DaKS - University of Kassel's research data repository

DaKS is the institutional repository of the University of Kassel for research data. It offers structured storage of research data alongside with descriptive metadata, long-term archiving for at least 10 years and – if requested – the publication of the dataset with a DOI.

DaKS is managed by the university library and the IT Service Centre of the University of Kassel. It is hosted at Philipps-Universität Marburg. We are happy to advise you via daks@uni-kassel.de.

Recent Submissions

Micromagnetic measurement of the surface layer state in hard turned 51CrV4 steel
(Universität Kassel) Wittich, Felix; Wegener, Thomas; Liehr, Alexander; Zinn, Wolfgang; Niendorf, Thomas; Kroll, Andreas; Bolender, Artjom; Degener, Sebastian
Description of the dataset:

This data set contains measurement data from a micromagentic sensor that allows for non-destructive, in-process material characterization of the mechanical properties of ferromagnetic components. It contains 82 features that were measured using a MM sensor as input variables and corresponding reference measurements of the residual stress and hardness as outputs.

The parts that were measured are from hard turning experiments of quenched and tempered (Q&T) steel 51CrV4 in different initial surface hardness levels, i. e. 400 HV30, 500 HV30 and 600 HV30. For details on the manufacturing process, please refer to https://doi.org/10.48662/daks-69.

The MM measurements were carried out using a 3MA-II device from Fraunhofer IZFP. The sensor utilizes four measurement methods: Barkhausen noise, incremental permeability, multi-frequency Eddy current analysis and harmonic analysis of the tangential magnetic field strength, resulting in 41 features that are extracted from the measurement curves. The data set includes 81 data points with 82 input variables. By using two different magnetization amplitudes, 82 input variables are available.

As output variables the surface hardness is available and two characteristic values for the near surface residual stress state: the residual stress on the surface, i.e. at depth 0 micrometer and the maximum compressive residual stress. These values where extracted from the residual stress depth profiles. The residual stress was measured with X-ray diffraction, using a Pulstec μ-X360 diffractometer. Post process Vickers hardness testing was carried out using a Struers DuraScan-70 system.

The supplied .csv contains 82 columns with features from the MM measurements and 3 columns with the reference measurements: ES1 (surface residual stress), ES2 (maximum compressive residual stress) and HV (surface hardness). The Readme.txt contains further details about the data set.

For more details on the sensor and the experimental setup, please refer to [1].

[1] Thomas Wegener, Alexander Liehr, Artjom Bolender, Sebastian Degener, Felix Wittich, Andreas Kroll & Thomas Niendorf, "Calibration and validation of micromagnetic data for non-destructive analysis of near-surface properties after hard turning" in HTM Journal of Heat Treatment and Materials, 2022, 77(2), 156-172.
Simulationsmodell gesamtwirtschaftliche Kosten und Nutzen der energetischen Modernisierungen des deutschen Mietwohngebäudebestandes
(Universität Kassel) Reutter, Leo; Winiewska, Bernadetta; Lindauer, Manuel; Schmidt, Wolfgang; Sprengard, Christoph
Das Simulationsmodell wurde im Rahmen des Verbundprojektes FLAMME (Fairness, Lastenverteilung und Akzeptanz des Mietrechts bei Modernisierungen für Energieeffizienz) entwickelt. Am Verbundprojekt beteiligt waren die Universität Kassel, das ITG Dresden, das FIW München und das Umweltbundesamt (UBA). Simulationsmodell hauptsächlich erstellt von: Leo Reutter. Beigetragen haben auch Dr. Manuel Lindauer (FIW München), Wolfgang Schmidt (FIW München), Christoph Sprengard (FIW München), Dr. Bernadetta Winiewska (ITG Dresden). Das Simulationsmodell ermöglicht es, für vorgegebene Beispielgebäude und Modernisierungsoptionen, die proportional auf den gesamten deutschen Mietwohngebäudebestand verteilt werden, abhängig von mietrechtlichen und förderpolitischen Rahmenbedingungen und unter Beachtung knapper Handwerkskapazitäten zu berechnen, wann in den Jahren 2023 bis 2045 energetische Modernisierungen aus Vermieterinnen-Perspektive im Vergleich zur reinen Instandhaltung lohnen und durchgeführt werden können und welche Auswirkungen auf Mieter zu erwarten sind. Es ermöglicht so die vergleichende Analyse verschiedener mietrechtlicher Umlagesysteme darauf hin, wie viel staatliche Förderung bei den untersuchten Umlagesystemen notwendig ist, um bestimmte politische Ziele, insbesondere Klimaschutzziele, zu erreichen. Das Simulationsmodell baut auf auf dem Simulationsmodell von Reutter, Winiewska, et al. (2025) und dem dazugehörigen Aufsatz Reutter und Winiewska (2025).
Anhang - Dissertation Lineare Versorgungstrassen. Konstruktionszeichnungen, methodische Grundlage, gebäudetechnische Auslegungen sowie Daten-Grundlagen zu Ökologie/Ökonomie
(Universität Kassel) Witteborg, Norman
Dies ist der gesamte Anhang der Dissertation „Lineare Versorgungstrassen. Entwicklung eines neuen besonders flexiblen Systems zur Integration der Gebäudetechnik in Bürogebäude mit dem Ziel einer nachhaltigeren Nutzung“. Neben einer Übersicht der einzelnen Anhänge A bis I mit Planübersichten und Variantenanalysen der betrachteten gebäudetechnischen Gewerke (Lüftungs-, Heizungs-, Kühlungs-, und Elektrotechnik) umfasst der gesamte Datensatz unter anderem Konstruktionszeichnungen, Pläne zur Entwicklung der Methodik, gebäudetechnische Auslegungen, Datenblätter bereits bestehender Referenzsysteme sowie Daten-Grundlagen zur Erstellung von Ökobilanzen und zur Bewertung ökonomischer Aspekte.
Monte-Carlo simulation of the three dimensional transfer function for coherence scanning interferometry [Code/Data]
(Universität Kassel) Künne, Marco; Rosenthal, Felix; Lehmann, Peter
The provided code is meant to simulate the 3D transfer function of a coherence scanning interferometer (CSI), which is a new approach to describe the transfer behavior of optical systems containing a depth scan. The software code is a python script which calculates the 3D optical transfer function by using a Monte-Carlo method applying reversed sampling. The related mathematical details and can be found in the related publication. The system which is simulated by the code is set to a numerical aperture of 0.9 and considers only monochromatic illumination of 440 nm. The .h5 dataset contains the raw data from the CSI measurement shown as a comparison. A silicon mirror was used as an measurement object, while the CSI used in this case is a Linnik setup. The provided code imports this dataset, plots an interferogram from one pixel and calculates its spectrum as a comparison to the histograms computed by the statistical Monte-Carlo simulation. The .npz files contain the analytically calculated transfer functions, based on the universal fourier optics model. The file "TF_ps.npz" is for the monochromatic case of royal blue illumination, while the file "TF_ps_spec_rb.npz" considers an full width of half maximum (FWHM) of 20 nm of the illuminating royal blue LED as presented in the paper. Running the simulation code should work without adjustments other than the paths of the datasets which have to be imported. Make sure plots of datasets that are not provided or necessary are commented out.
Motion of water-immersed superparamagnetic microparticles on top of a topographically flat thin film substrate imprinted with engineered magnetic stripe domains of gradually increasing/decreasing stripe width and alternating head-to-head/tail-to-tail magnetization configuration
(Universität Kassel) Huhnstock, Rico; Ehresmann, Arno
The controlled transport and fractionation of magnetic microparticles according to their structural and magnetic properties is of great importance for the realization of miniaturized Lab-on-a-chip devices, applicable, e.g., for medical point-of-care diagnostics. We designed a transport and pre-sorting system for superparamagnetic beads based on an engineered magnetic stray field landscape emerging from a magnetic stripe domain pattern inside an exchange-biased thin film system. The magnetic stripe domains were imprinted into the system via ion bombardment induced magnetic patterning. The pattern consists of stripe domains with gradually increasing and decreasing stripe width, periodically repeated across the whole substrate. Directed motion of superparamagnetic beads above the substrate inside a quiescent liquid (water) is induced by applying weak external magnetic field pulses, superposing the static magnetic stray field landscape. The beads are forced to perform a jumping motion with increasing/decreasing jump length owing to the arrangement of the underlying domain pattern. Our data shows a simultaneous fractionation of all particles into mobile and immobile units according to their magnetophoretic mobilities. The motion velocity of the particles is thereby a function of jump length (stripe domain width) and the magnitude of the external field pulses. Superparamagnetic beads of significantly different sizes can be spatially separated using a short sequence of constant field pulses.

Videos of the particle motion were recorded using high-speed cameras attached to an optical microscope. The water-dispersed particles were placed on top of the magnetically patterned substrate inside a microfluidic chamber and motion was initiated by applying periodically repeated magnetic field pulses (pulse lengths in the ms-range; pulse magnitudes in the mT-range) using orthogonally arranged Helmholtz coils. The videos were analyzed qualitatively and quantitatively (particle velocity) using a custom Python code.