---
_id: '9684'
abstract:
- lang: eng
text: The size dependence of the strength of nano- and micron-sized crystals is
studied using a new simulation approach in which the dynamics of the density functions
of dislocations are modeled. Since any quantity of dislocations can be represented
by a density, this approach can handle large systems containing large quantities
of dislocations, which may handicap discrete dislocation dynamics schemes due
to the excessive computation time involved. For this reason, pillar sizes spanning
a large range, from the sub-micron to micron regimes, can be simulated. The simulation
results reveal the power-law relationship between strength and specimen size up
to a certain size, beyond which the strength varies much more slowly with size.
For specimens smaller than ~4000b, their strength is found to be controlled by
the dislocation depletion condition, in which the total dislocation density remains
almost constant throughout the loading process. In specimens larger than ~4000b,
the initial dislocation distribution is of critical importance since the presence
of dislocation entanglements is found to obstruct deformation in the neighboring
regions within a distance of ~2000b. This length scale suggests that the effects
of dense dislocation clusters are greater in intermediate-sized specimens (e.g.
4000b and 8000b) than in larger specimens (e.g. 16 000b), according to the weakest-link
concept.
article_number: '035001'
article_processing_charge: No
article_type: original
author:
- first_name: P S S
full_name: Leung, P S S
last_name: Leung
- first_name: H S
full_name: Leung, H S
last_name: Leung
- first_name: Bingqing
full_name: Cheng, Bingqing
id: cbe3cda4-d82c-11eb-8dc7-8ff94289fcc9
last_name: Cheng
orcid: 0000-0002-3584-9632
- first_name: A H W
full_name: Ngan, A H W
last_name: Ngan
citation:
ama: Leung PSS, Leung HS, Cheng B, Ngan AHW. Size dependence of yield strength simulated
by a dislocation-density function dynamics approach. Modelling and Simulation
in Materials Science and Engineering. 2015;23(3). doi:10.1088/0965-0393/23/3/035001
apa: Leung, P. S. S., Leung, H. S., Cheng, B., & Ngan, A. H. W. (2015). Size
dependence of yield strength simulated by a dislocation-density function dynamics
approach. Modelling and Simulation in Materials Science and Engineering.
IOP Publishing. https://doi.org/10.1088/0965-0393/23/3/035001
chicago: Leung, P S S, H S Leung, Bingqing Cheng, and A H W Ngan. “Size Dependence
of Yield Strength Simulated by a Dislocation-Density Function Dynamics Approach.”
Modelling and Simulation in Materials Science and Engineering. IOP Publishing,
2015. https://doi.org/10.1088/0965-0393/23/3/035001.
ieee: P. S. S. Leung, H. S. Leung, B. Cheng, and A. H. W. Ngan, “Size dependence
of yield strength simulated by a dislocation-density function dynamics approach,”
Modelling and Simulation in Materials Science and Engineering, vol. 23,
no. 3. IOP Publishing, 2015.
ista: Leung PSS, Leung HS, Cheng B, Ngan AHW. 2015. Size dependence of yield strength
simulated by a dislocation-density function dynamics approach. Modelling and Simulation
in Materials Science and Engineering. 23(3), 035001.
mla: Leung, P. S. S., et al. “Size Dependence of Yield Strength Simulated by a Dislocation-Density
Function Dynamics Approach.” Modelling and Simulation in Materials Science
and Engineering, vol. 23, no. 3, 035001, IOP Publishing, 2015, doi:10.1088/0965-0393/23/3/035001.
short: P.S.S. Leung, H.S. Leung, B. Cheng, A.H.W. Ngan, Modelling and Simulation
in Materials Science and Engineering 23 (2015).
date_created: 2021-07-19T09:11:12Z
date_published: 2015-04-01T00:00:00Z
date_updated: 2023-02-23T14:04:54Z
day: '01'
doi: 10.1088/0965-0393/23/3/035001
extern: '1'
intvolume: ' 23'
issue: '3'
language:
- iso: eng
month: '04'
oa_version: None
publication: Modelling and Simulation in Materials Science and Engineering
publication_identifier:
eissn:
- 1361-651X
issn:
- 0965-0393
publication_status: published
publisher: IOP Publishing
quality_controlled: '1'
scopus_import: '1'
status: public
title: Size dependence of yield strength simulated by a dislocation-density function
dynamics approach
type: journal_article
user_id: 6785fbc1-c503-11eb-8a32-93094b40e1cf
volume: 23
year: '2015'
...
---
_id: '9688'
abstract:
- lang: eng
text: The properties of the interface between solid and melt are key to solidification
and melting, as the interfacial free energy introduces a kinetic barrier to phase
transitions. This makes solidification happen below the melting temperature, in
out-of-equilibrium conditions at which the interfacial free energy is ill defined.
Here we draw a connection between the atomistic description of a diffuse solid-liquid
interface and its thermodynamic characterization. This framework resolves the
ambiguities in defining the solid-liquid interfacial free energy above and below
the melting temperature. In addition, we introduce a simulation protocol that
allows solid-liquid interfaces to be reversibly created and destroyed at conditions
relevant for experiments. We directly evaluate the value of the interfacial free
energy away from the melting point for a simple but realistic atomic potential,
and find a more complex temperature dependence than the constant positive slope
that has been generally assumed based on phenomenological considerations and that
has been used to interpret experiments. This methodology could be easily extended
to the study of other phase transitions, from condensation to precipitation. Our
analysis can help reconcile the textbook picture of classical nucleation theory
with the growing body of atomistic studies and mesoscale models of solidification.
article_number: '180102'
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: Bingqing
full_name: Cheng, Bingqing
id: cbe3cda4-d82c-11eb-8dc7-8ff94289fcc9
last_name: Cheng
orcid: 0000-0002-3584-9632
- first_name: Gareth A.
full_name: Tribello, Gareth A.
last_name: Tribello
- first_name: Michele
full_name: Ceriotti, Michele
last_name: Ceriotti
citation:
ama: Cheng B, Tribello GA, Ceriotti M. Solid-liquid interfacial free energy out
of equilibrium. Physical Review B - Condensed Matter and Materials Physics.
2015;92(18). doi:10.1103/physrevb.92.180102
apa: Cheng, B., Tribello, G. A., & Ceriotti, M. (2015). Solid-liquid interfacial
free energy out of equilibrium. Physical Review B - Condensed Matter and Materials
Physics. American Physical Society. https://doi.org/10.1103/physrevb.92.180102
chicago: Cheng, Bingqing, Gareth A. Tribello, and Michele Ceriotti. “Solid-Liquid
Interfacial Free Energy out of Equilibrium.” Physical Review B - Condensed
Matter and Materials Physics. American Physical Society, 2015. https://doi.org/10.1103/physrevb.92.180102.
ieee: B. Cheng, G. A. Tribello, and M. Ceriotti, “Solid-liquid interfacial free
energy out of equilibrium,” Physical Review B - Condensed Matter and Materials
Physics, vol. 92, no. 18. American Physical Society, 2015.
ista: Cheng B, Tribello GA, Ceriotti M. 2015. Solid-liquid interfacial free energy
out of equilibrium. Physical Review B - Condensed Matter and Materials Physics.
92(18), 180102.
mla: Cheng, Bingqing, et al. “Solid-Liquid Interfacial Free Energy out of Equilibrium.”
Physical Review B - Condensed Matter and Materials Physics, vol. 92, no.
18, 180102, American Physical Society, 2015, doi:10.1103/physrevb.92.180102.
short: B. Cheng, G.A. Tribello, M. Ceriotti, Physical Review B - Condensed Matter
and Materials Physics 92 (2015).
date_created: 2021-07-19T10:07:22Z
date_published: 2015-11-01T00:00:00Z
date_updated: 2021-08-09T12:38:49Z
day: '01'
doi: 10.1103/physrevb.92.180102
extern: '1'
external_id:
arxiv:
- '1511.08668'
intvolume: ' 92'
issue: '18'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://arxiv.org/abs/1511.08668
month: '11'
oa: 1
oa_version: Preprint
publication: Physical Review B - Condensed Matter and Materials Physics
publication_identifier:
eissn:
- 1550-235X
issn:
- 1098-0121
publication_status: published
publisher: American Physical Society
quality_controlled: '1'
scopus_import: '1'
status: public
title: Solid-liquid interfacial free energy out of equilibrium
type: journal_article
user_id: 6785fbc1-c503-11eb-8a32-93094b40e1cf
volume: 92
year: '2015'
...
---
_id: '11837'
abstract:
- lang: eng
text: "Online social networks allow the collection of large amounts of data about
the influence between users connected by a friendship-like relationship. When
distributing items among agents forming a social network, this information allows
us to exploit network externalities that each agent receives from his neighbors
that get the same item. In this paper we consider Friends-of-Friends (2-hop) network
externalities, i.e., externalities that not only depend on the neighbors that
get the same item but also on neighbors of neighbors. For these externalities
we study a setting where multiple different items are assigned to unit-demand
agents. Specifically, we study the problem of welfare maximization under different
types of externality functions. Let n be the number of agents and m be the number
of items. Our contributions are the following: (1) We show that welfare maximization
is APX-hard; we show that even for step functions with 2-hop (and also with 1-hop)
externalities it is NP-hard to approximate social welfare better than (1-1/e).
(2) On the positive side we present (i) an O(sqrt n)-approximation algorithm for
general concave externality functions,\r\n(ii) an O(\\log m)-approximation algorithm
for linear externality functions, and (iii) an (1-1/e)\\frac{1}{6}-approximation
algorithm for 2-hop step function externalities. We also improve the result from
[6] for 1-hop step function externalities by giving a (1-1/e)/2-approximation
algorithm."
alternative_title:
- LIPIcs
article_processing_charge: No
author:
- first_name: Sayan
full_name: Bhattacharya, Sayan
last_name: Bhattacharya
- first_name: Wolfgang
full_name: Dvorák, Wolfgang
last_name: Dvorák
- first_name: Monika H
full_name: Henzinger, Monika H
id: 540c9bbd-f2de-11ec-812d-d04a5be85630
last_name: Henzinger
orcid: 0000-0002-5008-6530
- first_name: ' Martin'
full_name: Starnberger, Martin
last_name: Starnberger
citation:
ama: 'Bhattacharya S, Dvorák W, Henzinger MH, Starnberger Martin. Welfare maximization
with friends-of-friends network externalities. In: 32nd International Symposium
on Theoretical Aspects of Computer Science. Vol 30. Schloss Dagstuhl - Leibniz-Zentrum
für Informatik; 2015:90-102. doi:10.4230/LIPICS.STACS.2015.90'
apa: 'Bhattacharya, S., Dvorák, W., Henzinger, M. H., & Starnberger, Martin.
(2015). Welfare maximization with friends-of-friends network externalities. In
32nd International Symposium on Theoretical Aspects of Computer Science
(Vol. 30, pp. 90–102). Garching, Germany: Schloss Dagstuhl - Leibniz-Zentrum für
Informatik. https://doi.org/10.4230/LIPICS.STACS.2015.90'
chicago: Bhattacharya, Sayan, Wolfgang Dvorák, Monika H Henzinger, and Martin Starnberger.
“Welfare Maximization with Friends-of-Friends Network Externalities.” In 32nd
International Symposium on Theoretical Aspects of Computer Science, 30:90–102.
Schloss Dagstuhl - Leibniz-Zentrum für Informatik, 2015. https://doi.org/10.4230/LIPICS.STACS.2015.90.
ieee: S. Bhattacharya, W. Dvorák, M. H. Henzinger, and Martin Starnberger, “Welfare
maximization with friends-of-friends network externalities,” in 32nd International
Symposium on Theoretical Aspects of Computer Science, Garching, Germany, 2015,
vol. 30, pp. 90–102.
ista: 'Bhattacharya S, Dvorák W, Henzinger MH, Starnberger Martin. 2015. Welfare
maximization with friends-of-friends network externalities. 32nd International
Symposium on Theoretical Aspects of Computer Science. STACS: Symposium on Theoretical
Aspects of Computer Science, LIPIcs, vol. 30, 90–102.'
mla: Bhattacharya, Sayan, et al. “Welfare Maximization with Friends-of-Friends Network
Externalities.” 32nd International Symposium on Theoretical Aspects of Computer
Science, vol. 30, Schloss Dagstuhl - Leibniz-Zentrum für Informatik, 2015,
pp. 90–102, doi:10.4230/LIPICS.STACS.2015.90.
short: S. Bhattacharya, W. Dvorák, M.H. Henzinger, Martin Starnberger, in:, 32nd
International Symposium on Theoretical Aspects of Computer Science, Schloss Dagstuhl
- Leibniz-Zentrum für Informatik, 2015, pp. 90–102.
conference:
end_date: 2015-03-07
location: Garching, Germany
name: 'STACS: Symposium on Theoretical Aspects of Computer Science'
start_date: 2015-03-04
date_created: 2022-08-12T11:39:40Z
date_published: 2015-02-26T00:00:00Z
date_updated: 2023-02-21T16:32:37Z
day: '26'
doi: 10.4230/LIPICS.STACS.2015.90
extern: '1'
intvolume: ' 30'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.4230/LIPICS.STACS.2015.90
month: '02'
oa: 1
oa_version: Published Version
page: 90-102
publication: 32nd International Symposium on Theoretical Aspects of Computer Science
publication_identifier:
isbn:
- 978-3-939897-78-1
issn:
- 1868-8969
publication_status: published
publisher: Schloss Dagstuhl - Leibniz-Zentrum für Informatik
quality_controlled: '1'
related_material:
record:
- id: '11903'
relation: later_version
status: public
scopus_import: '1'
status: public
title: Welfare maximization with friends-of-friends network externalities
type: conference
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 30
year: '2015'
...
---
_id: '11845'
abstract:
- lang: eng
text: "Phylogenetic diversity (PD) is a measure of biodiversity based on the evolutionary
history of species. Here, we discuss several optimization problems related to
the use of PD, and the more general measure split diversity (SD), in conservation
prioritization.\r\nDepending on the conservation goal and the information available
about species, one can construct optimization routines that incorporate various
conservation constraints. We demonstrate how this information can be used to select
sets of species for conservation action. Specifically, we discuss the use of species'
geographic distributions, the choice of candidates under economic pressure, and
the use of predator–prey interactions between the species in a community to define
viability constraints.\r\nDespite such optimization problems falling into the
area of NP hard problems, it is possible to solve them in a reasonable amount
of time using integer programming. We apply integer linear programming to a variety
of models for conservation prioritization that incorporate the SD measure.\r\nWe
exemplarily show the results for two data sets: the Cape region of South Africa
and a Caribbean coral reef community. Finally, we provide user-friendly software
at http://www.cibiv.at/software/pda."
article_processing_charge: No
article_type: original
author:
- first_name: Olga
full_name: Chernomor, Olga
last_name: Chernomor
- first_name: Bui Quang
full_name: Minh, Bui Quang
last_name: Minh
- first_name: Félix
full_name: Forest, Félix
last_name: Forest
- first_name: Steffen
full_name: Klaere, Steffen
last_name: Klaere
- first_name: Travis
full_name: Ingram, Travis
last_name: Ingram
- first_name: Monika H
full_name: Henzinger, Monika H
id: 540c9bbd-f2de-11ec-812d-d04a5be85630
last_name: Henzinger
orcid: 0000-0002-5008-6530
- first_name: Arndt
full_name: von Haeseler, Arndt
last_name: von Haeseler
citation:
ama: Chernomor O, Minh BQ, Forest F, et al. Split diversity in constrained conservation
prioritization using integer linear programming. Methods in Ecology and Evolution.
2015;6(1):83-91. doi:10.1111/2041-210x.12299
apa: Chernomor, O., Minh, B. Q., Forest, F., Klaere, S., Ingram, T., Henzinger,
M. H., & von Haeseler, A. (2015). Split diversity in constrained conservation
prioritization using integer linear programming. Methods in Ecology and Evolution.
Wiley. https://doi.org/10.1111/2041-210x.12299
chicago: Chernomor, Olga, Bui Quang Minh, Félix Forest, Steffen Klaere, Travis Ingram,
Monika H Henzinger, and Arndt von Haeseler. “Split Diversity in Constrained Conservation
Prioritization Using Integer Linear Programming.” Methods in Ecology and Evolution.
Wiley, 2015. https://doi.org/10.1111/2041-210x.12299.
ieee: O. Chernomor et al., “Split diversity in constrained conservation prioritization
using integer linear programming,” Methods in Ecology and Evolution, vol.
6, no. 1. Wiley, pp. 83–91, 2015.
ista: Chernomor O, Minh BQ, Forest F, Klaere S, Ingram T, Henzinger MH, von Haeseler
A. 2015. Split diversity in constrained conservation prioritization using integer
linear programming. Methods in Ecology and Evolution. 6(1), 83–91.
mla: Chernomor, Olga, et al. “Split Diversity in Constrained Conservation Prioritization
Using Integer Linear Programming.” Methods in Ecology and Evolution, vol.
6, no. 1, Wiley, 2015, pp. 83–91, doi:10.1111/2041-210x.12299.
short: O. Chernomor, B.Q. Minh, F. Forest, S. Klaere, T. Ingram, M.H. Henzinger,
A. von Haeseler, Methods in Ecology and Evolution 6 (2015) 83–91.
date_created: 2022-08-16T06:43:49Z
date_published: 2015-01-01T00:00:00Z
date_updated: 2023-02-17T09:30:08Z
day: '01'
ddc:
- '570'
doi: 10.1111/2041-210x.12299
extern: '1'
external_id:
pmid:
- '25893087'
file:
- access_level: open_access
checksum: 880e78f09f0ac99cb351c48dc97623b6
content_type: application/pdf
creator: asandaue
date_created: 2022-08-16T06:52:53Z
date_updated: 2022-08-16T06:52:53Z
file_id: '11846'
file_name: 2015_MethodsInEcologyAndEvolutionChernomor.pdf
file_size: 411415
relation: main_file
success: 1
file_date_updated: 2022-08-16T06:52:53Z
has_accepted_license: '1'
intvolume: ' 6'
issue: '1'
language:
- iso: eng
license: https://creativecommons.org/licenses/by/4.0/
month: '01'
oa: 1
oa_version: Published Version
page: 83-91
pmid: 1
publication: Methods in Ecology and Evolution
publication_identifier:
eissn:
- 2041-210X
publication_status: published
publisher: Wiley
quality_controlled: '1'
scopus_import: '1'
status: public
title: Split diversity in constrained conservation prioritization using integer linear
programming
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
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 6
year: '2015'
...
---
_id: '11868'
abstract:
- lang: eng
text: "Consider the following Online Boolean Matrix-Vector Multiplication problem:
We are given an n x n matrix M and will receive n column-vectors of size n, denoted
by v1, ..., vn, one by one. After seeing each vector vi, we have to output the
product Mvi before we can see the next vector. A naive algorithm can solve this
problem using O(n3) time in total, and its running time can be slightly improved
to O(n3/log2 n) [Williams SODA'07]. We show that a conjecture that there is no
truly subcubic (O(n3-ε)) time algorithm for this problem can be used to exhibit
the underlying polynomial time hardness shared by many dynamic problems. For a
number of problems, such as subgraph connectivity, Pagh's problem, d-failure connectivity,
decremental single-source shortest paths, and decremental transitive closure,
this conjecture implies tight hardness results. Thus, proving or disproving this
conjecture will be very interesting as it will either imply several tight unconditional
lower bounds or break through a common barrier that blocks progress with these
problems. This conjecture might also be considered as strong evidence against
any further improvement for these problems since refuting it will imply a major
breakthrough for combinatorial Boolean matrix multiplication and other long-standing
problems if the term \"combinatorial algorithms\" is interpreted as \"Strassen-like
algorithms\" [Ballard et al. SPAA'11].\r\n\r\nThe conjecture also leads to hardness
results for problems that were previously based on diverse problems and conjectures
-- such as 3SUM, combinatorial Boolean matrix multiplication, triangle detection,
and multiphase -- thus providing a uniform way to prove polynomial hardness results
for dynamic algorithms; some of the new proofs are also simpler or even become
trivial. The conjecture also leads to stronger and new, non-trivial, hardness
results, e.g., for the fully-dynamic densest subgraph and diameter problems."
article_number: 21-30
article_processing_charge: No
arxiv: 1
author:
- first_name: Monika H
full_name: Henzinger, Monika H
id: 540c9bbd-f2de-11ec-812d-d04a5be85630
last_name: Henzinger
orcid: 0000-0002-5008-6530
- first_name: Sebastian
full_name: Krinninger, Sebastian
last_name: Krinninger
- first_name: Danupon
full_name: Nanongkai, Danupon
last_name: Nanongkai
- first_name: Thatchaphol
full_name: Saranurak, Thatchaphol
last_name: Saranurak
citation:
ama: 'Henzinger MH, Krinninger S, Nanongkai D, Saranurak T. Unifying and strengthening
hardness for dynamic problems via the online matrix-vector multiplication conjecture.
In: 47th Annual ACM Symposium on Theory of Computing. Association for Computing
Machinery; 2015. doi:10.1145/2746539.2746609'
apa: 'Henzinger, M. H., Krinninger, S., Nanongkai, D., & Saranurak, T. (2015).
Unifying and strengthening hardness for dynamic problems via the online matrix-vector
multiplication conjecture. In 47th Annual ACM Symposium on Theory of Computing.
Portland, OR, United States: Association for Computing Machinery. https://doi.org/10.1145/2746539.2746609'
chicago: Henzinger, Monika H, Sebastian Krinninger, Danupon Nanongkai, and Thatchaphol
Saranurak. “Unifying and Strengthening Hardness for Dynamic Problems via the Online
Matrix-Vector Multiplication Conjecture.” In 47th Annual ACM Symposium on Theory
of Computing. Association for Computing Machinery, 2015. https://doi.org/10.1145/2746539.2746609.
ieee: M. H. Henzinger, S. Krinninger, D. Nanongkai, and T. Saranurak, “Unifying
and strengthening hardness for dynamic problems via the online matrix-vector multiplication
conjecture,” in 47th Annual ACM Symposium on Theory of Computing, Portland,
OR, United States, 2015.
ista: 'Henzinger MH, Krinninger S, Nanongkai D, Saranurak T. 2015. Unifying and
strengthening hardness for dynamic problems via the online matrix-vector multiplication
conjecture. 47th Annual ACM Symposium on Theory of Computing. STOC: Symposium
on Theory of Computing, 21–30.'
mla: Henzinger, Monika H., et al. “Unifying and Strengthening Hardness for Dynamic
Problems via the Online Matrix-Vector Multiplication Conjecture.” 47th Annual
ACM Symposium on Theory of Computing, 21–30, Association for Computing Machinery,
2015, doi:10.1145/2746539.2746609.
short: M.H. Henzinger, S. Krinninger, D. Nanongkai, T. Saranurak, in:, 47th Annual
ACM Symposium on Theory of Computing, Association for Computing Machinery, 2015.
conference:
end_date: 2015-06-17
location: Portland, OR, United States
name: 'STOC: Symposium on Theory of Computing'
start_date: 2015-06-14
date_created: 2022-08-16T09:31:21Z
date_published: 2015-06-14T00:00:00Z
date_updated: 2023-02-17T11:09:54Z
day: '14'
doi: 10.1145/2746539.2746609
extern: '1'
external_id:
arxiv:
- '1511.06773'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://arxiv.org/abs/1511.06773
month: '06'
oa: 1
oa_version: Preprint
publication: 47th Annual ACM Symposium on Theory of Computing
publication_identifier:
isbn:
- 978-145033536-2
issn:
- '0737.8017'
publication_status: published
publisher: Association for Computing Machinery
quality_controlled: '1'
scopus_import: '1'
status: public
title: Unifying and strengthening hardness for dynamic problems via the online matrix-vector
multiplication conjecture
type: conference
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
year: '2015'
...
---
_id: '11869'
abstract:
- lang: eng
text: "While in many graph mining applications it is crucial to handle a stream
of updates efficiently in terms of both time and space, not much was known about
achieving such type of algorithm. In this paper we study this issue for a problem
which lies at the core of many graph mining applications called densest subgraph
problem. We develop an algorithm that achieves time- and space-efficiency for
this problem simultaneously. It is one of the first of its kind for graph problems
to the best of our knowledge.\r\n\r\nGiven an input graph, the densest subgraph
is the subgraph that maximizes the ratio between the number of edges and the number
of nodes. For any ε>0, our algorithm can, with high probability, maintain a (4+ε)-approximate
solution under edge insertions and deletions using ~O(n) space and ~O(1) amortized
time per update; here, $n$ is the number of nodes in the graph and ~O hides the
O(polylog_{1+ε} n) term. The approximation ratio can be improved to (2+ε) with
more time. It can be extended to a (2+ε)-approximation sublinear-time algorithm
and a distributed-streaming algorithm. Our algorithm is the first streaming algorithm
that can maintain the densest subgraph in one pass. Prior to this, no algorithm
could do so even in the special case of an incremental stream and even when there
is no time restriction. The previously best algorithm in this setting required
O(log n) passes [BahmaniKV12]. The space required by our algorithm is tight up
to a polylogarithmic factor."
article_processing_charge: No
arxiv: 1
author:
- first_name: Sayan
full_name: Bhattacharya, Sayan
last_name: Bhattacharya
- first_name: Monika H
full_name: Henzinger, Monika H
id: 540c9bbd-f2de-11ec-812d-d04a5be85630
last_name: Henzinger
orcid: 0000-0002-5008-6530
- first_name: Danupon
full_name: Nanongkai, Danupon
last_name: Nanongkai
- first_name: Charalampos
full_name: Tsourakakis, Charalampos
last_name: Tsourakakis
citation:
ama: 'Bhattacharya S, Henzinger MH, Nanongkai D, Tsourakakis C. Space- and time-efficient
algorithm for maintaining dense subgraphs on one-pass dynamic streams. In: 47th
Annual ACM Symposium on Theory of Computing. Association for Computing Machinery;
2015:173-182. doi:10.1145/2746539.2746592'
apa: 'Bhattacharya, S., Henzinger, M. H., Nanongkai, D., & Tsourakakis, C. (2015).
Space- and time-efficient algorithm for maintaining dense subgraphs on one-pass
dynamic streams. In 47th Annual ACM Symposium on Theory of Computing (pp.
173–182). Portland, OR, United States: Association for Computing Machinery. https://doi.org/10.1145/2746539.2746592'
chicago: Bhattacharya, Sayan, Monika H Henzinger, Danupon Nanongkai, and Charalampos
Tsourakakis. “Space- and Time-Efficient Algorithm for Maintaining Dense Subgraphs
on One-Pass Dynamic Streams.” In 47th Annual ACM Symposium on Theory of Computing,
173–82. Association for Computing Machinery, 2015. https://doi.org/10.1145/2746539.2746592.
ieee: S. Bhattacharya, M. H. Henzinger, D. Nanongkai, and C. Tsourakakis, “Space-
and time-efficient algorithm for maintaining dense subgraphs on one-pass dynamic
streams,” in 47th Annual ACM Symposium on Theory of Computing, Portland,
OR, United States, 2015, pp. 173–182.
ista: 'Bhattacharya S, Henzinger MH, Nanongkai D, Tsourakakis C. 2015. Space- and
time-efficient algorithm for maintaining dense subgraphs on one-pass dynamic streams.
47th Annual ACM Symposium on Theory of Computing. STOC: Symposium on Theory of
Computing, 173–182.'
mla: Bhattacharya, Sayan, et al. “Space- and Time-Efficient Algorithm for Maintaining
Dense Subgraphs on One-Pass Dynamic Streams.” 47th Annual ACM Symposium on
Theory of Computing, Association for Computing Machinery, 2015, pp. 173–82,
doi:10.1145/2746539.2746592.
short: S. Bhattacharya, M.H. Henzinger, D. Nanongkai, C. Tsourakakis, in:, 47th
Annual ACM Symposium on Theory of Computing, Association for Computing Machinery,
2015, pp. 173–182.
conference:
end_date: 2015-06-17
location: Portland, OR, United States
name: 'STOC: Symposium on Theory of Computing'
start_date: 2015-06-14
date_created: 2022-08-16T09:36:48Z
date_published: 2015-06-01T00:00:00Z
date_updated: 2023-02-17T11:17:03Z
day: '01'
doi: 10.1145/2746539.2746592
extern: '1'
external_id:
arxiv:
- '1504.02268'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://arxiv.org/abs/1504.02268
month: '06'
oa: 1
oa_version: Preprint
page: 173 - 182
publication: 47th Annual ACM Symposium on Theory of Computing
publication_identifier:
isbn:
- 978-145033536-2
issn:
- 0737-8017
publication_status: published
publisher: Association for Computing Machinery
quality_controlled: '1'
scopus_import: '1'
status: public
title: Space- and time-efficient algorithm for maintaining dense subgraphs on one-pass
dynamic streams
type: conference
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
year: '2015'
...
---
_id: '11901'
abstract:
- lang: eng
text: We consider auctions of indivisible items to unit-demand bidders with budgets.
This setting was suggested as an expressive model for single sponsored search
auctions. Prior work presented mechanisms that compute bidder-optimal outcomes
and are truthful for a restricted set of inputs, i.e., inputs in so-called general
position. This condition is easily violated. We provide the first mechanism that
is truthful in expectation for all inputs and achieves for each bidder no worse
utility than the bidder-optimal outcome. Additionally we give a complete characterization
for which inputs mechanisms that compute bidder-optimal outcomes are truthful.
article_processing_charge: No
article_type: original
author:
- first_name: Monika H
full_name: Henzinger, Monika H
id: 540c9bbd-f2de-11ec-812d-d04a5be85630
last_name: Henzinger
orcid: 0000-0002-5008-6530
- first_name: Veronika
full_name: Loitzenbauer, Veronika
last_name: Loitzenbauer
citation:
ama: Henzinger MH, Loitzenbauer V. Truthful unit-demand auctions with budgets revisited.
Theoretical Computer Science. 2015;573:1-15. doi:10.1016/j.tcs.2015.01.033
apa: Henzinger, M. H., & Loitzenbauer, V. (2015). Truthful unit-demand auctions
with budgets revisited. Theoretical Computer Science. Elsevier. https://doi.org/10.1016/j.tcs.2015.01.033
chicago: Henzinger, Monika H, and Veronika Loitzenbauer. “Truthful Unit-Demand Auctions
with Budgets Revisited.” Theoretical Computer Science. Elsevier, 2015.
https://doi.org/10.1016/j.tcs.2015.01.033.
ieee: M. H. Henzinger and V. Loitzenbauer, “Truthful unit-demand auctions with budgets
revisited,” Theoretical Computer Science, vol. 573. Elsevier, pp. 1–15,
2015.
ista: Henzinger MH, Loitzenbauer V. 2015. Truthful unit-demand auctions with budgets
revisited. Theoretical Computer Science. 573, 1–15.
mla: Henzinger, Monika H., and Veronika Loitzenbauer. “Truthful Unit-Demand Auctions
with Budgets Revisited.” Theoretical Computer Science, vol. 573, Elsevier,
2015, pp. 1–15, doi:10.1016/j.tcs.2015.01.033.
short: M.H. Henzinger, V. Loitzenbauer, Theoretical Computer Science 573 (2015)
1–15.
date_created: 2022-08-17T09:06:53Z
date_published: 2015-03-30T00:00:00Z
date_updated: 2023-02-17T14:50:04Z
day: '30'
doi: 10.1016/j.tcs.2015.01.033
extern: '1'
intvolume: ' 573'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.1016/j.tcs.2015.01.033
month: '03'
oa: 1
oa_version: None
page: 1-15
publication: Theoretical Computer Science
publication_identifier:
issn:
- 0304-3975
publication_status: published
publisher: Elsevier
quality_controlled: '1'
scopus_import: '1'
status: public
title: Truthful unit-demand auctions with budgets revisited
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 573
year: '2015'
...
---
_id: '11962'
abstract:
- lang: eng
text: One of the rare alternative reagents for the reduction of carbon–carbon double
bonds is diimide (HNNH), which can be generated in situ from hydrazine hydrate
(N2H4⋅H2O) and O2. Although this selective method is extremely clean and powerful,
it is rarely used, as the rate-determining oxidation of hydrazine in the absence
of a catalyst is relatively slow using conventional batch protocols. A continuous
high-temperature/high-pressure methodology dramatically enhances the initial oxidation
step, at the same time allowing for a safe and scalable processing of the hazardous
reaction mixture. Simple alkenes can be selectively reduced within 10–20 min at
100–120 °C and 20 bar O2 pressure. The development of a multi-injection reactor
platform for the periodic addition of N2H4⋅H2O enables the reduction of less reactive
olefins even at lower reaction temperatures. This concept was utilized for the
highly selective reduction of artemisinic acid to dihydroartemisinic acid, the
precursor molecule for the semisynthesis of the antimalarial drug artemisinin.
The industrially relevant reduction was achieved by using four consecutive liquid
feeds (of N2H4⋅H2O) and residence time units resulting in a highly selective reduction
within approximately 40 min at 60 °C and 20 bar O2 pressure, providing dihydroartemisinic
acid in ≥93 % yield and ≥95 % selectivity.
article_processing_charge: No
article_type: original
author:
- first_name: Bartholomäus
full_name: Pieber, Bartholomäus
id: 93e5e5b2-0da6-11ed-8a41-af589a024726
last_name: Pieber
orcid: 0000-0001-8689-388X
- first_name: Toma
full_name: Glasnov, Toma
last_name: Glasnov
- first_name: C. Oliver
full_name: Kappe, C. Oliver
last_name: Kappe
citation:
ama: Pieber B, Glasnov T, Kappe CO. Continuous flow reduction of artemisinic acid
utilizing multi-injection strategies-closing the gap towards a fully continuous
synthesis of antimalarial drugs. Chemistry - A European Journal. 2015;21(11):4368-4376.
doi:10.1002/chem.201406439
apa: Pieber, B., Glasnov, T., & Kappe, C. O. (2015). Continuous flow reduction
of artemisinic acid utilizing multi-injection strategies-closing the gap towards
a fully continuous synthesis of antimalarial drugs. Chemistry - A European
Journal. Wiley. https://doi.org/10.1002/chem.201406439
chicago: Pieber, Bartholomäus, Toma Glasnov, and C. Oliver Kappe. “Continuous Flow
Reduction of Artemisinic Acid Utilizing Multi-Injection Strategies-Closing the
Gap towards a Fully Continuous Synthesis of Antimalarial Drugs.” Chemistry
- A European Journal. Wiley, 2015. https://doi.org/10.1002/chem.201406439.
ieee: B. Pieber, T. Glasnov, and C. O. Kappe, “Continuous flow reduction of artemisinic
acid utilizing multi-injection strategies-closing the gap towards a fully continuous
synthesis of antimalarial drugs,” Chemistry - A European Journal, vol.
21, no. 11. Wiley, pp. 4368–4376, 2015.
ista: Pieber B, Glasnov T, Kappe CO. 2015. Continuous flow reduction of artemisinic
acid utilizing multi-injection strategies-closing the gap towards a fully continuous
synthesis of antimalarial drugs. Chemistry - A European Journal. 21(11), 4368–4376.
mla: Pieber, Bartholomäus, et al. “Continuous Flow Reduction of Artemisinic Acid
Utilizing Multi-Injection Strategies-Closing the Gap towards a Fully Continuous
Synthesis of Antimalarial Drugs.” Chemistry - A European Journal, vol.
21, no. 11, Wiley, 2015, pp. 4368–76, doi:10.1002/chem.201406439.
short: B. Pieber, T. Glasnov, C.O. Kappe, Chemistry - A European Journal 21 (2015)
4368–4376.
date_created: 2022-08-24T11:11:10Z
date_published: 2015-03-09T00:00:00Z
date_updated: 2023-02-21T10:09:30Z
day: '09'
doi: 10.1002/chem.201406439
extern: '1'
external_id:
pmid:
- '25655090'
intvolume: ' 21'
issue: '11'
language:
- iso: eng
month: '03'
oa_version: None
page: 4368-4376
pmid: 1
publication: Chemistry - A European Journal
publication_identifier:
eissn:
- 1521-3765
issn:
- 0947-6539
publication_status: published
publisher: Wiley
quality_controlled: '1'
scopus_import: '1'
status: public
title: Continuous flow reduction of artemisinic acid utilizing multi-injection strategies-closing
the gap towards a fully continuous synthesis of antimalarial drugs
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 21
year: '2015'
...
---
_id: '11977'
abstract:
- lang: eng
text: The development of a continuous flow multistep strategy for the synthesis
of linear peptoids and their subsequent macrocyclization via Click chemistry is
described. The central transformation of this process is an Ugi four-component
reaction generating the peptidomimetic core structure. In order to avoid exposure
to the often toxic and malodorous isocyanide building blocks, the continuous approach
was telescoped by the dehydration of the corresponding formamide. In a concurrent
operation, the highly energetic azide moiety required for the subsequent intramolecular
copper-catalyzed azide–alkyne cycloaddition (Click reaction) was installed by
nucleophilic substitution from a bromide precursor. All steps yielding to the
linear core structures can be conveniently coupled without the need for purification
steps resulting in a single process generating the desired peptidomimetics in
good to excellent yields within a 25 min reaction time. The following macrocyclization
was realized in a coil reactor made of copper without any additional additive.
A careful process intensification study demonstrated that this transformation
occurs quantitatively within 25 min at 140 °C. Depending on the resulting ring
strain, either a dimeric or a monomeric form of the cyclic product was obtained.
article_processing_charge: No
article_type: original
author:
- first_name: Carlos Eduardo M.
full_name: Salvador, Carlos Eduardo M.
last_name: Salvador
- first_name: Bartholomäus
full_name: Pieber, Bartholomäus
id: 93e5e5b2-0da6-11ed-8a41-af589a024726
last_name: Pieber
orcid: 0000-0001-8689-388X
- first_name: Philipp M.
full_name: Neu, Philipp M.
last_name: Neu
- first_name: Ana
full_name: Torvisco, Ana
last_name: Torvisco
- first_name: Carlos
full_name: Kleber Z. Andrade, Carlos
last_name: Kleber Z. Andrade
- first_name: C. Oliver
full_name: Kappe, C. Oliver
last_name: Kappe
citation:
ama: Salvador CEM, Pieber B, Neu PM, Torvisco A, Kleber Z. Andrade C, Kappe CO.
A sequential Ugi multicomponent/Cu-catalyzed azide–alkyne cycloaddition approach
for the continuous flow generation of cyclic peptoids. The Journal of Organic
Chemistry. 2015;80(9):4590-4602. doi:10.1021/acs.joc.5b00445
apa: Salvador, C. E. M., Pieber, B., Neu, P. M., Torvisco, A., Kleber Z. Andrade,
C., & Kappe, C. O. (2015). A sequential Ugi multicomponent/Cu-catalyzed azide–alkyne
cycloaddition approach for the continuous flow generation of cyclic peptoids.
The Journal of Organic Chemistry. American Chemical Society. https://doi.org/10.1021/acs.joc.5b00445
chicago: Salvador, Carlos Eduardo M., Bartholomäus Pieber, Philipp M. Neu, Ana Torvisco,
Carlos Kleber Z. Andrade, and C. Oliver Kappe. “A Sequential Ugi Multicomponent/Cu-Catalyzed
Azide–Alkyne Cycloaddition Approach for the Continuous Flow Generation of Cyclic
Peptoids.” The Journal of Organic Chemistry. American Chemical Society,
2015. https://doi.org/10.1021/acs.joc.5b00445.
ieee: C. E. M. Salvador, B. Pieber, P. M. Neu, A. Torvisco, C. Kleber Z. Andrade,
and C. O. Kappe, “A sequential Ugi multicomponent/Cu-catalyzed azide–alkyne cycloaddition
approach for the continuous flow generation of cyclic peptoids,” The Journal
of Organic Chemistry, vol. 80, no. 9. American Chemical Society, pp. 4590–4602,
2015.
ista: Salvador CEM, Pieber B, Neu PM, Torvisco A, Kleber Z. Andrade C, Kappe CO.
2015. A sequential Ugi multicomponent/Cu-catalyzed azide–alkyne cycloaddition
approach for the continuous flow generation of cyclic peptoids. The Journal of
Organic Chemistry. 80(9), 4590–4602.
mla: Salvador, Carlos Eduardo M., et al. “A Sequential Ugi Multicomponent/Cu-Catalyzed
Azide–Alkyne Cycloaddition Approach for the Continuous Flow Generation of Cyclic
Peptoids.” The Journal of Organic Chemistry, vol. 80, no. 9, American Chemical
Society, 2015, pp. 4590–602, doi:10.1021/acs.joc.5b00445.
short: C.E.M. Salvador, B. Pieber, P.M. Neu, A. Torvisco, C. Kleber Z. Andrade,
C.O. Kappe, The Journal of Organic Chemistry 80 (2015) 4590–4602.
date_created: 2022-08-25T10:52:24Z
date_published: 2015-05-01T00:00:00Z
date_updated: 2023-02-21T10:10:04Z
day: '01'
doi: 10.1021/acs.joc.5b00445
extern: '1'
external_id:
pmid:
- '25842982'
intvolume: ' 80'
issue: '9'
language:
- iso: eng
month: '05'
oa_version: None
page: 4590-4602
pmid: 1
publication: The Journal of Organic Chemistry
publication_identifier:
eissn:
- 1520-6904
issn:
- 0022-3263
publication_status: published
publisher: American Chemical Society
quality_controlled: '1'
scopus_import: '1'
status: public
title: A sequential Ugi multicomponent/Cu-catalyzed azide–alkyne cycloaddition approach
for the continuous flow generation of cyclic peptoids
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 80
year: '2015'
...
---
_id: '11989'
abstract:
- lang: eng
text: In recent years, the high demand for sustainable processes resulted in the
development of highly attractive oxidation protocols utilizing molecular oxygen
or even air instead of more uneconomic and often toxic reagents. The application
of these sustainable, gaseous oxidants in conventional batch reactors is often
associated with severe safety risks and process challenges especially on larger
scales. Continuous flow technology offers the possibility to minimize these safety
hazards and concurrently allows working in high-temperature/high-pressure regimes
to access highly efficient oxidation protocols. This review article critically
discusses recent literature examples of flow methodologies for selective aerobic
oxidations of organic compounds. Several technologies and reactor designs for
biphasic gas/liquid as well as supercritical reaction media are presented in detail.
© Springer International Publishing Switzerland 2015.
alternative_title:
- Topics in Organometallic Chemistry
article_processing_charge: No
author:
- first_name: Bartholomäus
full_name: Pieber, Bartholomäus
id: 93e5e5b2-0da6-11ed-8a41-af589a024726
last_name: Pieber
orcid: 0000-0001-8689-388X
- first_name: C. Oliver
full_name: Kappe, C. Oliver
last_name: Kappe
citation:
ama: 'Pieber B, Kappe CO. Aerobic oxidations in continuous flow. In: Noël T, ed.
Organometallic Flow Chemistry. Vol 57. 1st ed. TOPORGAN. Cham: Springer
Nature; 2015:97–136. doi:10.1007/3418_2015_133'
apa: 'Pieber, B., & Kappe, C. O. (2015). Aerobic oxidations in continuous flow.
In T. Noël (Ed.), Organometallic Flow Chemistry (1st ed., Vol. 57, pp.
97–136). Cham: Springer Nature. https://doi.org/10.1007/3418_2015_133'
chicago: 'Pieber, Bartholomäus, and C. Oliver Kappe. “Aerobic Oxidations in Continuous
Flow.” In Organometallic Flow Chemistry, edited by Timothy Noël, 1st ed.,
57:97–136. TOPORGAN. Cham: Springer Nature, 2015. https://doi.org/10.1007/3418_2015_133.'
ieee: 'B. Pieber and C. O. Kappe, “Aerobic oxidations in continuous flow,” in Organometallic
Flow Chemistry, 1st ed., vol. 57, T. Noël, Ed. Cham: Springer Nature, 2015,
pp. 97–136.'
ista: 'Pieber B, Kappe CO. 2015.Aerobic oxidations in continuous flow. In: Organometallic
Flow Chemistry. Topics in Organometallic Chemistry, vol. 57, 97–136.'
mla: Pieber, Bartholomäus, and C. Oliver Kappe. “Aerobic Oxidations in Continuous
Flow.” Organometallic Flow Chemistry, edited by Timothy Noël, 1st ed.,
vol. 57, Springer Nature, 2015, pp. 97–136, doi:10.1007/3418_2015_133.
short: B. Pieber, C.O. Kappe, in:, T. Noël (Ed.), Organometallic Flow Chemistry,
1st ed., Springer Nature, Cham, 2015, pp. 97–136.
date_created: 2022-08-25T11:58:38Z
date_published: 2015-06-10T00:00:00Z
date_updated: 2023-02-21T10:10:35Z
day: '10'
doi: 10.1007/3418_2015_133
edition: '1'
editor:
- first_name: Timothy
full_name: Noël, Timothy
last_name: Noël
extern: '1'
intvolume: ' 57'
language:
- iso: eng
month: '06'
oa_version: None
page: 97–136
place: Cham
publication: Organometallic Flow Chemistry
publication_identifier:
eisbn:
- '9783319332437'
eissn:
- 1616-8534
isbn:
- '9783319332413'
issn:
- 1436-6002
publication_status: published
publisher: Springer Nature
quality_controlled: '1'
scopus_import: '1'
series_title: TOPORGAN
status: public
title: Aerobic oxidations in continuous flow
type: book_chapter
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 57
year: '2015'
...
---
_id: '120'
abstract:
- lang: eng
text: Clustering of fine particles is of crucial importance in settings ranging
from the early stages of planet formation to the coagulation of industrial powders
and airborne pollutants. Models of such clustering typically focus on inelastic
deformation and cohesion. However, even in charge-neutral particle systems comprising
grains of the same dielectric material, tribocharging can generate large amounts
of net positive or negative charge on individual particles, resulting in long-range
electrostatic forces. The effects of such forces on cluster formation are not
well understood and have so far not been studied in situ. Here we report the first
observations of individual collide-and-capture events between charged submillimetre
particles, including Kepler-like orbits. Charged particles can become trapped
in their mutual electrostatic energy well and aggregate via multiple bounces.
This enables the initiation of clustering at relative velocities much larger than
the upper limit for sticking after a head-on collision, a long-standing issue
known from pre-planetary dust aggregation. Moreover, Coulomb interactions together
with dielectric polarization are found to stabilize characteristic molecule-like
configurations, providing new insights for the modelling of clustering dynamics
in a wide range of microscopic dielectric systems, such as charged polarizable
ions, biomolecules and colloids.
acknowledgement: This research was supported by NSF through DMR-1309611. The Chicago
MRSEC, supported by NSF DMR-1420709, is gratefully acknowledged for access to its
shared experimental facilities.
author:
- first_name: Victor
full_name: Lee, Victor
last_name: Lee
- first_name: Scott R
full_name: Waitukaitis, Scott R
id: 3A1FFC16-F248-11E8-B48F-1D18A9856A87
last_name: Waitukaitis
orcid: 0000-0002-2299-3176
- first_name: Marc
full_name: Miskin, Marc
last_name: Miskin
- first_name: Heinrich
full_name: Jaeger, Heinrich
last_name: Jaeger
citation:
ama: Lee V, Waitukaitis SR, Miskin M, Jaeger H. Direct observation of particle interactions
and clustering in charged granular streams. Nature Physics. 2015;11(9):733-737.
doi:10.1038/nphys3396
apa: Lee, V., Waitukaitis, S. R., Miskin, M., & Jaeger, H. (2015). Direct observation
of particle interactions and clustering in charged granular streams. Nature
Physics. Nature Publishing Group. https://doi.org/10.1038/nphys3396
chicago: Lee, Victor, Scott R Waitukaitis, Marc Miskin, and Heinrich Jaeger. “Direct
Observation of Particle Interactions and Clustering in Charged Granular Streams.”
Nature Physics. Nature Publishing Group, 2015. https://doi.org/10.1038/nphys3396.
ieee: V. Lee, S. R. Waitukaitis, M. Miskin, and H. Jaeger, “Direct observation of
particle interactions and clustering in charged granular streams,” Nature Physics,
vol. 11, no. 9. Nature Publishing Group, pp. 733–737, 2015.
ista: Lee V, Waitukaitis SR, Miskin M, Jaeger H. 2015. Direct observation of particle
interactions and clustering in charged granular streams. Nature Physics. 11(9),
733–737.
mla: Lee, Victor, et al. “Direct Observation of Particle Interactions and Clustering
in Charged Granular Streams.” Nature Physics, vol. 11, no. 9, Nature Publishing
Group, 2015, pp. 733–37, doi:10.1038/nphys3396.
short: V. Lee, S.R. Waitukaitis, M. Miskin, H. Jaeger, Nature Physics 11 (2015)
733–737.
date_created: 2018-12-11T11:44:44Z
date_published: 2015-07-13T00:00:00Z
date_updated: 2021-01-12T06:49:02Z
day: '13'
doi: 10.1038/nphys3396
extern: '1'
intvolume: ' 11'
issue: '9'
language:
- iso: eng
month: '07'
oa_version: None
page: 733 - 737
publication: Nature Physics
publication_status: published
publisher: Nature Publishing Group
publist_id: '7934'
quality_controlled: '1'
status: public
title: Direct observation of particle interactions and clustering in charged granular
streams
type: journal_article
user_id: 3E5EF7F0-F248-11E8-B48F-1D18A9856A87
volume: 11
year: '2015'
...
---
_id: '121'
abstract:
- lang: eng
text: We show that the simplest building blocks of origami-based materials - rigid,
degree-four vertices - are generically multistable. The existence of two distinct
branches of folding motion emerging from the flat state suggests at least bistability,
but we show how nonlinearities in the folding motions allow generic vertex geometries
to have as many as five stable states. In special geometries with collinear folds
and symmetry, more branches emerge leading to as many as six stable states. Tuning
the fold energy parameters, we show how monostability is also possible. Finally,
we show how to program the stability features of a single vertex into a periodic
fold tessellation. The resulting metasheets provide a previously unanticipated
functionality - tunable and switchable shape and size via multistability.
acknowledgement: B. G. C. acknowledges support from FOM, and S. W. and M. v. H. acknowledge
support from NWO.
article_number: '055503'
arxiv: 1
author:
- first_name: Scott R
full_name: Waitukaitis, Scott R
id: 3A1FFC16-F248-11E8-B48F-1D18A9856A87
last_name: Waitukaitis
orcid: 0000-0002-2299-3176
- first_name: Rémi
full_name: Menaut, Rémi
last_name: Menaut
- first_name: Bryan
full_name: Chen, Bryan
last_name: Chen
- first_name: Martin
full_name: Van Hecke, Martin
last_name: Van Hecke
citation:
ama: 'Waitukaitis SR, Menaut R, Chen B, Van Hecke M. Origami multistability: From
single vertices to metasheets. APS Physics, Physical Review Letters. 2015;114(5).
doi:10.1103/PhysRevLett.114.055503'
apa: 'Waitukaitis, S. R., Menaut, R., Chen, B., & Van Hecke, M. (2015). Origami
multistability: From single vertices to metasheets. APS Physics, Physical Review
Letters. American Physical Society. https://doi.org/10.1103/PhysRevLett.114.055503'
chicago: 'Waitukaitis, Scott R, Rémi Menaut, Bryan Chen, and Martin Van Hecke. “Origami
Multistability: From Single Vertices to Metasheets.” APS Physics, Physical
Review Letters. American Physical Society, 2015. https://doi.org/10.1103/PhysRevLett.114.055503.'
ieee: 'S. R. Waitukaitis, R. Menaut, B. Chen, and M. Van Hecke, “Origami multistability:
From single vertices to metasheets,” APS Physics, Physical Review Letters,
vol. 114, no. 5. American Physical Society, 2015.'
ista: 'Waitukaitis SR, Menaut R, Chen B, Van Hecke M. 2015. Origami multistability:
From single vertices to metasheets. APS Physics, Physical Review Letters. 114(5),
055503.'
mla: 'Waitukaitis, Scott R., et al. “Origami Multistability: From Single Vertices
to Metasheets.” APS Physics, Physical Review Letters, vol. 114, no. 5,
055503, American Physical Society, 2015, doi:10.1103/PhysRevLett.114.055503.'
short: S.R. Waitukaitis, R. Menaut, B. Chen, M. Van Hecke, APS Physics, Physical
Review Letters 114 (2015).
date_created: 2018-12-11T11:44:44Z
date_published: 2015-02-04T00:00:00Z
date_updated: 2021-01-12T06:49:07Z
day: '04'
doi: 10.1103/PhysRevLett.114.055503
extern: '1'
external_id:
arxiv:
- '1408.1607'
intvolume: ' 114'
issue: '5'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://arxiv.org/abs/1408.1607
month: '02'
oa: 1
oa_version: Preprint
publication: APS Physics, Physical Review Letters
publication_status: published
publisher: American Physical Society
publist_id: '7933'
quality_controlled: '1'
status: public
title: 'Origami multistability: From single vertices to metasheets'
type: journal_article
user_id: 3E5EF7F0-F248-11E8-B48F-1D18A9856A87
volume: 114
year: '2015'
...
---
_id: '12196'
abstract:
- lang: eng
text: SNC1 (SUPPRESSOR OF NPR1, CONSTITUTIVE 1) is one of a suite of intracellular
Arabidopsis NOD-like receptor (NLR) proteins which, upon activation, result in
the induction of defense responses. However, the molecular mechanisms underlying
NLR activation and the subsequent provocation of immune responses are only partially
characterized. To identify negative regulators of NLR-mediated immunity, a forward
genetic screen was undertaken to search for enhancers of the dwarf, autoimmune
gain-of-function snc1 mutant. To avoid lethality resulting from severe dwarfism,
the screen was conducted using mos4 (modifier of snc1, 4) snc1 plants, which display
wild-type-like morphology and resistance. M2 progeny were screened for mutant,
snc1-enhancing (muse) mutants displaying a reversion to snc1-like phenotypes.
The muse9 mos4 snc1 triple mutant was found to exhibit dwarf morphology, elevated
expression of the pPR2-GUS defense marker reporter gene and enhanced resistance
to the oomycete pathogen Hyaloperonospora arabidopsidis Noco2. Via map-based cloning
and Illumina sequencing, it was determined that the muse9 mutation is in the gene
encoding the SWI/SNF chromatin remodeler SYD (SPLAYED), and was thus renamed syd-10.
The syd-10 single mutant has no observable alteration from wild-type-like resistance,
although the syd-4 T-DNA insertion allele displays enhanced resistance to the
bacterial pathogen Pseudomonas syringae pv. maculicola ES4326. Transcription of
SNC1 is increased in both syd-4 and syd-10. These data suggest that SYD plays
a subtle, specific role in the regulation of SNC1 expression and SNC1-mediated
immunity. SYD may work with other proteins at the chromatin level to repress SNC1
transcription; such regulation is important for fine-tuning the expression of
NLR-encoding genes to prevent unpropitious autoimmunity.
acknowledgement: "This work was supported by the National Sciences and Engineering
Research Council of Canada [Canada Graduate\r\nScholarship–Doctoral to K.J.; Discovery
Grant to X.L.]; the department of Botany at the University of f British Columbia\r\n[the
Dewar Cooper Memorial Fund to X.L.].The authors would like to thank Dr. Yuelin Zhang
and Ms. Yan Li for their assistance with next-generation sequencing, and Mr. Charles
Copeland for critical reading of the manuscript."
article_processing_charge: No
article_type: original
author:
- first_name: Kaeli C.M.
full_name: Johnson, Kaeli C.M.
last_name: Johnson
- first_name: Shitou
full_name: Xia, Shitou
last_name: Xia
- first_name: Xiaoqi
full_name: Feng, Xiaoqi
id: e0164712-22ee-11ed-b12a-d80fcdf35958
last_name: Feng
orcid: 0000-0002-4008-1234
- first_name: Xin
full_name: Li, Xin
last_name: Li
citation:
ama: Johnson KCM, Xia S, Feng X, Li X. The chromatin remodeler SPLAYED negatively
regulates SNC1-mediated immunity. Plant and Cell Physiology. 2015;56(8):1616-1623.
doi:10.1093/pcp/pcv087
apa: Johnson, K. C. M., Xia, S., Feng, X., & Li, X. (2015). The chromatin remodeler
SPLAYED negatively regulates SNC1-mediated immunity. Plant and Cell Physiology.
Oxford University Press. https://doi.org/10.1093/pcp/pcv087
chicago: Johnson, Kaeli C.M., Shitou Xia, Xiaoqi Feng, and Xin Li. “The Chromatin
Remodeler SPLAYED Negatively Regulates SNC1-Mediated Immunity.” Plant and Cell
Physiology. Oxford University Press, 2015. https://doi.org/10.1093/pcp/pcv087.
ieee: K. C. M. Johnson, S. Xia, X. Feng, and X. Li, “The chromatin remodeler SPLAYED
negatively regulates SNC1-mediated immunity,” Plant and Cell Physiology,
vol. 56, no. 8. Oxford University Press, pp. 1616–1623, 2015.
ista: Johnson KCM, Xia S, Feng X, Li X. 2015. The chromatin remodeler SPLAYED negatively
regulates SNC1-mediated immunity. Plant and Cell Physiology. 56(8), 1616–1623.
mla: Johnson, Kaeli C. M., et al. “The Chromatin Remodeler SPLAYED Negatively Regulates
SNC1-Mediated Immunity.” Plant and Cell Physiology, vol. 56, no. 8, Oxford
University Press, 2015, pp. 1616–23, doi:10.1093/pcp/pcv087.
short: K.C.M. Johnson, S. Xia, X. Feng, X. Li, Plant and Cell Physiology 56 (2015)
1616–1623.
date_created: 2023-01-16T09:20:22Z
date_published: 2015-08-01T00:00:00Z
date_updated: 2023-05-08T11:03:23Z
department:
- _id: XiFe
doi: 10.1093/pcp/pcv087
extern: '1'
external_id:
pmid:
- '26063389'
intvolume: ' 56'
issue: '8'
keyword:
- Cell Biology
- Plant Science
- Physiology
- General Medicine
language:
- iso: eng
month: '08'
oa_version: None
page: 1616-1623
pmid: 1
publication: Plant and Cell Physiology
publication_identifier:
issn:
- 0032-0781
- 1471-9053
publication_status: published
publisher: Oxford University Press
quality_controlled: '1'
scopus_import: '1'
status: public
title: The chromatin remodeler SPLAYED negatively regulates SNC1-mediated immunity
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 56
year: '2015'
...
---
_id: '12626'
abstract:
- lang: eng
text: Ice cliffs have been identified as a reason for higher ablation rates on debris-covered
glaciers than are implied by the insulation effects of the debris. This study
aims to improve our understanding of cliff backwasting, and the role of radiative
fluxes in particular. An energy-balance model is forced with new data gathered
in May and October 2013 on Lirung Glacier, Nepalese Himalaya. Observations show
substantial variability in melt between cliffs, between locations on any cliff
and between seasons. Using a high-resolution digital elevation model we calculate
longwave fluxes incident to the cliff from surrounding terrain and include the
effect of local shading on shortwave radiation. This is an advance over previous
studies, that made simplified assumptions on cliff geometry and radiative fluxes.
Measured melt rates varied between 3.25 and 8.6 cm d−1 in May and 0.18 and 1.34
cm d−1 in October. Model results reproduce the strong variability in space and
time, suggesting considerable differences in radiative fluxes over one cliff.
In October the model fails to reproduce stake readings, probably due to the lack
of a refreezing component. Disregarding local topography can lead to overestimation
of melt at the point scale by up to ∼9%.
article_processing_charge: No
article_type: original
author:
- first_name: Jakob F.
full_name: Steiner, Jakob F.
last_name: Steiner
- first_name: Francesca
full_name: Pellicciotti, Francesca
id: b28f055a-81ea-11ed-b70c-a9fe7f7b0e70
last_name: Pellicciotti
- first_name: Pascal
full_name: Buri, Pascal
last_name: Buri
- first_name: Evan S.
full_name: Miles, Evan S.
last_name: Miles
- first_name: Walter W.
full_name: Immerzeel, Walter W.
last_name: Immerzeel
- first_name: Tim D.
full_name: Reid, Tim D.
last_name: Reid
citation:
ama: Steiner JF, Pellicciotti F, Buri P, Miles ES, Immerzeel WW, Reid TD. Modelling
ice-cliff backwasting on a debris-covered glacier in the Nepalese Himalaya. Journal
of Glaciology. 2015;61(229):889-907. doi:10.3189/2015jog14j194
apa: Steiner, J. F., Pellicciotti, F., Buri, P., Miles, E. S., Immerzeel, W. W.,
& Reid, T. D. (2015). Modelling ice-cliff backwasting on a debris-covered
glacier in the Nepalese Himalaya. Journal of Glaciology. International
Glaciological Society. https://doi.org/10.3189/2015jog14j194
chicago: Steiner, Jakob F., Francesca Pellicciotti, Pascal Buri, Evan S. Miles,
Walter W. Immerzeel, and Tim D. Reid. “Modelling Ice-Cliff Backwasting on a Debris-Covered
Glacier in the Nepalese Himalaya.” Journal of Glaciology. International
Glaciological Society, 2015. https://doi.org/10.3189/2015jog14j194.
ieee: J. F. Steiner, F. Pellicciotti, P. Buri, E. S. Miles, W. W. Immerzeel, and
T. D. Reid, “Modelling ice-cliff backwasting on a debris-covered glacier in the
Nepalese Himalaya,” Journal of Glaciology, vol. 61, no. 229. International
Glaciological Society, pp. 889–907, 2015.
ista: Steiner JF, Pellicciotti F, Buri P, Miles ES, Immerzeel WW, Reid TD. 2015.
Modelling ice-cliff backwasting on a debris-covered glacier in the Nepalese Himalaya.
Journal of Glaciology. 61(229), 889–907.
mla: Steiner, Jakob F., et al. “Modelling Ice-Cliff Backwasting on a Debris-Covered
Glacier in the Nepalese Himalaya.” Journal of Glaciology, vol. 61, no.
229, International Glaciological Society, 2015, pp. 889–907, doi:10.3189/2015jog14j194.
short: J.F. Steiner, F. Pellicciotti, P. Buri, E.S. Miles, W.W. Immerzeel, T.D.
Reid, Journal of Glaciology 61 (2015) 889–907.
date_created: 2023-02-20T08:16:01Z
date_published: 2015-07-01T00:00:00Z
date_updated: 2023-02-24T09:43:14Z
day: '01'
doi: 10.3189/2015jog14j194
extern: '1'
intvolume: ' 61'
issue: '229'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.3189/2015JoG14J194
month: '07'
oa: 1
oa_version: Published Version
page: 889-907
publication: Journal of Glaciology
publication_identifier:
eissn:
- 1727-5652
issn:
- 0022-1430
publication_status: published
publisher: International Glaciological Society
quality_controlled: '1'
scopus_import: '1'
status: public
title: Modelling ice-cliff backwasting on a debris-covered glacier in the Nepalese
Himalaya
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 61
year: '2015'
...
---
_id: '12627'
abstract:
- lang: eng
text: Spatial evolution of supraglacial debris cover on mountain glaciers is a largely
unmonitored and poorly understood phenomenon that directly affects glacier melt.
Supraglacial debris cover for 93 glaciers in the Karakoram, northern Pakistan,
was mapped from Landsat imagery acquired in 1977, 1998, 2009 and 2014. Surge-type
glaciers occupy 41% of the study area and were considered separately. The time
series of debris-covered surface area change shows a mean value of zero or near-zero
change for both surging and non-surging glaciers. An increase in debris-covered
area is often associated with negative regional mass balances. We extend this
logic to suggest that the stable regional mass balances in the Karakoram explain
the zero or near-zero change in debris-covered area. This coupling of trends combined
with our 37 year time series of data suggests the Karakoram anomaly extends further
back in time than previously known.
article_processing_charge: No
article_type: original
author:
- first_name: Sam
full_name: Herreid, Sam
last_name: Herreid
- first_name: Francesca
full_name: Pellicciotti, Francesca
id: b28f055a-81ea-11ed-b70c-a9fe7f7b0e70
last_name: Pellicciotti
- first_name: Alvaro
full_name: Ayala, Alvaro
last_name: Ayala
- first_name: Anna
full_name: Chesnokova, Anna
last_name: Chesnokova
- first_name: Christian
full_name: Kienholz, Christian
last_name: Kienholz
- first_name: Joseph
full_name: Shea, Joseph
last_name: Shea
- first_name: Arun
full_name: Shrestha, Arun
last_name: Shrestha
citation:
ama: Herreid S, Pellicciotti F, Ayala A, et al. Satellite observations show no net
change in the percentage of supraglacial debris-covered area in northern Pakistan
from 1977 to 2014. Journal of Glaciology. 2015;61(227):524-536. doi:10.3189/2015jog14j227
apa: Herreid, S., Pellicciotti, F., Ayala, A., Chesnokova, A., Kienholz, C., Shea,
J., & Shrestha, A. (2015). Satellite observations show no net change in the
percentage of supraglacial debris-covered area in northern Pakistan from 1977
to 2014. Journal of Glaciology. International Glaciological Society. https://doi.org/10.3189/2015jog14j227
chicago: Herreid, Sam, Francesca Pellicciotti, Alvaro Ayala, Anna Chesnokova, Christian
Kienholz, Joseph Shea, and Arun Shrestha. “Satellite Observations Show No Net
Change in the Percentage of Supraglacial Debris-Covered Area in Northern Pakistan
from 1977 to 2014.” Journal of Glaciology. International Glaciological
Society, 2015. https://doi.org/10.3189/2015jog14j227.
ieee: S. Herreid et al., “Satellite observations show no net change in the
percentage of supraglacial debris-covered area in northern Pakistan from 1977
to 2014,” Journal of Glaciology, vol. 61, no. 227. International Glaciological
Society, pp. 524–536, 2015.
ista: Herreid S, Pellicciotti F, Ayala A, Chesnokova A, Kienholz C, Shea J, Shrestha
A. 2015. Satellite observations show no net change in the percentage of supraglacial
debris-covered area in northern Pakistan from 1977 to 2014. Journal of Glaciology.
61(227), 524–536.
mla: Herreid, Sam, et al. “Satellite Observations Show No Net Change in the Percentage
of Supraglacial Debris-Covered Area in Northern Pakistan from 1977 to 2014.” Journal
of Glaciology, vol. 61, no. 227, International Glaciological Society, 2015,
pp. 524–36, doi:10.3189/2015jog14j227.
short: S. Herreid, F. Pellicciotti, A. Ayala, A. Chesnokova, C. Kienholz, J. Shea,
A. Shrestha, Journal of Glaciology 61 (2015) 524–536.
date_created: 2023-02-20T08:16:06Z
date_published: 2015-05-01T00:00:00Z
date_updated: 2023-02-24T09:40:30Z
day: '01'
doi: 10.3189/2015jog14j227
extern: '1'
intvolume: ' 61'
issue: '227'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.3189/2015JoG14J227
month: '05'
oa: 1
oa_version: Published Version
page: 524-536
publication: Journal of Glaciology
publication_identifier:
eissn:
- 1727-5652
issn:
- 0022-1430
publication_status: published
publisher: International Glaciological Society
quality_controlled: '1'
scopus_import: '1'
status: public
title: Satellite observations show no net change in the percentage of supraglacial
debris-covered area in northern Pakistan from 1977 to 2014
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 61
year: '2015'
...
---
_id: '12628'
abstract:
- lang: eng
text: Thick debris cover on glaciers can significantly reduce ice melt. However,
several studies have suggested that debris-covered glaciers in the Himalaya might
have lost mass at a rate similar to debris-free glaciers. We reconstruct elevation
and mass changes for the debris-covered glaciers of the upper Langtang valley,
Nepalese Himalaya, using a digital elevation model (DEM) from 1974 stereo Hexagon
satellite data and the 2000 SRTM (Shuttle Radar Topography Mission) DEM. Uncertainties
are high in the accumulation areas, due to data gaps in the SRTM and difficulties
with delineation of the glacier borders. Even with these uncertainties, we obtain
thinning rates comparable to those of several other studies in the Himalaya. In
particular, we obtain a total mass balance for the investigated debris-covered
glaciers of the basin of –0.32 ± 0.18 m w.e. a−1. However,
there are major spatial differences both between glaciers and within any single
glacier, exhibiting a very distinct nonlinear mass-balance profile with elevation.
Through analysis of surface velocities derived from Landsat ETM+ imagery, we show
that thinning occurs in areas of low velocity and low slope. These areas are prone
to a general, dynamic decay of surface features and to the development of supraglacial
lakes and ice cliffs, which may be responsible for a considerable increase in
overall glacier ablation.
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: Christa
full_name: Stephan, Christa
last_name: Stephan
- first_name: Evan
full_name: Miles, Evan
last_name: Miles
- first_name: Sam
full_name: Herreid, Sam
last_name: Herreid
- first_name: Walter W.
full_name: Immerzeel, Walter W.
last_name: Immerzeel
- first_name: Tobias
full_name: Bolch, Tobias
last_name: Bolch
citation:
ama: Pellicciotti F, Stephan C, Miles E, Herreid S, Immerzeel WW, Bolch T. Mass-balance
changes of the debris-covered glaciers in the Langtang Himal, Nepal, from 1974
to 1999. Journal of Glaciology. 2015;61(226):373-386. doi:10.3189/2015jog13j237
apa: Pellicciotti, F., Stephan, C., Miles, E., Herreid, S., Immerzeel, W. W., &
Bolch, T. (2015). Mass-balance changes of the debris-covered glaciers in the Langtang
Himal, Nepal, from 1974 to 1999. Journal of Glaciology. International Glaciological
Society. https://doi.org/10.3189/2015jog13j237
chicago: Pellicciotti, Francesca, Christa Stephan, Evan Miles, Sam Herreid, Walter
W. Immerzeel, and Tobias Bolch. “Mass-Balance Changes of the Debris-Covered Glaciers
in the Langtang Himal, Nepal, from 1974 to 1999.” Journal of Glaciology.
International Glaciological Society, 2015. https://doi.org/10.3189/2015jog13j237.
ieee: F. Pellicciotti, C. Stephan, E. Miles, S. Herreid, W. W. Immerzeel, and T.
Bolch, “Mass-balance changes of the debris-covered glaciers in the Langtang Himal,
Nepal, from 1974 to 1999,” Journal of Glaciology, vol. 61, no. 226. International
Glaciological Society, pp. 373–386, 2015.
ista: Pellicciotti F, Stephan C, Miles E, Herreid S, Immerzeel WW, Bolch T. 2015.
Mass-balance changes of the debris-covered glaciers in the Langtang Himal, Nepal,
from 1974 to 1999. Journal of Glaciology. 61(226), 373–386.
mla: Pellicciotti, Francesca, et al. “Mass-Balance Changes of the Debris-Covered
Glaciers in the Langtang Himal, Nepal, from 1974 to 1999.” Journal of Glaciology,
vol. 61, no. 226, International Glaciological Society, 2015, pp. 373–86, doi:10.3189/2015jog13j237.
short: F. Pellicciotti, C. Stephan, E. Miles, S. Herreid, W.W. Immerzeel, T. Bolch,
Journal of Glaciology 61 (2015) 373–386.
date_created: 2023-02-20T08:16:11Z
date_published: 2015-03-01T00:00:00Z
date_updated: 2023-02-24T09:35:21Z
day: '01'
doi: 10.3189/2015jog13j237
extern: '1'
intvolume: ' 61'
issue: '226'
keyword:
- Earth-Surface Processes
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.3189/2015JoG13J237
month: '03'
oa: 1
oa_version: Published Version
page: 373-386
publication: Journal of Glaciology
publication_identifier:
eissn:
- 1727-5652
issn:
- 0022-1430
publication_status: published
publisher: International Glaciological Society
quality_controlled: '1'
scopus_import: '1'
status: public
title: Mass-balance changes of the debris-covered glaciers in the Langtang Himal,
Nepal, from 1974 to 1999
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 61
year: '2015'
...
---
_id: '12629'
abstract:
- lang: eng
text: Meteorological studies in high-mountain environments form the basis of our
understanding of catchment hydrology and glacier accumulation and melt processes,
yet high-altitude (>4000 m above sea level, asl) observatories are rare. This
research presents meteorological data recorded between December 2012 and November
2013 at seven stations in Nepal, ranging in elevation from 3860 to 5360 m asl.
Seasonal and diurnal cycles in air temperature, vapour pressure, incoming short-wave
and long-wave radiation, atmospheric transmissivity, wind speed, and precipitation
are compared between sites. Solar radiation strongly affects diurnal temperature
and vapour pressure cycles, but local topography and valley-scale circulations
alter wind speed and precipitation cycles. The observed diurnal variability in
vertical temperature gradients in all seasons highlights the importance of in
situ measurements for melt modelling. The monsoon signal (progressive onset and
sharp end) is visible in all data-sets, and the passage of the remnants of Typhoon
Phailin in mid-October 2013 provides an interesting case study on the possible
effects of such storms on glaciers in the region.
article_processing_charge: No
article_type: original
author:
- first_name: J.M.
full_name: Shea, J.M.
last_name: Shea
- first_name: P.
full_name: Wagnon, P.
last_name: Wagnon
- first_name: W.W.
full_name: Immerzeel, W.W.
last_name: Immerzeel
- first_name: R.
full_name: Biron, R.
last_name: Biron
- first_name: F.
full_name: Brun, F.
last_name: Brun
- first_name: Francesca
full_name: Pellicciotti, Francesca
id: b28f055a-81ea-11ed-b70c-a9fe7f7b0e70
last_name: Pellicciotti
citation:
ama: Shea JM, Wagnon P, Immerzeel WW, Biron R, Brun F, Pellicciotti F. A comparative
high-altitude meteorological analysis from three catchments in the Nepalese Himalaya.
International Journal of Water Resources Development. 2015;31(2):174-200.
doi:10.1080/07900627.2015.1020417
apa: Shea, J. M., Wagnon, P., Immerzeel, W. W., Biron, R., Brun, F., & Pellicciotti,
F. (2015). A comparative high-altitude meteorological analysis from three catchments
in the Nepalese Himalaya. International Journal of Water Resources Development.
Taylor & Francis. https://doi.org/10.1080/07900627.2015.1020417
chicago: Shea, J.M., P. Wagnon, W.W. Immerzeel, R. Biron, F. Brun, and Francesca
Pellicciotti. “A Comparative High-Altitude Meteorological Analysis from Three
Catchments in the Nepalese Himalaya.” International Journal of Water Resources
Development. Taylor & Francis, 2015. https://doi.org/10.1080/07900627.2015.1020417.
ieee: J. M. Shea, P. Wagnon, W. W. Immerzeel, R. Biron, F. Brun, and F. Pellicciotti,
“A comparative high-altitude meteorological analysis from three catchments in
the Nepalese Himalaya,” International Journal of Water Resources Development,
vol. 31, no. 2. Taylor & Francis, pp. 174–200, 2015.
ista: Shea JM, Wagnon P, Immerzeel WW, Biron R, Brun F, Pellicciotti F. 2015. A
comparative high-altitude meteorological analysis from three catchments in the
Nepalese Himalaya. International Journal of Water Resources Development. 31(2),
174–200.
mla: Shea, J. M., et al. “A Comparative High-Altitude Meteorological Analysis from
Three Catchments in the Nepalese Himalaya.” International Journal of Water
Resources Development, vol. 31, no. 2, Taylor & Francis, 2015, pp. 174–200,
doi:10.1080/07900627.2015.1020417.
short: J.M. Shea, P. Wagnon, W.W. Immerzeel, R. Biron, F. Brun, F. Pellicciotti,
International Journal of Water Resources Development 31 (2015) 174–200.
date_created: 2023-02-20T08:16:17Z
date_published: 2015-04-18T00:00:00Z
date_updated: 2023-02-24T09:30:42Z
day: '18'
doi: 10.1080/07900627.2015.1020417
extern: '1'
intvolume: ' 31'
issue: '2'
keyword:
- Water Science and Technology
- Development
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.1080/07900627.2015.1020417
month: '04'
oa: 1
oa_version: Published Version
page: 174-200
publication: International Journal of Water Resources Development
publication_identifier:
eissn:
- 1360-0648
issn:
- 0790-0627
publication_status: published
publisher: Taylor & Francis
quality_controlled: '1'
scopus_import: '1'
status: public
title: A comparative high-altitude meteorological analysis from three catchments in
the Nepalese Himalaya
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 31
year: '2015'
...
---
_id: '12630'
abstract:
- lang: eng
text: "The hydrology of high-elevation watersheds of the Hindu Kush-Himalaya region
(HKH) is poorly known. The correct representation of internal states and process
dynamics in glacio-hydrological models can often not be verified due to missing
in situ measurements. We use a new set of detailed ground data from the upper
Langtang valley in Nepal to systematically guide a state-of-the art glacio-hydrological
model through a parameter assigning process with the aim to understand the hydrology
of the catchment and contribution of snow and ice processes to runoff. 14 parameters
are directly calculated on the basis of local data, and 13 parameters are calibrated
against 5 different datasets of in situ or remote sensing data. Spatial fields
of debris thickness are reconstructed through a novel approach that employs data
from an Unmanned Aerial Vehicle (UAV), energy balance modeling and statistical
techniques. The model is validated against measured catchment runoff (Nash–Sutcliffe
efficiency 0.87) and modeled snow cover is compared to Landsat snow cover. The
advanced representation of processes allowed assessing the role played by avalanching
for runoff for the first time for a Himalayan catchment (5% of annual water inputs
to the hydrological system are due to snow redistribution) and to quantify the
hydrological significance of sub-debris ice melt (9% of annual water inputs).
Snowmelt is the most important contributor to total runoff during the hydrological
year 2012/2013 (representing 40% of all sources), followed by rainfall (34%) and
ice melt (26%). A sensitivity analysis is used to assess the efficiency of the
monitoring network and identify the timing and location of field measurements
that constrain model uncertainty. The methodology to set up a glacio-hydrological
model in high-elevation regions presented in this study can be regarded as a benchmark
for modelers in the HKH seeking to evaluate their calibration approach, their
experimental setup and thus to reduce the predictive model uncertainty.\r\n\r\n"
article_processing_charge: No
article_type: original
author:
- first_name: S.
full_name: Ragettli, S.
last_name: Ragettli
- first_name: Francesca
full_name: Pellicciotti, Francesca
id: b28f055a-81ea-11ed-b70c-a9fe7f7b0e70
last_name: Pellicciotti
- first_name: W.W.
full_name: Immerzeel, W.W.
last_name: Immerzeel
- first_name: E.S.
full_name: Miles, E.S.
last_name: Miles
- first_name: L.
full_name: Petersen, L.
last_name: Petersen
- first_name: M.
full_name: Heynen, M.
last_name: Heynen
- first_name: J.M.
full_name: Shea, J.M.
last_name: Shea
- first_name: D.
full_name: Stumm, D.
last_name: Stumm
- first_name: S.
full_name: Joshi, S.
last_name: Joshi
- first_name: A.
full_name: Shrestha, A.
last_name: Shrestha
citation:
ama: Ragettli S, Pellicciotti F, Immerzeel WW, et al. Unraveling the hydrology of
a Himalayan catchment through integration of high resolution in situ data and
remote sensing with an advanced simulation model. Advances in Water Resources.
2015;78(4):94-111. doi:10.1016/j.advwatres.2015.01.013
apa: Ragettli, S., Pellicciotti, F., Immerzeel, W. W., Miles, E. S., Petersen, L.,
Heynen, M., … Shrestha, A. (2015). Unraveling the hydrology of a Himalayan catchment
through integration of high resolution in situ data and remote sensing with an
advanced simulation model. Advances in Water Resources. Elsevier. https://doi.org/10.1016/j.advwatres.2015.01.013
chicago: Ragettli, S., Francesca Pellicciotti, W.W. Immerzeel, E.S. Miles, L. Petersen,
M. Heynen, J.M. Shea, D. Stumm, S. Joshi, and A. Shrestha. “Unraveling the Hydrology
of a Himalayan Catchment through Integration of High Resolution in Situ Data and
Remote Sensing with an Advanced Simulation Model.” Advances in Water Resources.
Elsevier, 2015. https://doi.org/10.1016/j.advwatres.2015.01.013.
ieee: S. Ragettli et al., “Unraveling the hydrology of a Himalayan catchment
through integration of high resolution in situ data and remote sensing with an
advanced simulation model,” Advances in Water Resources, vol. 78, no. 4.
Elsevier, pp. 94–111, 2015.
ista: Ragettli S, Pellicciotti F, Immerzeel WW, Miles ES, Petersen L, Heynen M,
Shea JM, Stumm D, Joshi S, Shrestha A. 2015. Unraveling the hydrology of a Himalayan
catchment through integration of high resolution in situ data and remote sensing
with an advanced simulation model. Advances in Water Resources. 78(4), 94–111.
mla: Ragettli, S., et al. “Unraveling the Hydrology of a Himalayan Catchment through
Integration of High Resolution in Situ Data and Remote Sensing with an Advanced
Simulation Model.” Advances in Water Resources, vol. 78, no. 4, Elsevier,
2015, pp. 94–111, doi:10.1016/j.advwatres.2015.01.013.
short: S. Ragettli, F. Pellicciotti, W.W. Immerzeel, E.S. Miles, L. Petersen, M.
Heynen, J.M. Shea, D. Stumm, S. Joshi, A. Shrestha, Advances in Water Resources
78 (2015) 94–111.
date_created: 2023-02-20T08:16:21Z
date_published: 2015-04-01T00:00:00Z
date_updated: 2023-02-24T09:28:04Z
day: '01'
doi: 10.1016/j.advwatres.2015.01.013
extern: '1'
intvolume: ' 78'
issue: '4'
keyword:
- Water Science and Technology
language:
- iso: eng
month: '04'
oa_version: None
page: 94-111
publication: Advances in Water Resources
publication_identifier:
issn:
- 0309-1708
publication_status: published
publisher: Elsevier
quality_controlled: '1'
scopus_import: '1'
status: public
title: Unraveling the hydrology of a Himalayan catchment through integration of high
resolution in situ data and remote sensing with an advanced simulation model
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 78
year: '2015'
...
---
_id: '12631'
abstract:
- lang: eng
text: Air temperature is one of the most relevant input variables for snow and ice
melt calculations. However, local meteorological conditions, complex topography,
and logistical concerns in glacierized regions make the measuring and modeling
of air temperature a difficult task. In this study, we investigate the spatial
distribution of 2 m air temperature over mountain glaciers and propose a modification
to an existing model to improve its representation. Spatially distributed meteorological
data from Haut Glacier d'Arolla (Switzerland), Place (Canada), and Juncal Norte
(Chile) Glaciers are used to examine approximate flow line temperatures during
their respective ablation seasons. During warm conditions (off-glacier temperatures
well above 0°C), observed air temperatures in the upper reaches of Place Glacier
and Haut Glacier d'Arolla decrease down glacier along the approximate flow line.
At Juncal Norte and Haut Glacier d'Arolla, an increase in air temperature is observed
over the glacier tongue. While the temperature behavior over the upper part can
be explained by the cooling effect of the glacier surface, the temperature increase
over the glacier tongue may be caused by several processes induced by the surrounding
warm atmosphere. In order to capture the latter effect, we add an additional term
to the Greuell and Böhm (GB) thermodynamic glacier wind model. For high off-glacier
temperatures, the modified GB model reduces root-mean-square error up to 32% and
provides a new approach for distributing air temperature over mountain glaciers
as a function of off-glacier temperatures and approximate glacier flow lines.
article_processing_charge: No
article_type: original
author:
- first_name: A.
full_name: Ayala, A.
last_name: Ayala
- first_name: Francesca
full_name: Pellicciotti, Francesca
id: b28f055a-81ea-11ed-b70c-a9fe7f7b0e70
last_name: Pellicciotti
- first_name: J. M.
full_name: Shea, J. M.
last_name: Shea
citation:
ama: 'Ayala A, Pellicciotti F, Shea JM. Modeling 2 m air temperatures over mountain
glaciers: Exploring the influence of katabatic cooling and external warming. Journal
of Geophysical Research: Atmospheres. 2015;120(8):3139-3157. doi:10.1002/2015jd023137'
apa: 'Ayala, A., Pellicciotti, F., & Shea, J. M. (2015). Modeling 2 m air temperatures
over mountain glaciers: Exploring the influence of katabatic cooling and external
warming. Journal of Geophysical Research: Atmospheres. American Geophysical
Union. https://doi.org/10.1002/2015jd023137'
chicago: 'Ayala, A., Francesca Pellicciotti, and J. M. Shea. “Modeling 2 m Air Temperatures
over Mountain Glaciers: Exploring the Influence of Katabatic Cooling and External
Warming.” Journal of Geophysical Research: Atmospheres. American Geophysical
Union, 2015. https://doi.org/10.1002/2015jd023137.'
ieee: 'A. Ayala, F. Pellicciotti, and J. M. Shea, “Modeling 2 m air temperatures
over mountain glaciers: Exploring the influence of katabatic cooling and external
warming,” Journal of Geophysical Research: Atmospheres, vol. 120, no. 8.
American Geophysical Union, pp. 3139–3157, 2015.'
ista: 'Ayala A, Pellicciotti F, Shea JM. 2015. Modeling 2 m air temperatures over
mountain glaciers: Exploring the influence of katabatic cooling and external warming.
Journal of Geophysical Research: Atmospheres. 120(8), 3139–3157.'
mla: 'Ayala, A., et al. “Modeling 2 m Air Temperatures over Mountain Glaciers: Exploring
the Influence of Katabatic Cooling and External Warming.” Journal of Geophysical
Research: Atmospheres, vol. 120, no. 8, American Geophysical Union, 2015,
pp. 3139–57, doi:10.1002/2015jd023137.'
short: 'A. Ayala, F. Pellicciotti, J.M. Shea, Journal of Geophysical Research: Atmospheres
120 (2015) 3139–3157.'
date_created: 2023-02-20T08:16:28Z
date_published: 2015-04-18T00:00:00Z
date_updated: 2023-02-24T09:16:26Z
day: '18'
doi: 10.1002/2015jd023137
extern: '1'
intvolume: ' 120'
issue: '8'
keyword:
- Space and Planetary Science
- Earth and Planetary Sciences (miscellaneous)
- Atmospheric Science
- Geophysics
language:
- iso: eng
month: '04'
oa_version: Published Version
page: 3139-3157
publication: 'Journal of Geophysical Research: Atmospheres'
publication_identifier:
eissn:
- 2169-8996
issn:
- 2169-897X
publication_status: published
publisher: American Geophysical Union
quality_controlled: '1'
scopus_import: '1'
status: public
title: 'Modeling 2 m air temperatures over mountain glaciers: Exploring the influence
of katabatic cooling and external warming'
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 120
year: '2015'
...
---
_id: '12881'
acknowledgement: This work was supported by the DFG (SPP 1527) and the EU (FP7, REA
grant no 291734).
article_processing_charge: No
author:
- first_name: Georg S
full_name: Martius, Georg S
id: 3A276B68-F248-11E8-B48F-1D18A9856A87
last_name: Martius
- first_name: Eckehard
full_name: Olbrich, Eckehard
last_name: Olbrich
citation:
ama: 'Martius GS, Olbrich E. Quantifying self-organizing behavior of autonomous
robots. In: Proceedings of the 13th European Conference on Artificial Life.
MIT Press; 2015:78. doi:10.7551/978-0-262-33027-5-ch018'
apa: 'Martius, G. S., & Olbrich, E. (2015). Quantifying self-organizing behavior
of autonomous robots. In Proceedings of the 13th European Conference on Artificial
Life (p. 78). York, United Kingdom: MIT Press. https://doi.org/10.7551/978-0-262-33027-5-ch018'
chicago: Martius, Georg S, and Eckehard Olbrich. “Quantifying Self-Organizing Behavior
of Autonomous Robots.” In Proceedings of the 13th European Conference on Artificial
Life, 78. MIT Press, 2015. https://doi.org/10.7551/978-0-262-33027-5-ch018.
ieee: G. S. Martius and E. Olbrich, “Quantifying self-organizing behavior of autonomous
robots,” in Proceedings of the 13th European Conference on Artificial Life,
York, United Kingdom, 2015, p. 78.
ista: 'Martius GS, Olbrich E. 2015. Quantifying self-organizing behavior of autonomous
robots. Proceedings of the 13th European Conference on Artificial Life. ECAL:
European Conference on Artificial Life, 78.'
mla: Martius, Georg S., and Eckehard Olbrich. “Quantifying Self-Organizing Behavior
of Autonomous Robots.” Proceedings of the 13th European Conference on Artificial
Life, MIT Press, 2015, p. 78, doi:10.7551/978-0-262-33027-5-ch018.
short: G.S. Martius, E. Olbrich, in:, Proceedings of the 13th European Conference
on Artificial Life, MIT Press, 2015, p. 78.
conference:
end_date: 2015-07-24
location: York, United Kingdom
name: 'ECAL: European Conference on Artificial Life'
start_date: 2015-07-20
date_created: 2023-04-30T22:01:07Z
date_published: 2015-07-01T00:00:00Z
date_updated: 2023-05-02T07:06:21Z
day: '01'
ddc:
- '000'
department:
- _id: ChLa
doi: 10.7551/978-0-262-33027-5-ch018
ec_funded: 1
file:
- access_level: open_access
checksum: 880eabe59c9df12f06a882aa1bc4e600
content_type: application/pdf
creator: dernst
date_created: 2023-05-02T07:02:59Z
date_updated: 2023-05-02T07:02:59Z
file_id: '12882'
file_name: 2015_ECAL_Martius.pdf
file_size: 1674241
relation: main_file
success: 1
file_date_updated: 2023-05-02T07:02:59Z
has_accepted_license: '1'
language:
- iso: eng
month: '07'
oa: 1
oa_version: Published Version
page: '78'
project:
- _id: 25681D80-B435-11E9-9278-68D0E5697425
call_identifier: FP7
grant_number: '291734'
name: International IST Postdoc Fellowship Programme
publication: Proceedings of the 13th European Conference on Artificial Life
publication_identifier:
isbn:
- '9780262330275'
publication_status: published
publisher: MIT Press
quality_controlled: '1'
scopus_import: '1'
status: public
title: Quantifying self-organizing behavior of autonomous robots
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: conference
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
year: '2015'
...