---
_id: '9754'
abstract:
- lang: eng
text: A model based design approach for improved piezoelectric inertia motors is
presented. Three velocityoptimized movement patterns for the driving body have
been derived. The influence of the motor parameters and the process of designing
an application specific motor with maximum velocity are shown. A simple dynamic
model of the piezoelectric actuator is used to calculate the voltage signal for
achieving the desired movement pattern. Observed distortions of the optimum pattern,
their influence on the motion of the driven body and different methods to reduce
them are discussed.
author:
- first_name: Matthias
full_name: Hunstig, Matthias
last_name: Hunstig
- 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: 'Hunstig M, Hemsel T, Sextro W. Improving the Performance of Piezoelectric
Inertia Motors. In: ACTUATOR 2010 Conference Proceedings. ; 2010:657-661.'
apa: Hunstig, M., Hemsel, T., & Sextro, W. (2010). Improving the Performance
of Piezoelectric Inertia Motors. In ACTUATOR 2010 Conference Proceedings
(pp. 657–661).
bibtex: '@inproceedings{Hunstig_Hemsel_Sextro_2010, title={Improving the Performance
of Piezoelectric Inertia Motors}, booktitle={ACTUATOR 2010 Conference Proceedings},
author={Hunstig, Matthias and Hemsel, Tobias and Sextro, Walter}, year={2010},
pages={657–661} }'
chicago: Hunstig, Matthias, Tobias Hemsel, and Walter Sextro. “Improving the Performance
of Piezoelectric Inertia Motors.” In ACTUATOR 2010 Conference Proceedings,
657–61, 2010.
ieee: M. Hunstig, T. Hemsel, and W. Sextro, “Improving the Performance of Piezoelectric
Inertia Motors,” in ACTUATOR 2010 Conference Proceedings, 2010, pp. 657–661.
mla: Hunstig, Matthias, et al. “Improving the Performance of Piezoelectric Inertia
Motors.” ACTUATOR 2010 Conference Proceedings, 2010, pp. 657–61.
short: 'M. Hunstig, T. Hemsel, W. Sextro, in: ACTUATOR 2010 Conference Proceedings,
2010, pp. 657–661.'
date_created: 2019-05-13T10:10:31Z
date_updated: 2022-01-06T07:04:19Z
department:
- _id: '151'
language:
- iso: eng
page: 657-661
publication: ACTUATOR 2010 Conference Proceedings
publication_identifier:
issn:
- 0924-4247
quality_controlled: '1'
status: public
title: Improving the Performance of Piezoelectric Inertia Motors
type: conference
user_id: '55222'
year: '2010'
...
---
_id: '9755'
author:
- first_name: Verena
full_name: Kraft , Verena
last_name: 'Kraft '
- first_name: C.
full_name: Bauch, C.
last_name: Bauch
- first_name: M.
full_name: Nückel, M.
last_name: Nückel
- first_name: Tobias
full_name: Hemsel, Tobias
id: '210'
last_name: Hemsel
citation:
ama: 'Kraft V, Bauch C, Nückel M, Hemsel T. Konzeption und Aufbau eines Langzeitforschungsstandes
zur lichttechnischen Charakterisierung von organischen Leuchtdioden (OLEDs). In:
19. Gemeinschaftstagung LICHT 2010. Wien, Österreich; 2010.'
apa: Kraft , V., Bauch, C., Nückel, M., & Hemsel, T. (2010). Konzeption und
Aufbau eines Langzeitforschungsstandes zur lichttechnischen Charakterisierung
von organischen Leuchtdioden (OLEDs). In 19. Gemeinschaftstagung LICHT 2010.
Wien, Österreich.
bibtex: '@inproceedings{Kraft _Bauch_Nückel_Hemsel_2010, place={Wien, Österreich},
title={Konzeption und Aufbau eines Langzeitforschungsstandes zur lichttechnischen
Charakterisierung von organischen Leuchtdioden (OLEDs)}, booktitle={19. Gemeinschaftstagung
LICHT 2010}, author={Kraft , Verena and Bauch, C. and Nückel, M. and Hemsel, Tobias},
year={2010} }'
chicago: Kraft , Verena, C. Bauch, M. Nückel, and Tobias Hemsel. “Konzeption Und
Aufbau Eines Langzeitforschungsstandes Zur Lichttechnischen Charakterisierung
von Organischen Leuchtdioden (OLEDs).” In 19. Gemeinschaftstagung LICHT 2010.
Wien, Österreich, 2010.
ieee: V. Kraft , C. Bauch, M. Nückel, and T. Hemsel, “Konzeption und Aufbau eines
Langzeitforschungsstandes zur lichttechnischen Charakterisierung von organischen
Leuchtdioden (OLEDs),” in 19. Gemeinschaftstagung LICHT 2010, 2010.
mla: Kraft , Verena, et al. “Konzeption Und Aufbau Eines Langzeitforschungsstandes
Zur Lichttechnischen Charakterisierung von Organischen Leuchtdioden (OLEDs).”
19. Gemeinschaftstagung LICHT 2010, 2010.
short: 'V. Kraft , C. Bauch, M. Nückel, T. Hemsel, in: 19. Gemeinschaftstagung LICHT
2010, Wien, Österreich, 2010.'
date_created: 2019-05-13T10:11:42Z
date_updated: 2022-01-06T07:04:19Z
department:
- _id: '151'
language:
- iso: eng
place: Wien, Österreich
popular_science: '1'
publication: 19. Gemeinschaftstagung LICHT 2010
status: public
title: Konzeption und Aufbau eines Langzeitforschungsstandes zur lichttechnischen
Charakterisierung von organischen Leuchtdioden (OLEDs)
type: conference
user_id: '55222'
year: '2010'
...
---
_id: '9756'
abstract:
- lang: eng
text: Dieser Beitrag fasst die bekannten analytischen Berechnungsmethoden für piezoelektrische
Ultraschallverbundschwinger zusammen und gibt anhand typischer Beispiele Anleitungen
zur Lösung theoretischer und technischer Fragen bei deren Entwicklung. Zunächst
werden die passiven, in der Regel metallischen Komponenten von Verbundschwingern
als Stab- oder Plattensysteme mit homogen verteilten Feder-, Masse und Dämpfungseigenschaften
beschrieben. Hier breitet sich die Schwingungsenergie in Form stehender und fortschreitender
Wellen zum akustischen Verbraucher hin aus. Es folgt eine gleichwertige und schaltungstreue
Darstellung durch elektrische oder mechanische Vierpole, die für den Entwicklungsingenieur
leichter zu handhaben sind und in Netzwerken direkt mit Masons Ersatzschaltung
des piezoelektrischen Wandlers gekoppelt werden können. Danach werden die wichtigsten,
messtechnisch zugänglichen Parameter anhand eines in Resonanznähe zulässigen Ersatzmodells
mit konzentrierten elektrischen bzw. mechanischen Komponenten definiert. Als Schwerpunkt
wird anschließend deren analytische Berechnung und messtechnische Verifizierung
an typischen Beispielen demonstriert. Es folgen wichtige technische Informationen
über Frequenzkorrekturen, Schallgeschwindigkeitsdispersion, Leistungs- und Belastbarkeitsgrenzen
der Komponenten und andere wertvolle praktische Hinweise.
author:
- first_name: Ernst-Günter
full_name: Lierke, Ernst-Günter
last_name: Lierke
- first_name: Walter
full_name: Littmann, Walter
last_name: Littmann
- first_name: Tobias
full_name: Hemsel, Tobias
id: '210'
last_name: Hemsel
citation:
ama: Lierke E-G, Littmann W, Hemsel T. Zur Theorie der piezoelektrischen Ultraschallverbundschwinger
mit praktischen Schlussfolgerungen für den Entwicklungsingenieur. Veröffentlichung
der Universität Paderborn. 2010.
apa: Lierke, E.-G., Littmann, W., & Hemsel, T. (2010). Zur Theorie der piezoelektrischen
Ultraschallverbundschwinger mit praktischen Schlussfolgerungen für den Entwicklungsingenieur.
Veröffentlichung Der Universität Paderborn.
bibtex: '@article{Lierke_Littmann_Hemsel_2010, title={Zur Theorie der piezoelektrischen
Ultraschallverbundschwinger mit praktischen Schlussfolgerungen für den Entwicklungsingenieur},
journal={Veröffentlichung der Universität Paderborn}, author={Lierke, Ernst-Günter
and Littmann, Walter and Hemsel, Tobias}, year={2010} }'
chicago: Lierke, Ernst-Günter, Walter Littmann, and Tobias Hemsel. “Zur Theorie
Der Piezoelektrischen Ultraschallverbundschwinger Mit Praktischen Schlussfolgerungen
Für Den Entwicklungsingenieur.” Veröffentlichung Der Universität Paderborn,
2010.
ieee: E.-G. Lierke, W. Littmann, and T. Hemsel, “Zur Theorie der piezoelektrischen
Ultraschallverbundschwinger mit praktischen Schlussfolgerungen für den Entwicklungsingenieur,”
Veröffentlichung der Universität Paderborn, 2010.
mla: Lierke, Ernst-Günter, et al. “Zur Theorie Der Piezoelektrischen Ultraschallverbundschwinger
Mit Praktischen Schlussfolgerungen Für Den Entwicklungsingenieur.” Veröffentlichung
Der Universität Paderborn, 2010.
short: E.-G. Lierke, W. Littmann, T. Hemsel, Veröffentlichung Der Universität Paderborn
(2010).
date_created: 2019-05-13T10:14:21Z
date_updated: 2022-01-06T07:04:19Z
department:
- _id: '151'
language:
- iso: eng
publication: Veröffentlichung der Universität Paderborn
publication_identifier:
issn:
- 1948-5719
status: public
title: Zur Theorie der piezoelektrischen Ultraschallverbundschwinger mit praktischen
Schlussfolgerungen für den Entwicklungsingenieur
type: journal_article
user_id: '55222'
year: '2010'
...
---
_id: '9757'
author:
- first_name: Raimundas
full_name: Lucinskis, Raimundas
last_name: Lucinskis
- first_name: Dalius
full_name: Mazeika, Dalius
last_name: Mazeika
- first_name: Tobias
full_name: Hemsel, Tobias
id: '210'
last_name: Hemsel
- first_name: Ramutis
full_name: Bansevicius, Ramutis
last_name: Bansevicius
citation:
ama: Lucinskis R, Mazeika D, Hemsel T, Bansevicius R. The experimental research
of piezoelectric actuator with two vectors of polarization direction. MECHANIKA.
2010.
apa: Lucinskis, R., Mazeika, D., Hemsel, T., & Bansevicius, R. (2010). The experimental
research of piezoelectric actuator with two vectors of polarization direction.
MECHANIKA.
bibtex: '@article{Lucinskis_Mazeika_Hemsel_Bansevicius_2010, title={The experimental
research of piezoelectric actuator with two vectors of polarization direction},
journal={MECHANIKA}, author={Lucinskis, Raimundas and Mazeika, Dalius and Hemsel,
Tobias and Bansevicius, Ramutis}, year={2010} }'
chicago: Lucinskis, Raimundas, Dalius Mazeika, Tobias Hemsel, and Ramutis Bansevicius.
“The Experimental Research of Piezoelectric Actuator with Two Vectors of Polarization
Direction.” MECHANIKA, 2010.
ieee: R. Lucinskis, D. Mazeika, T. Hemsel, and R. Bansevicius, “The experimental
research of piezoelectric actuator with two vectors of polarization direction,”
MECHANIKA, 2010.
mla: Lucinskis, Raimundas, et al. “The Experimental Research of Piezoelectric Actuator
with Two Vectors of Polarization Direction.” MECHANIKA, 2010.
short: R. Lucinskis, D. Mazeika, T. Hemsel, R. Bansevicius, MECHANIKA (2010).
date_created: 2019-05-13T10:18:38Z
date_updated: 2022-01-06T07:04:19Z
department:
- _id: '151'
language:
- iso: eng
publication: MECHANIKA
publication_identifier:
issn:
- 1948-5719
quality_controlled: '1'
status: public
title: The experimental research of piezoelectric actuator with two vectors of polarization
direction
type: journal_article
user_id: '55222'
year: '2010'
...
---
_id: '9758'
abstract:
- lang: eng
text: As a lead-free piezoelectric ceramics, (K,Na)NbO$_{3}$ is a promising material
because of its good piezoelectric properties. In this study, (K$_{1-x}$Na$_{x}$)NbO$_{3}$
ceramics were synthesized from a KNbO$_{3}$ and NaNbO$_{3}$ mixture powder prepared
by the hydrothermal reaction. The hydrothermal reaction enables the production
of high quality powder for the ceramics fabrication process. To obtain (K$_{1-x}$Na$_{x}$)NbO$_{3}$
ceramics, these two powders KNbO$_{3}$ and NaNbO$_{3}$ were mixed and then sintered
together. X-Ray diffraction analysis revealed that the solid solution ceramics
(K$_{1-x}$Na$_{x}$)NbO$_{3}$ was produced by the sintering process. The K/Na ratio
in (K$_{1-x}$Na$_{x}$)NbO$_{3}$ ceramics was optimized for the best piezoelectric
properties. The optimized forms was (K$_{0.48}$Na$_{0.52}$)NbO$_{3}$, which showed
the following piezoelectric properties; k$_{33}$=0.56, d$_{33}$=114pC/N. In addition,
the ferroelectric properties, P$_{r}$=7.72mC/cm$^{2}$, E$_{c}$=857V/mm, and the
Curie temperature T$_{c}$=420$_{o}$C were also measured.
author:
- first_name: Takafumi
full_name: Maeda, Takafumi
last_name: Maeda
- first_name: Norihito
full_name: Takiguchi, Norihito
last_name: Takiguchi
- first_name: Takeshi
full_name: Morita, Takeshi
last_name: Morita
- first_name: Mutsuo
full_name: Ishikawa, Mutsuo
last_name: Ishikawa
- first_name: Tobias
full_name: Hemsel, Tobias
id: '210'
last_name: Hemsel
citation:
ama: Maeda T, Takiguchi N, Morita T, Ishikawa M, Hemsel T. Hydrothermal (K1-xNax)NbO3
Lead-free Piezoelectric Ceramics. Journal of Korean Physical Society. 2010;57(4):924-928.
doi:10.3938/jkps.57.924
apa: Maeda, T., Takiguchi, N., Morita, T., Ishikawa, M., & Hemsel, T. (2010).
Hydrothermal (K1-xNax)NbO3 Lead-free Piezoelectric Ceramics. Journal of Korean
Physical Society, 57(4), 924–928. https://doi.org/10.3938/jkps.57.924
bibtex: '@article{Maeda_Takiguchi_Morita_Ishikawa_Hemsel_2010, title={Hydrothermal
(K1-xNax)NbO3 Lead-free Piezoelectric Ceramics}, volume={57}, DOI={10.3938/jkps.57.924},
number={4}, journal={Journal of Korean Physical Society}, author={Maeda, Takafumi
and Takiguchi, Norihito and Morita, Takeshi and Ishikawa, Mutsuo and Hemsel, Tobias},
year={2010}, pages={924–928} }'
chicago: 'Maeda, Takafumi, Norihito Takiguchi, Takeshi Morita, Mutsuo Ishikawa,
and Tobias Hemsel. “Hydrothermal (K1-XNax)NbO3 Lead-Free Piezoelectric Ceramics.”
Journal of Korean Physical Society 57, no. 4 (2010): 924–28. https://doi.org/10.3938/jkps.57.924.'
ieee: T. Maeda, N. Takiguchi, T. Morita, M. Ishikawa, and T. Hemsel, “Hydrothermal
(K1-xNax)NbO3 Lead-free Piezoelectric Ceramics,” Journal of Korean Physical
Society, vol. 57, no. 4, pp. 924–928, 2010.
mla: Maeda, Takafumi, et al. “Hydrothermal (K1-XNax)NbO3 Lead-Free Piezoelectric
Ceramics.” Journal of Korean Physical Society, vol. 57, no. 4, 2010, pp.
924–28, doi:10.3938/jkps.57.924.
short: T. Maeda, N. Takiguchi, T. Morita, M. Ishikawa, T. Hemsel, Journal of Korean
Physical Society 57 (2010) 924–928.
date_created: 2019-05-13T10:19:43Z
date_updated: 2022-01-06T07:04:19Z
department:
- _id: '151'
doi: 10.3938/jkps.57.924
intvolume: ' 57'
issue: '4'
keyword:
- Lead-free piezoelectric material
- KNN
- Hydrothermal method
language:
- iso: eng
page: 924-928
publication: Journal of Korean Physical Society
publication_identifier:
issn:
- 1948-5719
quality_controlled: '1'
status: public
title: Hydrothermal (K1-xNax)NbO3 Lead-free Piezoelectric Ceramics
type: journal_article
user_id: '55222'
volume: 57
year: '2010'
...
---
_id: '9759'
abstract:
- lang: eng
text: Among various lead-free piezoelectric materials, (K,Na)NbO$_{3}$ is a very
promising candidate. In this study, (K,Na)NbO$_{3}$ ceramics were sintered from
mixed (K,Na)NbO$_{3}$ and NaNbO$_{3}$ powders prepared by hydrothermal reaction.
These two powders were mixed with distilled water in a KNbO$_{3}$/NaNbO$_{3}$
molar ratio of 1. After sintering the mixed powder, the solid solution of (Na,K)NbO$_{3}$
ceramics was obtained. The electrical properties such as the electromechanical
coupling factors k$_{p}$ and k$_{33}$, the mechanical quality factor, Q$_{m}$,
and the piezoelectric constant d$_{33}$ of the sintered (K,Na)NbO$_{3}$ ceramics
were 0.32, 0.48, 71 (radial mode), 118 ((33)mode), and 107 pC/N, respectively.
author:
- first_name: Takafumi
full_name: Maeda, Takafumi
last_name: Maeda
- first_name: Norihito
full_name: Takiguchi, Norihito
last_name: Takiguchi
- first_name: Takeshi
full_name: Morita, Takeshi
last_name: Morita
- first_name: Mutsuo
full_name: Ishikawa, Mutsuo
last_name: Ishikawa
- first_name: Tobias
full_name: Hemsel, Tobias
id: '210'
last_name: Hemsel
citation:
ama: Maeda T, Takiguchi N, Morita T, Ishikawa M, Hemsel T. (K,Na)NbO3 lead-free
piezoelectric ceramics synthesized from hydrothermal powders. Materials Letters.
2010;64(2):125-128. doi:10.1016/j.matlet.2009.10.012
apa: Maeda, T., Takiguchi, N., Morita, T., Ishikawa, M., & Hemsel, T. (2010).
(K,Na)NbO3 lead-free piezoelectric ceramics synthesized from hydrothermal powders.
Materials Letters, 64(2), 125–128. https://doi.org/10.1016/j.matlet.2009.10.012
bibtex: '@article{Maeda_Takiguchi_Morita_Ishikawa_Hemsel_2010, title={(K,Na)NbO3
lead-free piezoelectric ceramics synthesized from hydrothermal powders}, volume={64},
DOI={10.1016/j.matlet.2009.10.012},
number={2}, journal={Materials Letters}, author={Maeda, Takafumi and Takiguchi,
Norihito and Morita, Takeshi and Ishikawa, Mutsuo and Hemsel, Tobias}, year={2010},
pages={125–128} }'
chicago: 'Maeda, Takafumi, Norihito Takiguchi, Takeshi Morita, Mutsuo Ishikawa,
and Tobias Hemsel. “(K,Na)NbO3 Lead-Free Piezoelectric Ceramics Synthesized from
Hydrothermal Powders.” Materials Letters 64, no. 2 (2010): 125–28. https://doi.org/10.1016/j.matlet.2009.10.012.'
ieee: T. Maeda, N. Takiguchi, T. Morita, M. Ishikawa, and T. Hemsel, “(K,Na)NbO3
lead-free piezoelectric ceramics synthesized from hydrothermal powders,” Materials
Letters, vol. 64, no. 2, pp. 125–128, 2010.
mla: Maeda, Takafumi, et al. “(K,Na)NbO3 Lead-Free Piezoelectric Ceramics Synthesized
from Hydrothermal Powders.” Materials Letters, vol. 64, no. 2, 2010, pp.
125–28, doi:10.1016/j.matlet.2009.10.012.
short: T. Maeda, N. Takiguchi, T. Morita, M. Ishikawa, T. Hemsel, Materials Letters
64 (2010) 125–128.
date_created: 2019-05-13T10:21:17Z
date_updated: 2022-01-06T07:04:19Z
department:
- _id: '151'
doi: 10.1016/j.matlet.2009.10.012
intvolume: ' 64'
issue: '2'
keyword:
- Lead-free piezoelectric material
- (K
- Na)NbO$_{3}$ ceramics
- Sintering solid solution
- Piezoelectric properties
language:
- iso: eng
page: 125-128
publication: Materials Letters
publication_identifier:
issn:
- 1948-5719
quality_controlled: '1'
status: public
title: (K,Na)NbO3 lead-free piezoelectric ceramics synthesized from hydrothermal powders
type: journal_article
user_id: '55222'
volume: 64
year: '2010'
...
---
_id: '9760'
abstract:
- lang: eng
text: Self-optimizing systems are able to adapt their behavior autonomously according
to their current self-determined objectives. Unforeseen influences could lead
to dependability-critical behavior of the system. Methods are required which secure
self-optimizing systems during operation. These methods to increase the dependability
of the system should already be taken into consideration in the design process.
This paper presents a guideline for the dependability-oriented design of self-optimizing
systems, which integrates established classical methods like failure mode and
effects analysis as well as methods based on self-optimization. On the one hand
self-optimization is used to increase the dependability of the system by integrating
objectives like safety, availability, and reliability to the objectives of the
system. On the other hand methods are required to ensure the self-optimization
itself. As basis for this guideline serves the principle solution of the system.
The six phases of the guideline extend the design process and lead to an enhanced
principle solution. Additionally, the guideline illustrates phases to implement
and validate the self-optimizing system. The proposed guideline is applied to
an innovative rail-bound vehicle, called RailCab, which is equipped with self-optimizing
function modules.
author:
- first_name: Christoph
full_name: Sondermann-Wölke, Christoph
last_name: Sondermann-Wölke
- first_name: Tobias
full_name: Hemsel, Tobias
id: '210'
last_name: Hemsel
- first_name: Walter
full_name: Sextro, Walter
id: '21220'
last_name: Sextro
- first_name: Jürgen
full_name: Gausemeier, Jürgen
last_name: Gausemeier
- first_name: Sebastian
full_name: Pook, Sebastian
last_name: Pook
citation:
ama: 'Sondermann-Wölke C, Hemsel T, Sextro W, Gausemeier J, Pook S. Guideline for
the dependability-oriented design of self-optimizing systems. In: Industrial
Informatics (INDIN), 2010 8th IEEE International Conference On. ; 2010:739-744.
doi:10.1109/INDIN.2010.5549490'
apa: Sondermann-Wölke, C., Hemsel, T., Sextro, W., Gausemeier, J., & Pook, S.
(2010). Guideline for the dependability-oriented design of self-optimizing systems.
In Industrial Informatics (INDIN), 2010 8th IEEE International Conference on
(pp. 739–744). https://doi.org/10.1109/INDIN.2010.5549490
bibtex: '@inproceedings{Sondermann-Wölke_Hemsel_Sextro_Gausemeier_Pook_2010, title={Guideline
for the dependability-oriented design of self-optimizing systems}, DOI={10.1109/INDIN.2010.5549490},
booktitle={Industrial Informatics (INDIN), 2010 8th IEEE International Conference
on}, author={Sondermann-Wölke, Christoph and Hemsel, Tobias and Sextro, Walter
and Gausemeier, Jürgen and Pook, Sebastian}, year={2010}, pages={739–744} }'
chicago: Sondermann-Wölke, Christoph, Tobias Hemsel, Walter Sextro, Jürgen Gausemeier,
and Sebastian Pook. “Guideline for the Dependability-Oriented Design of Self-Optimizing
Systems.” In Industrial Informatics (INDIN), 2010 8th IEEE International Conference
On, 739–44, 2010. https://doi.org/10.1109/INDIN.2010.5549490.
ieee: C. Sondermann-Wölke, T. Hemsel, W. Sextro, J. Gausemeier, and S. Pook, “Guideline
for the dependability-oriented design of self-optimizing systems,” in Industrial
Informatics (INDIN), 2010 8th IEEE International Conference on, 2010, pp.
739–744.
mla: Sondermann-Wölke, Christoph, et al. “Guideline for the Dependability-Oriented
Design of Self-Optimizing Systems.” Industrial Informatics (INDIN), 2010 8th
IEEE International Conference On, 2010, pp. 739–44, doi:10.1109/INDIN.2010.5549490.
short: 'C. Sondermann-Wölke, T. Hemsel, W. Sextro, J. Gausemeier, S. Pook, in: Industrial
Informatics (INDIN), 2010 8th IEEE International Conference On, 2010, pp. 739–744.'
date_created: 2019-05-13T10:25:26Z
date_updated: 2022-01-06T07:04:19Z
department:
- _id: '151'
doi: 10.1109/INDIN.2010.5549490
keyword:
- RailCab
- dependability-critical behavior
- dependability-oriented design
- failure mode
- rail-bound vehicle
- secure self-optimizing systems
- self-optimizing function modules
- optimisation
- railways
- self-adjusting systems
language:
- iso: eng
page: 739 -744
publication: Industrial Informatics (INDIN), 2010 8th IEEE International Conference
on
quality_controlled: '1'
status: public
title: Guideline for the dependability-oriented design of self-optimizing systems
type: conference
user_id: '55222'
year: '2010'
...
---
_id: '9761'
abstract:
- lang: eng
text: New mechatronic systems, called self-optimizing systems, are able to adapt
their behavior according to environmental, user and system specific influences.
Self-optimizing systems are complex and due to their non-deterministic behavior
comprise hidden risks, which cannot be foreseen in the design phase of the system.
Therefore, modifications of the ISO 17359 condition monitoring policy for being
able to cope with this new kind of systems are presented. Besides avoiding critical
situations evoked by self-optimization, the proposed concept uses self-optimization
to increase the dependability of the system. This concept is applied to the active
guidance module of an innovative rail-bound vehicle. First test drives provide
information for the enhancement of the implementation of realtime switching to
appropriate control strategies. The different control strategies are investigated
in detail. It is illustrated that influences on the system like different track
sections or the desired velocity of the RailCab effect the system and can lead
to a higher amount of flange contacts, which indicate higher wear and thus a reduction
of the availability of the system. Therefore, these influences should be minded
within the condition monitoring policy. Consequently, this article presents the
condition monitoring policy for self-optimizing function modules and its application
to the active railway guidance module.
author:
- first_name: Christoph
full_name: Sondermann-Wölke, Christoph
last_name: Sondermann-Wölke
- first_name: Walter
full_name: Sextro, Walter
id: '21220'
last_name: Sextro
citation:
ama: Sondermann-Wölke C, Sextro W. Integration of Condition Monitoring in Self-optimizing
Function Modules Applied to the Active Railway Guidance Module. International
Journal On Advances in Intelligent Systems. 2010;3(1-3):65-74.
apa: Sondermann-Wölke, C., & Sextro, W. (2010). Integration of Condition Monitoring
in Self-optimizing Function Modules Applied to the Active Railway Guidance Module.
International Journal On Advances in Intelligent Systems, 3(1–3),
65–74.
bibtex: '@article{Sondermann-Wölke_Sextro_2010, title={Integration of Condition
Monitoring in Self-optimizing Function Modules Applied to the Active Railway Guidance
Module}, volume={3}, number={1–3}, journal={International Journal On Advances
in Intelligent Systems}, author={Sondermann-Wölke, Christoph and Sextro, Walter},
year={2010}, pages={65–74} }'
chicago: 'Sondermann-Wölke, Christoph, and Walter Sextro. “Integration of Condition
Monitoring in Self-Optimizing Function Modules Applied to the Active Railway Guidance
Module.” International Journal On Advances in Intelligent Systems 3, no.
1–3 (2010): 65–74.'
ieee: C. Sondermann-Wölke and W. Sextro, “Integration of Condition Monitoring in
Self-optimizing Function Modules Applied to the Active Railway Guidance Module,”
International Journal On Advances in Intelligent Systems, vol. 3, no. 1–3,
pp. 65–74, 2010.
mla: Sondermann-Wölke, Christoph, and Walter Sextro. “Integration of Condition Monitoring
in Self-Optimizing Function Modules Applied to the Active Railway Guidance Module.”
International Journal On Advances in Intelligent Systems, vol. 3, no. 1–3,
2010, pp. 65–74.
short: C. Sondermann-Wölke, W. Sextro, International Journal On Advances in Intelligent
Systems 3 (2010) 65–74.
date_created: 2019-05-13T10:27:02Z
date_updated: 2022-01-06T07:04:19Z
department:
- _id: '151'
intvolume: ' 3'
issue: 1 - 3
keyword:
- dependability
- condition monitoring
- selfoptimization
- active railway guidance module
language:
- iso: eng
page: 65 - 74
publication: International Journal On Advances in Intelligent Systems
quality_controlled: '1'
status: public
title: Integration of Condition Monitoring in Self-optimizing Function Modules Applied
to the Active Railway Guidance Module
type: journal_article
user_id: '55222'
volume: 3
year: '2010'
...
---
_id: '9762'
abstract:
- lang: eng
text: Die erweiterten Möglichkeiten der Informationsverarbeitung mechatronischer
Systeme erlauben es, mechatronische Systeme selbstoptimierend zu gestalten. Dabei
bezieht sich die Selbstoptimierung auf die Fähigkeit des Systems, sich an die
aktuelle Umfeldsituation anzupassen; wobei das System im Allgemeinen mehrere relevante
Ziele verfolgt. Wurde eine Umfeldveränderung bemerkt, so müssen diese Ziele an
die neue Situation angepasst und das resultierende Verhalten ausgewählt werden.
In diesem Beitrag wird das selbstoptimierende Spurführungsmodul näher untersucht.
Das Spurführungsmodul ist Bestandteil eines innovativen schienengebundenen Verkehrssystems,
genannt RailCab, und dient zur Lenkung des einzelnen Fahrzeugs. Ziele des Spurführungsmoduls
bestehen darin, die Verlässlichkeit des Spurführungsmoduls zu erhöhen sowie möglichst
wenig Energie zu verbrauchen. Um kritische Systemzustände zu erkennen bzw. frühzeitig
zu verhindern wird eine Vorgehensweise zur Einrichtung einer Zustandsüberwachung
für selbstoptimierende Systeme beschrieben. Diese wird auf dem realen Versuchsträger
im Maßstab 1:2,5 implementiert. Die Auswertung von Versuchsfahrten zeigt, dass
gerade beim Auftreten eines Fehlers das Umschalten vom Ziel ''Energieverbrauch
minimieren`` auf das Ziel ''Verlässlichkeit maximieren`` sinnvoll ist.
author:
- first_name: Christoph
full_name: Sondermann-Wölke, Christoph
last_name: Sondermann-Wölke
- first_name: Walter
full_name: Sextro, Walter
id: '21220'
last_name: Sextro
- first_name: Jens
full_name: Geisler, Jens
last_name: Geisler
- first_name: Ansgar
full_name: Trächtler, Ansgar
last_name: Trächtler
citation:
ama: 'Sondermann-Wölke C, Sextro W, Geisler J, Trächtler A. Experimentelle Untersuchung
der Selbstoptimierung innerhalb des RailCab-Spurführungsmoduls. In: Gausemeier
J, Rammig FJ, Trächtler A, eds. Entwurf Mechatronischer Systeme. Vol 272.
HNI-Verlagsschriftenreihe. Paderborn; 2010:411-420.'
apa: Sondermann-Wölke, C., Sextro, W., Geisler, J., & Trächtler, A. (2010).
Experimentelle Untersuchung der Selbstoptimierung innerhalb des RailCab-Spurführungsmoduls.
In J. Gausemeier, F. J. Rammig, & A. Trächtler (Eds.), Entwurf mechatronischer
Systeme (Vol. 272, pp. 411–420). Paderborn.
bibtex: '@inproceedings{Sondermann-Wölke_Sextro_Geisler_Trächtler_2010, place={Paderborn},
series={HNI-Verlagsschriftenreihe}, title={Experimentelle Untersuchung der Selbstoptimierung
innerhalb des RailCab-Spurführungsmoduls}, volume={272}, booktitle={Entwurf mechatronischer
Systeme}, author={Sondermann-Wölke, Christoph and Sextro, Walter and Geisler,
Jens and Trächtler, Ansgar}, editor={Gausemeier, Jürgen and Rammig, Frans Josef
and Trächtler, AnsgarEditors}, year={2010}, pages={411–420}, collection={HNI-Verlagsschriftenreihe}
}'
chicago: Sondermann-Wölke, Christoph, Walter Sextro, Jens Geisler, and Ansgar Trächtler.
“Experimentelle Untersuchung Der Selbstoptimierung Innerhalb Des RailCab-Spurführungsmoduls.”
In Entwurf Mechatronischer Systeme, edited by Jürgen Gausemeier, Frans
Josef Rammig, and Ansgar Trächtler, 272:411–20. HNI-Verlagsschriftenreihe. Paderborn,
2010.
ieee: C. Sondermann-Wölke, W. Sextro, J. Geisler, and A. Trächtler, “Experimentelle
Untersuchung der Selbstoptimierung innerhalb des RailCab-Spurführungsmoduls,”
in Entwurf mechatronischer Systeme, 2010, vol. 272, pp. 411–420.
mla: Sondermann-Wölke, Christoph, et al. “Experimentelle Untersuchung Der Selbstoptimierung
Innerhalb Des RailCab-Spurführungsmoduls.” Entwurf Mechatronischer Systeme,
edited by Jürgen Gausemeier et al., vol. 272, 2010, pp. 411–20.
short: 'C. Sondermann-Wölke, W. Sextro, J. Geisler, A. Trächtler, in: J. Gausemeier,
F.J. Rammig, A. Trächtler (Eds.), Entwurf Mechatronischer Systeme, Paderborn,
2010, pp. 411–420.'
date_created: 2019-05-13T10:28:04Z
date_updated: 2022-01-06T07:04:19Z
department:
- _id: '151'
editor:
- first_name: Jürgen
full_name: Gausemeier, Jürgen
last_name: Gausemeier
- first_name: Frans Josef
full_name: Rammig, Frans Josef
last_name: Rammig
- first_name: Ansgar
full_name: Trächtler, Ansgar
last_name: Trächtler
intvolume: ' 272'
keyword:
- Selbstoptimierung
- Spurführungsmodul
language:
- iso: eng
page: 411 - 420
place: Paderborn
publication: Entwurf mechatronischer Systeme
quality_controlled: '1'
series_title: HNI-Verlagsschriftenreihe
status: public
title: Experimentelle Untersuchung der Selbstoptimierung innerhalb des RailCab-Spurführungsmoduls
type: conference
user_id: '55222'
volume: 272
year: '2010'
...
---
_id: '9763'
abstract:
- lang: eng
text: Recent advances in information processing enable new kinds of technical systems,
called self-optimizing systems. These systems are able to adapt their objectives
and their behavior according to the current situation and influences autonomously.
This behavior adaptation is non-deterministic and hence self-optimization is a
risk to the system, e.g. if the result of the self-optimization process does not
match the suddenly changed situation. In contrary, self-optimization could be
used to increase the dependability by pursuing objectives like reliability and
availability. In our preceding publications we introduced the so called multi-level
dependability concept to cope with this new kind of systems (cf. [6]). This concept
comprises the monitoring of the system behavior, the classification of the current
situation, and the selection of the appropriate measure, if reliability limits
are exceeded. In this paper we present for the first time experimental results.
The dependability concept is implemented in the self-optimizing active guidance
system of a railway vehicle. The test drives illustrate clearly that the proposed
concept is able to cope with, e.g., sensor failures, and is able to increase the
reliability and availability of the active guidance module.
author:
- first_name: Christoph
full_name: Sondermann-Wölke, Christoph
last_name: Sondermann-Wölke
- first_name: Jens
full_name: Geisler, Jens
last_name: Geisler
- first_name: Walter
full_name: Sextro, Walter
id: '21220'
last_name: Sextro
citation:
ama: 'Sondermann-Wölke C, Geisler J, Sextro W. Increasing the reliability of a self-optimizing
railway guidance system. In: Reliability and Maintainability Symposium (RAMS),
2010 Proceedings - Annual. ; 2010:1-6. doi:10.1109/RAMS.2010.5448080'
apa: Sondermann-Wölke, C., Geisler, J., & Sextro, W. (2010). Increasing the
reliability of a self-optimizing railway guidance system. In Reliability and
Maintainability Symposium (RAMS), 2010 Proceedings - Annual (pp. 1–6). https://doi.org/10.1109/RAMS.2010.5448080
bibtex: '@inproceedings{Sondermann-Wölke_Geisler_Sextro_2010, title={Increasing
the reliability of a self-optimizing railway guidance system}, DOI={10.1109/RAMS.2010.5448080},
booktitle={Reliability and Maintainability Symposium (RAMS), 2010 Proceedings
- Annual}, author={Sondermann-Wölke, Christoph and Geisler, Jens and Sextro, Walter},
year={2010}, pages={1–6} }'
chicago: Sondermann-Wölke, Christoph, Jens Geisler, and Walter Sextro. “Increasing
the Reliability of a Self-Optimizing Railway Guidance System.” In Reliability
and Maintainability Symposium (RAMS), 2010 Proceedings - Annual, 1–6, 2010.
https://doi.org/10.1109/RAMS.2010.5448080.
ieee: C. Sondermann-Wölke, J. Geisler, and W. Sextro, “Increasing the reliability
of a self-optimizing railway guidance system,” in Reliability and Maintainability
Symposium (RAMS), 2010 Proceedings - Annual, 2010, pp. 1–6.
mla: Sondermann-Wölke, Christoph, et al. “Increasing the Reliability of a Self-Optimizing
Railway Guidance System.” Reliability and Maintainability Symposium (RAMS),
2010 Proceedings - Annual, 2010, pp. 1–6, doi:10.1109/RAMS.2010.5448080.
short: 'C. Sondermann-Wölke, J. Geisler, W. Sextro, in: Reliability and Maintainability
Symposium (RAMS), 2010 Proceedings - Annual, 2010, pp. 1–6.'
date_created: 2019-05-13T10:35:39Z
date_updated: 2022-01-06T07:04:19Z
department:
- _id: '151'
doi: 10.1109/RAMS.2010.5448080
keyword:
- availability
- dependability concept
- multilevel dependability concept
- railway vehicle
- reliability
- self optimizing active guidance system
- self optimizing railway guidance system
- situation classification
- system behavior monitoring
- optimal control
- railways
- reliability theory
- self-adjusting systems
language:
- iso: eng
page: 1 -6
publication: Reliability and Maintainability Symposium (RAMS), 2010 Proceedings -
Annual
publication_identifier:
issn:
- 0149-144X
quality_controlled: '1'
status: public
title: Increasing the reliability of a self-optimizing railway guidance system
type: conference
user_id: '55222'
year: '2010'
...
---
_id: '9764'
author:
- first_name: Christoph
full_name: Tomberger, Christoph
last_name: Tomberger
- first_name: Peter
full_name: Dietmaier, Peter
last_name: Dietmaier
- first_name: Rosenberger
full_name: Martin, Rosenberger
last_name: Martin
- first_name: Walter
full_name: Sextro, Walter
id: '21220'
last_name: Sextro
- first_name: Klaus
full_name: Six, Klaus
last_name: Six
citation:
ama: Tomberger C, Dietmaier P, Martin R, Sextro W, Six K. Einfluss von Oberflächenrauheit,
fluiden Zwischenschichten und Kontakttemperaturen auf den Kraftschluss zwischen
Rad und Schiene. ZEVrail. 2010;134:127-135.
apa: Tomberger, C., Dietmaier, P., Martin, R., Sextro, W., & Six, K. (2010).
Einfluss von Oberflächenrauheit, fluiden Zwischenschichten und Kontakttemperaturen
auf den Kraftschluss zwischen Rad und Schiene. ZEVrail, 134, 127–135.
bibtex: '@article{Tomberger_Dietmaier_Martin_Sextro_Six_2010, title={Einfluss von
Oberflächenrauheit, fluiden Zwischenschichten und Kontakttemperaturen auf den
Kraftschluss zwischen Rad und Schiene}, volume={134}, journal={ZEVrail}, author={Tomberger,
Christoph and Dietmaier, Peter and Martin, Rosenberger and Sextro, Walter and
Six, Klaus}, year={2010}, pages={127–135} }'
chicago: 'Tomberger, Christoph, Peter Dietmaier, Rosenberger Martin, Walter Sextro,
and Klaus Six. “Einfluss von Oberflächenrauheit, Fluiden Zwischenschichten Und
Kontakttemperaturen Auf Den Kraftschluss Zwischen Rad Und Schiene.” ZEVrail
134 (2010): 127–35.'
ieee: C. Tomberger, P. Dietmaier, R. Martin, W. Sextro, and K. Six, “Einfluss von
Oberflächenrauheit, fluiden Zwischenschichten und Kontakttemperaturen auf den
Kraftschluss zwischen Rad und Schiene,” ZEVrail, vol. 134, pp. 127–135,
2010.
mla: Tomberger, Christoph, et al. “Einfluss von Oberflächenrauheit, Fluiden Zwischenschichten
Und Kontakttemperaturen Auf Den Kraftschluss Zwischen Rad Und Schiene.” ZEVrail,
vol. 134, 2010, pp. 127–35.
short: C. Tomberger, P. Dietmaier, R. Martin, W. Sextro, K. Six, ZEVrail 134 (2010)
127–135.
date_created: 2019-05-13T10:37:07Z
date_updated: 2022-01-06T07:04:19Z
department:
- _id: '151'
intvolume: ' 134'
language:
- iso: eng
page: 127-135
publication: ZEVrail
publication_identifier:
issn:
- 0043-1648
status: public
title: Einfluss von Oberflächenrauheit, fluiden Zwischenschichten und Kontakttemperaturen
auf den Kraftschluss zwischen Rad und Schiene
type: journal_article
user_id: '55222'
volume: 134
year: '2010'
...
---
_id: '4129'
abstract:
- lang: eng
text: We study a single quantum dot molecule doped with one electron in the presence
of electron-phonon coupling. Both diagonal and off-diagonal interactions representing
real and virtual processes with acoustic phonons via deformation potential and
piezoelectric coupling are taken into account. We employ a non-perturbative quantum
kinetic theory and show that the phonon-mediated relaxation is dominated by an
electron tunneling on a picosecond time scale.A dependence of the relaxation on
the temperature and the strength of the tunneling coupling is analyzed.
article_number: '012035'
article_type: original
author:
- first_name: Anna
full_name: Grodecka-Grad, Anna
last_name: Grodecka-Grad
- first_name: Jens
full_name: Förstner, Jens
id: '158'
last_name: Förstner
orcid: 0000-0001-7059-9862
citation:
ama: 'Grodecka-Grad A, Förstner J. Phonon-mediated relaxation in doped quantum dot
molecules. Journal of Physics: Conference Series. 2010;245. doi:10.1088/1742-6596/245/1/012035'
apa: 'Grodecka-Grad, A., & Förstner, J. (2010). Phonon-mediated relaxation in
doped quantum dot molecules. Journal of Physics: Conference Series, 245.
https://doi.org/10.1088/1742-6596/245/1/012035'
bibtex: '@article{Grodecka-Grad_Förstner_2010, title={Phonon-mediated relaxation
in doped quantum dot molecules}, volume={245}, DOI={10.1088/1742-6596/245/1/012035},
number={012035}, journal={Journal of Physics: Conference Series}, publisher={IOP
Publishing}, author={Grodecka-Grad, Anna and Förstner, Jens}, year={2010} }'
chicago: 'Grodecka-Grad, Anna, and Jens Förstner. “Phonon-Mediated Relaxation in
Doped Quantum Dot Molecules.” Journal of Physics: Conference Series 245
(2010). https://doi.org/10.1088/1742-6596/245/1/012035.'
ieee: 'A. Grodecka-Grad and J. Förstner, “Phonon-mediated relaxation in doped quantum
dot molecules,” Journal of Physics: Conference Series, vol. 245, 2010.'
mla: 'Grodecka-Grad, Anna, and Jens Förstner. “Phonon-Mediated Relaxation in Doped
Quantum Dot Molecules.” Journal of Physics: Conference Series, vol. 245,
012035, IOP Publishing, 2010, doi:10.1088/1742-6596/245/1/012035.'
short: 'A. Grodecka-Grad, J. Förstner, Journal of Physics: Conference Series 245
(2010).'
date_created: 2018-08-27T10:33:04Z
date_updated: 2022-01-06T07:00:22Z
ddc:
- '530'
department:
- _id: '15'
doi: 10.1088/1742-6596/245/1/012035
file:
- access_level: closed
content_type: application/pdf
creator: hclaudia
date_created: 2018-08-27T10:34:26Z
date_updated: 2018-08-27T10:34:26Z
file_id: '4130'
file_name: 2010 Grodecka-Grad,Förstner_Phonon-mediated relaxation in doped quantum
dot molecules.pdf
file_size: 896613
relation: main_file
success: 1
file_date_updated: 2018-08-27T10:34:26Z
has_accepted_license: '1'
intvolume: ' 245'
keyword:
- tet_topic_qd
language:
- iso: eng
publication: 'Journal of Physics: Conference Series'
publication_identifier:
issn:
- 1742-6596
publication_status: published
publisher: IOP Publishing
status: public
title: Phonon-mediated relaxation in doped quantum dot molecules
type: journal_article
user_id: '55706'
volume: 245
year: '2010'
...
---
_id: '4144'
abstract:
- lang: eng
text: "Non-polar relaxed cubic GaN was grown by molecular beam epitaxy (MBE) on
nano-patterned 3C-SiC/Si \r\n(0 0 1)substrates with negligible hexagonal content
and less defect density than in planar cubic GaN layers.Nano-patterning of 3C-SiC/Si(001)
is achieved by self-ordered colloidal masks for the first time. The method presented
here offers the possibility to create nano-patterned cubic GaN without the need
for a GaN etching process andt hus isa potential alternative to the conventional
top–down fabrication techniques."
article_type: original
author:
- first_name: R.M.
full_name: Kemper, R.M.
last_name: Kemper
- first_name: M.
full_name: Weinl, M.
last_name: Weinl
- first_name: C.
full_name: Mietze, C.
last_name: Mietze
- first_name: M.
full_name: Häberlen, M.
last_name: Häberlen
- first_name: T.
full_name: Schupp, T.
last_name: Schupp
- first_name: E.
full_name: Tschumak, E.
last_name: Tschumak
- first_name: Jörg
full_name: Lindner, Jörg
id: '20797'
last_name: Lindner
- first_name: K.
full_name: Lischka, K.
last_name: Lischka
- first_name: 'Donald '
full_name: 'As, Donald '
last_name: As
citation:
ama: Kemper RM, Weinl M, Mietze C, et al. Growth of cubic GaN on nano-patterned
3C-SiC/Si (001) substrates. Journal of Crystal Growth. 2010;323(1):84-87.
doi:10.1016/j.jcrysgro.2010.12.042
apa: Kemper, R. M., Weinl, M., Mietze, C., Häberlen, M., Schupp, T., Tschumak, E.,
… As, D. (2010). Growth of cubic GaN on nano-patterned 3C-SiC/Si (001) substrates.
Journal of Crystal Growth, 323(1), 84–87. https://doi.org/10.1016/j.jcrysgro.2010.12.042
bibtex: '@article{Kemper_Weinl_Mietze_Häberlen_Schupp_Tschumak_Lindner_Lischka_As_2010,
title={Growth of cubic GaN on nano-patterned 3C-SiC/Si (001) substrates}, volume={323},
DOI={10.1016/j.jcrysgro.2010.12.042},
number={1}, journal={Journal of Crystal Growth}, publisher={Elsevier BV}, author={Kemper,
R.M. and Weinl, M. and Mietze, C. and Häberlen, M. and Schupp, T. and Tschumak,
E. and Lindner, Jörg and Lischka, K. and As, Donald }, year={2010}, pages={84–87}
}'
chicago: 'Kemper, R.M., M. Weinl, C. Mietze, M. Häberlen, T. Schupp, E. Tschumak,
Jörg Lindner, K. Lischka, and Donald As. “Growth of Cubic GaN on Nano-Patterned
3C-SiC/Si (001) Substrates.” Journal of Crystal Growth 323, no. 1 (2010):
84–87. https://doi.org/10.1016/j.jcrysgro.2010.12.042.'
ieee: R. M. Kemper et al., “Growth of cubic GaN on nano-patterned 3C-SiC/Si
(001) substrates,” Journal of Crystal Growth, vol. 323, no. 1, pp. 84–87,
2010.
mla: Kemper, R. M., et al. “Growth of Cubic GaN on Nano-Patterned 3C-SiC/Si (001)
Substrates.” Journal of Crystal Growth, vol. 323, no. 1, Elsevier BV, 2010,
pp. 84–87, doi:10.1016/j.jcrysgro.2010.12.042.
short: R.M. Kemper, M. Weinl, C. Mietze, M. Häberlen, T. Schupp, E. Tschumak, J.
Lindner, K. Lischka, D. As, Journal of Crystal Growth 323 (2010) 84–87.
date_created: 2018-08-27T12:34:33Z
date_updated: 2022-01-06T07:00:24Z
ddc:
- '530'
department:
- _id: '15'
- _id: '286'
doi: 10.1016/j.jcrysgro.2010.12.042
file:
- access_level: closed
content_type: application/pdf
creator: hclaudia
date_created: 2018-08-27T12:35:32Z
date_updated: 2018-08-27T12:35:32Z
file_id: '4145'
file_name: Growth of cubic GaN on nano-patterned 3C-SiC (001) substrates.pdf
file_size: 665964
relation: main_file
success: 1
file_date_updated: 2018-08-27T12:35:32Z
has_accepted_license: '1'
intvolume: ' 323'
issue: '1'
language:
- iso: eng
page: 84-87
publication: Journal of Crystal Growth
publication_identifier:
issn:
- 0022-0248
publication_status: published
publisher: Elsevier BV
status: public
title: Growth of cubic GaN on nano-patterned 3C-SiC/Si (001) substrates
type: journal_article
user_id: '55706'
volume: 323
year: '2010'
...
---
_id: '4153'
abstract:
- lang: eng
text: Nanosphere lithography (NSL) masks consisting of mono- or double-layers of
polystyrene (PS) nano-beads are fabricated on silicon exploiting the self-organization
of PS particles during the controlled drying of a colloidal suspension on a surface.
The shape changes and shrinkage of PS sphere masks upon treatment in an air plasma
are studied as a function of initial sphere size, plasma power and treatment time.
The influence of several experimental parameters, including the plasma induced
temperature rise, are analysed using scanning and transmission electron microscopy.
It is demonstrated that a variety of new intriguing nanopatterns can be generated
on silicon surfaces by the combination of NSL and plasma techniques, largely broadening
the variety of patterns available so far by NSL.
article_type: original
author:
- first_name: D.
full_name: Gogel, D.
last_name: Gogel
- first_name: M.
full_name: Weinl, M.
last_name: Weinl
- first_name: Jörg
full_name: Lindner, Jörg
id: '20797'
last_name: Lindner
- first_name: B.
full_name: Stritzker, B.
last_name: Stritzker
citation:
ama: Gogel D, Weinl M, Lindner J, Stritzker B. Plasma modification of nanosphere
lithography masks made of polystyrene beads. JOURNAL OF OPTOELECTRONICS AND
ADVANCED MATERIALS. 2010;12(3):740-744.
apa: Gogel, D., Weinl, M., Lindner, J., & Stritzker, B. (2010). Plasma modification
of nanosphere lithography masks made of polystyrene beads. JOURNAL OF OPTOELECTRONICS
AND ADVANCED MATERIALS, 12(3), 740–744.
bibtex: '@article{Gogel_Weinl_Lindner_Stritzker_2010, title={Plasma modification
of nanosphere lithography masks made of polystyrene beads}, volume={12}, number={3},
journal={JOURNAL OF OPTOELECTRONICS AND ADVANCED MATERIALS}, author={Gogel, D.
and Weinl, M. and Lindner, Jörg and Stritzker, B.}, year={2010}, pages={740–744}
}'
chicago: 'Gogel, D., M. Weinl, Jörg Lindner, and B. Stritzker. “Plasma Modification
of Nanosphere Lithography Masks Made of Polystyrene Beads.” JOURNAL OF OPTOELECTRONICS
AND ADVANCED MATERIALS 12, no. 3 (2010): 740–44.'
ieee: D. Gogel, M. Weinl, J. Lindner, and B. Stritzker, “Plasma modification of
nanosphere lithography masks made of polystyrene beads,” JOURNAL OF OPTOELECTRONICS
AND ADVANCED MATERIALS, vol. 12, no. 3, pp. 740–744, 2010.
mla: Gogel, D., et al. “Plasma Modification of Nanosphere Lithography Masks Made
of Polystyrene Beads.” JOURNAL OF OPTOELECTRONICS AND ADVANCED MATERIALS,
vol. 12, no. 3, 2010, pp. 740–44.
short: D. Gogel, M. Weinl, J. Lindner, B. Stritzker, JOURNAL OF OPTOELECTRONICS
AND ADVANCED MATERIALS 12 (2010) 740–744.
date_created: 2018-08-27T13:29:28Z
date_updated: 2022-01-06T07:00:26Z
department:
- _id: '286'
- _id: '230'
intvolume: ' 12'
issue: '3'
language:
- iso: eng
page: 740-744
publication: JOURNAL OF OPTOELECTRONICS AND ADVANCED MATERIALS
status: public
title: Plasma modification of nanosphere lithography masks made of polystyrene beads
type: journal_article
user_id: '55706'
volume: 12
year: '2010'
...
---
_id: '4154'
author:
- first_name: Burkhard
full_name: Hehenkamp, Burkhard
id: '37339'
last_name: Hehenkamp
- first_name: Alex
full_name: Possajennikov, Alex
last_name: Possajennikov
- first_name: Tobias
full_name: Guse, Tobias
last_name: Guse
citation:
ama: Hehenkamp B, Possajennikov A, Guse T. On the equivalence of Nash and evolutionary
equilibrium in finite populations. Journal of Economic Behavior & Organization.
2010;73(2):254-258. doi:10.1016/j.jebo.2009.08.011
apa: Hehenkamp, B., Possajennikov, A., & Guse, T. (2010). On the equivalence
of Nash and evolutionary equilibrium in finite populations. Journal of Economic
Behavior & Organization, 73(2), 254–258. https://doi.org/10.1016/j.jebo.2009.08.011
bibtex: '@article{Hehenkamp_Possajennikov_Guse_2010, title={On the equivalence of
Nash and evolutionary equilibrium in finite populations}, volume={73}, DOI={10.1016/j.jebo.2009.08.011},
number={2}, journal={Journal of Economic Behavior & Organization}, publisher={Elsevier
BV}, author={Hehenkamp, Burkhard and Possajennikov, Alex and Guse, Tobias}, year={2010},
pages={254–258} }'
chicago: 'Hehenkamp, Burkhard, Alex Possajennikov, and Tobias Guse. “On the Equivalence
of Nash and Evolutionary Equilibrium in Finite Populations.” Journal of Economic
Behavior & Organization 73, no. 2 (2010): 254–58. https://doi.org/10.1016/j.jebo.2009.08.011.'
ieee: B. Hehenkamp, A. Possajennikov, and T. Guse, “On the equivalence of Nash and
evolutionary equilibrium in finite populations,” Journal of Economic Behavior
& Organization, vol. 73, no. 2, pp. 254–258, 2010.
mla: Hehenkamp, Burkhard, et al. “On the Equivalence of Nash and Evolutionary Equilibrium
in Finite Populations.” Journal of Economic Behavior & Organization,
vol. 73, no. 2, Elsevier BV, 2010, pp. 254–58, doi:10.1016/j.jebo.2009.08.011.
short: B. Hehenkamp, A. Possajennikov, T. Guse, Journal of Economic Behavior &
Organization 73 (2010) 254–258.
date_created: 2018-08-27T14:46:59Z
date_updated: 2022-01-06T07:00:26Z
department:
- _id: '280'
- _id: '475'
doi: 10.1016/j.jebo.2009.08.011
extern: '1'
intvolume: ' 73'
issue: '2'
language:
- iso: eng
page: 254-258
publication: Journal of Economic Behavior & Organization
publication_identifier:
issn:
- 0167-2681
publication_status: published
publisher: Elsevier BV
status: public
title: On the equivalence of Nash and evolutionary equilibrium in finite populations
type: journal_article
user_id: '37339'
volume: 73
year: '2010'
...
---
_id: '4155'
author:
- first_name: Julia
full_name: Angerhausen, Julia
last_name: Angerhausen
- first_name: Christian
full_name: Bayer, Christian
last_name: Bayer
- first_name: Burkhard
full_name: Hehenkamp, Burkhard
last_name: Hehenkamp
citation:
ama: Angerhausen J, Bayer C, Hehenkamp B. Strategic Unemployment. Journal of
Institutional and Theoretical Economics (JITE). 2010;166(3):439-461.
apa: Angerhausen, J., Bayer, C., & Hehenkamp, B. (2010). Strategic Unemployment.
Journal of Institutional and Theoretical Economics (JITE), 166(3),
439–461.
bibtex: '@article{Angerhausen_Bayer_Hehenkamp_2010, title={Strategic Unemployment},
volume={166}, number={3}, journal={Journal of Institutional and Theoretical Economics
(JITE)}, publisher={Mohr Siebeck}, author={Angerhausen, Julia and Bayer, Christian
and Hehenkamp, Burkhard}, year={2010}, pages={439–461} }'
chicago: 'Angerhausen, Julia, Christian Bayer, and Burkhard Hehenkamp. “Strategic
Unemployment.” Journal of Institutional and Theoretical Economics (JITE)
166, no. 3 (2010): 439–61.'
ieee: J. Angerhausen, C. Bayer, and B. Hehenkamp, “Strategic Unemployment,” Journal
of Institutional and Theoretical Economics (JITE), vol. 166, no. 3, pp. 439–461,
2010.
mla: Angerhausen, Julia, et al. “Strategic Unemployment.” Journal of Institutional
and Theoretical Economics (JITE), vol. 166, no. 3, Mohr Siebeck, 2010, pp.
439–61.
short: J. Angerhausen, C. Bayer, B. Hehenkamp, Journal of Institutional and Theoretical
Economics (JITE) 166 (2010) 439–461.
date_created: 2018-08-27T14:58:21Z
date_updated: 2022-01-06T07:00:26Z
department:
- _id: '280'
- _id: '475'
extern: '1'
intvolume: ' 166'
issue: '3'
page: 439-461
publication: Journal of Institutional and Theoretical Economics (JITE)
publisher: Mohr Siebeck
status: public
title: Strategic Unemployment
type: journal_article
user_id: '37339'
volume: 166
year: '2010'
...
---
_id: '4174'
abstract:
- lang: eng
text: "A quantum dot molecule doped with a single electron in the presence of diagonal
and off-diagonal carrierphonon\r\ncouplings is studied by means of a nonperturbative
quantum kinetic theory. The interaction with acoustic phonons by deformation potential
and piezoelectric coupling is taken into account. We show that the phonon-mediated
relaxation is fast on a picosecond time scale and is dominated by the usually
neglected off-diagonal coupling to the lattice degrees of freedom leading to phonon-assisted
electron tunneling. We show that in the parameter regime of current electrical
and optical experiments, the microscopic non-Markovian theory has to be employed."
article_number: '115305'
article_type: original
author:
- first_name: A.
full_name: Grodecka-Grad, A.
last_name: Grodecka-Grad
- first_name: Jens
full_name: Förstner, Jens
id: '158'
last_name: Förstner
orcid: 0000-0001-7059-9862
citation:
ama: Grodecka-Grad A, Förstner J. Theory of phonon-mediated relaxation in doped
quantum dot molecules. Physical Review B. 2010;81(11). doi:10.1103/physrevb.81.115305
apa: Grodecka-Grad, A., & Förstner, J. (2010). Theory of phonon-mediated relaxation
in doped quantum dot molecules. Physical Review B, 81(11). https://doi.org/10.1103/physrevb.81.115305
bibtex: '@article{Grodecka-Grad_Förstner_2010, title={Theory of phonon-mediated
relaxation in doped quantum dot molecules}, volume={81}, DOI={10.1103/physrevb.81.115305},
number={11115305}, journal={Physical Review B}, publisher={American Physical Society
(APS)}, author={Grodecka-Grad, A. and Förstner, Jens}, year={2010} }'
chicago: Grodecka-Grad, A., and Jens Förstner. “Theory of Phonon-Mediated Relaxation
in Doped Quantum Dot Molecules.” Physical Review B 81, no. 11 (2010). https://doi.org/10.1103/physrevb.81.115305.
ieee: A. Grodecka-Grad and J. Förstner, “Theory of phonon-mediated relaxation in
doped quantum dot molecules,” Physical Review B, vol. 81, no. 11, 2010.
mla: Grodecka-Grad, A., and Jens Förstner. “Theory of Phonon-Mediated Relaxation
in Doped Quantum Dot Molecules.” Physical Review B, vol. 81, no. 11, 115305,
American Physical Society (APS), 2010, doi:10.1103/physrevb.81.115305.
short: A. Grodecka-Grad, J. Förstner, Physical Review B 81 (2010).
date_created: 2018-08-28T08:57:24Z
date_updated: 2022-01-06T07:00:29Z
ddc:
- '530'
department:
- _id: '15'
doi: 10.1103/physrevb.81.115305
file:
- access_level: open_access
content_type: application/pdf
creator: hclaudia
date_created: 2018-08-28T08:58:21Z
date_updated: 2018-09-04T19:58:41Z
file_id: '4175'
file_name: 2010 Grodecka-Grad,Förstner_Theory of phonon-mediated relaxation in doped
quantum dot molecules.pdf
file_size: 680408
relation: main_file
file_date_updated: 2018-09-04T19:58:41Z
has_accepted_license: '1'
intvolume: ' 81'
issue: '11'
keyword:
- tet_topic_qd
language:
- iso: eng
oa: '1'
publication: Physical Review B
publication_identifier:
issn:
- 1098-0121
- 1550-235X
publication_status: published
publisher: American Physical Society (APS)
status: public
title: Theory of phonon-mediated relaxation in doped quantum dot molecules
type: journal_article
urn: '41740'
user_id: '158'
volume: 81
year: '2010'
...
---
_id: '4194'
abstract:
- lang: eng
text: A heterojunction field-effect transistor (HFET) was fabricated of nonpolar
cubic AlGaN/GaN grown on Ar+ implanted 3C–SiC (001) by molecular beam epitaxy.
The device shows a clear field effect at positive bias voltages with V_th=0.6
V. The HFET output characteristics were calculated using ATLAS simulation program.
The electron channel at the cubic AlGaN/GaN interface was detected by room temperature
capacitance-voltage measurements.
article_number: '253501'
article_type: original
author:
- first_name: E.
full_name: Tschumak, E.
last_name: Tschumak
- first_name: R.
full_name: Granzner, R.
last_name: Granzner
- first_name: Jörg
full_name: Lindner, Jörg
id: '20797'
last_name: Lindner
- first_name: F.
full_name: Schwierz, F.
last_name: Schwierz
- first_name: K.
full_name: Lischka, K.
last_name: Lischka
- first_name: H.
full_name: Nagasawa, H.
last_name: Nagasawa
- first_name: M.
full_name: Abe, M.
last_name: Abe
- first_name: Donald
full_name: As, Donald
last_name: As
citation:
ama: Tschumak E, Granzner R, Lindner J, et al. Nonpolar cubic AlGaN/GaN heterojunction
field-effect transistor on Ar+ implanted 3C–SiC (001). Applied Physics Letters.
2010;96(25). doi:10.1063/1.3455066
apa: Tschumak, E., Granzner, R., Lindner, J., Schwierz, F., Lischka, K., Nagasawa,
H., … As, D. (2010). Nonpolar cubic AlGaN/GaN heterojunction field-effect transistor
on Ar+ implanted 3C–SiC (001). Applied Physics Letters, 96(25).
https://doi.org/10.1063/1.3455066
bibtex: '@article{Tschumak_Granzner_Lindner_Schwierz_Lischka_Nagasawa_Abe_As_2010,
title={Nonpolar cubic AlGaN/GaN heterojunction field-effect transistor on Ar+
implanted 3C–SiC (001)}, volume={96}, DOI={10.1063/1.3455066},
number={25253501}, journal={Applied Physics Letters}, publisher={AIP Publishing},
author={Tschumak, E. and Granzner, R. and Lindner, Jörg and Schwierz, F. and Lischka,
K. and Nagasawa, H. and Abe, M. and As, Donald}, year={2010} }'
chicago: Tschumak, E., R. Granzner, Jörg Lindner, F. Schwierz, K. Lischka, H. Nagasawa,
M. Abe, and Donald As. “Nonpolar Cubic AlGaN/GaN Heterojunction Field-Effect Transistor
on Ar+ Implanted 3C–SiC (001).” Applied Physics Letters 96, no. 25 (2010).
https://doi.org/10.1063/1.3455066.
ieee: E. Tschumak et al., “Nonpolar cubic AlGaN/GaN heterojunction field-effect
transistor on Ar+ implanted 3C–SiC (001),” Applied Physics Letters, vol.
96, no. 25, 2010.
mla: Tschumak, E., et al. “Nonpolar Cubic AlGaN/GaN Heterojunction Field-Effect
Transistor on Ar+ Implanted 3C–SiC (001).” Applied Physics Letters, vol.
96, no. 25, 253501, AIP Publishing, 2010, doi:10.1063/1.3455066.
short: E. Tschumak, R. Granzner, J. Lindner, F. Schwierz, K. Lischka, H. Nagasawa,
M. Abe, D. As, Applied Physics Letters 96 (2010).
date_created: 2018-08-28T11:56:08Z
date_updated: 2022-01-06T07:00:33Z
ddc:
- '530'
department:
- _id: '15'
- _id: '286'
doi: 10.1063/1.3455066
file:
- access_level: closed
content_type: application/pdf
creator: hclaudia
date_created: 2018-08-28T11:58:27Z
date_updated: 2018-08-28T11:58:27Z
file_id: '4195'
file_name: Non-polar cubic AlGaN-GaN HFET on Ar+ implanted 3C-SiC 001.pdf
file_size: 277385
relation: main_file
success: 1
file_date_updated: 2018-08-28T11:58:27Z
has_accepted_license: '1'
intvolume: ' 96'
issue: '25'
language:
- iso: eng
publication: Applied Physics Letters
publication_identifier:
issn:
- 0003-6951
- 1077-3118
publication_status: published
publisher: AIP Publishing
status: public
title: Nonpolar cubic AlGaN/GaN heterojunction field-effect transistor on Ar+ implanted
3C–SiC (001)
type: journal_article
user_id: '55706'
volume: 96
year: '2010'
...
---
_id: '4200'
abstract:
- lang: eng
text: "We studied the Fulde-Ferrell-Larkin-Ovchinnikov-type state established due
to the proximity effect in superconducting\r\nNb/Cu_41Ni_59 bilayers. Using a
special wedge-type deposition technique, series of 20–35\r\nsamples could be fabricated
by magnetron sputtering during one run. The layer thickness of only a few\r\nnanometers,
the composition of the alloy, and the quality of interfaces were controlled by
Rutherford backscattering\r\nspectrometry, high-resolution transmission electron
microscopy, and Auger spectroscopy. The magnetic\r\nproperties of the ferromagnetic
alloy layer were characterized with superconducting quantum interference\r\ndevice
magnetometry. These studies yield precise information about the thickness and
demonstrate the homogeneity\r\nof the alloy composition and magnetic properties
along the sample series. The dependencies of the\r\ncritical temperature on the
Nb and Cu41Ni59 layer thickness, T_c(d_S) and T_c(d_F), were investigated for
constant\r\nthickness d_F of the magnetic alloy layer and d_S of the superconducting
layer, respectively. All types of\r\nnonmonotonic behaviors of T_c versus d_F
predicted by the theory could be realized experimentally, from\r\nreentrant superconducting
behavior with a broad extinction region to a slight suppression of superconductivity\r\nwith
a shallow minimum. Even a double extinction of superconductivity was observed,
giving evidence for the\r\nmultiple reentrant behavior predicted by theory. All
critical temperature curves were fitted with suitable sets of\r\nparameters. Then,
T_c(d_F) diagrams of a hypothetical ferromagnet/superconductor/ferromagnet spin-switch
core\r\nstructure were calculated using these parameters. Finally, superconducting
spin-switch fabrication issues are\r\ndiscussed in detail in view of the achieved
results."
article_number: '054517'
article_type: original
author:
- first_name: V. I.
full_name: Zdravkov, V. I.
last_name: Zdravkov
- first_name: J.
full_name: Kehrle, J.
last_name: Kehrle
- first_name: G.
full_name: Obermeier, G.
last_name: Obermeier
- first_name: S.
full_name: Gsell, S.
last_name: Gsell
- first_name: M.
full_name: Schreck, M.
last_name: Schreck
- first_name: C.
full_name: Müller, C.
last_name: Müller
- first_name: H.-A.
full_name: Krug von Nidda, H.-A.
last_name: Krug von Nidda
- first_name: Jörg
full_name: Lindner, Jörg
id: '20797'
last_name: Lindner
- first_name: J.
full_name: Moosburger-Will, J.
last_name: Moosburger-Will
- first_name: E.
full_name: Nold, E.
last_name: Nold
- first_name: R.
full_name: Morari, R.
last_name: Morari
- first_name: V. V.
full_name: Ryazanov, V. V.
last_name: Ryazanov
- first_name: A. S.
full_name: Sidorenko, A. S.
last_name: Sidorenko
- first_name: S.
full_name: Horn, S.
last_name: Horn
- first_name: R.
full_name: Tidecks, R.
last_name: Tidecks
- first_name: L. R.
full_name: Tagirov, L. R.
last_name: Tagirov
citation:
ama: Zdravkov VI, Kehrle J, Obermeier G, et al. Reentrant superconductivity in superconductor/ferromagnetic-alloy
bilayers. Physical Review B. 2010;82(5). doi:10.1103/physrevb.82.054517
apa: Zdravkov, V. I., Kehrle, J., Obermeier, G., Gsell, S., Schreck, M., Müller,
C., … Tagirov, L. R. (2010). Reentrant superconductivity in superconductor/ferromagnetic-alloy
bilayers. Physical Review B, 82(5). https://doi.org/10.1103/physrevb.82.054517
bibtex: '@article{Zdravkov_Kehrle_Obermeier_Gsell_Schreck_Müller_Krug von Nidda_Lindner_Moosburger-Will_Nold_et
al._2010, title={Reentrant superconductivity in superconductor/ferromagnetic-alloy
bilayers}, volume={82}, DOI={10.1103/physrevb.82.054517},
number={5054517}, journal={Physical Review B}, publisher={American Physical Society
(APS)}, author={Zdravkov, V. I. and Kehrle, J. and Obermeier, G. and Gsell, S.
and Schreck, M. and Müller, C. and Krug von Nidda, H.-A. and Lindner, Jörg and
Moosburger-Will, J. and Nold, E. and et al.}, year={2010} }'
chicago: Zdravkov, V. I., J. Kehrle, G. Obermeier, S. Gsell, M. Schreck, C. Müller,
H.-A. Krug von Nidda, et al. “Reentrant Superconductivity in Superconductor/Ferromagnetic-Alloy
Bilayers.” Physical Review B 82, no. 5 (2010). https://doi.org/10.1103/physrevb.82.054517.
ieee: V. I. Zdravkov et al., “Reentrant superconductivity in superconductor/ferromagnetic-alloy
bilayers,” Physical Review B, vol. 82, no. 5, 2010.
mla: Zdravkov, V. I., et al. “Reentrant Superconductivity in Superconductor/Ferromagnetic-Alloy
Bilayers.” Physical Review B, vol. 82, no. 5, 054517, American Physical
Society (APS), 2010, doi:10.1103/physrevb.82.054517.
short: V.I. Zdravkov, J. Kehrle, G. Obermeier, S. Gsell, M. Schreck, C. Müller,
H.-A. Krug von Nidda, J. Lindner, J. Moosburger-Will, E. Nold, R. Morari, V.V.
Ryazanov, A.S. Sidorenko, S. Horn, R. Tidecks, L.R. Tagirov, Physical Review B
82 (2010).
date_created: 2018-08-28T12:22:11Z
date_updated: 2022-01-06T07:00:34Z
ddc:
- '530'
department:
- _id: '15'
doi: 10.1103/physrevb.82.054517
extern: '1'
file:
- access_level: closed
content_type: application/pdf
creator: hclaudia
date_created: 2018-08-28T12:23:29Z
date_updated: 2018-08-28T12:23:29Z
file_id: '4201'
file_name: Reentrant superconductivity in superconductor-ferromagnetic-alloy bilayers.pdf
file_size: 723266
relation: main_file
success: 1
file_date_updated: 2018-08-28T12:23:29Z
has_accepted_license: '1'
intvolume: ' 82'
issue: '5'
language:
- iso: eng
publication: Physical Review B
publication_identifier:
issn:
- 1098-0121
- 1550-235X
publication_status: published
publisher: American Physical Society (APS)
status: public
title: Reentrant superconductivity in superconductor/ferromagnetic-alloy bilayers
type: journal_article
user_id: '55706'
volume: 82
year: '2010'
...
---
_id: '4202'
abstract:
- lang: eng
text: "Unintentional doping in nonpolar a-plane \x01112¯0\x02 gallium nitride \x01GaN\x02
grown on r-plane \x0111¯02\x02\r\nsapphire using a three-dimensional \x013D\x02–two-dimensional
\x012D\x02 growth method has been\r\ncharacterized. For both 2D only and 3D–2D
growth, the presence of an unintentionally doped region\r\nadjacent to the GaN/sapphire
interface is observed by scanning capacitance microscopy \x01SCM\x02. The\r\naverage
width of this unintentionally doped layer is found to increase with increasing
3D growth\r\ntime. By using an intentionally doped GaN:Si staircase structure
for calibration, it is shown that the\r\nunintentionally doped region has an average
carrier concentration of \x012.5\x010.3\x02\x021018 cm−3. SCM\r\nalso reveals
the presence of unintentionally doped features extending at 60° from the GaN/sapphire\r\ninterface.
The observation of decreasing carrier concentration with distance from the GaN/sapphire\r\ninterface
along these features may suggest that the unintentional doping arises from oxygen\r\ndiffusion
from the sapphire substrate. Low temperature cathodoluminescence spectra reveal\r\nemission
peaks at 3.41 and 3.30 eV, which are believed to originate from basal plane stacking
faults\r\n\x01BSFs\x02 and prismatic stacking faults \x01PSFs\x02, respectively.
It is shown that the inclined features\r\nextending from the GaN/sapphire interface
exhibit both enhanced BSF and PSF emission. We\r\nsuggest that enhanced unintentional
doping occurs in regions around PSFs. Where BSFs intersect\r\nthis doped material
their emission is also enhanced due to reduced nonradiative recombination.\r\nTransmission
electron microscopy confirms the presence of PSFs extending through the film at
60°\r\nfrom the GaN/sapphire interface."
article_number: '023503'
article_type: original
author:
- first_name: Tongtong
full_name: Zhu, Tongtong
last_name: Zhu
- first_name: Carol F.
full_name: Johnston, Carol F.
last_name: Johnston
- first_name: Maik
full_name: Häberlen, Maik
last_name: Häberlen
- first_name: Menno J.
full_name: Kappers, Menno J.
last_name: Kappers
- first_name: Rachel A.
full_name: Oliver, Rachel A.
last_name: Oliver
citation:
ama: Zhu T, Johnston CF, Häberlen M, Kappers MJ, Oliver RA. Characterization of
unintentional doping in nonpolar GaN. Journal of Applied Physics. 2010;107(2).
doi:10.1063/1.3284944
apa: Zhu, T., Johnston, C. F., Häberlen, M., Kappers, M. J., & Oliver, R. A.
(2010). Characterization of unintentional doping in nonpolar GaN. Journal of
Applied Physics, 107(2). https://doi.org/10.1063/1.3284944
bibtex: '@article{Zhu_Johnston_Häberlen_Kappers_Oliver_2010, title={Characterization
of unintentional doping in nonpolar GaN}, volume={107}, DOI={10.1063/1.3284944},
number={2023503}, journal={Journal of Applied Physics}, publisher={AIP Publishing},
author={Zhu, Tongtong and Johnston, Carol F. and Häberlen, Maik and Kappers, Menno
J. and Oliver, Rachel A.}, year={2010} }'
chicago: Zhu, Tongtong, Carol F. Johnston, Maik Häberlen, Menno J. Kappers, and
Rachel A. Oliver. “Characterization of Unintentional Doping in Nonpolar GaN.”
Journal of Applied Physics 107, no. 2 (2010). https://doi.org/10.1063/1.3284944.
ieee: T. Zhu, C. F. Johnston, M. Häberlen, M. J. Kappers, and R. A. Oliver, “Characterization
of unintentional doping in nonpolar GaN,” Journal of Applied Physics, vol.
107, no. 2, 2010.
mla: Zhu, Tongtong, et al. “Characterization of Unintentional Doping in Nonpolar
GaN.” Journal of Applied Physics, vol. 107, no. 2, 023503, AIP Publishing,
2010, doi:10.1063/1.3284944.
short: T. Zhu, C.F. Johnston, M. Häberlen, M.J. Kappers, R.A. Oliver, Journal of
Applied Physics 107 (2010).
date_created: 2018-08-28T12:27:34Z
date_updated: 2022-01-06T07:00:34Z
ddc:
- '530'
department:
- _id: '15'
doi: 10.1063/1.3284944
extern: '1'
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publication: Journal of Applied Physics
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title: Characterization of unintentional doping in nonpolar GaN
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...