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 -