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This paper focuses on mysteries written by the Afro-American women authors Barbara Neely and Valerie Wilson Wesley. Both authors place a black woman in the role of the detective - an innovative feature not only in the realm of female detective literature of the past two decades but also with regard to the current discourse about race and class in US-American society. This discourse is important because detective novels are considered popular literature and thus a mass product designed to favor commercial instead of literary claims. Thus, the focus is placed on the development of the two protagonists, on their lives as detectives and as black women, in order to find out whether or not and how the genre influences the depiction of Afro-American experiences. It appears that both of these detective series represent Afro-American culture in different ways, which confirms a heterogenic development of this ethnic group. However, the protagonist's search for identity and their relationships to white people could be identified as a major unifying claim of Afro-American literature. With differing intensity, the authors Neely and Wesley provide the white or mainstream reader with insight into their culture and confront the reader's ignorance of black culture. In light of this, it is a great achievement that Neely and Wesley have reached not only a black audience but also a growing number of white readers.
Different habitat models were created for the White Stork (Ciconia ciconia) in the region of the former German province of East Prussia (equals app. the current Russian oblast Kaliningrad and the Polish voivodship Warmia-Masuria). Different historical data sets describing the occurrence of the White Stork in the 1930s, as well as selected variables for the description of landscape and habitat, were employed. The processing and modeling of the applied data sets was done with a geographical information system (ArcGIS) and a statistical modeling approach that comes from the disciplines of machine-learning and data mining (TreeNet by Salford Systems Ltd.). Applying historical habitat descriptors, as well as data on the occurrence of the White Stork, models on two different scales were created: (i) a point scale model applying a raster with a cell size of 1 km2 and (ii) an administrative district scale model based on the organization of the former province of East Prussia. The evaluation of the created models show that the occurrence of White Stork nesting grounds in the former East Prussia for most parts is defined by the variables ‘forest’, ‘settlement area’, ‘pasture land’ and ‘proximity to coastline’. From this set of variables it can be assumed that a good food supply and nesting opportunities are provided to the White Stork in pasture and meadows as well as in the proximity to human settlements. These could be seen as crucial factors for the choice of nesting White Stork in East Prussia. Dense forest areas appear to be unsuited as nesting grounds of White Storks. The high influence of the variable ‘coastline’ is most likely explained by the specific landscape composition of East Prussia parallel to the coastline and is to be seen as a proximal factor for explaining the distribution of breeding White Storks. In a second step, predictions for the period of 1981 to 1993 could be made applying both scales of the models created in this study. In doing so, a decline of potential nesting habitat was predicted on the point scale. In contrast, the predicted White Stork occurrence increases when applying the model of the administrative district scale. The difference between both predictions is to be seen in the application of different scales (density versus suitability as breeding ground) and partly dissimilar explanatory variables. More studies are needed to investigate this phenomenon. The model predictions for the period 1981 to 1993 could be compared to the available inventories of that period. It shows that the figures predicted here were higher than the figures established by the census. This means that the models created here show rather a capacity of the habitat (potential niche). Other factors affecting the population size e.g. breeding success or mortality have to be investigated further. A feasible approach on how to generate possible habitat models was shown employing the methods presented here and applying historical data as well as assessing the effects of changes in land use on the White Stork. The models present the first of their kind, and could be improved by means of further data regarding the structure of the habitat and more exact spatially explicit information on the location of the nesting sites of the White Stork. In a further step, a habitat model of the present times should be created. This would allow for a more precise comparison regarding the findings from the changes of land use and relevant conditions of the environment on the White Stork in the region of former East Prussia, e.g. in the light of coming landscape changes brought by the European Union (EU).
This thesis investigates the Casimir effect between plates made of normal and superconducting metals over a broad range of temperatures, as well as the Casimir-Polder interaction of an atom to such a surface. Numerical and asymptotical calculations have been the main tools in order to do so. The optical properties of the surfaces are described by dielectric functions or optical conductivities, which are reviewed for common models and have been analyzed with special weight on distributional properties and causality. The calculation of the Casimir energy between two normally conducting plates (cavity) is reviewed and previous work on the contribution to the Casimir energy due to the surface plasmons, present in all metallic cavities, has been generalized to finite temperatures for the first time. In the field of superconductivity, a new analytical continuation of the BCS conductivity to to purely imaginary frequencies has been obtained both inside and outside the extremely dirty limit of vanishing mean free path. The Casimir free energy calculated from this description was shown to coincide well with the values obtained from the two fluid model of superconductivity in certain regimes of the material parameters. The Casimir entropy in a superconducting cavity fulfills the third law of thermodynamics and features a characteristic discontinuity at the phase transition temperature. These effects were equally encountered in the Casimir-Polder interaction of an atom with a superconducting wall. The magnetic dipole coupling of an atom to a metal was shown to be highly sensible to dissipation and especially to the surface currents. This leads to a strong quenching of the magnetic Casimir-Polder energy at finite temperature. Violations of the third law of thermodynamics are encountered in special models, similar to phenomena in the Casimir-effect between two plates, that are debated controversely. None of these effects occurs in the analog electric dipole interaction. The results of this work suggest to reestablish the well-known plasma model as the low temperature limit of a superconductor as in London theory rather than use it for the description of normal metals. Superconductors offer the opportunity to control the dissipation of surface currents to a great extent. This could be used to access experimentally the low frequency optical response of metals, which is strongly connected to the thermal Casimir-effect. Here, differently from corresponding microwave experiments, energy and momentum are independent quantities. A measurement of the total Casimir-Polder interaction of atoms with superconductors seems to be in reach in today’s microchip-based atom-traps and the contribution due to magnetic coupling might be accessed by spectroscopic techniques
Bislang konzentrierten sich die Untersuchungen des westdeutschen Blicks auf Ostdeutschland auf den Zeitraum vor der Wende oder auf Rundfunk- und Fernseh-Medien. Die Gegenwartsliteratur stellt einen weißen Fleck in dieser Frage dar. Anhand des Chronotopos-Konzepts von Michail Bachtin werden in dieser Arbeit daher zeitliche und räumliche Tiefenstrukturen in der Darstellung Ostdeutschlands in den Werken Jan Böttchers und Andreas Maiers herausgearbeitet und mit ihrer Darstellung Westdeutschlands verglichen. Neben grundsätzlichen Unterschieden fallen dabei signifikante Übereinstimmungen auf.
Der internationale Standard CityGML ist zu einer zentralen Schnittstelle für die geometrische wie semantische Beschreibung von 3D-Stadtmodellen geworden. Das Institut für Geodäsie und Geoinformationstechnik (IGG) der Technischen Universität Berlin leistet mit ihren Entwicklung der 3D City Database und der Importer/Exporter Software einen entscheidenden Beitrag die Komplexität von CityGML-Daten in einer Geodatenbank intuitiv und effizient nutzen zu können. Die Software des IGG ist Open Source, unterstützte mit Oracle Spatial (ab Version 10g) aber bisher nur ein proprietäres Datenbank Management System (DBMS). Im Rahmen dieser Masterarbeit wurde eine Portierung auf die freie Datenbank-Software PostgreSQL/PostGIS vorgenommen und mit der Performanz der Oracle-Version verglichen. PostGIS gilt als eine der ausgereiftesten Geodatenbanken und wurde in diesem Jahr mit dem Release der Version 2.0 nochmals um zahlreiche Funktionen und Features (u.a. auch 3D-Unterstützung) erweitert. Die Ergebnisse des Vergleiches sowie die umfangreiche Gegenüberstellung aller verwendeten Konzepte (SQL, PL, Java) geben Aufschluss auf die Charakteristika beider räumlicher DBMS und ermöglichen einen Erkenntnisgewinn über die Projektgrenzen hinaus.
This study investigates the reform of the public budgeting and accounting system (Doppik) in Brandenburg. On the one hand, this thesis aims to identify the key variables shaping employees’ commitment to change and, on the other hand, to examine the extent employees’ commitment to change influences the implementation process of the reform. The results of this study show that the commitment of civil servants towards the Doppik is primarily determined by the content, but also by the context of the reform. Moreover, it is revealed for the case of Brandenburg that civil servants’ affective commitment to change has a significant positive influence on the perceived success of the reform implementation. The results of the study are not only of high scientific importance, but also of practical relevance. The recommendations developed in this study offer grounded guidelines on how to successfully implement the Doppik on local level in Brandenburg.
Complex network theory provides an elegant and powerful framework to statistically investigate the topology of local and long range dynamical interrelationships, i.e., teleconnections, in the climate system. Employing a refined methodology relying on linear and nonlinear measures of time series analysis, the intricate correlation structure within a multivariate climatological data set is cast into network form. Within this graph theoretical framework, vertices are identified with grid points taken from the data set representing a region on the the Earth's surface, and edges correspond to strong statistical interrelationships between the dynamics on pairs of grid points. The resulting climate networks are neither perfectly regular nor completely random, but display the intriguing and nontrivial characteristics of complexity commonly found in real world networks such as the internet, citation and acquaintance networks, food webs and cortical networks in the mammalian brain. Among other interesting properties, climate networks exhibit the "small-world" effect and possess a broad degree distribution with dominating super-nodes as well as a pronounced community structure. We have performed an extensive and detailed graph theoretical analysis of climate networks on the global topological scale focussing on the flow and centrality measure betweenness which is locally defined at each vertex, but includes global topological information by relying on the distribution of shortest paths between all pairs of vertices in the network. The betweenness centrality field reveals a rich internal structure in complex climate networks constructed from reanalysis and atmosphere-ocean coupled general circulation model (AOGCM) surface air temperature data. Our novel approach uncovers an elaborately woven meta-network of highly localized channels of strong dynamical information flow, that we relate to global surface ocean currents and dub the backbone of the climate network in analogy to the homonymous data highways of the internet. This finding points to a major role of the oceanic surface circulation in coupling and stabilizing the global temperature field in the long term mean (140 years for the model run and 60 years for reanalysis data). Carefully comparing the backbone structures detected in climate networks constructed using linear Pearson correlation and nonlinear mutual information, we argue that the high sensitivity of betweenness with respect to small changes in network structure may allow to detect the footprints of strongly nonlinear physical interactions in the climate system. The results presented in this thesis are thoroughly founded and substantiated using a hierarchy of statistical significance tests on the level of time series and networks, i.e., by tests based on time series surrogates as well as network surrogates. This is particularly relevant when working with real world data. Specifically, we developed new types of network surrogates to include the additional constraints imposed by the spatial embedding of vertices in a climate network. Our methodology is of potential interest for a broad audience within the physics community and various applied fields, because it is universal in the sense of being valid for any spatially extended dynamical system. It can help to understand the localized flow of dynamical information in any such system by combining multivariate time series analysis, a complex network approach and the information flow measure betweenness centrality. Possible fields of application include fluid dynamics (turbulence), plasma physics and biological physics (population models, neural networks, cell models). Furthermore, the climate network approach is equally relevant for experimental data as well as model simulations and hence introduces a novel perspective on model evaluation and data driven model building. Our work is timely in the context of the current debate on climate change within the scientific community, since it allows to assess from a new perspective the regional vulnerability and stability of the climate system while relying on global and not only on regional knowledge. The methodology developed in this thesis hence has the potential to substantially contribute to the understanding of the local effect of extreme events and tipping points in the earth system within a holistic global framework.
Gender-inclusive language has evolved into a much-debated topic during the past years, discussed interdisciplinarily from theoretical to psycholinguistics, sociology, and economy – and by anyone who uses language.
Studies on German that primarily relied on questionnaires (reviewed in Braun et al. 2005), cloze tests (Klein 1988), and categorisation tasks with picture matching (Irmen & Köhncke 1996) disqualify the generically used masculine forms as pseudo-generic – failing their grammatically prescribed function to include referents of any Gender. Gender-balanced expressions (pair and split forms like Lehrer und Lehrerinnen) make explicit reference to female presence and participation, and thus elevate a more equitable interpretation.
Online methods to investigate the processing of Gender-sensitive language are surprisingly rare among research on the phenomenon, except for reaction time measures (Irmen & Köhncke 1996, Irmen & Kaczmarek 2000) and eye-tracking in reading (Irmen & Schumann 2011).
In addition, Gender-neutral language (GNL) has not been focused on in the majority of experiments, and when it was among the stimuli, results were inconclusive (De Backer & De Cuypere 2012) or found such alternatives to be ineffective (resembling masculine generics, Braun et al. 2005), despite the fact that guidelines on non-discriminatory language use commonly recommend these.
Gender-neutral (GN) expressions for personal reference in German include
• nominalised participles; nominalisations in general: Interessierte, Lehrende
• collective singulars: Publikum, Kollegium
• compounds (e.g., with a notion of “-person”): Ansprechpersonen, Lehrkräfte
• paraphrases that background a (gendered) subject: e.g., passives, relatives
In a visual world eye-tracking study, the comprehension of plural generics using masculine nouns and GN forms was tested for roles and occupations.
In complex stimulus scenarios, reference had to be established to referent images presented on a screen. At the end of each item, a question was asked in order to (re)identify the image that matched the referents of the respective setting best. Images depicted 1) a single person (protagonist), 2) an all-female group, 3) an all-male group, 4) a mixed Gender group of female and male members. The group referents were introduced with either a) masculine nouns (die Lehrer), b) female-specific feminine nouns (die Lehrerinnen), or c) one of the upper three nominal GN variants (die Lehrkräfte).
Results confirm the frequent male bias in masculine forms that are used as generics, that is, their male-specific interpretation. Furthermore, stereotypicality of nouns had an impact on responses. The GN alternatives, which are generally known to aim for indefinite reference (“marked” for Gender-fair language) were found to be most qualified to elicit mixed Gender group interpretations. When reference was established with GN terms, an inclusive response was consistently elicited. This was both indicated by eye movements and response proportions, but to a different extent depending on the particular GN noun type. Concepts that abstract from Gender in their linguistic forms (“neutralising” it) appear to be more inclusive, and thus better candidates for generic reference than masculines.
Diese Arbeit befasst sich mit der Entwicklung einer Applikation, welche Infrastrukturdaten über Eisenbahnnetze generiert. Dabei bildet die Erzeugung der topologischen Informationen den Schwerpunkt dieser Arbeit. Der Anwender charakterisiert hierfür vorab das gewünschte Eisenbahnnetz, wobei die geforderten Eigenschaften die Randbedingungen darstellen, die bei der Synthese zu beachten sind. Zur Einhaltung dieser Bedingungen wird die Constraint-Programmierung eingesetzt, welche durch ihr spezielles Programmierparadigma konsistente Lösungen effizient erzeugt. Dies wird u.a. durch die Nachnutzung so genannter globaler Constraints erreicht. Aus diesem Grund wird insbesondere auf den Einsatz der Constraint-Programmierung bei der Modellierung und Implementierung der Applikation eingegangen.
The present thesis looks at cultural conceptualisations in relation to DEATH in Irish English from a Cultural Linguistic perspective and puts a special focus on the diachronic development of these conceptualisations. For the study, a corpus consisting of 1,400 death notices from the Dublin-based national newspaper The Irish Times from 14 historical periods between 1859 and 2023 was compiled, resulting in a highly specialised 70,000-word corpus. First, the manual qualitative analysis of the death notices produced evidence for eight superordinate cultural conceptualisations surrounding DEATH, namely, in the order of their frequency THE DEAD ARE TO BE REMEMBERED OR REGRETTED, DEATH IS SOMETHING POSITIVE, DEATH IS REST, DEATH IS A JOURNEY, DYING IS THE BEGINNING OF ANOTHER LIFE, DEATH IS (NOT) A TABOO, DEATH IS GOD’S WILL, and DEATH IS THE END. These conceptualisations were derived from linguistic expressions in the death notices that have these conceptualisations as a cognitive basis. Second, the quantitative comparison of the individual conceptualisations detected diachronic variation, which is interconnected with historical and social developments in Ireland. The thesis, therefore, illustrates the applicability of Cultural Linguistics as an adequate method for diachronic studies interested in culturally determined developments of conceptualisations.