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 -