@article{39653, abstract = {{AbstractA detailed investigation of the energy levels of perylene-3,4,9,10-tetracarboxylic tetraethylester as a representative compound for the whole family of perylene esters was performed. It was revealed via electrochemical measurements that one oxidation and two reductions take place. The bandgaps determined via the electrochemical approach are in good agreement with the optical bandgap obtained from the absorption spectra via a Tauc plot. In addition, absorption spectra in dependence of the electrochemical potential were the basis for extensive quantum-chemical calculations of the neutral, monoanionic, and dianionic molecules. For this purpose, calculations based on density functional theory were compared with post-Hartree–Fock methods and the CAM-B3LYP functional proved to be the most reliable choice for the calculation of absorption spectra. Furthermore, spectral features found experimentally could be reproduced with vibronic calculations and allowed to understand their origins. In particular, the two lowest energy absorption bands of the anion are not caused by absorption of two distinct electronic states, which might have been expected from vertical excitation calculations, but both states exhibit a strong vibronic progression resulting in contributions to both bands.}}, author = {{Wiebeler, Christian and Vollbrecht, Joachim and Neuba, Adam and Kitzerow, Heinz-Siegfried and Schumacher, Stefan}}, issn = {{2045-2322}}, journal = {{Scientific Reports}}, keywords = {{Multidisciplinary}}, number = {{1}}, publisher = {{Springer Science and Business Media LLC}}, title = {{{Unraveling the electrochemical and spectroscopic properties of neutral and negatively charged perylene tetraethylesters}}}, doi = {{10.1038/s41598-021-95551-0}}, volume = {{11}}, year = {{2021}}, } @article{40434, author = {{Klement, Philip and Dehnhardt, Natalie and Dong, Chuan-Ding and Dobener, Florian and Bayliff, Samuel and Winkler, Julius and Hofmann, Detlev M. and Klar, Peter J. and Schumacher, Stefan and Chatterjee, Sangam and Heine, Johanna}}, issn = {{0935-9648}}, journal = {{Advanced Materials}}, keywords = {{Mechanical Engineering, Mechanics of Materials, General Materials Science}}, number = {{23}}, publisher = {{Wiley}}, title = {{{Atomically Thin Sheets of Lead‐Free 1D Hybrid Perovskites Feature Tunable White‐Light Emission from Self‐Trapped Excitons}}}, doi = {{10.1002/adma.202100518}}, volume = {{33}}, year = {{2021}}, } @article{21359, author = {{Barkhausen, Franziska and Pukrop, Matthias and Schumacher, Stefan and Ma, Xuekai}}, issn = {{2469-9950}}, journal = {{Physical Review B}}, number = {{7}}, title = {{{Structuring coflowing and counterflowing currents of polariton condensates in concentric ring-shaped and elliptical potentials}}}, doi = {{10.1103/physrevb.103.075305}}, volume = {{103}}, year = {{2021}}, } @article{24975, author = {{Franz, Martin and Chandola, Sandhya and Koy, Maximilian and Zielinski, Robert and Aldahhak, Hazem and Das, Mowpriya and Freitag, Matthias and Gerstmann, Uwe and Liebig, Denise and Hoffmann, Adrian Karl and Rosin, Maximilian and Schmidt, Wolf Gero and Hogan, Conor and Glorius, Frank and Esser, Norbert and Dähne, Mario}}, issn = {{1755-4330}}, journal = {{Nature Chemistry}}, pages = {{828--835}}, title = {{{Controlled growth of ordered monolayers of N-heterocyclic carbenes on silicon}}}, doi = {{10.1038/s41557-021-00721-2}}, year = {{2021}}, } @article{23418, abstract = {{Density-functional theory within a Berry-phase formulation of the dynamical polarization is used to determine the second-order susceptibility χ(2) of lithium niobate (LiNbO3). Defect trapped polarons and bipolarons are found to strongly enhance the nonlinear susceptibility of the material, in particular if localized at NbV–VLi defect pairs. This is essentially a consequence of the polaronic excitation resulting in relaxation-induced gap states. The occupation of these levels leads to strongly enhanced χ(2) coefficients and allows for the spatial and transient modification of the second-harmonic generation of macroscopic samples.}}, author = {{Kozub, Agnieszka L. and Schindlmayr, Arno and Gerstmann, Uwe and Schmidt, Wolf Gero}}, issn = {{2469-9969}}, journal = {{Physical Review B}}, pages = {{174110}}, publisher = {{American Physical Society}}, title = {{{Polaronic enhancement of second-harmonic generation in lithium niobate}}}, doi = {{10.1103/PhysRevB.104.174110}}, volume = {{104}}, year = {{2021}}, } @inproceedings{23475, author = {{Rose, Hendrik and Paul, Jagannath and Wahlstrand, Jared K. and Bristow, Alan D. and Meier, Torsten}}, booktitle = {{Ultrafast Phenomena and Nanophotonics XXV}}, editor = {{Betz, Markus and Elezzabi, Abdulhakem Y.}}, title = {{{Theoretical analysis and simulations of two-dimensional Fourier transform spectroscopy performed on exciton-polaritons of a quantum-well microcavity system}}}, doi = {{10.1117/12.2576696}}, volume = {{11684}}, year = {{2021}}, } @article{37333, author = {{Krauss-Kodytek, L. and Hannes, W.-R. and Meier, Torsten and Ruppert, C. and Betz, M.}}, issn = {{2469-9950}}, journal = {{Physical Review B}}, number = {{8}}, publisher = {{American Physical Society (APS)}}, title = {{{Nondegenerate two-photon absorption in ZnSe: Experiment and theory}}}, doi = {{10.1103/physrevb.104.085201}}, volume = {{104}}, year = {{2021}}, } @article{21547, author = {{Riabinin, Matvei and Sharapova, Polina and Bartley, Tim and Meier, Torsten}}, issn = {{2399-6528}}, journal = {{Journal of Physics Communications}}, number = {{4}}, title = {{{Generating two-mode squeezing with multimode measurement-induced nonlinearity}}}, doi = {{10.1088/2399-6528/abeec2}}, volume = {{5}}, year = {{2021}}, } @article{23472, author = {{Krauss-Kodytek, L. and Hannes, Wolf-Rüdiger and Meier, Torsten and Ruppert, C. and Betz, M.}}, issn = {{2469-9950}}, journal = {{Physical Review B}}, number = {{8}}, title = {{{Nondegenerate two-photon absorption in ZnSe: Experiment and theory}}}, doi = {{10.1103/physrevb.104.085201}}, volume = {{104}}, year = {{2021}}, } @inproceedings{26390, author = {{Moritzer, Elmar and Flachmann, Felix}}, booktitle = {{PPS-36 Proceedings}}, location = {{Montreal}}, title = {{{Process-reliable Injection Molding of Highly Filled Wood-Plastic-Composites (WPC)}}}, year = {{2021}}, } @article{44200, author = {{Teichert, Jeannine}}, journal = {{Networking Knowledge}}, number = {{1}}, pages = {{51--66}}, title = {{{Mediating close friendship intimacy in times of (social) distance}}}, doi = {{https://doi.org/10.31165/nk.2021.141.648}}, volume = {{14}}, year = {{2021}}, } @article{22265, author = {{Grabo, Matti and Acar, Emre and Kenig, Eugeny}}, issn = {{0960-1481}}, journal = {{Renewable Energy}}, pages = {{1087--1097}}, title = {{{Modeling and improvement of a packed bed latent heat storage filled with non-spherical encapsulated PCM-Elements}}}, doi = {{10.1016/j.renene.2021.04.022}}, volume = {{173}}, year = {{2021}}, } @inproceedings{21477, author = {{Rostek, Tim and Makeieva, Hanna and Homberg, Werner}}, booktitle = {{Proceedings of the 13th International Conference on the Technology of Plasticity}}, editor = {{Daehn, G. and Cao, J. and Kinsey, B. and Tekkaya, A. E. and Vivek, A. and Yoshida, Y}}, isbn = {{978-3-030-75380-1}}, location = {{Columbus}}, pages = {{2115--2125}}, publisher = {{Springer, Cham}}, title = {{{Cutting Blades for Food Processing Applications Manufactured Using Innovative Spin Forming}}}, doi = {{10.1007/978-3-030-75381-8_178}}, year = {{2021}}, } @article{22798, abstract = {{The predictive quality of numerical simulations for mechanical joining processes depends on the implemented material model, especially regarding the plasticity of the joining parts. Therefore, experimental material characterization processes are conducted to determine the material properties of sheet metal and generate flow curves. In this regard, there are a number of procedures which are accompanied by varying experimental efforts. This paper presents various methods of determining flow curves for HCT590X as well as EN AW-6014, including varying specimen geometries and diverse hardening laws for extrapolation procedures. The flow curves thus generated are compared considering the variety of plastic strains occurring in mechanical joining processes. The material data generated are implemented in simulation models for the joining technologies, clinching and self-piercing riveting. The influence of the varied methods on the predictive accuracy of the simulation model is analysed. The evaluation of the differing flow curves is achieved by comparing the geometric formation of the joints and the required joining forces of the processes with experimentally investigated joints.}}, author = {{Böhnke, Max and Kappe, Fabian and Bobbert, Mathias and Meschut, Gerson}}, issn = {{2195-8572}}, journal = {{Materials Testing}}, number = {{6}}, pages = {{493--500}}, publisher = {{De Gruyter}}, title = {{{Influence of various procedures for the determination of flow curves on the predictive accuracy of numerical simulations for mechanical joining processes}}}, doi = {{10.1515/mt-2020-0082}}, volume = {{63}}, year = {{2021}}, } @article{34226, abstract = {{The increasing use of multi-material constructions lead to a continuous increase in the use of mechanical joining techniques due to the wide range of joining possibilities as well as the high load-bearing capacities of the joints. Nevertheless, the currently rigid tool systems are not able to react to changing boundary conditions, like changing the material-geometry-combination. Therefore research work is crucial with regard to versatile joining systems. In this paper, a new approach for a versatile self-piercing riveting process considering the joining system as well as the auxiliary joining part is presented.}}, author = {{Kappe, Fabian and Bobbert, Mathias and Meschut, Gerson}}, issn = {{1662-9795}}, journal = {{Key Engineering Materials}}, keywords = {{Mechanical Engineering, Mechanics of Materials, General Materials Science}}, pages = {{3--10}}, publisher = {{Trans Tech Publications, Ltd.}}, title = {{{New Approach for Versatile Self Piercing Riveting: Joining System and Auxiliary Part}}}, doi = {{10.4028/www.scientific.net/kem.883.3}}, volume = {{883}}, year = {{2021}}, } @article{30200, author = {{Wituschek, Simon and Kappe, Fabian and Lechner, Michael}}, journal = {{Production Engineering}}, title = {{{Investigation of the influence of varying tumbling strategies on a tumbling self-piercing riveting process}}}, doi = {{10.1007/s11740-021-01099-3}}, year = {{2021}}, } @inbook{22766, author = {{Dahms, Frederik and Homberg, Werner}}, booktitle = {{Forming the Future}}, issn = {{2367-1181}}, location = {{Ohio, USA, VIRTUAL EVENT}}, pages = {{2249--2259}}, publisher = {{Springer, Cham}}, title = {{{Investigations and Improvements in 3D-DIC Optical Residual Stress Analysis—A New Temperature Compensation Method}}}, doi = {{10.1007/978-3-030-75381-8_189}}, year = {{2021}}, } @article{20921, abstract = {{The increase of the thermal conductivity of PUR foam in the insulation of the cabinet is an important cause for aging processes of household refrigerating appliances. To determine the influence of the PUR foam aging on energy consumption, the development of a new measurement method is necessary be- cause current methods influence the aging behavior of household refrigerators and are therefore not applicable in general. Based on a latent heat sink, constructed as an ice water bucket, a new measure- ment method is developed to determine the k ·A value over time. With this method, the k ·A value of four household refrigerating appliances was determined over an interval of 14 months. The k ·A value increased between 3.6% and 11.5% during this period.}}, author = {{Paul, Andreas and Baumhögger, Elmar and Elsner, Andreas and Moczarski, Lukas and Reineke, Michael and Sonnenrein, Gerrit and Hueppe, Christian and Stamminger, Rainer and Hoelscher, Heike and Wagner, Hendrik and Gries, Ulrich and Freiberger, Alfred and Becker, Wolfgang and Vrabec, Jadran}}, issn = {{0140-7007}}, journal = {{International Journal of Refrigeration}}, pages = {{235--242}}, title = {{{Determining the heat flow through the cabinet walls of household refrigerating appliances}}}, doi = {{10.1016/j.ijrefrig.2020.10.007}}, year = {{2021}}, } @article{27290, abstract = {{Domestic refrigeration appliances are standard household commodities. Although policies, such as the energy labelling, prompted technical improvements and decreased appliance energy consumption throughout recent decades, important parameters were disregarded. These refer to the efficiency loss over time and the consumer behaviour. The objective of this contribution was to develop a dynamic energy model to determine the power consumption of refrigeration appliances considering degradation factors and behaviour. These were included by model parameters for direct consumer interactions, such as the storage behaviour, door openings and temperature setting, as well as indirect actions, e.g. exposing an appliance to specific temperature conditions at an installation site. For this, an online-survey was conducted to evaluate the consumer behaviour. A total of 706 consumers participated in the national questionnaire, serving as input for the dynamic energy model. It was found that the efficiency loss increases the power consumption by at least 1% annually, leading to an excess of 10% after 10 years of usage. Another important finding was that 32.5% of appliance’s power consumption results from consumer behaviour, whereas the promotion of behavioural changes leads to a significant decrease of the consumer-induced consumption. Consequently, this study provides a tool to evaluate the impact of policies targeting refrigeration appliances, stressing that efficiency loss and behaviour should be integrated into future policy approaches.}}, author = {{Hueppe, Christian and Geppert, Jasmin and Moenninghoff-Juessen, Julia and Wolff, Lena and Stamminger, Rainer and Paul, Andreas and Elsner, Andreas and Vrabec, Jadran and Wagner, Hendrik and Hoelscher, Heike and Becker, Wolfgang and Gries, Ulrich and Freiberger, Alfred}}, issn = {{0301-4215}}, journal = {{Energy Policy}}, title = {{{Investigating the real life energy consumption of refrigeration appliances in Germany: Are present policies sufficient?}}}, doi = {{10.1016/j.enpol.2021.112275}}, year = {{2021}}, } @inproceedings{44222, author = {{Jende, Yvonne Kristin}}, booktitle = {{The Place of Memory and the Memory of Place, International Conference}}, location = {{London}}, publisher = {{London Centre of Interdisciplinary Research}}, title = {{{Crossraods of Collective Memory. Canadian Memoir at the Junction of lieux and nœuds de mémoire.}}}, year = {{2021}}, }