---
_id: '4542'
abstract:
- lang: eng
text: "Weighted automata are finite automata with numerical weights on transitions.
Nondeterministic weighted automata define quantitative languages L that assign
to each word w a real number L(w) computed as the maximal value of all runs over
w, and the value of a run r is a function of the sequence of weights that appear
along r. There are several natural functions to consider such as Sup, LimSup,
LimInf, limit average, and discounted sum of transition weights.\r\nWe introduce
alternating weighted automata in which the transitions of the runs are chosen
by two players in a turn-based fashion. Each word is assigned the maximal value
of a run that the first player can enforce regardless of the choices made by the
second player. We survey the results about closure properties, expressiveness,
and decision problems for nondeterministic weighted automata, and we extend these
results to alternating weighted automata.\r\nFor quantitative languages L 1 and
L 2, we consider the pointwise operations max(L 1,L 2), min(L 1,L 2), 1 − L 1,
and the sum L 1 + L 2. We establish the closure properties of all classes of alternating
weighted automata with respect to these four operations.\r\nWe next compare the
expressive power of the various classes of alternating and nondeterministic weighted
automata over infinite words. In particular, for limit average and discounted
sum, we show that alternation brings more expressive power than nondeterminism.\r\nFinally,
we present decidability results and open questions for the quantitative extension
of the classical decision problems in automata theory: emptiness, universality,
language inclusion, and language equivalence."
acknowledgement: This research was supported in part by the Swiss National Science
Foundation under the Indo-Swiss Joint Research Programme, by the European Network
of Excellence on Embedded Systems Design (ArtistDesign), by the European Combest,
Quasimodo, and Gasics projects, by the PAI program Moves funded by the Belgian Federal
Government, and by the CFV (Federated Center in Verification) funded by the F.R.S.-FNRS.
alternative_title:
- LNCS
author:
- first_name: Krishnendu
full_name: Chatterjee, Krishnendu
id: 2E5DCA20-F248-11E8-B48F-1D18A9856A87
last_name: Chatterjee
orcid: 0000-0002-4561-241X
- first_name: Laurent
full_name: Doyen, Laurent
last_name: Doyen
- first_name: Thomas A
full_name: Henzinger, Thomas A
id: 40876CD8-F248-11E8-B48F-1D18A9856A87
last_name: Henzinger
orcid: 0000−0002−2985−7724
citation:
ama: 'Chatterjee K, Doyen L, Henzinger TA. Alternating weighted automata. In: Vol
5699. Springer; 2009:3-13. doi:10.1007/978-3-642-03409-1_2'
apa: 'Chatterjee, K., Doyen, L., & Henzinger, T. A. (2009). Alternating weighted
automata (Vol. 5699, pp. 3–13). Presented at the FCT: Fundamentals of Computation
Theory, Wroclaw, Poland: Springer. https://doi.org/10.1007/978-3-642-03409-1_2'
chicago: Chatterjee, Krishnendu, Laurent Doyen, and Thomas A Henzinger. “Alternating
Weighted Automata,” 5699:3–13. Springer, 2009. https://doi.org/10.1007/978-3-642-03409-1_2.
ieee: 'K. Chatterjee, L. Doyen, and T. A. Henzinger, “Alternating weighted automata,”
presented at the FCT: Fundamentals of Computation Theory, Wroclaw, Poland, 2009,
vol. 5699, pp. 3–13.'
ista: 'Chatterjee K, Doyen L, Henzinger TA. 2009. Alternating weighted automata.
FCT: Fundamentals of Computation Theory, LNCS, vol. 5699, 3–13.'
mla: Chatterjee, Krishnendu, et al. Alternating Weighted Automata. Vol. 5699,
Springer, 2009, pp. 3–13, doi:10.1007/978-3-642-03409-1_2.
short: K. Chatterjee, L. Doyen, T.A. Henzinger, in:, Springer, 2009, pp. 3–13.
conference:
end_date: 2009-09-04
location: Wroclaw, Poland
name: 'FCT: Fundamentals of Computation Theory'
start_date: 2009-09-02
date_created: 2018-12-11T12:09:23Z
date_published: 2009-09-10T00:00:00Z
date_updated: 2021-01-12T07:59:34Z
day: '10'
ddc:
- '004'
department:
- _id: KrCh
doi: 10.1007/978-3-642-03409-1_2
ec_funded: 1
file:
- access_level: open_access
checksum: e8f53abb63579de3f2bff58b2a1188e2
content_type: application/pdf
creator: system
date_created: 2018-12-12T10:15:09Z
date_updated: 2020-07-14T12:46:31Z
file_id: '5126'
file_name: IST-2012-39-v1+1_Alternating_Weighted_Automata.pdf
file_size: 164428
relation: main_file
file_date_updated: 2020-07-14T12:46:31Z
has_accepted_license: '1'
intvolume: ' 5699'
language:
- iso: eng
month: '09'
oa: 1
oa_version: Submitted Version
page: 3 - 13
project:
- _id: 25F1337C-B435-11E9-9278-68D0E5697425
call_identifier: FP7
grant_number: '214373'
name: Design for Embedded Systems
- _id: 25EFB36C-B435-11E9-9278-68D0E5697425
call_identifier: FP7
grant_number: '215543'
name: COMponent-Based Embedded Systems design Techniques
publication_status: published
publisher: Springer
publist_id: '180'
pubrep_id: '39'
quality_controlled: '1'
scopus_import: 1
status: public
title: Alternating weighted automata
type: conference
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 5699
year: '2009'
...
---
_id: '4543'
abstract:
- lang: eng
text: The synthesis of a reactive system with respect to all omega-regular specification
requires the solution of a graph game. Such games have been extended in two natural
ways. First, a game graph can be equipped with probabilistic choices between alternative
transitions, thus allowing the, modeling of uncertain behaviour. These are called
stochastic games. Second, a liveness specification can he strengthened to require
satisfaction within all unknown but bounded amount of time. These are called finitary
objectives. We study. for the first time, the, combination of Stochastic games
and finitary objectives. We characterize the requirements on optimal strategies
and provide algorithms for Computing the maximal achievable probability of winning
stochastic games with finitary parity or Street, objectives. Most notably the
set of state's from which a player can win with probability . for a finitary parity
objective can he computed in polynomial time even though no polynomial-time algorithm
is known in the nonfinitary case.
acknowledgement: This research was supported in part by the Swiss National Science
Foundation under the Indo-Swiss Joint Research Programme, by the European Network
of Excellence on Embedded Systems Design (ArtistDesign), and by the European project
Combest.
alternative_title:
- LNCS
author:
- first_name: Krishnendu
full_name: Chatterjee, Krishnendu
id: 2E5DCA20-F248-11E8-B48F-1D18A9856A87
last_name: Chatterjee
orcid: 0000-0002-4561-241X
- first_name: Thomas A
full_name: Henzinger, Thomas A
id: 40876CD8-F248-11E8-B48F-1D18A9856A87
last_name: Henzinger
orcid: 0000−0002−2985−7724
- first_name: Florian
full_name: Horn, Florian
id: 37327ACE-F248-11E8-B48F-1D18A9856A87
last_name: Horn
citation:
ama: 'Chatterjee K, Henzinger TA, Horn F. Stochastic games with finitary objectives.
In: Vol 5734. Springer; 2009:34-54. doi:10.1007/978-3-642-03816-7_4'
apa: 'Chatterjee, K., Henzinger, T. A., & Horn, F. (2009). Stochastic games
with finitary objectives (Vol. 5734, pp. 34–54). Presented at the MFCS: Mathematical
Foundations of Computer Science, High Tatras, Slovakia: Springer. https://doi.org/10.1007/978-3-642-03816-7_4'
chicago: Chatterjee, Krishnendu, Thomas A Henzinger, and Florian Horn. “Stochastic
Games with Finitary Objectives,” 5734:34–54. Springer, 2009. https://doi.org/10.1007/978-3-642-03816-7_4.
ieee: 'K. Chatterjee, T. A. Henzinger, and F. Horn, “Stochastic games with finitary
objectives,” presented at the MFCS: Mathematical Foundations of Computer Science,
High Tatras, Slovakia, 2009, vol. 5734, pp. 34–54.'
ista: 'Chatterjee K, Henzinger TA, Horn F. 2009. Stochastic games with finitary
objectives. MFCS: Mathematical Foundations of Computer Science, LNCS, vol. 5734,
34–54.'
mla: Chatterjee, Krishnendu, et al. Stochastic Games with Finitary Objectives.
Vol. 5734, Springer, 2009, pp. 34–54, doi:10.1007/978-3-642-03816-7_4.
short: K. Chatterjee, T.A. Henzinger, F. Horn, in:, Springer, 2009, pp. 34–54.
conference:
end_date: 2009-08-28
location: High Tatras, Slovakia
name: 'MFCS: Mathematical Foundations of Computer Science'
start_date: 2009-08-24
date_created: 2018-12-11T12:09:24Z
date_published: 2009-08-01T00:00:00Z
date_updated: 2021-01-12T07:59:35Z
day: '01'
department:
- _id: KrCh
doi: 10.1007/978-3-642-03816-7_4
ec_funded: 1
intvolume: ' 5734'
language:
- iso: eng
month: '08'
oa_version: None
page: 34 - 54
project:
- _id: 25EFB36C-B435-11E9-9278-68D0E5697425
call_identifier: FP7
grant_number: '215543'
name: COMponent-Based Embedded Systems design Techniques
- _id: 25F1337C-B435-11E9-9278-68D0E5697425
call_identifier: FP7
grant_number: '214373'
name: Design for Embedded Systems
publication_status: published
publisher: Springer
publist_id: '178'
quality_controlled: '1'
scopus_import: 1
status: public
title: Stochastic games with finitary objectives
type: conference
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 5734
year: '2009'
...
---
_id: '4544'
abstract:
- lang: eng
text: We consider concurrent games played on graphs. At every round of a game, each
player simultaneously and independently selects a move; the moves jointly determine
the transition to a successor state. Two basic objectives are the safety objective
to stay forever in a given set of states, and its dual, the reachability objective
to reach a given set of states. We present in this paper a strategy improvement
algorithm for computing the value of a concurrent safety game, that is, the maximal
probability with which player 1 can enforce the safety objective. The algorithm
yields a sequence of player-1 strategies which ensure probabilities of winning
that converge monotonically to the value of the safety game. Our result is significant
because the strategy improvement algorithm provides, for the first time, a way
to approximate the value of a concurrent safety game from below. Since a value
iteration algorithm, or a strategy improvement algorithm for reachability games,
can be used to approximate the same value from above, the combination of both
algorithms yields a method for computing a converging sequence of upper and lower
bounds for the values of concurrent reachability and safety games. Previous methods
could approximate the values of these games only from one direction, and as no
rates of convergence are known, they did not provide a practical way to solve
these games.
author:
- first_name: Krishnendu
full_name: Krishnendu Chatterjee
id: 2E5DCA20-F248-11E8-B48F-1D18A9856A87
last_name: Chatterjee
orcid: 0000-0002-4561-241X
- first_name: Luca
full_name: de Alfaro, Luca
last_name: De Alfaro
- first_name: Thomas A
full_name: Thomas Henzinger
id: 40876CD8-F248-11E8-B48F-1D18A9856A87
last_name: Henzinger
orcid: 0000−0002−2985−7724
citation:
ama: 'Chatterjee K, De Alfaro L, Henzinger TA. Termination criteria for solving
concurrent safety and reachability games. In: SIAM; 2009:197-206. doi:10.1137/1.9781611973068.23'
apa: 'Chatterjee, K., De Alfaro, L., & Henzinger, T. A. (2009). Termination
criteria for solving concurrent safety and reachability games (pp. 197–206). Presented
at the SODA: Symposium on Discrete Algorithms, SIAM. https://doi.org/10.1137/1.9781611973068.23'
chicago: Chatterjee, Krishnendu, Luca De Alfaro, and Thomas A Henzinger. “Termination
Criteria for Solving Concurrent Safety and Reachability Games,” 197–206. SIAM,
2009. https://doi.org/10.1137/1.9781611973068.23.
ieee: 'K. Chatterjee, L. De Alfaro, and T. A. Henzinger, “Termination criteria for
solving concurrent safety and reachability games,” presented at the SODA: Symposium
on Discrete Algorithms, 2009, pp. 197–206.'
ista: 'Chatterjee K, De Alfaro L, Henzinger TA. 2009. Termination criteria for solving
concurrent safety and reachability games. SODA: Symposium on Discrete Algorithms,
197–206.'
mla: Chatterjee, Krishnendu, et al. Termination Criteria for Solving Concurrent
Safety and Reachability Games. SIAM, 2009, pp. 197–206, doi:10.1137/1.9781611973068.23.
short: K. Chatterjee, L. De Alfaro, T.A. Henzinger, in:, SIAM, 2009, pp. 197–206.
conference:
name: 'SODA: Symposium on Discrete Algorithms'
date_created: 2018-12-11T12:09:24Z
date_published: 2009-01-01T00:00:00Z
date_updated: 2021-01-12T07:59:35Z
day: '01'
doi: 10.1137/1.9781611973068.23
extern: 1
file:
- access_level: open_access
checksum: ce7dc1667502e26b23c07a767ac41ae6
content_type: application/pdf
creator: system
date_created: 2018-12-12T10:08:03Z
date_updated: 2020-07-14T12:46:31Z
file_id: '4662'
file_name: IST-2012-37-v1+1_Termination_criteria_for_solving_concurrent_safety_and_reachability_games.pdf
file_size: 212369
relation: main_file
file_date_updated: 2020-07-14T12:46:31Z
main_file_link:
- open_access: '1'
url: https://repository.ist.ac.at/id/eprint/37
month: '01'
oa: 1
page: 197 - 206
publication_status: published
publisher: SIAM
publist_id: '176'
pubrep_id: '37'
quality_controlled: 0
status: public
title: Termination criteria for solving concurrent safety and reachability games
type: conference
year: '2009'
...
---
_id: '4545'
abstract:
- lang: eng
text: 'A stochastic game is a two-player game played oil a graph, where in each
state the successor is chosen either by One of the players, or according to a
probability distribution. We Survey Stochastic games with limsup and liminf objectives.
A real-valued re-ward is assigned to each state, and the value of all infinite
path is the limsup (resp. liminf) of all rewards along the path. The value of
a stochastic game is the maximal expected value of an infinite path that call
he achieved by resolving the decisions of the first player. We present the complexity
of computing values of Stochastic games and their subclasses, and the complexity,
of optimal strategies in such games. '
acknowledgement: This research was supported in part by the Swiss National Science
Foundation under the Indo-Swiss Joint Research Programme, by the European Network
of Excellence on Embedded Systems Design (ArtistDesign), by the European projects
COMBEST, Quasimodo, Gasics, by the PAI program Moves funded by the Belgian Federal
Government, and by the CFV (Federated Center in Verification) funded by the F.R.S.-FNRS.
alternative_title:
- LNCS
author:
- first_name: Krishnendu
full_name: Chatterjee, Krishnendu
id: 2E5DCA20-F248-11E8-B48F-1D18A9856A87
last_name: Chatterjee
orcid: 0000-0002-4561-241X
- first_name: Laurent
full_name: Doyen, Laurent
last_name: Doyen
- first_name: Thomas A
full_name: Henzinger, Thomas A
id: 40876CD8-F248-11E8-B48F-1D18A9856A87
last_name: Henzinger
orcid: 0000−0002−2985−7724
citation:
ama: 'Chatterjee K, Doyen L, Henzinger TA. A survey of stochastic games with limsup
and liminf objectives. In: Vol 5556. Springer; 2009:1-15. doi:10.1007/978-3-642-02930-1_1'
apa: 'Chatterjee, K., Doyen, L., & Henzinger, T. A. (2009). A survey of stochastic
games with limsup and liminf objectives (Vol. 5556, pp. 1–15). Presented at the
ICALP: Automata, Languages and Programming, Rhodos, Greece: Springer. https://doi.org/10.1007/978-3-642-02930-1_1'
chicago: Chatterjee, Krishnendu, Laurent Doyen, and Thomas A Henzinger. “A Survey
of Stochastic Games with Limsup and Liminf Objectives,” 5556:1–15. Springer, 2009.
https://doi.org/10.1007/978-3-642-02930-1_1.
ieee: 'K. Chatterjee, L. Doyen, and T. A. Henzinger, “A survey of stochastic games
with limsup and liminf objectives,” presented at the ICALP: Automata, Languages
and Programming, Rhodos, Greece, 2009, vol. 5556, pp. 1–15.'
ista: 'Chatterjee K, Doyen L, Henzinger TA. 2009. A survey of stochastic games with
limsup and liminf objectives. ICALP: Automata, Languages and Programming, LNCS,
vol. 5556, 1–15.'
mla: Chatterjee, Krishnendu, et al. A Survey of Stochastic Games with Limsup
and Liminf Objectives. Vol. 5556, Springer, 2009, pp. 1–15, doi:10.1007/978-3-642-02930-1_1.
short: K. Chatterjee, L. Doyen, T.A. Henzinger, in:, Springer, 2009, pp. 1–15.
conference:
end_date: 2009-07-12
location: Rhodos, Greece
name: 'ICALP: Automata, Languages and Programming'
start_date: 2009-07-05
date_created: 2018-12-11T12:09:24Z
date_published: 2009-06-24T00:00:00Z
date_updated: 2021-01-12T07:59:35Z
day: '24'
ddc:
- '000'
- '005'
department:
- _id: KrCh
doi: 10.1007/978-3-642-02930-1_1
ec_funded: 1
file:
- access_level: open_access
checksum: dabb6d24428a000254c95493d9c492e6
content_type: application/pdf
creator: system
date_created: 2018-12-12T10:13:11Z
date_updated: 2020-07-14T12:46:31Z
file_id: '4992'
file_name: IST-2012-38-v1+1_A_survey_of_stochastic_games_with_limsup_and_liminf_objectives.pdf
file_size: 187419
relation: main_file
file_date_updated: 2020-07-14T12:46:31Z
has_accepted_license: '1'
intvolume: ' 5556'
language:
- iso: eng
month: '06'
oa: 1
oa_version: Submitted Version
page: 1 - 15
project:
- _id: 25EFB36C-B435-11E9-9278-68D0E5697425
call_identifier: FP7
grant_number: '215543'
name: COMponent-Based Embedded Systems design Techniques
publication_status: published
publisher: Springer
publist_id: '177'
pubrep_id: '38'
quality_controlled: '1'
scopus_import: 1
status: public
title: A survey of stochastic games with limsup and liminf objectives
type: conference
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 5556
year: '2009'
...
---
_id: '4569'
abstract:
- lang: eng
text: "Most specification languages express only qualitative constraints. However,
among two implementations that satisfy a given specification, one may be preferred
to another. For example, if a specification asks that every request is followed
by a response, one may prefer an implementation that generates responses quickly
but does not generate unnecessary responses. We use quantitative properties to
measure the “goodness” of an implementation. Using games with corresponding quantitative
objectives, we can synthesize “optimal” implementations, which are preferred among
the set of possible implementations that satisfy a given specification.\r\nIn
particular, we show how automata with lexicographic mean-payoff conditions can
be used to express many interesting quantitative properties for reactive systems.
In this framework, the synthesis of optimal implementations requires the solution
of lexicographic mean-payoff games (for safety requirements), and the solution
of games with both lexicographic mean-payoff and parity objectives (for liveness
requirements). We present algorithms for solving both kinds of novel graph games."
acknowledgement: This research was supported by the Swiss National Science Foundation
(Indo-Swiss Research Program and NCCR MICS) and the European Union projects COMBEST
and COCONUT.
alternative_title:
- LNCS
arxiv: 1
author:
- first_name: Roderick
full_name: Bloem, Roderick
last_name: Bloem
- first_name: Krishnendu
full_name: Chatterjee, Krishnendu
id: 2E5DCA20-F248-11E8-B48F-1D18A9856A87
last_name: Chatterjee
orcid: 0000-0002-4561-241X
- first_name: Thomas A
full_name: Henzinger, Thomas A
id: 40876CD8-F248-11E8-B48F-1D18A9856A87
last_name: Henzinger
orcid: 0000−0002−2985−7724
- first_name: Barbara
full_name: Jobstmann, Barbara
last_name: Jobstmann
citation:
ama: 'Bloem R, Chatterjee K, Henzinger TA, Jobstmann B. Better quality in synthesis
through quantitative objectives. In: Vol 5643. Springer; 2009:140-156. doi:10.1007/978-3-642-02658-4_14'
apa: 'Bloem, R., Chatterjee, K., Henzinger, T. A., & Jobstmann, B. (2009). Better
quality in synthesis through quantitative objectives (Vol. 5643, pp. 140–156).
Presented at the CAV: Computer Aided Verification, Grenoble, France: Springer.
https://doi.org/10.1007/978-3-642-02658-4_14'
chicago: Bloem, Roderick, Krishnendu Chatterjee, Thomas A Henzinger, and Barbara
Jobstmann. “Better Quality in Synthesis through Quantitative Objectives,” 5643:140–56.
Springer, 2009. https://doi.org/10.1007/978-3-642-02658-4_14.
ieee: 'R. Bloem, K. Chatterjee, T. A. Henzinger, and B. Jobstmann, “Better quality
in synthesis through quantitative objectives,” presented at the CAV: Computer
Aided Verification, Grenoble, France, 2009, vol. 5643, pp. 140–156.'
ista: 'Bloem R, Chatterjee K, Henzinger TA, Jobstmann B. 2009. Better quality in
synthesis through quantitative objectives. CAV: Computer Aided Verification, LNCS,
vol. 5643, 140–156.'
mla: Bloem, Roderick, et al. Better Quality in Synthesis through Quantitative
Objectives. Vol. 5643, Springer, 2009, pp. 140–56, doi:10.1007/978-3-642-02658-4_14.
short: R. Bloem, K. Chatterjee, T.A. Henzinger, B. Jobstmann, in:, Springer, 2009,
pp. 140–156.
conference:
end_date: 2009-07-02
location: Grenoble, France
name: 'CAV: Computer Aided Verification'
start_date: 2009-06-26
date_created: 2018-12-11T12:09:31Z
date_published: 2009-06-19T00:00:00Z
date_updated: 2021-01-12T07:59:46Z
day: '19'
department:
- _id: KrCh
doi: 10.1007/978-3-642-02658-4_14
ec_funded: 1
external_id:
arxiv:
- '0904.2638'
intvolume: ' 5643'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: http://arxiv.org/abs/0904.2638
month: '06'
oa: 1
oa_version: Preprint
page: 140 - 156
project:
- _id: 25EFB36C-B435-11E9-9278-68D0E5697425
call_identifier: FP7
grant_number: '215543'
name: COMponent-Based Embedded Systems design Techniques
publication_status: published
publisher: Springer
publist_id: '141'
quality_controlled: '1'
status: public
title: Better quality in synthesis through quantitative objectives
type: conference
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 5643
year: '2009'
...
---
_id: '4580'
abstract:
- lang: eng
text: Alpaga is a solver for two-player parity games with imperfect information.
Given the description of a game, it determines whether the first player can ensure
to win and, if so, it constructs a winning strategy. The tool provides a symbolic
implementation of a recent algorithm based on antichains.
alternative_title:
- LNCS
author:
- first_name: Dietmar
full_name: Berwanger, Dietmar
last_name: Berwanger
- first_name: Krishnendu
full_name: Krishnendu Chatterjee
id: 2E5DCA20-F248-11E8-B48F-1D18A9856A87
last_name: Chatterjee
orcid: 0000-0002-4561-241X
- first_name: Martin
full_name: De Wulf, Martin
last_name: De Wulf
- first_name: Laurent
full_name: Doyen, Laurent
last_name: Doyen
- first_name: Thomas A
full_name: Thomas Henzinger
id: 40876CD8-F248-11E8-B48F-1D18A9856A87
last_name: Henzinger
orcid: 0000−0002−2985−7724
citation:
ama: 'Berwanger D, Chatterjee K, De Wulf M, Doyen L, Henzinger TA. Alpaga: A tool
for solving parity games with imperfect information. In: Vol 5505. Springer; 2009:58-61.
doi:10.1007/978-3-642-00768-2_7'
apa: 'Berwanger, D., Chatterjee, K., De Wulf, M., Doyen, L., & Henzinger, T.
A. (2009). Alpaga: A tool for solving parity games with imperfect information
(Vol. 5505, pp. 58–61). Presented at the TACAS: Tools and Algorithms for the Construction
and Analysis of Systems, Springer. https://doi.org/10.1007/978-3-642-00768-2_7'
chicago: 'Berwanger, Dietmar, Krishnendu Chatterjee, Martin De Wulf, Laurent Doyen,
and Thomas A Henzinger. “Alpaga: A Tool for Solving Parity Games with Imperfect
Information,” 5505:58–61. Springer, 2009. https://doi.org/10.1007/978-3-642-00768-2_7.'
ieee: 'D. Berwanger, K. Chatterjee, M. De Wulf, L. Doyen, and T. A. Henzinger, “Alpaga:
A tool for solving parity games with imperfect information,” presented at the
TACAS: Tools and Algorithms for the Construction and Analysis of Systems, 2009,
vol. 5505, pp. 58–61.'
ista: 'Berwanger D, Chatterjee K, De Wulf M, Doyen L, Henzinger TA. 2009. Alpaga:
A tool for solving parity games with imperfect information. TACAS: Tools and Algorithms
for the Construction and Analysis of Systems, LNCS, vol. 5505, 58–61.'
mla: 'Berwanger, Dietmar, et al. Alpaga: A Tool for Solving Parity Games with
Imperfect Information. Vol. 5505, Springer, 2009, pp. 58–61, doi:10.1007/978-3-642-00768-2_7.'
short: D. Berwanger, K. Chatterjee, M. De Wulf, L. Doyen, T.A. Henzinger, in:, Springer,
2009, pp. 58–61.
conference:
name: 'TACAS: Tools and Algorithms for the Construction and Analysis of Systems'
date_created: 2018-12-11T12:09:35Z
date_published: 2009-03-09T00:00:00Z
date_updated: 2021-01-12T07:59:52Z
day: '09'
doi: 10.1007/978-3-642-00768-2_7
extern: 1
file:
- access_level: open_access
checksum: d52b55a10a47b3e3b0e016ea9bf85c41
content_type: application/pdf
creator: system
date_created: 2018-12-12T10:15:45Z
date_updated: 2020-07-14T12:46:32Z
file_id: '5168'
file_name: IST-2012-35-v1+1_Alpaga_-_A_tool_for_solving_parity_games_with_imperfect_information.pdf
file_size: 212180
relation: main_file
file_date_updated: 2020-07-14T12:46:32Z
intvolume: ' 5505'
main_file_link:
- open_access: '1'
url: https://repository.ist.ac.at/35/
month: '03'
oa: 1
page: 58 - 61
publication_status: published
publisher: Springer
publist_id: '127'
pubrep_id: '35'
quality_controlled: 0
status: public
title: 'Alpaga: A tool for solving parity games with imperfect information'
type: conference
volume: 5505
year: '2009'
...
---
_id: '12656'
abstract:
- lang: eng
text: We use meteorological data from two automatic weather stations (AWS) on Juncal
Norte Glacier, central Chile, to investigate the glacier–climate interaction and
to test ablation models of different complexity. The semi-arid Central Andes are
characterized by dry summers, with precipitation close to zero, low relative humidity
and intense solar radiation. We show that katabatic forcing is dominant both on
the glacier tongue and in the fore field, and that low humidity and absence of
clouds cause strong radiative cooling of the glacier surface. Surface albedo is
basically constant for snow and ice, because of the scarcity of solid precipitation.
The energy balance of the glacier is simulated for a 2-month period in austral
summer using two models of different complexity, which differ in the inclusion
of the heat conduction flux into the snowpack and in the parameterization of the
incoming longwave radiation. Net shortwave radiation is the dominant component
of the energy balance. The sensible heat flux is always positive, while both the
net longwave radiation and latent heat flux are negative. Neglecting the subsurface
heat flux and corresponding variations in surface temperature leads to an overestimation
of ablation of 2% over a total of 3695 mm water equivalent (w.e.) at the end of
the season. Correct modelling of incoming longwave radiation is crucial, and we
suggest that parameterizations based on vapour pressure and air temperature should
be used rather than on computed cloud amount. We also used an enhanced temperature-index
model incorporating the shortwave radiation flux, which has two empirical parameters.
We apply it both with values of parameters obtained for Alpine glaciers and recalibrated
on Juncal Norte. The model recalibrated against the correct energy balance simulations
performs very well. The model parameters respond to the meteorological conditions
typical of this climatic setting.
article_processing_charge: No
article_type: original
author:
- first_name: Francesca
full_name: Pellicciotti, Francesca
id: b28f055a-81ea-11ed-b70c-a9fe7f7b0e70
last_name: Pellicciotti
- first_name: Jakob
full_name: Helbing, Jakob
last_name: Helbing
- first_name: Andrés
full_name: Rivera, Andrés
last_name: Rivera
- first_name: Vincent
full_name: Favier, Vincent
last_name: Favier
- first_name: Javier
full_name: Corripio, Javier
last_name: Corripio
- first_name: José
full_name: Araos, José
last_name: Araos
- first_name: Jean-Emmanuel
full_name: Sicart, Jean-Emmanuel
last_name: Sicart
- first_name: Marco
full_name: Carenzo, Marco
last_name: Carenzo
citation:
ama: Pellicciotti F, Helbing J, Rivera A, et al. A study of the energy balance and
melt regime on Juncal Norte Glacier, semi-arid Andes of central Chile, using melt
models of different complexity. Hydrological Processes. 2008;22(19):3980-3997.
doi:10.1002/hyp.7085
apa: Pellicciotti, F., Helbing, J., Rivera, A., Favier, V., Corripio, J., Araos,
J., … Carenzo, M. (2008). A study of the energy balance and melt regime on Juncal
Norte Glacier, semi-arid Andes of central Chile, using melt models of different
complexity. Hydrological Processes. Wiley. https://doi.org/10.1002/hyp.7085
chicago: Pellicciotti, Francesca, Jakob Helbing, Andrés Rivera, Vincent Favier,
Javier Corripio, José Araos, Jean-Emmanuel Sicart, and Marco Carenzo. “A Study
of the Energy Balance and Melt Regime on Juncal Norte Glacier, Semi-Arid Andes
of Central Chile, Using Melt Models of Different Complexity.” Hydrological
Processes. Wiley, 2008. https://doi.org/10.1002/hyp.7085.
ieee: F. Pellicciotti et al., “A study of the energy balance and melt regime
on Juncal Norte Glacier, semi-arid Andes of central Chile, using melt models of
different complexity,” Hydrological Processes, vol. 22, no. 19. Wiley,
pp. 3980–3997, 2008.
ista: Pellicciotti F, Helbing J, Rivera A, Favier V, Corripio J, Araos J, Sicart
J-E, Carenzo M. 2008. A study of the energy balance and melt regime on Juncal
Norte Glacier, semi-arid Andes of central Chile, using melt models of different
complexity. Hydrological Processes. 22(19), 3980–3997.
mla: Pellicciotti, Francesca, et al. “A Study of the Energy Balance and Melt Regime
on Juncal Norte Glacier, Semi-Arid Andes of Central Chile, Using Melt Models of
Different Complexity.” Hydrological Processes, vol. 22, no. 19, Wiley,
2008, pp. 3980–97, doi:10.1002/hyp.7085.
short: F. Pellicciotti, J. Helbing, A. Rivera, V. Favier, J. Corripio, J. Araos,
J.-E. Sicart, M. Carenzo, Hydrological Processes 22 (2008) 3980–3997.
date_created: 2023-02-20T08:18:45Z
date_published: 2008-09-15T00:00:00Z
date_updated: 2023-02-20T08:48:33Z
day: '15'
doi: 10.1002/hyp.7085
extern: '1'
intvolume: ' 22'
issue: '19'
keyword:
- Water Science and Technology
language:
- iso: eng
month: '09'
oa_version: None
page: 3980-3997
publication: Hydrological Processes
publication_identifier:
eissn:
- 1099-1085
issn:
- 0885-6087
publication_status: published
publisher: Wiley
quality_controlled: '1'
scopus_import: '1'
status: public
title: A study of the energy balance and melt regime on Juncal Norte Glacier, semi-arid
Andes of central Chile, using melt models of different complexity
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 22
year: '2008'
...
---
_id: '1296'
abstract:
- lang: eng
text: The crystalline-like structure of the optic lobes of the fruit fly Drosophila
melanogaster has made them a model system for the study of neuronal cell-fate
determination, axonal path finding, and target selection. For functional studies,
however, the small size of the constituting visual interneurons has so far presented
a formidable barrier. We have overcome this problem by establishing in vivo whole-cell
recordings [1] from genetically targeted visual interneurons of Drosophila. Here,
we describe the response properties of six motion-sensitive large-field neurons
in the lobula plate that form a network consisting of individually identifiable,
directionally selective cells most sensitive to vertical image motion (VS cells
[2, 3]). Individual VS cell responses to visual motion stimuli exhibit all the
characteristics that are indicative of presynaptic input from elementary motion
detectors of the correlation type [4, 5]. Different VS cells possess distinct
receptive fields that are arranged sequentially along the eye's azimuth, corresponding
to their characteristic cellular morphology and position within the retinotopically
organized lobula plate. In addition, lateral connections between individual VS
cells cause strongly overlapping receptive fields that are wider than expected
from their dendritic input. Our results suggest that motion vision in different
dipteran fly species is accomplished in similar circuitries and according to common
algorithmic rules. The underlying neural mechanisms of population coding within
the VS cell network and of elementary motion detection, respectively, can now
be analyzed by the combination of electrophysiology and genetic intervention in
Drosophila.
acknowledgement: This work was supported by the Max-Planck-Society and by a Human
Frontier Science Program (HFSP) grant to K. Ito, A.B., and B. Nelson.
author:
- first_name: Maximilian A
full_name: Maximilian Jösch
id: 2BD278E6-F248-11E8-B48F-1D18A9856A87
last_name: Jösch
orcid: 0000-0002-3937-1330
- first_name: Johannes
full_name: Plett, Johannes
last_name: Plett
- first_name: Alexander
full_name: Borst, Alexander
last_name: Borst
- first_name: Dierk
full_name: Reiff, Dierk F
last_name: Reiff
citation:
ama: Jösch MA, Plett J, Borst A, Reiff D. Response properties of motion sensitive
visual interneurons in the Lobula plate of Drosophila melanogaster. Current
Biology. 2008;18(5):368-374. doi:10.1016/j.cub.2008.02.022
apa: Jösch, M. A., Plett, J., Borst, A., & Reiff, D. (2008). Response properties
of motion sensitive visual interneurons in the Lobula plate of Drosophila melanogaster.
Current Biology. Cell Press. https://doi.org/10.1016/j.cub.2008.02.022
chicago: Jösch, Maximilian A, Johannes Plett, Alexander Borst, and Dierk Reiff.
“Response Properties of Motion Sensitive Visual Interneurons in the Lobula Plate
of Drosophila Melanogaster.” Current Biology. Cell Press, 2008. https://doi.org/10.1016/j.cub.2008.02.022.
ieee: M. A. Jösch, J. Plett, A. Borst, and D. Reiff, “Response properties of motion
sensitive visual interneurons in the Lobula plate of Drosophila melanogaster,”
Current Biology, vol. 18, no. 5. Cell Press, pp. 368–374, 2008.
ista: Jösch MA, Plett J, Borst A, Reiff D. 2008. Response properties of motion sensitive
visual interneurons in the Lobula plate of Drosophila melanogaster. Current Biology.
18(5), 368–374.
mla: Jösch, Maximilian A., et al. “Response Properties of Motion Sensitive Visual
Interneurons in the Lobula Plate of Drosophila Melanogaster.” Current Biology,
vol. 18, no. 5, Cell Press, 2008, pp. 368–74, doi:10.1016/j.cub.2008.02.022.
short: M.A. Jösch, J. Plett, A. Borst, D. Reiff, Current Biology 18 (2008) 368–374.
date_created: 2018-12-11T11:51:13Z
date_published: 2008-03-11T00:00:00Z
date_updated: 2021-01-12T06:49:42Z
day: '11'
doi: 10.1016/j.cub.2008.02.022
extern: 1
intvolume: ' 18'
issue: '5'
month: '03'
page: 368 - 374
publication: Current Biology
publication_status: published
publisher: Cell Press
publist_id: '5973'
quality_controlled: 0
status: public
title: Response properties of motion sensitive visual interneurons in the Lobula plate
of Drosophila melanogaster
type: journal_article
volume: 18
year: '2008'
...
---
_id: '844'
abstract:
- lang: eng
text: Mutation rate varies greatly between nucleotide sites of the human genome
and depends both on the global genomic location and the local sequence context
of a site. In particular, CpG context elevates the mutation rate by an order of
magnitude. Mutations also vary widely in their effect on the molecular function,
phenotype, and fitness. Independence of the probability of occurrence of a new
mutation's effect has been a fundamental premise in genetics. However, highly
mutable contexts may be preserved by negative selection at important sites but
destroyed by mutation at sites under no selection. Thus, there may be a positive
correlation between the rate of mutations at a nucleotide site and the magnitude
of their effect on fitness. We studied the impact of CpG context on the rate of
human-chimpanzee divergence and on intrahuman nucleotide diversity at non-synonymous
coding sites. We compared nucleotides that occupy identical positions within codons
of identical amino acids and only differ by being within versus outside CpG context.
Nucleotides within CpG context are under a stronger negative selection, as revealed
by their lower, proportionally to the mutation rate, rate of evolution and nucleotide
diversity. In particular, the probability of fixation of a non-synonymous transition
at a CpG site is two times lower than at a CpG site. Thus, sites with different
mutation rates are not necessarily selectively equivalent. This suggests that
the mutation rate may complement sequence conservation as a characteristic predictive
of functional importance of nucleotide sites.
acknowledgement: This work was supported in part by NIH grants R01 GM078598 and U54
LM008748.
author:
- first_name: Steffen
full_name: Schmidt, Steffen
last_name: Schmidt
- first_name: Anna
full_name: Gerasimova, Anna
last_name: Gerasimova
- first_name: Fyodor
full_name: Fyodor Kondrashov
id: 44FDEF62-F248-11E8-B48F-1D18A9856A87
last_name: Kondrashov
orcid: 0000-0001-8243-4694
- first_name: Ivan
full_name: Adzuhbei, Ivan A
last_name: Adzuhbei
- first_name: Alexey
full_name: Kondrashov, Alexey S
last_name: Kondrashov
- first_name: Shamil
full_name: Sunyaev, Shamil R
last_name: Sunyaev
citation:
ama: Schmidt S, Gerasimova A, Kondrashov F, Adzuhbei I, Kondrashov A, Sunyaev S.
Hypermutable non-synonymous sites are under stronger negative selection. PLoS
Genetics. 2008;4(11). doi:10.1371/journal.pgen.1000281
apa: Schmidt, S., Gerasimova, A., Kondrashov, F., Adzuhbei, I., Kondrashov, A.,
& Sunyaev, S. (2008). Hypermutable non-synonymous sites are under stronger
negative selection. PLoS Genetics. Public Library of Science. https://doi.org/10.1371/journal.pgen.1000281
chicago: Schmidt, Steffen, Anna Gerasimova, Fyodor Kondrashov, Ivan Adzuhbei, Alexey
Kondrashov, and Shamil Sunyaev. “Hypermutable Non-Synonymous Sites Are under Stronger
Negative Selection.” PLoS Genetics. Public Library of Science, 2008. https://doi.org/10.1371/journal.pgen.1000281.
ieee: S. Schmidt, A. Gerasimova, F. Kondrashov, I. Adzuhbei, A. Kondrashov, and
S. Sunyaev, “Hypermutable non-synonymous sites are under stronger negative selection,”
PLoS Genetics, vol. 4, no. 11. Public Library of Science, 2008.
ista: Schmidt S, Gerasimova A, Kondrashov F, Adzuhbei I, Kondrashov A, Sunyaev S.
2008. Hypermutable non-synonymous sites are under stronger negative selection.
PLoS Genetics. 4(11).
mla: Schmidt, Steffen, et al. “Hypermutable Non-Synonymous Sites Are under Stronger
Negative Selection.” PLoS Genetics, vol. 4, no. 11, Public Library of Science,
2008, doi:10.1371/journal.pgen.1000281.
short: S. Schmidt, A. Gerasimova, F. Kondrashov, I. Adzuhbei, A. Kondrashov, S.
Sunyaev, PLoS Genetics 4 (2008).
date_created: 2018-12-11T11:48:48Z
date_published: 2008-11-01T00:00:00Z
date_updated: 2021-01-12T08:19:16Z
day: '01'
doi: 10.1371/journal.pgen.1000281
extern: 1
intvolume: ' 4'
issue: '11'
month: '11'
publication: PLoS Genetics
publication_status: published
publisher: Public Library of Science
publist_id: '6800'
quality_controlled: 0
status: public
title: Hypermutable non-synonymous sites are under stronger negative selection
tmp:
image: /images/cc_by.png
legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode
name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)
short: CC BY (4.0)
type: journal_article
volume: 4
year: '2008'
...
---
_id: '8480'
abstract:
- lang: eng
text: The KIX domain of the transcription co-activator CBP is a three-helix bundle
protein that folds via rapid accumulation of an intermediate state, followed by
a slower folding phase. Recent NMR relaxation dispersion studies revealed the
presence of a low-populated (excited) state of KIX that exists in equilibrium
with the natively folded form under non-denaturing conditions, and likely represents
the equilibrium analog of the folding intermediate. Here, we combine amide hydrogen/deuterium
exchange measurements using rapid NMR data acquisition techniques with backbone
15N and 13C relaxation dispersion experiments to further investigate the equilibrium
folding of the KIX domain. Residual structure within the folding intermediate
is detected by both methods, and their combination enables reliable quantification
of the amount of persistent residual structure. Three well-defined folding subunits
are found, which display variable stability and correspond closely to the individual
helices in the native state. While two of the three helices (α2 and α3) are partially
formed in the folding intermediate (to ∼ 50% and ∼ 80%, respectively, at 20 °C),
the third helix is disordered. The observed helical content within the excited
state exceeds the helical propensities predicted for the corresponding peptide
regions, suggesting that the two helices are weakly mutually stabilized, while
methyl 13C relaxation dispersion data indicate that a defined packing arrangement
is unlikely. Temperature-dependent experiments reveal that the largest enthalpy
and entropy changes along the folding reaction occur during the final transition
from the intermediate to the native state. Our experimental data are consistent
with a folding mechanism where helices α2 and α3 form rapidly, although to different
extents, while helix α1 consolidates only as folding proceeds to complete the
native state-structure.
article_processing_charge: No
article_type: original
author:
- first_name: Paul
full_name: Schanda, Paul
id: 7B541462-FAF6-11E9-A490-E8DFE5697425
last_name: Schanda
orcid: 0000-0002-9350-7606
- first_name: Bernhard
full_name: Brutscher, Bernhard
last_name: Brutscher
- first_name: Robert
full_name: Konrat, Robert
last_name: Konrat
- first_name: Martin
full_name: Tollinger, Martin
last_name: Tollinger
citation:
ama: 'Schanda P, Brutscher B, Konrat R, Tollinger M. Folding of the KIX domain:
Characterization of the equilibrium analog of a folding intermediate using 15N/13C
relaxation dispersion and fast 1H/2H amide exchange NMR spectroscopy. Journal
of Molecular Biology. 2008;380(4):726-741. doi:10.1016/j.jmb.2008.05.040'
apa: 'Schanda, P., Brutscher, B., Konrat, R., & Tollinger, M. (2008). Folding
of the KIX domain: Characterization of the equilibrium analog of a folding intermediate
using 15N/13C relaxation dispersion and fast 1H/2H amide exchange NMR spectroscopy.
Journal of Molecular Biology. Elsevier. https://doi.org/10.1016/j.jmb.2008.05.040'
chicago: 'Schanda, Paul, Bernhard Brutscher, Robert Konrat, and Martin Tollinger.
“Folding of the KIX Domain: Characterization of the Equilibrium Analog of a Folding
Intermediate Using 15N/13C Relaxation Dispersion and Fast 1H/2H Amide Exchange
NMR Spectroscopy.” Journal of Molecular Biology. Elsevier, 2008. https://doi.org/10.1016/j.jmb.2008.05.040.'
ieee: 'P. Schanda, B. Brutscher, R. Konrat, and M. Tollinger, “Folding of the KIX
domain: Characterization of the equilibrium analog of a folding intermediate using
15N/13C relaxation dispersion and fast 1H/2H amide exchange NMR spectroscopy,”
Journal of Molecular Biology, vol. 380, no. 4. Elsevier, pp. 726–741, 2008.'
ista: 'Schanda P, Brutscher B, Konrat R, Tollinger M. 2008. Folding of the KIX domain:
Characterization of the equilibrium analog of a folding intermediate using 15N/13C
relaxation dispersion and fast 1H/2H amide exchange NMR spectroscopy. Journal
of Molecular Biology. 380(4), 726–741.'
mla: 'Schanda, Paul, et al. “Folding of the KIX Domain: Characterization of the
Equilibrium Analog of a Folding Intermediate Using 15N/13C Relaxation Dispersion
and Fast 1H/2H Amide Exchange NMR Spectroscopy.” Journal of Molecular Biology,
vol. 380, no. 4, Elsevier, 2008, pp. 726–41, doi:10.1016/j.jmb.2008.05.040.'
short: P. Schanda, B. Brutscher, R. Konrat, M. Tollinger, Journal of Molecular Biology
380 (2008) 726–741.
date_created: 2020-09-18T10:12:29Z
date_published: 2008-07-18T00:00:00Z
date_updated: 2021-01-12T08:19:34Z
day: '18'
doi: 10.1016/j.jmb.2008.05.040
extern: '1'
intvolume: ' 380'
issue: '4'
keyword:
- Molecular Biology
language:
- iso: eng
month: '07'
oa_version: None
page: 726-741
publication: Journal of Molecular Biology
publication_identifier:
issn:
- 0022-2836
publication_status: published
publisher: Elsevier
quality_controlled: '1'
status: public
title: 'Folding of the KIX domain: Characterization of the equilibrium analog of a
folding intermediate using 15N/13C relaxation dispersion and fast 1H/2H amide exchange
NMR spectroscopy'
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 380
year: '2008'
...
---
_id: '8481'
abstract:
- lang: eng
text: 'The copK gene is localized on the pMOL30 plasmid of Cupriavidus metallidurans
CH34 within the complex cop cluster of genes, for which 21 genes have been identified.
The expression of the corresponding periplasmic CopK protein is strongly upregulated
in the presence of copper, leading to a high periplasmic accumulation. The structure
and metal-binding properties of CopK were investigated by NMR and mass spectrometry.
The protein is dimeric in the apo state with a dissociation constant in the range
of 10- 5 M estimated from analytical ultracentrifugation. Mass spectrometry revealed
that CopK has two high-affinity Cu(I)-binding sites per monomer with different
Cu(I) affinities. Binding of Cu(II) was observed but appeared to be non-specific.
The solution structure of apo-CopK revealed an all-β fold formed of two β-sheets
in perpendicular orientation with an unstructured C-terminal tail. The dimer interface
is formed by the surface of the C-terminal β-sheet. Binding of the first Cu(I)-ion
induces a major structural modification involving dissociation of the dimeric
apo-protein. Backbone chemical shifts determined for the 1Cu(I)-bound form confirm
the conservation of the N-terminal β-sheet, while the last strand of the C-terminal
sheet appears in slow conformational exchange. We hypothesize that the partial
disruption of the C-terminal β-sheet is related to dimer dissociation. NH-exchange
data acquired on the apo-protein are consistent with a lower thermodynamic stability
of the C-terminal sheet. CopK contains seven methionine residues, five of which
appear highly conserved. Chemical shift data suggest implication of two or three
methionines (Met54, Met38, Met28) in the first Cu(I) site. Addition of a second
Cu(I) ion further increases protein plasticity. Comparison of the structural and
metal-binding properties of CopK with other periplasmic copper-binding proteins
reveals two conserved features within these functionally related proteins: the
all-β fold and the methionine-rich Cu(I)-binding site.'
article_processing_charge: No
article_type: original
author:
- first_name: Beate
full_name: Bersch, Beate
last_name: Bersch
- first_name: Adrien
full_name: Favier, Adrien
last_name: Favier
- first_name: Paul
full_name: Schanda, Paul
id: 7B541462-FAF6-11E9-A490-E8DFE5697425
last_name: Schanda
orcid: 0000-0002-9350-7606
- first_name: Sébastien
full_name: van Aelst, Sébastien
last_name: van Aelst
- first_name: Tatiana
full_name: Vallaeys, Tatiana
last_name: Vallaeys
- first_name: Jacques
full_name: Covès, Jacques
last_name: Covès
- first_name: Max
full_name: Mergeay, Max
last_name: Mergeay
- first_name: Ruddy
full_name: Wattiez, Ruddy
last_name: Wattiez
citation:
ama: Bersch B, Favier A, Schanda P, et al. Molecular structure and metal-binding
properties of the periplasmic CopK protein expressed in Cupriavidus metallidurans
CH34 during copper challenge. Journal of Molecular Biology. 2008;380(2):386-403.
doi:10.1016/j.jmb.2008.05.017
apa: Bersch, B., Favier, A., Schanda, P., van Aelst, S., Vallaeys, T., Covès, J.,
… Wattiez, R. (2008). Molecular structure and metal-binding properties of the
periplasmic CopK protein expressed in Cupriavidus metallidurans CH34 during copper
challenge. Journal of Molecular Biology. Elsevier. https://doi.org/10.1016/j.jmb.2008.05.017
chicago: Bersch, Beate, Adrien Favier, Paul Schanda, Sébastien van Aelst, Tatiana
Vallaeys, Jacques Covès, Max Mergeay, and Ruddy Wattiez. “Molecular Structure
and Metal-Binding Properties of the Periplasmic CopK Protein Expressed in Cupriavidus
Metallidurans CH34 during Copper Challenge.” Journal of Molecular Biology.
Elsevier, 2008. https://doi.org/10.1016/j.jmb.2008.05.017.
ieee: B. Bersch et al., “Molecular structure and metal-binding properties
of the periplasmic CopK protein expressed in Cupriavidus metallidurans CH34 during
copper challenge,” Journal of Molecular Biology, vol. 380, no. 2. Elsevier,
pp. 386–403, 2008.
ista: Bersch B, Favier A, Schanda P, van Aelst S, Vallaeys T, Covès J, Mergeay M,
Wattiez R. 2008. Molecular structure and metal-binding properties of the periplasmic
CopK protein expressed in Cupriavidus metallidurans CH34 during copper challenge.
Journal of Molecular Biology. 380(2), 386–403.
mla: Bersch, Beate, et al. “Molecular Structure and Metal-Binding Properties of
the Periplasmic CopK Protein Expressed in Cupriavidus Metallidurans CH34 during
Copper Challenge.” Journal of Molecular Biology, vol. 380, no. 2, Elsevier,
2008, pp. 386–403, doi:10.1016/j.jmb.2008.05.017.
short: B. Bersch, A. Favier, P. Schanda, S. van Aelst, T. Vallaeys, J. Covès, M.
Mergeay, R. Wattiez, Journal of Molecular Biology 380 (2008) 386–403.
date_created: 2020-09-18T10:12:37Z
date_published: 2008-07-04T00:00:00Z
date_updated: 2021-01-12T08:19:34Z
day: '04'
doi: 10.1016/j.jmb.2008.05.017
extern: '1'
intvolume: ' 380'
issue: '2'
keyword:
- Molecular Biology
language:
- iso: eng
month: '07'
oa_version: None
page: 386-403
publication: Journal of Molecular Biology
publication_identifier:
issn:
- 0022-2836
publication_status: published
publisher: Elsevier
quality_controlled: '1'
status: public
title: Molecular structure and metal-binding properties of the periplasmic CopK protein
expressed in Cupriavidus metallidurans CH34 during copper challenge
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 380
year: '2008'
...
---
_id: '8482'
abstract:
- lang: eng
text: The SOFAST-HMQC experiment [P. Schanda, B. Brutscher, Very fast two-dimensional
NMR spectroscopy for real-time investigation of dynamic events in proteins on
the time scale of seconds, J. Am. Chem. Soc. 127 (2005) 8014–8015] allows recording
two-dimensional correlation spectra of macromolecules such as proteins in only
a few seconds acquisition time. To achieve the highest possible sensitivity, SOFAST-HMQC
experiments are preferably performed on high-field NMR spectrometers equipped
with cryogenically cooled probes. The duty cycle of over 80% in fast-pulsing SOFAST-HMQC
experiments, however, may cause problems when using a cryogenic probe. Here we
introduce SE-IPAP-SOFAST-HMQC, a new pulse sequence that provides comparable sensitivity
to standard SOFAST-HMQC, while avoiding heteronuclear decoupling during 1H detection,
and thus significantly reducing the radiofrequency load of the probe during the
experiment. The experiment is also attractive for fast and sensitive measurement
of heteronuclear one-bond spin coupling constants.
article_processing_charge: No
article_type: letter_note
author:
- first_name: Thomas
full_name: Kern, Thomas
last_name: Kern
- first_name: Paul
full_name: Schanda, Paul
id: 7B541462-FAF6-11E9-A490-E8DFE5697425
last_name: Schanda
orcid: 0000-0002-9350-7606
- first_name: Bernhard
full_name: Brutscher, Bernhard
last_name: Brutscher
citation:
ama: Kern T, Schanda P, Brutscher B. Sensitivity-enhanced IPAP-SOFAST-HMQC for fast-pulsing
2D NMR with reduced radiofrequency load. Journal of Magnetic Resonance.
2008;190(2):333-338. doi:10.1016/j.jmr.2007.11.015
apa: Kern, T., Schanda, P., & Brutscher, B. (2008). Sensitivity-enhanced IPAP-SOFAST-HMQC
for fast-pulsing 2D NMR with reduced radiofrequency load. Journal of Magnetic
Resonance. Elsevier. https://doi.org/10.1016/j.jmr.2007.11.015
chicago: Kern, Thomas, Paul Schanda, and Bernhard Brutscher. “Sensitivity-Enhanced
IPAP-SOFAST-HMQC for Fast-Pulsing 2D NMR with Reduced Radiofrequency Load.” Journal
of Magnetic Resonance. Elsevier, 2008. https://doi.org/10.1016/j.jmr.2007.11.015.
ieee: T. Kern, P. Schanda, and B. Brutscher, “Sensitivity-enhanced IPAP-SOFAST-HMQC
for fast-pulsing 2D NMR with reduced radiofrequency load,” Journal of Magnetic
Resonance, vol. 190, no. 2. Elsevier, pp. 333–338, 2008.
ista: Kern T, Schanda P, Brutscher B. 2008. Sensitivity-enhanced IPAP-SOFAST-HMQC
for fast-pulsing 2D NMR with reduced radiofrequency load. Journal of Magnetic
Resonance. 190(2), 333–338.
mla: Kern, Thomas, et al. “Sensitivity-Enhanced IPAP-SOFAST-HMQC for Fast-Pulsing
2D NMR with Reduced Radiofrequency Load.” Journal of Magnetic Resonance,
vol. 190, no. 2, Elsevier, 2008, pp. 333–38, doi:10.1016/j.jmr.2007.11.015.
short: T. Kern, P. Schanda, B. Brutscher, Journal of Magnetic Resonance 190 (2008)
333–338.
date_created: 2020-09-18T10:12:46Z
date_published: 2008-02-01T00:00:00Z
date_updated: 2021-01-12T08:19:35Z
day: '01'
doi: 10.1016/j.jmr.2007.11.015
extern: '1'
intvolume: ' 190'
issue: '2'
keyword:
- Nuclear and High Energy Physics
- Biophysics
- Biochemistry
- Condensed Matter Physics
language:
- iso: eng
month: '02'
oa_version: None
page: 333-338
publication: Journal of Magnetic Resonance
publication_identifier:
issn:
- 1090-7807
publication_status: published
publisher: Elsevier
quality_controlled: '1'
status: public
title: Sensitivity-enhanced IPAP-SOFAST-HMQC for fast-pulsing 2D NMR with reduced
radiofrequency load
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 190
year: '2008'
...
---
_id: '8509'
abstract:
- lang: eng
text: The goal of this paper is to present to nonspecialists what is perhaps the
simplest possible geometrical picture explaining the mechanism of Arnold diffusion.
We choose to speak of a specific model—that of geometric rays in a periodic optical
medium. This model is equivalent to that of a particle in a periodic potential
in ${\mathbb R}^{n}$ with energy prescribed and to the geodesic flow in a Riemannian
metric on ${\mathbb R}^{n} $.
article_processing_charge: No
article_type: original
author:
- first_name: Vadim
full_name: Kaloshin, Vadim
id: FE553552-CDE8-11E9-B324-C0EBE5697425
last_name: Kaloshin
orcid: 0000-0002-6051-2628
- first_name: Mark
full_name: Levi, Mark
last_name: Levi
citation:
ama: Kaloshin V, Levi M. Geometry of Arnold diffusion. SIAM Review. 2008;50(4):702-720.
doi:10.1137/070703235
apa: Kaloshin, V., & Levi, M. (2008). Geometry of Arnold diffusion. SIAM
Review. Society for Industrial & Applied Mathematics. https://doi.org/10.1137/070703235
chicago: Kaloshin, Vadim, and Mark Levi. “Geometry of Arnold Diffusion.” SIAM
Review. Society for Industrial & Applied Mathematics, 2008. https://doi.org/10.1137/070703235.
ieee: V. Kaloshin and M. Levi, “Geometry of Arnold diffusion,” SIAM Review,
vol. 50, no. 4. Society for Industrial & Applied Mathematics, pp. 702–720,
2008.
ista: Kaloshin V, Levi M. 2008. Geometry of Arnold diffusion. SIAM Review. 50(4),
702–720.
mla: Kaloshin, Vadim, and Mark Levi. “Geometry of Arnold Diffusion.” SIAM Review,
vol. 50, no. 4, Society for Industrial & Applied Mathematics, 2008, pp. 702–20,
doi:10.1137/070703235.
short: V. Kaloshin, M. Levi, SIAM Review 50 (2008) 702–720.
date_created: 2020-09-18T10:48:12Z
date_published: 2008-11-05T00:00:00Z
date_updated: 2021-01-12T08:19:46Z
day: '05'
doi: 10.1137/070703235
extern: '1'
intvolume: ' 50'
issue: '4'
keyword:
- Theoretical Computer Science
- Applied Mathematics
- Computational Mathematics
language:
- iso: eng
month: '11'
oa_version: None
page: 702-720
publication: SIAM Review
publication_identifier:
issn:
- 0036-1445
- 1095-7200
publication_status: published
publisher: Society for Industrial & Applied Mathematics
quality_controlled: '1'
status: public
title: Geometry of Arnold diffusion
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 50
year: '2008'
...
---
_id: '8510'
abstract:
- lang: eng
text: In this paper, using the ideas of Bessi and Mather, we present a simple mechanical
system exhibiting Arnold diffusion. This system of a particle in a small periodic
potential can be also interpreted as ray propagation in a periodic optical medium
with a near-constant index of refraction. Arnold diffusion in this context manifests
itself as an arbitrary finite change of direction for nearly constant index of
refraction.
article_processing_charge: No
article_type: original
author:
- first_name: Vadim
full_name: Kaloshin, Vadim
id: FE553552-CDE8-11E9-B324-C0EBE5697425
last_name: Kaloshin
orcid: 0000-0002-6051-2628
- first_name: Mark
full_name: Levi, Mark
last_name: Levi
citation:
ama: Kaloshin V, Levi M. An example of Arnold diffusion for near-integrable Hamiltonians.
Bulletin of the American Mathematical Society. 2008;45(3):409-427. doi:10.1090/s0273-0979-08-01211-1
apa: Kaloshin, V., & Levi, M. (2008). An example of Arnold diffusion for near-integrable
Hamiltonians. Bulletin of the American Mathematical Society. American Mathematical
Society. https://doi.org/10.1090/s0273-0979-08-01211-1
chicago: Kaloshin, Vadim, and Mark Levi. “An Example of Arnold Diffusion for Near-Integrable
Hamiltonians.” Bulletin of the American Mathematical Society. American
Mathematical Society, 2008. https://doi.org/10.1090/s0273-0979-08-01211-1.
ieee: V. Kaloshin and M. Levi, “An example of Arnold diffusion for near-integrable
Hamiltonians,” Bulletin of the American Mathematical Society, vol. 45,
no. 3. American Mathematical Society, pp. 409–427, 2008.
ista: Kaloshin V, Levi M. 2008. An example of Arnold diffusion for near-integrable
Hamiltonians. Bulletin of the American Mathematical Society. 45(3), 409–427.
mla: Kaloshin, Vadim, and Mark Levi. “An Example of Arnold Diffusion for Near-Integrable
Hamiltonians.” Bulletin of the American Mathematical Society, vol. 45,
no. 3, American Mathematical Society, 2008, pp. 409–27, doi:10.1090/s0273-0979-08-01211-1.
short: V. Kaloshin, M. Levi, Bulletin of the American Mathematical Society 45 (2008)
409–427.
date_created: 2020-09-18T10:48:20Z
date_published: 2008-07-01T00:00:00Z
date_updated: 2021-01-12T08:19:47Z
day: '01'
doi: 10.1090/s0273-0979-08-01211-1
extern: '1'
intvolume: ' 45'
issue: '3'
keyword:
- Applied Mathematics
- General Mathematics
language:
- iso: eng
month: '07'
oa_version: None
page: 409-427
publication: Bulletin of the American Mathematical Society
publication_identifier:
issn:
- 0273-0979
publication_status: published
publisher: American Mathematical Society
quality_controlled: '1'
status: public
title: An example of Arnold diffusion for near-integrable Hamiltonians
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 45
year: '2008'
...
---
_id: '895'
abstract:
- lang: eng
text: Background. The arginine vasopressin V1a receptor (V1aR) modulates social
cognition and behavior in a wide variety of species. Variation in a repetitive
microsatellite element in the 5′ flanking region of the V1aR gene (AVPR1A) in
rodents has been associated with variation in brain V1aR expression and in social
behavior. In humans, the 5′ flanking region of AVPR1A contains a tandem duplication
of two ∼350 bp, microsatellite-containing elements located approximately 3.5 kb
upstream of the transcription start site. The first block, referred to as DupA,
contains a polymorphic (GT) 25microsatellite; the second block, DupB, has a complex
(CT) 4-(TT)-(CT)8-(GT)24polymorphic motif, known as RS3. Polymorphisms in RS3
have been associated with variation in sociobehavioral traits in humans, including
autism spectrum disorders. Thus, evolution of these regions may have contributed
to variation in social behavior in primates. We examined the structure of these
regions in six ape, six monkey, and one prosimian species. Results. Both tandem
repeat blocks are present upstream of the AVPR1A coding region in five of the
ape species we investigated, while monkeys have only one copy of this region.
As in humans, the microsatellites within DupA and DupB are polymorphic in many
primate species. Furthermore, both single (lacking DupB) and duplicated alleles
(containing both DupA and DupB) are present in chimpanzee (Pan troglodytes) populations
with allele frequencies of 0.795 and 0.205 for the single and duplicated alleles,
respectively, based on the analysis of 47 wild-caught individuals. Finally, a
phylogenetic reconstruction suggests two alternate evolutionary histories for
this locus. Conclusion. There is no obvious relationship between the presence
of the RS3 duplication and social organization in primates. However, polymorphisms
identified in some species may be useful in future genetic association studies.
In particular, the presence of both single and duplicated alleles in chimpanzees
provides a unique opportunity to assess the functional role of this duplication
in contributing to variation in social behavior in primates. While our initial
studies show no signs of directional selection on this locus in chimps, pharmacological
and genetic association studies support a potential role for this region in influencing
V1aR expression and social behavior.
acknowledgement: |
We thank the caretakers at Zoo Atlanta and Yerkes National Primate Center for help with procuring specimens. Additional DNA samples were supplied by Bill Hopkins, Emory University (chimpanzee), Allyson Bennet, Wake Forest University (chimpanzee, rhesus macaque, bonnet macaque), Mar Sanchez, Emory University (rhesus macaque), and Anne Yoder, Duke University (galago). Susan Lambeth, M.D. Anderson Cancer Center, and Katie Chace, Yerkes National Primate Center, helped provide records regarding the origins of wild born chimps at these centers. We would like to thank Dr Lisa McGraw and two anonymous reviewers for their com- ments on this manuscript. This work was supported by NSF IBN-9876754, NIH RR00165, NIMH56897 (LJY), MH64692 (LJY) and a Howard Hughes Predoctoral Fellowship (ZRD).
author:
- first_name: Zoe
full_name: Donaldson, Zoe R
last_name: Donaldson
- first_name: Fyodor
full_name: Fyodor Kondrashov
id: 44FDEF62-F248-11E8-B48F-1D18A9856A87
last_name: Kondrashov
orcid: 0000-0001-8243-4694
- first_name: Andrea
full_name: Putnam, Andrea S
last_name: Putnam
- first_name: Yaohui
full_name: Bai, Yaohui
last_name: Bai
- first_name: Tara
full_name: Stoinski, Tara S
last_name: Stoinski
- first_name: Elizabeth
full_name: Hammock, Elizabeth A
last_name: Hammock
- first_name: Larry
full_name: Young, Larry
last_name: Young
citation:
ama: Donaldson Z, Kondrashov F, Putnam A, et al. Evolution of a behavior-linked
microsatellite-containing element in the 5′ flanking region of the primate AVPR1A
gene. BMC Evolutionary Biology. 2008;8(1). doi:10.1186/1471-2148-8-180
apa: Donaldson, Z., Kondrashov, F., Putnam, A., Bai, Y., Stoinski, T., Hammock,
E., & Young, L. (2008). Evolution of a behavior-linked microsatellite-containing
element in the 5′ flanking region of the primate AVPR1A gene. BMC Evolutionary
Biology. BioMed Central. https://doi.org/10.1186/1471-2148-8-180
chicago: Donaldson, Zoe, Fyodor Kondrashov, Andrea Putnam, Yaohui Bai, Tara Stoinski,
Elizabeth Hammock, and Larry Young. “Evolution of a Behavior-Linked Microsatellite-Containing
Element in the 5′ Flanking Region of the Primate AVPR1A Gene.” BMC Evolutionary
Biology. BioMed Central, 2008. https://doi.org/10.1186/1471-2148-8-180.
ieee: Z. Donaldson et al., “Evolution of a behavior-linked microsatellite-containing
element in the 5′ flanking region of the primate AVPR1A gene,” BMC Evolutionary
Biology, vol. 8, no. 1. BioMed Central, 2008.
ista: Donaldson Z, Kondrashov F, Putnam A, Bai Y, Stoinski T, Hammock E, Young L.
2008. Evolution of a behavior-linked microsatellite-containing element in the
5′ flanking region of the primate AVPR1A gene. BMC Evolutionary Biology. 8(1).
mla: Donaldson, Zoe, et al. “Evolution of a Behavior-Linked Microsatellite-Containing
Element in the 5′ Flanking Region of the Primate AVPR1A Gene.” BMC Evolutionary
Biology, vol. 8, no. 1, BioMed Central, 2008, doi:10.1186/1471-2148-8-180.
short: Z. Donaldson, F. Kondrashov, A. Putnam, Y. Bai, T. Stoinski, E. Hammock,
L. Young, BMC Evolutionary Biology 8 (2008).
date_created: 2018-12-11T11:49:04Z
date_published: 2008-01-01T00:00:00Z
date_updated: 2021-01-12T08:21:29Z
day: '01'
doi: 10.1186/1471-2148-8-180
extern: 1
intvolume: ' 8'
issue: '1'
month: '01'
publication: BMC Evolutionary Biology
publication_status: published
publisher: BioMed Central
publist_id: '6753'
quality_controlled: 0
status: public
title: Evolution of a behavior-linked microsatellite-containing element in the 5′
flanking region of the primate AVPR1A gene
tmp:
image: /images/cc_by.png
legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode
name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)
short: CC BY (4.0)
type: journal_article
volume: 8
year: '2008'
...
---
_id: '907'
abstract:
- lang: eng
text: The most common form of protein-coding gene overlap in eukaryotes is a simple
nested structure, whereby one gene is embedded in an intron of another. Analysis
of nested protein-coding genes in vertebrates, fruit flies and nematodes revealed
substantially higher rates of evolutionary gains than losses. The accumulation
of nested gene structures could not be attributed to any obvious functional relationships
between the genes involved and represents an increase of the organizational complexity
of animal genomes via a neutral process.
author:
- first_name: Raquel
full_name: Assis, Raquel
last_name: Assis
- first_name: Alexey
full_name: Kondrashov, Alexey S
last_name: Kondrashov
- first_name: Eugene
full_name: Koonin, Eugene V
last_name: Koonin
- first_name: Fyodor
full_name: Fyodor Kondrashov
id: 44FDEF62-F248-11E8-B48F-1D18A9856A87
last_name: Kondrashov
orcid: 0000-0001-8243-4694
citation:
ama: Assis R, Kondrashov A, Koonin E, Kondrashov F. Nested genes and increasing
organizational complexity of metazoan genomes. Trends in Genetics. 2008;24(10):475-478.
doi:10.1016/j.tig.2008.08.003
apa: Assis, R., Kondrashov, A., Koonin, E., & Kondrashov, F. (2008). Nested
genes and increasing organizational complexity of metazoan genomes. Trends
in Genetics. Elsevier. https://doi.org/10.1016/j.tig.2008.08.003
chicago: Assis, Raquel, Alexey Kondrashov, Eugene Koonin, and Fyodor Kondrashov.
“Nested Genes and Increasing Organizational Complexity of Metazoan Genomes.” Trends
in Genetics. Elsevier, 2008. https://doi.org/10.1016/j.tig.2008.08.003.
ieee: R. Assis, A. Kondrashov, E. Koonin, and F. Kondrashov, “Nested genes and increasing
organizational complexity of metazoan genomes,” Trends in Genetics, vol.
24, no. 10. Elsevier, pp. 475–478, 2008.
ista: Assis R, Kondrashov A, Koonin E, Kondrashov F. 2008. Nested genes and increasing
organizational complexity of metazoan genomes. Trends in Genetics. 24(10), 475–478.
mla: Assis, Raquel, et al. “Nested Genes and Increasing Organizational Complexity
of Metazoan Genomes.” Trends in Genetics, vol. 24, no. 10, Elsevier, 2008,
pp. 475–78, doi:10.1016/j.tig.2008.08.003.
short: R. Assis, A. Kondrashov, E. Koonin, F. Kondrashov, Trends in Genetics 24
(2008) 475–478.
date_created: 2018-12-11T11:49:08Z
date_published: 2008-10-01T00:00:00Z
date_updated: 2021-01-12T08:21:49Z
day: '01'
doi: 10.1016/j.tig.2008.08.003
extern: 1
intvolume: ' 24'
issue: '10'
month: '10'
page: 475 - 478
publication: Trends in Genetics
publication_status: published
publisher: Elsevier
publist_id: '6743'
quality_controlled: 0
status: public
title: Nested genes and increasing organizational complexity of metazoan genomes
type: journal_article
volume: 24
year: '2008'
...
---
_id: '7320'
abstract:
- lang: eng
text: A comparative, experimental diffusivity study of gas diffusion layer (GDL)
materials for polymer electrolyte fuel cells (PEFC) is presented for the first
time. The GDL plays an important role for electrochemical losses due to gas transport
limitations at high current densities. Characterization and optimization of these
layers is therefore essential to improve power density. A recently developed method
which allows for fast diffusimetry is applied and data compared to the literature
values. Measurements are made as a function of direction and compression and the
effect of different binder structures and hydrophobic treatments on effective
diffusivities are discussed. A better understanding of the results is gained by
including novel GDL cross-section images and a meaningful unit cell model for
the interpretation of the data. The diffusivity data is valuable for GDL manufacturers
and future PEFC models. The study reveals that a binder–fiber ratio larger than
50% has a negative impact on the effective diffusion properties. The hydrophobic
treatment which is necessary to improve the water management can impede diffusion
and thus reduce the power density. Furthermore binder has an isotropic effect
while compression pronounces the in-plane orientation of the fibers.
article_processing_charge: No
article_type: original
author:
- first_name: Reto
full_name: Flückiger, Reto
last_name: Flückiger
- first_name: Stefan Alexander
full_name: Freunberger, Stefan Alexander
id: A8CA28E6-CE23-11E9-AD2D-EC27E6697425
last_name: Freunberger
orcid: 0000-0003-2902-5319
- first_name: Denis
full_name: Kramer, Denis
last_name: Kramer
- first_name: Alexander
full_name: Wokaun, Alexander
last_name: Wokaun
- first_name: Günther G.
full_name: Scherer, Günther G.
last_name: Scherer
- first_name: Felix N.
full_name: Büchi, Felix N.
last_name: Büchi
citation:
ama: Flückiger R, Freunberger SA, Kramer D, Wokaun A, Scherer GG, Büchi FN. Anisotropic,
effective diffusivity of porous gas diffusion layer materials for PEFC. Electrochimica
Acta. 2008;54(2):551-559. doi:10.1016/j.electacta.2008.07.034
apa: Flückiger, R., Freunberger, S. A., Kramer, D., Wokaun, A., Scherer, G. G.,
& Büchi, F. N. (2008). Anisotropic, effective diffusivity of porous gas diffusion
layer materials for PEFC. Electrochimica Acta. Elsevier. https://doi.org/10.1016/j.electacta.2008.07.034
chicago: Flückiger, Reto, Stefan Alexander Freunberger, Denis Kramer, Alexander
Wokaun, Günther G. Scherer, and Felix N. Büchi. “Anisotropic, Effective Diffusivity
of Porous Gas Diffusion Layer Materials for PEFC.” Electrochimica Acta.
Elsevier, 2008. https://doi.org/10.1016/j.electacta.2008.07.034.
ieee: R. Flückiger, S. A. Freunberger, D. Kramer, A. Wokaun, G. G. Scherer, and
F. N. Büchi, “Anisotropic, effective diffusivity of porous gas diffusion layer
materials for PEFC,” Electrochimica Acta, vol. 54, no. 2. Elsevier, pp.
551–559, 2008.
ista: Flückiger R, Freunberger SA, Kramer D, Wokaun A, Scherer GG, Büchi FN. 2008.
Anisotropic, effective diffusivity of porous gas diffusion layer materials for
PEFC. Electrochimica Acta. 54(2), 551–559.
mla: Flückiger, Reto, et al. “Anisotropic, Effective Diffusivity of Porous Gas Diffusion
Layer Materials for PEFC.” Electrochimica Acta, vol. 54, no. 2, Elsevier,
2008, pp. 551–59, doi:10.1016/j.electacta.2008.07.034.
short: R. Flückiger, S.A. Freunberger, D. Kramer, A. Wokaun, G.G. Scherer, F.N.
Büchi, Electrochimica Acta 54 (2008) 551–559.
date_created: 2020-01-15T12:21:36Z
date_published: 2008-12-30T00:00:00Z
date_updated: 2021-01-12T08:13:02Z
day: '30'
doi: 10.1016/j.electacta.2008.07.034
extern: '1'
intvolume: ' 54'
issue: '2'
language:
- iso: eng
month: '12'
oa_version: None
page: 551-559
publication: Electrochimica Acta
publication_identifier:
issn:
- 0013-4686
publication_status: published
publisher: Elsevier
quality_controlled: '1'
status: public
title: Anisotropic, effective diffusivity of porous gas diffusion layer materials
for PEFC
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 54
year: '2008'
...
---
_id: '7321'
abstract:
- lang: eng
text: Cell interaction phenomena in polymer electrolyte fuel cell stacks that arise
from imbalance between adjacent cells are investigated in detail experimentally
and theoretically. A specialized two-cell stack with advanced localized diagnostics
was developed and used to analyze the mechanism and effect of cell-to-cell coupling
as a result of operationally relevant variations in reactant feed flow. Contributions
to overall and local voltage changes with respect to uniformly operated cells
are scrutinized. Unequal operation of the cells causes in-plane current in the
bipolar plate to redistribute current and result in inhomogeneous polarization.
Both increasing and decreasing polarization along the air-flow path reduces cell
power as compared to isopotential operation. A two-dimensional model based on
a commercial computational fluid dynamics code is used to back and extend the
experimental results to more general cases. Furthermore, the experimental setup
presented allowed for the first time to perform simultaneous localized electrochemical
impedance spectroscopy beyond the single-cell level. The mechanism of mutual cell
interaction on local and integral spectra is revealed. Results show that virtually
identical operation of the cells is essential to obtain meaningful integral spectra.
article_number: B704
article_processing_charge: No
article_type: original
author:
- first_name: Stefan Alexander
full_name: Freunberger, Stefan Alexander
id: A8CA28E6-CE23-11E9-AD2D-EC27E6697425
last_name: Freunberger
orcid: 0000-0003-2902-5319
- first_name: Ingo A.
full_name: Schneider, Ingo A.
last_name: Schneider
- first_name: Pang-Chieh
full_name: Sui, Pang-Chieh
last_name: Sui
- first_name: Alexander
full_name: Wokaun, Alexander
last_name: Wokaun
- first_name: Nedjib
full_name: Djilali, Nedjib
last_name: Djilali
- first_name: Felix N.
full_name: Büchi, Felix N.
last_name: Büchi
citation:
ama: Freunberger SA, Schneider IA, Sui P-C, Wokaun A, Djilali N, Büchi FN. Cell
interaction phenomena in polymer electrolyte fuel cell stacks. Journal of The
Electrochemical Society. 2008;155(7). doi:10.1149/1.2913095
apa: Freunberger, S. A., Schneider, I. A., Sui, P.-C., Wokaun, A., Djilali, N.,
& Büchi, F. N. (2008). Cell interaction phenomena in polymer electrolyte
fuel cell stacks. Journal of The Electrochemical Society. The Electrochemical
Society. https://doi.org/10.1149/1.2913095
chicago: Freunberger, Stefan Alexander, Ingo A. Schneider, Pang-Chieh Sui, Alexander
Wokaun, Nedjib Djilali, and Felix N. Büchi. “Cell Interaction Phenomena in Polymer
Electrolyte Fuel Cell Stacks.” Journal of The Electrochemical Society.
The Electrochemical Society, 2008. https://doi.org/10.1149/1.2913095.
ieee: S. A. Freunberger, I. A. Schneider, P.-C. Sui, A. Wokaun, N. Djilali, and
F. N. Büchi, “Cell interaction phenomena in polymer electrolyte fuel cell stacks,”
Journal of The Electrochemical Society, vol. 155, no. 7. The Electrochemical
Society, 2008.
ista: Freunberger SA, Schneider IA, Sui P-C, Wokaun A, Djilali N, Büchi FN. 2008.
Cell interaction phenomena in polymer electrolyte fuel cell stacks. Journal of
The Electrochemical Society. 155(7), B704.
mla: Freunberger, Stefan Alexander, et al. “Cell Interaction Phenomena in Polymer
Electrolyte Fuel Cell Stacks.” Journal of The Electrochemical Society,
vol. 155, no. 7, B704, The Electrochemical Society, 2008, doi:10.1149/1.2913095.
short: S.A. Freunberger, I.A. Schneider, P.-C. Sui, A. Wokaun, N. Djilali, F.N.
Büchi, Journal of The Electrochemical Society 155 (2008).
date_created: 2020-01-15T12:21:47Z
date_published: 2008-05-08T00:00:00Z
date_updated: 2021-01-12T08:13:03Z
day: '08'
doi: 10.1149/1.2913095
extern: '1'
intvolume: ' 155'
issue: '7'
language:
- iso: eng
month: '05'
oa_version: None
publication: Journal of The Electrochemical Society
publication_identifier:
issn:
- 0013-4651
publication_status: published
publisher: The Electrochemical Society
quality_controlled: '1'
status: public
title: Cell interaction phenomena in polymer electrolyte fuel cell stacks
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 155
year: '2008'
...
---
_id: '7322'
abstract:
- lang: eng
text: The gas diffusion layers (GDLs) of a membrane electrode assembly (MEA) serve
as link between flow field and porous electrode within a polymer electrolyte fuel
cell. Beside ensuring sufficient electrical and thermal contact between the whole
electrode area and the flow field, these typically 200–400 μm thick porous structures
enable the access of educts to the electrode area which would be occluded by the
flow field lands if the flow field is directly attached to the electrode. Hence,
the characterisation of properties pertaining to mass transport of educts and
products through these structures is indispensable whilst examining the contribution
of the GDLs to the overall electrochemical characteristics of a MEA. A fast and
cost effective method to measure the effective diffusivity of a GDL is presented.
Electrochemical impedance spectroscopy is applied to measure the effective ionic
conductivity of an electrolyte-soaked GDL. Taking advantage of the analogy between
Ficks and Ohms law, this provides a measure for the effective diffusivity. The
method is described in detail, including experimental as well as theoretical aspects,
and selected results, highlighting the anisotropy and dependence on the degree
of compression, are shown. Moreover, a two-dimensional model consisting of regularly
spaced ellipses is developed to represent the porous structure of the GDL, and
by using conformal maps, the agreement between this model and experiment with
respect to the sensitivity of the effective diffusivity towards compression is
shown.
article_processing_charge: No
article_type: original
author:
- first_name: Denis
full_name: Kramer, Denis
last_name: Kramer
- first_name: Stefan Alexander
full_name: Freunberger, Stefan Alexander
id: A8CA28E6-CE23-11E9-AD2D-EC27E6697425
last_name: Freunberger
orcid: 0000-0003-2902-5319
- first_name: Reto
full_name: Flückiger, Reto
last_name: Flückiger
- first_name: Ingo A.
full_name: Schneider, Ingo A.
last_name: Schneider
- first_name: Alexander
full_name: Wokaun, Alexander
last_name: Wokaun
- first_name: Felix N.
full_name: Büchi, Felix N.
last_name: Büchi
- first_name: Günther G.
full_name: Scherer, Günther G.
last_name: Scherer
citation:
ama: Kramer D, Freunberger SA, Flückiger R, et al. Electrochemical diffusimetry
of fuel cell gas diffusion layers. Journal of Electroanalytical Chemistry.
2008;612(1):63-77. doi:10.1016/j.jelechem.2007.09.014
apa: Kramer, D., Freunberger, S. A., Flückiger, R., Schneider, I. A., Wokaun, A.,
Büchi, F. N., & Scherer, G. G. (2008). Electrochemical diffusimetry of fuel
cell gas diffusion layers. Journal of Electroanalytical Chemistry. Elsevier.
https://doi.org/10.1016/j.jelechem.2007.09.014
chicago: Kramer, Denis, Stefan Alexander Freunberger, Reto Flückiger, Ingo A. Schneider,
Alexander Wokaun, Felix N. Büchi, and Günther G. Scherer. “Electrochemical Diffusimetry
of Fuel Cell Gas Diffusion Layers.” Journal of Electroanalytical Chemistry.
Elsevier, 2008. https://doi.org/10.1016/j.jelechem.2007.09.014.
ieee: D. Kramer et al., “Electrochemical diffusimetry of fuel cell gas diffusion
layers,” Journal of Electroanalytical Chemistry, vol. 612, no. 1. Elsevier,
pp. 63–77, 2008.
ista: Kramer D, Freunberger SA, Flückiger R, Schneider IA, Wokaun A, Büchi FN, Scherer
GG. 2008. Electrochemical diffusimetry of fuel cell gas diffusion layers. Journal
of Electroanalytical Chemistry. 612(1), 63–77.
mla: Kramer, Denis, et al. “Electrochemical Diffusimetry of Fuel Cell Gas Diffusion
Layers.” Journal of Electroanalytical Chemistry, vol. 612, no. 1, Elsevier,
2008, pp. 63–77, doi:10.1016/j.jelechem.2007.09.014.
short: D. Kramer, S.A. Freunberger, R. Flückiger, I.A. Schneider, A. Wokaun, F.N.
Büchi, G.G. Scherer, Journal of Electroanalytical Chemistry 612 (2008) 63–77.
date_created: 2020-01-15T12:21:57Z
date_published: 2008-01-01T00:00:00Z
date_updated: 2021-01-12T08:13:03Z
day: '01'
doi: 10.1016/j.jelechem.2007.09.014
extern: '1'
intvolume: ' 612'
issue: '1'
language:
- iso: eng
month: '01'
oa_version: None
page: 63-77
publication: Journal of Electroanalytical Chemistry
publication_identifier:
issn:
- 1572-6657
publication_status: published
publisher: Elsevier
quality_controlled: '1'
status: public
title: Electrochemical diffusimetry of fuel cell gas diffusion layers
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 612
year: '2008'
...
---
_id: '7425'
abstract:
- lang: eng
text: The propagation of single cell performance losses to adjacent cells in a polymer
electrolyte fuel cell stack is studied by means of local current density measurements
in a two cell stack. In this stack, the working conditions of adjacent cells can
be controlled independently in order to deliberately change the performance of
one cell (inducing cell) and study the coupling effects to the adjacent cell (response
cell), while keeping the working conditions of the later one unchanged. The experiments
have shown that changes in the current density distribution caused by lowering
of the air stoichiometry in the inducing cell cause changes in the current density
distribution of the response cell in the order of 60% of the change of the inducing
cell, even when the air stoichiometry of the response cell is kept constant. The
losses in cell voltage of the inducing cell cause losses in cell voltage of the
response cell in a magnitude between 30 and 50%.
article_processing_charge: No
author:
- first_name: Marco
full_name: Santis, Marco
last_name: Santis
- first_name: Stefan Alexander
full_name: Freunberger, Stefan Alexander
id: A8CA28E6-CE23-11E9-AD2D-EC27E6697425
last_name: Freunberger
orcid: 0000-0003-2902-5319
- first_name: Matthias
full_name: Papra, Matthias
last_name: Papra
- first_name: Felix N.
full_name: Büchi, Felix N.
last_name: Büchi
citation:
ama: 'Santis M, Freunberger SA, Papra M, Büchi FN. Experimental investigation of
the propagation of local current density variations to adjacent cells in PEFC
stacks. In: 3rd International Conference on Fuel Cell Science, Engineering
and Technology. ASMEDC; 2008:763-765. doi:10.1115/fuelcell2005-74116'
apa: 'Santis, M., Freunberger, S. A., Papra, M., & Büchi, F. N. (2008). Experimental
investigation of the propagation of local current density variations to adjacent
cells in PEFC stacks. In 3rd International Conference on Fuel Cell Science,
Engineering and Technology (pp. 763–765). Ypsilanti, MI, United States: ASMEDC.
https://doi.org/10.1115/fuelcell2005-74116'
chicago: Santis, Marco, Stefan Alexander Freunberger, Matthias Papra, and Felix
N. Büchi. “Experimental Investigation of the Propagation of Local Current Density
Variations to Adjacent Cells in PEFC Stacks.” In 3rd International Conference
on Fuel Cell Science, Engineering and Technology, 763–65. ASMEDC, 2008. https://doi.org/10.1115/fuelcell2005-74116.
ieee: M. Santis, S. A. Freunberger, M. Papra, and F. N. Büchi, “Experimental investigation
of the propagation of local current density variations to adjacent cells in PEFC
stacks,” in 3rd International Conference on Fuel Cell Science, Engineering
and Technology, Ypsilanti, MI, United States, 2008, pp. 763–765.
ista: Santis M, Freunberger SA, Papra M, Büchi FN. 2008. Experimental investigation
of the propagation of local current density variations to adjacent cells in PEFC
stacks. 3rd International Conference on Fuel Cell Science, Engineering and Technology.
International conference on fuel cell science, engineering and technology, 763–765.
mla: Santis, Marco, et al. “Experimental Investigation of the Propagation of Local
Current Density Variations to Adjacent Cells in PEFC Stacks.” 3rd International
Conference on Fuel Cell Science, Engineering and Technology, ASMEDC, 2008,
pp. 763–65, doi:10.1115/fuelcell2005-74116.
short: M. Santis, S.A. Freunberger, M. Papra, F.N. Büchi, in:, 3rd International
Conference on Fuel Cell Science, Engineering and Technology, ASMEDC, 2008, pp.
763–765.
conference:
end_date: 2005-05-25
location: Ypsilanti, MI, United States
name: International conference on fuel cell science, engineering and technology
start_date: 2005-05-23
date_created: 2020-01-31T10:14:45Z
date_published: 2008-10-13T00:00:00Z
date_updated: 2021-01-12T08:13:33Z
day: '13'
doi: 10.1115/fuelcell2005-74116
extern: '1'
language:
- iso: eng
month: '10'
oa_version: None
page: 763-765
publication: 3rd International Conference on Fuel Cell Science, Engineering and Technology
publication_identifier:
isbn:
- '0791837645'
- '0791837572'
publication_status: published
publisher: ASMEDC
quality_controlled: '1'
status: public
title: Experimental investigation of the propagation of local current density variations
to adjacent cells in PEFC stacks
type: conference
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
year: '2008'
...