Research Data Repository of Saxon Universities
OPARA is the Open Access Repository and Archive for Research Data of Saxon Universities.
Researchers of Saxon Universities can either publish their research data on OPARA, or archive it here to comply with requirements of funding acencies and good scientic practice, without public access.
You can find the documentation of this service at the OPARA manual websites. If you need suppourt using OPARA please contact the Servicedesk of TU Dresden.
Communities in OPARA
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Recent Submissions
FOR 3010: Thermal Expansion and Phase Transformation up to 1200 °C of Metastable Aluminas Produced by Flame Spraying
(Technische Universität Bergakademie Freiberg, 2026-10-27) Zienert, Tilo; Aneziris, Christos G.
The transition aluminas δ1 and the cubic, non-spinel-type η-Al2O3 were detected in addition to α-Al2O3 in flame-sprayed material. Their transitions from room temperature up to 1200 °C were investigated by high-temperature XRD measurements. Structural changes with time and temperature were observed for all transition aluminas (η-, δ1- and θ-Al2O3). The phases followed the expected transition sequence of η→δ1→θ→α and showed mainly linear, temperature-independent transition rates. Based on the determined thermal expansion of the phases, it is proposed that the metastable transitions are at least partly mechanically induced. In addition, a second-order phase transition from η→θ might be indicated around 1050–1075 °C by the determined trends of density.
Thermal Expansion of Electrofused MgO-Based Spinel Systems Containing Fe2O3, Al2O3-Fe2O3, Al2O3-Cr2O3-Fe2O3 and Al2O3-NiO-Fe2O3
(Technische Universität Bergakademie Freiberg, 2026-10-27) Zienert, Tilo; Borges, Otavio H.; Pandolfelli, Victor C.; Aneziris, Christos C.
Magnesia-spinel multicomponent materials have been used as refractories for a long time. In addition to a few binary systems, the influence of spinel phases on the thermal expansion (α) of MgO or the resulting compound has not been studied so far. As α is critical for refractories in application, this work investigates the thermal expansion of complex MgO-based spinel systems using X-ray diffraction (XRD) in combination with Rietveld refinement in the temperature range between 30 °C and 1200 °C. All studied periclase solid solutions, in contact with spinels of the systems Mg1.01(Al0.23Cr1.64Fe0.13)O4, Fe3O4–MgFe2O4, NiFe2O4–NiAl2O4, MgAl2O4–MgFe2O4, Fe3O4–FeAl2O4 and Fe3O4 · NiFe2O4 ·2 MgAl2O4 showed α trends below plain MgO, or even decreasing values above 1000 °C. Many spinels showed large negative thermal expansion coefficients. It was found that the structural change in spinels is constrained, leading to a common analytical expression to calculate the lattice parameter of spinels with temperature, which was used to study the nature of the investigated spinels in more detail. The work highlights that Cr-free MgO-spinel systems show similar or even better high-temperature behaviour than commonly used magnesia–chrome aggregates.
Quellcode und Datenmodell der Forschungsdatenbank Schwingfestigkeitsversuche für Wellen und Welle-Nabe-Verbindungen
(Technische Universität Dresden, 2026-10-23) Becker, Nils
Der vorliegende Datensatz beinhaltet den Quellcode der Datenbankanwendung (Quellcode.zip), das zugehörige Datenmodell in unterschiedlichen Formaten und ein Backup der Datenbank mit vorliegenden Daten aus mehreren Forschungsprojekten zum Stand Februar 2026. Der Quellcode kann zum Aufsetzen der Datenbankanwendung genutzt werden, anschließend kann das Backup der Datenbank bei Bedarf eingespielt werden.
An Annotated Multi-Platform Laser Scanning Dataset (MLS, ULS, TLS) for Semantic Segmentation of Point Clouds in Complex Forest Environments
(Technische Universität Dresden, 2026-10-20) Matzke, Felix Rocco; Eltner, Anette
Available datasets for semantic segmentation of forest point clouds mostly contain data from a single sensing system. This dataset provides LiDAR point clouds of a forest scene in the Richterschlüchte area, Saxon Switzerland, Germany, acquired during a field campaign in March 2023 using three different laser scanning systems: mobile laser scanning (MLS), uncrewed aerial vehicle laser scanning (ULS), and terrestrial laser scanning (TLS). All point clouds were manually annotated with three semantic classes, namely trunk, ground, and miscellaneous. In total, five point clouds are included: the MLS point cloud is partitioned into training, validation, and test subsets, while the TLS and ULS point clouds are provided to assess generalization across varying sensing systems. The dataset is intended for developing and testing deep learning approaches for the semantic segmentation of point clouds in complex forest environments.
Research data for stakeholders and their strategic interaction in Germany’s energy transition
(Technische Universität Bergakademie Freiberg, 2026-10-20) Li, Anqi; Brumme, Anja; Rübbelke, Dirk
This dataset provides the materials underlying the systematic literature review and cross-impact balance (CIB) analysis of stakeholder interactions in Germany’s energy transition. It includes the literature search strategies, the list and descriptive analysis of the 95 included studies, the study coding and strategy state descriptions, the CIB matrix with scoring rationales and supporting references, and the ScenarioWizard model file.