@techreport{NastanskySiris2024, type = {Working Paper}, author = {Nastansky, Andreas and Siris, Sarah}, title = {Risikoverbund zwischen Banken und Staaten}, series = {Statistische Diskussionsbeitr{\"a}ge}, volume = {56}, journal = {Statistische Diskussionsbeitr{\"a}ge}, doi = {10.25932/publishup-61989}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-619891}, pages = {50}, year = {2024}, abstract = {Die Begrenzung systemischer Risiken ist essentieller Bestandteil der neuen internationalen Finanzmarktordnung. Dabei galt es nicht nur die Verflechtung der Banken untereinander, sondern auch die Verbindung zwischen den Staatsfinanzen und der Solvenz der nationalen Bankensysteme (dem sog. Risikoverbund zwischen Staat und Banken) zu durchbrechen. Der Beitrag beleuchtet die Entwicklung der Forderungen gegen{\"u}ber Staaten in den Bankbilanzen der Eurol{\"a}nder und des Eurosystems im Zeitverlauf sowie den daraus erwachsenden Risiken f{\"u}r die Finanzstabilit{\"a}t. Hierzu werden die Determinanten des Risikoverbunds theoretisch wie empirisch analysiert. Die fiskalische Kapazit{\"a}t der Eurostaaten wird anhand verschiedener Faktoren wie der Verschuldungsquote, dem Leistungsbilanzsaldo und der Kredit-BIP L{\"u}cke aufgezeigt; anschließend werden die Strukturen der Bankensysteme im Euroraum untersucht. Im Einzelnen werden die private und staatliche Gesamtverschuldung, die konsolidierte Bankenbilanzsumme und die darin enthaltenen Verbindlichkeiten sowie der Anteil des Bankensektors an der Bruttowertsch{\"o}pfung in Relation zur Wirtschaftsleistung betrachtet. Außerdem finden NPE-Best{\"a}nde in den Bankbilanzen sowie die Renditen der emittierten Staatsanleihen und damit in Verbindung stehenden CDS-Spreads Betrachtung. Zus{\"a}tzlich werden die Konzentration, der Verschuldungsgrad, Liquidit{\"a}tsziffern sowie l{\"a}nderspezifische Unterschiede in Art und Fristigkeit der Refinanzierung der Bankensektoren abgebildet. Auf Basis der empirischen Befunde werden im Hinblick auf die wechselseitigen Ansteckungseffekte zwischen Banken und Staaten Implikationen f{\"u}r die Finanzmarktregulierung diskutiert.}, language = {de} } @phdthesis{Schifferle2024, author = {Schifferle, Lukas}, title = {Optical properties of (Mg,Fe)O at high pressure}, doi = {10.25932/publishup-62216}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-622166}, school = {Universit{\"a}t Potsdam}, pages = {XIV, 90}, year = {2024}, abstract = {Large parts of the Earth's interior are inaccessible to direct observation, yet global geodynamic processes are governed by the physical material properties under extreme pressure and temperature conditions. It is therefore essential to investigate the deep Earth's physical properties through in-situ laboratory experiments. With this goal in mind, the optical properties of mantle minerals at high pressure offer a unique way to determine a variety of physical properties, in a straight-forward, reproducible, and time-effective manner, thus providing valuable insights into the physical processes of the deep Earth. This thesis focusses on the system Mg-Fe-O, specifically on the optical properties of periclase (MgO) and its iron-bearing variant ferropericlase ((Mg,Fe)O), forming a major planetary building block. The primary objective is to establish links between physical material properties and optical properties. In particular the spin transition in ferropericlase, the second-most abundant phase of the lower mantle, is known to change the physical material properties. Although the spin transition region likely extends down to the core-mantle boundary, the ef-fects of the mixed-spin state, where both high- and low-spin state are present, remains poorly constrained. In the studies presented herein, we show how optical properties are linked to physical properties such as electrical conductivity, radiative thermal conductivity and viscosity. We also show how the optical properties reveal changes in the chemical bonding. Furthermore, we unveil how the chemical bonding, the optical and other physical properties are affected by the iron spin transition. We find opposing trends in the pres-sure dependence of the refractive index of MgO and (Mg,Fe)O. From 1 atm to ~140 GPa, the refractive index of MgO decreases by ~2.4\% from 1.737 to 1.696 (±0.017). In contrast, the refractive index of (Mg0.87Fe0.13)O (Fp13) and (Mg0.76Fe0.24)O (Fp24) ferropericlase increases with pressure, likely because Fe Fe interactions between adjacent iron sites hinder a strong decrease of polarizability, as it is observed with increasing density in the case of pure MgO. An analysis of the index dispersion in MgO (decreasing by ~23\% from 1 atm to ~103 GPa) reflects a widening of the band gap from ~7.4 eV at 1 atm to ~8.5 (±0.6) eV at ~103 GPa. The index dispersion (between 550 and 870 nm) of Fp13 reveals a decrease by a factor of ~3 over the spin transition range (~44-100 GPa). We show that the electrical band gap of ferropericlase significantly widens up to ~4.7 eV in the mixed spin region, equivalent to an increase by a factor of ~1.7. We propose that this is due to a lower electron mobility between adjacent Fe2+ sites of opposite spin, explaining the previously observed low electrical conductivity in the mixed spin region. From the study of absorbance spectra in Fp13, we show an increasing covalency of the Fe-O bond with pressure for high-spin ferropericlase, whereas in the low-spin state a trend to a more ionic nature of the Fe-O bond is observed, indicating a bond weakening effect of the spin transition. We found that the spin transition is ultimately caused by both an increase of the ligand field-splitting energy and a decreasing spin-pairing energy of high-spin Fe2+.}, language = {en} } @phdthesis{Ketzer2024, author = {Ketzer, Laura}, title = {The impact of stellar activity evolution on atmospheric mass loss of young exoplanets}, doi = {10.25932/publishup-62681}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-626819}, school = {Universit{\"a}t Potsdam}, pages = {x, 208}, year = {2024}, abstract = {The increasing number of known exoplanets raises questions about their demographics and the mechanisms that shape planets into how we observe them today. Young planets in close-in orbits are exposed to harsh environments due to the host star being magnetically highly active, which results in high X-ray and extreme UV fluxes impinging on the planet. Prolonged exposure to this intense photoionizing radiation can cause planetary atmospheres to heat up, expand and escape into space via a hydrodynamic escape process known as photoevaporation. For super-Earth and sub-Neptune-type planets, this can even lead to the complete erosion of their primordial gaseous atmospheres. A factor of interest for this particular mass-loss process is the activity evolution of the host star. Stellar rotation, which drives the dynamo and with it the magnetic activity of a star, changes significantly over the stellar lifetime. This strongly affects the amount of high-energy radiation received by a planet as stars age. At a young age, planets still host warm and extended envelopes, making them particularly susceptible to atmospheric evaporation. Especially in the first gigayear, when X-ray and UV levels can be 100 - 10,000 times higher than for the present-day sun, the characteristics of the host star and the detailed evolution of its high-energy emission are of importance. In this thesis, I study the impact of stellar activity evolution on the high-energy-induced atmospheric mass loss of young exoplanets. The PLATYPOS code was developed as part of this thesis to calculate photoevaporative mass-loss rates over time. The code, which couples parameterized planetary mass-radius relations with an analytical hydrodynamic escape model, was used, together with Chandra and eROSITA X-ray observations, to investigate the future mass loss of the two young multiplanet systems V1298 Tau and K2-198. Further, in a numerical ensemble study, the effect of a realistic spread of activity tracks on the small-planet radius gap was investigated for the first time. The works in this thesis show that for individual systems, in particular if planetary masses are unconstrained, the difference between a young host star following a low-activity track vs. a high-activity one can have major implications: the exact shape of the activity evolution can determine whether a planet can hold on to some of its atmosphere, or completely loses its envelope, leaving only the bare rocky core behind. For an ensemble of simulated planets, an observationally-motivated distribution of activity tracks does not substantially change the final radius distribution at ages of several gigayears. My simulations indicate that the overall shape and slope of the resulting small-planet radius gap is not significantly affected by the spread in stellar activity tracks. However, it can account for a certain scattering or fuzziness observed in and around the radius gap of the observed exoplanet population.}, language = {en} } @techreport{BruttelEisenkopfNithammer2024, type = {Working Paper}, author = {Bruttel, Lisa Verena and Eisenkopf, Gerald and Nithammer, Juri}, title = {Pre-election communication in public good games with endogenous leaders}, series = {CEPA Discussion Papers}, journal = {CEPA Discussion Papers}, number = {73}, issn = {2628-653X}, doi = {10.25932/publishup-62395}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-623952}, pages = {28}, year = {2024}, abstract = {Leadership plays an important role for the efficient and fair solution of social dilemmas but the effectiveness of a leader can vary substantially. Two main factors of leadership impact are the ability to induce high contributions by all group members and the (expected) fair use of power. Participants in our experiment decide about contributions to a public good. After all contributions are made, the leader can choose how much of the joint earnings to assign to herself; the remainder is distributed equally among the followers. Using machine learning techniques, we study whether the content of initial open statements by the group members predicts their behavior as a leader and whether groups are able to identify such clues and endogenously appoint a "good" leader to solve the dilemma. We find that leaders who promise fairness are more likely to behave fairly, and that followers appoint as leaders those who write more explicitly about fairness and efficiency. However, in their contribution decision, followers focus on the leader's first-move contribution and place less importance on the content of the leader's statements.}, language = {en} } @techreport{EstrinKhavulKritikosetal.2024, type = {Working Paper}, author = {Estrin, Saul and Khavul, Susanna and Kritikos, Alexander and L{\"o}her, Jonas}, title = {Access to digital finance}, series = {CEPA Discussion Papers}, journal = {CEPA Discussion Papers}, number = {72}, issn = {2628-653X}, doi = {10.25932/publishup-62326}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-623261}, pages = {27}, year = {2024}, abstract = {Financing entrepreneurship spurs innovation and economic growth. Digital financial platforms that crowdfund equity for entrepreneurs have emerged globally, yet they remain poorly understood. We model equity crowdfunding in terms of the relationship between the number of investors and the amount of money raised per pitch. We examine heterogeneity in the average amount raised per pitch that is associated with differences across three countries and seven platforms. Using a novel dataset of successful fundraising on the most prominent platforms in the UK, Germany, and the USA, we find the underlying relationship between the number of investors and the amount of money raised for entrepreneurs is loglinear, with a coefficient less than one and concave to the origin. We identify significant variation in the average amount invested in each pitch across countries and platforms. Our findings have implications for market actors as well as regulators who set competitive frameworks.}, language = {en} } @phdthesis{Littmann2024, author = {Littmann, Daniela-Christin}, title = {Large eddy simulations of the Arctic boundary layer around the MOSAiC drift track}, doi = {10.25932/publishup-62437}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-624374}, school = {Universit{\"a}t Potsdam}, pages = {xii, 110}, year = {2024}, abstract = {The icosahedral non-hydrostatic large eddy model (ICON-LEM) was applied around the drift track of the Multidisciplinary Observatory Study of the Arctic (MOSAiC) in 2019 and 2020. The model was set up with horizontal grid-scales between 100m and 800m on areas with radii of 17.5km and 140 km. At its lateral boundaries, the model was driven by analysis data from the German Weather Service (DWD), downscaled by ICON in limited area mode (ICON-LAM) with horizontal grid-scale of 3 km. The aim of this thesis was the investigation of the atmospheric boundary layer near the surface in the central Arctic during polar winter with a high-resolution mesoscale model. The default settings in ICON-LEM prevent the model from representing the exchange processes in the Arctic boundary layer in accordance to the MOSAiC observations. The implemented sea-ice scheme in ICON does not include a snow layer on sea-ice, which causes a too slow response of the sea-ice surface temperature to atmospheric changes. To allow the sea-ice surface to respond faster to changes in the atmosphere, the implemented sea-ice parameterization in ICON was extended with an adapted heat capacity term. The adapted sea-ice parameterization resulted in better agreement with the MOSAiC observations. However, the sea-ice surface temperature in the model is generally lower than observed due to biases in the downwelling long-wave radiation and the lack of complex surface structures, like leads. The large eddy resolving turbulence closure yielded a better representation of the lower boundary layer under strongly stable stratification than the non-eddy-resolving turbulence closure. Furthermore, the integration of leads into the sea-ice surface reduced the overestimation of the sensible heat flux for different weather conditions. The results of this work help to better understand boundary layer processes in the central Arctic during the polar night. High-resolving mesoscale simulations are able to represent temporally and spatially small interactions and help to further develop parameterizations also for the application in regional and global models.}, language = {en} } @phdthesis{WindirschWoiwode2024, author = {Windirsch-Woiwode, Torben}, title = {Permafrost carbon stabilisation by recreating a herbivore-driven ecosystem}, doi = {10.25932/publishup-62424}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-624240}, school = {Universit{\"a}t Potsdam}, pages = {X, 104, A-57}, year = {2024}, abstract = {With Arctic ground as a huge and temperature-sensitive carbon reservoir, maintaining low ground temperatures and frozen conditions to prevent further carbon emissions that contrib-ute to global climate warming is a key element in humankind's fight to maintain habitable con-ditions on earth. Former studies showed that during the late Pleistocene, Arctic ground condi-tions were generally colder and more stable as the result of an ecosystem dominated by large herbivorous mammals and vast extents of graminoid vegetation - the mammoth steppe. Characterised by high plant productivity (grassland) and low ground insulation due to animal-caused compression and removal of snow, this ecosystem enabled deep permafrost aggrad-ation. Now, with tundra and shrub vegetation common in the terrestrial Arctic, these effects are not in place anymore. However, it appears to be possible to recreate this ecosystem local-ly by artificially increasing animal numbers, and hence keep Arctic ground cold to reduce or-ganic matter decomposition and carbon release into the atmosphere. By measuring thaw depth, total organic carbon and total nitrogen content, stable carbon iso-tope ratio, radiocarbon age, n-alkane and alcohol characteristics and assessing dominant vegetation types along grazing intensity transects in two contrasting Arctic areas, it was found that recreating conditions locally, similar to the mammoth steppe, seems to be possible. For permafrost-affected soil, it was shown that intensive grazing in direct comparison to non-grazed areas reduces active layer depth and leads to higher TOC contents in the active layer soil. For soil only frozen on top in winter, an increase of TOC with grazing intensity could not be found, most likely because of confounding factors such as vertical water and carbon movement, which is not possible with an impermeable layer in permafrost. In both areas, high animal activity led to a vegetation transformation towards species-poor graminoid-dominated landscapes with less shrubs. Lipid biomarker analysis revealed that, even though the available organic material is different between the study areas, in both permafrost-affected and sea-sonally frozen soils the organic material in sites affected by high animal activity was less de-composed than under less intensive grazing pressure. In conclusion, high animal activity af-fects decomposition processes in Arctic soils and the ground thermal regime, visible from reduced active layer depth in permafrost areas. Therefore, grazing management might be utilised to locally stabilise permafrost and reduce Arctic carbon emissions in the future, but is likely not scalable to the entire permafrost region.}, language = {en} } @techreport{KritikosMalirantaNippalaetal.2024, type = {Working Paper}, author = {Kritikos, Alexander and Maliranta, Mika and Nippala, Veera and Nurmi, Satu}, title = {Does gender of firm ownership matter?}, series = {CEPA Discussion Papers}, journal = {CEPA Discussion Papers}, number = {76}, issn = {2628-653X}, doi = {10.25932/publishup-63619}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-636194}, pages = {1 -- 39}, year = {2024}, abstract = {We examine how the gender of business-owners is related to the wages paid to female relative to male employees working in their firms. Using Finnish register data and employing firm fixed effects, we find that the gender pay gap is - starting from a gender pay gap of 11 to 12 percent - two to three percentage-points lower for hourly wages in female-owned firms than in male-owned firms. Results are robust to how the wage is measured, as well as to various further robustness checks. More importantly, we find substantial differences between industries. While, for instance, in the manufacturing sector, the gender of the owner plays no role for the gender pay gap, in several service sector industries, like ICT or business services, no or a negligible gender pay gap can be found, but only when firms are led by female business owners. Businesses in male ownership maintain a gender pay gap of around 10 percent also in the latter industries. With increasing firm size, the influence of the gender of the owner, however, fades. In large firms, it seems that others - firm managers - determine wages and no differences in the pay gap are observed between male- and female-owned firms.}, language = {en} } @phdthesis{Aue2024, author = {Aue, Lars}, title = {Cyclone impacts on sea ice in the Atlantic Arctic Ocean}, doi = {10.25932/publishup-63445}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-634458}, school = {Universit{\"a}t Potsdam}, pages = {VIII, 131}, year = {2024}, abstract = {The Arctic is the hot spot of the ongoing, global climate change. Over the last decades, near-surface temperatures in the Arctic have been rising almost four times faster than on global average. This amplified warming of the Arctic and the associated rapid changes of its environment are largely influenced by interactions between individual components of the Arctic climate system. On daily to weekly time scales, storms can have major impacts on the Arctic sea-ice cover and are thus an important part of these interactions within the Arctic climate. The sea-ice impacts of storms are related to high wind speeds, which enhance the drift and deformation of sea ice, as well as to changes in the surface energy budget in association with air mass advection, which impact the seasonal sea-ice growth and melt. The occurrence of storms in the Arctic is typically associated with the passage of transient cyclones. Even though the above described mechanisms how storms/cyclones impact the Arctic sea ice are in principal known, there is a lack of statistical quantification of these effects. In accordance with that, the overarching objective of this thesis is to statistically quantify cyclone impacts on sea-ice concentration (SIC) in the Atlantic Arctic Ocean over the last four decades. In order to further advance the understanding of the related mechanisms, an additional objective is to separate dynamic and thermodynamic cyclone impacts on sea ice and assess their relative importance. Finally, this thesis aims to quantify recent changes in cyclone impacts on SIC. These research objectives are tackled utilizing various data sets, including atmospheric and oceanic reanalysis data as well as a coupled model simulation and a cyclone tracking algorithm. Results from this thesis demonstrate that cyclones are significantly impacting SIC in the Atlantic Arctic Ocean from autumn to spring, while there are mostly no significant impacts in summer. The strength and the sign (SIC decreasing or SIC increasing) of the cyclone impacts strongly depends on the considered daily time scale and the region of the Atlantic Arctic Ocean. Specifically, an initial decrease in SIC (day -3 to day 0 relative to the cyclone) is found in the Greenland, Barents and Kara Seas, while SIC increases following cyclones (day 0 to day 5 relative to the cyclone) are mostly limited to the Barents and Kara Seas. For the cold season, this results in a pronounced regional difference between overall (day -3 to day 5 relative to the cyclone) SIC-decreasing cyclone impacts in the Greenland Sea and overall SIC-increasing cyclone impacts in the Barents and Kara Seas. A cyclone case study based on a coupled model simulation indicates that both dynamic and thermodynamic mechanisms contribute to cyclone impacts on sea ice in winter. A typical pattern consisting of an initial dominance of dynamic sea-ice changes followed by enhanced thermodynamic ice growth after the cyclone passage was found. This enhanced ice growth after the cyclone passage most likely also explains the (statistical) overall SIC-increasing effects of cyclones in the Barents and Kara Seas in the cold season. Significant changes in cyclone impacts on SIC over the last four decades have emerged throughout the year. These recent changes are strongly varying from region to region and month to month. The strongest trends in cyclone impacts on SIC are found in autumn in the Barents and Kara Seas. Here, the magnitude of destructive cyclone impacts on SIC has approximately doubled over the last four decades. The SIC-increasing effects following the cyclone passage have particularly weakened in the Barents Sea in autumn. As a consequence, previously existing overall SIC-increasing cyclone impacts in this region in autumn have recently disappeared. Generally, results from this thesis show that changes in the state of the sea-ice cover (decrease in mean sea-ice concentration and thickness) and near-surface air temperature are most important for changed cyclone impacts on SIC, while changes in cyclone properties (i.e. intensity) do not play a significant role.}, language = {en} } @techreport{HertelKenneckeReicheetal.2024, author = {Hertel, Kyra and Kennecke, Andreas and Reiche, Michael and Schmidt-Kopplin, Diana and Tillmann, Diana and Winkler, Marco}, title = {Bericht zum Auftaktworkshop des Forschungsprojektes "Workflow-Management-Systeme f{\"u}r Open-Access-Hochschulverlage (OA-WFMS)"}, doi = {10.25932/publishup-63805}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-638057}, year = {2024}, abstract = {Das Forschungsprojekt „Workflow-Management-Systeme f{\"u}r Open-Access-Hochschulverlage (OA-WFMS)" ist eine Kooperation zwischen der HTWK Leipzig und der Universit{\"a}t Potsdam. Ziel ist es, die Bedarfe von Universit{\"a}ts- und Hochschulverlagen und Anforderungen an ein Workflow-Management-Systeme (WFMS) zu analysieren, um daraus ein generisches Lastenheft zu erstellen. Das WFMS soll den Publikationsprozess in OA-Verlagen erleichtern, beschleunigen sowie die Verbreitung von Open Access und das nachhaltige, digitale wissenschaftliche Publizieren f{\"o}rdern. Das Projekt baut auf den Ergebnissen der Projekte „Open-Access-Hochschulverlag (OA-HVerlag)" und „Open-Access-Strukturierte-Kommunikation (OA-STRUKTKOMM)" auf. Der diesem Bericht zugrunde liegende Auftaktworkshop fand 2024 in Leipzig mit Vertreter:innen von zehn Institutionen statt. Der Workshop diente dazu, Herausforderungen und Anforderungen an ein WFMS zu ermitteln sowie bestehende L{\"o}sungsans{\"a}tze und Tools zu diskutieren. Im Workshop wurden folgende Fragen behandelt: a. Wie kann die Organisation und {\"U}berwachung von Publikationsprozessen in wissenschaftlichen Verlagen durch ein WFMS effizient gestaltet werden? b. Welche Anforderungen muss ein WFMS erf{\"u}llen, um Publikationsprozesse optimal zu unterst{\"u}tzen? c. Welche Schnittstellen m{\"u}ssen ber{\"u}cksichtigt werden, um die Interoperabilit{\"a}t der Systeme zu garantieren? d. Welche bestehenden L{\"o}sungsans{\"a}tze und Tools sind bereits im Einsatz und welche Vor- und Nachteile haben diese? Der Workshop gliederte sich in zwei Teile : Teil 1 behandelte Herausforderungen und Anforderungen (Fragen a. bis c.), Teil 2 bestehende L{\"o}sungen und Tools (Frage d.). Die Ergebnisse des Workshops fließen in die Bedarfsanalyse des Forschungsprojekts ein. Die im Bericht dokumentierten Ergebnisse zeigen die Vielzahl der Herausforderungen der bestehenden Ans{\"a}tze bez{\"u}glich des OA-Publikationsmanagements . Die Herausforderungen zeigen sich insbesondere bei der Systemheterogenit{\"a}t, den individuellen Anpassungsbedarfen und der Notwendigkeit der systematischen Dokumentation. Die eingesetzten Unterst{\"u}tzungssysteme und Tools wie Dateiablagen, Projektmanagement- und Kommunikationstools k{\"o}nnen insgesamt den Anforderungen nicht gen{\"u}gen, f{\"u}r Teill{\"o}sungen sind sie jedoch nutzbar. Deshalb muss die Integration bestehender Systeme in ein zu entwickelndes OA-WFMS in Betracht gezogen und die Interoperabilit{\"a}t der miteinander interagierenden Systeme gew{\"a}hrleistet werden. Die Beteiligten des Workshops waren sich einig, dass das OA-WFMS flexibel und modular aufgebaut werden soll. Einer konsortialen Softwareentwicklung und einem gemeinsamen Betrieb im Verbund wurde der Vorrang gegeben. Der Workshop lieferte wertvolle Einblicke in die Arbeit der Hochschulverlage und bildet somit eine solide Grundlage f{\"u}r die in Folge zu erarbeitende weitere Bedarfsanalyse und die Erstellung des generischen Lastenheftes.}, language = {de} } @techreport{BorckMulder2024, type = {Working Paper}, author = {Borck, Rainald and Mulder, Peter}, title = {Energy policies and pollution in two developing country cities}, series = {CEPA Discussion Papers}, journal = {CEPA Discussion Papers}, number = {78}, issn = {2628-653X}, doi = {10.25932/publishup-63847}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-638472}, pages = {37}, year = {2024}, abstract = {We study the effect of energy and transport policies on pollution in two developing country cities. We use a quantitative equilibrium model with choice of housing, energy use, residential location, transport mode, and energy technology. Pollution comes from commuting and residential energy use. The model parameters are calibrated to replicate key variables for two developing country cities, Maputo, Mozambique, and Yogyakarta, Indonesia. In the counterfactual simulations, we study how various transport and energy policies affect equilibrium pollution. Policies may be induce rebound effects from increasing residential energy use or switching to high emission modes or locations. In general, these rebound effects tend to be largest for subsidies to public transport or modern residential energy technology.}, language = {en} } @article{UllrichAbramowicz2023, author = {Ullrich, Rebecca and Abramowicz, Isidoro}, title = {Ein unbekannter Piyyut f{\"u}r Schabbat aus Reckendorf}, series = {Genisa-Bl{\"a}tter IV}, journal = {Genisa-Bl{\"a}tter IV}, publisher = {Universit{\"a}tsverlag Potsdam}, address = {Potsdam}, isbn = {978-3-86956-539-2}, doi = {10.25932/publishup-58489}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-584897}, pages = {73 -- 82}, year = {2023}, language = {de} } @phdthesis{Ehlert2023, author = {Ehlert, Kristian}, title = {Simulations of active galactic nuclei feedback with cosmic rays and magnetic fields}, doi = {10.25932/publishup-57816}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-578168}, school = {Universit{\"a}t Potsdam}, pages = {155}, year = {2023}, abstract = {The central gas in half of all galaxy clusters shows short cooling times. Assuming unimpeded cooling, this should lead to high star formation and mass cooling rates, which are not observed. Instead, it is believed that condensing gas is accreted by the central black hole that powers an active galactic nuclei jet, which heats the cluster. The detailed heating mechanism remains uncertain. A promising mechanism invokes cosmic ray protons that scatter on self-generated magnetic fluctuations, i.e. Alfv{\´e}n waves. Continuous damping of Alfv{\´e}n waves provides heat to the intracluster medium. Previous work has found steady state solutions for a large sample of clusters where cooling is balanced by Alfv{\´e}nic wave heating. To verify modeling assumptions, we set out to study cosmic ray injection in three-dimensional magnetohydrodynamical simulations of jet feedback in an idealized cluster with the moving-mesh code arepo. We analyze the interaction of jet-inflated bubbles with the turbulent magnetized intracluster medium. Furthermore, jet dynamics and heating are closely linked to the largely unconstrained jet composition. Interactions of electrons with photons of the cosmic microwave background result in observational signatures that depend on the bubble content. Those recent observations provided evidence for underdense bubbles with a relativistic filling while adopting simplifying modeling assumptions for the bubbles. By reproducing the observations with our simulations, we confirm the validity of their modeling assumptions and as such, confirm the important finding of low-(momentum) density jets. In addition, the velocity and magnetic field structure of the intracluster medium have profound consequences for bubble evolution and heating processes. As velocity and magnetic fields are physically coupled, we demonstrate that numerical simulations can help link and thereby constrain their respective observables. Finally, we implement the currently preferred accretion model, cold accretion, into the moving-mesh code arepo and study feedback by light jets in a radiatively cooling magnetized cluster. While self-regulation is attained independently of accretion model, jet density and feedback efficiencies, we find that in order to reproduce observed cold gas morphology light jets are preferred.}, language = {en} } @phdthesis{DeAndradeQueiroz2023, author = {De Andrade Queiroz, Anna Barbara}, title = {The Milky Way disks, bulge, and bar sub-populations}, doi = {10.25932/publishup-59061}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-590615}, school = {Universit{\"a}t Potsdam}, pages = {xii, 187}, year = {2023}, abstract = {In recent decades, astronomy has seen a boom in large-scale stellar surveys of the Galaxy. The detailed information obtained about millions of individual stars in the Milky Way is bringing us a step closer to answering one of the most outstanding questions in astrophysics: how do galaxies form and evolve? The Milky Way is the only galaxy where we can dissect many stars into their high-dimensional chemical composition and complete phase space, which analogously as fossil records can unveil the past history of the genesis of the Galaxy. The processes that lead to large structure formation, such as the Milky Way, are critical for constraining cosmological models; we call this line of study Galactic archaeology or near-field cosmology. At the core of this work, we present a collection of efforts to chemically and dynamically characterise the disks and bulge of our Galaxy. The results we present in this thesis have only been possible thanks to the advent of the Gaia astrometric satellite, which has revolutionised the field of Galactic archaeology by precisely measuring the positions, parallax distances and motions of more than a billion stars. Another, though not less important, breakthrough is the APOGEE survey, which has observed spectra in the near-infrared peering into the dusty regions of the Galaxy, allowing us to determine detailed chemical abundance patterns in hundreds of thousands of stars. To accurately depict the Milky Way structure, we use and develop the Bayesian isochrone fitting tool/code called StarHorse; this software can predict stellar distances, extinctions and ages by combining astrometry, photometry and spectroscopy based on stellar evolutionary models. The StarHorse code is pivotal to calculating distances where Gaia parallaxes alone cannot allow accurate estimates. We show that by combining Gaia, APOGEE, photometric surveys and using StarHorse, we can produce a chemical cartography of the Milky way disks from their outermost to innermost parts. Such a map is unprecedented in the inner Galaxy. It reveals a continuity of the bimodal chemical pattern previously detected in the solar neighbourhood, indicating two populations with distinct formation histories. Furthermore, the data reveals a chemical gradient within the thin disk where the content of 𝛼-process elements and metals is higher towards the centre. Focusing on a sample in the inner MW we confirm the extension of the chemical duality to the innermost regions of the Galaxy. We find stars with bar shape orbits to show both high- and low-𝛼 abundances, suggesting the bar formed by secular evolution trapping stars that already existed. By analysing the chemical orbital space of the inner Galactic regions, we disentangle the multiple populations that inhabit this complex region. We reveal the presence of the thin disk, thick disk, bar, and a counter-rotating population, which resembles the outcome of a perturbed proto-Galactic disk. Our study also finds that the inner Galaxy holds a high quantity of super metal-rich stars up to three times solar suggesting it is a possible repository of old super-metal-rich stars found in the solar neighbourhood. We also enter into the complicated task of deriving individual stellar ages. With StarHorse, we calculate the ages of main-sequence turn-off and sub-giant stars for several public spectroscopic surveys. We validate our results by investigating linear relations between chemical abundances and time since the 𝛼 and neutron capture elements are sensitive to age as a reflection of the different enrichment timescales of these elements. For further study of the disks in the solar neighbourhood, we use an unsupervised machine learning algorithm to delineate a multidimensional separation of chrono-chemical stellar groups revealing the chemical thick disk, the thin disk, and young 𝛼-rich stars. The thick disk is shown to have a small age dispersion indicating its fast formation contrary to the thin disk that spans a wide range of ages. With groundbreaking data, this thesis encloses a detailed chemo-dynamical view of the disk and bulge of our Galaxy. Our findings on the Milky Way can be linked to the evolution of high redshift disk galaxies, helping to solve the conundrum of galaxy formation.}, language = {en} } @phdthesis{Werhahn2023, author = {Werhahn, Maria}, title = {Simulating galaxy evolution with cosmic rays: the multi-frequency view}, doi = {10.25932/publishup-57285}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-572851}, school = {Universit{\"a}t Potsdam}, pages = {5, 220}, year = {2023}, abstract = {Cosmic rays (CRs) constitute an important component of the interstellar medium (ISM) of galaxies and are thought to play an essential role in governing their evolution. In particular, they are able to impact the dynamics of a galaxy by driving galactic outflows or heating the ISM and thereby affecting the efficiency of star-formation. Hence, in order to understand galaxy formation and evolution, we need to accurately model this non-thermal constituent of the ISM. But except in our local environment within the Milky Way, we do not have the ability to measure CRs directly in other galaxies. However, there are many ways to indirectly observe CRs via the radiation they emit due to their interaction with magnetic and interstellar radiation fields as well as with the ISM. In this work, I develop a numerical framework to calculate the spectral distribution of CRs in simulations of isolated galaxies where a steady-state between injection and cooling is assumed. Furthermore, I calculate the non-thermal emission processes arising from the modelled CR proton and electron spectra ranging from radio wavelengths up to the very high-energy gamma-ray regime. I apply this code to a number of high-resolution magneto-hydrodynamical (MHD) simulations of isolated galaxies, where CRs are included. This allows me to study their CR spectra and compare them to observations of the CR proton and electron spectra by the Voyager-1 satellite and the AMS-02 instrument in order to reveal the origin of the measured spectral features. Furthermore, I provide detailed emission maps, luminosities and spectra of the non-thermal emission from our simulated galaxies that range from dwarfs to Milk-Way analogues to starburst galaxies at different evolutionary stages. I successfully reproduce the observed relations between the radio and gamma-ray luminosities with the far-infrared (FIR) emission of star-forming (SF) galaxies, respectively, where the latter is a good tracer of the star-formation rate. I find that highly SF galaxies are close to the limit where their CR population would lose all of their energy due to the emission of radiation, whereas CRs tend to escape low SF galaxies more quickly. On top of that, I investigate the properties of CR transport that are needed in order to match the observed gamma-ray spectra. Furthermore, I uncover the underlying processes that enable the FIR-radio correlation (FRC) to be maintained even in starburst galaxies and find that thermal free-free-emission naturally explains the observed radio spectra in SF galaxies like M82 and NGC 253 thus solving the riddle of flat radio spectra that have been proposed to contradict the observed tight FRC. Lastly, I scrutinise the steady-state modelling of the CR proton component by investigating for the first time the influence of spectrally resolved CR transport in MHD simulations on the hadronic gamma-ray emission of SF galaxies revealing new insights into the observational signatures of CR transport both spectrally and spatially.}, language = {en} } @phdthesis{Kruse2023, author = {Kruse, Marlen}, title = {Characterization of biomolecules and their interactions using electrically controllable DNA nanolevers}, doi = {10.25932/publishup-57738}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-577384}, school = {Universit{\"a}t Potsdam}, pages = {100, xxii}, year = {2023}, abstract = {In this work, binding interactions between biomolecules were analyzed by a technique that is based on electrically controllable DNA nanolevers. The technique was applied to virus-receptor interactions for the first time. As receptors, primarily peptides on DNA nanostructures and antibodies were utilized. The DNA nanostructures were integrated into the measurement technique and enabled the presentation of the peptides in a controllable geometrical order. The number of peptides could be varied to be compatible to the binding sites of the viral surface proteins. Influenza A virus served as a model system, on which the general measurability was demonstrated. Variations of the receptor peptide, the surface ligand density, the measurement temperature and the virus subtypes showed the sensitivity and applicability of the technology. Additionally, the immobilization of virus particles enabled the measurement of differences in oligovalent binding of DNA-peptide nanostructures to the viral proteins in their native environment. When the coronavirus pandemic broke out in 2020, work on binding interactions of a peptide from the hACE2 receptor and the spike protein of the SARS-CoV-2 virus revealed that oligovalent binding can be quantified in the switchSENSE technology. It could also be shown that small changes in the amino acid sequence of the spike protein resulted in complete loss of binding. Interactions of the peptide and inactivated virus material as well as pseudo virus particles could be measured. Additionally, the switchSENSE technology was utilized to rank six antibodies for their binding affinity towards the nucleocapsid protein of SARS-CoV-2 for the development of a rapid antigen test device. The technique was furthermore employed to show binding of a non-enveloped virus (adenovirus) and a virus-like particle (norovirus-like particle) to antibodies. Apart from binding interactions, the use of DNA origami levers with a length of around 50 nm enabled the switching of virus material. This proved that the technology is also able to size objects with a hydrodynamic diameter larger than 14 nm. A theoretical work on diffusion and reaction-limited binding interactions revealed that the technique and the chosen parameters enable the determination of binding rate constants in the reaction-limited regime. Overall, the applicability of the switchSENSE technique to virus-receptor binding interactions could be demonstrated on multiple examples. While there are challenges that remain, the setup enables the determination of affinities between viruses and receptors in their native environment. Especially the possibilities regarding the quantification of oligo- and multivalent binding interactions could be presented.}, language = {en} } @phdthesis{Drobyshev2023, author = {Drobyshev, Evgenii}, title = {Toxic or beneficial? What is the role of food-relevant selenium species selenoneine?}, doi = {10.25932/publishup-57379}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-573794}, school = {Universit{\"a}t Potsdam}, pages = {xiv, 100}, year = {2023}, abstract = {Selenium (Se) is an essential trace element that is ubiquitously present in the environment in small concentrations. Essential functions of Se in the human body are manifested through the wide range of proteins, containing selenocysteine as their active center. Such proteins are called selenoproteins which are found in multiple physiological processes like antioxidative defense and the regulation of thyroid hormone functions. Therefore, Se deficiency is known to cause a broad spectrum of physiological impairments, especially in endemic regions with low Se content. Nevertheless, being an essential trace element, Se could exhibit toxic effects, if its intake exceeds tolerable levels. Accordingly, this range between deficiency and overexposure represents optimal Se supply. However, this range was found to be narrower than for any other essential trace element. Together with significantly varying Se concentrations in soil and the presence of specific bioaccumulation factors, this represents a noticeable difficulty in the assessment of Se epidemiological status. While Se is acting in the body through multiple selenoproteins, its intake occurs mainly in form of small organic or inorganic molecular mass species. Thus, Se exposure not only depends on daily intake but also on the respective chemical form, in which it is present. The essential functions of selenium have been known for a long time and its primary forms in different food sources have been described. Nevertheless, analytical capabilities for a comprehensive investigation of Se species and their derivatives have been introduced only in the last decades. A new Se compound was identified in 2010 in the blood and tissues of bluefin tuna. It was called selenoneine (SeN) since it is an isologue of naturally occurring antioxidant ergothioneine (ET), where Se replaces sulfur. In the following years, SeN was identified in a number of edible fish species and attracted attention as a new dietary Se source and potentially strong antioxidant. Studies in populations whose diet largely relies on fish revealed that SeN represents the main non-protein bound Se pool in their blood. First studies, conducted with enriched fish extracts, already demonstrated the high antioxidative potential of SeN and its possible function in the detoxification of methylmercury in fish. Cell culture studies demonstrated, that SeN can utilize the same transporter as ergothioneine, and SeN metabolite was found in human urine. Until recently, studies on SeN properties were severely limited due to the lack of ways to obtain the pure compound. As a predisposition to this work was firstly a successful approach to SeN synthesis in the University of Graz, utilizing genetically modified yeasts. In the current study, by use of HepG2 liver carcinoma cells, it was demonstrated, that SeN does not cause toxic effectsup to 100 μM concentration in hepatocytes. Uptake experiments showed that SeN is not bioavailable to the used liver cells. In the next part a blood-brain barrier (BBB) model, based on capillary endothelial cells from the porcine brain, was used to describe the possible transfer of SeN into the central nervous system (CNS). The assessment of toxicity markers in these endothelial cells and monitoring of barrier conditions during transfer experiments demonstrated the absence of toxic effects from SeN on the BBB endothelium up to 100 μM concentration. Transfer data for SeN showed slow but substantial transfer. A statistically significant increase was observed after 48 hours following SeN incubation from the blood-facing side of the barrier. However, an increase in Se content was clearly visible already after 6 hours of incubation with 1 μM of SeN. While the transfer rate of SeN after application of 0.1 μM dose was very close to that for 1 μM, incubation with 10 μM of SeN resulted in a significantly decreased transfer rate. Double-sided application of SeN caused no side-specific transfer of SeN, thus suggesting a passive diffusion mechanism of SeN across the BBB. This data is in accordance with animal studies, where ET accumulation was observed in the rat brain, even though rat BBB does not have the primary ET transporter - OCTN1. Investigation of capillary endothelial cell monolayers after incubation with SeN and reference selenium compounds showed no significant increase of intracellular selenium concentration. Speciesspecific Se measurements in medium samples from apical and basolateral compartments, as good as in cell lysates, showed no SeN metabolization. Therefore, it can be concluded that SeN may reach the brain without significant transformation. As the third part of this work, the assessment of SeN antioxidant properties was performed in Caco-2 human colorectal adenocarcinoma cells. Previous studies demonstrated that the intestinal epithelium is able to actively transport SeN from the intestinal lumen to the blood side and accumulate SeN. Further investigation within current work showed a much higher antioxidant potential of SeN compared to ET. The radical scavenging activity after incubation with SeN was close to the one observed for selenite and selenomethionine. However, the SeN effect on the viability of intestinal cells under oxidative conditions was close to the one caused by ET. To answer the question if SeN is able to be used as a dietary Se source and induce the activity of selenoproteins, the activity of glutathione peroxidase (GPx) and the secretion of selenoprotein P (SelenoP) were measured in Caco-2 cells, additionally. As expected, reference selenium compounds selenite and selenomethionine caused efficient induction of GPx activity. In contrast to those SeN had no effect on GPx activity. To examine the possibility of SeN being embedded into the selenoproteome, SelenoP was measured in a culture medium. Even though Caco-2 cells effectively take up SeN in quantities much higher than selenite or selenomethionine, no secretion of SelenoP was observed after SeN incubation. Summarizing, we can conclude that SeN can hardly serve as a Se source for selenoprotein synthesis. However, SeN exhibit strong antioxidative properties, which appear when sulfur in ET is exchanged by Se. Therefore, SeN is of particular interest for research not as part of Se metabolism, but important endemic dietary antioxidant.}, language = {en} } @article{Felsing2023, author = {Felsing, Ulrike}, title = {Elternpartizipation: Hand in Hand - wie die Kommunikation zwischen Therapeut:innen und Eltern gelingt}, series = {Spektrum Patholinguistik 16}, journal = {Spektrum Patholinguistik 16}, number = {16}, publisher = {Universit{\"a}tsverlag Potsdam}, address = {Potsdam}, isbn = {978-3-86956-559-0}, issn = {1866-9433}, doi = {10.25932/publishup-61339}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-613395}, pages = {1 -- 14}, year = {2023}, abstract = {F{\"u}r eine gelingende Kommunikation und Zusammenarbeit zwischen Therapeut:innen und Eltern sind meines Erachtens zwei Aspekte wesentlich: die therapeutische Haltung/innere Einstellung zur Beziehungsgestaltung auf Seiten der Therapeut:innen sowie ihr Wissen und die F{\"a}higkeiten, Eltern ganz pragmatisch in den therapeutischen Prozess einzubinden.}, language = {de} } @misc{Paetzel2023, type = {Master Thesis}, author = {P{\"a}tzel, Jonas}, title = {Seismic site characterization using broadband and DAS ambient vibration measurements on Mt Etna, Italy}, doi = {10.25932/publishup-61379}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-613793}, school = {Universit{\"a}t Potsdam}, pages = {95}, year = {2023}, abstract = {Both horizontal-to-vertical (H/V) spectral ratios and the spatial autocorrelation method (SPAC) have proven to be valuable tools to gain insight into local site effects by ambient noise measurements. Here, the two methods are employed to assess the subsurface velocity structure at the Piano delle Concazze area on Mt Etna. Volcanic tremor records from an array of 26 broadband seismometers is processed and a strong variability of H/V ratios during periods of increased volcanic activity is found. From the spatial distribution of H/V peak frequencies, a geologic structure in the north-east of Piano delle Concazze is imaged which is interpreted as the Ellittico caldera rim. The method is extended to include both velocity data from the broadband stations and distributed acoustic sensing data from a co-located 1.5 km long fibre optic cable. High maximum amplitude values of the resulting ratios along the trajectory of the cable coincide with known faults. The outcome also indicates previously unmapped parts of a fault. The geologic interpretation is in good agreement with inversion results from magnetic survey data. Using the neighborhood algorithm, spatial autocorrelation curves obtained from the modified SPAC are inverted alone and jointly with the H/V peak frequencies for 1D shear wave velocity profiles. The obtained models are largely consistent with published models and were able to validate the results from the fibre optic cable.}, language = {en} } @phdthesis{HerreroAlonso2023, author = {Herrero Alonso, Yohana}, title = {Properties of high-redshift galaxies in different environments}, doi = {10.25932/publishup-61328}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-613288}, school = {Universit{\"a}t Potsdam}, pages = {xiii, 114}, year = {2023}, abstract = {The Lyman-𝛼 (Ly𝛼) line commonly assists in the detection of high-redshift galaxies, the so-called Lyman-alpha emitters (LAEs). LAEs are useful tools to study the baryonic matter distribution of the high-redshift universe. Exploring their spatial distribution not only reveals the large-scale structure of the universe at early epochs, but it also provides an insight into the early formation and evolution of the galaxies we observe today. Because dark matter halos (DMHs) serve as sites of galaxy formation, the LAE distribution also traces that of the underlying dark matter. However, the details of this relation and their co-evolution over time remain unclear. Moreover, theoretical studies predict that the spatial distribution of LAEs also impacts their own circumgalactic medium (CGM) by influencing their extended Ly𝛼 gaseous halos (LAHs), whose origin is still under investigation. In this thesis, I make several contributions to improve the knowledge on these fields using samples of LAEs observed with the Multi Unit Spectroscopic Explorer (MUSE) at redshifts of 3 < 𝑧 < 6.}, language = {en} } @phdthesis{Stanke2023, author = {Stanke, Sandra}, title = {AC electrokinetic immobilization of influenza viruses and antibodies on nanoelectrode arrays for on-chip immunoassays}, doi = {10.25932/publishup-61716}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-617165}, school = {Universit{\"a}t Potsdam}, pages = {x, 115}, year = {2023}, abstract = {In the present thesis, AC electrokinetic forces, like dielectrophoresis and AC electroosmosis, were demonstrated as a simple and fast method to functionalize the surface of nanoelectrodes with submicrometer sized biological objects. These nanoelectrodes have a cylindrical shape with a diameter of 500 nm arranged in an array of 6256 electrodes. Due to its medical relevance influenza virus as well as anti-influenza antibodies were chosen as a model organism. Common methods to bring antibodies or proteins to biosensor surfaces are complex and time-consuming. In the present work, it was demonstrated that by applying AC electric fields influenza viruses and antibodies can be immobilized onto the nanoelectrodes within seconds without any prior chemical modification of neither the surface nor the immobilized biological object. The distribution of these immobilized objects is not uniform over the entire array, it exhibits a decreasing gradient from the outer row to the inner ones. Different causes for this gradient have been discussed, such as the vortex-shaped fluid motion above the nanoelectrodes generated by, among others, electrothermal fluid flow. It was demonstrated that parts of the accumulated material are permanently immobilized to the electrodes. This is a unique characteristic of the presented system since in the literature the AC electrokinetic immobilization is almost entirely presented as a method just for temporary immobilization. The spatial distribution of the immobilized viral material or the anti-influenza antibodies at the electrodes was observed by either the combination of fluorescence microscopy and deconvolution or by super-resolution microscopy (STED). On-chip immunoassays were performed to examine the suitability of the functionalized electrodes as a potential affinity-based biosensor. Two approaches were pursued: A) the influenza virus as the bio-receptor or B) the influenza virus as the analyte. Different sources of error were eliminated by ELISA and passivation experiments. Hence, the activity of the immobilized object was inspected by incubation with the analyte. This resulted in the successful detection of anti-influenza antibodies by the immobilized viral material. On the other hand, a detection of influenza virus particles by the immobilized anti-influenza antibodies was not possible. The latter might be due to lost activity or wrong orientation of the antibodies. Thus, further examinations on the activity of by AC electric fields immobilized antibodies should follow. When combined with microfluidics and an electrical read-out system, the functionalized chips possess the potential to serve as a rapid, portable, and cost-effective point-of-care (POC) device. This device can be utilized as a basis for diverse applications in diagnosing and treating influenza, as well as various other pathogens.}, language = {en} } @article{SingerBrehm2023, author = {Singer-Brehm, Elisabeth}, title = {‚Maise Jeschurun'}, series = {Genisa-Bl{\"a}tter IV}, journal = {Genisa-Bl{\"a}tter IV}, publisher = {Universit{\"a}tsverlag Potsdam}, address = {Potsdam}, isbn = {978-3-86956-539-2}, doi = {10.25932/publishup-58493}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-584932}, pages = {129 -- 157}, year = {2023}, language = {de} } @article{Ulična2023, author = {Uličn{\´a}, Lenka}, title = {Zur Unheil abwendenden Funktion der Genisa}, series = {Genisa-Bl{\"a}tter IV}, journal = {Genisa-Bl{\"a}tter IV}, publisher = {Universit{\"a}tsverlag Potsdam}, address = {Potsdam}, isbn = {978-3-86956-539-2}, doi = {10.25932/publishup-58486}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-584868}, pages = {27 -- 39}, year = {2023}, language = {de} } @article{CohenHattab2023, author = {Cohen-Hattab, Kobi}, title = {Pioneers of Independent Jewish Shipping}, series = {PaRDeS : Journal of the Association for Jewish Studies in Germany}, journal = {PaRDeS : Journal of the Association for Jewish Studies in Germany}, number = {28}, publisher = {Universit{\"a}tsverlag Potsdam}, address = {Potsdam}, isbn = {978-3-86956-552-1}, issn = {1614-6492}, doi = {10.25932/publishup-58554}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-585542}, pages = {34 -- 50}, year = {2023}, abstract = {The birth of the Yishuv's national shipping company, ZIM was preceded by private enterprise; the sea had not traditionally been a focus of the Zionist movement. In the 1930s, a five-year span of private commercial shipping saw three companies in the Jewish community in Palestine - Palestine Shipping Company, Palestine Maritime Lloyd, and Atid - before shipping was cut short by the outbreak of the Second World War. Despite their brief lifespans and their negligible contribution to general shipping, these companies constituted an important milestone. Their existence helped shift the Yishuv leadership's attitudes about shipping's importance for the community and the need for it to be supported by national institutions.}, language = {en} } @article{Weinmann2023, author = {Weinmann, Franziska}, title = {Mothers of Seafaring}, series = {PaRDeS : Journal of the Association for Jewish Studies in Germany}, journal = {PaRDeS : Journal of the Association for Jewish Studies in Germany}, number = {28}, publisher = {Universit{\"a}tsverlag Potsdam}, address = {Potsdam}, isbn = {978-3-86956-552-1}, issn = {1614-6492}, doi = {10.25932/publishup-58556}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-585563}, pages = {52 -- 67}, year = {2023}, abstract = {The article aims to trace the contribution of Jewish women in the Yishuv's maritime history. Taking the example of Henrietta Diamond, a founding member and chairperson of the Zebulun Seafaring Society, the article seeks to explore the representation and role of women in a growing Jewish maritime domain from the 1930s to the 1950s. It examines Zionist narratives on the 'New Jew' and the Jewish body and studies their relevance for the emerging field of maritime activities in the Yishuv. By contextualizing the work and depiction of Henrietta Diamond, the article sheds new light on the gendered notions that underlay the emergence of the Jewish maritime domain and illustrates the patterns of inclusion and exclusion in it.}, language = {en} } @masterthesis{Eggers2023, type = {Bachelor Thesis}, author = {Eggers, Nele}, title = {Properties of Arctic aerosol in the transition between Arctic haze to summer season derived by lidar}, doi = {10.25932/publishup-61943}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-619438}, school = {Universit{\"a}t Potsdam}, pages = {x, 63}, year = {2023}, abstract = {During the Arctic haze period, the Arctic troposphere consists of larger, yet fewer, aerosol particles than during the summer (Tunved et al., 2013; Quinn et al., 2007). Interannual variability (Graßl and Ritter, 2019; Rinke et al., 2004), as well as unknown origins (Stock et al., 2014) and properties of aerosol complicate modeling these annual aerosol cycles. This thesis investigates the modification of the microphysical properties of Arctic aerosols in the transition from Arctic haze to the summer season. Therefore, lidar measurements of Ny-{\AA}lesund from April 2021 to the end of July 2021 are evaluated based on the aerosols' optical properties. An overview of those properties will be provided. Furthermore, parallel radiosonde data is considered for indication of hygroscopic growth. The annual aerosol cycle in 2021 differs from expectations based on previous studies from Tunved et al. (2013) and Quinn et al. (2007). Developments of backscatter, extinction, aerosol depolarisation, lidar ratio and color ratio show a return of the Arctic haze in May. The haze had already reduced in April, but regrew afterwards. The average Arctic aerosol displays hygroscopic behaviour, meaning growth due to water uptake. To determine such a behaviour is generally laborious because various meteorological circumstances need to be considered. Two case studies provide further information on these possible events. In particular, a day with a rare ice cloud and with highly variable water cloud layers is observed.}, language = {en} } @phdthesis{Pons2023, author = {Pons, Micha{\"e}l}, title = {The Nature of the tectonic shortening in Central Andes}, doi = {10.25932/publishup-60089}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-600892}, school = {Universit{\"a}t Potsdam}, pages = {160}, year = {2023}, abstract = {The Andean Cordillera is a mountain range located at the western South American margin and is part of the Eastern- Circum-Pacific orogenic Belt. The ~7000 km long mountain range is one of the longest on Earth and hosts the second largest orogenic plateau in the world, the Altiplano-Puna plateau. The Andes are known as a non-collisional subduction-type orogen which developed as a result of the interaction between the subducted oceanic Nazca plate and the South American continental plate. The different Andean segments exhibit along-strike variations of morphotectonic provinces characterized by different elevations, volcanic activity, deformation styles, crustal thickness, shortening magnitude and oceanic plate geometry. Most of the present-day elevation can be explained by crustal shortening in the last ~50 Ma, with the shortening magnitude decreasing from ~300 km in the central (15°S-30°S) segment to less than half that in the southern part (30°S-40°S). Several factors were proposed that might control the magnitude and acceleration of shortening of the Central Andes in the last 15 Ma. One important factor is likely the slab geometry. At 27-33°S, the slab dips horizontally at ~100 km depth due to the subduction of the buoyant Juan Fernandez Ridge, forming the Pampean flat-slab. This horizontal subduction is thought to influence the thermo-mechanical state of the Sierras Pampeanas foreland, for instance, by strengthening the lithosphere and promoting the thick-skinned propagation of deformation to the east, resulting in the uplift of the Sierras Pampeanas basement blocks. The flat-slab has migrated southwards from the Altiplano latitude at ~30 Ma to its present-day position and the processes and consequences associated to its passage on the contemporaneous acceleration of the shortening rate in Central Andes remain unclear. Although the passage of the flat-slab could offer an explanation to the acceleration of the shortening, the timing does not explain the two pulses of shortening at about 15 Ma and 4 Ma that are suggested from geological observations. I hypothesize that deformation in the Central Andes is controlled by a complex interaction between the subduction dynamics of the Nazca plate and the dynamic strengthening and weakening of the South American plate due to several upper plate processes. To test this hypothesis, a detailed investigation into the role of the flat-slab, the structural inheritance of the continental plate, and the subduction dynamics in the Andes is needed. Therefore, I have built two classes of numerical thermo-mechanical models: (i) The first class of models are a series of generic E-W-oriented high-resolution 2D subduction models thatinclude flat subduction in order to investigate the role of the subduction dynamics on the temporal variability of the shortening rate in the Central Andes at Altiplano latitudes (~21°S). The shortening rate from the models was then validated with the observed tectonic shortening rate in the Central Andes. (ii) The second class of models are a series of 3D data-driven models of the present-day Pampean flat-slab configuration and the Sierras Pampeanas (26-42°S). The models aim to investigate the relative contribution of the present-day flat subduction and inherited structures in the continental lithosphere on the strain localization. Both model classes were built using the advanced finite element geodynamic code ASPECT. The first main finding of this work is to suggest that the temporal variability of shortening in the Central Andes is primarily controlled by the subduction dynamics of the Nazca plate while it penetrates into the mantle transition zone. These dynamics depends on the westward velocity of the South American plate that provides the main crustal shortening force to the Andes and forces the trench to retreat. When the subducting plate reaches the lower mantle, it buckles on it-self until the forced trench retreat causes the slab to steepen in the upper mantle in contrast with the classical slab-anchoring model. The steepening of the slab hinders the trench causing it to resist the advancing South American plate, resulting in the pulsatile shortening. This buckling and steepening subduction regime could have been initiated because of the overall decrease in the westwards velocity of the South American plate. In addition, the passage of the flat-slab is required to promote the shortening of the continental plate because flat subduction scrapes the mantle lithosphere, thus weakening the continental plate. This process contributes to the efficient shortening when the trench is hindered, followed by mantle lithosphere delamination at ~20 Ma. Finally, the underthrusting of the Brazilian cratonic shield beneath the orogen occurs at ~11 Ma due to the mechanical weakening of the thick sediments covered the shield margin, and due to the decreasing resistance of the weakened lithosphere of the orogen. The second main finding of this work is to suggest that the cold flat-slab strengthens the overriding continental lithosphere and prevents strain localization. Therefore, the deformation is transmitted to the eastern front of the flat-slab segment by the shear stress operating at the subduction interface, thus the flat-slab acts like an indenter that "bulldozes" the mantle-keel of the continental lithosphere. The offset in the propagation of deformation to the east between the flat and steeper slab segments in the south causes the formation of a transpressive dextral shear zone. Here, inherited faults of past tectonic events are reactivated and further localize the deformation in an en-echelon strike-slip shear zone, through a mechanism that I refer to as "flat-slab conveyor". Specifically, the shallowing of the flat-slab causes the lateral deformation, which explains the timing of multiple geological events preceding the arrival of the flat-slab at 33°S. These include the onset of the compression and of the transition between thin to thick-skinned deformation styles resulting from the crustal contraction of the crust in the Sierras Pampeanas some 10 and 6 Myr before the Juan Fernandez Ridge collision at that latitude, respectively.}, language = {en} } @phdthesis{Gruner2023, author = {Gruner, David}, title = {New frontiers in gyrochronology}, doi = {10.25932/publishup-61526}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-615268}, school = {Universit{\"a}t Potsdam}, pages = {x, 131}, year = {2023}, abstract = {Late-type stars are by far the most frequent stars in the universe and of fundamental interest to various fields of astronomy - most notably to Galactic archaeology and exoplanet research. However, such stars barely change during their main sequence lifetime; their temperature, luminosity, or chemical composition evolve only very slowly over the course of billions of years. As such, it is difficult to obtain the age of such a star, especially when it is isolated and no other indications (like cluster association) can be used. Gyrochronology offers a way to overcome this problem. Stars, just like all other objects in the universe, rotate and the rate at which stars rotate impacts many aspects of their appearance and evolution. Gyrochronology leverages the observed rotation rate of a late-type main sequence star and its systematic evolution to estimate their ages. Unlike the above-mentioned parameters, the rotation rate of a main sequence star changes drastically throughout its main sequence lifetime; stars spin down. The youngest stars rotate every few hours, whereas much older stars rotate only about once a month, or - in the case of some late M-stars - once in a hundred days. Given that this spindown is systematic (with an additional mass dependence), it gave rise to the idea of using the observed rotation rate of a star (and its mass or a suitable proxy thereof) to estimate a star's age. This has been explored widely in young stellar open clusters but remains essentially unconstrained for stars older than the sun, and K and M stars older than 1 Gyr. This thesis focuses on the continued exploration of the spindown behavior to assess, whether gyrochronology remains applicable for stars of old ages, whether it is universal for late-type main sequence stars (including field stars), and to provide calibration mileposts for spindown models. To accomplish this, I have analyzed data from Kepler space telescope for the open clusters Ruprecht 147 (2.7 Gyr old) and M 67 (4 Gyr). Time series photometry data (light curves) were obtained for both clusters during Kepler's K2 mission. However, due to technical limitations and telescope malfunctions, extracting usable data from the K2 mission to identify (especially long) rotation periods requires extensive data preparation. For Ruprecht 147, I have compiled a list of about 300 cluster members from the literature and adopted preprocessed light curves from the Kepler archive where available. They have been cleaned of the gravest of data artifacts but still contained systematics. After correcting them for said artifacts, I was able to identify rotation periods in 31 of them. For M 67 more effort was taken. My work on Ruprecht 147 has shown the limitations imposed by the preselection of Kepler targets. Therefore, I adopted the time series full frame image directly and performed photometry on a much higher spatial resolution to be able to obtain data for as many stars as possible. This also means that I had to deal with the ubiquitous artifacts in Kepler data. For that, I devised a method that correlates the artificial flux variations with the ongoing drift of the telescope pointing in order to remove it. This process was a large success and I was able to create light curves whose quality match and even exceede those that were created by the Kepler mission - all while operating on higher spatial resolution and processing fainter stars. Ultimately, I was able to identify signs of periodic variability in the (created) light curves for 31 and 47 stars in Ruprecht 147 and M 67, respectively. My data connect well to bluer stars of cluster of the same age and extend for the first time to stars redder than early-K and older than 1 Gyr. The cluster data show a clear flattening in the distribution of Ruprecht 147 and even a downturn for M 67, resulting in a somewhat sinusoidal shape. With that, I have shown that the systematic spindown of stars continues at least until 4 Gyr and stars continue to live on a single surface in age-rotation periods-mass space which allows gyrochronology to be used at least up to that age. However, the shape of the spindown - as exemplified by the newly discovered sinusoidal shape of the cluster sequence - deviates strongly from the expectations. I then compiled an extensive sample of rotation data in open clusters - very much including my own work - and used the resulting cluster skeleton (with each cluster forming a rip in color-rotation period-mass space) to investigate if field stars follow the same spindown as cluster stars. For the field stars, I used wide binaries, which - with their shared origin and coevality - are in a sense the smallest possible open clusters. I devised an empirical method to evaluate the consistency between the rotation rates of the wide binary components and found that the vast majority of them are in fact consistent with what is observed in open clusters. This leads me to conclude that gyrochronology - calibrated on open clusters - can be applied to determine the ages of field stars.}, language = {en} } @misc{TanDueringWildeetal.2023, author = {Tan, Sarah and D{\"u}ring, Sarah and Wilde, Alina and Hamburger, Lara and Fritzsche, Tom and Felsing, Ulrike and Lauer, Norina and Corsten, Sabine and Ostermann, Frank and Nonn, Kerstin and Nerz, Verena and Neumann, Sandra and Zauke, Svenja and Sandrieser, Patricia and Steinberg, Romy Simone and Thurmann, Anika and D{\"o}rr, Fiona and Bilda, Kerstin and Kluth, Alicia and Lemire-Tremblay, Marilyne and Jamey, Kevin and Dalla Bella, Simone and Falk, Simone and Kleing{\"u}nther, Constanze and Gabler, Katrin and Elligsen, Chiara and Weiland, Katharina and Wiehe, Lea and Wahl, Michael and Binczyk, Sarah and Staebel, Cornelia and Jung, Stefanie and Eikerling, Maren and Czok, Clara and Sallat, Stephan and Collasius, Valerie and Grahovac, Tena}, title = {Spektrum Patholinguistik Band 16. Schwerpunktthema: Schnittstelle Alltag: Transfer und Teilhabe in der Sprachtherapie}, number = {16}, editor = {Tan, Sarah and D{\"u}ring, Sarah and Wilde, Alina and Hamburger, Lara and Fritzsche, Tom}, publisher = {Universit{\"a}tsverlag Potsdam}, address = {Potsdam}, isbn = {978-3-86956-559-0}, issn = {1866-9433}, doi = {10.25932/publishup-59043}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-590433}, pages = {viii, 234}, year = {2023}, abstract = {Das 16. Herbsttreffen Patholinguistik mit dem Schwerpunktthema »Schnittstelle Alltag: Transfer und Teilhabe in der Sprachtherapie« fand am 19.11.2022 als Online-Veranstaltung statt. Das Herbsttreffen wird seit 2007 j{\"a}hrlich vom Verband f{\"u}r Patholinguistik e.V. (vpl), seit 2021 vom Deutschen Bundesverband f{\"u}r akademische Sprachtherapie und Logop{\"a}die (dbs) in Kooperation mit der Universit{\"a}t Potsdam durchgef{\"u}hrt. Der vorliegende Tagungsband beinhaltet die Vortr{\"a}ge zum Schwerpunktthema sowie die Posterpr{\"a}sentationen zu weiteren Themen aus der sprachtherapeutischen Forschung und Praxis.}, language = {de} } @phdthesis{Metz2023, author = {Metz, Malte}, title = {Finite fault earthquake source inversions}, doi = {10.25932/publishup-61974}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-619745}, school = {Universit{\"a}t Potsdam}, pages = {143}, year = {2023}, abstract = {Earthquake modeling is the key to a profound understanding of a rupture. Its kinematics or dynamics are derived from advanced rupture models that allow, for example, to reconstruct the direction and velocity of the rupture front or the evolving slip distribution behind the rupture front. Such models are often parameterized by a lattice of interacting sub-faults with many degrees of freedom, where, for example, the time history of the slip and rake on each sub-fault are inverted. To avoid overfitting or other numerical instabilities during a finite-fault estimation, most models are stabilized by geometric rather than physical constraints such as smoothing. As a basis for the inversion approach of this study, we build on a new pseudo-dynamic rupture model (PDR) with only a few free parameters and a simple geometry as a physics-based solution of an earthquake rupture. The PDR derives the instantaneous slip from a given stress drop on the fault plane, with boundary conditions on the developing crack surface guaranteed at all times via a boundary element approach. As a side product, the source time function on each point on the rupture plane is not constraint and develops by itself without additional parametrization. The code was made publicly available as part of the Pyrocko and Grond Python packages. The approach was compared with conventional modeling for different earthquakes. For example, for the Mw 7.1 2016 Kumamoto, Japan, earthquake, the effects of geometric changes in the rupture surface on the slip and slip rate distributions could be reproduced by simply projecting stress vectors. For the Mw 7.5 2018 Palu, Indonesia, strike-slip earthquake, we also modelled rupture propagation using the 2D Eikonal equation and assuming a linear relationship between rupture and shear wave velocity. This allowed us to give a deeper and faster propagating rupture front and the resulting upward refraction as a new possible explanation for the apparent supershear observed at the Earth's surface. The thesis investigates three aspects of earthquake inversion using PDR: (1) to test whether implementing a simplified rupture model with few parameters into a probabilistic Bayesian scheme without constraining geometric parameters is feasible, and whether this leads to fast and robust results that can be used for subsequent fast information systems (e.g., ground motion predictions). (2) To investigate whether combining broadband and strong-motion seismic records together with near-field ground deformation data improves the reliability of estimated rupture models in a Bayesian inversion. (3) To investigate whether a complex rupture can be represented by the inversion of multiple PDR sources and for what type of earthquakes this is recommended. I developed the PDR inversion approach and applied the joint data inversions to two seismic sequences in different tectonic settings. Using multiple frequency bands and a multiple source inversion approach, I captured the multi-modal behaviour of the Mw 8.2 2021 South Sandwich subduction earthquake with a large, curved and slow rupturing shallow earthquake bounded by two faster and deeper smaller events. I could cross-validate the results with other methods, i.e., P-wave energy back-projection, a clustering analysis of aftershocks and a simple tsunami forward model. The joint analysis of ground deformation and seismic data within a multiple source inversion also shed light on an earthquake triplet, which occurred in July 2022 in SE Iran. From the inversion and aftershock relocalization, I found indications for a vertical separation between the shallower mainshocks within the sedimentary cover and deeper aftershocks at the sediment-basement interface. The vertical offset could be caused by the ductile response of the evident salt layer to stress perturbations from the mainshocks. The applications highlight the versatility of the simple PDR in probabilistic seismic source inversion capturing features of rather different, complex earthquakes. Limitations, as the evident focus on the major slip patches of the rupture are discussed as well as differences to other finite fault modeling methods.}, language = {en} } @phdthesis{Djalali2023, author = {Djalali, Saveh Arman}, title = {Multiresponsive complex emulsions: Concepts for the design of active and adaptive liquid colloidal systems}, doi = {10.25932/publishup-57520}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-575203}, school = {Universit{\"a}t Potsdam}, pages = {151}, year = {2023}, abstract = {Complex emulsions are dispersions of kinetically stabilized multiphasic emulsion droplets comprised of two or more immiscible liquids that provide a novel material platform for the generation of active and dynamic soft materials. In recent years, the intrinsic reconfigurable morphological behavior of complex emulsions, which can be attributed to the unique force equilibrium between the interfacial tensions acting at the various interfaces, has become of fundamental and applied interest. As such, particularly biphasic Janus droplets have been investigated as structural templates for the generation of anisotropic precision objects, dynamic optical elements or as transducers and signal amplifiers in chemo- and bio-sensing applications. In the present thesis, switchable internal morphological responses of complex droplets triggered by stimuli-induced alterations of the balance of interfacial tensions have been explored as a universal building block for the design of multiresponsive, active, and adaptive liquid colloidal systems. A series of underlying principles and mechanisms that influence the equilibrium of interfacial tensions have been uncovered, which allowed the targeted design of emulsion bodies that can alter their shape, bind and roll on surfaces, or change their geometrical shape in response to chemical stimuli. Consequently, combinations of the unique triggerable behavior of Janus droplets with designer surfactants, such as a stimuli-responsive photosurfactant (AzoTAB) resulted for instance in shape-changing soft colloids that exhibited a jellyfish inspired buoyant motion behavior, holding great promise for the design of biological inspired active material architectures and transformable soft robotics. In situ observations of spherical Janus emulsion droplets using a customized side-view microscopic imaging setup with accompanying pendant dropt measurements disclosed the sensitivity regime of the unique chemical-morphological coupling inside complex emulsions and enabled the recording of calibration curves for the extraction of critical parameters of surfactant effectiveness. The deduced new "responsive drop" method permitted a convenient and cost-efficient quantification and comparison of the critical micelle concentrations (CMCs) and effectiveness of various cationic, anionic, and nonionic surfactants. Moreover, the method allowed insightful characterization of stimuli-responsive surfactants and monitoring of the impact of inorganic salts on the CMC and surfactant effectiveness of ionic and nonionic surfactants. Droplet functionalization with synthetic crown ether surfactants yielded a synthetically minimal material platform capable of autonomous and reversible adaptation to its chemical environment through different supramolecular host-guest recognition events. Addition of metal or ammonium salts resulted in the uptake of the resulting hydrophobic complexes to the hydrocarbon hemisphere, whereas addition of hydrophilic ammonium compounds such as amino acids or polypeptides resulted in supramolecular assemblies at the hydrocarbon-water interface of the droplets. The multiresponsive material platform enabled interfacial complexation and thus triggered responses of the droplets to a variety of chemical triggers including metal ions, ammonium compounds, amino acids, antibodies, carbohydrates as well as amino-functionalized solid surfaces. In the final chapter, the first documented optical logic gates and combinatorial logic circuits based on complex emulsions are presented. More specifically, the unique reconfigurable and multiresponsive properties of complex emulsions were exploited to realize droplet-based logic gates of varying complexity using different stimuli-responsive surfactants in combination with diverse readout methods. In summary, different designs for multiresponsive, active, and adaptive liquid colloidal systems were presented and investigated, enabling the design of novel transformative chemo-intelligent soft material platforms.}, language = {en} } @phdthesis{Kim2023, author = {Kim, Jiyong}, title = {Synthesis of InP quantum dots and their applications}, doi = {10.25932/publishup-58535}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-585351}, school = {Universit{\"a}t Potsdam}, pages = {XIX, 142}, year = {2023}, abstract = {Technologically important, environmentally friendly InP quantum dots (QDs) typically used as green and red emitters in display devices can achieve exceptional photoluminescence quantum yields (PL QYs) of near-unity (95-100\%) when the-state-of-the-art core/shell heterostructure of the ZnSe inner/ZnS outer shell is elaborately applied. Nevertheless, it has only led to a few industrial applications as QD liquid crystal display (QD-LCD) which is applied to blue backlight units, even though QDs has a lot of possibilities that able to realize industrially feasible applications, such as QD light-emitting diodes (QD‒LEDs) and luminescence solar concentrator (LSC), due to their functionalizable characteristics. Before introducing the main research, the theoretical basis and fundamentals of QDs are described in detail on the basis of the quantum mechanics and experimental synthetic results, where a concept of QD and colloidal QD, a type-I core/shell structure, a transition metal doped semiconductor QDs, the surface chemistry of QD, and their applications (LSC, QD‒LEDs, and EHD jet printing) are sequentially elucidated for better understanding. This doctoral thesis mainly focused on the connectivity between QD materials and QD devices, based on the synthesis of InP QDs that are composed of inorganic core (core/shell heterostructure) and organic shell (surface ligands on the QD surface). In particular, as for the former one (core/shell heterostructure), the ZnCuInS mid-shell as an intermediate layer is newly introduced between a Cu-doped InP core and a ZnS shell for LSC devices. As for the latter one (surface ligands), the ligand effect by 1-octanethiol and chloride ion are investigated for the device stability in QD‒LEDs and the printability of electro-hydrodynamic (EHD) jet printing system, in which this research explores the behavior of surface ligands, based on proton transfer mechanism on the QD surface. Chapter 3 demonstrates the synthesis of strain-engineered highly emissive Cu:InP/Zn-Cu-In-S (ZCIS)/ZnS core/shell/shell heterostructure QDs via a one-pot approach. When this unconventional combination of a ZCIS/ZnS double shelling scheme is introduced to a series of Cu:InP cores with different sizes, the resulting Cu:InP/ZCIS/ZnS QDs with a tunable near-IR PL range of 694-850 nm yield the highest-ever PL QYs of 71.5-82.4\%. These outcomes strongly point to the efficacy of the ZCIS interlayer, which makes the core/shell interfacial strain effectively alleviated, toward high emissivity. The presence of such an intermediate ZCIS layer is further examined by comparative size, structural, and compositional analyses. The end of this chapter briefly introduces the research related to the LSC devices, fabricated from Cu:InP/ZCIS/ZnS QDs, currently in progress. Chapter 4 mainly deals with ligand effect in 1-octanethiol passivation of InP/ZnSe/ZnS QDs in terms of incomplete surface passivation during synthesis. This chapter demonstrates the lack of anionic carboxylate ligands on the surface of InP/ZnSe/ZnS quantum dots (QDs), where zinc carboxylate ligands can be converted to carboxylic acid or carboxylate ligands via proton transfer by 1-octanethiol. The as-synthesized QDs initially have an under-coordinated vacancy surface, which is passivated by solvent ligands such as ethanol and acetone. Upon exposure of 1-octanethiol to the QD surface, 1-octanthiol effectively induces the surface binding of anionic carboxylate ligands (derived from zinc carboxylate ligands) by proton transfer, which consequently exchanges ethanol and acetone ligands that bound on the incomplete QD surface. The systematic chemical analyses, such as thermogravimetric analysis‒mass spectrometry and proton nuclear magnetic resonance spectroscopy, directly show the interplay of surface ligands, and it associates with QD light-emitting diodes (QD‒LEDs). Chapter 5 shows the relation between material stability of QDs and device stability of QD‒LEDs through the investigation of surface chemistry and shell thickness. In typical III-V colloidal InP quantum dots (QDs), an inorganic ZnS outermost shell is used to provide stability when overcoated onto the InP core. However, this work presents a faster photo-degradation of InP/ZnSe/ZnS QDs with a thicker ZnS shell than that with a thin ZnS shell when 1-octanethiol was applied as a sulfur source to form ZnS outmost shell. Herein, 1-octanethiol induces the form of weakly-bound carboxylate ligand via proton transfer on the QD surface, resulting in a faster degradation at UV light even though a thicker ZnS shell was formed onto InP/ZnSe QDs. Detailed insight into surface chemistry was obtained from proton nuclear magnetic resonance spectroscopy and thermogravimetric analysis-mass spectrometry. However, the lifetimes of the electroluminescence devices fabricated from InP/ZnSe/ZnS QDs with a thick or a thin ZnS shell show surprisingly the opposite result to the material stability of QDs, where the QD light-emitting diodes (QD‒LEDs) with a thick ZnS shelled QDs maintained its luminance more stable than that with a thin ZnS shelled QDs. This study elucidates the degradation mechanism of the QDs and the QD light-emitting diodes based on the results and discuss why the material stability of QDs is different from the lifetime of QD‒LEDs. Chapter 6 suggests a method how to improve a printability of EHD jet printing when QD materials are applied to QD ink formulation, where this work introduces the application of GaP mid-shelled InP QDs as a role of surface charge in EHD jet printing technique. In general, GaP intermediate shell has been introduced in III-V colloidal InP quantum dots (QDs) to enhance their thermal stability and quantum efficiency in the case of type-I core/shell/shell heterostructure InP/GaP/ZnSeS QDs. Herein, these highly luminescent InP/GaP/ZnSeS QDs were synthesized and applied to EHD jet printing, by which this study demonstrates that unreacted Ga and Cl ions on the QD surface induce the operating voltage of cone jet and cone jet formation to be reduced and stabilized, respectively. This result indicates GaP intermediate shell not only improves PL QY and thermal stability of InP QDs but also adjusts the critical flow rate required for cone-jet formation. In other words, surface charges of quantum dots can have a significant role in forming cone apex in the EHD capillary nozzle. For an industrially convenient validation of surface charges on the QD surface, Zeta potential analyses of QD solutions as a simple method were performed, as well as inductively coupled plasma optical emission spectrometry (ICP-OES) for a composition of elements. Beyond the generation of highly emissive InP QDs with narrow FWHM, these studies talk about the connection between QD material and QD devices not only to make it a vital jumping-off point for industrially feasible applications but also to reveal from chemical and physical standpoints the origin that obstructs the improvement of device performance experimentally and theoretically.}, language = {en} } @phdthesis{Lepre2023, author = {Lepre, Enrico}, title = {Nitrogen-doped carbonaceous materials for energy and catalysis}, doi = {10.25932/publishup-57739}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-577390}, school = {Universit{\"a}t Potsdam}, pages = {153}, year = {2023}, abstract = {Facing the environmental crisis, new technologies are needed to sustain our society. In this context, this thesis aims to describe the properties and applications of carbon-based sustainable materials. In particular, it reports the synthesis and characterization of a wide set of porous carbonaceous materials with high nitrogen content obtained from nucleobases. These materials are used as cathodes for Li-ion capacitors, and a major focus is put on the cathode preparation, highlighting the oxidation resistance of nucleobase-derived materials. Furthermore, their catalytic properties for acid/base and redox reactions are described, pointing to the role of nitrogen speciation on their surfaces. Finally, these materials are used as supports for highly dispersed nickel loading, activating the materials for carbon dioxide electroreduction.}, language = {en} } @article{GhassemiOpitzBraemeretal.2023, author = {Ghassemi, Novid and Opitz, Ben and Br{\"a}mer, Martin and Gasparjan, David and Sambanis, Michaela and K{\"o}ster, Hilde and L{\"u}cke, Martin and Nordmeier, Volkhard}, title = {Das „Lehr-Lern-Labor" als Lehrkonzept zur F{\"o}rderung einer reflexiven Haltung bei Lehramtsstudent:nnen unterschiedlicher F{\"a}cher}, series = {Reflexion in der Lehrkr{\"a}ftebildung: Empirisch - Phasen{\"u}bergreifend - Interdisziplin{\"a}r (Potsdamer Beitr{\"a}ge zur Lehrerbildung und Bildungsforschung ; 4)}, journal = {Reflexion in der Lehrkr{\"a}ftebildung: Empirisch - Phasen{\"u}bergreifend - Interdisziplin{\"a}r (Potsdamer Beitr{\"a}ge zur Lehrerbildung und Bildungsforschung ; 4)}, number = {4}, editor = {Mientus, Lukas and Klempin, Christiane and Nowak, Anna}, publisher = {Universit{\"a}tsverlag Potsdam}, address = {Potsdam}, isbn = {978-3-86956-566-8}, issn = {2626-3556}, doi = {10.25932/publishup-63192}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-631924}, pages = {389 -- 396}, year = {2023}, abstract = {Eine reflexive Haltung gegen{\"u}ber der eigenen Lehrt{\"a}tigkeit gilt als Schl{\"u}sselqualifikation in Bezug auf die Professionalisierung von Lehrer:innen in allen Didaktiken (GFD, 2004, S. 4). Das universit{\"a}re Seminarformat Lehr-Lern-Labor (LLLS) kann diese Haltung f{\"o}rdern (Rehfeldt et al., 2018). Das Lehrformat eignet sich außerdem zur Steigerung des Professionswissens und der unterrichtlichen Handlungsf{\"a}higkeit angehender Lehrer:innen (Rehfeldt et al., 2020; Br{\"a}mer \& K{\"o}ster, 2021). Dieser Beitrag stellt, neben der grunds{\"a}tzlichen Konzeption des Seminarformats, dessen Implementierung in vier verschiedenen Fachdidaktiken (Didaktiken des Englischen, der Geschichte, der Physik und Sachunterricht und seine Didaktik) vor. Ein Fokus liegt dabei auf der unterschiedlichen Umsetzung der Reflexionsphasen.}, language = {de} } @book{MientusKlempinNowaketal.2023, author = {Mientus, Lukas and Klempin, Christiane and Nowak, Anna and Wyss, Corinne and Aufschnaiter, Claudia von and Faix, Ann-Christin and te Poel, Kathrin and Wahbe, Nadia and Pieper, Martin and H{\"o}ller, Katharina and Kallenbach, Lea and F{\"o}rster, Magdalena and Redecker, Anke and Dick, Mirjam and Holle, J{\"o}rg and Schneider, Edina and Rehfeldt, Daniel and Brauns, Sarah and Abels, Simone and Ferencik-Lehmkuhl, Daria and Fr{\"a}nkel, Silvia and Frohn, Julia and Liebsch, Ann-Catherine and Pech, Detlef and Schreier, Pascal and Jessen, Moiken and Großmann, Uta and Skintey, Lesya and Voerkel, Paul and Vaz Ferreira, Mergenfel A. and Zimmermann, Jan-Simon and Buddeberg, Magdalena and Henke, Vanessa and Hornberg, Sabine and V{\"o}lschow, Yvette and Warrelmann, Julia-Nadine and Malek, Jennifer and Tinnefeld, Anja and Schmidt, Peggy and Bauer, Tobias and J{\"a}nisch, Christopher and Spitzer, Lisa and Franken, Nadine and Degeling, Maria and Preisfeld, Angelika and Meier, Jana and K{\"u}th, Simon and Scholl, Daniel and Vogelsang, Christoph and Watson, Christina and Weißbach, Anna and Kulgemeyer, Christoph and Oetken, Mandy and Gorski, Sebastian and Kubsch, Marcus and Sorge, Stefan and Wulff, Peter and Fellenz, Carolin D. and Schnell, Susanne and Larisch, Cathleen and Kaiser, Franz and Knott, Christina and Reimer, Stefanie and Stegm{\"u}ller, Nathalie and Boukray{\^a}a Trabelsi, Kathrin and Schißlbauer, Franziska and Lemberger, Lukas and Barth, Ulrike and Wiehl, Angelika and Rogge, Tim and B{\"o}hnke, Anja and Dietz, Dennis and Großmann, Leroy and Wienmeister, Annett and Zoppke, Till and Jiang, Lisa and Gr{\"u}nbauer, Stephanie and Ostersehlt, D{\"o}rte and Peukert, Sophia and Sch{\"a}fer, Christoph and L{\"o}big, Anna and Br{\"o}ll, Leena and Brandt, Birgit and Breuer, Meike and Dausend, Henriette and Krelle, Michael and Andersen, Gesine and Falke, Sascha and Kindermann-G{\"u}zel, Kristin and K{\"o}rner, Katrina and Lottermoser, Lisa-Marie and P{\"u}gner, Kati and Sonnenburg, Nadine and Akarsu, Selim and Rechl, Friederike and Gadinger, Laureen and Heinze, Lena and Wittmann, Eveline and Franke, Manuela and Lachmund, Anne-Marie and B{\"o}ttger, Julia and Hannover, Bettina and Behrendt, Renata and Conty, Valentina and Grundmann, Stephanie and Ghassemi, Novid and Opitz, Ben and Br{\"a}mer, Martin and Gasparjan, David and Sambanis, Michaela and K{\"o}ster, Hilde and L{\"u}cke, Martin and Nordmeier, Volkhard and Schaal, Sonja and Haberbosch, Maximilian and Meissner, Maren and Schaal, Steffen and Br{\"u}chner, Melanie and Riehle, Tamara and Leopold, Bengta Marie and Gerlach, Susanne and Rau-Patschke, Sarah and Skorsetz, Nina and Weber, Nadine and Damk{\"o}hler, Jens and Elsholz, Markus and Trefzger, Thomas and Lewek, Tobias and Borowski, Andreas}, title = {Reflexion in der Lehrkr{\"a}ftebildung}, series = {Potsdamer Beitr{\"a}ge f{\"u}r Lehrkr{\"a}ftebildung und Bildungsforschung}, journal = {Potsdamer Beitr{\"a}ge f{\"u}r Lehrkr{\"a}ftebildung und Bildungsforschung}, number = {4}, editor = {Mientus, Lukas and Klempin, Christiane and Nowak, Anna}, publisher = {Universit{\"a}tsverlag Potsdam}, address = {Potsdam}, isbn = {978-3-86956-566-8}, issn = {2626-3556}, doi = {10.25932/publishup-59171}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-591717}, publisher = {Universit{\"a}t Potsdam}, pages = {452}, year = {2023}, abstract = {Reflexion ist eine Schl{\"u}sselkategorie f{\"u}r die professionelle Entwicklung von Lehrkr{\"a}ften, welche als Ausbildungsziel in den Bildungsstandards f{\"u}r die Lehrkr{\"a}ftebildung verankert ist. Eine Verstetigung universit{\"a}r gepr{\"a}gter Forschung und Modellierung in der praxisnahen Anwendung im schulischen Kontext bietet Potentiale nachhaltiger Professionalisierung. Die St{\"a}rkung reflexionsbezogener Kompetenzen durch Empirie und Anwendung scheint eine phasen{\"u}bergreifende Herausforderung der Lehrkr{\"a}ftebildung zu sein, die es zu bew{\"a}ltigen gilt. Ziele des Tagungsbandes Reflexion in der Lehrkr{\"a}ftebildung sind eine theoretische Sch{\"a}rfung des Konzeptes „Reflexive Professionalisierung" und der Austausch {\"u}ber Fragen der Einbettung wirksamer reflexionsbezogener Lerngelegenheiten in die Lehrkr{\"a}ftebildung. Forschende und Lehrende der‚ drei Phasen (Studium, Referendariat sowie Fort- und Weiterbildung) der Lehrkr{\"a}ftebildung stellen Lehrkonzepte und Forschungsprojekte zum Thema Reflexion in der Lehrkr{\"a}ftebildung vor und diskutieren diese. Gemeinsam mit Teilnehmenden aller Phasen und von verschiedenen Standorten der Lehrkr{\"a}ftebildung werden zuk{\"u}nftige Herausforderungen identifiziert und L{\"o}sungsans{\"a}tze herausgearbeitet.}, language = {de} } @article{FrankenDegelingPreisfeld2023, author = {Franken, Nadine and Degeling, Maria and Preisfeld, Angelika}, title = {Am Puls der (digitalen) Zeit?}, series = {Reflexion in der Lehrkr{\"a}ftebildung: Empirisch - Phasen{\"u}bergreifend - Interdisziplin{\"a}r (Potsdamer Beitr{\"a}ge zur Lehrerbildung und Bildungsforschung ; 4)}, journal = {Reflexion in der Lehrkr{\"a}ftebildung: Empirisch - Phasen{\"u}bergreifend - Interdisziplin{\"a}r (Potsdamer Beitr{\"a}ge zur Lehrerbildung und Bildungsforschung ; 4)}, number = {4}, editor = {Mientus, Lukas and Klempin, Christiane and Nowak, Anna}, publisher = {Universit{\"a}tsverlag Potsdam}, address = {Potsdam}, isbn = {978-3-86956-566-8}, issn = {2626-3556}, doi = {10.25932/publishup-63140}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-631402}, pages = {221 -- 231}, year = {2023}, abstract = {In diesem Beitrag wird ein geplantes digitales Lehrkonzept f{\"u}r die universit{\"a}re Begleitung des Praxissemesters in den F{\"a}chern Biologie und Mathematik vorgestellt. Darin setzen sich Studierende im Praxissemester selbstst{\"a}ndig fachspezifische Schwerpunkte f{\"u}r die Planung, Durchf{\"u}hrung und Reflexion von Unterrichtsprojekten in der Schule. Optimalerweise ergibt sich aus den Unterrichtsprojekten auch eine fachbezogene Fragestellung, die von den Studierenden im Zuge Forschenden Lernens ergr{\"u}ndet werden kann. Begleitet wird der gesamte Prozess durch systematisch angeleitete E-Peer-Assessments (E-PA). Dabei treten Studierende in Peers in den digitalen, schriftlichen Dialog {\"u}ber Unterricht und durchlaufen gemeinsam Reflexions- und Feedbackschleifen, welche durch die universit{\"a}re Seminarleitung instruiert werden.}, language = {de} } @article{Grossmann2023, author = {Großmann, Uta}, title = {„Das hast du mich gestern schon gefragt!"}, series = {Reflexion in der Lehrkr{\"a}ftebildung: Empirisch - Phasen{\"u}bergreifend - Interdisziplin{\"a}r (Potsdamer Beitr{\"a}ge zur Lehrerbildung und Bildungsforschung ; 4)}, journal = {Reflexion in der Lehrkr{\"a}ftebildung: Empirisch - Phasen{\"u}bergreifend - Interdisziplin{\"a}r (Potsdamer Beitr{\"a}ge zur Lehrerbildung und Bildungsforschung ; 4)}, number = {4}, editor = {Mientus, Lukas and Klempin, Christiane and Nowak, Anna}, publisher = {Universit{\"a}tsverlag Potsdam}, address = {Potsdam}, isbn = {978-3-86956-566-8}, issn = {2626-3556}, doi = {10.25932/publishup-62916}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-629162}, pages = {155 -- 166}, year = {2023}, abstract = {Reflexion wird in diesem Artikel als R{\"u}ckmeldung (Feedback) zu einem Sprachlernstand begriffen. Es soll anhand eines Fallbeispiels (IRF-Sequenz) aus dem Unterricht Deutsch als Zweitsprache (DaZ) der Frage nachgegangen werden, wie sich die Feedback-Interaktion gestaltet und inwiefern sich ihr Gelingen oder Misslingen erkl{\"a}ren l{\"a}sst. Dazu wird die evidenzbasierte Forschung zum effektiven Feedback nach Hattie (u. a. Hattie 2020; Hattie \& Zierer 2020; Wisniewski \& Zierer 2018) in die Analyse einbezogen. Zu wissen, welche Wirkung Feedbacks erzielen, hilft (angehenden) Lehrer:innen, das eigene Handeln zu reflektieren.}, language = {de} } @article{Skintey2023, author = {Skintey, Lesya}, title = {Modellierung und F{\"o}rderung der Reflexion bei angehenden Lehrer:innen im DaF*Z-Bereich}, series = {Reflexion in der Lehrkr{\"a}ftebildung: Empirisch - Phasen{\"u}bergreifend - Interdisziplin{\"a}r (Potsdamer Beitr{\"a}ge zur Lehrerbildung und Bildungsforschung ; 4)}, journal = {Reflexion in der Lehrkr{\"a}ftebildung: Empirisch - Phasen{\"u}bergreifend - Interdisziplin{\"a}r (Potsdamer Beitr{\"a}ge zur Lehrerbildung und Bildungsforschung ; 4)}, number = {4}, editor = {Mientus, Lukas and Klempin, Christiane and Nowak, Anna}, publisher = {Universit{\"a}tsverlag Potsdam}, address = {Potsdam}, isbn = {978-3-86956-566-8}, issn = {2626-3556}, doi = {10.25932/publishup-63131}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-631316}, pages = {167 -- 174}, year = {2023}, abstract = {Die Professionalisierung angehender Lehrer:innen f{\"u}r Fragen rund um sprachliche Bildung, Deutsch als Zweitsprache und Mehrsprachigkeit ist in den letzten Jahren verst{\"a}rkt in den Blick der Praxis und Forschung der Lehrer:innenbildung ger{\"u}ckt. W{\"a}hrend der Fachdiskurs im Hinblick auf die Konstrukte (Handlungs-)Kompetenz und Einstellungen bereits vorgeschritten ist, stellen die Modellierung und Erforschung des Konstrukts Reflexion im Fach Deutsch als Fremd- und Zweitsprache (DaF*Z) noch ein Desiderat dar. Im Beitrag wird die Fachspezifik der Reflexion als eines der Qualifizierungsziele der Ausbildung von Lehrer:innen f{\"u}r die sprachlich und kulturell heterogene Sch{\"u}lerschaft diskutiert und eine Modellierung vorgestellt.}, language = {de} } @article{VoerkelVazFerreira2023, author = {Voerkel, Paul and Vaz Ferreira, Mergenfel A.}, title = {Reflexion im Dialog}, series = {Reflexion in der Lehrkr{\"a}ftebildung: Empirisch - Phasen{\"u}bergreifend - Interdisziplin{\"a}r (Potsdamer Beitr{\"a}ge zur Lehrerbildung und Bildungsforschung ; 4)}, journal = {Reflexion in der Lehrkr{\"a}ftebildung: Empirisch - Phasen{\"u}bergreifend - Interdisziplin{\"a}r (Potsdamer Beitr{\"a}ge zur Lehrerbildung und Bildungsforschung ; 4)}, number = {4}, editor = {Mientus, Lukas and Klempin, Christiane and Nowak, Anna}, publisher = {Universit{\"a}tsverlag Potsdam}, address = {Potsdam}, isbn = {978-3-86956-566-8}, issn = {2626-3556}, doi = {10.25932/publishup-63132}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-631325}, pages = {175 -- 182}, year = {2023}, abstract = {Fast 40 Jahre nach dem Erscheinen von Donald Sch{\"o}ns Buch „The Reflective Practitioner: How Professionals Think In Action" (1984) ist das Konzept der „reflexiven Kompetenz" immer noch hochaktuell und wird daher in akademischen Kreisen weiterhin intensiv diskutiert. Der Artikel greift die Diskussionen zu diesem Thema im Bereich der Fremdsprachenlehrkr{\"a}ftebildung auf und unterstreicht sie mit Beispielen aus der universit{\"a}ren Aus- und Fortbildungspraxis f{\"u}r Deutsch als Fremd- und Zweitsprache in Brasilien und Deutschland. Auff{\"a}llig ist dabei, dass es sowohl bei den Fragestellungen als auch bei den Maßnahmen und Instrumenten zahlreiche {\"U}berschneidungen gibt. Reflexion als Ziel in der Lehrkr{\"a}ftebildung kann somit als {\"u}bergreifendes Thema wahrgenommen und weiterentwickelt werden.}, language = {de} } @article{MeierKuethScholletal.2023, author = {Meier, Jana and K{\"u}th, Simon and Scholl, Daniel and Vogelsang, Christoph and Watson, Christina}, title = {Der Zyklus von Planung und Reflexion}, series = {Reflexion in der Lehrkr{\"a}ftebildung: Empirisch - Phasen{\"u}bergreifend - Interdisziplin{\"a}r (Potsdamer Beitr{\"a}ge zur Lehrerbildung und Bildungsforschung ; 4)}, journal = {Reflexion in der Lehrkr{\"a}ftebildung: Empirisch - Phasen{\"u}bergreifend - Interdisziplin{\"a}r (Potsdamer Beitr{\"a}ge zur Lehrerbildung und Bildungsforschung ; 4)}, number = {4}, editor = {Mientus, Lukas and Klempin, Christiane and Nowak, Anna}, publisher = {Universit{\"a}tsverlag Potsdam}, address = {Potsdam}, isbn = {978-3-86956-566-8}, issn = {2626-3556}, doi = {10.25932/publishup-63142}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-631422}, pages = {233 -- 239}, year = {2023}, abstract = {Auf der Zeitachse von Zyklusmodellen des Unterrichts wird der Handlungsreflexion eine zentrale Bedeutung zugesprochen: Vor seiner Umsetzung im Unterricht soll das kommende Handeln zun{\"a}chst in einer antizipierenden Reflexion gedanklich entworfen werden, um seine Erfolgswahrscheinlichkeit zu erh{\"o}hen. Nach dem Unterricht soll es einer retrospektiven Reflexion unterzogen werden, in der die Handlungsumsetzung vor dem Hintergrund der Handlungsplanung evaluiert wird und Konsequenzen f{\"u}r k{\"u}nftige Handlungsplanungen gezogen werden. Trotz der Plausibilit{\"a}t dieses postulierten Zusammenhangs von antizipierender und retrospektiver Reflexion steht seine genauere empirische Untersuchung allerdings noch aus. In einer querschnittlichen Onlineerhebung werden diese beiden Reflexionsformen deshalb als generische Unterrichtsplanungsf{\"a}higkeit und Reflexionskompetenz spezifiziert, um ihren Zusammenhang mit Hilfe einer Stichprobe von angehenden Lehrkr{\"a}ften (N = 479) aus zwei Universit{\"a}ten zu explorieren. Die gefundenen schwachen Zusammenh{\"a}nge werden vor dem Hintergrund der Operationalisierungen und der Testmotivation der Teilnehmenden diskutiert.}, language = {de} } @article{WeissbachKulgemeyer2023, author = {Weißbach, Anna and Kulgemeyer, Christoph}, title = {Physikunterricht reflektieren}, series = {Reflexion in der Lehrkr{\"a}ftebildung: Empirisch - Phasen{\"u}bergreifend - Interdisziplin{\"a}r (Potsdamer Beitr{\"a}ge zur Lehrerbildung und Bildungsforschung ; 4)}, journal = {Reflexion in der Lehrkr{\"a}ftebildung: Empirisch - Phasen{\"u}bergreifend - Interdisziplin{\"a}r (Potsdamer Beitr{\"a}ge zur Lehrerbildung und Bildungsforschung ; 4)}, number = {4}, editor = {Mientus, Lukas and Klempin, Christiane and Nowak, Anna}, publisher = {Universit{\"a}tsverlag Potsdam}, address = {Potsdam}, isbn = {978-3-86956-566-8}, issn = {2626-3556}, doi = {10.25932/publishup-63143}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-631432}, pages = {241 -- 247}, year = {2023}, abstract = {Obwohl der Reflexion von Unterricht eine zentrale Bedeutung f{\"u}r Lehrkr{\"a}fte zukommt, ist die Reflexionsf{\"a}higkeit von Lehramtsstudierenden oftmals nur gering ausgepr{\"a}gt und wird auch in Praxisphasen nicht automatisch weiterentwickelt. Es besteht also bereits im Studium ein Bedarf, die Studierenden bei der Entwicklung dieser F{\"a}higkeit zu unterst{\"u}tzen. Hier soll die nachfolgend vorgestellte Lernumgebung ansetzen und eine systematische Erfassung, R{\"u}ckmeldung und F{\"o}rderung der Reflexionsf{\"a}higkeit erm{\"o}glichen. Die Lernumgebung ist f{\"u}r das Lehramtsstudium im Fach Physik entwickelt und besteht aus einem Diagnoseinstrument mit daran anschließendem Assessment-Feedback und F{\"o}rdermaterial. Erste Untersuchungen zur Validit{\"a}t zeigen, dass die Studierenden w{\"a}hrend der Bearbeitung des Diagnoseinstruments inhaltlich relevante {\"U}berlegungen anstellen sowie das erhaltene Assessment-Feedback inhaltlich sinnvoll interpretieren und auch dem F{\"o}rdermaterial einen Mehrwert f{\"u}r ihre Professionalisierung zusprechen.}, language = {de} } @article{VoelschowWarrelmann2023, author = {V{\"o}lschow, Yvette and Warrelmann, Julia-Nadine}, title = {Reflexionsanregung in der Lehrkr{\"a}ftebildung per ePortfolioarbeit}, series = {Reflexion in der Lehrkr{\"a}ftebildung: Empirisch - Phasen{\"u}bergreifend - Interdisziplin{\"a}r (Potsdamer Beitr{\"a}ge zur Lehrerbildung und Bildungsforschung ; 4)}, journal = {Reflexion in der Lehrkr{\"a}ftebildung: Empirisch - Phasen{\"u}bergreifend - Interdisziplin{\"a}r (Potsdamer Beitr{\"a}ge zur Lehrerbildung und Bildungsforschung ; 4)}, number = {4}, editor = {Mientus, Lukas and Klempin, Christiane and Nowak, Anna}, publisher = {Universit{\"a}tsverlag Potsdam}, address = {Potsdam}, isbn = {978-3-86956-566-8}, issn = {2626-3556}, doi = {10.25932/publishup-63135}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-631354}, pages = {191 -- 197}, year = {2023}, abstract = {Seit 2016 wird ePortfolioarbeit an der Universit{\"a}t Vechta im Rahmen der vom BMBF gef{\"o}rderten Qualit{\"a}tsoffensive Lehrerbildung (QLB) Projekte (BRIDGES I und II) mit einem eigens daf{\"u}r entwickelten digitalen Tool konzeptioniert, implementiert und formativ evaluiert. {\"U}ber entsprechende Aufgabenstellungen wird dabei studiumsbegleitend und insbesondere in Praxisphasen auf die Anregung von Reflexivit{\"a}t, die als grundlegende Schl{\"u}sselkompetenz p{\"a}dagogischer Professionalit{\"a}t verstanden wird, fokussiert. Im Beitrag werden die Konzeptionierung und Implementierung digitaler Portfolioarbeit inkl. Anlassbeispielen zur Anregung von Reflexion in der Lehrkr{\"a}ftebildung vorgestellt. Zudem werden Chancen und Grenzen der Reflexionsanregung unter Zuhilfenahme eines digitalen Portfolios diskutiert. Dabei unterst{\"u}tzt auch die Betrachtung von Gelingensbedingungen f{\"u}r digitale Reflexionsanregung.}, language = {de} } @article{SchmidtBauerJaenisch2023, author = {Schmidt, Peggy and Bauer, Tobias and J{\"a}nisch, Christopher}, title = {Kumulativer Aufbau der Reflexionskompetenz in den schulpraktischen Phasen der Lehrkr{\"a}ftebildung}, series = {Reflexion in der Lehrkr{\"a}ftebildung: Empirisch - Phasen{\"u}bergreifend - Interdisziplin{\"a}r (Potsdamer Beitr{\"a}ge zur Lehrerbildung und Bildungsforschung ; 4)}, journal = {Reflexion in der Lehrkr{\"a}ftebildung: Empirisch - Phasen{\"u}bergreifend - Interdisziplin{\"a}r (Potsdamer Beitr{\"a}ge zur Lehrerbildung und Bildungsforschung ; 4)}, number = {4}, editor = {Mientus, Lukas and Klempin, Christiane and Nowak, Anna}, publisher = {Universit{\"a}tsverlag Potsdam}, address = {Potsdam}, isbn = {978-3-86956-566-8}, issn = {2626-3556}, doi = {10.25932/publishup-63137}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-631371}, pages = {207 -- 213}, year = {2023}, abstract = {Die Reflexionskompetenz wird als zentrale Bedingung zur Professionalisierung im Lehrberuf angesehen. Um diese im Verlauf der Lehrkr{\"a}ftebildung zu entwickeln, m{\"u}ssen Etappenziele beschrieben werden, die sowohl das Lehramtsstudium als auch den Vorbereitungsdienst in den Blick nehmen. Ausbildende beider Phasen der Lehrkr{\"a}ftebildung haben dazu ein Kompetenzraster erarbeitet. Dieses soll einen Beitrag dazu leisten, die Progression der Reflexionskompetenz anhand von Handlungsschritten zu beschreiben. Den Handlungsschritten werden dann wiederum Entwicklungsstufen f{\"u}r die jeweiligen Praxisphasen (Blockpraktikum A, Schulpraktische {\"U}bungen, Blockpraktikum B, 2. Phase Ende) zugeordnet, die den Auspr{\"a}gungsgrad der Reflexionskompetenz darstellen.}, language = {de} } @article{ZimmermannBuddebergHenkeetal.2023, author = {Zimmermann, Jan-Simon and Buddeberg, Magdalena and Henke, Vanessa and Hornberg, Sabine}, title = {Soziale Teilhabe im Unterricht}, series = {Reflexion in der Lehrkr{\"a}ftebildung: Empirisch - Phasen{\"u}bergreifend - Interdisziplin{\"a}r (Potsdamer Beitr{\"a}ge zur Lehrerbildung und Bildungsforschung ; 4)}, journal = {Reflexion in der Lehrkr{\"a}ftebildung: Empirisch - Phasen{\"u}bergreifend - Interdisziplin{\"a}r (Potsdamer Beitr{\"a}ge zur Lehrerbildung und Bildungsforschung ; 4)}, number = {4}, editor = {Mientus, Lukas and Klempin, Christiane and Nowak, Anna}, publisher = {Universit{\"a}tsverlag Potsdam}, address = {Potsdam}, isbn = {978-3-86956-566-8}, issn = {2626-3556}, doi = {10.25932/publishup-63134}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-631340}, pages = {183 -- 188}, year = {2023}, abstract = {Im Rahmen der F{\"o}rderung sozialer Teilhabe von Sch{\"u}ler:innen im Unterricht ben{\"o}tigen Lehrkr{\"a}fte Reflexionskompetenzen, die es ihnen erm{\"o}glichen, mit den damit verbundenen Antinomien umzugehen. Davon ausgehend wird in diesem Beitrag ein Lehr-/Lernkonzept vorgestellt, welches auf die F{\"o}rderung von Lehramtsstudierenden im Sinne einer reflexiven Inklusion abzielt. Der Fokus liegt auf dem Einsatz der Methode des Lauten Denkens, welches die Denk- und Probleml{\"o}sungsprozesse der Studierenden beim Schauen von Unterrichtsvideos introspektiv erfasst. Das laut Gedachte wird anschließend f{\"u}r Metareflexionen genutzt. Inwiefern damit (fehlende) erfahrungsbasierte und wissenschaftliche Formen p{\"a}dagogischen Wissens thematisiert und prozessbegleitend begegnet werden k{\"o}nnen, um eine Entwicklung von kritisch-reflexiven Kompetenzen zu f{\"o}rdern, wurde in einer Pilotphase im Rahmen eines Seminars erprobt. Erg{\"a}nzend wurde die Anwendung des Lauten Denkens bei einzelnen Studierenden videographiert. Dazu werden erste Ergebnisse vorgestellt und ein Ausblick auf die weitere Nutzung und Erforschung der Methode f{\"u}r die F{\"o}rderung von Reflexionsprozessen bei Lehramtsstudierenden im Seminarkontext gegeben.}, language = {de} } @article{JiangGruenbauerOstersehlt2023, author = {Jiang, Lisa and Gr{\"u}nbauer, Stephanie and Ostersehlt, D{\"o}rte}, title = {Einsatz von Unterrichtsvideos zur F{\"o}rderung eines fachdidaktisch fundierten Reflexionsverst{\"a}ndnisses bei Biologielehramtsstudierenden}, series = {Reflexion in der Lehrkr{\"a}ftebildung: Empirisch - Phasen{\"u}bergreifend - Interdisziplin{\"a}r (Potsdamer Beitr{\"a}ge zur Lehrerbildung und Bildungsforschung ; 4)}, journal = {Reflexion in der Lehrkr{\"a}ftebildung: Empirisch - Phasen{\"u}bergreifend - Interdisziplin{\"a}r (Potsdamer Beitr{\"a}ge zur Lehrerbildung und Bildungsforschung ; 4)}, number = {4}, editor = {Mientus, Lukas and Klempin, Christiane and Nowak, Anna}, publisher = {Universit{\"a}tsverlag Potsdam}, address = {Potsdam}, isbn = {978-3-86956-566-8}, issn = {2626-3556}, doi = {10.25932/publishup-63152}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-631520}, pages = {317 -- 325}, year = {2023}, abstract = {Zur Reflexionsf{\"o}rderung wurde 2017/18 ein Aufgabenkonzept f{\"u}r Biologielehramtsstudierende an der Universit{\"a}t Bremen entwickelt, das gezielt im ersten fachdidaktischen Schulpraktikum eingesetzt wurde. Die ausgewerteten e-Portfolios zeigten, dass die studentischen Reflexionen die Dimensionen Theorieeinbezug, Perspektiven{\"u}bernahme, Handlungsalternativen und Professionalisierung ber{\"u}cksichtigen, jedoch in den einzelnen Dimensionen nur durchschnittliche Ergebnisse in der Tiefe erzielt wurden. Deswegen wurde eine Intervention f{\"u}r die erste Phase der Lehrer:innenbildung entwickelt, die nach dem Design-Based Research-Ansatz (DBR) iterativ adaptiert wird und fremde Unterrichtsvideos einbindet. Ziel der Studie ist es, zu untersuchen, inwieweit die Intervention die fachdidaktische Reflexion in die Tiefe f{\"o}rdert. Als Datengrundlage wurden 28 Reflexionen inhaltsanalytisch ausgewertet. Erste Ergebnisse stellen dar, dass die Reflexionen hinsichtlich der Handlungsalternativen und der Professionalisierung von insgesamt vier Niveaustufen {\"u}berwiegend die Niveaustufen 2 und 3 erreichen. Die Reflexionsdimensionen Theorieeinbezug und Perspektiven{\"u}bernahme erfolgen hingegen auf Stufe 2, jedoch selten auf einer h{\"o}heren Stufe. Die Ergebnisse werden hinsichtlich des weiteren Vorgehens diskutiert.}, language = {de} } @article{Rogge2023, author = {Rogge, Tim}, title = {Reflexion - besser digital?}, series = {Reflexion in der Lehrkr{\"a}ftebildung: Empirisch - Phasen{\"u}bergreifend - Interdisziplin{\"a}r (Potsdamer Beitr{\"a}ge zur Lehrerbildung und Bildungsforschung ; 4)}, journal = {Reflexion in der Lehrkr{\"a}ftebildung: Empirisch - Phasen{\"u}bergreifend - Interdisziplin{\"a}r (Potsdamer Beitr{\"a}ge zur Lehrerbildung und Bildungsforschung ; 4)}, number = {4}, editor = {Mientus, Lukas and Klempin, Christiane and Nowak, Anna}, publisher = {Universit{\"a}tsverlag Potsdam}, address = {Potsdam}, isbn = {978-3-86956-566-8}, issn = {2626-3556}, doi = {10.25932/publishup-63150}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-631504}, pages = {301 -- 307}, year = {2023}, abstract = {Die Einf{\"u}hrung des Praxissemesters in allen Lehramtsstudieng{\"a}ngen in NRW wurde mit der Forderung nach einer theoriegeleiteten Reflexion schulpraktischer Erfahrungen verbunden. Empirische Befunde deuten an, dass mithilfe videografierter Unterrichtsszenen eine F{\"o}rderung der Reflexionskompetenz von Studierenden m{\"o}glich ist. Vor diesem Hintergrund wurde im Wintersemester 2020 an der Universit{\"a}t Paderborn eine quasi-experimentelle Studie mit dem Ziel durchgef{\"u}hrt, die Entwicklung der F{\"a}higkeit zur videobasierten Reflexion eigenen Unterrichtshandelns in realen Unterrichtssituationen im Kontrollgruppenvergleich zu untersuchen. Dabei reflektierte eine Versuchsgruppe Videovignetten des eigenen Unterrichts ohne weitere Hilfsmittel w{\"a}hrend eine andere Versuchsgruppe mithilfe einer digitalen Lernumgebung reflektierte, die die M{\"o}glichkeit zum Setzen von Sprungmarken, Annotationen und (kollaborativer) Kommentierung des Videos bot. Eine Kontrollgruppe reflektierte den eigenen Unterricht erinnerungs- und textbasiert. Die Ergebnisse weisen darauf hin, dass die Nutzung der digitalen Lernumgebung zu einer st{\"a}rkeren Entwicklung der Reflexionskompetenz beitragen k{\"o}nnte.}, language = {de} } @article{KnottReimerStegmuelleretal.2023, author = {Knott, Christina and Reimer, Stefanie and Stegm{\"u}ller, Nathalie and Boukray{\^a}a Trabelsi, Kathrin and Schißlbauer, Franziska and Lemberger, Lukas}, title = {Reflektieren videografierter Erkl{\"a}rungen im Projekt FALKE-e}, series = {Reflexion in der Lehrkr{\"a}ftebildung: Empirisch - Phasen{\"u}bergreifend - Interdisziplin{\"a}r (Potsdamer Beitr{\"a}ge zur Lehrerbildung und Bildungsforschung ; 4)}, journal = {Reflexion in der Lehrkr{\"a}ftebildung: Empirisch - Phasen{\"u}bergreifend - Interdisziplin{\"a}r (Potsdamer Beitr{\"a}ge zur Lehrerbildung und Bildungsforschung ; 4)}, number = {4}, editor = {Mientus, Lukas and Klempin, Christiane and Nowak, Anna}, publisher = {Universit{\"a}tsverlag Potsdam}, address = {Potsdam}, isbn = {978-3-86956-566-8}, issn = {2626-3556}, doi = {10.25932/publishup-63148}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-631489}, pages = {287 -- 293}, year = {2023}, abstract = {Die F{\"a}higkeit zur professionellen Unterrichtsreflexion ist eine Kernkompetenz von Lehrkr{\"a}ften, um den eigenen Unterricht weiterentwickeln zu k{\"o}nnen. Schon in der Lehramtsausbildung kann diese Kompetenz aufgebaut werden. Das transdisziplin{\"a}re Projekt FALKE-e hat das Ziel, die adaptive Erkl{\"a}rkompetenz von Lehramtsstudierenden in sechs unterschiedlichen F{\"a}chern zu messen und durch Reflexion videografierter Erkl{\"a}reinheiten in fachdidaktischen Seminaren zu f{\"o}rdern. In Bezug auf das Reflektieren ergibt sich daraus die Fragestellung, inwiefern sich Zuw{\"a}chse in der Reflexionskompetenz unterscheiden, wenn Studierende ihre eigenen videografierten Erkl{\"a}rungen (Selbstreflexion) oder die videografierten Erkl{\"a}rungen von Peers reflektieren (Fremdreflexion). In einer ersten Phase entwickeln Studierende in fachdidaktischen Seminaren Erkl{\"a}reinheiten. Ein Teil der Studierenden (ca. 25 pro Fach) erprobt diese selbst in der Schule und wird dabei videografiert. Die {\"u}brigen Studierenden (ca. 25 pro Fach) beobachten die videografierten Erkl{\"a}rungen der anderen. Beide Gruppen reflektieren die Erkl{\"a}rungen und {\"u}berarbeiten auf Basis der Reflexion die eigenen Erkl{\"a}rungen. Das Vorgehen wird anschließend in einer zweiten Phase von beiden Gruppen analog wiederholt.}, language = {de} } @article{DamkoehlerElsholzTrefzger2023, author = {Damk{\"o}hler, Jens and Elsholz, Markus and Trefzger, Thomas}, title = {Qualit{\"a}t von Reflexionsprozessen}, series = {Reflexion in der Lehrkr{\"a}ftebildung: Empirisch - Phasen{\"u}bergreifend - Interdisziplin{\"a}r (Potsdamer Beitr{\"a}ge zur Lehrerbildung und Bildungsforschung ; 4)}, journal = {Reflexion in der Lehrkr{\"a}ftebildung: Empirisch - Phasen{\"u}bergreifend - Interdisziplin{\"a}r (Potsdamer Beitr{\"a}ge zur Lehrerbildung und Bildungsforschung ; 4)}, number = {4}, editor = {Mientus, Lukas and Klempin, Christiane and Nowak, Anna}, publisher = {Universit{\"a}tsverlag Potsdam}, address = {Potsdam}, isbn = {978-3-86956-566-8}, issn = {2626-3556}, doi = {10.25932/publishup-63198}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-631980}, pages = {431 -- 436}, year = {2023}, abstract = {Inwiefern beg{\"u}nstigt die F{\"a}higkeit zur Fremdreflexion die Selbstreflexionsf{\"a}higkeit? Welche Rolle spielen affektiv-motivationale Dispositionen der Reflektierenden? Praxisveranstaltungen wird in der Lehrkr{\"a}ftebildung eine bedeutende Rolle zugeschrieben. Eine m{\"o}gliche Ausgestaltung sind Lehr-Lern-Labore mit iterativen Ans{\"a}tzen. Studierende f{\"u}hren dabei an mehreren Durchf{\"u}hrungstagen in zeitlichem Abstand außerschulischen Unterricht mit kleineren Sch{\"u}ler:innengruppen durch. Zwischen den einzelnen Erprobungen finden {\"U}berarbeitungen der verwendeten Materialien und Erkl{\"a}rungen statt. Ergebnisse aus der Forschung erlauben die Interpretation, dass f{\"u}r die Professionalisierung von Lehrpersonen die Qualit{\"a}t der ablaufenden Reflexionsprozesse bedeutsam ist. Die geplante Studie im Rahmen des Lehr-Lern-Labor-Seminars Physik an der Universit{\"a}t W{\"u}rzburg m{\"o}chte m{\"o}gliche Zusammenh{\"a}nge zwischen unterschiedlichen Ans{\"a}tzen der Qualit{\"a}tsbestimmung genauer beleuchten. Begleitend zum Lehr-Lern-Labor-Seminar mit Phasen intensiver Selbstreflexion werden die Entwicklung von Fremd- und Selbstreflexionsf{\"a}higkeit sowie die Reflexionsbereitschaft bei Studierenden erhoben und Zusammenh{\"a}nge zwischen diesen untersucht.}, language = {de} } @article{BarthWiehl2023, author = {Barth, Ulrike and Wiehl, Angelika}, title = {Wahrnehmungsvignetten als Zugang zur „Reflexiven Professionalisierung" in der Lehrkr{\"a}ftebildung}, series = {Reflexion in der Lehrkr{\"a}ftebildung: Empirisch - Phasen{\"u}bergreifend - Interdisziplin{\"a}r (Potsdamer Beitr{\"a}ge zur Lehrerbildung und Bildungsforschung ; 4)}, journal = {Reflexion in der Lehrkr{\"a}ftebildung: Empirisch - Phasen{\"u}bergreifend - Interdisziplin{\"a}r (Potsdamer Beitr{\"a}ge zur Lehrerbildung und Bildungsforschung ; 4)}, number = {4}, editor = {Mientus, Lukas and Klempin, Christiane and Nowak, Anna}, publisher = {Universit{\"a}tsverlag Potsdam}, address = {Potsdam}, isbn = {978-3-86956-566-8}, issn = {2626-3556}, doi = {10.25932/publishup-63149}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-631495}, pages = {295 -- 300}, year = {2023}, abstract = {Der Beitrag handelt von einer p{\"a}dagogisch-ph{\"a}nomenologischen Zugangsweise mit Wahrnehmungsvignetten. Diese kleinen Texte beschreiben pers{\"o}nliche Erfahrungen in der p{\"a}dagogischen Arbeit mit Kindern und Jugendlichen. In den Phasen des Reflexionsprozesses stellen wir die Bez{\"u}ge zu professioneller inklusionssensibler Haltung her, geben Denkanst{\"o}ße f{\"u}r inklusiv-partizipatives Handeln im Unterricht und in anderen p{\"a}dagogischen Kontexten, verkn{\"u}pfen diese Bez{\"u}ge mit erlerntem Wissen, bspw. aus Seminaren zu kindlicher Entwicklung, kindlichem Lernen und diagnostischen Fragestellungen. Die Studierenden durchlaufen verschiedene Phasen der Reflexion mit unterschiedlichen Erkenntnisqualit{\"a}ten, wie Erschließen oder Bewusstmachen des Inhalts bzw. der Aussage einer Wahrnehmungsvignette, Herstellen von Zusammenh{\"a}ngen und Bez{\"u}gen zur Anthropologie und Entwicklungspsychologie, Begriffsbildung f{\"u}r eine p{\"a}dagogische Professionalit{\"a}t sowie Erkennen der Angemessenheit r{\"a}umlicher Strukturen und didaktischen Handelns durch Abgleich mit p{\"a}dagogischen Fachkenntnissen. Die Reflexionsprozesse unterst{\"u}tzen die Ausbildung einer professionellen Haltung und p{\"a}dagogische Handlungssensibilit{\"a}t.}, language = {de} } @article{PeukertSchaeferLoebigetal.2023, author = {Peukert, Sophia and Sch{\"a}fer, Christoph and L{\"o}big, Anna and Br{\"o}ll, Leena Kristina and Brandt, Birgit and Breuer, Meike and Dausend, Henriette and Krelle, Michael and Andersen, Gesine and Falke, Sascha and Kindermann-G{\"u}zel, Kristin and K{\"o}rner, Katrina and Lottermoser, Lisa-Marie and P{\"u}gner, Kati}, title = {Professionalisierung von Lehrkr{\"a}ften zur Bildung in der digitalen Welt}, series = {Reflexion in der Lehrkr{\"a}ftebildung: Empirisch - Phasen{\"u}bergreifend - Interdisziplin{\"a}r (Potsdamer Beitr{\"a}ge zur Lehrerbildung und Bildungsforschung ; 4)}, journal = {Reflexion in der Lehrkr{\"a}ftebildung: Empirisch - Phasen{\"u}bergreifend - Interdisziplin{\"a}r (Potsdamer Beitr{\"a}ge zur Lehrerbildung und Bildungsforschung ; 4)}, number = {4}, editor = {Mientus, Lukas and Klempin, Christiane and Nowak, Anna}, publisher = {Universit{\"a}tsverlag Potsdam}, address = {Potsdam}, isbn = {978-3-86956-566-8}, issn = {2626-3556}, doi = {10.25932/publishup-63181}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-631816}, pages = {329 -- 334}, year = {2023}, abstract = {Im BMBF-Projekt DigiLeG - digitale Lernumgebungen in der Grundschule des Zentrums f{\"u}r Lehrerbildung der Technischen Universit{\"a}t (TU) Chemnitz werden ausgehend von einem gemeinsamen Lehrkonzept in Veranstaltungen der beteiligten Fachdidaktiken gemeinsam mit Studierenden Lernumgebungen entwickelt und reflektiert, die digitale Medien lernf{\"o}rderlich in den Grundschulunterricht einbinden. Im folgenden Beitrag werden zun{\"a}chst das Lehrkonzept und seine theoretischen Grundlagen vorgestellt. Anschließend wird die praktische Umsetzung am Beispiel der Fachdidaktik Philosophieren mit Kindern (PmK) veranschaulicht. Der Beitrag schließt mit einer Zusammenfassung der Erfahrungen in der Umsetzung des Lehrkonzepts.}, language = {de} }