---
_id: '64798'
abstract:
- lang: eng
text: "Lead-containing piezoelectric ceramics are still the base for today’s ultrasonic
transducers used in broad applications. This is partly due to missing powerful
lead-free piezoelectric ceramic parts in the commercial market. There has been
much research on lead-free materials but developing them into marketable parts
seems to be an ongoing process. The actual exemption of ROHS has expired, but
as the new exemption has already been requested, ceramic suppliers keep on selling
lead containing products. Nevertheless, these should be replaced by lead-free
alternatives for environmental and health issues. \r\nThis contribution focuses
on exploring the technological readiness level of lead-free hard piezoceramics
for prestressed ultrasonic transducers. A small series of bolted Langevin transducers
was set up with standard PZT material and three commercial lead-free variants.
Results of the building process from individual ring ceramic characteristics to
transducer load tests are presented. The main finding of this study is that the
lead-free materials technically can compete with the standard PZT for medium-power
applications. Some adaptations in the ultrasonic system must be done: the geometry
must be altered to fit resonance frequency, and higher voltages or thinner ceramics
are needed to achieve the same vibration level at low load. For reaching same
power, the volume of lead-free ceramics must be 1.5 to 3 times larger. As already
promoted in literature, mechanical losses at high vibration levels are smaller
for the lead-free materials. This might help to argument lead-free piezoelectric
materials in some applications.\r\n\r\nReferences\r\n1.\tDirective 2011/65/EU
of the European Parliament and of the Council of 8 June 2011 on the Restriction
of the Use of Certain Hazardous Substances in Electrical and Electronic Equipment.
EUR-Lex Document 02011L0065-20240801. Available online: http://data.europa.eu/eli/dir/2011/65/2024-08-01
(accessed on 24 January 2025).\r\n2.\tLangevin, P. (1918) Method and Apparatus
for Transmitting and Receiving Submarine Elastic Waves Using the Piezoelectric
Properties of Quartz. French Patent Office; Patent No. FR505703.\r\n3.\tHemsel,
T.; Twiefel, J. (2023) Piezoelectric Ultrasonic Power Transducers. In Encyclopedia
of Materials: Electronics; Academic Press: Oxford, UK; pp. 276–285. https://doi.org/10.1016/b978-0-12-819728-8.00047-4.\r\n4.\tATHENA
Technologie Beratung GmbH (2025) Description of Ultrasound Generator. Available
online: http://shop.myathena.de/epages/12074748.sf/de_DE/?ObjectPath=/Shops/12074748/Products/AM200
(accessed on 13 January 2025).\r\n5.\tLittmann, W.; Hemsel, T.; Kauczor, C.; Wallaschek,
J.; Sinha, W. (2003) Load-adaptive phase-controller for resonant driven piezoelectric
devices. Proc. World Congr. Ultrason. 2003, 48, 547–550.\r\n6.\tScheidemann, C.,
Bornmann, P., Littmann, W., & Hemsel, T. (2025). Lead-Free Ceramics in Prestressed
Ultrasonic Transducers. Actuators, 14(2), 55. https://doi.org/10.3390/act14020055\r\n"
author:
- first_name: Claus
full_name: Scheidemann, Claus
id: '38259'
last_name: Scheidemann
- first_name: Peter
full_name: Bornmann, Peter
last_name: Bornmann
- first_name: Walter
full_name: Littmann, Walter
last_name: Littmann
- first_name: Tobias
full_name: Hemsel, Tobias
id: '210'
last_name: Hemsel
citation:
ama: 'Scheidemann C, Bornmann P, Littmann W, Hemsel T. Bolted Langevin transducers
with leadfree piezoelectric ceramics. In: ; 2025.'
apa: Scheidemann, C., Bornmann, P., Littmann, W., & Hemsel, T. (2025). Bolted
Langevin transducers with leadfree piezoelectric ceramics. International Workshop
on Piezoelectric Materials and Applications in Actuators (IWPMA), Vilnius, Lithuania.
bibtex: '@inproceedings{Scheidemann_Bornmann_Littmann_Hemsel_2025, title={Bolted
Langevin transducers with leadfree piezoelectric ceramics}, author={Scheidemann,
Claus and Bornmann, Peter and Littmann, Walter and Hemsel, Tobias}, year={2025}
}'
chicago: Scheidemann, Claus, Peter Bornmann, Walter Littmann, and Tobias Hemsel.
“Bolted Langevin Transducers with Leadfree Piezoelectric Ceramics,” 2025.
ieee: C. Scheidemann, P. Bornmann, W. Littmann, and T. Hemsel, “Bolted Langevin
transducers with leadfree piezoelectric ceramics,” presented at the International
Workshop on Piezoelectric Materials and Applications in Actuators (IWPMA), Vilnius,
Lithuania, 2025.
mla: Scheidemann, Claus, et al. Bolted Langevin Transducers with Leadfree Piezoelectric
Ceramics. 2025.
short: 'C. Scheidemann, P. Bornmann, W. Littmann, T. Hemsel, in: 2025.'
conference:
end_date: 2025-07-03
location: Vilnius, Lithuania
name: International Workshop on Piezoelectric Materials and Applications in Actuators
(IWPMA)
start_date: 2025-07-01
date_created: 2026-03-02T10:39:40Z
date_updated: 2026-03-02T11:04:56Z
ddc:
- '620'
department:
- _id: '151'
file:
- access_level: open_access
content_type: application/pdf
creator: hemsel
date_created: 2026-03-02T10:37:46Z
date_updated: 2026-03-02T11:00:37Z
file_id: '64799'
file_name: IWPMA_2025_Hemsel.pdf
file_size: 1812289
relation: main_file
file_date_updated: 2026-03-02T11:00:37Z
has_accepted_license: '1'
keyword:
- lead free piezoelectric ceramics
- bolted Langevin transducer
- medium power ultrasound.
language:
- iso: eng
oa: '1'
status: public
title: Bolted Langevin transducers with leadfree piezoelectric ceramics
type: conference
user_id: '210'
year: '2025'
...
---
_id: '62643'
author:
- first_name: Tobias
full_name: Schwabe, Tobias
id: '39217'
last_name: Schwabe
- first_name: Christian
full_name: Kress, Christian
id: '13256'
last_name: Kress
orcid: 0000-0002-4403-2237
- first_name: Stephan
full_name: Kruse, Stephan
id: '38254'
last_name: Kruse
- first_name: Maxim
full_name: Weizel, Maxim
id: '44271'
last_name: Weizel
orcid: 0000-0003-2699-9839
- first_name: Hanjo
full_name: Rhee, Hanjo
last_name: Rhee
- first_name: J. Christoph
full_name: Scheytt, J. Christoph
id: '37144'
last_name: Scheytt
orcid: '0000-0002-5950-6618 '
citation:
ama: Schwabe T, Kress C, Kruse S, Weizel M, Rhee H, Scheytt JC. Forward-Biased Silicon
Phase Shifter Modeling for Electronic-Photonic Co-Simulation and Validation in
a 250 nm EPIC BiCMOS Technology. Journal of Lightwave Technology. 2025;43(1):255-270.
doi:10.1109/JLT.2024.3450949
apa: Schwabe, T., Kress, C., Kruse, S., Weizel, M., Rhee, H., & Scheytt, J.
C. (2025). Forward-Biased Silicon Phase Shifter Modeling for Electronic-Photonic
Co-Simulation and Validation in a 250 nm EPIC BiCMOS Technology. Journal of
Lightwave Technology, 43(1), 255–270. https://doi.org/10.1109/JLT.2024.3450949
bibtex: '@article{Schwabe_Kress_Kruse_Weizel_Rhee_Scheytt_2025, title={Forward-Biased
Silicon Phase Shifter Modeling for Electronic-Photonic Co-Simulation and Validation
in a 250 nm EPIC BiCMOS Technology}, volume={43}, DOI={10.1109/JLT.2024.3450949},
number={1}, journal={Journal of Lightwave Technology}, author={Schwabe, Tobias
and Kress, Christian and Kruse, Stephan and Weizel, Maxim and Rhee, Hanjo and
Scheytt, J. Christoph}, year={2025}, pages={255–270} }'
chicago: 'Schwabe, Tobias, Christian Kress, Stephan Kruse, Maxim Weizel, Hanjo Rhee,
and J. Christoph Scheytt. “Forward-Biased Silicon Phase Shifter Modeling for Electronic-Photonic
Co-Simulation and Validation in a 250 Nm EPIC BiCMOS Technology.” Journal of
Lightwave Technology 43, no. 1 (2025): 255–70. https://doi.org/10.1109/JLT.2024.3450949.'
ieee: 'T. Schwabe, C. Kress, S. Kruse, M. Weizel, H. Rhee, and J. C. Scheytt, “Forward-Biased
Silicon Phase Shifter Modeling for Electronic-Photonic Co-Simulation and Validation
in a 250 nm EPIC BiCMOS Technology,” Journal of Lightwave Technology, vol.
43, no. 1, pp. 255–270, 2025, doi: 10.1109/JLT.2024.3450949.'
mla: Schwabe, Tobias, et al. “Forward-Biased Silicon Phase Shifter Modeling for
Electronic-Photonic Co-Simulation and Validation in a 250 Nm EPIC BiCMOS Technology.”
Journal of Lightwave Technology, vol. 43, no. 1, 2025, pp. 255–70, doi:10.1109/JLT.2024.3450949.
short: T. Schwabe, C. Kress, S. Kruse, M. Weizel, H. Rhee, J.C. Scheytt, Journal
of Lightwave Technology 43 (2025) 255–270.
date_created: 2025-11-27T07:14:34Z
date_updated: 2025-11-27T07:16:01Z
department:
- _id: '58'
doi: 10.1109/JLT.2024.3450949
intvolume: ' 43'
issue: '1'
keyword:
- Integrated circuit modeling
- Capacitance
- Silicon
- Modulation
- Adaptation models
- Semiconductor device modeling
- Bandwidth
- Data communication
- electrooptical transmitter
- equalization
- free-carrier-plasma dispersion effect
- modelling
- optical modulator
- phase shifter
- silicon photonics
language:
- iso: eng
page: 255-270
publication: Journal of Lightwave Technology
status: public
title: Forward-Biased Silicon Phase Shifter Modeling for Electronic-Photonic Co-Simulation
and Validation in a 250 nm EPIC BiCMOS Technology
type: journal_article
user_id: '38254'
volume: 43
year: '2025'
...
---
_id: '62644'
author:
- first_name: Tobias
full_name: Schwabe, Tobias
id: '39217'
last_name: Schwabe
- first_name: Christian
full_name: Kress, Christian
id: '13256'
last_name: Kress
orcid: 0000-0002-4403-2237
- first_name: Babak
full_name: Sadiye, Babak
id: '93634'
last_name: Sadiye
- first_name: Stephan
full_name: Kruse, Stephan
id: '38254'
last_name: Kruse
- first_name: J. Christoph
full_name: Scheytt, J. Christoph
id: '37144'
last_name: Scheytt
orcid: '0000-0002-5950-6618 '
citation:
ama: Schwabe T, Kress C, Sadiye B, Kruse S, Scheytt JC. Analysis and Design of Forward
Biased Silicon Photonics Phase Shifter Equalizer Circuits. IEEE Access.
2025;13:192433-192450. doi:10.1109/ACCESS.2025.3629385
apa: Schwabe, T., Kress, C., Sadiye, B., Kruse, S., & Scheytt, J. C. (2025).
Analysis and Design of Forward Biased Silicon Photonics Phase Shifter Equalizer
Circuits. IEEE Access, 13, 192433–192450. https://doi.org/10.1109/ACCESS.2025.3629385
bibtex: '@article{Schwabe_Kress_Sadiye_Kruse_Scheytt_2025, title={Analysis and Design
of Forward Biased Silicon Photonics Phase Shifter Equalizer Circuits}, volume={13},
DOI={10.1109/ACCESS.2025.3629385},
journal={IEEE Access}, author={Schwabe, Tobias and Kress, Christian and Sadiye,
Babak and Kruse, Stephan and Scheytt, J. Christoph}, year={2025}, pages={192433–192450}
}'
chicago: 'Schwabe, Tobias, Christian Kress, Babak Sadiye, Stephan Kruse, and J.
Christoph Scheytt. “Analysis and Design of Forward Biased Silicon Photonics Phase
Shifter Equalizer Circuits.” IEEE Access 13 (2025): 192433–50. https://doi.org/10.1109/ACCESS.2025.3629385.'
ieee: 'T. Schwabe, C. Kress, B. Sadiye, S. Kruse, and J. C. Scheytt, “Analysis and
Design of Forward Biased Silicon Photonics Phase Shifter Equalizer Circuits,”
IEEE Access, vol. 13, pp. 192433–192450, 2025, doi: 10.1109/ACCESS.2025.3629385.'
mla: Schwabe, Tobias, et al. “Analysis and Design of Forward Biased Silicon Photonics
Phase Shifter Equalizer Circuits.” IEEE Access, vol. 13, 2025, pp. 192433–50,
doi:10.1109/ACCESS.2025.3629385.
short: T. Schwabe, C. Kress, B. Sadiye, S. Kruse, J.C. Scheytt, IEEE Access 13 (2025)
192433–192450.
date_created: 2025-11-27T07:14:48Z
date_updated: 2025-11-27T07:16:06Z
department:
- _id: '58'
doi: 10.1109/ACCESS.2025.3629385
intvolume: ' 13'
keyword:
- Optical attenuators
- Equalizers
- Phase shifters
- Optical modulation
- Electro-optic modulators
- Optical amplifiers
- Circuits
- Silicon photonics
- Optical saturation
- Integrated circuit modeling
- Data communication
- equalization
- electro-optical transmitter
- silicon photonics
- phase shifter
- optical modulator
- free-carrier plasma dispersion effect
- driver architectures
- biasing schemes
language:
- iso: eng
page: 192433-192450
publication: IEEE Access
status: public
title: Analysis and Design of Forward Biased Silicon Photonics Phase Shifter Equalizer
Circuits
type: journal_article
user_id: '38254'
volume: 13
year: '2025'
...
---
_id: '49873'
abstract:
- lang: eng
text: This study analyzes the impact of tax complexity on the location of tax employees
and tax risk. Using a hand-collected dataset of more than 7,500 tax employees
from 348 European-listed multinationals, we identify two types of firm-level costs
associated with tax complexity—tax employees, and tax risk. We find that firms
locate more tax employees in countries with greater tax complexity. This association
is particularly pronounced for complexity in tax procedures. We also find that
multinationals operating in countries with high tax complexity are associated
with higher tax risk. The incremental tax risk vanishes for firms that locate
more tax employees in countries with highly complex tax procedures, while we find
no risk reduction from additional tax employees in countries with complex tax
rules. Our results reveal that multinationals eliminate 25 percent of overall
tax complexity-related tax risk through targeted location of tax employees.
author:
- first_name: Henning
full_name: Giese, Henning
id: '92812'
last_name: Giese
- first_name: Reinald
full_name: Koch, Reinald
last_name: Koch
- first_name: Caren
full_name: Sureth-Sloane, Caren
id: '530'
last_name: Sureth-Sloane
orcid: ' 0000-0002-8183-5901'
citation:
ama: Giese H, Koch R, Sureth-Sloane C. Where to Locate Tax Employees? The Role
of Tax Complexity and Tax Risk Implications.; 2024. doi:10.2139/ssrn.4888151
apa: Giese, H., Koch, R., & Sureth-Sloane, C. (2024). Where to Locate Tax
Employees? The Role of Tax Complexity and Tax Risk Implications. https://doi.org/10.2139/ssrn.4888151
bibtex: '@book{Giese_Koch_Sureth-Sloane_2024, series={TRR 266 Accounting for Transparency
Working Paper Series No. 149}, title={Where to Locate Tax Employees? The Role
of Tax Complexity and Tax Risk Implications}, DOI={10.2139/ssrn.4888151},
author={Giese, Henning and Koch, Reinald and Sureth-Sloane, Caren}, year={2024},
collection={TRR 266 Accounting for Transparency Working Paper Series No. 149}
}'
chicago: Giese, Henning, Reinald Koch, and Caren Sureth-Sloane. Where to Locate
Tax Employees? The Role of Tax Complexity and Tax Risk Implications. TRR 266
Accounting for Transparency Working Paper Series No. 149, 2024. https://doi.org/10.2139/ssrn.4888151.
ieee: H. Giese, R. Koch, and C. Sureth-Sloane, Where to Locate Tax Employees?
The Role of Tax Complexity and Tax Risk Implications. 2024.
mla: Giese, Henning, et al. Where to Locate Tax Employees? The Role of Tax Complexity
and Tax Risk Implications. 2024, doi:10.2139/ssrn.4888151.
short: H. Giese, R. Koch, C. Sureth-Sloane, Where to Locate Tax Employees? The Role
of Tax Complexity and Tax Risk Implications, 2024.
date_created: 2023-12-19T13:22:08Z
date_updated: 2024-12-07T14:13:15Z
department:
- _id: '187'
doi: 10.2139/ssrn.4888151
keyword:
- tax complexity
- tax complexity cost
- tax department
- tax employees
- tax risk
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://papers.ssrn.com/sol3/papers.cfm?abstract_id=4888151
oa: '1'
publication_status: published
series_title: TRR 266 Accounting for Transparency Working Paper Series No. 149
status: public
title: Where to Locate Tax Employees? The Role of Tax Complexity and Tax Risk Implications
type: working_paper
user_id: '530'
year: '2024'
...
---
_id: '30917'
abstract:
- lang: eng
text: "We study lobby group formation in a two-stage model where the players \x1Crst
form lobby\r\ngroups that then engage in a rent-seeking contest to in\x1Duence
the legislator. However, the\r\noutcome of the contest a\eects all players according
to the ideological distance between the\r\nimplemented policy and the players'
preferences. The players can either lobby by themselves,\r\nform a coalition of
lobbyists or free ride. We \x1Cnd that free coalition formation is reasonable\r\nif
either players with moderate preferences face lobby groups with extreme preferences,
or if\r\nthere are two opposing coalitions with an equal number of members. Otherwise,
there are\r\nalways free riders among the players."
article_type: original
author:
- first_name: Lukas
full_name: Block, Lukas
id: '22527'
last_name: Block
citation:
ama: Block L. Coalition formation versus free riding in rent-seeking contests. Quick
And Easy Journal Title. Published online 2022.
apa: Block, L. (2022). Coalition formation versus free riding in rent-seeking contests.
Quick And Easy Journal Title.
bibtex: '@article{Block_2022, title={Coalition formation versus free riding in rent-seeking
contests}, journal={Quick And Easy Journal Title}, author={Block, Lukas}, year={2022}
}'
chicago: Block, Lukas. “Coalition Formation versus Free Riding in Rent-Seeking Contests.”
Quick And Easy Journal Title, 2022.
ieee: L. Block, “Coalition formation versus free riding in rent-seeking contests,”
Quick And Easy Journal Title, 2022.
mla: Block, Lukas. “Coalition Formation versus Free Riding in Rent-Seeking Contests.”
Quick And Easy Journal Title, 2022.
short: L. Block, Quick And Easy Journal Title (2022).
date_created: 2022-04-19T15:06:55Z
date_updated: 2022-04-19T15:09:44Z
ddc:
- '330'
file:
- access_level: open_access
content_type: application/pdf
creator: lblock
date_created: 2022-04-19T15:06:49Z
date_updated: 2022-04-19T15:06:49Z
file_id: '30918'
file_name: Coalition formation versus free riding in rent-seeking contests.pdf
file_size: 270316
relation: main_file
file_date_updated: 2022-04-19T15:06:49Z
has_accepted_license: '1'
jel:
- C71
- D72
- D74
keyword:
- Group formation
- Rent-seeking
- Free riding
language:
- iso: eng
oa: '1'
publication: Quick And Easy Journal Title
status: public
title: Coalition formation versus free riding in rent-seeking contests
type: journal_article
user_id: '22527'
year: '2022'
...
---
_id: '29803'
abstract:
- lang: eng
text: "Ultrasonic wire bonding is a solid-state joining process used to form electrical
interconnections in micro and\r\npower electronics and batteries. A high frequency
oscillation causes a metallurgical bond deformation in\r\nthe contact area. Due
to the numerous physical influencing factors, it is very difficult to accurately
capture\r\nthis process in a model. Therefore, our goal is to determine a suitable
feed-forward control strategy for the\r\nbonding process even without detailed
model knowledge. We propose the use of batch constrained Bayesian\r\noptimization
for the control design. Hence, Bayesian optimization is precisely adapted to the
application of\r\nbonding: the constraint is used to check one quality feature
of the process and the use of batches leads to\r\nmore efficient experiments.
Our approach is suitable to determine a feed-forward control for the bonding\r\nprocess
that provides very high quality bonds without using a physical model. We also
show that the quality\r\nof the Bayesian optimization based control outperforms
random search as well as manual search by a user.\r\nUsing a simple prior knowledge
model derived from data further improves the quality of the connection.\r\nThe
Bayesian optimization approach offers the possibility to perform a sensitivity
analysis of the control\r\nparameters, which allows to evaluate the influence
of each control parameter on the bond quality. In summary,\r\nBayesian optimization
applied to the bonding process provides an excellent opportunity to develop a
feedforward\r\ncontrol without full modeling of the underlying physical processes."
author:
- first_name: Michael
full_name: Hesse, Michael
id: '29222'
last_name: Hesse
- first_name: Matthias
full_name: Hunstig, Matthias
last_name: Hunstig
- first_name: Julia
full_name: Timmermann, Julia
id: '15402'
last_name: Timmermann
- first_name: Ansgar
full_name: Trächtler, Ansgar
id: '552'
last_name: Trächtler
citation:
ama: 'Hesse M, Hunstig M, Timmermann J, Trächtler A. Batch Constrained Bayesian
Optimization for UltrasonicWire Bonding Feed-forward Control Design. In: Proceedings
of the 11th International Conference on Pattern Recognition Applications and Methods
(ICPRAM). ; 2022:383-394.'
apa: Hesse, M., Hunstig, M., Timmermann, J., & Trächtler, A. (2022). Batch Constrained
Bayesian Optimization for UltrasonicWire Bonding Feed-forward Control Design.
Proceedings of the 11th International Conference on Pattern Recognition Applications
and Methods (ICPRAM), 383–394.
bibtex: '@inproceedings{Hesse_Hunstig_Timmermann_Trächtler_2022, title={Batch Constrained
Bayesian Optimization for UltrasonicWire Bonding Feed-forward Control Design},
booktitle={Proceedings of the 11th International Conference on Pattern Recognition
Applications and Methods (ICPRAM)}, author={Hesse, Michael and Hunstig, Matthias
and Timmermann, Julia and Trächtler, Ansgar}, year={2022}, pages={383–394} }'
chicago: Hesse, Michael, Matthias Hunstig, Julia Timmermann, and Ansgar Trächtler.
“Batch Constrained Bayesian Optimization for UltrasonicWire Bonding Feed-Forward
Control Design.” In Proceedings of the 11th International Conference on Pattern
Recognition Applications and Methods (ICPRAM), 383–94, 2022.
ieee: M. Hesse, M. Hunstig, J. Timmermann, and A. Trächtler, “Batch Constrained
Bayesian Optimization for UltrasonicWire Bonding Feed-forward Control Design,”
in Proceedings of the 11th International Conference on Pattern Recognition
Applications and Methods (ICPRAM), Online, 2022, pp. 383–394.
mla: Hesse, Michael, et al. “Batch Constrained Bayesian Optimization for UltrasonicWire
Bonding Feed-Forward Control Design.” Proceedings of the 11th International
Conference on Pattern Recognition Applications and Methods (ICPRAM), 2022,
pp. 383–94.
short: 'M. Hesse, M. Hunstig, J. Timmermann, A. Trächtler, in: Proceedings of the
11th International Conference on Pattern Recognition Applications and Methods
(ICPRAM), 2022, pp. 383–394.'
conference:
end_date: 2022-02-05
location: Online
name: 11th International Conference on Pattern Recognition Applications and Methods
start_date: 2022-02-03
date_created: 2022-02-09T12:50:25Z
date_updated: 2024-11-13T08:44:17Z
department:
- _id: '153'
- _id: '880'
keyword:
- Bayesian optimization
- Wire bonding
- Feed-forward control
- model-free design
language:
- iso: eng
page: 383-394
publication: Proceedings of the 11th International Conference on Pattern Recognition
Applications and Methods (ICPRAM)
publication_identifier:
isbn:
- 978-989-758-549-4
quality_controlled: '1'
status: public
title: Batch Constrained Bayesian Optimization for UltrasonicWire Bonding Feed-forward
Control Design
type: conference
user_id: '82875'
year: '2022'
...
---
_id: '37136'
abstract:
- lang: eng
text: This study examines the relation between voluntary audit and the cost of debt
in private firms. We use a sample of 4,058 small private firms operating in the
period 2006‐2017 that are not subject to mandatory audits. Firms decide for a
voluntary audit of financial statements either because the economic setting in
which they operate effectively forces them to do so (e.g., ownership complexity,
export‐oriented supply chain, subsidiary status) or because firm fundamentals
and/or financial reporting practices limit their access to financial debt, both
reflected in earnings quality. We use these factors to model the decision for
voluntary audit. In the outcome analyses, we find robust evidence that voluntary
audits are associated with higher, rather than lower, interest rate by up to 3.0
percentage points. This effect is present regardless of the perceived audit quality
(Big‐4 vs. non‐Big‐4), but is stronger for non‐Big‐4 audits where auditees have
a stronger position relative to auditors. Audited firms’ earnings are less informative
about future operating performance relative to unaudited counterparts. We conclude
that voluntary audits facilitate access to financial debt for firms with higher
risk that may otherwise have no access to this form of financing. The price paid
is reflected in higher interest rates charged to firms with voluntary audits –
firms with higher information and/or fundamental risk.
author:
- first_name: Riste
full_name: Ichev, Riste
last_name: Ichev
- first_name: Jernej
full_name: Koren, Jernej
last_name: Koren
- first_name: Urska
full_name: Kosi, Urska
id: '54068'
last_name: Kosi
- first_name: Katarina
full_name: Sitar Sustar, Katarina
last_name: Sitar Sustar
- first_name: Aljosa
full_name: Valentincic, Aljosa
last_name: Valentincic
citation:
ama: 'Ichev R, Koren J, Kosi U, Sitar Sustar K, Valentincic A. Cost of Debt for
Private Firms Revisited: Voluntary Audits as a Reflection of Risk.; 2021.'
apa: 'Ichev, R., Koren, J., Kosi, U., Sitar Sustar, K., & Valentincic, A. (2021).
Cost of Debt for Private Firms Revisited: Voluntary Audits as a Reflection
of Risk.'
bibtex: '@book{Ichev_Koren_Kosi_Sitar Sustar_Valentincic_2021, title={Cost of Debt
for Private Firms Revisited: Voluntary Audits as a Reflection of Risk}, author={Ichev,
Riste and Koren, Jernej and Kosi, Urska and Sitar Sustar, Katarina and Valentincic,
Aljosa}, year={2021} }'
chicago: 'Ichev, Riste, Jernej Koren, Urska Kosi, Katarina Sitar Sustar, and Aljosa
Valentincic. Cost of Debt for Private Firms Revisited: Voluntary Audits as
a Reflection of Risk, 2021.'
ieee: 'R. Ichev, J. Koren, U. Kosi, K. Sitar Sustar, and A. Valentincic, Cost
of Debt for Private Firms Revisited: Voluntary Audits as a Reflection of Risk.
2021.'
mla: 'Ichev, Riste, et al. Cost of Debt for Private Firms Revisited: Voluntary
Audits as a Reflection of Risk. 2021.'
short: 'R. Ichev, J. Koren, U. Kosi, K. Sitar Sustar, A. Valentincic, Cost of Debt
for Private Firms Revisited: Voluntary Audits as a Reflection of Risk, 2021.'
date_created: 2023-01-17T15:03:08Z
date_updated: 2023-01-18T13:40:40Z
department:
- _id: '635'
- _id: '186'
- _id: '551'
keyword:
- private firms
- voluntary audit
- cost of debt
- self‐selection bias
- risk
language:
- iso: eng
main_file_link:
- url: https://papers.ssrn.com/sol3/papers.cfm?abstract_id=3853927
status: public
title: 'Cost of Debt for Private Firms Revisited: Voluntary Audits as a Reflection
of Risk'
type: working_paper
user_id: '88603'
year: '2021'
...
---
_id: '25212'
abstract:
- lang: eng
text: "Finding a good query plan is key to the optimization of query runtime. This
holds in particular for cost-based federation\r\nengines, which make use of cardinality
estimations to achieve this goal. A number of studies compare SPARQL federation
engines across different performance metrics, including query runtime, result
set completeness and correctness, number of sources selected and number of requests
sent. Albeit informative, these metrics are generic and unable to quantify and
evaluate the accuracy of the cardinality estimators of cost-based federation engines.
To thoroughly evaluate cost-based federation engines, the effect of estimated
cardinality errors on the overall query runtime performance must be measured.
In this paper, we address this challenge by presenting novel evaluation metrics
targeted at a fine-grained benchmarking of cost-based federated SPARQL query engines.
We evaluate five cost-based federated SPARQL query engines using existing as well
as novel evaluation metrics by using LargeRDFBench queries. Our results provide
a detailed analysis of the experimental outcomes that reveal novel insights, useful
for the development of future cost-based federated SPARQL query processing engines."
article_type: original
author:
- first_name: Umair
full_name: Qudus, Umair
id: '83392'
last_name: Qudus
orcid: 0000-0001-6714-8729
- first_name: Muhammad
full_name: Saleem, Muhammad
last_name: Saleem
- first_name: Axel-Cyrille
full_name: Ngonga Ngomo, Axel-Cyrille
id: '65716'
last_name: Ngonga Ngomo
- first_name: Young-Koo
full_name: Lee, Young-Koo
last_name: Lee
citation:
ama: Qudus U, Saleem M, Ngonga Ngomo A-C, Lee Y-K. An Empirical Evaluation of Cost-based
Federated SPARQL Query Processing Engines. Semantic Web. 12(6):843-868.
doi:10.3233/SW-200420
apa: Qudus, U., Saleem, M., Ngonga Ngomo, A.-C., & Lee, Y.-K. (n.d.). An Empirical
Evaluation of Cost-based Federated SPARQL Query Processing Engines. Semantic
Web, 12(6), 843–868. https://doi.org/10.3233/SW-200420
bibtex: '@article{Qudus_Saleem_Ngonga Ngomo_Lee, title={An Empirical Evaluation
of Cost-based Federated SPARQL Query Processing Engines}, volume={12}, DOI={10.3233/SW-200420}, number={6}, journal={Semantic
Web}, publisher={ISO Press}, author={Qudus, Umair and Saleem, Muhammad and Ngonga
Ngomo, Axel-Cyrille and Lee, Young-Koo}, pages={843–868} }'
chicago: 'Qudus, Umair, Muhammad Saleem, Axel-Cyrille Ngonga Ngomo, and Young-Koo
Lee. “An Empirical Evaluation of Cost-Based Federated SPARQL Query Processing
Engines.” Semantic Web 12, no. 6 (n.d.): 843–68. https://doi.org/10.3233/SW-200420.'
ieee: 'U. Qudus, M. Saleem, A.-C. Ngonga Ngomo, and Y.-K. Lee, “An Empirical Evaluation
of Cost-based Federated SPARQL Query Processing Engines,” Semantic Web,
vol. 12, no. 6, pp. 843–868, doi: 10.3233/SW-200420.'
mla: Qudus, Umair, et al. “An Empirical Evaluation of Cost-Based Federated SPARQL
Query Processing Engines.” Semantic Web, vol. 12, no. 6, ISO Press, pp.
843–68, doi:10.3233/SW-200420.
short: U. Qudus, M. Saleem, A.-C. Ngonga Ngomo, Y.-K. Lee, Semantic Web 12 (n.d.)
843–868.
date_created: 2021-10-01T06:52:52Z
date_updated: 2025-09-11T09:50:14Z
ddc:
- '000'
department:
- _id: '574'
doi: 10.3233/SW-200420
file:
- access_level: closed
content_type: application/pdf
creator: uqudus
date_created: 2024-01-13T11:35:53Z
date_updated: 2024-01-13T11:35:53Z
file_id: '50483'
file_name: swj2604.pdf
file_size: 978478
relation: main_file
success: 1
file_date_updated: 2024-01-13T11:35:53Z
has_accepted_license: '1'
intvolume: ' 12'
issue: '6'
keyword:
- SPARQL
- benchmarking
- cost-based
- cost-free
- federated
- querying
language:
- iso: eng
license: https://creativecommons.org/publicdomain/zero/1.0/
page: 843-868
project:
- _id: '410'
name: 'KnowGraphs: KnowGraphs: Knowledge Graphs at Scale'
publication: Semantic Web
publication_identifier:
issn:
- 2210-4968
publication_status: accepted
publisher: ISO Press
status: public
title: An Empirical Evaluation of Cost-based Federated SPARQL Query Processing Engines
type: journal_article
user_id: '83392'
volume: 12
year: '2021'
...
---
_id: '64018'
abstract:
- lang: eng
text: CO oxidation is an extensively studied reaction in heterogeneous catalysis
due to its seeming simplicity and its great importance for emission control. However,
the role of particle size and more specifically structure sensitivity in this
reaction is still controversial. In the present study, colloidal “surfactant-free”
Pt nanoparticles (NPs) in a size regime of 1–4 nm with narrow size distribution
and control over particle size were synthesized and subsequently supported on
Al2O3 to prepare model catalysts. CO oxidation was performed using Pt NPs catalysts
with particles sizes of 1, 2, 3, and 4 nm at different reaction temperatures.
It is shown that the reaction exhibits a particle size effect that depends strongly
on the reaction conditions. At 170 °C, the reaction seems to proceed within the
same kinetic regime for all particle sizes, but the surface normalized activity
depends strongly on the particle size, with maximum activity for nanoparticles
2 nm in diameter. A temperature increase to 200 °C leads to a change of the kinetic
regime that depends on the particle size. For Pt NPs 1 nm in diameter a reaction
order of 1 for O2 was observed, indicating that O2 adsorbs molecularly and dissociates
in a following step, which represents the generally accepted mechanism on Pt surfaces.
The reaction order of −1 for CO demonstrates that the surface is saturated with
CO under reaction conditions. With increasing particle size, the reaction orders
of O2 and CO change. For particles 2 nm in size, an increase in temperature also
results in reaction orders of 1 for O2 and −1 for CO; NPs of 3 and 4 nm, even
at higher temperatures, show no clear kinetic behavior that can be explained by
a single reaction mechanism. Instead, the Boudouard reaction between two adjacent
adsorbed CO molecules was identified as an important additional reaction pathway
that occurs preferentially on large particles and causes more complex kinetics.
author:
- first_name: Sarah
full_name: Neumann, Sarah
last_name: Neumann
- first_name: Torsten
full_name: Gutmann, Torsten
id: '118165'
last_name: Gutmann
- first_name: Gerd
full_name: Buntkowsky, Gerd
last_name: Buntkowsky
- first_name: Stephen
full_name: Paul, Stephen
last_name: Paul
- first_name: Greg
full_name: Thiele, Greg
last_name: Thiele
- first_name: Heiko
full_name: Sievers, Heiko
last_name: Sievers
- first_name: Marcus
full_name: Bäumer, Marcus
last_name: Bäumer
- first_name: Sebastian
full_name: Kunz, Sebastian
last_name: Kunz
citation:
ama: Neumann S, Gutmann T, Buntkowsky G, et al. Insights into the reaction mechanism
and particle size effects of CO oxidation over supported Pt nanoparticle catalysts.
Journal of Catalysis. 2019;377:662–672. doi:10.1016/j.jcat.2019.07.049
apa: Neumann, S., Gutmann, T., Buntkowsky, G., Paul, S., Thiele, G., Sievers, H.,
Bäumer, M., & Kunz, S. (2019). Insights into the reaction mechanism and particle
size effects of CO oxidation over supported Pt nanoparticle catalysts. Journal
of Catalysis, 377, 662–672. https://doi.org/10.1016/j.jcat.2019.07.049
bibtex: '@article{Neumann_Gutmann_Buntkowsky_Paul_Thiele_Sievers_Bäumer_Kunz_2019,
title={Insights into the reaction mechanism and particle size effects of CO oxidation
over supported Pt nanoparticle catalysts}, volume={377}, DOI={10.1016/j.jcat.2019.07.049},
journal={Journal of Catalysis}, author={Neumann, Sarah and Gutmann, Torsten and
Buntkowsky, Gerd and Paul, Stephen and Thiele, Greg and Sievers, Heiko and Bäumer,
Marcus and Kunz, Sebastian}, year={2019}, pages={662–672} }'
chicago: 'Neumann, Sarah, Torsten Gutmann, Gerd Buntkowsky, Stephen Paul, Greg Thiele,
Heiko Sievers, Marcus Bäumer, and Sebastian Kunz. “Insights into the Reaction
Mechanism and Particle Size Effects of CO Oxidation over Supported Pt Nanoparticle
Catalysts.” Journal of Catalysis 377 (2019): 662–672. https://doi.org/10.1016/j.jcat.2019.07.049.'
ieee: 'S. Neumann et al., “Insights into the reaction mechanism and particle
size effects of CO oxidation over supported Pt nanoparticle catalysts,” Journal
of Catalysis, vol. 377, pp. 662–672, 2019, doi: 10.1016/j.jcat.2019.07.049.'
mla: Neumann, Sarah, et al. “Insights into the Reaction Mechanism and Particle Size
Effects of CO Oxidation over Supported Pt Nanoparticle Catalysts.” Journal
of Catalysis, vol. 377, 2019, pp. 662–672, doi:10.1016/j.jcat.2019.07.049.
short: S. Neumann, T. Gutmann, G. Buntkowsky, S. Paul, G. Thiele, H. Sievers, M.
Bäumer, S. Kunz, Journal of Catalysis 377 (2019) 662–672.
date_created: 2026-02-07T16:02:06Z
date_updated: 2026-02-17T16:14:45Z
doi: 10.1016/j.jcat.2019.07.049
extern: '1'
intvolume: ' 377'
keyword:
- Solid state NMR
- “Surfactant-free” platinum nanoparticles
- CO oxidation
- Particle size effect
- Structure sensitivity
language:
- iso: eng
page: 662–672
publication: Journal of Catalysis
status: public
title: Insights into the reaction mechanism and particle size effects of CO oxidation
over supported Pt nanoparticle catalysts
type: journal_article
user_id: '100715'
volume: 377
year: '2019'
...
---
_id: '59220'
author:
- first_name: Tobias
full_name: Schwabe, Tobias
id: '39217'
last_name: Schwabe
- first_name: Axel
full_name: Balke, Axel
last_name: Balke
- first_name: Petrone H.
full_name: Bezuidenhout, Petrone H.
last_name: Bezuidenhout
- first_name: Julia
full_name: Reker, Julia
last_name: Reker
- first_name: Thorsten
full_name: Meyers, Thorsten
last_name: Meyers
- first_name: Trudi-Heleen
full_name: Joubert, Trudi-Heleen
last_name: Joubert
- first_name: Ulrich
full_name: Hilleringmann, Ulrich
id: '20179'
last_name: Hilleringmann
citation:
ama: 'Schwabe T, Balke A, Bezuidenhout PH, et al. Oxygen detection with zinc oxide
nanoparticle structures. In: du Plessis M, ed. Fifth Conference on Sensors,
MEMS, and Electro-Optic Systems. Vol 11043. SPIE; 2019:1104316. doi:10.1117/12.2501507'
apa: Schwabe, T., Balke, A., Bezuidenhout, P. H., Reker, J., Meyers, T., Joubert,
T.-H., & Hilleringmann, U. (2019). Oxygen detection with zinc oxide nanoparticle
structures. In M. du Plessis (Ed.), Fifth Conference on Sensors, MEMS, and
Electro-Optic Systems (Vol. 11043, p. 1104316). SPIE. https://doi.org/10.1117/12.2501507
bibtex: '@inproceedings{Schwabe_Balke_Bezuidenhout_Reker_Meyers_Joubert_Hilleringmann_2019,
title={Oxygen detection with zinc oxide nanoparticle structures}, volume={11043},
DOI={10.1117/12.2501507}, booktitle={Fifth
Conference on Sensors, MEMS, and Electro-Optic Systems}, publisher={SPIE}, author={Schwabe,
Tobias and Balke, Axel and Bezuidenhout, Petrone H. and Reker, Julia and Meyers,
Thorsten and Joubert, Trudi-Heleen and Hilleringmann, Ulrich}, editor={du Plessis,
Monuko}, year={2019}, pages={1104316} }'
chicago: Schwabe, Tobias, Axel Balke, Petrone H. Bezuidenhout, Julia Reker, Thorsten
Meyers, Trudi-Heleen Joubert, and Ulrich Hilleringmann. “Oxygen Detection with
Zinc Oxide Nanoparticle Structures.” In Fifth Conference on Sensors, MEMS,
and Electro-Optic Systems, edited by Monuko du Plessis, 11043:1104316. SPIE,
2019. https://doi.org/10.1117/12.2501507.
ieee: 'T. Schwabe et al., “Oxygen detection with zinc oxide nanoparticle
structures,” in Fifth Conference on Sensors, MEMS, and Electro-Optic Systems,
2019, vol. 11043, p. 1104316, doi: 10.1117/12.2501507.'
mla: Schwabe, Tobias, et al. “Oxygen Detection with Zinc Oxide Nanoparticle Structures.”
Fifth Conference on Sensors, MEMS, and Electro-Optic Systems, edited by
Monuko du Plessis, vol. 11043, SPIE, 2019, p. 1104316, doi:10.1117/12.2501507.
short: 'T. Schwabe, A. Balke, P.H. Bezuidenhout, J. Reker, T. Meyers, T.-H. Joubert,
U. Hilleringmann, in: M. du Plessis (Ed.), Fifth Conference on Sensors, MEMS,
and Electro-Optic Systems, SPIE, 2019, p. 1104316.'
date_created: 2025-03-31T16:06:43Z
date_updated: 2025-04-02T11:34:07Z
doi: 10.1117/12.2501507
editor:
- first_name: Monuko
full_name: du Plessis, Monuko
last_name: du Plessis
intvolume: ' 11043'
keyword:
- sensing
- zinc oxide
- thin-film transistor
- oxygen measurement
- low-cost electronics
- water quality analysis
- printable electronics
- flexible electronics
language:
- iso: eng
page: '1104316'
publication: Fifth Conference on Sensors, MEMS, and Electro-Optic Systems
publisher: SPIE
status: public
title: Oxygen detection with zinc oxide nanoparticle structures
type: conference
user_id: '39217'
volume: 11043
year: '2019'
...
---
_id: '4947'
abstract:
- lang: eng
text: Manufacturers increasingly integrate information and communication technologies
into their products so that they can provide IT-based services. Organizations
that formerly concentrated on transactional sales thus confront a new challenge
associated with managing service usage—retention and extracting value from investments
in smart technology. This study combines a marketing and an information systems
perspective in a field study conducted jointly with a large European car manufacturer.
Understanding the renewal decision for IT-based service contracts requires knowledge
from both disciplines. The paper shows that combining behavioral predictor variables
stemming from marketing research and technology-related perceptual variables stemming
from technology acceptance research increases the explanatory power and prediction
accuracy of forecasting models for customer renewal decisions. Specifically, the
authors show that perceptions of usefulness become more important the longer customers
use IT-based services and the more services they use within the service contract.
article_type: original
author:
- first_name: Florian v
full_name: Wangenheim, Florian v
last_name: Wangenheim
- first_name: Nancy
full_name: Wünderlich, Nancy
id: '36392'
last_name: Wünderlich
- first_name: Jan H
full_name: Schumann, Jan H
last_name: Schumann
citation:
ama: Wangenheim F v, Wünderlich N, Schumann JH. Renew or cancel? Drivers of customer
renewal decisions for IT-based service contracts. Journal of Business Research.
2017;(79):181--188.
apa: Wangenheim, F. v, Wünderlich, N., & Schumann, J. H. (2017). Renew or cancel?
Drivers of customer renewal decisions for IT-based service contracts. Journal
of Business Research, (79), 181--188.
bibtex: '@article{Wangenheim_Wünderlich_Schumann_2017, title={Renew or cancel? Drivers
of customer renewal decisions for IT-based service contracts}, number={79}, journal={Journal
of Business Research}, publisher={Elsevier}, author={Wangenheim, Florian v and
Wünderlich, Nancy and Schumann, Jan H}, year={2017}, pages={181--188} }'
chicago: 'Wangenheim, Florian v, Nancy Wünderlich, and Jan H Schumann. “Renew or
Cancel? Drivers of Customer Renewal Decisions for IT-Based Service Contracts.”
Journal of Business Research, no. 79 (2017): 181--188.'
ieee: F. v Wangenheim, N. Wünderlich, and J. H. Schumann, “Renew or cancel? Drivers
of customer renewal decisions for IT-based service contracts,” Journal of Business
Research, no. 79, pp. 181--188, 2017.
mla: Wangenheim, Florian v, et al. “Renew or Cancel? Drivers of Customer Renewal
Decisions for IT-Based Service Contracts.” Journal of Business Research,
no. 79, Elsevier, 2017, pp. 181--188.
short: F. v Wangenheim, N. Wünderlich, J.H. Schumann, Journal of Business Research
(2017) 181--188.
date_created: 2018-10-26T10:11:34Z
date_updated: 2022-01-06T07:01:30Z
department:
- _id: '178'
- _id: '181'
issue: '79'
keyword:
- IT-based service
- Smart services
- Contract renewal
- Retention
- Customer churn
- Free trial
language:
- iso: eng
page: 181--188
publication: Journal of Business Research
publication_status: published
publisher: Elsevier
status: public
title: Renew or cancel? Drivers of customer renewal decisions for IT-based service
contracts
type: journal_article
user_id: '37741'
year: '2017'
...
---
_id: '4586'
abstract:
- lang: eng
text: 'This study examines the loan-pricing behavior of German banks for a large
variety of retail and corporate loan products. We find that a bank’s operational
efficiency is priced in bank loan rates and alters interest-setting behavior.
Specifically, we establish that a higher degree of operational efficiency leads
to lower loan markups, which makes prices more competitive and smoothes the setting
of interest rates. By employing state-of-the-art stochastic frontier efficiency
measures to capture a bank’s operational efficiency, we take a look at the bank
customers’ perspective and demonstrate the extent to which bor-rowers benefit
from cost-efficient banking. '
article_type: letter_note
author:
- first_name: Tobias
full_name: Schlueter, Tobias
last_name: Schlueter
- first_name: Ramona
full_name: Busch, Ramona
last_name: Busch
- first_name: Soenke
full_name: Sievers, Soenke
last_name: Sievers
- first_name: Thomas
full_name: Hartmann-Wendels, Thomas
last_name: Hartmann-Wendels
citation:
ama: 'Schlueter T, Busch R, Sievers S, Hartmann-Wendels T. Loan Pricing: Do Borrowers
Benefit from Cost-Efficient Banking? Credit and Capital Markets--Kredit und
Kapital. 2016;49(1):93-125. doi:10.3790/ccm.49.1.93'
apa: 'Schlueter, T., Busch, R., Sievers, S., & Hartmann-Wendels, T. (2016).
Loan Pricing: Do Borrowers Benefit from Cost-Efficient Banking? Credit and
Capital Markets--Kredit Und Kapital, 49(1), 93–125. https://doi.org/10.3790/ccm.49.1.93'
bibtex: '@article{Schlueter_Busch_Sievers_Hartmann-Wendels_2016, title={Loan Pricing:
Do Borrowers Benefit from Cost-Efficient Banking?}, volume={49}, DOI={10.3790/ccm.49.1.93},
number={1}, journal={Credit and Capital Markets--Kredit und Kapital}, author={Schlueter,
Tobias and Busch, Ramona and Sievers, Soenke and Hartmann-Wendels, Thomas}, year={2016},
pages={93–125} }'
chicago: 'Schlueter, Tobias, Ramona Busch, Soenke Sievers, and Thomas Hartmann-Wendels.
“Loan Pricing: Do Borrowers Benefit from Cost-Efficient Banking?” Credit and
Capital Markets--Kredit Und Kapital 49, no. 1 (2016): 93–125. https://doi.org/10.3790/ccm.49.1.93.'
ieee: 'T. Schlueter, R. Busch, S. Sievers, and T. Hartmann-Wendels, “Loan Pricing:
Do Borrowers Benefit from Cost-Efficient Banking?,” Credit and Capital Markets--Kredit
und Kapital, vol. 49, no. 1, pp. 93–125, 2016.'
mla: 'Schlueter, Tobias, et al. “Loan Pricing: Do Borrowers Benefit from Cost-Efficient
Banking?” Credit and Capital Markets--Kredit Und Kapital, vol. 49, no.
1, 2016, pp. 93–125, doi:10.3790/ccm.49.1.93.'
short: T. Schlueter, R. Busch, S. Sievers, T. Hartmann-Wendels, Credit and Capital
Markets--Kredit Und Kapital 49 (2016) 93–125.
date_created: 2018-10-09T09:04:17Z
date_updated: 2022-01-06T07:01:14Z
department:
- _id: '275'
doi: 10.3790/ccm.49.1.93
intvolume: ' 49'
issue: '1'
jel:
- G21
- G28
keyword:
- interest rate pass-through models
- error correction models
- bank efficiency
- cost efficiency
- stochastic frontier analysis
language:
- iso: eng
page: 93-125
publication: Credit and Capital Markets--Kredit und Kapital
publication_status: published
status: public
title: 'Loan Pricing: Do Borrowers Benefit from Cost-Efficient Banking?'
type: journal_article
user_id: '64756'
volume: 49
year: '2016'
...
---
_id: '9959'
abstract:
- lang: eng
text: Ultrasonic heavy wire bonding is a commonly used technology to conduct electrical
devices in power electronics. In order to facilitate powerful solutions combined
with an increased efficiency, involving a material change from aluminum to copper
wire as conductor material takes place in recent years. Due to the material related
properties, copper wire bonding requires significant higher bond processing parameters
such as bond force and ultrasonic power compared to aluminum which can lead to
damages or a failure of the bonded component. Therefore, a profound knowledge
of the processes prevailing during wire bonding is essential to optimize the application
of the copper wires and consequently to achieve the demands on quality and reliability.
The behavior of different natural surface oxides of aluminum and copper are assumed
to be one reason for the deviation in the required bond parameters. Accordingly,
the impact of differently pre-treated substrates surfaces on which the bonding
is applied were investigated in this study. First, all conditions investigated
(as-received, oxidefree, AlOx and the CuOx) were characterized by utilizing scanning
electron microscopy, energy dispersive X-ray spectroscopy, focused ion beam microscopy
and atomic force microscopy. In addition, hardness tests were performed as well
as perthometer measurements. Afterwards, a 500 $\mu$ m copper wire was bonded
on the generated surfaces investigated. In consideration of the roughness, shear
test of various bond times and microscopic images were evaluated. Finally, the
results were compared and discussed. Overall, the current study indicates that
an Al-oxide layer is beneficial for welding process in Cu wire bonding. On the
contrary, the Cu-oxide is detrimental and leads to a delayed welding of the joining
parts. Based on the obtained results, it can be expected that due to an ideal
set of Al-oxide layers, lower optimal bond parameters can used to reach high bond
strength with good reliability properties.
author:
- first_name: Florian
full_name: Eacock, Florian
last_name: Eacock
- first_name: Andreas
full_name: Unger, Andreas
last_name: Unger
- first_name: Paul
full_name: Eichwald, Paul
last_name: Eichwald
- first_name: Olexandr
full_name: Grydin, Olexandr
last_name: Grydin
- first_name: Florian
full_name: Hengsbach, Florian
last_name: Hengsbach
- first_name: Simon
full_name: Althoff, Simon
last_name: Althoff
- first_name: Mirko
full_name: Schaper, Mirko
last_name: Schaper
- first_name: Karsten
full_name: Guth, Karsten
last_name: Guth
citation:
ama: 'Eacock F, Unger A, Eichwald P, et al. Effect of different oxide layers on
the ultrasonic copper wire bond process. In: IEEE 66th Electronic Components
and Technology Conference. ; 2016:2111-2118. doi:10.1109/ECTC.2016.91'
apa: Eacock, F., Unger, A., Eichwald, P., Grydin, O., Hengsbach, F., Althoff, S.,
… Guth, K. (2016). Effect of different oxide layers on the ultrasonic copper wire
bond process. In IEEE 66th Electronic Components and Technology Conference
(pp. 2111–2118). https://doi.org/10.1109/ECTC.2016.91
bibtex: '@inproceedings{Eacock_Unger_Eichwald_Grydin_Hengsbach_Althoff_Schaper_Guth_2016,
title={Effect of different oxide layers on the ultrasonic copper wire bond process},
DOI={10.1109/ECTC.2016.91},
booktitle={IEEE 66th Electronic Components and Technology Conference}, author={Eacock,
Florian and Unger, Andreas and Eichwald, Paul and Grydin, Olexandr and Hengsbach,
Florian and Althoff, Simon and Schaper, Mirko and Guth, Karsten}, year={2016},
pages={2111–2118} }'
chicago: Eacock, Florian, Andreas Unger, Paul Eichwald, Olexandr Grydin, Florian
Hengsbach, Simon Althoff, Mirko Schaper, and Karsten Guth. “Effect of Different
Oxide Layers on the Ultrasonic Copper Wire Bond Process.” In IEEE 66th Electronic
Components and Technology Conference, 2111–18, 2016. https://doi.org/10.1109/ECTC.2016.91.
ieee: F. Eacock et al., “Effect of different oxide layers on the ultrasonic
copper wire bond process,” in IEEE 66th Electronic Components and Technology
Conference, 2016, pp. 2111–2118.
mla: Eacock, Florian, et al. “Effect of Different Oxide Layers on the Ultrasonic
Copper Wire Bond Process.” IEEE 66th Electronic Components and Technology Conference,
2016, pp. 2111–18, doi:10.1109/ECTC.2016.91.
short: 'F. Eacock, A. Unger, P. Eichwald, O. Grydin, F. Hengsbach, S. Althoff, M.
Schaper, K. Guth, in: IEEE 66th Electronic Components and Technology Conference,
2016, pp. 2111–2118.'
date_created: 2019-05-27T09:00:50Z
date_updated: 2019-09-16T10:38:59Z
department:
- _id: '151'
doi: 10.1109/ECTC.2016.91
keyword:
- Ultrasonic copper wire bonding
- Al-oxide
- Cuoxide
- oxide-free
- roughness
- morphology
language:
- iso: eng
page: 2111-2118
publication: IEEE 66th Electronic Components and Technology Conference
quality_controlled: '1'
status: public
title: Effect of different oxide layers on the ultrasonic copper wire bond process
type: conference
user_id: '55222'
year: '2016'
...
---
_id: '4035'
abstract:
- lang: eng
text: We examine whether the mandated introduction of International Financial Reporting
Standards (IFRS) is associated with the propensity to access the public rather
than private debt market and the cost of debt. We use a global sample of public
bonds and private loans and find that mandatory IFRS adopters are more likely,
post-IFRS, to issue bonds than to borrow privately. We also find that mandatory
IFRS adopters pay lower bond yield spreads, but not lower loan spreads, after
the mandate. These findings are consistent with debt providers responding positively
to financial reporting of higher quality and comparability, but only when there
is a greater reliance on publicly available financial statements than private
communication. Lastly, we document that the observed debt market benefits are
concentrated in countries with larger differences between domestic GAAP and IFRS
and are present even for EU countries that did not experience concurrent financial
reporting enforcement or other institutional reforms. Overall, our study documents
positive economic consequences around the mandated IFRS adoption for corporate
debt financing and, in particular, for bond financing.
author:
- first_name: Annita
full_name: Florou, Annita
last_name: Florou
- first_name: Urska
full_name: Kosi, Urska
id: '54068'
last_name: Kosi
citation:
ama: Florou A, Kosi U. Does mandatory IFRS adoption facilitate debt financing? Review
of Accounting Studies. 2015;20(4):1407-1456. doi:10.1007/s11142
apa: Florou, A., & Kosi, U. (2015). Does mandatory IFRS adoption facilitate
debt financing? Review of Accounting Studies, 20(4), 1407–1456.
https://doi.org/10.1007/s11142
bibtex: '@article{Florou_Kosi_2015, title={Does mandatory IFRS adoption facilitate
debt financing?}, volume={20}, DOI={10.1007/s11142},
number={4}, journal={Review of Accounting Studies}, author={Florou, Annita and
Kosi, Urska}, year={2015}, pages={1407–1456} }'
chicago: 'Florou, Annita, and Urska Kosi. “Does Mandatory IFRS Adoption Facilitate
Debt Financing?” Review of Accounting Studies 20, no. 4 (2015): 1407–56.
https://doi.org/10.1007/s11142.'
ieee: 'A. Florou and U. Kosi, “Does mandatory IFRS adoption facilitate debt financing?,”
Review of Accounting Studies, vol. 20, no. 4, pp. 1407–1456, 2015, doi:
10.1007/s11142.'
mla: Florou, Annita, and Urska Kosi. “Does Mandatory IFRS Adoption Facilitate Debt
Financing?” Review of Accounting Studies, vol. 20, no. 4, 2015, pp. 1407–56,
doi:10.1007/s11142.
short: A. Florou, U. Kosi, Review of Accounting Studies 20 (2015) 1407–1456.
date_created: 2018-08-22T07:47:41Z
date_updated: 2023-01-24T15:32:37Z
department:
- _id: '551'
- _id: '635'
- _id: '186'
doi: 10.1007/s11142
extern: '1'
intvolume: ' 20'
issue: '4'
jel:
- G15
- K22
- M41
- M48
keyword:
- Accounting regulation
- IFRS
- Accounting quality
- Public and private debt markets
- Cost of debt
language:
- iso: eng
page: 1407-1456
publication: Review of Accounting Studies
publication_identifier:
eissn:
- 1573-7136
publication_status: published
status: public
title: Does mandatory IFRS adoption facilitate debt financing?
type: journal_article
user_id: '54068'
volume: 20
year: '2015'
...
---
_id: '9878'
abstract:
- lang: eng
text: (K,Na)NbO3 ceramics have attracted much attention as lead-free piezoelectric
materials with high piezoelectric properties. High-quality (K,Na)NbO3 ceramics
can be sintered using KNbO3 and NaNbO3 powders synthesized by a hydrothermal method.
In this study, to enhance the quality factor of the ceramics, high-power ultrasonic
irradiation was employed during the hydrothermal method, which led to a reduction
in the particle size of the resultant powders.
author:
- first_name: G.
full_name: Isobe, G.
last_name: Isobe
- first_name: Takafumi
full_name: Maeda, Takafumi
last_name: Maeda
- first_name: Peter
full_name: Bornmann, Peter
last_name: Bornmann
- first_name: Tobias
full_name: Hemsel, Tobias
id: '210'
last_name: Hemsel
- first_name: Takeshi
full_name: Morita, Takeshi
last_name: Morita
citation:
ama: Isobe G, Maeda T, Bornmann P, Hemsel T, Morita T. Synthesis of lead-free piezoelectric
powders by ultrasonic-assisted hydrothermal method and properties of sintered
(K0.48Na0.52)NBO3 ceramics. Ultrasonics, Ferroelectrics, and Frequency Control,
IEEE Transactions on. 2014;61(2):225-230. doi:10.1109/TUFFC.2014.6722608
apa: Isobe, G., Maeda, T., Bornmann, P., Hemsel, T., & Morita, T. (2014). Synthesis
of lead-free piezoelectric powders by ultrasonic-assisted hydrothermal method
and properties of sintered (K0.48Na0.52)NBO3 ceramics. Ultrasonics, Ferroelectrics,
and Frequency Control, IEEE Transactions On, 61(2), 225–230. https://doi.org/10.1109/TUFFC.2014.6722608
bibtex: '@article{Isobe_Maeda_Bornmann_Hemsel_Morita_2014, title={Synthesis of lead-free
piezoelectric powders by ultrasonic-assisted hydrothermal method and properties
of sintered (K0.48Na0.52)NBO3 ceramics}, volume={61}, DOI={10.1109/TUFFC.2014.6722608},
number={2}, journal={Ultrasonics, Ferroelectrics, and Frequency Control, IEEE
Transactions on}, author={Isobe, G. and Maeda, Takafumi and Bornmann, Peter and
Hemsel, Tobias and Morita, Takeshi}, year={2014}, pages={225–230} }'
chicago: 'Isobe, G., Takafumi Maeda, Peter Bornmann, Tobias Hemsel, and Takeshi
Morita. “Synthesis of Lead-Free Piezoelectric Powders by Ultrasonic-Assisted Hydrothermal
Method and Properties of Sintered (K0.48Na0.52)NBO3 Ceramics.” Ultrasonics,
Ferroelectrics, and Frequency Control, IEEE Transactions On 61, no. 2 (2014):
225–30. https://doi.org/10.1109/TUFFC.2014.6722608.'
ieee: G. Isobe, T. Maeda, P. Bornmann, T. Hemsel, and T. Morita, “Synthesis of lead-free
piezoelectric powders by ultrasonic-assisted hydrothermal method and properties
of sintered (K0.48Na0.52)NBO3 ceramics,” Ultrasonics, Ferroelectrics, and Frequency
Control, IEEE Transactions on, vol. 61, no. 2, pp. 225–230, 2014.
mla: Isobe, G., et al. “Synthesis of Lead-Free Piezoelectric Powders by Ultrasonic-Assisted
Hydrothermal Method and Properties of Sintered (K0.48Na0.52)NBO3 Ceramics.” Ultrasonics,
Ferroelectrics, and Frequency Control, IEEE Transactions On, vol. 61, no.
2, 2014, pp. 225–30, doi:10.1109/TUFFC.2014.6722608.
short: G. Isobe, T. Maeda, P. Bornmann, T. Hemsel, T. Morita, Ultrasonics, Ferroelectrics,
and Frequency Control, IEEE Transactions On 61 (2014) 225–230.
date_created: 2019-05-20T13:10:14Z
date_updated: 2019-09-16T10:53:17Z
department:
- _id: '151'
doi: 10.1109/TUFFC.2014.6722608
intvolume: ' 61'
issue: '2'
keyword:
- Q-factor
- ceramics
- crystal growth from solution
- particle size
- piezoelectric materials
- potassium compounds
- powders
- sintering
- sodium compounds
- ultrasonic effects
- (K0.48Na0.52)NbO3
- KNbO3 powders
- NaNbO3 powders
- high-power ultrasonic irradiation
- lead-free piezoelectric materials
- lead-free piezoelectric powders
- particle size reduction
- piezoelectric properties
- quality factor
- sintered (K0.48Na0.52)NbO3 ceramics
- sintering
- ultrasonic-assisted hydrothermal method
- Acoustics
- Ceramics
- Lead
- Piezoelectric materials
- Powders
- Radiation effects
- Transducers
language:
- iso: eng
page: 225-230
publication: Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions
on
publication_identifier:
issn:
- 0885-3010
quality_controlled: '1'
status: public
title: Synthesis of lead-free piezoelectric powders by ultrasonic-assisted hydrothermal
method and properties of sintered (K0.48Na0.52)NBO3 ceramics
type: journal_article
user_id: '55222'
volume: 61
year: '2014'
...
---
_id: '20863'
abstract:
- lang: eng
text: This article examines and extends research on the relation between the capital
asset pricing model market beta, accounting risk measures and macroeconomic risk
factors. We employ a beta decomposition approach that nests competing models with
different business risk proxies and allows to frame cross-model comparison. Because
model tests require estimated independent variables resulting in measurement error,
we empirically estimate three comparable model specifications with instrumental
variable estimators and for the first time provide thorough instrument diagnostics
in this setting. Correcting for the heretofore neglected weak instruments problem
we find that growth risk (i.e., the risk of firm sales variations that are inconsistent
with the market wide trends), is the business risk that explains cross-sectional
variations in market beta best.
article_type: original
author:
- first_name: Tobias
full_name: Schlueter, Tobias
last_name: Schlueter
- first_name: Sönke
full_name: Sievers, Sönke
id: '46447'
last_name: Sievers
citation:
ama: 'Schlueter T, Sievers S. Determinants of market beta: the impacts of firm-specific
accounting figures and market conditions. Review of Quantitative Finance and
Accounting (VHB-JOURQUAL 3 Ranking B). 2013;(3):535-570. doi:10.1007/s11156-013-0352-1'
apa: 'Schlueter, T., & Sievers, S. (2013). Determinants of market beta: the
impacts of firm-specific accounting figures and market conditions. Review of
Quantitative Finance and Accounting (VHB-JOURQUAL 3 Ranking B), (3), 535–570.
https://doi.org/10.1007/s11156-013-0352-1'
bibtex: '@article{Schlueter_Sievers_2013, title={Determinants of market beta: the
impacts of firm-specific accounting figures and market conditions}, DOI={10.1007/s11156-013-0352-1},
number={3}, journal={Review of Quantitative Finance and Accounting (VHB-JOURQUAL
3 Ranking B)}, author={Schlueter, Tobias and Sievers, Sönke}, year={2013}, pages={535–570}
}'
chicago: 'Schlueter, Tobias, and Sönke Sievers. “Determinants of Market Beta: The
Impacts of Firm-Specific Accounting Figures and Market Conditions.” Review
of Quantitative Finance and Accounting (VHB-JOURQUAL 3 Ranking B), no. 3 (2013):
535–70. https://doi.org/10.1007/s11156-013-0352-1.'
ieee: 'T. Schlueter and S. Sievers, “Determinants of market beta: the impacts of
firm-specific accounting figures and market conditions,” Review of Quantitative
Finance and Accounting (VHB-JOURQUAL 3 Ranking B), no. 3, pp. 535–570, 2013.'
mla: 'Schlueter, Tobias, and Sönke Sievers. “Determinants of Market Beta: The Impacts
of Firm-Specific Accounting Figures and Market Conditions.” Review of Quantitative
Finance and Accounting (VHB-JOURQUAL 3 Ranking B), no. 3, 2013, pp. 535–70,
doi:10.1007/s11156-013-0352-1.'
short: T. Schlueter, S. Sievers, Review of Quantitative Finance and Accounting (VHB-JOURQUAL
3 Ranking B) (2013) 535–570.
date_created: 2021-01-05T09:28:36Z
date_updated: 2022-01-06T06:54:41Z
department:
- _id: '275'
doi: 10.1007/s11156-013-0352-1
extern: '1'
issue: '3'
jel:
- C36
- G11
- G12
keyword:
- CAPM
- Cost of capital
- Accounting beta
- Intrinsic business risk
- Growth risk
- Instrumental variables
language:
- iso: eng
main_file_link:
- url: https://link.springer.com/article/10.1007/s11156-013-0352-1
page: 535-570
publication: Review of Quantitative Finance and Accounting (VHB-JOURQUAL 3 Ranking
B)
publication_identifier:
issn:
- 0924-865X
- 1573-7179
publication_status: published
quality_controlled: '1'
status: public
title: 'Determinants of market beta: the impacts of firm-specific accounting figures
and market conditions'
type: journal_article
user_id: '46447'
year: '2013'
...
---
_id: '5108'
abstract:
- lang: eng
text: 'This study integrates the government in the context of company valuation.
Our framework allows to analyze and to quantify the risk-sharing effects and conflicts
of interest between the government and the shareholders when firms follow different
financial policies. We provide novel evidence that firms with fixed future levels
of debt might invest more than socially desirable. Economically, this happens
if the gain in tax-shields is big enough to outweigh the loss in the unlevered
firm value. Our findings have implications for the practice of investment subsidy
programs provided by the government to avoid fostering investments beyond the
socially optimal level. '
article_type: original
author:
- first_name: Daniel
full_name: Kreutzmann, Daniel
last_name: Kreutzmann
- first_name: Sönke
full_name: Sievers, Sönke
id: '46447'
last_name: Sievers
- first_name: Christian
full_name: Mueller, Christian
last_name: Mueller
citation:
ama: Kreutzmann D, Sievers S, Mueller C. Investment distortions and the value of
the government’s tax claim. Applied Financial Economics (VHB-JOURQUAL 3 Ranking
C). 2013;23(11):977-989. doi:10.1080/09603107.2013.786161
apa: Kreutzmann, D., Sievers, S., & Mueller, C. (2013). Investment distortions
and the value of the government’s tax claim. Applied Financial Economics (VHB-JOURQUAL
3 Ranking C), 23(11), 977–989. https://doi.org/10.1080/09603107.2013.786161
bibtex: '@article{Kreutzmann_Sievers_Mueller_2013, title={Investment distortions
and the value of the government’s tax claim}, volume={23}, DOI={10.1080/09603107.2013.786161},
number={11}, journal={Applied Financial Economics (VHB-JOURQUAL 3 Ranking C)},
publisher={Taylor \& Francis}, author={Kreutzmann, Daniel and Sievers, Sönke
and Mueller, Christian}, year={2013}, pages={977–989} }'
chicago: 'Kreutzmann, Daniel, Sönke Sievers, and Christian Mueller. “Investment
Distortions and the Value of the Government’s Tax Claim.” Applied Financial
Economics (VHB-JOURQUAL 3 Ranking C) 23, no. 11 (2013): 977–89. https://doi.org/10.1080/09603107.2013.786161.'
ieee: D. Kreutzmann, S. Sievers, and C. Mueller, “Investment distortions and the
value of the government’s tax claim,” Applied Financial Economics (VHB-JOURQUAL
3 Ranking C), vol. 23, no. 11, pp. 977–989, 2013.
mla: Kreutzmann, Daniel, et al. “Investment Distortions and the Value of the Government’s
Tax Claim.” Applied Financial Economics (VHB-JOURQUAL 3 Ranking C), vol.
23, no. 11, Taylor \& Francis, 2013, pp. 977–89, doi:10.1080/09603107.2013.786161.
short: D. Kreutzmann, S. Sievers, C. Mueller, Applied Financial Economics (VHB-JOURQUAL
3 Ranking C) 23 (2013) 977–989.
date_created: 2018-10-31T07:50:58Z
date_updated: 2022-01-06T07:01:38Z
department:
- _id: '275'
doi: 10.1080/09603107.2013.786161
extern: '1'
intvolume: ' 23'
issue: '11'
jel:
- G31
- G32
- H21
- H25
keyword:
- corporate tax claim
- company valuation
- optimal investment
- cost of capital
language:
- iso: eng
main_file_link:
- url: https://www.tandfonline.com/doi/full/10.1080/09603107.2013.786161#.VE5YmBZwmAd
page: 977-989
publication: Applied Financial Economics (VHB-JOURQUAL 3 Ranking C)
publication_status: published
publisher: Taylor \& Francis
status: public
title: Investment distortions and the value of the government's tax claim
type: journal_article
user_id: '46447'
volume: 23
year: '2013'
...
---
_id: '37109'
abstract:
- lang: eng
text: This study examines the effect of audit on private firms’ cost of debt. We
use a sample of 1,949 small private firms operating in the period 2006-2010 with
optional financial statement audit. High quality data allows us to construct a
more precise interest rate measure than existing studies employ. After controlling
for obvious sources of demand for voluntary audits (ownership complexity, subsidiary
status, bank relations), we find a robust central result that voluntary audits
increase rather than decrease the cost of debt financing, contrary to several
existing studies. This finding indicates that voluntary audits are generally treated
as “adopting a label” and penalised by creditors, regardless of the perceived
auditor quality as a result of the lemon problem in the audit market. Even Big-4
audits increase the cost of debt, likely as a result due to the lemon problem
in the audit market, although the increase is smaller than for non-Big-4 audits.
The results are sensitive to the estimation method used (OLS, Heckman’s two-step,
PSM) and (sub-)sample selection. We show that disregarding the underlying assumptions
of these estimation methods may lead to incorrect inferences. Additional analyses
show that audited firms’ reported earnings are less informative about future operating
performance than earnings of their unaudited counterparts. Our results also indicate
that results are sensitive to cost of debt definition and this might have affected
the results reported in the existing literature.
author:
- first_name: Urska
full_name: Kosi, Urska
id: '54068'
last_name: Kosi
- first_name: Jerney
full_name: Koren, Jerney
last_name: Koren
- first_name: Aljosa
full_name: Valentincic, Aljosa
last_name: Valentincic
citation:
ama: 'Kosi U, Koren J, Valentincic A. Does Financial Statement Audit Reduce the
Cost of Debt of Private Firms? In: ; 2013.'
apa: Kosi, U., Koren, J., & Valentincic, A. (2013). Does Financial Statement
Audit Reduce the Cost of Debt of Private Firms? 36th Annual Congress of European
Accounting Association, Paris, France.
bibtex: '@inproceedings{Kosi_Koren_Valentincic_2013, title={Does Financial Statement
Audit Reduce the Cost of Debt of Private Firms?}, author={Kosi, Urska and Koren,
Jerney and Valentincic, Aljosa}, year={2013} }'
chicago: Kosi, Urska, Jerney Koren, and Aljosa Valentincic. “Does Financial Statement
Audit Reduce the Cost of Debt of Private Firms?,” 2013.
ieee: U. Kosi, J. Koren, and A. Valentincic, “Does Financial Statement Audit Reduce
the Cost of Debt of Private Firms?,” presented at the 36th Annual Congress of
European Accounting Association, Paris, France, 2013.
mla: Kosi, Urska, et al. Does Financial Statement Audit Reduce the Cost of Debt
of Private Firms? 2013.
short: 'U. Kosi, J. Koren, A. Valentincic, in: 2013.'
conference:
end_date: 2013-05-05
location: Paris, France
name: 36th Annual Congress of European Accounting Association
start_date: 2013-05-02
date_created: 2023-01-17T13:25:30Z
date_updated: 2023-01-17T13:51:24Z
department:
- _id: '635'
- _id: '186'
- _id: '551'
extern: '1'
keyword:
- private firms
- voluntary audit
- cost of debt
- self-selection bias
- lemon problem
language:
- iso: eng
main_file_link:
- url: https://papers.ssrn.com/sol3/papers.cfm?abstract_id=2373987
status: public
title: Does Financial Statement Audit Reduce the Cost of Debt of Private Firms?
type: conference
user_id: '88603'
year: '2013'
...
---
_id: '9788'
abstract:
- lang: eng
text: 'A hydrothermal method utilizes a crystallization process in the solution
so that the pure and high-quality powders can be realized. Sintering from the
hydrothermal KNbO3 and NaNbO3 powders, a high-dense lead-free piezoelectric (K,Na)NbO3
ceramics could be obtained (density: 98.8\%). Concerning about the g33 constant,
high value as large as commercial PZT ceramics was measured. Therefore, the hydrothermal
(K,Na)NbO3 ceramics is usable for the sensors and the energy harvesting devices.
To demonstrate the (K,Na)NbO3 ceramics, a hydrophone sensor was fabricated and
evaluated.'
author:
- first_name: Takafumi
full_name: Maeda, Takafumi
last_name: Maeda
- first_name: Peter
full_name: Bornmann, Peter
last_name: Bornmann
- first_name: Tobias
full_name: Hemsel, Tobias
id: '210'
last_name: Hemsel
- first_name: Takeshi
full_name: Morita, Takeshi
last_name: Morita
citation:
ama: 'Maeda T, Bornmann P, Hemsel T, Morita T. Piezoelectric applications of hydrothermal
lead-free (K0.48Na0.52)NbO3 ceramics. In: Ultrasonics Symposium (IUS), 2012
IEEE International. ; 2012:194-195. doi:10.1109/ULTSYM.2012.0048'
apa: Maeda, T., Bornmann, P., Hemsel, T., & Morita, T. (2012). Piezoelectric
applications of hydrothermal lead-free (K0.48Na0.52)NbO3 ceramics. In Ultrasonics
Symposium (IUS), 2012 IEEE International (pp. 194–195). https://doi.org/10.1109/ULTSYM.2012.0048
bibtex: '@inproceedings{Maeda_Bornmann_Hemsel_Morita_2012, title={Piezoelectric
applications of hydrothermal lead-free (K0.48Na0.52)NbO3 ceramics}, DOI={10.1109/ULTSYM.2012.0048},
booktitle={Ultrasonics Symposium (IUS), 2012 IEEE International}, author={Maeda,
Takafumi and Bornmann, Peter and Hemsel, Tobias and Morita, Takeshi}, year={2012},
pages={194–195} }'
chicago: Maeda, Takafumi, Peter Bornmann, Tobias Hemsel, and Takeshi Morita. “Piezoelectric
Applications of Hydrothermal Lead-Free (K0.48Na0.52)NbO3 Ceramics.” In Ultrasonics
Symposium (IUS), 2012 IEEE International, 194–95, 2012. https://doi.org/10.1109/ULTSYM.2012.0048.
ieee: T. Maeda, P. Bornmann, T. Hemsel, and T. Morita, “Piezoelectric applications
of hydrothermal lead-free (K0.48Na0.52)NbO3 ceramics,” in Ultrasonics Symposium
(IUS), 2012 IEEE International, 2012, pp. 194–195.
mla: Maeda, Takafumi, et al. “Piezoelectric Applications of Hydrothermal Lead-Free
(K0.48Na0.52)NbO3 Ceramics.” Ultrasonics Symposium (IUS), 2012 IEEE International,
2012, pp. 194–95, doi:10.1109/ULTSYM.2012.0048.
short: 'T. Maeda, P. Bornmann, T. Hemsel, T. Morita, in: Ultrasonics Symposium (IUS),
2012 IEEE International, 2012, pp. 194–195.'
date_created: 2019-05-13T13:28:05Z
date_updated: 2022-01-06T07:04:20Z
department:
- _id: '151'
doi: 10.1109/ULTSYM.2012.0048
keyword:
- crystallisation
- hydrophones
- piezoceramics
- potassium compounds
- powder technology
- powders
- sensors
- sintering
- sodium compounds
- (K0.48Na0.52)NbO3
- KNbO3 powder
- NaNbO3 powder
- crystallization
- energy harvesting devices
- g33 constant
- hydrophone sensor
- hydrothermal lead-free (K0.48Na0.52)NbO3 ceramics
- hydrothermal method
- piezoelectric applications
- sintering
- Materials
- Transducers
language:
- iso: eng
page: 194-195
publication: Ultrasonics Symposium (IUS), 2012 IEEE International
publication_identifier:
issn:
- 1948-5719
quality_controlled: '1'
status: public
title: Piezoelectric applications of hydrothermal lead-free (K0.48Na0.52)NbO3 ceramics
type: conference
user_id: '55222'
year: '2012'
...
---
_id: '36994'
abstract:
- lang: eng
text: This paper proposes a quality driven, simulation based approach to functional
design verification, which applies mainly to IP-level HDL designs with well specified
test instruction format and is evaluated on a soft microprocessor core MB-LITE
[5]. The approach utilizes mutation analysis as the quality metric to steer an
automated simulation data generation process. It leads to a simulation flow with
two phases towards an enhanced mutation analysis result. First in a random simulation
phase, an in-loop heuristics is deployed and adjusts dynamically the test probability
distribution so as to improve the coverage efficiency. Next, for each remaining
hard-to-kill mutant, a search heuristics on test input space is developed to iteratively
locate a target test, using a specific objective cost function for the goal of
killing HDL mutant. The effectiveness of this integrated two-phase simulation
flow is demonstrated by the results with the MB-LITE microprocessor IP.
author:
- first_name: 'Tao '
full_name: 'Xie, Tao '
last_name: Xie
- first_name: Wolfgang
full_name: Müller, Wolfgang
id: '16243'
last_name: Müller
- first_name: Florian
full_name: Letombe, Florian
last_name: Letombe
citation:
ama: 'Xie T, Müller W, Letombe F. Mutation-Analysis Driven Functional Verification
of a Soft Microprocessor. In: Proceedings of SOCC2012. IEEE; 2012. doi:10.1109/SOCC.2012.6398362'
apa: Xie, T., Müller, W., & Letombe, F. (2012). Mutation-Analysis Driven Functional
Verification of a Soft Microprocessor. Proceedings of SOCC2012. https://doi.org/10.1109/SOCC.2012.6398362
bibtex: '@inproceedings{Xie_Müller_Letombe_2012, place={ Niagara Falls, NY, USA
}, title={Mutation-Analysis Driven Functional Verification of a Soft Microprocessor},
DOI={10.1109/SOCC.2012.6398362},
booktitle={Proceedings of SOCC2012}, publisher={IEEE}, author={Xie, Tao and Müller,
Wolfgang and Letombe, Florian}, year={2012} }'
chicago: 'Xie, Tao , Wolfgang Müller, and Florian Letombe. “Mutation-Analysis Driven
Functional Verification of a Soft Microprocessor.” In Proceedings of SOCC2012. Niagara
Falls, NY, USA : IEEE, 2012. https://doi.org/10.1109/SOCC.2012.6398362.'
ieee: 'T. Xie, W. Müller, and F. Letombe, “Mutation-Analysis Driven Functional Verification
of a Soft Microprocessor,” 2012, doi: 10.1109/SOCC.2012.6398362.'
mla: Xie, Tao, et al. “Mutation-Analysis Driven Functional Verification of a Soft
Microprocessor.” Proceedings of SOCC2012, IEEE, 2012, doi:10.1109/SOCC.2012.6398362.
short: 'T. Xie, W. Müller, F. Letombe, in: Proceedings of SOCC2012, IEEE, Niagara
Falls, NY, USA , 2012.'
date_created: 2023-01-17T08:46:14Z
date_updated: 2023-01-17T08:46:29Z
department:
- _id: '672'
doi: 10.1109/SOCC.2012.6398362
keyword:
- Analytical models
- Hardware design languages
- Microprocessors
- Cost function
- Data models
- Search problems
- IP networks
language:
- iso: eng
place: ' Niagara Falls, NY, USA '
publication: Proceedings of SOCC2012
publication_identifier:
eisbn:
- 978-1-4673-1295-0
publisher: IEEE
status: public
title: Mutation-Analysis Driven Functional Verification of a Soft Microprocessor
type: conference
user_id: '5786'
year: '2012'
...