--- _id: '11794' abstract: - lang: eng text: We study individual rational, Pareto optimal, and incentive compatible mechanisms for auctions with heterogeneous items and budget limits. For multi-dimensional valuations we show that there can be no deterministic mechanism with these properties for divisible items. We use this to show that there can also be no randomized mechanism that achieves this for either divisible or indivisible items. For single-dimensional valuations we show that there can be no deterministic mechanism with these properties for indivisible items, but that there is a randomized mechanism that achieves this for either divisible or indivisible items. The impossibility results hold for public budgets, while the mechanism allows private budgets, which is in both cases the harder variant to show. While all positive results are polynomial-time algorithms, all negative results hold independent of complexity considerations. alternative_title: - LNCS 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: Martin full_name: Starnberger, Martin last_name: Starnberger citation: ama: 'Dütting P, Henzinger MH, Starnberger M. Auctions with heterogeneous items and budget limits. In: 8th International Workshop on Internet and Network Economics. Vol 7695. Springer Nature; 2012:44–57. doi:10.1007/978-3-642-35311-6_4' apa: 'Dütting, P., Henzinger, M. H., & Starnberger, M. (2012). Auctions with heterogeneous items and budget limits. In 8th International Workshop on Internet and Network Economics (Vol. 7695, pp. 44–57). Liverpool, United Kingdom: Springer Nature. https://doi.org/10.1007/978-3-642-35311-6_4' chicago: Dütting, Paul, Monika H Henzinger, and Martin Starnberger. “Auctions with Heterogeneous Items and Budget Limits.” In 8th International Workshop on Internet and Network Economics, 7695:44–57. Springer Nature, 2012. https://doi.org/10.1007/978-3-642-35311-6_4. ieee: P. Dütting, M. H. Henzinger, and M. Starnberger, “Auctions with heterogeneous items and budget limits,” in 8th International Workshop on Internet and Network Economics, Liverpool, United Kingdom, 2012, vol. 7695, pp. 44–57. ista: 'Dütting P, Henzinger MH, Starnberger M. 2012. Auctions with heterogeneous items and budget limits. 8th International Workshop on Internet and Network Economics. WINE: International Conference on Web and Internet Economics, LNCS, vol. 7695, 44–57.' mla: Dütting, Paul, et al. “Auctions with Heterogeneous Items and Budget Limits.” 8th International Workshop on Internet and Network Economics, vol. 7695, Springer Nature, 2012, pp. 44–57, doi:10.1007/978-3-642-35311-6_4. short: P. Dütting, M.H. Henzinger, M. Starnberger, in:, 8th International Workshop on Internet and Network Economics, Springer Nature, 2012, pp. 44–57. conference: end_date: 2012-12-14 location: Liverpool, United Kingdom name: 'WINE: International Conference on Web and Internet Economics' start_date: 2012-12-11 date_created: 2022-08-11T11:32:25Z date_published: 2012-12-01T00:00:00Z date_updated: 2023-02-21T16:28:29Z day: '01' doi: 10.1007/978-3-642-35311-6_4 extern: '1' external_id: arxiv: - '1209.6448' intvolume: ' 7695' language: - iso: eng main_file_link: - open_access: '1' url: https://arxiv.org/abs/1209.6448 month: '12' oa: 1 oa_version: Preprint page: 44–57 publication: 8th International Workshop on Internet and Network Economics publication_identifier: isbn: - '9783642353109' issn: - 1611-3349 publication_status: published publisher: Springer Nature quality_controlled: '1' related_material: record: - id: '11794' relation: later_version status: public scopus_import: '1' status: public title: Auctions with heterogeneous items and budget limits type: conference user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 volume: 7695 year: '2012' ... --- _id: '11795' abstract: - lang: eng text: "We study multiple keyword sponsored search auctions with budgets. Each keyword has multiple ad slots with a click-through rate. The bidders have additive valuations, which are linear in the click-through rates, and budgets, which are restricting their overall payments. Additionally, the number of slots per keyword assigned to a bidder is bounded.\r\n\r\nWe show the following results: (1) We give the first mechanism for multiple keywords, where click-through rates differ among slots. Our mechanism is incentive compatible in expectation, individually rational in expectation, and Pareto optimal. (2) We study the combinatorial setting, where each bidder is only interested in a subset of the keywords. We give an incentive compatible, individually rational, Pareto optimal, and deterministic mechanism for identical click-through rates. (3) We give an impossibility result for incentive compatible, individually rational, Pareto optimal, and deterministic mechanisms for bidders with diminishing marginal valuations." alternative_title: - LNCS article_processing_charge: No author: - first_name: Riccardo full_name: Colini-Baldeschi, Riccardo last_name: Colini-Baldeschi - 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: Stefano full_name: Leonardi, Stefano last_name: Leonardi - first_name: Martin full_name: Starnberger, Martin last_name: Starnberger citation: ama: 'Colini-Baldeschi R, Henzinger MH, Leonardi S, Starnberger M. On multiple keyword sponsored search auctions with budgets. In: 39th International Colloquium on Automata, Languages, and Programming. Vol 7392. Springer Nature; 2012:1–12. doi:10.1007/978-3-642-31585-5_1' apa: 'Colini-Baldeschi, R., Henzinger, M. H., Leonardi, S., & Starnberger, M. (2012). On multiple keyword sponsored search auctions with budgets. In 39th International Colloquium on Automata, Languages, and Programming (Vol. 7392, pp. 1–12). Warwick, United Kingdom: Springer Nature. https://doi.org/10.1007/978-3-642-31585-5_1' chicago: Colini-Baldeschi, Riccardo, Monika H Henzinger, Stefano Leonardi, and Martin Starnberger. “On Multiple Keyword Sponsored Search Auctions with Budgets.” In 39th International Colloquium on Automata, Languages, and Programming, 7392:1–12. Springer Nature, 2012. https://doi.org/10.1007/978-3-642-31585-5_1. ieee: R. Colini-Baldeschi, M. H. Henzinger, S. Leonardi, and M. Starnberger, “On multiple keyword sponsored search auctions with budgets,” in 39th International Colloquium on Automata, Languages, and Programming, Warwick, United Kingdom, 2012, vol. 7392, pp. 1–12. ista: 'Colini-Baldeschi R, Henzinger MH, Leonardi S, Starnberger M. 2012. On multiple keyword sponsored search auctions with budgets. 39th International Colloquium on Automata, Languages, and Programming. ICALP: International Colloquium on Automata, Languages, and Programming, LNCS, vol. 7392, 1–12.' mla: Colini-Baldeschi, Riccardo, et al. “On Multiple Keyword Sponsored Search Auctions with Budgets.” 39th International Colloquium on Automata, Languages, and Programming, vol. 7392, Springer Nature, 2012, pp. 1–12, doi:10.1007/978-3-642-31585-5_1. short: R. Colini-Baldeschi, M.H. Henzinger, S. Leonardi, M. Starnberger, in:, 39th International Colloquium on Automata, Languages, and Programming, Springer Nature, 2012, pp. 1–12. conference: end_date: 2012-07-13 location: Warwick, United Kingdom name: 'ICALP: International Colloquium on Automata, Languages, and Programming' start_date: 2012-07-09 date_created: 2022-08-11T11:46:51Z date_published: 2012-07-01T00:00:00Z date_updated: 2023-02-21T16:28:31Z day: '01' doi: 10.1007/978-3-642-31585-5_1 extern: '1' intvolume: ' 7392' language: - iso: eng month: '07' oa_version: None page: 1–12 publication: 39th International Colloquium on Automata, Languages, and Programming publication_identifier: isbn: - '9783642315848' issn: - 0302-9743 publication_status: published publisher: Springer Nature quality_controlled: '1' related_material: record: - id: '11795' relation: later_version status: public scopus_import: '1' status: public title: On multiple keyword sponsored search auctions with budgets type: conference user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 volume: 7392 year: '2012' ... --- _id: '11964' abstract: - lang: eng text: A detailed investigation on the direct arylation of benzene with aryl bromides by using first-row transition metals under high-temperature/high-pressure (high-T/p) conditions is described. By employing a parallel reactor platform for rapid reaction screening and discovery at elevated temperatures, various metal/ligand/base combinations were evaluated for their ability to enable biaryl formation through C-H activation. The combination of cobalt(III) acetylacetonate and lithium bis(trimethylsilyl)amide was subjected to further process intensification at 200 °C (15 bar), allowing a significant reduction of the catalyst/base loading and a dramatic increase in catalytic efficiency (turnover frequency) by a factor of 1000 compared to traditional protocols. The high-throughput screening additionally identified novel nickel- and copper-based metal/ligand combinations that favored an amination pathway competing with C-H activation, with the addition of ligands, such as 1,10-phenanthroline, having a profound influence on the selectivity. In addition to metal-based catalysts, high-T/p process windows were also successfully applied to transition-metal-free systems, utilizing 1,10-phenanthroline as organocatalyst. 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: David full_name: Cantillo, David last_name: Cantillo - first_name: C. Oliver full_name: Kappe, C. Oliver last_name: Kappe citation: ama: 'Pieber B, Cantillo D, Kappe CO. Direct arylation of benzene with aryl bromides using high‐temperature/high‐pressure process windows: Expanding the scope of C-H activation chemistry. Chemistry – A European Journal. 2012;18(16):5047-5055. doi:10.1002/chem.201103748' apa: 'Pieber, B., Cantillo, D., & Kappe, C. O. (2012). Direct arylation of benzene with aryl bromides using high‐temperature/high‐pressure process windows: Expanding the scope of C-H activation chemistry. Chemistry – A European Journal. Wiley. https://doi.org/10.1002/chem.201103748' chicago: 'Pieber, Bartholomäus, David Cantillo, and C. Oliver Kappe. “Direct Arylation of Benzene with Aryl Bromides Using High‐temperature/High‐pressure Process Windows: Expanding the Scope of C-H Activation Chemistry.” Chemistry – A European Journal. Wiley, 2012. https://doi.org/10.1002/chem.201103748.' ieee: 'B. Pieber, D. Cantillo, and C. O. Kappe, “Direct arylation of benzene with aryl bromides using high‐temperature/high‐pressure process windows: Expanding the scope of C-H activation chemistry,” Chemistry – A European Journal, vol. 18, no. 16. Wiley, pp. 5047–5055, 2012.' ista: 'Pieber B, Cantillo D, Kappe CO. 2012. Direct arylation of benzene with aryl bromides using high‐temperature/high‐pressure process windows: Expanding the scope of C-H activation chemistry. Chemistry – A European Journal. 18(16), 5047–5055.' mla: 'Pieber, Bartholomäus, et al. “Direct Arylation of Benzene with Aryl Bromides Using High‐temperature/High‐pressure Process Windows: Expanding the Scope of C-H Activation Chemistry.” Chemistry – A European Journal, vol. 18, no. 16, Wiley, 2012, pp. 5047–55, doi:10.1002/chem.201103748.' short: B. Pieber, D. Cantillo, C.O. Kappe, Chemistry – A European Journal 18 (2012) 5047–5055. date_created: 2022-08-24T12:48:28Z date_published: 2012-04-16T00:00:00Z date_updated: 2023-02-21T10:09:35Z day: '16' doi: 10.1002/chem.201103748 extern: '1' external_id: pmid: - '22396386' intvolume: ' 18' issue: '16' language: - iso: eng month: '04' oa_version: None page: 5047-5055 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: 'Direct arylation of benzene with aryl bromides using high‐temperature/high‐pressure process windows: Expanding the scope of C-H activation chemistry' type: journal_article user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 volume: 18 year: '2012' ... --- _id: '11963' abstract: - lang: eng text: 'Peroxides and ethers in flow: 2-Carbonyl-substituted phenols and β-ketoesters react safely with ethers in a microreactor environment using a copper catalyst and an organic peroxide (TBHP). This protocol results in unsymmetrical acetal scaffolds not easily available otherwise (see scheme).' article_processing_charge: No article_type: letter_note author: - first_name: G. Sathish full_name: Kumar, G. Sathish last_name: Kumar - first_name: Bartholomäus full_name: Pieber, Bartholomäus id: 93e5e5b2-0da6-11ed-8a41-af589a024726 last_name: Pieber orcid: 0000-0001-8689-388X - first_name: K. Rajender full_name: Reddy, K. Rajender last_name: Reddy - first_name: C. Oliver full_name: Kappe, C. Oliver last_name: Kappe citation: ama: Kumar GS, Pieber B, Reddy KR, Kappe CO. Copper-catalyzed formation of C-O bonds by direct α-C-H bond activation of ethers using stoichiometric amounts of peroxide in batch and continuous-flow formats. Chemistry - A European Journal. 2012;18(20):6124-6128. doi:10.1002/chem.201200815 apa: Kumar, G. S., Pieber, B., Reddy, K. R., & Kappe, C. O. (2012). Copper-catalyzed formation of C-O bonds by direct α-C-H bond activation of ethers using stoichiometric amounts of peroxide in batch and continuous-flow formats. Chemistry - A European Journal. Wiley. https://doi.org/10.1002/chem.201200815 chicago: Kumar, G. Sathish, Bartholomäus Pieber, K. Rajender Reddy, and C. Oliver Kappe. “Copper-Catalyzed Formation of C-O Bonds by Direct α-C-H Bond Activation of Ethers Using Stoichiometric Amounts of Peroxide in Batch and Continuous-Flow Formats.” Chemistry - A European Journal. Wiley, 2012. https://doi.org/10.1002/chem.201200815. ieee: G. S. Kumar, B. Pieber, K. R. Reddy, and C. O. Kappe, “Copper-catalyzed formation of C-O bonds by direct α-C-H bond activation of ethers using stoichiometric amounts of peroxide in batch and continuous-flow formats,” Chemistry - A European Journal, vol. 18, no. 20. Wiley, pp. 6124–6128, 2012. ista: Kumar GS, Pieber B, Reddy KR, Kappe CO. 2012. Copper-catalyzed formation of C-O bonds by direct α-C-H bond activation of ethers using stoichiometric amounts of peroxide in batch and continuous-flow formats. Chemistry - A European Journal. 18(20), 6124–6128. mla: Kumar, G. Sathish, et al. “Copper-Catalyzed Formation of C-O Bonds by Direct α-C-H Bond Activation of Ethers Using Stoichiometric Amounts of Peroxide in Batch and Continuous-Flow Formats.” Chemistry - A European Journal, vol. 18, no. 20, Wiley, 2012, pp. 6124–28, doi:10.1002/chem.201200815. short: G.S. Kumar, B. Pieber, K.R. Reddy, C.O. Kappe, Chemistry - A European Journal 18 (2012) 6124–6128. date_created: 2022-08-24T12:33:05Z date_published: 2012-05-14T00:00:00Z date_updated: 2023-02-21T10:09:33Z day: '14' doi: 10.1002/chem.201200815 extern: '1' external_id: pmid: - '22492535' intvolume: ' 18' issue: '20' language: - iso: eng month: '05' oa_version: None page: 6124-6128 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: Copper-catalyzed formation of C-O bonds by direct α-C-H bond activation of ethers using stoichiometric amounts of peroxide in batch and continuous-flow formats type: journal_article user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 volume: 18 year: '2012' ... --- _id: '12644' abstract: - lang: eng text: In the Dry Andes of central Chile, summer water resources originate mostly from snowmelt and ice melt. We use the physically based, spatially distributed hydrological model TOPKAPI to study the exchange between glaciers and climate in the upper Aconcagua River Basin during the summer season and identify the model parameters that are robust and transferable and those that are more dependent on calibration. TOPKAPI has recently been adapted to incorporate an enhanced temperature index approach for snow and ice melting. We suggest a calibration procedure that allows calibration of parameters in three steps by separating parameters governing distinct processes. We evaluate the parameters' transferability in time and in space by applying the model at two spatial scales. TOPKAPI's ability to simulate the relevant processes is tested against meteorological, ablation, and glacier runoff data measured on Juncal Norte Glacier during two glacier ablation seasons. The model was applied successfully to the climatic setting of the Dry Andes once its parameters were recalibrated. We found a clear distinction between parameters that are stable in time and those that need recalibration. The parameters of the melt model are transferable from one season to the other, while the parameters governing the extrapolation of meteorological input data and the routing of glacier meltwater need recalibration from one season to the other. Sensitivity analysis revealed that the model is most sensitive to the temperature lapse rate governing the extrapolation of air temperature from point measurements to the glacier scale and to the melt parameter that multiplies the shortwave radiation balance. article_number: W03509 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 citation: ama: 'Ragettli S, Pellicciotti F. Calibration of a physically based, spatially distributed hydrological model in a glacierized basin: On the use of knowledge from glaciometeorological processes to constrain model parameters. Water Resources Research. 2012;48(3). doi:10.1029/2011wr010559' apa: 'Ragettli, S., & Pellicciotti, F. (2012). Calibration of a physically based, spatially distributed hydrological model in a glacierized basin: On the use of knowledge from glaciometeorological processes to constrain model parameters. Water Resources Research. American Geophysical Union. https://doi.org/10.1029/2011wr010559' chicago: 'Ragettli, S., and Francesca Pellicciotti. “Calibration of a Physically Based, Spatially Distributed Hydrological Model in a Glacierized Basin: On the Use of Knowledge from Glaciometeorological Processes to Constrain Model Parameters.” Water Resources Research. American Geophysical Union, 2012. https://doi.org/10.1029/2011wr010559.' ieee: 'S. Ragettli and F. Pellicciotti, “Calibration of a physically based, spatially distributed hydrological model in a glacierized basin: On the use of knowledge from glaciometeorological processes to constrain model parameters,” Water Resources Research, vol. 48, no. 3. American Geophysical Union, 2012.' ista: 'Ragettli S, Pellicciotti F. 2012. Calibration of a physically based, spatially distributed hydrological model in a glacierized basin: On the use of knowledge from glaciometeorological processes to constrain model parameters. Water Resources Research. 48(3), W03509.' mla: 'Ragettli, S., and Francesca Pellicciotti. “Calibration of a Physically Based, Spatially Distributed Hydrological Model in a Glacierized Basin: On the Use of Knowledge from Glaciometeorological Processes to Constrain Model Parameters.” Water Resources Research, vol. 48, no. 3, W03509, American Geophysical Union, 2012, doi:10.1029/2011wr010559.' short: S. Ragettli, F. Pellicciotti, Water Resources Research 48 (2012). date_created: 2023-02-20T08:17:39Z date_published: 2012-03-01T00:00:00Z date_updated: 2023-02-21T09:38:36Z day: '01' doi: 10.1029/2011wr010559 extern: '1' intvolume: ' 48' issue: '3' language: - iso: eng main_file_link: - open_access: '1' url: https://doi.org/10.1029/2011WR010559 month: '03' 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: 'Calibration of a physically based, spatially distributed hydrological model in a glacierized basin: On the use of knowledge from glaciometeorological processes to constrain model parameters' type: journal_article user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 volume: 48 year: '2012' ...