TY - JOUR A1 - Thiele, Lukas A1 - Pruin, Andree T1 - Does large-scale digital collaboration contribute to crisis management? T1 - Digitale Massenkollaboration als Teil von staatlichem Krisenmanagement? BT - an analysis of projects from the #WirVsVirus hackathon implemented in Germany during the COVID-19 pandemic BT - eine Analyse von Projekten aus dem #WirVsVirus-Hackathon in Deutschland JF - der moderne staat – Zeitschrift für Public Policy, Recht und Management N2 - In recent years, collaborative approaches to crisis management involving citizens have gained increasing attention. One example is the #WirVsVirus hackathon, which was conducted in response to the COVID-19 pandemic and had over 28,000 participants. Because research on large-scale, digital collaboration in crisis situations is scarce, consequences of their use in crisis management remain unclear. This article relies on the open governance paradigm as a lens for studying two projects emerging from the hackathon. Based on nine qualitative expert interviews, we ask how digital open governance affects governance capacity and legitimacy in crisis management. Our findings suggest that digital open governance can contribute to governance capacity and legitimacy, as it mobilises large, diverse groups of citizens to quickly develop citizen-centric, ready-to-use solutions for crisisrelated problems. However, we also identified potential problems, including risks regarding legitimacy and accountability, difficulties with scalable solutions, and questionable long-term impacts. N2 - Kollaborative, partizipative Instrumente zur Krisenbekämpfung haben in den letzten Jahren zunehmend an Aufmerksamkeit gewonnen. Ein Beispiel hierfür ist der #WirVsVirus-Hackathon, der als Reaktion auf die COVID-19-Pandemie durchgeführt wurde und über 28.000 Teilnehmer:innen erreichte. Bislang wurden die Auswirkungen solch groß angelegter, kollaborativer Ansätze zur Krisenbewältigung auf staatliches Krisenmanagement nur selten untersucht. Diese Studie analysiert den Hackathon und die daraus entstandenen Projekte aus der Perspektive des Open Governance-Paradigmas. Auf Grundlage von neun Experteninterviews untersuchen wir, wie sich digitale Open Governance auf die Regierungsfähigkeit und Legitimität in Krisenzeiten auswirkt. Unsere Analyse zeigt, dass digitale Open Governance zur Leistungsfähigkeit und Legitimität staatlichen Handelns in Krisenzeiten beitragen kann, da solche Projekte eine breite und diverse Teilnehmerschaft mobilisieren und in kurzer Zeit bürgerzentrierte, nutzbare Lösungen für krisenbezogene Probleme entwickeln können. Dem stehen allerdings Zweifel an der langfristigen Beständigkeit der Projekte, ihrer Skalierbarkeit, sowie Risiken hinsichtlich der Legitimität und Rechenschaftspflicht entgegen. KW - open governance KW - crisis management KW - capacity KW - legitimacy KW - hackathon KW - Open Governance KW - Krisenmanagement KW - Staatliche Leistungsfähigkeit KW - Legitimität KW - Hackathon Y1 - 2021 U6 - https://doi.org/10.3224/dms.v14i2.07 SN - 1865-7192 VL - 14 IS - 2-2021 SP - 334 EP - 350 PB - Verlag Barbara Budrich CY - Leverkusen-Opladen ER - TY - JOUR A1 - Heim, Birgit A1 - Lisovski, Simeon A1 - Wieczorek, Mareike A1 - Morgenstern, Anne A1 - Juhls, Bennet A1 - Shevtsova, Iuliia A1 - Kruse, Stefan A1 - Boike, Julia A1 - Fedorova, Irina A1 - Herzschuh, Ulrike T1 - Spring snow cover duration and tundra greenness in the Lena Delta, Siberia BT - two decades of MODIS satellite time series (2001-2021) JF - Environmental research letters N2 - The Lena Delta in Siberia is the largest delta in the Arctic and as a snow-dominated ecosystem particularly vulnerable to climate change. Using the two decades of MODerate resolution Imaging Spectroradiometer satellite acquisitions, this study investigates interannual and spatial variability of snow-cover duration and summer vegetation vitality in the Lena Delta. We approximated snow by the application of the normalized difference snow index and vegetation greenness by the normalized difference vegetation index (NDVI). We consolidated the analyses by integrating reanalysis products on air temperature from 2001 to 2021, and air temperature, ground temperature, and the date of snow-melt from time-lapse camera (TLC) observations from the Samoylov observatory located in the central delta. We extracted spring snow-cover duration determined by a latitudinal gradient. The 'regular year' snow-melt is transgressing from mid-May to late May within a time window of 10 days across the delta. We calculated yearly deviations per grid cell for two defined regions, one for the delta, and one focusing on the central delta. We identified an ensemble of early snow-melt years from 2012 to 2014, with snow-melt already starting in early May, and two late snow-melt years in 2004 and 2017, with snow-melt starting in June. In the times of TLC recording, the years of early and late snow-melt were confirmed. In the three summers after early snow-melt, summer vegetation greenness showed neither positive nor negative deviations. Whereas, vegetation greenness was reduced in 2004 after late snow-melt together with the lowest June monthly air temperature of the time series record. Since 2005, vegetation greenness is rising, with maxima in 2018 and 2021. The NDVI rise since 2018 is preceded by up to 4 degrees C warmer than average June air temperature. The ongoing operation of satellite missions allows to monitor a wide range of land surface properties and processes that will provide urgently needed data in times when logistical challenges lead to data gaps in land-based observations in the rapidly changing Arctic. KW - Arctic vegetation KW - tundra KW - snow cover duration KW - NDVI KW - NDSI KW - MODIS KW - Lena Delta Y1 - 2022 U6 - https://doi.org/10.1088/1748-9326/ac8066 SN - 1748-9326 VL - 17 IS - 8 PB - IOP Publ. Ltd. CY - Bristol ER - TY - JOUR A1 - Daskalopoulou, Kyriaki A1 - D'Alessandro, Walter A1 - Longo, Manfredi A1 - Pecoraino, Giovannella A1 - Calabrese, Sergio T1 - Shallow sea gas manifestations in the Aegean Sea (Greece) as natural analogs to study ocean acidification BT - first catalog and geochemical characterization JF - Frontiers in Marine Science N2 - The concepts of CO2 emission, global warming, climate change, and their environmental impacts are of utmost importance for the understanding and protection of the ecosystems. Among the natural sources of gases into the atmosphere, the contribution of geogenic sources plays a crucial role. However, while subaerial emissions are widely studied, submarine outgassing is not yet well understood. In this study, we review and catalog 122 literature and unpublished data of submarine emissions distributed in ten coastal areas of the Aegean Sea. This catalog includes descriptions of the degassing vents through in situ observations, their chemical and isotopic compositions, and flux estimations. Temperatures and pH data of surface seawaters in four areas affected by submarine degassing are also presented. This overview provides useful information to researchers studying the impact of enhanced seawater CO2 concentrations related either to increasing CO2 levels in the atmosphere or leaking carbon capture and storage systems. KW - CO2 emissions KW - submarine gas vents KW - geogenic degassing KW - environmental KW - impact KW - Greek Islands KW - gas flux Y1 - 2022 U6 - https://doi.org/10.3389/fmars.2021.775247 SN - 2296-7745 VL - 8 PB - Frontiers Media CY - Lausanne ER - TY - CHAP A1 - Pruin, Andree ED - Randma-Liiv, Tiina ED - Lember, Veiko T1 - How organizational factors shape e-participation BT - lessons from the German one-stop participation portal meinBerlin T2 - Engaging citizens in policy making : e-participation practices in Europe Y1 - 2022 SN - 9781800374362 SN - 9781800374355 U6 - https://doi.org/10.4337/9781800374362.00022 SP - 209 EP - 224 PB - Edward Elgar Publishing CY - Cheltenham, UK and Northampton, MA ER - TY - JOUR A1 - Montes-Osuna, Nuria A1 - Cernava, Tomislav A1 - Gomez-Lama Cabanas, Carmen A1 - Berg, Gabriele A1 - Mercado-Blanco, Jesus T1 - Identification of volatile organic compounds emitted by two beneficial endophytic pseudomonas strains from olive roots JF - Plants N2 - The production of volatile organic compounds (VOCs) represents a promising strategy of plant-beneficial bacteria to control soil-borne phytopathogens. Pseudomonas sp. PICF6 and Pseudomonas simiae PICF7 are two indigenous inhabitants of olive roots displaying effective biological control against Verticillium dahliae. Additionally, strain PICF7 is able to promote the growth of barley and Arabidopsis thaliana, VOCs being involved in the growth of the latter species. In this study, the antagonistic capacity of these endophytic bacteria against relevant phytopathogens (Verticillium spp., Rhizoctonia solani, Sclerotinia sclerotiorum and Fusarium oxysporum f.sp. lycopersici) was assessed. Under in vitro conditions, PICF6 and PICF7 were only able to antagonize representative isolates of V. dahliae and V. longisporum. Remarkably, both strains produced an impressive portfolio of up to twenty VOCs, that included compounds with reported antifungal (e.g., 1-undecene, (methyldisulfanyl) methane and 1-decene) or plant growth promoting (e.g., tridecane, 1-decene) activities. Moreover, their volatilomes differed strongly in the absence and presence of V. dahliae. For example, when co incubated with the defoliating pathotype of V. dahliae, the antifungal compound 4-methyl-2,6-bis(2-methyl-2-propanyl)phenol was produced. Results suggest that volatiles emitted by these endophytes may differ in their modes of action, and that potential benefits for the host needs further investigation in planta. KW - biological control agents KW - olive rhizobacteria KW - Pseudomonas sp KW - PICF6 KW - Pseudomonas simiae PICF7 KW - root endophytes KW - Verticillium dahliae KW - volatilome Y1 - 2022 U6 - https://doi.org/10.3390/plants11030318 SN - 2223-7747 VL - 11 IS - 3 PB - MDPI CY - Basel ER - TY - JOUR A1 - Andersson, Edvin K. W. A1 - Sångeland, Christofer A1 - Berggren, Elin A1 - Johansson, Fredrik O. L. A1 - Kühn, Danilo A1 - Lindblad, Andreas A1 - Mindemark, Jonas A1 - Hahlin, Maria T1 - Early-stage decomposition of solid polymer electrolytes in Li-metal batteries JF - Journal of materials chemistry : A, Materials for energy and sustainability N2 - Development of functional and stable solid polymer electrolytes (SPEs) for battery applications is an important step towards both safer batteries and for the realization of lithium-based or anode-less batteries. The interface between the lithium and the solid polymer electrolyte is one of the bottlenecks, where severe degradation is expected. Here, the stability of three different SPEs - poly(ethylene oxide) (PEO), poly(epsilon-caprolactone) (PCL) and poly(trimethylene carbonate) (PTMC) - together with lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) salt, is investigated after they have been exposed to lithium metal under UHV conditions. Degradation compounds, e.g. Li-O-R, LiF and LixSyOz, are identified for all SPEs using soft X-ray photoelectron spectroscopy. A competing degradation between polymer and salt is identified in the outermost surface region (<7 nm), and is dependent on the polymer host. PTMC:LiTFSI shows the most severe decomposition of both polymer and salt followed by PCL:LiTFSI and PEO:LiTFSI. In addition, the movement of lithium species through the decomposed interface shows large variation depending on the polymer electrolyte system. Y1 - 2021 U6 - https://doi.org/10.1039/d1ta05015j SN - 2050-7488 SN - 2050-7496 VL - 9 IS - 39 SP - 22462 EP - 22471 PB - Royal Society of Chemistry CY - Cambridge ER - TY - JOUR A1 - Wormell, Caroline L. A1 - Reich, Sebastian T1 - Spectral convergence of diffusion maps BT - Improved error bounds and an alternative normalization JF - SIAM journal on numerical analysis / Society for Industrial and Applied Mathematics N2 - Diffusion maps is a manifold learning algorithm widely used for dimensionality reduction. Using a sample from a distribution, it approximates the eigenvalues and eigenfunctions of associated Laplace-Beltrami operators. Theoretical bounds on the approximation error are, however, generally much weaker than the rates that are seen in practice. This paper uses new approaches to improve the error bounds in the model case where the distribution is supported on a hypertorus. For the data sampling (variance) component of the error we make spatially localized compact embedding estimates on certain Hardy spaces; we study the deterministic (bias) component as a perturbation of the Laplace-Beltrami operator's associated PDE and apply relevant spectral stability results. Using these approaches, we match long-standing pointwise error bounds for both the spectral data and the norm convergence of the operator discretization. We also introduce an alternative normalization for diffusion maps based on Sinkhorn weights. This normalization approximates a Langevin diffusion on the sample and yields a symmetric operator approximation. We prove that it has better convergence compared with the standard normalization on flat domains, and we present a highly efficient rigorous algorithm to compute the Sinkhorn weights. KW - diffusion maps KW - graph Laplacian KW - Sinkhorn problem KW - kernel methods Y1 - 2021 U6 - https://doi.org/10.1137/20M1344093 SN - 0036-1429 SN - 1095-7170 VL - 59 IS - 3 SP - 1687 EP - 1734 PB - Society for Industrial and Applied Mathematics CY - Philadelphia ER - TY - JOUR A1 - Ortiz, Gustavo A1 - Saez, Mauro A1 - Alvarado, Patricia A1 - Rivas, Carolina A1 - García, Víctor Hugo A1 - Alonso, Ricardo A1 - Zullo, Fernando Morales T1 - Seismotectonic characterization of the 1948 (M-W 6.9) Anta earthquake Santa Barbara System, central Andes broken foreland of northwestern Argentina JF - Journal of South American earth sciences N2 - The region of the Andean back-arc of northwestern Argentina has been struck by several magnitude >= 6 crustal earthquakes since the first historically recorded event in 1692. One of these events corresponds to the Anta earthquake on 25 August 1948, with epicenter in the Santa Barbara System causing three deaths and severe damage in Salta and Jujuy provinces with maximum Modified Mercalli seismic intensities (MMI) of IX. We collected and digitized analog seismograms of this earthquake from worldwide seismic observatories in order to perform first-motion analysis and modeling of long-period teleseismic P-waveforms. Our results indicate a simple seismic source of M0 = 2.85 x 1019 N m consistent with a moment magnitude Mw = 6.9. We have also tested for the focal depth determining a shallow source at 8 km with a reverse focal mechanism solution with a minor dextral strike-slip component (strike 20 degrees, dip 30 degrees, rake 120 degrees) from the best fit of waveforms. Using magnitude size empirical relationships, the comparison of the obtained Mw 6.9 magnitude value and the ca. 10,000 km2 area of MMI >= IX from our seismic intensity map, which was obtained from newspaper and many historical reports, indicates a rupture length of 42 +/- 8 km for the Anta earthquake. We show our results in a 3D geological model around the epicentral area, which integrates modern seismicity, geological data, and information of a previously studied east-west cross section located a few kilometers south of the 1948 epicenter. The integration of all available information provides evidence of the re-activation of the Pie de la Sierra del Gallo fault during the 1948 Mw 6.9 shallow earthquake; this thrust fault bounds the Santa Barbara System along its western foothill. KW - Active tectonics KW - Analog historical seismograms KW - Andean back-arc; KW - Thick-skinned tectonics KW - Central Andes Y1 - 2022 U6 - https://doi.org/10.1016/j.jsames.2022.103822 SN - 0895-9811 SN - 1873-0647 VL - 116 PB - Elsevier CY - Oxford ER - TY - JOUR A1 - Cseh, Ágnes A1 - Juhos, Attila T1 - Pairwise preferences in the stable marriage problem JF - ACM Transactions on Economics and Computation / Association for Computing Machinery N2 - We study the classical, two-sided stable marriage problem under pairwise preferences. In the most general setting, agents are allowed to express their preferences as comparisons of any two of their edges, and they also have the right to declare a draw or even withdraw from such a comparison. This freedom is then gradually restricted as we specify six stages of orderedness in the preferences, ending with the classical case of strictly ordered lists. We study all cases occurring when combining the three known notions of stability-weak, strong, and super-stability-under the assumption that each side of the bipartite market obtains one of the six degrees of orderedness. By designing three polynomial algorithms and two NP-completeness proofs, we determine the complexity of all cases not yet known and thus give an exact boundary in terms of preference structure between tractable and intractable cases. KW - Stable marriage KW - intransitivity KW - acyclic preferences KW - poset KW - weakly KW - stable matching KW - strongly stable matching KW - super stable matching Y1 - 2021 U6 - https://doi.org/10.1145/3434427 SN - 2167-8375 SN - 2167-8383 VL - 9 IS - 1 PB - Association for Computing Machinery CY - New York ER - TY - JOUR A1 - Liu, Liquan A1 - Götz, Antonia A1 - Lorette, Pernelle A1 - Tyler, Michael D. T1 - How tone, intonation and emotion shape the development of infants' fundamental frequency perception JF - Frontiers in psychology N2 - Fundamental frequency (integral(0)), perceived as pitch, is the first and arguably most salient auditory component humans are exposed to since the beginning of life. It carries multiple linguistic (e.g., word meaning) and paralinguistic (e.g., speakers' emotion) functions in speech and communication. The mappings between these functions and integral(0) features vary within a language and differ cross-linguistically. For instance, a rising pitch can be perceived as a question in English but a lexical tone in Mandarin. Such variations mean that infants must learn the specific mappings based on their respective linguistic and social environments. To date, canonical theoretical frameworks and most empirical studies do not view or consider the multi-functionality of integral(0), but typically focus on individual functions. More importantly, despite the eventual mastery of integral(0) in communication, it is unclear how infants learn to decompose and recognize these overlapping functions carried by integral(0). In this paper, we review the symbioses and synergies of the lexical, intonational, and emotional functions that can be carried by integral(0) and are being acquired throughout infancy. On the basis of our review, we put forward the Learnability Hypothesis that infants decompose and acquire multiple integral(0) functions through native/environmental experiences. Under this hypothesis, we propose representative cases such as the synergy scenario, where infants use visual cues to disambiguate and decompose the different integral(0) functions. Further, viable ways to test the scenarios derived from this hypothesis are suggested across auditory and visual modalities. Discovering how infants learn to master the diverse functions carried by integral(0) can increase our understanding of linguistic systems, auditory processing and communication functions. KW - lexical tone KW - intonation, Prosody KW - phonological theory KW - sensory processing KW - cognitive processing KW - cross-linguistic transfer KW - emotional tone Y1 - 2022 U6 - https://doi.org/10.3389/fpsyg.2022.906848 SN - 1664-1078 VL - 13 PB - Frontiers Research Foundation CY - Lausanne ER -