Helmholtz Institute Freiberg for Resource Technology
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1328 research outputs found
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Test data for MALA
No full textThis repository contains data to test, develop and debug MALA and MALA based runscripts. If you plan to do machine-learning tests ("Does this network implementation work? Is this new data loading strategy working?"), this is the right data to test with. It is NOT production level data
Connecting Metadata, Data, and Software Repositories in a Generic Data Management Lifecycle
Get PDFThe connection between metadata, data, and software and the integration in an overall lifecycle is crucial for effective data management in research. The generic data management lifecycle, developed at HZDR, bridges these critical components, ensuring seamless data discovery, accessibility, and reproducibility. The approach emphasises the planning of experiments, the role of metadata, data storage, as well as software versioning, and the final publication of digital research artefacts, which enables comprehensive traceability from data creation to long-term archiving. By aligning these elements in a unified procedure, we recommend a uniform lifecycle that can be adapted to different research areas, with a particular focus on community services, such as SciCat, that improves data integrity and promote collaborative research
HZDR Software Policy
No full textSoftware is a central component of academic research and the scientific infrastructure and is devel-oped and used in all HZDR institutes. In this regulation, software refers to all forms of program code (e.g. source code together with associated documentation) and executable programs generated from it, which are developed, made available and passed on within the scope of activities at the HZDR. The development of software is an integral part of modern publication contexts consisting of written publica-tions, data sets and software.
The policy covers the software life cycle, from software development and documentation to the transfer and maintenance of the software. The regulation is intended to support the establishment of modern software engineering methods at the HZDR, which enable high standards in software de-velopment, software quality and management. This professionalization will achieve greater sustain-ability and promote good scientific practice in terms of the verifiability and reproducibility of research results
Data publication: Separated electronic and strain interfaces in core/dual-shell nanowires: unlocking the potential of strained GaAs for applications across near-infrared
No full textThis dataset is raw streak camera images for nanowire, PL spectra, python code for fitting
FVV1455: CFD Simulation of Droplet Separators
No full textFor industrial applications, the two-fluid model is preferred due to its efficient modelling of small-scale interfaces. Whereas, a thin film model, based on a long wave approximation, is used for the unresolved interfaces to obtain the film features by solving the 2D Navier-Stokes equations for wall films. Within the project, the target is to develop an experimentally validated 3D-CFD model to investigate the separation efficiency of droplet separators for fuel cell systems. A hybrid model is developed, which couples the two-fluid model with a thin film model via mass transfer terms for droplet deposition, droplet entrainment and film separation. A two-way coupling between droplets and the thin film is established using mass and momentum source terms, derived analytical and from available experiments. The droplet separator is an essential component of an automotive fuel cell system that segregates a significant amount of liquid fractions from the air-water mixture. The flow dynamics inside a droplet separator consist of a dispersed gas and liquid with a wall adhered thin liquid film. The modelling is divided into the following stages due to the complex fluidic phenomenon inside a generic droplet separator:
Droplet deposition model,
Film separation model,
Film transition model, and
Population balance model.
The numerical simulations are validated and fine-tuned with experiments carried out at HZDR.The research project was self-financed (FVV funding no. 1455) by the FVV e.V
Direct evidence for ligand-enhanced activity of Cu(I) sites
No full textThe dataset consists of Infrared photodissociation (IRPD) spectra of Cu+(H2O)(H2)n (with n ≤ 3) and its isotopologue measured on the Leipzig 5 K ring-electrode ion-trap triple mass spectrometer. Besides, it contains the Energy Decomposition Analysis (EDA), the benchmark results, the harmonic and the anharmonic VPT2 frequencies results as well as the script used to get the predicted separation factor for the adsorbed dihydrogen isotopologue. HoFe₆Al
Differential pressure measurements in bubble columns of different diameter, operated with various physical systems
No full textThe dataset was acquired over several measurement campaigns and contains differential pressure measurements in bubble columns of several diameters (100, 150, 330 mm) operated with gas in continuum (dry air) and liquid in batch. The fact that no humidification was provided was shown to have negligible influence. Liquid temperature was between 20-22°C. Pressure was atmospheric (column open to the environment).
For additional details, refer to the READ_ME and DETAILS_Setup files included in the dataset
FVV1455: CFD Simulation of Droplet Separators
No full textFor industrial applications, the two-fluid model is preferred due to its efficient modelling of small-scale interfaces. Whereas, a thin film model, based on a long wave approximation, is used for the unresolved interfaces to obtain the film features by solving the 2D Navier-Stokes equations for wall films. Within the project, the target is to develop an experimentally validated 3D-CFD model to investigate the separation efficiency of droplet separators for fuel cell systems. A hybrid model is developed, which couples the two-fluid model with a thin film model via mass transfer terms for droplet deposition, droplet entrainment and film separation. A two-way coupling between droplets and the thin film is established using mass and momentum source terms, derived analytical and from available experiments. The droplet separator is an essential component of an automotive fuel cell system that segregates a significant amount of liquid fractions from the air-water mixture. The flow dynamics inside a droplet separator consist of a dispersed gas and liquid with a wall adhered thin liquid film. The modelling is divided into the following stages due to the complex fluidic phenomenon inside a generic droplet separator:
Droplet deposition model,
Film separation model,
Film transition model, and
Population balance model.
The numerical simulations are validated and fine-tuned with experiments carried out at HZDR.The research project was self-financed (FVV funding no. 1455) by the FVV e.V
Data publication: Strong transient magnetic fields induced by THz-driven plasmons in graphene disks
No full textIn the zip file all metadata and raw data of experiements and simulations are collected and sorted into different folder
Data: A Spectral and Spatial Comparison of Satellite-Based Hyperspectral Data for Geological Mapping
No full textThe new generation of satellite hyperspectral (HS) sensors provides remarkable potential for regional-scale mineralogical mapping. However, as with any satellite sensor, mapping results are dependent on a typically complex correction procedure needed to remove atmospheric, topographic and geometric distortions before accurate reflectance spectra can be retrieved. These are typically applied by the satellite operators but use different approaches that can yield different results. In this study, we conduct a comparative analysis of PRISMA, EnMAP, and EMIT hyperspectral satellite data, alongside airborne data acquired by the HyMap sensor, to investigate the consistency between these datasets and their suitability for geological mapping. Two sites in Namibia were selected for this comparison, the Marinkas-Quellen and Epembe carbonatite complexes, based on their geological significance, relatively good exposure, arid climate and data availability. We conducted qualitative and three different quantitative comparisons of the hyperspectral data from these sites. These included correlative comparisons of (1) the reflectance values across the visible-near infrared (VNIR) to shortwave infrared (SWIR) spectral ranges, (2) established spectral indices sensitive to minerals we expect in each of the scenes, and (3) spectral abundances estimated using linear unmixing. The results highlighted a notable shift in inter-sensor consistency between the VNIR and SWIR spectral ranges, with the VNIR range being more similar between the compared sensors than the SWIR. Our qualitative comparisons suggest that the SWIR spectra from the EnMAP and EMIT sensors are the most interpretable (show the most distinct absorption features) but that latent features (i.e., endmember abundances) from the HyMap and PRISMA sensors are consistent with geological variations. We conclude that our results reinforce the need for accurate radiometric and topographic corrections, especially for the SWIR range most commonly used for geological mapping