--- _id: '11864' abstract: - lang: eng text: Auctions are widely used on the Web. Applications range from internet advertising to platforms such as eBay. In most of these applications the auctions in use are single/multi-item auctions with unit demand. The main drawback of standard mechanisms for this type of auctions, such as VCG and GSP, is the limited expressiveness that they offer to the bidders. The General Auction Mechanism (GAM) of [1] is taking a first step towards addressing the problem of limited expressiveness by computing a bidder optimal, envy free outcome for linear utility functions with identical slopes and a single discontinuity per bidder-item pair. We show that in many practical situations this does not suffice to adequately model the preferences of the bidders, and we overcome this problem by presenting the first mechanism for piece-wise linear utility functions with non-identical slopes and multiple discontinuities. Our mechanism runs in polynomial time. Like GAM it is incentive compatible for inputs that fulfill a certain non-degeneracy requirement, but our requirement is more general than the requirement of GAM. For discontinuous utility functions that are non-degenerate as well as for continuous utility functions the outcome of our mechanism is a competitive equilibrium. We also show how our mechanism can be used to compute approximately bidder optimal, envy free outcomes for a general class of continuous utility functions via piece-wise linear approximation. Finally, we prove hardness results for even more expressive settings. article_processing_charge: No author: - first_name: Paul full_name: Dütting, Paul last_name: Dütting - 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: Ingmar full_name: Weber, Ingmar last_name: Weber citation: ama: 'Dütting P, Henzinger MH, Weber I. An expressive mechanism for auctions on the web. In: Proceedings of the 20th International Conference on World Wide Web. Association for Computing Machinery; 2011:127-136. doi:10.1145/1963405.1963427' apa: 'Dütting, P., Henzinger, M. H., & Weber, I. (2011). An expressive mechanism for auctions on the web. In Proceedings of the 20th international conference on World wide web (pp. 127–136). Hyderabad, India: Association for Computing Machinery. https://doi.org/10.1145/1963405.1963427' chicago: Dütting, Paul, Monika H Henzinger, and Ingmar Weber. “An Expressive Mechanism for Auctions on the Web.” In Proceedings of the 20th International Conference on World Wide Web, 127–36. Association for Computing Machinery, 2011. https://doi.org/10.1145/1963405.1963427. ieee: P. Dütting, M. H. Henzinger, and I. Weber, “An expressive mechanism for auctions on the web,” in Proceedings of the 20th international conference on World wide web, Hyderabad, India, 2011, pp. 127–136. ista: 'Dütting P, Henzinger MH, Weber I. 2011. An expressive mechanism for auctions on the web. Proceedings of the 20th international conference on World wide web. WWW: International Conference on World Wide Web, 127–136.' mla: Dütting, Paul, et al. “An Expressive Mechanism for Auctions on the Web.” Proceedings of the 20th International Conference on World Wide Web, Association for Computing Machinery, 2011, pp. 127–36, doi:10.1145/1963405.1963427. short: P. Dütting, M.H. Henzinger, I. Weber, in:, Proceedings of the 20th International Conference on World Wide Web, Association for Computing Machinery, 2011, pp. 127–136. conference: end_date: 2011-04-01 location: Hyderabad, India name: 'WWW: International Conference on World Wide Web' start_date: 2011-03-28 date_created: 2022-08-16T09:05:34Z date_published: 2011-04-01T00:00:00Z date_updated: 2023-02-17T10:21:18Z day: '01' doi: 10.1145/1963405.1963427 extern: '1' language: - iso: eng month: '04' oa_version: None page: 127 - 136 publication: Proceedings of the 20th international conference on World wide web publication_identifier: isbn: - 978-145030632-4 publication_status: published publisher: Association for Computing Machinery quality_controlled: '1' scopus_import: '1' status: public title: An expressive mechanism for auctions on the web type: conference user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 year: '2011' ... --- _id: '12651' abstract: - lang: eng text: Temperature data from three Automatic Weather Stations and twelve Temperature Loggers are used to investigate the spatiotemporal variability of temperature over a glacier, its main atmospheric controls, the suitability of extrapolation techniques and their effect on melt modeling. We use data collected on Juncal Norte Glacier, central Chile, during one ablation season. We examine temporal and spatial variability in lapse rates (LRs), together with alternative statistical interpolation methods. The main control over the glacier thermal regime is the development of a katabatic boundary layer (KBL). Katabatic wind occurs at night and in the morning and is eroded in the afternoon. LRs reveal strong diurnal variability, with steeper LRs during the day when the katabatic wind weakens and shallower LRs during the night and morning. We suggest that temporally variable LRs should be used to account for the observed change. They tend to be steeper than equivalent constant LRs, and therefore result in a reduction in simulated melt compared to use of constant LRs when extrapolating from lower to higher elevations. In addition to the temporal variability, the temperature-elevation relationship varies also in space. Differences are evident between local LRs and including such variability in melt modeling affects melt simulations. Extrapolation methods based on the spatial variability of the observations after removal of the elevation trend, such as Inverse Distance Weighting or Kriging, do not seem necessary for simulations of gridded temperature data over a glacier. article_number: D23109 article_processing_charge: No article_type: original author: - first_name: L. full_name: Petersen, L. last_name: Petersen - first_name: Francesca full_name: Pellicciotti, Francesca id: b28f055a-81ea-11ed-b70c-a9fe7f7b0e70 last_name: Pellicciotti citation: ama: 'Petersen L, Pellicciotti F. Spatial and temporal variability of air temperature on a melting glacier: Atmospheric controls, extrapolation methods and their effect on melt modeling, Juncal Norte Glacier, Chile. Journal of Geophysical Research: Atmospheres. 2011;116(D23). doi:10.1029/2011jd015842' apa: 'Petersen, L., & Pellicciotti, F. (2011). Spatial and temporal variability of air temperature on a melting glacier: Atmospheric controls, extrapolation methods and their effect on melt modeling, Juncal Norte Glacier, Chile. Journal of Geophysical Research: Atmospheres. American Geophysical Union. https://doi.org/10.1029/2011jd015842' chicago: 'Petersen, L., and Francesca Pellicciotti. “Spatial and Temporal Variability of Air Temperature on a Melting Glacier: Atmospheric Controls, Extrapolation Methods and Their Effect on Melt Modeling, Juncal Norte Glacier, Chile.” Journal of Geophysical Research: Atmospheres. American Geophysical Union, 2011. https://doi.org/10.1029/2011jd015842.' ieee: 'L. Petersen and F. Pellicciotti, “Spatial and temporal variability of air temperature on a melting glacier: Atmospheric controls, extrapolation methods and their effect on melt modeling, Juncal Norte Glacier, Chile,” Journal of Geophysical Research: Atmospheres, vol. 116, no. D23. American Geophysical Union, 2011.' ista: 'Petersen L, Pellicciotti F. 2011. Spatial and temporal variability of air temperature on a melting glacier: Atmospheric controls, extrapolation methods and their effect on melt modeling, Juncal Norte Glacier, Chile. Journal of Geophysical Research: Atmospheres. 116(D23), D23109.' mla: 'Petersen, L., and Francesca Pellicciotti. “Spatial and Temporal Variability of Air Temperature on a Melting Glacier: Atmospheric Controls, Extrapolation Methods and Their Effect on Melt Modeling, Juncal Norte Glacier, Chile.” Journal of Geophysical Research: Atmospheres, vol. 116, no. D23, D23109, American Geophysical Union, 2011, doi:10.1029/2011jd015842.' short: 'L. Petersen, F. Pellicciotti, Journal of Geophysical Research: Atmospheres 116 (2011).' date_created: 2023-02-20T08:18:14Z date_published: 2011-12-16T00:00:00Z date_updated: 2023-02-20T10:29:44Z day: '16' doi: 10.1029/2011jd015842 extern: '1' intvolume: ' 116' issue: D23 keyword: - Paleontology - Space and Planetary Science - Earth and Planetary Sciences (miscellaneous) - Atmospheric Science - Earth-Surface Processes - Geochemistry and Petrology - Soil Science - Water Science and Technology - Ecology - Aquatic Science - Forestry - Oceanography - Geophysics language: - iso: eng main_file_link: - open_access: '1' url: https://doi.org/10.1029/2011JD01584 month: '12' oa: 1 oa_version: Published Version publication: 'Journal of Geophysical Research: Atmospheres' publication_identifier: issn: - 0148-0227 publication_status: published publisher: American Geophysical Union quality_controlled: '1' scopus_import: '1' status: public title: 'Spatial and temporal variability of air temperature on a melting glacier: Atmospheric controls, extrapolation methods and their effect on melt modeling, Juncal Norte Glacier, Chile' type: journal_article user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 volume: 116 year: '2011' ... --- _id: '12649' abstract: - lang: eng text: Physically based hydrological models describe natural processes more accurately than conceptual models but require extensive data sets to produce accurate results. To identify the value of different data sets for improving the performance of the distributed hydrological model TOPKAPI we combine a multivariable validation technique with Monte Carlo simulations. The study is carried out in the snow and ice-dominated Rhonegletscher basin, as these types of mountainous basins are generally the most critical with respect to data availability and sensitivity to climate fluctuations. Each observational data set is used individually and in combination with the other data sets to determine a subset of best parameter combinations out of 10,000 Monte Carlos runs performed with randomly generated parameter sets. We validate model results against discharge, glacier mass balance, and satellite snow cover images for a 14 year time period (1994–2007). While the use of all data sets combined provides the best overall model performance (defined by the concurrent best agreement of simulated discharge, snow cover and mass balance with their respective measurements), the use of one or two variables for constraining the model results in poorer performance. Using only one data set for constraining the model glacier mass balance proved to be the most efficient observation leading to the best overall model performance. Our main result is that a combination of discharge and satellite snow cover images is best for improving model performance, since the volumetric information of discharge data and the spatial information of snow cover images are complementary. article_number: W07519 article_processing_charge: No article_type: original author: - first_name: David full_name: Finger, David last_name: Finger - first_name: Francesca full_name: Pellicciotti, Francesca id: b28f055a-81ea-11ed-b70c-a9fe7f7b0e70 last_name: Pellicciotti - first_name: Markus full_name: Konz, Markus last_name: Konz - first_name: Stefan full_name: Rimkus, Stefan last_name: Rimkus - first_name: Paolo full_name: Burlando, Paolo last_name: Burlando citation: ama: Finger D, Pellicciotti F, Konz M, Rimkus S, Burlando P. The value of glacier mass balance, satellite snow cover images, and hourly discharge for improving the performance of a physically based distributed hydrological model. Water Resources Research. 2011;47(7). doi:10.1029/2010wr009824 apa: Finger, D., Pellicciotti, F., Konz, M., Rimkus, S., & Burlando, P. (2011). The value of glacier mass balance, satellite snow cover images, and hourly discharge for improving the performance of a physically based distributed hydrological model. Water Resources Research. American Geophysical Union. https://doi.org/10.1029/2010wr009824 chicago: Finger, David, Francesca Pellicciotti, Markus Konz, Stefan Rimkus, and Paolo Burlando. “The Value of Glacier Mass Balance, Satellite Snow Cover Images, and Hourly Discharge for Improving the Performance of a Physically Based Distributed Hydrological Model.” Water Resources Research. American Geophysical Union, 2011. https://doi.org/10.1029/2010wr009824. ieee: D. Finger, F. Pellicciotti, M. Konz, S. Rimkus, and P. Burlando, “The value of glacier mass balance, satellite snow cover images, and hourly discharge for improving the performance of a physically based distributed hydrological model,” Water Resources Research, vol. 47, no. 7. American Geophysical Union, 2011. ista: Finger D, Pellicciotti F, Konz M, Rimkus S, Burlando P. 2011. The value of glacier mass balance, satellite snow cover images, and hourly discharge for improving the performance of a physically based distributed hydrological model. Water Resources Research. 47(7), W07519. mla: Finger, David, et al. “The Value of Glacier Mass Balance, Satellite Snow Cover Images, and Hourly Discharge for Improving the Performance of a Physically Based Distributed Hydrological Model.” Water Resources Research, vol. 47, no. 7, W07519, American Geophysical Union, 2011, doi:10.1029/2010wr009824. short: D. Finger, F. Pellicciotti, M. Konz, S. Rimkus, P. Burlando, Water Resources Research 47 (2011). date_created: 2023-02-20T08:18:03Z date_published: 2011-07-01T00:00:00Z date_updated: 2023-02-20T10:39:57Z day: '01' doi: 10.1029/2010wr009824 extern: '1' intvolume: ' 47' issue: '7' language: - iso: eng main_file_link: - open_access: '1' url: https://doi.org/10.1029/2010WR009824 month: '07' oa: 1 oa_version: Published Version publication: Water Resources Research publication_identifier: issn: - 0043-1397 publication_status: published publisher: American Geophysical Union quality_controlled: '1' scopus_import: '1' status: public title: The value of glacier mass balance, satellite snow cover images, and hourly discharge for improving the performance of a physically based distributed hydrological model type: journal_article user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 volume: 47 year: '2011' ... --- _id: '12652' abstract: - lang: eng text: We explore the robustness and transferability of parameterizations of cloud radiative forcing used in glacier melt models at two sites in the Swiss Alps. We also look at the rationale behind some of the most commonly used approaches, and explore the relationship between cloud transmittance and several standard meteorological variables. The 2 m air-temperature diurnal range is the best predictor of variations in cloud transmittance. However, linear and exponential parameterizations can only explain 30–50% of the observed variance in computed cloud transmittance factors. We examine the impact of modelled cloud transmittance factors on both solar radiation and ablation rates computed with an enhanced temperature-index model. The melt model performance decreases when modelled radiation is used, the reduction being due to an underestimation of incoming solar radiation on clear-sky days. The model works well under overcast conditions. We also seek alternatives to the use of in situ ground data. However, outputs from an atmospheric model (2.2 km horizontal resolution) do not seem to provide an alternative to the parameterizations of cloud radiative forcing based on observations of air temperature at glacier automatic weather stations. Conversely, the correct definition of overcast conditions is important. 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: Thomas full_name: Raschle, Thomas last_name: Raschle - first_name: Thomas full_name: Huerlimann, Thomas last_name: Huerlimann - first_name: Marco full_name: Carenzo, Marco last_name: Carenzo - first_name: Paolo full_name: Burlando, Paolo last_name: Burlando citation: ama: 'Pellicciotti F, Raschle T, Huerlimann T, Carenzo M, Burlando P. Transmission of solar radiation through clouds on melting glaciers: A comparison of parameterizations and their impact on melt modelling. Journal of Glaciology. 2011;57(202):367-381. doi:10.3189/002214311796406013' apa: 'Pellicciotti, F., Raschle, T., Huerlimann, T., Carenzo, M., & Burlando, P. (2011). Transmission of solar radiation through clouds on melting glaciers: A comparison of parameterizations and their impact on melt modelling. Journal of Glaciology. Cambridge University Press. https://doi.org/10.3189/002214311796406013' chicago: 'Pellicciotti, Francesca, Thomas Raschle, Thomas Huerlimann, Marco Carenzo, and Paolo Burlando. “Transmission of Solar Radiation through Clouds on Melting Glaciers: A Comparison of Parameterizations and Their Impact on Melt Modelling.” Journal of Glaciology. Cambridge University Press, 2011. https://doi.org/10.3189/002214311796406013.' ieee: 'F. Pellicciotti, T. Raschle, T. Huerlimann, M. Carenzo, and P. Burlando, “Transmission of solar radiation through clouds on melting glaciers: A comparison of parameterizations and their impact on melt modelling,” Journal of Glaciology, vol. 57, no. 202. Cambridge University Press, pp. 367–381, 2011.' ista: 'Pellicciotti F, Raschle T, Huerlimann T, Carenzo M, Burlando P. 2011. Transmission of solar radiation through clouds on melting glaciers: A comparison of parameterizations and their impact on melt modelling. Journal of Glaciology. 57(202), 367–381.' mla: 'Pellicciotti, Francesca, et al. “Transmission of Solar Radiation through Clouds on Melting Glaciers: A Comparison of Parameterizations and Their Impact on Melt Modelling.” Journal of Glaciology, vol. 57, no. 202, Cambridge University Press, 2011, pp. 367–81, doi:10.3189/002214311796406013.' short: F. Pellicciotti, T. Raschle, T. Huerlimann, M. Carenzo, P. Burlando, Journal of Glaciology 57 (2011) 367–381. date_created: 2023-02-20T08:18:21Z date_published: 2011-03-01T00:00:00Z date_updated: 2023-02-20T09:47:00Z day: '01' doi: 10.3189/002214311796406013 extern: '1' intvolume: ' 57' issue: '202' language: - iso: eng main_file_link: - open_access: '1' url: https://doi.org/10.3189/002214311796406013 month: '03' oa: 1 oa_version: Published Version page: 367-381 publication: Journal of Glaciology publication_identifier: eissn: - 1727-5652 issn: - 0022-1430 publication_status: published publisher: Cambridge University Press quality_controlled: '1' scopus_import: '1' status: public title: 'Transmission of solar radiation through clouds on melting glaciers: A comparison of parameterizations and their impact on melt modelling' type: journal_article user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 volume: 57 year: '2011' ... --- _id: '12650' abstract: - lang: eng text: Streamflow is a hydrological variable measured at a defined river cross-section; it spatially integrates the runoff generating processes in the contributing watershed, including precipitation and air temperature. Trends in streamflow are progressive changes in the time series of streamflow that can be detected with statistical methods and their statistical significance can be assessed. Mountainous regions are particularly vulnerable to streamflow change because of their high specific runoff and the sensitivity to the distribution of precipitation and air temperature, and the processes of snow accumulation and melt. alternative_title: - Encyclopedia of Earth Sciences Series article_processing_charge: No author: - first_name: Peter full_name: Molnar, Peter last_name: Molnar - first_name: Paolo full_name: Burlando, Paolo last_name: Burlando - first_name: Francesca full_name: Pellicciotti, Francesca id: b28f055a-81ea-11ed-b70c-a9fe7f7b0e70 last_name: Pellicciotti citation: ama: 'Molnar P, Burlando P, Pellicciotti F. Streamflow Trends in Mountainous Regions. In: Singh V, Singh P, Haritashya U, eds. Encyclopedia of Snow, Ice and Glaciers. 1st ed. Dordrecht: Springer Nature; 2011:1084-1089. doi:10.1007/978-90-481-2642-2_543' apa: 'Molnar, P., Burlando, P., & Pellicciotti, F. (2011). Streamflow Trends in Mountainous Regions. In V. Singh, P. Singh, & U. Haritashya (Eds.), Encyclopedia of Snow, Ice and Glaciers (1st ed., pp. 1084–1089). Dordrecht: Springer Nature. https://doi.org/10.1007/978-90-481-2642-2_543' chicago: 'Molnar, Peter, Paolo Burlando, and Francesca Pellicciotti. “Streamflow Trends in Mountainous Regions.” In Encyclopedia of Snow, Ice and Glaciers, edited by Vijay Singh, Pratap Singh, and Umesh Haritashya, 1st ed., 1084–89. Dordrecht: Springer Nature, 2011. https://doi.org/10.1007/978-90-481-2642-2_543.' ieee: 'P. Molnar, P. Burlando, and F. Pellicciotti, “Streamflow Trends in Mountainous Regions,” in Encyclopedia of Snow, Ice and Glaciers, 1st ed., V. Singh, P. Singh, and U. Haritashya, Eds. Dordrecht: Springer Nature, 2011, pp. 1084–1089.' ista: 'Molnar P, Burlando P, Pellicciotti F. 2011.Streamflow Trends in Mountainous Regions. In: Encyclopedia of Snow, Ice and Glaciers. Encyclopedia of Earth Sciences Series, , 1084–1089.' mla: Molnar, Peter, et al. “Streamflow Trends in Mountainous Regions.” Encyclopedia of Snow, Ice and Glaciers, edited by Vijay Singh et al., 1st ed., Springer Nature, 2011, pp. 1084–89, doi:10.1007/978-90-481-2642-2_543. short: P. Molnar, P. Burlando, F. Pellicciotti, in:, V. Singh, P. Singh, U. Haritashya (Eds.), Encyclopedia of Snow, Ice and Glaciers, 1st ed., Springer Nature, Dordrecht, 2011, pp. 1084–1089. date_created: 2023-02-20T08:18:07Z date_published: 2011-07-01T00:00:00Z date_updated: 2023-02-20T10:35:28Z day: '01' doi: 10.1007/978-90-481-2642-2_543 edition: '1' editor: - first_name: Vijay full_name: Singh, Vijay last_name: Singh - first_name: Pratap full_name: Singh, Pratap last_name: Singh - first_name: Umesh full_name: Haritashya, Umesh last_name: Haritashya extern: '1' language: - iso: eng month: '07' oa_version: None page: 1084-1089 place: Dordrecht publication: Encyclopedia of Snow, Ice and Glaciers publication_identifier: eisbn: - 978-90-481-2642-2 eissn: - 1871-756X isbn: - 978-90-481-2641-5 issn: - 1388-4360 publication_status: published publisher: Springer Nature quality_controlled: '1' scopus_import: '1' status: public title: Streamflow Trends in Mountainous Regions type: book_chapter user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 year: '2011' ... --- _id: '1299' abstract: - lang: eng text: Recent experiments have shown that motion detection in Drosophila starts with splitting the visual input into two parallel channels encoding brightness increments (ON) or decrements (OFF). This suggests the existence of either two (ON-ON, OFF-OFF) or four (for all pairwise interactions) separate motion detectors. To decide between these possibilities, we stimulated flies using sequences of ON and OFF brightness pulses while recording from motion-sensitive tangential cells. We found direction-selective responses to sequences of same sign (ON-ON, OFF-OFF), but not of opposite sign (ON-OFF, OFF-ON), refuting the existence of four separate detectors. Based on further measurements, we propose a model that reproduces a variety of additional experimental data sets, including ones that were previously interpreted as support for four separate detectors. Our experiments and the derived model mark an important step in guiding further dissection of the fly motion detection circuit. author: - first_name: Hubert full_name: Eichner, Hubert last_name: Eichner - first_name: Maximilian A full_name: Maximilian Jösch id: 2BD278E6-F248-11E8-B48F-1D18A9856A87 last_name: Jösch orcid: 0000-0002-3937-1330 - first_name: Bettina full_name: Schnell, Bettina last_name: Schnell - first_name: Dierk full_name: Reiff, Dierk F last_name: Reiff - first_name: Alexander full_name: Borst, Alexander last_name: Borst citation: ama: Eichner H, Jösch MA, Schnell B, Reiff D, Borst A. Internal structure of the fly elementary motion detector. Neuron. 2011;70(6):1155-1164. doi:10.1016/j.neuron.2011.03.028 apa: Eichner, H., Jösch, M. A., Schnell, B., Reiff, D., & Borst, A. (2011). Internal structure of the fly elementary motion detector. Neuron. Elsevier. https://doi.org/10.1016/j.neuron.2011.03.028 chicago: Eichner, Hubert, Maximilian A Jösch, Bettina Schnell, Dierk Reiff, and Alexander Borst. “Internal Structure of the Fly Elementary Motion Detector.” Neuron. Elsevier, 2011. https://doi.org/10.1016/j.neuron.2011.03.028. ieee: H. Eichner, M. A. Jösch, B. Schnell, D. Reiff, and A. Borst, “Internal structure of the fly elementary motion detector,” Neuron, vol. 70, no. 6. Elsevier, pp. 1155–1164, 2011. ista: Eichner H, Jösch MA, Schnell B, Reiff D, Borst A. 2011. Internal structure of the fly elementary motion detector. Neuron. 70(6), 1155–1164. mla: Eichner, Hubert, et al. “Internal Structure of the Fly Elementary Motion Detector.” Neuron, vol. 70, no. 6, Elsevier, 2011, pp. 1155–64, doi:10.1016/j.neuron.2011.03.028. short: H. Eichner, M.A. Jösch, B. Schnell, D. Reiff, A. Borst, Neuron 70 (2011) 1155–1164. date_created: 2018-12-11T11:51:14Z date_published: 2011-06-23T00:00:00Z date_updated: 2021-01-12T06:49:43Z day: '23' doi: 10.1016/j.neuron.2011.03.028 extern: 1 intvolume: ' 70' issue: '6' month: '06' page: 1155 - 1164 publication: Neuron publication_status: published publisher: Elsevier publist_id: '5969' quality_controlled: 0 status: public title: Internal structure of the fly elementary motion detector type: journal_article volume: 70 year: '2011' ... --- _id: '1467' abstract: - lang: eng text: We propose a general conjecture for the mixed Hodge polynomial of the generic character varieties of representations of the fundamental group of a Riemann surface of genus g to GLn(C) with fixed generic semisimple conjugacy classes at k punctures. This conjecture generalizes the Cauchy identity for Macdonald polynomials and is a common generalization of two formulas that we prove in this paper. The first is a formula for the E-polynomial of these character varieties which we obtain using the character table of GLn(Fq). We use this formula to compute the Euler characteristic of character varieties. The second formula gives the Poincaré polynomial of certain associated quiver varieties which we obtain using the character table of gln(Fq). In the last main result we prove that the Poincaré polynomials of the quiver varieties equal certain multiplicities in the tensor product of irreducible characters of GLn(Fq). As a consequence we find a curious connection between Kac-Moody algebras associated with comet-shaped, and typically wild, quivers and the representation theory of GLn(Fq). acknowledgement: |- Hausel’s work was supported by National Science Foundation grants DMS-0305505 and DMS-0604775, by an Alfred Sloan Fellowship, and by a Royal Society University Research Fellowship. Letellier’s work supported by Agence Nationale de la Recherche grant ANR-09-JCJC-0102-01. Rodriguez-Villegas’s work supported by National Science Foundation grant DMS-0200605, by an FRA from the University of Texas at Austin, by EPSRC grant EP/G027110/1, by visiting fellowships at All Souls and Wadham Colleges in Oxford, and by a Research Scholarship from the Clay Mathematical Institute. author: - first_name: Tamas full_name: Tamas Hausel id: 4A0666D8-F248-11E8-B48F-1D18A9856A87 last_name: Hausel - first_name: Emmanuel full_name: Letellier, Emmanuel last_name: Letellier - first_name: Fernando full_name: Rodríguez Villegas, Fernando last_name: Rodríguez Villegas citation: ama: Hausel T, Letellier E, Rodríguez Villegas F. Arithmetic harmonic analysis on character and quiver varieties. Duke Mathematical Journal. 2011;160(2):323-400. doi:10.1215/00127094-1444258 apa: Hausel, T., Letellier, E., & Rodríguez Villegas, F. (2011). Arithmetic harmonic analysis on character and quiver varieties. Duke Mathematical Journal. Duke University Press. https://doi.org/10.1215/00127094-1444258 chicago: Hausel, Tamás, Emmanuel Letellier, and Fernando Rodríguez Villegas. “Arithmetic Harmonic Analysis on Character and Quiver Varieties.” Duke Mathematical Journal. Duke University Press, 2011. https://doi.org/10.1215/00127094-1444258. ieee: T. Hausel, E. Letellier, and F. Rodríguez Villegas, “Arithmetic harmonic analysis on character and quiver varieties,” Duke Mathematical Journal, vol. 160, no. 2. Duke University Press, pp. 323–400, 2011. ista: Hausel T, Letellier E, Rodríguez Villegas F. 2011. Arithmetic harmonic analysis on character and quiver varieties. Duke Mathematical Journal. 160(2), 323–400. mla: Hausel, Tamás, et al. “Arithmetic Harmonic Analysis on Character and Quiver Varieties.” Duke Mathematical Journal, vol. 160, no. 2, Duke University Press, 2011, pp. 323–400, doi:10.1215/00127094-1444258. short: T. Hausel, E. Letellier, F. Rodríguez Villegas, Duke Mathematical Journal 160 (2011) 323–400. date_created: 2018-12-11T11:52:11Z date_published: 2011-01-01T00:00:00Z date_updated: 2021-01-12T06:50:56Z day: '01' doi: 10.1215/00127094-1444258 extern: 1 intvolume: ' 160' issue: '2' main_file_link: - open_access: '1' url: http://arxiv.org/abs/0810.2076 month: '01' oa: 1 page: 323 - 400 publication: Duke Mathematical Journal publication_status: published publisher: Duke University Press publist_id: '5728' quality_controlled: 0 status: public title: Arithmetic harmonic analysis on character and quiver varieties type: journal_article volume: 160 year: '2011' ... --- _id: '1723' abstract: - lang: eng text: The emergence of differences in the arrangement of cells is the first step towards the establishment of many organs. Understanding this process is limited by the lack of systematic characterization of epithelial organisation. Here we apply network theory at the scale of individual cells to uncover patterns in cell-to-cell contacts that govern epithelial organisation. We provide an objective characterisation of epithelia using network representation, where cells are nodes and cell contacts are links. The features of individual cells, together with attributes of the cellular network, produce a defining signature that distinguishes epithelia from different organs, species, developmental stages and genetic conditions. The approach permits characterization, quantification and classification of normal and perturbed epithelia, and establishes a framework for understanding molecular mechanisms that underpin the architecture of complex tissues. acknowledgement: We acknowledge the MRC for funding, M.M.B. acknowledges Darwin College, EMBO YIP and Schlumberger Ltd for support. L.M.E. is funded by the Marie Curie and the EMBO fellowships. L.d.F.C. is grateful to FAPESP (05/00587-5) and CNPq (301303/06-1) for financial support. Part of this work was performed during a Visiting Scholarship to L.d.F.C. from St Catharine's College, University of Cambridge. J.B. is supported by the MRC (UK) and A.K. by a FEBS fellowship author: - first_name: Luis full_name: Escudero, Luis M last_name: Escudero - first_name: Luciano full_name: Costa, Luciano last_name: Costa - first_name: Anna full_name: Anna Kicheva id: 3959A2A0-F248-11E8-B48F-1D18A9856A87 last_name: Kicheva orcid: 0000-0003-4509-4998 - first_name: James full_name: Briscoe, James last_name: Briscoe - first_name: Matthew full_name: Freeman, Matthew last_name: Freeman - first_name: Madan full_name: Babu, Madan M last_name: Babu citation: ama: Escudero L, Costa L, Kicheva A, Briscoe J, Freeman M, Babu M. Epithelial organisation revealed by a network of cellular contacts. Nature Communications. 2011;2(1). doi:10.1038/ncomms1536 apa: Escudero, L., Costa, L., Kicheva, A., Briscoe, J., Freeman, M., & Babu, M. (2011). Epithelial organisation revealed by a network of cellular contacts. Nature Communications. Nature Publishing Group. https://doi.org/10.1038/ncomms1536 chicago: Escudero, Luis, Luciano Costa, Anna Kicheva, James Briscoe, Matthew Freeman, and Madan Babu. “Epithelial Organisation Revealed by a Network of Cellular Contacts.” Nature Communications. Nature Publishing Group, 2011. https://doi.org/10.1038/ncomms1536. ieee: L. Escudero, L. Costa, A. Kicheva, J. Briscoe, M. Freeman, and M. Babu, “Epithelial organisation revealed by a network of cellular contacts,” Nature Communications, vol. 2, no. 1. Nature Publishing Group, 2011. ista: Escudero L, Costa L, Kicheva A, Briscoe J, Freeman M, Babu M. 2011. Epithelial organisation revealed by a network of cellular contacts. Nature Communications. 2(1). mla: Escudero, Luis, et al. “Epithelial Organisation Revealed by a Network of Cellular Contacts.” Nature Communications, vol. 2, no. 1, Nature Publishing Group, 2011, doi:10.1038/ncomms1536. short: L. Escudero, L. Costa, A. Kicheva, J. Briscoe, M. Freeman, M. Babu, Nature Communications 2 (2011). date_created: 2018-12-11T11:53:40Z date_published: 2011-01-01T00:00:00Z date_updated: 2021-01-12T06:52:46Z day: '01' doi: 10.1038/ncomms1536 extern: 1 intvolume: ' 2' issue: '1' month: '01' publication: Nature Communications publication_status: published publisher: Nature Publishing Group publist_id: '5405' quality_controlled: 0 status: public title: Epithelial organisation revealed by a network of cellular contacts type: journal_article volume: 2 year: '2011' ... --- _id: '1724' abstract: - lang: eng text: Morphogens, such as Decapentaplegic (Dpp) in the fly imaginal discs, form graded concentration profiles that control patterning and growth of developing organs. In the imaginal discs, proliferative growth is homogeneous in space, posing the conundrum of how morphogen concentration gradients could control position-independent growth. To understand the mechanism of proliferation control by the Dpp gradient, we quantified Dpp concentration and signaling levels during wing disc growth. Both Dpp concentration and signaling gradients scale with tissue size during development. On average, cells divide when Dpp signaling levels have increased by 50%. Our observations are consistent with a growth control mechanism based on temporal changes of cellular morphogen signaling levels. For a scaling gradient, this mechanism generates position-independent growth rates. acknowledgement: P.M., T.B., and F.J. were supported by the Max-Planck-Gesellschaft. O.W., A.K., C.S., and M.G.-G. were supported by Geneva University and by European Research Council advanced investigator grant (SARA), SystemsX (LipidX), Swiss National Science Foundation (SNF), National Centre of Competence in Research (NCCR) chemical biology and Frontiers in Genetics and R'equip grants author: - first_name: Ortrud full_name: Wartlick, Ortrud last_name: Wartlick - first_name: Peer full_name: Mumcu, Peer last_name: Mumcu - first_name: Anna full_name: Anna Kicheva id: 3959A2A0-F248-11E8-B48F-1D18A9856A87 last_name: Kicheva orcid: 0000-0003-4509-4998 - first_name: Thomas full_name: Bittig, Thomas last_name: Bittig - first_name: Carole full_name: Seum, Carole last_name: Seum - first_name: Frank full_name: Jülicher, Frank last_name: Jülicher - first_name: Marcos full_name: González-Gaitán, Marcos A last_name: González Gaitán citation: ama: Wartlick O, Mumcu P, Kicheva A, et al. Dynamics of Dpp signaling and proliferation control. Science. 2011;331(6021):1154-1159. doi:10.1126/science.1200037 apa: Wartlick, O., Mumcu, P., Kicheva, A., Bittig, T., Seum, C., Jülicher, F., & González Gaitán, M. (2011). Dynamics of Dpp signaling and proliferation control. Science. American Association for the Advancement of Science. https://doi.org/10.1126/science.1200037 chicago: Wartlick, Ortrud, Peer Mumcu, Anna Kicheva, Thomas Bittig, Carole Seum, Frank Jülicher, and Marcos González Gaitán. “Dynamics of Dpp Signaling and Proliferation Control.” Science. American Association for the Advancement of Science, 2011. https://doi.org/10.1126/science.1200037. ieee: O. Wartlick et al., “Dynamics of Dpp signaling and proliferation control,” Science, vol. 331, no. 6021. American Association for the Advancement of Science, pp. 1154–1159, 2011. ista: Wartlick O, Mumcu P, Kicheva A, Bittig T, Seum C, Jülicher F, González Gaitán M. 2011. Dynamics of Dpp signaling and proliferation control. Science. 331(6021), 1154–1159. mla: Wartlick, Ortrud, et al. “Dynamics of Dpp Signaling and Proliferation Control.” Science, vol. 331, no. 6021, American Association for the Advancement of Science, 2011, pp. 1154–59, doi:10.1126/science.1200037. short: O. Wartlick, P. Mumcu, A. Kicheva, T. Bittig, C. Seum, F. Jülicher, M. González Gaitán, Science 331 (2011) 1154–1159. date_created: 2018-12-11T11:53:40Z date_published: 2011-03-04T00:00:00Z date_updated: 2021-01-12T06:52:46Z day: '04' doi: 10.1126/science.1200037 extern: 1 intvolume: ' 331' issue: '6021' month: '03' page: 1154 - 1159 publication: Science publication_status: published publisher: American Association for the Advancement of Science publist_id: '5406' quality_controlled: 0 status: public title: Dynamics of Dpp signaling and proliferation control type: journal_article volume: 331 year: '2011' ... --- _id: '1754' abstract: - lang: eng text: 'We report on a technique enabling electrical control of the contact silicidation process in silicon nanowire devices. Undoped silicon nanowires were contacted by pairs of nickel electrodes and each contact was selectively silicided by means of the Joule effect. By a realtime monitoring of the nanowire electrical resistance during the contact silicidation process we were able to fabricate nickel-silicide/silicon/nickel- silicide devices with controlled silicon channel length down to 8 nm. ' acknowledgement: This work was supported by the Agence Nationale de la Recherche (ANR) through the ACCESS and COHESION projects and by the European Commission through the Chemtronics program MEST-CT-2005-020513 author: - first_name: Massimo full_name: Mongillo, Massimo last_name: Mongillo - first_name: Panayotis full_name: Spathis, Panayotis last_name: Spathis - first_name: Georgios full_name: Katsaros, Georgios id: 38DB5788-F248-11E8-B48F-1D18A9856A87 last_name: Katsaros - first_name: Pascal full_name: Gentile, Pascal last_name: Gentile - first_name: Marc full_name: Sanquer, Marc last_name: Sanquer - first_name: Silvano full_name: De Franceschi, Silvano last_name: De Franceschi citation: ama: Mongillo M, Spathis P, Katsaros G, Gentile P, Sanquer M, De Franceschi S. Joule-assisted silicidation for short-channel silicon nanowire devices. ACS Nano. 2011;5(9):7117-7123. doi:10.1021/nn202524j apa: Mongillo, M., Spathis, P., Katsaros, G., Gentile, P., Sanquer, M., & De Franceschi, S. (2011). Joule-assisted silicidation for short-channel silicon nanowire devices. ACS Nano. American Chemical Society. https://doi.org/10.1021/nn202524j chicago: Mongillo, Massimo, Panayotis Spathis, Georgios Katsaros, Pascal Gentile, Marc Sanquer, and Silvano De Franceschi. “Joule-Assisted Silicidation for Short-Channel Silicon Nanowire Devices.” ACS Nano. American Chemical Society, 2011. https://doi.org/10.1021/nn202524j. ieee: M. Mongillo, P. Spathis, G. Katsaros, P. Gentile, M. Sanquer, and S. De Franceschi, “Joule-assisted silicidation for short-channel silicon nanowire devices,” ACS Nano, vol. 5, no. 9. American Chemical Society, pp. 7117–7123, 2011. ista: Mongillo M, Spathis P, Katsaros G, Gentile P, Sanquer M, De Franceschi S. 2011. Joule-assisted silicidation for short-channel silicon nanowire devices. ACS Nano. 5(9), 7117–7123. mla: Mongillo, Massimo, et al. “Joule-Assisted Silicidation for Short-Channel Silicon Nanowire Devices.” ACS Nano, vol. 5, no. 9, American Chemical Society, 2011, pp. 7117–23, doi:10.1021/nn202524j. short: M. Mongillo, P. Spathis, G. Katsaros, P. Gentile, M. Sanquer, S. De Franceschi, ACS Nano 5 (2011) 7117–7123. date_created: 2018-12-11T11:53:50Z date_published: 2011-09-27T00:00:00Z date_updated: 2021-01-12T06:52:59Z day: '27' doi: 10.1021/nn202524j extern: '1' external_id: arxiv: - '1110.5668' intvolume: ' 5' issue: '9' language: - iso: eng main_file_link: - open_access: '1' url: http://arxiv.org/abs/1110.5668 month: '09' oa: 1 oa_version: Preprint page: 7117 - 7123 publication: ACS Nano publication_status: published publisher: American Chemical Society publist_id: '5370' quality_controlled: '1' status: public title: Joule-assisted silicidation for short-channel silicon nanowire devices type: journal_article user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 volume: 5 year: '2011' ...