Browsing by Affiliation "Goethe University Frankfurt"
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- Research DataA j_eff 12 Kitaev material on the triangular lattice: The case of NaRuO22023-06-07Motivated by recent reports of a quantum disordered ground state in the triangular lattice compound NaRuO$_2$, we derive a $j_{\rm eff}=1/2$ magnetic model for this system by means of first-principles calculations. The pseudospin Hamiltonian is dominated by bond-dependent off-diagonal $\Gamma$ interactions, complemented by a ferromagnetic Heisenberg exchange and a notably \emph{antiferromagnetic} Kitaev term. In addition to bilinear interactions, we find a sizable four-spin ring exchange contribution with a \emph{strongly anisotropic} character, which has been so far overlooked when modeling Kitaev materials. The analysis of the magnetic model, based on the minimization of the classical energy and exact diagonalization of the quantum Hamiltonian, points toward the existence of a rather robust easy-plane ferromagnetic order, which cannot be easily destabilized by physically relevant perturbations.
339 37 - Research DataAbschlussbericht zum DFG-Projekt "Die deutschen ethnographischen Expeditionen in die Kimberley-Region, Nordwest-Australien. Forschungsgeschichtliche Bedeutung, digitale Repatriierung und gemeinsame Interpretation des indigenen Kulturerbes"2025-04-14The aim of this project is to develop the first stage of a systematic and collaborative assessment of the German ethnographic expeditions to the Northwest Kimberley that were conducted by the Institut fur Kulturmorphologie (now Frobenius Institute, Frankfurt am Main) in 1938 and 1939 and the then Museum fur Volkerkunde (Munich) in 1954 and 1955. These expeditions were both conducted by researchers, who were originally associated with Leo Frobenius and they were among the first dedicated ethnographic/anthropological expeditions into this part of Australia. They were also the first to specifically record rock art images and accompanying narratives. This latter aspect is particularly significant, because the researchers worked within the region of the Aboriginal Wandjina Wunggurr communities, who continue to preserve a cultural tradition in which rock art constitute integral elements until the present day. The expeditions have produced an extensive amount of materials that is distributed across a number of institutions in Germany. These largely unpublished materials comprise archival materials, ethnographic objects, reproductions of rock art images as well as an extensive collection of photographs. Although a limited number of publications by the members of these expeditions have been produced in German after WWII, the materials themselves have never been assessed using modern critical methods and techniques. Most importantly, they have never been examined together with members of the relevant Aboriginal communities and information about the materials and archival records has not been made available to the Aboriginal communities in accessible and culturally-sensitive ways. In summary, the project is intended to contribute towards a critical analysis of these expeditions and the respective collections, using systematic historical and anthropological methods in collaboration with the relevant Aboriginal communities. The latter will profit from the results as materials will be made accessible to community members in responsible and culturally-sensitive ways in digital form through the respective Aboriginal community archive(s) as well as appropriate publications. The project will contribute to key areas of debate concerning ethnographic museums and collections in Germany today. The outcomes are intended to be of academic character and value and to make suggestions for standards how to deal with a heritage shared between German institutions and Indigenous communities. Furthermore, the project results will be made available to a larger public through a travelling exhibition, developed in an international collaboration between the Mowanjum Arts Centre (Kimberley, Australia), the Western Australian Museum (Perth) and the relevant museums and institutions in Germany (Museum der Weltkulturen and Frobenius-Institut in Frankfurt am Main; as well as Museum Funf Kontinente in Munich).
25 13 - Research DataAdditional WaterGAP v2.2e Model Outputs for Climate Change Impact Assessment on Global Water Resources2024-10-30Jackson, LorenzAssessing global freshwater resources and human water use is of value for a number of needs but challenging. The global water use and water availability model WaterGAP has been in development since 1996 and has served a range of applications such as assessments of global water resources and water stress, also under the impact of climate change, drought hazard quantification, Life Cycle Assessments, water (over)use and consequently depletion of water resources and a better understanding of terrestrial water storage variations (jointly with satellite observations). Here, the reader can download model output for the time periods 1850 to 2014 (historical) and 2015 to 2100 (SSP126, SSP585) that was computed by driving WaterGAP v2.2e by 5 GCM input datasets (climate forcings). Though not part of the official ISIMIP3b repository, these datasets adhere to ISIMIP guidelines and are stored here to support replication of analyses conducted in Lorenz Jackson's master’s thesis (2024) regarding potential future climate change impacts on global water resources (for details see the model description paper of v2.2e, currently accepted 10.5194/gmd-2023-213).
89 52 - Research DataNMR structure and dynamics of the stem loop II motif (s2m) from the Omicron variant of SARS-CoV-22025-04-30The stem-loop-II motif (s2m) is a conserved viral RNA element located in the 3’UTR of different viruses including SARS-CoV-2. High resolution 3D structural data for s2m is only available for the fundamentally different SCoV-1 version and difficult to access for SARS-CoV-2 due to the highly dynamic nature of the RNA element. With the omicron variant a large deletion occurred for s2m resulting in a relatively short hairpin with an apical pentaloop. We attempted to determine the NMR solution structure of s2m_omicron by including CCRs and J-coupling derived dihedral restraints in addition to NOE distance restraints. Surprisingly, relatively high 1H,13C heteronuclear NOE values, averaged ribose 3JHH-couplings (H1’H2’; H3’H4’) and dipole(H1’-C1’) dipole(H6/8-C6/8)-CCRs hinted towards significant dynamics for the small pentaloop making structure calculations solely relying on NMR data insufficient. To address this problem, we performed MD-simulations with the NMR structure bundle as a starting point and applied BME reweighting to refine the ensemble with the 3J-coupling data. Our results provide a detailed view of the conformational dynamics of the omicron variant of s2m characterized by different stacking patterns, ribose repuckering and overall heterogeneity of the torsion angles for the loop nucleotides. Strikingly, despite the deletion of the initial nonaloop, as present in the Wuhan and Delta variants of s2m, a dynamic UAC triplet is conserved at the tip of the pentaloop hinting towards a possible connection to the still unknown function of the RNA element.
18 7 - Research DataSection-Type Constraints on the Choice of Linguistic Mechanisms in Research Articles: A Corpus-Based Approach2023This thesis investigates the structure of research articles in the field of Computational Linguistics with the goal of establishing that a set of distinctive linguistic features is associated with each section type. The empirical results of the study are derived from the quantitative and qualitative evaluation of research articles from the ACL Anthology Corpus. More than 20,000 articles were analyzed for the purpose of retrieving the target section types and extracting the predefined set of linguistic features from them. Approximately 1,100 articles were found to contain all of the following five section types: abstract, introduction, related work, discussion, and conclusion. These were chosen for the purpose of comparing the frequency of occurrence of the linguistic features across the section types. Making use of frameworks for Natural Language Processing, the Stanford CoreNLP Module, and the Python library SpaCy, as well as scripts created by the author, the frequency scores of the features were retrieved and analyzed with state-of-the-art statistical techniques. The results show that each section type possesses an individual profile of linguistic features which are associated with it more or less strongly. These section-feature associations are shown to be derivable from the hypothesized purpose of each section type. Overall, the findings reported in this thesis provide insights into the writing strategies that authors employ so that the overall goal of the research paper is achieved. The results of the thesis can find implementation in new state-of-the-art applications that assist academic writing and its evaluation in a way that provides the user with a more sophisticated, empirically based feedback on the relationship between linguistic mechanisms and text type. In addition, the potential of the identification of text-type specific linguistic characteristics (a text-feature mapping) can contribute to the development of more robust language-based models for disinformation detection.
244 9 - Research DataTEI/XML encoded transcription Na_50-72 from the Arthur Schopenhauer Legacy2025-03-21This document is a TEI/XML encoded transcription of the document Na_50-72 from the Arthur Schopenhauer Legacy - 'Schopenhauer-Archive': "Antwortschreiben nach dem Erhalt zweier Briefe Schopenhauers" from Jean Anthime Grégoire de Blésimaire to Arthur Schopenhauer Transcribed by Daniel Dudde, TEI encoded by Yannick Hohmann-Huet (https://sammlungen.ub.uni-frankfurt.de/schopenhauer/content/titleinfo/4235342)
17 2 - Research DataThe global water resources and use model WaterGAP v2.2e - daily water storage model output driven by gswp3-era5 and historical setup of direct human impacts2024-04-04Trautmann, TimAckermann, SebastianCáceres, DeniseFlörke, MartinaGerdener, HelenaKynast, EllenPeiris, Thedini AsaliSchiebener, LeonieSchumacher, MaikeAssessing global freshwater resources and human water use is of value for a number of needs but challenging. The global water use and water availability model WaterGAP has been in development since 1996 and has served a range of applications such as assessments of global water resources and water stress, also under the impact of climate change, drought hazard quantification, Life Cycle Assessments, water (over)use and consequently depletion of water resources and a better understanding of terrestrial water storage variations (jointly with satellite observations). Here, the reader can download daily model output for water storage variables for the time period 1901-2019 (2023) that was computed by driving WaterGAP v2.2e by two alternative climate datasets (climate forcings) that were generated in the ISIMIP context (https://www.isimip.org) and are described in https://data.isimip.org/10.48364/ISIMIP.982724. In the paper connected to this dataset (in review with Geoscientific Model Development), the newest model version, WaterGAP v2.2e is described by providing the modifications to the previous version v2.2d (Müller Schmied et al. 2021) and the corresponding changes in model output. Here, the single water storage compartments and terrestrial (total) water storage are provided.
152 51 - Research DataThe global water resources and use model WaterGAP v2.2e - daily water storage model output driven by gswp3-w5e5 and historical setup of direct human impacts2024-04-04Trautmann, TimAckermann, SebastianCáceres, DeniseFlörke, MartinaGerdener, HelenaKynast, EllenPeiris, Thedini AsaliSchiebener, LeonieSchumacher, MaikeAssessing global freshwater resources and human water use is of value for a number of needs but challenging. The global water use and water availability model WaterGAP has been in development since 1996 and has served a range of applications such as assessments of global water resources and water stress, also under the impact of climate change, drought hazard quantification, Life Cycle Assessments, water (over)use and consequently depletion of water resources and a better understanding of terrestrial water storage variations (jointly with satellite observations). Here, the reader can download daily model output for water storage variables for the time period 1901-2019 (2023) that was computed by driving WaterGAP v2.2e by two alternative climate datasets (climate forcings) that were generated in the ISIMIP context (https://www.isimip.org) and are described in https://data.isimip.org/10.48364/ISIMIP.982724. In the paper connected to this dataset (in review with Geoscientific Model Development), the newest model version, WaterGAP v2.2e is described by providing the modifications to the previous version v2.2d (Müller Schmied et al. 2021) and the corresponding changes in model output. Here, the single water storage compartments and terrestrial (total) water storage are provided.
131 27 - Research DataVollständige Liste der Indikatoren und Datenquellen für den Mobilitätswendeindex sowie Indexwerte für Darmstadt, Frankfurt a.M. und Wiesbaden2024Dieses Datenset liefert eine detaillierte Auflistung aller Indikatoren des Mobilitätswendeindex inklusive der Indikatorwerte für die erste Berechnung des Index für die Städte Frankfurt am Main, Wiesbaden und Darmstadt.
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