---
_id: '63800'
abstract:
- lang: eng
  text: In this contribution, we address the estimation of the frequency-dependent
    elastic parameters of polymers in the ultrasound range, which is formulated as
    an inverse problem. This inverse problem is implemented as a nonlinear regression-type
    optimization problem, in which the simulation signals are fitted to the measurement
    signals. These signals consist of displacement responses in waveguides, focusing
    on hollow cylindrical geometries to enhance the simulation efficiency. To accelerate
    the optimization and reduce the number of model evaluations and wait times, we
    propose two novel methods. First, we introduce an adaptation of the Levenberg–Marquardt
    method derived from a geometrical interpretation of the least-squares optimization
    problem. Second, we introduce an improved objective function based on the autocorrelated
    envelopes of the measurement and simulation signals. Given that this study primarily
    relies on simulation data to quantify optimization convergence, we aggregate the
    expected ranges of realistic material parameters and derive their distributions
    to ensure the reproducibility of optimizations with proper measurements. We demonstrate
    the effectiveness of our objective function modification and step adaptation for
    various materials with isotropic material symmetry by comparing them with the
    Broyden–Fletcher–Goldfarb–Shanno method. In all cases, our method reduces the
    total number of model evaluations, thereby shortening the time to identify the
    material parameters.
author:
- first_name: Dominik
  full_name: Itner, Dominik
  last_name: Itner
- first_name: Dmitrij
  full_name: Dreiling, Dmitrij
  id: '32616'
  last_name: Dreiling
- first_name: Hauke
  full_name: Gravenkamp, Hauke
  last_name: Gravenkamp
- first_name: Bernd
  full_name: Henning, Bernd
  id: '213'
  last_name: Henning
- first_name: Carolin
  full_name: Birk, Carolin
  last_name: Birk
citation:
  ama: Itner D, Dreiling D, Gravenkamp H, Henning B, Birk C. A modified Levenberg–Marquardt
    method for estimating the elastic material parameters of polymer waveguides using
    residuals between autocorrelated frequency responses. <i>Mechanical Systems and
    Signal Processing</i>. 2026;247:113904. doi:<a href="https://doi.org/10.1016/j.ymssp.2026.113904">https://doi.org/10.1016/j.ymssp.2026.113904</a>
  apa: Itner, D., Dreiling, D., Gravenkamp, H., Henning, B., &#38; Birk, C. (2026).
    A modified Levenberg–Marquardt method for estimating the elastic material parameters
    of polymer waveguides using residuals between autocorrelated frequency responses.
    <i>Mechanical Systems and Signal Processing</i>, <i>247</i>, 113904. <a href="https://doi.org/10.1016/j.ymssp.2026.113904">https://doi.org/10.1016/j.ymssp.2026.113904</a>
  bibtex: '@article{Itner_Dreiling_Gravenkamp_Henning_Birk_2026, title={A modified
    Levenberg–Marquardt method for estimating the elastic material parameters of polymer
    waveguides using residuals between autocorrelated frequency responses}, volume={247},
    DOI={<a href="https://doi.org/10.1016/j.ymssp.2026.113904">https://doi.org/10.1016/j.ymssp.2026.113904</a>},
    journal={Mechanical Systems and Signal Processing}, author={Itner, Dominik and
    Dreiling, Dmitrij and Gravenkamp, Hauke and Henning, Bernd and Birk, Carolin},
    year={2026}, pages={113904} }'
  chicago: 'Itner, Dominik, Dmitrij Dreiling, Hauke Gravenkamp, Bernd Henning, and
    Carolin Birk. “A Modified Levenberg–Marquardt Method for Estimating the Elastic
    Material Parameters of Polymer Waveguides Using Residuals between Autocorrelated
    Frequency Responses.” <i>Mechanical Systems and Signal Processing</i> 247 (2026):
    113904. <a href="https://doi.org/10.1016/j.ymssp.2026.113904">https://doi.org/10.1016/j.ymssp.2026.113904</a>.'
  ieee: 'D. Itner, D. Dreiling, H. Gravenkamp, B. Henning, and C. Birk, “A modified
    Levenberg–Marquardt method for estimating the elastic material parameters of polymer
    waveguides using residuals between autocorrelated frequency responses,” <i>Mechanical
    Systems and Signal Processing</i>, vol. 247, p. 113904, 2026, doi: <a href="https://doi.org/10.1016/j.ymssp.2026.113904">https://doi.org/10.1016/j.ymssp.2026.113904</a>.'
  mla: Itner, Dominik, et al. “A Modified Levenberg–Marquardt Method for Estimating
    the Elastic Material Parameters of Polymer Waveguides Using Residuals between
    Autocorrelated Frequency Responses.” <i>Mechanical Systems and Signal Processing</i>,
    vol. 247, 2026, p. 113904, doi:<a href="https://doi.org/10.1016/j.ymssp.2026.113904">https://doi.org/10.1016/j.ymssp.2026.113904</a>.
  short: D. Itner, D. Dreiling, H. Gravenkamp, B. Henning, C. Birk, Mechanical Systems
    and Signal Processing 247 (2026) 113904.
date_created: 2026-01-29T08:53:42Z
date_updated: 2026-02-02T12:44:47Z
department:
- _id: '49'
doi: https://doi.org/10.1016/j.ymssp.2026.113904
intvolume: '       247'
keyword:
- Material parameter estimation
- Waveguide
- Nonlinear optimization
- Inverse problem
- Least squares
language:
- iso: eng
main_file_link:
- open_access: '1'
  url: https://www.sciencedirect.com/science/article/pii/S0888327026000610/pdfft?md5=16e8493b44527f4ab0a6d13f634a01c3&pid=1-s2.0-S0888327026000610-main.pdf
oa: '1'
page: '113904'
project:
- _id: '89'
  name: Vollständige Bestimmung der akustischen Materialparameter von Polymeren
publication: Mechanical Systems and Signal Processing
publication_identifier:
  issn:
  - 0888-3270
publication_status: published
status: public
title: A modified Levenberg–Marquardt method for estimating the elastic material parameters
  of polymer waveguides using residuals between autocorrelated frequency responses
type: journal_article
user_id: '32616'
volume: 247
year: '2026'
...
---
_id: '56815'
abstract:
- lang: eng
  text: This study investigates the determinants of tax complexity in Indonesia, focusing
    on the perspectives of tax officers and firms, and thus provides a case study
    relevant to developing countries. Understanding tax complexity in this context
    is crucial as developing nations frequently encounter legislative, fiscal, and
    administrative challenges that exacerbate their tax complexity. Complexity can
    hinder investment, impair tax revenue collection, and impede economic development.
    The authors adapt a global survey instrument to the Indonesian context and collect
    responses from Indonesian tax officers and firms. Transfer pricing is perceived
    as the most complex tax regulation which is consistent with cross-country studies.
    However, in contrast to the global findings, statutory tax rates and taxes on
    dividends rank second and third in Indonesia. While Indonesian tax officers emphasize
    the complexity of transfer pricing regulations, firms are more concerned about
    the complexity of tax procedures, especially tax guidance and tax audits. Furthermore,
    comparative analyses show that tax officers perceive tax regulations as being
    more complex than tax procedures. In contrast, firms perceive the opposite, particularly
    for tax audits. The findings offer a nuanced picture of tax complexity in a developing
    country and provide guidance for tax reforms in Indonesia. They also serve as
    a commencement for further analyses of developing countries.
author:
- first_name: Adrian
  full_name: Schipp, Adrian
  id: '44288'
  last_name: Schipp
- first_name: Fernando
  full_name: Siahaan, Fernando
  last_name: Siahaan
- first_name: Caren
  full_name: Sureth-Sloane, Caren
  id: '530'
  last_name: Sureth-Sloane
  orcid: ' 0000-0002-8183-5901'
citation:
  ama: 'Schipp A, Siahaan F, Sureth-Sloane C. Determinants of Tax Complexity: Evidence
    from a Developing Country. <i>Intertax</i>. 2026;54(2):102-122. doi:<a href="http://dx.doi.org/10.2139/ssrn.4924632">http://dx.doi.org/10.2139/ssrn.4924632</a>'
  apa: 'Schipp, A., Siahaan, F., &#38; Sureth-Sloane, C. (2026). Determinants of Tax
    Complexity: Evidence from a Developing Country. <i>Intertax</i>, <i>54</i>(2),
    102–122. <a href="http://dx.doi.org/10.2139/ssrn.4924632">http://dx.doi.org/10.2139/ssrn.4924632</a>'
  bibtex: '@article{Schipp_Siahaan_Sureth-Sloane_2026, title={Determinants of Tax
    Complexity: Evidence from a Developing Country}, volume={54}, DOI={<a href="http://dx.doi.org/10.2139/ssrn.4924632">http://dx.doi.org/10.2139/ssrn.4924632</a>},
    number={2}, journal={Intertax}, author={Schipp, Adrian and Siahaan, Fernando and
    Sureth-Sloane, Caren}, year={2026}, pages={102–122} }'
  chicago: 'Schipp, Adrian, Fernando Siahaan, and Caren Sureth-Sloane. “Determinants
    of Tax Complexity: Evidence from a Developing Country.” <i>Intertax</i> 54, no.
    2 (2026): 102–22. <a href="http://dx.doi.org/10.2139/ssrn.4924632">http://dx.doi.org/10.2139/ssrn.4924632</a>.'
  ieee: 'A. Schipp, F. Siahaan, and C. Sureth-Sloane, “Determinants of Tax Complexity:
    Evidence from a Developing Country,” <i>Intertax</i>, vol. 54, no. 2, pp. 102–122,
    2026, doi: <a href="http://dx.doi.org/10.2139/ssrn.4924632">http://dx.doi.org/10.2139/ssrn.4924632</a>.'
  mla: 'Schipp, Adrian, et al. “Determinants of Tax Complexity: Evidence from a Developing
    Country.” <i>Intertax</i>, vol. 54, no. 2, 2026, pp. 102–22, doi:<a href="http://dx.doi.org/10.2139/ssrn.4924632">http://dx.doi.org/10.2139/ssrn.4924632</a>.'
  short: A. Schipp, F. Siahaan, C. Sureth-Sloane, Intertax 54 (2026) 102–122.
date_created: 2024-10-30T07:25:39Z
date_updated: 2026-02-02T13:09:32Z
department:
- _id: '187'
doi: http://dx.doi.org/10.2139/ssrn.4924632
intvolume: '        54'
issue: '2'
language:
- iso: eng
main_file_link:
- url: https://kluwerlawonline.com/journalarticle/Intertax/54.2/TAXI2026020
page: 102-122
publication: Intertax
publication_status: published
status: public
title: 'Determinants of Tax Complexity: Evidence from a Developing Country'
type: journal_article
user_id: '97894'
volume: 54
year: '2026'
...
---
_id: '63827'
abstract:
- lang: eng
  text: Light-emitting diodes (LEDs) are becoming increasingly important across various
    sectors of the lighting industry and are being used more frequently. In the field
    of symbolic projection, research is increasingly focusing on implementing light
    modulation using energy-efficient, incoherent LEDs rather than lasers. Since light
    modulation in micro- and nano-optics is typically achieved through phase modulation,
    Finite-Difference Time-Domain (FDTD) simulations are employed for analysis. The
    objective of this article is to investigate different approaches for approximating
    incoherent monochromatic light sources within FDTD simulations. To this end, two
    approaches based on dipole sources are considered, as well as a method involving
    plane waves with modulated wavefronts based on Cosine–Fourier functions and a
    method based on the superposition of Gaussian beams. These methods are evaluated
    in terms of their accuracy using a two-dimensional double-slit configuration and
    are compared against a fully incoherent analytical reference.
article_number: '128'
article_type: original
author:
- first_name: Dominik
  full_name: Metzner, Dominik
  last_name: Metzner
- first_name: Jens
  full_name: Potthoff, Jens
  last_name: Potthoff
- first_name: Thomas
  full_name: Zentgraf, Thomas
  id: '30525'
  last_name: Zentgraf
  orcid: 0000-0002-8662-1101
- first_name: Jens
  full_name: Förstner, Jens
  id: '158'
  last_name: Förstner
  orcid: 0000-0001-7059-9862
citation:
  ama: Metzner D, Potthoff J, Zentgraf T, Förstner J. Approximating Incoherent Monochromatic
    Light Sources in FDTD Simulations. <i>Photonics</i>. 2026;13(2). doi:<a href="https://doi.org/10.3390/photonics13020128">10.3390/photonics13020128</a>
  apa: Metzner, D., Potthoff, J., Zentgraf, T., &#38; Förstner, J. (2026). Approximating
    Incoherent Monochromatic Light Sources in FDTD Simulations. <i>Photonics</i>,
    <i>13</i>(2), Article 128. <a href="https://doi.org/10.3390/photonics13020128">https://doi.org/10.3390/photonics13020128</a>
  bibtex: '@article{Metzner_Potthoff_Zentgraf_Förstner_2026, title={Approximating
    Incoherent Monochromatic Light Sources in FDTD Simulations}, volume={13}, DOI={<a
    href="https://doi.org/10.3390/photonics13020128">10.3390/photonics13020128</a>},
    number={2128}, journal={Photonics}, publisher={MDPI AG}, author={Metzner, Dominik
    and Potthoff, Jens and Zentgraf, Thomas and Förstner, Jens}, year={2026} }'
  chicago: Metzner, Dominik, Jens Potthoff, Thomas Zentgraf, and Jens Förstner. “Approximating
    Incoherent Monochromatic Light Sources in FDTD Simulations.” <i>Photonics</i>
    13, no. 2 (2026). <a href="https://doi.org/10.3390/photonics13020128">https://doi.org/10.3390/photonics13020128</a>.
  ieee: 'D. Metzner, J. Potthoff, T. Zentgraf, and J. Förstner, “Approximating Incoherent
    Monochromatic Light Sources in FDTD Simulations,” <i>Photonics</i>, vol. 13, no.
    2, Art. no. 128, 2026, doi: <a href="https://doi.org/10.3390/photonics13020128">10.3390/photonics13020128</a>.'
  mla: Metzner, Dominik, et al. “Approximating Incoherent Monochromatic Light Sources
    in FDTD Simulations.” <i>Photonics</i>, vol. 13, no. 2, 128, MDPI AG, 2026, doi:<a
    href="https://doi.org/10.3390/photonics13020128">10.3390/photonics13020128</a>.
  short: D. Metzner, J. Potthoff, T. Zentgraf, J. Förstner, Photonics 13 (2026).
date_created: 2026-02-02T07:18:03Z
date_updated: 2026-02-02T21:38:34Z
department:
- _id: '15'
- _id: '230'
- _id: '289'
- _id: '623'
- _id: '61'
doi: 10.3390/photonics13020128
intvolume: '        13'
issue: '2'
keyword:
- tet_topic_opticalantenna
- tet_topic_numerics
- tet_topic_meta
language:
- iso: eng
main_file_link:
- open_access: '1'
  url: https://www.mdpi.com/2304-6732/13/2/128
oa: '1'
publication: Photonics
publication_identifier:
  issn:
  - 2304-6732
publication_status: published
publisher: MDPI AG
quality_controlled: '1'
status: public
title: Approximating Incoherent Monochromatic Light Sources in FDTD Simulations
type: journal_article
user_id: '158'
volume: 13
year: '2026'
...
---
_id: '61463'
abstract:
- lang: ger
  text: Vernetztes Wissen ist ein zentrales Lernziel des Hochschulstudiums, insbesondere
    im interdisziplinär angelegten Studienfach Komparatistik. Um den Aufbau vernetzten
    Wissens bei Bachelorstudierenden der Komparatistik zu unterstützen, ist in diesem
    Projekt Portfolioarbeit eingesetzt worden, die als Methode selbsttätigen und selbstreflexiven
    Lernens geeignet erscheint, zur Auseinandersetzung mit Lerninhalten zu motivieren
    und zur Kompetenzentwicklung der Studierenden beizutragen. Mittels unstrukturierter
    Beobachtungen der Portfolioarbeit im Seminar sind inhaltliche Effekte und methodische
    Entwicklungen erfasst worden. Anhand anteilig quantitativer, überwiegend qualitativer
    Inhaltsanalysen der Portfolios sind konkrete Vernetzungen zwischen Lerninhalten
    ermittelt worden. Die Explorationsstudie zeigt veränderte Perspektiven und geweckte
    Interessen bei den Studierenden durch die Portfolioarbeit sowie vielfältige Kontextualisierungen,
    Vergleiche und Verknüpfungen in den Portfolios auf und bietet hierdurch einen
    möglichen Ansatzpunkt für strukturelle Empfehlungen für das Studienfach Komparatistik.
- lang: eng
  text: Knowledge networks are a central learning objective in higher education, especially
    in the inherently interdisciplinary discipline of comparative literary and cultural
    studies. To support the development of knowledge networks with undergraduate students
    of comparative literary and cultural studies, this project utilized portfolio
    work as a method of self-actuating and self-reflective learning suitable for motivating
    examinations of learning contents and contributing to students’ skill development.
    Using naturalistic observations of the portfolio work within the seminar, effects
    and developments were recorded. With partly quantitative, predominantly qualitative
    content analyses of the portfolios, concrete connections between learning contents
    were determined. The explorative study shows changed perspectives and peaked interests
    of the students because of portfolio work as well as diverse contextualisations,
    comparisons and connections in the portfolios, thus offering a possible starting
    point for structural recommendations for the discipline of comparative literary
    and cultural studies.
article_type: original
author:
- first_name: Ronja
  full_name: Hannebohm, Ronja
  id: '27419'
  last_name: Hannebohm
citation:
  ama: 'Hannebohm R. Potenziale der Portfolioarbeit für den Aufbau vernetzten Wissens
    im Bachelorstudium: Eine Explorationsstudie im Studienfach Komparatistik/Vergleichende
    Literatur- und Kulturwissenschaft. <i>die hochschullehre: Interdisziplinäre Zeitschrift
    für Studium und Lehre</i>. 2026;12:65-80. doi:<a href="https://doi.org/10.3278/HSL2606W">10.3278/HSL2606W</a>'
  apa: 'Hannebohm, R. (2026). Potenziale der Portfolioarbeit für den Aufbau vernetzten
    Wissens im Bachelorstudium: Eine Explorationsstudie im Studienfach Komparatistik/Vergleichende
    Literatur- und Kulturwissenschaft. <i>die hochschullehre: Interdisziplinäre Zeitschrift
    für Studium und Lehre</i>, <i>12</i>, 65–80. <a href="https://doi.org/10.3278/HSL2606W">https://doi.org/10.3278/HSL2606W</a>'
  bibtex: '@article{Hannebohm_2026, title={Potenziale der Portfolioarbeit für den
    Aufbau vernetzten Wissens im Bachelorstudium: Eine Explorationsstudie im Studienfach
    Komparatistik/Vergleichende Literatur- und Kulturwissenschaft}, volume={12}, DOI={<a
    href="https://doi.org/10.3278/HSL2606W">10.3278/HSL2606W</a>}, journal={die hochschullehre:
    Interdisziplinäre Zeitschrift für Studium und Lehre}, publisher={wbv}, author={Hannebohm,
    Ronja}, year={2026}, pages={65–80} }'
  chicago: 'Hannebohm, Ronja. “Potenziale der Portfolioarbeit für den Aufbau vernetzten
    Wissens im Bachelorstudium: Eine Explorationsstudie im Studienfach Komparatistik/Vergleichende
    Literatur- und Kulturwissenschaft.” <i>die hochschullehre: Interdisziplinäre Zeitschrift
    für Studium und Lehre</i> 12 (2026): 65–80. <a href="https://doi.org/10.3278/HSL2606W">https://doi.org/10.3278/HSL2606W</a>.'
  ieee: 'R. Hannebohm, “Potenziale der Portfolioarbeit für den Aufbau vernetzten Wissens
    im Bachelorstudium: Eine Explorationsstudie im Studienfach Komparatistik/Vergleichende
    Literatur- und Kulturwissenschaft,” <i>die hochschullehre: Interdisziplinäre Zeitschrift
    für Studium und Lehre</i>, vol. 12, pp. 65–80, 2026, doi: <a href="https://doi.org/10.3278/HSL2606W">10.3278/HSL2606W</a>.'
  mla: 'Hannebohm, Ronja. “Potenziale der Portfolioarbeit für den Aufbau vernetzten
    Wissens im Bachelorstudium: Eine Explorationsstudie im Studienfach Komparatistik/Vergleichende
    Literatur- und Kulturwissenschaft.” <i>die hochschullehre: Interdisziplinäre Zeitschrift
    für Studium und Lehre</i>, vol. 12, wbv, 2026, pp. 65–80, doi:<a href="https://doi.org/10.3278/HSL2606W">10.3278/HSL2606W</a>.'
  short: 'R. Hannebohm, die hochschullehre: Interdisziplinäre Zeitschrift für Studium
    und Lehre 12 (2026) 65–80.'
date_created: 2025-09-29T12:34:48Z
date_updated: 2026-02-03T10:59:36Z
department:
- _id: '116'
doi: 10.3278/HSL2606W
intvolume: '        12'
keyword:
- Portfolioarbeit
- portfolio work
- vernetztes Wissen
- knowledge networks
- Beobachtung
- naturalistic observation
- Inhaltsanalyse
- content analysis
language:
- iso: ger
main_file_link:
- open_access: '1'
  url: https://www.wbv.de/shop/Paderborner-Beitraege-2025-HSLT2601W
oa: '1'
page: 65-80
publication: 'die hochschullehre: Interdisziplinäre Zeitschrift für Studium und Lehre'
publication_identifier:
  issn:
  - 2199–8825
publication_status: published
publisher: wbv
quality_controlled: '1'
status: public
title: 'Potenziale der Portfolioarbeit für den Aufbau vernetzten Wissens im Bachelorstudium:
  Eine Explorationsstudie im Studienfach Komparatistik/Vergleichende Literatur- und
  Kulturwissenschaft'
type: journal_article
user_id: '27419'
volume: 12
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: 2026-02-03T12:58:44Z
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
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: '63860'
citation:
  ama: Hogan A, Satoh K, Dag H, Turhan A-Y, Roman D, Soylu A, eds. <i>Rules and Reasoning
    - 9th International Joint Conference, RuleML+RR 2025, Istanbul, Turkey, September
    22-24, 2025, Proceedings</i>. Vol 16144. Springer; 2026. doi:<a href="https://doi.org/10.1007/978-3-032-08887-1">10.1007/978-3-032-08887-1</a>
  apa: Hogan, A., Satoh, K., Dag, H., Turhan, A.-Y., Roman, D., &#38; Soylu, A. (Eds.).
    (2026). <i>Rules and Reasoning - 9th International Joint Conference, RuleML+RR
    2025, Istanbul, Turkey, September 22-24, 2025, Proceedings</i> (Vol. 16144). Springer.
    <a href="https://doi.org/10.1007/978-3-032-08887-1">https://doi.org/10.1007/978-3-032-08887-1</a>
  bibtex: '@book{Hogan_Satoh_Dag_Turhan_Roman_Soylu_2026, series={Lecture Notes in
    Computer Science}, title={Rules and Reasoning - 9th International Joint Conference,
    RuleML+RR 2025, Istanbul, Turkey, September 22-24, 2025, Proceedings}, volume={16144},
    DOI={<a href="https://doi.org/10.1007/978-3-032-08887-1">10.1007/978-3-032-08887-1</a>},
    publisher={Springer}, year={2026}, collection={Lecture Notes in Computer Science}
    }'
  chicago: Hogan, Aidan, Ken Satoh, Hasan Dag, Anni-Yasmin Turhan, Dumitru Roman,
    and Ahmet Soylu, eds. <i>Rules and Reasoning - 9th International Joint Conference,
    RuleML+RR 2025, Istanbul, Turkey, September 22-24, 2025, Proceedings</i>. Vol.
    16144. Lecture Notes in Computer Science. Springer, 2026. <a href="https://doi.org/10.1007/978-3-032-08887-1">https://doi.org/10.1007/978-3-032-08887-1</a>.
  ieee: A. Hogan, K. Satoh, H. Dag, A.-Y. Turhan, D. Roman, and A. Soylu, Eds., <i>Rules
    and Reasoning - 9th International Joint Conference, RuleML+RR 2025, Istanbul,
    Turkey, September 22-24, 2025, Proceedings</i>, vol. 16144. Springer, 2026.
  mla: Hogan, Aidan, et al., editors. <i>Rules and Reasoning - 9th International Joint
    Conference, RuleML+RR 2025, Istanbul, Turkey, September 22-24, 2025, Proceedings</i>.
    Springer, 2026, doi:<a href="https://doi.org/10.1007/978-3-032-08887-1">10.1007/978-3-032-08887-1</a>.
  short: A. Hogan, K. Satoh, H. Dag, A.-Y. Turhan, D. Roman, A. Soylu, eds., Rules
    and Reasoning - 9th International Joint Conference, RuleML+RR 2025, Istanbul,
    Turkey, September 22-24, 2025, Proceedings, Springer, 2026.
date_created: 2026-02-04T07:12:48Z
date_updated: 2026-02-04T07:13:38Z
doi: 10.1007/978-3-032-08887-1
editor:
- first_name: Aidan
  full_name: Hogan, Aidan
  last_name: Hogan
- first_name: Ken
  full_name: Satoh, Ken
  last_name: Satoh
- first_name: Hasan
  full_name: Dag, Hasan
  last_name: Dag
- first_name: Anni-Yasmin
  full_name: Turhan, Anni-Yasmin
  id: '104470'
  last_name: Turhan
- first_name: Dumitru
  full_name: Roman, Dumitru
  last_name: Roman
- first_name: Ahmet
  full_name: Soylu, Ahmet
  last_name: Soylu
intvolume: '     16144'
language:
- iso: eng
publication_identifier:
  isbn:
  - 978-3-032-08886-4
publisher: Springer
series_title: Lecture Notes in Computer Science
status: public
title: Rules and Reasoning - 9th International Joint Conference, RuleML+RR 2025, Istanbul,
  Turkey, September 22-24, 2025, Proceedings
type: conference_editor
user_id: '117185'
volume: 16144
year: '2026'
...
---
_id: '61310'
abstract:
- lang: eng
  text: "Service systems engineering relies on structured, top-down approaches to
    designing and\r\ninnovating service systems. In today’s dynamic environments—shaped
    by digital transformation,\r\nevolving provider–user interactions, and shifting
    societal demands—these approaches face limitations in enabling continuous, context-sensitive
    innovation. Continuous Value Shaping emerges as a conceptual extension to service
    systems engineering, promoting more adaptive and co-evolutionary forms of service
    system development. This study examines how Continuous Value Shaping manifests
    through a multiple case study of three public sector projects. We identify distinct
    manifestations and constellations of the concept’s principles that complement
    classical\r\nSSE practices. As the first empirical exploration of Continuous Value
    Shaping, the study refines its\r\nconceptual foundation and enhances its accessibility
    for researchers and practitioners. We conclude with seven empirically derived
    propositions that inform future service systems engineering initiatives and demonstrate
    how Continuous Value Shaping supports the dynamic alignment of service systems
    with societal and systemic demands."
author:
- first_name: Jannika Marie
  full_name: Schäfer, Jannika Marie
  id: '74374'
  last_name: Schäfer
- first_name: Polina
  full_name: Rajko, Polina
  last_name: Rajko
- first_name: Daniela
  full_name: Angelova, Daniela
  last_name: Angelova
- first_name: Tilo
  full_name: Böhmann, Tilo
  last_name: Böhmann
citation:
  ama: 'Schäfer JM, Rajko P, Angelova D, Böhmann T. From Engineering to Shaping: A
    Multiple Case Study on Advancing Service Systems Engineering through Continuous
    Value Shaping. In: <i>Proceedings of the 59th Hawaii International Conference
    on System Sciences (HICSS 2026)</i>. Association for Information Systems (AIS),
    IEEE Computer Society Press, University of Hawaii (Manoa); 2026.'
  apa: 'Schäfer, J. M., Rajko, P., Angelova, D., &#38; Böhmann, T. (2026). From Engineering
    to Shaping: A Multiple Case Study on Advancing Service Systems Engineering through
    Continuous Value Shaping. <i>Proceedings of the 59th Hawaii International Conference
    on System Sciences (HICSS 2026)</i>. 59th Hawaii International Conference on System
    Sciences (HICSS 2026), Maui, Maui, Hawaii, USA.'
  bibtex: '@inproceedings{Schäfer_Rajko_Angelova_Böhmann_2026, place={Maui, Hawaii,
    USA}, title={From Engineering to Shaping: A Multiple Case Study on Advancing Service
    Systems Engineering through Continuous Value Shaping}, booktitle={Proceedings
    of the 59th Hawaii International Conference on System Sciences (HICSS 2026)},
    publisher={Association for Information Systems (AIS), IEEE Computer Society Press,
    University of Hawaii (Manoa)}, author={Schäfer, Jannika Marie and Rajko, Polina
    and Angelova, Daniela and Böhmann, Tilo}, year={2026} }'
  chicago: 'Schäfer, Jannika Marie, Polina Rajko, Daniela Angelova, and Tilo Böhmann.
    “From Engineering to Shaping: A Multiple Case Study on Advancing Service Systems
    Engineering through Continuous Value Shaping.” In <i>Proceedings of the 59th Hawaii
    International Conference on System Sciences (HICSS 2026)</i>. Maui, Hawaii, USA:
    Association for Information Systems (AIS), IEEE Computer Society Press, University
    of Hawaii (Manoa), 2026.'
  ieee: 'J. M. Schäfer, P. Rajko, D. Angelova, and T. Böhmann, “From Engineering to
    Shaping: A Multiple Case Study on Advancing Service Systems Engineering through
    Continuous Value Shaping,” presented at the 59th Hawaii International Conference
    on System Sciences (HICSS 2026), Maui, Maui, Hawaii, USA, 2026.'
  mla: 'Schäfer, Jannika Marie, et al. “From Engineering to Shaping: A Multiple Case
    Study on Advancing Service Systems Engineering through Continuous Value Shaping.”
    <i>Proceedings of the 59th Hawaii International Conference on System Sciences
    (HICSS 2026)</i>, Association for Information Systems (AIS), IEEE Computer Society
    Press, University of Hawaii (Manoa), 2026.'
  short: 'J.M. Schäfer, P. Rajko, D. Angelova, T. Böhmann, in: Proceedings of the
    59th Hawaii International Conference on System Sciences (HICSS 2026), Association
    for Information Systems (AIS), IEEE Computer Society Press, University of Hawaii
    (Manoa), Maui, Hawaii, USA, 2026.'
conference:
  end_date: 2026-01-09
  location: Maui, Maui, Hawaii, USA
  name: 59th Hawaii International Conference on System Sciences (HICSS 2026)
  start_date: 2026-01-06
date_created: 2025-09-16T13:55:52Z
date_updated: 2026-02-05T06:57:02Z
department:
- _id: '195'
jel:
- M15
keyword:
- Continuous Value Shaping
- Service Systems Engineering
- Service Science
- Public Sector
- Service Innovation
language:
- iso: eng
place: Maui, Hawaii, USA
project:
- _id: '1250'
  name: 'SHAPE : Gestaltung von Dienstleistungsentwicklungsprozessen und lnnovationspartnerschaften
    mit Unternehmen'
publication: Proceedings of the 59th Hawaii International Conference on System Sciences
  (HICSS 2026)
publication_status: published
publisher: Association for Information Systems (AIS), IEEE Computer Society Press,
  University of Hawaii (Manoa)
quality_controlled: '1'
status: public
title: 'From Engineering to Shaping: A Multiple Case Study on Advancing Service Systems
  Engineering through Continuous Value Shaping'
type: conference
user_id: '74374'
year: '2026'
...
---
_id: '63881'
abstract:
- lang: eng
  text: |-
    <jats:title>Abstract</jats:title>
                      <jats:p>
                        The relationship between leptin levels and psychiatric disorders has been studied more extensively in adults than in children and adolescents. However, the results are conflicting. We investigated serum leptin levels in children and adolescents (11 to 18.9 years) with psychiatric disorders (
                        <jats:italic>n</jats:italic>
                         = 363). Absolute and relative (body-mass-index (BMI)-, sex- and pubertal-stage-adjusted z-scores using reference values of healthy children and adolescents) leptin levels of different patient groups according to diagnosis were compared. The association between leptin levels and depression (Beck Depression Inventory-II) and anxiety (Child Behavior Checklist and Youth Self Report) was examined using regression analysis. Leptin z-scores were higher in patients with psychiatric disorders than in healthy controls (median 1.50,
                        <jats:italic>p</jats:italic>
                         &lt; .001). While global tests suggested differences in leptin z-scores between patients with different psychiatric disorders, these differences could not be attributed to diagnosis groups in post-hoc pairwise comparisons. Absolute leptin levels differed between psychiatric disorders (
                        <jats:italic>p</jats:italic>
                         &lt; .001). Patients with anorexia nervosa (AN) had the lowest levels, and patients with mood disorders had higher leptin levels than patients with mental disorders other than mood disorders, anxiety or AN. Neither absolute nor relative leptin levels were related to depressive or anxiety symptoms in regression models adjusted for sex and BMI. Significantly elevated BMI-, sex- and puberty-stage-adjusted leptin levels were observed in children and adolescents with psychiatric disorders compared to a reference sample. Further controlled studies are needed to confirm and explain this finding. No relationship was found between absolute or relative leptin levels and symptoms of depression or anxiety.
                      </jats:p>
author:
- first_name: Nicola
  full_name: Albers, Nicola
  last_name: Albers
- first_name: Jochen
  full_name: Antel, Jochen
  last_name: Antel
- first_name: Manuel
  full_name: Föcker, Manuel
  last_name: Föcker
- first_name: Lars
  full_name: Libuda, Lars
  last_name: Libuda
- first_name: Judith
  full_name: Bühlmeier, Judith
  last_name: Bühlmeier
- first_name: Raphael
  full_name: Hirtz, Raphael
  last_name: Hirtz
- first_name: Jochen
  full_name: Seitz, Jochen
  last_name: Seitz
- first_name: Anke
  full_name: Hinney, Anke
  last_name: Hinney
- first_name: Johannes
  full_name: Hebebrand, Johannes
  last_name: Hebebrand
- first_name: Triinu
  full_name: Peters, Triinu
  last_name: Peters
citation:
  ama: Albers N, Antel J, Föcker M, et al. Children and adolescents with psychiatric
    disorders have high relative leptin levels upon adjustment for sex, BMI, and pubertal
    status. <i>European Child &#38;amp; Adolescent Psychiatry</i>. Published online
    2026. doi:<a href="https://doi.org/10.1007/s00787-025-02921-4">10.1007/s00787-025-02921-4</a>
  apa: Albers, N., Antel, J., Föcker, M., Libuda, L., Bühlmeier, J., Hirtz, R., Seitz,
    J., Hinney, A., Hebebrand, J., &#38; Peters, T. (2026). Children and adolescents
    with psychiatric disorders have high relative leptin levels upon adjustment for
    sex, BMI, and pubertal status. <i>European Child &#38;amp; Adolescent Psychiatry</i>.
    <a href="https://doi.org/10.1007/s00787-025-02921-4">https://doi.org/10.1007/s00787-025-02921-4</a>
  bibtex: '@article{Albers_Antel_Föcker_Libuda_Bühlmeier_Hirtz_Seitz_Hinney_Hebebrand_Peters_2026,
    title={Children and adolescents with psychiatric disorders have high relative
    leptin levels upon adjustment for sex, BMI, and pubertal status}, DOI={<a href="https://doi.org/10.1007/s00787-025-02921-4">10.1007/s00787-025-02921-4</a>},
    journal={European Child &#38;amp; Adolescent Psychiatry}, publisher={Springer
    Science and Business Media LLC}, author={Albers, Nicola and Antel, Jochen and
    Föcker, Manuel and Libuda, Lars and Bühlmeier, Judith and Hirtz, Raphael and Seitz,
    Jochen and Hinney, Anke and Hebebrand, Johannes and Peters, Triinu}, year={2026}
    }'
  chicago: Albers, Nicola, Jochen Antel, Manuel Föcker, Lars Libuda, Judith Bühlmeier,
    Raphael Hirtz, Jochen Seitz, Anke Hinney, Johannes Hebebrand, and Triinu Peters.
    “Children and Adolescents with Psychiatric Disorders Have High Relative Leptin
    Levels upon Adjustment for Sex, BMI, and Pubertal Status.” <i>European Child &#38;amp;
    Adolescent Psychiatry</i>, 2026. <a href="https://doi.org/10.1007/s00787-025-02921-4">https://doi.org/10.1007/s00787-025-02921-4</a>.
  ieee: 'N. Albers <i>et al.</i>, “Children and adolescents with psychiatric disorders
    have high relative leptin levels upon adjustment for sex, BMI, and pubertal status,”
    <i>European Child &#38;amp; Adolescent Psychiatry</i>, 2026, doi: <a href="https://doi.org/10.1007/s00787-025-02921-4">10.1007/s00787-025-02921-4</a>.'
  mla: Albers, Nicola, et al. “Children and Adolescents with Psychiatric Disorders
    Have High Relative Leptin Levels upon Adjustment for Sex, BMI, and Pubertal Status.”
    <i>European Child &#38;amp; Adolescent Psychiatry</i>, Springer Science and Business
    Media LLC, 2026, doi:<a href="https://doi.org/10.1007/s00787-025-02921-4">10.1007/s00787-025-02921-4</a>.
  short: N. Albers, J. Antel, M. Föcker, L. Libuda, J. Bühlmeier, R. Hirtz, J. Seitz,
    A. Hinney, J. Hebebrand, T. Peters, European Child &#38;amp; Adolescent Psychiatry
    (2026).
date_created: 2026-02-05T09:21:46Z
date_updated: 2026-02-05T09:22:02Z
department:
- _id: '35'
- _id: '17'
- _id: '22'
doi: 10.1007/s00787-025-02921-4
language:
- iso: eng
publication: European Child &amp; Adolescent Psychiatry
publication_identifier:
  issn:
  - 1018-8827
  - 1435-165X
publication_status: published
publisher: Springer Science and Business Media LLC
status: public
title: Children and adolescents with psychiatric disorders have high relative leptin
  levels upon adjustment for sex, BMI, and pubertal status
type: journal_article
user_id: '88682'
year: '2026'
...
---
_id: '63880'
author:
- first_name: Nadja
  full_name: Knoll-Pientka, Nadja
  last_name: Knoll-Pientka
- first_name: Dorina
  full_name: Schils, Dorina
  last_name: Schils
- first_name: Katrin
  full_name: Mantwill, Katrin
  last_name: Mantwill
- first_name: Hannah
  full_name: Dinse, Hannah
  last_name: Dinse
- first_name: Eva-Maria
  full_name: Skoda, Eva-Maria
  last_name: Skoda
- first_name: Alexander
  full_name: Bäuerle, Alexander
  last_name: Bäuerle
- first_name: Martin
  full_name: Teufel, Martin
  last_name: Teufel
- first_name: Lars
  full_name: Libuda, Lars
  last_name: Libuda
citation:
  ama: Knoll-Pientka N, Schils D, Mantwill K, et al. Adherence to dietary recommendations
    according to the General Dietary Behavior Inventory (GDBI) and its association
    with bioelectrical impedance analysis (BIA) parameters among young, healthy and
    normal weight women. <i>BMC Nutrition</i>. Published online 2026. doi:<a href="https://doi.org/10.1186/s40795-026-01260-0">10.1186/s40795-026-01260-0</a>
  apa: Knoll-Pientka, N., Schils, D., Mantwill, K., Dinse, H., Skoda, E.-M., Bäuerle,
    A., Teufel, M., &#38; Libuda, L. (2026). Adherence to dietary recommendations
    according to the General Dietary Behavior Inventory (GDBI) and its association
    with bioelectrical impedance analysis (BIA) parameters among young, healthy and
    normal weight women. <i>BMC Nutrition</i>. <a href="https://doi.org/10.1186/s40795-026-01260-0">https://doi.org/10.1186/s40795-026-01260-0</a>
  bibtex: '@article{Knoll-Pientka_Schils_Mantwill_Dinse_Skoda_Bäuerle_Teufel_Libuda_2026,
    title={Adherence to dietary recommendations according to the General Dietary Behavior
    Inventory (GDBI) and its association with bioelectrical impedance analysis (BIA)
    parameters among young, healthy and normal weight women}, DOI={<a href="https://doi.org/10.1186/s40795-026-01260-0">10.1186/s40795-026-01260-0</a>},
    journal={BMC Nutrition}, publisher={Springer Science and Business Media LLC},
    author={Knoll-Pientka, Nadja and Schils, Dorina and Mantwill, Katrin and Dinse,
    Hannah and Skoda, Eva-Maria and Bäuerle, Alexander and Teufel, Martin and Libuda,
    Lars}, year={2026} }'
  chicago: Knoll-Pientka, Nadja, Dorina Schils, Katrin Mantwill, Hannah Dinse, Eva-Maria
    Skoda, Alexander Bäuerle, Martin Teufel, and Lars Libuda. “Adherence to Dietary
    Recommendations According to the General Dietary Behavior Inventory (GDBI) and
    Its Association with Bioelectrical Impedance Analysis (BIA) Parameters among Young,
    Healthy and Normal Weight Women.” <i>BMC Nutrition</i>, 2026. <a href="https://doi.org/10.1186/s40795-026-01260-0">https://doi.org/10.1186/s40795-026-01260-0</a>.
  ieee: 'N. Knoll-Pientka <i>et al.</i>, “Adherence to dietary recommendations according
    to the General Dietary Behavior Inventory (GDBI) and its association with bioelectrical
    impedance analysis (BIA) parameters among young, healthy and normal weight women,”
    <i>BMC Nutrition</i>, 2026, doi: <a href="https://doi.org/10.1186/s40795-026-01260-0">10.1186/s40795-026-01260-0</a>.'
  mla: Knoll-Pientka, Nadja, et al. “Adherence to Dietary Recommendations According
    to the General Dietary Behavior Inventory (GDBI) and Its Association with Bioelectrical
    Impedance Analysis (BIA) Parameters among Young, Healthy and Normal Weight Women.”
    <i>BMC Nutrition</i>, Springer Science and Business Media LLC, 2026, doi:<a href="https://doi.org/10.1186/s40795-026-01260-0">10.1186/s40795-026-01260-0</a>.
  short: N. Knoll-Pientka, D. Schils, K. Mantwill, H. Dinse, E.-M. Skoda, A. Bäuerle,
    M. Teufel, L. Libuda, BMC Nutrition (2026).
date_created: 2026-02-05T09:20:38Z
date_updated: 2026-02-05T09:21:23Z
department:
- _id: '35'
- _id: '17'
- _id: '22'
doi: 10.1186/s40795-026-01260-0
language:
- iso: eng
publication: BMC Nutrition
publication_identifier:
  issn:
  - 2055-0928
publication_status: published
publisher: Springer Science and Business Media LLC
status: public
title: Adherence to dietary recommendations according to the General Dietary Behavior
  Inventory (GDBI) and its association with bioelectrical impedance analysis (BIA)
  parameters among young, healthy and normal weight women
type: journal_article
user_id: '88682'
year: '2026'
...
---
_id: '63883'
abstract:
- lang: eng
  text: Proton exchange membranes (PEMs) are essential for fuel cells, yet conventional
    materials like Nafion suffer from humidity dependence and limited thermal stability.
    This study introduces sulfonated phenylene-bridged periodic mesoporous organosilicas
    (PMOs) as promising inorganic–organic hybrid PEMs, synthesized via surfactant-templating
    with varying alkyl chain lengths for different mesopore sizes. Post-synthetic
    functionalization involves nitration of phenylene moieties, reduction to amines,
    and ring-opening of propane or butane sultones to graft sulfonic acid groups via
    flexible spacers, achieving homogeneous distribution along pore walls. Post-functionalization
    is confirmed by powder X-ray diffraction (PXRD), revealing preserved 2D hexagonal
    p6mm ordering and phenylene stacking. N2 physisorption shows type IV isotherms
    with reduced pore volumes and pore sizes. 1H NMR is used to quantify functionalization
    degrees. Impedance spectroscopy on pressed pellets demonstrates proton conductivities
    up to 2 × 10−3 S cm−1 at 30 °C and 90% RH, depending on the functionalization
    degree, confirming sulfonic acid-mediated conduction.
article_number: '203'
author:
- first_name: Tobias
  full_name: Wagner, Tobias
  last_name: Wagner
- first_name: Michael
  full_name: Tiemann, Michael
  id: '23547'
  last_name: Tiemann
  orcid: 0000-0003-1711-2722
citation:
  ama: Wagner T, Tiemann M. Proton-Conducting Sulfonated Periodic Mesoporous Organosilica.
    <i>Nanomaterials</i>. 2026;16(3). doi:<a href="https://doi.org/10.3390/nano16030203">10.3390/nano16030203</a>
  apa: Wagner, T., &#38; Tiemann, M. (2026). Proton-Conducting Sulfonated Periodic
    Mesoporous Organosilica. <i>Nanomaterials</i>, <i>16</i>(3), Article 203. <a href="https://doi.org/10.3390/nano16030203">https://doi.org/10.3390/nano16030203</a>
  bibtex: '@article{Wagner_Tiemann_2026, title={Proton-Conducting Sulfonated Periodic
    Mesoporous Organosilica}, volume={16}, DOI={<a href="https://doi.org/10.3390/nano16030203">10.3390/nano16030203</a>},
    number={3203}, journal={Nanomaterials}, publisher={MDPI AG}, author={Wagner, Tobias
    and Tiemann, Michael}, year={2026} }'
  chicago: Wagner, Tobias, and Michael Tiemann. “Proton-Conducting Sulfonated Periodic
    Mesoporous Organosilica.” <i>Nanomaterials</i> 16, no. 3 (2026). <a href="https://doi.org/10.3390/nano16030203">https://doi.org/10.3390/nano16030203</a>.
  ieee: 'T. Wagner and M. Tiemann, “Proton-Conducting Sulfonated Periodic Mesoporous
    Organosilica,” <i>Nanomaterials</i>, vol. 16, no. 3, Art. no. 203, 2026, doi:
    <a href="https://doi.org/10.3390/nano16030203">10.3390/nano16030203</a>.'
  mla: Wagner, Tobias, and Michael Tiemann. “Proton-Conducting Sulfonated Periodic
    Mesoporous Organosilica.” <i>Nanomaterials</i>, vol. 16, no. 3, 203, MDPI AG,
    2026, doi:<a href="https://doi.org/10.3390/nano16030203">10.3390/nano16030203</a>.
  short: T. Wagner, M. Tiemann, Nanomaterials 16 (2026).
date_created: 2026-02-05T09:46:20Z
date_updated: 2026-02-05T09:48:27Z
department:
- _id: '35'
- _id: '2'
- _id: '307'
doi: 10.3390/nano16030203
intvolume: '        16'
issue: '3'
language:
- iso: eng
main_file_link:
- open_access: '1'
oa: '1'
publication: Nanomaterials
publication_identifier:
  issn:
  - 2079-4991
publication_status: published
publisher: MDPI AG
quality_controlled: '1'
status: public
title: Proton-Conducting Sulfonated Periodic Mesoporous Organosilica
type: journal_article
user_id: '23547'
volume: 16
year: '2026'
...
---
_id: '63423'
author:
- first_name: Christoph
  full_name: Ribbat, Christoph
  id: '426'
  last_name: Ribbat
citation:
  ama: 'Ribbat C. <i>In den Tag: Eine kurze Geschichte des Aufwachens</i>. Insel;
    2026.'
  apa: 'Ribbat, C. (2026). <i>In den Tag: Eine kurze Geschichte des Aufwachens</i>.
    Insel.'
  bibtex: '@book{Ribbat_2026, place={Berlin}, title={In den Tag: Eine kurze Geschichte
    des Aufwachens}, publisher={Insel}, author={Ribbat, Christoph}, year={2026} }'
  chicago: 'Ribbat, Christoph. <i>In den Tag: Eine kurze Geschichte des Aufwachens</i>.
    Berlin: Insel, 2026.'
  ieee: 'C. Ribbat, <i>In den Tag: Eine kurze Geschichte des Aufwachens</i>. Berlin:
    Insel, 2026.'
  mla: 'Ribbat, Christoph. <i>In den Tag: Eine kurze Geschichte des Aufwachens</i>.
    Insel, 2026.'
  short: 'C. Ribbat, In den Tag: Eine kurze Geschichte des Aufwachens, Insel, Berlin,
    2026.'
date_created: 2025-12-29T10:00:07Z
date_updated: 2026-02-05T10:59:58Z
language:
- iso: ger
page: '166'
place: Berlin
publication_identifier:
  unknown:
  - 978-3-458-64584-9
publication_status: published
publisher: Insel
status: public
title: 'In den Tag: Eine kurze Geschichte des Aufwachens'
type: book
user_id: '426'
year: '2026'
...
---
_id: '63889'
author:
- first_name: Tobias
  full_name: Jenert, Tobias
  id: '71994'
  last_name: Jenert
  orcid: ' https://orcid.org/0000-0001-9262-5646'
citation:
  ama: 'Jenert T. Über das Didaktische in der Wissenschaft. In: Hofhues S, Lübcke
    E, Schiefner-Rohs M, eds. <i> Medien, Didaktik, Hochschule: Reflexionen Und Resonanzen</i>.
    ; 2026:91-98. doi:<a href="https://doi.org/9783839424490">9783839424490</a>'
  apa: 'Jenert, T. (2026). Über das Didaktische in der Wissenschaft. In S. Hofhues,
    E. Lübcke, &#38; M. Schiefner-Rohs (Eds.), <i> Medien, Didaktik, Hochschule: Reflexionen
    und Resonanzen</i> (pp. 91–98). <a href="https://doi.org/9783839424490">https://doi.org/9783839424490</a>'
  bibtex: '@inbook{Jenert_2026, title={Über das Didaktische in der Wissenschaft},
    DOI={<a href="https://doi.org/9783839424490">9783839424490</a>}, booktitle={ Medien,
    Didaktik, Hochschule: Reflexionen und Resonanzen}, author={Jenert, Tobias}, editor={Hofhues,
    Sandra and Lübcke, Eileen and Schiefner-Rohs, Mandy}, year={2026}, pages={91–98}
    }'
  chicago: 'Jenert, Tobias. “Über Das Didaktische in Der Wissenschaft.” In <i> Medien,
    Didaktik, Hochschule: Reflexionen Und Resonanzen</i>, edited by Sandra Hofhues,
    Eileen Lübcke, and Mandy Schiefner-Rohs, 91–98, 2026. <a href="https://doi.org/9783839424490">https://doi.org/9783839424490</a>.'
  ieee: 'T. Jenert, “Über das Didaktische in der Wissenschaft,” in <i> Medien, Didaktik,
    Hochschule: Reflexionen und Resonanzen</i>, S. Hofhues, E. Lübcke, and M. Schiefner-Rohs,
    Eds. 2026, pp. 91–98.'
  mla: 'Jenert, Tobias. “Über Das Didaktische in Der Wissenschaft.” <i> Medien, Didaktik,
    Hochschule: Reflexionen Und Resonanzen</i>, edited by Sandra Hofhues et al., 2026,
    pp. 91–98, doi:<a href="https://doi.org/9783839424490">9783839424490</a>.'
  short: 'T. Jenert, in: S. Hofhues, E. Lübcke, M. Schiefner-Rohs (Eds.),  Medien,
    Didaktik, Hochschule: Reflexionen Und Resonanzen, 2026, pp. 91–98.'
date_created: 2026-02-05T14:06:22Z
date_updated: 2026-02-05T14:06:59Z
department:
- _id: '208'
- _id: '640'
doi: '9783839424490'
editor:
- first_name: Sandra
  full_name: Hofhues, Sandra
  last_name: Hofhues
- first_name: Eileen
  full_name: Lübcke, Eileen
  last_name: Lübcke
- first_name: Mandy
  full_name: Schiefner-Rohs, Mandy
  last_name: Schiefner-Rohs
language:
- iso: eng
page: 91-98
publication: ' Medien, Didaktik, Hochschule: Reflexionen und Resonanzen'
status: public
title: Über das Didaktische in der Wissenschaft
type: book_chapter
user_id: '71994'
year: '2026'
...
---
_id: '63898'
author:
- first_name: Friedrich
  full_name: Markewitz, Friedrich
  id: '67227'
  last_name: Markewitz
citation:
  ama: Markewitz F. Langrezension zu James McElvennys “Entstehung und Entwicklung
    der modernen Linguistik. Von den Anfängen bis zum Zweiten Weltkrieg.” <i>Zeitschrift
    für Angewandte Linguistik</i>. 2026;84.
  apa: Markewitz, F. (2026). Langrezension zu James McElvennys “Entstehung und Entwicklung
    der modernen Linguistik. Von den Anfängen bis zum Zweiten Weltkrieg.” In <i>Zeitschrift
    für Angewandte Linguistik</i> (Vol. 84).
  bibtex: '@article{Markewitz_2026, title={Langrezension zu James McElvennys “Entstehung
    und Entwicklung der modernen Linguistik. Von den Anfängen bis zum Zweiten Weltkrieg”},
    volume={84}, journal={Zeitschrift für Angewandte Linguistik}, author={Markewitz,
    Friedrich}, year={2026} }'
  chicago: Markewitz, Friedrich. “Langrezension zu James McElvennys ‘Entstehung und
    Entwicklung der modernen Linguistik. Von den Anfängen bis zum Zweiten Weltkrieg.’”
    <i>Zeitschrift für Angewandte Linguistik</i>, 2026.
  ieee: F. Markewitz, “Langrezension zu James McElvennys ‘Entstehung und Entwicklung
    der modernen Linguistik. Von den Anfängen bis zum Zweiten Weltkrieg,’” <i>Zeitschrift
    für Angewandte Linguistik</i>, vol. 84. 2026.
  mla: Markewitz, Friedrich. “Langrezension zu James McElvennys ‘Entstehung und Entwicklung
    der modernen Linguistik. Von den Anfängen bis zum Zweiten Weltkrieg.’” <i>Zeitschrift
    für Angewandte Linguistik</i>, vol. 84, 2026.
  short: F. Markewitz, Zeitschrift für Angewandte Linguistik 84 (2026).
date_created: 2026-02-06T07:59:43Z
date_updated: 2026-02-06T07:59:49Z
intvolume: '        84'
language:
- iso: ger
main_file_link:
- open_access: '1'
  url: https://www.degruyterbrill.com/document/doi/10.1515/zfal-2026-2009/html
oa: '1'
publication: Zeitschrift für Angewandte Linguistik
publication_status: epub_ahead
status: public
title: Langrezension zu James McElvennys 'Entstehung und Entwicklung der modernen
  Linguistik. Von den Anfängen bis zum Zweiten Weltkrieg'
type: review
user_id: '67227'
volume: 84
year: '2026'
...
---
_id: '63897'
author:
- first_name: Friedrich
  full_name: Markewitz, Friedrich
  id: '67227'
  last_name: Markewitz
citation:
  ama: Markewitz F. Langrezension zu Larissa Schüllers “Kommunikationsarbeit in Telefonzentralen.
    Eine Wissensgeschichte körperlicher und sprachlicher Praktiken des frühen 20.
    Jahrhunderts.” <i>Journal für Medienlinguistik</i>. 2026;8(1):11-16.
  apa: Markewitz, F. (2026). Langrezension zu Larissa Schüllers “Kommunikationsarbeit
    in Telefonzentralen. Eine Wissensgeschichte körperlicher und sprachlicher Praktiken
    des frühen 20. Jahrhunderts.” In <i>Journal für Medienlinguistik</i> (Vol. 8,
    Issue 1, pp. 11–16).
  bibtex: '@article{Markewitz_2026, title={Langrezension zu Larissa Schüllers “Kommunikationsarbeit
    in Telefonzentralen. Eine Wissensgeschichte körperlicher und sprachlicher Praktiken
    des frühen 20. Jahrhunderts”}, volume={8}, number={1}, journal={Journal für Medienlinguistik},
    author={Markewitz, Friedrich}, year={2026}, pages={11–16} }'
  chicago: Markewitz, Friedrich. “Langrezension zu Larissa Schüllers ‘Kommunikationsarbeit
    in Telefonzentralen. Eine Wissensgeschichte körperlicher und sprachlicher Praktiken
    des frühen 20. Jahrhunderts.’” <i>Journal für Medienlinguistik</i>, 2026.
  ieee: F. Markewitz, “Langrezension zu Larissa Schüllers ‘Kommunikationsarbeit in
    Telefonzentralen. Eine Wissensgeschichte körperlicher und sprachlicher Praktiken
    des frühen 20. Jahrhunderts,’” <i>Journal für Medienlinguistik</i>, vol. 8, no.
    1. pp. 11–16, 2026.
  mla: Markewitz, Friedrich. “Langrezension zu Larissa Schüllers ‘Kommunikationsarbeit
    in Telefonzentralen. Eine Wissensgeschichte körperlicher und sprachlicher Praktiken
    des frühen 20. Jahrhunderts.’” <i>Journal für Medienlinguistik</i>, vol. 8, no.
    1, 2026, pp. 11–16.
  short: F. Markewitz, Journal für Medienlinguistik 8 (2026) 11–16.
date_created: 2026-02-06T07:57:32Z
date_updated: 2026-02-06T07:57:55Z
intvolume: '         8'
issue: '1'
language:
- iso: ger
page: 11-16
publication: Journal für Medienlinguistik
publication_status: published
status: public
title: Langrezension zu Larissa Schüllers 'Kommunikationsarbeit in Telefonzentralen.
  Eine Wissensgeschichte körperlicher und sprachlicher Praktiken des frühen 20. Jahrhunderts'
type: review
user_id: '67227'
volume: 8
year: '2026'
...
---
_id: '63918'
abstract:
- lang: eng
  text: Many real-world datasets, such as citation networks, social networks, and
    molecular structures, are naturally represented as heterogeneous graphs, where
    nodes belong to different types and have additional features. For example, in
    a citation network, nodes representing "Paper" or "Author" may include attributes
    like keywords or affiliations. A critical machine learning task on these graphs
    is node classification, which is useful for applications such as fake news detection,
    corporate risk assessment, and molecular property prediction. Although Heterogeneous
    Graph Neural Networks (HGNNs) perform well in these contexts, their predictions
    remain opaque. Existing post-hoc explanation methods lack support for actual node
    features beyond one-hot encoding of node type and often fail to generate realistic,
    faithful explanations. To address these gaps, we propose DiGNNExplainer, a model-level
    explanation approach that synthesizes heterogeneous graphs with realistic node
    features via discrete denoising diffusion. In particular, we generate realistic
    discrete features (e.g., bag-of-words features) using diffusion models within
    a discrete space, whereas previous approaches are limited to continuous spaces.
    We evaluate our approach on multiple datasets and show that DiGNNExplainer produces
    explanations that are realistic and faithful to the model's decision-making, outperforming
    state-of-the-art methods.
author:
- first_name: Pallabee
  full_name: Das, Pallabee
  last_name: Das
- first_name: Stefan
  full_name: Heindorf, Stefan
  id: '11871'
  last_name: Heindorf
  orcid: 0000-0002-4525-6865
citation:
  ama: 'Das P, Heindorf S. Discrete Diffusion-Based Model-Level Explanation of Heterogeneous
    GNNs with Node Features. In: <i>Proceedings of the ACM Web Conference 2026 (WWW
    ’26)</i>. ACM; 2026.'
  apa: Das, P., &#38; Heindorf, S. (2026). Discrete Diffusion-Based Model-Level Explanation
    of Heterogeneous GNNs with Node Features. <i>Proceedings of the ACM Web Conference
    2026 (WWW ’26)</i>. The Web Conference, Dubai, United Arab Emirates.
  bibtex: '@inproceedings{Das_Heindorf_2026, title={Discrete Diffusion-Based Model-Level
    Explanation of Heterogeneous GNNs with Node Features}, booktitle={Proceedings
    of the ACM Web Conference 2026 (WWW ’26)}, publisher={ACM}, author={Das, Pallabee
    and Heindorf, Stefan}, year={2026} }'
  chicago: Das, Pallabee, and Stefan Heindorf. “Discrete Diffusion-Based Model-Level
    Explanation of Heterogeneous GNNs with Node Features.” In <i>Proceedings of the
    ACM Web Conference 2026 (WWW ’26)</i>. ACM, 2026.
  ieee: P. Das and S. Heindorf, “Discrete Diffusion-Based Model-Level Explanation
    of Heterogeneous GNNs with Node Features,” presented at the The Web Conference,
    Dubai, United Arab Emirates, 2026.
  mla: Das, Pallabee, and Stefan Heindorf. “Discrete Diffusion-Based Model-Level Explanation
    of Heterogeneous GNNs with Node Features.” <i>Proceedings of the ACM Web Conference
    2026 (WWW ’26)</i>, ACM, 2026.
  short: 'P. Das, S. Heindorf, in: Proceedings of the ACM Web Conference 2026 (WWW
    ’26), ACM, 2026.'
conference:
  end_date: 2026-04-17
  location: Dubai, United Arab Emirates
  name: The Web Conference
  start_date: 2026-04-13
date_created: 2026-02-06T18:44:34Z
date_updated: 2026-02-06T18:47:38Z
department:
- _id: '760'
external_id:
  arxiv:
  - '2508.08458'
language:
- iso: eng
main_file_link:
- open_access: '1'
  url: https://arxiv.org/pdf/2508.08458
oa: '1'
publication: Proceedings of the ACM Web Conference 2026 (WWW ’26)
publisher: ACM
status: public
title: Discrete Diffusion-Based Model-Level Explanation of Heterogeneous GNNs with
  Node Features
type: conference
user_id: '11871'
year: '2026'
...
---
_id: '63890'
abstract:
- lang: eng
  text: The computation of highly contracted electron repulsion integrals (ERIs) is
    essential to achieve quantum accuracy in atomistic simulations based on quantum
    mechanics. Its growing computational demands make energy efficiency a critical
    concern. Recent studies demonstrate FPGAs’ superior performance and energy efficiency
    for computing primitive ERIs, but the computation of highly contracted ERIs introduces
    significant algorithmic complexity and new design challenges for FPGA acceleration.In
    this work, we present SORCERI, the first streaming overlay acceleration for highly
    contracted ERI computations on FPGAs. SORCERI introduces a novel streaming Rys
    computing unit to calculate roots and weights of Rys polynomials on-chip, and
    a streaming contraction unit for the contraction of primitive ERIs. This shifts
    the design bottleneck from limited CPU-FPGA communication bandwidth to available
    FPGA computation resources. To address practical deployment challenges for a large
    number of quartet classes, we design three streaming overlays, together with an
    efficient memory transpose optimization, to cover the 21 most commonly used quartet
    classes in realistic atomistic simulations. To address the new computation constraints,
    we use flexible calculation stages with a free-running streaming architecture
    to achieve high DSP utilization and good timing closure.Experiments demonstrate
    that SORCERI achieves an average 5.96x, 1.99x, and 1.16x better performance per
    watt than libint on a 64-core AMD EPYC 7713 CPU, libintx on an Nvidia A40 GPU,
    and SERI, the prior best-performing FPGA design for primitive ERIs. Furthermore,
    SORCERI reaches a peak throughput of 44.11 GERIS (109 ERIs per second) that is
    1.52x, 1.13x, and 1.93x greater than libint, libintx and SERI, respectively. SORCERI
    will be released soon at https://github.com/SFU-HiAccel/SORCERI.
author:
- first_name: Philip
  full_name: Stachura, Philip
  last_name: Stachura
- first_name: Xin
  full_name: Wu, Xin
  id: '77439'
  last_name: Wu
- first_name: Christian
  full_name: Plessl, Christian
  id: '16153'
  last_name: Plessl
  orcid: 0000-0001-5728-9982
- first_name: Zhenman
  full_name: Fang, Zhenman
  last_name: Fang
citation:
  ama: 'Stachura P, Wu X, Plessl C, Fang Z. SORCERI: Streaming Overlay Acceleration
    for Highly Contracted Electron Repulsion Integral Computations in Quantum Chemistry.
    In: <i>Proceedings of the 2026 ACM/SIGDA International Symposium on Field Programmable
    Gate Arrays (FPGA ’26)</i>. Association for Computing Machinery; 2026:224-234.
    doi:<a href="https://doi.org/10.1145/3748173.3779198">10.1145/3748173.3779198</a>'
  apa: 'Stachura, P., Wu, X., Plessl, C., &#38; Fang, Z. (2026). SORCERI: Streaming
    Overlay Acceleration for Highly Contracted Electron Repulsion Integral Computations
    in Quantum Chemistry. <i>Proceedings of the 2026 ACM/SIGDA International Symposium
    on Field Programmable Gate Arrays (FPGA ’26)</i>, 224–234. <a href="https://doi.org/10.1145/3748173.3779198">https://doi.org/10.1145/3748173.3779198</a>'
  bibtex: '@inproceedings{Stachura_Wu_Plessl_Fang_2026, place={New York, NY, USA},
    title={SORCERI: Streaming Overlay Acceleration for Highly Contracted Electron
    Repulsion Integral Computations in Quantum Chemistry}, DOI={<a href="https://doi.org/10.1145/3748173.3779198">10.1145/3748173.3779198</a>},
    booktitle={Proceedings of the 2026 ACM/SIGDA International Symposium on Field
    Programmable Gate Arrays (FPGA ’26)}, publisher={Association for Computing Machinery},
    author={Stachura, Philip and Wu, Xin and Plessl, Christian and Fang, Zhenman},
    year={2026}, pages={224–234} }'
  chicago: 'Stachura, Philip, Xin Wu, Christian Plessl, and Zhenman Fang. “SORCERI:
    Streaming Overlay Acceleration for Highly Contracted Electron Repulsion Integral
    Computations in Quantum Chemistry.” In <i>Proceedings of the 2026 ACM/SIGDA International
    Symposium on Field Programmable Gate Arrays (FPGA ’26)</i>, 224–34. New York,
    NY, USA: Association for Computing Machinery, 2026. <a href="https://doi.org/10.1145/3748173.3779198">https://doi.org/10.1145/3748173.3779198</a>.'
  ieee: 'P. Stachura, X. Wu, C. Plessl, and Z. Fang, “SORCERI: Streaming Overlay Acceleration
    for Highly Contracted Electron Repulsion Integral Computations in Quantum Chemistry,”
    in <i>Proceedings of the 2026 ACM/SIGDA International Symposium on Field Programmable
    Gate Arrays (FPGA ’26)</i>, 2026, pp. 224–234, doi: <a href="https://doi.org/10.1145/3748173.3779198">10.1145/3748173.3779198</a>.'
  mla: 'Stachura, Philip, et al. “SORCERI: Streaming Overlay Acceleration for Highly
    Contracted Electron Repulsion Integral Computations in Quantum Chemistry.” <i>Proceedings
    of the 2026 ACM/SIGDA International Symposium on Field Programmable Gate Arrays
    (FPGA ’26)</i>, Association for Computing Machinery, 2026, pp. 224–34, doi:<a
    href="https://doi.org/10.1145/3748173.3779198">10.1145/3748173.3779198</a>.'
  short: 'P. Stachura, X. Wu, C. Plessl, Z. Fang, in: Proceedings of the 2026 ACM/SIGDA
    International Symposium on Field Programmable Gate Arrays (FPGA ’26), Association
    for Computing Machinery, New York, NY, USA, 2026, pp. 224–234.'
date_created: 2026-02-06T06:43:22Z
date_updated: 2026-02-09T09:16:32Z
department:
- _id: '27'
- _id: '518'
doi: 10.1145/3748173.3779198
keyword:
- electron repulsion integrals
- quantum chemistry
- atomistic simulation
- overlay architecture
- fpga acceleration
language:
- iso: eng
main_file_link:
- url: https://dl.acm.org/doi/10.1145/3748173.3779198
page: 224-234
place: New York, NY, USA
project:
- _id: '52'
  name: Computing Resources Provided by the Paderborn Center for Parallel Computing
publication: Proceedings of the 2026 ACM/SIGDA International Symposium on Field Programmable
  Gate Arrays (FPGA '26)
publication_identifier:
  isbn:
  - '9798400720796'
publication_status: published
publisher: Association for Computing Machinery
status: public
title: 'SORCERI: Streaming Overlay Acceleration for Highly Contracted Electron Repulsion
  Integral Computations in Quantum Chemistry'
type: conference
user_id: '77439'
year: '2026'
...
---
_id: '64068'
abstract:
- lang: eng
  text: "When do two irreducible polynomials with integer coefficients\r\n  define
    the same number field? One can define an action of\r\n  $\\mathrm{GL}_2 \\times
    \\mathrm{GL}_1$ on the space of polynomials of degree $n$ so that for any two\r\n
    \ polynomials $f$ and $g$ in the same orbit, the roots of $f$ may be expressed\r\n
    \ as rational linear transformations of the roots of $g$; thus, they generate\r\n
    \ the same field. In this article, we show that almost all polynomials of\r\n
    \ degree $n$ with size at most $X$ can only define the same number field as\r\n
    \ another polynomial of degree $n$ with size at most $X$ if they lie in the\r\n
    \ same orbit for this group action. (Here we measure the size of polynomials by\r\n
    \ the greatest absolute value of their coefficients.)\r\n  This improves on work
    of Bhargava, Shankar, and Wang, who proved a similar\r\n  statement for a positive
    proportion of polynomials. Using this result, we\r\n  prove that the number of
    degree $n$ fields such that the smallest polynomial\r\n  defining the field has
    size at most $X$ is asymptotic to a constant times\r\n  $X^{n+1}$ as long as $n\\geq
    3$. For $n = 2$, we obtain a precise asymptotic of\r\n  the form $\\frac{27}{π^2}
    X^2$."
author:
- first_name: Santiago
  full_name: Arango-Piñeros, Santiago
  last_name: Arango-Piñeros
- first_name: Fabian
  full_name: Gundlach, Fabian
  id: '100450'
  last_name: Gundlach
- first_name: Robert J.
  full_name: Lemke Oliver, Robert J.
  last_name: Lemke Oliver
- first_name: Kevin J.
  full_name: McGown, Kevin J.
  last_name: McGown
- first_name: Will
  full_name: Sawin, Will
  last_name: Sawin
- first_name: Allechar
  full_name: Serrano López, Allechar
  last_name: Serrano López
- first_name: Arul
  full_name: Shankar, Arul
  last_name: Shankar
- first_name: Ila
  full_name: Varma, Ila
  last_name: Varma
citation:
  ama: Arango-Piñeros S, Gundlach F, Lemke Oliver RJ, et al. Counting number fields
    of fixed degree by their smallest defining polynomial. <i>arXiv:260206943</i>.
    Published online 2026.
  apa: Arango-Piñeros, S., Gundlach, F., Lemke Oliver, R. J., McGown, K. J., Sawin,
    W., Serrano López, A., Shankar, A., &#38; Varma, I. (2026). Counting number fields
    of fixed degree by their smallest defining polynomial. In <i>arXiv:2602.06943</i>.
  bibtex: '@article{Arango-Piñeros_Gundlach_Lemke Oliver_McGown_Sawin_Serrano López_Shankar_Varma_2026,
    title={Counting number fields of fixed degree by their smallest defining polynomial},
    journal={arXiv:2602.06943}, author={Arango-Piñeros, Santiago and Gundlach, Fabian
    and Lemke Oliver, Robert J. and McGown, Kevin J. and Sawin, Will and Serrano López,
    Allechar and Shankar, Arul and Varma, Ila}, year={2026} }'
  chicago: Arango-Piñeros, Santiago, Fabian Gundlach, Robert J. Lemke Oliver, Kevin
    J. McGown, Will Sawin, Allechar Serrano López, Arul Shankar, and Ila Varma. “Counting
    Number Fields of Fixed Degree by Their Smallest Defining Polynomial.” <i>ArXiv:2602.06943</i>,
    2026.
  ieee: S. Arango-Piñeros <i>et al.</i>, “Counting number fields of fixed degree by
    their smallest defining polynomial,” <i>arXiv:2602.06943</i>. 2026.
  mla: Arango-Piñeros, Santiago, et al. “Counting Number Fields of Fixed Degree by
    Their Smallest Defining Polynomial.” <i>ArXiv:2602.06943</i>, 2026.
  short: S. Arango-Piñeros, F. Gundlach, R.J. Lemke Oliver, K.J. McGown, W. Sawin,
    A. Serrano López, A. Shankar, I. Varma, ArXiv:2602.06943 (2026).
date_created: 2026-02-09T07:48:05Z
date_updated: 2026-02-09T07:49:17Z
external_id:
  arxiv:
  - '2602.06943'
language:
- iso: eng
publication: arXiv:2602.06943
status: public
title: Counting number fields of fixed degree by their smallest defining polynomial
type: preprint
user_id: '100450'
year: '2026'
...
---
_id: '63835'
abstract:
- lang: eng
  text: This article examines the liquidity effects of a wealth tax on residential
    rental real estate. Using data from a real estate corporation, we simulate the
    effects of a wealth tax on cash flows from the rental operations. The level of
    detail of the data enables us to conduct analyses at the annual, regional and
    year of construction level. A comparison with real estate data from other sources
    supports external validity. The results of the simulation show that the introduction
    of a wealth tax can significantly reduce the cash flow from rental operations
    and lead to liquidity problems. On average over all observations, a wealth tax
    rate of 2% leads to a negative cash flow after all costs. In general, this finding
    implies that growth-oriented real estate is more affected by a wealth tax in terms
    of liquidity than rental yield-oriented real estate. Particularly in large cities
    with high market values but relatively low rents, the liquidity effects can be
    more than three times as high as in rural or industrial regions – potentially
    leading to a relative loss of investment attractiveness. As a wealth tax is decoupled
    from rental income, the tax burden is very sensitive to market developments, including
    the interest rate environment. As a result, investments in residential rental
    real estate are exposed to additional uncertainty. This additional tax uncertainty
    might impair the willingness to invest and should therefore be taken into account
    in political discussions on the reintroduction of a wealth tax.
author:
- first_name: Ralf
  full_name: Maiterth, Ralf
  last_name: Maiterth
- first_name: Yuri
  full_name: Piper, Yuri
  id: '49955'
  last_name: Piper
- first_name: Caren
  full_name: Sureth-Sloane, Caren
  id: '530'
  last_name: Sureth-Sloane
  orcid: ' 0000-0002-8183-5901'
citation:
  ama: Maiterth R, Piper Y, Sureth-Sloane C. <i>Liquidity Effects of a Wealth Tax
    on Residential Rental Real Estate</i>.; 2026. doi:<a href="https://doi.org/10.2139/ssrn.6147767">10.2139/ssrn.6147767</a>
  apa: Maiterth, R., Piper, Y., &#38; Sureth-Sloane, C. (2026). <i>Liquidity Effects
    of a Wealth Tax on Residential Rental Real Estate</i>. <a href="https://doi.org/10.2139/ssrn.6147767">https://doi.org/10.2139/ssrn.6147767</a>
  bibtex: '@book{Maiterth_Piper_Sureth-Sloane_2026, series={TRR 266 Accounting for
    Transparency Working Paper Series No. 221}, title={Liquidity Effects of a Wealth
    Tax on Residential Rental Real Estate}, DOI={<a href="https://doi.org/10.2139/ssrn.6147767">10.2139/ssrn.6147767</a>},
    author={Maiterth, Ralf and Piper, Yuri and Sureth-Sloane, Caren}, year={2026},
    collection={TRR 266 Accounting for Transparency Working Paper Series No. 221}
    }'
  chicago: Maiterth, Ralf, Yuri Piper, and Caren Sureth-Sloane. <i>Liquidity Effects
    of a Wealth Tax on Residential Rental Real Estate</i>. TRR 266 Accounting for
    Transparency Working Paper Series No. 221, 2026. <a href="https://doi.org/10.2139/ssrn.6147767">https://doi.org/10.2139/ssrn.6147767</a>.
  ieee: R. Maiterth, Y. Piper, and C. Sureth-Sloane, <i>Liquidity Effects of a Wealth
    Tax on Residential Rental Real Estate</i>. 2026.
  mla: Maiterth, Ralf, et al. <i>Liquidity Effects of a Wealth Tax on Residential
    Rental Real Estate</i>. 2026, doi:<a href="https://doi.org/10.2139/ssrn.6147767">10.2139/ssrn.6147767</a>.
  short: R. Maiterth, Y. Piper, C. Sureth-Sloane, Liquidity Effects of a Wealth Tax
    on Residential Rental Real Estate, 2026.
date_created: 2026-02-02T13:38:29Z
date_updated: 2026-02-09T11:18:25Z
department:
- _id: '187'
doi: 10.2139/ssrn.6147767
jel:
- H22
- H23
- H24
- R31
language:
- iso: eng
publication_status: published
series_title: TRR 266 Accounting for Transparency Working Paper Series No. 221
status: public
title: Liquidity Effects of a Wealth Tax on Residential Rental Real Estate
type: working_paper
user_id: '96670'
year: '2026'
...
---
_id: '64075'
author:
- first_name: Lynn
  full_name: Humpert, Lynn
  last_name: Humpert
- first_name: Jannis
  full_name: Graunke, Jannis
  last_name: Graunke
- first_name: Gerrit
  full_name: Cichon, Gerrit
  last_name: Cichon
- first_name: Anuradha
  full_name: Ammanagi, Anuradha
  last_name: Ammanagi
- first_name: Anja
  full_name: Schierbaum, Anja
  last_name: Schierbaum
- first_name: Roman
  full_name: Dumitrescu, Roman
  id: '16190'
  last_name: Dumitrescu
citation:
  ama: 'Humpert L, Graunke J, Cichon G, Ammanagi A, Schierbaum A, Dumitrescu R. Generative
    AI in Systems Engineering: Automated Creation of System Architectures and Early-Stage
    Calculation in the B2B Sector. In: <i>2025 IEEE International Symposium on Systems
    Engineering (ISSE)</i>. IEEE; 2026. doi:<a href="https://doi.org/10.1109/isse65546.2025.11370000">10.1109/isse65546.2025.11370000</a>'
  apa: 'Humpert, L., Graunke, J., Cichon, G., Ammanagi, A., Schierbaum, A., &#38;
    Dumitrescu, R. (2026). Generative AI in Systems Engineering: Automated Creation
    of System Architectures and Early-Stage Calculation in the B2B Sector. <i>2025
    IEEE International Symposium on Systems Engineering (ISSE)</i>. <a href="https://doi.org/10.1109/isse65546.2025.11370000">https://doi.org/10.1109/isse65546.2025.11370000</a>'
  bibtex: '@inproceedings{Humpert_Graunke_Cichon_Ammanagi_Schierbaum_Dumitrescu_2026,
    title={Generative AI in Systems Engineering: Automated Creation of System Architectures
    and Early-Stage Calculation in the B2B Sector}, DOI={<a href="https://doi.org/10.1109/isse65546.2025.11370000">10.1109/isse65546.2025.11370000</a>},
    booktitle={2025 IEEE International Symposium on Systems Engineering (ISSE)}, publisher={IEEE},
    author={Humpert, Lynn and Graunke, Jannis and Cichon, Gerrit and Ammanagi, Anuradha
    and Schierbaum, Anja and Dumitrescu, Roman}, year={2026} }'
  chicago: 'Humpert, Lynn, Jannis Graunke, Gerrit Cichon, Anuradha Ammanagi, Anja
    Schierbaum, and Roman Dumitrescu. “Generative AI in Systems Engineering: Automated
    Creation of System Architectures and Early-Stage Calculation in the B2B Sector.”
    In <i>2025 IEEE International Symposium on Systems Engineering (ISSE)</i>. IEEE,
    2026. <a href="https://doi.org/10.1109/isse65546.2025.11370000">https://doi.org/10.1109/isse65546.2025.11370000</a>.'
  ieee: 'L. Humpert, J. Graunke, G. Cichon, A. Ammanagi, A. Schierbaum, and R. Dumitrescu,
    “Generative AI in Systems Engineering: Automated Creation of System Architectures
    and Early-Stage Calculation in the B2B Sector,” 2026, doi: <a href="https://doi.org/10.1109/isse65546.2025.11370000">10.1109/isse65546.2025.11370000</a>.'
  mla: 'Humpert, Lynn, et al. “Generative AI in Systems Engineering: Automated Creation
    of System Architectures and Early-Stage Calculation in the B2B Sector.” <i>2025
    IEEE International Symposium on Systems Engineering (ISSE)</i>, IEEE, 2026, doi:<a
    href="https://doi.org/10.1109/isse65546.2025.11370000">10.1109/isse65546.2025.11370000</a>.'
  short: 'L. Humpert, J. Graunke, G. Cichon, A. Ammanagi, A. Schierbaum, R. Dumitrescu,
    in: 2025 IEEE International Symposium on Systems Engineering (ISSE), IEEE, 2026.'
date_created: 2026-02-09T14:52:15Z
date_updated: 2026-02-09T14:52:40Z
department:
- _id: '563'
doi: 10.1109/isse65546.2025.11370000
language:
- iso: eng
publication: 2025 IEEE International Symposium on Systems Engineering (ISSE)
publication_status: published
publisher: IEEE
status: public
title: 'Generative AI in Systems Engineering: Automated Creation of System Architectures
  and Early-Stage Calculation in the B2B Sector'
type: conference
user_id: '15782'
year: '2026'
...
---
_id: '64072'
author:
- first_name: Stefanie
  full_name: Vochatzer, Stefanie
  id: '95153'
  last_name: Vochatzer
- first_name: Sophia
  full_name: Schorr, Sophia
  last_name: Schorr
- first_name: 'Daniel '
  full_name: 'Lieb, Daniel '
  last_name: Lieb
- first_name: 'Leah '
  full_name: 'Stange, Leah '
  last_name: Stange
- first_name: Anna Maria
  full_name: Kamenik , Anna Maria
  last_name: 'Kamenik '
citation:
  ama: 'Vochatzer S, Schorr S, Lieb D, Stange L, Kamenik  AM. Von der partizipativen
    Forschung zum Empowerment. Eine methodologische Bestimmung kollaborativer Autoethnografie
    . In: Schär C, Schnurr S, Berner H, et al., eds. <i>Partizipative Forschung Und
    Empowerment - Erkundungen in Feldern Der Sozialen Arbeit </i>. Beltz Juventa ;
    2026:123-136.'
  apa: Vochatzer, S., Schorr, S., Lieb, D., Stange, L., &#38; Kamenik , A. M. (2026).
    Von der partizipativen Forschung zum Empowerment. Eine methodologische Bestimmung
    kollaborativer Autoethnografie . In C. Schär, S. Schnurr, H. Berner, F. Eßer,
    E. Richter, D. Rosenlecherner-Urbanek, &#38; W. Schröer (Eds.), <i>Partizipative
    Forschung und Empowerment - Erkundungen in Feldern der Sozialen Arbeit </i> (pp.
    123–136). Beltz Juventa .
  bibtex: '@inbook{Vochatzer_Schorr_Lieb_Stange_Kamenik _2026, place={Weinheim },
    title={Von der partizipativen Forschung zum Empowerment. Eine methodologische
    Bestimmung kollaborativer Autoethnografie }, booktitle={Partizipative Forschung
    und Empowerment - Erkundungen in Feldern der Sozialen Arbeit }, publisher={Beltz
    Juventa }, author={Vochatzer, Stefanie and Schorr, Sophia and Lieb, Daniel  and
    Stange, Leah  and Kamenik , Anna Maria}, editor={Schär, Clarissa  and Schnurr,
    Stefan and Berner, Heiko and Eßer, Florian  and Richter, Elisabeth  and Rosenlecherner-Urbanek,
    Doris and Schröer, Wolfgang}, year={2026}, pages={123–136} }'
  chicago: 'Vochatzer, Stefanie, Sophia Schorr, Daniel  Lieb, Leah  Stange, and Anna
    Maria Kamenik . “Von Der Partizipativen Forschung Zum Empowerment. Eine Methodologische
    Bestimmung Kollaborativer Autoethnografie .” In <i>Partizipative Forschung Und
    Empowerment - Erkundungen in Feldern Der Sozialen Arbeit </i>, edited by Clarissa  Schär,
    Stefan Schnurr, Heiko Berner, Florian  Eßer, Elisabeth  Richter, Doris Rosenlecherner-Urbanek,
    and Wolfgang Schröer, 123–36. Weinheim : Beltz Juventa , 2026.'
  ieee: 'S. Vochatzer, S. Schorr, D. Lieb, L. Stange, and A. M. Kamenik , “Von der
    partizipativen Forschung zum Empowerment. Eine methodologische Bestimmung kollaborativer
    Autoethnografie ,” in <i>Partizipative Forschung und Empowerment - Erkundungen
    in Feldern der Sozialen Arbeit </i>, C. Schär, S. Schnurr, H. Berner, F. Eßer,
    E. Richter, D. Rosenlecherner-Urbanek, and W. Schröer, Eds. Weinheim : Beltz Juventa
    , 2026, pp. 123–136.'
  mla: Vochatzer, Stefanie, et al. “Von Der Partizipativen Forschung Zum Empowerment.
    Eine Methodologische Bestimmung Kollaborativer Autoethnografie .” <i>Partizipative
    Forschung Und Empowerment - Erkundungen in Feldern Der Sozialen Arbeit </i>, edited
    by Clarissa  Schär et al., Beltz Juventa , 2026, pp. 123–36.
  short: 'S. Vochatzer, S. Schorr, D. Lieb, L. Stange, A.M. Kamenik , in: C. Schär,
    S. Schnurr, H. Berner, F. Eßer, E. Richter, D. Rosenlecherner-Urbanek, W. Schröer
    (Eds.), Partizipative Forschung Und Empowerment - Erkundungen in Feldern Der Sozialen
    Arbeit , Beltz Juventa , Weinheim , 2026, pp. 123–136.'
date_created: 2026-02-09T10:51:05Z
date_updated: 2026-02-09T10:51:15Z
editor:
- first_name: 'Clarissa '
  full_name: 'Schär, Clarissa '
  last_name: Schär
- first_name: Stefan
  full_name: Schnurr, Stefan
  last_name: Schnurr
- first_name: Heiko
  full_name: Berner, Heiko
  last_name: Berner
- first_name: 'Florian '
  full_name: 'Eßer, Florian '
  last_name: Eßer
- first_name: 'Elisabeth '
  full_name: 'Richter, Elisabeth '
  last_name: Richter
- first_name: Doris
  full_name: Rosenlecherner-Urbanek, Doris
  last_name: Rosenlecherner-Urbanek
- first_name: Wolfgang
  full_name: Schröer, Wolfgang
  last_name: Schröer
language:
- iso: eng
page: 123-136
place: 'Weinheim '
publication: 'Partizipative Forschung und Empowerment - Erkundungen in Feldern der
  Sozialen Arbeit '
publisher: 'Beltz Juventa '
status: public
title: 'Von der partizipativen Forschung zum Empowerment. Eine methodologische Bestimmung
  kollaborativer Autoethnografie '
type: book_chapter
user_id: '95153'
year: '2026'
...
