My course is a series, and what is yours?

[EN] Everybody is talking about the newest episodes on Netflix, Amazon Prime or other channels. While the cultural phenomen of a “series” is nothing new, it has never been so popular as today. The “lockdown” era brought more streaming, more time at home and more online teaching. Starting with the idea that our students (and many of our teachers) are now part of the “Netflix generation”, we have been integrating serial elements in education and training. This contribution describes the first experiments of using the elements of a series in teaching. Regardless of whether online and offline teaching, teachers and trainers can use some classical methods of series, such as recaps and cliffhangers, teasers and mysteries to make the courses not only more interesting but also more consistent. Encouraged by the positive results of our experiments, we will be taking the series a step further in the upcoming semester and include elements of an interactive series in our teaching. Together with the students, we will be developing a storyboard outlining the series' episodes throughout the semester.The project #dienetzwerkerinnen is supported by the Austrian Research Promotion Agency (FFG) - Programme Laura Bassi/Frauen gestalten Digitalisierung (www.ffg.at).Pauschenwein, J.; Kühnelt, W.; Podhovnik, E. (2021). My course is a series, and what is yours?. En 7th International Conference on Higher Education Advances (HEAd'21). Editorial Universitat Politècnica de València. 1393-1400. https://doi.org/10.4995/HEAd21.2021.13019OCS1393140

Zirkadiane Verteilung der spike-wave Aktivität bei idiopathisch generalisierten Epilepsien

Retrospektive Analyse von 59 EEGs von Jugendlichen und Kindern mit Idiopathisch generalisierter Epilepsie auf den Einfluss der Vigilanzstadien auf das Vorkommen von spike-waves

School entrance examinations as a small-scale data source for health monitoring of children using obesity as an example

Background: In the scope of the nationwide obligatory school entrance examinations (SEE), a standardised assessment of the preparedness for school of preschool children takes place in the federal states of Germany. For this purpose, height and weight of the children are determined. These data are available in aggregated form at county level, but are not yet being regularly compiled and processed at national level for use in policy and research. Methods: In a pilot project, the indexing and merging of SEE data from 2015–2019 was tested in collaboration with six federal states. This was done using obesity prevalence at the time of the school entrance examination. In addition, prevalences were linked to small-scale indicators on settlement structure and sociodemographics from public databases, differences in obesity prevalence at county level were identified, and correlations to regional influencing factors were visualised. Results: It was feasible to merge SEE data from the federal states with little effort. The majority of the selected indicators were freely available in public databases. In an interactive, easily comprehensible and user-friendly Tableau dashboard for visualising the SEE data, it can be seen that obesity prevalences differ significantly between counties that are similar in terms of settlement structure or sociodemographics. Conclusions: Providing federal state SEE data and linking them to small-scale indicators enables region-based analyses and cross-state comparisons of similar counties and provides a data basis for continuous monitoring of the prevalence of obesity in early childhood

Model-Based Design of High Energy All-Solid-State Li Batteries with Hybrid Electrolytes

As the aircraft industry becomes more committed to sustainable aviation, hybrid-electric propulsion systems containing batteries with higher gravimetric energy density attract increasing attention to reduce fuel consumption. Future aircrafts could benefit from next-generation chemistries like oxide-based all-solid-state Li-battery (ASSB) technologies. However, producing and evaluating a wide range of design parameters for maximising the gravimetric energy density of ASSB experimentally is both time- and resource-intensive. Physics-based modelling promises to identify optimal designs for battery cells with respect to high gravimetric energy density more time and cost-efficient. In this regard, we applied a pseudo-two-dimensional model for the model-based evaluation of Li-ASSB with various hybrid electrolytes containing oxide and polymer electrolytes. This way we elucidate which electrolyte performs well with present technology and which has the potential to become an attractive alternative in the future. After identifying design variables to improve ASSB with the help of sensitivity analysis, a genetic algorithm is used to predict the optimal design parameters to achieve higher gravimetric energy density. The conducted study reveals that ASSB based on 12.7 vol% of garnet Li$_{6.4}$La$_{3}$Zr$_{1.4}$Ta$_{0.6}$O$_{12}$ (LLZTO) is the best option based on present manufacturing constraints. Hybrid electrolytes based on 10 wt% of Li$_{1.3}$Al$_{0.3}$Ti$_{1.7}$(PO$_{4}$) $_{3}$3 (LATP) could be promising for future aircrafts with further improvements in ASSB manufacturing process

Structural Batteries for Aeronautic Applications—State of the Art, Research Gaps and Technology Development Needs

Radical innovations for all aircraft systems and subsystems are needed for realizing future carbon-neutral aircraft, with hybrid-electric aircraft due to be delivered after 2035, initially in the regional aircraft segment of the industry. Electrical energy storage is one key element here, demanding safe, energy-dense, lightweight technologies. Combining load-bearing with energy storage capabilities to create multifunctional structural batteries is a promising way to minimize the detrimental impact of battery weight on the aircraft. However, despite the various concepts developed in recent years, their viability has been demonstrated mostly at the material or coupon level, leaving many open questions concerning their applicability to structural elements of a relevant size for implementation into the airframe. This review aims at providing an overview of recent approaches for structural batteries, assessing their multifunctional performance, and identifying gaps in technology development toward their introduction for commercial aeronautic applications. The main areas where substantial progress needs to be achieved are materials, for better energy storage capabilities; structural integration and aircraft design, for optimizing the mechanical-electrical performance and lifetime; aeronautically compatible manufacturing techniques; and the testing and monitoring of multifunctional structures. Finally, structural batteries will introduce novel aspects to the certification framework

Schuleingangsuntersuchungen als kleinräumige Datenquelle für ein Monitoring der Kindergesundheit am Beispiel Adipositas

Hintergrund: Im Rahmen der bundesweit verbindlichen Schuleingangsuntersuchungen (SEU) findet in den Ländern eine standardisierte Erfassung der Schulreife von Vorschulkindern statt. Dazu werden auch Körpergröße und -gewicht der Kinder bestimmt. Diese Daten liegen aggregiert auf Kreisebene vor, eine regelmäßige Zusammenführung und Aufbereitung auf Bundesebene zur Nutzung für Politik und Forschung erfolgt bisher nicht. Methode: In einem Pilotprojekt wurde in Zusammenarbeit mit sechs Ländern die Erschließung und Zusammenführung von SEU-Daten der Jahre 2015 – 2019 erprobt. Dies erfolgte am Beispiel der Adipositasprävalenz zum Zeitpunkt der Schuleingangsuntersuchung. Zusätzlich wurden die Prävalenzen mit kleinräumigen Indikatoren zu Siedlungsstruktur und Soziodemografie aus öffentlichen Datenbanken verknüpft, Unterschiede in der Adipositasverbreitung auf Kreisebene identifiziert und Zusammenhänge mit regionalen Einflussfaktoren visualisiert. Ergebnisse: Die Zusammenführung der SEU-Daten der Länder war mit geringem Aufwand möglich. Die Mehrheit der ausgewählten Indikatoren war frei in öffentlichen Datenbanken verfügbar. In einem interaktiven, leicht verständlichen und nutzungsfreundlichen Tableau-Dashboard zur Visualisierung der SEU-Daten kann abgelesen werden, dass sich die Adipositasprävalenzen deutlich zwischen siedlungsstrukturell oder soziodemografisch ähnlichen Kreisen unterscheiden. Schlussfolgerungen: Die Bereitstellung der SEU-Daten der Länder und die Verknüpfung mit kleinräumigen Indikatoren ermöglichen regionalisierte Analysen und länderübergreifende Vergleiche ähnlicher Kreise und stellen eine Datengrundlage für ein kontinuierliches Monitoring der Adipositasprävalenz im frühen Kindesalter dar

Separation of Spin and Charge Quantum Numbers in Strongly Correlated Systems

In this paper we reexamine the problem of the separation of spin and charge degrees of freedom in two dimensional strongly correlated systems. We establish a set of sufficient conditions for the occurence of spin and charge separation. Specifically, we discuss this issue in the context of the Heisenberg model for spin-1/2 on a square lattice with nearest ($J_1$) and next-nearest ($J_2$) neighbor antiferromagnetic couplings. Our formulation makes explicit the existence of a local SU(2) gauge symmetry once the spin-1/2 operators are replaced by bound states of spinons. The mean-field theory for the spinons is solved numerically as a function of the ratio $J_2/J_1$ for the so-called s-RVB Ansatz. A second order phase transition exists into a novel flux state for $J_2/J_1>(J_2/J_1)_{{\rm cr}}$. We identify the range $0<J_2/J_1<(J_2/J_1)_{\rm cr}$ as the s-RVB phase. It is characterized by the existence of a finite gap to the elementary excitations (spinons) and the breakdown of all the continuous gauge symmetries. An effective continuum theory for the spinons and the gauge degrees of freedom is constructed just below the onset of the flux phase. We argue that this effective theory is consistent with the deconfinement of the spinons carrying the fundamental charge of the gauge group. We contrast this result with the study of the one dimensional quantum antiferromagnet within the same approach. We show that in the one dimensional model, the spinons of the gauge picture are always confined and thus cannot be identified with the gapless spin-1/2 excitations of the quantum antiferromagnet Heisenberg model.Comment: 56 pages, RevteX 3.

The mechanism of spin and charge separation in one dimensional quantum antiferromagnets

We reconsider the problem of separation of spin and charge in one dimensional quantum antiferromagnets. We show that spin and charge separation in one dimensional strongly correlated systems cannot be described by the slave boson or fermion representation within any perturbative treatment of the interactions between the slave holons and slave spinons. The constraint of single occupancy must be implemented exactly. As a result the slave fermions and bosons are not part of the physical spectrum. Instead, the excitations which carry the separate spin and charge quantum numbers are solitons. To prove this {\it no-go} result, it is sufficient to study the pure spinon sector in the slave boson representation. We start with a short-range RVB spin liquid mean-field theory for the frustrated antiferromagnetic spin-${1\over2}$ chain. We derive an effective theory for the fluctuations of the Affleck-Marston and Anderson order parameters. We show how to recover the phase diagram as a function of the frustration by treating the fluctuations non-perturbatively.Comment: 53 pages; Revtex 3.

Dispersion of the second-order nonlinear susceptibility in ZnTe, ZnSe, and ZnS

We have measured the absolute values of the second-harmonic generation (SHG) coefficient |d| for the zinc-blende II-VI semiconductors ZnTe, ZnSe, and ZnS at room temperature. The investigated spectral region of the fundamental radiation λF ranges from 520 to 1321 nm using various pulsed laser sources. In the transparent region of the II-VI semiconductors, the SHG coefficient exceeds the values of birefringent materials as ammonium dihydrogen phosphate (ADP) and potassium dihydrogen phosphate (KDP) by one or two orders of magnitudes. Above the E0 band gap a strong dispersion of |d| is observed, showing a maximum for a second-harmonic frequency close to the E1 gap. The experimental results are compared to calculated values using a simple three-band model including spin-orbit splitting. Substantial agreement is found to the experimentally observed dispersion of the second-order nonlinear susceptibility