TY - CHAP
AU - Strauß, Sara
ED - Mildorf, Jarmila
ED - Punzi, Eilsabeth
ED - Singer, Christoph
ID - 43459
SN - 9780197620540
T2 - Narrative and Mental Health
TI - Narrative Experiments with Medical Categorization and Normalization in B. S. Johnson's House Mother Normal
ER -
TY - GEN
AU - Dechert, Christopher
AU - Kengni Nkouemou, Augustin
AU - Kenig, Eugeny Y.
ID - 43111
TI - Vergleichende Untersuchung der Wirkung verschiedener Mikrostrukturen auf die Flüssigkeitsausbreitung
ER -
TY - JOUR
AB - High-contrast slab waveguide Bragg gratings with 1D periodicity are investigated. For specific oblique excitation by semi-guided waves at sufficiently high angles of incidence, the idealized structures do not exhibit any radiative losses, such that reflectance and transmittance for the single port mode add strictly up to one. We consider a series of symmetric, fully and partly etched finite gratings, for parameters found in integrated silicon photonics. These can act as spectral filters with a reasonably flattop response. Apodization can lead to more box shaped reflectance and transmittance spectra. Together with a narrowband Fabry–Perot filter, these configurations are characterized by reflection bands, or transmittance peaks, with widths that span three orders of magnitude.
AU - Hammer, Manfred
AU - Farheen, Henna
AU - Förstner, Jens
ID - 43245
IS - 4
JF - Journal of the Optical Society of America B
KW - tet_topic_waveguide
SN - 0740-3224
TI - How to suppress radiative losses in high-contrast integrated Bragg gratings
VL - 40
ER -
TY - JOUR
AU - Serino, Laura
AU - Gil López, Jano
AU - Stefszky, Michael
AU - Ricken, Raimund
AU - Eigner, Christof
AU - Brecht, Benjamin
AU - Silberhorn, Christine
ID - 44081
IS - 2
JF - PRX Quantum
KW - General Physics and Astronomy
KW - Mathematical Physics
KW - Applied Mathematics
KW - Electronic
KW - Optical and Magnetic Materials
KW - Electrical and Electronic Engineering
KW - General Computer Science
SN - 2691-3399
TI - Realization of a Multi-Output Quantum Pulse Gate for Decoding High-Dimensional Temporal Modes of Single-Photon States
VL - 4
ER -
TY - BOOK
AU - Ribbat, Christoph
ID - 44080
TI - Breathing in Manhattan: Carola Speads - The German Jewish Gymnastics Instructor Who Brought Mindfulness to America
ER -
TY - CONF
AB - The nonlinear optical response of quantum well excitons is investigated experimentally using polarization resolved four wave mixing, optical-pump optical-probe, and optical-pump Terahertz-probe spectroscopy. The four-wave mixing data reveal clear signatures of coherent biexcitons which concur with straight-forward polarization selection rules at the Γ point. The type-I samples show the well-established time-domain beating signatures in the transients as well as the corresponding spectral signatures clearly. The latter are also present in type-II samples; however, the smaller exciton and biexciton binding energies in these structures infer longer beating times which, in turn, are accompanied by faster dephasing of the type-II exciton coherences. Furthermore, the THz absorption following spectrally narrow, picosecond excitation at energies in the vicinity of the 1s exciton resonance are discussed. Here, the optical signatures yield the well-established redshifts and blueshifts for the appropriate polarization geometries in type-I quantum well samples also termed “AC Stark Effect”. The THz probe reveals intriguing spectral features which can be ascribed to coherent negative absorption following an excitation into a virtual state for an excitation below the 1s exciton resonance. Furthermore, the scattering and ionization of excitons is discussed for several excitation geometries yielding control rules for elastic and inelastic quasiparticle collisions.
AU - Meier, Torsten
AU - Stein, M.
AU - Schäfer, F.
AU - Anders, D.
AU - Littmann, J. H.
AU - Fey, M.
AU - Trautmann, Alexander
AU - Ngo, C.
AU - Steiner, J. T.
AU - Reichelt, Matthias
AU - Fuchs, C.
AU - Volz, K.
AU - Chatterjee, S.
ID - 43189
T2 - Ultrafast Phenomena and Nanophotonics XXVII
TI - Experimental studies of the excitonic nonlinear response of GaAs-based type-I and type-II quantum well structures interacting with optical and terahertz fields
VL - 12419
ER -
TY - CONF
AB - Anomalous currents refer to electronic currents that flow perpendicularly to the direction of the accelerating electric field. Such anomalous currents can be generated when Terahertz fields are applied after an optical interband excitation of GaAs quantum wells. The underlying processes are investigated by numerical solutions of the semiconductor Bloch equations in the length gauge. Excitonic effects are included by treating the manybody Coulomb interaction in time-dependent Hartree-Fock approximation and additionally also carrier-phonon scattering processes are considered. The band structure and matrix elements are obtained from a 14-band k · p model within the envelope function approximation. The random phase factors of the matrix elements that appear due to the separate numerical diagonalization at each k-point are treated by applying a smooth gauge transformation. We present the macroscopic Berry curvature and anomalous current transients with and without excitonic effects. It is demonstrated that the resonant optical excitation of excitonic resonances can significantly enhance the Berry curvature and the anomalous currents.
AU - Meier, Torsten
AU - Ngo, C.
AU - Priyadarshi, S.
AU - Duc, H. T.
AU - Bieler, M.
ID - 43191
T2 - Ultrafast Phenomena and Nanophotonics XXVII
TI - Terahertz-induced anomalous currents following the optical excitation of excitons in semiconductor quantum wells
VL - 12419
ER -
TY - CONF
AB - The nonlinear optical response of quantum well excitons excited by optical fields is analyzed by numerical solutions of the semiconductor Bloch equations. Differential absorption spectra are computed for resonant pumping at the exciton resonance and the dependence of the absorption changes on the polarization directions of the pump and probe pulses is investigated. Coherent biexcitonic many-body correlations are included in our approach up to third-order in the optical fields. Results are presented for spatially-direct type-I and spatiallyindirect type-II quantum well systems. Due to the spatial inhomogeneity, in type-II structures a finite coupling between excitons of opposite spins exists already on the Hartree-Fock level and contributes to the absorption changes for the case of opposite circularly polarized pump and probe pulses.
AU - Meier, Torsten
AU - Trautmann, Alexander
AU - Stein, M.
AU - Schäfer, F.
AU - Anders, D.
AU - Ngo, C.
AU - Steiner, J. T.
AU - Reichelt, Matthias
AU - Chatterjee, S.
ID - 43190
T2 - Ultrafast Phenomena and Nanophotonics XXVII
TI - Analysis of the nonlinear optical response of excitons in type-I and type-II quantum wells including many-body correlations
VL - 12419
ER -
TY - JOUR
AU - Meier, Torsten
AU - Schäfer, F.
AU - Stein, M.
AU - Lorenz, J.
AU - Dobener, F.
AU - Ngo, C.
AU - Steiner, J. T.
AU - Fuchs, C.
AU - Stolz, W.
AU - Volz, K.
AU - Hader, J.
AU - Moloney, J.V.
AU - Koch, S.W.
AU - Chatterjee, S.
ID - 43139
IS - 8
JF - Applied Physics Letters
TI - Gain recovery dynamics in active type-II semiconductor heterostructures
VL - 122
ER -
TY - GEN
AU - Meier, Torsten
AU - Grisard, S.
AU - Trifonov, A.V.
AU - Rose, Hendrik
AU - Reichhardt, R.
AU - Reichelt, Matthias
AU - Schneider, C.
AU - Kamp, M.
AU - Höfling, S.
AU - Bayer, M.
AU - Akimov, I.A
ID - 43132
T2 - arxiv:2302.02480
TI - Temporal sorting of optical multi-wave-mixing processes in semiconductor quantum dots
ER -
TY - JOUR
AU - Sperling, Jan
AU - Agudelo, Elizabeth
ID - 44050
IS - 4
JF - Physical Review A
SN - 2469-9926
TI - Entanglement of particles versus entanglement of fields: Independent quantum resources
VL - 107
ER -
TY - JOUR
AU - Sperling, Jan
AU - Gianani, Ilaria
AU - Barbieri, Marco
AU - Agudelo, Elizabeth
ID - 40477
IS - 1
JF - Physical Review A
SN - 2469-9926
TI - Detector entanglement: Quasidistributions for Bell-state measurements
VL - 107
ER -
TY - JOUR
AU - Lüders, Carolin
AU - Pukrop, Matthias
AU - Barkhausen, Franziska
AU - Rozas, Elena
AU - Schneider, Christian
AU - Höfling, Sven
AU - Sperling, Jan
AU - Schumacher, Stefan
AU - Aßmann, Marc
ID - 42973
IS - 11
JF - Physical Review Letters
KW - General Physics and Astronomy
SN - 0031-9007
TI - Tracking Quantum Coherence in Polariton Condensates with Time-Resolved Tomography
VL - 130
ER -
TY - JOUR
AB - We study how competition between physicians affects the provision of medical care. In
our theoretical model, physicians are faced with a heterogeneous patient population, in which patients
systematically vary with regard to both their responsiveness to the provided quality of care and their
state of health. We test the behavioral predictions derived from this model in a controlled laboratory
experiment. In line with the model, we observe that competition significantly improves patient benefits
as long as patients are able to respond to the quality provided. For those patients, who are not able
to choose a physician, competition even decreases the patient benefit compared to a situation without
competition. This decrease is in contrast to our theoretical prediction implying no change in benefits for
passive patients. Deviations from patient-optimal treatment are highest for passive patients in need of
a low quantity of medical services. With repetition, both, the positive effects of competition for active
patients as well as the negative effects of competition for passive patients become more pronounced. Our
results imply that competition can not only improve but also worsen patient outcome and that patients’
responsiveness to quality is decisive.
AU - Brosig-Koch, Jeannette
AU - Hehenkamp, Burkhard
AU - Kokot, Johanna
ID - 44092
JF - Health Economics
KW - physician competition
KW - patient characteristics
KW - heterogeneity in quality responses
KW - fee-for-service
KW - laboratory experiment
TI - Who benefits from quality competition in health care? A theory and a laboratory experiment on the relevance of patient characteristics
ER -
TY - GEN
AB - We consider a model where for-profit providers compete in quality in a price-regulated market that has been opened to competition, and where the incumbent is located at the center of the market, facing high costs of relocation. The model is relevant in markets such as public health care, education and schooling, or postal services. We find that, when the regulated price is low or intermediate, the entrant strategically locates towards the corner of the market to keep the incumbent at the low monopoly quality level. For a high price, the entrant locates at the corner of the market and both providers implement higher quality compared to a monopoly. In any case, the entrant implements higher quality than the incumbent provider. Social welfare is always higher in a duopoly if the cost of quality is low. For higher cost levels welfare is non-monotonic in the price and it can be optimal to the regulator not to use its entire budget. Therefore, the welfare effect of entry depends on the price and the size of the entry cost, and the regulator should condition the decision to allow entry on an assessment of the entry cost.
AU - Hehenkamp, Burkhard
AU - Kaarbøe, Oddvar M.
ID - 44093
KW - Quality competition
KW - Price regulation
KW - Location choice
KW - Product differentiation
TI - Price Regulation, Quality Competition and Location Choice with Costly Relocation
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 - JOUR
AU - Maack, Marten
ID - 44077
IS - 3
JF - Operations Research Letters
KW - Applied Mathematics
KW - Industrial and Manufacturing Engineering
KW - Management Science and Operations Research
KW - Software
SN - 0167-6377
TI - Online load balancing on uniform machines with limited migration
VL - 51
ER -
TY - GEN
AU - Mamedov, Tural
AU - Schleicher, Eckhard
AU - Schubert, Markus
AU - Ehlert, Thomas
AU - Kenig, Eugeny Y.
AU - Hampel, Uwe
ID - 44096
TI - Experimental analysis of ship motion effects on the performance of an absorption column equipped with structured packings
ER -
TY - GEN
AU - Ehlert, Thomas
AU - Mamedov, Tural
AU - Schubert, Markus
AU - Kenig, Eugeny Y.
ID - 44094
TI - Charakterisierung des Einflusses neigungsinduzierter Strömungsformen mit dem Ansatz der hydrodynamsichen Analogie
ER -
TY - GEN
AU - Ehlert, Thomas
AU - Lutters, Nicole
AU - Kenig, Eugeny Y.
ID - 44095
TI - Modellierung des Randspalts in Strukturpackungskolonnen mit dem Ansatz der hydrodynamischen Analogien
ER -
TY - JOUR
AU - Jende, Yvonne Kristin
ID - 44137
JF - Zeitschrift für Kanada-Studien
SN - 0944-7008
TI - "The Future of Canadian Studies: On Plowing a Lonely Furrow."
VL - 43
ER -
TY - BOOK
AU - Bauer, Anna Brigitte
ID - 44083
SN - 978-3-8325-5625-9
TI - Experimentelle Kompetenz Physikstudierender. Entwicklung und erste Erprobung eines performanzorientierten Kompetenzstrukturmodells unter Nutzung qualitativer Methoden
VL - 352
ER -
TY - GEN
AU - Beule, Felix
AU - Schmelzle, Lars
AU - Teutenberg, Dominik
AU - Possart, Gunnar
AU - Meschut, Gerson
AU - Mergheim, Julia
ID - 44181
T2 - 23. Kolloquium: Gemeinsame Forschung in der Klebtechnik
TI - Methodenentwicklung zur Simulation von hyperelastischen Klebverbindungen unter Crashbelastung
ER -
TY - GEN
AU - Schürmann, Patrick
ID - 43374
TI - A Formal Comparison of Advanced Digital Signature Primitives
ER -
TY - CONF
AU - Kowatz, Jannik
AU - Teutenberg, Dominik
AU - Meschut, Gerson
ID - 44183
T2 - 23. Kolloquium Gemeinsame Forschung in der Klebtechnik
TI - Weiterentwicklung der induktiven Schnellhärtung von Klebverbindungen für robuste Fertigungsprozesse unter Berücksichtigung von serienrelevanten Einflussfaktoren
ER -
TY - JOUR
AB - Microcellular wood fiber reinforced polymers offer the possibility to reduce the use of fossil raw materials. In particular, thick-walled structures with thicknesses greater than 6 mm offer a high potential for weight savings. This study investigates the cell structures and mechanical properties of injection-molded test specimens. The influence of different thicknesses (6–10 mm) along with different chemical blowing agents (endothermic, exothermic) with varying dosages (0–2 wt%) is analyzed. The investigations reveal that exothermic chemical blowing agents form finer cells consistently to thin-walled structures than endothermic ones. Higher foaming agent content leads to higher pore fractions, with many small cells coalescing into a large open-pore cell network. The mechanical properties depend mainly on the pore content of the sample. The specific tensile properties deteriorate with the use of chemical blowing agents (CFA), whereas the sandwich structure produced with compact edge layers has a positive influence on the specific flexural properties.
AU - Moritzer, Elmar
AU - Flachmann, Felix
ID - 42515
IS - 3
JF - Journal of Cellular Plastics
KW - Materials Chemistry
KW - Polymers and Plastics
KW - General Chemistry
SN - 0021-955X
TI - Morphological and mechanical properties of foamed thick-walled Wood-Plastic-Composite structures
VL - 59
ER -
TY - JOUR
AU - Burmeister, Sascha Christian
AU - Schryen, Guido
ID - 42179
JF - Energy Systems
TI - Distribution Network Optimization: Predicting computation times to design scenario analysis for network operators
ER -
TY - CONF
AB - Abstract. Friction-spinning as an innovative incremental forming process enables large degrees of deformation in tube and sheet metal-forming due to a self-induced heat generation in the forming zone. This paper presents new process designs for energy and resource-efficient forming of gas cylinders by friction-spinning without the use of an external heat supply. The self-generated heat enables friction-spinning process to reduce the energy demand in the manufacture of gas cylinders, which are usually manufactured with external heat (mostly fossil fuels), by 95 %. Typical gas cylinder contours, such as flattened and spherical bottom ends and cylinder necks, are manufactured by friction-spinning of AW 6060 tubular profiles with specifically designed tool path strategies. It is shown that friction-spinning enables the manufacture of typical gas cylinder contours with sufficient wall thickness and the required gas tightness without the input of external heat. Thus, this process can contribute to an increase in the energy and resource efficiency of forming processes.
AU - Dahms, Frederik
AU - Homberg, Werner
ID - 44035
SN - 2474-395X
T2 - Materials Research Proceedings
TI - Energy and Resource-efficient Forming of Gas Cylinders by Friction-Spinning
ER -
TY - JOUR
AB - The technical importance of paraffins as phase change materials (PCM) in heat storage systems increases. Knowledge on the thermal conductivity of paraffins is necessary for the design and optimization of heat storage systems. However, for most paraffins solely the thermal conductivity of the liquid state has been sufficiently investigated. For the solid state, precise thermal conductivity data are only known for a few paraffins, while only generalized values are available for the remainder, some of which contradict each other. In this study, a measurement setup based on the modified guarded hot plate method is developed. It is used to investigate the thermal conductivity of several paraffines in the solid state, including pure n-docosane and its compounds with different types and concentrations of graphite. For n-docosane in the solid state, the thermal conductivity is determined to be 0.49 W/(m K). A particle size of 200 μm with a spherical shape turns out to be optimal to increase the thermal conductivity. This allows the thermal conductivity of a compound with 10% graphite to increase by a factor of three compared to the pure paraffin. Furthermore, significant differences to thermal conductivity data from the literature are found.
AU - Paul, Andreas
AU - Baumhögger, Elmar
AU - Dewerth, Mats-Ole
AU - Hami Dindar, Iman
AU - Sonnenrein, Gerrit
AU - Vrabec, Jadran
ID - 43391
JF - Journal of Thermal Analysis and Calorimetry
KW - Physical and Theoretical Chemistry
KW - Condensed Matter Physics
SN - 1388-6150
TI - Thermal conductivity of solid paraffins and several n-docosane compounds with graphite
ER -
TY - CONF
AB - Die für die Berechnung des Energieeffizienzindex von Haushaltskältegeräten benötigten Parameter werden durch Norm-Messungen im Neuzustand der Geräte bestimmt. Aus früheren Untersuchungen ist bekannt, dass durch verschiedene technische Alterungsmechanismen der Energieverbrauch über eine Produktlebensdauer von 18 Jahren um bis zu 33 % zunehmen kann. Ziel des vom BMWi geförderten Projekts ALGE war es, die verschie-denen Ursachen und Einflussgrößen für die Alterung von Haushaltskältegeräten zu ermitteln und eine Alterungs-funktion zu bestimmen, die den zeitlichen Verlauf des zunehmenden Energieverbrauchs beschreibt.
In diesem Projekt wurde das Alterungsverhalten von Haushaltskältegeräten durch 100 Normenergieverbrauchs-messungen an 32 real gealterten Geräten untersucht. Aus den gewonnenen Ergebnissen konnte eine Alterungs-funktion bestimmt werden, die den Anstieg des Energieverbrauchs beschreibt. Alle untersuchten Geräte wurden an der Universität Paderborn im Neuzustand vermessen und nach einer Laufzeit von bis zu 21 Jahren erneut geprüft. Bereits nach einem zweijährigen Betrieb konnte ein Mehrverbrauch von bis zu 11 % festgestellt werden. Über die durchschnittliche Produktlebensdauer von Haushaltskältegeräten von ca. 16 Jahren steigert sich der Energieverbrauch um durchschnittlich 27 %.
Im Rahmen des Projekts wurden verschiedene Systemkomponenten, wie Isolierung und Verdichter, hinsichtlich ihres Alterungsverhaltens untersucht. Bei dem im Gehäuse als Isolierung verwendeten PUR-Schaum konnte über einen Zeitraum von 31 Monaten ein Anstieg der Wärmeleitfähigkeit von 19,5 W/(m⋅K) auf 24,5 W/(m⋅K) festge-stellt werden. Zur Untersuchung der Alterung der Verdichter wurden zuvor auf einem Kalorimeterteststand ver-messene Verdichter in Geräte eingebaut. Nach einem zweijährigen Betrieb wurden diese Verdichter wieder aus-gebaut und erneut vermessen. Hierbei konnte keine Änderung des COP festgestellt werden. Zusätzlich zu den technischen Parametern wurde der Einfluss des Verbraucherverhaltens analysiert. Hier zeigte sich, dass bis zu 33 % des Gesamtenergieverbrauchs nach einer mehrjährigen Nutzungsdauer verbraucherinduziert sein können.
AU - Paul, Andreas
AU - Baumhögger, Elmar
AU - Elsner, Andreas
AU - Reineke, Michael
AU - Kasper, Tina
AU - Schumacher, Daniel
AU - Vrabec, Jadran
AU - Hüppe, Christian
AU - Stamminger, Rainer
AU - Hölscher, Heike
AU - Stoll, Ragnar
AU - Wagner, Hendrik
AU - Gries, Ulrich
AU - Becker, Wolfgang
ID - 43394
KW - Haushaltskältegeräte
KW - Energieverbrauch
KW - Alterung
KW - Verdichter
KW - PUR-Schaum
SN - 978-3-932715-55-6
TI - Alterungsmechanismen von Haushaltskältegeräten
ER -
TY - JOUR
AB - Abstract
The accessibility to rheological parameters for concrete is becoming more and more relevant. This is mainly related to the constantly emerging challenges, such as not only the development of high-strength concretes is progressing very fast but also the simulation of the flow behaviour is of high importance. The main problem, however, is that the rheological characterisation of fresh concrete is not possible via commercial rheometers. The so-called concrete rheometers provide valuable relative values for comparing different concretes, but they cannot measure absolute values. Therefore, we developed an adaptive coaxial concrete rheometer (ACCR) that allows the measurement of fresh concrete with particles up to
d
max
=
5.5
mm
{d}_{{\rm{\max }}}=5.5\hspace{.5em}{\rm{mm}}
. The comparison of the ACCR with a commercial rheometer showed very good agreement for selected test materials (Newtonian fluid, shear thinning fluid, suspension, and yield stress fluid), so that self-compacting concrete was subsequently measured. Since these measurements showed a very high reproducibility, the rheological properties of the fresh concrete could be determined with high accuracy. The common flow models (Bingham (B), Herschel–Bulkley, modified Bingham (MB) models) were also tested for their applicability, with the Bingham and the modified Bingham model proving to be the best suitable ones.
AU - Josch, Sebastian
AU - Jesinghausen, Steffen
AU - Schmid, Hans-Joachim
ID - 43034
IS - 1
JF - Applied Rheology
KW - Condensed Matter Physics
KW - General Materials Science
SN - 1617-8106
TI - Development of an adaptive coaxial concrete rheometer and rheological characterisation of fresh concrete
VL - 33
ER -
TY - CONF
AU - Jende, Yvonne Kristin
ID - 44225
T2 - Solidarités. Réseaux – Convivialités – Confrontations/ Solidarities. Networks – Convivialities – Confrontations, 44. Annual Conference of the Association for Canadian Studies in German-Speaking Countries
TI - Please Mind the Gap. Reconfiguring Solidarity through Space in Michael Nicoll Yahgulanaas' Haida Manga Art.
ER -
TY - JOUR
AU - Rüther, Moritz Johannes
AU - Klippstein, Sven Helge
AU - Ponusamy, SathishKumar
AU - Rüther, Torben
AU - Schmid, Hans-Joachim
ID - 43128
JF - Powder Technology
KW - General Chemical Engineering
SN - 0032-5910
TI - Flowability of polymer powders at elevated temperatures for additive manufacturing
VL - 422
ER -
TY - JOUR
AU - Wippermann, Jan
AU - Meschut, Gerson
AU - Koschukow, Wikentji
AU - Liebsch, Alexander
AU - Gude, Maik
AU - Minch, Steven
AU - Kolbe, Björn
ID - 39057
JF - Welding in the World
KW - Metals and Alloys
KW - Mechanical Engineering
KW - Mechanics of Materials
SN - 0043-2288
TI - Thermal influence of resistance spot welding on a nearby overmolded thermoplastic–metal joint
ER -
TY - JOUR
AU - Wippermann, Jan
AU - Koshukow, Wikentij
AU - Liebsch, Alexander
AU - Kolbe, Björn
AU - Meschut, Gerson
AU - Gude, Maik
ID - 44232
JF - Tagungsband Münchener Leichtbauseminar 2022
TI - Influence of plasma coating pretreatment on the adhesion of thermoplastics to metals
ER -
TY - GEN
AU - Ponusamy, SathishKumar
AU - Schmid, Hans-Joachim
ID - 44244
TI - Dynamisch-mechanische Polymerpartikelverrundung zur Verbesserung der Fließfähigkeit für das selektive Lasersintern
ER -
TY - CHAP
AB - State education in honest tax payment can be understood as a facet of training in citizenship, i.e. as an attempt by the modern state to standardize the behavior of its citizens and to prevent deviations. Based on this Foucauldian understanding, this exploratory article examines tax education in the United States, Spain, and West Germany from the mid-1940s to the late 1980s. During this period, the USA asserted itself as the champion of tax education and Spain consistently tried to emulate this example, albeit with more modest means and different semantic strategies from as early as the 1960s, when it was still under a autoritarian regime. The FRG, however, completely discontinued its few early attempts at tax education from the mid-1950s onwards. Even during the economic crises and tax scandals of the 1970s, there was no relaunch of the programs. The article locates the reasons for this highly uneven development in the different ideal images of the citizen in the three states.
AU - Schönhärl, Korinna
AU - Düll, Nasrin
AU - Ramírez Lugo , Nadya Melina
ED - Sébastien, Guex
ED - Hadrien, Buclin
ID - 44249
T2 - Tax Evasion and Tax Havens since the Nineteenth Century
TI - Tax Education After WWII: How Spain, the USA, and West Germany Tried to Make Their Citizens Pay Honestly
ER -
TY - JOUR
AU - Behler, Felix
ID - 44264
IS - 3
JF - Interdisciplinary Discourses, Education and Analysis (IDEA)
SN - 2754-2416
TI - Recapturing Old England – Nostalgia, Aristo-Anglophilia, and the Historical Roots of ITV’s ‘Downton Abbey’
VL - 1
ER -
TY - CONF
AB - Abstract. Due to an increasing volume of shipments, there is a significant need for more delivery vehicles. One approach to reduce the associated increase in carbon dioxide (CO2) emissions is a new light weight design approach involving the substitution of conventional materials with glass fiber mat-reinforced thermoplastics (GMT) based on polypropylene (PP). The application of GMT by compression molding is a widely used process in the automotive industry. However, application in the commercial vehicle sector requires much larger dimensions, making it necessary to clarify whether the manufacturing process and material are suitable for semi-structural applications on this scale. To find this out, two replacement geometries are abstracted in this study and manufactured by varying the main manufacturing parameters. The feasibility can be demonstrated by recording and analyzing the resulting process variables and measuring the formed fiber distribution. At the end of the paper, recommendations are given for the production of GMT structures on the scale of commercial vehicles.
AU - Lückenkötter, Julian
AU - Leimbach, J.P.
AU - Stallmeister, Tim
AU - Marten, Thorsten
AU - Tröster, Thomas
ID - 44154
KW - Compression Molding
KW - Fiber Content
KW - Process Development
KW - Lightweight Design
T2 - Materials Research Proceedings
TI - Feasibility Study of Compression Molding for Large Reinforcement Structures in the Commercial Vehicle Sector
VL - 28
ER -
TY - JOUR
AB - The Saharan desert ant Cataglyphis bombycina is densely covered with shiny silver setae (hair-like structures). Their appearance was explained by geometric optics and total internal reflection. The setae also increase the emissivity of the ant, as they form an effective medium. This work provides additional data on microstructural details of the setae that are used to simulate the scattering of an individual seta to explain their influence on the optical properties. This is achieved by characterization of their structure using light microscopy and scanning/transmission electron microscopy. How the microstructural features influence scattering is investigated wave-optically within the limits of finite-difference time-domain simulations from the ultraviolet to the mid-infrared spectral range to elucidate the optical effects beyond ray optics and effective medium theory. The results show that Mie scattering plays an important role in protecting the ant from solar radiation and could be relevant for its thermal tolerance.
AU - Schwind, Bertram
AU - Wu, Xia
AU - Tiemann, Michael
AU - Fabritius, Helge-Otto
ID - 42679
IS - 3
JF - Journal of the Optical Society of America B
KW - Atomic and Molecular Physics
KW - and Optics
KW - Statistical and Nonlinear Physics
SN - 0740-3224
TI - Broadband Mie scattering effects by structural features of setae from the Saharan silver ant Cataglyphis bombycina
VL - 40
ER -
TY - JOUR
AB - The production of hydrogen and the utilization of biomass for sustainable concepts of energy conversion and storage require gas sensors that discriminate between hydrogen (H2) and carbon monoxide (CO). Mesoporous copper–ceria (Cu–CeO2) materials with large specific surface areas and uniform porosity are prepared by nanocasting, and their textural properties are characterized by N2 physisorption, powder XRD, scanning electron microscopy, transmission electron microscopy, and energy-dispersive X-ray spectroscopy. The oxidation states of copper (Cu+, Cu2+) and cerium (Ce3+, Ce4+) are investigated by XPS. The materials are used as resistive gas sensors for H2 and CO. The sensors show a stronger response to CO than to H2 and low cross-sensitivity to humidity. Copper turns out to be a necessary component; copper-free ceria materials prepared by the same method show only poor sensing performance. By measuring both gases (CO and H2) simultaneously, it is shown that this behavior can be utilized for selective sensing of CO in the presence of H2.
AU - Baier, Dominik
AU - Priamushko, Tatiana
AU - Weinberger, Christian
AU - Kleitz, Freddy
AU - Tiemann, Michael
ID - 43457
IS - 4
JF - ACS Sensors
KW - Fluid Flow and Transfer Processes
KW - Process Chemistry and Technology
KW - Instrumentation
KW - Bioengineering
SN - 2379-3694
TI - Selective Discrimination between CO and H2 with Copper–Ceria-Resistive Gas Sensors
VL - 8
ER -
TY - CONF
AB - Abstract. The combination of incremental sheet metal forming and high-speed forming offers new possibilities for flexible forming processes in the production of large sheet metal components of increased complexity with relatively low forming energies. In this paper, the general feasibility and process differences between the pulse-driven high-speed forming technologies of electrohydraulic and electromagnetic forming were investigated. An example component made of EN AW 6016 aluminum sheet metal was thus formed incrementally by both processes and the forming result evaluated by an optical 3D measurement system. For this purpose, a forming strategy for electromagnetic incremental forming (EMIF) was developed, tested and adapted to the electrohydraulic incremental forming process (EHIF). The discharge energy, the tool displacement and the pressure field of the forming zone were determined as relevant parameters for the definition of an adequate tool path strategy. It was found that the EHIF process is less affected by larger distances between the tool and the blank, while this is a critical variable for force application to the component during EMIF. On the other hand, the more uniform pressure distribution of the EMIF process is advantageous for forming large steady component areas.
AU - Holzmüller, Maik
AU - Linnemann, Maik
AU - Homberg, Werner
AU - Psyk, Verena
AU - Kräusel, Verena
AU - Kroos, Janika
ID - 43044
KW - Incremental Sheet Forming
KW - Aluminium
KW - High-Speed Forming
SN - 2474-395X
T2 - Materials Research Proceedings
TI - Proof of concept for incremental sheet metal forming by means of electromagnetic and electrohydraulic high-speed forming
VL - 25
ER -
TY - JOUR
AB - The pressure fields generated by two simultaneous discharges have not been investigated on any notable scale for the electrohydraulic impulse forming method. In this study, the synchronicity of two discharges is ensured by the sequential connection of two wires mounted in two spark gaps in a common volume of liquid. The objective is to experimentally confirm the equilibrium of the energies evolved in two spark gaps by means of pressure measurements. In addition, multipoint membrane pressure gauges demonstrated the feasibility of easily recording detailed pressure maps. Based on the membrane deformation mechanism and material strengthening under static and impulse conditions, the processing procedure is further developed so as to achieve better accuracy in the determination of pressure field parameters. The practical equality of the pressure fields on the left and right halves of the flat-loaded area confirms the equality of energies evolved in the two spark gaps. The direct shock waves create zones with the most intensive loading. These results provide a basis for the development of new electrohydraulic technologies involving the application of two simultaneous discharges with equal energy and pressure parameters.
AU - Knyazyev, Mykhaylo
AU - Holzmüller, Maik
AU - Homberg, Werner
ID - 43045
IS - 1
JF - Journal of Manufacturing and Materials Processing
KW - impulse
KW - forming
KW - electrohydraulic
KW - discharge
KW - wire
KW - pressure gauge
KW - pressure field
SN - 2504-4494
TI - Investigation of Pressure Fields Generated by Two Simultaneous Discharges in Liquid Initiated by Wires
VL - 7
ER -
TY - JOUR
AU - Neumann, Phillip
ID - 44321
IS - 5
JF - Zeitschrift für Heilpädagogik
KW - Inklusion
KW - Sonderpädagogik
KW - Bildung
KW - Bildungsstudien
KW - Integration
SN - 0513-9066
TI - Studien zu Schulleistungen und ihre Aufbereitung
VL - 74
ER -
TY - CONF
AU - Hami Dindar, Iman
AU - Lutters, Nicole
AU - Kenig, Eugeny
ID - 44320
T2 - Jahrestreffen der ProcessNet-Fachgruppen Fluidverfahrenstechnik und Adsoprtion
TI - Wässrige Glucosaminlösung als neues Lösungsmittel zur CO2-Abscheidung
ER -
TY - CONF
AB - State estimation when only a partial model of a considered system is available remains a major challenge in many engineering fields. This work proposes a joint, square-root unscented Kalman filter to estimate states and model uncertainties simultaneously by linear combinations of physics-motivated library functions. Using a sparsity promoting approach, a selection of those linear combinations is chosen and thus an interpretable model can be extracted. Results indicate a small estimation error compared to a traditional square-root unscented Kalman filter and exhibit the enhancement of physically meaningful models.
AU - Götte, Ricarda-Samantha
AU - Timmermann, Julia
ID - 34171
IS - 1
KW - joint estimation
KW - unscented transform
KW - Kalman filter
KW - sparsity
KW - data-driven
KW - compressed sensing
T2 - 12th IFAC Symposium on Nonlinear Control Systems (NOLCOS 2022)
TI - Estimating States and Model Uncertainties Jointly by a Sparsity Promoting UKF
VL - 56
ER -
TY - JOUR
AB - Room temperature sodium-sulfur (RT Na-S) batteries are considered potential candidates for stationary power storage applications due to their low cost, broad active material availability and low toxicity. Challenges, such as high volume expansion of the S-cathode upon discharge, low electronic conductivity of S as active material and herewith limited rate capability as well as the shuttling of polysulfides (PSs) as intermediates often impede the cycle stability and practical application of Na-S batteries. Sulfurized poly(acrylonitrile) (SPAN) inherently inhibits the shuttling of PSs and shows compatibility with carbonate-based electrolytes, however, its exact redox mechanism remained unclear to date. Herein, we implement a commercially available and simple electrolyte into the Na-SPAN cell chemistry and demonstrate its high rate and cycle stability. Through the application of in situ techniques utilizing electronic impedance spectroscopy (EIS) and X-ray absorption spectroscopy (XAS) at different depths of charge and discharge, an insight into SPAN’s redox chemistry is obtained.
AU - Kappler, Julian
AU - Tonbul, Güldeniz
AU - Schoch, Roland
AU - Murugan, Saravanakumar
AU - Nowakowski, Michał
AU - Lange, Pia Lena
AU - Klostermann, Sina Vanessa
AU - Bauer, Matthias
AU - Schleid, Thomas
AU - Kästner, Johannes
AU - Buchmeiser, Michael Rudolf
ID - 40981
IS - 1
JF - Journal of The Electrochemical Society
KW - Materials Chemistry
KW - Electrochemistry
KW - Surfaces
KW - Coatings and Films
KW - Condensed Matter Physics
KW - Renewable Energy
KW - Sustainability and the Environment
KW - Electronic
KW - Optical and Magnetic Materials
SN - 0013-4651
TI - Understanding the Redox Mechanism of Sulfurized Poly(acrylonitrile) as Highly Rate and Cycle Stable Cathode Material for Sodium-Sulfur Batteries
VL - 170
ER -
TY - JOUR
AB - The success of engineering complex technical systems is determined by meeting customer requirements and institutional regulations. One example relevant to the automobile industry is the United Nations Economic Commission of Europe (UN ECE), which specifies the homologation of automobile series and requires proof of traceability. The required traceability can be achieved by modeling system artifacts and their relations in a consistent, seamless model—an effect-chain model. Currently, no in-depth methodology exists to support engineers in developing certification-compliant effect-chain models. For this purpose, a new methodology for certification-compliant effect-chain modeling was developed, which includes extensions of an existing method, suitable models, and tools to support engineers in the modeling process. For evaluation purposes, applicability is proven based on the experience of more than 300 workshops at an automotive OEM and an automotive supplier. The following case example is chosen to demonstrate applicability: the development of a window lifter that has to meet the demands of UN ECE Regulations R156 and R21. Results indicate multiple benefits in supporting engineers with the certification-compliant modeling of effect chains. Three benefits are goal-oriented modeling to reduce the necessary modeling capacity, increasing model quality by applying information quality criteria, and the potential to reduce costs through automatable effect-chain analyses for technical changes. Further, companies in the automotive and other industries will benefit from increased modeling capabilities that can be used for architecture modeling and to comply with other regulations such as ASPICE or ISO 26262.
AU - Gräßler, Iris
AU - Wiechel, Dominik
AU - Koch, Anna-Sophie
AU - Sturm, Tim
AU - Markfelder, Thomas
ID - 44382
IS - 3
JF - Systems
KW - Information Systems and Management
KW - Computer Networks and Communications
KW - Modeling and Simulation
KW - Control and Systems Engineering
KW - Software
SN - 2079-8954
TI - Methodology for Certification-Compliant Effect-Chain Modeling
VL - 11
ER -
TY - GEN
AU - Tonbul, Güldeniz
AU - Kappler, Julian
AU - Murugan, Saravanakumar
AU - Schoch, Roland
AU - Nowakowski, Michal
AU - Lange, Pia
AU - Bauer, Matthias
AU - Buchmeiser, Michael R.
ID - 44380
TI - Characterization of Na-S Battery System Using X-ray Absorption Spectroscopy
ER -
TY - CONF
AB - The development of autonomous vehicles and their introduction in urban traffic offer many opportunities for traffic improvements. In this paper, an approach for a future traffic control system for mixed autonomy traffic environments is presented. Furthermore, a simulation framework based on the city of Paderborn is introduced to enable the development and examination of such a system. This encompasses multiple elements including the road network itself, traffic lights, sensors as well as methods to analyse the topology of the network. Furthermore, a procedure for traffic demand generation and routing is presented based on statistical data of the city and traffic data obtained by measurements. The resulting model can receive and apply the generated control inputs and in turn generates simulated sensor data for the control system based on the current system state.
AU - Link, Christopher
AU - Malena, Kevin
AU - Gausemeier, Sandra
AU - Trächtler, Ansgar
ID - 44390
KW - Traffic Simulation
KW - Traffic Control
KW - Car2X
KW - Mixed Autonomy
KW - Autonomous Vehicles
KW - SUMO
KW - Sensor Simulation
KW - Traffic Demand Generation
KW - Routing
KW - Traffic Lights
KW - Graph Analysis
KW - Traffic Observer
SN - 978-989-758-652-1
T2 - Proceedings of the 9th International Conference on Vehicle Technology and Intelligent Transport Systems
TI - Simulation Environment for Traffic Control Systems Targeting Mixed Autonomy Traffic Scenarios
ER -
TY - CONF
AU - Althaus, Maike
AU - Müller, Michelle
AU - Vorbohle, Christian
AU - Kundisch, Dennis
ID - 44444
T2 - Proceedings of the International Conference on Challenges in Managing Smart Products and Services (CHIMSPAS 2023)
TI - Business Models for Cultural Event Platforms – A Taxonomy Approach
ER -
TY - CONF
AU - Laux, Florian
AU - Poniatowski, Martin
AU - Kundisch, Dennis
ID - 44053
T2 - Proceedings of the 31st European Conference on Information Systems (ECIS)
TI - May I have your Attention, please? – The Interaction between Attention Screening and Reputation on Crowdworking Platforms
ER -
TY - GEN
AU - Neukötter, Moritz
AU - Jesinghausen, Steffen
AU - Schmid, Hans-Joachim
ID - 44103
TI - Particles as Seeds for Instabilities in Uniaxially Elongated Polymer Suspension Filaments (Presentation)
ER -
TY - JOUR
AU - Küster, Christine
AU - Klünder, Nina
AU - Wagenknecht, Inga
ID - 44477
JF - Hauswirtschaft und Wissenschaft
SN - 2626-0913
TI - Haushaltswissenschaft – Eine Diskussionsgrundlage
VL - 71
ER -
TY - CHAP
AU - Meine, Sabine
AU - Otto, Arnold
AU - Süßmann, Johannes
ID - 35063
SN - 978-3-8260-7218-5
T2 - Musiklandschaften zwischen Rhein und Weser. Pluralisierung und Verflechtung entlang des Hellwegs in der Frühen Neuzeit. Unter Mitarbeit v. Markus Lauert
TI - Musiklandschaften zwischen Rhein und Weser – Einführung
ER -
TY - CONF
AU - Gharibian, Sevag
AU - Watson, James
AU - Bausch, Johannes
ID - 20841
T2 - Proceedings of the 40th International Symposium on Theoretical Aspects of Computer Science (STACS)
TI - The Complexity of Translationally Invariant Problems beyond Ground State Energies
VL - 254
ER -
TY - GEN
AB - Extending the notion of maxcut, the study of the frustration index of signed graphs is one of the basic questions in the theory of signed graphs. Recently two of the authors initiated the study of critically frustrated signed graphs. That is a signed graph whose frustration index decreases with the removal of any edge. The main focus of this study is on critical signed graphs which are not edge-disjoint unions of critically frustrated signed graphs (namely non-decomposable signed graphs) and which are not built from other critically frustrated signed graphs by subdivision. We conjecture that for any given k there are only finitely many critically k-frustrated signed graphs of this kind.
Providing support for this conjecture we show that there are only two of such critically 3-frustrated signed graphs where there is no pair of edge-disjoint negative cycles. Similarly, we show that there are exactly ten critically 3-frustrated signed planar graphs that are neither decomposable nor subdivisions of other critically frustrated signed graphs. We present a method for building non-decomposable critically frustrated signed graphs based on two given such signed graphs. We also show that the condition of being non-decomposable is necessary for our conjecture.
AU - Cappello, Chiara
AU - Naserasr, Reza
AU - Steffen, Eckhard
AU - Wang, Zhouningxin
ID - 44501
T2 - arXiv:2304.10243
TI - Critically 3-frustrated signed graphs
ER -
TY - JOUR
AU - Tapio, Kosti
AU - Kielar, Charlotte
AU - Parikka, Johannes M.
AU - Keller, Adrian
AU - Järvinen, Heini
AU - Fahmy, Karim
AU - Toppari, J. Jussi
ID - 42517
JF - Chemistry of Materials
KW - Materials Chemistry
KW - General Chemical Engineering
KW - General Chemistry
SN - 0897-4756
TI - Large-Scale Formation of DNA Origami Lattices on Silicon
VL - 35
ER -
TY - JOUR
AU - Pothineni, Bhanu Kiran
AU - Keller, Adrian
ID - 42518
JF - Advanced NanoBiomed Research
KW - General Medicine
SN - 2699-9307
TI - Nanoparticle‐Based Formulations of Glycopeptide Antibiotics: A Means for Overcoming Vancomycin Resistance in Bacterial Pathogens?
VL - 3
ER -
TY - JOUR
AU - Hanke, Marcel
AU - Tomm, Emilia
AU - Grundmeier, Guido
AU - Keller, Adrian
ID - 44503
JF - ChemBioChem
KW - Organic Chemistry
KW - Molecular Biology
KW - Molecular Medicine
KW - Biochemistry
SN - 1439-4227
TI - Effect of Ionic Strength on the Thermal Stability of DNA Origami Nanostructures
ER -
TY - JOUR
AU - Linko, Veikko
AU - Keller, Adrian
ID - 44504
JF - Small
KW - Biomaterials
KW - Biotechnology
KW - General Materials Science
KW - General Chemistry
SN - 1613-6810
TI - Stability of DNA Origami Nanostructures in Physiological Media: The Role of Molecular Interactions
ER -
TY - THES
AU - Kruse, Anne
ID - 44509
SN - 978-3-8440-8955-4
TI - Entwicklung einer Methode zur Integration der Additiven Fertigung in die Serienproduktion am Beispiel des Lasersinterns
VL - 27
ER -
TY - GEN
AB - For open world applications, deep neural networks (DNNs) need to be aware of
previously unseen data and adaptable to evolving environments. Furthermore, it
is desirable to detect and learn novel classes which are not included in the
DNNs underlying set of semantic classes in an unsupervised fashion. The method
proposed in this article builds upon anomaly detection to retrieve
out-of-distribution (OoD) data as candidates for new classes. We thereafter
extend the DNN by $k$ empty classes and fine-tune it on the OoD data samples.
To this end, we introduce two loss functions, which 1) entice the DNN to assign
OoD samples to the empty classes and 2) to minimize the inner-class feature
distances between them. Thus, instead of ground truth which contains labels for
the different novel classes, the DNN obtains a single OoD label together with a
distance matrix, which is computed in advance. We perform several experiments
for image classification and semantic segmentation, which demonstrate that a
DNN can extend its own semantic space by multiple classes without having access
to ground truth.
AU - Uhlemeyer, Svenja
AU - Lienen, Julian
AU - Hüllermeier, Eyke
AU - Gottschalk, Hanno
ID - 44512
T2 - arXiv:2305.00983
TI - Detecting Novelties with Empty Classes
ER -
TY - CONF
AU - Wurst, Johanna
AU - Steinhoff, Timon
AU - Mozgova, Iryna
AU - Hassel, Thomas
AU - Lachmayer, Roland
ID - 44521
TI - Aspects of a Sustainability Focused Comparison of the Wire Arc Additive Manufacturing (WAAM) and the Laser Powder Bed Fusion (LPBF) Process
ER -
TY - CONF
AU - Wurst, Johanna
AU - Rosemann, Daniel
AU - Mozgova, Iryna
AU - Lachmayer, Roland
ID - 44522
TI - Concept and Implementation of a Student Design Project for the Development of Sustainable Products
ER -
TY - JOUR
AU - Paradies, Jan
ID - 44523
IS - 7
JF - Accounts of Chemical Research
KW - General Medicine
KW - General Chemistry
SN - 0001-4842
TI - Structure–Reactivity Relationships in Borane-Based FLP-Catalyzed Hydrogenations, Dehydrogenations, and Cycloisomerizations
VL - 56
ER -
TY - BOOK
ED - Meier-Gräwe, Uta
ED - Praetorius, Ina
ED - Tecklenburg, Feline
ID - 44524
SN - 9783847425922
TI - Wirtschaft neu ausrichten. Care-Initiativen in Deutschland, Österreich und der Schweiz.
ER -
TY - JOUR
AB - IntroductionExergames are increasingly used in rehabilitation settings for older adults to train physical and cognitive abilities. To meet the potential that exergames hold, they need to be adapted to the individual abilities of the player and their training objectives. Therefore, it is important to know whether and how game characteristics affect their playing. The aim of this study is to investigate the effect of two different kinds of exergame (step game and balance game) played at two difficulty levels on brain activity and physical activity.MethodsTwenty-eight older independently living adults played two different exergames at two difficulty levels each. In addition, the same movements as during gaming (leaning sideways with feet in place and stepping sideways) were performed as reference movements. Brain activity was recorded using a 64-channel EEG system to assess brain activity, while physical activity was recorded using an accelerometer at the lower back and a heart rate sensor. Source-space analysis was applied to analyze the power spectral density in theta (4 Hz–7 Hz) and alpha-2 (10 Hz–12 Hz) frequency bands. Vector magnitude was applied to the acceleration data.ResultsFriedman ANOVA revealed significantly higher theta power for the exergaming conditions compared to the reference movement for both games. Alpha-2 power showed a more diverse pattern which might be attributed to task-specific conditions. Acceleration decreased significantly from the reference movement to the easy condition to the hard condition for both games.DiscussionThe results indicate that exergaming increases frontal theta activity irrespective of type of game or difficulty level, while physical activity decreases with increasing difficulty level. Heart rate was found to be an inappropriate measure in this population older adults. These findings contribute to understanding of how game characteristics affect physical and cognitive activity and consequently need to be taken into account when choosing appropriate games and game settings for exergame interventions.
AU - Müller, Helen
AU - Baumeister, Jochen
AU - Bardal, Ellen Marie
AU - Vereijken, Beatrix
AU - Skjæret-Maroni, Nina
ID - 44545
JF - Frontiers in Aging Neuroscience
KW - Cognitive Neuroscience
KW - Aging
SN - 1663-4365
TI - Exergaming in older adults: the effects of game characteristics on brain activity and physical activity
VL - 15
ER -
TY - CHAP
AU - Labusch, Amelie
AU - Eickelmann, Birgit
ED - Keane, T.
ED - Fluck, A. E.
ID - 43170
SN - 9783031219696
T2 - Teaching coding in K-12 schools: Research and application
TI - Learning Computational Thinking in Secondary School (Year 8) in Germany in International Comparison: Results from ICILS 2018
ER -
TY - CHAP
AU - Schulze, Johanna
AU - Drossel, Kerstin
AU - Eickelmann, Birgit
ED - Irion, T.
ED - Böttinger, T.
ED - Kammerl, R.
ID - 44626
T2 - Professionalisierung für digitale Bildung im Grundschulalter - Ergebnisse des Forschungsprojekts P3DiG
TI - Die inhaltliche Ausgestaltung schulischer Medienkonzepte als Gelingensbedingung digitalisierungsbezogener Schulentwicklungsprozesse
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 - GEN
AU - Gerick, J.
AU - Eickelmann, Birgit
AU - Rau, M.
AU - Panten, B.
AU - Rothärmel, A.
AU - Gottschalk, T.
ID - 44628
TI - Digitalisierungsbezogene Schulentwicklungsprozesse erfolgreich gestalten. Handreichung für die schulische Arbeit zu den Ergebnissen des Forschungsprojekts GuTe DigiSchulen NRW.
ER -
TY - JOUR
AU - Kowatz, Jannik
AU - Teutenberg, Dominik
AU - Meschut, Gerson
ID - 35536
JF - International Journal of Adhesion and Adhesives
SN - 0143-7496
TI - Optimization of inductive fast-curing of epoxy adhesive by model-based kinetics
VL - 124
ER -
TY - GEN
AU - Salten, Alexander Heinrich Johannes
AU - Al Trjman, Mohamad
AU - Meschut, Gerson
AU - Kenig, Eugeny Y.
ID - 44228
TI - Simulation des „viscous fingering“ Effektes in Klebverbindungen
ER -
TY - GEN
AU - Al Trjman, Mohamad
AU - Meschut, Gerson
AU - Salten, Alexander Heinrich Johannes
AU - Kenig, Eugeny Y.
ID - 44227
TI - Methodenentwicklung zur Simulation des Viscous Fingering in Klebverbindungen von stahlintensiven Mischbaustrukturen
ER -
TY - JOUR
AB - With enhancing digitalization, condition monitoring is used in an increasing number of application fields across various industrial sectors. By its application, increased reliability as well as reduced risks and costs can be achieved. Based on different approaches, technical systems are monitored and measured data is analyzed to enable condition-based or predictive maintenance. To this end, machine learning approaches are usually implemented to diagnose the health states or predict the health index of the monitored system. However, these trained models are often black-box models, not intuitively explainable for a human. To overcome this shortcoming, a model-based approach based on physics is developed for piezoelectric bending actuators. Such a model enables a transparent representation of the system. Moreover, the model-based approach is extended by a parameter-estimation to account for sudden changes in behavior e. g. caused by occurring cracks.
AU - Bender, Amelie
ID - 44672
JF - Sensors and Actuators A: Physical
KW - Condition Monitoring
KW - Model-based approach Diagnostics
KW - Varying conditions
KW - Explainability
KW - Piezoelectric bending actuators
SN - 0924-4247
TI - Model-based condition monitoring of piezoelectric bending actuators
VL - 357
ER -
TY - JOUR
AB - Entwicklungsprojekte stehen in einem Spannungsfeld von Volatilität, Unsicherheit, Komplexität und Ambiguität (VUCA). Resilient Requirements Engineering (RRE) ist ein vielversprechender Ansatz, diesen Rahmenbedingungen gerecht zu werden und erfolgreich zu entwickeln. Es werden Methoden aus den drei Innovationsfeldern des RRE – Vorausschau, Effizienz und Nachhaltigkeit – angewendet, um Effizienzpotenziale in der Produktentwicklung zu nutzen und frühzeitig Nachhaltigkeitsdimensionen in der Ermittlung von Stakeholderbedürfnissen zu verankern.
AU - Gräßler, Iris
AU - Oleff, Christian
AU - Preuß, Daniel
AU - Koch, Anna-Sophie
ID - 44687
IS - 4
JF - Zeitschrift für wirtschaftlichen Fabrikbetrieb
KW - Management Science and Operations Research
KW - Strategy and Management
KW - General Engineering
SN - 2511-0896
TI - Resilient Requirements Engineering
VL - 118
ER -
TY - CONF
AU - Ahmed, Qazi Arbab
AU - Awais, Muhammad
AU - Platzner, Marco
ID - 44194
T2 - The 24th International Symposium on Quality Electronic Design (ISQED'23), San Francisco, Califorina USA
TI - MAAS: Hiding Trojans in Approximate Circuits
ER -
TY - GEN
AU - Schweichhart, Jonas
ID - 44735
TI - Minimum Edge Cuts in Overlay Networks
ER -
TY - CHAP
AU - Castenow, Jannik
AU - Harbig, Jonas
AU - Meyer auf der Heide, Friedhelm
ID - 44769
SN - 0302-9743
T2 - Lecture Notes in Computer Science
TI - Unifying Gathering Protocols for Swarms of Mobile Robots
ER -
TY - GEN
AU - Temborius, Fiona
AU - Neukötter, Moritz
ID - 44101
TI - Polymere unter Dehnung: Untersuchung der Filamententstehung von Polymerblends und deren Instabilitätsentstehung durch Partikeln
ER -
TY - GEN
AU - Almohammad, Ahmad
AU - Neukötter, Moritz
ID - 42997
TI - Untersuchung dehnrheologischer Eigenschaften - Suspensionen auf Basis von Polymerlösungen
ER -
TY - JOUR
AB - Dispersion is present in every optical setup and is often an undesired effect, especially in nonlinear-optical experiments where ultrashort laser pulses are needed. Typically, bulky pulse compressors consisting of gratings or prisms are used
to address this issue by precompensating the dispersion of the optical components. However, these devices are only able to compensate for a part of the dispersion (second-order dispersion). Here, we present a compact pulse-shaping device that uses plasmonic metasurfaces to apply an arbitrarily designed spectral phase delay allowing for a full dispersion control. Furthermore, with specific phase encodings, this device can be used to temporally reshape the incident laser pulses into more complex pulse forms such as a double pulse. We verify the performance of our device by using an SHG-FROG measurement setup together with a retrieval algorithm to extract the dispersion that our device applies to an incident laser pulse.
AU - Geromel, René
AU - Georgi, Philip
AU - Protte, Maximilian
AU - Lei, Shiwei
AU - Bartley, Tim
AU - Huang, Lingling
AU - Zentgraf, Thomas
ID - 44044
IS - 8
JF - Nano Letters
KW - Mechanical Engineering
KW - Condensed Matter Physics
KW - General Materials Science
KW - General Chemistry
KW - Bioengineering
SN - 1530-6984
TI - Compact Metasurface-Based Optical Pulse-Shaping Device
VL - 23
ER -
TY - JOUR
AB - Hydrothermal carbonization (HTC) is an efficient thermochemical method for the conversion of organic feedstock to carbonaceous solids. HTC of different saccharides is known to produce microspheres (MS) with mostly Gaussian size distribution, which are utilized as functional materials in various applications, both as pristine MS and as a precursor for hard carbon MS. Although the average size of the MS can be influenced by adjusting the process parameters, there is no reliable mechanism to affect their size distribution. Our results demonstrate that HTC of trehalose, in contrast to other saccharides, results in a distinctly bimodal sphere diameter distribution consisting of small spheres with diameters of (2.1 ± 0.2) μm and of large spheres with diameters of (10.4 ± 2.6) μm. Remarkably, after pyrolytic post-carbonization at 1000 °C the MS develop a multimodal pore size distribution with abundant macropores > 100 nm, mesopores > 10 nm and micropores < 2 nm, which were examined by small-angle X-ray scattering and visualized by charge-compensated helium ion microscopy. The bimodal size distribution and hierarchical porosity provide an extraordinary set of properties and potential variables for the tailored synthesis of hierarchical porous carbons, making trehalose-derived hard carbon MS a highly promising material for applications in catalysis, filtration, and energy storage devices.
AU - Wortmann, Martin
AU - Keil, Waldemar
AU - Diestelhorst, Elise
AU - Westphal, Michael
AU - Haverkamp, René
AU - Brockhagen, Bennet
AU - Biedinger, Jan
AU - Bondzio, Laila
AU - Weinberger, Christian
AU - Baier, Dominik
AU - Tiemann, Michael
AU - Hütten, Andreas
AU - Hellweg, Thomas
AU - Reiss, Günter
AU - Schmidt, Claudia
AU - Sattler, Klaus
AU - Frese, Natalie
ID - 44837
IS - 21
JF - RSC Advances
KW - General Chemical Engineering
KW - General Chemistry
SN - 2046-2069
TI - Hard carbon microspheres with bimodal size distribution and hierarchical porosity via hydrothermal carbonization of trehalose
VL - 13
ER -
TY - GEN
AU - Bünder, Dirk
AU - Neukötter, Moritz
ID - 42999
TI - Theoretische Beschreibung des Polymerverhaltens in Polymerlösungen und - schmelzen: Simulationen anhand des Rolie-Poly-Modells
ER -
TY - GEN
AU - Al Mamoun, Mohamed
AU - Neukötter, Moritz
ID - 42995
TI - Evaluation of self-built low-budget particle sensors (Study Project)
ER -
TY - BOOK
AU - Teichert, Jeannine
ID - 44246
TI - Digital occupants – Wie digitale Medien die kommunikative Aushandlung von Freundschaften verändern
ER -
TY - JOUR
AU - Teichert, Jeannine
AU - Meister, Dorothee M.
ID - 44247
JF - MedienPädagogik
TI - Mediale Identitätsaushandlungen deutscher MigrantInnen im Zuge des Brexit
ER -
TY - CHAP
AU - Kruse, Iris
AU - Maubach, Bernd
AU - Tönsing, Johanna
ED - Kruse, Iris
ED - Josting, Petra
ID - 42183
SN - 978-3-96848-094-7
T2 - Salah Naoura
TI - "Lesungen vor Kindern sind für mich Theater" / Salah Naouras Sicht auf Wirkliches und Mögliches in Autor*innenlesungen für Kinder in der Schule
VL - 12
ER -
TY - CHAP
AU - Kruse, Iris
AU - Schäfer, Luisa Maria
ED - Kruse, Iris
ED - Josting, Petra
ID - 42182
SN - 978-3-96848-094-7
T2 - Salah Naoura
TI - Held*innenträume. Superheldinnen und Superhelden selbst erdacht / Paderborner Grundschulkinder werden auf die Begegnung mit Salah Naoura vorbereitet
VL - 12
ER -
TY - BOOK
ED - Kruse, Iris
ED - Josting, Petra
ID - 42178
SN - 978-3-96848-094-7
TI - Salah Naoura
VL - 12
ER -
TY - JOUR
AB - Ancestral reconstruction is a classic task in comparative genomics. Here, we study the genome median problem, a related computational problem which, given a set of three or more genomes, asks to find a new genome that minimizes the sum of pairwise distances between it and the given genomes. The distance stands for the amount of evolution observed at the genome level, for which we determine the minimum number of rearrangement operations necessary to transform one genome into the other. For almost all rearrangement operations the median problem is NP-hard, with the exception of the breakpoint median that can be constructed efficiently for multichromosomal circular and mixed genomes. In this work, we study the median problem under a restricted rearrangement measure called c4-distance, which is closely related to the breakpoint and the DCJ distance. We identify tight bounds and decomposers of the c4-median and develop algorithms for its construction, one exact ILP-based and three combinatorial heuristics. Subsequently, we perform experiments on simulated data sets. Our results suggest that the c4-distance is useful for the study the genome median problem, from theoretical and practical perspectives.
AU - Silva, Helmuth O.M.
AU - Rubert, Diego P.
AU - Araujo, Eloi
AU - Steffen, Eckhard
AU - Doerr, Daniel
AU - Martinez, Fábio V.
ID - 44857
IS - 3
JF - RAIRO - Operations Research
KW - Management Science and Operations Research
KW - Computer Science Applications
KW - Theoretical Computer Science
SN - 0399-0559
TI - Algorithms for the genome median under a restricted measure of rearrangement
VL - 57
ER -
TY - GEN
AU - Ma, Yulai
AU - Mattiolo, Davide
AU - Steffen, Eckhard
AU - Wolf, Isaak Hieronymus
ID - 44859
T2 - arXiv:2305.08619
TI - Sets of r-graphs that color all r-graphs
ER -
TY - JOUR
AU - Lenz, Peter
AU - Mahnken, Rolf
ID - 44888
IS - 1
JF - PAMM
KW - Electrical and Electronic Engineering
KW - Atomic and Molecular Physics
KW - and Optics
SN - 1617-7061
TI - Thermo‐chemo‐mechanical modelling of a curing process combined with mean‐field homogenization methods at large strains
VL - 22
ER -
TY - CONF
AU - Wolters, Dennis
AU - Engels, Gregor
ID - 34294
SN - 2184-4348
T2 - MODELSWARD'23
TI - Model-driven Collaborative Design of Professional Education Programmes With Extended Online Whiteboards
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 - 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 - 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 - Kaimann, Daniel
AU - Spiess Bru, Clarissa Laura Maria
AU - Frick, Bernd
ID - 44897
JF - Journal of Wine Economics
TI - Ratings Meet Prices: The Dynamic Relationship of Quality Signals
ER -
TY - CONF
AB - In order to follow the 1.5 degree path of the Paris Climate Agreement, drastic greenhouse gas reduction measures are needed in the transport sector. The potential of public transport and new mobility services to reduce transport-related greenhouse gas emissions cannot yet be fully exploited, especially in rural regions. This paper presents the concept of an innovative mobility system, called NeMo.bil, that intends to fill the gap between individual and public transport to create a demand-oriented and sustainable mobility offer. The concept is based on convoy formation of autonomously driving lightweight vehicles serving the first and last mile and a larger towing vehicle carrying enough power and energy to move the convoy over longer distances at higher speeds. This combination of two different vehicles, intelligently controlled by a digital ecosystem, aims to significantly increasing energy, resource and cost efficiency. Based on an analysis of previous approaches for innovative mobility solutions, the concept is derived from a technical and sociological perspective and its potential for reducing energy demand is calculated.
AU - Ostermann, Moritz
AU - Behm, Jonathan
AU - Marten, Thorsten
AU - Tröster, Thomas
AU - Weyer, Johannes
AU - Cepera, Kay
AU - Adelt, Fabian
ED - Proff, Heike
ID - 44502
SN - 9783658394370
T2 - Towards the New Normal in Mobility
TI - Individualization of Public Transport – Integration of Technical and Social Dimensions of Sustainable Mobility
ER -