---
_id: '2429'
abstract:
- lang: eng
text: 'We show, with an elementary proof, that the number of halving simplices in
a set of n points in 4 in general position is O(n4-2/45). This improves the previous
bound of O(n4-1/134). Our main new ingredient is a bound on the maximum number
of halving simplices intersecting a fixed 2-plane. '
author:
- first_name: Jiří
full_name: Matoušek, Jiří
last_name: Matoušek
- first_name: Micha
full_name: Sharir, Micha
last_name: Sharir
- first_name: Shakhar
full_name: Smorodinsky, Shakhar
last_name: Smorodinsky
- first_name: Uli
full_name: Uli Wagner
id: 36690CA2-F248-11E8-B48F-1D18A9856A87
last_name: Wagner
orcid: 0000-0002-1494-0568
citation:
ama: Matoušek J, Sharir M, Smorodinsky S, Wagner U. K-sets in four dimensions. Discrete
& Computational Geometry. 2006;35(2):177-191. doi:10.1007/s00454-005-1200-4
apa: Matoušek, J., Sharir, M., Smorodinsky, S., & Wagner, U. (2006). K-sets
in four dimensions. Discrete & Computational Geometry. Springer. https://doi.org/10.1007/s00454-005-1200-4
chicago: Matoušek, Jiří, Micha Sharir, Shakhar Smorodinsky, and Uli Wagner. “K-Sets
in Four Dimensions.” Discrete & Computational Geometry. Springer, 2006.
https://doi.org/10.1007/s00454-005-1200-4.
ieee: J. Matoušek, M. Sharir, S. Smorodinsky, and U. Wagner, “K-sets in four dimensions,”
Discrete & Computational Geometry, vol. 35, no. 2. Springer, pp. 177–191,
2006.
ista: Matoušek J, Sharir M, Smorodinsky S, Wagner U. 2006. K-sets in four dimensions.
Discrete & Computational Geometry. 35(2), 177–191.
mla: Matoušek, Jiří, et al. “K-Sets in Four Dimensions.” Discrete & Computational
Geometry, vol. 35, no. 2, Springer, 2006, pp. 177–91, doi:10.1007/s00454-005-1200-4.
short: J. Matoušek, M. Sharir, S. Smorodinsky, U. Wagner, Discrete & Computational
Geometry 35 (2006) 177–191.
date_created: 2018-12-11T11:57:37Z
date_published: 2006-02-01T00:00:00Z
date_updated: 2021-01-12T06:57:26Z
day: '01'
doi: 10.1007/s00454-005-1200-4
extern: 1
intvolume: ' 35'
issue: '2'
month: '02'
page: 177 - 191
publication: Discrete & Computational Geometry
publication_status: published
publisher: Springer
publist_id: '4495'
quality_controlled: 0
status: public
title: K-sets in four dimensions
type: journal_article
volume: 35
year: '2006'
...
---
_id: '2430'
abstract:
- lang: eng
text: We consider an online version of the conflict-free coloring of a set of points
on the line, where each newly inserted point must be assigned a color upon insertion,
and at all times the coloring has to be conflict-free, in the sense that in every
interval I there is a color that appears exactly once in I. We present deterministic
and randomized algorithms for achieving this goal, and analyze their performance,
that is, the maximum number of colors that they need to use, as a function of
the number n of inserted points. We first show that a natural and simple (deterministic)
approach may perform rather poorly, requiring Ω(√̃) colors in the worst case.
We then derive two efficient variants of this simple algorithm. The first is deterministic
and uses O(log 2 n) colors, and the second is randomized and uses O(log n) colors
with high probability. We also show that the O(log 2 n) bound on the number of
colors used by our deterministic algorithm is tight on the worst case. We also
analyze the performance of the simplest proposed algorithm when the points are
inserted in a random order and present an incomplete analysis that indicates that,
with high probability, it uses only O(log n) colors. Finally, we show that in
the extension of this problem to two dimensions, where the relevant ranges are
disks, n colors may be required in the worst case.
author:
- first_name: Ke
full_name: Chent, Ke
last_name: Chent
- first_name: Amos
full_name: Fiat, Amos
last_name: Fiat
- first_name: Haim
full_name: Kaplan, Haim
last_name: Kaplan
- first_name: Meital
full_name: Levy, Meital B
last_name: Levy
- first_name: Jiří
full_name: Matoušek, Jiří
last_name: Matoušek
- first_name: Elchanan
full_name: Mossel, Elchanan
last_name: Mossel
- first_name: János
full_name: Pach, János
last_name: Pach
- first_name: Micha
full_name: Sharir, Micha
last_name: Sharir
- first_name: Shakhar
full_name: Smorodinsky, Shakhar
last_name: Smorodinsky
- first_name: Uli
full_name: Uli Wagner
id: 36690CA2-F248-11E8-B48F-1D18A9856A87
last_name: Wagner
orcid: 0000-0002-1494-0568
- first_name: Emo
full_name: Welzl, Emo
last_name: Welzl
citation:
ama: Chent K, Fiat A, Kaplan H, et al. Online conflict-free coloring for intervals.
SIAM Journal on Computing. 2006;36(5):1342-1359. doi:10.1137/S0097539704446682
apa: Chent, K., Fiat, A., Kaplan, H., Levy, M., Matoušek, J., Mossel, E., … Welzl,
E. (2006). Online conflict-free coloring for intervals. SIAM Journal on Computing.
SIAM. https://doi.org/10.1137/S0097539704446682
chicago: Chent, Ke, Amos Fiat, Haim Kaplan, Meital Levy, Jiří Matoušek, Elchanan
Mossel, János Pach, et al. “Online Conflict-Free Coloring for Intervals.” SIAM
Journal on Computing. SIAM, 2006. https://doi.org/10.1137/S0097539704446682.
ieee: K. Chent et al., “Online conflict-free coloring for intervals,” SIAM
Journal on Computing, vol. 36, no. 5. SIAM, pp. 1342–1359, 2006.
ista: Chent K, Fiat A, Kaplan H, Levy M, Matoušek J, Mossel E, Pach J, Sharir M,
Smorodinsky S, Wagner U, Welzl E. 2006. Online conflict-free coloring for intervals.
SIAM Journal on Computing. 36(5), 1342–1359.
mla: Chent, Ke, et al. “Online Conflict-Free Coloring for Intervals.” SIAM Journal
on Computing, vol. 36, no. 5, SIAM, 2006, pp. 1342–59, doi:10.1137/S0097539704446682.
short: K. Chent, A. Fiat, H. Kaplan, M. Levy, J. Matoušek, E. Mossel, J. Pach, M.
Sharir, S. Smorodinsky, U. Wagner, E. Welzl, SIAM Journal on Computing 36 (2006)
1342–1359.
date_created: 2018-12-11T11:57:37Z
date_published: 2006-01-01T00:00:00Z
date_updated: 2021-01-12T06:57:26Z
day: '01'
doi: 10.1137/S0097539704446682
extern: 1
intvolume: ' 36'
issue: '5'
month: '01'
page: 1342 - 1359
publication: SIAM Journal on Computing
publication_status: published
publisher: SIAM
publist_id: '4490'
quality_controlled: 0
status: public
title: Online conflict-free coloring for intervals
type: journal_article
volume: 36
year: '2006'
...
---
_id: '2431'
abstract:
- lang: eng
text: We prove an upper bound, tight up to a factor of 2, for the number of vertices
of level at most t in an arrangement of n halfspaces in R , for arbitrary n and
d (in particular, the dimension d is not considered constant). This partially
settles a conjecture of Eckhoff, Linhart, and Welzl. Up to the factor of 2, the
result generalizes McMullen's Upper Bound Theorem for convex polytopes (the case
ℓ = O) and extends a theorem of Linhart for the case d ≤ 4. Moreover, the bound
sharpens asymptotic estimates obtained by Clarkson and Shor. The proof is based
on the h-matrix of the arrangement (a generalization, introduced by Mulmuley,
of the h-vector of a convex polytope). We show that bounding appropriate sums
of entries of this matrix reduces to a lemma about quadrupels of sets with certain
intersection properties, and we prove this lemma, up to a factor of 2, using tools
from multilinear algebra. This extends an approach of Alon and Kalai, who used
linear algebra methods for an alternative proof of the classical Upper Bound Theorem.
The bounds for the entries of the h-matrix also imply bounds for the number of
i-dimensional faces, i > 0, at level at most ℓ. Furthermore, we discuss a connection
with crossing numbers of graphs that was one of the main motivations for investigating
exact bounds that are valid for arbitrary dimensions.
alternative_title:
- IEEE Conference Proceedings
author:
- first_name: Uli
full_name: Uli Wagner
id: 36690CA2-F248-11E8-B48F-1D18A9856A87
last_name: Wagner
orcid: 0000-0002-1494-0568
citation:
ama: 'Wagner U. On a geometric generalization of the Upper Bound Theorem. In: IEEE;
2006:635-645. doi:10.1109/FOCS.2006.53'
apa: 'Wagner, U. (2006). On a geometric generalization of the Upper Bound Theorem
(pp. 635–645). Presented at the FOCS: Foundations of Computer Science, IEEE. https://doi.org/10.1109/FOCS.2006.53'
chicago: Wagner, Uli. “On a Geometric Generalization of the Upper Bound Theorem,”
635–45. IEEE, 2006. https://doi.org/10.1109/FOCS.2006.53.
ieee: 'U. Wagner, “On a geometric generalization of the Upper Bound Theorem,” presented
at the FOCS: Foundations of Computer Science, 2006, pp. 635–645.'
ista: 'Wagner U. 2006. On a geometric generalization of the Upper Bound Theorem.
FOCS: Foundations of Computer Science, IEEE Conference Proceedings, , 635–645.'
mla: Wagner, Uli. On a Geometric Generalization of the Upper Bound Theorem.
IEEE, 2006, pp. 635–45, doi:10.1109/FOCS.2006.53.
short: U. Wagner, in:, IEEE, 2006, pp. 635–645.
conference:
name: 'FOCS: Foundations of Computer Science'
date_created: 2018-12-11T11:57:37Z
date_published: 2006-06-08T00:00:00Z
date_updated: 2021-01-12T06:57:27Z
day: '08'
doi: 10.1109/FOCS.2006.53
extern: 1
month: '06'
page: 635 - 645
publication_status: published
publisher: IEEE
publist_id: '4489'
quality_controlled: 0
status: public
title: On a geometric generalization of the Upper Bound Theorem
type: conference
year: '2006'
...
---
_id: '7326'
abstract:
- lang: eng
text: 'Often the properties of a single cell are considered as representative for
a complete polymer electrolyte fuel cell stack or even a fuel cell system. In
some cases this comes close, however, in many real cases differences on several
scales become important. Cell interaction phenomena in fuel cell stacks that arise
from inequalities between adjacent cells are investigated in detail experimentally.
For that, a specialized 2-cell stack with advanced localized diagnostics was developed.
The results show that inequalities propagate by electrical coupling, inhomogeneous
cell polarization and inducing in-plane current in the common bipolar plate. The
effects of the different loss-mechanisms are analyzed and quantified. '
article_processing_charge: No
author:
- first_name: Felix N.
full_name: Büchi, Felix N.
last_name: Büchi
- 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: Marco
full_name: Santis, Marco
last_name: Santis
citation:
ama: 'Büchi FN, Freunberger SA, Santis M. What is learned beyond the scale of single
cells? In: ECS Transactions. Vol 3. ECS; 2006:963-968. doi:10.1149/1.2356215'
apa: 'Büchi, F. N., Freunberger, S. A., & Santis, M. (2006). What is learned
beyond the scale of single cells? In ECS Transactions (Vol. 3, pp. 963–968).
Cancun, Mexico: ECS. https://doi.org/10.1149/1.2356215'
chicago: Büchi, Felix N., Stefan Alexander Freunberger, and Marco Santis. “What
Is Learned beyond the Scale of Single Cells?” In ECS Transactions, 3:963–68.
ECS, 2006. https://doi.org/10.1149/1.2356215.
ieee: F. N. Büchi, S. A. Freunberger, and M. Santis, “What is learned beyond the
scale of single cells?,” in ECS Transactions, Cancun, Mexico, 2006, vol.
3, no. 1, pp. 963–968.
ista: Büchi FN, Freunberger SA, Santis M. 2006. What is learned beyond the scale
of single cells? ECS Transactions. ECS Meeting vol. 3, 963–968.
mla: Büchi, Felix N., et al. “What Is Learned beyond the Scale of Single Cells?”
ECS Transactions, vol. 3, no. 1, ECS, 2006, pp. 963–68, doi:10.1149/1.2356215.
short: F.N. Büchi, S.A. Freunberger, M. Santis, in:, ECS Transactions, ECS, 2006,
pp. 963–968.
conference:
end_date: 2006-11-03
location: Cancun, Mexico
name: ECS Meeting
start_date: 2006-10-29
date_created: 2020-01-15T12:22:44Z
date_published: 2006-11-03T00:00:00Z
date_updated: 2021-01-12T08:13:05Z
day: '03'
doi: 10.1149/1.2356215
extern: '1'
intvolume: ' 3'
issue: '1'
language:
- iso: eng
month: '11'
oa_version: None
page: 963-968
publication: ECS Transactions
publication_status: published
publisher: ECS
quality_controlled: '1'
status: public
title: What is learned beyond the scale of single cells?
type: conference
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 3
year: '2006'
...
---
_id: '7327'
abstract:
- lang: eng
text: "Propagation of performance changes to adjacent cells in polymer electrolyte
fuel cell stacks is studied by means of voltage monitoring and local current density
measurements in peripheral cells of the stack. A technical fuel cell stack has
been modified by implementing two independent reactant and coolant supplies in
order to deliberately change the performance of one cell (anomalous cell) and
study the coupling phenomena to adjacent cells (coupling cells), while keeping
the working conditions of the later cell-group unaltered.\r\nTwo anomalies are
studied: (i) air starvation and (ii) thermal anomaly, in a single anomalous cell
in the stack and their coupling to adjacent cells. The results have shown that
anomalies inducing considerable changes in the local current density of the anomalous
cell (such as air starvation) propagate to adjacent cells affecting their performance.
The propagation of local current density changes takes place via the common bipolar
plate due to its finite thickness and in-plane conductivity. Consequently, anomalies
which do not strongly influence the local current density distribution (such as
a thermal anomaly under the studied working conditions) do not propagate to adjacent
cells."
article_processing_charge: No
article_type: original
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: Alexander
full_name: Wokaun, Alexander
last_name: Wokaun
- first_name: Felix N.
full_name: Büchi, Felix N.
last_name: Büchi
citation:
ama: Santis M, Freunberger SA, Papra M, Wokaun A, Büchi FN. Experimental investigation
of coupling phenomena in polymer electrolyte fuel cell stacks. Journal of Power
Sources. 2006;161(2):1076-1083. doi:10.1016/j.jpowsour.2006.06.007
apa: Santis, M., Freunberger, S. A., Papra, M., Wokaun, A., & Büchi, F. N. (2006).
Experimental investigation of coupling phenomena in polymer electrolyte fuel cell
stacks. Journal of Power Sources. Elsevier. https://doi.org/10.1016/j.jpowsour.2006.06.007
chicago: Santis, Marco, Stefan Alexander Freunberger, Matthias Papra, Alexander
Wokaun, and Felix N. Büchi. “Experimental Investigation of Coupling Phenomena
in Polymer Electrolyte Fuel Cell Stacks.” Journal of Power Sources. Elsevier,
2006. https://doi.org/10.1016/j.jpowsour.2006.06.007.
ieee: M. Santis, S. A. Freunberger, M. Papra, A. Wokaun, and F. N. Büchi, “Experimental
investigation of coupling phenomena in polymer electrolyte fuel cell stacks,”
Journal of Power Sources, vol. 161, no. 2. Elsevier, pp. 1076–1083, 2006.
ista: Santis M, Freunberger SA, Papra M, Wokaun A, Büchi FN. 2006. Experimental
investigation of coupling phenomena in polymer electrolyte fuel cell stacks. Journal
of Power Sources. 161(2), 1076–1083.
mla: Santis, Marco, et al. “Experimental Investigation of Coupling Phenomena in
Polymer Electrolyte Fuel Cell Stacks.” Journal of Power Sources, vol. 161,
no. 2, Elsevier, 2006, pp. 1076–83, doi:10.1016/j.jpowsour.2006.06.007.
short: M. Santis, S.A. Freunberger, M. Papra, A. Wokaun, F.N. Büchi, Journal of
Power Sources 161 (2006) 1076–1083.
date_created: 2020-01-15T12:22:56Z
date_published: 2006-10-27T00:00:00Z
date_updated: 2021-01-12T08:13:06Z
day: '27'
doi: 10.1016/j.jpowsour.2006.06.007
extern: '1'
intvolume: ' 161'
issue: '2'
language:
- iso: eng
month: '10'
oa_version: None
page: 1076-1083
publication: Journal of Power Sources
publication_identifier:
issn:
- 0378-7753
publication_status: published
publisher: Elsevier
status: public
title: Experimental investigation of coupling phenomena in polymer electrolyte fuel
cell stacks
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 161
year: '2006'
...
---
_id: '7328'
abstract:
- lang: eng
text: An experimental technique for measuring the current density distribution with
a resolution smaller than the channel/rib scale of the flow field in polymer electrolyte
fuel cells (PEFCs) is presented. The electron conductors in a plane perpendicular
to the channel direction are considered as two-dimensional resistors. Hence, the
current density is obtained from the solution of Laplace's equation with the potentials
at current collector and reaction layer as boundary conditions. Using ohmic drop
for calculating the local current, detailed knowledge of all resistances involved
is of prime importance. In particular, the contact resistance between the gas
diffusion layer (GDL) and flow field rib, as well as GDL bulk conductivity, are
strongly dependent on clamping pressure. They represent a substantial amount of
the total ohmic drop and therefore require careful consideration. The detailed
experimental setup as well as the concise procedure for quantitative data evaluation
is described. Finally, the method is applied successfully to a cell operated on
pure oxygen and air up to high current densities. The results show that electrical
and ionic resistances seem to govern the current distribution at low current regimes,
whereas mass transport limitations locally hamper the current production at high
loads.
article_number: A2158
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: Mathias
full_name: Reum, Mathias
last_name: Reum
- first_name: Jörg
full_name: Evertz, Jörg
last_name: Evertz
- first_name: Alexander
full_name: Wokaun, Alexander
last_name: Wokaun
- first_name: Felix N.
full_name: Büchi, Felix N.
last_name: Büchi
citation:
ama: Freunberger SA, Reum M, Evertz J, Wokaun A, Büchi FN. Measuring the current
distribution in PEFCs with sub-millimeter resolution. Journal of The Electrochemical
Society. 2006;153(11). doi:10.1149/1.2345591
apa: Freunberger, S. A., Reum, M., Evertz, J., Wokaun, A., & Büchi, F. N. (2006).
Measuring the current distribution in PEFCs with sub-millimeter resolution. Journal
of The Electrochemical Society. The Electrochemical Society. https://doi.org/10.1149/1.2345591
chicago: Freunberger, Stefan Alexander, Mathias Reum, Jörg Evertz, Alexander Wokaun,
and Felix N. Büchi. “Measuring the Current Distribution in PEFCs with Sub-Millimeter
Resolution.” Journal of The Electrochemical Society. The Electrochemical
Society, 2006. https://doi.org/10.1149/1.2345591.
ieee: S. A. Freunberger, M. Reum, J. Evertz, A. Wokaun, and F. N. Büchi, “Measuring
the current distribution in PEFCs with sub-millimeter resolution,” Journal
of The Electrochemical Society, vol. 153, no. 11. The Electrochemical Society,
2006.
ista: Freunberger SA, Reum M, Evertz J, Wokaun A, Büchi FN. 2006. Measuring the
current distribution in PEFCs with sub-millimeter resolution. Journal of The Electrochemical
Society. 153(11), A2158.
mla: Freunberger, Stefan Alexander, et al. “Measuring the Current Distribution in
PEFCs with Sub-Millimeter Resolution.” Journal of The Electrochemical Society,
vol. 153, no. 11, A2158, The Electrochemical Society, 2006, doi:10.1149/1.2345591.
short: S.A. Freunberger, M. Reum, J. Evertz, A. Wokaun, F.N. Büchi, Journal of
The Electrochemical Society 153 (2006).
date_created: 2020-01-15T12:23:12Z
date_published: 2006-09-20T00:00:00Z
date_updated: 2021-01-12T08:13:06Z
day: '20'
doi: 10.1149/1.2345591
extern: '1'
intvolume: ' 153'
issue: '11'
language:
- iso: eng
month: '09'
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: Measuring the current distribution in PEFCs with sub-millimeter resolution
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 153
year: '2006'
...
---
_id: '7329'
abstract:
- lang: eng
text: A novel measurement principle for measuring the current distribution in polymer
electrolyte fuel cells (PEFCs) is introduced. It allows, in contrast to all other
known techniques, for the first time for a resolution smaller than the channel/rib
scale of the flow field in PEFCs. The current density is obtained by considering
the electron conductors in the cell as a two-dimensional resistor with the voltage
drop caused by the current. The method was applied to a cell operated on oxygen
up to high current densities. The results show that the ohmic resistances govern
the current distribution in the low current regime, whereas mass transport limitations
hamper the current production under the land at high loads.
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: Mathias
full_name: Reum, Mathias
last_name: Reum
- first_name: Alexander
full_name: Wokaun, Alexander
last_name: Wokaun
- first_name: Felix N.
full_name: Büchi, Felix N.
last_name: Büchi
citation:
ama: Freunberger SA, Reum M, Wokaun A, Büchi FN. Expanding current distribution
measurement in PEFCs to sub-millimeter resolution. Electrochemistry Communications.
2006;8(9):1435-1438. doi:10.1016/j.elecom.2006.05.032
apa: Freunberger, S. A., Reum, M., Wokaun, A., & Büchi, F. N. (2006). Expanding
current distribution measurement in PEFCs to sub-millimeter resolution. Electrochemistry
Communications. Elsevier. https://doi.org/10.1016/j.elecom.2006.05.032
chicago: Freunberger, Stefan Alexander, Mathias Reum, Alexander Wokaun, and Felix
N. Büchi. “Expanding Current Distribution Measurement in PEFCs to Sub-Millimeter
Resolution.” Electrochemistry Communications. Elsevier, 2006. https://doi.org/10.1016/j.elecom.2006.05.032.
ieee: S. A. Freunberger, M. Reum, A. Wokaun, and F. N. Büchi, “Expanding current
distribution measurement in PEFCs to sub-millimeter resolution,” Electrochemistry
Communications, vol. 8, no. 9. Elsevier, pp. 1435–1438, 2006.
ista: Freunberger SA, Reum M, Wokaun A, Büchi FN. 2006. Expanding current distribution
measurement in PEFCs to sub-millimeter resolution. Electrochemistry Communications.
8(9), 1435–1438.
mla: Freunberger, Stefan Alexander, et al. “Expanding Current Distribution Measurement
in PEFCs to Sub-Millimeter Resolution.” Electrochemistry Communications,
vol. 8, no. 9, Elsevier, 2006, pp. 1435–38, doi:10.1016/j.elecom.2006.05.032.
short: S.A. Freunberger, M. Reum, A. Wokaun, F.N. Büchi, Electrochemistry Communications
8 (2006) 1435–1438.
date_created: 2020-01-15T12:23:22Z
date_published: 2006-09-01T00:00:00Z
date_updated: 2021-01-12T08:13:06Z
day: '01'
doi: 10.1016/j.elecom.2006.05.032
extern: '1'
intvolume: ' 8'
issue: '9'
language:
- iso: eng
month: '09'
oa_version: None
page: 1435-1438
publication: Electrochemistry Communications
publication_identifier:
issn:
- 1388-2481
publication_status: published
publisher: Elsevier
quality_controlled: '1'
status: public
title: Expanding current distribution measurement in PEFCs to sub-millimeter resolution
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 8
year: '2006'
...
---
_id: '7330'
abstract:
- lang: eng
text: Polymer electrolyte fuel cells (PE fuel cells) working with air at low stoichiometries
(<2.0) and standard electrochemical components show a high degree of inhomogeneity
in the current density distribution over the active area. An inhomogeneous current
density distribution leads to a non-uniform utilization of the active area, which
could negatively affect the time of life of the cells. Furthermore, it is also
believed to lower cell performance. In this work, the homogenization of the current
density, realized by means of tailored cathodes with along-the-air-channel redistributed
catalyst loadings, is investigated. The air stoichiometry range for which a homogenization
of the current density is achieved depends upon the gradient with which the catalyst
is redistributed along the air channel. A gentle increasing catalyst loading profile
homogenizes the current density at relatively higher air stoichiometries, while
a steeper profile is suited better for lower air stoichiometries. The results
show that a homogenization of the current density by means of redistributed catalyst
loading has negative effects on cell performance. Model calculations corroborate
the experimental findings on homogenization of the current density and deliver
an explanation for the decrease in cell performance.
article_processing_charge: No
article_type: original
author:
- first_name: M.
full_name: Santis, M.
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: A.
full_name: Reiner, A.
last_name: Reiner
- first_name: F.N.
full_name: Büchi, F.N.
last_name: Büchi
citation:
ama: Santis M, Freunberger SA, Reiner A, Büchi FN. Homogenization of the current
density in polymer electrolyte fuel cells by in-plane cathode catalyst gradients.
Electrochimica Acta. 2006;51(25):5383-5393. doi:10.1016/j.electacta.2006.02.008
apa: Santis, M., Freunberger, S. A., Reiner, A., & Büchi, F. N. (2006). Homogenization
of the current density in polymer electrolyte fuel cells by in-plane cathode catalyst
gradients. Electrochimica Acta. Elsevier. https://doi.org/10.1016/j.electacta.2006.02.008
chicago: Santis, M., Stefan Alexander Freunberger, A. Reiner, and F.N. Büchi. “Homogenization
of the Current Density in Polymer Electrolyte Fuel Cells by In-Plane Cathode Catalyst
Gradients.” Electrochimica Acta. Elsevier, 2006. https://doi.org/10.1016/j.electacta.2006.02.008.
ieee: M. Santis, S. A. Freunberger, A. Reiner, and F. N. Büchi, “Homogenization
of the current density in polymer electrolyte fuel cells by in-plane cathode catalyst
gradients,” Electrochimica Acta, vol. 51, no. 25. Elsevier, pp. 5383–5393,
2006.
ista: Santis M, Freunberger SA, Reiner A, Büchi FN. 2006. Homogenization of the
current density in polymer electrolyte fuel cells by in-plane cathode catalyst
gradients. Electrochimica Acta. 51(25), 5383–5393.
mla: Santis, M., et al. “Homogenization of the Current Density in Polymer Electrolyte
Fuel Cells by In-Plane Cathode Catalyst Gradients.” Electrochimica Acta,
vol. 51, no. 25, Elsevier, 2006, pp. 5383–93, doi:10.1016/j.electacta.2006.02.008.
short: M. Santis, S.A. Freunberger, A. Reiner, F.N. Büchi, Electrochimica Acta 51
(2006) 5383–5393.
date_created: 2020-01-15T12:23:34Z
date_published: 2006-07-01T00:00:00Z
date_updated: 2021-01-12T08:13:07Z
day: '01'
doi: 10.1016/j.electacta.2006.02.008
extern: '1'
intvolume: ' 51'
issue: '25'
language:
- iso: eng
month: '07'
oa_version: None
page: 5383-5393
publication: Electrochimica Acta
publication_identifier:
issn:
- 0013-4686
publication_status: published
publisher: Elsevier
quality_controlled: '1'
status: public
title: Homogenization of the current density in polymer electrolyte fuel cells by
in-plane cathode catalyst gradients
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 51
year: '2006'
...
---
_id: '7331'
abstract:
- lang: eng
text: A previously developed mathematical model for water management and current
density distribution in a polymer electrolyte fuel cell (PEFCs) is employed to
investigate the effects of cooling strategies on cell performance. The model describes
a two-dimensional slice through the cell along the channels and through the entire
cell sandwich including the coolant channels and the bipolar plate. Arbitrary
flow arrangements of fuel, oxidant, and coolant stream directions can be described.
Due to the serious impact of temperature on all processes in the PEFC, both the
relative direction of the coolant stream to the gas streams and its mass flow
turns out to significantly affect the cell performance. Besides influencing the
electrochemical reaction and all kinds of mass transfer temperature, variations
predominantly alter the local membrane hydration distribution and subseqently
its conductivity.
article_number: A909
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: Alexander
full_name: Wokaun, Alexander
last_name: Wokaun
- first_name: Felix N.
full_name: Büchi, Felix N.
last_name: Büchi
citation:
ama: 'Freunberger SA, Wokaun A, Büchi FN. In-plane effects in large-scale PEFCs:
II. The influence of cooling strategy on cell performance. Journal of The Electrochemical
Society. 2006;153(5). doi:10.1149/1.2185282'
apa: 'Freunberger, S. A., Wokaun, A., & Büchi, F. N. (2006). In-plane effects
in large-scale PEFCs: II. The influence of cooling strategy on cell performance.
Journal of The Electrochemical Society. The Electrochemical Society. https://doi.org/10.1149/1.2185282'
chicago: 'Freunberger, Stefan Alexander, Alexander Wokaun, and Felix N. Büchi.
“In-Plane Effects in Large-Scale PEFCs: II. The Influence of Cooling Strategy
on Cell Performance.” Journal of The Electrochemical Society. The Electrochemical
Society, 2006. https://doi.org/10.1149/1.2185282.'
ieee: 'S. A. Freunberger, A. Wokaun, and F. N. Büchi, “In-plane effects in large-scale
PEFCs: II. The influence of cooling strategy on cell performance,” Journal
of The Electrochemical Society, vol. 153, no. 5. The Electrochemical Society,
2006.'
ista: 'Freunberger SA, Wokaun A, Büchi FN. 2006. In-plane effects in large-scale
PEFCs: II. The influence of cooling strategy on cell performance. Journal of The
Electrochemical Society. 153(5), A909.'
mla: 'Freunberger, Stefan Alexander, et al. “In-Plane Effects in Large-Scale PEFCs:
II. The Influence of Cooling Strategy on Cell Performance.” Journal of The
Electrochemical Society, vol. 153, no. 5, A909, The Electrochemical Society,
2006, doi:10.1149/1.2185282.'
short: S.A. Freunberger, A. Wokaun, F.N. Büchi, Journal of The Electrochemical
Society 153 (2006).
date_created: 2020-01-15T12:23:46Z
date_published: 2006-03-27T00:00:00Z
date_updated: 2021-01-12T08:13:08Z
day: '27'
doi: 10.1149/1.2185282
extern: '1'
intvolume: ' 153'
issue: '5'
language:
- iso: eng
month: '03'
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: 'In-plane effects in large-scale PEFCs: II. The influence of cooling strategy
on cell performance'
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 153
year: '2006'
...
---
_id: '7332'
abstract:
- lang: eng
text: A quasi-two-dimensional, along-the-channel mass and heat-transfer model for
a proton exchange membrane fuel cell (PEFC) is described and validated against
experimental current distribution data. The model is formulated in a dimensional
manner, i.e., local transport phenomena are treated one-dimensional in through-plane
direction and coupled in-plane by convective transport in the gas and coolant
channels. Thus, a two-dimensional slice running through the repetitive unit of
a cell from the anode channel via membrane-electrode assembly (MEA) and cathode
channel to the coolant channel and from inlet to outlet is modeled. The aim of
the work is to elucidate the influence of operating conditions such as feed gas
humidities and stoichiometric ratios on the along-the-channel current density
distribution and to identify the distinct underlying voltage loss mechanisms.
Furthermore, a complicated technical flow field is modeled by a combination of
co- and counterflow subdomains and compared with experimental current densities.
article_number: A396
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: Marco
full_name: Santis, Marco
last_name: Santis
- 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
citation:
ama: Freunberger SA, Santis M, Schneider IA, Wokaun A, Büchi FN. In-plane effects
in large-scale PEMFCs. Journal of The Electrochemical Society. 2006;153(2).
doi:10.1149/1.2150150
apa: Freunberger, S. A., Santis, M., Schneider, I. A., Wokaun, A., & Büchi,
F. N. (2006). In-plane effects in large-scale PEMFCs. Journal of The Electrochemical
Society. The Electrochemical Society. https://doi.org/10.1149/1.2150150
chicago: Freunberger, Stefan Alexander, Marco Santis, Ingo A. Schneider, Alexander
Wokaun, and Felix N. Büchi. “In-Plane Effects in Large-Scale PEMFCs.” Journal
of The Electrochemical Society. The Electrochemical Society, 2006. https://doi.org/10.1149/1.2150150.
ieee: S. A. Freunberger, M. Santis, I. A. Schneider, A. Wokaun, and F. N. Büchi,
“In-plane effects in large-scale PEMFCs,” Journal of The Electrochemical Society,
vol. 153, no. 2. The Electrochemical Society, 2006.
ista: Freunberger SA, Santis M, Schneider IA, Wokaun A, Büchi FN. 2006. In-plane
effects in large-scale PEMFCs. Journal of The Electrochemical Society. 153(2),
A396.
mla: Freunberger, Stefan Alexander, et al. “In-Plane Effects in Large-Scale PEMFCs.”
Journal of The Electrochemical Society, vol. 153, no. 2, A396, The Electrochemical
Society, 2006, doi:10.1149/1.2150150.
short: S.A. Freunberger, M. Santis, I.A. Schneider, A. Wokaun, F.N. Büchi, Journal
of The Electrochemical Society 153 (2006).
date_created: 2020-01-15T12:24:00Z
date_published: 2006-01-04T00:00:00Z
date_updated: 2021-01-12T08:13:08Z
day: '04'
doi: 10.1149/1.2150150
extern: '1'
intvolume: ' 153'
issue: '2'
language:
- iso: eng
month: '01'
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: In-plane effects in large-scale PEMFCs
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 153
year: '2006'
...
---
_id: '4574'
abstract:
- lang: eng
text: Many software model checkers are based on predicate abstraction. If the verification
goal depends on pointer structures, the approach does not work well, because it
is difficult to find adequate predicate abstractions for the heap. In contrast,
shape analysis, which uses graph-based heap abstractions, can provide a compact
representation of recursive data structures. We integrate shape analysis into
the software model checker Blast. Because shape analysis is expensive, we do not
apply it globally. Instead, we ensure that, like predicates, shape graphs are
computed and stored locally, only where necessary for proving the verification
goal. To achieve this, we extend lazy abstraction refinement, which so far has
been used only for predicate abstractions, to three-valued logical structures.
This approach does not only increase the precision of model checking, but it also
increases the efficiency of shape analysis. We implemented the technique by extending
Blast with calls to Tvla.
alternative_title:
- LNCS
author:
- first_name: Dirk
full_name: Beyer, Dirk
last_name: Beyer
- first_name: Thomas A
full_name: Thomas Henzinger
id: 40876CD8-F248-11E8-B48F-1D18A9856A87
last_name: Henzinger
orcid: 0000−0002−2985−7724
- first_name: Grégory
full_name: Théoduloz, Grégory
last_name: Théoduloz
citation:
ama: 'Beyer D, Henzinger TA, Théoduloz G. Lazy shape analysis. In: Vol 4144. Springer;
2006:532-546. doi:10.1007/11817963_48'
apa: 'Beyer, D., Henzinger, T. A., & Théoduloz, G. (2006). Lazy shape analysis
(Vol. 4144, pp. 532–546). Presented at the CAV: Computer Aided Verification, Springer.
https://doi.org/10.1007/11817963_48'
chicago: Beyer, Dirk, Thomas A Henzinger, and Grégory Théoduloz. “Lazy Shape Analysis,”
4144:532–46. Springer, 2006. https://doi.org/10.1007/11817963_48.
ieee: 'D. Beyer, T. A. Henzinger, and G. Théoduloz, “Lazy shape analysis,” presented
at the CAV: Computer Aided Verification, 2006, vol. 4144, pp. 532–546.'
ista: 'Beyer D, Henzinger TA, Théoduloz G. 2006. Lazy shape analysis. CAV: Computer
Aided Verification, LNCS, vol. 4144, 532–546.'
mla: Beyer, Dirk, et al. Lazy Shape Analysis. Vol. 4144, Springer, 2006,
pp. 532–46, doi:10.1007/11817963_48.
short: D. Beyer, T.A. Henzinger, G. Théoduloz, in:, Springer, 2006, pp. 532–546.
conference:
name: 'CAV: Computer Aided Verification'
date_created: 2018-12-11T12:09:33Z
date_published: 2006-08-08T00:00:00Z
date_updated: 2021-01-12T07:59:49Z
day: '08'
doi: 10.1007/11817963_48
extern: 1
intvolume: ' 4144'
month: '08'
page: 532 - 546
publication_status: published
publisher: Springer
publist_id: '133'
quality_controlled: 0
status: public
title: Lazy shape analysis
type: conference
volume: 4144
year: '2006'
...
---
_id: '573'
abstract:
- lang: eng
text: 'Mitchison and Jozsa recently suggested that the "chained-Zeno"
counterfactual computation protocol recently proposed by Hosten et al. is counterfactual
for only one output of the computer. This claim was based on the existing abstract
algebraic definition of counterfactual computation, and indeed according to this
definition, their argument is correct. However, a more general definition (physically
adequate) for counterfactual computation is implicitly assumed by Hosten et. al.
Here we explain in detail why the protocol is counterfactual and how the "history
tracking" method of the existing description inadequately represents the
physics underlying the protocol. Consequently, we propose a modified definition
of counterfactual computation. Finally, we comment on one of the most interesting
aspects of the error-correcting protocol. '
article_processing_charge: No
arxiv: 1
author:
- first_name: Onur
full_name: Hosten, Onur
id: 4C02D85E-F248-11E8-B48F-1D18A9856A87
last_name: Hosten
orcid: 0000-0002-2031-204X
- first_name: Matthew
full_name: Rakher, Matthew
last_name: Rakher
- first_name: Julio
full_name: Barreiro, Julio
last_name: Barreiro
- first_name: Nicholas
full_name: Peters, Nicholas
last_name: Peters
- first_name: Paul
full_name: Kwiat, Paul
last_name: Kwiat
citation:
ama: Hosten O, Rakher M, Barreiro J, Peters N, Kwiat P. Counterfactual computation
revisited. 2006.
apa: Hosten, O., Rakher, M., Barreiro, J., Peters, N., & Kwiat, P. (2006). Counterfactual
computation revisited. ArXiv.
chicago: Hosten, Onur, Matthew Rakher, Julio Barreiro, Nicholas Peters, and Paul
Kwiat. “Counterfactual Computation Revisited.” ArXiv, 2006.
ieee: O. Hosten, M. Rakher, J. Barreiro, N. Peters, and P. Kwiat, “Counterfactual
computation revisited.” ArXiv, 2006.
ista: Hosten O, Rakher M, Barreiro J, Peters N, Kwiat P. 2006. Counterfactual computation
revisited.
mla: Hosten, Onur, et al. Counterfactual Computation Revisited. ArXiv, 2006.
short: O. Hosten, M. Rakher, J. Barreiro, N. Peters, P. Kwiat, (2006).
date_created: 2018-12-11T11:47:16Z
date_published: 2006-08-06T00:00:00Z
date_updated: 2020-05-12T08:23:52Z
day: '06'
extern: '1'
external_id:
arxiv:
- '0607101'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://arxiv.org/abs/quant-ph/0607101
month: '08'
oa: 1
oa_version: Preprint
page: '12'
publication_status: published
publisher: ArXiv
publist_id: '7241'
status: public
title: Counterfactual computation revisited
type: preprint
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
year: '2006'
...
---
_id: '574'
abstract:
- lang: eng
text: 'Vaidman, in a recent article adopts the method of ''quantum weak measurements
in pre- and postselected ensembles'' to ascertain whether or not the chained-Zeno
counterfactual computation scheme proposed by Hosten et al. is counterfactual;
which has been the topic of a debate on the definition of counterfactuality. We
disagree with his conclusion, which brings up some interesting aspects of quantum
weak measurements and some concerns about the way they are interpreted. '
article_processing_charge: No
arxiv: 1
author:
- first_name: Onur
full_name: Hosten, Onur
id: 4C02D85E-F248-11E8-B48F-1D18A9856A87
last_name: Hosten
orcid: 0000-0002-2031-204X
- first_name: Paul
full_name: Kwiat, Paul
last_name: Kwiat
citation:
ama: Hosten O, Kwiat P. Weak measurements and counterfactual computation. 2006.
apa: Hosten, O., & Kwiat, P. (2006). Weak measurements and counterfactual computation.
ArXiv.
chicago: Hosten, Onur, and Paul Kwiat. “Weak Measurements and Counterfactual Computation.”
ArXiv, 2006.
ieee: O. Hosten and P. Kwiat, “Weak measurements and counterfactual computation.”
ArXiv, 2006.
ista: Hosten O, Kwiat P. 2006. Weak measurements and counterfactual computation.
mla: Hosten, Onur, and Paul Kwiat. Weak Measurements and Counterfactual Computation.
ArXiv, 2006.
short: O. Hosten, P. Kwiat, (2006).
date_created: 2018-12-11T11:47:16Z
date_published: 2006-12-19T00:00:00Z
date_updated: 2020-05-12T08:18:01Z
day: '19'
extern: '1'
external_id:
arxiv:
- '0612159'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://arxiv.org/abs/quant-ph/0612159
month: '12'
oa: 1
oa_version: Preprint
page: '2'
publication_status: published
publisher: ArXiv
publist_id: '7240'
status: public
title: Weak measurements and counterfactual computation
type: preprint
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
year: '2006'
...
---
_id: '577'
abstract:
- lang: eng
text: Visible light photon counters (VLPCs) and solid-state photomultipliers (SSPMs)
are high-efficiency single-photon detectors which have multi-photon counting capability.
While both the VLPCs and the SSPMs have inferred internal quantum efficiencies
above 93%, the actual measured values for both the detectors were in fact limited
to less than 88%, attributed to in-coupling losses. We are currently improving
this overall detection efficiency via a) custom anti-reflection coating the detectors
and the in-coupling fibers, b) implementing a novel cryogenic design to reduce
transmission losses and, c) using low-noise electronics to obtain a better signal-to-noise
ratio.
alternative_title:
- Proceedings of SPIE
author:
- first_name: Radhika
full_name: Rangarajan, Radhika
last_name: Rangarajan
- first_name: Joseph
full_name: Altepeter, Joseph B
last_name: Altepeter
- first_name: Evan
full_name: Jeffrey, Evan R
last_name: Jeffrey
- first_name: Micah
full_name: Stoutimore, Micah J
last_name: Stoutimore
- first_name: Nicholas
full_name: Peters, Nicholas A
last_name: Peters
- first_name: Onur
full_name: Onur Hosten
id: 4C02D85E-F248-11E8-B48F-1D18A9856A87
last_name: Hosten
orcid: 0000-0002-2031-204X
- first_name: Paul
full_name: Kwiat, Paul G
last_name: Kwiat
citation:
ama: 'Rangarajan R, Altepeter J, Jeffrey E, et al. High-efficiency single-photon
detectors. In: Vol 6372. SPIE; 2006. doi:10.1117/12.686117'
apa: Rangarajan, R., Altepeter, J., Jeffrey, E., Stoutimore, M., Peters, N., Hosten,
O., & Kwiat, P. (2006). High-efficiency single-photon detectors (Vol. 6372).
Presented at the Unknown (978-081946470-5), SPIE. https://doi.org/10.1117/12.686117
chicago: Rangarajan, Radhika, Joseph Altepeter, Evan Jeffrey, Micah Stoutimore,
Nicholas Peters, Onur Hosten, and Paul Kwiat. “High-Efficiency Single-Photon Detectors,”
Vol. 6372. SPIE, 2006. https://doi.org/10.1117/12.686117.
ieee: R. Rangarajan et al., “High-efficiency single-photon detectors,” presented
at the Unknown (978-081946470-5), 2006, vol. 6372.
ista: Rangarajan R, Altepeter J, Jeffrey E, Stoutimore M, Peters N, Hosten O, Kwiat
P. 2006. High-efficiency single-photon detectors. Unknown (978-081946470-5), Proceedings
of SPIE, vol. 6372.
mla: Rangarajan, Radhika, et al. High-Efficiency Single-Photon Detectors.
Vol. 6372, SPIE, 2006, doi:10.1117/12.686117.
short: R. Rangarajan, J. Altepeter, E. Jeffrey, M. Stoutimore, N. Peters, O. Hosten,
P. Kwiat, in:, SPIE, 2006.
conference:
name: Unknown (978-081946470-5)
date_created: 2018-12-11T11:47:17Z
date_published: 2006-01-01T00:00:00Z
date_updated: 2020-07-14T12:47:11Z
day: '01'
doi: 10.1117/12.686117
extern: 1
intvolume: ' 6372'
month: '01'
publication_status: published
publisher: SPIE
publist_id: '7233'
quality_controlled: 0
status: public
title: High-efficiency single-photon detectors
type: conference
volume: 6372
year: '2006'
...
---
_id: '578'
abstract:
- lang: eng
text: A source of single photons allows secure quantum key distribution, in addition,
to being a critical resource for linear optics quantum computing. We describe
our progress on deterministically creating single photons from spontaneous parametric
downconversion, an extension of the Pittman, Jacobs and Franson scheme [Phys.
Rev A, v66, 042303 (2002)]. Their idea was to conditionally prepare single photons
by measuring one member of a spontaneously emitted photon pair and storing the
remaining conditionally prepared photon until a predetermined time, when it would
be "deterministically" released from storage. Our approach attempts
to improve upon this by recycling the pump pulse in order to decrease the possibility
of multiple-pair generation, while maintaining a high probability of producing
a single pair. Many of the challenges we discuss are central to other quantum
information technologies, including the need for low-loss optical storage, switching
and detection, and fast feed-forward control.
alternative_title:
- Proc. SPIE
author:
- first_name: Nicholas
full_name: Peters, Nicholas A
last_name: Peters
- first_name: Keith
full_name: Arnold, Keith J
last_name: Arnold
- first_name: Aaron
full_name: VanDevender, Aaron P
last_name: Vandevender
- first_name: Evan
full_name: Jeffrey, Evan R
last_name: Jeffrey
- first_name: Radhika
full_name: Rangarajan, Radhika
last_name: Rangarajan
- first_name: Onur
full_name: Onur Hosten
id: 4C02D85E-F248-11E8-B48F-1D18A9856A87
last_name: Hosten
orcid: 0000-0002-2031-204X
- first_name: Julio
full_name: Barreiro, Julio T
last_name: Barreiro
- first_name: Joseph
full_name: Altepeter, Joseph B
last_name: Altepeter
- first_name: Paul
full_name: Kwiat, Paul G
last_name: Kwiat
citation:
ama: 'Peters N, Arnold K, Vandevender A, et al. Towards a quasi-deterministic single-photon
source. In: Vol 6305. SPIE; 2006. doi:10.1117/12.684702'
apa: Peters, N., Arnold, K., Vandevender, A., Jeffrey, E., Rangarajan, R., Hosten,
O., … Kwiat, P. (2006). Towards a quasi-deterministic single-photon source (Vol.
6305). Presented at the Quantum Communications and Quantum Imaging, SPIE. https://doi.org/10.1117/12.684702
chicago: Peters, Nicholas, Keith Arnold, Aaron Vandevender, Evan Jeffrey, Radhika
Rangarajan, Onur Hosten, Julio Barreiro, Joseph Altepeter, and Paul Kwiat. “Towards
a Quasi-Deterministic Single-Photon Source,” Vol. 6305. SPIE, 2006. https://doi.org/10.1117/12.684702.
ieee: N. Peters et al., “Towards a quasi-deterministic single-photon source,”
presented at the Quantum Communications and Quantum Imaging, 2006, vol. 6305.
ista: Peters N, Arnold K, Vandevender A, Jeffrey E, Rangarajan R, Hosten O, Barreiro
J, Altepeter J, Kwiat P. 2006. Towards a quasi-deterministic single-photon source.
Quantum Communications and Quantum Imaging, Proc. SPIE, vol. 6305.
mla: Peters, Nicholas, et al. Towards a Quasi-Deterministic Single-Photon Source.
Vol. 6305, SPIE, 2006, doi:10.1117/12.684702.
short: N. Peters, K. Arnold, A. Vandevender, E. Jeffrey, R. Rangarajan, O. Hosten,
J. Barreiro, J. Altepeter, P. Kwiat, in:, SPIE, 2006.
conference:
name: Quantum Communications and Quantum Imaging
date_created: 2018-12-11T11:47:17Z
date_published: 2006-01-01T00:00:00Z
date_updated: 2020-07-14T12:47:11Z
day: '01'
doi: 10.1117/12.684702
extern: 1
intvolume: ' 6305'
month: '01'
publication_status: published
publisher: SPIE
publist_id: '7234'
quality_controlled: 0
status: public
title: Towards a quasi-deterministic single-photon source
type: conference
volume: 6305
year: '2006'
...
---
_id: '579'
abstract:
- lang: eng
text: 'The logic underlying the coherent nature of quantum information processing
often deviates from intuitive reasoning, leading to surprising effects. Counterfactual
computation constitutes a striking example: the potential outcome of a quantum
computation can be inferred, even if the computer is not run 1. Relying on similar
arguments to interaction-free measurements 2 (or quantum interrogation3), counterfactual
computation is accomplished by putting the computer in a superposition of ''running''
and ''not running'' states, and then interfering the two histories. Conditional
on the as-yet-unknown outcome of the computation, it is sometimes possible to
counterfactually infer information about the solution. Here we demonstrate counterfactual
computation, implementing Grover''s search algorithm with an all-optical approach4.
It was believed that the overall probability of such counterfactual inference
is intrinsically limited1,5, so that it could not perform better on average than
random guesses. However, using a novel ''chained'' version of the quantum Zeno
effect6, we show how to boost the counterfactual inference probability to unity,
thereby beating the random guessing limit. Our methods are general and apply to
any physical system, as illustrated by a discussion of trapped-ion systems. Finally,
we briefly show that, in certain circumstances, counterfactual computation can
eliminate errors induced by decoherence. '
author:
- first_name: Onur
full_name: Onur Hosten
id: 4C02D85E-F248-11E8-B48F-1D18A9856A87
last_name: Hosten
orcid: 0000-0002-2031-204X
- first_name: Matthew
full_name: Rakher, Matthew T
last_name: Rakher
- first_name: Julio
full_name: Barreiro, Julio T
last_name: Barreiro
- first_name: Nicholas
full_name: Peters, Nicholas A
last_name: Peters
- first_name: Paul
full_name: Kwiat, Paul G
last_name: Kwiat
citation:
ama: Hosten O, Rakher M, Barreiro J, Peters N, Kwiat P. Counterfactual quantum computation
through quantum interrogation. Nature. 2006;439(7079):949-952. doi:10.1038/nature04523
apa: Hosten, O., Rakher, M., Barreiro, J., Peters, N., & Kwiat, P. (2006). Counterfactual
quantum computation through quantum interrogation. Nature. Nature Publishing
Group. https://doi.org/10.1038/nature04523
chicago: Hosten, Onur, Matthew Rakher, Julio Barreiro, Nicholas Peters, and Paul
Kwiat. “Counterfactual Quantum Computation through Quantum Interrogation.” Nature.
Nature Publishing Group, 2006. https://doi.org/10.1038/nature04523.
ieee: O. Hosten, M. Rakher, J. Barreiro, N. Peters, and P. Kwiat, “Counterfactual
quantum computation through quantum interrogation,” Nature, vol. 439, no.
7079. Nature Publishing Group, pp. 949–952, 2006.
ista: Hosten O, Rakher M, Barreiro J, Peters N, Kwiat P. 2006. Counterfactual quantum
computation through quantum interrogation. Nature. 439(7079), 949–952.
mla: Hosten, Onur, et al. “Counterfactual Quantum Computation through Quantum Interrogation.”
Nature, vol. 439, no. 7079, Nature Publishing Group, 2006, pp. 949–52,
doi:10.1038/nature04523.
short: O. Hosten, M. Rakher, J. Barreiro, N. Peters, P. Kwiat, Nature 439 (2006)
949–952.
date_created: 2018-12-11T11:47:18Z
date_published: 2006-02-23T00:00:00Z
date_updated: 2021-01-12T08:03:29Z
day: '23'
doi: 10.1038/nature04523
extern: 1
intvolume: ' 439'
issue: '7079'
month: '02'
page: 949 - 952
publication: Nature
publication_status: published
publisher: Nature Publishing Group
publist_id: '7235'
quality_controlled: 0
status: public
title: Counterfactual quantum computation through quantum interrogation
type: journal_article
volume: 439
year: '2006'
...
---
_id: '583'
abstract:
- lang: eng
text: Visible light photon counters (VLPCs) and solid-state photomultipliers (SSPMs)
facilitate efficient single-photon detection. We are attempting to improve their
efficiency, previously limited to < 88% by coupling losses, via anti-reflection
coatings, better electronics and cryogenics.
author:
- first_name: Radhika
full_name: Rangarajan, Radhika
last_name: Rangarajan
- first_name: Nicholas
full_name: Peters, Nicholas A
last_name: Peters
- first_name: Onur
full_name: Onur Hosten
id: 4C02D85E-F248-11E8-B48F-1D18A9856A87
last_name: Hosten
orcid: 0000-0002-2031-204X
- first_name: Joseph
full_name: Altepeter, Joseph B
last_name: Altepeter
- first_name: Evan
full_name: Jeffrey, Evan R
last_name: Jeffrey
- first_name: Paul
full_name: Kwiat, Paul G
last_name: Kwiat
citation:
ama: 'Rangarajan R, Peters N, Hosten O, Altepeter J, Jeffrey E, Kwiat P. Improved
single-photon detection. In: IEEE; 2006. doi:10.1109/CLEO.2006.4628641'
apa: 'Rangarajan, R., Peters, N., Hosten, O., Altepeter, J., Jeffrey, E., &
Kwiat, P. (2006). Improved single-photon detection. Presented at the CLEO/QELS:
Conference on Lasers and Electro-Optics / Quantum Electronics and Laser Science
Conference, IEEE. https://doi.org/10.1109/CLEO.2006.4628641'
chicago: Rangarajan, Radhika, Nicholas Peters, Onur Hosten, Joseph Altepeter, Evan
Jeffrey, and Paul Kwiat. “Improved Single-Photon Detection.” IEEE, 2006. https://doi.org/10.1109/CLEO.2006.4628641.
ieee: 'R. Rangarajan, N. Peters, O. Hosten, J. Altepeter, E. Jeffrey, and P. Kwiat,
“Improved single-photon detection,” presented at the CLEO/QELS: Conference on
Lasers and Electro-Optics / Quantum Electronics and Laser Science Conference,
2006.'
ista: 'Rangarajan R, Peters N, Hosten O, Altepeter J, Jeffrey E, Kwiat P. 2006.
Improved single-photon detection. CLEO/QELS: Conference on Lasers and Electro-Optics
/ Quantum Electronics and Laser Science Conference.'
mla: Rangarajan, Radhika, et al. Improved Single-Photon Detection. IEEE,
2006, doi:10.1109/CLEO.2006.4628641.
short: R. Rangarajan, N. Peters, O. Hosten, J. Altepeter, E. Jeffrey, P. Kwiat,
in:, IEEE, 2006.
conference:
name: 'CLEO/QELS: Conference on Lasers and Electro-Optics / Quantum Electronics
and Laser Science Conference'
date_created: 2018-12-11T11:47:19Z
date_published: 2006-01-01T00:00:00Z
date_updated: 2021-01-12T08:03:43Z
day: '01'
doi: 10.1109/CLEO.2006.4628641
extern: 1
month: '01'
publication_status: published
publisher: IEEE
publist_id: '7232'
quality_controlled: 0
status: public
title: Improved single-photon detection
type: conference
year: '2006'
...
---
_id: '6151'
author:
- first_name: Iris
full_name: Salecker, Iris
last_name: Salecker
- first_name: Michael
full_name: Häusser, Michael
last_name: Häusser
- first_name: Mario
full_name: de Bono, Mario
id: 4E3FF80E-F248-11E8-B48F-1D18A9856A87
last_name: de Bono
orcid: 0000-0001-8347-0443
citation:
ama: 'Salecker I, Häusser M, de Bono M. On the axonal road to circuit function and
behaviour: Workshop on the assembly and function of neuronal circuits. EMBO
reports. 2006;7(6):585-589. doi:10.1038/sj.embor.7400713'
apa: 'Salecker, I., Häusser, M., & de Bono, M. (2006). On the axonal road to
circuit function and behaviour: Workshop on the assembly and function of neuronal
circuits. EMBO Reports. Wiley. https://doi.org/10.1038/sj.embor.7400713'
chicago: 'Salecker, Iris, Michael Häusser, and Mario de Bono. “On the Axonal Road
to Circuit Function and Behaviour: Workshop on the Assembly and Function of Neuronal
Circuits.” EMBO Reports. Wiley, 2006. https://doi.org/10.1038/sj.embor.7400713.'
ieee: 'I. Salecker, M. Häusser, and M. de Bono, “On the axonal road to circuit function
and behaviour: Workshop on the assembly and function of neuronal circuits,” EMBO
reports, vol. 7, no. 6. Wiley, pp. 585–589, 2006.'
ista: 'Salecker I, Häusser M, de Bono M. 2006. On the axonal road to circuit function
and behaviour: Workshop on the assembly and function of neuronal circuits. EMBO
reports. 7(6), 585–589.'
mla: 'Salecker, Iris, et al. “On the Axonal Road to Circuit Function and Behaviour:
Workshop on the Assembly and Function of Neuronal Circuits.” EMBO Reports,
vol. 7, no. 6, Wiley, 2006, pp. 585–89, doi:10.1038/sj.embor.7400713.'
short: I. Salecker, M. Häusser, M. de Bono, EMBO Reports 7 (2006) 585–589.
date_created: 2019-03-21T08:50:43Z
date_published: 2006-06-01T00:00:00Z
date_updated: 2021-01-12T08:06:23Z
day: '01'
doi: 10.1038/sj.embor.7400713
extern: '1'
external_id:
pmid:
- '16729018'
intvolume: ' 7'
issue: '6'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://europepmc.org/articles/pmc1479602
month: '06'
oa: 1
oa_version: Published Version
page: 585-589
pmid: 1
publication: EMBO reports
publication_identifier:
issn:
- 1469-221X
- 1469-3178
publication_status: published
publisher: Wiley
quality_controlled: '1'
status: public
title: 'On the axonal road to circuit function and behaviour: Workshop on the assembly
and function of neuronal circuits'
type: journal_article
user_id: 3E5EF7F0-F248-11E8-B48F-1D18A9856A87
volume: 7
year: '2006'
...
---
_id: '6152'
author:
- first_name: Candida
full_name: Rogers, Candida
last_name: Rogers
- first_name: Annelie
full_name: Persson, Annelie
last_name: Persson
- first_name: Benny
full_name: Cheung, Benny
last_name: Cheung
- first_name: Mario
full_name: de Bono, Mario
id: 4E3FF80E-F248-11E8-B48F-1D18A9856A87
last_name: de Bono
orcid: 0000-0001-8347-0443
citation:
ama: Rogers C, Persson A, Cheung B, de Bono M. Behavioral motifs and neural pathways
coordinating O2 responses and aggregation in C. elegans. Current Biology.
2006;16(7):649-659. doi:10.1016/j.cub.2006.03.023
apa: Rogers, C., Persson, A., Cheung, B., & de Bono, M. (2006). Behavioral motifs
and neural pathways coordinating O2 responses and aggregation in C. elegans. Current
Biology. Elsevier. https://doi.org/10.1016/j.cub.2006.03.023
chicago: Rogers, Candida, Annelie Persson, Benny Cheung, and Mario de Bono. “Behavioral
Motifs and Neural Pathways Coordinating O2 Responses and Aggregation in C. Elegans.”
Current Biology. Elsevier, 2006. https://doi.org/10.1016/j.cub.2006.03.023.
ieee: C. Rogers, A. Persson, B. Cheung, and M. de Bono, “Behavioral motifs and neural
pathways coordinating O2 responses and aggregation in C. elegans,” Current
Biology, vol. 16, no. 7. Elsevier, pp. 649–659, 2006.
ista: Rogers C, Persson A, Cheung B, de Bono M. 2006. Behavioral motifs and neural
pathways coordinating O2 responses and aggregation in C. elegans. Current Biology.
16(7), 649–659.
mla: Rogers, Candida, et al. “Behavioral Motifs and Neural Pathways Coordinating
O2 Responses and Aggregation in C. Elegans.” Current Biology, vol. 16,
no. 7, Elsevier, 2006, pp. 649–59, doi:10.1016/j.cub.2006.03.023.
short: C. Rogers, A. Persson, B. Cheung, M. de Bono, Current Biology 16 (2006) 649–659.
date_created: 2019-03-21T09:15:27Z
date_published: 2006-04-04T00:00:00Z
date_updated: 2021-01-12T08:06:23Z
day: '04'
doi: 10.1016/j.cub.2006.03.023
extern: '1'
external_id:
pmid:
- '16581509'
intvolume: ' 16'
issue: '7'
language:
- iso: eng
month: '04'
oa_version: None
page: 649-659
pmid: 1
publication: Current Biology
publication_identifier:
issn:
- 0960-9822
publication_status: published
publisher: Elsevier
quality_controlled: '1'
status: public
title: Behavioral motifs and neural pathways coordinating O2 responses and aggregation
in C. elegans
type: journal_article
user_id: 3E5EF7F0-F248-11E8-B48F-1D18A9856A87
volume: 16
year: '2006'
...
---
_id: '1461'
abstract:
- lang: eng
text: This note proves combinatorially that the intersection pairing on the middle-dimensional
compactly supported cohomology of a toric hyperkähler variety is always definite,
providing a large number of non-trivial L 2 harmonic forms for toric hyperkähler
metrics on these varieties. This is motivated by a result of Hitchin about the
definiteness of the pairing of L 2 harmonic forms on complete hyperkähler manifolds
of linear growth.
acknowledgement: The first author was partly supported by NSF grant DMS-0072675. The
second author was partly supported by a VIGRE postdoc under NSF grant number 9983660
to Cornell University.
author:
- first_name: Tamas
full_name: Tamas Hausel
id: 4A0666D8-F248-11E8-B48F-1D18A9856A87
last_name: Hausel
- first_name: Edward
full_name: Swartz, Edward
last_name: Swartz
citation:
ama: Hausel T, Swartz E. Intersection forms of toric hyperkähler varieties. Proceedings
of the American Mathematical Society. 2006;134(8):2403-2409. doi:10.1090/S0002-9939-06-08248-7
apa: Hausel, T., & Swartz, E. (2006). Intersection forms of toric hyperkähler
varieties. Proceedings of the American Mathematical Society. American Mathematical
Society. https://doi.org/10.1090/S0002-9939-06-08248-7
chicago: Hausel, Tamás, and Edward Swartz. “Intersection Forms of Toric Hyperkähler
Varieties.” Proceedings of the American Mathematical Society. American
Mathematical Society, 2006. https://doi.org/10.1090/S0002-9939-06-08248-7.
ieee: T. Hausel and E. Swartz, “Intersection forms of toric hyperkähler varieties,”
Proceedings of the American Mathematical Society, vol. 134, no. 8. American
Mathematical Society, pp. 2403–2409, 2006.
ista: Hausel T, Swartz E. 2006. Intersection forms of toric hyperkähler varieties.
Proceedings of the American Mathematical Society. 134(8), 2403–2409.
mla: Hausel, Tamás, and Edward Swartz. “Intersection Forms of Toric Hyperkähler
Varieties.” Proceedings of the American Mathematical Society, vol. 134,
no. 8, American Mathematical Society, 2006, pp. 2403–09, doi:10.1090/S0002-9939-06-08248-7.
short: T. Hausel, E. Swartz, Proceedings of the American Mathematical Society 134
(2006) 2403–2409.
date_created: 2018-12-11T11:52:09Z
date_published: 2006-08-01T00:00:00Z
date_updated: 2021-01-12T06:50:54Z
day: '01'
doi: 10.1090/S0002-9939-06-08248-7
extern: 1
intvolume: ' 134'
issue: '8'
main_file_link:
- open_access: '1'
url: http://arxiv.org/abs/math/0306369
month: '08'
oa: 1
page: 2403 - 2409
publication: Proceedings of the American Mathematical Society
publication_status: published
publisher: American Mathematical Society
publist_id: '5733'
quality_controlled: 0
status: public
title: Intersection forms of toric hyperkähler varieties
type: journal_article
volume: 134
year: '2006'
...