecken, lehren und forschen im Schülerlabor
(Vol. 45, pp. 145–148).
bibtex: '@inproceedings{Wedekind_Pollmeier_Fechner_2025, title={Analogiebildung
in kontextorientierten Lernumgebungen}, volume={45}, booktitle={Entdecken, lehren
und forschen im Schülerlabor}, author={Wedekind, Lisa and Pollmeier, Pascal and
Fechner, Sabine}, editor={van Vorst, Helena}, year={2025}, pages={145–148} }'
chicago: Wedekind, Lisa, Pascal Pollmeier, and Sabine Fechner. “Analogiebildung
in Kontextorientierten Lernumgebungen.” In Entdecken, Lehren Und Forschen Im
Schülerlabor, edited by Helena van Vorst, 45:145–48, 2025.
ieee: L. Wedekind, P. Pollmeier, and S. Fechner, “Analogiebildung in kontextorientierten
Lernumgebungen,” in Entdecken, lehren und forschen im Schülerlabor, Bochum,
2025, vol. 45, pp. 145–148.
mla: Wedekind, Lisa, et al. “Analogiebildung in Kontextorientierten Lernumgebungen.”
Entdecken, Lehren Und Forschen Im Schülerlabor, edited by Helena van Vorst,
vol. 45, 2025, pp. 145–48.
short: 'L. Wedekind, P. Pollmeier, S. Fechner, in: H. van Vorst (Ed.), Entdecken,
Lehren Und Forschen Im Schülerlabor, 2025, pp. 145–148.'
conference:
end_date: 2024-09-12
location: Bochum
name: '51. Jahrestagung der Gesellschaft für Didaktik der Chemie und Physik e.V. '
start_date: 2024-09-09
date_created: 2025-12-10T08:12:36Z
date_updated: 2025-12-10T08:15:01Z
department:
- _id: '386'
editor:
- first_name: Helena
full_name: van Vorst, Helena
last_name: van Vorst
intvolume: ' 45'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://gdcp-ev.de/wp-content/uploads/securepdfs/2025/08/Tagungsband-2025.pdf
oa: '1'
page: 145-148
publication: Entdecken, lehren und forschen im Schülerlabor
status: public
title: Analogiebildung in kontextorientierten Lernumgebungen
type: conference
user_id: '64381'
volume: 45
year: '2025'
...
---
_id: '62269'
abstract:
- lang: eng
text: The titanium in-diffused lithium niobate waveguide platform is well-established
for reliable prototyping and packaging of many quantum photonic components at
room temperature. Nevertheless, compatibility with certain quantum light sources
and superconducting detectors requires operation under cryogenic conditions. We
characterize alterations in phase-matching and mode guiding of a non-degenerate
spontaneous parametric down-conversion process emitting around 1556 nm and 950 nm,
under cryogenic conditions. Despite the effects of pyroelectricity and photorefraction,
the spectral properties match our theoretical model. Nevertheless, these effects
cause small but significant variations within and between cooling cycles. These
measurements provide a first benchmark against which other nonlinear photonic
integration platforms, such as thin-film lithium niobate, can be compared.
article_number: '50451'
article_type: original
author:
- first_name: Nina Amelie
full_name: Lange, Nina Amelie
id: '56843'
last_name: Lange
orcid: 0000-0001-6624-7098
- first_name: Sebastian
full_name: Lengeling, Sebastian
id: '44373'
last_name: Lengeling
- first_name: Philipp
full_name: Mues, Philipp
id: '49772'
last_name: Mues
orcid: 0000-0003-0643-7636
- first_name: Viktor
full_name: Quiring, Viktor
last_name: Quiring
- first_name: Werner
full_name: Ridder, Werner
id: '63574'
last_name: Ridder
- first_name: Christof
full_name: Eigner, Christof
id: '13244'
last_name: Eigner
orcid: https://orcid.org/0000-0002-5693-3083
- first_name: Harald
full_name: Herrmann, Harald
id: '216'
last_name: Herrmann
- first_name: Christine
full_name: Silberhorn, Christine
id: '26263'
last_name: Silberhorn
- first_name: Tim
full_name: Bartley, Tim
id: '49683'
last_name: Bartley
citation:
ama: Lange NA, Lengeling S, Mues P, et al. Widely non-degenerate nonlinear frequency
conversion in cryogenic titanium in-diffused lithium niobate waveguides. Optics
Express. 2025;33(24). doi:10.1364/oe.578108
apa: Lange, N. A., Lengeling, S., Mues, P., Quiring, V., Ridder, W., Eigner, C.,
Herrmann, H., Silberhorn, C., & Bartley, T. (2025). Widely non-degenerate
nonlinear frequency conversion in cryogenic titanium in-diffused lithium niobate
waveguides. Optics Express, 33(24), Article 50451. https://doi.org/10.1364/oe.578108
bibtex: '@article{Lange_Lengeling_Mues_Quiring_Ridder_Eigner_Herrmann_Silberhorn_Bartley_2025,
title={Widely non-degenerate nonlinear frequency conversion in cryogenic titanium
in-diffused lithium niobate waveguides}, volume={33}, DOI={10.1364/oe.578108},
number={2450451}, journal={Optics Express}, publisher={Optica Publishing Group},
author={Lange, Nina Amelie and Lengeling, Sebastian and Mues, Philipp and Quiring,
Viktor and Ridder, Werner and Eigner, Christof and Herrmann, Harald and Silberhorn,
Christine and Bartley, Tim}, year={2025} }'
chicago: Lange, Nina Amelie, Sebastian Lengeling, Philipp Mues, Viktor Quiring,
Werner Ridder, Christof Eigner, Harald Herrmann, Christine Silberhorn, and Tim
Bartley. “Widely Non-Degenerate Nonlinear Frequency Conversion in Cryogenic Titanium
in-Diffused Lithium Niobate Waveguides.” Optics Express 33, no. 24 (2025).
https://doi.org/10.1364/oe.578108.
ieee: 'N. A. Lange et al., “Widely non-degenerate nonlinear frequency conversion
in cryogenic titanium in-diffused lithium niobate waveguides,” Optics Express,
vol. 33, no. 24, Art. no. 50451, 2025, doi: 10.1364/oe.578108.'
mla: Lange, Nina Amelie, et al. “Widely Non-Degenerate Nonlinear Frequency Conversion
in Cryogenic Titanium in-Diffused Lithium Niobate Waveguides.” Optics Express,
vol. 33, no. 24, 50451, Optica Publishing Group, 2025, doi:10.1364/oe.578108.
short: N.A. Lange, S. Lengeling, P. Mues, V. Quiring, W. Ridder, C. Eigner, H. Herrmann,
C. Silberhorn, T. Bartley, Optics Express 33 (2025).
date_created: 2025-11-20T10:35:35Z
date_updated: 2025-12-12T12:13:45Z
department:
- _id: '15'
- _id: '623'
- _id: '288'
doi: 10.1364/oe.578108
intvolume: ' 33'
issue: '24'
language:
- iso: eng
main_file_link:
- open_access: '1'
oa: '1'
project:
- _id: '171'
name: 'TRR 142; TP C07: Hohlraum-verstärkte Parametrische Fluoreszenz mit zeitlicher
Filterung unter Verwendung integrierter supraleitender Detektoren'
publication: Optics Express
publication_identifier:
issn:
- 1094-4087
publication_status: published
publisher: Optica Publishing Group
status: public
title: Widely non-degenerate nonlinear frequency conversion in cryogenic titanium
in-diffused lithium niobate waveguides
type: journal_article
user_id: '49683'
volume: 33
year: '2025'
...
---
_id: '63034'
author:
- first_name: Lea
full_name: Stallmeister, Lea
id: '63369'
last_name: Stallmeister
- first_name: Sebastian
full_name: Rezat, Sebastian
id: '31132'
last_name: Rezat
citation:
ama: 'Stallmeister L, Rezat S. Students’ use of different material resources for
specific purposes in the process of learning mathematics. In: Pepin B, Kohanová
I, Langfeldt MB, eds. Proceedings of the Fifth International Conference on
Mathematics Textbook Research and Development. Norwegian University of Science
and Technology; 2025.'
apa: Stallmeister, L., & Rezat, S. (2025). Students’ use of different material
resources for specific purposes in the process of learning mathematics. In B.
Pepin, I. Kohanová, & M. B. Langfeldt (Eds.), Proceedings of the Fifth
International Conference on Mathematics Textbook Research and Development.
Norwegian University of Science and Technology.
bibtex: '@inproceedings{Stallmeister_Rezat_2025, title={Students’ use of different
material resources for specific purposes in the process of learning mathematics},
booktitle={Proceedings of the Fifth International Conference on Mathematics Textbook
Research and Development}, publisher={Norwegian University of Science and Technology},
author={Stallmeister, Lea and Rezat, Sebastian}, editor={Pepin, Birgit and Kohanová,
Iveta and Langfeldt, Marit Buset}, year={2025} }'
chicago: Stallmeister, Lea, and Sebastian Rezat. “Students’ Use of Different Material
Resources for Specific Purposes in the Process of Learning Mathematics.” In Proceedings
of the Fifth International Conference on Mathematics Textbook Research and Development,
edited by Birgit Pepin, Iveta Kohanová, and Marit Buset Langfeldt. Norwegian University
of Science and Technology, 2025.
ieee: L. Stallmeister and S. Rezat, “Students’ use of different material resources
for specific purposes in the process of learning mathematics,” in Proceedings
of the Fifth International Conference on Mathematics Textbook Research and Development,
Trondheim, Norway, 2025.
mla: Stallmeister, Lea, and Sebastian Rezat. “Students’ Use of Different Material
Resources for Specific Purposes in the Process of Learning Mathematics.” Proceedings
of the Fifth International Conference on Mathematics Textbook Research and Development,
edited by Birgit Pepin et al., Norwegian University of Science and Technology,
2025.
short: 'L. Stallmeister, S. Rezat, in: B. Pepin, I. Kohanová, M.B. Langfeldt (Eds.),
Proceedings of the Fifth International Conference on Mathematics Textbook Research
and Development, Norwegian University of Science and Technology, 2025.'
conference:
end_date: 2025-06-20
location: Trondheim, Norway
name: Fifth International Conference on Mathematics Textbook Research and Development
start_date: 2025-06-17
date_created: 2025-12-11T13:15:07Z
date_updated: 2025-12-12T10:17:46Z
department:
- _id: '98'
editor:
- first_name: Birgit
full_name: Pepin, Birgit
last_name: Pepin
- first_name: Iveta
full_name: Kohanová, Iveta
last_name: Kohanová
- first_name: Marit Buset
full_name: Langfeldt, Marit Buset
last_name: Langfeldt
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://www.ntnu.edu/documents/1317903369/0/Proceedings+ICMT5+december+2026.pdf
oa: '1'
publication: Proceedings of the Fifth International Conference on Mathematics Textbook
Research and Development
publication_identifier:
isbn:
- 978-82-691902-2-9
publication_status: published
publisher: Norwegian University of Science and Technology
status: public
title: Students’ use of different material resources for specific purposes in the
process of learning mathematics
type: conference
user_id: '31132'
year: '2025'
...
---
_id: '63072'
abstract:
- lang: eng
text: Titanium alloys are widely employed for biomedical implants due to
their high strength, biocompatibility, and corrosion resistance, yet their lack
of intrinsic antibacterial activity remains a major limitation. Incorporating
copper, an antibacterial and β-stabilising element, offers a promising strategy
to enhance implant performance. This study investigates Ti-6Al-7Nb modified with
1–9 wt.% Cu via in situ alloying during metal-based laser powder bed fusion (PBF-LB/M),
with the aim of assessing processability, microstructural evolution, and mechanical
properties. Highly dense samples (>99.9%) were produced across all Cu levels,
though chemical homogeneity strongly depended on processing parameters. Increasing
Cu content promoted β-phase stabilisation, Ti2Cu precipitation, and pronounced
grain refinement. Hardness and yield strength increased nearly linearly with Cu
addition, while ductility decreased sharply at ≥5 wt.% Cu due to intermetallic
formation, hot cracking, and brittle fracture. These results illustrate both the
opportunities and constraints of rapid alloy screening via PBF-LB/M. Overall,
moderate Cu additions of 1–3 wt.% provide the most favourable balance between
mechanical performance, manufacturability, and potential antibacterial functionality.
These findings provide a clear guideline for the design of Cu-functionalised titanium
implants and demonstrate the efficiency of in situ alloy screening for accelerated
materials development.
article_number: '1053'
article_type: original
author:
- first_name: Paul
full_name: Steinmeier, Paul
last_name: Steinmeier
- first_name: Kay-Peter
full_name: Hoyer, Kay-Peter
last_name: Hoyer
- first_name: Nelson Filipe
full_name: Lopes Dias, Nelson Filipe
last_name: Lopes Dias
- first_name: Reiner
full_name: Zielke, Reiner
last_name: Zielke
- first_name: Wolfgang
full_name: Tillmann, Wolfgang
last_name: Tillmann
- first_name: Mirko
full_name: Schaper, Mirko
last_name: Schaper
citation:
ama: Steinmeier P, Hoyer K-P, Lopes Dias NF, Zielke R, Tillmann W, Schaper M. In
Situ Alloying of Ti-6Al-7Nb with Copper Using Laser Powder Bed Fusion. Crystals.
2025;15(12). doi:10.3390/cryst15121053
apa: Steinmeier, P., Hoyer, K.-P., Lopes Dias, N. F., Zielke, R., Tillmann, W.,
& Schaper, M. (2025). In Situ Alloying of Ti-6Al-7Nb with Copper Using Laser
Powder Bed Fusion. Crystals, 15(12), Article 1053. https://doi.org/10.3390/cryst15121053
bibtex: '@article{Steinmeier_Hoyer_Lopes Dias_Zielke_Tillmann_Schaper_2025, title={In
Situ Alloying of Ti-6Al-7Nb with Copper Using Laser Powder Bed Fusion}, volume={15},
DOI={10.3390/cryst15121053},
number={121053}, journal={Crystals}, publisher={MDPI AG}, author={Steinmeier,
Paul and Hoyer, Kay-Peter and Lopes Dias, Nelson Filipe and Zielke, Reiner and
Tillmann, Wolfgang and Schaper, Mirko}, year={2025} }'
chicago: Steinmeier, Paul, Kay-Peter Hoyer, Nelson Filipe Lopes Dias, Reiner Zielke,
Wolfgang Tillmann, and Mirko Schaper. “In Situ Alloying of Ti-6Al-7Nb with Copper
Using Laser Powder Bed Fusion.” Crystals 15, no. 12 (2025). https://doi.org/10.3390/cryst15121053.
ieee: 'P. Steinmeier, K.-P. Hoyer, N. F. Lopes Dias, R. Zielke, W. Tillmann, and
M. Schaper, “In Situ Alloying of Ti-6Al-7Nb with Copper Using Laser Powder Bed
Fusion,” Crystals, vol. 15, no. 12, Art. no. 1053, 2025, doi: 10.3390/cryst15121053.'
mla: Steinmeier, Paul, et al. “In Situ Alloying of Ti-6Al-7Nb with Copper Using
Laser Powder Bed Fusion.” Crystals, vol. 15, no. 12, 1053, MDPI AG, 2025,
doi:10.3390/cryst15121053.
short: P. Steinmeier, K.-P. Hoyer, N.F. Lopes Dias, R. Zielke, W. Tillmann, M. Schaper,
Crystals 15 (2025).
date_created: 2025-12-12T13:11:59Z
date_updated: 2025-12-12T14:02:13Z
ddc:
- '620'
department:
- _id: '158'
- _id: '321'
doi: 10.3390/cryst15121053
file:
- access_level: closed
content_type: application/pdf
creator: paulstei
date_created: 2025-12-12T13:12:33Z
date_updated: 2025-12-12T13:12:33Z
file_id: '63073'
file_name: crystals-15-01053.pdf
file_size: 20716652
relation: main_file
success: 1
file_date_updated: 2025-12-12T13:12:33Z
funded_apc: '1'
has_accepted_license: '1'
intvolume: ' 15'
issue: '12'
keyword:
- Biomaterial
- In Situ Alloying
- Titanium
- Additive Manufacturing
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.3390/cryst15121053
oa: '1'
publication: Crystals
publication_identifier:
issn:
- 2073-4352
publication_status: published
publisher: MDPI AG
quality_controlled: '1'
status: public
title: In Situ Alloying of Ti-6Al-7Nb with Copper Using Laser Powder Bed Fusion
type: journal_article
user_id: '69776'
volume: 15
year: '2025'
...
---
_id: '61427'
abstract:
- lang: eng
text: "The carbon footprint of modern vehicles and their mechatronic systems is
more\r\nimportant than ever. Research by the publicly funded Nalyses project and
the HELLA\r\ncompany shows that the headlamps use phase makes a significant contribution
to the life\r\ncycle footprint taking into account the current electricity mix
[1]. Today, functionalities\r\nsuch as adaptive curve light or glare-free high
beam ensure comfort and safety by\r\nassessing the state of the vehicle and evaluating
the driving scenario ahead. In future,\r\nthis evaluation will be expanded and
used to adapt the headlamp to the driving scenario\r\nin such a way that as little
light as possible is emitted, but as much light as necessary. In\r\norder to achieve
this goal, an overall evaluation of the regulatory compliant energy\r\nsaving
potential is crucial in a first step and leads to constraints for a dynamic adaption\r\nwhile
driving. In this paper, the potential is illustrated by evaluating UNECE Regulation\r\nNo.
149 and optimizing luminous intensity distributions. Depending on the different\r\nresolutions
of matrix LED headlamps, this approach can result in a significantly lower\r\nluminous
flux. On the other hand, the results are point-like distributions that raise the\r\nquestion
of whether the regulation still provides for sensible minimum requirements for\r\nmodern
matrix LED headlamps. The results are further presented in a simulated virtual\r\nenvironment
with regard to the resulting luminance in different driving scenarios. We\r\nthen
present an approach to integrate regulatory requirements into a control algorithm
by\r\nsetting optimization constraints and saturating the control. Finally, we
classify the found\r\nluminous intensity distributions qualitatively according
to common lighting criteria. In summary, although the investigated minimum distributions
are by no means desirable\r\nfor drivers themselves, they form the basis on which
energy-saving distributions for\r\nilluminated areas and twilight scenarios could
be adaptively controlled in the future."
author:
- first_name: Niklas
full_name: Fittkau, Niklas
id: '69890'
last_name: Fittkau
orcid: 0009-0007-1281-4465
- first_name: Leon
full_name: Bußemas, Leon
id: '51118'
last_name: Bußemas
- first_name: Kevin
full_name: Malena, Kevin
id: '36303'
last_name: Malena
orcid: 0000-0003-1183-4679
- first_name: Sandra
full_name: Gausemeier, Sandra
id: '17793'
last_name: Gausemeier
- first_name: Ansgar
full_name: Trächtler, Ansgar
id: '552'
last_name: Trächtler
citation:
ama: 'Fittkau N, Bußemas L, Malena K, Gausemeier S, Trächtler A. Regulatory-compliant
energy-saving potential for the passing beam of matrix LED headlamps. In: Proceedings
of the 16th International Symposium on Automotive Lighting 2025. ; 2025. doi:10.26083/tuprints-00030840'
apa: Fittkau, N., Bußemas, L., Malena, K., Gausemeier, S., & Trächtler, A. (2025).
Regulatory-compliant energy-saving potential for the passing beam of matrix LED
headlamps. Proceedings of the 16th International Symposium on Automotive Lighting
2025. 16th International Symposium on Automotive Lighting, Darmstadt. https://doi.org/10.26083/tuprints-00030840
bibtex: '@inproceedings{Fittkau_Bußemas_Malena_Gausemeier_Trächtler_2025, place={Darmstadt},
title={Regulatory-compliant energy-saving potential for the passing beam of matrix
LED headlamps}, DOI={10.26083/tuprints-00030840},
booktitle={Proceedings of the 16th International Symposium on Automotive Lighting
2025}, author={Fittkau, Niklas and Bußemas, Leon and Malena, Kevin and Gausemeier,
Sandra and Trächtler, Ansgar}, year={2025} }'
chicago: Fittkau, Niklas, Leon Bußemas, Kevin Malena, Sandra Gausemeier, and Ansgar
Trächtler. “Regulatory-Compliant Energy-Saving Potential for the Passing Beam
of Matrix LED Headlamps.” In Proceedings of the 16th International Symposium
on Automotive Lighting 2025. Darmstadt, 2025. https://doi.org/10.26083/tuprints-00030840.
ieee: 'N. Fittkau, L. Bußemas, K. Malena, S. Gausemeier, and A. Trächtler, “Regulatory-compliant
energy-saving potential for the passing beam of matrix LED headlamps,” presented
at the 16th International Symposium on Automotive Lighting, Darmstadt, 2025, doi:
10.26083/tuprints-00030840.'
mla: Fittkau, Niklas, et al. “Regulatory-Compliant Energy-Saving Potential for the
Passing Beam of Matrix LED Headlamps.” Proceedings of the 16th International
Symposium on Automotive Lighting 2025, 2025, doi:10.26083/tuprints-00030840.
short: 'N. Fittkau, L. Bußemas, K. Malena, S. Gausemeier, A. Trächtler, in: Proceedings
of the 16th International Symposium on Automotive Lighting 2025, Darmstadt, 2025.'
conference:
end_date: 2025-09-24
location: Darmstadt
name: 16th International Symposium on Automotive Lighting
start_date: 2025-09-22
date_created: 2025-09-24T08:56:38Z
date_updated: 2025-12-12T12:47:58Z
department:
- _id: '153'
doi: 10.26083/tuprints-00030840
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://tuprints.ulb.tu-darmstadt.de/30825/
oa: '1'
place: Darmstadt
project:
- _id: '693'
name: Nachhaltigkeitsoptimiertes Life Cycle Assessment technologisch hochkomplexer
Produkte am Beispiel Automobilbeleuchtung
publication: Proceedings of the 16th International Symposium on Automotive Lighting
2025
status: public
title: Regulatory-compliant energy-saving potential for the passing beam of matrix
LED headlamps
type: conference
user_id: '69890'
year: '2025'
...
---
_id: '60466'
author:
- first_name: Julian
full_name: Brockmeier, Julian
id: '44807'
last_name: Brockmeier
- first_name: Timon
full_name: Schapeler, Timon
id: '55629'
last_name: Schapeler
orcid: 0000-0001-7652-1716
- first_name: Nina Amelie
full_name: Lange, Nina Amelie
id: '56843'
last_name: Lange
orcid: 0000-0001-6624-7098
- first_name: Jan Philipp
full_name: Höpker, Jan Philipp
id: '33913'
last_name: Höpker
- first_name: Harald
full_name: Herrmann, Harald
id: '216'
last_name: Herrmann
- first_name: Christine
full_name: Silberhorn, Christine
id: '26263'
last_name: Silberhorn
- first_name: Tim
full_name: Bartley, Tim
id: '49683'
last_name: Bartley
citation:
ama: Brockmeier J, Schapeler T, Lange NA, et al. Harnessing temporal dispersion
for integrated pump filtering in spontaneous heralded single-photon generation
processes. New Journal of Physics. Published online 2025. doi:10.1088/1367-2630/ade46c
apa: Brockmeier, J., Schapeler, T., Lange, N. A., Höpker, J. P., Herrmann, H., Silberhorn,
C., & Bartley, T. (2025). Harnessing temporal dispersion for integrated pump
filtering in spontaneous heralded single-photon generation processes. New Journal
of Physics. https://doi.org/10.1088/1367-2630/ade46c
bibtex: '@article{Brockmeier_Schapeler_Lange_Höpker_Herrmann_Silberhorn_Bartley_2025,
title={Harnessing temporal dispersion for integrated pump filtering in spontaneous
heralded single-photon generation processes}, DOI={10.1088/1367-2630/ade46c},
journal={New Journal of Physics}, author={Brockmeier, Julian and Schapeler, Timon
and Lange, Nina Amelie and Höpker, Jan Philipp and Herrmann, Harald and Silberhorn,
Christine and Bartley, Tim}, year={2025} }'
chicago: Brockmeier, Julian, Timon Schapeler, Nina Amelie Lange, Jan Philipp Höpker,
Harald Herrmann, Christine Silberhorn, and Tim Bartley. “Harnessing Temporal Dispersion
for Integrated Pump Filtering in Spontaneous Heralded Single-Photon Generation
Processes.” New Journal of Physics, 2025. https://doi.org/10.1088/1367-2630/ade46c.
ieee: 'J. Brockmeier et al., “Harnessing temporal dispersion for integrated
pump filtering in spontaneous heralded single-photon generation processes,” New
Journal of Physics, 2025, doi: 10.1088/1367-2630/ade46c.'
mla: Brockmeier, Julian, et al. “Harnessing Temporal Dispersion for Integrated Pump
Filtering in Spontaneous Heralded Single-Photon Generation Processes.” New
Journal of Physics, 2025, doi:10.1088/1367-2630/ade46c.
short: J. Brockmeier, T. Schapeler, N.A. Lange, J.P. Höpker, H. Herrmann, C. Silberhorn,
T. Bartley, New Journal of Physics (2025).
date_created: 2025-06-30T08:58:37Z
date_updated: 2025-12-15T09:21:29Z
department:
- _id: '15'
- _id: '623'
doi: 10.1088/1367-2630/ade46c
language:
- iso: eng
main_file_link:
- open_access: '1'
oa: '1'
project:
- _id: '171'
name: 'TRR 142; TP C07: Hohlraum-verstärkte Parametrische Fluoreszenz mit zeitlicher
Filterung unter Verwendung integrierter supraleitender Detektoren'
publication: New Journal of Physics
status: public
title: Harnessing temporal dispersion for integrated pump filtering in spontaneous
heralded single-photon generation processes
type: journal_article
user_id: '56843'
year: '2025'
...
---
_id: '60194'
article_type: original
author:
- first_name: Hendrik
full_name: Peeters, Hendrik
id: '49942'
last_name: Peeters
orcid: https://orcid.org/ 0000-0002-7143-3781
- first_name: Jan-Luca
full_name: Hansel, Jan-Luca
id: '69242'
last_name: Hansel
- first_name: André
full_name: Graute, André
id: '13662'
last_name: Graute
- first_name: Matthias
full_name: Fischer, Matthias
id: '146'
last_name: Fischer
- first_name: Christian
full_name: Weinberger, Christian
id: '11848'
last_name: Weinberger
- first_name: Iris
full_name: Neiske, Iris
id: '53827'
last_name: Neiske
- first_name: Sabine
full_name: Fechner, Sabine
id: '54823'
last_name: Fechner
orcid: 0000-0001-5645-5870
citation:
ama: Peeters H, Hansel J-L, Graute A, et al. Virtual Reality trifft Künstliche Intelligenz.
KI unterstützt bei virtueller Praktikumsvorbereitung. Laborpraxis. 2025;(5-6):22-25.
apa: Peeters, H., Hansel, J.-L., Graute, A., Fischer, M., Weinberger, C., Neiske,
I., & Fechner, S. (2025). Virtual Reality trifft Künstliche Intelligenz. KI
unterstützt bei virtueller Praktikumsvorbereitung. Laborpraxis, 5–6,
22–25.
bibtex: '@article{Peeters_Hansel_Graute_Fischer_Weinberger_Neiske_Fechner_2025,
title={Virtual Reality trifft Künstliche Intelligenz. KI unterstützt bei virtueller
Praktikumsvorbereitung}, number={5–6}, journal={Laborpraxis}, author={Peeters,
Hendrik and Hansel, Jan-Luca and Graute, André and Fischer, Matthias and Weinberger,
Christian and Neiske, Iris and Fechner, Sabine}, year={2025}, pages={22–25} }'
chicago: 'Peeters, Hendrik, Jan-Luca Hansel, André Graute, Matthias Fischer, Christian
Weinberger, Iris Neiske, and Sabine Fechner. “Virtual Reality trifft Künstliche
Intelligenz. KI unterstützt bei virtueller Praktikumsvorbereitung.” Laborpraxis,
no. 5–6 (2025): 22–25.'
ieee: H. Peeters et al., “Virtual Reality trifft Künstliche Intelligenz.
KI unterstützt bei virtueller Praktikumsvorbereitung,” Laborpraxis, no.
5–6, pp. 22–25, 2025.
mla: Peeters, Hendrik, et al. “Virtual Reality trifft Künstliche Intelligenz. KI
unterstützt bei virtueller Praktikumsvorbereitung.” Laborpraxis, no. 5–6,
2025, pp. 22–25.
short: H. Peeters, J.-L. Hansel, A. Graute, M. Fischer, C. Weinberger, I. Neiske,
S. Fechner, Laborpraxis (2025) 22–25.
date_created: 2025-06-12T10:46:15Z
date_updated: 2025-12-14T00:02:32Z
department:
- _id: '386'
issue: 5-6
language:
- iso: ger
main_file_link:
- open_access: '1'
url: https://issuu.com/docs/26f3a2d235d0ffc8c54ff6721d3de068?fr=sMzU0NjgyNjAxMTk
oa: '1'
page: 22-25
publication: Laborpraxis
publication_status: published
status: public
title: Virtual Reality trifft Künstliche Intelligenz. KI unterstützt bei virtueller
Praktikumsvorbereitung
type: journal_article
user_id: '54823'
year: '2025'
...
---
_id: '63180'
citation:
ama: Höink D, Werbick R, Memering R, eds. Friedrich Schneider, Christus Der Meister.
Oratorium in Drei Teilen. Partitur.; 2025. doi:10.17879/41009673985
apa: Höink, D., Werbick, R., & Memering, R. (Eds.). (2025). Friedrich Schneider,
Christus der Meister. Oratorium in drei Teilen. Partitur. https://doi.org/10.17879/41009673985
bibtex: '@book{Höink_Werbick_Memering_2025, place={Münster}, title={Friedrich Schneider,
Christus der Meister. Oratorium in drei Teilen. Partitur}, DOI={10.17879/41009673985},
year={2025} }'
chicago: Höink, Dominik, Regina Werbick, and Robert Memering, eds. Friedrich
Schneider, Christus Der Meister. Oratorium in Drei Teilen. Partitur. Münster,
2025. https://doi.org/10.17879/41009673985.
ieee: D. Höink, R. Werbick, and R. Memering, Eds., Friedrich Schneider, Christus
der Meister. Oratorium in drei Teilen. Partitur. Münster, 2025.
mla: Höink, Dominik, et al., editors. Friedrich Schneider, Christus Der Meister.
Oratorium in Drei Teilen. Partitur. 2025, doi:10.17879/41009673985.
short: D. Höink, R. Werbick, R. Memering, eds., Friedrich Schneider, Christus Der
Meister. Oratorium in Drei Teilen. Partitur, Münster, 2025.
date_created: 2025-12-17T08:59:37Z
date_updated: 2025-12-17T08:59:40Z
department:
- _id: '233'
- _id: '716'
doi: 10.17879/41009673985
editor:
- first_name: Dominik
full_name: Höink, Dominik
id: '90389'
last_name: Höink
- first_name: Regina
full_name: Werbick, Regina
last_name: Werbick
- first_name: Robert
full_name: Memering, Robert
last_name: Memering
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://nbn-resolving.org/urn:nbn:de:hbz:6-41009674136
oa: '1'
place: Münster
status: public
title: Friedrich Schneider, Christus der Meister. Oratorium in drei Teilen. Partitur
type: book_editor
user_id: '90389'
year: '2025'
...
---
_id: '61239'
abstract:
- lang: ger
text: In diesem Beitrag wird ein Überblick gegeben, welche Forschung zu Digitalisierung
und künstliche Intelligenz (KI) in den Bereichen Verwaltung, Forschung, Studium
und Lehre sowie Governance von Hochschulen besteht. Der Fokus liegt hierbei auf
aktuellen Forschungsergebnissen seit der Coronapandemie. Zentral sind Fragen nach
Effektivität und Effizienz durch Digitalisierung und KI und danach, wie Verbesserungen
angestoßen werden können.
author:
- first_name: Isabel
full_name: Steinhardt, Isabel
id: '90339'
last_name: Steinhardt
orcid: https://orcid.org/0000-0002-2590-6189
citation:
ama: 'Steinhardt I. Digitalisierung und Künstliche Intelligenz. In: Pasternach P,
Reinmann G, Schneijderberg C, eds. Hochschulforschung. Nomos; 2025:197-206.
doi:10.5771/9783748943334-197'
apa: Steinhardt, I. (2025). Digitalisierung und Künstliche Intelligenz. In P. Pasternach,
G. Reinmann, & C. Schneijderberg (Eds.), Hochschulforschung (pp. 197–206).
Nomos. https://doi.org/10.5771/9783748943334-197
bibtex: '@inbook{Steinhardt_2025, place={Baden-Baden}, title={Digitalisierung und
Künstliche Intelligenz}, DOI={10.5771/9783748943334-197},
booktitle={Hochschulforschung}, publisher={Nomos}, author={Steinhardt, Isabel},
editor={Pasternach, Peer and Reinmann, Gabi and Schneijderberg, Christian}, year={2025},
pages={197–206} }'
chicago: 'Steinhardt, Isabel. “Digitalisierung und Künstliche Intelligenz.” In Hochschulforschung,
edited by Peer Pasternach, Gabi Reinmann, and Christian Schneijderberg, 197–206.
Baden-Baden: Nomos, 2025. https://doi.org/10.5771/9783748943334-197.'
ieee: 'I. Steinhardt, “Digitalisierung und Künstliche Intelligenz,” in Hochschulforschung,
P. Pasternach, G. Reinmann, and C. Schneijderberg, Eds. Baden-Baden: Nomos, 2025,
pp. 197–206.'
mla: Steinhardt, Isabel. “Digitalisierung und Künstliche Intelligenz.” Hochschulforschung,
edited by Peer Pasternach et al., Nomos, 2025, pp. 197–206, doi:10.5771/9783748943334-197.
short: 'I. Steinhardt, in: P. Pasternach, G. Reinmann, C. Schneijderberg (Eds.),
Hochschulforschung, Nomos, Baden-Baden, 2025, pp. 197–206.'
date_created: 2025-09-12T06:39:49Z
date_updated: 2025-12-17T09:05:33Z
ddc:
- '300'
department:
- _id: '121'
doi: 10.5771/9783748943334-197
editor:
- first_name: Peer
full_name: Pasternach, Peer
last_name: Pasternach
- first_name: Gabi
full_name: Reinmann, Gabi
last_name: Reinmann
- first_name: Christian
full_name: Schneijderberg, Christian
last_name: Schneijderberg
file:
- access_level: closed
content_type: application/pdf
creator: isste
date_created: 2025-09-12T06:40:59Z
date_updated: 2025-09-12T06:40:59Z
file_id: '61240'
file_name: 2025 Steinhardt Digitalisierung + KI.pdf
file_size: 280571
relation: main_file
success: 1
file_date_updated: 2025-09-12T06:40:59Z
has_accepted_license: '1'
keyword:
- Digitalisierung
- Künstliche Intelligenz
- Forschung
- Lehre
- Governance
- Verwaltung
language:
- iso: ger
main_file_link:
- open_access: '1'
url: https://www.nomos-elibrary.de/de/document/view/detail/uuid/a7061f76-3323-3cf4-aa00-0afe70aecc1c
oa: '1'
page: 197-206
place: Baden-Baden
publication: Hochschulforschung
publication_identifier:
isbn:
- '9783748943334'
publication_status: published
publisher: Nomos
quality_controlled: '1'
status: public
title: Digitalisierung und Künstliche Intelligenz
type: book_chapter
user_id: '90339'
year: '2025'
...
---
_id: '61237'
abstract:
- lang: ger
text: In diesem Beitrag wird zunächst die historische Entstehung von Open Science
kurz skizziert und definiert, was unter diesem Begriff zu verstehen ist. Daran
anschließend werden die Open-Science-Praktiken Open Data, Open Access, Open Source,
Open Methodology und Open Peer Review dargestellt und diskutiert, welche Forschungserkenntnisse
zu Open Science vorhanden sind. Im Schluss werden Forschungsdesiderate aufgegriffen
und die Implikationen von Open Science für die Wissenschaft erläutert.
author:
- first_name: Isabel
full_name: Steinhardt, Isabel
id: '90339'
last_name: Steinhardt
orcid: https://orcid.org/0000-0002-2590-6189
- first_name: Ronny
full_name: Röwert, Ronny
last_name: Röwert
citation:
ama: 'Steinhardt I, Röwert R. Open Science. In: Pasternack P, Reinmann G, Schneijderberg
C, eds. Hochschulforschung. Nomos; 2025:487-496. doi:10.5771/9783748943334-487'
apa: Steinhardt, I., & Röwert, R. (2025). Open Science. In P. Pasternack, G.
Reinmann, & C. Schneijderberg (Eds.), Hochschulforschung (pp. 487–496).
Nomos. https://doi.org/10.5771/9783748943334-487
bibtex: '@inbook{Steinhardt_Röwert_2025, place={Baden-Baden}, title={Open Science},
DOI={10.5771/9783748943334-487},
booktitle={Hochschulforschung}, publisher={Nomos}, author={Steinhardt, Isabel
and Röwert, Ronny}, editor={Pasternack, Peer and Reinmann, Gabi and Schneijderberg,
Christian }, year={2025}, pages={487–496} }'
chicago: 'Steinhardt, Isabel, and Ronny Röwert. “Open Science.” In Hochschulforschung,
edited by Peer Pasternack, Gabi Reinmann, and Christian Schneijderberg, 487–96.
Baden-Baden: Nomos, 2025. https://doi.org/10.5771/9783748943334-487.'
ieee: 'I. Steinhardt and R. Röwert, “Open Science,” in Hochschulforschung,
P. Pasternack, G. Reinmann, and C. Schneijderberg, Eds. Baden-Baden: Nomos, 2025,
pp. 487–496.'
mla: Steinhardt, Isabel, and Ronny Röwert. “Open Science.” Hochschulforschung,
edited by Peer Pasternack et al., Nomos, 2025, pp. 487–96, doi:10.5771/9783748943334-487.
short: 'I. Steinhardt, R. Röwert, in: P. Pasternack, G. Reinmann, C. Schneijderberg
(Eds.), Hochschulforschung, Nomos, Baden-Baden, 2025, pp. 487–496.'
date_created: 2025-09-12T06:35:25Z
date_updated: 2025-12-17T09:05:53Z
ddc:
- '300'
department:
- _id: '121'
doi: 10.5771/9783748943334-487
editor:
- first_name: Peer
full_name: Pasternack, Peer
last_name: Pasternack
- first_name: Gabi
full_name: Reinmann, Gabi
last_name: Reinmann
- first_name: 'Christian '
full_name: 'Schneijderberg, Christian '
last_name: Schneijderberg
file:
- access_level: closed
content_type: application/pdf
creator: isste
date_created: 2025-09-12T06:37:04Z
date_updated: 2025-09-12T06:37:04Z
file_id: '61238'
file_name: 2025 Steinhardt & Röwert Open Science.pdf
file_size: 268261
relation: main_file
success: 1
file_date_updated: 2025-09-12T06:37:04Z
has_accepted_license: '1'
keyword:
- Open Data
- Open Access
- Open Source
- Open Methodology
- Open Peer Review
language:
- iso: ger
main_file_link:
- open_access: '1'
url: https://www.nomos-elibrary.de/de/document/view/detail/uuid/cc4f88b8-f9a8-32ef-a706-a9134f224090
oa: '1'
page: 487-496
place: Baden-Baden
publication: Hochschulforschung
publication_identifier:
isbn:
- '9783748943334'
publication_status: published
publisher: Nomos
quality_controlled: '1'
status: public
title: Open Science
type: book_chapter
user_id: '90339'
year: '2025'
...
---
_id: '63185'
author:
- first_name: Rebecca
full_name: Schmidt, Rebecca
id: '94416'
last_name: Schmidt
orcid: https://orcid.org/0000-0002-2516-359X
citation:
ama: Schmidt R. KI als Herausforderungen für die qualitative Methodenlehre – ein
Diskussionsaufruf! Sozialwissenschaftliche Methodenberatung. 2025.
apa: Schmidt, R. (2025). KI als Herausforderungen für die qualitative Methodenlehre
– ein Diskussionsaufruf! Sozialwissenschaftliche Methodenberatung.
bibtex: '@article{Schmidt_2025, title={KI als Herausforderungen für die qualitative
Methodenlehre – ein Diskussionsaufruf!}, journal={ Sozialwissenschaftliche Methodenberatung},
author={Schmidt, Rebecca}, year={2025} }'
chicago: Schmidt, Rebecca. “KI als Herausforderungen für die qualitative Methodenlehre
– ein Diskussionsaufruf!” Sozialwissenschaftliche Methodenberatung, 2025.
ieee: R. Schmidt, “KI als Herausforderungen für die qualitative Methodenlehre –
ein Diskussionsaufruf!,” Sozialwissenschaftliche Methodenberatung, 2025.
mla: Schmidt, Rebecca. “KI als Herausforderungen für die qualitative Methodenlehre
– ein Diskussionsaufruf!” Sozialwissenschaftliche Methodenberatung, 2025.
short: R. Schmidt, Sozialwissenschaftliche Methodenberatung (2025).
date_created: 2025-12-17T13:47:03Z
date_updated: 2025-12-17T13:50:21Z
department:
- _id: '121'
- _id: '477'
language:
- iso: ger
main_file_link:
- open_access: '1'
url: https://sozmethode.hypotheses.org/3210
oa: '1'
publication: ' Sozialwissenschaftliche Methodenberatung'
publication_date: 2025-12-17
status: public
title: KI als Herausforderungen für die qualitative Methodenlehre – ein Diskussionsaufruf!
type: newspaper_article
user_id: '94416'
year: '2025'
...
---
_id: '63192'
abstract:
- lang: eng
text: Lithium niobate (LiNbO3) is a widely used material with several desirable
physical properties, such as high second-order nonlinear optical and strong electro-optical
effects. Thus LiNbO3 is used for various applications such as electro-optic modulation
or nonlinear frequency conversion and mixing. But LiNbO3 also exhibits a strong
photorefractive effect, which limits the intensity of the optical fields involved.
Various approaches to reduce the photorefractive effect have been investigated,
such as increasing the temperature, doping the crystal or using different waveguide
designs in LiNbO3. Here, we present an analysis of the approach to increase the
photorefractive damage threshold by using different waveguide designs. Contrary
to previous claims and investigations, our SHG measurements revealed no significant
difference in resistance to photorefractive damage when comparing conventional
Ti-doped channel waveguides and Ti-doped diced ridge waveguides in LiNbO3. Furthermore,
we have investigated the effect of photorefractive cleaning and curing using a
light field at 532 nm. Here, we observe a reduction in the photorefractive effect
at room temperature during and after SHG measurements, which is an easy alternative
to conventional approaches.
article_number: '114260'
article_type: original
author:
- first_name: Michelle
full_name: Kirsch, Michelle
id: '69553'
last_name: Kirsch
- first_name: Christian
full_name: Kießler, Christian
id: '44252'
last_name: Kießler
- first_name: Sebastian
full_name: Lengeling, Sebastian
id: '44373'
last_name: Lengeling
- first_name: Michael
full_name: Stefszky, Michael
id: '42777'
last_name: Stefszky
- first_name: Christof
full_name: Eigner, Christof
id: '13244'
last_name: Eigner
orcid: https://orcid.org/0000-0002-5693-3083
- first_name: Harald
full_name: Herrmann, Harald
id: '216'
last_name: Herrmann
- first_name: Christine
full_name: Silberhorn, Christine
id: '26263'
last_name: Silberhorn
citation:
ama: Kirsch M, Kießler C, Lengeling S, et al. Photorefraction and in-situ optical
cleaning in various types of LiNbO3 waveguides. Optics & Laser Technology.
2025;193. doi:10.1016/j.optlastec.2025.114260
apa: Kirsch, M., Kießler, C., Lengeling, S., Stefszky, M., Eigner, C., Herrmann,
H., & Silberhorn, C. (2025). Photorefraction and in-situ optical cleaning
in various types of LiNbO3 waveguides. Optics & Laser Technology, 193,
Article 114260. https://doi.org/10.1016/j.optlastec.2025.114260
bibtex: '@article{Kirsch_Kießler_Lengeling_Stefszky_Eigner_Herrmann_Silberhorn_2025,
title={Photorefraction and in-situ optical cleaning in various types of LiNbO3
waveguides}, volume={193}, DOI={10.1016/j.optlastec.2025.114260},
number={114260}, journal={Optics & Laser Technology}, publisher={Elsevier
BV}, author={Kirsch, Michelle and Kießler, Christian and Lengeling, Sebastian
and Stefszky, Michael and Eigner, Christof and Herrmann, Harald and Silberhorn,
Christine}, year={2025} }'
chicago: Kirsch, Michelle, Christian Kießler, Sebastian Lengeling, Michael Stefszky,
Christof Eigner, Harald Herrmann, and Christine Silberhorn. “Photorefraction and
In-Situ Optical Cleaning in Various Types of LiNbO3 Waveguides.” Optics &
Laser Technology 193 (2025). https://doi.org/10.1016/j.optlastec.2025.114260.
ieee: 'M. Kirsch et al., “Photorefraction and in-situ optical cleaning in
various types of LiNbO3 waveguides,” Optics & Laser Technology, vol.
193, Art. no. 114260, 2025, doi: 10.1016/j.optlastec.2025.114260.'
mla: Kirsch, Michelle, et al. “Photorefraction and In-Situ Optical Cleaning in Various
Types of LiNbO3 Waveguides.” Optics & Laser Technology, vol. 193, 114260,
Elsevier BV, 2025, doi:10.1016/j.optlastec.2025.114260.
short: M. Kirsch, C. Kießler, S. Lengeling, M. Stefszky, C. Eigner, H. Herrmann,
C. Silberhorn, Optics & Laser Technology 193 (2025).
date_created: 2025-12-18T08:17:57Z
date_updated: 2025-12-18T08:27:13Z
department:
- _id: '288'
- _id: '623'
- _id: '15'
doi: 10.1016/j.optlastec.2025.114260
intvolume: ' 193'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://www.sciencedirect.com/science/article/pii/S0030399225018511?via%3Dihub
oa: '1'
publication: Optics & Laser Technology
publication_identifier:
issn:
- 0030-3992
publication_status: published
publisher: Elsevier BV
quality_controlled: '1'
status: public
title: Photorefraction and in-situ optical cleaning in various types of LiNbO3 waveguides
type: journal_article
user_id: '69553'
volume: 193
year: '2025'
...
---
_id: '62766'
abstract:
- lang: eng
text: raditional assessment formats in university-based EFL teacher education programs
usually focus on cognitive dispositions rather than on the actual performance
of pre-service EFL teachers in everyday teaching situations. This assessment gap
is addressed in this thesis by developing and validating a role-play-based simulation
(RobS) designed for the summative assessment of pre-service EFL teachers' feedback
competence on writing. Drawing on theories from multiple disciplines, such as
higher education, medical education, teacher education, educational psychology,
and EFL-specific didactics, the RobS is developed as a performance-oriented assessment
format. In the RobS, pre-service EFL teachers engage in a feedback conversation
with trained actors who portray a standardized learner. Following an argument-based
approach to validation, the extent to which the RobS can be considered valid is
investigated. Data from multiple studies, focusing on aspects such as authenticity,
fairness, reliability, and external validity, are presented. The discussion in
the validity argument indicates that the RobS can elicit and assess the performative
facet of feedback competence on writing with sufficient confidence. This work
contributes a novel, empirically supported assessment framework to teacher education
research. Moreover, it presents an approach to address the assessment gap, enabling
pre-service EFL teachers to show how they provide feedback, rather than just tell
their lecturers about it.
author:
- first_name: Thomas
full_name: Janzen, Thomas
id: '89329'
last_name: Janzen
orcid: 0009-0003-1941-166X
citation:
ama: Janzen T. Show, Don’t Tell - Developing and Validating a Role-Play-Based
Simulation (RobS) for the Assessment of Pre-Service EFL Teachers’ Feedback Competence
on Writing. Logos Verlag; 2025. doi:https://doi.org/10.30819/5994
apa: Janzen, T. (2025). Show, don’t tell - Developing and Validating a Role-Play-Based
Simulation (RobS) for the Assessment of Pre-Service EFL Teachers’ Feedback Competence
on Writing. Logos Verlag. https://doi.org/10.30819/5994
bibtex: '@book{Janzen_2025, place={Berlin}, title={Show, don’t tell - Developing
and Validating a Role-Play-Based Simulation (RobS) for the Assessment of Pre-Service
EFL Teachers’ Feedback Competence on Writing}, DOI={https://doi.org/10.30819/5994},
publisher={Logos Verlag}, author={Janzen, Thomas}, year={2025} }'
chicago: 'Janzen, Thomas. Show, Don’t Tell - Developing and Validating a Role-Play-Based
Simulation (RobS) for the Assessment of Pre-Service EFL Teachers’ Feedback Competence
on Writing. Berlin: Logos Verlag, 2025. https://doi.org/10.30819/5994.'
ieee: 'T. Janzen, Show, don’t tell - Developing and Validating a Role-Play-Based
Simulation (RobS) for the Assessment of Pre-Service EFL Teachers’ Feedback Competence
on Writing. Berlin: Logos Verlag, 2025.'
mla: Janzen, Thomas. Show, Don’t Tell - Developing and Validating a Role-Play-Based
Simulation (RobS) for the Assessment of Pre-Service EFL Teachers’ Feedback Competence
on Writing. Logos Verlag, 2025, doi:https://doi.org/10.30819/5994.
short: T. Janzen, Show, Don’t Tell - Developing and Validating a Role-Play-Based
Simulation (RobS) for the Assessment of Pre-Service EFL Teachers’ Feedback Competence
on Writing, Logos Verlag, Berlin, 2025.
date_created: 2025-12-03T11:11:44Z
date_updated: 2025-12-23T07:33:22Z
ddc:
- '370'
doi: https://doi.org/10.30819/5994
extern: '1'
file:
- access_level: open_access
content_type: application/pdf
creator: janzent
date_created: 2025-12-23T07:31:25Z
date_updated: 2025-12-23T07:31:25Z
file_id: '63404'
file_name: Janzen, T. (2025).pdf
file_size: 9551046
relation: main_file
file_date_updated: 2025-12-23T07:31:25Z
has_accepted_license: '1'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.30819/5994
oa: '1'
place: Berlin
publication_identifier:
unknown:
- ' 978-3-8325-5994-6'
publication_status: published
publisher: Logos Verlag
status: public
supervisor:
- first_name: Christoph
full_name: Vogelsang, Christoph
id: '4245'
last_name: Vogelsang
orcid: 0000-0002-5804-1855
title: Show, don’t tell - Developing and Validating a Role-Play-Based Simulation (RobS)
for the Assessment of Pre-Service EFL Teachers’ Feedback Competence on Writing
type: dissertation
user_id: '89329'
year: '2025'
...
---
_id: '63397'
abstract:
- lang: eng
text: Decarbonizing industrial process heat is a crucial step in mitigating climate
change. While Process Mining (PM) has gained traction in sustainability research—such
as optimizing production scheduling to reduce energy use or accounting for carbon
footprints—it has largely overlooked the challenges and opportunities related
to thermal energy, accounting for 66% of total energy demand in industrial processes.
At the same time, Heat Integration (HI) is an established engineering discipline
focused on maximizing the efficiency of thermal energy systems. However, HI traditionally
relies on static or incomplete data about energy demands, limiting its effectiveness
and accuracy. In this paper, we propose a novel framework that combines PM and
HI to enable data-driven, process- and product-centric modeling of industrial
energy demands. By integrating event logs and thermal energy data, our approach
allows for a fine-grained analysis of heat demand patterns corresponding to specific
process activities and product variants. We demonstrate the applicability and
advantages of the framework by simulating a pharmaceutical manufacturing process
and evaluating energy demands and heat recovery potentials. Our findings show
that our PM-enabled HI framework provides more accurate and actionable insights
into the temporal and product-specific variation of thermal energy demands. By
capturing the causal relationships between process activities, product characteristics,
and energy consumption, our approach enables improved analysis, planning, and
optimization for heat recovery and process decarbonization. This integration of
PM and HI expands the analytical tools for both disciplines and contributes to
advancing the sustainable transformation of industrial processes.
author:
- first_name: David Ricardo
full_name: Zapata Gonzalez, David Ricardo
id: '105506'
last_name: Zapata Gonzalez
- first_name: Katharina
full_name: Brennig, Katharina
id: '51905'
last_name: Brennig
- first_name: Kay
full_name: Benkert, Kay
last_name: Benkert
- first_name: Florian
full_name: Schlosser, Florian
id: '88614'
last_name: Schlosser
- first_name: Oliver
full_name: Müller, Oliver
id: '72849'
last_name: Müller
citation:
ama: 'Zapata Gonzalez DR, Brennig K, Benkert K, Schlosser F, Müller O. Process Mining
for Robust Heat Integration through Process- and Product-Centric Energy Demand
Modeling. In: ACM SIGEnergy Energy Informatics Review. Vol 5. Association
for Computing Machinery (ACM); 2025:19-31. doi:10.1145/3777518.3777520'
apa: Zapata Gonzalez, D. R., Brennig, K., Benkert, K., Schlosser, F., & Müller,
O. (2025). Process Mining for Robust Heat Integration through Process- and Product-Centric
Energy Demand Modeling. ACM SIGEnergy Energy Informatics Review, 5(3),
19–31. https://doi.org/10.1145/3777518.3777520
bibtex: '@inproceedings{Zapata Gonzalez_Brennig_Benkert_Schlosser_Müller_2025, title={Process
Mining for Robust Heat Integration through Process- and Product-Centric Energy
Demand Modeling}, volume={5}, DOI={10.1145/3777518.3777520},
number={3}, booktitle={ACM SIGEnergy Energy Informatics Review}, publisher={Association
for Computing Machinery (ACM)}, author={Zapata Gonzalez, David Ricardo and Brennig,
Katharina and Benkert, Kay and Schlosser, Florian and Müller, Oliver}, year={2025},
pages={19–31} }'
chicago: Zapata Gonzalez, David Ricardo, Katharina Brennig, Kay Benkert, Florian
Schlosser, and Oliver Müller. “Process Mining for Robust Heat Integration through
Process- and Product-Centric Energy Demand Modeling.” In ACM SIGEnergy Energy
Informatics Review, 5:19–31. Association for Computing Machinery (ACM), 2025.
https://doi.org/10.1145/3777518.3777520.
ieee: 'D. R. Zapata Gonzalez, K. Brennig, K. Benkert, F. Schlosser, and O. Müller,
“Process Mining for Robust Heat Integration through Process- and Product-Centric
Energy Demand Modeling,” in ACM SIGEnergy Energy Informatics Review, 2025,
vol. 5, no. 3, pp. 19–31, doi: 10.1145/3777518.3777520.'
mla: Zapata Gonzalez, David Ricardo, et al. “Process Mining for Robust Heat Integration
through Process- and Product-Centric Energy Demand Modeling.” ACM SIGEnergy
Energy Informatics Review, vol. 5, no. 3, Association for Computing Machinery
(ACM), 2025, pp. 19–31, doi:10.1145/3777518.3777520.
short: 'D.R. Zapata Gonzalez, K. Brennig, K. Benkert, F. Schlosser, O. Müller, in:
ACM SIGEnergy Energy Informatics Review, Association for Computing Machinery (ACM),
2025, pp. 19–31.'
date_created: 2025-12-22T13:13:37Z
date_updated: 2025-12-22T13:15:08Z
doi: 10.1145/3777518.3777520
intvolume: ' 5'
issue: '3'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://dl.acm.org/doi/abs/10.1145/3777518.3777520
oa: '1'
page: 19-31
publication: ACM SIGEnergy Energy Informatics Review
publication_identifier:
issn:
- 2770-5331
- 2770-5331
publication_status: published
publisher: Association for Computing Machinery (ACM)
status: public
title: Process Mining for Robust Heat Integration through Process- and Product-Centric
Energy Demand Modeling
type: conference
user_id: '105506'
volume: 5
year: '2025'
...
---
_id: '63400'
abstract:
- lang: eng
text: Data centers (DCs) form the backbone of our growing digital economy, but their
rising energy demands pose challenges to our environment. At the same time, reusing
waste heat from DCs also represents an opportunity, for example, for more sustainable
heating of residential buildings. Modeling and optimizing these coupled and dynamic
systems of heat generation and reuse is complex. On the one hand, physical simulations
can be used to model these systems, but they are time-consuming to develop and
run. Machine learning (ML), on the other hand, allows efficient data-driven modeling,
but conventional correlation-based approaches struggle with the prediction of
interventions and out-of-distribution generalization. Recent advances in causal
ML, which combine principles from causal inference with flexible ML methods, are
a promising approach for more robust predictions. Due to their focus on modeling
interventions and cause-and-effect relationships, it is difficult to evaluate
causal ML approaches rigorously. To address this challenge, we built a testbed
of a miniature DC with an integrated waste heat network, equipped with sensors
and actuators. This testbed allows conducting controlled experiments and automatic
collection of realistic data, which can then be used to benchmark conventional
and causal ML methods. Our experimental results highlight the strengths and weaknesses
of each modeling approach, providing valuable insights on how to appropriately
apply different types of machine learning to optimize data center operations and
enhance their sustainability.
author:
- first_name: David Ricardo
full_name: Zapata Gonzalez, David Ricardo
id: '105506'
last_name: Zapata Gonzalez
- first_name: Marcel
full_name: Meyer, Marcel
id: '105120'
last_name: Meyer
- first_name: Oliver
full_name: Müller, Oliver
id: '72849'
last_name: Müller
citation:
ama: 'Zapata Gonzalez DR, Meyer M, Müller O. Causal Machine Learning Approaches
for Modelling Data Center Heat Recovery: A Physical Testbed Study. In: ACM
SIGEnergy Energy Informatics Review. Vol 5. Association for Computing Machinery
(ACM); 2025:4-10. doi:10.1145/3757892.3757893'
apa: 'Zapata Gonzalez, D. R., Meyer, M., & Müller, O. (2025). Causal Machine
Learning Approaches for Modelling Data Center Heat Recovery: A Physical Testbed
Study. ACM SIGEnergy Energy Informatics Review, 5(2), 4–10. https://doi.org/10.1145/3757892.3757893'
bibtex: '@inproceedings{Zapata Gonzalez_Meyer_Müller_2025, title={Causal Machine
Learning Approaches for Modelling Data Center Heat Recovery: A Physical Testbed
Study}, volume={5}, DOI={10.1145/3757892.3757893},
number={2}, booktitle={ACM SIGEnergy Energy Informatics Review}, publisher={Association
for Computing Machinery (ACM)}, author={Zapata Gonzalez, David Ricardo and Meyer,
Marcel and Müller, Oliver}, year={2025}, pages={4–10} }'
chicago: 'Zapata Gonzalez, David Ricardo, Marcel Meyer, and Oliver Müller. “Causal
Machine Learning Approaches for Modelling Data Center Heat Recovery: A Physical
Testbed Study.” In ACM SIGEnergy Energy Informatics Review, 5:4–10. Association
for Computing Machinery (ACM), 2025. https://doi.org/10.1145/3757892.3757893.'
ieee: 'D. R. Zapata Gonzalez, M. Meyer, and O. Müller, “Causal Machine Learning
Approaches for Modelling Data Center Heat Recovery: A Physical Testbed Study,”
in ACM SIGEnergy Energy Informatics Review, 2025, vol. 5, no. 2, pp. 4–10,
doi: 10.1145/3757892.3757893.'
mla: 'Zapata Gonzalez, David Ricardo, et al. “Causal Machine Learning Approaches
for Modelling Data Center Heat Recovery: A Physical Testbed Study.” ACM SIGEnergy
Energy Informatics Review, vol. 5, no. 2, Association for Computing Machinery
(ACM), 2025, pp. 4–10, doi:10.1145/3757892.3757893.'
short: 'D.R. Zapata Gonzalez, M. Meyer, O. Müller, in: ACM SIGEnergy Energy Informatics
Review, Association for Computing Machinery (ACM), 2025, pp. 4–10.'
date_created: 2025-12-22T13:19:06Z
date_updated: 2025-12-22T13:20:02Z
doi: 10.1145/3757892.3757893
intvolume: ' 5'
issue: '2'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://dl.acm.org/doi/abs/10.1145/3757892.3757893
oa: '1'
page: 4-10
publication: ACM SIGEnergy Energy Informatics Review
publication_identifier:
issn:
- 2770-5331
- 2770-5331
publication_status: published
publisher: Association for Computing Machinery (ACM)
status: public
title: 'Causal Machine Learning Approaches for Modelling Data Center Heat Recovery:
A Physical Testbed Study'
type: conference
user_id: '105506'
volume: 5
year: '2025'
...
---
_id: '63399'
abstract:
- lang: eng
text: Data centers (DCs) form the backbone of our growing digital economy, but their
rising energy demands pose challenges to our environment. At the same time, reusing
waste heat from DCs also represents an opportunity, for example, for more sustainable
heating of residential buildings. Modeling and optimizing these coupled and dynamic
systems of heat generation and reuse is complex. On the one hand, physical simulations
can be used to model these systems, but they are time-consuming to develop and
run. Machine learning (ML), on the other hand, allows efficient data-driven modeling,
but conventional correlation-based approaches struggle with the prediction of
interventions and out-of-distribution generalization. Recent advances in causal
ML, which combine principles from causal inference with flexible ML methods, are
a promising approach for more robust predictions. Due to their focus on modeling
interventions and cause-and-effect relationships, it is difficult to evaluate
causal ML approaches rigorously. To address this challenge, we built a testbed
of a miniature DC with an integrated waste heat network, equipped with sensors
and actuators. This testbed allows conducting controlled experiments and automatic
collection of realistic data, which can then be used to benchmark conventional
and causal ML methods. Our experimental results highlight the strengths and weaknesses
of each modeling approach, providing valuable insights on how to appropriately
apply different types of machine learning to optimize data center operations and
enhance their sustainability.
author:
- first_name: David Zapata
full_name: Gonzalez, David Zapata
last_name: Gonzalez
- first_name: Marcel
full_name: Meyer, Marcel
last_name: Meyer
- first_name: Oliver
full_name: Müller, Oliver
last_name: Müller
citation:
ama: 'Gonzalez DZ, Meyer M, Müller O. Causal Machine Learning Approaches for Modelling
Data Center Heat Recovery: A Physical Testbed Study. In: ACM SIGEnergy Energy
Informatics Review. Vol 5. Association for Computing Machinery (ACM); 2025:4-10.
doi:10.1145/3757892.3757893'
apa: 'Gonzalez, D. Z., Meyer, M., & Müller, O. (2025). Causal Machine Learning
Approaches for Modelling Data Center Heat Recovery: A Physical Testbed Study.
ACM SIGEnergy Energy Informatics Review, 5(2), 4–10. https://doi.org/10.1145/3757892.3757893'
bibtex: '@inproceedings{Gonzalez_Meyer_Müller_2025, title={Causal Machine Learning
Approaches for Modelling Data Center Heat Recovery: A Physical Testbed Study},
volume={5}, DOI={10.1145/3757892.3757893},
number={2}, booktitle={ACM SIGEnergy Energy Informatics Review}, publisher={Association
for Computing Machinery (ACM)}, author={Gonzalez, David Zapata and Meyer, Marcel
and Müller, Oliver}, year={2025}, pages={4–10} }'
chicago: 'Gonzalez, David Zapata, Marcel Meyer, and Oliver Müller. “Causal Machine
Learning Approaches for Modelling Data Center Heat Recovery: A Physical Testbed
Study.” In ACM SIGEnergy Energy Informatics Review, 5:4–10. Association
for Computing Machinery (ACM), 2025. https://doi.org/10.1145/3757892.3757893.'
ieee: 'D. Z. Gonzalez, M. Meyer, and O. Müller, “Causal Machine Learning Approaches
for Modelling Data Center Heat Recovery: A Physical Testbed Study,” in ACM
SIGEnergy Energy Informatics Review, 2025, vol. 5, no. 2, pp. 4–10, doi: 10.1145/3757892.3757893.'
mla: 'Gonzalez, David Zapata, et al. “Causal Machine Learning Approaches for Modelling
Data Center Heat Recovery: A Physical Testbed Study.” ACM SIGEnergy Energy
Informatics Review, vol. 5, no. 2, Association for Computing Machinery (ACM),
2025, pp. 4–10, doi:10.1145/3757892.3757893.'
short: 'D.Z. Gonzalez, M. Meyer, O. Müller, in: ACM SIGEnergy Energy Informatics
Review, Association for Computing Machinery (ACM), 2025, pp. 4–10.'
date_created: 2025-12-22T13:17:36Z
date_updated: 2025-12-22T13:18:19Z
doi: 10.1145/3757892.3757893
intvolume: ' 5'
issue: '2'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://dl.acm.org/doi/abs/10.1145/3757892.3757893
oa: '1'
page: 4-10
publication: ACM SIGEnergy Energy Informatics Review
publication_identifier:
issn:
- 2770-5331
- 2770-5331
publication_status: published
publisher: Association for Computing Machinery (ACM)
status: public
title: 'Causal Machine Learning Approaches for Modelling Data Center Heat Recovery:
A Physical Testbed Study'
type: conference
user_id: '105506'
volume: 5
year: '2025'
...
---
_id: '63403'
abstract:
- lang: eng
text: "Stateful signatures like the NIST standardized signature schemes LMS and
XMSS provide an efficient and mature realization of post-quantum secure signature
schemes. They are recommended for long-term use cases like e.g. firmware signing.
However, stateful signature schemes require to properly manage a so-called state.
In stateful signature schemes like LMS and XMSS, signing keys consist of a set
of keys of a one-time signature scheme and it has to be guaranteed that each one-time
key is used only once. This is done by updating a state in each signature computation,
basically recording which one-time keys have already been used. While this is
straightforward in centralized systems, in distributed systems like secure enclaves
consisting of e.g. multiple hardware security modules (HSMs) with limited communication
keeping a distributed state that at any point in time is consistent among all
parties involved presents a challenge. This challenge is not addressed by the
current standardization processes. \r\nIn this paper we present a security model
for the distributed key management of post-quantum secure stateful signatures
like XMSS and LMS. We also present a simple, efficient, and easy to implement
protocol proven secure in this security model, i.e. the protocol guarantees at
any point in time a consistent state among the parties in a distributed system,
like a distributed security enclave. The security model is defined in the universal
composabilty (UC) framework by Ran Canetti by providing an ideal functionality
for the distributed key management for stateful signatures. Hence our protocol
remains secure even if arbitrarily composed with other instances of the same or
other protocols, a necessity for the security of distributed key management protocols.
Our main application are security enclaves consisting of HSMs, but the model and
the protocol can easily be adapted to other scenarios of distributed key management
of stateful signature schemes."
author:
- first_name: Johannes
full_name: Blömer, Johannes
id: '23'
last_name: Blömer
- first_name: Henrik
full_name: Bröcher, Henrik
id: '41047'
last_name: Bröcher
orcid: 0009-0008-3938-5485
- first_name: Volker
full_name: Krummel, Volker
last_name: Krummel
- first_name: Laurens Alexander
full_name: Porzenheim, Laurens Alexander
id: '47434'
last_name: Porzenheim
citation:
ama: Blömer J, Bröcher H, Krummel V, Porzenheim LA. Secure Distributed State Management
for Stateful Signatures with a Practical and Universally Composable Protocol.
apa: Blömer, J., Bröcher, H., Krummel, V., & Porzenheim, L. A. (n.d.). Secure
Distributed State Management for Stateful Signatures with a Practical and Universally
Composable Protocol.
bibtex: '@article{Blömer_Bröcher_Krummel_Porzenheim, title={Secure Distributed State
Management for Stateful Signatures with a Practical and Universally Composable
Protocol}, author={Blömer, Johannes and Bröcher, Henrik and Krummel, Volker and
Porzenheim, Laurens Alexander} }'
chicago: Blömer, Johannes, Henrik Bröcher, Volker Krummel, and Laurens Alexander
Porzenheim. “Secure Distributed State Management for Stateful Signatures with
a Practical and Universally Composable Protocol,” n.d.
ieee: J. Blömer, H. Bröcher, V. Krummel, and L. A. Porzenheim, “Secure Distributed
State Management for Stateful Signatures with a Practical and Universally Composable
Protocol.” .
mla: Blömer, Johannes, et al. Secure Distributed State Management for Stateful
Signatures with a Practical and Universally Composable Protocol.
short: J. Blömer, H. Bröcher, V. Krummel, L.A. Porzenheim, (n.d.).
date_created: 2025-12-22T21:23:22Z
date_updated: 2025-12-23T11:30:38Z
department:
- _id: '34'
- _id: '64'
keyword:
- distributed state
- hash-based signature
- stateful hash-based signature
- universal composability
- secure enclave
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://eprint.iacr.org/2025/2278.pdf
oa: '1'
page: '22'
project:
- _id: '191'
name: 'PhoQuant: Photonische Quantencomputer - Quantencomputing Testplattform'
publication_status: submitted
status: public
title: Secure Distributed State Management for Stateful Signatures with a Practical
and Universally Composable Protocol
type: preprint
user_id: '41047'
year: '2025'
...
---
_id: '59091'
abstract:
- lang: eng
text: Abstract. Liquid Metal Embrittlement (LME) cracking is a well-documented
issue encountered during resistance spot welding (RSW) of zinc-coated advanced
high-strength steels (AHSS) in automotive manufacturing. Given that existing research
has predominantly focused on laboratory-scale samples and lacks investigation
into the load-bearing capacity of joints under crash conditions, this study aims
to fill these gaps by analyzing third-generation zinc-coated AHSS. S-Rail components
were produced through stamping to replicate real-world manufacturing conditions
and geometries of automotive parts. To account for the disturbances typically
encountered in production, samples with LME cracks were intentionally fabricated.
Subsequently, a modified three-point bending test, assisted by numerical simulations,
was developed to effectively apply loads to the weld spots of the S-Rail components.
Results from crash tests demonstrated that observed light crack severity does
not significantly compromise the joint's load-bearing capacity or lead to earlier
joint failure.
author:
- first_name: Keke
full_name: Yang, Keke
id: '65085'
last_name: Yang
orcid: 0000-0001-9201-9304
- first_name: Max
full_name: Biegler, Max
last_name: Biegler
- first_name: Linus
full_name: Happe, Linus
last_name: Happe
- first_name: Marius
full_name: Striewe, Marius
id: '30228'
last_name: Striewe
- first_name: Viktoria
full_name: Olfert, Viktoria
id: '5974'
last_name: Olfert
- first_name: David
full_name: Hein, David
id: '7728'
last_name: Hein
- first_name: 'Michael '
full_name: 'Rethmeier, Michael '
last_name: Rethmeier
- first_name: Gerson
full_name: Meschut, Gerson
id: '32056'
last_name: Meschut
orcid: 0000-0002-2763-1246
citation:
ama: 'Yang K, Biegler M, Happe L, et al. Influence of Liquid metal embrittlement
on load-bearing capacity of resistance spot welds under crash loads: A study based
on S-Rail components. In: Materials Research Proceedings. Vol 52. Materials
Research Forum LLC; 2025. doi:10.21741/9781644903551-42'
apa: 'Yang, K., Biegler, M., Happe, L., Striewe, M., Olfert, V., Hein, D., Rethmeier,
M., & Meschut, G. (2025). Influence of Liquid metal embrittlement on load-bearing
capacity of resistance spot welds under crash loads: A study based on S-Rail components.
Materials Research Proceedings, 52. https://doi.org/10.21741/9781644903551-42'
bibtex: '@inproceedings{Yang_Biegler_Happe_Striewe_Olfert_Hein_Rethmeier_Meschut_2025,
title={Influence of Liquid metal embrittlement on load-bearing capacity of resistance
spot welds under crash loads: A study based on S-Rail components}, volume={52},
DOI={10.21741/9781644903551-42},
booktitle={Materials Research Proceedings}, publisher={Materials Research Forum
LLC}, author={Yang, Keke and Biegler, Max and Happe, Linus and Striewe, Marius
and Olfert, Viktoria and Hein, David and Rethmeier, Michael and Meschut, Gerson},
year={2025} }'
chicago: 'Yang, Keke, Max Biegler, Linus Happe, Marius Striewe, Viktoria Olfert,
David Hein, Michael Rethmeier, and Gerson Meschut. “Influence of Liquid Metal
Embrittlement on Load-Bearing Capacity of Resistance Spot Welds under Crash Loads:
A Study Based on S-Rail Components.” In Materials Research Proceedings,
Vol. 52. Materials Research Forum LLC, 2025. https://doi.org/10.21741/9781644903551-42.'
ieee: 'K. Yang et al., “Influence of Liquid metal embrittlement on load-bearing
capacity of resistance spot welds under crash loads: A study based on S-Rail components,”
in Materials Research Proceedings, 2025, vol. 52, doi: 10.21741/9781644903551-42.'
mla: 'Yang, Keke, et al. “Influence of Liquid Metal Embrittlement on Load-Bearing
Capacity of Resistance Spot Welds under Crash Loads: A Study Based on S-Rail Components.”
Materials Research Proceedings, vol. 52, Materials Research Forum LLC,
2025, doi:10.21741/9781644903551-42.'
short: 'K. Yang, M. Biegler, L. Happe, M. Striewe, V. Olfert, D. Hein, M. Rethmeier,
G. Meschut, in: Materials Research Proceedings, Materials Research Forum LLC,
2025.'
date_created: 2025-03-25T07:59:49Z
date_updated: 2025-12-26T13:44:36Z
ddc:
- '600'
department:
- _id: '157'
doi: 10.21741/9781644903551-42
file:
- access_level: closed
content_type: application/pdf
creator: kekeyang
date_created: 2025-03-25T08:02:30Z
date_updated: 2025-03-25T08:02:30Z
file_id: '59092'
file_name: Shemat.pdf
file_size: 1901767
relation: main_file
success: 1
file_date_updated: 2025-03-25T08:02:30Z
has_accepted_license: '1'
intvolume: ' 52'
language:
- iso: eng
license: https://creativecommons.org/licenses/by-nc/3.0/
main_file_link:
- open_access: '1'
oa: '1'
publication: Materials Research Proceedings
publication_identifier:
issn:
- 2474-395X
publication_status: published
publisher: Materials Research Forum LLC
quality_controlled: '1'
status: public
title: 'Influence of Liquid metal embrittlement on load-bearing capacity of resistance
spot welds under crash loads: A study based on S-Rail components'
type: conference
user_id: '65085'
volume: 52
year: '2025'
...
---
_id: '60604'
abstract:
- lang: eng
text: Abstract. In the field of online condition monitoring, non-destructive
testing methods using active acoustic testing [1] emerged as innovative tools.
These techniques are particularly effective because damage in joined structures
leads to significant changes in their vibrational characteristics. However, the
consistent use of online condition monitoring through active acoustic testing
combined with complex pattern recognition for early crack detection in joined
components has not yet been fully established. This research aims to develop an
online crack detection system employing pattern recognition techniques under cyclic
loading during fatigue tests, utilizing non-contact active acoustic testing with
laser vibrometry. Due to the wide range of materials that can be joined, mechanical
joining processes can be used in many different industry branches. Self-pierce
riveting (SPR), in particular, is a well-established joining process. Therefore,
the investigations for online crack detection initially focus on SPR joints. To
achieve this, the fatigue behavior of SPR joints in a lap-shear configuration
was characterized. Experimental fatigue testing demonstrated that SPR joint failure
occurs either through cracks propagating in the sheet material away from the rivet
or in the rivet foot, depending on the material combination. Laser vibrometry
has been successfully used as a crack detection system and has proven to be effective
in detecting crack initiation in SPR joints. Cracks can be detected without contact
regardless of the material combination, the damage location, the size of the damage,
or the type of damage. The optimization of the crack detection system involved
several key enhancements, including adjusting data acquisition to improve crack
detection, incorporating principal component analysis (PCA) to reduce dimensionality,
and implementing a classification model based on a global training dataset. An
intuitive, problem-specific software demonstrator for analyzing the crack initiation
behavior of SPR joints under cyclic loading was developed and iteratively optimized.
Future work will focus on the implementation of an autoencoder network to further
enhance crack detection capabilities.
author:
- first_name: Viktoria
full_name: Olfert, Viktoria
id: '5974'
last_name: Olfert
- first_name: Keke
full_name: Yang, Keke
id: '65085'
last_name: Yang
orcid: 0000-0001-9201-9304
- first_name: Maik
full_name: Gollnick, Maik
last_name: Gollnick
- first_name: Jacob
full_name: Krause, Jacob
last_name: Krause
- first_name: David
full_name: Hein, David
id: '7728'
last_name: Hein
- first_name: Gerson
full_name: Meschut, Gerson
id: '32056'
last_name: Meschut
orcid: 0000-0002-2763-1246
citation:
ama: 'Olfert V, Yang K, Gollnick M, Krause J, Hein D, Meschut G. Analysis of fatigue
behaviour of self-piercing riveted joints under cyclic loading using laser vibrometry.
In: Materials Research Proceedings. Vol 54. Materials Research Forum LLC;
2025. doi:10.21741/9781644903599-154'
apa: Olfert, V., Yang, K., Gollnick, M., Krause, J., Hein, D., & Meschut, G.
(2025). Analysis of fatigue behaviour of self-piercing riveted joints under cyclic
loading using laser vibrometry. Materials Research Proceedings, 54.
https://doi.org/10.21741/9781644903599-154
bibtex: '@inproceedings{Olfert_Yang_Gollnick_Krause_Hein_Meschut_2025, title={Analysis
of fatigue behaviour of self-piercing riveted joints under cyclic loading using
laser vibrometry}, volume={54}, DOI={10.21741/9781644903599-154},
booktitle={Materials Research Proceedings}, publisher={Materials Research Forum
LLC}, author={Olfert, Viktoria and Yang, Keke and Gollnick, Maik and Krause, Jacob
and Hein, David and Meschut, Gerson}, year={2025} }'
chicago: Olfert, Viktoria, Keke Yang, Maik Gollnick, Jacob Krause, David Hein, and
Gerson Meschut. “Analysis of Fatigue Behaviour of Self-Piercing Riveted Joints
under Cyclic Loading Using Laser Vibrometry.” In Materials Research Proceedings,
Vol. 54. Materials Research Forum LLC, 2025. https://doi.org/10.21741/9781644903599-154.
ieee: 'V. Olfert, K. Yang, M. Gollnick, J. Krause, D. Hein, and G. Meschut, “Analysis
of fatigue behaviour of self-piercing riveted joints under cyclic loading using
laser vibrometry,” in Materials Research Proceedings, 2025, vol. 54, doi:
10.21741/9781644903599-154.'
mla: Olfert, Viktoria, et al. “Analysis of Fatigue Behaviour of Self-Piercing Riveted
Joints under Cyclic Loading Using Laser Vibrometry.” Materials Research Proceedings,
vol. 54, Materials Research Forum LLC, 2025, doi:10.21741/9781644903599-154.
short: 'V. Olfert, K. Yang, M. Gollnick, J. Krause, D. Hein, G. Meschut, in: Materials
Research Proceedings, Materials Research Forum LLC, 2025.'
date_created: 2025-07-14T13:25:26Z
date_updated: 2025-12-26T13:45:01Z
department:
- _id: '157'
doi: 10.21741/9781644903599-154
intvolume: ' 54'
language:
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main_file_link:
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oa: '1'
publication: Materials Research Proceedings
publication_identifier:
issn:
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publication_status: published
publisher: Materials Research Forum LLC
quality_controlled: '1'
status: public
title: Analysis of fatigue behaviour of self-piercing riveted joints under cyclic
loading using laser vibrometry
type: conference
user_id: '65085'
volume: 54
year: '2025'
...
---
_id: '63434'
author:
- first_name: Max
full_name: Hoffmann, Max
last_name: Hoffmann
citation:
ama: 'Hoffmann M. Using scriptwriting as a response format for interface tasks:
Exemplary analyses in the context of symmetry. In: Bosch M, Bolondi G, Carreira
S, Michael G, Camilla S, eds. Proceedings of the Fourteenth Congress of the
European Society for Research in Mathematics Education (CERME14). ; 2025.'
apa: 'Hoffmann, M. (2025). Using scriptwriting as a response format for interface
tasks: Exemplary analyses in the context of symmetry. In M. Bosch, G. Bolondi,
S. Carreira, G. Michael, & S. Camilla (Eds.), Proceedings of the Fourteenth
Congress of the European Society for Research in Mathematics Education (CERME14).'
bibtex: '@inproceedings{Hoffmann_2025, title={Using scriptwriting as a response
format for interface tasks: Exemplary analyses in the context of symmetry}, booktitle={Proceedings
of the Fourteenth Congress of the European Society for Research in Mathematics
Education (CERME14)}, author={Hoffmann, Max}, editor={Bosch, Marianna and Bolondi,
Giorgio and Carreira, Susana and Michael, Gaidoschik and Camilla, Spagnolo}, year={2025}
}'
chicago: 'Hoffmann, Max. “Using Scriptwriting as a Response Format for Interface
Tasks: Exemplary Analyses in the Context of Symmetry.” In Proceedings of the
Fourteenth Congress of the European Society for Research in Mathematics Education
(CERME14), edited by Marianna Bosch, Giorgio Bolondi, Susana Carreira, Gaidoschik
Michael, and Spagnolo Camilla, 2025.'
ieee: 'M. Hoffmann, “Using scriptwriting as a response format for interface tasks:
Exemplary analyses in the context of symmetry,” in Proceedings of the Fourteenth
Congress of the European Society for Research in Mathematics Education (CERME14),
2025.'
mla: 'Hoffmann, Max. “Using Scriptwriting as a Response Format for Interface Tasks:
Exemplary Analyses in the Context of Symmetry.” Proceedings of the Fourteenth
Congress of the European Society for Research in Mathematics Education (CERME14),
edited by Marianna Bosch et al., 2025.'
short: 'M. Hoffmann, in: M. Bosch, G. Bolondi, S. Carreira, G. Michael, S. Camilla
(Eds.), Proceedings of the Fourteenth Congress of the European Society for Research
in Mathematics Education (CERME14), 2025.'
date_created: 2026-01-04T21:26:04Z
date_updated: 2026-01-04T21:29:36Z
department:
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- _id: '643'
editor:
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full_name: Bosch, Marianna
last_name: Bosch
- first_name: Giorgio
full_name: Bolondi, Giorgio
last_name: Bolondi
- first_name: Susana
full_name: Carreira, Susana
last_name: Carreira
- first_name: Gaidoschik
full_name: Michael, Gaidoschik
last_name: Michael
- first_name: Spagnolo
full_name: Camilla, Spagnolo
last_name: Camilla
keyword:
- hoffmann
- reviewed
- proceedings
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://hal.science/CERME14/hal-05237875v1
oa: '1'
publication: Proceedings of the Fourteenth Congress of the European Society for Research
in Mathematics Education (CERME14)
quality_controlled: '1'
status: public
title: 'Using scriptwriting as a response format for interface tasks: Exemplary analyses
in the context of symmetry'
type: conference
user_id: '32202'
year: '2025'
...