@inproceedings{43047, author = {{Hollenhorst, Viola and Kenig, Eugeny Y.}}, location = {{Frankfurt am Main }}, title = {{{CFD-Untersuchungen der Fluiddynamik und des Wärmetransports an rauen Oberflächen}}}, year = {{2023}}, } @phdthesis{52402, abstract = {{Füllkörper spielen in industriellen Trennprozessen eine wichtige Rolle bspw. bei der Reinigung industrieller Abgase durch Absorption. Die Trennleistung von Füllkörperkolonnen wird üblicherweise mittels vereinfachter Stufenmodelle ermittelt, deren Modellparameter experimentell bestimmt werden müssen. Dies stellt eine große Schwäche von Stufenmodellen dar, da diese Parameterim Allgemeinen nicht auf verschiedene Stoffsysteme und Füllkörpertypen übertragbar sind.In dieser Arbeit wird ein Modell, basierend auf dem hydrodynamischen Analogieansatz, zur Beschreibung von Absorptionsvorgängen in Füllkörperkolonnen vorgestellt. Dabei ist die Geometrie der festen Phase direkt abhängig von der Füllkörpergeometrie und der Stochastik der Schüttung. Die tatsächlichen Strömungsverhältnisse in Füllkörperkolonnen werden erfasst und durch eine Kombination vereinfachter charakteristischer Strömungsformen reproduziert. Dies erlaubt die Verwendung rigoroser Transportgleichung. Dadurch enthält das Modell weniger experimentell zu ermittelnde Parameter und ist damit unabhängiger von Experimenten als vereinfachte Stufenmodelle. Das Modell wurde gegen experimentelle Daten zur CO2-Absorption in wässrige Natronlauge validiert. Mit dem entwickelten Modell wurde anschließend eine Parameterstudie durchgeführt, die der Unterstützung der Entwicklung neuer Füllkörpergeometrien dient. Dazu wurde eine Simulationsstudie durchgeführt, die den Einfluss der Füllkörpergeometrie auf die Trennleistung untersucht.}}, author = {{Salten, Alexander Heinrich Johannes}}, publisher = {{LibreCat University}}, title = {{{Modellierung der Reaktivabsorption in regellosen Schüttungen und modellbasierte Optimierung von Füllkörpern mit dem Ansatz der hydrodynamischen Analogien}}}, doi = {{10.17619/UNIPB/1-1757}}, year = {{2023}}, } @inproceedings{50547, author = {{Haak, Viktor and Meschut, Gerson and Epperlein, Maike and Schiebahn, Alexander and Reisgen, Uwe}}, booktitle = {{25. DVS-Sondertagung Widerstandsschweißen}}, location = {{Duisburg}}, title = {{{Einseitiges Widerstandselementschweißen für die stahlintensive Mischbauweise}}}, year = {{2023}}, } @article{47551, author = {{Hochhaus, Thorben and Bruns, Bastian and Grünewald, Marcus and Riese, Julia}}, issn = {{0098-1354}}, journal = {{Computers & Chemical Engineering}}, keywords = {{Computer Science Applications, General Chemical Engineering}}, publisher = {{Elsevier BV}}, title = {{{Optimal scheduling of a large-scale power-to-ammonia process: Effects of parameter optimization on the indirect demand response potential}}}, doi = {{10.1016/j.compchemeng.2023.108132}}, volume = {{170}}, year = {{2023}}, } @article{51360, author = {{Röder, Lilli Sophia and Gröngröft, Arne and Grünewald, Marcus and Riese, Julia}}, journal = {{Chemical Engineering Transactions}}, pages = {{421--426}}, title = {{{Demand Side Management Implementation in Downstream Digestate Treatment of a Biomethane Biorefinery}}}, doi = {{10.3303/CET23105071}}, volume = {{105}}, year = {{2023}}, } @article{49580, abstract = {{AbstractThe time‐dependent adjustment of a system's power demand simultaneously with current power generation is commonly referred to as demand side management (DSM). DSM strategies are based on the flexibility to purchase electricity at times when prices are low, which can result in monetary benefits. One option to increase the flexibility of continuously operated processes is to oversize them. From an economic point of view, this leads to an increased investment. DSM only serves an economic purpose if the monetary benefits exceed this increase in capital costs. The main goal of this contribution is to develop a decision support tool to help evaluate unit operations regarding their feasibility for DSM implementation. In a case study, the decision support tool was applied to show its functionality on a biomethane production plant. The results show that with the help of the decision support tool, evaluating unit operations concerning their economic DSM potential is possible.}}, author = {{Röder, Lilli and Etzold, Hendrik and Gröngröft, Arne and Grünewald, Marcus and Riese, Julia}}, issn = {{1932-104X}}, journal = {{Biofuels, Bioproducts and Biorefining}}, keywords = {{Renewable Energy, Sustainability and the Environment, Bioengineering}}, publisher = {{Wiley}}, title = {{{Decision support tool to determine the suitability of demand side management implementation in continuously operated processes – A biorefinery case study}}}, doi = {{10.1002/bbb.2558}}, year = {{2023}}, } @article{52337, author = {{Intveen, Julie}}, journal = {{Englisch betrifft uns}}, number = {{4}}, pages = {{1--5}}, title = {{{“I was trying to protect you. I was trying to keep you safe.” Parental surveillance in the Black Mirror episode Arkangel}}}, year = {{2023}}, } @article{52334, author = {{Intveen, Julie and Bauer, Maike}}, journal = {{Englisch betrifft uns}}, number = {{5}}, pages = {{1--5}}, title = {{{The United Kingdom: A Multicultural Society Education as a key to life in mixed communities}}}, year = {{2023}}, } @article{52335, author = {{Intveen, Julie and Bauer, Maike}}, journal = {{Englisch betrifft uns}}, number = {{5}}, pages = {{19--22}}, title = {{{The Royal Divide - Exploring the impact of Megxit on the future of the British monarchy}}}, year = {{2023}}, } @inbook{50212, author = {{Abrego, Verónica and Henke, Ina and Kißling, Magdalena and Lammer, Christina and Leuker, Maria-Th.}}, booktitle = {{Intersektionalität und erzählte Welten. Fachwissenschaftliche und fachdidaktische Perspektiven auf Literatur und Medien}}, editor = {{Abgrego, Verónica and Henke, Ina and Kißling, Magdalena and Lammer, Christina and Leuker, Maria-Th.}}, pages = {{11--34}}, publisher = {{WBG}}, title = {{{Intersektionalität und erzählte Welten – Einführung}}}, doi = {{https://doi.org/10.21248/gups.73811}}, year = {{2023}}, } @misc{52389, author = {{Lammer, Christina}}, publisher = {{BelgienNet}}, title = {{{Het verschil tussen strips en graphic novels (in Vlaanderen)}}}, year = {{2023}}, } @article{52204, author = {{Genovese, Matteo and Schlüter, Alexander and Scionti, Eugenio and Piraino, Francesco and Corigliano, Orlando and Fragiacomo, Petronilla}}, issn = {{0360-3199}}, journal = {{International Journal of Hydrogen Energy}}, keywords = {{Hydrogen economy, Green hydrogen, Power-to-X, Hydrogen-to-X, Sector coupling}}, number = {{44}}, pages = {{16545--16568}}, publisher = {{Elsevier BV}}, title = {{{Power-to-hydrogen and hydrogen-to-X energy systems for the industry of the future in Europe}}}, doi = {{10.1016/j.ijhydene.2023.01.194}}, volume = {{48}}, year = {{2023}}, } @unpublished{50171, abstract = {{We use QCD kinetic theory to compute photon production in the chemically equilibrating Quark-Gluon Plasma created in the early stages of high-energy heavy-ion collisions. We do a detailed comparison of pre-equilibrium photon rates to the thermal photon production. We show that the photon spectrum radiated from a hydrodynamic attractor evolution satisfies a simple scaling form in terms of the specific shear viscosity $\eta/s$ and entropy density $dS/d\zeta \sim {\scriptstyle \left(T\tau^{1/3}\right)^{3/2}}_\infty$. We confirm the analytical predictions with numerical kinetic theory simulations. We use the extracted scaling function to compute the pre-equilibrium photon contribution in $\sqrt{s_{NN}}=2.76\,\text{TeV}$ 0-20\% PbPb collisions. We demonstrate that our matching procedure allows for a smooth switching from pre-equilibrium kinetic to thermal hydrodynamic photon production. Finally, our publicly available implementation can be straightforwardly added to existing heavy ion models.}}, author = {{Oscar Garcia-Montero, Oscar Garcia-Montero and Mazeliauskas, Aleksas and Plaschke, Philip and Schlichting, Sören}}, booktitle = {{arXiv:2308.09747}}, title = {{{Pre-equilibrium photons from the early stages of heavy-ion collisions}}}, year = {{2023}}, } @phdthesis{48010, author = {{Schneider, Jennifer Nicole}}, title = {{{Open Educational Resources in der beruflichen Bildungslandschaft}}}, year = {{2023}}, } @article{40645, author = {{Al-Lami, Abbas Jarullah Sangoor and Kenig, Eugeny}}, journal = {{International Journal of Heat and Mass Transfer}}, pages = {{1--10}}, publisher = {{Elsevier}}, title = {{{Experimental Study of an Internally Channeled Tube Heat Exchanger under Turbulent Flow Conditions}}}, doi = {{10.1016/j.ijheatmasstransfer.2023.124425}}, volume = {{214}}, year = {{2023}}, } @misc{51019, author = {{Unterstell, Rembert}}, pages = {{6--9}}, publisher = {{DFG}}, title = {{{Der Wirtschaft auch in der Krise das Atmen erlauben, Pandemie und Ökonomie – Interview mit Steuerexpertin Caren Sureth-Sloane}}}, year = {{2023}}, } @misc{51024, author = {{Unterstell, Rembert}}, pages = {{8--11}}, publisher = {{DFG}}, title = {{{Allowing the Economy to Breathe Even During the Crisis – Interview with Tax Expert Caren Sureth-Sloane}}}, year = {{2023}}, } @inproceedings{43090, abstract = {{Abstract. The application of the mechanical joining process clinching allows the assembly of different sheet metal materials with a wide range of material thickness configurations, which is of interest for lightweight multi-material structures. In order to be able to predict the clinched joint properties as a function of the individual manufacturing steps, current studies focus on numerical modeling of the entire clinching process chain. It is essential to be able to take into account the influence of the joining process-induced damage on the load-bearing capacity of the joint during the loading phase. This study presents a numerical damage accumulation in the clinching process based on an implemented Hosford-Coulomb failure model using a 3D clinching process model applied on the aluminum alloy EN AW-6014 in temper T4. A correspondence of the experimentally determined failure location with the element of the highest numerically determined damage accumulation is shown. Moreover, the experimentally determined failure behavior is predicted to be in agreement in the numerical loading simulation with transferred pre-damage from the process simulation. }}, author = {{Bielak, Christian Roman and Böhnke, Max and Friedlein, Johannes and Bobbert, Mathias and Mergheim, Julia and Steinmann, Paul and Meschut, Gerson}}, booktitle = {{Materials Research Proceedings}}, issn = {{2474-395X}}, publisher = {{Materials Research Forum LLC}}, title = {{{Numerical analysis of failure modeling in clinching process chain simulation}}}, doi = {{10.21741/9781644902417-33}}, year = {{2023}}, } @inproceedings{43462, abstract = {{Abstract. In the numerical simulation of mechanical joining technologies such as clinching, the material modeling of the joining parts is of major importance. This includes modeling the damage and failure behavior of the materials in accordance with varying occurring stress states. This paper presents a calibration method of three different fracture models. The calibration of the models is done by use of experimental data from a modified punch test, tensile test and bulge test in order to map the occurring stress states from clinching processes and to precisely model the resulting failure behavior. Experimental investigations were carried out for an aluminum alloy EN AW-6014 in temper T4 and compared with the simulative results generated in LS-DYNA. The comparison of force-displacement curves and failure initiation shows that the Hosford–Coulomb model predicts the failure behavior for the material used and the tests applied with the best accuracy. }}, author = {{Böhnke, Max and Bielak, Christian Roman and Friedlein, Johannes and Bobbert, Mathias and Mergheim, Julia and Steinmann, Paul and Meschut, Gerson}}, booktitle = {{Materials Research Proceedings}}, issn = {{2474-395X}}, publisher = {{Materials Research Forum LLC}}, title = {{{A calibration method for failure modeling in clinching process simulations}}}, doi = {{10.21741/9781644902417-34}}, year = {{2023}}, } @inbook{52454, author = {{Böhnke, Max and Bielak, Christian Roman and Bobbert, Mathias and Meschut, Gerson}}, booktitle = {{Lecture Notes in Mechanical Engineering}}, isbn = {{9783031413407}}, issn = {{2195-4356}}, publisher = {{Springer Nature Switzerland}}, title = {{{Experimental and Numerical Investigation of Clinched Joints Under Shear Tensile Loading at High Strain Rates}}}, doi = {{10.1007/978-3-031-41341-4_12}}, year = {{2023}}, }