@techreport{LessmannGrunerKalkuhletal.2024, type = {Working Paper}, author = {Lessmann, Kai and Gruner, Friedemann and Kalkuhl, Matthias and Edenhofer, Ottmar}, title = {Emissions Trading with Clean-up Certificates}, series = {CEPA Discussion Papers}, journal = {CEPA Discussion Papers}, number = {79}, issn = {2628-653X}, doi = {10.25932/publishup-64136}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-641368}, pages = {35}, year = {2024}, abstract = {We analyze how conventional emissions trading schemes (ETS) can be modified by introducing "clean-up certificates" to allow for a phase of net-negative emissions. Clean-up certificates bundle the permission to emit CO2 with the obligation for its removal. We show that demand for such certificates is determined by cost-saving technological progress, the discount rate and the length of the compliance period. Introducing extra clean-up certificates into an existing ETS reduces near-term carbon prices and mitigation efforts. In contrast, substituting ETS allowances with clean-up certificates reduces cumulative emissions without depressing carbon prices or mitigation in the near term. We calibrate our model to the EU ETS and identify reforms where simultaneously (i) ambition levels rise, (ii) climate damages fall, (iii) revenues from carbon prices rise and (iv) carbon prices and aggregate mitigation cost fall. For reducing climate damages, roughly half of the issued clean-up certificates should replace conventional ETS allowances. In the context of the EU ETS, a European Carbon Central Bank could manage the implementation of cleanup certificates and could serve as an enforcement mechanism.}, language = {en} } @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{WaswaAbengaIndede2020, author = {Waswa, Fuchaka and Abenga, Elizabeth and Indede, Florence}, title = {Enhancing Completion Rates through Structural and Operational Changes in the Management of Postgraduate Programmes in Kenya's Public Universities}, series = {Potsdamer Beitr{\"a}ge zur Hochschulforschung}, journal = {Potsdamer Beitr{\"a}ge zur Hochschulforschung}, number = {5}, publisher = {Universit{\"a}tsverlag Potsdam}, address = {Potsdam}, isbn = {978-3-86956-496-8}, issn = {2192-1075}, doi = {10.25932/publishup-49346}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-493468}, pages = {85 -- 101}, year = {2020}, abstract = {During the National Multiplication Training in Kenya in 2018, participants raised concerns about attrition, completion rates and quality of PhD programmes in Kenya's public universities. This led the authors of this article to further examine the question of PhD completion rates. Available data underlined that PhD students across various disciplines in Kenya's public universities take unnecessarily long to complete their studies due to a myriad of factors that are related to their supervisors, university guidelines for post-graduate studies, or the students themselves. This article examines inertia areas along the PhD training pathway at three public universities in Kenya and provides suggestions on structural and operational changes universities must make to shorten completion periods.}, language = {en} } @article{EcheverriaKingAcunaPaezCoronadoVargas2020, author = {Echeverr{\´i}a King, Luisa Fernanda and Acu{\~n}a Paez, Katherine and Coronado Vargas, Carlos}, title = {Enhancing Internationalisation for Peacebuilding among Higher Education Institutions in Post-Conflict Colombia}, series = {Potsdamer Beitr{\"a}ge zur Hochschulforschung}, journal = {Potsdamer Beitr{\"a}ge zur Hochschulforschung}, number = {5}, publisher = {Universit{\"a}tsverlag Potsdam}, address = {Potsdam}, isbn = {978-3-86956-496-8}, issn = {2192-1075}, doi = {10.25932/publishup-49350}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-493500}, pages = {103 -- 121}, year = {2020}, abstract = {This article collected the results of a qualitative study focused on Colombian Higher Education Institutions' representatives partaking in the training 'Internationalisation for Peacebuilding 2018'. The selected Higher Education Institutions and representatives were all located in regions acutely affected by the Colombian armed conflict, now experiencing multifaceted challenges and opportunities in a post-conflict scenario. Interviews with participants of the training were conducted to analyse the skills acquired and to identify possible improvements brought about by the training at the institutions. The article further identifies specific needs of the institutions, to be taken into account for future courses on internationalisation for higher education institutions.}, language = {en} } @article{GujberovaTomcsanyi2013, author = {Gujberov{\´a}, Monika and Tomcs{\´a}nyi, Peter}, title = {Environments for programming in primary education}, series = {Commentarii informaticae didacticae : (CID)}, journal = {Commentarii informaticae didacticae : (CID)}, number = {6}, publisher = {Universit{\"a}tsverlag Potsdam}, address = {Potsdam}, issn = {1868-0844}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-64499}, pages = {53 -- 60}, year = {2013}, abstract = {The aim of our article is to collect and present information about contemporary programming environments that are suitable for primary education. We studied the ways they implement (or do not implement) some programming concepts, the ways programs are represented and built in order to support young and novice programmers, as well as their suitability to allow different forms of sharing the results of pupils' work. We present not only a short description of each considered environment and the taxonomy in the form of a table, but also our understanding and opinions on how and why the environments implement the same concepts and ideas in different ways and which concepts and ideas seem to be important to the creators of such environments.}, language = {en} } @inproceedings{Gull2007, author = {Gull, T. R.}, title = {Eta Carinae viewed from different vantages}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-18200}, year = {2007}, abstract = {The spatially-resolved winds of the massive binary, Eta Carinae, extend an arcsecond on the sky, well beyond the 10 to 20 milliarcsecond binary orbital dimension. Stellar wind line profiles, observed at very different angular resolutions of VLTI/AMBER, HST/STIS and VLT/UVES, provide spatial information on the extended wind interaction structure as it changes with orbital phase. These same wind lines, observable in the starlight scattered off the foreground lobe of the dusty Homunculus, provide time-variant line profiles viewed from significantly different angles. Comparisons of direct and scattered wind profiles observed in the same epoch and at different orbital phases provide insight on the extended wind structure and promise the potential for three-dimensional imaging of the outer wind structures. Massive, long-lasting clumps, including the nebularWeigelt blobs, originated during the two historical ejection events. Wind interactions with these clumps are quite noticeable in spatially-resolved spectroscopy. As the 2009.0 minimum approaches, analysis of existing spectra and 3-D modeling are providing bases for key observations to gain further understanding of this complex massive binary.}, language = {en} } @phdthesis{Neuharth2022, author = {Neuharth, Derek}, title = {Evolution of divergent and strike-slip boundaries in response to surface processes}, doi = {10.25932/publishup-54940}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-549403}, school = {Universit{\"a}t Potsdam}, pages = {xiii, 108}, year = {2022}, abstract = {Plate tectonics describes the movement of rigid plates at the surface of the Earth as well as their complex deformation at three types of plate boundaries: 1) divergent boundaries such as rift zones and mid-ocean ridges, 2) strike-slip boundaries where plates grind past each other, such as the San Andreas Fault, and 3) convergent boundaries that form large mountain ranges like the Andes. The generally narrow deformation zones that bound the plates exhibit complex strain patterns that evolve through time. During this evolution, plate boundary deformation is driven by tectonic forces arising from Earth's deep interior and from within the lithosphere, but also by surface processes, which erode topographic highs and deposit the resulting sediment into regions of low elevation. Through the combination of these factors, the surface of the Earth evolves in a highly dynamic way with several feedback mechanisms. At divergent boundaries, for example, tensional stresses thin the lithosphere, forcing uplift and subsequent erosion of rift flanks, which creates a sediment source. Meanwhile, the rift center subsides and becomes a topographic low where sediments accumulate. This mass transfer from foot- to hanging wall plays an important role during rifting, as it prolongs the activity of individual normal faults. When rifting continues, continents are eventually split apart, exhuming Earth's mantle and creating new oceanic crust. Because of the complex interplay between deep tectonic forces that shape plate boundaries and mass redistribution at the Earth's surface, it is vital to understand feedbacks between the two domains and how they shape our planet. In this study I aim to provide insight on two primary questions: 1) How do divergent and strike-slip plate boundaries evolve? 2) How is this evolution, on a large temporal scale and a smaller structural scale, affected by the alteration of the surface through erosion and deposition? This is done in three chapters that examine the evolution of divergent and strike-slip plate boundaries using numerical models. Chapter 2 takes a detailed look at the evolution of rift systems using two-dimensional models. Specifically, I extract faults from a range of rift models and correlate them through time to examine how fault networks evolve in space and time. By implementing a two-way coupling between the geodynamic code ASPECT and landscape evolution code FastScape, I investigate how the fault network and rift evolution are influenced by the system's erosional efficiency, which represents many factors like lithology or climate. In Chapter 3, I examine rift evolution from a three-dimensional perspective. In this chapter I study linkage modes for offset rifts to determine when fast-rotating plate-boundary structures known as continental microplates form. Chapter 4 uses the two-way numerical coupling between tectonics and landscape evolution to investigate how a strike-slip boundary responds to large sediment loads, and whether this is sufficient to form an entirely new type of flexural strike-slip basin.}, language = {en} } @phdthesis{Schuette2011, author = {Sch{\"u}tte, Moritz}, title = {Evolutionary fingerprints in genome-scale networks}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-57483}, school = {Universit{\"a}t Potsdam}, year = {2011}, abstract = {Mathematical modeling of biological phenomena has experienced increasing interest since new high-throughput technologies give access to growing amounts of molecular data. These modeling approaches are especially able to test hypotheses which are not yet experimentally accessible or guide an experimental setup. One particular attempt investigates the evolutionary dynamics responsible for today's composition of organisms. Computer simulations either propose an evolutionary mechanism and thus reproduce a recent finding or rebuild an evolutionary process in order to learn about its mechanism. The quest for evolutionary fingerprints in metabolic and gene-coexpression networks is the central topic of this cumulative thesis based on four published articles. An understanding of the actual origin of life will probably remain an insoluble problem. However, one can argue that after a first simple metabolism has evolved, the further evolution of metabolism occurred in parallel with the evolution of the sequences of the catalyzing enzymes. Indications of such a coevolution can be found when correlating the change in sequence between two enzymes with their distance on the metabolic network which is obtained from the KEGG database. We observe that there exists a small but significant correlation primarily on nearest neighbors. This indicates that enzymes catalyzing subsequent reactions tend to be descended from the same precursor. Since this correlation is relatively small one can at least assume that, if new enzymes are no "genetic children" of the previous enzymes, they certainly be descended from any of the already existing ones. Following this hypothesis, we introduce a model of enzyme-pathway coevolution. By iteratively adding enzymes, this model explores the metabolic network in a manner similar to diffusion. With implementation of an Gillespie-like algorithm we are able to introduce a tunable parameter that controls the weight of sequence similarity when choosing a new enzyme. Furthermore, this method also defines a time difference between successive evolutionary innovations in terms of a new enzyme. Overall, these simulations generate putative time-courses of the evolutionary walk on the metabolic network. By a time-series analysis, we find that the acquisition of new enzymes appears in bursts which are pronounced when the influence of the sequence similarity is higher. This behavior strongly resembles punctuated equilibrium which denotes the observation that new species tend to appear in bursts as well rather than in a gradual manner. Thus, our model helps to establish a better understanding of punctuated equilibrium giving a potential description at molecular level. From the time-courses we also extract a tentative order of new enzymes, metabolites, and even organisms. The consistence of this order with previous findings provides evidence for the validity of our approach. While the sequence of a gene is actually subject to mutations, its expression profile might also indirectly change through the evolutionary events in the cellular interplay. Gene coexpression data is simply accessible by microarray experiments and commonly illustrated using coexpression networks where genes are nodes and get linked once they show a significant coexpression. Since the large number of genes makes an illustration of the entire coexpression network difficult, clustering helps to show the network on a metalevel. Various clustering techniques already exist. However, we introduce a novel one which maintains control of the cluster sizes and thus assures proper visual inspection. An application of the method on Arabidopsis thaliana reveals that genes causing a severe phenotype often show a functional uniqueness in their network vicinity. This leads to 20 genes of so far unknown phenotype which are however suggested to be essential for plant growth. Of these, six indeed provoke such a severe phenotype, shown by mutant analysis. By an inspection of the degree distribution of the A.thaliana coexpression network, we identified two characteristics. The distribution deviates from the frequently observed power-law by a sharp truncation which follows after an over-representation of highly connected nodes. For a better understanding, we developed an evolutionary model which mimics the growth of a coexpression network by gene duplication which underlies a strong selection criterion, and slight mutational changes in the expression profile. Despite the simplicity of our assumption, we can reproduce the observed properties in A.thaliana as well as in E.coli and S.cerevisiae. The over-representation of high-degree nodes could be identified with mutually well connected genes of similar functional families: zinc fingers (PF00096), flagella, and ribosomes respectively. In conclusion, these four manuscripts demonstrate the usefulness of mathematical models and statistical tools as a source of new biological insight. While the clustering approach of gene coexpression data leads to the phenotypic characterization of so far unknown genes and thus supports genome annotation, our model approaches offer explanations for observed properties of the coexpression network and furthermore substantiate punctuated equilibrium as an evolutionary process by a deeper understanding of an underlying molecular mechanism.}, language = {en} } @inproceedings{Cabalar2010, author = {Cabalar, Pedro}, title = {Existential quantifiers in the rule body}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-41476}, year = {2010}, abstract = {In this paper we consider a simple syntactic extension of Answer Set Programming (ASP) for dealing with (nested) existential quantifiers and double negation in the rule bodies, in a close way to the recent proposal RASPL-1. The semantics for this extension just resorts to Equilibrium Logic (or, equivalently, to the General Theory of Stable Models), which provides a logic-programming interpretation for any arbitrary theory in the syntax of Predicate Calculus. We present a translation of this syntactic class into standard logic programs with variables (either disjunctive or normal, depending on the input rule heads), as those allowed by current ASP solvers. The translation relies on the introduction of auxiliary predicates and the main result shows that it preserves strong equivalence modulo the original signature.}, language = {en} } @phdthesis{Boerner2009, author = {B{\"o}rner, Hans Gerhard}, title = {Exploiting self-organization and functionality of peptides for polymer science}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-29066}, school = {Universit{\"a}t Potsdam}, year = {2009}, abstract = {Controlling interactions in synthetic polymers as precisely as in proteins would have a strong impact on polymer science. Advanced structural and functional control can lead to rational design of, integrated nano- and microstructures. To achieve this, properties of monomer sequence defined oligopeptides were exploited. Through their incorporation as monodisperse segments into synthetic polymers we learned in recent four years how to program the structure formation of polymers, to adjust and exploit interactions in such polymers, to control inorganic-organic interfaces in fiber composites and induce structure in Biomacromolecules like DNA for biomedical applications.}, language = {en} } @article{TeichFankhauser2005, author = {Teich, Elke and Fankhauser, Peter}, title = {Exploring lexical patterns in text}, series = {Interdisciplinary studies on information structure : ISIS ; working papers of the SFB 632}, journal = {Interdisciplinary studies on information structure : ISIS ; working papers of the SFB 632}, number = {2}, issn = {1866-4725}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-8685}, pages = {129 -- 145}, year = {2005}, abstract = {We present a system for the linguistic exploration and analysis of lexical cohesion in English texts. Using an electronic thesaurus-like resource, Princeton WordNet, and the Brown Corpus of English, we have implemented a process of annotating text with lexical chains and a graphical user interface for inspection of the annotated text. We describe the system and report on some sample linguistic analyses carried out using the combined thesaurus-corpus resource.}, language = {en} } @phdthesis{Stettner2018, author = {Stettner, Samuel}, title = {Exploring the seasonality of rapid Arctic changes from space}, doi = {10.25932/publishup-42578}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-425783}, school = {Universit{\"a}t Potsdam}, pages = {XIII, 132}, year = {2018}, abstract = {Arctic warming has implications for the functioning of terrestrial Arctic ecosystems, global climate and socioeconomic systems of northern communities. A research gap exists in high spatial resolution monitoring and understanding of the seasonality of permafrost degradation, spring snowmelt and vegetation phenology. This thesis explores the diversity and utility of dense TerraSAR-X (TSX) X-Band time series for monitoring ice-rich riverbank erosion, snowmelt, and phenology of Arctic vegetation at long-term study sites in the central Lena Delta, Russia and on Qikiqtaruk (Herschel Island), Canada. In the thesis the following three research questions are addressed: • Is TSX time series capable of monitoring the dynamics of rapid permafrost degradation in ice-rich permafrost on an intra-seasonal scale and can these datasets in combination with climate data identify the climatic drivers of permafrost degradation? • Can multi-pass and multi-polarized TSX time series adequately monitor seasonal snow cover and snowmelt in small Arctic catchments and how does it perform compared to optical satellite data and field-based measurements? • Do TSX time series reflect the phenology of Arctic vegetation and how does the recorded signal compare to in-situ greenness data from RGB time-lapse camera data and vegetation height from field surveys? To answer the research questions three years of TSX backscatter data from 2013 to 2015 for the Lena Delta study site and from 2015 to 2017 for the Qikiqtaruk study site were used in quantitative and qualitative analysis complimentary with optical satellite data and in-situ time-lapse imagery. The dynamics of intra-seasonal ice-rich riverbank erosion in the central Lena Delta, Russia were quantified using TSX backscatter data at 2.4 m spatial resolution in HH polarization and validated with 0.5 m spatial resolution optical satellite data and field-based time-lapse camera data. Cliff top lines were automatically extracted from TSX intensity images using threshold-based segmentation and vectorization and combined in a geoinformation system with manually digitized cliff top lines from the optical satellite data and rates of erosion extracted from time-lapse cameras. The results suggest that the cliff top eroded at a constant rate throughout the entire erosional season. Linear mixed models confirmed that erosion was coupled with air temperature and precipitation at an annual scale, seasonal fluctuations did not influence 22-day erosion rates. The results highlight the potential of HH polarized X-Band backscatter data for high temporal resolution monitoring of rapid permafrost degradation. The distinct signature of wet snow in backscatter intensity images of TSX data was exploited to generate wet snow cover extent (SCE) maps on Qikiqtaruk at high temporal resolution. TSX SCE showed high similarity to Landsat 8-derived SCE when using cross-polarized VH data. Fractional snow cover (FSC) time series were extracted from TSX and optical SCE and compared to FSC estimations from in-situ time-lapse imagery. The TSX products showed strong agreement with the in-situ data and significantly improved the temporal resolution compared to the Landsat 8 time series. The final combined FSC time series revealed two topography-dependent snowmelt patterns that corresponded to in-situ measurements. Additionally TSX was able to detect snow patches longer in the season than Landsat 8, underlining the advantage of TSX for detection of old snow. The TSX-derived snow information provided valuable insights into snowmelt dynamics on Qikiqtaruk previously not available. The sensitivity of TSX to vegetation structure associated with phenological changes was explored on Qikiqtaruk. Backscatter and coherence time series were compared to greenness data extracted from in-situ digital time-lapse cameras and detailed vegetation parameters on 30 areas of interest. Supporting previous results, vegetation height corresponded to backscatter intensity in co-polarized HH/VV at an incidence angle of 31°. The dry, tall shrub dominated ecological class showed increasing backscatter with increasing greenness when using the cross polarized VH/HH channel at 32° incidence angle. This is likely driven by volume scattering of emerging and expanding leaves. Ecological classes with more prostrate vegetation and higher bare ground contributions showed decreasing backscatter trends over the growing season in the co-polarized VV/HH channels likely a result of surface drying instead of a vegetation structure signal. The results from shrub dominated areas are promising and provide a complementary data source for high temporal monitoring of vegetation phenology. Overall this thesis demonstrates that dense time series of TSX with optical remote sensing and in-situ time-lapse data are complementary and can be used to monitor rapid and seasonal processes in Arctic landscapes at high spatial and temporal resolution.}, language = {en} } @inproceedings{Piskorski2008, author = {Piskorski, Jakub}, title = {ExPRESS : extraction pattern recognition engine and specification suite}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-27227}, year = {2008}, abstract = {The emergence of information extraction (IE) oriented pattern engines has been observed during the last decade. Most of them exploit heavily finite-state devices. This paper introduces ExPRESS - a new extraction pattern engine, whose rules are regular expressions over flat feature structures. The underlying pattern language is a blend of two previously introduced IE oriented pattern formalisms, namely, JAPE, used in the widely known GATE system, and the unificationbased XTDL formalism used in SProUT. A brief and technical overview of ExPRESS, its pattern language and the pool of its native linguistic components is given. Furthermore, the implementation of the grammar interpreter is addressed too.}, language = {en} } @book{PapeTrefferHirschfeldetal.2013, author = {Pape, Tobias and Treffer, Arian and Hirschfeld, Robert and Haupt, Michael}, title = {Extending a Java Virtual Machine to Dynamic Object-oriented Languages}, publisher = {Universit{\"a}tsverlag Potsdam}, address = {Potsdam}, isbn = {978-3-86956-266-7}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-67438}, publisher = {Universit{\"a}t Potsdam}, pages = {163}, year = {2013}, abstract = {There are two common approaches to implement a virtual machine (VM) for a dynamic object-oriented language. On the one hand, it can be implemented in a C-like language for best performance and maximum control over the resulting executable. On the other hand, it can be implemented in a language such as Java that allows for higher-level abstractions. These abstractions, such as proper object-oriented modularization, automatic memory management, or interfaces, are missing in C-like languages but they can simplify the implementation of prevalent but complex concepts in VMs, such as garbage collectors (GCs) or just-in-time compilers (JITs). Yet, the implementation of a dynamic object-oriented language in Java eventually results in two VMs on top of each other (double stack), which impedes performance. For statically typed languages, the Maxine VM solves this problem; it is written in Java but can be executed without a Java virtual machine (JVM). However, it is currently not possible to execute dynamic object-oriented languages in Maxine. This work presents an approach to bringing object models and execution models of dynamic object-oriented languages to the Maxine VM and the application of this approach to Squeak/Smalltalk. The representation of objects in and the execution of dynamic object-oriented languages pose certain challenges to the Maxine VM that lacks certain variation points necessary to enable an effortless and straightforward implementation of dynamic object-oriented languages' execution models. The implementation of Squeak/Smalltalk in Maxine as a feasibility study is to unveil such missing variation points.}, language = {en} } @article{Kainz2023, author = {Kainz, Fritz}, title = {Extraterritorial Constitutional Rights}, series = {MenschenRechtsMagazin}, volume = {28}, journal = {MenschenRechtsMagazin}, number = {2}, publisher = {Universit{\"a}tsverlag Potsdam}, address = {Potsdam}, issn = {2941-1149}, doi = {10.25932/publishup-60996}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-609962}, pages = {140 -- 150}, year = {2023}, abstract = {Im Laufe der vergangenen Jahrzehnte widmeten Lehre und Rechtsprechung der extraterritorialen Anwendbarkeit von Menschenrechtsabkommen erhebliche Aufmerksamkeit. Im Gegensatz fand die extraterritoriale Anwendung verfassungsgesetzlich verankerter Grundrechte nur in den Vereinigten Staaten vergleichbares akademisches Interesse. Insbesondere l{\"a}sst sich ein Mangel an vergleichender Forschung in diesem Bereich feststellen, was zur herrschenden Meinung beitr{\"a}gt, dass internationale Menschenrechtskonventionen den geeigneten Rahmen bieten, unter dem inl{\"a}ndische Gerichte extraterritoriale Fragen des Verfassungsrechts pr{\"u}fen sollten. Dieser Artikel argumentiert, dass inl{\"a}ndische verfassungsrechtliche Regelungen und die zu ihrer Durchsetzung zust{\"a}ndigen Gerichte ein wichtiges Gegengewicht in der festgefahrenen internationalen Extraterritorialit{\"a}tsdebatte spielen sollten. Anhand zweier Fallstudien aus Deutschland und den Vereinigten Staaten wird gezeigt, dass inl{\"a}ndische Verfassungsgerichte manchmal besser geeignet sind als Vertragsorgane, um die Grundwerte der Menschenw{\"u}rde und der Universalit{\"a}t im extraterritorialen Kontext zu wahren. Dies zeigt sich besonders deutlich am Beispiel Deutschlands, das {\"u}ber eine lange Tradition der Integration in internationale Mehrebenensysteme und des grundrechtliche "Bottom-up"-Widerstands innerhalb solcher Systeme verf{\"u}gt. Aktuelle F{\"a}lle des Bundesverfassungsgerichts zur extraterritorialen Anwendung des Grundgesetzes auf ausl{\"a}ndische nachrichtendienstliche Aktivit{\"a}ten und Klimawandel unterst{\"u}tzen diese Theorie. Allerdings kann ein unabh{\"a}ngiger verfassungsrechtlicher Ansatz auch in solchen nationalen Systemen eigenst{\"a}ndige normative Effekte erzielen, welche st{\"a}rker vom internationalen Menschenrechtssystem isoliert sind. So verwendete auch der amerikanische Oberste Gerichtshof (Supreme Court) die inl{\"a}ndische verfassungsrechtliche Doktrin, um die streng territoriale Auslegung des Internationalen Pakts {\"u}ber b{\"u}rgerliche und politische Rechte durch die amerikanische Regierung zu umgehen und einen funktionalen Ansatz f{\"u}r die extraterritoriale Anwendbarkeit von Grundrechten im Fall der Inhaftierung mutmaßlicher Terroristen im Marinest{\"u}tzpunkt von Guant{\´a}namo Bay zu nutzen. Die Untersuchung dieser Beispiele beansprucht nicht, umfassend oder repr{\"a}sentativ die vielf{\"a}ltigen Verfassungen der Welt und ihre Beziehungen zu v{\"o}lkerrechtlichen Menschenrechtsnormen zu untersuchen. Dennoch sollte die unabh{\"a}ngige Wirkung von verfassungsrechtlichen Rahmenbedingungen in diesen beiden disparaten F{\"a}llen umso mehr Anreiz f{\"u}r eine verst{\"a}rkte vergleichende Forschung zu verfassungsrechtlichen Extraterritorialit{\"a}tsregimen und ihrem Beitrag zum Projekt der Menschenrechte bieten.}, language = {en} } @inproceedings{IpingSonnebornMassaetal.2007, author = {Iping, R.C. and Sonneborn, G. and Massa, D.L. and Gies, D. and Williams, Simon E.}, title = {Far-ultraviolet spectroscopy of O+O binaries in the Magellanic Clouds}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-17896}, year = {2007}, abstract = {We report FUSE observations in 2005-2006 of three O-type, double-lined spectroscopic binaries in the Magellanic Clouds. The systems have very short periods (1.4-2.25 d), represent rare, young evolutionary stages of massive stars and binaries, and provide a unique glimpse at some of the most massive systems that form in dense clusters of massive stars. Improved orbit parameters, including revised masses, for LH54-425 are derived from new ctio spectroscopy. The systems are: LH54-425 in the LMC (O3V + O5V, P=2.25d, 62+37M⊙), J053441-693139 in the LMC (O2-3If+O6V, P=1.4 d, 41+27M⊙), and Hodge 53-47 in the SMC (O6V + O4-5IIIf, P=2.2 d, 24+14M⊙, where the O4 star appears to be less massive than the O6 star). Their short periods indicates that wind interaction and mass transfer are likely important factors in their evolution. The spectra provide quantitative and systematic studies of phase-dependent stellar wind properties, wind collision effects in O+O binaries at lower metallicities, improved radial velocity curves, and FUV spectro-photometric changes as a function of orbital phase.}, language = {en} } @phdthesis{Borisova2012, author = {Borisova, Dimitriya}, title = {Feedback active coatings based on mesoporous silica containers}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-63505}, school = {Universit{\"a}t Potsdam}, year = {2012}, abstract = {Metalle werden oft w{\"a}hrend ihrer Anwendung korrosiven Bedingungen ausgesetzt, was ihre Alterungsbest{\"a}ndigkeit reduziert. Deswegen werden korrosionsanf{\"a}llige Metalle, wie Aluminiumlegierungen mit Schutzbeschichtungen versehen, um den Korrosionsprozess aktiv oder passiv zu verhindern. Die klassischen Schutzbeschichtungen funktionieren als physikalische Barriere zwischen Metall und korrosiver Umgebung und bieten einen passiven Korrosionsschutz nur, wenn sie unbesch{\"a}digt sind. Im Gegensatz dazu kann die Korrosion auch im Fall einer Besch{\"a}digung mittels aktiver Schutzbeschichtungen gehemmt werden. Chromathaltige Beschichtungen bieten heutzutage den besten aktiven Korrosionsschutz f{\"u}r Aluminiumlegierungen. Aufgrund ihrer Giftigkeit wurden diese weltweit verboten und m{\"u}ssen durch neue umweltfreundliche Schutzbeschichtungen ersetzt werden. Ein potentieller Ersatz sind Schutzbeschichtungen mit integrierten Nano- und Mikrobeh{\"a}ltern, die mit ungiftigem Inhibitor gef{\"u}llt sind. In dieser Arbeit werden die Entwicklung und Optimierung solcher aktiver Schutzbeschichtungen f{\"u}r die industriell wichtige Aluminiumlegierung AA2024-T3 dargestellt Mesopor{\"o}se Silika-Beh{\"a}lter wurden mit dem ungiftigen Inhibitor (2-Mercaptobenzothiazol) beladen und dann in die Matrix anorganischer (SiOx/ZrOx) oder organischer (wasserbasiert) Schichten dispergiert. Zwei Sorten von Silika-Beh{\"a}ltern mit unterschiedlichen Gr{\"o}ßen (d ≈ 80 and 700 nm) wurden verwendet. Diese haben eine große spezifische Oberfl{\"a}che (≈ 1000 m² g-1), eine enge Porengr{\"o}ßenverteilung mit mittlerer Porenweite ≈ 3 nm und ein großes Porenvolumen (≈ 1 mL g-1). Dank dieser Eigenschaften k{\"o}nnen große Inhibitormengen im Beh{\"a}lterinneren adsorbiert und gehalten werden. Die Inhibitormolek{\"u}le werden bei korrosionsbedingter Erh{\"o}hung des pH-Wertes gel{\"o}st und freigegeben. Die Konzentration, Position und Gr{\"o}ße der integrierten Beh{\"a}lter wurden variiert um die besten Bedingungen f{\"u}r einen optimalen Korrosionsschutz zu bestimmen. Es wurde festgestellt, dass eine gute Korrosionsschutzleistung durch einen Kompromiss zwischen ausreichender Inhibitormenge und guten Barriereeigenschaften hervorgerufen wird. Diese Studie erweitert das Wissen {\"u}ber die wichtigsten Faktoren, die den Korrosionsschutz beeinflussen. Somit wurde die Entwicklung effizienter, aktiver Schutzbeschichtungen erm{\"o}glicht, die auf mit Inhibitor beladenen Beh{\"a}ltern basieren.}, language = {en} } @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} } @inproceedings{Barthelemy2008, author = {Barth{\´e}lemy, Fran{\c{c}}ois}, title = {Finite-state compilation of feature structures for two-level morphology}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-27120}, year = {2008}, abstract = {This paper describes a two-level formalism where feature structures are used in contextual rules. Whereas usual two-level grammars describe rational sets over symbol pairs, this new formalism uses tree structured regular expressions. They allow an explicit and precise definition of the scope of feature structures. A given surface form may be described using several feature structures. Feature unification is expressed in contextual rules using variables, like in a unification grammar. Grammars are compiled in finite state multi-tape transducers.}, language = {en} } @inproceedings{ZarriessSeeker2008, author = {Zarrieß, Sina and Seeker, Wolfgang}, title = {Finite-state rule deduction for parsing non-constituent coordination}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-27254}, year = {2008}, abstract = {In this paper, we present a finite-state approach to constituency and therewith an analysis of coordination phenomena involving so-called non-constituents. We show that non-constituents can be seen as parts of fully-fledged constituents and therefore be coordinated in the same way. We have implemented an algorithm based on finite state automata that generates an LFG grammar assigning valid analyses to non-constituent coordination structures in the German language.}, language = {en} } @article{Kubozono2007, author = {Kubozono, Haruo}, title = {Focus and intonation in Japanese}, series = {Interdisciplinary studies on information structure : ISIS ; working papers of the SFB 632}, volume = {9}, journal = {Interdisciplinary studies on information structure : ISIS ; working papers of the SFB 632}, editor = {Ishihara, Shinichiro and Petrova, Svetlana and Schwarz, Anne}, publisher = {Universit{\"a}tsverlag Potsdam}, address = {Potsdam}, issn = {1866-4725}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-24472}, pages = {1 -- 27}, year = {2007}, abstract = {This paper discusses how focus changes prosodic structure in Tokyo Japanese. It is generally believed that focus blocks the intonational process of downstep and causes a pitch reset. This paper presents experimental evidence against this traditional view by looking at the prosodic behavior of Wh words, which receive focus lexically in Japanese as in other languages. It is demonstrated, specifically, that the focused Wh element does not block downstep although it receives a much higher pitch than its preceding element. This suggests that presence of lexical focus does not trigger pitch reset in Japanese.}, language = {en} } @article{HartmannZimmermann2004, author = {Hartmann, Katharina and Zimmermann, Malte}, title = {Focus strategies in chadic}, series = {Interdisciplinary studies on information structure : ISIS ; working papers of the SFB 632}, journal = {Interdisciplinary studies on information structure : ISIS ; working papers of the SFB 632}, number = {1}, issn = {1866-4725}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-8423}, pages = {207 -- 243}, year = {2004}, abstract = {We argue that the standard focus theories reach their limits when confronted with the focus systems of the Chadic languages. The backbone of the standard focus theories consists of two assumptions, both called into question by the languages under consideration. Firstly, it is standardly assumed that focus is generally marked by stress. The Chadic languages, however, exhibit a variety of different devices for focus marking. Secondly, it is assumed that focus is always marked. In Tangale, at least, focus is not marked consistently on all types of constituents. The paper offers two possible solutions to this dilemma.}, language = {en} } @book{GabbertWeikard1998, author = {Gabbert, Silke and Weikard, Hans-Peter}, title = {Food deficits, food security and food aid : concepts and measurement}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-8589}, publisher = {Universit{\"a}t Potsdam}, year = {1998}, abstract = {The concepts of food deficit, hunger, undernourishment and food security are discussed. Axioms and indices for the assessment of nutrition of individuals and groups are suggested. Furthermore a measure for food aid donor performance is developed and applied to a sample of bilateral and multilateral donors providing food aid for African countries.}, language = {en} } @techreport{HunoldPetrishcheva2022, type = {Working Paper}, author = {Hunold, Matthias and Petrishcheva, Vasilisa}, title = {Foreclosure and Tunneling with Partial Vertical Ownership}, series = {CEPA Discussion Papers}, journal = {CEPA Discussion Papers}, number = {57}, issn = {2628-653X}, doi = {10.25932/publishup-56560}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-565601}, pages = {47}, year = {2022}, abstract = {We demonstrate how the incentives of firms that partially own their suppliers or customers to foreclose rivals depend on how the partial owner can extract profits from the target (tunneling). Compared to a fully vertically integrated firm, a partial owner may obtain only a share of the target's profit but influence the target's strategy significantly. We show that the incentives for customer and input foreclosure can be higher, equal, or even lower with partial ownership than with a vertical merger, depending on how the protection of minority shareholders and transfer price regulations affect the scope for profit extraction.}, language = {en} } @inproceedings{LascaridesStone2006, author = {Lascarides, Alex and Stone, Matthew}, title = {Formal semantics for iconic gesture}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-10330}, year = {2006}, abstract = {We present a formal analysis of iconic coverbal gesture. Our model describes the incomplete meaning of gesture that's derivable from its form, and the pragmatic reasoning that yields a more specific interpretation. Our formalism builds on established models of discourse interpretation to capture key insights from the descriptive literature on gesture: synchronous speech and gesture express a single thought, but while the form of iconic gesture is an important clue to its interpretation, the content of gesture can be resolved only by linking it to its context.}, language = {en} } @inproceedings{BeyssadeMarandin2006, author = {Beyssade, Claire and Marandin, Jean-Marie}, title = {From complex to simple speech acts : a bidimensional analysis of illocutionary}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-10319}, year = {2006}, abstract = {We present a new analysis of illocutionary forces in dialogue. We analyze them as complex conversational moves involving two dimensions: what Speaker commits herself to and what she calls on Addressee to perform. We start from the analysis of speech acts such as confirmation requests or whimperatives, and extend the analysis to seemingly simple speech acts, such as statements and queries. Then, we show how to integrate our proposal in the framework of the Grammar for Conversation (Ginzburg, to app.), which is adequate for modelling agents' information states and how they get updated.}, language = {en} } @inproceedings{PoppBlaumDomptailetal.2006, author = {Popp, Alexander and Blaum, Niels and Domptail, Stephanie and Herpel, Nicole and Gr{\"o}ngr{\"o}ft, Alexander and Hoffman, T. T. and J{\"u}rgens, Norbert and Milton, Sue and Nuppenau, Ernst-August and Rossmanith, Eva and Schmidt, Michael and Vogel, Melanie and Vohland, Katrin and Jeltsch, Florian}, title = {From satellite imagery to soil-plant interactions}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-7302}, year = {2006}, abstract = {Decisions for the conservation of biodiversity and sustainable management of natural resources are typically related to large scales, i.e. the landscape level. However, understanding and predicting the effects of land use and climate change on scales relevant for decision-making requires to include both, large scale vegetation dynamics and small scale processes, such as soil-plant interactions. Integrating the results of multiple BIOTA subprojects enabled us to include necessary data of soil science, botany, socio-economics and remote sensing into a high resolution, process-based and spatially-explicit model. Using an example from a sustainably-used research farm and a communally used and degraded farming area in semiarid southern Namibia we show the power of simulation models as a tool to integrate processes across disciplines and scales.}, language = {en} } @misc{HoehleWeissenbornKieferetal.2004, author = {H{\"o}hle, Barbara and Weissenborn, J{\"u}rgen and Kiefer, Dorothea and Schulz, Antje and Schmitz, Michaela}, title = {Functional elements in infants' speech processing : the role of determiners in the syntactic categorization of lexical elements}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-16285}, year = {2004}, abstract = {How do children determine the syntactic category of novel words? In this article we present the results of 2 experiments that investigated whether German children between 12 and 16 months of age can use distributional knowledge that determiners precede nouns and subject pronouns precede verbs to syntactically categorize adjacent novel words. Evidence from the head-turn preference paradigm shows that, although 12- to 13-month-olds cannot do this, 14- to 16-month-olds are able to use a determiner to categorize a following novel word as a noun. In contrast, no categorization effect was found for a novel word following a subject pronoun. To understand this difference we analyzed adult child-directed speech. This analysis showed that there are in fact stronger co-occurrence relations between determiners and nouns than between subject pronouns and verbs. Thus, in German determiners may be more reliable cues to the syntactic category of an adjacent novel word than are subject pronouns. We propose that the capacity to syntactically categorize novel words, demonstrated here for the first time in children this young, mediates between the recognition of the specific morphosyntactic frame in which a novel word appears and the word-to-world mapping that is needed to build up a semantic representation for the novel word.}, language = {en} } @techreport{Becker2004, type = {Working Paper}, author = {Becker, Ralf E.}, title = {General classification of social choice situations}, series = {Finanzwissenschaftliche Diskussionsbeitr{\"a}ge}, journal = {Finanzwissenschaftliche Diskussionsbeitr{\"a}ge}, number = {46}, issn = {0948-7549}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-9012}, year = {2004}, abstract = {An exhaustive and disjoint decomposition of social choice situations is derived in a general set theoretical framework using the new tools of the Lifted Pareto relation on the power set of social states representing a pre-choice comparison of choice option sets. The main result is the classification of social choice situations which include three types of social choice problems. First, we usually observe the common incompleteness of the Pareto relation. Second, a kind of non-compactness problem of a choice set of social states can be generated. Finally, both can be combined. The first problem root can be regarded as natural everyday dilemma of social choice theory whereas the second may probably be much more due to modeling technique implications. The distinction is enabled at a very general set theoretical level. Hence, the derived classification of social choice situations is applicable on almost every relevant economic model.}, language = {en} } @inproceedings{MoffatHillierHamannetal.2007, author = {Moffat, Anthony F. J. and Hillier, D. J. and Hamann, Wolf-Rainer and Owocki, S. P.}, title = {General Discussion}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-17953}, year = {2007}, abstract = {Clumping in hot-star winds : proceedings of an international workshop held in Potsdam, Germany, 18. - 22. June 2007}, language = {en} } @phdthesis{Steding2022, author = {Steding, Svenja}, title = {Geochemical and Hydraulic Modeling of Cavernous Structures in Potash Seams}, doi = {10.25932/publishup-54818}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-548182}, school = {Universit{\"a}t Potsdam}, pages = {IX, 104}, year = {2022}, abstract = {Salt deposits offer a variety of usage types. These include the mining of rock salt and potash salt as important raw materials, the storage of energy in man-made underground caverns, and the disposal of hazardous substances in former mines. The most serious risk with any of these usage types comes from the contact with groundwater or surface water. It causes an uncontrolled dissolution of salt rock, which in the worst case can result in the flooding or collapse of underground facilities. Especially along potash seams, cavernous structures can spread quickly, because potash salts show a much higher solubility than rock salt. However, as their chemical behavior is quite complex, previous models do not account for these highly soluble interlayers. Therefore, the objective of the present thesis is to describe the evolution of cavernous structures along potash seams in space and time in order to improve hazard mitigation during the utilization of salt deposits. The formation of cavernous structures represents an interplay of chemical and hydraulic processes. Hence, the first step is to systematically investigate the dissolution and precipitation reactions that occur when water and potash salt come into contact. For this purpose, a geochemical reaction model is used. The results show that the minerals are only partially dissolved, resulting in a porous sponge like structure. With the saturation of the solution increasing, various secondary minerals are formed, whose number and type depend on the original rock composition. Field data confirm a correlation between the degree of saturation and the distance from the center of the cavern, where solution is entering. Subsequently, the reaction model is coupled with a flow and transport code and supplemented by a novel approach called 'interchange'. The latter enables the exchange of solution and rock between areas of different porosity and mineralogy, and thus ultimately the growth of the cavernous structure. By means of several scenario analyses, cavern shape, growth rate and mineralogy are systematically investigated, taking also heterogeneous potash seams into account. The results show that basically four different cases can be distinguished, with mixed forms being a frequent occurrence in nature. The classification scheme is based on the dimensionless numbers P{\´e}clet and Damk{\"o}hler, and allows for a first assessment of the hazard potential. In future, the model can be applied to any field case, using measurement data for calibration. The presented research work provides a reactive transport model that is able to spatially and temporally characterize the propagation of cavernous structures along potash seams for the first time. Furthermore, it allows to determine thickness and composition of transition zones between cavern center and unaffected salt rock. The latter is particularly important in potash mining, so that natural cavernous structures can be located at an early stage and the risk of mine flooding can thus be reduced. The models may also contribute to an improved hazard prevention in the construction of storage caverns and the disposal of hazardous waste in salt deposits. Predictions regarding the characteristics and evolution of cavernous structures enable a better assessment of potential hazards, such as integrity or stability loss, as well as of suitable mitigation measures.}, language = {en} } @phdthesis{Radeff2014, author = {Radeff, Giuditta}, title = {Geohistory of the Central Anatolian Plateau southern margin (southern Turkey)}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-71865}, school = {Universit{\"a}t Potsdam}, year = {2014}, abstract = {The Adana Basin of southern Turkey, situated at the SE margin of the Central Anatolian Plateau is ideally located to record Neogene topographic and tectonic changes in the easternmost Mediterranean realm. Using industry seismic reflection data we correlate 34 seismic profiles with corresponding exposed units in the Adana Basin. The time-depth conversion of the interpreted seismic profiles allows us to reconstruct the subsidence curve of the Adana Basin and to outline the occurrence of a major increase in both subsidence and sedimentation rates at 5.45 - 5.33 Ma, leading to the deposition of almost 1500 km3 of conglomerates and marls. Our provenance analysis of the conglomerates reveals that most of the sediment is derived from and north of the SE margin of the Central Anatolian Plateau. A comparison of these results with the composition of recent conglomerates and the present drainage basins indicates major changes between late Messinian and present-day source areas. We suggest that these changes in source areas result of uplift and ensuing erosion of the SE margin of the plateau. This hypothesis is supported by the comparison of the Adana Basin subsidence curve with the subsidence curve of the Mut Basin, a mainly Neogene basin located on top of the Central Anatolian Plateau southern margin, showing that the Adana Basin subsidence event is coeval with an uplift episode of the plateau southern margin. The collection of several fault measurements in the Adana region show different deformation styles for the NW and SE margins of the Adana Basin. The weakly seismic NW portion of the basin is characterized by extensional and transtensional structures cutting Neogene deposits, likely accomodating the differential uplift occurring between the basin and the SE margin of the plateau. We interpret the tectonic evolution of the southern flank of the Central Anatolian Plateau and the coeval subsidence and sedimentation in the Adana Basin to be related to deep lithospheric processes, particularly lithospheric delamination and slab break-off.}, language = {en} } @inproceedings{MaerkerSchroederEsselbachCapolongoetal.2006, author = {M{\"a}rker, Michael and Schr{\"o}der-Esselbach, Boris and Capolongo, Domenico and Bentivenga, Mario}, title = {Geomorphological and pedological processes in badland areas of Southern Italy and their interaction with Mediterranean vegetation}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-7288}, year = {2006}, abstract = {Interdisziplin{\"a}res Zentrum f{\"u}r Musterdynamik und Angewandte Fernerkundung Workshop vom 9. - 10. Februar 2006}, language = {en} } @misc{HoffmannLonghurst1999, author = {Hoffmann, Arthur and Longhurst, Kerry}, title = {German strategic culture and the changing role of the Bundeswehr}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-11448}, year = {1999}, abstract = {The article mobilises the concept of strategic culture in order to identify the impact of history upon contemporary security policy. The article will first look at the "wholesale construction" of a strategic culture after the Second World War in West Germany before exploring its impact upon security policy since the end of the Cold War in two areas: the Bundeswehr's out-of-area role and conscription. The central argument presented here is that the strategic culture of the former Federal Republic now writ large on to the new united Germany sets the context within which security policies are designed. This strategic culture, as will be argued, acts as both a facilitating and a restraining variable on behaviour, making certain policy options possible and others impossible.}, language = {en} } @techreport{LudolphŠedova2021, type = {Working Paper}, author = {Ludolph, Lars and Šedov{\´a}, Barbora}, title = {Global food prices, local weather and migration in Sub-Saharan Africa}, series = {CEPA Discussion Papers}, journal = {CEPA Discussion Papers}, number = {26}, issn = {2628-653X}, doi = {10.25932/publishup-49494}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-494946}, pages = {53}, year = {2021}, abstract = {In this paper, we study the effect of exogenous global crop price changes on migration from agricultural and non-agricultural households in Sub-Saharan Africa. We show that, similar to the effect of positive local weather shocks, the effect of a locally-relevant global crop price increase on household out-migration depends on the initial household wealth. Higher international producer prices relax the budget constraint of poor agricultural households and facilitate migration. The order of magnitude of a standardized price effect is approx. one third of the standardized effect of a local weather shock. Unlike positive weather shocks, which mostly facilitate internal rural-urban migration, positive income shocks through rising producer prices only increase migration to neighboring African countries, likely due to the simultaneous decrease in real income in nearby urban areas. Finally, we show that while higher producer prices induce conflict, conflict does not play a role for the household decision to send a member as a labor migrant.}, language = {en} } @article{Harvey2001, author = {Harvey, David}, title = {Globalization and the "Spatial Fix"}, series = {Geographische Revue : Zeitschrift f{\"u}r Literatur und Diskussion}, volume = {3}, journal = {Geographische Revue : Zeitschrift f{\"u}r Literatur und Diskussion}, number = {2}, issn = {1438-3039}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-24366}, pages = {23 -- 30}, year = {2001}, language = {en} } @inproceedings{SagetGuyomard2006, author = {Saget, Sylvie and Guyomard, Marc}, title = {Goal-oriented dialog as a collaborative subordinated activity involving collective acceptance}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-10420}, year = {2006}, abstract = {Modeling dialog as a collaborative activity consists notably in specifying the contain of the Conversational Common Ground and the kind of social mental state involved. In previous work (Saget, 2006), we claim that Collective Acceptance is the proper social attitude for modeling Conversational Common Ground in the particular case of goal-oriented dialog. We provide a formalization of Collective Acceptance, besides elements in order to integrate this attitude in a rational model of dialog are provided; and finally, a model of referential acts as being part of a collaborative activity is provided. The particular case of reference has been chosen in order to exemplify our claims.}, language = {en} } @phdthesis{Hoechner2010, author = {H{\"o}chner, Andreas}, title = {GPS based analysis of earthquake induced phenomena at the Sunda Arc}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-53166}, school = {Universit{\"a}t Potsdam}, year = {2010}, abstract = {Indonesia is one of the countries most prone to natural hazards. Complex interaction of several tectonic plates with high relative velocities leads to approximately two earthquakes with magnitude Mw>7 every year, being more than 15\% of the events worldwide. Earthquakes with magnitude above 9 happen far more infrequently, but with catastrophic effects. The most severe consequences thereby arise from tsunamis triggered by these subduction-related earthquakes, as the Sumatra-Andaman event in 2004 showed. In order to enable efficient tsunami early warning, which includes the estimation of wave heights and arrival times, it is necessary to combine different types of real-time sensor data with numerical models of earthquake sources and tsunami propagation. This thesis was created as a result of the GITEWS project (German Indonesian Tsunami Early Warning System). It is based on five research papers and manuscripts. Main project-related task was the development of a database containing realistic earthquake scenarios for the Sunda Arc. This database provides initial conditions for tsunami propagation modeling used by the simulation system at the early warning center. An accurate discretization of the subduction geometry, consisting of 25x150 subfaults was constructed based on seismic data. Green's functions, representing the deformational response to unit dip- and strike slip at the subfaults, were computed using a layered half-space approach. Different scaling relations for earthquake dimensions and slip distribution were implemented. Another project-related task was the further development of the 'GPS-shield' concept. It consists of a constellation of near field GPS-receivers, which are shown to be very valuable for tsunami early warning. The major part of this thesis is related to the geophysical interpretation of GPS data. Coseismic surface displacements caused by the 2004 Sumatra earthquake are inverted for slip at the fault. The effect of different Earth layer models is tested, favoring continental structure. The possibility of splay faulting is considered and shown to be a secondary order effect in respect to tsunamigenity for this event. Tsunami models based on source inversions are compared to satellite radar altimetry observations. Postseismic GPS time series are used to test a wide parameter range of uni- and biviscous rheological models of the asthenosphere. Steady-state Maxwell rheology is shown to be incompatible with near-field GPS data, unless large afterslip, amounting to more than 10\% of the coseismic moment is assumed. In contrast, transient Burgers rheology is in agreement with data without the need for large aseismic afterslip. Comparison to postseismic geoid observation by the GRACE satellites reveals that even with afterslip, the model implementing Maxwell rheology results in amplitudes being too small, and thus supports a biviscous asthenosphere. A simple approach based on the assumption of quasi-static deformation propagation is introduced and proposed for inversion of coseismic near-field GPS time series. Application of this approach to observations from the 2004 Sumatra event fails to quantitatively reconstruct the rupture propagation, since a priori conditions are not fulfilled in this case. However, synthetic tests reveal the feasibility of such an approach for fast estimation of rupturing properties.}, language = {en} } @book{OPUS4-6251, title = {Grammatica Grandonica}, editor = {Van Hal, Toon and Vielle, Christophe}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-63218}, publisher = {Universit{\"a}t Potsdam}, pages = {280}, year = {2013}, abstract = {In May 2010, Johann Ernst Hanxleden's Grammatica Grandonica was rediscovered in Montecompatri (Lazio, Rome). Although historiographers attached much weight to the nearly oldest western grammar of Sanskrit, the precious manuscript was lost for several decades. The first aim of the present digital publication is to offer a photographical reproduction of the manuscript. This facsimile is accompanied by a double edition: a facing diplomatic edition with the Sanskrit in Malayāḷam script, followed by a transliterated established text.}, language = {en} } @phdthesis{Ziege2022, author = {Ziege, Ricardo}, title = {Growth dynamics and mechanical properties of E. coli biofilms}, doi = {10.25932/publishup-55986}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-559869}, school = {Universit{\"a}t Potsdam}, pages = {xi, 123}, year = {2022}, abstract = {Biofilms are complex living materials that form as bacteria get embedded in a matrix of self-produced protein and polysaccharide fibres. The formation of a network of extracellular biopolymer fibres contributes to the cohesion of the biofilm by promoting cell-cell attachment and by mediating biofilm-substrate interactions. This sessile mode of bacteria growth has been well studied by microbiologists to prevent the detrimental effects of biofilms in medical and industrial settings. Indeed, biofilms are associated with increased antibiotic resistance in bacterial infections, and they can also cause clogging of pipelines or promote bio-corrosion. However, biofilms also gained interest from biophysics due to their ability to form complex morphological patterns during growth. Recently, the emerging field of engineered living materials investigates biofilm mechanical properties at multiple length scales and leverages the tools of synthetic biology to tune the functions of their constitutive biopolymers. This doctoral thesis aims at clarifying how the morphogenesis of Escherichia coli (E. coli) biofilms is influenced by their growth dynamics and mechanical properties. To address this question, I used methods from cell mechanics and materials science. I first studied how biological activity in biofilms gives rise to non-uniform growth patterns. In a second study, I investigated how E. coli biofilm morphogenesis and its mechanical properties adapt to an environmental stimulus, namely the water content of their substrate. Finally, I estimated how the mechanical properties of E. coli biofilms are altered when the bacteria express different extracellular biopolymers. On nutritive hydrogels, micron-sized E. coli cells can build centimetre-large biofilms. During this process, bacterial proliferation and matrix production introduce mechanical stresses in the biofilm, which release through the formation of macroscopic wrinkles and delaminated buckles. To relate these biological and mechanical phenomena, I used time-lapse fluorescence imaging to track cell and matrix surface densities through the early and late stages of E. coli biofilm growth. Colocalization of high cell and matrix densities at the periphery precede the onset of mechanical instabilities at this annular region. Early growth is detected at this outer annulus, which was analysed by adding fluorescent microspheres to the bacterial inoculum. But only when high rates of matrix production are present in the biofilm centre, does overall biofilm spreading initiate along the solid-air interface. By tracking larger fluorescent particles for a long time, I could distinguish several kinematic stages of E. coli biofilm expansion and observed a transition from non-linear to linear velocity profiles, which precedes the emergence of wrinkles at the biofilm periphery. Decomposing particle velocities to their radial and circumferential components revealed a last kinematic stage, where biofilm movement is mostly directed towards the radial delaminated buckles, which verticalize. The resulting compressive strains computed in these regions were observed to substantially deform the underlying agar substrates. The co-localization of higher cell and matrix densities towards an annular region and the succession of several kinematic stages are thus expected to promote the emergence of mechanical instabilities at the biofilm periphery. These experimental findings are predicted to advance future modelling approaches of biofilm morphogenesis. E. coli biofilm morphogenesis is further anticipated to depend on external stimuli from the environment. To clarify how the water could be used to tune biofilm material properties, we quantified E. coli biofilm growth, wrinkling dynamics and rigidity as a function of the water content of the nutritive substrates. Time-lapse microscopy and computational image analysis revealed that substrates with high water content promote biofilm spreading kinetics, while substrates with low water content promote biofilm wrinkling. The wrinkles observed on biofilm cross-sections appeared more bent on substrates with high water content, while they tended to be more vertical on substrates with low water content. Both wet and dry biomass, accumulated over 4 days of culture, were larger in biofilms cultured on substrates with high water content, despite extra porosity within the matrix layer. Finally, the micro-indentation analysis revealed that substrates with low water content supported the formation of stiffer biofilms. This study shows that E. coli biofilms respond to the water content of their substrate, which might be used for tuning their material properties in view of further applications. Biofilm material properties further depend on the composition and structure of the matrix of extracellular proteins and polysaccharides. In particular, E. coli biofilms were suggested to present tissue-like elasticity due to a dense fibre network consisting of amyloid curli and phosphoethanolamine-modified cellulose. To understand the contribution of these components to the emergent mechanical properties of E. coli biofilms, we performed micro-indentation on biofilms grown from bacteria of several strains. Besides showing higher dry masses, larger spreading diameters and slightly reduced water contents, biofilms expressing both main matrix components also presented high rigidities in the range of several hundred kPa, similar to biofilms containing only curli fibres. In contrast, a lack of amyloid curli fibres provides much higher adhesive energies and more viscoelastic fluid-like material behaviour. Therefore, the combination of amyloid curli and phosphoethanolamine-modified cellulose fibres implies the formation of a composite material whereby the amyloid curli fibres provide rigidity to E. coli biofilms, whereas the phosphoethanolamine-modified cellulose rather acts as a glue. These findings motivate further studies involving purified versions of these protein and polysaccharide components to better understand how their interactions benefit biofilm functions. All three studies depict different aspects of biofilm morphogenesis, which are interrelated. The first work reveals the correlation between non-uniform biological activities and the emergence of mechanical instabilities in the biofilm. The second work acknowledges the adaptive nature of E. coli biofilm morphogenesis and its mechanical properties to an environmental stimulus, namely water. Finally, the last study reveals the complementary role of the individual matrix components in the formation of a stable biofilm material, which not only forms complex morphologies but also functions as a protective shield for the bacteria it contains. Our experimental findings on E. coli biofilm morphogenesis and their mechanical properties can have further implications for fundamental and applied biofilm research fields.}, language = {en} } @article{Csaky2024, author = {Cs{\´a}ky, Moritz}, title = {Habsburg Central Europe}, series = {PaRDeS}, journal = {PaRDeS}, number = {29}, publisher = {Universit{\"a}tsverlag Potsdam}, address = {Potsdam}, isbn = {978-3-86956-574-3}, issn = {1614-6492}, doi = {10.25932/publishup-64599}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-645995}, pages = {31 -- 37}, year = {2024}, abstract = {Central Europe is characterized by linguistic and cultural density as well as by endogenous and exogenous cultural influences. These constellations were especially visible in the former Habsburg Empire, where they influenced the formation of individual and collective identities. This led not only to continual crises and conflicts, but also to an equally enormous creative potential as became apparent in the culture of the fin-de-si{\`e}cle.}, language = {en} } @techreport{GraeberSchikora2021, type = {Working Paper}, author = {Graeber, Daniel and Schikora, Felicitas}, title = {Hate is too great a burden to bear}, series = {CEPA Discussion Papers}, journal = {CEPA Discussion Papers}, number = {31}, issn = {2628-653X}, doi = {10.25932/publishup-50797}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-507972}, pages = {53}, year = {2021}, abstract = {Against a background of increasing violence against non-natives, we estimate the effect of hate crime on refugees' mental health in Germany. For this purpose, we combine two datasets: administrative records on xenophobic crime against refugee shelters by the Federal Criminal Office and the IAB-BAMF-SOEP Survey of Refugees. We apply a regression discontinuity in time design to estimate the effect of interest. Our results indicate that hate crime has a substantial negative effect on several mental health indicators, including the Mental Component Summary score and the Patient Health Questionnaire-4 score. The effects are stronger for refugees with closer geographic proximity to the focal hate crime and refugees with low country-specific human capital. While the estimated effect is only transitory, we argue that negative mental health shocks during the critical period after arrival have important long-term consequences. Keywords: Mental health, hate crime, migration, refugees, human capital.}, language = {en} } @misc{Sidky2024, author = {Sidky, Sean}, title = {Heike Bauer, Andrea Greenbaum, Sarah Lightman, eds., Jewish Women in Comics: Bodies and Borders (Syracuse, NY: Syracuse University Press, 2023), 296 pp.}, series = {PaRDeS}, journal = {PaRDeS}, number = {29}, publisher = {Universit{\"a}tsverlag Potsdam}, address = {Potsdam}, isbn = {978-3-86956-574-3}, issn = {1614-6492}, doi = {10.25932/publishup-65126}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-651268}, pages = {178 -- 180}, year = {2024}, language = {en} } @unpublished{DemircanScheelSeehafer1999, author = {Demircan, Ayhan and Scheel, Stefan and Seehafer, Norbert}, title = {Heteroclinic behavior in rotating Rayleigh-B{\´e}nard convection}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-14914}, year = {1999}, abstract = {We investigate numerically the appearance of heteroclinic behavior in a three-dimensional, buoyancy-driven fluid layer with stress-free top and bottom boundaries, a square horizontal periodicity with a small aspect ratio, and rotation at low to moderate rates about a vertical axis. The Prandtl number is 6.8. If the rotation is not too slow, the skewed-varicose instability leads from stationary rolls to a stationary mixed-mode solution, which in turn loses stability to a heteroclinic cycle formed by unstable roll states and connections between them. The unstable eigenvectors of these roll states are also of the skewed-varicose or mixed-mode type and in some parameter regions skewed-varicose like shearing oscillations as well as square patterns are involved in the cycle. Always present weak noise leads to irregular horizontal translations of the convection pattern and makes the dynamics chaotic, which is verified by calculating Lyapunov exponents. In the nonrotating case, the primary rolls lose, depending on the aspect ratio, stability to traveling waves or a stationary square pattern. We also study the symmetries of the solutions at the intermittent fixed points in the heteroclinic cycle.}, language = {en} } @article{Luedeling2005, author = {L{\"u}deling, Anke}, title = {Heterogeneity and standardization in data, use, and annotation}, series = {Interdisciplinary studies on information structure : ISIS ; working papers of the SFB 632}, journal = {Interdisciplinary studies on information structure : ISIS ; working papers of the SFB 632}, number = {2}, issn = {1866-4725}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-8643}, pages = {43 -- 54}, year = {2005}, abstract = {This paper describes the standardization problems that come up in a diachronic corpus: it has to cope with differing standards with regard to diplomaticity, annotation, and header information. Such highly het-erogeneous texts must be standardized to allow for comparative re-search without (too much) loss of information.}, language = {en} } @book{OPUS4-723, title = {Heterogeneity in focus : creating and using linguistic databases}, editor = {Dipper, Stefanie and G{\"o}tze, Michael and Stede, Manfred}, publisher = {Universit{\"a}tsverlag Potsdam}, address = {Potsdam}, isbn = {978-3-937786-48-3}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-8244}, publisher = {Universit{\"a}t Potsdam}, pages = {145}, year = {2005}, abstract = {The papers in this volume were presented at the workshop Heterogeneity in Linguistic Databases', which took place on July 9, 2004 at the University of Potsdam. The workshop was organized by project D1: Linguistic Database for Information Structure: Annotation and Retrieval', a member project of the SFB 632, a collaborative research center entitled Information Structure: the Linguistic Means for Structuring Utterances, Sentences and Texts'. The workshop brought together both developers and users of linguistic databases from a number of research projects which work on an empirical basis, all of which have to cope with different sorts of heterogeneity: primary linguistic data and annotated information may be heterogeneous, as well as the data structures representing them. The first four papers (by Wagner, Schmidt, L{\"u}deling, and Witt) address aspects of heterogeneous data from the point of view of database developers; the remaining three papers (by Meyer, Smith, and Teich/Fankhauser) focus on data exploitation by the users.}, language = {en} } @techreport{AndresBruttelFriedrichsen2022, type = {Working Paper}, author = {Andres, Maximilian and Bruttel, Lisa Verena and Friedrichsen, Jana}, title = {How communication makes the difference between a cartel and tacit collusion}, series = {CEPA Discussion Papers}, journal = {CEPA Discussion Papers}, issn = {2628-653X}, doi = {10.25932/publishup-56223}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-562234}, pages = {67}, year = {2022}, abstract = {This paper sheds new light on the role of communication for cartel formation. Using machine learning to evaluate free-form chat communication among firms in a laboratory experiment, we identify typical communication patterns for both explicit cartel formation and indirect attempts to collude tacitly. We document that firms are less likely to communicate explicitly about price fixing and more likely to use indirect messages when sanctioning institutions are present. This effect of sanctions on communication reinforces the direct cartel-deterring effect of sanctions as collusion is more difficult to reach and sustain without an explicit agreement. Indirect messages have no, or even a negative, effect on prices.}, language = {en} } @article{KlempinRehfeldt2023, author = {Klempin, Christiane and Rehfeldt, Daniel}, title = {How to Promote and Measure Reflective Skills in Depth and Breadth of English and Physics Teacher Trainees}, 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-61938}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-619381}, pages = {115 -- 121}, year = {2023}, abstract = {Supporting reflection in preservice during university-based training is, without doubt, a crucial aspect in attaining teacher professionalism. Therefore, an on-campus seminar designed to relate theory to practice and vice versa - the so-called 'Lehr-Lern-Labor-Seminar (LLLS)' - was implemented over the course of five terms to stimulate reflective skills of English and Physics teacher trainees. Investigations on the effectiveness of three types of the LLLS (no video and two types of video-supported reflections) compared to a parallel group (PG) and a control group (CG) occurred in a mixed methods quasi-experimental study. Reflective skills were elicited with vignettes, relevant covariates with questionnaires. Reflective development was then traced in the dimensions depth and breadth employing a qualitative content analysis. MANCOVA (Multivariate Analysis of Covariance) and regression analyses revealed a substantive increase of reflective depth for English and Physics teacher trainees and breadth development for English LLLS-participants in contrast to both, a PG and a CG, even when controlling for the subjects' individual prerequisites.}, language = {en} } @techreport{EydamDiluiso2022, type = {Working Paper}, author = {Eydam, Ulrich and Diluiso, Francesca}, title = {How to Redistribute the Revenues from Climate Policy?}, series = {CEPA Discussion Papers}, journal = {CEPA Discussion Papers}, number = {45}, issn = {2628-653X}, doi = {10.25932/publishup-54896}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-548960}, pages = {32}, year = {2022}, abstract = {In light of climate change mitigation efforts, revenues from climate policies are growing, with no consensus yet on how they should be used. Potential efficiency gains from reducing distortionary taxes and the distributional implications of different revenue recycling schemes are currently debated. To account for households heterogeneity and dynamic trade-offs, we study the macroeconomic and welfare performance of different revenue recycling schemes using an Environmental Two-Agent New-Keynesian model, calibrated on the German economy. We find that, in the long run, welfare gains are higher when revenues are used to reduce distortionary taxes on capital, but this comes at the cost of higher inequality: while all households prefer labor income tax reductions to lump-sum transfers, only financially unconstrained households are better off when reducing taxes on capital income. Interestingly, we find that over the transition period relevant to meet short-medium run climate targets, labor income tax cuts are the most efficient and equitable instrument.}, language = {en} } @misc{DimigenValsecchiSommeretal.2009, author = {Dimigen, Olaf and Valsecchi, Matteo and Sommer, Werner and Kliegl, Reinhold}, title = {Human Microsaccade-Related Visual Brain Responses}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-56923}, year = {2009}, abstract = {Microsaccades are very small, involuntary flicks in eye position that occur on average once or twice per second during attempted visual fixation. Microsaccades give rise to EMG eye muscle spikes that can distort the spectrum of the scalp EEG and mimic increases in gamma band power. Here we demonstrate that microsaccades are also accompanied by genuine and sizeable cortical activity, manifested in the EEG. In three experiments, high-resolution eye movements were corecorded with the EEG: during sustained fixation of checkerboard and face stimuli and in a standard visual oddball task that required the counting of target stimuli. Results show that microsaccades as small as 0.15° generate a field potential over occipital cortex and midcentral scalp sites 100 -140 ms after movement onset, which resembles the visual lambda response evoked by larger voluntary saccades. This challenges the standard assumption of human brain imaging studies that saccade-related brain activity is precluded by fixation, even when fully complied with. Instead, additional cortical potentials from microsaccades were present in 86\% of the oddball task trials and of similar amplitude as the visual response to stimulus onset. Furthermore, microsaccade probability varied systematically according to the proportion of target stimuli in the oddball task, causing modulations of late stimulus-locked event-related potential (ERP) components. Microsaccades present an unrecognized source of visual brain signal that is of interest for vision research and may have influenced the data of many ERP and neuroimaging studies.}, language = {en} }