---
_id: '65316'
abstract:
- lang: eng
text: Metasurfaces are powerful tools for manipulating light using small structures
on the nanoscale. In most metasurfaces, near-field couplings are treated as being
unfavorable perturbations. Here, we experimentally investigate a structure consisting
of sinusoidally modulated silicon waveguides where near-field coupling of local
resonances leads to negative coupling, i.e., a negative coupling constant. This
gives rise to wave-vector-dependent eigenstates of elliptical, linear, and circular
polarizations. In particular, fully circular polarization states are not only
present at a single point in momentum space (k-space) but also along a line. This
circular polarization line, as well as a linear polarization line, emanates from
a polarization degeneracy at the Dirac point. We experimentally validate the existence
of these eigenstates and demonstrate the energy-, polarization-, and wave vector
dependence of this metasurface as well as its sensitivity to fabrication tolerances.
By tuning the incident k-vector, certain polarization-energy eigenstates are strongly
reflected, allowing for uses in angle-tunable polarization filters and light sources.
author:
- first_name: Helene
full_name: Wetter, Helene
last_name: Wetter
- first_name: Jan
full_name: Wingenbach, Jan
id: '69187'
last_name: Wingenbach
- first_name: Falk
full_name: Rehberg, Falk
last_name: Rehberg
- first_name: Wenlong
full_name: Gao, Wenlong
last_name: Gao
- first_name: Stefan
full_name: Schumacher, Stefan
id: '27271'
last_name: Schumacher
orcid: 0000-0003-4042-4951
- first_name: Thomas
full_name: Zentgraf, Thomas
id: '30525'
last_name: Zentgraf
orcid: 0000-0002-8662-1101
citation:
ama: Wetter H, Wingenbach J, Rehberg F, Gao W, Schumacher S, Zentgraf T. Polarization-
and Wave-Vector Selective Optical Metasurface with Near-Field Coupling. ACS
Photonics. 2026;13:2128-2133. doi:10.1021/acsphotonics.5c02865
apa: Wetter, H., Wingenbach, J., Rehberg, F., Gao, W., Schumacher, S., & Zentgraf,
T. (2026). Polarization- and Wave-Vector Selective Optical Metasurface with Near-Field
Coupling. ACS Photonics, 13, 2128–2133. https://doi.org/10.1021/acsphotonics.5c02865
bibtex: '@article{Wetter_Wingenbach_Rehberg_Gao_Schumacher_Zentgraf_2026, title={Polarization-
and Wave-Vector Selective Optical Metasurface with Near-Field Coupling}, volume={13},
DOI={10.1021/acsphotonics.5c02865},
journal={ACS Photonics}, publisher={American Chemical Society (ACS)}, author={Wetter,
Helene and Wingenbach, Jan and Rehberg, Falk and Gao, Wenlong and Schumacher,
Stefan and Zentgraf, Thomas}, year={2026}, pages={2128–2133} }'
chicago: 'Wetter, Helene, Jan Wingenbach, Falk Rehberg, Wenlong Gao, Stefan Schumacher,
and Thomas Zentgraf. “Polarization- and Wave-Vector Selective Optical Metasurface
with Near-Field Coupling.” ACS Photonics 13 (2026): 2128–33. https://doi.org/10.1021/acsphotonics.5c02865.'
ieee: 'H. Wetter, J. Wingenbach, F. Rehberg, W. Gao, S. Schumacher, and T. Zentgraf,
“Polarization- and Wave-Vector Selective Optical Metasurface with Near-Field Coupling,”
ACS Photonics, vol. 13, pp. 2128–2133, 2026, doi: 10.1021/acsphotonics.5c02865.'
mla: Wetter, Helene, et al. “Polarization- and Wave-Vector Selective Optical Metasurface
with Near-Field Coupling.” ACS Photonics, vol. 13, American Chemical Society
(ACS), 2026, pp. 2128–33, doi:10.1021/acsphotonics.5c02865.
short: H. Wetter, J. Wingenbach, F. Rehberg, W. Gao, S. Schumacher, T. Zentgraf,
ACS Photonics 13 (2026) 2128–2133.
date_created: 2026-04-02T07:25:30Z
date_updated: 2026-04-20T05:09:57Z
department:
- _id: '15'
- _id: '230'
- _id: '289'
- _id: '623'
doi: 10.1021/acsphotonics.5c02865
external_id:
arxiv:
- '2512.14452'
intvolume: ' 13'
keyword:
- metasurface
- waveguides
- Dirac point
- polarization
- negative coupling
language:
- iso: eng
main_file_link:
- url: https://pubs.acs.org/doi/10.1021/acsphotonics.5c02865
page: 2128-2133
publication: ACS Photonics
publication_identifier:
issn:
- 2330-4022
- 2330-4022
publication_status: published
publisher: American Chemical Society (ACS)
quality_controlled: '1'
status: public
title: Polarization- and Wave-Vector Selective Optical Metasurface with Near-Field
Coupling
type: journal_article
user_id: '30525'
volume: 13
year: '2026'
...
---
_id: '62079'
abstract:
- lang: eng
text: This paper investigates two modeling approaches for the simulation of the
deformation and decomposition behavior of preconsolidated rovings above the thermoplastic
matrix{\textquoteright} melting temperature. This is crucial for capturing the
local material structure after processes introducing highly localized deformation
such as mechanical joining processes between metal and fiber reinforced thermoplastics
(FRTP). A generic finite element (FE) model is developed, incorporating interfaces
discretized through either cohesive zone (CZ) elements or Coulomb friction-based
contacts. The material parameters for the FE elements are derived from the initial
stiffness of a statistical volume element (SVE) at micro scale modelled with an
Arbitrary-Lagrange-Eulerian method for three load cases. The CZ properties calculated
are based on the shear viscosity of the composite. The CZ and contact modelling
approaches are evaluated using three load cases of the SVE, comparing force-displacement
curves. Under simple loading conditions, such as normal pressure tension and bending,
both methods produce similar results; however, in complex load cases, the CZ approach
shows clear advantages in handling interface interactions and shows robust simulations.
The CZ approach thus presents a promising method for simulating roving decomposition
in FRTP-metal joining applications above the matrix{\textquoteright} melting temperature.
author:
- first_name: Benjamin
full_name: Gröger, Benjamin
last_name: Gröger
- first_name: Johannes
full_name: Gerritzen, Johannes
id: '105344'
last_name: Gerritzen
orcid: 0000-0002-0169-8602
- first_name: Andreas
full_name: Hornig, Andreas
last_name: Hornig
- first_name: Maik
full_name: Gude, Maik
last_name: Gude
citation:
ama: 'Gröger B, Gerritzen J, Hornig A, Gude M. Modeling approaches for the decomposition
behavior of preconsolidated rovings throughout local deformation processes. In:
Meschut G, Bobbert M, Duflou J, et al., eds. Sheet Metal 2025. Materials
Research Proceedings. Materials Research Forum LLC, Materials Research Foundations;
2025:268–275. doi:10.21741/9781644903551-33'
apa: Gröger, B., Gerritzen, J., Hornig, A., & Gude, M. (2025). Modeling approaches
for the decomposition behavior of preconsolidated rovings throughout local deformation
processes. In G. Meschut, M. Bobbert, J. Duflou, L. Fratini, H. Hagenah, P. Martins,
M. Merklein, & F. Micari (Eds.), Sheet Metal 2025 (pp. 268–275). Materials
Research Forum LLC, Materials Research Foundations. https://doi.org/10.21741/9781644903551-33
bibtex: '@inproceedings{Gröger_Gerritzen_Hornig_Gude_2025, series={Materials Research
Proceedings}, title={Modeling approaches for the decomposition behavior of preconsolidated
rovings throughout local deformation processes}, DOI={10.21741/9781644903551-33},
booktitle={Sheet Metal 2025}, publisher={Materials Research Forum LLC, Materials
Research Foundations}, author={Gröger, Benjamin and Gerritzen, Johannes and Hornig,
Andreas and Gude, Maik}, editor={Meschut, G. and Bobbert, M. and Duflou, J. and
Fratini, L. and Hagenah, H. and Martins, P. and Merklein, M. and Micari, F.},
year={2025}, pages={268–275}, collection={Materials Research Proceedings} }'
chicago: Gröger, Benjamin, Johannes Gerritzen, Andreas Hornig, and Maik Gude. “Modeling
Approaches for the Decomposition Behavior of Preconsolidated Rovings throughout
Local Deformation Processes.” In Sheet Metal 2025, edited by G. Meschut,
M. Bobbert, J. Duflou, L. Fratini, H. Hagenah, P. Martins, M. Merklein, and F.
Micari, 268–275. Materials Research Proceedings. Materials Research Forum LLC,
Materials Research Foundations, 2025. https://doi.org/10.21741/9781644903551-33.
ieee: 'B. Gröger, J. Gerritzen, A. Hornig, and M. Gude, “Modeling approaches for
the decomposition behavior of preconsolidated rovings throughout local deformation
processes,” in Sheet Metal 2025, 2025, pp. 268–275, doi: 10.21741/9781644903551-33.'
mla: Gröger, Benjamin, et al. “Modeling Approaches for the Decomposition Behavior
of Preconsolidated Rovings throughout Local Deformation Processes.” Sheet Metal
2025, edited by G. Meschut et al., Materials Research Forum LLC, Materials
Research Foundations, 2025, pp. 268–275, doi:10.21741/9781644903551-33.
short: 'B. Gröger, J. Gerritzen, A. Hornig, M. Gude, in: G. Meschut, M. Bobbert,
J. Duflou, L. Fratini, H. Hagenah, P. Martins, M. Merklein, F. Micari (Eds.),
Sheet Metal 2025, Materials Research Forum LLC, Materials Research Foundations,
2025, pp. 268–275.'
date_created: 2025-11-04T12:48:21Z
date_updated: 2026-02-27T06:43:19Z
doi: 10.21741/9781644903551-33
editor:
- first_name: G.
full_name: Meschut, G.
last_name: Meschut
- first_name: M.
full_name: Bobbert, M.
last_name: Bobbert
- first_name: J.
full_name: Duflou, J.
last_name: Duflou
- first_name: L.
full_name: Fratini, L.
last_name: Fratini
- first_name: H.
full_name: Hagenah, H.
last_name: Hagenah
- first_name: P.
full_name: Martins, P.
last_name: Martins
- first_name: M.
full_name: Merklein, M.
last_name: Merklein
- first_name: F.
full_name: Micari, F.
last_name: Micari
keyword:
- Finite Element Method (FEM)
- Process
- Thermoplastic Fiber Reinforced Plastic
language:
- iso: eng
page: 268–275
project:
- _id: '130'
name: 'TRR 285: Methodenentwicklung zur mechanischen Fügbarkeit in wandlungsfähigen
Prozessketten'
- _id: '137'
name: TRR 285 - Subproject A03
- _id: '131'
name: TRR 285 - Project Area A
publication: Sheet Metal 2025
publication_identifier:
isbn:
- 978-1-64490-354-4
publisher: Materials Research Forum LLC, Materials Research Foundations
series_title: Materials Research Proceedings
status: public
title: Modeling approaches for the decomposition behavior of preconsolidated rovings
throughout local deformation processes
type: conference
user_id: '105344'
year: '2025'
...
---
_id: '54847'
abstract:
- lang: eng
text: The widespread adoption of ultra-high strength steels, due to their high bulk
resistivity, intensifies expulsion issues in resistance spot welding (RSW), deteriorating
both the spot weld and surface quality. This study presents a novel approach to
prevent expulsion by employing a preheating current. Through characteristic analysis
of joint formation under critical welding current, the importance of plastic material
encapsulation around the weld nugget (plastic shell) at high temperatures in preventing
expulsion is highlighted. To evaluate the effect of preheating on the plastic
shell and understand its mechanism in expulsion prevention, a two-dimensional
welding simulation model for dissimilar ultra-high strength steel joints was established.
The results showed that optimal preheating enhances the thickness of the plastic
shell, improving its ability to encapsulate the weld nugget during the primary
welding phase, thereby diminishing expulsion risks. Experimental validation confirmed
that by employing the optimal preheating current, the maximum nugget diameter
was enhanced to 9.42 mm, marking an increase of 13.4 % and extending the weldable
current range by 27.5 %. Under quasi-static cross-tensile loading, joints with
preheating demonstrated a 7.9 % enhancement in maximum load-bearing capacity compared
to joints without preheating, showing a reproducible and complete pull-out failure
mode within the heat-affected zone. This study offers a prevention method based
on underlying mechanisms, providing a new perspective for future research on welding
parameter optimization with the aim of expulsion prevention.
article_type: original
author:
- first_name: Keke
full_name: Yang, Keke
id: '65085'
last_name: Yang
orcid: 0000-0001-9201-9304
- first_name: Bassel
full_name: El-Sari, Bassel
last_name: El-Sari
- first_name: Viktoria
full_name: Olfert, Viktoria
id: '5974'
last_name: Olfert
- first_name: Zhuoqun
full_name: Wang, Zhuoqun
last_name: Wang
- first_name: Max
full_name: Biegler, Max
last_name: Biegler
- first_name: Michael
full_name: Rethmeier, Michael
last_name: Rethmeier
- first_name: Gerson
full_name: Meschut, Gerson
id: '32056'
last_name: Meschut
orcid: 0000-0002-2763-1246
citation:
ama: 'Yang K, El-Sari B, Olfert V, et al. Expulsion prevention in resistance spot
welding of dissimilar joints with ultra-high strength steel: An analysis of the
mechanism and effect of preheating current. Journal of Manufacturing Processes.
2024;124:489-502. doi:10.1016/j.jmapro.2024.06.034'
apa: 'Yang, K., El-Sari, B., Olfert, V., Wang, Z., Biegler, M., Rethmeier, M., &
Meschut, G. (2024). Expulsion prevention in resistance spot welding of dissimilar
joints with ultra-high strength steel: An analysis of the mechanism and effect
of preheating current. Journal of Manufacturing Processes, 124,
489–502. https://doi.org/10.1016/j.jmapro.2024.06.034'
bibtex: '@article{Yang_El-Sari_Olfert_Wang_Biegler_Rethmeier_Meschut_2024, title={Expulsion
prevention in resistance spot welding of dissimilar joints with ultra-high strength
steel: An analysis of the mechanism and effect of preheating current}, volume={124},
DOI={10.1016/j.jmapro.2024.06.034},
journal={Journal of Manufacturing Processes}, publisher={Elsevier BV}, author={Yang,
Keke and El-Sari, Bassel and Olfert, Viktoria and Wang, Zhuoqun and Biegler, Max
and Rethmeier, Michael and Meschut, Gerson}, year={2024}, pages={489–502} }'
chicago: 'Yang, Keke, Bassel El-Sari, Viktoria Olfert, Zhuoqun Wang, Max Biegler,
Michael Rethmeier, and Gerson Meschut. “Expulsion Prevention in Resistance Spot
Welding of Dissimilar Joints with Ultra-High Strength Steel: An Analysis of the
Mechanism and Effect of Preheating Current.” Journal of Manufacturing Processes
124 (2024): 489–502. https://doi.org/10.1016/j.jmapro.2024.06.034.'
ieee: 'K. Yang et al., “Expulsion prevention in resistance spot welding of
dissimilar joints with ultra-high strength steel: An analysis of the mechanism
and effect of preheating current,” Journal of Manufacturing Processes,
vol. 124, pp. 489–502, 2024, doi: 10.1016/j.jmapro.2024.06.034.'
mla: 'Yang, Keke, et al. “Expulsion Prevention in Resistance Spot Welding of Dissimilar
Joints with Ultra-High Strength Steel: An Analysis of the Mechanism and Effect
of Preheating Current.” Journal of Manufacturing Processes, vol. 124, Elsevier
BV, 2024, pp. 489–502, doi:10.1016/j.jmapro.2024.06.034.'
short: K. Yang, B. El-Sari, V. Olfert, Z. Wang, M. Biegler, M. Rethmeier, G. Meschut,
Journal of Manufacturing Processes 124 (2024) 489–502.
date_created: 2024-06-23T21:58:29Z
date_updated: 2024-10-18T06:59:27Z
ddc:
- '670'
department:
- _id: '157'
doi: 10.1016/j.jmapro.2024.06.034
file:
- access_level: closed
content_type: application/pdf
creator: kekeyang
date_created: 2024-06-23T21:59:20Z
date_updated: 2024-06-23T21:59:20Z
file_id: '54848'
file_name: 1-s2.0-S1526612524006145-main.pdf
file_size: 12432409
relation: main_file
success: 1
file_date_updated: 2024-06-23T21:59:20Z
has_accepted_license: '1'
intvolume: ' 124'
keyword:
- Expulsion Resistance spot welding Finite element modelling Preheating Weldable current
range Ultra-high strength steel
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://www.sciencedirect.com/science/article/pii/S1526612524006145
oa: '1'
page: 489-502
publication: Journal of Manufacturing Processes
publication_identifier:
issn:
- 1526-6125
publication_status: published
publisher: Elsevier BV
quality_controlled: '1'
status: public
title: 'Expulsion prevention in resistance spot welding of dissimilar joints with
ultra-high strength steel: An analysis of the mechanism and effect of preheating
current'
type: journal_article
user_id: '65085'
volume: 124
year: '2024'
...
---
_id: '61900'
abstract:
- lang: eng
text: Background Anti-Muslim and anti-Islam attitudes are widespread in contemporary
western societies. A grassroots movement of mosques tries to reduce prejudice
by organizing guided mosque tours for non-Muslims. While this is an opportunity
for intergroup contact in a social psychological sense, contact occurs under sometimes
difficult conditions. As yet, its effects have not been investigated empirically.
Objective We examine (a) whether visits have an immediate and medium-term effect
on prejudice toward Islam and (b) how they change the visitors’ subjective images
of Muslims. Methods (a) We survey N = 324 secondary school students in a three-wave
panel study in 6 guided mosque tours in different parts of Germany, including
a control sample. The tour programme was in line with common practice in the mosques.
Standardized measurements were taken immediately before and after the tour and
again several months later. (b) We asked about subjective images of Muslims and
had subjects report their spontaneous associations with the term Muslim. Results
(a) Most, but not all, mosque visits significantly alleviate anti-Islam prejudice
in the short term. The effects fall off after several months. (b) After the visit,
the image of Muslims possessed more concrete religious content, while negative
and menacing associations, such as oppression of women, threat, or so-called Islamic
State have decreased. Conclusions Outgroup contact in a mosque works as predicted
by the intergroup contact research, even under less than optimal conditions. However,
there is potential for improvement of the setup of tours in the interest of a
more sustainable impact.
author:
- first_name: Olga
full_name: Janzen, Olga
last_name: Janzen
- first_name: Isabell
full_name: Diekmann, Isabell
id: '119325'
last_name: Diekmann
- first_name: Dorian
full_name: Tsolak, Dorian
last_name: Tsolak
- first_name: Kurt
full_name: Salentin, Kurt
last_name: Salentin
citation:
ama: Janzen O, Diekmann I, Tsolak D, Salentin K. Do Guided Mosque Tours Alleviate
the Prejudice of Non-Muslims against Islam and Muslims? Evidence from a Quasi-Experimental
Panel Study from Germany. Zeitschrift für Religion, Gesellschaft und Politik.
2024;8(1):129–159. doi:10.1007/s41682-023-00161-4
apa: Janzen, O., Diekmann, I., Tsolak, D., & Salentin, K. (2024). Do Guided
Mosque Tours Alleviate the Prejudice of Non-Muslims against Islam and Muslims?
Evidence from a Quasi-Experimental Panel Study from Germany. Zeitschrift Für
Religion, Gesellschaft Und Politik, 8(1), 129–159. https://doi.org/10.1007/s41682-023-00161-4
bibtex: '@article{Janzen_Diekmann_Tsolak_Salentin_2024, title={Do Guided Mosque
Tours Alleviate the Prejudice of Non-Muslims against Islam and Muslims? Evidence
from a Quasi-Experimental Panel Study from Germany}, volume={8}, DOI={10.1007/s41682-023-00161-4},
number={1}, journal={Zeitschrift für Religion, Gesellschaft und Politik}, publisher={Springer
VS}, author={Janzen, Olga and Diekmann, Isabell and Tsolak, Dorian and Salentin,
Kurt}, year={2024}, pages={129–159} }'
chicago: 'Janzen, Olga, Isabell Diekmann, Dorian Tsolak, and Kurt Salentin. “Do
Guided Mosque Tours Alleviate the Prejudice of Non-Muslims against Islam and Muslims?
Evidence from a Quasi-Experimental Panel Study from Germany.” Zeitschrift Für
Religion, Gesellschaft Und Politik 8, no. 1 (2024): 129–159. https://doi.org/10.1007/s41682-023-00161-4.'
ieee: 'O. Janzen, I. Diekmann, D. Tsolak, and K. Salentin, “Do Guided Mosque Tours
Alleviate the Prejudice of Non-Muslims against Islam and Muslims? Evidence from
a Quasi-Experimental Panel Study from Germany,” Zeitschrift für Religion, Gesellschaft
und Politik, vol. 8, no. 1, pp. 129–159, 2024, doi: 10.1007/s41682-023-00161-4.'
mla: Janzen, Olga, et al. “Do Guided Mosque Tours Alleviate the Prejudice of Non-Muslims
against Islam and Muslims? Evidence from a Quasi-Experimental Panel Study from
Germany.” Zeitschrift Für Religion, Gesellschaft Und Politik, vol. 8, no.
1, Springer VS, 2024, pp. 129–159, doi:10.1007/s41682-023-00161-4.
short: O. Janzen, I. Diekmann, D. Tsolak, K. Salentin, Zeitschrift Für Religion,
Gesellschaft Und Politik 8 (2024) 129–159.
date_created: 2025-10-21T11:21:41Z
date_updated: 2025-10-21T12:09:06Z
doi: 10.1007/s41682-023-00161-4
extern: '1'
intvolume: ' 8'
issue: '1'
keyword:
- Intergroup contact
- Anti-Islam attitudes
- Anti-Muslim attitudes
- Prejudice
- Youth
language:
- iso: eng
page: ' 129–159'
publication: Zeitschrift für Religion, Gesellschaft und Politik
publication_identifier:
issn:
- 2510-1226
publisher: Springer VS
status: public
title: Do Guided Mosque Tours Alleviate the Prejudice of Non-Muslims against Islam
and Muslims? Evidence from a Quasi-Experimental Panel Study from Germany
type: journal_article
user_id: '119325'
volume: 8
year: '2024'
...
---
_id: '50479'
abstract:
- lang: eng
text: Verifying assertions is an essential part of creating and maintaining knowledge
graphs. Most often, this task cannot be carried out manually due to the sheer
size of modern knowledge graphs. Hence, automatic fact-checking approaches have
been proposed over the last decade. These approaches aim to compute automatically
whether a given assertion is correct or incorrect. However, most fact-checking
approaches are binary classifiers that fail to consider the volatility of some
assertions, i.e., the fact that such assertions are only valid at certain times
or for specific time intervals. Moreover, the few approaches able to predict when
an assertion was valid (i.e., time-point prediction approaches) rely on manual
feature engineering. This paper presents TEMPORALFC, a temporal fact-checking
approach that uses multiple sources of background knowledge to assess the veracity
and temporal validity of a given assertion. We evaluate TEMPORALFC on two datasets
and compare it to the state of the art in fact-checking and time-point prediction.
Our results suggest that TEMPORALFC outperforms the state of the art on the fact-checking
task by 0.13 to 0.15 in terms of Area Under the Receiver Operating Characteristic
curve and on the time-point prediction task by 0.25 to 0.27 in terms of Mean Reciprocal
Rank. Our code is open-source and can be found at https://github.com/dice-group/TemporalFC.
author:
- first_name: Umair
full_name: Qudus, Umair
last_name: Qudus
- first_name: Michael
full_name: Röder, Michael
last_name: Röder
- first_name: Sabrina
full_name: Kirrane, Sabrina
last_name: Kirrane
- first_name: Axel-Cyrille Ngonga
full_name: Ngomo, Axel-Cyrille Ngonga
last_name: Ngomo
citation:
ama: 'Qudus U, Röder M, Kirrane S, Ngomo A-CN. TemporalFC: A Temporal Fact Checking
Approach over Knowledge Graphs. In: R. Payne T, Presutti V, Qi G, et al., eds.
The Semantic Web – ISWC 2023. Vol 14265. Lecture Notes in Computer Science.
Springer, Cham; 2023:465–483. doi:10.1007/978-3-031-47240-4_25'
apa: 'Qudus, U., Röder, M., Kirrane, S., & Ngomo, A.-C. N. (2023). TemporalFC:
A Temporal Fact Checking Approach over Knowledge Graphs. In T. R. Payne, V. Presutti,
G. Qi, M. Poveda-Villalón, G. Stoilos, L. Hollink, Z. Kaoudi, G. Cheng, &
J. Li (Eds.), The Semantic Web – ISWC 2023 (Vol. 14265, pp. 465–483). Springer,
Cham. https://doi.org/10.1007/978-3-031-47240-4_25'
bibtex: '@inproceedings{Qudus_Röder_Kirrane_Ngomo_2023, place={Cham}, series={ Lecture
Notes in Computer Science}, title={TemporalFC: A Temporal Fact Checking Approach
over Knowledge Graphs}, volume={14265}, DOI={10.1007/978-3-031-47240-4_25},
booktitle={The Semantic Web – ISWC 2023}, publisher={Springer, Cham}, author={Qudus,
Umair and Röder, Michael and Kirrane, Sabrina and Ngomo, Axel-Cyrille Ngonga},
editor={R. Payne, Terry and Presutti, Valentina and Qi, Guilin and Poveda-Villalón,
María and Stoilos, Giorgos and Hollink, Laura and Kaoudi, Zoi and Cheng, Gong
and Li, Juanzi}, year={2023}, pages={465–483}, collection={ Lecture Notes in Computer
Science} }'
chicago: 'Qudus, Umair, Michael Röder, Sabrina Kirrane, and Axel-Cyrille Ngonga
Ngomo. “TemporalFC: A Temporal Fact Checking Approach over Knowledge Graphs.”
In The Semantic Web – ISWC 2023, edited by Terry R. Payne, Valentina Presutti,
Guilin Qi, María Poveda-Villalón, Giorgos Stoilos, Laura Hollink, Zoi Kaoudi,
Gong Cheng, and Juanzi Li, 14265:465–483. Lecture Notes in Computer Science.
Cham: Springer, Cham, 2023. https://doi.org/10.1007/978-3-031-47240-4_25.'
ieee: 'U. Qudus, M. Röder, S. Kirrane, and A.-C. N. Ngomo, “TemporalFC: A Temporal
Fact Checking Approach over Knowledge Graphs,” in The Semantic Web – ISWC 2023,
Athens, Greece, 2023, vol. 14265, pp. 465–483, doi: 10.1007/978-3-031-47240-4_25.'
mla: 'Qudus, Umair, et al. “TemporalFC: A Temporal Fact Checking Approach over Knowledge
Graphs.” The Semantic Web – ISWC 2023, edited by Terry R. Payne et al.,
vol. 14265, Springer, Cham, 2023, pp. 465–483, doi:10.1007/978-3-031-47240-4_25.'
short: 'U. Qudus, M. Röder, S. Kirrane, A.-C.N. Ngomo, in: T. R. Payne, V. Presutti,
G. Qi, M. Poveda-Villalón, G. Stoilos, L. Hollink, Z. Kaoudi, G. Cheng, J. Li
(Eds.), The Semantic Web – ISWC 2023, Springer, Cham, Cham, 2023, pp. 465–483.'
conference:
end_date: 2023-11-10
location: Athens, Greece
name: The Semantic Web – ISWC 2023
start_date: 2023-11-06
date_created: 2024-01-13T11:22:15Z
date_updated: 2024-01-13T11:48:28Z
ddc:
- '006'
department:
- _id: '34'
doi: 10.1007/978-3-031-47240-4_25
editor:
- first_name: Terry
full_name: R. Payne, Terry
last_name: R. Payne
- first_name: Valentina
full_name: Presutti, Valentina
last_name: Presutti
- first_name: Guilin
full_name: Qi, Guilin
last_name: Qi
- first_name: María
full_name: Poveda-Villalón, María
last_name: Poveda-Villalón
- first_name: Giorgos
full_name: Stoilos, Giorgos
last_name: Stoilos
- first_name: Laura
full_name: Hollink, Laura
last_name: Hollink
- first_name: Zoi
full_name: Kaoudi, Zoi
last_name: Kaoudi
- first_name: Gong
full_name: Cheng, Gong
last_name: Cheng
- first_name: Juanzi
full_name: Li, Juanzi
last_name: Li
file:
- access_level: closed
content_type: application/pdf
creator: uqudus
date_created: 2024-01-13T11:25:48Z
date_updated: 2024-01-13T11:25:48Z
file_id: '50480'
file_name: ISWC 2023 TemporalFC-A Temporal Fact Checking approach over Knowledge
Graphs.pdf
file_size: 1944818
relation: main_file
success: 1
file_date_updated: 2024-01-13T11:25:48Z
has_accepted_license: '1'
intvolume: ' 14265'
jel:
- C
keyword:
- temporal fact checking · ensemble learning · transfer learning · time-point prediction
· temporal knowledge graphs
language:
- iso: eng
page: 465–483
place: Cham
project:
- _id: '410'
grant_number: '860801'
name: 'KnowGraphs: KnowGraphs: Knowledge Graphs at Scale'
publication: The Semantic Web – ISWC 2023
publication_identifier:
isbn:
- '9783031472398'
- '9783031472404'
issn:
- 0302-9743
- 1611-3349
publication_status: published
publisher: Springer, Cham
series_title: ' Lecture Notes in Computer Science'
status: public
title: 'TemporalFC: A Temporal Fact Checking Approach over Knowledge Graphs'
type: conference
user_id: '83392'
volume: 14265
year: '2023'
...
---
_id: '41971'
abstract:
- lang: ger
text: "Ultraschall-Drahtbonden ist eine Standardtechnologie im Bereich der Aufbau-
und Verbindungstechnik von Leistungshalbleitermodulen. Um Prozessschritte und
damit wertvolle Zeit zu sparen, sollen die Kupferdickdrähte für die Leistungshalbleiter
auch für die Kontaktierung von eingespritzten Anschlusssteckern im Modulrahmen
verwendet werden. Das Kontaktierungsverfahren mit diesen Drähten auf Steckern
in dünnwandigen Kunststoffrahmen führt häufig zu unzureichender Bondqualität.
In dieser Arbeit wird das Bonden von Anschlusssteckern experimentell und anhand
von Simulationen untersucht, um die Prozessstabilität zu steigern.\r\n\r\nZunächst
wurden Experimente auf Untergründen mit hoher Steifigkeit durchgeführt, um Störgrößen
von Untergrundeigenschaften zu verringern. Die gewonnenen Erkenntnisse erlaubten
die Entwicklung eines Simulationsmodells für die Vorhersage der Bondqualität.
Dieses basiert auf einer flächenaufgelösten Reibarbeitsbestimmung im Fügebereich
unter Berücksichtigung des Ultraschallerweichungseffektes und der hierdurch entstehenden
hohen Drahtverformung.\r\n\r\nExperimente an den Anschlusssteckern im Modulrahmen
zeigten eine verringerte Relativverschiebung zwischen Draht und Stecker, was zu
einer deutlichen Verringerung der Reibarbeit führt. Außerdem wurden verminderte
Schwingamplituden des Bondwerkzeugs nachgewiesen. Dies führt zu einer weiteren
Reduktion der Reibarbeit. Beide Effekte wurden mithilfe eines Mehrmassenschwingers
modelliert. Die gewonnenen Erkenntnisse und die erstellten Simulationsmodelle
ermöglichen die Entwicklung von Klemmvorrichtungen, welche die identifizierten
Störgrößen gezielt kompensieren und so ein verlässliches Bonden der Anschlussstecker
im gleichen Prozessschritt ermöglichen, in dem auch die Leistungshalbleiter kontaktiert
werden."
author:
- first_name: Simon
full_name: Althoff, Simon
last_name: Althoff
citation:
ama: Althoff S. Predicting the Bond Quality of Heavy Copper Wire Bonds Using
a Friction Model Approach. Vol 15. Shaker; 2023.
apa: Althoff, S. (2023). Predicting the Bond Quality of Heavy Copper Wire Bonds
using a Friction Model Approach (Vol. 15). Shaker.
bibtex: '@book{Althoff_2023, series={Schriften des Lehrstuhls für Dynamik und Mechatronik},
title={Predicting the Bond Quality of Heavy Copper Wire Bonds using a Friction
Model Approach}, volume={15}, publisher={Shaker}, author={Althoff, Simon}, year={2023},
collection={Schriften des Lehrstuhls für Dynamik und Mechatronik} }'
chicago: Althoff, Simon. Predicting the Bond Quality of Heavy Copper Wire Bonds
Using a Friction Model Approach. Vol. 15. Schriften Des Lehrstuhls Für Dynamik
Und Mechatronik. Shaker, 2023.
ieee: S. Althoff, Predicting the Bond Quality of Heavy Copper Wire Bonds using
a Friction Model Approach, vol. 15. Shaker, 2023.
mla: Althoff, Simon. Predicting the Bond Quality of Heavy Copper Wire Bonds Using
a Friction Model Approach. Shaker, 2023.
short: S. Althoff, Predicting the Bond Quality of Heavy Copper Wire Bonds Using
a Friction Model Approach, Shaker, 2023.
date_created: 2023-02-10T13:05:19Z
date_updated: 2023-02-10T13:05:42Z
department:
- _id: '151'
extern: '1'
intvolume: ' 15'
keyword:
- heavy copper bonding
- wire bonding
- quality prediction
- friction model
- point-contact-element
language:
- iso: eng
main_file_link:
- url: https://katalog.ub.uni-paderborn.de/local/r/9925085762506463?sr[q,any]=Simon%20Althoff
page: '192'
publication_identifier:
isbn:
- 978-3-8440-8903-5
publication_status: published
publisher: Shaker
related_material:
link:
- relation: confirmation
url: https://www.shaker.de/de/content/catalogue/index.asp?lang=de&ID=8&ISBN=978-3-8440-8903-5&search=yes
series_title: Schriften des Lehrstuhls für Dynamik und Mechatronik
status: public
supervisor:
- first_name: Walter
full_name: Sextro, Walter
id: '21220'
last_name: Sextro
title: Predicting the Bond Quality of Heavy Copper Wire Bonds using a Friction Model
Approach
type: dissertation
user_id: '55222'
volume: 15
year: '2023'
...
---
_id: '33509'
abstract:
- lang: eng
text: In this publication a novel method for far-field prediction from magnetic
Huygens box data based on the boundary element method (BEM) is presented. Two
examples are considered for the validation of this method. The first example represents
an electric dipole so that the obtained calculations can be compared to an analytical
solution. As a second example, a printed circuit board is considered and the calculated
far-field is compared to a fullwave simulation. In both cases, the calculations
for different field integral equations are under comparison, and the results indicate
that the presented method performs very well with a combined field integral equation,
for the specified problem, when only magnetic Huygens box data is given.
author:
- first_name: Christoph
full_name: Marschalt, Christoph
last_name: Marschalt
- first_name: Dominik
full_name: Schroder, Dominik
last_name: Schroder
- first_name: Sven
full_name: Lange, Sven
id: '38240'
last_name: Lange
orcid: '0009-0007-9150-2266 '
- first_name: Ulrich
full_name: Hilleringmann, Ulrich
id: '20179'
last_name: Hilleringmann
- first_name: Christian
full_name: Hedayat, Christian
last_name: Hedayat
- first_name: Harald
full_name: Kuhn, Harald
last_name: Kuhn
- first_name: Denis
full_name: Sievers, Denis
last_name: Sievers
- first_name: Jens
full_name: Förstner, Jens
id: '158'
last_name: Förstner
orcid: 0000-0001-7059-9862
citation:
ama: 'Marschalt C, Schroder D, Lange S, et al. Far-field Calculation from magnetic
Huygens Box Data using the Boundary Element Method. In: 2022 Smart Systems
Integration (SSI). IEEE; 2022. doi:10.1109/ssi56489.2022.9901431'
apa: Marschalt, C., Schroder, D., Lange, S., Hilleringmann, U., Hedayat, C., Kuhn,
H., Sievers, D., & Förstner, J. (2022). Far-field Calculation from magnetic
Huygens Box Data using the Boundary Element Method. 2022 Smart Systems Integration
(SSI). 2022 Smart Systems Integration (SSI), Grenoble, France. https://doi.org/10.1109/ssi56489.2022.9901431
bibtex: '@inproceedings{Marschalt_Schroder_Lange_Hilleringmann_Hedayat_Kuhn_Sievers_Förstner_2022,
place={Grenoble, France}, title={Far-field Calculation from magnetic Huygens Box
Data using the Boundary Element Method}, DOI={10.1109/ssi56489.2022.9901431},
booktitle={2022 Smart Systems Integration (SSI)}, publisher={IEEE}, author={Marschalt,
Christoph and Schroder, Dominik and Lange, Sven and Hilleringmann, Ulrich and
Hedayat, Christian and Kuhn, Harald and Sievers, Denis and Förstner, Jens}, year={2022}
}'
chicago: 'Marschalt, Christoph, Dominik Schroder, Sven Lange, Ulrich Hilleringmann,
Christian Hedayat, Harald Kuhn, Denis Sievers, and Jens Förstner. “Far-Field Calculation
from Magnetic Huygens Box Data Using the Boundary Element Method.” In 2022
Smart Systems Integration (SSI). Grenoble, France: IEEE, 2022. https://doi.org/10.1109/ssi56489.2022.9901431.'
ieee: 'C. Marschalt et al., “Far-field Calculation from magnetic Huygens
Box Data using the Boundary Element Method,” presented at the 2022 Smart Systems
Integration (SSI), Grenoble, France, 2022, doi: 10.1109/ssi56489.2022.9901431.'
mla: Marschalt, Christoph, et al. “Far-Field Calculation from Magnetic Huygens Box
Data Using the Boundary Element Method.” 2022 Smart Systems Integration (SSI),
IEEE, 2022, doi:10.1109/ssi56489.2022.9901431.
short: 'C. Marschalt, D. Schroder, S. Lange, U. Hilleringmann, C. Hedayat, H. Kuhn,
D. Sievers, J. Förstner, in: 2022 Smart Systems Integration (SSI), IEEE, Grenoble,
France, 2022.'
conference:
end_date: 2022-04-28
location: Grenoble, France
name: 2022 Smart Systems Integration (SSI)
start_date: 2022-04-27
date_created: 2022-10-04T11:31:43Z
date_updated: 2024-11-30T19:32:14Z
department:
- _id: '59'
- _id: '61'
- _id: '485'
doi: 10.1109/ssi56489.2022.9901431
keyword:
- Near-Field Scanning
- Huygens Box
- Boundary Element Method
- Method of Moments
- tet_topic_hf
- tet_enas
language:
- iso: eng
main_file_link:
- url: https://ieeexplore.ieee.org/document/9901431
place: Grenoble, France
project:
- _id: '52'
name: 'PC2: Computing Resources Provided by the Paderborn Center for Parallel Computing'
publication: 2022 Smart Systems Integration (SSI)
publication_identifier:
eisbn:
- 978-1-6654-8849-5
publication_status: published
publisher: IEEE
status: public
title: Far-field Calculation from magnetic Huygens Box Data using the Boundary Element
Method
type: conference
user_id: '158'
year: '2022'
...
---
_id: '27652'
abstract:
- lang: ger
text: "Aufgrund der Fortschritte der Digitalisierung finden Systeme zur Zustandsüberwachung
vermehrt Einsatz in der Industrie, um durch eine zustandsbasierte oder eine prädiktive
Instandhaltung Vorteile, wie eine verbesserte Zuverlässigkeit und geringere Kosten
zu erzielen. Dabei beruhen Zustandsüberwachungssysteme auf den folgenden Bausteinen:
Sensorik, Datenvorverarbeitung, Merkmalsextraktion und -auswahl, Diagnose bzw.
Prognose sowie einer Entscheidungsfindung basierend auf den Ergebnissen. Jeder
dieser Bausteine erfordert individuelle Einstellungen, um ein geeignetes Zustandsüberwachungssystem
für die jeweilige Anwendung zu entwickeln. Eine offene Fragestellung im Bereich
der Zustandsüberwachung ergibt sich aufgrund der Unsicherheit der Zukunft, die
sich in den zukünftigen Betriebs- und Umgebungsbedingungen zeigt. Diese Unsicherheit
gilt es in allen Bausteinen zu berücksichtigen.\r\nDieser Beitrag konzentriert
sich auf den Baustein Merkmalsextraktion und -selektion, mit dem Ziel anhand geeigneter
Merkmale eine Prognose der nutzbaren Restlebensdauer mit hoher Genauigkeit realisieren
zu können. Daher werden geeignete Merkmale aus dem Zeitbereich und daraus abgeleitete
Zustandsindikatoren für die Restlebensdauerprognose von technischen Systemen vorgestellt.
Dabei sind Zustandsindikatoren Kenngrößen zur Beobachtung des Zustands der kritischen
Systemkomponenten. Anhand dreier Anwendungsbeispiele wird ihre Eignung evaluiert.
Dabei werden Daten aus Lebensdauerversuchen unter instationären Betriebs- und
Umgebungsbedingungen ausgewertet. Die auftretenden Unsicherheiten der Zukunft
werden somit berücksichtigt. Die Beispielsysteme beruhen auf Gummi-Metall-Elementen
und Wälzlagern. Aus den generierten Ergebnissen lässt sich schließen, dass die
Zustandsindikatoren aus der betrachteten Zeitreihen-Toolbox auch unter unbekannten
Betriebs- und Umgebungsbedingungen robust sind.\r\n"
- lang: eng
text: "Due to the advances in digitalization, condition monitoring systems have
found numerous applications in the industry due to benefits such as improved reliability
and lowered costs through condition-based or predictive maintenance. Condition
monitoring systems typically involve elements, such as data acquisition via suitable
sensors, data preprocessing, feature extraction and selection, diagnostics, prognostics
and (maintenance) decisions based on diagnosis or prognosis. For the application-specific
development of a suitable condition monitoring system, each of these elements
requires individual settings. Due to the uncertainty of the future, an open question
arises in the condition monitoring field, which is reflected in unknown future
operating and environmental conditions. This uncertainty needs consideration in
all elements of a condition monitoring system.\r\nThis article focuses on feature
extraction and selection, building on the hypothesis that the remaining useful
life of a technical system can be predicted with high accuracy utilizing suitable
features. In this article, health indicators derived from time-domain features
that permit the monitoring of the health of critical system components are presented
for predicting the remaining useful life of technical systems. Three distinct
application examples based on rubber-metal elements and rolling-element bearings
are evaluated to validate the suitability of the presented methods. Experimental
data from accelerated lifetime tests conducted under non-stationary operating
and environmental conditions are considered to take possible future uncertainties
into account. It can be concluded from the acquired results that health indicators
derived from the presented time series toolbox are robust to varying operating
and environmental conditions.\r\n"
author:
- first_name: Osarenren Kennedy
full_name: Aimiyekagbon, Osarenren Kennedy
id: '9557'
last_name: Aimiyekagbon
- first_name: Amelie
full_name: Bender, Amelie
id: '54290'
last_name: Bender
- first_name: Walter
full_name: Sextro, Walter
id: '21220'
last_name: Sextro
citation:
ama: 'Aimiyekagbon OK, Bender A, Sextro W. Extraktion und Selektion geeigneter Merkmale
für die Restlebensdauerprognose von technischen Systemen trotz aleatorischen Unsicherheiten
. In: VDI-Berichte 2391. VDI Verlag GmbH; 2021:197-210.'
apa: Aimiyekagbon, O. K., Bender, A., & Sextro, W. (2021). Extraktion und Selektion
geeigneter Merkmale für die Restlebensdauerprognose von technischen Systemen trotz
aleatorischen Unsicherheiten . VDI-Berichte 2391, 197–210.
bibtex: '@inproceedings{Aimiyekagbon_Bender_Sextro_2021, place={Düsseldorf}, title={Extraktion
und Selektion geeigneter Merkmale für die Restlebensdauerprognose von technischen
Systemen trotz aleatorischen Unsicherheiten }, booktitle={VDI-Berichte 2391},
publisher={VDI Verlag GmbH}, author={Aimiyekagbon, Osarenren Kennedy and Bender,
Amelie and Sextro, Walter}, year={2021}, pages={197–210} }'
chicago: 'Aimiyekagbon, Osarenren Kennedy, Amelie Bender, and Walter Sextro. “Extraktion
und Selektion geeigneter Merkmale für die Restlebensdauerprognose von technischen
Systemen trotz aleatorischen Unsicherheiten .” In VDI-Berichte 2391, 197–210.
Düsseldorf: VDI Verlag GmbH, 2021.'
ieee: O. K. Aimiyekagbon, A. Bender, and W. Sextro, “Extraktion und Selektion geeigneter
Merkmale für die Restlebensdauerprognose von technischen Systemen trotz aleatorischen
Unsicherheiten ,” in VDI-Berichte 2391, Würzburg, 2021, pp. 197–210.
mla: Aimiyekagbon, Osarenren Kennedy, et al. “Extraktion und Selektion geeigneter
Merkmale für die Restlebensdauerprognose von technischen Systemen trotz aleatorischen
Unsicherheiten .” VDI-Berichte 2391, VDI Verlag GmbH, 2021, pp. 197–210.
short: 'O.K. Aimiyekagbon, A. Bender, W. Sextro, in: VDI-Berichte 2391, VDI Verlag
GmbH, Düsseldorf, 2021, pp. 197–210.'
conference:
end_date: 2021-11-17
location: Würzburg
name: '3. VDI-Fachtagung '
start_date: 2021-11-16
date_created: 2021-11-22T07:42:44Z
date_updated: 2022-01-06T06:57:43Z
department:
- _id: '151'
keyword:
- run-to-failure
- rubber-metal element
- bearing prognostics
- non-stationary operating conditions
- varying operating conditions
- feature extraction
- feature selection
language:
- iso: ger
page: 197 - 210
place: Düsseldorf
publication: VDI-Berichte 2391
publication_identifier:
isbn:
- 978-3-18-092391-8
issn:
- '0083-5560 '
publication_status: published
publisher: VDI Verlag GmbH
status: public
title: 'Extraktion und Selektion geeigneter Merkmale für die Restlebensdauerprognose
von technischen Systemen trotz aleatorischen Unsicherheiten '
type: conference
user_id: '9557'
year: '2021'
...
---
_id: '32559'
abstract:
- lang: eng
text: This investigation concentrates on value similarity between parents and their
children during adulthood. The interplay between gender, age, relationship quality,
and frequency of contact on value similarity was analyzed. A total of 600 adult
German children (53.8% women) and their parents took part in a questionnaire study.
Value orientation was measured with a short version of Schwartz’s Portrait Values
Questionnaire, and relationship quality with the Network of Relationships Inventory
(Furman & Buhrmeister, 1992).Value similarity was higher in mother–daughter
dyads compared to mother–son dyads, but in the other dyads, no significant differences
were found. Regarding relationship quality, verbal intimacy was not related to
value similarity. Parental satisfaction was associated with value similarity in
the father–child dyads. Satisfaction, as perceived by adult children, was linked
to value similarity in mother–child and father–son dyads. Furthermore, the frequency
of contact related to value similarity between mothers and sons.
author:
- first_name: Christian
full_name: Hoellger, Christian
last_name: Hoellger
- first_name: Sabrina
full_name: Sommer, Sabrina
last_name: Sommer
- first_name: Isabelle
full_name: Albert, Isabelle
last_name: Albert
- first_name: Heike M.
full_name: Buhl, Heike M.
id: '27152'
last_name: Buhl
citation:
ama: Hoellger C, Sommer S, Albert I, Buhl HM. Intergenerational Value Similarity
in Adulthood. Journal of Family Issues. 2020;42(6):1234-1257. doi:10.1177/0192513x20943914
apa: Hoellger, C., Sommer, S., Albert, I., & Buhl, H. M. (2020). Intergenerational
Value Similarity in Adulthood. Journal of Family Issues, 42(6),
1234–1257. https://doi.org/10.1177/0192513x20943914
bibtex: '@article{Hoellger_Sommer_Albert_Buhl_2020, title={Intergenerational Value
Similarity in Adulthood}, volume={42}, DOI={10.1177/0192513x20943914},
number={6}, journal={Journal of Family Issues}, publisher={SAGE Publications},
author={Hoellger, Christian and Sommer, Sabrina and Albert, Isabelle and Buhl,
Heike M.}, year={2020}, pages={1234–1257} }'
chicago: 'Hoellger, Christian, Sabrina Sommer, Isabelle Albert, and Heike M. Buhl.
“Intergenerational Value Similarity in Adulthood.” Journal of Family Issues
42, no. 6 (2020): 1234–57. https://doi.org/10.1177/0192513x20943914.'
ieee: 'C. Hoellger, S. Sommer, I. Albert, and H. M. Buhl, “Intergenerational Value
Similarity in Adulthood,” Journal of Family Issues, vol. 42, no. 6, pp.
1234–1257, 2020, doi: 10.1177/0192513x20943914.'
mla: Hoellger, Christian, et al. “Intergenerational Value Similarity in Adulthood.”
Journal of Family Issues, vol. 42, no. 6, SAGE Publications, 2020, pp.
1234–57, doi:10.1177/0192513x20943914.
short: C. Hoellger, S. Sommer, I. Albert, H.M. Buhl, Journal of Family Issues 42
(2020) 1234–1257.
date_created: 2022-08-03T05:56:45Z
date_updated: 2022-08-29T06:34:26Z
department:
- _id: '427'
doi: 10.1177/0192513x20943914
intvolume: ' 42'
issue: '6'
keyword:
- Adult child–parent dyads
- value similarity
- relationship quality
- frequency of contact
- parent-child-relationship
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://journals.sagepub.com/doi/pdf/10.1177/0192513X20943914
oa: '1'
page: 1234-1257
publication: Journal of Family Issues
publication_identifier:
issn:
- 0192-513X
- 1552-5481
publication_status: published
publisher: SAGE Publications
status: public
title: Intergenerational Value Similarity in Adulthood
type: journal_article
user_id: '42165'
volume: 42
year: '2020'
...
---
_id: '9972'
abstract:
- lang: eng
text: The transportation of dry fine powders is an emerging technologic task, as
in biotechnology, pharmaceu-tical and coatings industry the particle sizes of
processed powders get smaller and smaller. Fine powdersare primarily defined by
the fact that adhesive and cohesive forces outweigh the weight forces, leadingto
mostly unwanted agglomeration (clumping) and adhesion to surfaces. Thereby it
gets more difficult touse conventional conveyor systems (e.g. pneumatic or vibratory
conveyors) for transport. A rather newmethod for transporting these fine powders
is based on ultrasonic vibrations, which are used to reducefriction between powder
and substrate. Within this contribution an experimental set-up consisting of apipe,
a solenoid actuator for axial vibration and an annular piezoelectric actuator
for the high frequencyradial vibration of the pipe is described. Since amplitudes
of the radial pipe vibration should be as large aspossible to get high effects
of friction reduction, the pipe is excited to vibrate in resonance. To determinethe
optimum excitation frequency and actuator position the vibration modes and resonance
frequenciesof the pipe are calculated and measured. Results are in good accordance.
author:
- first_name: Paul
full_name: Dunst, Paul
id: '22130'
last_name: Dunst
- first_name: Tobias
full_name: Hemsel, Tobias
id: '210'
last_name: Hemsel
- first_name: Walter
full_name: Sextro, Walter
id: '21220'
last_name: Sextro
citation:
ama: Dunst P, Hemsel T, Sextro W. Analysis of pipe vibration in an ultrasonic powder
transportationsystem. elsevier. 2017;Sensors and Actuators A 263:733-736.
apa: Dunst, P., Hemsel, T., & Sextro, W. (2017). Analysis of pipe vibration
in an ultrasonic powder transportationsystem. Elsevier, Sensors and
Actuators A 263, 733–736.
bibtex: '@article{Dunst_Hemsel_Sextro_2017, title={Analysis of pipe vibration in
an ultrasonic powder transportationsystem}, volume={Sensors and Actuators A 263},
journal={elsevier}, author={Dunst, Paul and Hemsel, Tobias and Sextro, Walter},
year={2017}, pages={733–736} }'
chicago: 'Dunst, Paul, Tobias Hemsel, and Walter Sextro. “Analysis of Pipe Vibration
in an Ultrasonic Powder Transportationsystem.” Elsevier Sensors and Actuators
A 263 (2017): 733–36.'
ieee: P. Dunst, T. Hemsel, and W. Sextro, “Analysis of pipe vibration in an ultrasonic
powder transportationsystem,” elsevier, vol. Sensors and Actuators A 263,
pp. 733–736, 2017.
mla: Dunst, Paul, et al. “Analysis of Pipe Vibration in an Ultrasonic Powder Transportationsystem.”
Elsevier, vol. Sensors and Actuators A 263, 2017, pp. 733–36.
short: P. Dunst, T. Hemsel, W. Sextro, Elsevier Sensors and Actuators A 263 (2017)
733–736.
date_created: 2019-05-27T09:31:13Z
date_updated: 2019-09-16T10:23:40Z
department:
- _id: '151'
keyword:
- Powder transport Piezoelectrics Ultrasonics Pipe vibration Finite element simulation
Fine powder
language:
- iso: eng
page: 733-736
publication: elsevier
quality_controlled: '1'
status: public
title: Analysis of pipe vibration in an ultrasonic powder transportationsystem
type: journal_article
user_id: '55222'
volume: Sensors and Actuators A 263
year: '2017'
...
---
_id: '9955'
abstract:
- lang: eng
text: Wire bonding has been an established packaging technology for decades. When
introducing copper as wire material for high power applications, adaptations to
the bonding process and to machines became necessary. Here, challenges occur due
to the stiffer wire material and changing oxide layers on the contact partners.
To achieve sufficient process stability, a clean bond area is required, which
can only be achieved with high shear stresses in the contact partners surfaces.
These necessitate high normal forces to plastically deform the wire and substrate.
To achieve such high stresses in the contact area, the bonding tool needs to be
able to transmit the needed tangential forces to the top side of the wire. The
wire itself performs a shear movement and transmits the force into the contact
area to clean the contaminant and oxide layers and to level the desired bond surfaces.
The main function of the tool is to transmit these forces. If the bond tool can
only transmit low forces in the direction of excitation, the parameter space for
a stable bond process is severely restricted. Here, a modeling approach to estimate
how well different tool shapes meet the demand of transmitting high tangential
forces is presented. The model depends on wire deformation and thus on the ultrasonic
softening effect.
author:
- first_name: Simon
full_name: Althoff, Simon
last_name: Althoff
- first_name: Tobias
full_name: Meyer, Tobias
last_name: Meyer
- first_name: Andreas
full_name: Unger, Andreas
last_name: Unger
- first_name: Walter
full_name: Sextro, Walter
id: '21220'
last_name: Sextro
- first_name: Florian
full_name: Eacock, Florian
last_name: Eacock
citation:
ama: 'Althoff S, Meyer T, Unger A, Sextro W, Eacock F. Shape-Dependent Transmittable
Tangential Force of Wire Bond Tools. In: IEEE 66th Electronic Components and
Technology Conference. ; 2016:2103-2110. doi:10.1109/ECTC.2016.234'
apa: Althoff, S., Meyer, T., Unger, A., Sextro, W., & Eacock, F. (2016). Shape-Dependent
Transmittable Tangential Force of Wire Bond Tools. In IEEE 66th Electronic
Components and Technology Conference (pp. 2103–2110). https://doi.org/10.1109/ECTC.2016.234
bibtex: '@inproceedings{Althoff_Meyer_Unger_Sextro_Eacock_2016, title={Shape-Dependent
Transmittable Tangential Force of Wire Bond Tools}, DOI={10.1109/ECTC.2016.234},
booktitle={IEEE 66th Electronic Components and Technology Conference}, author={Althoff,
Simon and Meyer, Tobias and Unger, Andreas and Sextro, Walter and Eacock, Florian},
year={2016}, pages={2103–2110} }'
chicago: Althoff, Simon, Tobias Meyer, Andreas Unger, Walter Sextro, and Florian
Eacock. “Shape-Dependent Transmittable Tangential Force of Wire Bond Tools.” In
IEEE 66th Electronic Components and Technology Conference, 2103–10, 2016.
https://doi.org/10.1109/ECTC.2016.234.
ieee: S. Althoff, T. Meyer, A. Unger, W. Sextro, and F. Eacock, “Shape-Dependent
Transmittable Tangential Force of Wire Bond Tools,” in IEEE 66th Electronic
Components and Technology Conference, 2016, pp. 2103–2110.
mla: Althoff, Simon, et al. “Shape-Dependent Transmittable Tangential Force of Wire
Bond Tools.” IEEE 66th Electronic Components and Technology Conference,
2016, pp. 2103–10, doi:10.1109/ECTC.2016.234.
short: 'S. Althoff, T. Meyer, A. Unger, W. Sextro, F. Eacock, in: IEEE 66th Electronic
Components and Technology Conference, 2016, pp. 2103–2110.'
date_created: 2019-05-27T08:47:52Z
date_updated: 2020-05-07T05:33:52Z
department:
- _id: '151'
doi: 10.1109/ECTC.2016.234
keyword:
- finite element simulation
- wire bonding
- tool geometry
language:
- iso: eng
page: 2103-2110
project:
- _id: '92'
grant_number: 02 PQ2210
name: Intelligente Herstellung zuverlässiger Kupferbondverbindungen
publication: IEEE 66th Electronic Components and Technology Conference
quality_controlled: '1'
status: public
title: Shape-Dependent Transmittable Tangential Force of Wire Bond Tools
type: conference
user_id: '210'
year: '2016'
...
---
_id: '9963'
abstract:
- lang: eng
text: Tire-wheel assembly is the only connection between road and vehicle. Contacting
directly with road within postcard size of contact area, it is mounted and guided
by the suspension system. Therefore kinematics and compliances of suspension system
greatly influence the frictional coupling of tire tread elements and road surface
asperities by affecting pressure and sliding velocity distribution in the contact
zone. This study emphasizes the development of a numerical methodology for frictional
rolling contact analysis with focus on interaction of suspension system dynamics
and tire-road contact using ADAMS. For this purpose a comprehensive flexible multibody
system of the multi-link rear suspension is established, where both flexible and
rigid bodies are modeled to allow large displacements with included elastic effects.
To meet accuracy requirements for the high frequency applications, such as road
excitations, the amplitude- and frequency-dependency of rubber-metal bushings
is included. Furthermore the proposed flexible viscoelastic suspension model is
enhanced by a Flexible Ring Tire Model (FTire), which describes a 3D tire dynamic
response and covers any road excitations by tread submodel connected to road surface
model. Concerning the verification and validation procedure numerous experiments
are carried out to confirm the validity and the accuracy of both the developed
submodels and the entire model. The devised approach makes it possible to investigate
the influence of suspension system design on dynamical rolling contact and to
evaluate tire tread wear. Therefore it can be a useful tool to predict frictional
power distribution within the contact area under more realistic conditions.
author:
- first_name: Sergej
full_name: Kohl, Sergej
last_name: Kohl
- first_name: Walter
full_name: Sextro, Walter
id: '21220'
last_name: Sextro
- first_name: Sebastian
full_name: Schulze, Sebastian
last_name: Schulze
citation:
ama: 'Kohl S, Sextro W, Schulze S. Aspects of Flexible Viscoelastic Suspension Modeling
for Frictional Rolling Contact Analysis using ADAMS. In: The 2nd International
Conference on Automotive Innovation and Green Energy Vehicle (AiGEV 2016), Cyberjaya,
Malaysia, 2016. Cyberjaya, Malaysia, 2016; 2016:1-12.'
apa: Kohl, S., Sextro, W., & Schulze, S. (2016). Aspects of Flexible Viscoelastic
Suspension Modeling for Frictional Rolling Contact Analysis using ADAMS. In The
2nd International Conference on Automotive Innovation and Green Energy Vehicle
(AiGEV 2016), Cyberjaya, Malaysia, 2016. (pp. 1–12). Cyberjaya, Malaysia,
2016.
bibtex: '@inproceedings{Kohl_Sextro_Schulze_2016, place={Cyberjaya, Malaysia, 2016},
title={Aspects of Flexible Viscoelastic Suspension Modeling for Frictional Rolling
Contact Analysis using ADAMS}, booktitle={The 2nd International Conference on
Automotive Innovation and Green Energy Vehicle (AiGEV 2016), Cyberjaya, Malaysia,
2016.}, author={Kohl, Sergej and Sextro, Walter and Schulze, Sebastian}, year={2016},
pages={1–12} }'
chicago: Kohl, Sergej, Walter Sextro, and Sebastian Schulze. “Aspects of Flexible
Viscoelastic Suspension Modeling for Frictional Rolling Contact Analysis Using
ADAMS.” In The 2nd International Conference on Automotive Innovation and Green
Energy Vehicle (AiGEV 2016), Cyberjaya, Malaysia, 2016., 1–12. Cyberjaya,
Malaysia, 2016, 2016.
ieee: S. Kohl, W. Sextro, and S. Schulze, “Aspects of Flexible Viscoelastic Suspension
Modeling for Frictional Rolling Contact Analysis using ADAMS,” in The 2nd International
Conference on Automotive Innovation and Green Energy Vehicle (AiGEV 2016), Cyberjaya,
Malaysia, 2016., 2016, pp. 1–12.
mla: Kohl, Sergej, et al. “Aspects of Flexible Viscoelastic Suspension Modeling
for Frictional Rolling Contact Analysis Using ADAMS.” The 2nd International
Conference on Automotive Innovation and Green Energy Vehicle (AiGEV 2016), Cyberjaya,
Malaysia, 2016., 2016, pp. 1–12.
short: 'S. Kohl, W. Sextro, S. Schulze, in: The 2nd International Conference on
Automotive Innovation and Green Energy Vehicle (AiGEV 2016), Cyberjaya, Malaysia,
2016., Cyberjaya, Malaysia, 2016, 2016, pp. 1–12.'
date_created: 2019-05-27T09:13:14Z
date_updated: 2019-05-27T09:13:54Z
department:
- _id: '151'
keyword:
- Kinematics and compliances
- flexible viscoelastic suspension model
- frictional rolling contact analysis
- frictional power distribution.
language:
- iso: eng
page: 1-12
place: Cyberjaya, Malaysia, 2016
publication: The 2nd International Conference on Automotive Innovation and Green Energy
Vehicle (AiGEV 2016), Cyberjaya, Malaysia, 2016.
status: public
title: Aspects of Flexible Viscoelastic Suspension Modeling for Frictional Rolling
Contact Analysis using ADAMS
type: conference
user_id: '55222'
year: '2016'
...
---
_id: '9952'
abstract:
- lang: eng
text: The contact between viscoelastic materials e.g. elastomers and a rough surface
leads to a special friction characteristic, which differs greatly in its properties
comparing to other materials like metals. In practice, this friction combination
occurs for example in the tire-road contact, or in the use of rubber gaskets.
Due to the frictional forces a system is significantly influenced in its vibrational
properties. The friction force is composed of two main components adhesion and
hysteresis. The adhesion results from molecular bounds between the contact partners,
while the deformation of the viscoelastic material by the roughness of the counter
body leads to power loss. This internal friction results in an additional frictional
force, which is described by the hysteresis. To simulate the frictional behaviour
of elastomers on rough surfaces and thus to determine the energy dissipation in
contact, it is necessary to develop a mechanical model which considers the roughness
of the contact partners, as well as dynamic effects and the dependence on normal
pressure and sliding speed. The viscoelastic material behaviour must also be considered.
The contact between two rough surfaces is modelled as a rough rigid layer contacting
a rough elas- tic layer. The elastic layer is modelled by point masses connected
by Maxwell-elements. This allows the viscoelastic properties of the elastomer
to be considered. The behaviour of whole system can be described by equations
of motion with integrated constraints. The degrees of freedom of the model depends
on the varying contact conditions. A point mass not in contact has two degrees
of freedom. A point mass in contact moving along the roughness path can be described
by only one degree of freedom. For each Maxwell-Element also an inner coordinate
and thus a further degree of freedom is needed. Because of varying contact conditions
dur- ing the simulation, the simulation interrupts in case the contact conditions
change. Then the equations of motions are adapted with respect to the contact
constraints. As a result of the simulation one obtain the energy dissipation and
thus the friction char- acteristic during the friction process. It is possible
to use these results in three dimensional point-contact elements in order to model
contact surfaces on lager length scales.
author:
- first_name: Frank
full_name: Schulte, Frank
last_name: Schulte
- first_name: Jan
full_name: Neuhaus, Jan
last_name: Neuhaus
- first_name: Walter
full_name: Sextro, Walter
id: '21220'
last_name: Sextro
citation:
ama: 'Schulte F, Neuhaus J, Sextro W. A Mechanical Model for the Dynamical Contact
of Elastic Rough Bodies with Viscoelastic Properties. In: Proceedings of ICoEV
2015 International Conference on Engineering Vibration. ; 2015:1109-1117.'
apa: Schulte, F., Neuhaus, J., & Sextro, W. (2015). A Mechanical Model for the
Dynamical Contact of Elastic Rough Bodies with Viscoelastic Properties. In Proceedings
of ICoEV 2015 International Conference on Engineering Vibration (pp. 1109–1117).
bibtex: '@inproceedings{Schulte_Neuhaus_Sextro_2015, title={A Mechanical Model for
the Dynamical Contact of Elastic Rough Bodies with Viscoelastic Properties}, booktitle={Proceedings
of ICoEV 2015 International Conference on Engineering Vibration}, author={Schulte,
Frank and Neuhaus, Jan and Sextro, Walter}, year={2015}, pages={1109–1117} }'
chicago: Schulte, Frank, Jan Neuhaus, and Walter Sextro. “A Mechanical Model for
the Dynamical Contact of Elastic Rough Bodies with Viscoelastic Properties.” In
Proceedings of ICoEV 2015 International Conference on Engineering Vibration,
1109–17, 2015.
ieee: F. Schulte, J. Neuhaus, and W. Sextro, “A Mechanical Model for the Dynamical
Contact of Elastic Rough Bodies with Viscoelastic Properties,” in Proceedings
of ICoEV 2015 International Conference on Engineering Vibration, 2015, pp.
1109–1117.
mla: Schulte, Frank, et al. “A Mechanical Model for the Dynamical Contact of Elastic
Rough Bodies with Viscoelastic Properties.” Proceedings of ICoEV 2015 International
Conference on Engineering Vibration, 2015, pp. 1109–17.
short: 'F. Schulte, J. Neuhaus, W. Sextro, in: Proceedings of ICoEV 2015 International
Conference on Engineering Vibration, 2015, pp. 1109–1117.'
date_created: 2019-05-27T08:37:22Z
date_updated: 2019-09-16T10:47:53Z
department:
- _id: '151'
keyword:
- Contact Mechanics
- Viscoelastic Material
- Adhesive Friction
- Hysteresis Friction
- Energy Dissipation
- Vibration
language:
- iso: eng
page: 1109-1117
publication: Proceedings of ICoEV 2015 International Conference on Engineering Vibration
quality_controlled: '1'
status: public
title: A Mechanical Model for the Dynamical Contact of Elastic Rough Bodies with Viscoelastic
Properties
type: conference
user_id: '55222'
year: '2015'
...
---
_id: '13893'
abstract:
- lang: eng
text: In this contribution, we present an efficient approach for the transient and
time-causal modeling of guided waves in viscoelastic cylindrical waveguides in
the context of ultrasonic material characterization. We use the scaled boundary
finite element method (SBFEM) for efficient computation of the phase velocity
dispersion. Regarding the viscoelastic behavior of the materials under consideration,
we propose a decomposition approach that considers the real-valued frequency dependence
of the (visco-)elastic moduli and, separately, of their attenuation. The modal
expansion approach is utilized to take the transmitting and receiving transducers
into account and to propagate the excited waveguide modes through a waveguide
of finite length. The effectiveness of the proposed simulation model is shown
by comparison with a standard transient FEM simulation as well as simulation results
based on the exact solution of the complex-valued viscoelastic guided wave problem.
Two material models are discussed, namely the fractional Zener model and the anti-Zener
model; we re-interpret the latter in terms of the Rayleigh damping model. Measurements
are taken on a polypropylene sample and the proposed transient simulation model
is used for inverse material characterization. The extracted material properties
may then be used in computer-aided design of ultrasonic systems.
author:
- first_name: Fabian
full_name: Bause, Fabian
last_name: Bause
- first_name: Hauke
full_name: Gravenkamp, Hauke
last_name: Gravenkamp
- first_name: Jens
full_name: Rautenberg, Jens
last_name: Rautenberg
- first_name: Bernd
full_name: Henning, Bernd
last_name: Henning
citation:
ama: Bause F, Gravenkamp H, Rautenberg J, Henning B. Transient modeling of ultrasonic
guided waves in circular viscoelastic waveguides for inverse material characterization.
Measurement Science and Technology. 2015;26(095602 (17pp)). doi:10.1088/0957-0233/26/9/095602
apa: Bause, F., Gravenkamp, H., Rautenberg, J., & Henning, B. (2015). Transient
modeling of ultrasonic guided waves in circular viscoelastic waveguides for inverse
material characterization. Measurement Science and Technology, 26(095602
(17pp)). https://doi.org/10.1088/0957-0233/26/9/095602
bibtex: '@article{Bause_Gravenkamp_Rautenberg_Henning_2015, title={Transient modeling
of ultrasonic guided waves in circular viscoelastic waveguides for inverse material
characterization}, volume={26}, DOI={10.1088/0957-0233/26/9/095602},
number={095602 (17pp)}, journal={Measurement Science and Technology}, author={Bause,
Fabian and Gravenkamp, Hauke and Rautenberg, Jens and Henning, Bernd}, year={2015}
}'
chicago: Bause, Fabian, Hauke Gravenkamp, Jens Rautenberg, and Bernd Henning. “Transient
Modeling of Ultrasonic Guided Waves in Circular Viscoelastic Waveguides for Inverse
Material Characterization.” Measurement Science and Technology 26, no.
095602 (17pp) (2015). https://doi.org/10.1088/0957-0233/26/9/095602.
ieee: F. Bause, H. Gravenkamp, J. Rautenberg, and B. Henning, “Transient modeling
of ultrasonic guided waves in circular viscoelastic waveguides for inverse material
characterization,” Measurement Science and Technology, vol. 26, no. 095602
(17pp), 2015.
mla: Bause, Fabian, et al. “Transient Modeling of Ultrasonic Guided Waves in Circular
Viscoelastic Waveguides for Inverse Material Characterization.” Measurement
Science and Technology, vol. 26, no. 095602 (17pp), 2015, doi:10.1088/0957-0233/26/9/095602.
short: F. Bause, H. Gravenkamp, J. Rautenberg, B. Henning, Measurement Science and
Technology 26 (2015).
date_created: 2019-10-16T14:24:43Z
date_updated: 2022-01-06T06:51:46Z
department:
- _id: '49'
doi: 10.1088/0957-0233/26/9/095602
intvolume: ' 26'
issue: 095602 (17pp)
keyword:
- viscoelasticity
- ultrasonics
- guided waves
- inverse problem
- scaled boundary finite element method
language:
- iso: eng
publication: Measurement Science and Technology
publication_identifier:
issn:
- 0957-0233
status: public
title: Transient modeling of ultrasonic guided waves in circular viscoelastic waveguides
for inverse material characterization
type: journal_article
user_id: '15911'
volume: 26
year: '2015'
...
---
_id: '9868'
abstract:
- lang: eng
text: In order to increase mechanical strength, heat dissipation and ampacity and
to decrease failure through fatigue fracture, wedge copper wire bonding is being
introduced as a standard interconnection method for mass production. To achieve
the same process stability when using copper wire instead of aluminum wire a profound
understanding of the bonding process is needed. Due to the higher hardness of
copper compared to aluminum wire it is more difficult to approach the surfaces
of wire and substrate to a level where van der Waals forces are able to arise
between atoms. Also, enough friction energy referred to the total contact area
has to be generated to activate the surfaces. Therefore, a friction model is used
to simulate the joining process. This model calculates the resulting energy of
partial areas in the contact surface and provides information about the adhesion
process of each area. The focus here is on the arising of micro joints in the
contact area depending on the location in the contact and time. To validate the
model, different touchdown forces are used to vary the initial contact areas of
wire and substrate. Additionally, a piezoelectric tri-axial force sensor is built
up to identify the known phases of pre-deforming, cleaning, adhering and diffusing
for the real bonding process to map with the model. Test substrates as DBC and
copper plate are used to show the different formations of a wedge bond connection
due to hardness and reaction propensity. The experiments were done by using 500
$\mu$m copper wire and a standard V-groove tool.
author:
- first_name: Simon
full_name: Althoff, Simon
last_name: Althoff
- first_name: Jan
full_name: Neuhaus, Jan
last_name: Neuhaus
- first_name: Tobias
full_name: Hemsel, Tobias
id: '210'
last_name: Hemsel
- first_name: Walter
full_name: Sextro, Walter
id: '21220'
last_name: Sextro
citation:
ama: 'Althoff S, Neuhaus J, Hemsel T, Sextro W. Improving the bond quality of copper
wire bonds using a friction model approach. In: Electronic Components and Technology
Conference (ECTC), 2014 IEEE 64th. ; 2014:1549-1555. doi:10.1109/ECTC.2014.6897500'
apa: Althoff, S., Neuhaus, J., Hemsel, T., & Sextro, W. (2014). Improving the
bond quality of copper wire bonds using a friction model approach. In Electronic
Components and Technology Conference (ECTC), 2014 IEEE 64th (pp. 1549–1555).
https://doi.org/10.1109/ECTC.2014.6897500
bibtex: '@inproceedings{Althoff_Neuhaus_Hemsel_Sextro_2014, title={Improving the
bond quality of copper wire bonds using a friction model approach}, DOI={10.1109/ECTC.2014.6897500},
booktitle={Electronic Components and Technology Conference (ECTC), 2014 IEEE 64th},
author={Althoff, Simon and Neuhaus, Jan and Hemsel, Tobias and Sextro, Walter},
year={2014}, pages={1549–1555} }'
chicago: Althoff, Simon, Jan Neuhaus, Tobias Hemsel, and Walter Sextro. “Improving
the Bond Quality of Copper Wire Bonds Using a Friction Model Approach.” In Electronic
Components and Technology Conference (ECTC), 2014 IEEE 64th, 1549–55, 2014.
https://doi.org/10.1109/ECTC.2014.6897500.
ieee: S. Althoff, J. Neuhaus, T. Hemsel, and W. Sextro, “Improving the bond quality
of copper wire bonds using a friction model approach,” in Electronic Components
and Technology Conference (ECTC), 2014 IEEE 64th, 2014, pp. 1549–1555.
mla: Althoff, Simon, et al. “Improving the Bond Quality of Copper Wire Bonds Using
a Friction Model Approach.” Electronic Components and Technology Conference
(ECTC), 2014 IEEE 64th, 2014, pp. 1549–55, doi:10.1109/ECTC.2014.6897500.
short: 'S. Althoff, J. Neuhaus, T. Hemsel, W. Sextro, in: Electronic Components
and Technology Conference (ECTC), 2014 IEEE 64th, 2014, pp. 1549–1555.'
date_created: 2019-05-20T12:11:44Z
date_updated: 2019-09-16T10:57:58Z
department:
- _id: '151'
doi: 10.1109/ECTC.2014.6897500
keyword:
- adhesion
- circuit reliability
- deformation
- diffusion
- fatigue cracks
- friction
- interconnections
- lead bonding
- van der Waals forces
- Cu
- adhering process
- adhesion process
- ampacity improvement
- bond quality improvement
- cleaning process
- diffusing process
- fatigue fracture failure
- friction energy
- friction model
- heat dissipation
- mechanical strength
- piezoelectric triaxial force sensor
- predeforming process
- size 500 mum
- total contact area
- van der Waals forces
- wedge copper wire bonding
- Bonding
- Copper
- Finite element analysis
- Force
- Friction
- Substrates
- Wires
language:
- iso: eng
page: 1549-1555
publication: Electronic Components and Technology Conference (ECTC), 2014 IEEE 64th
quality_controlled: '1'
status: public
title: Improving the bond quality of copper wire bonds using a friction model approach
type: conference
user_id: '55222'
year: '2014'
...
---
_id: '9887'
abstract:
- lang: eng
text: A model to calculate the locally resolved tangential contact forces of the
wheel rail contact with respect to contact kinematics, material and surface properties
as well as temperature is introduced. The elasticity of wheel and rail is modeled
as an elastic layer consisting of point contact elements connected by springs
to each other and to the wheel. Each element has two degrees of freedom in tangential
directions. The resulting total stiffness matrix is reduced to calculate only
the position of the elements in contact. Friction forces as well as contact stiffnesses
are incorporated by a nonlinear force-displacement characteristic, which originates
from a detailed contact model. The contact elements are transported through the
contact zone in discrete time steps. After each time step an equilibrium is calculated.
For all elements, their temperature and its influence on local friction are regarded
by calculating friction power and temperature each time step.
author:
- first_name: Jan
full_name: Neuhaus, Jan
last_name: Neuhaus
- first_name: Walter
full_name: Sextro, Walter
id: '21220'
last_name: Sextro
citation:
ama: 'Neuhaus J, Sextro W. Thermo-Mechanical Model for Wheel Rail Contact using
Coupled Point Contact Elements. In: Liu GR, Guan ZW, eds. Proceedings of the
5th International Conference on Computational Methods. ScienTech Publisher;
2014.'
apa: Neuhaus, J., & Sextro, W. (2014). Thermo-Mechanical Model for Wheel Rail
Contact using Coupled Point Contact Elements. In G. R. Liu & Z. W. Guan (Eds.),
Proceedings of the 5th International Conference on Computational Methods.
ScienTech Publisher.
bibtex: '@inproceedings{Neuhaus_Sextro_2014, title={Thermo-Mechanical Model for
Wheel Rail Contact using Coupled Point Contact Elements}, booktitle={Proceedings
of the 5th International Conference on Computational Methods}, publisher={ScienTech
Publisher}, author={Neuhaus, Jan and Sextro, Walter}, editor={Liu, G.R. and Guan,
Z.W.Editors}, year={2014} }'
chicago: Neuhaus, Jan, and Walter Sextro. “Thermo-Mechanical Model for Wheel Rail
Contact Using Coupled Point Contact Elements.” In Proceedings of the 5th International
Conference on Computational Methods, edited by G.R. Liu and Z.W. Guan. ScienTech
Publisher, 2014.
ieee: J. Neuhaus and W. Sextro, “Thermo-Mechanical Model for Wheel Rail Contact
using Coupled Point Contact Elements,” in Proceedings of the 5th International
Conference on Computational Methods, 2014.
mla: Neuhaus, Jan, and Walter Sextro. “Thermo-Mechanical Model for Wheel Rail Contact
Using Coupled Point Contact Elements.” Proceedings of the 5th International
Conference on Computational Methods, edited by G.R. Liu and Z.W. Guan, ScienTech
Publisher, 2014.
short: 'J. Neuhaus, W. Sextro, in: G.R. Liu, Z.W. Guan (Eds.), Proceedings of the
5th International Conference on Computational Methods, ScienTech Publisher, 2014.'
date_created: 2019-05-20T13:23:02Z
date_updated: 2019-09-16T10:59:46Z
department:
- _id: '151'
editor:
- first_name: G.R.
full_name: Liu, G.R.
last_name: Liu
- first_name: Z.W.
full_name: Guan, Z.W.
last_name: Guan
keyword:
- Rolling Contact
- Discrete Elements
- Contact Stiffness
- Temperature
language:
- iso: eng
publication: Proceedings of the 5th International Conference on Computational Methods
publisher: ScienTech Publisher
quality_controlled: '1'
status: public
title: Thermo-Mechanical Model for Wheel Rail Contact using Coupled Point Contact
Elements
type: conference
user_id: '55222'
year: '2014'
...
---
_id: '9895'
abstract:
- lang: eng
text: Power semiconductor modules are used to control and switch high electrical
currents and voltages. Within the power module package wire bonding is used as
an interconnection technology. In recent years, aluminum wire has been used preferably,
but an ever-growing market of powerful and efficient power modules requires a
material with better mechanical and electrical properties. For this reason, a
technology change from aluminum to copper is indispensable. However, the copper
wire bonding process reacts more sensitive to parameter changes. This makes manufacturing
reliable copper bond connections a challenging task. The aim of the BMBF funded
project Itsowl-InCuB is the development of self-optimizing techniques to enable
the reliable production of copper bond connections under varying conditions. A
model of the process is essential to achieve this aim. This model needs to include
the dynamic elasto-plastic deformation, the ultrasonic softening effect and the
proceeding adhesion between wire and substrate. This paper focusses on the pre-deformation
process. In the touchdown phase, the wire is pressed into the V-groove of the
tool and a small initial contact area between wire and substrate arise. The local
characteristics of the material change abruptly because of the cold forming. Consequently,
the pre-deformation has a strong effect on the joining process. In [1], a pre-cleaning
effect during the touchdown process of aluminum wires by cracking of oxide layers
was presented. These interactions of the process parameters are still largely
unknown for copper. In a first step, this paper validates the importance of modeling
the pre-deformation by showing its impact on the wire deformation characteristic
experimentally. Creating cross-section views of pre-deformed copper wires has
shown a low deformation degree compared to aluminum. By using a digital microscope
and a scanning confocal microscope an analysis about the contact areas and penetration
depths after touchdown has been made. Additionally, it has to be taken into account
that the dynamical touchdown force depends on the touchdown speed and the touchdown
force set in the bonding machine. In order to measure the overshoot in the force
signals, a strain gauge sensor has been used. Subsequently, the affecting factors
have been interpreted independently Furthermore, the material properties of copper
wire have been investigated with tensile tests and hardness measurements. In a
second step, the paper presents finite element models of the touchdown process
for source and destination bonds. These models take the measured overshoot in
the touchdown forces into account. A multi-linear, isotropic material model has
been selected to map the material properties of the copper. A validation of the
model with the experimental determined contact areas, normal pressures and penetration
depths reveals the high model quality. Thus, the simulation is able to calculate
and visualize the three dimensional pre-deformation with an integrated material
parameter of the wire if the touchdown parameters of the bonding machine are known.
Based on the calculated deformation degrees of wire and substrate, it is probably
possible to investigate the effect of the pre-deformation on the pre-cleaning
phase in the copper wire bonding.
author:
- first_name: Andreas
full_name: Unger, Andreas
last_name: Unger
- first_name: Walter
full_name: Sextro, Walter
id: '21220'
last_name: Sextro
- first_name: Simon
full_name: Althoff, Simon
last_name: Althoff
- first_name: Paul
full_name: Eichwald, Paul
last_name: Eichwald
- first_name: Tobias
full_name: Meyer, Tobias
last_name: Meyer
- first_name: Florian
full_name: Eacock, Florian
last_name: Eacock
- first_name: Michael
full_name: Brökelmann, Michael
last_name: Brökelmann
citation:
ama: 'Unger A, Sextro W, Althoff S, et al. Experimental and Numerical Simulation
Study of Pre-Deformed Heavy Copper Wire Wedge Bonds. In: Proceedings of the
47th International Symposium on Microelectronics (IMAPS). San Diego, CA, US;
2014:289-294.'
apa: Unger, A., Sextro, W., Althoff, S., Eichwald, P., Meyer, T., Eacock, F., &
Brökelmann, M. (2014). Experimental and Numerical Simulation Study of Pre-Deformed
Heavy Copper Wire Wedge Bonds. In Proceedings of the 47th International Symposium
on Microelectronics (IMAPS) (pp. 289–294). San Diego, CA, US.
bibtex: '@inproceedings{Unger_Sextro_Althoff_Eichwald_Meyer_Eacock_Brökelmann_2014,
place={San Diego, CA, US}, title={Experimental and Numerical Simulation Study
of Pre-Deformed Heavy Copper Wire Wedge Bonds}, booktitle={Proceedings of the
47th International Symposium on Microelectronics (IMAPS)}, author={Unger, Andreas
and Sextro, Walter and Althoff, Simon and Eichwald, Paul and Meyer, Tobias and
Eacock, Florian and Brökelmann, Michael}, year={2014}, pages={289–294} }'
chicago: Unger, Andreas, Walter Sextro, Simon Althoff, Paul Eichwald, Tobias Meyer,
Florian Eacock, and Michael Brökelmann. “Experimental and Numerical Simulation
Study of Pre-Deformed Heavy Copper Wire Wedge Bonds.” In Proceedings of the
47th International Symposium on Microelectronics (IMAPS), 289–94. San Diego,
CA, US, 2014.
ieee: A. Unger et al., “Experimental and Numerical Simulation Study of Pre-Deformed
Heavy Copper Wire Wedge Bonds,” in Proceedings of the 47th International Symposium
on Microelectronics (IMAPS), 2014, pp. 289–294.
mla: Unger, Andreas, et al. “Experimental and Numerical Simulation Study of Pre-Deformed
Heavy Copper Wire Wedge Bonds.” Proceedings of the 47th International Symposium
on Microelectronics (IMAPS), 2014, pp. 289–94.
short: 'A. Unger, W. Sextro, S. Althoff, P. Eichwald, T. Meyer, F. Eacock, M. Brökelmann,
in: Proceedings of the 47th International Symposium on Microelectronics (IMAPS),
San Diego, CA, US, 2014, pp. 289–294.'
date_created: 2019-05-20T13:35:09Z
date_updated: 2020-05-07T05:33:47Z
department:
- _id: '151'
keyword:
- pre-deformation
- copper wire bonding
- finite element model
language:
- iso: eng
page: 289-294
place: San Diego, CA, US
project:
- _id: '92'
grant_number: 02 PQ2210
name: Intelligente Herstellung zuverlässiger Kupferbondverbindungen
publication: Proceedings of the 47th International Symposium on Microelectronics (IMAPS)
status: public
title: Experimental and Numerical Simulation Study of Pre-Deformed Heavy Copper Wire
Wedge Bonds
type: conference
user_id: '210'
year: '2014'
...
---
_id: '34442'
abstract:
- lang: eng
text: Radial shaft seals are used in a variety of applications, where rotating shafts
in steady housings have to be sealed. Typical examples are crankshafts, camshafts,
differential gear or hydraulic pumps. In the operating state the elastomeric seal
ring and the shaft are separated by a lubrication film of just a few micrometers.
Due to shear strain and fluid friction the contact area is subject to a higher
temperature than the rest of the seal ring. The stiffness of the elastomeric material
is intensely influenced by this temperature and thus contact pressure, friction
and wear also strongly depend on the contact temperature. In order to simulate
the contact behavior of elastomer seal rings it is essential to use a comprehensive
approach which takes into consideration the interaction of temperature, friction
and wear. Based on this idea a macroscopic simulation model has been developed
at the MEGT. It combines a finite element approach for the simulation of contact
pressure at different wear states, a semi-analytical approach for the calculation
of contact temperature and an empirical approach for the calculation of friction.
In this paper the model setup is presented, as well as simulation and experimental
results.
author:
- first_name: D.
full_name: Frölich, D.
last_name: Frölich
- first_name: Balázs
full_name: Magyar, Balázs
id: '97759'
last_name: Magyar
- first_name: B.
full_name: Sauer, B.
last_name: Sauer
citation:
ama: Frölich D, Magyar B, Sauer B. A comprehensive model of wear, friction and contact
temperature in radial shaft seals. Wear. 2014;311(1):71-80. doi:https://doi.org/10.1016/j.wear.2013.12.030
apa: Frölich, D., Magyar, B., & Sauer, B. (2014). A comprehensive model of wear,
friction and contact temperature in radial shaft seals. Wear, 311(1),
71–80. https://doi.org/10.1016/j.wear.2013.12.030
bibtex: '@article{Frölich_Magyar_Sauer_2014, title={A comprehensive model of wear,
friction and contact temperature in radial shaft seals}, volume={311}, DOI={https://doi.org/10.1016/j.wear.2013.12.030},
number={1}, journal={Wear}, author={Frölich, D. and Magyar, Balázs and Sauer,
B.}, year={2014}, pages={71–80} }'
chicago: 'Frölich, D., Balázs Magyar, and B. Sauer. “A Comprehensive Model of Wear,
Friction and Contact Temperature in Radial Shaft Seals.” Wear 311, no.
1 (2014): 71–80. https://doi.org/10.1016/j.wear.2013.12.030.'
ieee: 'D. Frölich, B. Magyar, and B. Sauer, “A comprehensive model of wear, friction
and contact temperature in radial shaft seals,” Wear, vol. 311, no. 1,
pp. 71–80, 2014, doi: https://doi.org/10.1016/j.wear.2013.12.030.'
mla: Frölich, D., et al. “A Comprehensive Model of Wear, Friction and Contact Temperature
in Radial Shaft Seals.” Wear, vol. 311, no. 1, 2014, pp. 71–80, doi:https://doi.org/10.1016/j.wear.2013.12.030.
short: D. Frölich, B. Magyar, B. Sauer, Wear 311 (2014) 71–80.
date_created: 2022-12-15T10:19:37Z
date_updated: 2022-12-15T10:20:39Z
department:
- _id: '146'
doi: https://doi.org/10.1016/j.wear.2013.12.030
extern: '1'
intvolume: ' 311'
issue: '1'
keyword:
- Radial shaft seal ring
- Contact temperature
- Wear
- Friction torque
- Finite element simulation
language:
- iso: eng
page: 71-80
publication: Wear
publication_identifier:
issn:
- 0043-1648
status: public
title: A comprehensive model of wear, friction and contact temperature in radial shaft
seals
type: journal_article
user_id: '38077'
volume: 311
year: '2014'
...
---
_id: '36918'
abstract:
- lang: eng
text: This paper presents an advanced eight levels spanning SystemC based virtual
platform methodology and framework - referred to as HeroeS 3 - providing smooth
application to platform mapping and continuous co-refinement of a virtual prototype
with its physical environment model. For heterogeneity support, various SystemC
extensions are combined covering continuous/discrete models of computation and
different communication abstractions, such as analog mixed-signal models, abstract
RTOS/HAL/middleware models, TLM bus models, and QEMU wrappers. We enable dependability
assessment by Fault Effect Modeling (FEM) at the virtual prototype in order to
avoid risking physical injury or damage. Also, simulation results are deterministic
and can be evaluated interactively or offline. We apply FEM to both the physical
environment model and the different abstractions of the virtual prototype. Currently,
we focus on sensor failures and application control flow errors.
author:
- first_name: Markus
full_name: Becker, Markus
last_name: Becker
- first_name: Christoph
full_name: Kuznik, Christoph
last_name: Kuznik
- first_name: Wolfgang
full_name: Müller, Wolfgang
id: '16243'
last_name: Müller
citation:
ama: 'Becker M, Kuznik C, Müller W. Fault Effect Modeling in a Heterogeneous SystemC
Based Virtual Platform Framework for Cyber Physical Systems. In: IEEE; 2014. doi:10.1109/ICCPS.2014.6843726'
apa: Becker, M., Kuznik, C., & Müller, W. (2014). Fault Effect Modeling in
a Heterogeneous SystemC Based Virtual Platform Framework for Cyber Physical Systems.
ACM/IEEE International Conference on Cyber-Physical Systems (ICCPS), Berlin. https://doi.org/10.1109/ICCPS.2014.6843726
bibtex: '@inproceedings{Becker_Kuznik_Müller_2014, place={Berlin}, title={Fault
Effect Modeling in a Heterogeneous SystemC Based Virtual Platform Framework for
Cyber Physical Systems}, DOI={10.1109/ICCPS.2014.6843726},
publisher={IEEE}, author={Becker, Markus and Kuznik, Christoph and Müller, Wolfgang},
year={2014} }'
chicago: 'Becker, Markus, Christoph Kuznik, and Wolfgang Müller. “Fault Effect Modeling
in a Heterogeneous SystemC Based Virtual Platform Framework for Cyber Physical
Systems.” Berlin: IEEE, 2014. https://doi.org/10.1109/ICCPS.2014.6843726.'
ieee: 'M. Becker, C. Kuznik, and W. Müller, “Fault Effect Modeling in a Heterogeneous
SystemC Based Virtual Platform Framework for Cyber Physical Systems,” presented
at the ACM/IEEE International Conference on Cyber-Physical Systems (ICCPS), Berlin,
2014, doi: 10.1109/ICCPS.2014.6843726.'
mla: Becker, Markus, et al. Fault Effect Modeling in a Heterogeneous SystemC
Based Virtual Platform Framework for Cyber Physical Systems. IEEE, 2014, doi:10.1109/ICCPS.2014.6843726.
short: 'M. Becker, C. Kuznik, W. Müller, in: IEEE, Berlin, 2014.'
conference:
location: Berlin
name: ACM/IEEE International Conference on Cyber-Physical Systems (ICCPS)
date_created: 2023-01-16T11:57:08Z
date_updated: 2023-01-16T11:57:22Z
department:
- _id: '58'
doi: 10.1109/ICCPS.2014.6843726
keyword:
- Computational modeling
- Finite element analysis
- Prototypes
- Abstracts
- Software
- Fault tolerance
- Fault tolerant systems
language:
- iso: eng
place: Berlin
publisher: IEEE
status: public
title: Fault Effect Modeling in a Heterogeneous SystemC Based Virtual Platform Framework
for Cyber Physical Systems
type: conference
user_id: '5786'
year: '2014'
...
---
_id: '9797'
abstract:
- lang: eng
text: A model approach for wedge/wedge bonding copper wire is presented. The connection
between wire and substrate is based on a variety of physical effects, but the
dominant one is the friction based welding while applying ultrasound. Consequently,
a friction model was used to investigate the welding process. This model is built
up universal and can be used to describe the formation of micro welds in the time
variant contact area between wire and substrate. Aim of the model is to identify
the interactions between touchdown, bond normal force, ultrasonic power and bonding
time. To do so, the contact area is discretized into partial areas where a Point
Contact Model is applied. Based on this approach it is possible to simulate micro
and macro slip inside the contact area between wire and substrate. The work done
by friction force is a main criterion to define occurring micro joints which influence
the subsequent welding.
author:
- first_name: Simon
full_name: Althoff, Simon
last_name: Althoff
- first_name: Jan
full_name: Neuhaus, Jan
last_name: Neuhaus
- first_name: Tobias
full_name: Hemsel, Tobias
id: '210'
last_name: Hemsel
- first_name: Walter
full_name: Sextro, Walter
id: '21220'
last_name: Sextro
citation:
ama: 'Althoff S, Neuhaus J, Hemsel T, Sextro W. A friction based approach for modeling
wire bonding. In: IMAPS 2013, 46th International Symposium on Microelectronics.
Orlando (Florida), USA; 2013. doi:10.4071/isom-2013-TA67'
apa: Althoff, S., Neuhaus, J., Hemsel, T., & Sextro, W. (2013). A friction based
approach for modeling wire bonding. In IMAPS 2013, 46th International Symposium
on Microelectronics. Orlando (Florida), USA. https://doi.org/10.4071/isom-2013-TA67
bibtex: '@inproceedings{Althoff_Neuhaus_Hemsel_Sextro_2013, place={Orlando (Florida),
USA}, title={A friction based approach for modeling wire bonding}, DOI={10.4071/isom-2013-TA67},
booktitle={IMAPS 2013, 46th International Symposium on Microelectronics}, author={Althoff,
Simon and Neuhaus, Jan and Hemsel, Tobias and Sextro, Walter}, year={2013} }'
chicago: Althoff, Simon, Jan Neuhaus, Tobias Hemsel, and Walter Sextro. “A Friction
Based Approach for Modeling Wire Bonding.” In IMAPS 2013, 46th International
Symposium on Microelectronics. Orlando (Florida), USA, 2013. https://doi.org/10.4071/isom-2013-TA67.
ieee: S. Althoff, J. Neuhaus, T. Hemsel, and W. Sextro, “A friction based approach
for modeling wire bonding,” in IMAPS 2013, 46th International Symposium on
Microelectronics, 2013.
mla: Althoff, Simon, et al. “A Friction Based Approach for Modeling Wire Bonding.”
IMAPS 2013, 46th International Symposium on Microelectronics, 2013, doi:10.4071/isom-2013-TA67.
short: 'S. Althoff, J. Neuhaus, T. Hemsel, W. Sextro, in: IMAPS 2013, 46th International
Symposium on Microelectronics, Orlando (Florida), USA, 2013.'
date_created: 2019-05-13T13:55:36Z
date_updated: 2022-01-06T07:04:20Z
department:
- _id: '151'
doi: 10.4071/isom-2013-TA67
keyword:
- Wire bonding
- friction modeling
- wire bond quality
- contact element modeling
language:
- iso: eng
place: Orlando (Florida), USA
publication: IMAPS 2013, 46th International Symposium on Microelectronics
status: public
title: A friction based approach for modeling wire bonding
type: conference
user_id: '55222'
year: '2013'
...