Technische Universität Dresden

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Research data repository of Dresden University of Technology.

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Browsing Technische Universität Dresden by Title

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    Open Access
    Amplification of Negative Gas Adsorption in a multivariate framework
    (Technische Universität Dresden, 2024-06-20) Bon, Volodymyr
    The approach of multivariate MOFs was used to fine-tune the mechanical properties of the flexible framework DUT-49. In situ XRD, NMR and physisorption studies showed that the partial incorporation of a more rigid linker into DUT-49 framework enables a stabilization of the metastable open pore phase which led to a twofold amplification of the expelled gas amount upon “Negative Gas Adsorption” transition.
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    Open Access
    Bistable Organic Electrochemical Transistors: Enthalpy vs. Entropy
    (Technische Universität Dresden, 2024-07-03) Bongartz, Lukas
    Organic electrochemical transistors (OECTs) serve as the foundation for a wide range of emerging applications, from bioelectronic implants and smart sensor systems to neuromorphic computing. Their ascent originates from a distinctive switching mechanism based on the coupling of electronic and ionic charge carriers, which gives rise to a multitude of unique characteristics. Notably, various OECT systems have been reported with significant hysteresis in their transfer curve. While being a feature sought after as non-volatile memory in neuromorphic systems, no universal explanation has yet been given for its physical origin, impeding its advanced implementation. Herein, we present a thermodynamic framework that readily elucidates the emergence of bistable OECT operation through the interplay of enthalpy and entropy. We validate our model through three experimental approaches, covering temperature-resolved characterizations, targeted material manipulation, and thermal imaging. In this context, we demonstrate the exceptional scenario where the subthreshold swing deviates from Boltzmann statistics, and we provide an alternate view on existing data in literature, which further supports our model. Finally, we leverage the bistability in form of a single-OECT Schmitt trigger, thus compacting the complexity of a multi-component circuit into a single device. These insights offer a revised understanding of OECT physics and promote their application in non-conventional computing, where symmetry-breaking phenomena are pivotal to unlock novel paradigms.
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    Open Access
    Correlation Clustering of Organoid Images: Data
    (Technische Universität Dresden, 2024-08-23) Presberger, Jannik; Keshara, Rashmiparvathi; Stein, David; Kim, Yung Hae; Grapin-Botton, Anne; Andres, Bjoern
    The data considered in: J. Presberger, R. Keshara, D. Stein, Y. H. Kim, A. Grapin-Botton and B. Andres. Correlation Clustering of Organoid Images. In: GCPR 2024.
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    Open Access
    Data for "Ferrimagnetism from triple-q order in Na2Co2TeO6"
    (Technische Universität Dresden, 2024-11-14) Francini, Niccolò; Janssen, Lukas
    The archive contains the data used to construct Fig. 3, Fig. 4, and Fig. 5(a) of the paper "Ferrimagnetism from triple-q order in Na2Co2TeO6" by N. Francini and L. Janssen [arXiv:2409.12234]. The work uses classical Monte-Carlo simulations to study the ferrimagnetic response of two different extended Kitaev-Heisenberg models realizing two different ground states: a collinear zigzag state and a noncollinear triple-q state.
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    Open Access
    Data for Stability of Bogoliubov Fermi surfaces within BCS theory
    (Technische Universität Dresden, 2024-11-06) Bhattacharya, Ankita; Timm, Carsten
    This archive contains the data plotted in the paper A. Bhattacharya and C. Timm, Stability of Bogoliubov Fermi surfaces within BCS theory, Phys. Rev. B 107, L220501 (2023) and its Supplemental Material. For this paper, the superconducting gap and the energy gain in the superconducting state relative to the normal state were obtained by solving the inverse BCS gap equation. The required integrals over the Brillouin zone were performed using global-adaptive integrations with high precision in Mathematica.
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    Open Access
    Data of an online-survey about the barriers in the implementation of evidence based teaching concepts at german universities in physics
    (Technische Universität Dresden, 2024-10-02) Kaltofen, Tim; Prestel, Thomas
    Data contains anonymous answers to a set of questions about knowledge and use of evidece based teaching concepts by german lectueres in lectures and tutorials. The data includes assessments of the obstacles to implement these teaching concepts. Additionally, possible support offerings were inquired about. Demographic data is listed at the end of the survey.
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    Open Access
    Data set of the energy demand and associated movement of automated storage and retrieval machines
    (Technische Universität Dresden, 2024-06-24) Siegel, Armin
    The database consists of measurement data from multiple pallet racking storage and retrieval machines (SRMs) and the devices from automatic small parts storage systems (ASPS). The power consumption and the distance traveled by the systems were measured during several measurement operations. There are isolated measurements for the travel and hoist mechanisms of the systems. For power measurement, the Hioki 3193 Power HiTester was used. To capture the distance to the computer, a Dimetix laser distance sensor, model FLS-C 10, was employed. To account for all components and their losses, the power was measured at the aisle connection point. Accordingly, all components of the SRMs, including their losses, were recorded. The measurement setup and detailed methodology are described in the dissertation "Minimierung der Netzanschlussleistung und des Energiebedarfs von Regalbediengerät-Lagersystemen" / "Minimization of grid connection power and energy demand in automated storage and retrieval systems" by Armin Siegel. In addition to the database, which is provided as a compressed SQL file, example queries in Matlab (R2017b) and Python 3 are included.
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    Open Access
    Data STM NBD
    (Technische Universität Dresden, 2024-07-15) Moresco, Francesca
    Supplementary raw STM data to the publication "Direct imaging of a norbornadiene (NBD) derivative adsorbed on the Au(111) surface"
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    Open Access
    Data STM rotor and car
    (Technische Universität Dresden, 2024-09-11) Moresco, Francesca
    Supplementary raw STM data to the publication "A Nanocar and Rotor in One Molecule" https://doi.org/10.48550/arXiv.2305.06791
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    Open Access
    Data Underpinning: Coupled frustrated ferromagnetic and antiferromagnetic quantum spin chains in the quasi-one-dimensional mineral antlerite Cu₃⁢SO₄(OH)₄
    (Technische Universität Dresden, 2024-11-06) Kulbakov, Anton A.; Kononenko, Denys Y.; Nishimoto, Satoshi; Stahl, Quirin; Mannathanath Chakkingal, Aswathi; Feig, Manuel; Gumeniuk, Roman; Skourski, Yurii; Bhaskaran, Lakshmi; Zvyagin, Sergei A.; Embs, Jan Peter; Puente-Orench, Inés; Wildes, Andrew; Geck, Jochen; Janson, Oleg; Inosov, Dmytro S.; Peets, Darren C.
    Abstract of the published article: Magnetic frustration, the competition among exchange interactions, often leads to novel magnetic ground states with unique physical properties which can hinge on details of interactions that are otherwise difficult to observe. Such states are particularly interesting when it is possible to tune the balance among the interactions to access multiple types of magnetic order. We present antlerite Cu₃⁢SO₄⁢(OH)₄ as a potential platform for tuning frustration. Contrary to previous reports, the low-temperature magnetic state of its three-leg zigzag ladders is a quasi-one-dimensional analog of the magnetic state recently proposed to exhibit spinon-magnon mixing in botallackite. Density functional theory calculations indicate that antlerite's magnetic ground state is exquisitely sensitive to fine details of the atomic positions, with each chain independently on the cusp of a phase transition, indicating an excellent potential for tunability.
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    Open Access
    Data Underpinning: Magnetic phase diagram of rouaite, Cu₂⁢(OH)₃⁢NO₃
    (Technische Universität Dresden, 2024-11-04) Peets, Darren Campbell; Mannathanath Chakkingal, Aswathi; Kulbakov, Anton A.; Grumbach, Justus; Pavlovskii, Nikolai S.; Stockert, Ulrike; Parui, Kaushick Krishnakanta; Avdeev, Maxim; Kumar, Ramender; Niwata, Issei; Häußler, Ellen; Gumeniuk, Roman; Stewart, J. Ross; Tellam, James P.; Pomjakushin, Vladimir; Granovsky, Sergey; Doerr, Mathias; Hassinger, Elena; Zherlitsyn, Sergei; Ihara, Yoshihiko; Inosov, Dmytro S.
    This contains the data underpinning our recent paper on rouaite, Cu₂⁢(OH)₃⁢NO₃, published in Phys. Rev. B 110, 054442 (2024). The abstract of the article is reproduced below: Spinon-magnon mixing was recently reported in botallackite Cu2⁢(OH)3⁢Br with a uniaxially compressed triangular lattice of Cu2+ quantum spins [H. Zhang et al., Phys. Rev. Lett. 125, 037204 (2020)]. Its nitrate counterpart rouaite, Cu2⁢(OH)3⁢NO3, has a highly analogous structure and might be expected to exhibit similar physics. To lay a foundation for research on this material, we clarify rouaite's magnetic phase diagram and identify both low-field phases. The low-temperature magnetic state consists of alternating ferromagnetic and antiferromagnetic chains, as in botallackite, but with additional canting, leading to net moments on all chains which rotate from one chain to another to form a 90∘ cycloidal pattern. The higher-temperature phase is a helical modulation of this order, wherein the spins rotate from one Cu plane to the next. This extends to zero temperature for fields perpendicular to the chains, leading to a set of low-temperature field-induced phase transitions. Rouaite may offer another platform for spinon-magnon mixing, while our results suggest a delicate balance of interactions and high tunability of the magnetism.
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    Open Access
    Data: Neural networks meet anisotropic hyperelasticity: A framework based on generalized structure tensors and isotropic tensor functions
    (Technische Universität Dresden, 2024-11-21) Kalina, Karl Alexander; Brummund, Jörg; Sun, WaiChing; Kästner, Markus
    This collection provides homogenized datasets including deformation gradient, free energy, stress tensor and material tangent for anisotropic hyperelastic composites. Five different representative volume elements (RVEs) are included: An RVE of a fiber reinforced material with stochastic fiber distribution (stochastic fibers), a unit cell with a hexagonal fiber arrangement (hexagonal fibers), a unit cell with one spherical inclusion (cubic sphere), an RVE with a plane-like arrangement of particles (plane spheres), and an RVE with an arrangement of particles in a chain-like structure (chain spheres). All components, i.e., matrix, particles and fibers are assumed to be compressible and isotropic. For all, a two-parametric neo-Hookean model was chosen. The data have been generated by using an in-house finite element code based on Matlab. The data belongs to the work "Neural networks meet anisotropic hyperelasticity: A framework based on generalized structure tensors and isotropic tensor functions" by Kalina et al.; https://doi.org/10.48550/arXiv.2410.03378. Further information on the data can be found there.
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    Datasets for paper "ReACKed QUICer: Measuring the Performance of Instant Acknowledgments in QUIC Handshakes"
    (Technische Universität Dresden, 2024-10-28) Mücke, Jonas; Nawrocki, Marcin; Hiesgen, Raphael; Schmidt, Thomas C.; Wählisch, Matthias
    This dataset contains Qlog and packet captures to measure the Performance of Instant Acknowledgements in (i) an emulated testbed and (ii) CDNs. See https://doi.org/10.5281/zenodo.13743301 Abstract: In this paper, we present a detailed performance analysis of QUIC instant ACK, a standard-compliant approach to reduce waiting times during the QUIC connection setup in common CDN deployments. To understand the root causes of the performance properties, we combine numerical analysis and the emulation of eight QUIC implementations using the QUIC Interop Runner. Our experiments comprehensively cover packet loss and non-loss scenarios, different round trip times, and TLS certificate sizes. To clarify instant ACK deployments in the wild, we conduct active measurements of 1M popular domain names. For almost all domain names under control of Cloudflare, Cloudflare uses instant ACK, which in fact improves performance. We also find, however, that instant ACK may lead to unnecessary retransmissions or longer waiting times under some network conditions, raising awareness of drawbacks of instant ACK in the future.
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    Open Access
    Datensatz zur Überarbeitung der SAP UCC Fallstudie "Materialwirtschaft"
    (Technische Universität Dresden, 2024-06-04) Rogas, Anja; Ott, Marko
    Der Datensatz umfasst Daten, welche im Rahmen der Übung "Materialwirtschaft" zur Lehrveranstaltung Grundlagen betrieblicher Anwendungssysteme in den im WiSe 22/23, SoSe 23, WiSe 23/24 und SoSe 24 erhoben worden sind. Folgende Daten wurden hierfür erfasst: - bildungsbiografische Daten - Big Five Inventory (BFI-10) - Skalen zur Erfassung der Lern- und Leistungsmotivation (SELLMO) - Fragebogen zur Erfassung aktueller Motivation (FAM) - Cognitive Load Scale - Wissenstest im Pre-Posttest-Design - SAP UCC GBI Fallstudienmonitor
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    Open Access
    Diffusion data of vertical partitioning of CO2 production in a forest soil
    (Technische Universität Dresden, 2024-10-29) Wordell-Dietrich, Patrick
    This dataset serves as a supplement to the 2020 publication (https://doi.org/10.5194/bg-17-6341-2020), providing detailed data for the determination of diffusion coefficients in core cylinders. Included are measurement results of bulk density and diffusivity as a function of the water content within the cylinders as well as the pF relation.
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    Open Access
    Dual testing field for studies of environmental and operational effects in structural damage localization of mechanical structures
    (Technische Universität Dresden, 2024-07-09) Rohrer, Maximilian
    This dataset accompanies the research on the impact of Environmental and Operational Conditions (EOC) on vibration-based Structural Health Monitoring (SHM) methods. It includes comprehensive acceleration data collected from a novel experimental testing field consisting of two identical mechanical structures. One structure operates in a controllable laboratory environment, while the other is subjected to real-world EOC in a field setup. The dataset captures mass along with various environmental factors affecting the field setup. This modular measurement system ensures the collection of high-quality data, making this dataset a valuable benchmark for researchers studying the effects of EOC on SHM. The dataset provides a unique opportunity for validating and developing robust SHM techniques that can adapt to varying EOC, fostering advancements in the field.
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    Open Access
    Exciton diffusion in two-dimensional chiral perovskites
    (Technische Universität Dresden, 2024-11-07) Terres, Sophia; Scalon, Lucas; Brunner, Julius; Horneber, Dominik; Düreth, Johannes; Huang, Shiyu; Taniguchi, Takashi; Watanabe, Kenji; Nogueira, Ana Flávia; Höfling, Sven; Klembt, Sebastian; Vaynzof, Yana; Chernikov, Alexey
    This contains the data underpinning our recent paper on chiral 2D perovskites, uploaded on ArXiv (https://doi.org/10.48550/arXiv.2408.05946) in 2024. The abstract of the article is reproduced below: Two-dimensional (2D) organic-inorganic hybrid perovskites emerged as a versatile platform for light-emitting and photovoltaic applications due to their unique structural design and chemical flexibility. Their properties depend heavily on both the choice of the inorganic lead halide framework and the surrounding organic layers. Recently, the introduction of chiral cations into 2D perovskites has attracted major interest due to their potential for introducing chirality and tuning the chiro-optical response. Importantly, the optical properties in these materials are dominated by tightly bound excitons that also serve as primary carriers for the energy transport. The mobility of photoinjected excitons is thus important from the perspectives of fundamental material properties and optoelectronic applications, yet remains an open question. Here, we demonstrate exciton propagation in a 2D chiral perovskite methylbenzylammonium lead iodide (MBA2PbI4) using transient photoluminescence microscopy and reveal density-dependent transport over more than 100 nanometers at room temperature with diffusion coefficients as high as 2 cm2/s. We observe two distinct regimes of initially rapid diffusive propagation and subsequent localization. Moreover, perovskites with enantiomer pure cations are found to exhibit faster exciton diffusion compared to the race-mic mixture, correlated with the impact of the material composition on disorder. Altogether, the observations of efficient exciton diffusion at room temperature highlight the potential of 2D chiral perovskites to merge chiro-optical properties with strong light-matter interaction and efficient energy transport.
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    Open Access
    Extended Phase-Field Method (XPFM) - Data corresponding to publication: "An enriched phase-field method for the efficient simulation of fracture processes" by Loehnert et al. (2023)
    (Technische Universität Dresden, 2024-04-22) Curosu, Verena
    This dataset contains the numerical values corresponding to the graphs within the scientific (open-access) contribution "An enriched phase-field method for the efficient simulation of fracture processes" by Loehnert et al. (2023) (https://doi.org/10.1007/s00466-023-02285-z). Abstract of Paper: The efficient simulation of complex fracture processes is still a challenging task. In this contribution, an enriched phase-field method for the simulation of 2D fracture processes is presented. It has the potential to drastically reduce computational cost compared to the classical phase-field method (PFM). The method is based on the combination of a phase-field approach with an ansatz transformation for the simulation of fracture processes and an enrichment technique for the displacement field as it is used in the extended finite element method (XFEM) or generalised finite element method (GFEM). This combination allows for the application of significantly coarser meshes than it is possible in PFM while still obtaining accurate solutions. In contrast to classical XFEM / GFEM, the presented method does not require level set techniques or explicit representations of crack geometries, considerably simplifying the simulation of crack initiation, propagation, and coalescence. The efficiency and accuracy of this new method is shown in 2D simulations.
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    Open Access
    Longitudinal Concrete Analysis Data
    (Technische Universität Dresden, 2024-10-28) Duran Vergara, Laura Camila; Leicht, Lena; Beckmann, Birgit; Maas, Hans-Gerd
    The "Longitudinal Concrete Analysis" dataset contains ultrahigh-speed image sequences of concrete surface cylinders under compression testing in a split Hopkinson pressure bar (SHPB) setup, captured with a Kirana7M camera at frame rates between 1 million and 2 million frames per second (Mfps). A Bézier fitting filtering method has been applied to the raw images to correct for inherent image lag errors of the Kirana7M, enabling proper material analysis based using one-dimensional wave theory. The primary use of this dataset is to estimate the longitudinal wave propagation velocity during the first stress wave transit, achieved through the development of an image-sequence-based approach for selecting stress-wave-induced motion points. Additionally, the dataset is used for the estimation of various material properties, including global deformation, concrete velocity, strain, and stress. Strain measurements obtained through the well-established strain gauge technique—commonly used in split Hopkinson bar testing for material analysis—are also provided within the dataset, for validation of the ultrahigh-speed image sequence analysis.
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    Open Access
    Lorentz transmission electron microscopy and Hall effect data of Mn1.4PtSn
    (Technische Universität Dresden, 2024-09-21) Thomas, Andy; Pohl, Darius
    The extended dataset of our corresponding publications: 1) Images_Field_Sweep: Lorentz TEM images of the field sweep 2) Images_Sample_Tilt: Lorentz TEM images of the tilt series 3) MnPtSn_Pos7_Loop_0_500_-500_0mT_25uA_2sec.ma7: ASCII data magnetotransport of the field sweep in (1) 4) MnPtSn_Pos7_AS_Tilt_-7_Start_delta_50uA.ma7: ASCII data magnetotransport of the tilt series in (2) 5) Video_Field_Sweep.avi: Lower resolution video of all images in (1) 6) Video_Sample_Tilt.avi: Lower resolution video of all images in (2)