@phdthesis{Fandrich2016, author = {Fandrich, Artur}, title = {Untersuchung des Verhaltens von thermoresponsiven Polymeren auf Elektroden in Interaktion mit biomolekularen Systemen}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-396551}, school = {Universit{\"a}t Potsdam}, pages = {111}, year = {2016}, abstract = {Diese Arbeit befasst sich mit der Herstellung und Charakterisierung von thermoresponsiven Filmen auf Goldelektroden durch Fixierung eines bereits synthetisierten thermoresponsiven Polymers. Als Basis f{\"u}r die Entwicklung der responsiven Grenzfl{\"a}che dienten drei unterschiedliche Copolymere (Polymere I, II und III) aus der Gruppe der thermisch schaltbaren Poly(oligo(ethylenglykol)methacrylate). Die turbidimetrischen Messungen der Copolymere in L{\"o}sungen haben gezeigt, dass der Tr{\"u}bungspunkt vom pH-Wert, der Gegenwart von Salzen sowie von der Ionenst{\"a}rke der L{\"o}sung abh{\"a}ngig ist. Nach der Charakterisierung der Polymere in L{\"o}sung wurden Experimente der kovalenten Kopplung der Polymere I bis III an die Oberfl{\"a}che der Gold-Elektroden durchgef{\"u}hrt. W{\"a}hrend bei Polymeren I und II die Ankopplung auf einer Amidverbr{\"u}ckung basierte, wurde bei Polymer III als alternative Methode zur Immobilisierung eine photoinduzierte Anbindung unter gleichzeitiger Vernetzung gew{\"a}hlt. Der Nachweis der erfolgreichen Ankopplung erfolgte bei allen Polymeren elektrochemisch mittels Cyclovoltammetrie und Impedanzspektroskopie in K3/4[Fe(CN)6]-L{\"o}sungen. Wie die Ellipsometrie-Messungen zeigten, waren die erhaltenen Polymer-Filme unterschiedlich dick. Die Ankopplung {\"u}ber Amidverbr{\"u}ckung lieferte d{\"u}nne Filme (10 - 15 nm), w{\"a}hrend der photovernetzte Film deutlich dicker war (70-80 nm) und die darunter liegende Oberfl{\"a}che relativ gut isolierte. Elektrochemische Temperaturexperimente an Polymer-modifizierten Oberfl{\"a}chen in L{\"o}sungen in Gegenwart von K3/4[Fe(CN)6] zeigten, dass auch die immobilisierten Polymere I bis III responsives Temperaturverhalten zeigen. Bei Elektroden mit den immobilisierten Polymeren I und II ist der Temperaturverlauf der Parameterwerte diskontinuierlich - ab einem kritischen Punkt (37 °C f{\"u}r Polymer I und 45 °C f{\"u}r Polymer II) wird zun{\"a}chst langsame Zunahme der Peakstr{\"o}me wird deutlich schneller. Das Temperaturverhalten von Polymer III ist dagegen bis 50 °C kontinuierlich, der Peakstrom sinkt hier durchgehend. Weiterhin wurde mit den auf Polymeren II und III basierten Elektroden deren Anwendung als responsive Matrix f{\"u}r Bioerkennungsreaktionen untersucht. Es wurde die Ankopplung von kleinen Biorezeptoren, TAG-Peptiden, an Polymer II- und Polymer III-modifizierten Elektroden durchgef{\"u}hrt. Das hydrophile FLAG-TAG-Peptid ver{\"a}ndert das Temperaturverhalten des Polymer II-Films unwesentlich, da es die Hydrophilie des Netzwerkes nicht beeinflusst. Weiterhin wurde der Effekt der Ankopplung der ANTI-FLAG-TAG-Antik{\"o}rper an FLAG-TAG-modifizierte Polymer II-Filme untersucht. Es konnte gezeigt werden, dass die Antik{\"o}rper spezifisch an FLAG-TAG-modifiziertes Polymer II binden. Es wurde keine unspezifische Anbindung von ANTI-FLAG-TAG an Polymer II beobachtet. Die Temperaturexperimente haben gezeigt, dass die thermische Restrukturierung des Polymer II-FLAG-TAG-Filmes auch nach der Antik{\"o}rper-Ankopplung noch stattfindet. Der Einfluss der ANTI-FLAG-TAG-Ankopplung ist gering, da der Unterschied in der Hydrophilie zwischen Polymer II und FLAG-TAG bzw. ANTI-FLAG-TAG zu gering ist. F{\"u}r die Untersuchungen mit Polymer III-Elektroden wurde neben dem hydrophilen FLAG-TAG-Peptid das deutlich hydrophobere HA-TAG-Peptid ausgew{\"a}hlt. Wie im Falle der Polymer II Elektrode beeinflusst das gekoppelte FLAG-TAG-Peptid das Temperaturverhalten des Polymer III-Netzwerkes nur geringf{\"u}gig. Die gemessenen Stromwerte sind geringer als bei der Polymer III-Elektrode. Das Temperaturverhalten der FLAG-TAG-Elektrode {\"a}hnelt dem der reinen Polymer III-Elektrode - die Stromwerte sinken kontinuierlich bis die Temperatur von ca. 40 °C erreicht ist, bei der ein Plateau beobachtet wird. Offensichtlich ver{\"a}ndert FLAG-TAG auch in diesem Fall nicht wesentlich die Hydrophilie des Polymer III-Netzwerkes. Das an Polymer III-Elektroden gekoppelte hydrophobe HA-TAG-Peptid beeinflusst dagegen im starken Maße den Quellzustand des Netzwerkes. Die Str{\"o}me f{\"u}r die HA-TAG-Elektroden sind deutlich geringer als die f{\"u}r die FLAG-TAG-Polymer III-Elektroden, was auf geringeren Wassergehalt und dickeren Film zur{\"u}ckzuf{\"u}hren ist. Bereits ab 30 °C erfolgt der Anstieg von Stromwerten, der bei Polymer III- bzw. bei Polymer III-FLAG-TAG-Elektroden nicht beobachtet werden kann. Das gekoppelte hydrophobe HA-TAG-Peptid verdr{\"a}ngt Wasser aus dem Polymer III-Netzwerk, was in der Stauchung des Films bereits bei Raumtemperatur resultiert. Dies f{\"u}hrt dazu, dass der Film im Laufe des Temperaturanstieges kaum noch komprimiert. Die Stromwerte steigen in diesem Fall entsprechend des Anstiegs der temperaturabh{\"a}ngigen Diffusion des Redoxpaares. Diese Untersuchungen zeigen, dass das HA-TAG-Peptid als Ankermolek{\"u}l deutlich besser f{\"u}r eine potentielle Verwendung der Polymer III-Filme f{\"u}r sensorische Zwecke geeignet ist, da es sich deutlich in der Hydrophilie von Polymer III unterscheidet.}, language = {de} } @misc{Fandino2019, author = {Fandi{\~n}o, Jorge}, title = {Founded (auto)epistemic equilibrium logic satisfies epistemic splitting}, series = {Postprints der Universit{\"a}t Potsdam : Mathematisch-Naturwissenschaftliche Reihe}, journal = {Postprints der Universit{\"a}t Potsdam : Mathematisch-Naturwissenschaftliche Reihe}, number = {1060}, issn = {1866-8372}, doi = {10.25932/publishup-46968}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-469685}, pages = {671 -- 687}, year = {2019}, abstract = {In a recent line of research, two familiar concepts from logic programming semantics (unfounded sets and splitting) were extrapolated to the case of epistemic logic programs. The property of epistemic splitting provides a natural and modular way to understand programs without epistemic cycles but, surprisingly, was only fulfilled by Gelfond's original semantics (G91), among the many proposals in the literature. On the other hand, G91 may suffer from a kind of self-supported, unfounded derivations when epistemic cycles come into play. Recently, the absence of these derivations was also formalised as a property of epistemic semantics called foundedness. Moreover, a first semantics proved to satisfy foundedness was also proposed, the so-called Founded Autoepistemic Equilibrium Logic (FAEEL). In this paper, we prove that FAEEL also satisfies the epistemic splitting property something that, together with foundedness, was not fulfilled by any other approach up to date. To prove this result, we provide an alternative characterisation of FAEEL as a combination of G91 with a simpler logic we called Founded Epistemic Equilibrium Logic (FEEL), which is somehow an extrapolation of the stable model semantics to the modal logic S5.}, language = {en} } @inproceedings{FanMasuharaAotanietal.2010, author = {Fan, Yang and Masuhara, Hidehiko and Aotani, Tomoyuki and Nielson, Flemming and Nielson, Hanne Riis}, title = {AspectKE*: Security aspects with program analysis for distributed systems}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-41369}, year = {2010}, abstract = {Enforcing security policies to distributed systems is difficult, in particular, when a system contains untrusted components. We designed AspectKE*, a distributed AOP language based on a tuple space, to tackle this issue. In AspectKE*, aspects can enforce access control policies that depend on future behavior of running processes. One of the key language features is the predicates and functions that extract results of static program analysis, which are useful for defining security aspects that have to know about future behavior of a program. AspectKE* also provides a novel variable binding mechanism for pointcuts, so that pointcuts can uniformly specify join points based on both static and dynamic information about the program. Our implementation strategy performs fundamental static analysis at load-time, so as to retain runtime overheads minimal. We implemented a compiler for AspectKE*, and demonstrate usefulness of AspectKE* through a security aspect for a distributed chat system.}, language = {en} } @article{Faltermeier2013, author = {Faltermeier, Rudolf}, title = {The German Banking System}, series = {Protokollband 2013}, journal = {Protokollband 2013}, publisher = {Universit{\"a}tsverlag Potsdam}, address = {Potsdam}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-68657}, pages = {13 -- 25}, year = {2013}, abstract = {1. The German banking system 1.1 Three pillar structure 1.2 Business aims 2. The German economy 2.1 A land of small and medium-sized companies 2.2 Banking system and economy fit together 3. Experience in the crisis 3.1 Customer behaviour 3.2 Risk situation 3.3 Profitability 4. Conclusion}, language = {en} } @phdthesis{Falter2016, author = {Falter, Daniela}, title = {A novel approach for large-scale flood risk assessments}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-90239}, school = {Universit{\"a}t Potsdam}, pages = {95}, year = {2016}, abstract = {In the past, floods were basically managed by flood control mechanisms. The focus was set on the reduction of flood hazard. The potential consequences were of minor interest. Nowadays river flooding is increasingly seen from the risk perspective, including possible consequences. Moreover, the large-scale picture of flood risk became increasingly important for disaster management planning, national risk developments and the (re-) insurance industry. Therefore, it is widely accepted that risk-orientated flood management ap-proaches at the basin-scale are needed. However, large-scale flood risk assessment methods for areas of several 10,000 km² are still in early stages. Traditional flood risk assessments are performed reach wise, assuming constant probabilities for the entire reach or basin. This might be helpful on a local basis, but where large-scale patterns are important this approach is of limited use. Assuming a T-year flood (e.g. 100 years) for the entire river network is unrealistic and would lead to an overestimation of flood risk at the large scale. Due to the lack of damage data, additionally, the probability of peak discharge or rainfall is usually used as proxy for damage probability to derive flood risk. With a continuous and long term simulation of the entire flood risk chain, the spatial variability of probabilities could be consider and flood risk could be directly derived from damage data in a consistent way. The objective of this study is the development and application of a full flood risk chain, appropriate for the large scale and based on long term and continuous simulation. The novel approach of 'derived flood risk based on continuous simulations' is introduced, where the synthetic discharge time series is used as input into flood impact models and flood risk is directly derived from the resulting synthetic damage time series. The bottleneck at this scale is the hydrodynamic simu-lation. To find suitable hydrodynamic approaches for the large-scale a benchmark study with simplified 2D hydrodynamic models was performed. A raster-based approach with inertia formulation and a relatively high resolution of 100 m in combination with a fast 1D channel routing model was chosen. To investigate the suitability of the continuous simulation of a full flood risk chain for the large scale, all model parts were integrated into a new framework, the Regional Flood Model (RFM). RFM consists of the hydrological model SWIM, a 1D hydrodynamic river network model, a 2D raster based inundation model and the flood loss model FELMOps+r. Subsequently, the model chain was applied to the Elbe catchment, one of the largest catchments in Germany. For the proof-of-concept, a continuous simulation was per-formed for the period of 1990-2003. Results were evaluated / validated as far as possible with available observed data in this period. Although each model part introduced its own uncertainties, results and runtime were generally found to be adequate for the purpose of continuous simulation at the large catchment scale. Finally, RFM was applied to a meso-scale catchment in the east of Germany to firstly perform a flood risk assessment with the novel approach of 'derived flood risk assessment based on continuous simulations'. Therefore, RFM was driven by long term synthetic meteorological input data generated by a weather generator. Thereby, a virtual time series of climate data of 100 x 100 years was generated and served as input to RFM providing subsequent 100 x 100 years of spatially consistent river discharge series, inundation patterns and damage values. On this basis, flood risk curves and expected annual damage could be derived directly from damage data, providing a large-scale picture of flood risk. In contrast to traditional flood risk analysis, where homogenous return periods are assumed for the entire basin, the presented approach provides a coherent large-scale picture of flood risk. The spatial variability of occurrence probability is respected. Additionally, data and methods are consistent. Catchment and floodplain processes are repre-sented in a holistic way. Antecedent catchment conditions are implicitly taken into account, as well as physical processes like storage effects, flood attenuation or channel-floodplain interactions and related damage influencing effects. Finally, the simulation of a virtual period of 100 x 100 years and consequently large data set on flood loss events enabled the calculation of flood risk directly from damage distributions. Problems associated with the transfer of probabilities in rainfall or peak runoff to probabilities in damage, as often used in traditional approaches, are bypassed. RFM and the 'derived flood risk approach based on continuous simulations' has the potential to provide flood risk statements for national planning, re-insurance aspects or other questions where spatially consistent, large-scale assessments are required.}, language = {en} } @article{Falky2022, author = {Falky, Paulina}, title = {Fach{\"u}bergreifender Musikunterricht - Terminologie und Konzepte}, series = {Perspektiven eines fach{\"u}bergreifenden Musikunterrichts (Potsdamer Schriftenreihe zur Musikp{\"a}dagogik ; 9)}, journal = {Perspektiven eines fach{\"u}bergreifenden Musikunterrichts (Potsdamer Schriftenreihe zur Musikp{\"a}dagogik ; 9)}, number = {9}, publisher = {Universit{\"a}tsverlag Potsdam}, address = {Potsdam}, isbn = {978-3-86956-535-4}, issn = {1861-8529}, doi = {10.25932/publishup-57049}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-570495}, pages = {27 -- 45}, year = {2022}, language = {de} } @article{Falkenburg2020, author = {Falkenburg, Brigitte}, title = {Hermann Cohens Bedeutung f{\"u}r die Philosophie}, series = {Schriften aus dem Nachlass von Dieter Adelmann}, volume = {2020}, journal = {Schriften aus dem Nachlass von Dieter Adelmann}, number = {4}, publisher = {Universit{\"a}tsverlag Potsdam}, address = {Potsdam}, isbn = {978-3-86956-487-6}, doi = {10.25932/publishup-47730}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-477308}, pages = {115 -- 136}, year = {2020}, language = {de} } @article{Falken2009, author = {Falken, Christiane}, title = {Demografischer Wandel und der Bereich Finanzen}, series = {KWI-Schriften}, journal = {KWI-Schriften}, number = {2}, issn = {1867-951X}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-51901}, pages = {71 -- 81}, year = {2009}, abstract = {I. Problemstellung/Ziel/Gliederung II. Demografie und Finanzen II. 1 Demografische Trends II. 2. Auswirkungen der demografischen Entwicklung}, language = {de} } @book{Falileyev2008, author = {Falileyev, Alexandre I.}, title = {Le Vieux-Gallois}, editor = {Tristram, Hildegard L. C.}, publisher = {Universit{\"a}tsverlag Potsdam}, address = {Potsdam}, isbn = {978-3-940793-44-7}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-19760}, publisher = {Universit{\"a}t Potsdam}, pages = {152}, year = {2008}, abstract = {Alexander I. Falilejevs Edition altwalisischer/altkymrischer Texte bietet eine erstmalige Zu-sammenstellung s{\"a}mtlicher erhaltener Textzeugnisse dieser inselkeltischen Sprache. Sie datieren in die Zeit vor dem Jahr 1000 n.Chr. zur{\"u}ck. Jeder Text ist mit einem Glossar und einem ausf{\"u}hrlichen linguistischen Kommentar versehen. Dieser Kommentar sowie die Einleitung liefern einen kompletten {\"U}berblick {\"u}ber den gegenw{\"a}rtigen Wissensstand auf dem Gebiet des Altwalisischen. Der systematische Teil des Buches ordnet die linguistischen Formen (Phono-logie, Morphologie, Syntax) zu einem Abriß der altwalisischen Grammatik. Yves Le Berres {\"U}bersetzung der russischen Vorlage (Древневаллийский язык (Drevnevalliskiy yazyk), Moskau 2002) ins Franz{\"o}sische erm{\"o}glicht der Forschung erstmalig einen Zugang zum Alt-walisischen in einer westeurop{\"a}ischen Sprache. Das Altwalisische ist nicht nur f{\"u}r das Verst{\"a}ndnis der anderen {\"a}lteren inselkeltischen Spra-chen wichtig (Irisch, Bretonisch und Kornisch), sondern auch f{\"u}r die Entstehungsgeschichte des Englischen. Das Altwalisische war die erste Kontaktsprache der Sprecher des sich heraus-bildenden mittelalterlichen Englischen.}, language = {fr} } @phdthesis{Falco2012, author = {Falco, Camillo}, title = {Sustainable biomass-derived hydrothermal carbons for energy applications}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-59785}, school = {Universit{\"a}t Potsdam}, year = {2012}, abstract = {The need to reduce humankind reliance on fossil fuels by exploiting sustainably the planet renewable resources is a major driving force determining the focus of modern material research. For this reason great interest is nowadays focused on finding alternatives to fossil fuels derived products/materials. For the short term the most promising substitute is undoubtedly biomass, since it is the only renewable and sustainable alternative to fossil fuels as carbon source. As a consequence efforts, aimed at finding new synthetic approaches to convert biomass and its derivatives into carbon-based materials, are constantly increasing. In this regard, hydrothermal carbonisation (HTC) has shown to be an effective means of conversion of biomass-derived precursors into functional carbon materials. However the attempts to convert raw biomass, in particular lignocellulosic one, directly into such products have certainly been rarer. Unlocking the direct use of these raw materials as carbon precursors would definitely be beneficial in terms of HTC sustainability. For this reason, in this thesis the HTC of carbohydrate and protein-rich biomass was systematically investigated, in order to obtain more insights on the potentials of this thermochemical processing technique in relation to the production of functional carbon materials from crude biomass. First a detailed investigation on the HTC conversion mechanism of lignocellulosic biomass and its single components (i.e. cellulose, lignin) was developed based on a comparison with glucose HTC, which was adopted as a reference model. In the glucose case it was demonstrated that varying the HTC temperature allowed tuning the chemical structure of the synthesised carbon materials from a highly cross-linked furan-based structure (T = 180oC) to a carbon framework composed of polyaromatic arene-like domains. When cellulose or lignocellulosic biomass was used as carbon precursor, the furan rich structure could not be isolated at any of the investigated processing conditions. These evidences were indicative of a different HTC conversion mechanism for cellulose, involving reactions that are commonly observed during pyrolytic processes. The evolution of glucose-derived HTC carbon chemical structure upon pyrolysis was also investigated. These studies revealed that upon heat treatment (Investigated temperatures 350 - 900 oC) the furan-based structure was progressively converted into highly curved aromatic pre-graphenic domains. This thermal degradation process was observed to produce an increasingly more hydrophobic surface and considerable microporosity within the HTC carbon structure. In order to introduce porosity in the HTC carbons derived from lignocellulosic biomass, KOH chemical activation was investigated as an HTC post-synthesis functionalisation step. These studies demonstrated that HTC carbons are excellent precursors for the production of highly microporous activated carbons (ACs) and that the porosity development upon KOH chemical activation is dependent on the chemical structure of the HTC carbon, tuned by employing different HTC temperatures. Preliminary testing of the ACs for CO2 capture or high pressure CH4 storage yielded very promising results, since the measured uptakes of both adsorbates (i.e. CO2 and CH4) were comparable to top-performing and commercially available adsorbents, usually employed for these end-applications. The combined use of HTC and KOH chemical activation was also employed to produce highly microporous N-doped ACs from microalgae. The hydrothermal treatment of the microalgae substrate was observed to cause the depletion of the protein and carbohydrate fractions and the near complete loss (i.e. 90\%) of the microalgae N-content, as liquid hydrolysis/degradation products. The obtained carbonaceous product showed a predominantly aliphatic character indicating the presence of alkyl chains presumably derived from the lipid fractions. Addition of glucose to the initial reaction mixture was found out to be extremely beneficial, because it allowed the fixation of a higher N amount, in the algae derived HTC carbons (i.e.  60\%), and the attainment of higher product yields (50\%). Both positive effects were attributed to Maillard type cascade reactions taking place between the monosaccharides and the microalgae derived liquid hydrolysis/degradation products, which were in this way recovered from the liquid phase. KOH chemical activation of the microalgae/glucose mixture derived HTC carbons produced highly microporous N-doped carbons. Although the activation process led to a major reduction of the N-content, the retained N-amount in the ACs was still considerable. These features render these materials ideal candidates for supercapacitors electrodes, since they provide extremely high surface areas, for the formation of electric double-layer, coupled to abundant heteroatom doping (i.e. N and O) necessary to obtain a pseudocapacitance contribution.}, language = {en} } @article{FalcetaGoncalves2015, author = {Falceta-Goncalves, D.}, title = {Magnetic fields, non-thermal radiation and particle acceleration in colliding winds of WR-O stars}, series = {Wolf-Rayet Stars : Proceedings of an International Workshop held in Potsdam, Germany, 1.-5. June 2015}, journal = {Wolf-Rayet Stars : Proceedings of an International Workshop held in Potsdam, Germany, 1.-5. June 2015}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-88211}, pages = {289 -- 292}, year = {2015}, abstract = {Non-thermal emission has been detected in WR-stars for many years at long wavelengths spectral range, in general attributed to synchrotron emission. Two key ingredients are needed to explain such emissions, namely magnetic fields and relativistic particles. Particles can be accelerated to relativistic speeds by Fermi processes at strong shocks. Therefore, strong synchrotron emission is usually attributed to WR binarity. The magnetic field may also be amplified at shocks, however the actual picture of the magnetic field geometry, intensity, and its role on the acceleration of particles at WR binary systems is still unclear. In this work we discuss the recent developments in MHD modelling of wind-wind collision regions by means of numerical simulations, and the coupled particle acceleration processes related.}, language = {en} } @article{FaixtePoelWahbeetal.2023, author = {Faix, Ann-Christin and te Poel, Kathrin and Wahbe, Nadia and Pieper, Martin}, title = {Was reflektieren wir und wie reflektieren wir?}, 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}, publisher = {Universit{\"a}tsverlag Potsdam}, address = {Potsdam}, isbn = {978-3-86956-566-8}, issn = {2626-3556}, doi = {10.25932/publishup-61899}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-618998}, pages = {47 -- 52}, year = {2023}, abstract = {In diesem Beitrag werden aus einer Metaperspektive vier verschiedene Reflexionsformate aus dem Bielefelder Projekt „BiProfessional" der Qualit{\"a}tsoffensive Lehrerbildung gegen{\"u}bergestellt. Gemeinsamkeiten und Unterschiede werden mit Blick auf das Reflexionsverst{\"a}ndnis, den Reflexionsgegenstand und den jeweiligen Zugang beschrieben. Am Ende des Beitrags werden Konsequenzen f{\"u}r eine multiparadigmatische Lehrkr{\"a}ftebildung aufgezeigt.}, language = {de} } @phdthesis{Faivre2014, author = {Faivre, Damien}, title = {Biological and biomimetic formation and organization of magnetic nanoparticles}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-72022}, school = {Universit{\"a}t Potsdam}, year = {2014}, abstract = {Biological materials have ever been used by humans because of their remarkable properties. This is surprising since the materials are formed under physiological conditions and with commonplace constituents. Nature thus not only provides us with inspiration for designing new materials but also teaches us how to use soft molecules to tune interparticle and external forces to structure and assemble simple building blocks into functional entities. Magnetotactic bacteria and their chain of magnetosomes represent a striking example of such an accomplishment where a very simple living organism controls the properties of inorganics via organics at the nanometer-scale to form a single magnetic dipole that orients the cell in the Earth magnetic field lines. My group has developed a biological and a bio-inspired research based on these bacteria. My research, at the interface between chemistry, materials science, physics, and biology focuses on how biological systems synthesize, organize and use minerals. We apply the design principles to sustainably form hierarchical materials with controlled properties that can be used e.g. as magnetically directed nanodevices towards applications in sensing, actuating, and transport. In this thesis, I thus first present how magnetotactic bacteria intracellularly form magnetosomes and assemble them in chains. I developed an assay, where cells can be switched from magnetic to non-magnetic states. This enabled to study the dynamics of magnetosome and magnetosome chain formation. We found that the magnetosomes nucleate within minutes whereas chains assembles within hours. Magnetosome formation necessitates iron uptake as ferrous or ferric ions. The transport of the ions within the cell leads to the formation of a ferritin-like intermediate, which subsequently is transported and transformed within the magnetosome organelle in a ferrihydrite-like precursor. Finally, magnetite crystals nucleate and grow toward their mature dimension. In addition, I show that the magnetosome assembly displays hierarchically ordered nano- and microstructures over several levels, enabling the coordinated alignment and motility of entire populations of cells. The magnetosomes are indeed composed of structurally pure magnetite. The organelles are partly composed of proteins, which role is crucial for the properties of the magnetosomes. As an example, we showed how the protein MmsF is involved in the control of magnetosome size and morphology. We have further shown by 2D X-ray diffraction that the magnetosome particles are aligned along the same direction in the magnetosome chain. We then show how magnetic properties of the nascent magnetosome influence the alignment of the particles, and how the proteins MamJ and MamK coordinate this assembly. We propose a theoretical approach, which suggests that biological forces are more important than physical ones for the chain formation. All these studies thus show how magnetosome formation and organization are under strict biological control, which is associated with unprecedented material properties. Finally, we show that the magnetosome chain enables the cells to find their preferred oxygen conditions if the magnetic field is present. The synthetic part of this work shows how the understanding of the design principles of magnetosome formation enabled me to perform biomimetic synthesis of magnetite particles within the highly desired size range of 25 to 100 nm. Nucleation and growth of such particles are based on aggregation of iron colloids termed primary particles as imaged by cryo-high resolution TEM. I show how additives influence magnetite formation and properties. In particular, MamP, a so-called magnetochrome proteins involved in the magnetosome formation in vivo, enables the in vitro formation of magnetite nanoparticles exclusively from ferrous iron by controlling the redox state of the process. Negatively charged additives, such as MamJ, retard magnetite nucleation in vitro, probably by interacting with the iron ions. Other additives such as e.g. polyarginine can be used to control the colloidal stability of stable-single domain sized nanoparticles. Finally, I show how we can "glue" magnetic nanoparticles to form propellers that can be actuated and swim with the help of external magnetic fields. We propose a simple theory to explain the observed movement. We can use the theoretical framework to design experimental conditions to sort out the propellers depending on their size and effectively confirm this prediction experimentally. Thereby, we could image propellers with size down to 290 nm in their longer dimension, much smaller than what perform so far.}, language = {en} } @misc{FaireyTimmermanSudoetal.2019, author = {Fairey, Brenton J. and Timmerman, Martin Jan and Sudo, Masafumi and Tsikos, Harilaos}, title = {The role of hydrothermal activity in the formation of Karst-hosted manganese deposits of the Postmasburg Mn Field, Northern Cape Province, South Africa}, series = {Postprints der Universit{\"a}t Potsdam : Mathematisch-Naturwissenschaftliche Reihe}, journal = {Postprints der Universit{\"a}t Potsdam : Mathematisch-Naturwissenschaftliche Reihe}, number = {966}, issn = {1866-8372}, doi = {10.25932/publishup-47330}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-473304}, pages = {30}, year = {2019}, abstract = {The Postmasburg Manganese Field (PMF), Northern Cape Province, South Africa, once represented one of the largest sources of manganese ore worldwide. Two belts of manganese ore deposits have been distinguished in the PMF, namely the Western Belt of ferruginous manganese ores and the Eastern Belt of siliceous manganese ores. Prevailing models of ore formation in these two belts invoke karstification of manganese-rich dolomites and residual accumulation of manganese wad which later underwent diagenetic and low-grade metamorphic processes. For the most part, the role of hydrothermal processes and metasomatic alteration towards ore formation has not been adequately discussed. Here we report an abundance of common and some rare Al-, Na-, K- and Ba-bearing minerals, particularly aegirine, albite, microcline, banalsite, s{\´e}randite-pectolite, paragonite and natrolite in Mn ores of the PMF, indicative of hydrothermal influence. Enrichments in Na, K and/or Ba in the ores are generally on a percentage level for most samples analysed through bulk-rock techniques. The presence of As-rich tokyoite also suggests the presence of As and V in the hydrothermal fluid. The fluid was likely oxidized and alkaline in nature, akin to a mature basinal brine. Various replacement textures, particularly of Na- and K- rich minerals by Ba-bearing phases, suggest sequential deposition of gangue as well as ore-minerals from the hydrothermal fluid, with Ba phases being deposited at a later stage. The stratigraphic variability of the studied ores and their deviation from the strict classification of ferruginous and siliceous ores in the literature, suggests that a re-evaluation of genetic models is warranted. New Ar-Ar ages for K-feldspars suggest a late Neoproterozoic timing for hydrothermal activity. This corroborates previous geochronological evidence for regional hydrothermal activity that affected Mn ores at the PMF but also, possibly, the high-grade Mn ores of the Kalahari Manganese Field to the north. A revised, all-encompassing model for the development of the manganese deposits of the PMF is then proposed, whereby the source of metals is attributed to underlying carbonate rocks beyond the Reivilo Formation of the Campbellrand Subgroup. The main process by which metals are primarily accumulated is attributed to karstification of the dolomitic substrate. The overlying Asbestos Hills Subgroup banded iron formation (BIF) is suggested as a potential source of alkali metals, which also provides a mechanism for leaching of these BIFs to form high-grade residual iron ore deposits.}, language = {en} } @article{Faierstein2019, author = {Faierstein, Morris M.}, title = {The Melits Yosher and the Audience for Early Modern Yiddish Literature}, series = {PaRDeS: Zeitschrift der Vereinigung f{\"u}r J{\"u}dische Studien = Transformative Translations in Jewish History and Culture}, volume = {2019}, journal = {PaRDeS: Zeitschrift der Vereinigung f{\"u}r J{\"u}dische Studien = Transformative Translations in Jewish History and Culture}, number = {25}, publisher = {Universit{\"a}tsverlag Potsdam}, address = {Potsdam}, isbn = {978-3-86956-468-5}, issn = {1614-6492}, doi = {10.25932/publishup-44590}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-445900}, pages = {23 -- 42}, year = {2019}, abstract = {Rabbi Jacob ben Isaac of Yanova (d. 1623) is best known as the author of the Ze'enah U-Re'enah; the Melits Yosher ("Intercessor before God") is one of his lesser known works. It was first published in Lublin in 1622 and reprinted once in Amsterdam in 1688. Like the Ze'enah U-Re'enah, it was a Torah commentary, but composed for men who had some yeshivah education, but who could not continue their studies. The commentary on the Song of Songs by Isaac Sulkes is another Yiddish work that addresses the same audience as the Melits Yosher. The purpose of this article is to bring to scholarly attention an audience that has not been noticed or studied in the previous scholarship on early modern Yiddish literature.}, language = {en} } @article{Fadeev2013, author = {Fadeev, Vladimir Ivanovič}, title = {Haben die Kirchen und Religionsgemeinschaften eine „politische Mission" oder nur einen {\"O}ffentlichkeitsauftrag?}, series = {Zweite Woche des Russischen Rechts, Potsdam, 14.-18.05.2012}, journal = {Zweite Woche des Russischen Rechts, Potsdam, 14.-18.05.2012}, publisher = {Universit{\"a}tsverlag Potsdam}, address = {Potsdam}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-66524}, pages = {121 -- 125}, year = {2013}, language = {de} } @article{Fadeev2014, author = {Fadeev, Vladimir Ivanovič}, title = {Fortentwicklung der Verfassung der Russischen F{\"o}deration durch das Verfassungsgericht}, series = {Verfassungsentwicklung in Russland und Deutschland : Materialien des russisch-deutschen Symposiums anl{\"a}sslich des 20. Jahrestages der Verfassung der Russischen F{\"o}deration am 25. und 26. September 2013 an der Universit{\"a}t Potsdam}, journal = {Verfassungsentwicklung in Russland und Deutschland : Materialien des russisch-deutschen Symposiums anl{\"a}sslich des 20. Jahrestages der Verfassung der Russischen F{\"o}deration am 25. und 26. September 2013 an der Universit{\"a}t Potsdam}, publisher = {Universit{\"a}tsverlag Potsdam}, address = {Potsdam}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-70927}, pages = {77 -- 87}, year = {2014}, language = {de} } @article{Fadeev2013, author = {Fadeev, Vladimir Ivanovič}, title = {Ist die Einwohnerschaft einer Gemeinde eine freiwillige B{\"u}rgervereinigung?}, series = {Verfassungsgerichtsbarkeit in der Russischen F{\"o}deration und in der Bundesrepublik Deutschland : Rundtischgespr{\"a}ch an der Moskauer Staatlichen Juristischen Kutafin-Universit{\"a}t am 9. und 10. Oktober 2012}, journal = {Verfassungsgerichtsbarkeit in der Russischen F{\"o}deration und in der Bundesrepublik Deutschland : Rundtischgespr{\"a}ch an der Moskauer Staatlichen Juristischen Kutafin-Universit{\"a}t am 9. und 10. Oktober 2012}, publisher = {Universit{\"a}tsverlag Potsdam}, address = {Potsdam}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-68352}, pages = {129 -- 135}, year = {2013}, language = {de} } @misc{Fabjancic2005, author = {Fabjancic, Martin}, title = {Horst Herrmann: Die Folter, Eine Enzyklop{\"a}die des Grauens / [rezensiert von] Martin Fabjancic}, series = {MenschenRechtsMagazin : MRM ; Informationen, Meinungen, Analysen}, volume = {10}, journal = {MenschenRechtsMagazin : MRM ; Informationen, Meinungen, Analysen}, number = {1}, issn = {1434-2820}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-56060}, pages = {100 -- 101}, year = {2005}, abstract = {rezensiertes Werk: Herrmann, Horst: Die Folter, Eine Enzyklop{\"a}die des Grauens. - Frankft/Main : Eichborn, 2004. - 384 S. ISBN 3-8218-3951-1}, language = {de} } @article{Fabian2012, author = {Fabian, Steffi}, title = {Dis waren verfluchte Diebes H{\"a}nde}, series = {Milit{\"a}r und Gesellschaft in der fr{\"u}hen Neuzeit}, volume = {16}, journal = {Milit{\"a}r und Gesellschaft in der fr{\"u}hen Neuzeit}, number = {2}, publisher = {Universit{\"a}tsverlag Potsdam}, address = {Potsdam}, issn = {1617-9722}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-63737}, pages = {169 -- 196}, year = {2012}, abstract = {I. Einleitung II. Vom bluth vergießen und Landtverderben III. Wo der soldat hink{\"o}mbt, da ist alles sein - Konfliktfelder und Wahrnehmungsdivergenzen IV. Zusammenfassung und Ausblick}, language = {de} }