@article{63960, abstract = {{Recent advances in solid-state nuclear magnetic resonance (NMR) spectroscopy and dynamic nuclear polarization (DNP) of nanostructured materials are reviewed. A first group of materials is based on crystalline nanocellulose (CNC) or microcrystalline cellulose (MCC), which are used as carrier materials for dye molecules, catalysts or in combination with heterocyclic molecules as ion conducting membranes. These materials have widespread applications in sensorics, optics, catalysis or fuel cell research. A second group are metal oxides such as V-Mo-W oxides, which are of enormous importance in the manufacturing process of basic chemicals. The third group are catalytically active nanocrystalline metal nanoparticles, coated with protectants or embedded in polymers. The last group includes of lead-free perovskite materials, which are employed as environmentally benign substitution materials for conventional lead-based electronics materials. These materials are discussed in terms of their application and physico-chemical characterization by solid-state NMR techniques, combined with gas-phase NMR and quantum-chemical modelling on the density functional theory (DFT) level. The application of multinuclear 1H, 2H, 13C, 15N and 23Na solid state NMR techniques under static or MAS conditions for the characterization of these materials, their surfaces and processes on their surfaces is discussed. Moreover, the analytic power of the combination of these techniques with DNP for the identification of low-concentrated carbon and nitrogen containing surface species in natural abundance is reviewed. Finally, approaches for sensitivity enhancement by DNP of quadrupolar nuclei such as 17O and 51V are presented that enable the identification of catalytic sites in metal oxide catalysts.}}, author = {{Gutmann, Torsten and Groszewicz, Pedro B. and Buntkowsky, Gerd}}, journal = {{Annual Reports on NMR Spectroscopy}}, keywords = {{solid-state nmr, heterogeneous catalysis, dynamic nuclear polarization, Ferroelectrics, Nanocatalysis, Surface reactions}}, pages = {{1–82}}, title = {{{Solid-state NMR of nanocrystals}}}, doi = {{10.1016/bs.arnmr.2018.12.001}}, volume = {{97}}, year = {{2019}}, } @article{63930, abstract = {{Abstract Specific spin labeling allows the site-selective investigation of biomolecules by EPR and DNP enhanced NMR spectroscopy. A novel spin labeling strategy for commercially available Fmoc-amino acids is developed. In this approach, the PROXYL spin label is covalently attached to the hydroxyl side chain of three amino acids hydroxyproline (Hyp), serine (Ser) and tyrosine (Tyr) by a simple three-step synthesis route. The obtained PROXYL containing building-blocks are N-terminally protected by the Fmoc-protection group, which makes them applicable for the use in solid-phase peptide synthesis (SPPS). This approach allows the insertion of the spin label at any desired position during SPPS, which makes it more versatile than the widely used post synthetic spin labeling strategies. For the final building-blocks, the radical activity is proven by EPR. DNP enhanced solid-state NMR experiments employing these building-blocks in a TCE solution show enhancement factors of up to 26 for 1H and 13C (1H→13C cross-polarization). To proof the viability of the presented building-blocks for insertion of the spin label during SPPS the penta-peptide Acetyl-Gly-Ser(PROXYL)-Gly-Gly-Gly was synthesized employing the spin labeled Ser building-block. This peptide could successfully be isolated and the spin label activity proved by EPR and DNP NMR measurements, showing enhancement factors of 12.1±0.1 for 1H and 13.9±0.5 for 13C (direct polarization).}}, author = {{Brodrecht, Martin and Herr, Kevin and Bothe, Sarah and de Oliveira Jr., Marcos and Gutmann, Torsten and Buntkowsky, Gerd}}, journal = {{ChemPhysChem}}, number = {{11}}, pages = {{1475–1487}}, title = {{{Efficient Building Blocks for Solid-Phase Peptide Synthesis of Spin Labeled Peptides for Electron Paramagnetic Resonance and Dynamic Nuclear Polarization Applications}}}, doi = {{10.1002/cphc.201900211}}, volume = {{20}}, year = {{2019}}, } @article{63931, abstract = {{Abstract The structure and surface functionalization of biologically relevant silica-based hybrid materials was investigated by 2D solid-state NMR techniques combined with dynamic nuclear polarization (DNP). This approach was applied to a model system of mesoporous silica, which was modified through in-pore grafting of small peptides by solid-phase peptide synthesis (SPPS). To prove the covalent binding of the peptides on the surface, DNP-enhanced solid-state NMR was used for the detection of 15N NMR signals in natural abundance. DNP-enhanced heterocorrelation experiments with frequency switched Lee–Goldburg homonuclear proton decoupling (1H–13C and 1H–15N CP MAS FSLG HETCOR) were performed to verify the primary structure and configuration of the synthesized peptides. 1H FSLG spectra and 1H-29Si FSLG HETCOR correlation spectra were recorded to investigate the orientation of the amino acid residues with respect to the silica surface. The combination of these NMR techniques provides detailed insights into the structure of amino acid functionalized hybrid compounds and allows for the understanding for each synthesis step during the in-pore SPPS.}}, author = {{Brodrecht, Martin and Kumari, Bharti and Thankamony, A. S. Sofia Lilly and Breitzke, Hergen and Gutmann, Torsten and Buntkowsky, Gerd}}, journal = {{Chemistry A European Journal}}, number = {{20}}, pages = {{5214–5221}}, title = {{{Structural Insights into Peptides Bound to the Surface of Silica Nanopores}}}, doi = {{10.1002/chem.201805480}}, volume = {{25}}, year = {{2019}}, } @article{64280, author = {{van den Ban, Erik P. and Kuit, Job J. and Schlichtkrull, Henrik}}, issn = {{2156-2261}}, journal = {{Kyoto Journal of Mathematics}}, number = {{2}}, publisher = {{Duke University Press}}, title = {{{The notion of cusp forms for a class of reductive symmetric spaces of split rank 1}}}, doi = {{10.1215/21562261-2019-0015}}, volume = {{59}}, year = {{2019}}, } @article{15739, author = {{Azadi, Sam and Kühne, Thomas D.}}, issn = {{2469-9950}}, journal = {{Physical Review B}}, number = {{15}}, pages = {{155103--155109}}, title = {{{Unconventional phase III of high-pressure solid hydrogen}}}, doi = {{10.1103/physrevb.100.155103}}, volume = {{100}}, year = {{2019}}, } @article{32741, author = {{Markewitz, Friedrich}}, journal = {{Zeitschrift für Literaturwissenschaft und Literatur (LiLi)}}, number = {{2}}, pages = {{321--344}}, title = {{{Grundlagen und Paradigmen einer systemtheoretisch fundierten Textsortenlinguistik – Eine kritische Bestandsaufnahme}}}, year = {{2019}}, } @inbook{36868, abstract = {{Die nachfolgenden Überlegungen sind aus unserem Forschungszusammenhang entstanden, der als „Nachwuchsforscherinnengruppe: Die Kinderladenbewegung. Biographische Auswirkungen und gesellschaftspolitische Einflüsse institutioneller Erziehungsarrangements“ am 1. Januar 2011 an der Westfälischen Wilhelms-Universität Münster im Arbeitsbereich Sozialpädagogik startete und von Januar 2013 bis Ende 2017 an der Technischen Universität Dresden im Institut für Sozialpädagogik, Sozialarbeit und Wohlfahrtswissenschaften angesiedelt war. Finanziell und inhaltlich wurden wir durch die Hans-Böckler-Stiftung mit drei Stipendien und einer finanziellen Grundausstattung gefördert.}}, author = {{Bock, Karin and Göddertz, Nina and Heyden, Franziska and Mauritz, Miriam}}, booktitle = {{Zugänge zur Kinderladenbewegung.}}, editor = {{Bock, Karin and Göddertz, Nina and Heyden, Franziska and Mauritz, Miriam}}, isbn = {{978-3-658-24188-9}}, keywords = {{Pädagogik, Erziehungswissenschaft, Kinderladenbewegung}}, pages = {{389--429}}, publisher = {{Springer VS}}, title = {{{Statt eines Nachworts: Die Kinderladenbewegung als Forschungsthema einer „Nachwuchsforscherinnengruppe“}}}, doi = {{10.1007/978-3-658-24189-6_23}}, year = {{2019}}, } @inbook{59887, author = {{Plaksin, Anna Viktoria Katrin and Olley, Jacob}}, booktitle = {{Music Encoding Conference Proceedings 2015, 2016 and 2017}}, editor = {{Di Bacco, Giuliano and Kepper, Johannes and Roland, Perry D.}}, location = {{Tours}}, pages = {{119--130}}, title = {{{Creating an Encoding Workflow for a Critical Edition of Ottoman Music Manuscripts: Challenges and Solutions}}}, doi = {{10.15463/MUSIC-1}}, year = {{2019}}, } @inproceedings{59781, author = {{Petrov, Dmitry and Meyers, Thorsten and Reker, Julia and Hilleringmann, Ulrich}}, booktitle = {{Fifth Conference on Sensors, MEMS, and Electro-Optic Systems}}, editor = {{du Plessis, Monuko}}, publisher = {{SPIE}}, title = {{{Doctor blade system for the deposition of thin semiconducting films}}}, doi = {{10.1117/12.2501307}}, year = {{2019}}, } @inproceedings{39943, author = {{Schmidt, Marco and Petrov, Dmitry and Hedayat, Christian and Hilleringmann, Ulrich and Otto, Thomas}}, booktitle = {{Smart Systems Integration; 13th International Conference and Exhibition on Integration Issues of Miniaturized Systems}}, pages = {{1--4}}, title = {{{Wireless power supply for a RFID based sensor platform}}}, year = {{2019}}, } @inproceedings{39944, author = {{Petrov, Dmitry and Schmidt, Marco and Hilleringmann, Ulrich and Hedayat, Christian and Otto, Thomas}}, booktitle = {{Smart Systems Integration; 13th International Conference and Exhibition on Integration Issues of Miniaturized Systems}}, pages = {{1--4}}, title = {{{RFID based sensor platform for industry 4.0 application}}}, year = {{2019}}, } @inproceedings{64361, author = {{Neutsch, Krisztian and Hofmann, Martin R. and Gerhardt, Nils Christopher and Schnitzler, Lena and Tranelis, Marlon J.}}, booktitle = {{Practical Holography XXXIII: Displays, Materials, and Applications}}, title = {{{Three-dimensional particle localization with common-path digital holographic microscopy}}}, doi = {{10.1117/12.2509448}}, year = {{2019}}, } @inbook{64360, author = {{Gerhardt, Nils Christopher and Žutić, Igor and Lee, Jeongsu and Gøthgen, Christian and Farla, Paulo E., Junior and Xu, Gaofeng and Sipahi, Guilherme M.}}, booktitle = {{Nanoscale spintronics and applications}}, pages = {{499 -- 540}}, title = {{{Semiconductor spin-lasers}}}, year = {{2019}}, } @article{59687, abstract = {{Lasers have both ubiquitous applications and roles as model systems in which non-equilibrium and cooperative phenomena can be elucidated1. The introduction of novel concepts in laser operation thus has potential to lead to both new applications and fundamental insights2. Spintronics3, in which both the spin and the charge of the electron are used, has led to the development of spin-lasers, in which charge-carrier spin and photon spin are exploited. Here we show experimentally that the coupling between carrier spin and light polarization in common semiconductor lasers can enable room-temperature modulation frequencies above 200 gigahertz, exceeding by nearly an order of magnitude the best conventional semiconductor lasers. Surprisingly, this ultrafast operation of the resultant spin-laser relies on a short carrier spin relaxation time and a large anisotropy of the refractive index, both of which are commonly viewed as detrimental in spintronics3 and conventional lasers4. Our results overcome the key speed limitations of conventional directly modulated lasers and offer a prospect for the next generation of low-energy ultrafast optical communication.}}, author = {{Lindemann, Markus and Xu, Gaofeng and Pusch, Tobias and Michalzik, Rainer and Hofmann, Martin R. and Žutić, Igor and Gerhardt, Nils Christopher}}, issn = {{0028-0836}}, journal = {{Nature}}, number = {{7751}}, pages = {{212--215}}, publisher = {{Springer Science and Business Media LLC}}, title = {{{Ultrafast spin-lasers}}}, doi = {{10.1038/s41586-019-1073-y}}, volume = {{568}}, year = {{2019}}, } @unpublished{64769, author = {{Nikitin, Natalie}}, title = {{{Measurable regularity of infinite-dimensional Lie groups based on Lusin measurability}}}, year = {{2019}}, } @article{64756, author = {{Walter, Boris}}, issn = {{0019-3577}}, journal = {{Indagationes Mathematicae}}, keywords = {{58D05, 57S05, 22E65, 58D15, 58B10}}, number = {{4}}, pages = {{669–705}}, title = {{{Weighted diffeomorphism groups of Riemannian manifolds}}}, doi = {{10.1016/j.indag.2019.03.003}}, volume = {{30}}, year = {{2019}}, } @article{64630, author = {{Glöckner, Helge}}, issn = {{0008-414X}}, journal = {{Canadian Journal of Mathematics}}, keywords = {{22E65, 22A05, 22E67, 46A13, 46M40, 58D05}}, number = {{1}}, pages = {{131–152}}, title = {{{Completeness of infinite-dimensional Lie groups in their left uniformity}}}, doi = {{10.4153/CJM-2017-048-5}}, volume = {{71}}, year = {{2019}}, } @article{64780, abstract = {{The increasing trend of multi-material and space-frame design in automotive car body constructions consolidates the need for mechanical joining technologies with one-sided accessibility. The high-speed joining process (also called “RIVTAC®” or “Impact”) is an innovative and flexible technology. In this process, a tack having a profiled shank and an ogival shaped tip is pushed into the joining partners with a speed of 20 to 40 m/s without any pre-punching. The plastic and friction work is converted into heat, which causes an abrupt rise of temperature in the joining zone. This improves the flowability of the material which leads to filling the annular grooves existing on the shank of the tack. Simultaneously, a force-fit is created between the sheet metal and the tack. Furthermore, the effects of inertia are used so that the thin-walled structures can be joined without any additional tools (e.g. a die). The joining process causes the deformation of the structure, which must be taken into account with regard to tolerances. The numerical simulation is a powerful tool to predict the deformation and the joinability of a complex structure as well as the mechanical properties of the connection. The paper is about the detailed process- and load-simulation of high-speed joining as well as the required experimental data basis, such as temperature and strain rate dependent flow curves. Furthermore, the friction parameters are very important for the physical consideration of the force-fit connection. Coupled structural-thermal simulations of an axisymmetric 2D-model are performed using explicit and implicit codes.}}, author = {{Meschut, Gerson and Hein, David and Gerkens, Michael}}, issn = {{2351-9789}}, journal = {{Procedia Manufacturing}}, pages = {{280--287}}, publisher = {{Elsevier BV}}, title = {{{Numerical simulation of high-speed joining of sheet metal structures}}}, doi = {{10.1016/j.promfg.2019.02.173}}, volume = {{29}}, year = {{2019}}, } @article{64779, author = {{Ditter, Jan and Meschut, Gerson and Wibbeke, Tim Michael}}, issn = {{1619-1919}}, journal = {{adhäsion KLEBEN & DICHTEN}}, number = {{6}}, pages = {{18--25}}, publisher = {{Springer Science and Business Media LLC}}, title = {{{Entfüge- und Fügekonzepte für geklebte Leichtbaustrukturen}}}, doi = {{10.1007/s35145-019-0038-5}}, volume = {{63}}, year = {{2019}}, } @article{19747, author = {{Ditter, Jan and Meschut, Gerson and Wibbeke, Tim Michael}}, journal = {{Adhäsion Kleben&Dichten}}, number = {{6}}, pages = {{18--24}}, title = {{{Disjoining and joining concepts for adhesive-bonded lightweight structures}}}, doi = {{10.1007/s35145-019-0038-5}}, year = {{2019}}, }