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 ZIH Data Compendium websites. If you need suppourt using OPARA please contact the Servicedesk of TU Dresden.
Please note: The OPARA service was recently upgraded to a new technical platform (this site). Previously stored data will not be available here immediately. It can be found at the still active old version of OPARA. These stock data will be migrated in near future and then the old version of OPARA will finally be shut down. Existing DOIs for data publications remain valid.
Communities in OPARA
Select a community to browse its collections.
Recent Submissions
Dynamic Spallation Energy Dissipation: Evaluation Methods for Split Hopkinson Bar Tests _ Dataset.rar
(Technische Universität Dresden, 2026-03-11) Davoudkhani, Milad; Maca, Petr; Krcmarova, Nela; Beckmann, Birgit; Maas, Hans-Gerd
This dataset comprises the data of the study on Dynamic Spallation Energy Dissipation: Evaluation Methods for Split Hopkinson Bar Tests. In this study, we employ a single high-speed
camera setup with photogrammetric methods. The approach is based on enhanced inverse spatial resection principles for 3D tracking from single camera image sequence data and on
Structure-from-Motion techniques for 3D shape reconstruction of multiple fragments produced in split Hopkinson bar impact experiments. These fragment shape and motion data
allow to estimate the energy of each fragment, providing a key component in the analysis of energy dissipation.
Research Data - Determination of total hemispherical emissivity utilizing an in-situ calibrated, coupled experimental-simulative electron beam calorimetric approach
(Technische Universität Bergakademie Freiberg, 2026-03-10) Kerber, Konrad
The accurate determination of the total hemispherical emission coefficient (THEC) of materials is essential for modeling radiative
heat transfer in high-temperature vacuum environments. This study presents a rapid steady-state calorimetric method to determine
the THEC using a vacuum electron beam (EB) facility. A graphite-coated Inconel 718 foil with a thickness comparable to the
electron penetration depth was used as the emission target, allowing temperature equalization within seconds. Surface temperatures
were recorded via a calibrated two-colour thermal imaging system. An in-situ calibration was conducted, using the melting point
of pure copper as a fixed reference. Numerical simulations were employed to validate both the emissivity determination and the
temperature calibration methodology. EB heating efficiency was determined at 150 keV in a combined experimental-simulative
approach using Monte Carlo simulations and backscattered electron intensity capture. Temperature calibration showed high reproducibility
with a median absolute deviation of +- 0.4% and a half range of +- 1.1% at 1085 °C, and was shown to be transferable to
other materials. EB heating efficiency slightly decreased from 0.832 +- 0.003 at room temperature to 0.825 +- 0.002 between 800 °C
to 1140 °C. THEC values between 0.88 and 0.92 with a maximum half range of +-0.06 were obtained in the range of 840 °C to
1110 °C for graphite-coated Inconel 718 with a median roughness of Ra = 1.2 µm. Reflected radiation from the emission target
and thermal losses from conduction and sublimation were assessed and found negligible. Results were consistent with literature,
particularly under high surface roughness or pre-oxidized conditions.
Test data for ICPR 2026 - RARE-Vision Competition
(Technische Universität Dresden, 2026-03-09) Le Floch, Maxime
The RARE-VISION test dataset consists of three previously unseen capsule endoscopy examinations acquired with the Navicam system at the University Hospital Carl Gustav Carus, Technical University of Dresden. The dataset is strictly separated from the development data, and ground-truth annotations are withheld for final evaluation.
Each case is provided as a complete chronological video sequence at a resolution of 480 × 480 pixels, preserving the original temporal order without trimming or manual segmentation. The three videos contain:
44,878 frames
53,220 frames
62,927 frames
The data reflect real-world clinical variability and the natural class imbalance of capsule endoscopy, where rare pathological findings occur sparsely within long sequences of normal mucosa.
Annotations are defined as temporal events (start frame, end frame, label) corresponding to the 17 competition target classes. The label set includes anatomical regions and pathological findings only; no anatomical landmarks are annotated.
The dataset is designed to evaluate robust rare-event detection, temporal consistency, and fully automatic inference on long sequential video streams.
The videos are provided exclusively for scientific research within the scope of the ICPR 2026 RARE-VISION competition and must not be used for any commercial purposes. For detailed terms of use, please refer to the official competition report and documentation.
This study was approved by the Ethics Committee of the University Hospital Carl Gustav Carus at the Technical University of Dresden on December 16, 2022 (Ethics ID: BO-EK-534122022), confirming adherence to the ethical principles of the Declaration of Helsinki. Due to the retrospective anonymization of the data and their collection during clinically indicated routine interventions, explicit consent was not required. This is additionally supported by the Ethics Committee’s approval, a consultation with the data privacy officer, and local law. Section 34, Paragraph 1 of the Saxon Hospital Act (SächsKHG) explicitly allows the collection and analysis of this type of data.
Conductive Hydrogels for Exogenous Sensing and Cell Fate Control
(Technische Universität Dresden, 2026-03-09) Akbar, Teuku Fawzul; Jimenez-Rodriguez, Carlos Alejandro; Biktimirova, Railia; Hermes, Ilka; Kurth, Thomas; Pham, My Duyen; Tsurkan, Mikhail; Friedrichs, Jens; Morgan, Francis L. C.; Kleemann, Hans; Guskova, Olga; Freudenberg, Uwe; Fratzl, Peter; Werner, Carsten; Tondera, Christoph; Minev, Ivan R.
Next generation technologies linking living systems to computers will require materials built on biology, an approach that may address persistent challenges in stable and multimodal information exchange. Here, we present a semi-synthetic hydrogel, designed to emulate key features of native extracellular matrix (ECM) while offering electrically tunable functionality. We engineer interactions between sulfated glycosaminoglycans (sGAGs) and a semiconducting organic polymer (Poly(3,4-ethylenedioxythiophene), PEDOT) within a soft hydrogel network (PEDOT:sGAGh). We demonstrate control over the material’s nanoarchitecture, electrochemical behavior, and biomolecular interactions. In particular, PEDOT:sGAGh exhibits affinity for bioactive proteins, including growth factors, and allows their release or retention to be modulated by low-voltage stimulation. This enables electrical control over macromolecular cues for cell differentiation, a capability not found in natural ECM or conventional conductive hydrogels. These functions are achieved with ultra-low PEDOT content (≈ 1 wt.%), preserving the hydrogel’s tissue-like softness and high water content. The PEDOT:sGAGh material can be integrated as a bioactive coating on electrodes, or into three dimensional organic electrochemical transistors (OECTs). Our results position PEDOT:sGAGh as a versatile platform for realizing biohybrid circuits that bridge molecular signaling and solid-state electronics, thus paving the way for brain-machine interfaces that operate beyond purely electrical modes of interaction.
Spin-liquid-like ground states in the double hydroxyperovskites CuSn(OD)6 and MnSn(OD)6 evidenced by μSR spectroscopy
(Technische Universität Dresden, 2026-02-27) Naskar, Moumita; Kulbakov, Anton A.; Parui, Kaushick K.; Krieger, Jonas A.; Hicken, Thomas J.; Luetkens, Hubertus; Häußler, Ellen; Doert, Thomas; Peets, Darren. C.; Klauss, Hans-Henning; Inosov, Dmytro S.; Sarkar, Rajib
Double hydroxide perovskites with magnetic transition-metal ions were recently identified as a unique class of materials that combine magnetic frustration with correlated proton disorder—a prerequisite for quantum-disordered fluctuating magnetic ground states resembling spin liquids. Here we present the results of muon spin relaxation (μSR) measurements carried out on fully deuterated samples of the double hydroxyperovskites CuSn(OH)6 (S = 1/2) and MnSn(OH)6 (S = 5/2) over the temperature range 0.053–50 K. The absence of any long-range magnetic order is confirmed down to 0.053 K. We observe no oscillations of the muon asymmetry down to the lowest temperature. The muon relaxation rates show a continuous increase with decreasing temperature, indicating persistent spin fluctuations in both compounds. Spin correlations are consistent with homogeneous spin dynamics. These observations reinforce the assertion that both compounds have a quantum-dynamic magnetic ground state that is consistent with a spin-liquid-like phase stabilized by proton disorder.