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.
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Recent Submissions
Reservoir computing using multimode fiber and spatial light modulator for mode decomposition - 10m MMF
(Technische Universität Dresden, 2026-10-02) Tao, Houchun
Multimode fibers (MMFs) are attractive for many applications, such as endoscopic imaging and internet data trans mission. However, modal dispersion leads to crosstalk effects. Robust mode decomposition is therefore crucial—whether to harness the inherent mode mixing for physical layer security (PLS) or to correct it in spatial division multiplexing (SDM). While traditional holographic methods can untangle this crosstalk, they require a stable reference beam, which is impractical for longhaul transmission due to environmental sensitivity. Furthermore, although recent deep-learning approaches enable reference-less decomposition, they typically suffer from high computational latency and massive training costs for dynamic channels. To overcome these limitations simultaneously, we propose a reference free, low-latency method for mode decomposition and channel reconstruction that leverages the linear complex scattering of the MMF as a passive high-dimensional spatial feature map, whose nonlinearity is provided by square-law detection at the camera. Following a reduction of the sampling rate in the frequency domain to decrease feature dimensionality, a computationally efficient linear readout layer inverts the scattering process to reconstruct the transmitted complex fields. Although the final channel reconstruction still requires digital computation steps, this readout process is limited to a single, computationally efficient linear matrix multiplication. This reduces both latency and computational overhead compared to conventional electronic neural networks, which typically exhibit high energy consumption and high latency. The physical limitations and trade-offs of this framework when scaling to higher modal complexities are also discussed. We experimentally demonstrate high-precision, reference-less mode decomposition for multiplexed classical optical fields.
GRK 2802: EFFECT OF THE INITIAL THERMAL CYCLE ON THE THERMAL DIFFUSIVITY OF AN MgO-C REFRACTORY
(Technische Universität Bergakademie Freiberg, 2026-09-30) Pan, Luyao; Wulf, Rhena; Tobias M., Fieback; Till M. J., Stadtmüller; Christos G., Aneziris
The thermal diffusivity of MgO-C refractories is strongly influenced by their composition, internal structure, and temperature. The present study demonstrates that the thermal history of the material also plays a significant role. This effect was investigated using a representative MgO-C sample measured by the laser flash method over a temperature range from room temperature to 700 °C. During the initial heating, the thermal diffusivity decreased continuously with increasing temperature, with the most pronounced decrease occurring at lower temperatures. During subsequent cooling, the thermal diffusivity increased with decreasing temperature. However, the cooling curve followed a different path from the initial heating curve and exhibited a considerably flatter temperature dependence. The observed behaviour highlights the importance of considering thermal history when interpreting temperature-dependent thermal diffusivity measurements of heterogeneous MgO-C refractory materials.
RNAseq data for Hassani et al. "Environmental enrichment regulates inter-individual transcriptional variance in the hippocampus"
(Technische Universität Dresden, 2026-09-28) Kempermann, Gerd; Rünker, Annette
Genetically identical mice housed in the same enriched environment (ENR) develop divergent behavioural trajectories associated with differences in adult hippocampal neurogenesis and brain-wide connectivity. We asked whether such inter-individual differences are also reflected in the hippocampal transcriptome—not only as shifts in mean expression, but as effects on within-group variability. Analysing bulk hippocampal RNA-seq from isogenic standard- (STD) and ENR-housed mice, we identified highly variable genes (HVGs) that segregated into common, STD-specific and ENR-specific subsets. ENR did not uniformly increase transcriptional variability: it reduced highest variability in neuron-projection and synapse genes, while maintaining or increasing it in genes linked to extracellular matrix organization and oxidative phosphorylation. Mapped onto a WGCNA-derived ENR co-expression reference, HVGs were unevenly distributed across modules and concentrated at module hubs. Hub architecture and the position of non-hub HVGs differed between modules, corresponding to distinct functional programs: synaptic and chromatin-associated in two, RNA-processing and splicing in a third. Synaptic enrichment in STD-specific HVGs, extracellular-matrix enrichment in common HVGs and module-level localisation were stable across selection thresholds (5–20%). Hippocampal transcriptional variability is thus non-random, functionally coherent, embedded in co-expression architecture and shaped by environmental experience—suggesting it is an undervalued activity-dependent variable in the regulation of brain plasticity.
GRK 2802: Thermophysical Properties of the Desulphurization Slags With Various CaS and CaO/Al2O3 Ratio
(Technische Universität Bergakademie Freiberg, 2026-09-25) Salpagarov, Eldar; Bellé, Matheus Roberto; Yehorov, Anton; Richter, Julia; Volkova, Olena
Low sulphur content is essential for high-quality steels and can be achieved by using desulphurization slag. During the desulphurization process the chemical composition of the slag changes leading to alteration in its thermophysical properties, such as surface tension, viscosity, and density. However, the influence of CaS on these thermophysical properties is poorly investigated nowadays. In this study, the influence of various CaS content (0-10 wt%) and CaO/Al2O3 ratio (1.87-1.36) on the viscosity, surface tension, and density of desulphurization slags is investigated. Measurements of surface tension and density are carried out using the maximum bubble pressure method, while viscosity is determined using the rotating bob method. The obtained results show that a decrease in viscosity value is observed with an increase in CaS content only up to 6 wt%, however, further addition of CaS sharply increases viscosity. In case of surface tension and density measurements, an increase in CaS content up to 10 wt% results in a reduction of both property values. Additionally, to study microstructure differences of the investigated slags, they were quenched and examined using Scanning electron microscopy (SEM) and Energy-dispersive X-ray spectroscopy (EDX).
GRK 2802: Anodes based on MgO-C Recyclates and 316L Steel for Prospective Aluminium Fused-Salt Electrolysis Application
(Technische Universität Bergakademie Freiberg, 2026-09-25) Gehre, Patrick; Yaroshevskyi, Serhii; Kaiser, Patricia; Brachhold, Nora; Hubálková, Jana; Aneziris, Christos
Every year, approx. 28 million tons of used refractories accumulate worldwide. The majority of them are used as aggregates for road construction (downcycling) or are deposited in landfills. For ecological and economic reasons, an increased research potential was identified in recent years, dedicated to increasing the recycling rate and finding new markets and application fields with a higher value of the refractory recyclates. The study presents the
current findings of the development of inert electrodes for the aluminum fused-salt electrolysis composed of steel and MgO gained from MgO-C recyclates. To withstand the chemical attack of molten aluminum and cryolitic melts, the metal-ceramic composites were preoxidized (PO) at 800 °C, 900 °C, and 1000 °C. The microstructure after each PO thermal treatment was analyzed. After PO at 800 °C, a (Cr,Fe)3O4 spinel-like phase and Fe-O Mg-O solid solution form. After PO at 900 °C, a larger amount of the Fe-O Mg-O solid solution and a (Cr,Fe)2O3 solid solution around the steel grains was identified. Furthermore, the electrical conductivity of the metal-ceramic-composites preoxidized at 900 °C amounts to 1.49·102 S·cm-1 and hence is in the range of carbon, which exhibits a value of 1.54·102 S·cm-1. Additionally, the impact of different preoxidation treatments at 900 °C by applying furnaces equipped
with electrical heating, natural gas burner, and microwave plasma burner on the microstructure was investigated.