---
_id: '65670'
abstract:
- lang: eng
  text: "Ensuring the veracity of assertions is {vital for building reliable and consistent
    knowledge graphs}. \r\nA variety of automatic fact-checking approaches have been
    proposed over the past decade. Among these, path-based fact-checking approaches
    are particularly attractive due to their independence of supplementary external
    knowledge and their faster runtimes compared to methods reliant on external corpora
    or embeddings.  \r\nHowever, the effectiveness of these approaches is fundamentally
    limited by the incompleteness of existing knowledge graphs, which often lack the
    paths necessary to support or refute assertions. \r\nTo address this limitation,
    we propose \\system{}, a framework that supplements the knowledge graph with shallow
    knowledge---automatically extracted RDF assertions from external unstructured
    sources---even if this additional knowledge may not always fit a well-defined
    ontology nor be fully verified. By appending such shallow knowledge, we enhance
    the graph’s coverage and increase the chances of finding relevant evidence for
    fact checking. Comprehensive experiments on three widely used benchmark datasets
    demonstrate that integrating \\system{} consistently and significantly enhances
    the performance of {state-of-the-art path-based fact-checking approaches}, yielding
    improvements of up to 0.24 in Area Under the Receiver Operating Characteristic
    Curve (AUROC). These results establish \\system{} as a broadly applicable auxiliary
    component for improving the reliability and coverage of automatic fact checking
    in knowledge graphs. Our code is open-source and can be found at \\url{https://github.com/dice-group/ShallKnow}."
author:
- first_name: Umair
  full_name: Qudus, Umair
  id: '83392'
  last_name: Qudus
  orcid: 0000-0001-6714-8729
- first_name: Neha
  full_name: Pokharel, Neha
  last_name: Pokharel
- first_name: Michael
  full_name: Röder, Michael
  id: '67199'
  last_name: Röder
  orcid: https://orcid.org/0000-0002-8609-8277
- first_name: Axel-Cyrille
  full_name: Ngonga Ngomo, Axel-Cyrille
  id: '65716'
  last_name: Ngonga Ngomo
citation:
  ama: 'Qudus U, Pokharel N, Röder M, Ngonga Ngomo A-C. No Need to Be a Know-It-All:
    Fact Checking with Shallow Knowledge. In: <i>Lecture Notes in Computer Science</i>.
    Springer Nature Switzerland; 2026. doi:<a href="https://doi.org/10.1007/978-3-032-25156-5_23">10.1007/978-3-032-25156-5_23</a>'
  apa: 'Qudus, U., Pokharel, N., Röder, M., &#38; Ngonga Ngomo, A.-C. (2026). No Need
    to Be a Know-It-All: Fact Checking with Shallow Knowledge. In <i>Lecture Notes
    in Computer Science</i>. Springer Nature Switzerland. <a href="https://doi.org/10.1007/978-3-032-25156-5_23">https://doi.org/10.1007/978-3-032-25156-5_23</a>'
  bibtex: '@inbook{Qudus_Pokharel_Röder_Ngonga Ngomo_2026, place={Cham}, title={No
    Need to Be a Know-It-All: Fact Checking with Shallow Knowledge}, DOI={<a href="https://doi.org/10.1007/978-3-032-25156-5_23">10.1007/978-3-032-25156-5_23</a>},
    booktitle={Lecture Notes in Computer Science}, publisher={Springer Nature Switzerland},
    author={Qudus, Umair and Pokharel, Neha and Röder, Michael and Ngonga Ngomo, Axel-Cyrille},
    year={2026} }'
  chicago: 'Qudus, Umair, Neha Pokharel, Michael Röder, and Axel-Cyrille Ngonga Ngomo.
    “No Need to Be a Know-It-All: Fact Checking with Shallow Knowledge.” In <i>Lecture
    Notes in Computer Science</i>. Cham: Springer Nature Switzerland, 2026. <a href="https://doi.org/10.1007/978-3-032-25156-5_23">https://doi.org/10.1007/978-3-032-25156-5_23</a>.'
  ieee: 'U. Qudus, N. Pokharel, M. Röder, and A.-C. Ngonga Ngomo, “No Need to Be a Know-It-All:
    Fact Checking with Shallow Knowledge,” in <i>Lecture Notes in Computer Science</i>,
    Cham: Springer Nature Switzerland, 2026.'
  mla: 'Qudus, Umair, et al. “No Need to Be a Know-It-All: Fact Checking with Shallow
    Knowledge.” <i>Lecture Notes in Computer Science</i>, Springer Nature Switzerland,
    2026, doi:<a href="https://doi.org/10.1007/978-3-032-25156-5_23">10.1007/978-3-032-25156-5_23</a>.'
  short: 'U. Qudus, N. Pokharel, M. Röder, A.-C. Ngonga Ngomo, in: Lecture Notes in
    Computer Science, Springer Nature Switzerland, Cham, 2026.'
date_created: 2026-05-21T11:45:24Z
date_updated: 2026-05-21T11:55:29Z
department:
- _id: '574'
doi: 10.1007/978-3-032-25156-5_23
keyword:
- fact checking
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: 'No Need to Be a Know-It-All: Fact Checking with Shallow Knowledge'
type: book_chapter
user_id: '83392'
year: '2026'
...
---
_id: '65566'
author:
- first_name: Anselm
  full_name: Haak, Anselm
  id: '109969'
  last_name: Haak
- first_name: Patrick
  full_name: Koopmann, Patrick
  last_name: Koopmann
- first_name: Yasir
  full_name: Mahmood, Yasir
  id: '99353'
  last_name: Mahmood
- first_name: Anni-Yasmin
  full_name: Turhan, Anni-Yasmin
  id: '104470'
  last_name: Turhan
citation:
  ama: 'Haak A, Koopmann P, Mahmood Y, Turhan A-Y. ABox Abduction for Inconsistent
    Knowledge Bases under Repair Semantics. In: ; 2026.'
  apa: Haak, A., Koopmann, P., Mahmood, Y., &#38; Turhan, A.-Y. (2026). <i>ABox Abduction
    for Inconsistent Knowledge Bases under Repair Semantics</i>. 23rd International
    Conference on Principles of Knowledge Representation and Reasoning, Lisbon.
  bibtex: '@inproceedings{Haak_Koopmann_Mahmood_Turhan_2026, title={ABox Abduction
    for Inconsistent Knowledge Bases under Repair Semantics}, author={Haak, Anselm
    and Koopmann, Patrick and Mahmood, Yasir and Turhan, Anni-Yasmin}, year={2026}
    }'
  chicago: Haak, Anselm, Patrick Koopmann, Yasir Mahmood, and Anni-Yasmin Turhan.
    “ABox Abduction for Inconsistent Knowledge Bases under Repair Semantics,” 2026.
  ieee: A. Haak, P. Koopmann, Y. Mahmood, and A.-Y. Turhan, “ABox Abduction for Inconsistent
    Knowledge Bases under Repair Semantics,” presented at the 23rd International Conference
    on Principles of Knowledge Representation and Reasoning, Lisbon, 2026.
  mla: Haak, Anselm, et al. <i>ABox Abduction for Inconsistent Knowledge Bases under
    Repair Semantics</i>. 2026.
  short: 'A. Haak, P. Koopmann, Y. Mahmood, A.-Y. Turhan, in: 2026.'
conference:
  end_date: 2026-07-23
  location: Lisbon
  name: 23rd International Conference on Principles of Knowledge Representation and
    Reasoning
  start_date: 2026-07-20
date_created: 2026-05-05T14:29:38Z
date_updated: 2026-05-21T08:26:07Z
department:
- _id: '888'
- _id: '574'
language:
- iso: eng
status: public
title: ABox Abduction for Inconsistent Knowledge Bases under Repair Semantics
type: conference
user_id: '109969'
year: '2026'
...
---
_id: '65682'
author:
- first_name: Mats
  full_name: Vernholz, Mats
  id: '76955'
  last_name: Vernholz
  orcid: 0000-0001-5175-357X
- first_name: Craig
  full_name: Sims, Craig
  last_name: Sims
- first_name: David
  full_name: Treagust, David
  last_name: Treagust
citation:
  ama: 'Vernholz M, Sims C, Treagust D. From Time-Saving to Skill-Building: Reframing
    Generative AI for Lesson-Planning—A Conceptual Design Paper. <i>Education Sciences</i>.
    2026;16(5):782. doi:<a href="https://doi.org/10.3390/educsci16050782">https://doi.org/10.3390/educsci16050782</a>'
  apa: 'Vernholz, M., Sims, C., &#38; Treagust, D. (2026). From Time-Saving to Skill-Building:
    Reframing Generative AI for Lesson-Planning—A Conceptual Design Paper. <i>Education
    Sciences</i>, <i>16</i>(5), 782. <a href="https://doi.org/10.3390/educsci16050782">https://doi.org/10.3390/educsci16050782</a>'
  bibtex: '@article{Vernholz_Sims_Treagust_2026, title={From Time-Saving to Skill-Building:
    Reframing Generative AI for Lesson-Planning—A Conceptual Design Paper}, volume={16},
    DOI={<a href="https://doi.org/10.3390/educsci16050782">https://doi.org/10.3390/educsci16050782</a>},
    number={5}, journal={Education Sciences}, author={Vernholz, Mats and Sims, Craig
    and Treagust, David}, year={2026}, pages={782} }'
  chicago: 'Vernholz, Mats, Craig Sims, and David Treagust. “From Time-Saving to Skill-Building:
    Reframing Generative AI for Lesson-Planning—A Conceptual Design Paper.” <i>Education
    Sciences</i> 16, no. 5 (2026): 782. <a href="https://doi.org/10.3390/educsci16050782">https://doi.org/10.3390/educsci16050782</a>.'
  ieee: 'M. Vernholz, C. Sims, and D. Treagust, “From Time-Saving to Skill-Building:
    Reframing Generative AI for Lesson-Planning—A Conceptual Design Paper,” <i>Education
    Sciences</i>, vol. 16, no. 5, p. 782, 2026, doi: <a href="https://doi.org/10.3390/educsci16050782">https://doi.org/10.3390/educsci16050782</a>.'
  mla: 'Vernholz, Mats, et al. “From Time-Saving to Skill-Building: Reframing Generative
    AI for Lesson-Planning—A Conceptual Design Paper.” <i>Education Sciences</i>,
    vol. 16, no. 5, 2026, p. 782, doi:<a href="https://doi.org/10.3390/educsci16050782">https://doi.org/10.3390/educsci16050782</a>.'
  short: M. Vernholz, C. Sims, D. Treagust, Education Sciences 16 (2026) 782.
date_created: 2026-05-26T06:19:30Z
date_updated: 2026-05-26T06:22:45Z
ddc:
- '370'
department:
- _id: '300'
doi: https://doi.org/10.3390/educsci16050782
file:
- access_level: open_access
  content_type: application/pdf
  creator: maver001
  date_created: 2026-05-26T06:19:27Z
  date_updated: 2026-05-26T06:19:27Z
  file_id: '65683'
  file_name: education-16-00782-v2 (1).pdf
  file_size: 2015567
  relation: main_file
file_date_updated: 2026-05-26T06:19:27Z
has_accepted_license: '1'
intvolume: '        16'
issue: '5'
language:
- iso: eng
oa: '1'
page: '782'
publication: Education Sciences
status: public
title: 'From Time-Saving to Skill-Building: Reframing Generative AI for Lesson-Planning—A
  Conceptual Design Paper'
type: journal_article
user_id: '76955'
volume: 16
year: '2026'
...
---
_id: '64211'
author:
- first_name: Vivien
  full_name: Wiebe, Vivien
  id: '77748'
  last_name: Wiebe
- first_name: Uta
  full_name: Häsel-Weide, Uta
  id: '60267'
  last_name: Häsel-Weide
  orcid: 0000-0001-6278-4240
citation:
  ama: 'Wiebe V, Häsel-Weide U.  Initiating and establishing mathematical practices
    of determining and transforming numbers as a foundational skill in fostering mathematics
    teaching. In: Mosvold R, Fauskanger J, Ferretti F, Vondrová N, Charles University,
    Faculty of Education and ERME, eds. <i>Proceedings of the Nineteenth ERME Topic
    Conference: Connecting the Learning of Mathematics Teaching to Practice</i>. ;
    2026:122-129.'
  apa: 'Wiebe, V., &#38; Häsel-Weide, U. (2026).  Initiating and establishing mathematical
    practices of determining and transforming numbers as a foundational skill in fostering
    mathematics teaching. In R. Mosvold, J. Fauskanger, F. Ferretti, N. Vondrová,
    &#38; Charles University, Faculty of Education and ERME (Eds.), <i>Proceedings
    of the Nineteenth ERME Topic Conference: Connecting the Learning of Mathematics
    Teaching to Practice</i> (pp. 122–129).'
  bibtex: '@inproceedings{Wiebe_Häsel-Weide_2026, place={Prag}, title={ Initiating
    and establishing mathematical practices of determining and transforming numbers
    as a foundational skill in fostering mathematics teaching}, booktitle={Proceedings
    of the Nineteenth ERME Topic Conference: Connecting the Learning of Mathematics
    Teaching to Practice}, author={Wiebe, Vivien and Häsel-Weide, Uta}, editor={Mosvold,
    R. and Fauskanger, J. and Ferretti, F. and Vondrová, N. and Charles University,
    Faculty of Education and ERME}, year={2026}, pages={122–129} }'
  chicago: 'Wiebe, Vivien, and Uta Häsel-Weide. “ Initiating and Establishing Mathematical
    Practices of Determining and Transforming Numbers as a Foundational Skill in Fostering
    Mathematics Teaching.” In <i>Proceedings of the Nineteenth ERME Topic Conference:
    Connecting the Learning of Mathematics Teaching to Practice</i>, edited by R.
    Mosvold, J. Fauskanger, F. Ferretti, N. Vondrová, and Charles University, Faculty
    of Education and ERME, 122–29. Prag, 2026.'
  ieee: 'V. Wiebe and U. Häsel-Weide, “ Initiating and establishing mathematical practices
    of determining and transforming numbers as a foundational skill in fostering mathematics
    teaching,” in <i>Proceedings of the Nineteenth ERME Topic Conference: Connecting
    the Learning of Mathematics Teaching to Practice</i>, Prag, 2026, pp. 122–129.'
  mla: 'Wiebe, Vivien, and Uta Häsel-Weide. “ Initiating and Establishing Mathematical
    Practices of Determining and Transforming Numbers as a Foundational Skill in Fostering
    Mathematics Teaching.” <i>Proceedings of the Nineteenth ERME Topic Conference:
    Connecting the Learning of Mathematics Teaching to Practice</i>, edited by R.
    Mosvold et al., 2026, pp. 122–29.'
  short: 'V. Wiebe, U. Häsel-Weide, in: R. Mosvold, J. Fauskanger, F. Ferretti, N.
    Vondrová, Charles University, Faculty of Education and ERME (Eds.), Proceedings
    of the Nineteenth ERME Topic Conference: Connecting the Learning of Mathematics
    Teaching to Practice, Prag, 2026, pp. 122–129.'
conference:
  location: Prag
  name: Nineteenth ERME Topic Conference
corporate_editor:
- Charles University, Faculty of Education and ERME
date_created: 2026-02-18T10:41:23Z
date_updated: 2026-05-26T07:56:19Z
department:
- _id: '543'
editor:
- first_name: R.
  full_name: Mosvold, R.
  last_name: Mosvold
- first_name: J.
  full_name: Fauskanger, J.
  last_name: Fauskanger
- first_name: F.
  full_name: Ferretti, F.
  last_name: Ferretti
- first_name: N.
  full_name: Vondrová, N.
  last_name: Vondrová
language:
- iso: eng
page: 122-129
place: Prag
publication: 'Proceedings of the Nineteenth ERME Topic Conference: Connecting the
  Learning of Mathematics Teaching to Practice'
related_material:
  link:
  - relation: confirmation
    url: https://hal.science/hal-05463964v1
status: public
title: ' Initiating and establishing mathematical practices of determining and transforming
  numbers as a foundational skill in fostering mathematics teaching'
type: conference
user_id: '44184'
year: '2026'
...
---
_id: '65733'
abstract:
- lang: eng
  text: "<jats:title>Abstract</jats:title>\r\n                  <jats:p>\r\n                    In
    this paper, we study the computation of shortest paths within the\r\n                    <jats:italic>geometric
    amoebot model</jats:italic>\r\n                    , a commonly used model for
    programmable matter. Shortest paths are essential for various tasks and therefore
    have been heavily investigated in many different contexts. We consider the\r\n
    \                   <jats:italic>reconfigurable circuit extension</jats:italic>\r\n
    \                   of the model where the amoebot structure is able to interconnect
    amoebots by so-called circuits. These circuits permit the instantaneous transmission
    of simple signals between connected amoebots. We propose distributed algorithms
    for the\r\n                    <jats:italic>shortest path forest problem</jats:italic>\r\n
    \                   where, given a set of\r\n                    <jats:italic>k</jats:italic>\r\n
    \                   sources and a set of\r\n                    <jats:inline-formula>\r\n
    \                     <jats:alternatives>\r\n                        <jats:tex-math>$$\\ell
    $$</jats:tex-math>\r\n                        <mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\">\r\n
    \                         <mml:mi>ℓ</mml:mi>\r\n                        </mml:math>\r\n
    \                     </jats:alternatives>\r\n                    </jats:inline-formula>\r\n
    \                   destinations, the amoebot structure has to compute a forest
    that connects each destination to its closest source on a shortest path. Our main
    results are two algorithms for hole-free structures. The first algorithm constructs
    a shortest path tree for a single source within\r\n                    <jats:inline-formula>\r\n
    \                     <jats:alternatives>\r\n                        <jats:tex-math>$$O(\\log
    \\ell )$$</jats:tex-math>\r\n                        <mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\">\r\n
    \                         <mml:mrow>\r\n                            <mml:mi>O</mml:mi>\r\n
    \                           <mml:mo>(</mml:mo>\r\n                            <mml:mo>log</mml:mo>\r\n
    \                           <mml:mi>ℓ</mml:mi>\r\n                            <mml:mo>)</mml:mo>\r\n
    \                         </mml:mrow>\r\n                        </mml:math>\r\n
    \                     </jats:alternatives>\r\n                    </jats:inline-formula>\r\n
    \                   rounds, and the second algorithm a shortest path forest for
    an arbitrary number of sources within\r\n                    <jats:inline-formula>\r\n
    \                     <jats:alternatives>\r\n                        <jats:tex-math>$$O(\\log
    n \\log ^2 k)$$</jats:tex-math>\r\n                        <mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\">\r\n
    \                         <mml:mrow>\r\n                            <mml:mi>O</mml:mi>\r\n
    \                           <mml:mo>(</mml:mo>\r\n                            <mml:mo>log</mml:mo>\r\n
    \                           <mml:mi>n</mml:mi>\r\n                            <mml:msup>\r\n
    \                             <mml:mo>log</mml:mo>\r\n                              <mml:mn>2</mml:mn>\r\n
    \                           </mml:msup>\r\n                            <mml:mi>k</mml:mi>\r\n
    \                           <mml:mo>)</mml:mo>\r\n                          </mml:mrow>\r\n
    \                       </mml:math>\r\n                      </jats:alternatives>\r\n
    \                   </jats:inline-formula>\r\n                    rounds. The
    former algorithm also provides an\r\n                    <jats:italic>O</jats:italic>\r\n
    \                   (1) rounds solution for the\r\n                    <jats:italic>single
    pair shortest path problem</jats:italic>\r\n                    (SPSP) and an\r\n
    \                   <jats:inline-formula>\r\n                      <jats:alternatives>\r\n
    \                       <jats:tex-math>$$O(\\log n)$$</jats:tex-math>\r\n                        <mml:math
    xmlns:mml=\"http://www.w3.org/1998/Math/MathML\">\r\n                          <mml:mrow>\r\n
    \                           <mml:mi>O</mml:mi>\r\n                            <mml:mo>(</mml:mo>\r\n
    \                           <mml:mo>log</mml:mo>\r\n                            <mml:mi>n</mml:mi>\r\n
    \                           <mml:mo>)</mml:mo>\r\n                          </mml:mrow>\r\n
    \                       </mml:math>\r\n                      </jats:alternatives>\r\n
    \                   </jats:inline-formula>\r\n                    rounds solution
    for the\r\n                    <jats:italic>single source shortest path problem</jats:italic>\r\n
    \                   (SSSP) since these problems are special cases of the considered
    problem. Then, we adapt the latter algorithm to an offset version of the problem.
    This allows us to solve the problem for amoebot structures with holes within\r\n
    \                   <jats:inline-formula>\r\n                      <jats:alternatives>\r\n
    \                       <jats:tex-math>$$O(h \\log ^3 n)$$</jats:tex-math>\r\n
    \                       <mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\">\r\n
    \                         <mml:mrow>\r\n                            <mml:mi>O</mml:mi>\r\n
    \                           <mml:mo>(</mml:mo>\r\n                            <mml:mi>h</mml:mi>\r\n
    \                           <mml:msup>\r\n                              <mml:mo>log</mml:mo>\r\n
    \                             <mml:mn>3</mml:mn>\r\n                            </mml:msup>\r\n
    \                           <mml:mi>n</mml:mi>\r\n                            <mml:mo>)</mml:mo>\r\n
    \                         </mml:mrow>\r\n                        </mml:math>\r\n
    \                     </jats:alternatives>\r\n                    </jats:inline-formula>\r\n
    \                   rounds w.h.p. where\r\n                    <jats:italic>h</jats:italic>\r\n
    \                   denotes the number of holes.\r\n                  </jats:p>"
article_number: '15'
author:
- first_name: Andreas
  full_name: Padalkin, Andreas
  id: '88238'
  last_name: Padalkin
- first_name: Christian
  full_name: Scheideler, Christian
  id: '20792'
  last_name: Scheideler
citation:
  ama: Padalkin A, Scheideler C. Polylogarithmic time algorithms for shortest path
    forests in programmable matter. <i>Distributed Computing</i>. 2026;39(2). doi:<a
    href="https://doi.org/10.1007/s00446-026-00505-2">10.1007/s00446-026-00505-2</a>
  apa: Padalkin, A., &#38; Scheideler, C. (2026). Polylogarithmic time algorithms
    for shortest path forests in programmable matter. <i>Distributed Computing</i>,
    <i>39</i>(2), Article 15. <a href="https://doi.org/10.1007/s00446-026-00505-2">https://doi.org/10.1007/s00446-026-00505-2</a>
  bibtex: '@article{Padalkin_Scheideler_2026, title={Polylogarithmic time algorithms
    for shortest path forests in programmable matter}, volume={39}, DOI={<a href="https://doi.org/10.1007/s00446-026-00505-2">10.1007/s00446-026-00505-2</a>},
    number={215}, journal={Distributed Computing}, publisher={Springer Science and
    Business Media LLC}, author={Padalkin, Andreas and Scheideler, Christian}, year={2026}
    }'
  chicago: Padalkin, Andreas, and Christian Scheideler. “Polylogarithmic Time Algorithms
    for Shortest Path Forests in Programmable Matter.” <i>Distributed Computing</i>
    39, no. 2 (2026). <a href="https://doi.org/10.1007/s00446-026-00505-2">https://doi.org/10.1007/s00446-026-00505-2</a>.
  ieee: 'A. Padalkin and C. Scheideler, “Polylogarithmic time algorithms for shortest
    path forests in programmable matter,” <i>Distributed Computing</i>, vol. 39, no.
    2, Art. no. 15, 2026, doi: <a href="https://doi.org/10.1007/s00446-026-00505-2">10.1007/s00446-026-00505-2</a>.'
  mla: Padalkin, Andreas, and Christian Scheideler. “Polylogarithmic Time Algorithms
    for Shortest Path Forests in Programmable Matter.” <i>Distributed Computing</i>,
    vol. 39, no. 2, 15, Springer Science and Business Media LLC, 2026, doi:<a href="https://doi.org/10.1007/s00446-026-00505-2">10.1007/s00446-026-00505-2</a>.
  short: A. Padalkin, C. Scheideler, Distributed Computing 39 (2026).
date_created: 2026-05-29T12:11:32Z
date_updated: 2026-05-29T12:13:09Z
department:
- _id: '34'
- _id: '7'
- _id: '79'
doi: 10.1007/s00446-026-00505-2
intvolume: '        39'
issue: '2'
language:
- iso: eng
publication: Distributed Computing
publication_identifier:
  issn:
  - 0178-2770
  - 1432-0452
publication_status: published
publisher: Springer Science and Business Media LLC
status: public
title: Polylogarithmic time algorithms for shortest path forests in programmable matter
type: journal_article
user_id: '15578'
volume: 39
year: '2026'
...
---
_id: '65745'
abstract:
- lang: eng
  text: "<jats:title>Abstract</jats:title>\r\n                  <jats:p>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.</jats:p>"
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. <i>Journal of Physics A: Mathematical
    and Theoretical</i>. Published online 2026. doi:<a href="https://doi.org/10.1088/1751-8121/ae6d51">10.1088/1751-8121/ae6d51</a>'
  apa: 'Offen, C., Wembe, B., Ares, L., Sperling, J., &#38; Ober-Blöbaum, S. (2026).
    Numerical approaches to entangling dynamics from variational principles. <i>Journal
    of Physics A: Mathematical and Theoretical</i>. <a href="https://doi.org/10.1088/1751-8121/ae6d51">https://doi.org/10.1088/1751-8121/ae6d51</a>'
  bibtex: '@article{Offen_Wembe_Ares_Sperling_Ober-Blöbaum_2026, title={Numerical
    approaches to entangling dynamics from variational principles}, DOI={<a href="https://doi.org/10.1088/1751-8121/ae6d51">10.1088/1751-8121/ae6d51</a>},
    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.” <i>Journal
    of Physics A: Mathematical and Theoretical</i>, 2026. <a href="https://doi.org/10.1088/1751-8121/ae6d51">https://doi.org/10.1088/1751-8121/ae6d51</a>.'
  ieee: 'C. Offen, B. Wembe, L. Ares, J. Sperling, and S. Ober-Blöbaum, “Numerical
    approaches to entangling dynamics from variational principles,” <i>Journal of
    Physics A: Mathematical and Theoretical</i>, 2026, doi: <a href="https://doi.org/10.1088/1751-8121/ae6d51">10.1088/1751-8121/ae6d51</a>.'
  mla: 'Offen, Christian, et al. “Numerical Approaches to Entangling Dynamics from
    Variational Principles.” <i>Journal of Physics A: Mathematical and Theoretical</i>,
    IOP Publishing, 2026, doi:<a href="https://doi.org/10.1088/1751-8121/ae6d51">10.1088/1751-8121/ae6d51</a>.'
  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: "<jats:title>Abstract</jats:title>\r\n                  <jats:p>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.</jats:p>"
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. <i>Journal of Physics A: Mathematical
    and Theoretical</i>. Published online 2026. doi:<a href="https://doi.org/10.1088/1751-8121/ae6d51">10.1088/1751-8121/ae6d51</a>'
  apa: 'Offen, C., Wembe, B., Ares, L., Sperling, J., &#38; Ober-Blöbaum, S. (2026).
    Numerical approaches to entangling dynamics from variational principles. <i>Journal
    of Physics A: Mathematical and Theoretical</i>. <a href="https://doi.org/10.1088/1751-8121/ae6d51">https://doi.org/10.1088/1751-8121/ae6d51</a>'
  bibtex: '@article{Offen_Wembe_Ares_Sperling_Ober-Blöbaum_2026, title={Numerical
    approaches to entangling dynamics from variational principles}, DOI={<a href="https://doi.org/10.1088/1751-8121/ae6d51">10.1088/1751-8121/ae6d51</a>},
    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.” <i>Journal
    of Physics A: Mathematical and Theoretical</i>, 2026. <a href="https://doi.org/10.1088/1751-8121/ae6d51">https://doi.org/10.1088/1751-8121/ae6d51</a>.'
  ieee: 'C. Offen, B. Wembe, L. Ares, J. Sperling, and S. Ober-Blöbaum, “Numerical
    approaches to entangling dynamics from variational principles,” <i>Journal of
    Physics A: Mathematical and Theoretical</i>, 2026, doi: <a href="https://doi.org/10.1088/1751-8121/ae6d51">10.1088/1751-8121/ae6d51</a>.'
  mla: 'Offen, Christian, et al. “Numerical Approaches to Entangling Dynamics from
    Variational Principles.” <i>Journal of Physics A: Mathematical and Theoretical</i>,
    IOP Publishing, 2026, doi:<a href="https://doi.org/10.1088/1751-8121/ae6d51">10.1088/1751-8121/ae6d51</a>.'
  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:<a href="https://doi.org/10.48550/ARXIV.2603.11697">10.48550/ARXIV.2603.11697</a>'
  apa: Wembe Moafo, B. E., Ali, U., Meier, T., &#38; Ober-Blöbaum, S. (2026). <i>Cayley
    Commutator-free Methods for Krotov-Type Algorithms in Quantum Optimal Control</i>.
    European Control Conference, Reykjavík, Iceland. <a href="https://doi.org/10.48550/ARXIV.2603.11697">https://doi.org/10.48550/ARXIV.2603.11697</a>
  bibtex: '@inproceedings{Wembe Moafo_Ali_Meier_Ober-Blöbaum_2026, title={Cayley Commutator-free
    Methods for Krotov-Type Algorithms in Quantum Optimal Control}, DOI={<a href="https://doi.org/10.48550/ARXIV.2603.11697">10.48550/ARXIV.2603.11697</a>},
    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. <a href="https://doi.org/10.48550/ARXIV.2603.11697">https://doi.org/10.48550/ARXIV.2603.11697</a>.
  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: <a href="https://doi.org/10.48550/ARXIV.2603.11697">10.48550/ARXIV.2603.11697</a>.'
  mla: Wembe Moafo, Boris Edgar, et al. <i>Cayley Commutator-Free Methods for Krotov-Type
    Algorithms in Quantum Optimal Control</i>. 2026, doi:<a href="https://doi.org/10.48550/ARXIV.2603.11697">10.48550/ARXIV.2603.11697</a>.
  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: '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., &#38; Wembe Moafo, B. E. (n.d.). <i>Non
    static exponential turnpike property for optimal control problems with symmetries
    and boundary conditions</i>.
  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. <i>Non Static Exponential Turnpike Property for
    Optimal Control Problems with Symmetries and Boundary Conditions</i>.
  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. <i>Journal of Physics A: Mathematical
    and Theoretical</i>. Published online 2026. doi:<a href="https://doi.org/10.1088/1751-8121/ae6d51">10.1088/1751-8121/ae6d51</a>'
  apa: 'Offen, C., Wembe, B., Ares, L., Sperling, J., &#38; Ober-Blöbaum, S. (2026).
    Numerical approaches to entangling dynamics from variational principles. <i>Journal
    of Physics A: Mathematical and Theoretical</i>. <a href="https://doi.org/10.1088/1751-8121/ae6d51">https://doi.org/10.1088/1751-8121/ae6d51</a>'
  bibtex: '@article{Offen_Wembe_Ares_Sperling_Ober-Blöbaum_2026, title={Numerical
    approaches to entangling dynamics from variational principles}, DOI={<a href="https://doi.org/10.1088/1751-8121/ae6d51">10.1088/1751-8121/ae6d51</a>},
    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.” <i>Journal
    of Physics A: Mathematical and Theoretical</i>, 2026. <a href="https://doi.org/10.1088/1751-8121/ae6d51">https://doi.org/10.1088/1751-8121/ae6d51</a>.'
  ieee: 'C. Offen, B. Wembe, L. Ares, J. Sperling, and S. Ober-Blöbaum, “Numerical
    approaches to entangling dynamics from variational principles,” <i>Journal of
    Physics A: Mathematical and Theoretical</i>, 2026, doi: <a href="https://doi.org/10.1088/1751-8121/ae6d51">10.1088/1751-8121/ae6d51</a>.'
  mla: 'Offen, Christian, et al. “Numerical Approaches to Entangling Dynamics from
    Variational Principles.” <i>Journal of Physics A: Mathematical and Theoretical</i>,
    IOP Publishing, 2026, doi:<a href="https://doi.org/10.1088/1751-8121/ae6d51">10.1088/1751-8121/ae6d51</a>.'
  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: '65749'
abstract:
- lang: eng
  text: "<jats:title>Abstract</jats:title>\r\n                  <jats:p>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.</jats:p>\r\n                  <jats:p>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.</jats:p>"
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: <i>Springer Series in Optical Sciences</i>. Springer Nature Switzerland; 2026.
    doi:<a href="https://doi.org/10.1007/978-3-032-01986-8_4">10.1007/978-3-032-01986-8_4</a>'
  apa: Bahmanian, M., Scheytt, J. C., Meyne, N., &#38; Kleine-Ostmann, T. (2026).
    Phase Noise Metrology. In <i>Springer Series in Optical Sciences</i>. Springer
    Nature Switzerland. <a href="https://doi.org/10.1007/978-3-032-01986-8_4">https://doi.org/10.1007/978-3-032-01986-8_4</a>
  bibtex: '@inbook{Bahmanian_Scheytt_Meyne_Kleine-Ostmann_2026, place={Cham}, title={Phase
    Noise Metrology}, DOI={<a href="https://doi.org/10.1007/978-3-032-01986-8_4">10.1007/978-3-032-01986-8_4</a>},
    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 <i>Springer Series in Optical Sciences</i>. Cham:
    Springer Nature Switzerland, 2026. <a href="https://doi.org/10.1007/978-3-032-01986-8_4">https://doi.org/10.1007/978-3-032-01986-8_4</a>.'
  ieee: 'M. Bahmanian, J. C. Scheytt, N. Meyne, and T. Kleine-Ostmann, “Phase Noise
    Metrology,” in <i>Springer Series in Optical Sciences</i>, Cham: Springer Nature
    Switzerland, 2026.'
  mla: Bahmanian, Meysam, et al. “Phase Noise Metrology.” <i>Springer Series in Optical
    Sciences</i>, Springer Nature Switzerland, 2026, doi:<a href="https://doi.org/10.1007/978-3-032-01986-8_4">10.1007/978-3-032-01986-8_4</a>.
  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: '65748'
abstract:
- lang: eng
  text: "<jats:title>Abstract</jats:title>\r\n                  <jats:p>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.</jats:p>"
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: <i>Springer
    Series in Optical Sciences</i>. Springer Nature Switzerland; 2026. doi:<a href="https://doi.org/10.1007/978-3-032-01986-8_28">10.1007/978-3-032-01986-8_28</a>'
  apa: Bahmanian, M., &#38; Scheytt, J. C. (2026). Frequency Synthesis Based on MLLs.
    In <i>Springer Series in Optical Sciences</i>. Springer Nature Switzerland. <a
    href="https://doi.org/10.1007/978-3-032-01986-8_28">https://doi.org/10.1007/978-3-032-01986-8_28</a>
  bibtex: '@inbook{Bahmanian_Scheytt_2026, place={Cham}, title={Frequency Synthesis
    Based on MLLs}, DOI={<a href="https://doi.org/10.1007/978-3-032-01986-8_28">10.1007/978-3-032-01986-8_28</a>},
    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 <i>Springer Series in Optical Sciences</i>. Cham: Springer Nature
    Switzerland, 2026. <a href="https://doi.org/10.1007/978-3-032-01986-8_28">https://doi.org/10.1007/978-3-032-01986-8_28</a>.'
  ieee: 'M. Bahmanian and J. C. Scheytt, “Frequency Synthesis Based on MLLs,” in <i>Springer
    Series in Optical Sciences</i>, Cham: Springer Nature Switzerland, 2026.'
  mla: Bahmanian, Meysam, and J. Christoph Scheytt. “Frequency Synthesis Based on
    MLLs.” <i>Springer Series in Optical Sciences</i>, Springer Nature Switzerland,
    2026, doi:<a href="https://doi.org/10.1007/978-3-032-01986-8_28">10.1007/978-3-032-01986-8_28</a>.
  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: <i>Lecture Notes in Mechanical Engineering</i>. Springer Nature Switzerland;
    2026. doi:<a href="https://doi.org/10.1007/978-3-032-21157-6_39">10.1007/978-3-032-21157-6_39</a>'
  apa: 'Twardzik, J. L., Humpert, L., Cichon, G., &#38; Dumitrescu, R. (2026). Knowledge
    Gaps in Circular Product Development: A Systematic Literature Review of the Manufacturing
    Industry. In <i>Lecture Notes in Mechanical Engineering</i>. Springer Nature Switzerland.
    <a href="https://doi.org/10.1007/978-3-032-21157-6_39">https://doi.org/10.1007/978-3-032-21157-6_39</a>'
  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={<a href="https://doi.org/10.1007/978-3-032-21157-6_39">10.1007/978-3-032-21157-6_39</a>},
    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 <i>Lecture Notes in Mechanical Engineering</i>.
    Cham: Springer Nature Switzerland, 2026. <a href="https://doi.org/10.1007/978-3-032-21157-6_39">https://doi.org/10.1007/978-3-032-21157-6_39</a>.'
  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 <i>Lecture Notes in Mechanical Engineering</i>, 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.” <i>Lecture Notes
    in Mechanical Engineering</i>, Springer Nature Switzerland, 2026, doi:<a href="https://doi.org/10.1007/978-3-032-21157-6_39">10.1007/978-3-032-21157-6_39</a>.'
  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: '65757'
abstract:
- lang: eng
  text: Electrifying the heating sector is essential for achieving global climate
    targets like the Paris Agreement’s 1.5 °C goal. In Germany, where 80  % of household
    energy goes to space heating and hot water, shifting to low-carbon solutions is
    crucial. Fossil-fuelled district heating networks can incorporate renewable energy
    via heat pumps, improving efficiency. Although heat pump design typically favours
    minimal temperature lifts, higher lifts can be economically viable with low electricity
    prices and abundant renewables. Adding thermal energy storage boosts operational
    flexibility. This study explores a flexible heat pump operation incorporating
    part load behaviour with a thermal energy storage in a German city’s district
    heating system to minimise costs and carbon dioxide emissions. Using a mixed-integer
    linear programming model, it examines the impact of temperature adjustments and
    storage on system efficiency. The results show that the integration of a heat
    pump in a district heating system reduces operating costs. Compared to a supply
    without a heat pump, with levelised cost of heating of 9.98 cent/kWhth and a fixed
    operating mode with costs between 9.96 cent/kWhth and 11.49 cent/kWhth, the flexible
    use results in lowest costs of 9.85 cent/kWhth, while also reducing overall CO2
    emissions. Using a full factorial sensitivity analysis, the levelised cost of
    heating ranged between 9.15 cent/kWhth in the best case and 10.37 cent/kWhth in
    the worst case for the selected configuration.
article_number: '121714'
article_type: original
author:
- first_name: Henning Christoph
  full_name: Rahlf, Henning Christoph
  id: '56955'
  last_name: Rahlf
  orcid: 0009-0006-8106-2132
- first_name: Denis
  full_name: Divkovic, Denis
  id: '89059'
  last_name: Divkovic
- first_name: Lukas
  full_name: Knorr, Lukas
  id: '90391'
  last_name: Knorr
  orcid: 0009-0005-4727-7511
- first_name: Florian
  full_name: Schlosser, Florian
  id: '88614'
  last_name: Schlosser
- first_name: Henning
  full_name: Meschede, Henning
  id: '86954'
  last_name: Meschede
  orcid: 0000-0002-1538-089X
citation:
  ama: Rahlf HC, Divkovic D, Knorr L, Schlosser F, Meschede H. Flexible operation
    strategies for heat pumps in district heating systems using dynamic electricity
    prices. <i>Energy Conversion and Management</i>. 2026;364. doi:<a href="https://doi.org/10.1016/j.enconman.2026.121714">10.1016/j.enconman.2026.121714</a>
  apa: Rahlf, H. C., Divkovic, D., Knorr, L., Schlosser, F., &#38; Meschede, H. (2026).
    Flexible operation strategies for heat pumps in district heating systems using
    dynamic electricity prices. <i>Energy Conversion and Management</i>, <i>364</i>,
    Article 121714. <a href="https://doi.org/10.1016/j.enconman.2026.121714">https://doi.org/10.1016/j.enconman.2026.121714</a>
  bibtex: '@article{Rahlf_Divkovic_Knorr_Schlosser_Meschede_2026, title={Flexible
    operation strategies for heat pumps in district heating systems using dynamic
    electricity prices}, volume={364}, DOI={<a href="https://doi.org/10.1016/j.enconman.2026.121714">10.1016/j.enconman.2026.121714</a>},
    number={121714}, journal={Energy Conversion and Management}, publisher={Elsevier
    BV}, author={Rahlf, Henning Christoph and Divkovic, Denis and Knorr, Lukas and
    Schlosser, Florian and Meschede, Henning}, year={2026} }'
  chicago: Rahlf, Henning Christoph, Denis Divkovic, Lukas Knorr, Florian Schlosser,
    and Henning Meschede. “Flexible Operation Strategies for Heat Pumps in District
    Heating Systems Using Dynamic Electricity Prices.” <i>Energy Conversion and Management</i>
    364 (2026). <a href="https://doi.org/10.1016/j.enconman.2026.121714">https://doi.org/10.1016/j.enconman.2026.121714</a>.
  ieee: 'H. C. Rahlf, D. Divkovic, L. Knorr, F. Schlosser, and H. Meschede, “Flexible
    operation strategies for heat pumps in district heating systems using dynamic
    electricity prices,” <i>Energy Conversion and Management</i>, vol. 364, Art. no.
    121714, 2026, doi: <a href="https://doi.org/10.1016/j.enconman.2026.121714">10.1016/j.enconman.2026.121714</a>.'
  mla: Rahlf, Henning Christoph, et al. “Flexible Operation Strategies for Heat Pumps
    in District Heating Systems Using Dynamic Electricity Prices.” <i>Energy Conversion
    and Management</i>, vol. 364, 121714, Elsevier BV, 2026, doi:<a href="https://doi.org/10.1016/j.enconman.2026.121714">10.1016/j.enconman.2026.121714</a>.
  short: H.C. Rahlf, D. Divkovic, L. Knorr, F. Schlosser, H. Meschede, Energy Conversion
    and Management 364 (2026).
date_created: 2026-06-03T06:34:27Z
date_updated: 2026-06-03T06:44:31Z
department:
- _id: '644'
- _id: '534'
doi: 10.1016/j.enconman.2026.121714
intvolume: '       364'
keyword:
- Heat transition
- Optimisation
- Temperature flexibility
- Decarbonisation
- Multi energy
language:
- iso: eng
main_file_link:
- open_access: '1'
  url: https://www.sciencedirect.com/science/article/pii/S0196890426006837
oa: '1'
project:
- _id: '1495'
  name: FlexLabQuartier
publication: Energy Conversion and Management
publication_identifier:
  issn:
  - 0196-8904
publication_status: published
publisher: Elsevier BV
status: public
title: Flexible operation strategies for heat pumps in district heating systems using
  dynamic electricity prices
type: journal_article
user_id: '56955'
volume: 364
year: '2026'
...
---
_id: '63838'
abstract:
- lang: eng
  text: "Industrial electrification is increasing to reduce fossil fuel dependence,
    alongside a growing share of volatile renewables.\r\nA secure and reliable energy
    supply is crucial for industry, leading to a shift from centralised to decentralised
    grid structures.\r\nDC microgrids becoming increasingly popular in industry, since
    they enable energy recuperation from braking, reduce components and cables, and
    integrate storage and local generation to manage supply interruptions or peak
    loads.\r\nEVs add further synergies by serving as mobile storage units, helping
    to store and redistribute locally generated renewable energy.\r\nThis paper analyses
    how EV integration in droop-controlled DC grids can contribute to a more stable,
    low-emission and peak-reduced load profile to the supply grid through load shifting
    and bridge interruptions.\r\nA droop-controlled DC grid model has been developed,
    incorporating an EV charging park based on probability functions.\r\nScalable
    scenarios allow for diverse condition analysis using an energy management system
    that utilises fuzzy logic and sequential MILP optimisation.\r\nIt has been shown
    that a 7% improvement of coefficient represented grid-serving behaviour is possible
    by load shifting.\r\nIt has also been demonstrated that an optimised EMS can reduce
    the demand-based CO2 emissions by 41kg for a representative day compared to a
    fuzzy logic EMS.\r\nAt the same time peak load is decreased yielding a more constant
    residual load.\r\nThese results highlight the potential of a controlled bidirectional
    charging infrastructure in DC grids and underscore the need to explicitly consider
    charging processes to ensure a residual load as constant as possible."
article_number: '100227'
article_type: original
author:
- first_name: Henning Christoph
  full_name: Rahlf, Henning Christoph
  id: '56955'
  last_name: Rahlf
  orcid: 0009-0006-8106-2132
- first_name: Lukas
  full_name: Knorr, Lukas
  id: '90391'
  last_name: Knorr
  orcid: 0009-0005-4727-7511
- first_name: Simon
  full_name: Althoff, Simon
  last_name: Althoff
- first_name: Henning
  full_name: Meschede, Henning
  id: '86954'
  last_name: Meschede
  orcid: 0000-0002-1538-089X
citation:
  ama: Rahlf HC, Knorr L, Althoff S, Meschede H. Analysis of bidirectional EV charging
    infrastructures within industrial DC grids. <i>Smart Energy</i>. Published online
    2026. doi:<a href="https://doi.org/10.1016/j.segy.2026.100227">10.1016/j.segy.2026.100227</a>
  apa: Rahlf, H. C., Knorr, L., Althoff, S., &#38; Meschede, H. (2026). Analysis of
    bidirectional EV charging infrastructures within industrial DC grids. <i>Smart
    Energy</i>, Article 100227. <a href="https://doi.org/10.1016/j.segy.2026.100227">https://doi.org/10.1016/j.segy.2026.100227</a>
  bibtex: '@article{Rahlf_Knorr_Althoff_Meschede_2026, title={Analysis of bidirectional
    EV charging infrastructures within industrial DC grids}, DOI={<a href="https://doi.org/10.1016/j.segy.2026.100227">10.1016/j.segy.2026.100227</a>},
    number={100227}, journal={Smart Energy}, publisher={Elsevier BV}, author={Rahlf,
    Henning Christoph and Knorr, Lukas and Althoff, Simon and Meschede, Henning},
    year={2026} }'
  chicago: Rahlf, Henning Christoph, Lukas Knorr, Simon Althoff, and Henning Meschede.
    “Analysis of Bidirectional EV Charging Infrastructures within Industrial DC Grids.”
    <i>Smart Energy</i>, 2026. <a href="https://doi.org/10.1016/j.segy.2026.100227">https://doi.org/10.1016/j.segy.2026.100227</a>.
  ieee: 'H. C. Rahlf, L. Knorr, S. Althoff, and H. Meschede, “Analysis of bidirectional
    EV charging infrastructures within industrial DC grids,” <i>Smart Energy</i>,
    Art. no. 100227, 2026, doi: <a href="https://doi.org/10.1016/j.segy.2026.100227">10.1016/j.segy.2026.100227</a>.'
  mla: Rahlf, Henning Christoph, et al. “Analysis of Bidirectional EV Charging Infrastructures
    within Industrial DC Grids.” <i>Smart Energy</i>, 100227, Elsevier BV, 2026, doi:<a
    href="https://doi.org/10.1016/j.segy.2026.100227">10.1016/j.segy.2026.100227</a>.
  short: H.C. Rahlf, L. Knorr, S. Althoff, H. Meschede, Smart Energy (2026).
date_created: 2026-02-02T14:45:17Z
date_updated: 2026-06-03T06:42:54Z
department:
- _id: '644'
doi: 10.1016/j.segy.2026.100227
keyword:
- DC-grid
- Droop control
- Grid-serving behaviour
- Grid stability
- Bidirectional charging
- Sequential decision
- MILP optimisation
language:
- iso: eng
main_file_link:
- open_access: '1'
  url: https://www.sciencedirect.com/science/article/pii/S266695522600002X
oa: '1'
publication: Smart Energy
publication_identifier:
  issn:
  - 2666-9552
publication_status: published
publisher: Elsevier BV
quality_controlled: '1'
status: public
title: Analysis of bidirectional EV charging infrastructures within industrial DC
  grids
type: journal_article
user_id: '56955'
year: '2026'
...
---
_id: '65785'
abstract:
- lang: eng
  text: Simulation-based design of high-power ultrasonic systems depends on the accurate
    modelling of the electromechanical behaviour of piezoceramic materials. In practical
    transducer applications, the relevant operating points are influenced by mechanical
    preload and heating, both of which give rise to changes in the elastic, dielectric,
    and piezoelectric material properties. Material parameters identified under idealised,
    unloaded conditions are therefore insufficient to represent piezoceramic material
    behaviour under realistic operating conditions. To overcome this limitation, experimental
    setups are developed that enable the measurement of electrical impedance spectra
    under controlled thermal and mechanical conditions. The acquired impedance data
    are used in an inverse identification procedure, in which the behaviour of a finite
    element forward model is iteratively fitted to the measurements using a block
    coordinate descent optimisation strategy guided by a sensitivity analysis. This
    yields effective linear material parameters as a function of temperature and mechanical
    stress at varying operating points. The identified temperature-dependent parameters,
    for instance, can be employed in a coupled thermo-electromechanical simulation
    framework to predict the temperature-dependent material behaviour during operation.
    The linear identification based on varying operation points provides an initial
    approximation of the nonlinear material response, establishing a basis for the
    development of corresponding nonlinear material models.
author:
- first_name: Olga
  full_name: Friesen, Olga
  id: '44026'
  last_name: Friesen
  orcid: 0009-0007-5598-9484
- first_name: Leander
  full_name: Claes, Leander
  id: '11829'
  last_name: Claes
  orcid: 0000-0002-4393-268X
- first_name: Jonas
  full_name: Hölscher, Jonas
  id: '73952'
  last_name: Hölscher
- first_name: Bernd
  full_name: Henning, Bernd
  id: '213'
  last_name: Henning
- first_name: Claus
  full_name: Scheidemann, Claus
  id: '38259'
  last_name: Scheidemann
- first_name: Tobias
  full_name: Hemsel, Tobias
  id: '210'
  last_name: Hemsel
- first_name: Raphael
  full_name: Kuess, Raphael
  last_name: Kuess
- first_name: Andrea
  full_name: Walther, Andrea
  last_name: Walther
- first_name: Carsten
  full_name: Spieker, Carsten
  id: '67587'
  last_name: Spieker
- first_name: Jens
  full_name: Förstner, Jens
  id: '158'
  last_name: Förstner
  orcid: 0000-0001-7059-9862
citation:
  ama: Friesen O, Claes L, Hölscher J, et al. Measurement of multiphysical material
    parameters of piezoceramic components for high-power ultrasonic applications.
    <i>tm - Technisches Messen</i>. Published online 2026. doi:<a href="https://doi.org/10.1515/teme-2026-0042">10.1515/teme-2026-0042</a>
  apa: Friesen, O., Claes, L., Hölscher, J., Henning, B., Scheidemann, C., Hemsel,
    T., Kuess, R., Walther, A., Spieker, C., &#38; Förstner, J. (2026). Measurement
    of multiphysical material parameters of piezoceramic components for high-power
    ultrasonic applications. <i>Tm - Technisches Messen</i>. <a href="https://doi.org/10.1515/teme-2026-0042">https://doi.org/10.1515/teme-2026-0042</a>
  bibtex: '@article{Friesen_Claes_Hölscher_Henning_Scheidemann_Hemsel_Kuess_Walther_Spieker_Förstner_2026,
    title={Measurement of multiphysical material parameters of piezoceramic components
    for high-power ultrasonic applications}, DOI={<a href="https://doi.org/10.1515/teme-2026-0042">10.1515/teme-2026-0042</a>},
    journal={tm - Technisches Messen}, publisher={Walter de Gruyter GmbH}, author={Friesen,
    Olga and Claes, Leander and Hölscher, Jonas and Henning, Bernd and Scheidemann,
    Claus and Hemsel, Tobias and Kuess, Raphael and Walther, Andrea and Spieker, Carsten
    and Förstner, Jens}, year={2026} }'
  chicago: Friesen, Olga, Leander Claes, Jonas Hölscher, Bernd Henning, Claus Scheidemann,
    Tobias Hemsel, Raphael Kuess, Andrea Walther, Carsten Spieker, and Jens Förstner.
    “Measurement of Multiphysical Material Parameters of Piezoceramic Components for High-Power
    Ultrasonic Applications.” <i>Tm - Technisches Messen</i>, 2026. <a href="https://doi.org/10.1515/teme-2026-0042">https://doi.org/10.1515/teme-2026-0042</a>.
  ieee: 'O. Friesen <i>et al.</i>, “Measurement of multiphysical material parameters
    of piezoceramic components for high-power ultrasonic applications,” <i>tm - Technisches
    Messen</i>, 2026, doi: <a href="https://doi.org/10.1515/teme-2026-0042">10.1515/teme-2026-0042</a>.'
  mla: Friesen, Olga, et al. “Measurement of Multiphysical Material Parameters of Piezoceramic
    Components for High-Power Ultrasonic Applications.” <i>Tm - Technisches Messen</i>,
    Walter de Gruyter GmbH, 2026, doi:<a href="https://doi.org/10.1515/teme-2026-0042">10.1515/teme-2026-0042</a>.
  short: O. Friesen, L. Claes, J. Hölscher, B. Henning, C. Scheidemann, T. Hemsel,
    R. Kuess, A. Walther, C. Spieker, J. Förstner, Tm - Technisches Messen (2026).
date_created: 2026-06-08T05:44:09Z
date_updated: 2026-06-08T17:54:45Z
department:
- _id: '49'
doi: 10.1515/teme-2026-0042
keyword:
- tet_topic_piezo
language:
- iso: eng
main_file_link:
- open_access: '1'
oa: '1'
project:
- _id: '245'
  name: 'FOR 5208: Modellbasierte Bestimmung nichtlinearer Eigenschaften von Piezokeramiken
    für Leistungsschallanwendungen (NEPTUN)'
publication: tm - Technisches Messen
publication_identifier:
  issn:
  - 0171-8096
  - 2196-7113
publication_status: published
publisher: Walter de Gruyter GmbH
status: public
title: Measurement of multiphysical material parameters of piezoceramic components
  for high-power ultrasonic applications
type: journal_article
user_id: '158'
year: '2026'
...
---
_id: '65588'
author:
- first_name: Carsten
  full_name: Spieker, Carsten
  id: '67587'
  last_name: Spieker
- first_name: Raphael
  full_name: Kuess, Raphael
  last_name: Kuess
- first_name: Andrea
  full_name: Walther, Andrea
  last_name: Walther
- first_name: Jens
  full_name: Förstner, Jens
  id: '158'
  last_name: Förstner
  orcid: 0000-0001-7059-9862
citation:
  ama: 'Spieker C, Kuess R, Walther A, Förstner J. Modellierung und Simulation des
    temperaturabhängigen Materialverhaltens von Piezokeramiken mit FEniCS. In: Deutsche
    Gesellschaft für Akustik e.V., ed. <i>Fortschritte Der Akustik - DAGA 2026</i>.
    ; 2026:1066–1069. doi:<a href="https://doi.org/10.71568/DAGA2026.549">10.71568/DAGA2026.549</a>'
  apa: Spieker, C., Kuess, R., Walther, A., &#38; Förstner, J. (2026). Modellierung
    und Simulation des temperaturabhängigen Materialverhaltens von Piezokeramiken
    mit FEniCS. In Deutsche Gesellschaft für Akustik e.V. (Ed.), <i>Fortschritte der
    Akustik - DAGA 2026</i> (pp. 1066–1069). <a href="https://doi.org/10.71568/DAGA2026.549">https://doi.org/10.71568/DAGA2026.549</a>
  bibtex: '@inproceedings{Spieker_Kuess_Walther_Förstner_2026, title={Modellierung
    und Simulation des temperaturabhängigen Materialverhaltens von Piezokeramiken
    mit FEniCS}, DOI={<a href="https://doi.org/10.71568/DAGA2026.549">10.71568/DAGA2026.549</a>},
    booktitle={Fortschritte der Akustik - DAGA 2026}, author={Spieker, Carsten and
    Kuess, Raphael and Walther, Andrea and Förstner, Jens}, editor={Deutsche Gesellschaft
    für Akustik e.V.}, year={2026}, pages={1066–1069} }'
  chicago: Spieker, Carsten, Raphael Kuess, Andrea Walther, and Jens Förstner. “Modellierung
    Und Simulation Des Temperaturabhängigen Materialverhaltens von Piezokeramiken
    Mit FEniCS.” In <i>Fortschritte Der Akustik - DAGA 2026</i>, edited by Deutsche
    Gesellschaft für Akustik e.V., 1066–1069, 2026. <a href="https://doi.org/10.71568/DAGA2026.549">https://doi.org/10.71568/DAGA2026.549</a>.
  ieee: 'C. Spieker, R. Kuess, A. Walther, and J. Förstner, “Modellierung und Simulation
    des temperaturabhängigen Materialverhaltens von Piezokeramiken mit FEniCS,” in
    <i>Fortschritte der Akustik - DAGA 2026</i>, 2026, pp. 1066–1069, doi: <a href="https://doi.org/10.71568/DAGA2026.549">10.71568/DAGA2026.549</a>.'
  mla: Spieker, Carsten, et al. “Modellierung Und Simulation Des Temperaturabhängigen
    Materialverhaltens von Piezokeramiken Mit FEniCS.” <i>Fortschritte Der Akustik
    - DAGA 2026</i>, edited by Deutsche Gesellschaft für Akustik e.V., 2026, pp. 1066–1069,
    doi:<a href="https://doi.org/10.71568/DAGA2026.549">10.71568/DAGA2026.549</a>.
  short: 'C. Spieker, R. Kuess, A. Walther, J. Förstner, in: Deutsche Gesellschaft
    für Akustik e.V. (Ed.), Fortschritte Der Akustik - DAGA 2026, 2026, pp. 1066–1069.'
corporate_editor:
- Deutsche Gesellschaft für Akustik e.V.
date_created: 2026-05-08T12:37:35Z
date_updated: 2026-06-08T17:55:18Z
department:
- _id: '61'
doi: 10.71568/DAGA2026.549
keyword:
- tet_topic_piezo
language:
- iso: eng
page: 1066–1069
project:
- _id: '245'
  name: 'FOR 5208: Modellbasierte Bestimmung nichtlinearer Eigenschaften von Piezokeramiken
    für Leistungsschallanwendungen (NEPTUN)'
publication: Fortschritte der Akustik - DAGA 2026
status: public
title: Modellierung und Simulation des temperaturabhängigen Materialverhaltens von
  Piezokeramiken mit FEniCS
type: conference
user_id: '158'
year: '2026'
...
---
_id: '65825'
author:
- first_name: Dominik
  full_name: Kürpick, Dominik
  last_name: Kürpick
- first_name: Aschot
  full_name: Hovemann, Aschot
  last_name: Hovemann
- first_name: Christian
  full_name: Kürpick, Christian
  last_name: Kürpick
- first_name: Stefan
  full_name: Gabriel, Stefan
  last_name: Gabriel
- first_name: Jonas
  full_name: Lick, Jonas
  last_name: Lick
- first_name: Roman
  full_name: Dumitrescu, Roman
  id: '16190'
  last_name: Dumitrescu
citation:
  ama: 'Kürpick D, Hovemann A, Kürpick C, Gabriel S, Lick J, Dumitrescu R. AI-Based
    Enterprise Architecture Management in Engineering Domain: A Systematic Literature
    Review. In: <i>2025 International Conference on Intelligent &#38;amp;Amp; Innovative
    Practices in Engineering &#38;amp;Amp; Management (IIPEM)</i>. IEEE; 2026. doi:<a
    href="https://doi.org/10.1109/iipem65914.2025.11548261">10.1109/iipem65914.2025.11548261</a>'
  apa: 'Kürpick, D., Hovemann, A., Kürpick, C., Gabriel, S., Lick, J., &#38; Dumitrescu,
    R. (2026). AI-Based Enterprise Architecture Management in Engineering Domain:
    A Systematic Literature Review. <i>2025 International Conference on Intelligent
    &#38;amp;Amp; Innovative Practices in Engineering &#38;amp;Amp; Management (IIPEM)</i>.
    <a href="https://doi.org/10.1109/iipem65914.2025.11548261">https://doi.org/10.1109/iipem65914.2025.11548261</a>'
  bibtex: '@inproceedings{Kürpick_Hovemann_Kürpick_Gabriel_Lick_Dumitrescu_2026, title={AI-Based
    Enterprise Architecture Management in Engineering Domain: A Systematic Literature
    Review}, DOI={<a href="https://doi.org/10.1109/iipem65914.2025.11548261">10.1109/iipem65914.2025.11548261</a>},
    booktitle={2025 International Conference on Intelligent &#38;amp;amp; Innovative
    Practices in Engineering &#38;amp;amp; Management (IIPEM)}, publisher={IEEE},
    author={Kürpick, Dominik and Hovemann, Aschot and Kürpick, Christian and Gabriel,
    Stefan and Lick, Jonas and Dumitrescu, Roman}, year={2026} }'
  chicago: 'Kürpick, Dominik, Aschot Hovemann, Christian Kürpick, Stefan Gabriel,
    Jonas Lick, and Roman Dumitrescu. “AI-Based Enterprise Architecture Management
    in Engineering Domain: A Systematic Literature Review.” In <i>2025 International
    Conference on Intelligent &#38;amp;Amp; Innovative Practices in Engineering &#38;amp;Amp;
    Management (IIPEM)</i>. IEEE, 2026. <a href="https://doi.org/10.1109/iipem65914.2025.11548261">https://doi.org/10.1109/iipem65914.2025.11548261</a>.'
  ieee: 'D. Kürpick, A. Hovemann, C. Kürpick, S. Gabriel, J. Lick, and R. Dumitrescu,
    “AI-Based Enterprise Architecture Management in Engineering Domain: A Systematic
    Literature Review,” 2026, doi: <a href="https://doi.org/10.1109/iipem65914.2025.11548261">10.1109/iipem65914.2025.11548261</a>.'
  mla: 'Kürpick, Dominik, et al. “AI-Based Enterprise Architecture Management in Engineering
    Domain: A Systematic Literature Review.” <i>2025 International Conference on Intelligent
    &#38;amp;Amp; Innovative Practices in Engineering &#38;amp;Amp; Management (IIPEM)</i>,
    IEEE, 2026, doi:<a href="https://doi.org/10.1109/iipem65914.2025.11548261">10.1109/iipem65914.2025.11548261</a>.'
  short: 'D. Kürpick, A. Hovemann, C. Kürpick, S. Gabriel, J. Lick, R. Dumitrescu,
    in: 2025 International Conference on Intelligent &#38;amp;Amp; Innovative Practices
    in Engineering &#38;amp;Amp; Management (IIPEM), IEEE, 2026.'
date_created: 2026-06-10T08:23:43Z
date_updated: 2026-06-10T08:24:19Z
department:
- _id: '563'
doi: 10.1109/iipem65914.2025.11548261
language:
- iso: eng
publication: 2025 International Conference on Intelligent &amp;amp; Innovative Practices
  in Engineering &amp;amp; Management (IIPEM)
publication_status: published
publisher: IEEE
status: public
title: 'AI-Based Enterprise Architecture Management in Engineering Domain: A Systematic
  Literature Review'
type: conference
user_id: '15782'
year: '2026'
...
---
_id: '65835'
author:
- first_name: Christian
  full_name: Koldewey, Christian
  id: '43136'
  last_name: Koldewey
  orcid: https://orcid.org/0000-0001-7992-6399
- first_name: Celina Maleen
  full_name: Avermeyer, Celina Maleen
  id: '84783'
  last_name: Avermeyer
- first_name: Hendrik
  full_name: van der Valk, Hendrik
  last_name: van der Valk
- first_name: Julian
  full_name: Zerbin, Julian
  id: '51711'
  last_name: Zerbin
- first_name: Roman
  full_name: Dumitrescu, Roman
  id: '16190'
  last_name: Dumitrescu
citation:
  ama: 'Koldewey C, Avermeyer CM, van der Valk H, Zerbin J, Dumitrescu R. Fundamental
    Patterns – A Taxonomy for Archetype Development in Information Systems. In: <i>Lecture
    Notes in Computer Science</i>. Springer Nature Switzerland; 2026. doi:<a href="https://doi.org/10.1007/978-3-032-28313-9_18">10.1007/978-3-032-28313-9_18</a>'
  apa: Koldewey, C., Avermeyer, C. M., van der Valk, H., Zerbin, J., &#38; Dumitrescu,
    R. (2026). Fundamental Patterns – A Taxonomy for Archetype Development in Information
    Systems. In <i>Lecture Notes in Computer Science</i>. Springer Nature Switzerland.
    <a href="https://doi.org/10.1007/978-3-032-28313-9_18">https://doi.org/10.1007/978-3-032-28313-9_18</a>
  bibtex: '@inbook{Koldewey_Avermeyer_van der Valk_Zerbin_Dumitrescu_2026, place={Cham},
    title={Fundamental Patterns – A Taxonomy for Archetype Development in Information
    Systems}, DOI={<a href="https://doi.org/10.1007/978-3-032-28313-9_18">10.1007/978-3-032-28313-9_18</a>},
    booktitle={Lecture Notes in Computer Science}, publisher={Springer Nature Switzerland},
    author={Koldewey, Christian and Avermeyer, Celina Maleen and van der Valk, Hendrik
    and Zerbin, Julian and Dumitrescu, Roman}, year={2026} }'
  chicago: 'Koldewey, Christian, Celina Maleen Avermeyer, Hendrik van der Valk, Julian
    Zerbin, and Roman Dumitrescu. “Fundamental Patterns – A Taxonomy for Archetype
    Development in Information Systems.” In <i>Lecture Notes in Computer Science</i>.
    Cham: Springer Nature Switzerland, 2026. <a href="https://doi.org/10.1007/978-3-032-28313-9_18">https://doi.org/10.1007/978-3-032-28313-9_18</a>.'
  ieee: 'C. Koldewey, C. M. Avermeyer, H. van der Valk, J. Zerbin, and R. Dumitrescu,
    “Fundamental Patterns – A Taxonomy for Archetype Development in Information Systems,”
    in <i>Lecture Notes in Computer Science</i>, Cham: Springer Nature Switzerland,
    2026.'
  mla: Koldewey, Christian, et al. “Fundamental Patterns – A Taxonomy for Archetype
    Development in Information Systems.” <i>Lecture Notes in Computer Science</i>,
    Springer Nature Switzerland, 2026, doi:<a href="https://doi.org/10.1007/978-3-032-28313-9_18">10.1007/978-3-032-28313-9_18</a>.
  short: 'C. Koldewey, C.M. Avermeyer, H. van der Valk, J. Zerbin, R. Dumitrescu,
    in: Lecture Notes in Computer Science, Springer Nature Switzerland, Cham, 2026.'
date_created: 2026-06-11T11:25:01Z
date_updated: 2026-06-11T11:25:49Z
department:
- _id: '563'
doi: 10.1007/978-3-032-28313-9_18
language:
- iso: eng
place: Cham
publication: Lecture Notes in Computer Science
publication_identifier:
  isbn:
  - '9783032283122'
  - '9783032283139'
  issn:
  - 0302-9743
  - 1611-3349
publication_status: published
publisher: Springer Nature Switzerland
status: public
title: Fundamental Patterns – A Taxonomy for Archetype Development in Information
  Systems
type: book_chapter
user_id: '15782'
year: '2026'
...
---
_id: '65834'
author:
- first_name: Lynn
  full_name: Humpert, Lynn
  last_name: Humpert
- first_name: Jan-Philipp
  full_name: Disselkamp, Jan-Philipp
  last_name: Disselkamp
- first_name: Gerrit
  full_name: Cichon, Gerrit
  last_name: Cichon
- first_name: Harald
  full_name: Anacker, Harald
  last_name: Anacker
- first_name: Roman
  full_name: Dumitrescu, Roman
  id: '16190'
  last_name: Dumitrescu
citation:
  ama: Humpert L, Disselkamp J-P, Cichon G, Anacker H, Dumitrescu R. Systematic Approach
    to Early Validation Based on the System Architecture of Advanced Systems in the
    B2B Sector. <i>IEEE Engineering Management Review</i>. Published online 2026:1-22.
    doi:<a href="https://doi.org/10.1109/emr.2026.3700482">10.1109/emr.2026.3700482</a>
  apa: Humpert, L., Disselkamp, J.-P., Cichon, G., Anacker, H., &#38; Dumitrescu,
    R. (2026). Systematic Approach to Early Validation Based on the System Architecture
    of Advanced Systems in the B2B Sector. <i>IEEE Engineering Management Review</i>,
    1–22. <a href="https://doi.org/10.1109/emr.2026.3700482">https://doi.org/10.1109/emr.2026.3700482</a>
  bibtex: '@article{Humpert_Disselkamp_Cichon_Anacker_Dumitrescu_2026, title={Systematic
    Approach to Early Validation Based on the System Architecture of Advanced Systems
    in the B2B Sector}, DOI={<a href="https://doi.org/10.1109/emr.2026.3700482">10.1109/emr.2026.3700482</a>},
    journal={IEEE Engineering Management Review}, publisher={Institute of Electrical
    and Electronics Engineers (IEEE)}, author={Humpert, Lynn and Disselkamp, Jan-Philipp
    and Cichon, Gerrit and Anacker, Harald and Dumitrescu, Roman}, year={2026}, pages={1–22}
    }'
  chicago: Humpert, Lynn, Jan-Philipp Disselkamp, Gerrit Cichon, Harald Anacker, and
    Roman Dumitrescu. “Systematic Approach to Early Validation Based on the System
    Architecture of Advanced Systems in the B2B Sector.” <i>IEEE Engineering Management
    Review</i>, 2026, 1–22. <a href="https://doi.org/10.1109/emr.2026.3700482">https://doi.org/10.1109/emr.2026.3700482</a>.
  ieee: 'L. Humpert, J.-P. Disselkamp, G. Cichon, H. Anacker, and R. Dumitrescu, “Systematic
    Approach to Early Validation Based on the System Architecture of Advanced Systems
    in the B2B Sector,” <i>IEEE Engineering Management Review</i>, pp. 1–22, 2026,
    doi: <a href="https://doi.org/10.1109/emr.2026.3700482">10.1109/emr.2026.3700482</a>.'
  mla: Humpert, Lynn, et al. “Systematic Approach to Early Validation Based on the
    System Architecture of Advanced Systems in the B2B Sector.” <i>IEEE Engineering
    Management Review</i>, Institute of Electrical and Electronics Engineers (IEEE),
    2026, pp. 1–22, doi:<a href="https://doi.org/10.1109/emr.2026.3700482">10.1109/emr.2026.3700482</a>.
  short: L. Humpert, J.-P. Disselkamp, G. Cichon, H. Anacker, R. Dumitrescu, IEEE
    Engineering Management Review (2026) 1–22.
date_created: 2026-06-11T11:22:47Z
date_updated: 2026-06-11T11:25:51Z
department:
- _id: '563'
doi: 10.1109/emr.2026.3700482
language:
- iso: eng
page: 1-22
publication: IEEE Engineering Management Review
publication_identifier:
  issn:
  - 0360-8581
  - 1937-4178
publication_status: published
publisher: Institute of Electrical and Electronics Engineers (IEEE)
status: public
title: Systematic Approach to Early Validation Based on the System Architecture of
  Advanced Systems in the B2B Sector
type: journal_article
user_id: '15782'
year: '2026'
...
