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Schülerfirmen haben im Bereich Arbeitslehre in jüngster Zeit an Bedeutung gewonnen. Die Autoren stellen im Basisartikel des vorliegenden Heftes Lernen. Gewinn verschiedene Formen von Schülerfirmen vor und erläutern Probleme bei der Sicherung der Lernqualität. Diese beziehen sich einerseits auf die optimale Förderung arbeitsrelevanter Basiskompetenzen der Schüler und andererseits auf das Erreichen der curricularen Ziele der Arbeitslehre, insbesondere hinsichtlich der technischen und ökonomischen Bildung sowie der Berufsorientierung. Zur Optimierung sind Lehrplankorrekturen, weitere Erfahrungen mit Schülerfirmen und die Unterstützung der Fachdidaktik notwendig. Wichtig sind zudem eine kollegiale Kooperation und Vernetzung an den Lernorten. Die Verfasser führen darüber hinaus in die Beiträge des vorliegenden Heftes ein.
In der vorliegenden Arbeit analysiert Maciej Chinalski den Regional Governance Ansatz und seine praktische Umsetzung in den Europäischen Grenzregionen zwischen Deutschland und Polen (Oder-Partnerschaft) sowie im Vierländereck von Österreich, Ungarn, Tschechien und Slowakei (Centrope-Region). Regional Governance gilt als eine Kooperationsform unterschiedlicher regionaler Akteure, die nach neuen Synergien suchen, um ihre Zusammenarbeit voranzutreiben. Eine Region wird dabei als Raum verstärkter Interaktionen zwischen Staat, Zivilgesellschaft und Wirtschaft verstanden.
Flood hazard estimations are conducted with a variety of methods. These include flood frequency analysis (FFA), hydrologic and hydraulic modelling, probable maximum discharges as well as climate scenarios. However, most of these methods assume stationarity of the used time series, i.e., the series must not exhibit trends. Against the background of climate change and proven significant trends in atmospheric circulation patterns, it is questionable whether these changes are also reflected in the discharge data. The aim of this PhD thesis is therefore to clarify, in a spatially-explicit manner, whether the available discharge data derived from selected German catchments exhibit trends. Concerning the flood hazard, the suitability of the currently used stationary FFA approaches is evaluated for the discharge data. Moreover, dynamics in atmospheric circulation patterns are studied and the link between trends in these patterns and discharges is investigated. To tackle this research topic, a number of different analyses are conducted. The first part of the PhD thesis comprises the study and trend test of 145 discharge series from catchments, which cover most of Germany for the period 1951–2002. The seasonality and trend pattern of eight flood indicators, such as maximum series and peak-over-threshold series, are analyzed in a spatially-explicit manner. Analyses are performed on different spatial scales: at the local scale, through gauge-specific analyses, and on the catchment-wide and basin scales. Besides the analysis of discharge series, data on atmospheric circulation patterns (CP) are an important source of information, upon which conclusions about the flood hazard can be drawn. The analyses of these circulation patterns (after Hess und Brezowsky) and the study of the link to peak discharges form the second part of the thesis. For this, daily data on the dominant CP across Europe are studied; these are represented by different indicators, which are tested for trend. Moreover, analyses are performed to extract flood triggering circulation patterns and to estimate the flood potential of CPs. Correlations between discharge series and CP indicators are calculated to assess a possible link between them. For this research topic, data from 122 meso-scale catchments in the period 1951–2002 are used. In a third part, the Mulde catchment, a mesoscale sub-catchment of the Elbe basin, is studied in more detail. Fifteen discharge series of different lengths in the period 1910–2002 are available for the seasonally differentiated analysis of the flood potential of CPs and flood influencing landscape parameters. For trend tests of discharge and CP data, different methods are used. The Mann-Kendall test is applied with a significance level of 10%, ensuring statistically sound results. Besides the test of the entire series for trend, multiple time-varying trend tests are performed with the help of a resampling approach in order to better differentiate short-term fluctuations from long-lasting trends. Calculations of the field significance complement the flood hazard assessment for the studied regions. The present thesis shows that the flood hazard is indeed significantly increasing for selected regions in Germany during the winter season. Especially affected are the middle mountain ranges in Central Germany. This increase of the flood hazard is attributed to a longer persistence of selected CPs during winter. Increasing trends in summer floods are found in the Rhine and Danube catchments, decreasing trends in the Elbe and Weser catchments. Finally, a significant trend towards a reduced diversity of CPs is found causing fewer patterns with longer persistence to dominate the weather over Europe. The detailed study of the Mulde catchment reveals a flood regime with frequent low winter floods and fewer summer floods, which bear, however, the potential of becoming extreme. Based on the results, the use of instationary approaches for flood hazard estimation is recommended in order to account for the detected trends in many of the series. Through this methodology it is possible to directly consider temporal changes in flood series, which in turn reduces the possibility of large under- or overestimations of the extreme discharges, respectively.
This work analyzes the saving and consumption behavior of agents faced with the possibility of unemployment in a dynamic and stochastic life cycle model. The intertemporal optimization is based on Dynamic Programming with a backward recursion algorithm. The implemented uncertainty is not based on income shocks as it is done in traditional life cycle models but uses Markov probabilities where the probability for the next employment status of the agent depends on the current status. The utility function used is a CRRA function (constant relative risk aversion), combined with a CES function (constant elasticity of substitution) and has several consumption goods, a subsistence level, money and a bequest function.
Anfang des Jahres 2008 erkannte die Bundesrepublik Deutschland den Kosovo als souveränen Staat an, während sich die Europäische Union mit dieser Entscheidung zurückhielt. Die Politikwissenschaftlerin Franziska Krämer untersucht in ihrer Arbeit „Die Politik Deutschlands in der Kosovofrage“ das Spannungsverhältnis zwischen eigenständiger deutscher und europäischer Außenpolitik. Am Beispiel des Kosovo wird die Problematik der Verflechtung von deutschen und europäischen Politikebenen diskutiert. Die Autorin kommt zu dem Ergebnis, dass die deutsche Kosovopolitik als Beispiel einer neuen deutschen Außenpolitik und nicht als der Beginn einer Europäisierung deutscher Außenpolitik zu sehen ist.