---
_id: '65738'
author:
- first_name: Alexander
full_name: Kirsch, Alexander
id: '59797'
last_name: Kirsch
orcid: 0000-0003-1650-0440
- first_name: Frank
full_name: Hellmich, Frank
id: '26282'
last_name: Hellmich
- first_name: Eva
full_name: Blumberg, Eva
id: '37549'
last_name: Blumberg
orcid: 0009-0004-1651-541X
- first_name: Ricardo
full_name: Puppe, Ricardo
id: '103297'
last_name: Puppe
citation:
ama: 'Kirsch A, Hellmich F, Blumberg E, Puppe R. Wie kommt der „grüne“ Strom in
die Steckdose? – Eine multidimensionale Analyse der Vorstellungen von Grundschulkindern
zu nachhaltiger Energienutzung. In: Beudels M, Henrichwark C, eds. Vorstellungen
von Kindern Zu Themenfeldern Der Nachhaltigkeit. Klinkhardt; 2026:288-304.'
apa: Kirsch, A., Hellmich, F., Blumberg, E., & Puppe, R. (2026). Wie kommt der
„grüne“ Strom in die Steckdose? – Eine multidimensionale Analyse der Vorstellungen
von Grundschulkindern zu nachhaltiger Energienutzung. In M. Beudels & C. Henrichwark
(Eds.), Vorstellungen von Kindern zu Themenfeldern der Nachhaltigkeit (pp.
288–304). Klinkhardt.
bibtex: '@inbook{Kirsch_Hellmich_Blumberg_Puppe_2026, title={Wie kommt der „grüne“
Strom in die Steckdose? – Eine multidimensionale Analyse der Vorstellungen von
Grundschulkindern zu nachhaltiger Energienutzung}, booktitle={Vorstellungen von
Kindern zu Themenfeldern der Nachhaltigkeit}, publisher={Klinkhardt}, author={Kirsch,
Alexander and Hellmich, Frank and Blumberg, Eva and Puppe, Ricardo}, editor={Beudels,
M and Henrichwark, C}, year={2026}, pages={288–304} }'
chicago: Kirsch, Alexander, Frank Hellmich, Eva Blumberg, and Ricardo Puppe. “Wie
Kommt Der „grüne“ Strom in Die Steckdose? – Eine Multidimensionale Analyse Der
Vorstellungen von Grundschulkindern Zu Nachhaltiger Energienutzung.” In Vorstellungen
von Kindern Zu Themenfeldern Der Nachhaltigkeit, edited by M Beudels and C
Henrichwark, 288–304. Klinkhardt, 2026.
ieee: A. Kirsch, F. Hellmich, E. Blumberg, and R. Puppe, “Wie kommt der „grüne“
Strom in die Steckdose? – Eine multidimensionale Analyse der Vorstellungen von
Grundschulkindern zu nachhaltiger Energienutzung,” in Vorstellungen von Kindern
zu Themenfeldern der Nachhaltigkeit, M. Beudels and C. Henrichwark, Eds. Klinkhardt,
2026, pp. 288–304.
mla: Kirsch, Alexander, et al. “Wie Kommt Der „grüne“ Strom in Die Steckdose? –
Eine Multidimensionale Analyse Der Vorstellungen von Grundschulkindern Zu Nachhaltiger
Energienutzung.” Vorstellungen von Kindern Zu Themenfeldern Der Nachhaltigkeit,
edited by M Beudels and C Henrichwark, Klinkhardt, 2026, pp. 288–304.
short: 'A. Kirsch, F. Hellmich, E. Blumberg, R. Puppe, in: M. Beudels, C. Henrichwark
(Eds.), Vorstellungen von Kindern Zu Themenfeldern Der Nachhaltigkeit, Klinkhardt,
2026, pp. 288–304.'
date_created: 2026-06-01T07:03:58Z
date_updated: 2026-06-01T07:04:07Z
department:
- _id: '460'
editor:
- first_name: M
full_name: Beudels, M
last_name: Beudels
- first_name: C
full_name: Henrichwark, C
last_name: Henrichwark
language:
- iso: eng
page: 288-304
publication: Vorstellungen von Kindern zu Themenfeldern der Nachhaltigkeit
publisher: Klinkhardt
status: public
title: Wie kommt der „grüne“ Strom in die Steckdose? – Eine multidimensionale Analyse
der Vorstellungen von Grundschulkindern zu nachhaltiger Energienutzung
type: book_chapter
user_id: '57672'
year: '2026'
...
---
_id: '65739'
article_number: '16.5'
author:
- first_name: Volker
full_name: Garske, Volker
id: '162'
last_name: Garske
citation:
ama: Garske V. Schattenprinzip und Klimawandel - Entwicklungschancen für Lehrende
und Lernende im Kontext des Ökologischen Lernens, erarbeitet am Beispiel der Massentierhaltung
. Handbuch der Religionen. 2026;(88).
apa: Garske, V. (2026). Schattenprinzip und Klimawandel - Entwicklungschancen für
Lehrende und Lernende im Kontext des Ökologischen Lernens, erarbeitet am Beispiel
der Massentierhaltung . Handbuch Der Religionen, 88, Article 16.5.
bibtex: '@article{Garske_2026, title={Schattenprinzip und Klimawandel - Entwicklungschancen
für Lehrende und Lernende im Kontext des Ökologischen Lernens, erarbeitet am Beispiel
der Massentierhaltung }, number={8816.5}, journal={Handbuch der Religionen}, publisher={Westarp
Science}, author={Garske, Volker}, year={2026} }'
chicago: Garske, Volker. “Schattenprinzip Und Klimawandel - Entwicklungschancen
Für Lehrende Und Lernende Im Kontext Des Ökologischen Lernens, Erarbeitet Am Beispiel
Der Massentierhaltung .” Handbuch Der Religionen, no. 88 (2026).
ieee: V. Garske, “Schattenprinzip und Klimawandel - Entwicklungschancen für Lehrende
und Lernende im Kontext des Ökologischen Lernens, erarbeitet am Beispiel der Massentierhaltung
,” Handbuch der Religionen, no. 88, Art. no. 16.5, 2026.
mla: Garske, Volker. “Schattenprinzip Und Klimawandel - Entwicklungschancen Für
Lehrende Und Lernende Im Kontext Des Ökologischen Lernens, Erarbeitet Am Beispiel
Der Massentierhaltung .” Handbuch Der Religionen, no. 88, 16.5, Westarp
Science, 2026.
short: V. Garske, Handbuch Der Religionen (2026).
date_created: 2026-06-01T07:14:59Z
date_updated: 2026-06-01T07:15:38Z
department:
- _id: '36'
issue: '88'
language:
- iso: eng
publication: Handbuch der Religionen
publication_identifier:
unknown:
- 'ISBN: 978-3-86617-521-1 '
publisher: Westarp Science
quality_controlled: '1'
status: public
title: 'Schattenprinzip und Klimawandel - Entwicklungschancen für Lehrende und Lernende
im Kontext des Ökologischen Lernens, erarbeitet am Beispiel der Massentierhaltung '
type: journal_article
user_id: '162'
year: '2026'
...
---
_id: '65736'
author:
- first_name: Louis Mozart
full_name: Kamdem Teyou, Louis Mozart
id: '101165'
last_name: Kamdem Teyou
- first_name: Caglar
full_name: Demir, Caglar
last_name: Demir
- first_name: Axel-Cyrille
full_name: Ngonga Ngomo, Axel-Cyrille
id: '65716'
last_name: Ngonga Ngomo
citation:
ama: 'Kamdem Teyou LM, Demir C, Ngonga Ngomo A-C. Semantics-Aware Caching for Concept
Learning. In: Lecture Notes in Computer Science. Springer Nature Switzerland;
2026. doi:10.1007/978-3-032-25156-5_26'
apa: Kamdem Teyou, L. M., Demir, C., & Ngonga Ngomo, A.-C. (2026). Semantics-Aware
Caching for Concept Learning. In Lecture Notes in Computer Science. Springer
Nature Switzerland. https://doi.org/10.1007/978-3-032-25156-5_26
bibtex: '@inbook{Kamdem Teyou_Demir_Ngonga Ngomo_2026, place={Cham}, title={Semantics-Aware
Caching for Concept Learning}, DOI={10.1007/978-3-032-25156-5_26},
booktitle={Lecture Notes in Computer Science}, publisher={Springer Nature Switzerland},
author={Kamdem Teyou, Louis Mozart and Demir, Caglar and Ngonga Ngomo, Axel-Cyrille},
year={2026} }'
chicago: 'Kamdem Teyou, Louis Mozart, Caglar Demir, and Axel-Cyrille Ngonga Ngomo.
“Semantics-Aware Caching for Concept Learning.” In Lecture Notes in Computer
Science. Cham: Springer Nature Switzerland, 2026. https://doi.org/10.1007/978-3-032-25156-5_26.'
ieee: 'L. M. Kamdem Teyou, C. Demir, and A.-C. Ngonga Ngomo, “Semantics-Aware Caching
for Concept Learning,” in Lecture Notes in Computer Science, Cham: Springer
Nature Switzerland, 2026.'
mla: Kamdem Teyou, Louis Mozart, et al. “Semantics-Aware Caching for Concept Learning.”
Lecture Notes in Computer Science, Springer Nature Switzerland, 2026, doi:10.1007/978-3-032-25156-5_26.
short: 'L.M. Kamdem Teyou, C. Demir, A.-C. Ngonga Ngomo, in: Lecture Notes in Computer
Science, Springer Nature Switzerland, Cham, 2026.'
date_created: 2026-05-29T14:22:42Z
date_updated: 2026-05-29T14:23:47Z
doi: 10.1007/978-3-032-25156-5_26
language:
- iso: eng
place: Cham
publication: Lecture Notes in Computer Science
publication_identifier:
isbn:
- '9783032251558'
- '9783032251565'
issn:
- 0302-9743
- 1611-3349
publication_status: published
publisher: Springer Nature Switzerland
status: public
title: Semantics-Aware Caching for Concept Learning
type: book_chapter
user_id: '101165'
year: '2026'
...
---
_id: '65735'
author:
- first_name: Isaac
full_name: Roberts, Isaac
last_name: Roberts
- first_name: Louis Mozart
full_name: Kamdem Teyou, Louis Mozart
id: '101165'
last_name: Kamdem Teyou
- first_name: Alexander
full_name: Schulz, Alexander
last_name: Schulz
- first_name: N'Dah Jean
full_name: Kouagou, N'Dah Jean
last_name: Kouagou
- first_name: Axel-Cyrille
full_name: Ngonga Ngomo, Axel-Cyrille
id: '65716'
last_name: Ngonga Ngomo
- first_name: Barbara
full_name: Hammer, Barbara
last_name: Hammer
citation:
ama: 'Roberts I, Kamdem Teyou LM, Schulz A, Kouagou NJ, Ngonga Ngomo A-C, Hammer
B. A Possible Human-Centered Embedding Space Search in Degenerate Clifford Algebras.
In: ESANN 2026 Proceedings. Ciaco - i6doc.com; 2026. doi:10.14428/esann/2026.es2026-283'
apa: Roberts, I., Kamdem Teyou, L. M., Schulz, A., Kouagou, N. J., Ngonga Ngomo,
A.-C., & Hammer, B. (2026). A Possible Human-Centered Embedding Space Search
in Degenerate Clifford Algebras. ESANN 2026 Proceedings. https://doi.org/10.14428/esann/2026.es2026-283
bibtex: '@inproceedings{Roberts_Kamdem Teyou_Schulz_Kouagou_Ngonga Ngomo_Hammer_2026,
title={A Possible Human-Centered Embedding Space Search in Degenerate Clifford
Algebras}, DOI={10.14428/esann/2026.es2026-283},
booktitle={ESANN 2026 proceedings}, publisher={Ciaco - i6doc.com}, author={Roberts,
Isaac and Kamdem Teyou, Louis Mozart and Schulz, Alexander and Kouagou, N’Dah
Jean and Ngonga Ngomo, Axel-Cyrille and Hammer, Barbara}, year={2026} }'
chicago: Roberts, Isaac, Louis Mozart Kamdem Teyou, Alexander Schulz, N’Dah Jean
Kouagou, Axel-Cyrille Ngonga Ngomo, and Barbara Hammer. “A Possible Human-Centered
Embedding Space Search in Degenerate Clifford Algebras.” In ESANN 2026 Proceedings.
Ciaco - i6doc.com, 2026. https://doi.org/10.14428/esann/2026.es2026-283.
ieee: 'I. Roberts, L. M. Kamdem Teyou, A. Schulz, N. J. Kouagou, A.-C. Ngonga Ngomo,
and B. Hammer, “A Possible Human-Centered Embedding Space Search in Degenerate
Clifford Algebras,” 2026, doi: 10.14428/esann/2026.es2026-283.'
mla: Roberts, Isaac, et al. “A Possible Human-Centered Embedding Space Search in
Degenerate Clifford Algebras.” ESANN 2026 Proceedings, Ciaco - i6doc.com,
2026, doi:10.14428/esann/2026.es2026-283.
short: 'I. Roberts, L.M. Kamdem Teyou, A. Schulz, N.J. Kouagou, A.-C. Ngonga Ngomo,
B. Hammer, in: ESANN 2026 Proceedings, Ciaco - i6doc.com, 2026.'
date_created: 2026-05-29T14:18:30Z
date_updated: 2026-05-29T14:23:40Z
doi: 10.14428/esann/2026.es2026-283
language:
- iso: eng
publication: ESANN 2026 proceedings
publication_status: published
publisher: Ciaco - i6doc.com
status: public
title: A Possible Human-Centered Embedding Space Search in Degenerate Clifford Algebras
type: conference
user_id: '101165'
year: '2026'
...
---
_id: '65741'
abstract:
- lang: eng
text: "\r\n This work investigates the temperature dependence
of the lattice constant\r\n a\r\n
\ exp\r\n of cubic GaN/3C‐SiC/Si
(001) epilayers grown at 740°C by plasma‐assisted molecular beam epitaxy is investigated.
High resolution X‐ray diffraction is performed to determine the lattice constant,
using an Anton–Paar DHS1100 stage to vary the sample temperature from 25°C to
900°C, calibrated against the underlying single‐crystalline silicon substrate.
A linear increase in\r\n a\r\n exp\r\n
\ with rising temperature is observed. The thermal expansion
behaviour is modelled using Debye´s phonon dispersion. The fitted lattice parameters
are used to calculate the thermal expansion coefficient (TEC). At room temperature
the TEC is determined to be\r\n α\r\n
\ Debye \r\n ≈ 5.25
× 10\r\n −6\r\n K\r\n
\ −1\r\n . We further
compare the TEC of the cubic GaN epilayer to that of free‐standing hexagonal GaN
using the crystallographic relationship of , demonstrating good agreement between
both phases. Using literature values for the elastic constants of cubic GaN, the
corresponding elastic moduli and Debye temperature Θ\r\n D\r\n
\ are calculated. An average value of Θ\r\n D\r\n
\ of ≈905 ± 25 K is obtained, which is very close to our experimental
results. Moreover, tensile strain is found to be present in our sample at room
temperature, leading to an increase in the TEC. The impact of strain on the thermal
properties of cubic GaN is discussed.\r\n "
article_number: e202500477
article_type: original
author:
- first_name: Donat Josef
full_name: As, Donat Josef
id: '14'
last_name: As
orcid: 0000-0003-1121-3565
- first_name: Falco
full_name: Meier, Falco
last_name: Meier
- first_name: Pascal
full_name: Mahler, Pascal
last_name: Mahler
- first_name: Cedrik
full_name: Meier, Cedrik
id: '20798'
last_name: Meier
orcid: https://orcid.org/0000-0002-3787-3572
citation:
ama: As DJ, Meier F, Mahler P, Meier C. X‐Ray Investigation of the Thermal Expansion
Coefficient of Cubic Gallium Nitride on 3C‐SiC (001)/Si (001) Substrates. physica
status solidi (b). 2026;263(2). doi:10.1002/pssb.202500477
apa: As, D. J., Meier, F., Mahler, P., & Meier, C. (2026). X‐Ray Investigation
of the Thermal Expansion Coefficient of Cubic Gallium Nitride on 3C‐SiC (001)/Si
(001) Substrates. Physica Status Solidi (b), 263(2), Article e202500477.
https://doi.org/10.1002/pssb.202500477
bibtex: '@article{As_Meier_Mahler_Meier_2026, title={X‐Ray Investigation of the
Thermal Expansion Coefficient of Cubic Gallium Nitride on 3C‐SiC (001)/Si (001)
Substrates}, volume={263}, DOI={10.1002/pssb.202500477},
number={2e202500477}, journal={physica status solidi (b)}, publisher={Wiley},
author={As, Donat Josef and Meier, Falco and Mahler, Pascal and Meier, Cedrik},
year={2026} }'
chicago: As, Donat Josef, Falco Meier, Pascal Mahler, and Cedrik Meier. “X‐Ray Investigation
of the Thermal Expansion Coefficient of Cubic Gallium Nitride on 3C‐SiC (001)/Si
(001) Substrates.” Physica Status Solidi (b) 263, no. 2 (2026). https://doi.org/10.1002/pssb.202500477.
ieee: 'D. J. As, F. Meier, P. Mahler, and C. Meier, “X‐Ray Investigation of the
Thermal Expansion Coefficient of Cubic Gallium Nitride on 3C‐SiC (001)/Si (001)
Substrates,” physica status solidi (b), vol. 263, no. 2, Art. no. e202500477,
2026, doi: 10.1002/pssb.202500477.'
mla: As, Donat Josef, et al. “X‐Ray Investigation of the Thermal Expansion Coefficient
of Cubic Gallium Nitride on 3C‐SiC (001)/Si (001) Substrates.” Physica Status
Solidi (b), vol. 263, no. 2, e202500477, Wiley, 2026, doi:10.1002/pssb.202500477.
short: D.J. As, F. Meier, P. Mahler, C. Meier, Physica Status Solidi (b) 263 (2026).
date_created: 2026-06-01T09:22:04Z
date_updated: 2026-06-01T09:23:41Z
department:
- _id: '15'
doi: 10.1002/pssb.202500477
intvolume: ' 263'
issue: '2'
language:
- iso: eng
publication: physica status solidi (b)
publication_identifier:
issn:
- 0370-1972
- 1521-3951
publication_status: published
publisher: Wiley
status: public
title: X‐Ray Investigation of the Thermal Expansion Coefficient of Cubic Gallium Nitride
on 3C‐SiC (001)/Si (001) Substrates
type: journal_article
user_id: '20798'
volume: 263
year: '2026'
...
---
_id: '65745'
abstract:
- lang: eng
text: "Abstract\r\n In this work,
we address the numerical identification of entanglement in dynamical scenarios.
To this end, we consider different programs based on the restriction of the evolution
to the set of separable (i.e., non-entangled) states, together with the discretization
of the space of variables for numerical computations. As a first approach, we
apply linear splitting methods to the restricted, continuous equations of motion
derived from variational principles. We utilize an exchange interaction Hamiltonian
to confirm that the numerical and analytical solutions coincide in the limit of
small time steps. The application to different Hamiltonians shows the wide applicability
of the method to detect dynamical entanglement. To avoid the derivation of analytical
solutions for complex dynamics, we consider variational, numerical integration
schemes, introducing a variational discretization for Lagrangians linear in velocities.
Here, we examine and compare two approaches: one in which the system is discretized
before the restriction is applied, and another in which the restriction precedes
the discretization. We find that the \"first-discretize-then-restrict\" method
becomes numerically unstable, already for the example of an exchange-interaction
Hamiltonian, which can be an important consideration for the numerical analysis
of constrained quantum dynamics. Thereby, broadly applicable numerical tools,
including their limitations, for studying entanglement over time are established
for assessing the entangling power of processes that are used in quantum information
theory."
author:
- first_name: Christian
full_name: Offen, Christian
last_name: Offen
- first_name: Boris
full_name: Wembe, Boris
last_name: Wembe
- first_name: Laura
full_name: Ares, Laura
last_name: Ares
- first_name: Jan
full_name: Sperling, Jan
last_name: Sperling
- first_name: Sina
full_name: Ober-Blöbaum, Sina
last_name: Ober-Blöbaum
citation:
ama: 'Offen C, Wembe B, Ares L, Sperling J, Ober-Blöbaum S. Numerical approaches
to entangling dynamics from variational principles. Journal of Physics A: Mathematical
and Theoretical. Published online 2026. doi:10.1088/1751-8121/ae6d51'
apa: 'Offen, C., Wembe, B., Ares, L., Sperling, J., & Ober-Blöbaum, S. (2026).
Numerical approaches to entangling dynamics from variational principles. Journal
of Physics A: Mathematical and Theoretical. https://doi.org/10.1088/1751-8121/ae6d51'
bibtex: '@article{Offen_Wembe_Ares_Sperling_Ober-Blöbaum_2026, title={Numerical
approaches to entangling dynamics from variational principles}, DOI={10.1088/1751-8121/ae6d51},
journal={Journal of Physics A: Mathematical and Theoretical}, publisher={IOP Publishing},
author={Offen, Christian and Wembe, Boris and Ares, Laura and Sperling, Jan and
Ober-Blöbaum, Sina}, year={2026} }'
chicago: 'Offen, Christian, Boris Wembe, Laura Ares, Jan Sperling, and Sina Ober-Blöbaum.
“Numerical Approaches to Entangling Dynamics from Variational Principles.” Journal
of Physics A: Mathematical and Theoretical, 2026. https://doi.org/10.1088/1751-8121/ae6d51.'
ieee: 'C. Offen, B. Wembe, L. Ares, J. Sperling, and S. Ober-Blöbaum, “Numerical
approaches to entangling dynamics from variational principles,” Journal of
Physics A: Mathematical and Theoretical, 2026, doi: 10.1088/1751-8121/ae6d51.'
mla: 'Offen, Christian, et al. “Numerical Approaches to Entangling Dynamics from
Variational Principles.” Journal of Physics A: Mathematical and Theoretical,
IOP Publishing, 2026, doi:10.1088/1751-8121/ae6d51.'
short: 'C. Offen, B. Wembe, L. Ares, J. Sperling, S. Ober-Blöbaum, Journal of Physics
A: Mathematical and Theoretical (2026).'
date_created: 2026-06-01T09:36:09Z
date_updated: 2026-06-01T09:36:17Z
department:
- _id: '94'
doi: 10.1088/1751-8121/ae6d51
language:
- iso: eng
publication: 'Journal of Physics A: Mathematical and Theoretical'
publication_identifier:
issn:
- 1751-8113
- 1751-8121
publication_status: published
publisher: IOP Publishing
status: public
title: Numerical approaches to entangling dynamics from variational principles
type: journal_article
user_id: '95394'
year: '2026'
...
---
_id: '65742'
abstract:
- lang: eng
text: "Abstract\r\n In this work,
we address the numerical identification of entanglement in dynamical scenarios.
To this end, we consider different programs based on the restriction of the evolution
to the set of separable (i.e., non-entangled) states, together with the discretization
of the space of variables for numerical computations. As a first approach, we
apply linear splitting methods to the restricted, continuous equations of motion
derived from variational principles. We utilize an exchange interaction Hamiltonian
to confirm that the numerical and analytical solutions coincide in the limit of
small time steps. The application to different Hamiltonians shows the wide applicability
of the method to detect dynamical entanglement. To avoid the derivation of analytical
solutions for complex dynamics, we consider variational, numerical integration
schemes, introducing a variational discretization for Lagrangians linear in velocities.
Here, we examine and compare two approaches: one in which the system is discretized
before the restriction is applied, and another in which the restriction precedes
the discretization. We find that the \"first-discretize-then-restrict\" method
becomes numerically unstable, already for the example of an exchange-interaction
Hamiltonian, which can be an important consideration for the numerical analysis
of constrained quantum dynamics. Thereby, broadly applicable numerical tools,
including their limitations, for studying entanglement over time are established
for assessing the entangling power of processes that are used in quantum information
theory."
author:
- first_name: Christian
full_name: Offen, Christian
last_name: Offen
- first_name: Boris
full_name: Wembe, Boris
last_name: Wembe
- first_name: Laura
full_name: Ares, Laura
last_name: Ares
- first_name: Jan
full_name: Sperling, Jan
last_name: Sperling
- first_name: Sina
full_name: Ober-Blöbaum, Sina
last_name: Ober-Blöbaum
citation:
ama: 'Offen C, Wembe B, Ares L, Sperling J, Ober-Blöbaum S. Numerical approaches
to entangling dynamics from variational principles. Journal of Physics A: Mathematical
and Theoretical. Published online 2026. doi:10.1088/1751-8121/ae6d51'
apa: 'Offen, C., Wembe, B., Ares, L., Sperling, J., & Ober-Blöbaum, S. (2026).
Numerical approaches to entangling dynamics from variational principles. Journal
of Physics A: Mathematical and Theoretical. https://doi.org/10.1088/1751-8121/ae6d51'
bibtex: '@article{Offen_Wembe_Ares_Sperling_Ober-Blöbaum_2026, title={Numerical
approaches to entangling dynamics from variational principles}, DOI={10.1088/1751-8121/ae6d51},
journal={Journal of Physics A: Mathematical and Theoretical}, publisher={IOP Publishing},
author={Offen, Christian and Wembe, Boris and Ares, Laura and Sperling, Jan and
Ober-Blöbaum, Sina}, year={2026} }'
chicago: 'Offen, Christian, Boris Wembe, Laura Ares, Jan Sperling, and Sina Ober-Blöbaum.
“Numerical Approaches to Entangling Dynamics from Variational Principles.” Journal
of Physics A: Mathematical and Theoretical, 2026. https://doi.org/10.1088/1751-8121/ae6d51.'
ieee: 'C. Offen, B. Wembe, L. Ares, J. Sperling, and S. Ober-Blöbaum, “Numerical
approaches to entangling dynamics from variational principles,” Journal of
Physics A: Mathematical and Theoretical, 2026, doi: 10.1088/1751-8121/ae6d51.'
mla: 'Offen, Christian, et al. “Numerical Approaches to Entangling Dynamics from
Variational Principles.” Journal of Physics A: Mathematical and Theoretical,
IOP Publishing, 2026, doi:10.1088/1751-8121/ae6d51.'
short: 'C. Offen, B. Wembe, L. Ares, J. Sperling, S. Ober-Blöbaum, Journal of Physics
A: Mathematical and Theoretical (2026).'
date_created: 2026-06-01T09:29:01Z
date_updated: 2026-06-01T09:29:29Z
department:
- _id: '94'
doi: 10.1088/1751-8121/ae6d51
language:
- iso: eng
publication: 'Journal of Physics A: Mathematical and Theoretical'
publication_identifier:
issn:
- 1751-8113
- 1751-8121
publication_status: published
publisher: IOP Publishing
status: public
title: Numerical approaches to entangling dynamics from variational principles
type: journal_article
user_id: '95394'
year: '2026'
...
---
_id: '65746'
abstract:
- lang: eng
text: This paper presents a class of structure-preserving numerical methods for
quantum optimal control problems, based on commutator-free Cayley integrators.
Starting from the Krotov framework, we reformulate the forward and backward propagation
steps using Cayley-type schemes that preserve unitarity and symmetry at the discrete
level. This approach eliminates the need for matrix exponentials and commutators,
leading to significant computational savings while maintaining higher-order accuracy.
We first recall the standard linear setting and then extend the formulation to
nonlinear Schrödinger and Gross-Pitaevskii equations using a Cayley-polynomial
interpolation strategy. Numerical experiments on state-transfer problems illustrate
that the CF-Cayley method achieves the same accuracy as high-order exponential
or Cayley-Magnus schemes at substantially lower cost, especially for longtime
or highly oscillatory dynamics. In the nonlinear regime, the structure-preserving
properties of the method ensure stability and norm conservation, making it a robust
tool for large-scale quantum control simulations. The proposed framework thus
bridges geometric integration and optimal control, offering an efficient and reliable
alternative to existing exponential-based propagators.
author:
- first_name: Boris Edgar
full_name: Wembe Moafo, Boris Edgar
id: '95394'
last_name: Wembe Moafo
orcid: 0000-0002-6085-8071
- first_name: Usman
full_name: Ali, Usman
last_name: Ali
- first_name: Torsten
full_name: Meier, Torsten
id: '344'
last_name: Meier
orcid: 0000-0001-8864-2072
- first_name: Sina
full_name: Ober-Blöbaum, Sina
id: '16494'
last_name: Ober-Blöbaum
citation:
ama: 'Wembe Moafo BE, Ali U, Meier T, Ober-Blöbaum S. Cayley Commutator-free Methods
for Krotov-Type Algorithms in Quantum Optimal Control. In: ; 2026. doi:10.48550/ARXIV.2603.11697'
apa: Wembe Moafo, B. E., Ali, U., Meier, T., & Ober-Blöbaum, S. (2026). Cayley
Commutator-free Methods for Krotov-Type Algorithms in Quantum Optimal Control.
European Control Conference, Reykjavík, Iceland. https://doi.org/10.48550/ARXIV.2603.11697
bibtex: '@inproceedings{Wembe Moafo_Ali_Meier_Ober-Blöbaum_2026, title={Cayley Commutator-free
Methods for Krotov-Type Algorithms in Quantum Optimal Control}, DOI={10.48550/ARXIV.2603.11697},
author={Wembe Moafo, Boris Edgar and Ali, Usman and Meier, Torsten and Ober-Blöbaum,
Sina}, year={2026} }'
chicago: Wembe Moafo, Boris Edgar, Usman Ali, Torsten Meier, and Sina Ober-Blöbaum.
“Cayley Commutator-Free Methods for Krotov-Type Algorithms in Quantum Optimal
Control,” 2026. https://doi.org/10.48550/ARXIV.2603.11697.
ieee: 'B. E. Wembe Moafo, U. Ali, T. Meier, and S. Ober-Blöbaum, “Cayley Commutator-free
Methods for Krotov-Type Algorithms in Quantum Optimal Control,” presented at the
European Control Conference, Reykjavík, Iceland, 2026, doi: 10.48550/ARXIV.2603.11697.'
mla: Wembe Moafo, Boris Edgar, et al. Cayley Commutator-Free Methods for Krotov-Type
Algorithms in Quantum Optimal Control. 2026, doi:10.48550/ARXIV.2603.11697.
short: 'B.E. Wembe Moafo, U. Ali, T. Meier, S. Ober-Blöbaum, in: 2026.'
conference:
end_date: 2026-07-10
location: Reykjavík, Iceland
name: European Control Conference
start_date: 2026-07-07
date_created: 2026-06-01T09:38:06Z
date_updated: 2026-06-01T09:40:38Z
department:
- _id: '94'
doi: 10.48550/ARXIV.2603.11697
language:
- iso: eng
status: public
title: Cayley Commutator-free Methods for Krotov-Type Algorithms in Quantum Optimal
Control
type: conference
user_id: '95394'
year: '2026'
...
---
_id: '65702'
author:
- first_name: Heiko
full_name: Meier, Heiko
id: '21765'
last_name: Meier
- first_name: Robert
full_name: Peper, Robert
last_name: Peper
- first_name: Marc
full_name: Kukuk, Marc
id: '290'
last_name: Kukuk
- first_name: Lars
full_name: Riedl, Lars
id: '31513'
last_name: Riedl
citation:
ama: 'Meier H, Peper R, Kukuk M, Riedl L. Netzwerkanalysen als Bestandteil der Partizipativen
Sportentwicklungsplanung. In: Meier H, Kukuk M, Sennefelder L, eds. Planen.
Beteiligen. Bauen. Bewegen. 16. Jahrestagung der dvs-Kommission „Sport und Raum“
vom 19.–20.09.2024 in Bad Driburg & Paderborn. Vol Band 305. Schriften
der Deutschen Vereinigung für Sportwissenschaft. Feldhaus; 2026:107-121.'
apa: 'Meier, H., Peper, R., Kukuk, M., & Riedl, L. (2026). Netzwerkanalysen
als Bestandteil der Partizipativen Sportentwicklungsplanung. In H. Meier, M. Kukuk,
& L. Sennefelder (Eds.), Planen. Beteiligen. Bauen. Bewegen. 16. Jahrestagung
der dvs-Kommission „Sport und Raum“ vom 19.–20.09.2024 in Bad Driburg & Paderborn:
Vol. Band 305 (pp. 107–121). Feldhaus.'
bibtex: '@inbook{Meier_Peper_Kukuk_Riedl_2026, series={Schriften der Deutschen Vereinigung
für Sportwissenschaft}, title={Netzwerkanalysen als Bestandteil der Partizipativen
Sportentwicklungsplanung}, volume={Band 305}, booktitle={Planen. Beteiligen. Bauen.
Bewegen. 16. Jahrestagung der dvs-Kommission „Sport und Raum“ vom 19.–20.09.2024
in Bad Driburg & Paderborn}, publisher={Feldhaus}, author={Meier, Heiko and
Peper, Robert and Kukuk, Marc and Riedl, Lars}, editor={Meier, Heiko and Kukuk,
Marc and Sennefelder, Lisa}, year={2026}, pages={107–121}, collection={Schriften
der Deutschen Vereinigung für Sportwissenschaft} }'
chicago: Meier, Heiko, Robert Peper, Marc Kukuk, and Lars Riedl. “Netzwerkanalysen
als Bestandteil der Partizipativen Sportentwicklungsplanung.” In Planen. Beteiligen.
Bauen. Bewegen. 16. Jahrestagung der dvs-Kommission „Sport und Raum“ vom 19.–20.09.2024
in Bad Driburg & Paderborn, edited by Heiko Meier, Marc Kukuk, and Lisa
Sennefelder, Band 305:107–21. Schriften der Deutschen Vereinigung für Sportwissenschaft.
Feldhaus, 2026.
ieee: H. Meier, R. Peper, M. Kukuk, and L. Riedl, “Netzwerkanalysen als Bestandteil
der Partizipativen Sportentwicklungsplanung,” in Planen. Beteiligen. Bauen.
Bewegen. 16. Jahrestagung der dvs-Kommission „Sport und Raum“ vom 19.–20.09.2024
in Bad Driburg & Paderborn, vol. Band 305, H. Meier, M. Kukuk, and L.
Sennefelder, Eds. Feldhaus, 2026, pp. 107–121.
mla: Meier, Heiko, et al. “Netzwerkanalysen als Bestandteil der Partizipativen Sportentwicklungsplanung.”
Planen. Beteiligen. Bauen. Bewegen. 16. Jahrestagung der dvs-Kommission „Sport
und Raum“ vom 19.–20.09.2024 in Bad Driburg & Paderborn, edited by Heiko
Meier et al., vol. Band 305, Feldhaus, 2026, pp. 107–21.
short: 'H. Meier, R. Peper, M. Kukuk, L. Riedl, in: H. Meier, M. Kukuk, L. Sennefelder
(Eds.), Planen. Beteiligen. Bauen. Bewegen. 16. Jahrestagung der dvs-Kommission
„Sport und Raum“ vom 19.–20.09.2024 in Bad Driburg & Paderborn, Feldhaus,
2026, pp. 107–121.'
date_created: 2026-05-27T14:32:38Z
date_updated: 2026-06-01T08:43:47Z
department:
- _id: '175'
editor:
- first_name: Heiko
full_name: Meier, Heiko
last_name: Meier
- first_name: Marc
full_name: Kukuk, Marc
last_name: Kukuk
- first_name: Lisa
full_name: Sennefelder, Lisa
last_name: Sennefelder
language:
- iso: ger
page: 107-121
publication: Planen. Beteiligen. Bauen. Bewegen. 16. Jahrestagung der dvs-Kommission
„Sport und Raum“ vom 19.–20.09.2024 in Bad Driburg & Paderborn
publication_identifier:
unknown:
- '9783880207301'
publication_status: published
publisher: Feldhaus
series_title: Schriften der Deutschen Vereinigung für Sportwissenschaft
status: public
title: Netzwerkanalysen als Bestandteil der Partizipativen Sportentwicklungsplanung
type: book_chapter
user_id: '290'
volume: Band 305
year: '2026'
...
---
_id: '65744'
abstract:
- lang: eng
text: 'Optimal control problems with symmetries often admit a non stationary turnpike
property called trim turnpike, which characterizes the convergence of optimal
solutions to certain symmetry induced trajectories called trim primitives. In
this paper we establish an exponential trim turnpike property for a class of optimal
control problems with structural properties related to Abelian Lie group symmetries.
The key ingredient of our approach is the introduction of an appropriate reduced
optimal control problem. We show that extremals of the original problem can be
characterized through a reduced Hamiltonian boundary value problem that coincides
with the optimality system of the reduced problem. Under a hyperbolicity assumption
on the equilibrium of the corresponding reduced Hamiltonian system we prove that
optimal trajectories remain exponentially close, up to boundary layers near the
endpoints, to a trim primitive defined by the static reduced problem. The theoretical
results are illustrated on three representative examples: linear and nonlinear
problems with quadratic cost and the Kepler orbital transfer problem.'
author:
- 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: Boris Edgar
full_name: Wembe Moafo, Boris Edgar
id: '95394'
last_name: Wembe Moafo
orcid: 0000-0002-6085-8071
citation:
ama: Maslovskaya S, Ober-Blöbaum S, Wembe Moafo BE. Non static exponential turnpike
property for optimal control problems with symmetries and boundary conditions.
apa: Maslovskaya, S., Ober-Blöbaum, S., & Wembe Moafo, B. E. (n.d.). Non
static exponential turnpike property for optimal control problems with symmetries
and boundary conditions.
bibtex: '@article{Maslovskaya_Ober-Blöbaum_Wembe Moafo, title={Non static exponential
turnpike property for optimal control problems with symmetries and boundary conditions},
author={Maslovskaya, Sofya and Ober-Blöbaum, Sina and Wembe Moafo, Boris Edgar}
}'
chicago: Maslovskaya, Sofya, Sina Ober-Blöbaum, and Boris Edgar Wembe Moafo. “Non
Static Exponential Turnpike Property for Optimal Control Problems with Symmetries
and Boundary Conditions,” n.d.
ieee: S. Maslovskaya, S. Ober-Blöbaum, and B. E. Wembe Moafo, “Non static exponential
turnpike property for optimal control problems with symmetries and boundary conditions.”
.
mla: Maslovskaya, Sofya, et al. Non Static Exponential Turnpike Property for
Optimal Control Problems with Symmetries and Boundary Conditions.
short: S. Maslovskaya, S. Ober-Blöbaum, B.E. Wembe Moafo, (n.d.).
date_created: 2026-06-01T09:31:15Z
date_updated: 2026-06-01T09:35:13Z
department:
- _id: '94'
language:
- iso: eng
publication_status: submitted
status: public
title: Non static exponential turnpike property for optimal control problems with
symmetries and boundary conditions
type: preprint
user_id: '95394'
year: '2026'
...
---
_id: '65747'
abstract:
- lang: eng
text: 'In this work, we address the numerical identification of entanglement in
dynamical scenarios. To this end, we consider different programs based on the
restriction of the evolution to the set of separable (i.e., non-entangled) states,
together with the discretization of the space of variables for numerical computations.
As a first approach, we apply linear splitting methods to the restricted, continuous
equations of motion derived from variational principles. We utilize an exchange
interaction Hamiltonian to confirm that the numerical and analytical solutions
coincide in the limit of small time steps. The application to different Hamiltonians
shows the wide applicability of the method to detect dynamical entanglement. To
avoid the derivation of analytical solutions for complex dynamics, we consider
variational, numerical integration schemes, introducing a variational discretization
for Lagrangians linear in velocities. Here, we examine and compare two approaches:
one in which the system is discretized before the restriction is applied, and
another in which the restriction precedes the discretization. We find that the
"first-discretize-then-restrict" method becomes numerically unstable, already
for the example of an exchange-interaction Hamiltonian, which can be an important
consideration for the numerical analysis of constrained quantum dynamics. Thereby,
broadly applicable numerical tools, including their limitations, for studying
entanglement over time are established for assessing the entangling power of processes
that are used in quantum information theory.'
article_type: original
author:
- first_name: Christian
full_name: Offen, Christian
last_name: Offen
- first_name: Boris
full_name: Wembe, Boris
last_name: Wembe
- first_name: Laura
full_name: Ares, Laura
last_name: Ares
- first_name: Jan
full_name: Sperling, Jan
last_name: Sperling
- first_name: Sina
full_name: Ober-Blöbaum, Sina
last_name: Ober-Blöbaum
citation:
ama: 'Offen C, Wembe B, Ares L, Sperling J, Ober-Blöbaum S. Numerical approaches
to entangling dynamics from variational principles. Journal of Physics A: Mathematical
and Theoretical. Published online 2026. doi:10.1088/1751-8121/ae6d51'
apa: 'Offen, C., Wembe, B., Ares, L., Sperling, J., & Ober-Blöbaum, S. (2026).
Numerical approaches to entangling dynamics from variational principles. Journal
of Physics A: Mathematical and Theoretical. https://doi.org/10.1088/1751-8121/ae6d51'
bibtex: '@article{Offen_Wembe_Ares_Sperling_Ober-Blöbaum_2026, title={Numerical
approaches to entangling dynamics from variational principles}, DOI={10.1088/1751-8121/ae6d51},
journal={Journal of Physics A: Mathematical and Theoretical}, publisher={IOP Publishing},
author={Offen, Christian and Wembe, Boris and Ares, Laura and Sperling, Jan and
Ober-Blöbaum, Sina}, year={2026} }'
chicago: 'Offen, Christian, Boris Wembe, Laura Ares, Jan Sperling, and Sina Ober-Blöbaum.
“Numerical Approaches to Entangling Dynamics from Variational Principles.” Journal
of Physics A: Mathematical and Theoretical, 2026. https://doi.org/10.1088/1751-8121/ae6d51.'
ieee: 'C. Offen, B. Wembe, L. Ares, J. Sperling, and S. Ober-Blöbaum, “Numerical
approaches to entangling dynamics from variational principles,” Journal of
Physics A: Mathematical and Theoretical, 2026, doi: 10.1088/1751-8121/ae6d51.'
mla: 'Offen, Christian, et al. “Numerical Approaches to Entangling Dynamics from
Variational Principles.” Journal of Physics A: Mathematical and Theoretical,
IOP Publishing, 2026, doi:10.1088/1751-8121/ae6d51.'
short: 'C. Offen, B. Wembe, L. Ares, J. Sperling, S. Ober-Blöbaum, Journal of Physics
A: Mathematical and Theoretical (2026).'
date_created: 2026-06-01T09:41:19Z
date_updated: 2026-06-01T09:43:52Z
department:
- _id: '94'
doi: 10.1088/1751-8121/ae6d51
language:
- iso: eng
publication: 'Journal of Physics A: Mathematical and Theoretical'
publication_identifier:
issn:
- 1751-8113
- 1751-8121
publication_status: published
publisher: IOP Publishing
status: public
title: Numerical approaches to entangling dynamics from variational principles
type: journal_article
user_id: '95394'
year: '2026'
...
---
_id: '65740'
author:
- first_name: FRank Thomas
full_name: Brinkmann, FRank Thomas
last_name: Brinkmann
- first_name: Christoph
full_name: Jacke, Christoph
id: '20747'
last_name: Jacke
citation:
ama: 'Brinkmann FrT, Jacke C. Don’t touch me there/Touch my body. Zur Vielstimmigkeit
und Unstimmigkeit besungener (Be-)Rührungswünsche. In: Polke C, Seipel M-L,
Stahl M, eds. beRÜHRUNGen. Leibliches, seelisches und existentielles Geschehen
in der Popkultur. 1st ed. Springer Fachmedien Wiesbaden; 2026:45-77. doi:10.1007/978-3-658-49796-5'
apa: Brinkmann, Fr. T., & Jacke, C. (2026). Don’t touch me there/Touch my body.
Zur Vielstimmigkeit und Unstimmigkeit besungener (Be-)Rührungswünsche. In C.
Polke, M.-L. Seipel, & M. Stahl (Eds.), beRÜHRUNGen. Leibliches, seelisches
und existentielles Geschehen in der Popkultur (1st ed., pp. 45–77). Springer
Fachmedien Wiesbaden. https://doi.org/10.1007/978-3-658-49796-5
bibtex: '@inbook{Brinkmann_Jacke_2026, place={Wiesbaden}, edition={1}, title={Don’t
touch me there/Touch my body. Zur Vielstimmigkeit und Unstimmigkeit besungener
(Be-)Rührungswünsche}, DOI={10.1007/978-3-658-49796-5},
booktitle={beRÜHRUNGen. Leibliches, seelisches und existentielles Geschehen in
der Popkultur}, publisher={Springer Fachmedien Wiesbaden}, author={Brinkmann,
FRank Thomas and Jacke, Christoph}, editor={Polke, Christian and Seipel, Maria-Louise
and Stahl, Mirjam}, year={2026}, pages={45–77} }'
chicago: 'Brinkmann, FRank Thomas, and Christoph Jacke. “Don’t touch me there/Touch
my body. Zur Vielstimmigkeit und Unstimmigkeit besungener (Be-)Rührungswünsche.”
In beRÜHRUNGen. Leibliches, seelisches und existentielles Geschehen in der
Popkultur, edited by Christian Polke, Maria-Louise Seipel, and Mirjam Stahl,
1st ed., 45–77. Wiesbaden: Springer Fachmedien Wiesbaden, 2026. https://doi.org/10.1007/978-3-658-49796-5.'
ieee: 'Fr. T. Brinkmann and C. Jacke, “Don’t touch me there/Touch my body. Zur Vielstimmigkeit
und Unstimmigkeit besungener (Be-)Rührungswünsche,” in beRÜHRUNGen. Leibliches,
seelisches und existentielles Geschehen in der Popkultur, 1st ed., C. Polke,
M.-L. Seipel, and M. Stahl, Eds. Wiesbaden: Springer Fachmedien Wiesbaden, 2026,
pp. 45–77.'
mla: Brinkmann, FRank Thomas, and Christoph Jacke. “Don’t touch me there/Touch my
body. Zur Vielstimmigkeit und Unstimmigkeit besungener (Be-)Rührungswünsche.”
beRÜHRUNGen. Leibliches, seelisches und existentielles Geschehen in der Popkultur,
edited by Christian Polke et al., 1st ed., Springer Fachmedien Wiesbaden, 2026,
pp. 45–77, doi:10.1007/978-3-658-49796-5.
short: 'Fr.T. Brinkmann, C. Jacke, in: C. Polke, M.-L. Seipel, M. Stahl (Eds.),
beRÜHRUNGen. Leibliches, seelisches und existentielles Geschehen in der Popkultur,
1st ed., Springer Fachmedien Wiesbaden, Wiesbaden, 2026, pp. 45–77.'
date_created: 2026-06-01T08:42:47Z
date_updated: 2026-06-01T10:58:48Z
department:
- _id: '607'
- _id: '817'
doi: 10.1007/978-3-658-49796-5
edition: '1'
editor:
- first_name: Christian
full_name: Polke, Christian
last_name: Polke
- first_name: Maria-Louise
full_name: Seipel, Maria-Louise
last_name: Seipel
- first_name: Mirjam
full_name: Stahl, Mirjam
last_name: Stahl
language:
- iso: ger
page: 45-77
place: Wiesbaden
publication: beRÜHRUNGen. Leibliches, seelisches und existentielles Geschehen in der
Popkultur
publication_identifier:
isbn:
- '9783658497958'
- '9783658497965'
issn:
- 2569-880X
- 2569-8818
publication_status: published
publisher: Springer Fachmedien Wiesbaden
status: public
title: Don’t touch me there/Touch my body. Zur Vielstimmigkeit und Unstimmigkeit besungener
(Be-)Rührungswünsche
type: book_chapter
user_id: '20747'
year: '2026'
...
---
_id: '65139'
author:
- first_name: Wael
full_name: Jabr, Wael
last_name: Jabr
- first_name: Dominik
full_name: Gutt, Dominik
last_name: Gutt
- first_name: Jürgen
full_name: Neumann, Jürgen
last_name: Neumann
- first_name: Dennis
full_name: Kundisch, Dennis
last_name: Kundisch
citation:
ama: Jabr W, Gutt D, Neumann J, Kundisch D. Updating at the Expense of Demand? The
Case of Platform Apps. Information Systems and e-Business Management. Published
online 2026. doi:10.1007/s1025-026-00723-y
apa: Jabr, W., Gutt, D., Neumann, J., & Kundisch, D. (2026). Updating at the
Expense of Demand? The Case of Platform Apps. Information Systems and E-Business
Management. https://doi.org/10.1007/s1025-026-00723-y
bibtex: '@article{Jabr_Gutt_Neumann_Kundisch_2026, title={Updating at the Expense
of Demand? The Case of Platform Apps}, DOI={10.1007/s1025-026-00723-y},
journal={Information Systems and e-Business Management}, publisher={Springer},
author={Jabr, Wael and Gutt, Dominik and Neumann, Jürgen and Kundisch, Dennis},
year={2026} }'
chicago: Jabr, Wael, Dominik Gutt, Jürgen Neumann, and Dennis Kundisch. “Updating
at the Expense of Demand? The Case of Platform Apps.” Information Systems and
E-Business Management, 2026. https://doi.org/10.1007/s1025-026-00723-y.
ieee: 'W. Jabr, D. Gutt, J. Neumann, and D. Kundisch, “Updating at the Expense of
Demand? The Case of Platform Apps,” Information Systems and e-Business Management,
2026, doi: 10.1007/s1025-026-00723-y.'
mla: Jabr, Wael, et al. “Updating at the Expense of Demand? The Case of Platform
Apps.” Information Systems and E-Business Management, Springer, 2026, doi:10.1007/s1025-026-00723-y.
short: W. Jabr, D. Gutt, J. Neumann, D. Kundisch, Information Systems and E-Business
Management (2026).
date_created: 2026-03-26T10:59:29Z
date_updated: 2026-06-01T13:24:22Z
department:
- _id: '276'
doi: 10.1007/s1025-026-00723-y
language:
- iso: eng
publication: Information Systems and e-Business Management
publication_status: published
publisher: Springer
related_material:
link:
- relation: confirmation
url: https://link.springer.com/article/10.1007/s10257-026-00723-y?utm_source=rct_congratemailt&utm_medium=email&utm_campaign=oa_20260531&utm_content=10.1007/s10257-026-00723-y
status: public
title: Updating at the Expense of Demand? The Case of Platform Apps
type: journal_article
user_id: '16205'
year: '2026'
...
---
_id: '65451'
author:
- first_name: Christoph
full_name: Ksouri-Gerwien, Christoph
last_name: Ksouri-Gerwien
- first_name: Christian
full_name: Vorbohle, Christian
id: '29951'
last_name: Vorbohle
citation:
ama: 'Ksouri-Gerwien C, Vorbohle C. Business Model Prototyping and Evaluation from
an Ecosystem Perspective: An Actor-based Modeling Framework for Using System Dynamics.
Information Systems and e-Business Management. Published online 2026.'
apa: 'Ksouri-Gerwien, C., & Vorbohle, C. (2026). Business Model Prototyping
and Evaluation from an Ecosystem Perspective: An Actor-based Modeling Framework
for Using System Dynamics. Information Systems and E-Business Management.'
bibtex: '@article{Ksouri-Gerwien_Vorbohle_2026, title={Business Model Prototyping
and Evaluation from an Ecosystem Perspective: An Actor-based Modeling Framework
for Using System Dynamics}, journal={Information Systems and e-Business Management},
author={Ksouri-Gerwien, Christoph and Vorbohle, Christian}, year={2026} }'
chicago: 'Ksouri-Gerwien, Christoph, and Christian Vorbohle. “Business Model Prototyping
and Evaluation from an Ecosystem Perspective: An Actor-Based Modeling Framework
for Using System Dynamics.” Information Systems and E-Business Management,
2026.'
ieee: 'C. Ksouri-Gerwien and C. Vorbohle, “Business Model Prototyping and Evaluation
from an Ecosystem Perspective: An Actor-based Modeling Framework for Using System
Dynamics,” Information Systems and e-Business Management, 2026.'
mla: 'Ksouri-Gerwien, Christoph, and Christian Vorbohle. “Business Model Prototyping
and Evaluation from an Ecosystem Perspective: An Actor-Based Modeling Framework
for Using System Dynamics.” Information Systems and E-Business Management,
2026.'
short: C. Ksouri-Gerwien, C. Vorbohle, Information Systems and E-Business Management
(2026).
date_created: 2026-04-15T13:13:12Z
date_updated: 2026-06-01T13:21:39Z
department:
- _id: '276'
language:
- iso: eng
publication: Information Systems and e-Business Management
publication_status: published
status: public
title: 'Business Model Prototyping and Evaluation from an Ecosystem Perspective: An
Actor-based Modeling Framework for Using System Dynamics'
type: journal_article
user_id: '16205'
year: '2026'
...
---
_id: '65749'
abstract:
- lang: eng
text: "Abstract\r\n Phase noise
is one of the most important properties of oscillators that limit the capacity
of high-frequency communication systems. In heterodyne conversion schemes, the
phase noise of the local oscillator will be multiplied and up-converted to the
transmission channel. Therefore, accurate characterization of the oscillators
is highly important for the design of THz communication systems. Especially when
it comes to the characterization of high-quality oscillators with extremely low
phase noise, traceable measurement methods are not available.\r\n In
this chapter, the mathematical model and definition of the amplitude noise (AM
noise) and phase noise (PM noise) are given. Different phase noise definition
standards such as single sideband (SSB) and double sideband will also be provided.
Phase noise measurement techniques such as frequency discrimination and phase-locked
loop (PLL) technique will be discussed. The standard two-channel cross correlation
for statistical analysis of phase noise at levels below the detection limit of
the phase noise receiver will be explained with mathematical formalism."
author:
- first_name: Meysam
full_name: Bahmanian, Meysam
id: '69233'
last_name: Bahmanian
- first_name: J. Christoph
full_name: Scheytt, J. Christoph
id: '37144'
last_name: Scheytt
orcid: '0000-0002-5950-6618 '
- first_name: Nora
full_name: Meyne, Nora
last_name: Meyne
- first_name: Thomas
full_name: Kleine-Ostmann, Thomas
last_name: Kleine-Ostmann
citation:
ama: 'Bahmanian M, Scheytt JC, Meyne N, Kleine-Ostmann T. Phase Noise Metrology.
In: Springer Series in Optical Sciences. Springer Nature Switzerland; 2026.
doi:10.1007/978-3-032-01986-8_4'
apa: Bahmanian, M., Scheytt, J. C., Meyne, N., & Kleine-Ostmann, T. (2026).
Phase Noise Metrology. In Springer Series in Optical Sciences. Springer
Nature Switzerland. https://doi.org/10.1007/978-3-032-01986-8_4
bibtex: '@inbook{Bahmanian_Scheytt_Meyne_Kleine-Ostmann_2026, place={Cham}, title={Phase
Noise Metrology}, DOI={10.1007/978-3-032-01986-8_4},
booktitle={Springer Series in Optical Sciences}, publisher={Springer Nature Switzerland},
author={Bahmanian, Meysam and Scheytt, J. Christoph and Meyne, Nora and Kleine-Ostmann,
Thomas}, year={2026} }'
chicago: 'Bahmanian, Meysam, J. Christoph Scheytt, Nora Meyne, and Thomas Kleine-Ostmann.
“Phase Noise Metrology.” In Springer Series in Optical Sciences. Cham:
Springer Nature Switzerland, 2026. https://doi.org/10.1007/978-3-032-01986-8_4.'
ieee: 'M. Bahmanian, J. C. Scheytt, N. Meyne, and T. Kleine-Ostmann, “Phase Noise
Metrology,” in Springer Series in Optical Sciences, Cham: Springer Nature
Switzerland, 2026.'
mla: Bahmanian, Meysam, et al. “Phase Noise Metrology.” Springer Series in Optical
Sciences, Springer Nature Switzerland, 2026, doi:10.1007/978-3-032-01986-8_4.
short: 'M. Bahmanian, J.C. Scheytt, N. Meyne, T. Kleine-Ostmann, in: Springer Series
in Optical Sciences, Springer Nature Switzerland, Cham, 2026.'
conference:
end_date: 2026-05-01
start_date: 2026-05-01
date_created: 2026-06-01T12:17:34Z
date_updated: 2026-06-02T09:34:24Z
department:
- _id: '58'
- _id: '623'
doi: 10.1007/978-3-032-01986-8_4
language:
- iso: eng
place: Cham
publication: Springer Series in Optical Sciences
publication_identifier:
isbn:
- '9783032019851'
- '9783032019868'
issn:
- 0342-4111
- 1556-1534
publication_status: published
publisher: Springer Nature Switzerland
status: public
title: Phase Noise Metrology
type: book_chapter
user_id: '13256'
year: '2026'
...
---
_id: '65754'
abstract:
- lang: eng
text: "ABSTRACT\r\n \r\n The
integration of heat pumps offers a promising route for electrifying chemical processes
and reducing CO\r\n 2\r\n emissions.
Their feasibility strongly depends on the temperature levels and the quantities
of available heat sources and sinks, which can be influenced by adjusting process
operating parameters to enhance integration potential. The number and quality
of these sources and sinks also determine suitable heat pump configurations and
therefore the technical and economic viability of implementation. In addition,
refrigerant selection is a critical factor, as it is restricted by regulations
such as the F‐Gas Regulation. This study investigates how different operating
parameters affect the integration potential of various heat pump configurations
in a CO\r\n 2\r\n absorption
process using MEA as solvent. Furthermore, economic evaluations are carried out
considering different electricity price scenarios and allowable refrigerants.\r\n
\ "
article_number: e70131
author:
- first_name: Johannes
full_name: Wloch, Johannes
last_name: Wloch
- first_name: Marcus
full_name: Grünewald, Marcus
last_name: Grünewald
- first_name: Julia
full_name: Riese, Julia
id: '101499'
last_name: Riese
orcid: 0000-0002-3053-0534
citation:
ama: Wloch J, Grünewald M, Riese J. Matching Heat Pump Configurations and Process
Parameters for Cost‐Minimal Heat‐Integrated CO2-Capturing Process.
Chemie Ingenieur Technik. Published online 2026. doi:10.1002/cite.70131
apa: Wloch, J., Grünewald, M., & Riese, J. (2026). Matching Heat Pump Configurations
and Process Parameters for Cost‐Minimal Heat‐Integrated CO2-Capturing
Process. Chemie Ingenieur Technik, Article e70131. https://doi.org/10.1002/cite.70131
bibtex: '@article{Wloch_Grünewald_Riese_2026, title={Matching Heat Pump Configurations
and Process Parameters for Cost‐Minimal Heat‐Integrated CO2-Capturing
Process}, DOI={10.1002/cite.70131},
number={e70131}, journal={Chemie Ingenieur Technik}, publisher={Wiley}, author={Wloch,
Johannes and Grünewald, Marcus and Riese, Julia}, year={2026} }'
chicago: Wloch, Johannes, Marcus Grünewald, and Julia Riese. “Matching Heat Pump
Configurations and Process Parameters for Cost‐Minimal Heat‐Integrated CO2-Capturing
Process.” Chemie Ingenieur Technik, 2026. https://doi.org/10.1002/cite.70131.
ieee: 'J. Wloch, M. Grünewald, and J. Riese, “Matching Heat Pump Configurations
and Process Parameters for Cost‐Minimal Heat‐Integrated CO2-Capturing
Process,” Chemie Ingenieur Technik, Art. no. e70131, 2026, doi: 10.1002/cite.70131.'
mla: Wloch, Johannes, et al. “Matching Heat Pump Configurations and Process Parameters
for Cost‐Minimal Heat‐Integrated CO2-Capturing Process.” Chemie
Ingenieur Technik, e70131, Wiley, 2026, doi:10.1002/cite.70131.
short: J. Wloch, M. Grünewald, J. Riese, Chemie Ingenieur Technik (2026).
date_created: 2026-06-02T09:59:46Z
date_updated: 2026-06-02T10:03:57Z
department:
- _id: '831'
doi: 10.1002/cite.70131
language:
- iso: eng
publication: Chemie Ingenieur Technik
publication_identifier:
issn:
- 0009-286X
- 1522-2640
publication_status: published
publisher: Wiley
quality_controlled: '1'
status: public
title: Matching Heat Pump Configurations and Process Parameters for Cost‐Minimal Heat‐Integrated
CO2-Capturing Process
type: journal_article
user_id: '101499'
year: '2026'
...
---
_id: '65748'
abstract:
- lang: eng
text: "Abstract\r\n In this chapter,
the precision of optical clocks based on mode-locked laser (MLL) is compared with
more conventional types of clock sources. It is shown that the phase noise of
the optical pulse train from the MLL can be better than other types of clock sources
by orders of magnitude. Then, an abstract representation of frequency synthesizer
is demonstrated. Different techniques for RF generation using MLL are shown, and
their pros and cons are discussed. Finally, a comparison of all these techniques
is made with respect to their phase noise and capability to generate RF signal
with different frequencies for different applications."
author:
- first_name: Meysam
full_name: Bahmanian, Meysam
id: '69233'
last_name: Bahmanian
- first_name: J. Christoph
full_name: Scheytt, J. Christoph
id: '37144'
last_name: Scheytt
orcid: '0000-0002-5950-6618 '
citation:
ama: 'Bahmanian M, Scheytt JC. Frequency Synthesis Based on MLLs. In: Springer
Series in Optical Sciences. Springer Nature Switzerland; 2026. doi:10.1007/978-3-032-01986-8_28'
apa: Bahmanian, M., & Scheytt, J. C. (2026). Frequency Synthesis Based on MLLs.
In Springer Series in Optical Sciences. Springer Nature Switzerland. https://doi.org/10.1007/978-3-032-01986-8_28
bibtex: '@inbook{Bahmanian_Scheytt_2026, place={Cham}, title={Frequency Synthesis
Based on MLLs}, DOI={10.1007/978-3-032-01986-8_28},
booktitle={Springer Series in Optical Sciences}, publisher={Springer Nature Switzerland},
author={Bahmanian, Meysam and Scheytt, J. Christoph}, year={2026} }'
chicago: 'Bahmanian, Meysam, and J. Christoph Scheytt. “Frequency Synthesis Based
on MLLs.” In Springer Series in Optical Sciences. Cham: Springer Nature
Switzerland, 2026. https://doi.org/10.1007/978-3-032-01986-8_28.'
ieee: 'M. Bahmanian and J. C. Scheytt, “Frequency Synthesis Based on MLLs,” in Springer
Series in Optical Sciences, Cham: Springer Nature Switzerland, 2026.'
mla: Bahmanian, Meysam, and J. Christoph Scheytt. “Frequency Synthesis Based on
MLLs.” Springer Series in Optical Sciences, Springer Nature Switzerland,
2026, doi:10.1007/978-3-032-01986-8_28.
short: 'M. Bahmanian, J.C. Scheytt, in: Springer Series in Optical Sciences, Springer
Nature Switzerland, Cham, 2026.'
conference:
end_date: 2026-05-01
start_date: 2026-05-01
date_created: 2026-06-01T12:16:46Z
date_updated: 2026-06-02T09:34:54Z
department:
- _id: '58'
- _id: '623'
doi: 10.1007/978-3-032-01986-8_28
language:
- iso: eng
place: Cham
publication: Springer Series in Optical Sciences
publication_identifier:
isbn:
- '9783032019851'
- '9783032019868'
issn:
- 0342-4111
- 1556-1534
publication_status: published
publisher: Springer Nature Switzerland
status: public
title: Frequency Synthesis Based on MLLs
type: book_chapter
user_id: '13256'
year: '2026'
...
---
_id: '65755'
author:
- first_name: Jan Luca
full_name: Twardzik, Jan Luca
last_name: Twardzik
- first_name: Lynn
full_name: Humpert, Lynn
last_name: Humpert
- first_name: Gerrit
full_name: Cichon, Gerrit
last_name: Cichon
- first_name: Roman
full_name: Dumitrescu, Roman
id: '16190'
last_name: Dumitrescu
citation:
ama: 'Twardzik JL, Humpert L, Cichon G, Dumitrescu R. Knowledge Gaps in Circular
Product Development: A Systematic Literature Review of the Manufacturing Industry.
In: Lecture Notes in Mechanical Engineering. Springer Nature Switzerland;
2026. doi:10.1007/978-3-032-21157-6_39'
apa: 'Twardzik, J. L., Humpert, L., Cichon, G., & Dumitrescu, R. (2026). Knowledge
Gaps in Circular Product Development: A Systematic Literature Review of the Manufacturing
Industry. In Lecture Notes in Mechanical Engineering. Springer Nature Switzerland.
https://doi.org/10.1007/978-3-032-21157-6_39'
bibtex: '@inbook{Twardzik_Humpert_Cichon_Dumitrescu_2026, place={Cham}, title={Knowledge
Gaps in Circular Product Development: A Systematic Literature Review of the Manufacturing
Industry}, DOI={10.1007/978-3-032-21157-6_39},
booktitle={Lecture Notes in Mechanical Engineering}, publisher={Springer Nature
Switzerland}, author={Twardzik, Jan Luca and Humpert, Lynn and Cichon, Gerrit
and Dumitrescu, Roman}, year={2026} }'
chicago: 'Twardzik, Jan Luca, Lynn Humpert, Gerrit Cichon, and Roman Dumitrescu.
“Knowledge Gaps in Circular Product Development: A Systematic Literature Review
of the Manufacturing Industry.” In Lecture Notes in Mechanical Engineering.
Cham: Springer Nature Switzerland, 2026. https://doi.org/10.1007/978-3-032-21157-6_39.'
ieee: 'J. L. Twardzik, L. Humpert, G. Cichon, and R. Dumitrescu, “Knowledge Gaps
in Circular Product Development: A Systematic Literature Review of the Manufacturing
Industry,” in Lecture Notes in Mechanical Engineering, Cham: Springer Nature
Switzerland, 2026.'
mla: 'Twardzik, Jan Luca, et al. “Knowledge Gaps in Circular Product Development:
A Systematic Literature Review of the Manufacturing Industry.” Lecture Notes
in Mechanical Engineering, Springer Nature Switzerland, 2026, doi:10.1007/978-3-032-21157-6_39.'
short: 'J.L. Twardzik, L. Humpert, G. Cichon, R. Dumitrescu, in: Lecture Notes in
Mechanical Engineering, Springer Nature Switzerland, Cham, 2026.'
date_created: 2026-06-02T11:46:11Z
date_updated: 2026-06-02T11:50:46Z
department:
- _id: '563'
doi: 10.1007/978-3-032-21157-6_39
language:
- iso: eng
place: Cham
publication: Lecture Notes in Mechanical Engineering
publication_identifier:
isbn:
- '9783032211569'
- '9783032211576'
issn:
- 2195-4356
- 2195-4364
publication_status: published
publisher: Springer Nature Switzerland
status: public
title: 'Knowledge Gaps in Circular Product Development: A Systematic Literature Review
of the Manufacturing Industry'
type: book_chapter
user_id: '15782'
year: '2026'
...
---
_id: '63615'
author:
- first_name: Johannes
full_name: Meyer-Hamme, Johannes
id: '49623'
last_name: Meyer-Hamme
- first_name: Olaf
full_name: Hartung, Olaf
id: '79451'
last_name: Hartung
orcid: 0009-0007-8673-250X
citation:
ama: 'Meyer-Hamme J, Hartung O. Historisches Lernen. In: Barricelli M, Lücke M,
eds. Handbuch Praxis des Geschichtsunterrichts. 2nd ed. Wochenschau Verlag;
2026.'
apa: Meyer-Hamme, J., & Hartung, O. (2026). Historisches Lernen. In M. Barricelli
& M. Lücke (Eds.), Handbuch Praxis des Geschichtsunterrichts (2nd ed.).
Wochenschau Verlag.
bibtex: '@inbook{Meyer-Hamme_Hartung_2026, place={Frankfurt/Main}, edition={2},
title={Historisches Lernen}, booktitle={Handbuch Praxis des Geschichtsunterrichts},
publisher={Wochenschau Verlag}, author={Meyer-Hamme, Johannes and Hartung, Olaf},
editor={Barricelli, Michele and Lücke, Martin}, year={2026} }'
chicago: 'Meyer-Hamme, Johannes, and Olaf Hartung. “Historisches Lernen.” In Handbuch
Praxis des Geschichtsunterrichts, edited by Michele Barricelli and Martin
Lücke, 2nd ed. Frankfurt/Main: Wochenschau Verlag, 2026.'
ieee: 'J. Meyer-Hamme and O. Hartung, “Historisches Lernen,” in Handbuch Praxis
des Geschichtsunterrichts, 2nd ed., M. Barricelli and M. Lücke, Eds. Frankfurt/Main:
Wochenschau Verlag, 2026.'
mla: Meyer-Hamme, Johannes, and Olaf Hartung. “Historisches Lernen.” Handbuch
Praxis des Geschichtsunterrichts, edited by Michele Barricelli and Martin
Lücke, 2nd ed., Wochenschau Verlag, 2026.
short: 'J. Meyer-Hamme, O. Hartung, in: M. Barricelli, M. Lücke (Eds.), Handbuch
Praxis des Geschichtsunterrichts, 2nd ed., Wochenschau Verlag, Frankfurt/Main,
2026.'
date_created: 2026-01-15T08:35:25Z
date_updated: 2026-06-02T10:34:52Z
department:
- _id: '6'
- _id: '444'
edition: '2'
editor:
- first_name: Michele
full_name: Barricelli, Michele
last_name: Barricelli
- first_name: Martin
full_name: Lücke, Martin
last_name: Lücke
language:
- iso: ger
place: Frankfurt/Main
publication: Handbuch Praxis des Geschichtsunterrichts
publication_identifier:
isbn:
- 978-3-7344-1775-7
issn:
- 1435-7658
publication_status: published
publisher: Wochenschau Verlag
quality_controlled: '1'
status: public
title: Historisches Lernen
type: book_chapter
user_id: '79451'
year: '2026'
...
---
_id: '65753'
author:
- first_name: Max
full_name: Schenke, Max
last_name: Schenke
- first_name: Barnabas
full_name: Haucke-Korber, Barnabas
last_name: Haucke-Korber
- first_name: Oliver
full_name: Wallscheid, Oliver
last_name: Wallscheid
citation:
ama: Schenke M, Haucke-Korber B, Wallscheid O. Safe Reinforcement Learning Direct
Torque Control for Continuous Control Set Permanent Magnet Synchronous Motor Drives.
IEEE Access. Published online 2026:1-1. doi:10.1109/access.2026.3696042
apa: Schenke, M., Haucke-Korber, B., & Wallscheid, O. (2026). Safe Reinforcement
Learning Direct Torque Control for Continuous Control Set Permanent Magnet Synchronous
Motor Drives. IEEE Access, 1–1. https://doi.org/10.1109/access.2026.3696042
bibtex: '@article{Schenke_Haucke-Korber_Wallscheid_2026, title={Safe Reinforcement
Learning Direct Torque Control for Continuous Control Set Permanent Magnet Synchronous
Motor Drives}, DOI={10.1109/access.2026.3696042},
journal={IEEE Access}, publisher={Institute of Electrical and Electronics Engineers
(IEEE)}, author={Schenke, Max and Haucke-Korber, Barnabas and Wallscheid, Oliver},
year={2026}, pages={1–1} }'
chicago: Schenke, Max, Barnabas Haucke-Korber, and Oliver Wallscheid. “Safe Reinforcement
Learning Direct Torque Control for Continuous Control Set Permanent Magnet Synchronous
Motor Drives.” IEEE Access, 2026, 1–1. https://doi.org/10.1109/access.2026.3696042.
ieee: 'M. Schenke, B. Haucke-Korber, and O. Wallscheid, “Safe Reinforcement Learning
Direct Torque Control for Continuous Control Set Permanent Magnet Synchronous
Motor Drives,” IEEE Access, pp. 1–1, 2026, doi: 10.1109/access.2026.3696042.'
mla: Schenke, Max, et al. “Safe Reinforcement Learning Direct Torque Control for
Continuous Control Set Permanent Magnet Synchronous Motor Drives.” IEEE Access,
Institute of Electrical and Electronics Engineers (IEEE), 2026, pp. 1–1, doi:10.1109/access.2026.3696042.
short: M. Schenke, B. Haucke-Korber, O. Wallscheid, IEEE Access (2026) 1–1.
date_created: 2026-06-02T07:29:20Z
date_updated: 2026-06-02T07:33:21Z
doi: 10.1109/access.2026.3696042
page: 1-1
publication: IEEE Access
publication_identifier:
issn:
- 2169-3536
publication_status: published
publisher: Institute of Electrical and Electronics Engineers (IEEE)
status: public
title: Safe Reinforcement Learning Direct Torque Control for Continuous Control Set
Permanent Magnet Synchronous Motor Drives
type: journal_article
user_id: '93461'
year: '2026'
...