TY - JOUR
AB - Nonlinear and quantum optical devices based on periodically-poled thin film lithium niobate (PP-TFLN) have gained considerable interest lately, due to their significantly improved performance as compared to their bulk counterparts. Nevertheless, performance parameters such as conversion efficiency, minimum pump power, and spectral bandwidth strongly depend on the quality of the domain structure in these PP-TFLN samples, e.g., their homogeneity and duty cycle, as well as on the overlap and penetration depth of domains with the waveguide mode. Hence, in order to propose improved fabrication protocols, a profound quality control of domain structures is needed that allows quantifying and thoroughly analyzing these parameters. In this paper, we propose to combine a set of nanometer-to-micrometer-scale imaging techniques, i.e., piezoresponse force microscopy (PFM), second-harmonic generation (SHG), and Raman spectroscopy (RS), to access the relevant and crucial sample properties through cross-correlating these methods. Based on our findings, we designate SHG to be the best-suited standard imaging technique for this purpose, in particular when investigating the domain poling process in x-cut TFLNs. While PFM is excellently recommended for near-surface high-resolution imaging, RS provides thorough insights into stress and/or defect distributions, as associated with these domain structures. In this context, our work here indicates unexpectedly large signs for internal fields occurring in x-cut PP-TFLNs that are substantially larger as compared to previous observations in bulk LN.
AU - Reitzig, Sven
AU - Rüsing, Michael
AU - Zhao, Jie
AU - Kirbus, Benjamin
AU - Mookherjea, Shayan
AU - Eng, Lukas M.
ID - 47963
IS - 3
JF - Crystals
KW - Inorganic Chemistry
KW - Condensed Matter Physics
KW - General Materials Science
KW - General Chemical Engineering
SN - 2073-4352
TI - “Seeing Is Believing”—In-Depth Analysis by Co-Imaging of Periodically-Poled X-Cut Lithium Niobate Thin Films
VL - 11
ER -
TY - JOUR
AB - In the last two decades, variably doped strontium barium niobate (SBN) has attracted a lot of scientific interest mainly due to its specific non-linear optical response. Comparably, the parental compound, i.e., undoped SBN, appears to be less studied so far. Here, two different cuts of single-crystalline nominally pure strontium barium niobate in the composition Sr0.61Ba0.39Nb2O6 (SBN61) are comprehensively studied and analyzed with regard to their photoconductive responses. We present conductance measurements under systematically varied illumination conditions along either the polar z-axis or perpendicular to it (x-cut). Apart from a pronounced photoconductance (PC) already under daylight and a large effect upon super-bandgap illumination in general, we observe (i) distinct spectral features when sweeping the excitation wavelength over the sub-bandgap region as then discussed in the context of deep and shallow trap states, (ii) extremely slow long-term relaxation for both light-on and light-off transients in the range of hours and days, (iii) a critical dependence of the photoresponse on the pre-illumination history of the sample, and (iv) a current–voltage hysteresis depending on both the illumination and the electrical-measurement conditions in a complex manner.
AU - Beyreuther, Elke
AU - Ratzenberger, Julius
AU - Roeper, Matthias
AU - Kirbus, Benjamin
AU - Rüsing, Michael
AU - Ivleva, Liudmila I.
AU - Eng, Lukas M.
ID - 47964
IS - 7
JF - Crystals
KW - Inorganic Chemistry
KW - Condensed Matter Physics
KW - General Materials Science
KW - General Chemical Engineering
SN - 2073-4352
TI - Photoconduction of Polar and Nonpolar Cuts of Undoped Sr0.61Ba0.39Nb2O6 Single Crystals
VL - 11
ER -
TY - JOUR
AB - Exceptionally electron-rich, nearly trigonal-planar tricyanidometalate anions [Fe(CN)3]7− and [Ru(CN)3]7− were stabilized in LiSr3[Fe(CN)3] and AE3.5[M(CN)3] (AE=Sr, Ba; M=Fe, Ru). They are the first examples of group 8 elements with the oxidation state of −IV. Microcrystalline powders were obtained by a solid-state route, single crystals from alkali metal flux. While LiSr3[Fe(CN)3] crystallizes in P63/m, the polar space group P63 with three-fold cell volume for AE3.5[M(CN)3] is confirmed by second harmonic generation. X-ray diffraction, IR and Raman spectroscopy reveal longer C−N distances (124–128 pm) and much lower stretching frequencies (1484–1634 cm−1) than in classical cyanidometalates. Weak C−N bonds in combination with strong M−C π-bonding is a scheme also known for carbonylmetalates. Instead of the formal notation [Fe−IV(CN−)3]7−, quantum chemical calculations reveal non-innocent intermediate-valent CN1.67− ligands and a closed-shell d10 configuration for Fe, that is, Fe2−.
AU - Jach, Franziska
AU - Wagner, Frank R.
AU - Amber, Zeeshan H.
AU - Rüsing, Michael
AU - Hunger, Jens
AU - Prots, Yurii
AU - Kaiser, Martin
AU - Bobnar, Matej
AU - Jesche, Anton
AU - Eng, Lukas M.
AU - Ruck, Michael
AU - Höhn, Peter
ID - 47965
IS - 29
JF - Angewandte Chemie International Edition
KW - General Chemistry
KW - Catalysis
SN - 1433-7851
TI - Tricyanidoferrates(−IV) and Ruthenates(−IV) with Non‐Innocent Cyanido Ligands
VL - 60
ER -
TY - JOUR
AB - Thin-film lithium niobate (TFLN) in the form of x- or z-cut lithium-niobate-on-insulator has attracted considerable interest as a very promising and novel platform for developing integrated optoelectronic (nano)devices and exploring fundamental research. Here, we investigate the coherent interaction length lc of optical second-harmonic generation (SHG) microscopy in such samples, that are purposely prepared into a wedge shape, in order to elegantly tune the geometrical confinement from bulk thicknesses down to approximately 50 nm. SHG microscopy is a very powerful and non-invasive tool for the investigation of structural properties in the biological and solid-state sciences, especially for visualizing and analyzing ferroelectric domains and domain walls. However, unlike in bulk lithium niobate (LN), SHG microscopy in TFLN is impacted by interfacial reflections and resonant enhancement, both of which rely on film thickness and substrate material. In this paper, we show that the dominant SHG contribution measured on TFLN in backreflection is the co-propagating phase-matched SHG signal and not the counter-propagating SHG portion as is the case for bulk LN samples. Moreover, lc depends on the incident pump laser wavelength (sample dispersion) but also on the numerical aperture of the focussing objective in use. These experimental findings on x- and z-cut TFLN are excellently backed up by our advanced numerical simulations.
AU - Amber, Zeeshan H.
AU - Kirbus, Benjamin
AU - Eng, Lukas M.
AU - Rüsing, Michael
ID - 47973
IS - 13
JF - Journal of Applied Physics
KW - General Physics and Astronomy
SN - 0021-8979
TI - Quantifying the coherent interaction length of second-harmonic microscopy in lithium niobate confined nanostructures
VL - 130
ER -
TY - JOUR
AB - Orange-colored crystals of the oxoferrate tellurate K12+6xFe6Te4−xO27 [x=0.222(4)] were synthesized in a potassium hydroxide hydroflux with a molar water–base ratio n(H2O)/n(KOH) of 1.5 starting from Fe(NO3)3 ⋅ 9H2O, TeO2 and H2O2 at about 200 °C. By using (NH4)2TeO4 instead of TeO2, a fine powder consisting of microcrystalline spheres of K12+6xFe6Te4−xO27 was obtained. K12+6xFe6Te4−xO27 crystallizes in the acentric cubic space group Iurn:x-wiley:09476539:media:chem202102464:chem202102464-math-0001 3d. [FeIIIO5] pyramids share their apical atoms in [Fe2O9] groups and two of their edges with [TeVIO6] octahedra to form an open framework that consists of two loosely connected, but not interpenetrating, chiral networks. The flexibility of the hinged oxometalate network manifests in a piezoelectric response similar to that of LiNbO3.The potassium cations are mobile in channels that run along the <111> directions and cross in cavities acting as nodes. The ion conductivity of cold-pressed pellets of ball-milled K12+6xFe6Te4−xO27 is 2.3×10^(−4) S ⋅ cm^(−1) at room temperature. Magnetization measurements and neutron diffraction indicate antiferromagnetic coupling in the [Fe2O9] groups.
AU - Albrecht, Ralf
AU - Hoelzel, Markus
AU - Beccard, Henrik
AU - Rüsing, Michael
AU - Eng, Lukas
AU - Doert, Thomas
AU - Ruck, Michael
ID - 47977
IS - 57
JF - Chemistry – A European Journal
KW - General Chemistry
KW - Catalysis
KW - Organic Chemistry
SN - 0947-6539
TI - Potassium Ion Conductivity in the Cubic Labyrinth of a Piezoelectric, Antiferromagnetic Oxoferrate(III) Tellurate(VI)
VL - 27
ER -
TY - JOUR
AB - Domain walls (DWs) in ferroelectric (FE) and multiferroic materials possess an ever-growing potential as integrated functional elements, for instance in optoelectronic nanodevices. Mandatory, however, is the profound knowledge of the local-scale electronic and optical properties, especially at DWs that are still incompletely characterized to date. Here, we quantify the refractive index of individual FE DWs in periodically-poled LiNbO3 (PPLN) single crystals. When applying polarization-sensitive optical coherence tomography (PS-OCT) at 1300 nm using circular light polarization, we are able to probe the relevant electro-optical properties close to and at the DWs, including also their ordinary and extraordinary contributions. When comparing to numerical calculations, we conclude that the DW signals recorded for ordinary and extraordinary polarization stem from an increased refractive index of at least Δn > 2·10−3 that originates from a tiny region of < 30 nm in width. PS-OCT hence provides an extremely valuable tool to decipher and quantify subtle changes of refractive index profiles for both inorganic and biomedical nanomaterial systems.
AU - Golde, Jonas
AU - Rüsing, Michael
AU - Rix, Jan
AU - Eng, Lukas M.
AU - Koch, Edmund
ID - 47974
IS - 21
JF - Optics Express
KW - Atomic and Molecular Physics
KW - and Optics
SN - 1094-4087
TI - Quantifying the refractive index of ferroelectric domain walls in periodically poled LiNbO3 single crystals by polarization-sensitive optical coherence tomography
VL - 29
ER -
TY - JOUR
AB - Broadband coherent anti-Stokes Raman scattering (B-CARS) has emerged in recent years as a promising chemosensitive high-speed imaging technique. B-CARS allows for the detection of vibrational sample properties in analogy to spontaneous Raman spectroscopy, but also makes electronic sample environments accessible due to its resonant excitation mechanism. Nevertheless, this technique has only gained interest in the biomedical field so far, whereas CARS investigations on solid-state materials are rare and concentrate on layered, two-dimensional materials such as graphene and hexagonal boron nitride . In this work, we discuss the specific properties of this technique when applied to single-crystalline samples, with respect to signal generation, phase matching, and selection rules in the model systems lithium niobate and lithium tantalate. Via polarized B-CARS measurements and subsequent phase retrieval, we validate the predicted selection rules, unequivocally assign the phonons of the A1(TO), E(TO) and A1(LO) branches to the detected CARS peaks, and address differences in spontaneous Raman spectroscopy concerning peak frequencies and scattering efficiencies. We thus establish this technique for future investigations of solid-state materials, specifically in the field of ferroelectric single crystals.
AU - Hempel, Franz
AU - Reitzig, Sven
AU - Rüsing, Michael
AU - Eng, Lukas M.
ID - 47979
IS - 22
JF - Physical Review B
SN - 2469-9950
TI - Broadband coherent anti-Stokes Raman scattering for crystalline materials
VL - 104
ER -
TY - JOUR
AB - BACKGROUND: Previous studies suggest better visual-spatial processing when participants are tested in postures in which dynamic stability is challenged. The question arises if this is also true for the performance in mental body-rotation tasks (MBRT).
AIM: Taking the embodied cognition approach into account, the first aim of the present study was to examine the potential influence of different demands on dynamic stability for two postures (parallel stand vs. tandem stand) on solving two versions of the MBRT, inducing either an object-based or an egocentric perspective transformation strategy. The second aim was to investigate if these different demands on dynamic stability are reflected in postural sway parameters.
METHOD: Thirty participants (18 females and 12 males) were tested in the two MBRTs and in a control condition. All tasks were performed while standing on a balance beam in tandem stand and in a feet parallel position on a force plate.
RESULTS: The results for response time and response error revealed effects of rotation angle and task, but no effect of posture. The analyzed Center of Pressure (CoP) data revealed a reduction of body sway during the MBRT for egocentric perspective transformations.
CONCLUSION: The results indicate that participants performed better for egocentric than for object-based transformations and that the egocentric transformation leads to more postural stability than the object-based.
AU - Budde, Kirsten
AU - Jöllenbeck, Thomas
AU - Barela, José A.
AU - Figueiredo, Gabriella A.
AU - Weigelt, Matthias
ID - 48035
IS - 3
JF - Brazilian Journal of Motor Behavior
SN - 2446-4902
TI - Mental body rotation with egocentric and object-based transformations in different postures: standing vs. balancing
VL - 15
ER -
TY - GEN
AU - Budde, Kirsten
AU - Barela, José A
AU - Figueiredo, Gabriella A
AU - Weigelt, Matthias
ED - Huckauf, Anke
ED - Baumann, Martin
ED - Ernst, Marc
ED - Herbert, Cornelia
ED - Kiefer, Markus
ED - Sauter, Marian
ID - 48037
T2 - TeaP 2021 - Abstracts of the 63rd Conference of Experimental Psychologists.
TI - Mental body rotation with egocentric and object-based transformations in different postures: sitting vs. standing.
ER -
TY - JOUR
AU - Han, Daxin
AU - Yang, Keke
AU - Meschut, Gerson
ID - 37822
JF - Journal of Materials Processing Technology
KW - Industrial and Manufacturing Engineering
KW - Metals and Alloys
KW - Computer Science Applications
KW - Modeling and Simulation
KW - Ceramics and Composites
SN - 0924-0136
TI - Mechanical joining of glass fibre reinforced polymer (GFRP) through an innovative solid self-piercing rivet
VL - 296
ER -
TY - JOUR
AB - AbstractIn this paper, we will describe an introduction to Data Science for secondary school students. We will report on the design and implementation of an introductory unit on “Data and data detectives with CODAP” in which secondary school students used the online tool CODAP to explore real and meaningful survey data on leisure time activities and media use (so‐called JIM‐PB data) in a statistical project setting as a starting point for data science. The JIM‐PB data set served as a valuable data set that offered meaningful and exciting opportunities for data exploration for secondary school students, and CODAP proved to be a valuable tool for the first explorations of this data.
AU - Frischemeier, Daniel
AU - Biehler, Rolf
AU - Podworny, Susanne
AU - Budde, Lea
ID - 48109
IS - S1
JF - Teaching Statistics
KW - Education
KW - Statistics and Probability
SN - 0141-982X
TI - A first introduction to data science education in secondary schools: Teaching and learning about data exploration with CODAP using survey data
VL - 43
ER -
TY - CHAP
AU - Frischemeier, Daniel
AU - Podworny, Susanne
AU - Biehler, Rolf
ID - 48110
SN - 2197-8751
T2 - Konzepte und Studien zur Hochschuldidaktik und Lehrerbildung Mathematik
TI - Integration fachwissenschaftlicher und fachdidaktischer Komponenten in der Lehramtsausbildung Mathematik Grundschule am Beispiel einer Veranstaltung zur Leitidee „Daten, Häufigkeit und Wahrscheinlichkeit“
ER -
TY - CONF
AU - Höper, Lukas
AU - Podworny, Susanne
AU - Hüsing, Sven
AU - Schulte, Carsten
AU - Fleischer, Yannik
AU - Biehler, Rolf
AU - Frischemeier, Daniel
AU - Malatyali, Hülya
ID - 48162
SN - 978-3-88579-707-4
TI - Zur neuen Bedeutung von Daten in Data Science und künstlicher Intelligenz
ER -
TY - CONF
AU - Habernal, Ivan
ID - 48286
T2 - Proceedings of the 2021 Conference on Empirical Methods in Natural Language Processing
TI - When differential privacy meets NLP: The devil is in the detail
ER -
TY - CONF
AB - Phase-shift modulated full bridge converters suffer from thermal imbalances of the inverter switches. The lagging leg switches are subject to larger commutation currents compared to those of the leading leg as the transformer current reduces in the freewheeling interval. Furthermore, after this interval, the energy in the series inductance may not be large enough to achieve zero-voltage switching (ZVS) for the leading leg. Both effects result in thermal imbalances. This paper analyzes the alternating-asymmetrical phase-shift modulation to achieve balanced conduction and switching losses for all four switches while showing that this modulation is easily implemented on standard DSPs. The modulation has been implemented to LLC converters where experimental measurement results proved its effectiveness for LLC converters by reducing the temperature deviation from 6.3 K to only 0.2 K such that the peak temperature is reduced from 95 °C to 92 °C. The paper also proves that the modulation can be utilized to improve the efficiency of LLC converters operated at very low gains while simultaneously reducing the junction temperature of all four switches compared to the conventional complementary modulation. Finally, EMI implications are analyzed, which show that the modulation may be beneficial for reducing the common-mode emissions around the operating frequency.
AU - Rehlaender, Philipp
AU - Unruh, Roland
AU - Schafmeister, Frank
AU - Böcker, Joachim
ID - 29893
KW - Phase-Shifted Full Bridge
KW - Full-Bridge Converter
KW - Phase-Shift Control
KW - Phase-Shift Modulation
KW - LLC Converter
KW - Thermal Balancing
SN - 978-1-7281-8950-5
T2 - 2021 IEEE Applied Power Electronics Conference and Exposition (APEC)
TI - Alternating Asymmetrical Phase-Shift Modulation for Full-Bridge Converters with Balanced Switching Losses to Reduce Thermal Imbalances
ER -
TY - JOUR
AB - ZusammenfassungZu den ersten geometrischen Begriffen, die Kinder bereits im Elementar- und Primarbereich lernen, zählen u. a. Viereck, Rechteck und Quadrat. Studien zeigen, dass Lernende bereits früh individuelle Vorstellungen, sog. individuelle Begriffskonzepte, zu diesen Begriffen aufbauen. Zwar wird die Entwicklung von Begriffsverständnis in verschiedenen mathematikdidaktischen Stufenmodellen dargestellt, diese sind jedoch generisch und beschreiben nicht explizit die Entwicklung der ersten individuellen Begriffskonzepte von Lernenden zu Viereck, Rechteck und Quadrat. Aus empirischer Sicht liegen verschiedene Studien vor, die einzelne Aspekte der individuellen Begriffskonzepte von Lernenden unterschiedlicher Altersgruppen zu diesen Begriffen ausleuchten. Um Begriffsbildungsprozesse aus empirischer Sicht detaillierter entlang der jeweils vorherrschenden individuellen Begriffskonzepte zu beschreiben, fehlen insbesondere Studien in der Grundschule, die alle vier Klassenstufen betrachten und dabei differenzierte Erkenntnisse zu verschiedenen theoretischen Indikatoren des Begriffsverständnisses liefern. Daher geht die vorliegende Studie der Frage nach, welches Verständnis der Begriffe Viereck, Rechteck und Quadrat Schülerinnen und Schüler der Jahrgangsstufen 1, 2, 3 und 4 zeigen. Dazu wurde eine Quasi-Längsschnittstudie mit N = 456 Grundschulkindern (ca. 100 pro Jahrgangsstufe) durchgeführt. Die Ergebnisse geben detaillierte Einblicke in die individuellen Begriffskonzepte der Lernenden und zeigen, dass Lernende zunehmend Eigenschaften der Figuren berücksichtigen, jedoch individuelle Begriffskonzepte über lange Zeit auch prototypisch geprägt sind. Implikationen dieser Ergebnisse für Forschung und Praxis werden diskutiert.
AU - Bruns, Julia
AU - Unterhauser, Elisabeth
AU - Gasteiger, Hedwig
ID - 34827
IS - 2
JF - Journal für Mathematik-Didaktik
KW - Education
KW - General Mathematics
SN - 0173-5322
TI - Geometrisches Begriffsverständnis in der Grundschule am Beispiel der Begriffe Viereck, Rechteck und Quadrat
VL - 42
ER -
TY - CHAP
AU - Jacke, Christoph
ED - Keuchen, Marion
ED - Janus, Richard
ID - 48461
T2 - Musik als Lebensmittel. Kulturwissenschaftlich-theologische Rationen für ein Jahr.
TI - Tocotronic - Hoffnung (2020).
ER -
TY - JOUR
AB - Family-Literacy-Programme stellen eine gute Möglichkeit dar, Eltern in Bildungsprozesse
einzubeziehen. Am Beispiel des Programms „LIFE – Lesen in Familie erleben“ wird
die Wirkung auf elterliche Unterstützung beim Lesenlernen von Erstklässler*innen unter Einbezug von Eltern- und Kinderperspektive untersucht. Sowohl direkt nach dem
Programm als auch ein halbes Jahr später wirkte das Programm positiv auf verschiedene
Arten der Anschlusskommunikation beim gemeinsamen Lesen.
AU - Bonanati, Sabrina
AU - Gruchel, Nicole
AU - Kurock, Ricarda
AU - Buhl, Heike M.
ID - 32562
IS - 3
JF - Die Deutsche Schule
KW - Kooperation
KW - Familie
KW - Lesekompetenz
KW - Längsschnittstudie
KW - Intervention
SN - 0012-0731
TI - Teilhabe von Eltern an schulischem Lernen mit Family-Literacy-Programmen. Langzeiteffekte von „LIFE – Lesen in Familie erleben“ auf die elterliche Unterstützung beim Lesenlernen
VL - 113
ER -
TY - CHAP
AU - Limpinsel, Inga
AU - Engemann, Mario
AU - Neuberger, Olga
AU - Serova, Katja
AU - Aßmann, Sandra
ED - Kunze, Katharina
ED - Petersen, Dorthe
ED - Bellenberg, Gabriele
ED - Fabel-Lamla, Melanie
ED - Hinzke, Jan-Hendrik
ED - Moldenhauer, Anna
ED - Peukert, Lena
ED - Reintjes, Christian
ED - te Poel, Kathrin
ID - 43412
T2 - Kooperation - Koordination - Kollegialität. Befunde und Diskurse zum (multi-)professionellen Zusammenwirken pädagogischer Akteur*innen an Schulen
TI - Schule und außerschulische Bildungspartner an der Schnittstelle von formalen und non-formalen Bildungsprozessen - Empirische Befunde zur Kooperation und professionellen Handlungskompetenz
ER -
TY - CHAP
AU - Engemann, Mario
AU - Herzig, Bardo
ED - Maurer, Christian
ED - Rincke, Karsten
ED - Hemmer, Michael
ID - 43414
T2 - Fachliche Bildung und digitale Transformation - Fachdidaktische Forschung und Diskurse. Fachtagung der Gesellschaft für Fachdidaktik 2020
TI - Lehrerkooperation und Digitalisierung - Gestaltung digital-kooperativer Arbeitsbeziehungen von Lehrkräften und ReferendarInnen am Beispiel des Schulfachs Pädagogik
ER -
TY - CONF
AU - Engemann, Mario
AU - Herzig, Bardo
ID - 43415
TI - Lehrerkooperation vor dem Hintergrund der Digitalisierung: Eine Untersuchung innerhalb von Fachkollegien im gymnasialen Schulfach Pädagogik
ER -
TY - JOUR
AB - Evaluators’ fit assessments are not only influenced by applicants’ qualities, but also by stereotypes, especially in recruitment for high‐status jobs in male‐dominated fields. The unidimensional agentic stereotype of these work contexts signals agentic job and organizational requirements (stereotypically male qualities such as achievement orientation), although the actual requirements usually also include communality (stereotypically female qualities such as interpersonal skills). In five experiments, we investigate the relevance of perceived applicant agency for perceived applicant fit, the influence of recruitment material, contextual differences, and the role of applicant gender. Our findings indicate that perceived applicant agency drives perceived person‐job and person‐organization fit in strictly male stereotyped work contexts, regardless of gender, and agentic recruitment material enhances this effect. Contrasting different contexts (high‐ with low‐status jobs and a male‐dominated with a gender‐balanced and female‐dominated field) revealed that the relevance of perceived agency increases with perceived job status, and the relevance of perceived communality decreases with the expected share of men. Although women were perceived as highly agentic in strictly male stereotyped work contexts, their need to be perceived as agentic also was higher than for men, due to the perceived lack of fit between women and high‐status jobs.
AU - Dutz, Regina
AU - Hubner-Benz, Sylvia
AU - Peus, Claudia
ID - 48513
IS - 2
JF - Personnel Psychology
KW - Organizational Behavior and Human Resource Management
KW - Applied Psychology
SN - 0031-5826
TI - When agency “fits” regardless of gender: Perceptions of applicant fit when job and organization signal male stereotypes
VL - 75
ER -
TY - JOUR
AB - This paper introduces narratives in entrepreneurial ecosystems as drivers of effectuation vs. causation. Drawing on 43 interviews with successful players in Silicon Valley, Munich, and Singapore, we found ecosystem-specific narratives indicate what is common, appropriate, and successful in each ecosystem, and these narratives encourage either effectuation or causation. Our findings indicate that the narratives in the ecosystem in Silicon Valley facilitate effectuation, in Munich causation, and in Singapore a cautious balance of both. Our research suggests that narratives can explain mechanisms how ecosystems influence entrepreneurship: the national culture, market characteristics, available resources, and networks in an ecosystem spark ecosystem-specific narratives, which in turn shape tendencies towards effectuation and causation. Thereby, we introduce a new ecosystem-focused perspective on predictors of effectuation and causation.
AU - Hubner-Benz, Sylvia
AU - Most, Fabian
AU - Wirtz, Jochen
AU - Auer, Christine
ID - 48514
IS - 1
JF - Small Business Economics
KW - Economics and Econometrics
KW - General Business
KW - Management and Accounting
SN - 0921-898X
TI - Narratives in entrepreneurial ecosystems: drivers of effectuation versus causation
VL - 59
ER -
TY - JOUR
AU - Schroeter-Wittke, Harald
ID - 41094
IS - 129
JF - Magazin für Theologie und Ästhetik. (https://www.theomag.de/129/hsw22.pdf)
TI - Weder - Noch. Was mich theologisch prägt
ER -
TY - JOUR
AU - Prediger, Susanne
AU - Dröse, Jennifer
ID - 45382
JF - Lernen und Lernstörungen, 10(2)
TI - Fehlerbearbeitung bei mathematischen Textaufgaben – Sprachliche und strategische Fehlerursachen und ihre Bearbeitung
ER -
TY - GEN
AU - Kruse, Stephan
AU - Scheytt, J. Christoph
ID - 48630
TI - System mit optischer Trägerverteilung
ER -
TY - GEN
AU - Kruse, Stephan
AU - Scheytt, J. Christoph
ID - 48629
TI - Elektrooptischer Regelkreis
ER -
TY - CONF
AU - Engemann, Mario
AU - Gather, Katharina
AU - Martin, Alexander
ID - 43417
TI - Fälle als Reflexionsanlass im Unterricht: Theoretische und empirische Zugänge zur Fallarbeit als Methode im Schulfach Erziehungswissenschaft
ER -
TY - JOUR
AB - AbstractThe present study examines if the neural signature of information processing in mental rotation tasks is moderated by stimulus characteristics (e.g., body‐related vs. non‐body‐related stimuli). In the present experiment, stimulus sets of human figures (back view; left vs. right arm abduction) and alphanumeric characters (‘R’; normal vs. mirrored view) were scrutinized with event‐related potentials (ERPs) in the electroencephalography (EEG). Participants had to judge parity between an upright (0° orientation) and a comparison stimulus (stimulus disparity; 0°, 45°, 90°, 135° or 180°). There was a main effect of stimulus disparity for the behavioural (response time and error rates), as well as for the neural data (rotation‐related negativity, RRN). The interaction of stimulus disparity and stimulus type was significant for the RRN, but not for the response time. Lower RRN amplitudes for letters indicate a more pronounced use of alternative processes (e.g., memory retrieval), which seems to be reflected in higher N350 amplitudes. Moreover, the increase of the RRN amplitude and the increase in response time as a function of disparity were positively correlated. Task differences were evident for several ERP components (i.e., N150, P150 and N250), being independent of disparity, which might reflect differences in early and late object cognition prior to the mental rotation process itself. This might be associated with the task‐dependent activation of embodied cognition processes in mental rotation tasks.
AU - Krause, Daniel
AU - Richert, Benjamin
AU - Weigelt, Matthias
ID - 48699
IS - 4
JF - European Journal of Neuroscience
KW - General Neuroscience
SN - 0953-816X
TI - Neurophysiology of embodied mental rotation: Event‐related potentials in a mental rotation task with human bodies as compared to alphanumeric stimuli
VL - 54
ER -
TY - JOUR
AU - Margraf, Linda
AU - Krause, Daniel
AU - Weigelt, Matthias
ID - 48701
JF - Neuroscience
KW - General Neuroscience
SN - 0306-4522
TI - Valence-dependent neural correlates of augmented feedback processing in extensive motor sequence learning – Part II: Predictive value of event-related potentials for behavioral adaptation and learning
VL - 486
ER -
TY - JOUR
AU - Friehs, Maximilian A.
AU - Whelan, Eric
AU - Güldenpenning, Iris
AU - Krause, Daniel
AU - Weigelt, Matthias
ID - 48698
JF - Psychology of Sport and Exercise
KW - Applied Psychology
SN - 1469-0292
TI - Stimulating performance: A scoping review on transcranial electrical stimulation effects on olympic sports
VL - 59
ER -
TY - JOUR
AU - Margraf, Linda
AU - Krause, Daniel
AU - Weigelt, Matthias
ID - 48700
JF - Neuroscience
KW - General Neuroscience
SN - 0306-4522
TI - Valence-dependent Neural Correlates of Augmented Feedback Processing in Extensive Motor Sequence Learning – Part I: Practice-related Changes of Feedback Processing
VL - 486
ER -
TY - CONF
AU - Wehde, Janis
AU - Bloh, Bea
ID - 27998
TI - Die Förderung demokratischer Grundhaltungen als Teil professioneller Kompetenz angehender Lehrpersonen: Darstellung eines Forschungsvorhabens
ER -
TY - JOUR
AU - Bloh, Bea
AU - Wehde, Janis
ID - 28684
IS - 96
JF - Lernende Schule
TI - Salutogenes Leitungshandeln. Ein Ansatz zur Gesundheitsförderung und Qualitätsentwicklung in der Schule.
ER -
TY - THES
AB - Die Zeitzeug*innenbefragung gilt als kindgemäßer Zugang zur Alltags- und Zeitgeschichte. Sie charakterisiert sich sowohl als geschichtswissenschaftliche Forschungsmethode als auch Unterrichtsmethode zur Erstellung, Bearbeitung und Interpretation historischer Quellen mittels Erinnerungsinterviews zu vergangenen Erlebnissen und Erfahrungen (vgl. Michalik 2017, Schreiber 2009). Trotz einer bildungspolitischen Empfehlung der Methode der Zeitzeug*innenbefragung ab dem Anfangsunterricht des Sachunterrichts (vgl. u.a. Niedersächsisches Kultusministerium 2017), standen bislang im (inter-)nationalen Raum Studien, die die Zeitzeug*innenbefragung als didaktisches Arrangement historischen Lernens im Sachunterricht untersuchen sowie die Kinderperspektive auf die Methode der Zeitzeug*innenbefragung erfassen, aus. Entsprechend fokussiert die vorliegende, explorative und qualitativ angelegte Studie die Präkonzepte von Grundschulkindern zur Methode der Zeitzeug*innenbefragung. Mittels leitfadengestützter teilstandardisierter Einzelinterviews wurden die Präkonzepte zur Methode sowie zum Wissenschaftsverständnis bezüglich Zeitzeug*innen als historische Quelle rekonstruiert (vgl. Fuhs 2012, Helfferich 2011). Das Sample setzte sich aus Grundschulkindern der zweiten und vierten Klasse zusammen. Zur Bearbeitung und Auswertung des Datenmaterials diente eine in Anlehnung an die Lehr- und Lernforschung adaptierte Vorgehensweise der Qualitativen Inhaltsanalyse, die entsprechend modifiziert und erweitert wurde (vgl. Kuckartz 2018). Die Befunde der Studie zeigen differenzierte Präkonzepte der interviewten Zweit- und Viertklässler*innen zum Kontext der Methode der Zeitzeug*innenbefragung auf. Im Weiteren verweisen die Befunde darauf, dass die Zeitzeug*innenbefragung als Unterrichtsmethode ihre Legitimation im historischen Lernen mit Beginn des Anfangsunterrichts in der Grundschule hat.
AU - Diederich, Julia
ID - 48756
KW - Präkonzepte
KW - Zeitzeugenbefragung
KW - Historisches Lernen
KW - Sachunterricht
KW - qualitative Forschung
TI - Präkonzepte von Grundschulkindern zur Zeitzeug*innenbefragung – Eine empirische Untersuchung zu Kompetenzen historischen Denkens
ER -
TY - CHAP
AU - Diederich, Julia
ED - Buchberger, Wolfgang
ED - Kühberger, Christoph
ID - 48773
SN - 978-3-7065-6012-2
T2 - Historisches Lernen in der Primarstufe. Standpunkte – Herausforderungen – Perspektiven
TI - Die Zeitzeugenbefragung aus der Sicht von Grundschulkindern
VL - 13
ER -
TY - CHAP
AU - Luft, Sebastian
ED - Hartung, G
ID - 48810
T2 - Simmel-Handbuch
TI - Simmels Abhandlungen zu Kant
ER -
TY - BOOK
ED - Luft, Sebastian
ED - Ferrari, Massimo
ID - 48906
KW - General Medicine
SN - 2626-8329
TI - Cassirer’s Children, Special Topics Issue
VL - 2(1)
ER -
TY - BOOK
ED - Luft, Sebastian
ED - Bohr, Jörn
ID - 48907
TI - Wilhelm Windelband. Präludien
ER -
TY - CONF
AB - Automatic transcription of meetings requires handling of overlapped speech, which calls for continuous speech separation (CSS) systems. The uPIT criterion was proposed for utterance-level separation with neural networks and introduces the constraint that the total number of speakers must not exceed the number of output channels. When processing meeting-like data in a segment-wise manner, i.e., by separating overlapping segments independently and stitching adjacent segments to continuous output streams, this constraint has to be fulfilled for any segment. In this contribution, we show that this constraint can be significantly relaxed. We propose a novel graph-based PIT criterion, which casts the assignment of utterances to output channels in a graph coloring problem. It only requires that the number of concurrently active speakers must not exceed the number of output channels. As a consequence, the system can process an arbitrary number of speakers and arbitrarily long segments and thus can handle more diverse scenarios.
Further, the stitching algorithm for obtaining a consistent output order in neighboring segments is of less importance and can even be eliminated completely, not the least reducing the computational effort. Experiments on meeting-style WSJ data show improvements in recognition performance over using the uPIT criterion.
AU - von Neumann, Thilo
AU - Kinoshita, Keisuke
AU - Boeddeker, Christoph
AU - Delcroix, Marc
AU - Haeb-Umbach, Reinhold
ID - 26770
KW - Continuous speech separation
KW - automatic speech recognition
KW - overlapped speech
KW - permutation invariant training
T2 - Interspeech 2021
TI - Graph-PIT: Generalized Permutation Invariant Training for Continuous Separation of Arbitrary Numbers of Speakers
ER -
TY - CONF
AU - von Neumann, Thilo
AU - Boeddeker, Christoph
AU - Kinoshita, Keisuke
AU - Delcroix, Marc
AU - Haeb-Umbach, Reinhold
ID - 29173
T2 - Speech Communication; 14th ITG Conference
TI - Speeding Up Permutation Invariant Training for Source Separation
ER -
TY - JOUR
AB - AbstractInnovation projects are characterized by numerous uncertainties. Typical concepts in development management like the application of safety coefficients imply limitations of the solution space. In contrast, explicit handling of uncertainties can support engineers in understanding the problem space and in utilising the full potential of the design space along iterative product development steps. As a result from literature analysis, there is a lack of a support for product development that addresses the specific problem of uncertainty and risk in the context of requirement changes. The aim of the contribution at hand is to enhance the efficient development of complex interdisciplinary systems by enabling uncertainty handling in requirements change management. Based on a classification of uncertainty types resulting in a descriptive model, risk management measures are identified to support requirements engineers. The proposed method includes identification & modelling, analysis, treatment and monitoring of risks and counter-measures. By applying this method, engineers are supported in adopting agile approaches and enabling flexible Requirements Engineering.
AU - Gräßler, Iris
AU - Pottebaum, Jens
AU - Oleff, Christian
AU - Preuß, Daniel
ID - 24037
JF - Proceedings of the Design Society
SN - 2732-527X
TI - Handling of explicit Uncertainty in Requirements Change Management
VL - 1
ER -
TY - CONF
AU - Gürtler, Marius
AU - Mandischer, Nils
AU - Hüsing, Mathias
AU - Corves, Burkhard
AU - Pottebaum, Jens
AU - Roesmann, Daniel
AU - Gräßler, Iris
ID - 23401
T2 - 7. IFToMM D-A-CH Konferenz 2021; 18. - 19. Feb. 2021 IFToMM D-A-CH
TI - Ein reaktiver Modellierungsansatz für Mensch-Roboter-Kollaboration in Rettungs- und Brandszenarien der Feuerwehr
ER -
TY - CONF
AU - Gräßler, Iris
AU - Pottebaum, Jens
AU - Roesmann, Daniel
AU - Mandischer, Nils
AU - Gürtler, Marius
AU - Hüsing, Mathias
AU - Corves, Burkhard
ED - Wienrich, C.
ED - Wintersberger, P.
ED - Weyers, B.
ID - 25534
T2 - Mensch und Computer 2021 - Workshopband
TI - Fähigkeitsorientierte Aufgabenzuordnung für die Mensch-Roboter-Kollaboration in sicherheitskritischen Einsatzsituationen
ER -
TY - CONF
AU - Gräßler, Iris
AU - Roesmann, Daniel
AU - Pottebaum, Jens
ID - 23511
T2 - 14th CIRP Conference on Intelligent Computation in Manufacturing Engineering; 15. - 17. Jul. 2020
TI - Model based Integration of Human Characteristics in Production Systems: A Literature Survey
ER -
TY - JOUR
AU - Gräßler, Iris
AU - Pottebaum, Jens
ID - 23390
JF - Applied Sciences
TI - Generic Product Lifecycle Model: A Holistic and Adaptable Approach for Multi-Disciplinary Product-Service Systems
VL - 11
ER -
TY - CHAP
AU - Schulze, Max
ID - 48953
KW - Sigmar Polke
KW - Bildstörung
KW - Camouflage
KW - Wandfarbe
SN - 9783954764259
T2 - Produktive Bildstörung: Sigmar Polke und aktuelle künstlerische Positionen
TI - Couleur Locale
ER -
TY - BOOK
AU - Werbick, Regina
AU - Höink, Dominik
AU - Memering, Robert
ID - 36450
TI - Friedrich Schneider, Christus das Kind. Oratorium in drei Teilen
ER -
TY - GEN
AB - Merging a sample of 492 merger and acquisition (M&A) announcements from 284 acquiring firms across Europe and North America with data from 5-year single-name credit default swaps (CDSs) written on stock-listed acquiring firms between 2005 and 2018, the paper at hand empirically analyzes the CDS investors’ risk perceptions of M&A announcements using event study methodologies. As a baseline result, we provide evidence for significantly positive cumulative average abnormal CDS spread changes for both, European and North American acquirers suggesting that CDS investors perceive an increase in the acquiring firms’ credit risk exposures due to M&A announcements. Our baseline finding holds under several robustness checks, especially when controlling for the robustness of the empirical design. Moreover, results from a large variety of sensitivity analyses reveal a number of deal and firm characteristics that may explain why CDS investors from our sample expect an increase in the acquirers’ credit risk exposures due to forthcoming M&A transactions.
AU - Hippert, Benjamin
AU - Uhde, André
ID - 36060
KW - credit default swaps
KW - risk perception of CDS investors
KW - mergers and acquisitions
KW - event study
TI - CDS Investors’ Risk Perceptions of M&A Announcements
ER -
TY - GEN
AB - This paper empirically investigates determinants of the outstanding net notional amount
of credit default swaps (CDSs) contracts written on banks. We extend and complement the
previous literature dealing with CDS trading by analyzing a comprehensive set of CDS tradingspecific,
bank-fundamental, macroeconomic and bank-institutional determinants. We find that
risk hedging clearly dominates an investor’s speculation and arbitrage motive, while the latter,
however, exhibits the strongest impact on the outstanding net notional amount of bank CDSs.
Furthermore, being classified as a G-SIB, being a constituent of the main CDS index and the
equity trading volume may significantly explain changes in the outstanding CDS net notional on
banks. The analysis at hand provides important implications for both academics and practitioners,
since understanding the trading motives of bank CDS investors provides a deeper insight into the
opaque CDS market.
AU - Hippert, Benjamin
AU - Uhde, André
AU - Wengerek, Sascha Tobias
ID - 36063
KW - banking
KW - outstanding CDS net notional
KW - determinants of bank CDS trading
TI - Determinants of CDS Trading on Major Banks
ER -