TY - CHAP
AU - Morrien, Rita
ED - Eke, Norbert Otto
ED - Elit, Stefan
ID - 49210
T2 - Werke im Dialog. (Virtuelle) Begegnungen anlässlich von 40 Jahren Paderborner Gastdozentur für Schriftstellerinnen und Schriftsteller
TI - 'Pappeln, die grüne Messer sind' und 'ratlose Brillenbären in Zoo'. Deformierte Naturverhältnisse bei Angela Krauß und Herta Müller
ER -
TY - JOUR
AB - Data collection and aggregation by online services happens to an extent that is often beyond awareness and comprehension of its users. Transparency tools become crucial to inform people, though it is unclear how well they work. To investigate this matter, we conducted a user study focusing on Facebook, which has recently released the 'Off-Facebook Activity' transparency dashboard that informs about personal data collection from third parties. We exposed a group of n = 100 participants to the dashboard and surveyed their level of awareness and reactions to understand how transparency impacts users' privacy attitudes and intended behavior. Our participants were surprised about the massive amount of collected data, became significantly less comfortable with data collection, and more likely to take protective measures. Collaterally, we observed that current consent schemes are inadequate. Based on the survey findings, we make recommendations for more usable transparency and highlight the need to raise awareness about transparency tools and to provide easily actionable privacy controls.
AU - Arias-Cabarcos, Patricia
AU - Khalili, Saina
AU - Strufe, Thorsten
ID - 48061
IS - 1
JF - Proceedings on Privacy Enhancing Technologies
KW - General Medicine
SN - 2299-0984
TI - 'Surprised, Shocked, Worried'}: User Reactions to Facebook Data Collection from Third Parties
VL - 2023
ER -
TY - CHAP
AU - Taschl-Erber, Andrea
ED - Reese-Schnitker, Annegret
ED - Müllner, Ilse
ED - Kutzer, Mirja
ID - 37813
T2 - Heilige Texte. Verständigungen zwischen Theologie und Kulturwissenschaft
TI - (K)ein Ende des „Alten Bundes“? Paulinische Schrifthermeneutik in 2 Kor 3
ER -
TY - CHAP
AU - Taschl-Erber, Andrea
ED - Kutzer, Mirja
ED - Müllner, Ilse
ED - Reese-Schnitker, Annegret
ID - 49817
T2 - Heilige Texte. Verständigungen zwischen Theologie und Kulturwissenschaft
TI - (K)ein Ende des "Alten Bundes"? Paulinische Schrifthermeneutik in 2 Kor 3,
ER -
TY - CONF
AU - Behler, Felix
ID - 45676
T2 - Narrative Ethics and Character in the Representation of the Past in Contemporary Fiction
TI - (Re-)inventing Biblical Traditions: The Representation of Pontius Pilate in Contemporary Historical Fiction
ER -
TY - JOUR
AU - Böker, Ines
ID - 49246
JF - Limbus. Australisches Jahrbuch für germanistische Literatur und Kulturwissenschaft
TI - (Ver-)störendes Held*innentum. Figurationen und Repräsentationen von Soldatinnen und Soldaten in postheroischen Kriegszeiten
ER -
TY - JOUR
AU - Vöing, Nerea
ID - 46622
JF - Lehren im Leben - Blog der Stiftung Innovation in der Hochschullehre
TI - 16 Fragen, 16 Antworten: In unserer Rubrik „Lehren im Leben” stellen wir Menschen vor, die Hochschullehre gestalten. Folge 6: Dr. Nerea Vöing
VL - 6
ER -
TY - GEN
ED - Eke, Norbert
ED - Elit, Stefan
ID - 50976
IS - Jg. 142
T2 - Zeitschrift für deutsche Philologie
TI - 2. Werke im Dialog. (Virtuelle) Begegnungen in 40 Jahren „Paderborner Gastdozentur für Schriftstellerinnen und Schriftsteller“
VL - Sonderheft
ER -
TY - GEN
AU - Harst, Simon
AU - Schanz, Deborah
AU - Siegel, Felix
AU - Sureth-Sloane, Caren
ID - 49549
TI - 2022 Global MNC Tax Complexity Survey
ER -
TY - CHAP
AU - Kruse, Anne
AU - Müller, Laura
AU - Ott, Manuel
AU - Jung, Philipp
AU - Koch, Rainer
AU - Hügel, Joachim
AU - Finke, Florian
AU - Winter, Stephan
AU - Gust, Thomas
ID - 52698
SN - 2366-1127
T2 - Personennahe Dienstleistungen der Zukunft
TI - 3D-Druck – Eine Technologie als Schlüssel zur Steigerung der Teilhabe
ER -
TY - JOUR
AB - This paper reveals the 3D character of the intermetallic layer at the aluminum–steel interface which pops
up above the original sample surface during annealing. Popping out of the intermetallics was proven using
atomic force microscopy. The phase expands out of the plane due to the exothermic formation of the Al5Fe2
phase and the feasibility of surface diffusion. Milling by a focused ion beam enabled the comparison of the
chemical composition of the surface layer with the bulk interface, showing no difference. The growth direction
is both towards aluminum and steel — the main diffusion flux is from aluminum towards steel, and the new
intermetallic phase emerges at the steel side. The shortage of Al atoms causes a shift of the intermetallic as a
whole towards aluminum.
AU - Šlapáková, Michaela
AU - Kihoulou, Barbora
AU - Veselý, Jozef
AU - Minárik, Peter
AU - Fekete, Klaudia
AU - Knapek, Michal
AU - Králík, Rostislav
AU - Grydin, Olexandr
AU - Stolbchenko, Mykhailo
AU - Schaper, Mirko
ID - 43441
JF - Vacuum
KW - Al-steel clad
KW - twin-roll casting
KW - 3D characterization
KW - atomic force microscopy
KW - diffusion direction
KW - surface growth
SN - 0042-207X
TI - 3D-structure of intermetallic interface layer in Al–steel clad material
VL - 212
ER -
TY - CHAP
AU - Dehmel, Lukas
ED - Kondratjuk, Maria
ID - 46473
T2 - Grundlagen der Erwachsenen- und Weiterbildungsforschung
TI - 6.3.2 Medienpädagogische Professionalisierung in der beruflichen Weiterbildung. Eine Studie aus Perspektive der biografischen Medienforschung. Steckbrief zur Dissertation.
ER -
TY - JOUR
AU - Prikoszovits, Matthias
ID - 51325
IS - 2-3
JF - Informationen Deutsch als Fremdsprache
KW - General Medicine
SN - 2511-0853
TI - Deutsch für den Beruf [Sammelrezension] Sander, Isa-Lou; Efing, Christian (Hrsg.): Der Betrieb als Sprachlernort. Tübingen: Narr Francke Attempto, 2021 (Kommunizieren im Beruf, 4). -- ISBN 978-3-8233-8442-7. 264 Seiten, € 68,00. Tichy, Ellen; Tesch, Felicitas (Hrsg.): Deutsch in Fach und Beruf. Aktuelle Fragen und neue Ansätze der Fremdsprachenvermittlung. Berlin: Peter Lang, 2021 (Berufssprache Deutsch in Theorie und Praxis, 2). -- ISBN 978-3-631-79553-8. 194 Seiten, € 49,95. Niederhaus, Constanze: Deutsch für den Beruf. Eine Einführung. Berlin: Erich Schmidt, 2022 (Grundlagen Deutsch als Fremd- und Zweitsprache, 4). -- ISBN 978-3-503-20545-5. 265 Seiten, € 22,00.
VL - 50
ER -
TY - CHAP
AU - Elit, Stefan
ED - Auer, Michael
ID - 49710
T2 - Klopstock-Handbuch. Leben – Werk – Wirkung
TI - [Klopstocks] Liebe und Freundschaft
ER -
TY - CHAP
AU - Elit, Stefan
ED - Auer, Michael
ID - 49709
T2 - Klopstock-Handbuch. Leben – Werk – Wirkung
TI - [Klopstocks] Sprachtheoretische Schriften
ER -
TY - GEN
AU - Eke, Norbert
ID - 50994
IS - 2
TI - [zu:] Martin Kagel, David Z. Saltz (Ed.): Open Wounds: Holocaust Theater and the Le-gacy of George Tabori.
ER -
TY - JOUR
AU - Hanusch, Maximilian
ID - 34814
IS - 1
JF - Canadian Journal of Mathematics
KW - extension of differentiable maps
SN - 0008-414X
TI - A $C^k$-seeley-extension-theorem for Bastiani’s differential calculus
VL - 75
ER -
TY - GEN
AU - Iftekhar, Mohammed
AU - Nagaraju, Harshan
AU - Kneuper, Pascal
AU - Sadiye, Babak
AU - Müller, Wolfgang
AU - Scheytt, J. Christoph
ID - 47064
T2 - BCICTS 2023 IEEE BiCMOS and Compound Semiconductor Integrated Circuits and Technology Symposium
TI - A 28-Gb/s 27.2 mW NRZ Full-Rate Bang-Bang Clock and Data Recovery in 22 nm FD-SOI CMOS Technology
ER -
TY - GEN
AU - Iftekhar, Mohammed
AU - Gowda, Harshan
AU - Kneuper, Pascal
AU - Sadiye, Babak
AU - Müller, Wolfgang
AU - Scheytt, Christoph
ID - 48961
T2 - 2023 IEEE BiCMOS and Compound Semiconductor Integrated Circuits and Technology Symposium (BCICTS)
TI - A 28-Gb/s 27.2mW NRZ Full-Rate Bang-Bang Clock and Data Recovery in 22 nm FD-SOI CMOS Technology
ER -
TY - GEN
AU - Kraft, Kerstin
ID - 52527
TI - A Bouquet of Encounters With Faux Flora Across Time – A Visual Essay.
ER -
TY - CONF
AB - 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.
AU - Böhnke, Max
AU - Bielak, Christian Roman
AU - Friedlein, Johannes
AU - Bobbert, Mathias
AU - Mergheim, Julia
AU - Steinmann, Paul
AU - Meschut, Gerson
ID - 43462
SN - 2474-395X
T2 - Materials Research Proceedings
TI - A calibration method for failure modeling in clinching process simulations
ER -
TY - JOUR
AB - Abstract
Purpose
Wearables serve to quantify the on-court activity in intermittent sports such as field hockey (FH). Based on objective data, benchmarks can be determined to tailor training intensity and volume. Next to average and accumulated values, the most intense periods (MIPs) during competitive FH matches are of special interest, since these quantify the peak intensities players experience throughout the intermittent matches. The aim of this study was to retrospectively compare peak intensities between training and competition sessions in a male FH team competing in the first german division.
Methods
Throughout an 8-week in-season period, 372 individual activity datasets (144 datasets from competitive sessions) were recorded using the Polar Team Pro sensor (Kempele, Finland). MIPs were calculated applying a rolling window approach with predefined window length (1–5 min) and calculated for Total distance, High-Intensity-Running distance (> 16 km/h), Sprinting distance (> 20 km/h) and Acceleration load. Significant differences between training and competition MIPs were analysed through non-parametric statistical tests (P < 0.05).
Results
Analyses revealed higher MIPs during competition for all considered outcomes (P < 0.001). Effect size estimation revealed strongest effects for sprinting distance (d = 1.89 to d = 1.22) and lowest effect sizes for acceleration load (d = 0.92 to d = 0.49).
Conclusion
The present findings demonstrate that peak intensities during training do not reach those experienced during competitive sessions in a male FH team. Training routines such as manipulations of court-dimensions and team sizes might contribute to this discrepancy. Coaches should compare training and competition intensities to recalibrate training routines to optimize athletes’ preparation for competition.
AU - Büchel, Daniel
AU - Döring, Michael
AU - Baumeister, Jochen
ID - 49636
JF - Journal of Science in Sport and Exercise
KW - Nutrition and Dietetics
KW - Rehabilitation
KW - Orthopedics and Sports Medicine
KW - Physical Therapy
KW - Sports Therapy and Rehabilitation
KW - Physiology
SN - 2096-6709
TI - A Comparison of the Most Intense Periods (MIPs) During Competitive Matches and Training Over an 8-Week Period in a Male Elite Field Hockey Team
ER -
TY - GEN
AB - This preprint makes the claim of having computed the $9^{th}$ Dedekind
Number. This was done by building an efficient FPGA Accelerator for the core
operation of the process, and parallelizing it on the Noctua 2 Supercluster at
Paderborn University. The resulting value is
286386577668298411128469151667598498812366. This value can be verified in two
steps. We have made the data file containing the 490M results available, each
of which can be verified separately on CPU, and the whole file sums to our
proposed value.
AU - Van Hirtum, Lennart
AU - De Causmaecker, Patrick
AU - Goemaere, Jens
AU - Kenter, Tobias
AU - Riebler, Heinrich
AU - Lass, Michael
AU - Plessl, Christian
ID - 43439
T2 - arXiv:2304.03039
TI - A computation of D(9) using FPGA Supercomputing
ER -
TY - JOUR
AU - Krämer, Felix
AU - Paradies, Jan
AU - Fernández, Israel
AU - Breher, Frank
ID - 47589
JF - Nature Chemistry
KW - General Chemical Engineering
KW - General Chemistry
SN - 1755-4330
TI - A crystalline aluminium–carbon-based ambiphile capable of activation and catalytic transfer of ammonia in non-aqueous media
ER -
TY - CONF
AU - Ködding, Patrick
AU - Tissen, Denis
AU - Koldewey, Christian
ID - 49322
T2 - Proceedings of the 56th CIRP Conference on Manufacturing Systems, CIRP CMS ‘23
TI - A Data Map for Product Creation: Tasks, Data Flows, and IT-Systems from the Initial Idea to the Start of Production
ER -
TY - JOUR
AU - Hamdoun, Ayoub
AU - Mahnken, Rolf
ID - 44892
IS - 1
JF - PAMM
KW - Electrical and Electronic Engineering
KW - Atomic and Molecular Physics
KW - and Optics
SN - 1617-7061
TI - A finite strain gradient theory for viscoplasticity by means of micromorphic regularization
VL - 22
ER -
TY - JOUR
AU - Roos, E.
AU - Sebastiani, D.
AU - Brehm, Martin
ID - 45012
JF - Phys. Chem. Chem. Phys.
TI - A Force Field for Bio-Polymers in Ionic Liquids (BILFF) – Part 2: Cellulose in [EMIm][OAc] / Water Mixtures
VL - 25 (12)
ER -
TY - CONF
AU - Brock, Jonathan
AU - Rempe, Niclas
AU - von Enzberg, Sebastian
AU - Kühn, Arno
AU - Dumitrescu, Roman
ID - 49365
T2 - 5th Conference on Production Systems and Logistics
TI - A Framework For The Domain-Driven Utilization Of Manufacturing Sensor Data In Process Mining: An Action Design Approach
ER -
TY - CONF
AU - Blömer, Johannes
AU - Bobolz, Jan
AU - Porzenheim, Laurens Alexander
ID - 43458
TI - A Generic Construction of an Anonymous Reputation System and Instantiations from Lattices
ER -
TY - CONF
AU - Brunner-Schwer, Christian
AU - Biegler, Max
AU - Rethmeier, Michael
AU - Schmolke, Tobias
AU - Meschut, Gerson
AU - Spohr, Sebastian
AU - Eckstein, Lutz
ID - 45877
TI - A life cycle assessment of joining processes in the automotive industry, illustrated by the example of an EV battery case
ER -
TY - GEN
AB - In the Bogoliubov-Fr\"ohlich model, we prove that an impurity immersed in a
Bose-Einstein condensate forms a stable quasi-particle when the total momentum
is less than its mass times the speed of sound. The system thus exhibits
superfluid behavior, as this quasi-particle does not experience friction. We do
not assume any infrared or ultraviolet regularization of the model, which
contains massless excitations and point-like interactions.
AU - Hinrichs, Benjamin
AU - Lampart, Jonas
ID - 51376
T2 - arXiv:2311.05361
TI - A Lower Bound on the Critical Momentum of an Impurity in a Bose-Einstein Condensate
ER -
TY - JOUR
AU - Fuchs, Christian
ID - 46749
IS - 6
JF - Theory and Society
TI - A Marxist-Humanist Perspective on Stuart Hall's Communication Theory
VL - 52
ER -
TY - JOUR
AU - Burmeister, Sascha Christian
AU - Guericke, Daniela
AU - Schryen, Guido
ID - 47431
JF - Flexible Services and Manufacturing Journal
TI - A Memetic NSGA-II for the Multi-Objective Flexible Job Shop Scheduling Problem with Real-time Energy Tariffs
ER -
TY - CONF
AU - Lenz, Cederic
AU - Henke, Christian
AU - Trächtler, Ansgar
ID - 48570
T2 - 2023 IEEE 21st International Conference on Industrial Informatics (INDIN)
TI - A Methodical Approach to Hybrid Modelling for Contextual Anomaly Detection on Time-Series Data
ER -
TY - JOUR
AB - AbstractCold‐box sand (CBS) belongs to the granular materials and consists of sand and a binder. The behavior of CBS is simulated with a micropolar model, whereby the additional degree of freedom of the model describes the rotation of the sand grains. The model is used to generate a shear band under pressure for three different meshes, where the force‐displacement curves of the three meshes converge so that no mesh dependence occurs. Another requirement of the model is the consideration of asymmetric behavior for compression and tension. Due to the additional degree of freedom the implicit implementation of the micropolar continuum is very time‐consuming. Therefore, an explicit implementation is considered as an alternative possibility. This paper compares the advantages and disadvantages of both methods and the results for both calculations.
AU - Börger, Alexander
AU - Mahnken, Rolf
ID - 52219
JF - PAMM
KW - Electrical and Electronic Engineering
KW - Atomic and Molecular Physics
KW - and Optics
SN - 1617-7061
TI - A micropolar model accounting for asymmetric behavior of cold‐box sand in relation to tensile and compression tests
ER -
TY - JOUR
AU - Kurock, Ricarda
AU - Teichert, Jeannine
AU - Meister, Dorothee M.
AU - Gerhardts, Lara
AU - Buhl, Heike M.
AU - Bonanati, Sabrina
ID - 48370
IS - 14
JF - Journal of Adolescence
TI - A mixed-methods study of the quality of parental support during adolescents' information-related Internet use as a co-construction process
VL - 1
ER -
TY - JOUR
AB - I study the effect of heterogeneous beliefs about asset prices on the long-term behavior of financial markets. Starting from the ideas of Abreu and Brunnermeier (Citation2003), a two-dimensional system of differential equations is developed. The first dynamic variable is the asset price growth rate. The second dynamic variable is the number of investors who believe that asset prices are abnormally high. In a phase plane analysis, I find both stable and unstable equilibria, depending on the spread of information and the response to other agents’ beliefs. If individuals try to increase their returns while perceiving more overpricing, these equilibria can be spirals or even approach limit cycles. Although I intend to study general price patterns, abnormally high asset prices can be caused by financial bubbles. In this model, bubbles can emerge and deflate both in cycles or directly, or they can grow until they burst. Further, I analyze market behavior after a central bank increases the interest rate. This can lead to new stable equilibria, but the emergence and bursting of bubbles cannot be prevented.
AU - Burs, Carina
ID - 49309
IS - 2
JF - Cogent Economics & Finance
KW - asset pricing
KW - subjective information
KW - stability conditions
KW - monetary policy
KW - risk aversion
SN - 2332-2039
TI - A model of cycles and bubbles under heterogeneous beliefs in financial markets
VL - 11
ER -
TY - JOUR
AB - We present strong enhancement of third harmonic generation in an amorphous silicon metasurface consisting of elliptical nano resonators. We show that this enhancement originates from a new type of multi-mode Fano mechanism. These ‘Super-Fano’ resonances are investigated numerically in great detail using full-wave simulations. The theoretically predicted behavior of the metasurface is experimentally verified by linear and nonlinear transmission spectroscopy. Moreover, quantitative nonlinear measurements are performed, in which an absolute conversion efficiency as high as ηmax ≈ 2.8 × 10−7 a peak power intensity of 1.2 GW cm−2 is found. Compared to an unpatterned silicon film of the same thickness amplification factors of up to ~900 are demonstrated. Our results pave the way to exploiting a strong Fano-type multi-mode coupling in metasurfaces for high THG in potential applications.
AU - Hähnel, David
AU - Golla, Christian
AU - Albert, Maximilian
AU - Zentgraf, Thomas
AU - Myroshnychenko, Viktor
AU - Förstner, Jens
AU - Meier, Cedrik
ID - 44097
IS - 1
JF - Light: Science & Applications
KW - tet_topic_meta
SN - 2047-7538
TI - A multi-mode super-fano mechanism for enhanced third harmonic generation in silicon metasurfaces
VL - 12
ER -
TY - GEN
AB - Sparsity is a highly desired feature in deep neural networks (DNNs) since it ensures numerical efficiency, improves the interpretability of models (due to the smaller number of relevant features), and robustness. In machine learning approaches based on linear models, it is well known that there exists a connecting path between the sparsest solution in terms of the $\ell^1$ norm,i.e., zero weights and the non-regularized solution, which is called the regularization path. Very recently, there was a first attempt to extend the concept of regularization paths to DNNs by means of treating the empirical loss and sparsity ($\ell^1$ norm) as two conflicting criteria and solving the resulting multiobjective optimization problem. However, due to the non-smoothness of the $\ell^1$ norm and the high number of parameters, this approach is not very efficient from a computational perspective. To overcome this limitation, we present an algorithm that allows for the approximation of the entire Pareto front for the above-mentioned objectives in a very efficient manner. We present numerical examples using both deterministic and stochastic gradients. We furthermore demonstrate that knowledge of the regularization path allows for a well-generalizing network parametrization.
AU - Amakor, Augustina Chidinma
AU - Sonntag, Konstantin
AU - Peitz, Sebastian
ID - 51159
T2 - arXiv
TI - A multiobjective continuation method to compute the regularization path of deep neural networks
ER -
TY - JOUR
AU - Kruse, Stephan
AU - Greitens, Jan C.
AU - Schwabe, Tobias
AU - Kneuper, Pascal
AU - Kurz, Heiko G.
AU - Scheytt, J. Christoph
ID - 47126
JF - IEEE Microwave and Wireless Technology Letters
TI - A Narrowband Four-Quadrant Electro-Optical Mixer for Microwave Photonics
ER -
TY - JOUR
AB - The algorithmic imaginary as a theoretical concept has received increasing attention in recent years as it aims at users’ appropriation of algorithmic processes operating in opacity. But the concept originally only starts from the users’ point of view, while the processes on the platforms’ side are largely left out. In contrast, this paper argues that what is true for users is also valid for algorithmic processes and the designers behind. On the one hand, the algorithm imagines users’ future behavior via machine learning, which is supposed to predict all their future actions. On the other hand, the designers anticipate different actions that could potentially performed by users with every new implementation of features such as social media feeds. In order to bring into view this permanently reciprocal interplay coupled to the imaginary, in which not only the users are involved, I will argue for a more comprehensive and theoretically precise algorithmic imaginary referring to the theory of Cornelius Castoriadis. In such a perspective, an important contribution can be formulated for a theory of social media platforms that goes beyond praxeocentrism or structural determinism.
AU - Schulz, Christian
ID - 51345
IS - 3
JF - Media, Culture & Society
KW - Sociology and Political Science
KW - Communication
SN - 0163-4437
TI - A new algorithmic imaginary
VL - 45
ER -
TY - CONF
AU - Schöppner, Volker
AU - Austermeier, Laura
AU - Nordieker, A.
ID - 48651
TI - A NEW APPROACH FOR THE LOCAL DETERMINATION OF ENERGY INPUT IN CO-ROTATING TWIN SCREW EXTRUDERS BASED ON SCREW TORSION
ER -
TY - JOUR
AB - Abstract
Sandwich packings represent new separation column internals, with a potential to intensify mass transfer. They comprise two conventional structured packings with different specific geometrical surface areas. In this work, the complex fluid dynamics in sandwich packings is modeled using a novel approach based on a one-dimensional, steady momentum balance of the liquid and gas phases. The interactions between the three present phases (gas, liquid, and solid) are considered by closures incorporated into the momentum balance. The formulation of these closures is derived from two fluid-dynamic analogies for the film and froth flow patterns. The adjustable parameters in the closures are regressed for the film flow using dry pressure drop measurements and liquid hold-up data in trickle flow conditions. For the froth flow, the tuning parameters are fitted to overall pressure drop measurements and local liquid hold-up data acquired from ultra-fast X-ray tomography (UFXCT). The model predicts liquid hold-up and pressure drop data with an average relative deviation of 16.4 % and 19 %, respectively. Compared to previous fluid dynamic models for sandwich packings, the number of adjustable parameters could be reduced while maintaining comparable accuracy.
AU - Franke, Patrick
AU - Shabanilemraski, Iman
AU - Schubert, Markus
AU - Hampel, Uwe
AU - Kenig, Eugeny Y.
ID - 48580
JF - Chemical Product and Process Modeling
KW - Modeling and Simulation
KW - General Chemical Engineering
SN - 1934-2659
TI - A new approach to model the fluid dynamics in sandwich packings
ER -
TY - JOUR
AB - In spray-flame synthesis of nanoparticles, a precise understanding of the reaction processes is necessary to find optimal process parameters for the formation of the desired products. Coupling the chemistries of flame, solvent, and gas-phase species initially formed from the particle precursor in combination with the complex flow geometry of the spray flame means a special challenge for the modeling of the reaction processes. A new burner has been developed that is capable to observe the reaction of precursor solutions frequently used in spray-flame synthesis. The burner provides an almost flat, laminar, and steady flame with homogeneous addition of a fine aerosol and thus enables detailed investigation and modeling of the coupled reactions inde-pendent of spray formation and turbulent mixing. With its two separate supply channel matrices, the burner also enables the use of reactants that would otherwise react with each other already before reaching the flame. These features enable the investigation of a wide range of flame-based synthesis methods for nanoparticles and, due to the flat-flame geometry, kinetics models for these processes can be developed and validated. This work describes the matrix burner development and its gas flow optimization by simulation. Droplet-size dis-tributions generated by ultrasonic nebulization and their interaction with the burner structure are investigated by phase-Doppler anemometry. As an example for nanoparticle-for ming flames from solutions, iron-oxide nanoparticle-generating flames using iron(III) nitrate nonahydrate dissolved in 1-butanol were investigated. This effort includes measurements of two-dimensional maps of the flame temperature by a thermocouple and height-dependent concentration profiles of the main species by time-of-flight mass spectrometry. Exper-imental data are compared with 1D simulations using a reduced reaction mechanism. The results show that the new burner is well suited for the development of reaction models for precursors supplied in the liquid phase usually applied in spray-flame synthesis configurations.& COPY; 2022 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
AU - Apazeller, Sascha
AU - Gonchikzhapov, Munko
AU - Nanjaiah, Monika
AU - Kasper, Tina
AU - Wlokas, Irenäus
AU - Wiggers, Hartmut
AU - Schulz, Christof
ID - 53078
IS - 1
JF - Proceedings of the Combustion Institute
KW - Physical and Theoretical Chemistry
KW - Mechanical Engineering
KW - General Chemical Engineering
SN - 1540-7489
TI - A new dual matrix burner for one-dimensional investigation of aerosol flames
VL - 39
ER -
TY - JOUR
AU - Apazeller, Sascha
AU - Gonchikzhapov, Munko
AU - Nanjaiah, Monika
AU - Kasper, Tina
AU - Wlokas, Irenäus
AU - Wiggers, Hartmut
AU - Schulz, Christof
ID - 36812
JF - Proceedings of the Combustion Institute
KW - Physical and Theoretical Chemistry
KW - Mechanical Engineering
KW - General Chemical Engineering
SN - 1540-7489
TI - A new dual matrix burner for one-dimensional investigation of aerosol flames
ER -
TY - GEN
AU - Cheng, Chun
AU - Song, Chunlei
AU - Mahnken, Rolf
AU - Yuan, Zhipeng
AU - Yu, Liang
AU - Ju, Xiaozhe
ID - 44887
TI - A Non-Linear Mean-Field Debonding Model at Large Strains for the Analysis of Fibre Kinking in Ud Composites
ER -
TY - GEN
AU - Hilgert, Joachim
AU - Arends, C.
AU - Frahm, J.
ID - 51499
TI - A pairing formula for resonant states on finite regular graphs
ER -
TY - GEN
AB - We present a novel method for high-order phase reduction in networks of
weakly coupled oscillators and, more generally, perturbations of reducible
normally hyperbolic (quasi-)periodic tori. Our method works by computing an
asymptotic expansion for an embedding of the perturbed invariant torus, as well
as for the reduced phase dynamics in local coordinates. Both can be determined
to arbitrary degrees of accuracy, and we show that the phase dynamics may
directly be obtained in normal form. We apply the method to predict remote
synchronisation in a chain of coupled Stuart-Landau oscillators.
AU - von der Gracht, Sören
AU - Nijholt, Eddie
AU - Rink, Bob
ID - 45498
T2 - arXiv:2306.03320
TI - A parametrisation method for high-order phase reduction in coupled oscillator networks
ER -
TY - BOOK
ED - ija Grigorjevaite, Kadri Mettis, Katarina Stekic, Kristof Van de Keere, Marjana Brkic, Michael Lenke, Mikko-Jussi Laakso, Paulius Lukas Tamošiūnas, Sofia Karlsson, Sven Hüsing, Jurga Turčinavičienė, Violeta Šlekienė, Mart Laanpere, and Vidita Urboniene
ID - 47885
TI - A PRACTICAL HANDBOOK ON EFFECTIVE DEVELOPMENT AND IMPLEMENTATION OF STEAM TEACHING AT SCHOOL
ER -
TY - CONF
AU - Brock, Jonathan
AU - Löhr, Bernd
AU - Brennig, Katharina
AU - Seger, Thilo
AU - Bartelheimer, Christian
AU - von Enzberg, Sebastian
AU - Kühn, Arno
AU - Dumitrescu, Roman
ID - 47829
T2 - ECIS 2023 Proceedings at AIS Electronic Library (AISeL).
TI - A process mining maturity model: Enabling organizations to assess and improve their process mining activities
ER -
TY - CONF
AB - Organizations employ process mining to discover, check, or enhance process models based on data from information systems to improve business processes. Even though process mining is increasingly relevant in academia and organizations, achieving process mining excellence and generating business value through its application is elusive. Maturity models can help to manage interdisciplinary teams in their efforts to plan, implement, and manage process mining in organizations. However, while numerous maturity models on business process management (BPM) are available, recent calls for process mining maturity models indicate a gap in the current knowledge base. We systematically design and develop a comprehensive process mining maturity model that consists of five factors comprising 23 elements, which organizations need to develop to apply process mining sustainably and successfully. We contribute to the knowledge base by the exaptation of existing BPM maturity models, and validate our model through its application to a real-world scenario.
AU - Brock, Jonathan
AU - Löhr, Bernd
AU - Brennig, Katharina
AU - Seger, Thilo
AU - Bartelheimer, Christian
AU - von Enzberg, Sebastian
AU - Kühn, Arno
AU - Dumitrescu, Roman
ID - 50459
T2 - European Conference on Information Systems
TI - A Process Mining Maturity Model: Enabling Organizations to Assess and Improve their Process Mining Activities
ER -
TY - CONF
AU - Tissen, Denis
AU - Koldewey, Christian
AU - Dumitrescu, Roman
ID - 49318
TI - A process-model for tailoring prototyping of cyber-physical systems
ER -
TY - JOUR
AU - Kruse, Stephan
AU - Serino, Laura
AU - Folge, Patrick Fabian
AU - Echeverria Oviedo, Dana
AU - Bhattacharjee, Abhinandan
AU - Stefszky, Michael
AU - Scheytt, J. Christoph
AU - Brecht, Benjamin
AU - Silberhorn, Christine
ID - 45485
IS - 14
JF - IEEE Photonics Technology Letters
KW - Electrical and Electronic Engineering
KW - Atomic and Molecular Physics
KW - and Optics
KW - Electronic
KW - Optical and Magnetic Materials
SN - 1041-1135
TI - A Pulsed Lidar System With Ultimate Quantum Range Accuracy
VL - 35
ER -
TY - CONF
AU - Ködding, Patrick
AU - Koldewey, Christian
AU - Dumitrescu, Roman
ID - 47836
T2 - Proceedings of the XXXII ISPIM Innovation Conference
TI - A Reference Process Model for Scenario-based Foresight
ER -
TY - CHAP
AU - Dieter, Peter
ID - 46867
SN - 0302-9743
T2 - Lecture Notes in Computer Science
TI - A Regret Policy for the Dynamic Vehicle Routing Problem with Time Windows
ER -
TY - CONF
AU - Tölle, Laura
AU - Slawinski, Elena
AU - Fromm, Jennifer
AU - Mirbabaie, Milad
ID - 48228
TI - A Social Network Approach for Investigating Social Influences on Effective Use: Demonstration in Virtual Reality Collaboration
ER -
TY - JOUR
AB - Classic automated algorithm selection (AS) for (combinatorial) optimization problems heavily relies on so-called instance features, i.e., numerical characteristics of the problem at hand ideally extracted with computationally low-demanding routines. For the traveling salesperson problem (TSP) a plethora of features have been suggested. Most of these features are, if at all, only normalized imprecisely raising the issue of feature values being strongly affected by the instance size. Such artifacts may have detrimental effects on algorithm selection models. We propose a normalization for two feature groups which stood out in multiple AS studies on the TSP: (a) features based on a minimum spanning tree (MST) and (b) nearest neighbor relationships of the input instance. To this end we theoretically derive minimum and maximum values for properties of MSTs and k-nearest neighbor graphs (NNG) of Euclidean graphs. We analyze the differences in feature space between normalized versions of these features and their unnormalized counterparts. Our empirical investigations on various TSP benchmark sets point out that the feature scaling succeeds in eliminating the effect of the instance size. A proof-of-concept AS-study shows promising results: models trained with normalized features tend to outperform those trained with the respective vanilla features.
AU - Heins, Jonathan
AU - Bossek, Jakob
AU - Pohl, Janina
AU - Seiler, Moritz
AU - Trautmann, Heike
AU - Kerschke, Pascal
ID - 46310
JF - Theoretical Computer Science
KW - Feature normalization
KW - Algorithm selection
KW - Traveling salesperson problem
SN - 0304-3975
TI - A study on the effects of normalized TSP features for automated algorithm selection
VL - 940
ER -
TY - JOUR
AB - We present a fully integrated radio frequency identifications transponder chip operating at 5.8 GHz, which is compatible with the class-1 generation-2 of the Electronic Product Code protocol (EPC-C1 G2). The tag chip including the analog front-end and the digital baseband processor, are designed in the sub-threshold regime (0.5 V) with a total supply current of less than 50 μA. As a power scavenging unit, a single-stage differential-drive rectifier structure is designed and fabricated with standard threshold voltage (SVT) MOS elements in a commercial 65-nm CMOS process, to provide 0.8 V of rectified voltage. Measurements performed on the fabricated single-stage structure show a maximum power conversion efficiency of 69.6% for a 22 kΩ load and a sensitivity of -12.5 dBm, which corresponds to more than 1 m of reading range. The power conversion efficiency at this range is about 64%.
AU - Haddadian, Sanaz
AU - Scheytt, J. Christoph
AU - von Bögel, Gerd
AU - Grenter, Thorben
ID - 47009
JF - IEEE Journal of Radio Frequency Identification
TI - A Sub-Threshold Microwave RFID Tag Chip, Compatible With RFID MIMO Reader Technology
ER -
TY - JOUR
AU - Cieply, Jonas
AU - Disselkamp, Jan-Philipp
AU - Dyck, Florian
AU - Alturk, Waddah
AU - Kühn, Arno
AU - Dumitrescu, Roman
ID - 47803
JF - Procedia CIRP
KW - General Medicine
SN - 2212-8271
TI - A systematic literature review on the Digital Twin of the factory in the context of the product and factory lifecycle
VL - 119
ER -
TY - CONF
AU - Cord-Landwehr, Tobias
AU - Boeddeker, Christoph
AU - Zorilă, Cătălin
AU - Doddipatla, Rama
AU - Haeb-Umbach, Reinhold
ID - 47129
T2 - INTERSPEECH 2023
TI - A Teacher-Student Approach for Extracting Informative Speaker Embeddings From Speech Mixtures
ER -
TY - CONF
AU - Ellermann, Kai
AU - Asmar, Laban
AU - Dumitrescu, Roman
ID - 47807
T2 - ISPIM Conference Proceedings
TI - A Technology Foresight Maturity Model
ER -
TY - JOUR
AU - Westermann, Hendrik
AU - Mahnken, Rolf
ID - 44891
IS - 1
JF - PAMM
KW - Electrical and Electronic Engineering
KW - Atomic and Molecular Physics
KW - and Optics
SN - 1617-7061
TI - A thermodynamic framework for the phase‐field approach considering carbide precipitation during phase transformations
VL - 22
ER -
TY - CONF
AU - Castenow, Jannik
AU - Harbig, Jonas
AU - Jung, Daniel
AU - Kling, Peter
AU - Knollmann, Till
AU - Meyer auf der Heide, Friedhelm
ED - Hillel, Eshcar
ED - Palmieri, Roberto
ED - Riviére, Etienne
ID - 34008
SN - 1868-8969
T2 - Proceedings of the 26th International Conference on Principles of Distributed Systems (OPODIS)
TI - A Unifying Approach to Efficient (Near-)Gathering of Disoriented Robots with Limited Visibility
VL - 253
ER -
TY - JOUR
AB - The aim of the present study is to prove the construct validity of the German versions of the Feeling Scale (FS) and the Felt Arousal Scale (FAS) for a progressive muscle relaxation (PMR) exercise. A total of 228 sport science students conducted the PMR exercise for 45 min and completed the FS, the FAS, and the Self-Assessment Manikin (SAM) in a pre-test–post-test design. A significant decrease in arousal (t(227) = 8.296, p < 0.001) and a significant increase in pleasure (t(227) = 4.748, p < 0.001) were observed. For convergent validity, the correlations between the FS and the subscale SAM-P for the valence dimension (r = 0.67, p < 0.001) and between the FAS and the subscale SAM-A for the arousal dimension (r = 0.31, p < 0.001) were significant. For discriminant validity, the correlations between different constructs (FS and SAM-A, FAS and SAM-P) were not significant, whereas the discriminant analysis between the FS and the FAS revealed a negative significant correlation (r = −0.15, p < 0.001). Together, the pattern of results confirms the use of the German versions of the FS and the FAS to measure the affective response for a PMR exercise.
AU - Thorenz, Kristin
AU - Berwinkel, Andre
AU - Weigelt, Matthias
ID - 45857
IS - 7
JF - Behavioral Sciences
KW - Behavioral Neuroscience
KW - General Psychology
KW - Genetics
KW - Development
KW - Ecology
KW - Evolution
KW - Behavior and Systematics
SN - 2076-328X
TI - A Validation Study for the German Versions of the Feeling Scale and the Felt Arousal Scale for a Progressive Muscle Relaxation Exercise
VL - 13
ER -
TY - JOUR
AU - Thorenz, Kristin
AU - Berwinkel, Andre
AU - Weigelt, Matthias
ID - 45856
IS - 06
JF - Psychology
KW - General Earth and Planetary Sciences
KW - General Environmental Science
SN - 2152-7180
TI - A Validation Study of the German Versions of the Feeling Scale and the Felt Arousal Scale for a Passive Relaxation Technique (Autogenic Training)
VL - 14
ER -
TY - CONF
AU - Herbert, Franziska
AU - Becker, Steffen
AU - Schaewitz, Leonie
AU - Hielscher, Jonas
AU - Kowalewski, Marvin
AU - Sasse, M. Angela
AU - Acar, Yasemin
AU - Dürmuth, Markus
ED - Schmidt, Albrecht
ED - Väänänen, Kaisa
ED - Goyal, Tesh
ED - Kristensson, Per Ola
ED - Peters, Anicia
ED - Mueller, Stefanie
ED - Williamson, Julie R.
ED - Wilson, Max L.
ID - 47306
T2 - Proceedings of the 2023 CHI Conference on Human Factors in Computing Systems, CHI 2023, Hamburg, Germany, April 23-28, 2023
TI - A World Full of Privacy and Security (Mis)conceptions? Findings of a Representative Survey in 12 Countries
ER -
TY - JOUR
AU - Jacke, Christoph
ID - 48418
IS - 6
JF - Impulse. Texte und Bilder zur Kunstvermittlung.
TI - ABHÄNGEN - Ein- und Ausgrenzen, Kanonisieren, Kollaborieren in Pop, Kunst und Medien.
ER -
TY - JOUR
AU - Jacke, Christoph
ID - 48266
IS - 6
JF - Impulse. Texte und Bilder zur Kunstvermittlung.
TI - Abhängenwerden. Fühlen und Denken.
ER -
TY - CONF
AU - Neumayr, Thomas
AU - Yigitbas, Enes
AU - Augstein, Mirjam
AU - Herder, Eelco
ID - 47055
T2 - Proceedings of the Mensch & Computer (2023)
TI - ABIS 2023 – 27th International Workshop on Personalization and Recommendation
ER -
TY - GEN
AU - Krimphove, Dieter
ID - 36433
T2 - Manz Online
TI - Abkommen der EU
ER -
TY - CONF
AU - Ewenz, Lars
AU - Kuczyk, Martin
AU - Schöne, S.
AU - Zimmermann, Martina
ED - Zimmermann, Martina
ID - 38511
T2 - Tagung Werkstoffprüfung 2022
TI - Ableitung flacher Probengeometrien zur Abbildung mehraxialer Spannungszustände in Clinchverbindungen unter zyklischer Beanspruchung
ER -
TY - GEN
AU - Gerick, J.
AU - Eickelmann, Birgit
AU - Panten, B.
AU - Rothärmel, A.
AU - Rau, M.
AU - Gottschalk, T.
ID - 44627
TI - Abschlussbericht zum Forschungsprojekt ‚Gelingensbedingungen und Transfer von erfolgreichen Digitalisierungsprozessen an Schulen in Nordrhein-Westfalen (GuTe DigiSchulen NRW)
ER -
TY - JOUR
AB - Given a geometrically finite hyperbolic surface of infinite volume it is a
classical result of Patterson that the positive Laplace-Beltrami operator has
no $L^2$-eigenvalues $\geq 1/4$. In this article we prove a generalization of
this result for the joint $L^2$-eigenvalues of the algebra of commuting
differential operators on Riemannian locally symmetric spaces $\Gamma\backslash
G/K$ of higher rank. We derive dynamical assumptions on the $\Gamma$-action on
the geodesic and the Satake compactifications which imply the absence of the
corresponding principal eigenvalues. A large class of examples fulfilling these
assumptions are the non-compact quotients by Anosov subgroups.
AU - Weich, Tobias
AU - Wolf, Lasse Lennart
ID - 31189
JF - Communications in Mathematical Physics
TI - Absence of principal eigenvalues for higher rank locally symmetric spaces
VL - 403
ER -
TY - GEN
ED - Haekel, Ralf
ED - Butter, Stella
ED - Mildorf, Jarmila
ID - 49717
IS - 4
SN - 0340-5222
T2 - Anglia
TI - Abstract Reflection in Contemporary Fiction
VL - 141
ER -
TY - GEN
AU - Vernholz, Mats
ED - Perla, Loredana
ED - Agrati, Laura Sara
ED - Vinci, Viviana
ED - Scarinci, Alessia
ID - 52370
SN - 9791255681038
T2 - Living and Leading in the Next Era: Connecting Teaching, Research, Citizenship and Equity
TI - Academic self-concepts of pre-service technology teachers for vocational education in Germany according to the TPACK- Model
ER -
TY - CONF
AU - Baci, Alkid
AU - Heindorf, Stefan
ID - 46575
T2 - CIKM
TI - Accelerating Concept Learning via Sampling
ER -
TY - GEN
AB - The prediction of photon echoes is an important technique for gaining an understanding of optical quantum systems. However, this requires a large number of simulations with varying parameters and/or input pulses, which renders numerical studies expensive. This article investigates how we can use data-driven surrogate models based on the Koopman operator to accelerate this process. In order to be successful, we require a model that is accurate over a large number of time steps. To this end, we employ a bilinear Koopman model using extended dynamic mode decomposition and simulate the optical Bloch equations for an ensemble of inhomogeneously broadened two-level systems. Such systems are well suited to describe the excitation of excitonic resonances in semiconductor nanostructures, for example, ensembles of semiconductor quantum dots. We perform a detailed study on the required number of system simulations such that the resulting data-driven Koopman model is sufficiently accurate for a wide range of parameter settings. We analyze the L2 error and the relative error of the photon echo peak and investigate how the control positions relate to the stabilization. After proper training, the dynamics of the quantum ensemble can be predicted accurately and numerically very efficiently by our methods.
AU - Peitz, Sebastian
AU - Hunstig, Anna
AU - Rose, Hendrik
AU - Meier, Torsten
ID - 48502
TI - Accelerating the analysis of optical quantum systems using the Koopman operator
ER -
TY - CONF
AU - Vogelsang, Christoph
AU - Meier, Jana
AU - Janzen, Thomas
AU - Wotschel, Philipp
ID - 47066
TI - Acceptance of simulation-based assessment formats in teacher education.
ER -
TY - BOOK
AB - Das Werkverzeichnis des Düsseldorfer Malers, Fotografen und Objektkünstlers Achim Duchow (1948 – 1993) lädt ein zur Wiederentdeckung eines komplexen OEuvres. Im spielerischen Umgang mit Autorschaft, Subjektivität und Medien, dem unmittelbaren Zugriff auf alle ihn bewegenden Themen ist ein Werk entstanden, das auch heute noch seine Wirkung entfaltet. In chronologischer Folge, unterbrochen von einzelnen Essays verzeichnet die Publikation als eine über 400-seitige
Liste alle Phasen des Werks: Duchows Zusammenarbeit mit Sigmar Polke in den 1970er Jahren, seinen zweieinhalbjährigen Aufenthalt in Japan, seine Rückkehr 1981 in eine Kunstszene, die sich rasant in Richtung Marktgängigkeit verändert hatte, seine Arbeit an einem neuen Selbstverständnis als Künstler und Kulturarbeiter, seine malerische Auseinandersetzung mit deutscher Geschichte und Politik, mit Kolonialismus und Wiedervereinigung, aber auch mit dem Informel und dem Konstruktivismus. Das Werkverzeichnis katalogisiert alle auffindbaren Arbeiten sowie Texte von Duchow selbst. Weggefährt·innen und Historiker·innen geben einen Einblick in den radikalen Kontext seines Lebens.
ED - Schulze, Max
ID - 48937
KW - Malerei
KW - Medienkunst
KW - Fotografie
KW - Düsseldorf
KW - Hamburg
KW - Japan
KW - Bad Painting
KW - Popart
KW - Montage
SN - 978-3-95905-726-4
TI - Achim Duchow: Blindes Vertrauen / Werkverzeichnis 1971–1993
ER -
TY - GEN
AU - Krimphove, Dieter
ID - 36434
T2 - Manz Online
TI - Acquis communautaire
ER -
TY - JOUR
AU - Güldenpenning, Iris
AU - Jackson, Robin C.
AU - Weigelt, Matthias
ID - 49515
JF - Psychology of Sport and Exercise
KW - Applied Psychology
SN - 1469-0292
TI - Action outcome probability influences the size of the head-fake effect in basketball
VL - 68
ER -
TY - GEN
AU - Güldenpenning, Iris
AU - Böer, Nils Tobias
AU - Kunde, Wilfried
AU - Weigelt, Matthias
ED - Merz, Simon
ED - Frings, Christian
ED - Leuchtenberg, Bettina
ED - Moeller, Birte
ED - Mueller, Stefanie
ED - Neumann, Roland
ED - Pastötter, Bernhard
ED - Pingen, Leah
ED - Schui, Gabriel
ID - 45825
T2 - Abstracts of the 65th Conference of experimental Psychologists (TeaP)
TI - Adaptation to context information for head fakes in basketball
ER -
TY - JOUR
AU - Junker, Annika
AU - Pape, Keno Egon Friedrich
AU - Timmermann, Julia
AU - Trächtler, Ansgar
ID - 50070
IS - 3
JF - IFAC-PapersOnLine
KW - General Medicine
SN - 2405-8963
TI - Adaptive Koopman-Based Models for Holistic Controller and Observer Design
VL - 56
ER -
TY - JOUR
AB - AbstractCurrently, the fused deposition modeling (FDM) process is the most common additive manufacturing technology. The principle of the FDM process is the strand wise deposition of molten thermoplastic polymers, by feeding a filament trough a heated nozzle. Due to the strand and layer wise deposition the cooling of the manufactured component is not uniform. This leads to dimensional deviations which may cause the component to be unusable for the desired application. In this paper, a method is described which is based on the shrinkage compensation through the adaption of every single raster line in components manufactured with the FDM process. The shrinkage compensation is based on a model resulting from a DOE which considers the main influencing factors on the shrinkage behavior of raster lines in the FDM process. An in‐house developed software analyzes the component and locally applies the shrinkage compensation with consideration of the boundary conditions, e.g., the position of the raster line in the component and the process parameters. Following, a validation using a simple geometry is conducted to show the effect of the presented adaptive scaling method.
AU - Moritzer, Elmar
AU - Hecker, Felix
ID - 48277
IS - 1
JF - Macromolecular Symposia
KW - Materials Chemistry
KW - Polymers and Plastics
KW - Organic Chemistry
KW - Condensed Matter Physics
SN - 1022-1360
TI - Adaptive Scaling of Components in the Fused Deposition Modeling Process
VL - 411
ER -
TY - JOUR
AB - AbstractCurrently, the fused deposition modeling (FDM) process is the most common additive manufacturing technology. The principle of the FDM process is the strand wise deposition of molten thermoplastic polymers, by feeding a filament trough a heated nozzle. Due to the strand and layer wise deposition the cooling of the manufactured component is not uniform. This leads to dimensional deviations which may cause the component to be unusable for the desired application. In this paper, a method is described which is based on the shrinkage compensation through the adaption of every single raster line in components manufactured with the FDM process. The shrinkage compensation is based on a model resulting from a DOE which considers the main influencing factors on the shrinkage behavior of raster lines in the FDM process. An in‐house developed software analyzes the component and locally applies the shrinkage compensation with consideration of the boundary conditions, e.g., the position of the raster line in the component and the process parameters. Following, a validation using a simple geometry is conducted to show the effect of the presented adaptive scaling method.
AU - Moritzer, Elmar
AU - Hecker, Felix
ID - 52802
IS - 1
JF - Macromolecular Symposia
KW - Materials Chemistry
KW - Polymers and Plastics
KW - Organic Chemistry
KW - Condensed Matter Physics
SN - 1022-1360
TI - Adaptive Scaling of Components in the Fused Deposition Modeling Process
VL - 411
ER -
TY - CONF
AB - In XAI it is important to consider that, in contrast to explanations for professional audiences, one cannot assume common expertise when explaining for laypeople. But such explanations between humans vary greatly, making it difficult to research commonalities across explanations. We used the dual nature theory, a techno-philosophical approach, to cope with these challenges. According to it, one can explain, for example, an XAI's decision by addressing its dual nature: by focusing on the Architecture (e.g., the logic of its algorithms) or the Relevance (e.g., the severity of a decision, the implications of a recommendation). We investigated 20 game explanations using the theory as an analytical framework. We elaborate how we used the theory to quickly structure and compare explanations of technological artifacts. We supplemented results from analyzing the explanation contents with results from a video recall to explore how explainers justified their explanation. We found that explainers were focusing on the physical aspects of the game first (Architecture) and only later on aspects of the Relevance. Reasoning in the video recalls indicated that EX regarded the focus on the Architecture as important for structuring the explanation initially by explaining the basic components before focusing on more complex, intangible aspects. Shifting between addressing the two sides was justified by explanation goals, emerging misunderstandings, and the knowledge needs of the explainee. We discovered several commonalities that inspire future research questions which, if further generalizable, provide first ideas for the construction of synthetic explanations.
AU - Terfloth, Lutz
AU - Schaffer, Michael
AU - Buhl, Heike M.
AU - Schulte, Carsten
ID - 47448
SN - 978-3-031-44069-4
TI - Adding Why to What? Analyses of an Everyday Explanation
ER -
TY - JOUR
AU - Graf, Lara Marie
AU - Wienhues, Inga
AU - Häsel-Weide, Uta
ID - 45713
IS - 339
JF - Die Grundschulzeitschrift
TI - Addition und Subtraktion verstehen
ER -
TY - JOUR
AB - The effect of plaque deposition (atherosclerosis) on blood flow behaviour is investigated via computational fluid dynamics and structural mechanics simulations. To mitigate the narrowing of coronary artery atherosclerosis (stenosis), the computational modelling of auxetic and non-auxetic stents was performed in this study to minimise or even avoid these deposition agents in the future. Computational modelling was performed in unrestricted (open) conditions and restricted (in an artery) conditions. Finally, stent designs were produced by additive manufacturing, and mechanical testing of the stents was undertaken. Auxetic stent 1 and auxetic stent 2 exhibit very little foreshortening and radial recoil in unrestricted deployment conditions compared to non-auxetic stent 3. However, stent 2 shows structural instability (strut failure) during unrestricted deployment conditions. For the restricted deployment condition, stent 1 shows a higher radial recoil compared to stent 3. In the tensile test simulations, short elongation for stent 1 due to strut failure is demonstrated, whereas no structural instability is noticed for stent 2 and stent 3 until 0.5 (mm/mm) strain. The as-built samples show a significant thickening of the struts of the stents resulting in short elongations during tensile testing compared to the simulations (stent 2 and stent 3). A modelling framework for the stent deployment system that enables the selection of appropriate stent designs before in vivo testing is required. This leads to the acceleration of the development process and a reduction in time, resulting in less material wastage. The modelling framework shall be useful for doctors designing patient-specific stents.
AU - Pramanik, Sudipta
AU - Milaege, Dennis
AU - Hein, Maxwell
AU - Hoyer, Kay-Peter
AU - Schaper, Mirko
ID - 49107
IS - 11
JF - Crystals
KW - Inorganic Chemistry
KW - Condensed Matter Physics
KW - General Materials Science
KW - General Chemical Engineering
SN - 2073-4352
TI - Additive Manufacturing and Mechanical Properties of Auxetic and Non-Auxetic Ti24Nb4Zr8Sn Biomedical Stents: A Combined Experimental and Computational Modelling Approach
VL - 13
ER -
TY - CONF
AU - Bieber, Maximilian
AU - Haase, Michael
AU - Tasche, Frederik
AU - Zibart, Alexander
AU - Ponick, Bernd
ID - 49774
T2 - 2023 IEEE International Electric Machines & Drives Conference (IEMDC)
TI - Additively manufactured air-cooled lightweight rotor for an automotive electric motor
ER -
TY - CONF
AU - Franke, Mario
AU - Klingler, Florian
AU - Sommer, Christoph
ID - 34880
T2 - IEEE Consumer Communications and Networking Conference (CCNC 2023), Track Communication and Applications for Connected and Autonomous Vehicles on Land, Water, and Sky
TI - Addressing the Unbounded Latency of Best-Effort Device-to-Device Communication with Low Earth Orbit Satellite Support
ER -
TY - JOUR
AU - Wu, Shuang
AU - Delp, Alexander
AU - Freund, Jonathan
AU - Walther, Frank
AU - Haubrich, Jan
AU - Löbbecke, Miriam
AU - Tröster, Thomas
ID - 46495
JF - The Journal of Adhesion
KW - Materials Chemistry
KW - Surfaces
KW - Coatings and Films
KW - Surfaces and Interfaces
KW - Mechanics of Materials
KW - General Chemistry
SN - 0021-8464
TI - Adhesion properties of the hybrid system made of laser-structured aluminium EN AW 6082 and CFRP by co-bonding-pressing process
ER -
TY - CHAP
AU - Fuchs, Christian
ED - Popp, Judith-Frederike
ED - Voropai, Lioudmila
ID - 38150
T2 - Adorno und die Medien: Kritik, Relevanz, Ethik
TI - Adorno and the Media in Digital Capitalism
ER -
TY - JOUR
AB - The influence of nanoscale surface topography on protein adsorption is highly important for numerous applications in medicine and technology. Herein, ferritin adsorption at flat and nanofaceted, single-crystalline Al2O3 surfaces is investigated using atomic force microscopy and X-ray photoelectron spectroscopy. The nanofaceted surfaces are generated by the thermal annealing of Al2O3 wafers at temperatures above 1000 °C, which leads to the formation of faceted saw-tooth-like surface topographies with periodicities of about 160 nm and amplitudes of about 15 nm. Ferritin adsorption at these nanofaceted surfaces is notably suppressed compared to the flat surface at a concentration of 10 mg/mL, which is attributed to lower adsorption affinities of the newly formed facets. Consequently, adsorption is restricted mostly to the pattern grooves, where the proteins can maximize their contact area with the surface. However, this effect depends on the protein concentration, with an inverse trend being observed at 30 mg/mL. Furthermore, different ferritin adsorption behavior is observed at topographically similar nanofacet patterns fabricated at different annealing temperatures and attributed to different step and kink densities. These results demonstrate that while protein adsorption at solid surfaces can be notably affected by nanofacet patterns, fine-tuning protein adsorption in this way requires the precise control of facet properties.
AU - Pothineni, Bhanu K.
AU - Kollmann, Sabrina
AU - Li, Xinyang
AU - Grundmeier, Guido
AU - Erb, Denise J.
AU - Keller, Adrian
ID - 46543
IS - 16
JF - International Journal of Molecular Sciences
KW - Inorganic Chemistry
KW - Organic Chemistry
KW - Physical and Theoretical Chemistry
KW - Computer Science Applications
KW - Spectroscopy
KW - Molecular Biology
KW - General Medicine
KW - Catalysis
SN - 1422-0067
TI - Adsorption of Ferritin at Nanofaceted Al2O3 Surfaces
VL - 24
ER -
TY - THES
AU - Tornede, Alexander
ID - 45780
TI - Advanced Algorithm Selection with Machine Learning: Handling Large Algorithm Sets, Learning From Censored Data, and Simplyfing Meta Level Decisions
ER -
TY - CONF
AB - State-of-the-art LLC resonant converters use MOSFETs in their inverter stage, which allows high switching frequencies and thus the use of compact magnetic components. The large parasitic output capacitance and the poor reverse-recovery behaviour of the inherent body diode of high-voltage (600 V) silicon MOSFETs require soft switching, i.e. zero-voltage switching (ZVS). Otherwise, the high turn-on switching losses would lead to excessive heating and ultimately to the destruction of the switch. Therefore, MOSFET-based LLC converters are operated in the so-called inductive region only, which enables ZVS. The use of robust and cost-effective IGBTs instead of MOSFETs is particularly advantageous for automotive applications, since in addition to high reliability low costs are an important objective here. Since IGBTs are characterized by dominant turn-off losses and generally higher switching losses compared to MOSFETs, the aim is to operate them with zero-current switching (ZCS) and at low switching frequencies below the resonance frequency. In this region also the voltage transfer characteristic is steeper, which qualifies for applications with a strongly varying input-to-output voltage ratio, such as given for automotive on-board DC-DC converters connecting the (high-voltage) traction battery with the (12 V) auxiliary battery. In this paper, a stress value analysis based on a switched-model simulation is used to design a ZCS LLC converter and take advantage of the mentioned benefits of IGBTs as well as of the steeper voltage transfer characteristic. Within this operation region below the resonance frequency, however, a new phenomenon of several current pulses occurring during a single switching period through the rectifier components may appear. Generally, in applications with high output currents a synchronous rectifier (SR) is often used to keep the conduction losses of the rectifier stage at a moderate level: Low-voltage MOSFETs, which actively need to be gated synchronously to the polarity of the current pulses, are employed then instead of more lossy rectifier diodes. However, standard SR driver ICs have been shown to be unable to properly rectify the multi-pulse output currents of the proposed LLC operation, resulting in high conduction losses of the rectifier stage. A cost-effective hardware concept is presented which ensures proper rectification by using standard SR-ICs that are actively overdriven by the converter’s central microcontroller. A 2 kW prototype for an EV on-board DC-DC converter was built to show the effectiveness of the method, documenting an increase in efficiency by up to 4.1 % compared to a purely SR-IC-based solution. Overall efficiency is very similar to that of a conventional (MOSFET-based) LLC converter so that the ZCS-operated LLC IGBT-converter represents a cost-effective alternative, which even shows 10 % less worst-case losses.
AU - Urbaneck, Daniel
AU - Schafmeister, Frank
AU - Böcker, Joachim
ID - 46269
KW - LLC Converter
KW - IGBT
KW - ZCS
KW - Synchronous Rectification
T2 - PCIM Europe 2023
TI - Advanced Synchronous Rectification for an IGBT-Based ZCS LLC Converter with High Output Currents for a 2 kW Automotive DC-DC Stage
ER -
TY - THES
AB - The importance of fiber-reinforced plastics for lightweight construction applications is steadily increasing due to their outstanding weight-specific property values. However, a decisive disadvantage of these composite materials has so far been the high material and process costs, which is why fiber-reinforced plastics are almost exclusively used in small to medium-sized series. Optimization of manufacturing methods is of great importance to reduce the production cost. In this study, two concepts are proposed that can optimize vacuum assisted light resin transfer molding (VA-LRTM) further, leading to a possibility of fully automatic process. Conventional VA-LRTM methods are used to produce complex fiber-reinforced plastics (FRP) and hybrid components. Traditional molds used to produce components via VA-LRTM are sealed using polymer materials to prevent the leakage of matrix system. The seals undergo tremendous amounts of thermal, chemical, and mechanical loadings. Thus, sealings must be replaced in short intervals. In the current study, a concept where sealing is achieved by accelerating the curing of matrix system itself with the help of heating elements and catalysts resulting in a self-sealing approach is proposed. Another concern is mold surface contamination during component production. To address this, a modified automatic cleaning technique based on ultrasonic cleaning was proposed which can be integrated into the production line with minimum modification. Both the proposed concepts were validated and optimized using experiments, simulations, and analytical approaches by producing metal-FRP hybrid shafts.
AU - Chalicheemalapalli Jayasankar, Deviprasad
ID - 50449
KW - fiber-reinforced plastics
KW - resin transfer molding
KW - composites
TI - Advances In RTM Manufacturing Of Metal-FRP Hybrids By Self-Sealing And In-Mold Cleaning Techniques
ER -
TY - GEN
AU - Krimphove, Dieter
ID - 36435
T2 - Manz Online
TI - AEUV
ER -
TY - JOUR
AB - This research aimed to understand the role of after-school sports programs in social inclusion processes in culturally diverse contexts through a multicase study within two locations. The first location was in Spain where immigrant and Spanish students were enrolled, and the other was in Chile with Mapuche-Huilliche students, immigrant and Chilean students. The implemented programs at both sites were similar in their educational focus on socio-educational values, and teaching models (hybridization of teaching games for understanding and cooperative learning) that enhance social inclusion. Using individual and group interviews with teachers, sports coordinators, parents, and students, a qualitative approach was used to identify the factors that facilitate or hinder the social inclusion processes. In addition, the researchers used qualitative observations of the programs over six months using “notes logbook” to record their impressions during the observation process. Results indicated that the implemented sports programs successfully facilitated social inclusion processes, enabling the development of interpersonal skills and relationships between students from different cultural backgrounds. The previous training and experiences of teachers in culturally diverse contexts, and incorporation of traditional sporting games from all cultures, seems to be an important facilitator factor for the inclusion potential of the implemented programs.
AU - Carter-Thuillier, Bastian
AU - López-Pastor, Víctor
AU - Gallardo-Fuentes, Francisco
AU - Carter-Beltran, Juan
AU - Fernández-Balboa, Juan-Miguel
AU - Delgado-Floody, Pedro
AU - Grimminger-Seidensticker, Elke
AU - Sortwell, Andrew
ID - 49899
JF - Frontiers in Psychology
KW - General Psychology
SN - 1664-1078
TI - After-school sports programmes and social inclusion processes in culturally diverse contexts: Results of an international multicase study
VL - 14
ER -
TY - JOUR
AB - Mathematical models and computer simulations play a crucial role in the context of the COVID-19 crisis for knowledge about the possible course of the pandemic and for appropriate policy decisions. The paper presents results from an ethnographic study of a government-funded R & D project dealing with agent-based modeling and simulation (ABMS) in the context of pandemic management. Based on the assumption that the use of computer simulations in pandemic management is not only a means to an end for political or epidemiological goals but also plays a significant role in determining which goals and strategies appear politically legitimate, the paper reconstructs how insights into the pandemic are generated in ABMS and specifically in the researched project and made accessible for decision-making.
AU - Hälterlein, Jens
ID - 50603
IS - 1
JF - TATuP - Zeitschrift für Technikfolgenabschätzung in Theorie und Praxis
KW - General Medicine
SN - 2567-8833
TI - Agentenbasierte Modellierung und Simulation im Pandemiemanagement
VL - 32
ER -
TY - JOUR
AU - Kornowicz, Jaroslaw
AU - Thommes, Kirsten
ID - 47953
JF - Artificial Intelligence in HCI
SN - 0302-9743
TI - Aggregating Human Domain Knowledge for Feature Ranking
ER -