@article{63984, abstract = {{This study is seeking a better understanding of polyethylene glycol (PEG) as a solvent to promote its use in chemical synthesis. The effect of adding two solutes of interest, 2,2,6,6-tetramethylpiperidinyloxyl (TEMPO) and 5-tert-butylisophthalic acid (5-TBIPA) to PEG200 (average molar weight of 200 g·mol−1) on the solution density, viscosity, and self-diffusion coefficients is monitored in a temperature range of 298.15–358.15 K to deduce how these solutes interact with the PEG200 solvent. The effect of water, the most common impurity in PEGs, is also monitored and found to be nearly negligibly small. Addition of (5-TBIPA) increases solution density and viscosity. Combined with the observation that 5-TBIPA consistently self-diffuses at about half the rate as PEG200 at all investigated experimental conditions, this suggests strong attractive solute–solvent interactions likely through hydrogen bonding interactions. In contrast, addition of TEMPO causes lower solution densities and viscosities suggesting that the solute–solvent interactions of TEMPO lead to an overall weakening of the intermolecular interactions present compared to neat PEG200. Inspection of the viscosity and self-diffusion temperature dependence reveals slight deviations from the Arrhenius equation. Interestingly, the activation energies obtained from the viscosity and the self-diffusion data are essentially identical in values suggesting that the same dynamic processes and thus the same activation barriers govern translational motion and momentum transfer in these PEG200 solutions.}}, author = {{Hoffmann, Markus M. and Randall, Nathaniel P. and Apak, Miray H. and Paddock, Nathaniel A. and Gutmann, Torsten and Buntkowsky, Gerd}}, journal = {{Journal of Solution Chemistry}}, number = {{6}}, pages = {{685–707}}, title = {{{Solute–Solvent Interactions of 2,2,6,6-Tetramethylpiperidinyloxyl and 5-Tert-Butylisophthalic Acid in Polyethylene Glycol as Observed by Measurements of Density, Viscosity, and Self-Diffusion Coefficient}}}, doi = {{10.1007/s10953-023-01265-4}}, volume = {{52}}, year = {{2023}}, } @article{63987, abstract = {{An efficient approach employing 4-dimethylaminopyridine and 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride as the coupling reagent is presented, which enables the functionalization of cotton linter paper substrates with the 19F spin label N-boc-cis-4-fluoro-l-proline. This spin label can be easily quantified by 19F magic angle spinning (MAS) NMR experiments to determine its loading on paper substrates. During the functionalization, the spin label stays intact, as confirmed by the 1H–19F heterocorrelation (1H → 19F CP MAS FSLG HETCOR) experiments. In combination with dynamic nuclear polarization (19F MAS DNP), the N-boc-cis-4-fluoro-l-proline spin label allows us to inspect 1 μmol/g and even lower molecule loadings on paper substrates, providing a highly sensitive local probe to analyze the structure of biofunctionalizations at the nanoscale on paper substrates in the future. An efficient approach employing 4-dimethylaminopyridine and 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride as the coupling reagent is presented, which enables the functionalization of cotton linter paper substrates with the 19F spin label N-boc-cis-4-fluoro-l-proline. This spin label can be easily quantified by 19F magic angle spinning (MAS) NMR experiments to determine its loading on paper substrates. During the functionalization, the spin label stays intact, as confirmed by the 1H–19F heterocorrelation (1H → 19F CP MAS FSLG HETCOR) experiments. In combination with dynamic nuclear polarization (19F MAS DNP), the N-boc-cis-4-fluoro-l-proline spin label allows us to inspect 1 μmol/g and even lower molecule loadings on paper substrates, providing a highly sensitive local probe to analyze the structure of biofunctionalizations at the nanoscale on paper substrates in the future.}}, author = {{Höfler, Mark V. and Limprasart, Waranya and Rösler, Lorenz and Fleckenstein, Max and Brodrecht, Martin and Herr, Kevin and Schäfer, Jan-Lukas and Biesalski, Markus and Breitzke, Hergen and Gutmann, Torsten}}, issn = {{1932-7447}}, journal = {{Journal of Physical Chemistry C}}, number = {{7}}, pages = {{3570–3578}}, publisher = {{American Chemical Society}}, title = {{{Fluorine-Labeled N-Boc-l-proline as a Marker for Solid-State NMR Characterization of Biofunctionalizations on Paper Substrates}}}, volume = {{127}}, year = {{2023}}, } @article{63971, abstract = {{The physicochemical effects of decorating pore walls of high surface area materials with functional groups are not sufficiently understood, despite the use of these materials in a multitude of applications such as catalysis, separations, or drug delivery. In this study, the influence of 3-amino-propyl triethoxysilane (APTES)-modified SBA-15 on the dynamics of deuterated ethylene glycol (EG-d4) is inspected by comparing three systems: EG-d4 in the bulk phase (sample 1), EG-d4 confined in SBA-15 (sample 2), and EG-d4 confined in SBA-15 modified with APTES (sample 3). The phase behavior (i.e., melting, crystallization, glass formation, etc.) of EG-d4 in these three systems is studied by differential scanning calorimetry. Through line shape analysis of the 2H solid-state NMR (2H ssNMR) spectra of the three systems recorded at different temperatures, two signal patterns, (i) a Lorentzian (liquid-like) and (ii) a Pake pattern (solid-like), are identified from which the distribution of activation energies for the dynamic processes is calculated employing a two-phase model. The physicochemical effects of decorating pore walls of high surface area materials with functional groups are not sufficiently understood, despite the use of these materials in a multitude of applications such as catalysis, separations, or drug delivery. In this study, the influence of 3-amino-propyl triethoxysilane (APTES)-modified SBA-15 on the dynamics of deuterated ethylene glycol (EG-d4) is inspected by comparing three systems: EG-d4 in the bulk phase (sample 1), EG-d4 confined in SBA-15 (sample 2), and EG-d4 confined in SBA-15 modified with APTES (sample 3). The phase behavior (i.e., melting, crystallization, glass formation, etc.) of EG-d4 in these three systems is studied by differential scanning calorimetry. Through line shape analysis of the 2H solid-state NMR (2H ssNMR) spectra of the three systems recorded at different temperatures, two signal patterns, (i) a Lorentzian (liquid-like) and (ii) a Pake pattern (solid-like), are identified from which the distribution of activation energies for the dynamic processes is calculated employing a two-phase model.}}, author = {{Haro Mares, Nadia B. and Brodrecht, Martin and Wissel, Till and Döller, Sonja C. and Rösler, Lorenz and Breitzke, Hergen and Hoffmann, Markus M. and Gutmann, Torsten and Buntkowsky, Gerd}}, issn = {{1932-7447}}, journal = {{The Journal of Physical Chemistry C}}, number = {{39}}, pages = {{19735–19746}}, publisher = {{American Chemical Society}}, title = {{{Influence of APTES-Decorated Mesoporous Silica on the Dynamics of Ethylene Glycol Molecules─Insights from Variable Temperature 2H Solid-State NMR}}}, doi = {{10.1021/acs.jpcc.3c03671}}, volume = {{127}}, year = {{2023}}, } @article{63946, abstract = {{Two different mesoporous silica materials (SBA-15 and MCM 41) were impregnated with four different, commercially available surfactants, namely, E5, PEG 200, C10E6, and Triton X-100. Differential scanning calorimetry was employed to confirm the confinement of the surfactants in the pores of their host materials. Dynamic nuclear polarization enhanced solid state 13C magic angle spinning (MAS) nuclear magnetic resonance (NMR) spectra were recorded for these materials, showing that both the direct as well as the indirect polarization transfer pathways are active for the carbons of the polyethylene glycol moieties of the surfactants. The presence of the indirect polarization pathway implies the presence of molecular motion with correlation times faster than the inverse Larmor frequency of the observed signals. The intensities of the signals were determined, and an approach based on relative intensities was employed to ensure comparability throughout the samples. From these data, the interactions of the surfactants with the pore walls could be determined. Additionally, a model describing the surfactants’ arrangement in the pores was developed. It was concluded that all carbons of the hydrophilic surfactants, E5 and PEG 200, interact with the silica walls in a similar fashion, leading to similar polarization transfer pathway patterns for all observed signals. For the amphiphilic surfactants C10E6 and Triton X-100, the terminal hydroxyl group mediates the majority of the interactions with the pore walls and the polarizing agent. Two different mesoporous silica materials (SBA-15 and MCM 41) were impregnated with four different, commercially available surfactants, namely, E5, PEG 200, C10E6, and Triton X-100. Differential scanning calorimetry was employed to confirm the confinement of the surfactants in the pores of their host materials. Dynamic nuclear polarization enhanced solid state 13C magic angle spinning (MAS) nuclear magnetic resonance (NMR) spectra were recorded for these materials, showing that both the direct as well as the indirect polarization transfer pathways are active for the carbons of the polyethylene glycol moieties of the surfactants. The presence of the indirect polarization pathway implies the presence of molecular motion with correlation times faster than the inverse Larmor frequency of the observed signals. The intensities of the signals were determined, and an approach based on relative intensities was employed to ensure comparability throughout the samples. From these data, the interactions of the surfactants with the pore walls could be determined. Additionally, a model describing the surfactants’ arrangement in the pores was developed. It was concluded that all carbons of the hydrophilic surfactants, E5 and PEG 200, interact with the silica walls in a similar fashion, leading to similar polarization transfer pathway patterns for all observed signals. For the amphiphilic surfactants C10E6 and Triton X-100, the terminal hydroxyl group mediates the majority of the interactions with the pore walls and the polarizing agent.}}, author = {{Döller, Sonja C. and Brodrecht, Martin and Gutmann, Torsten and Hoffmann, Markus and Buntkowsky, Gerd}}, issn = {{1932-7447}}, journal = {{The Journal of Physical Chemistry C}}, number = {{25}}, pages = {{12125–12134}}, publisher = {{American Chemical Society}}, title = {{{Direct and Indirect DNP NMR Uncovers the Interplay of Surfactants with Their Mesoporous Host Material}}}, doi = {{10.1021/acs.jpcc.3c01946}}, volume = {{127}}, year = {{2023}}, } @article{31190, abstract = {{For a compact Riemannian locally symmetric space $\Gamma\backslash G/K$ of arbitrary rank we determine the location of certain Ruelle-Taylor resonances for the Weyl chamber action. We provide a Weyl-lower bound on an appropriate counting function for the Ruelle-Taylor resonances and establish a spectral gap which is uniform in $\Gamma$ if $G/K$ is irreducible of higher rank. This is achieved by proving a quantum-classical correspondence, i.e. a 1:1-correspondence between horocyclically invariant Ruelle-Taylor resonant states and joint eigenfunctions of the algebra of invariant differential operators on $G/K$.}}, author = {{Hilgert, Joachim and Weich, Tobias and Wolf, Lasse Lennart}}, journal = {{Analysis & PDE}}, number = {{10}}, pages = {{2241–2265}}, publisher = {{MSP}}, title = {{{Higher rank quantum-classical correspondence}}}, doi = {{https://doi.org/10.2140/apde.2023.16.2241}}, volume = {{16}}, year = {{2023}}, } @article{31059, abstract = {{In this article we prove meromorphic continuation of weighted zeta functions in the framework of open hyperbolic systems by using the meromorphically continued restricted resolvent of Dyatlov and Guillarmou (2016). We obtain a residue formula proving equality between residues of weighted zetas and invariant Ruelle distributions. We combine this equality with results of Guillarmou, Hilgert and Weich (2021) in order to relate the residues to Patterson-Sullivan distributions. Finally we provide proof-of-principle results concerning the numerical calculation of invariant Ruelle distributions for 3-disc scattering systems.}}, author = {{Schütte, Philipp and Weich, Tobias and Barkhofen, Sonja}}, journal = {{Communications in Mathematical Physics}}, pages = {{655--678}}, title = {{{Meromorphic Continuation of Weighted Zeta Functions on Open Hyperbolic Systems}}}, doi = {{https://doi.org/10.1007/s00220-022-04538-z}}, volume = {{398}}, year = {{2023}}, } @inproceedings{53353, author = {{Biagi, Clara and Rethfeld, Louis and Kuijper, Arjan and Terhörst, Philipp}}, booktitle = {{2023 IEEE International Joint Conference on Biometrics (IJCB)}}, publisher = {{IEEE}}, title = {{{Explaining Face Recognition Through SHAP-Based Pixel-Level Face Image Quality Assessment}}}, doi = {{10.1109/ijcb57857.2023.10448905}}, year = {{2023}}, } @article{64194, author = {{Khodadoust, Javad and Monroy, Raúl and Medina-Pérez, Miguel Angel and Loyola-González, Octavio and Kusakunniran, Worapan and Boller, André and Terhörst, Philipp}}, issn = {{2667-3053}}, journal = {{Intelligent Systems with Applications}}, publisher = {{Elsevier BV}}, title = {{{A novel indexing algorithm for latent palmprints leveraging minutiae and orientation field}}}, doi = {{10.1016/j.iswa.2023.200320}}, volume = {{21}}, year = {{2023}}, } @article{63922, author = {{Asanbaeva, Nargiz B. and Dobrynin, Sergey A. and Morozov, Denis A. and Haro-Mares, Nadia and Gutmann, Torsten and Buntkowsky, Gerd and Bagryanskaya, Elena G.}}, issn = {{1420-3049}}, journal = {{Molecules}}, number = {{4}}, pages = {{1926}}, title = {{{An EPR Study on Highly Stable Nitroxyl-Nitroxyl Biradicals for Dynamic Nuclear Polarization Applications at High Magnetic Fields}}}, doi = {{10.3390/molecules28041926}}, volume = {{28}}, year = {{2023}}, } @inproceedings{52679, abstract = {{Progressive digitization throughout the entire product data life cycle requires a more sensitive handling and understanding of data within engineering processes. Regarding engineering research data, the aim is to implement the FAIR data principles (Findable, Accessible, Interoperable, Reusable) to guarantee the post-usability of research data. To ensure the quality of data throughout the entire research process a methodical approach had been developed. Based on the quality categories Intrinsic, Representative, Contextual and Available, the related quality dimensions are considered differentiated along the research data life cycle and presented in a concept. As a use case, this concept is carried out on a tensile test with documentation of results in a research data management system.}}, author = {{Müller, Laura and Wawer, Max Leo and Heimes, Norman and Uhe, Johanna and Koepler, Oliver and Auer, Sören and Lachmayer, Roland and Mozgova, Iryna}}, booktitle = {{DS 125: Proceedings of the 34th Symposium Design for X (DFX2023)}}, pages = {{143--152}}, publisher = {{Erlangen : Ehemaligennetzwerk des Lehrstuhls für Konstruktionstechnik (KTmfk) Erlangen e.V.}}, title = {{{Datenqualitätssicherung im Forschungsprozess am Beispiel von Zugversuchen}}}, doi = {{ https://doi.org/10.35199/dfx2023.15}}, year = {{2023}}, } @inproceedings{64265, author = {{Rohde, Jannik and Meyer, Olga and Duc, Quy Luu and Jürgenhake, Christoph and Sankal, Talib and Dumitrescu, Roman and Schmitt, Robert H.}}, booktitle = {{2022 Sixth IEEE International Conference on Robotic Computing (IRC)}}, publisher = {{IEEE}}, title = {{{Teleoperation of an Industrial Robot using Public Networks and 5G SA Campus Networks}}}, doi = {{10.1109/irc55401.2022.00012}}, year = {{2023}}, } @inproceedings{64261, author = {{Kurpick, Christian and Dumitrescu, Roman and Falkowski, Tommy and Fechtelpeter, Christian and Kühn, Arno}}, booktitle = {{2022 IEEE 28th International Conference on Engineering, Technology and Innovation (ICE/ITMC) & 31st International Association For Management of Technology (IAMOT) Joint Conference}}, publisher = {{IEEE}}, title = {{{Digitalization and Sustainability in Strategic Management: Research Agenda toward Dual Transformation}}}, doi = {{10.1109/ice/itmc-iamot55089.2022.10033146}}, year = {{2023}}, } @inbook{52689, author = {{Striewe, Marius and Teutenberg, Dominik and Hein, David and Meschut, Gerson and Schmelzle, Lars and Mergheim, Julia and Possart, Gunnar}}, booktitle = {{Klebtechnische Doktorandenseminare 2020 - 2022}}, isbn = {{978-3-96144-139-6}}, location = {{Blankenburg (Harz)}}, title = {{{Methode zur Simulation des temperaturabhängigen Crashverhaltens von strukturellen Klebverbindungen}}}, volume = {{369}}, year = {{2023}}, } @article{46164, author = {{Chudalla, Nick and Meschut, Gerson and Teutenberg, Dominik and Schneider, Miriam and Smart, Dominic }}, journal = {{ adhäsion KLEBEN & DICHTEN}}, number = {{6}}, title = {{{Rechnergestützte Versagensanalyse geklebter Verbindungen}}}, doi = {{https://doi.org/10.1007/s35145-023-1198-x }}, year = {{2023}}, } @inproceedings{50727, abstract = {{Die aktuellen politischen und wirtschaftlichen Rahmenbedingungen zur Reduzierung der CO2-Emissionen sowie der Trend zur flächendeckenden Elektromobilität führen zu einer Vielzahl an neuen Herausforderungen für die Auslegung zukünftiger Fahrzeugkonzepte. Eine besondere Herausforderung ist das durch die Batterie ins Fahrzeug eingebrachte Zusatzgewicht. Hierdurch ergibt sich ein Konflikt zu der bestehenden Kundenerwartung nach einer hohen Reichweite. Durch den umfangreichen Einsatz von höchstfesten Stählen in dünnen Blechdicken im Karosseriebau soll die Reduzierung des Gesamtfahrzeuggewichts vorangetrieben werden. Vor allem im stahlintensiven Leichtbau ist das Widerstandspunktschweißen aufgrund des hohen Automatisierungsgrads, der Prozesssicherheit und der damit verbundenen Wirtschaftlichkeit das dominierende Fügeverfahren. Um Begrenzungen des Bauraums der Karosserie zu begegnen und um den Materialeinsatz im Leichtbau möglichst effizient zu gestalten, werden mehrschnittige Punktschweißverbindungen eingesetzt. Hieraus ergeben sich neue Herausforderungen für die Vorhersage des Trag- und Versagensverhaltens unter Crashbelastung. Dieser Beitrag stellt eine systematische Charakterisierung von 3-Blechverbindungen zur Auffindung von formelmäßigen, empirischen Zusammenhängen zwischen der Festigkeit der Verbindung und den Einflussgrößen vor. Nach der Identifikation geeigneter Einflussgrößen, wie zum Beispiel Blechfestigkeit, Blechanordnung, Blechdickenkombination sowie Belastungsart und Lasteinleitung, auf das Trag- und Versagensverhalten, werden numerische Simulationen durchgeführt, um Ursachen für auftretende Phänomene aus den experimentellen Ergebnissen aufzuklären. Weiterhin wird untersucht, inwieweit das Verhalten von 2-Blechverbindungen auf 3-Blechverbindungen übertragbar ist. Die gefundenen Zusammenhänge sollen schnelle und kostengünstige Abschätzungen über die Festigkeit von 3-Blechbverbindungen ermöglichen. Darüber hinaus werden Ersatzmodelle für die Crashsimulation von 3-Blechverbindungen entwickelt, die recheneffizient für die Sicherheitsbewertung von großen, geschweißten Bauteilen eingesetzt werden können. Dabei sollen insbesondere die Einflüsse des Lastangriffs an jeweils einer oder beiden Fügebenen auf die Festigkeit und Energieabsorption unter verschiedenen Belastungen wie Zug, Scherung sowie Biegung abbildbar sein. }}, author = {{Olfert, Viktoria and Schuster, Lilia and Bähr, Philipp and Hein, David and Meschut, Gerson and Sommer, Silke}}, location = {{Duisburg}}, title = {{{Methodenentwicklung zur Prognose des Crashverhaltens von widerstandspunktgeschweißten 3-Stahlblechverbindungen}}}, year = {{2023}}, } @article{55535, author = {{Frantzeskakis, Rafail and Liu, Chenxu and Raissi, Zahra and Barnes, Edwin and Economou, Sophia E.}}, issn = {{2643-1564}}, journal = {{Physical Review Research}}, number = {{2}}, publisher = {{American Physical Society (APS)}}, title = {{{Extracting perfect GHZ states from imperfect weighted graph states via entanglement concentration}}}, doi = {{10.1103/physrevresearch.5.023124}}, volume = {{5}}, year = {{2023}}, } @inbook{40918, author = {{Foerster, Anne}}, booktitle = {{Eroberte im Mittelalter: Umbruchssituationen erleben, bewältigen, gestalten}}, editor = {{Bihrer, Andreas and Szill, Rike}}, pages = {{97--122}}, publisher = {{De Gruyter}}, title = {{{Die Stimmen der Eroberten bei Ermoldus Nigellus. Eine Mahnung an Ludwig den Frommen und Pippin von Aquitanien}}}, doi = {{10.1515/9783110739923-005}}, year = {{2023}}, } @article{61522, abstract = {{Linseisen, Elisa, 2020: High Definiton: Medienphilosophisches Image Processing, Lüneburg.}}, author = {{Althoff, Sebastian}}, issn = {{1869-3016}}, journal = {{ZPTh – Zeitschrift für Politische Theorie}}, number = {{1+2}}, pages = {{327--331}}, title = {{{Das ‚Zu Viel‘ digitaler Bilder}}}, doi = {{10.3224/zpth.v13i1-2.18}}, volume = {{13}}, year = {{2023}}, } @inbook{49497, author = {{Steigerwald, Jörn}}, booktitle = {{Zeiten bezeichnen. Frühneuzeitliche Epochenbegriffe: europäische Geschichte und globale Gegenwart}}, editor = {{Mahler, Andreas and Zwierlein, Cornel}}, isbn = {{978-3-447-12072-2}}, pages = {{219--233}}, publisher = {{Harrassowitz}}, title = {{{Charles Perraults 'Le Siècle de Louis le Grand' oder die Erfindung von Traditionen}}}, volume = {{177}}, year = {{2023}}, } @article{56097, abstract = {{We contrast different gradient-enhancements for plasticity-damage material models in the logarithmic strain space and compare them to reference models based on multiplicative plasticity. The models being compared include plasticity - gradient-damage, where the gradient-enhancement is applied on the local damage variable, and gradient-plasticity - damage with a gradient-enhanced plastic hardening variable. Thereby, gradient-plasticity proved to be able to simultaneously regularise plastic and ductile (plasticity-driven) damage localisation as confirmed by numerical localisation analyses. This appears to be especially advantageous for logarithmic strain space plasticity-damage, because of the observed plastic localisation even for the case of plasticity with hardening. Even though gradient-plasticity appears to be numerically more demanding, two numerical examples indicate a good robustness and mesh objectivity in the softening regime. Moreover, the internal length for plasticity is able to adjust the damage zone width, similarly to gradient-damage, however ensuring a priori that damage takes place exclusively inside the plastic zone.}}, author = {{Friedlein, Johannes and Mergheim, Julia and Steinmann, Paul}}, issn = {{0997-7538}}, journal = {{European Journal of Mechanics - A/Solids}}, keywords = {{Finite plasticity, Logarithmic strain space, Ductile damage, Gradient-enhancement, Gradient-plasticity, Gradient-damage, Loss of ellipticity}}, publisher = {{Elsevier BV}}, title = {{{Efficient gradient enhancements for plasticity with ductile damage in the logarithmic strain space}}}, doi = {{10.1016/j.euromechsol.2023.104946}}, volume = {{99}}, year = {{2023}}, }